Ship hull form of the underwater area strongly influences the resistance of the ship. The major factor in ship resistance is skin friction resistance. Bulbous bows, polymer paint, water repellent paint （highly water-...Ship hull form of the underwater area strongly influences the resistance of the ship. The major factor in ship resistance is skin friction resistance. Bulbous bows, polymer paint, water repellent paint （highly water-repellent wall）, air injection, and specific roughness have been used by researchers as an attempt to obtain the resistance reduction and operation efficiency of ships. Micro-bubble injection is a promising technique for lowering frictional resistance. The injected air bubbles are supposed to somehow modify the energy inside the turbulent boundary layer and thereby lower the skin friction. The purpose of this study was to identify the effect of injected micro bubbles on a navy fast patrol boat （FPB） 57 m type model with the following main dimensions： L=2 450 ram, B=400 mm, and T=190 mm. The influence of the location of micro bubble injection and bubble velocity was also investigated. The ship model was pulled by an electric motor whose speed could be varied and adjusted. The ship model resistance was precisely measured by a load cell transducer. Comparison of ship resistance with and without micro-bubble injection was shown on a graph as a function of the drag coefficient and Froude number. It was shown that micro bubble injection behind the mid-ship is the best location to achieve the most effective drag reduction, and the drag reduction caused by the micro-bubbles can reach 6%-9%.展开更多
AIM:To investigate the correlation between the Helicobacter pylori(H.pylori)infection and host genetic background of healthy populations in Indonesia.METHODS:In March 2007,epidemiological studies were undertaken on th...AIM:To investigate the correlation between the Helicobacter pylori(H.pylori)infection and host genetic background of healthy populations in Indonesia.METHODS:In March 2007,epidemiological studies were undertaken on the general population of a city in Indonesia(Mataram,Lombok).The participants included 107 men and 187 women,whose ages ranged from6 to 74 years old,with an average age of 34.0(±14.4)(±SD).The H.pylori of subject by UBT method determination,and through the polymerase chain reaction with confronting two-pair primers(PCR-CTPP)method parsing the single nucleotide polymorphism of interleukin(IL)-8,IL-4,IL-1β,CD14,tumor necrosis factor(TNF-a)and tyrosine-protein phosphates non-receptor type 11(PTPN11)genotypes.The experimental data were analyzed by the statistical software SAS.RESULTS:The H.pylori infection rates in the healthy Indonesian population studied were 8.4%for men and12.8%for women;no obvious differences were noted for H.pylori infection rates by sex or age.TC genotypes of IL-4,TC and CC genotypes of TNF-a,and GA genotypes of PTPN11,were higher in frequency.Both CC and TC genotype of TNF-a T-1031C loci featured higher expressions in the healthy Indonesian population Indonesia studied of(OR=1.99;95%CI:0.67-5.89)and(OR=1.66;95%CI:0.73-3.76),respectively.C allele of IL-1βT-31C gene locus was at a higher risk(OR=1.11;95%CI:0.70-1.73)of H.pylori infection,but no statistical significance was found in our study.CONCLUSION:We reveal that the association between the TNF-a and IL-1βgenotypes may be the susceptibility of H.pylori in the studied population.展开更多
The application of multi-hull ship or trimaran vessel as a mode of transports in both river and sea environments have grown rapidly in recent years.Trimaran vessels are currently of interest for many new high speed sh...The application of multi-hull ship or trimaran vessel as a mode of transports in both river and sea environments have grown rapidly in recent years.Trimaran vessels are currently of interest for many new high speed ship projects due to the high levels of hydrodynamic efficiency that can be achieved,compared to the mono-hull and catamaran hull forms.The purpose of this study is to identify the possible effects of using an unsymmetrical trimaran ship model with configuration（S/L） 0.1-0.3 and R/L=0.1-0.2.Unsymmetrical trimaran ship model with main dimensions： L=2000mm,B=200 mm and T=45 mm.Experimental methods（towing tank） were performed in the study using speed variations at Froude number 0.1-0.6.The ship model was pulled by an electric motor whose speed could be varied and adjusted.The ship model resistance was measured precisely by using a load cell transducer.The comparison of ship resistance for each configuration with mono-hull was shown on the graph as a function of the total resistance coefficient and Froude number.The test results found that the effective drag reduction could be achieved up to 17% at Fr=0.35 with configuration S/L=0.1.展开更多
The authors make the analysis of first arrivals of the P-wave from Ina-TEWS （Indonesian tsunami early warning system） and CTBT （comprehensive nuclear-test-band treaty） stations. These are used for earthquake early...The authors make the analysis of first arrivals of the P-wave from Ina-TEWS （Indonesian tsunami early warning system） and CTBT （comprehensive nuclear-test-band treaty） stations. These are used for earthquake early warning, magnitude determination and potential earthquake hazard mitigation based on seismogram acceleration. This research is focused on the study of energy duration of high frequency, and the maximum displacement of P-waves by observing broadband seismograms. The further analysis consists of deconvolution, integration or defferentiation, recursive filtering for data restitution, and applying a Butterworth filter of second order. The Butterworth filter uses high frequency 0.075 Hz to cut the effect of drift, and band-pass frequency 2-4 Hz for use in magnitude calculation. The authors choose potentially damaging earthquakes to be greater than Mw 〉 6.0. Based on the trigger on the three seconds the first arrival P-wave, the dominant period （Td） and amplitude displacement （Pd） was calculated by using data CISI （Indonesian CI Sompet） seismological station, Garut （west Java） and tested for data CTBT, LEM bang, Bandung （LEM station）. This research resulted determination of the P-wave arrival time accurately using integrated skewness and kurtosis. Performance data from the CTBT stations is very high. Signal to noise ratio 〉1,000 after passing through the filter. Such riset conducted to find out a rapid magnitude estimations from predominant frequency of displacement are： log Td = 0.2406 M- 1.3665 （R = 0.73） or M = 4.156 log Td ＋ 5.6797. Relationship of Pd, magnitude moment, Mw and hypocentre, R are log Pd = -4.684 ＋ 0.815 Mw - 1.36 log R. For relation of PGA （peak ground acceleration） and amplitude displacement are log PGA = 1.117 log Pd ＋ 0.728 （R = 0.91）. Furthermore, this formula can be used to support earthquake early warning in west of Java.展开更多
Background:Several vaccines have been approved against COVID-19,and 5 have been used in Indonesia.Due to the decrease in antibody levels 3 to 6 months after the second dose of CoronaVac,healthcare workers received the...Background:Several vaccines have been approved against COVID-19,and 5 have been used in Indonesia.Due to the decrease in antibody levels 3 to 6 months after the second dose of CoronaVac,healthcare workers received the third booster of mRNA vaccine(mRNA-1273)to increase the antibody level.This study aimed to evaluate the risk factors of anti-S-RBD IgG levels differences in healthcare workers.Methods:This study is a retrospective cohort study of 576 healthcare workers without previous SARS-CoV-2 infection who received 2 doses of CoronaVac and the third dose of mRNA-12736 months after the second dose.Blood samples were obtained 2nd,6th,12th,and 24th weeks after the second dose of CoronaVac vaccine administration,with mRNA-1273 booster on week 20.Quantitative measurements of IgG antibodies were performed with Elecsys Anti-SARS-CoV-2 S immunoassay.We identify the baseline factors predicting post-vaccination antibody titers using univariate and multivariate linear regression analysis.Results:This study comprised 576 participants aged 32 years old,72.05%female,and 45.84%from high-risk occupation subgroups.The median antibodies titer level on the 2nd,6th,12th,and 24th weeks after the second vaccine dose administration were 40.99 u/mL,42.01 u/mL,54.78 u/mL,and 23,225 u/mL.Antibody levels trended highest in female and younger age group(20-29 years old).Conclusions:The third dose of vaccine increased the quantitative SARS-CoV-2 spike IgG antibody titers and eliminated differences in antibodies titer by gender.展开更多
This study investigates the relation between the Coulomb failure stress of the mainshock with the aftershocks sequence following the 2018 Palu-Donggala earthquake in Indonesia.We calculate the Coulomb failure stress u...This study investigates the relation between the Coulomb failure stress of the mainshock with the aftershocks sequence following the 2018 Palu-Donggala earthquake in Indonesia.We calculate the Coulomb failure stress using the available coseismic fault models,which had varied moment magnitudes between M_W7.53~M_W7.62.Different interpretations of the fault sources were suggested by previous studies.While two fault models suggested that one inland fault segment ruptured during the earthquake,another fault model proposed that two fault segments ruptured inland of Central Sulawesi and along the coast of Palu bay.We further overlay the positive and negative values of Coulomb failure stress with the reported relocated aftershock.We find that only by conducting Coulomb failure stress analysis,we can not favour the preference of the coseismic fault which explains aftershock distribution.This investigation demonstrates that additional observational data from geological field surveys are required to identify the surface rupture in comparison with the coseismic fault model.展开更多
Objective:To assess the prevalence of Mycobacterium(M.)tuberculosis infection and its associated risks in children under fifteen years of age.Methods:Based on secondary data from the 2018 Indonesian Basic Health Surve...Objective:To assess the prevalence of Mycobacterium(M.)tuberculosis infection and its associated risks in children under fifteen years of age.Methods:Based on secondary data from the 2018 Indonesian Basic Health Survey(RISKESDAS 2018),this cross-sectional study employed M.tuberculosis infection in children as a dependent variable and age level,sex,region,location,family case positive,and smoking as independent variables.Geospatial analysis was applied to show the prevalence of M.tuberculosis infection and multivariate regression was performed to analyze the risk factors of getting the infection among children under 15 years of age.Results:Prevalence ranges of M.tuberculosis infection among children aged 0-14 years,babies(age<12 months),toddlers(age 12-59 months),and children aged between 5 and 14 years were 0.03%to 0.57%,0%to 0.64%,0%to 0.78%,and 0.01%to 0.53%,respectively in Indonesia.A high prevalence of M.tuberculosis infection among children under 15 years of age was found in Papua and other provinces,such as Kalimantan and Java.Contacting with tuberculosis family members was positively associated with M.tuberculosis infection in children as shown by multivariate logistic regression(OR 8.94;95%CI 5.4-14.6,P<0.05).Conclusions:Contacting with family member who has tuberculosis is related with M.tuberculosis infection among children in Indonesia.Therefore,screening the household for contact with tuberculosis patients is a preventive treatment for children.展开更多
The objective of the presented study is to perform a vibration analysis and investigate the stability of a viscoelastic-fluid conveying pipe with an intermediate support.The mathematical model is elaborated in the fra...The objective of the presented study is to perform a vibration analysis and investigate the stability of a viscoelastic-fluid conveying pipe with an intermediate support.The mathematical model is elaborated in the framework of the Euler-Bernoulli beam theory in combination with the Kelvin-Voight viscoelastic approach.The resulting differential equation of motion and the related boundary conditions and compatibility conditions in the mid-span support are solved analytically using a power series method.The results show that an intermediate support located atξ_(s)=0.1 andξ_(s)=0.5 increases the critical velocity up to 35%and 50.15%,respectively.Also,the non-dimensional critical velocity for an intermediate support atξ_(s)=0.1 is 4.83.展开更多
Multihull ships are widely used for sea transportation, and those with four hulls are known as quadramarans. Hull position configurations of a quadramaran include the diamond, tetra, and slice. In general, multihull v...Multihull ships are widely used for sea transportation, and those with four hulls are known as quadramarans. Hull position configurations of a quadramaran include the diamond, tetra, and slice. In general, multihull vessels traveling at high speeds have better hydrodynamic efficiency than monohull ships. This study aims to identify possible effects of various quadramaran hull position configurations on ship resistance for hull dimensions of 2 m length, 0.21 m breadth, and 0.045 m thickness. We conducted a towing test in which we varied the hull spacing and speed at Fr values between 0.08 and 0.62 and measured the total resistance using a load cell transducer. The experimental results reveal that the lowest total resistance was achieved with a diamond quadramaran configuration at Fr = 0.1-0.6 and an effective interference factor of up to 0.35 with S/L = 3/10 and R/L = 1/2 at Fr = 0.62.展开更多
In the present analysis, several parameters used in a numerical simulation are investigated in an integrated study to obtain their influence on the process and results of this simulation. The parameters studied are el...In the present analysis, several parameters used in a numerical simulation are investigated in an integrated study to obtain their influence on the process and results of this simulation. The parameters studied are element formulation, friction coefficient, and material model. Numerical simulations using the non-linear finite element method are conducted to produce virtual experimental data for several collision scenarios. Pattern and size damages caused by collision in a real accident case are assumed as real experimental data, and these are used to validate the method. The element model study performed indicates that the Belytschko-Tsay element formulation should be recommended for use in virtual experiments. It is recommended that the real value of the friction coefficient for materials involved is applied in simulations. For the study of the material model, the application of materials with high yield strength is recommended for use in the side hull structure.展开更多
Objective:First-line nurse managers are more likely to work according to gender beliefs and stereotypes,which may affect their managerial competence.This study is aimed at comparing managerial competence of male and f...Objective:First-line nurse managers are more likely to work according to gender beliefs and stereotypes,which may affect their managerial competence.This study is aimed at comparing managerial competence of male and female first-line nurse managers in public hospitals in Indonesia.Methods:This study employed a descriptive comparative approach with a cross-sectional survey with a total of 256 participants selected from 18 public hospitals.To measure managerial competence,the managerial competence scale for Indonesian first-line nurse managers was used.Data were analyzed using descriptive analyses using mean,standard deviation,and Independent t-test.Results:Managerial competence of male and female first-line nurse managers was not significantly different(P=0.555).Female nurse managers descriptively reported/received higher ranking in facilitating spiritual nursing care,managing self,staffing and professional development,utilizing informatics,and applying quality care improvement.Male nurse managers repor ted higher in leadership and financial management.Conclusions:Female and male first-line nurse managers should be treated equally for leadership and managerial development.展开更多
BACKGROUND Brain arteriovenous malformations(bAVMs)remains one of the most prevalent causes of intracranial hemorrhage and stroke-like syndromes in the young adult population.Although it has been agreed upon that defi...BACKGROUND Brain arteriovenous malformations(bAVMs)remains one of the most prevalent causes of intracranial hemorrhage and stroke-like syndromes in the young adult population.Although it has been agreed upon that definitive treatment using either single or multi-modal approach is warranted for successful bAVM management,much debate still revolves regarding the optimal timing of definitive treatment.CASE SUMMARY In this report,we present a case of delayed,definitive endovascular treatment for ruptured bAVM in a 21-year-old female,3 mo post-ictus.The bAVM,with a left pericallosal feeding artery and cortical draining veins,was successfully obliterated through embolization using the Onyx 18.On follow-up the patient has recommenced her daily activities and experiences only mild occasional headaches with mild motor deficits.The report leads to our review on an important issue regarding the optimal timing of ruptured bAVM definitive management and bring forward the current evidence available on delayed vs immediate definitive bAVM intervention.We also highlight current issues that need to be addressed for clearer guidelines on definitive therapy initiation.CONCLUSION Current treatment paradigms of ruptured bAVM remains elusive,with substantial heterogeneity in the current literature.A consensus on the definition of“acute”vs“delayed”,management goal,follow-up length and outcome parameters are required to support formation of a clear paradigm.展开更多
Nowadays, consumers are demanding for minimally processed, additive-free, high quality, fresh-like andmicrobiologically safe foods. However, as food deterioration is the constant threat along the entire food chain, fo...Nowadays, consumers are demanding for minimally processed, additive-free, high quality, fresh-like andmicrobiologically safe foods. However, as food deterioration is the constant threat along the entire food chain, food preservationremains as necessary today as in the past. In this paper, several citrus essential oils, including sweet orange, lemon and lime essentialoil applied directly in fresh orange juice as a natural preservative, were analyzed for their antimicrobial activity. The antimicrobialactivity of each citrus essential oil was assessed against Saccharomyces cerevisiae, Lactobacillus plantarum and Aspergillus nigerusing broth macrodilution. Among all citrus essential oils tested, sweet orange essential oil with 0.10% concentration showedsignificant antimicrobial activity against microorganisms tested. Hence, it was chosen to be applied in the fresh orange juice. Then,shelf life analysis was conducted during 7 d of storage at 5 ℃ and during 2 d of storage at 25 ℃ using selected concentration of theselected citrus essential oil in the fresh orange juice. Based on the results obtained, the addition of sweet orange essential oil with0.10% concentration was not able to prolong the shelf life of the fresh orange juice according to the Indonesian National Standard（SNI）. However, the formulation of fresh orange juice itself was able to improve its shelf life when compared to the shelf life of thecommercial orange juice.展开更多
Background： Hypertension is one of the signficant risk factors for further severe cardiovascular diseases. Furthermore, the insidence of hypertension in adult age population has increased gradually. Thus, assessment ...Background： Hypertension is one of the signficant risk factors for further severe cardiovascular diseases. Furthermore, the insidence of hypertension in adult age population has increased gradually. Thus, assessment of hypertension insidence and their risk factors in adult age people has given the beneficience for treating dan preventing program earlier. Aim： To analyze hypertension insidence in adult age and their risk factors that dominanly effect the occurance of hypertension. Method： This study was correlational with survey method. Accidental sampling was conducted to 120 respondents who live around Malioboro district. Hypertension was detected from systole and diastole value, while the risk factors of hypertension were age, gender, family disease history, type of activity, the number of cigarette each day, the length of smoking, random blood glucose, and body mass index. Analyzing the data used Pearson correlation if data were normal, or used Spearman correlation if data were not normal. Findings： From 120 participants, mean of systolic pressure was 120.7 mmHg and mean of diastolic pressure was 78.5 mmHg. Age mean was 39 years old, dominantly was woman amount 83 （69.2%）, and without family disease history as 66 （55%）. Mostly they had moderate physical activity amount 71 （59%）. Mean of cigarette consumtion was 11 pieces/day, for 23 years. Random blood glucose mean was 131 mg/dL and mean of body mass index was 26 kg/m2. Correlation analysis mentioned that body mass index had correlate with systolic and diastolic value significantly （p 〈 0.05）. Conclusion： Systolic and diastolic pressure value in adult age were still normal. Risk factor that correlated significantly with adult age blood pressure was body mass index. Another risk factors such as cholesterol level, blood glucose in fasting condition and two hour post meal, also food consumtion were considered that should be included in next study.展开更多
Objective: There is no single study that has examined nursing research priorities in Vietnam. This study aimed to gain consensus from experts on the nursing research priorities in Vietnam.Methods: A three-round modifi...Objective: There is no single study that has examined nursing research priorities in Vietnam. This study aimed to gain consensus from experts on the nursing research priorities in Vietnam.Methods: A three-round modified Delphi study was used in this study. A focus group discussion among experts was conducted in round I to identify the nursing research priorities(n=23). Data in round I were analyzed using content analysis. In round Ⅱ, participants were invited to rate the importance of each nursing priority topic in a 5-point Likert scale questionnaire, which had a 74%(n=17) response rate. In round Ⅲ, the questionnaire was returned to the experts(n=17) until consensus was reached. Data from round Ⅱ and round Ⅲ were analyzed to produce mean score and final rank.Results: The top 12 research priority lists were identified, which included subthemes and areas of possible investigations. All priorities were classified into three groups in the rank order, namely:(i) nursing management and leadership, which included(1) nursing care quality,(2) management and leadership of nurse managers,(3) nursing image,(4) professional nurse competency, and(5) human resource management;(ii) nursing education, which included(1) knowledge-specific domain,(2) the linkage between education and practice, and(3) nurse teacher workforce;and(iii) nursing service, which included(1) adult nursing concern,(2) patient safety,(3) public health nursing concern, and(4) quality of life of patients and nurses.Conclusions: Consensus among experts was achiever, and the findings are considered as the basis of resources to the most essential research needs in Vietnam.展开更多
AIM:To investigate the changes in levels of the lactate dehydrogenase(LDH)enzyme in corneal edema after cataract surgery with trans-corneal oxygenation therapy.METHODS:This pre-post design study design conducted on 15...AIM:To investigate the changes in levels of the lactate dehydrogenase(LDH)enzyme in corneal edema after cataract surgery with trans-corneal oxygenation therapy.METHODS:This pre-post design study design conducted on 15 patients with corneal edema after cataract surgery and receiving trans-corneal oxygenation therapy.Tear sample(using Schirmer paper,from the inferior fornix of the conjunctiva)was carried out prior to trans-corneal oxygenation therapy,on the day 2(D2)and day 5(D5)postoperatively before and after trans-corneal oxygenation therapy.Visual acuity[VA(Log MAR)],corneal endothelial density,central corneal thickness(CCT),and coefficient of variation corneal endothelial(Co V)were recorded.The value of LDH was measured using ELISA.The difference in mean LDH value before and after trans-corneal oxygenation therapy,between two groups were analyzed using Wilcoxon signed rank test.RESULTS:There was a decrease in LDH tear concentration at D2(pre vs post:1127.54±497.09 vs 696.91±489.49;P=0.002)and D5(pre vs post:1064.17±677.77 vs 780.28±428.95;P=0.027)after trans-corneal oxygenation therapy as well as decrease in LDH concentration on the D2 compared to D5(P=0.041).The mean CCT was decreased significantly after the administration of trans-corneal oxygenation(pre vs post:632.10±25.66 vs 563.90±51.54;P=0.005).The mean VA and Co V increased significantly after the administration of trans-corneal oxygenation(P=0.001 and P=0.028,respectively).However,there was no difference in mean of corneal endothelial density(P=0.814).CONCLUSION:Trans-corneal oxygenation therapy is associated with significant decrease of tears LDH levels in post cataract surgery with corneal edema.It is accompanied by clinical improvement such as significant reduction of CCT.展开更多
基金Supported by the Directorate for Research and Community Service,University of Indonesia(RUUI Research Laboratory 2010),Jakarta,Indonesia
文摘Ship hull form of the underwater area strongly influences the resistance of the ship. The major factor in ship resistance is skin friction resistance. Bulbous bows, polymer paint, water repellent paint （highly water-repellent wall）, air injection, and specific roughness have been used by researchers as an attempt to obtain the resistance reduction and operation efficiency of ships. Micro-bubble injection is a promising technique for lowering frictional resistance. The injected air bubbles are supposed to somehow modify the energy inside the turbulent boundary layer and thereby lower the skin friction. The purpose of this study was to identify the effect of injected micro bubbles on a navy fast patrol boat （FPB） 57 m type model with the following main dimensions： L=2 450 ram, B=400 mm, and T=190 mm. The influence of the location of micro bubble injection and bubble velocity was also investigated. The ship model was pulled by an electric motor whose speed could be varied and adjusted. The ship model resistance was precisely measured by a load cell transducer. Comparison of ship resistance with and without micro-bubble injection was shown on a graph as a function of the drag coefficient and Froude number. It was shown that micro bubble injection behind the mid-ship is the best location to achieve the most effective drag reduction, and the drag reduction caused by the micro-bubbles can reach 6%-9%.
文摘AIM:To investigate the correlation between the Helicobacter pylori(H.pylori)infection and host genetic background of healthy populations in Indonesia.METHODS:In March 2007,epidemiological studies were undertaken on the general population of a city in Indonesia(Mataram,Lombok).The participants included 107 men and 187 women,whose ages ranged from6 to 74 years old,with an average age of 34.0(±14.4)(±SD).The H.pylori of subject by UBT method determination,and through the polymerase chain reaction with confronting two-pair primers(PCR-CTPP)method parsing the single nucleotide polymorphism of interleukin(IL)-8,IL-4,IL-1β,CD14,tumor necrosis factor(TNF-a)and tyrosine-protein phosphates non-receptor type 11(PTPN11)genotypes.The experimental data were analyzed by the statistical software SAS.RESULTS:The H.pylori infection rates in the healthy Indonesian population studied were 8.4%for men and12.8%for women;no obvious differences were noted for H.pylori infection rates by sex or age.TC genotypes of IL-4,TC and CC genotypes of TNF-a,and GA genotypes of PTPN11,were higher in frequency.Both CC and TC genotype of TNF-a T-1031C loci featured higher expressions in the healthy Indonesian population Indonesia studied of(OR=1.99;95%CI:0.67-5.89)and(OR=1.66;95%CI:0.73-3.76),respectively.C allele of IL-1βT-31C gene locus was at a higher risk(OR=1.11;95%CI:0.70-1.73)of H.pylori infection,but no statistical significance was found in our study.CONCLUSION:We reveal that the association between the TNF-a and IL-1βgenotypes may be the susceptibility of H.pylori in the studied population.
基金supported by the Directorate for Research and Community Service,University of Indonesia(RUUI Utama 2012),Jakarta,Indonesia
文摘The application of multi-hull ship or trimaran vessel as a mode of transports in both river and sea environments have grown rapidly in recent years.Trimaran vessels are currently of interest for many new high speed ship projects due to the high levels of hydrodynamic efficiency that can be achieved,compared to the mono-hull and catamaran hull forms.The purpose of this study is to identify the possible effects of using an unsymmetrical trimaran ship model with configuration（S/L） 0.1-0.3 and R/L=0.1-0.2.Unsymmetrical trimaran ship model with main dimensions： L=2000mm,B=200 mm and T=45 mm.Experimental methods（towing tank） were performed in the study using speed variations at Froude number 0.1-0.6.The ship model was pulled by an electric motor whose speed could be varied and adjusted.The ship model resistance was measured precisely by using a load cell transducer.The comparison of ship resistance for each configuration with mono-hull was shown on the graph as a function of the total resistance coefficient and Froude number.The test results found that the effective drag reduction could be achieved up to 17% at Fr=0.35 with configuration S/L=0.1.
文摘The authors make the analysis of first arrivals of the P-wave from Ina-TEWS （Indonesian tsunami early warning system） and CTBT （comprehensive nuclear-test-band treaty） stations. These are used for earthquake early warning, magnitude determination and potential earthquake hazard mitigation based on seismogram acceleration. This research is focused on the study of energy duration of high frequency, and the maximum displacement of P-waves by observing broadband seismograms. The further analysis consists of deconvolution, integration or defferentiation, recursive filtering for data restitution, and applying a Butterworth filter of second order. The Butterworth filter uses high frequency 0.075 Hz to cut the effect of drift, and band-pass frequency 2-4 Hz for use in magnitude calculation. The authors choose potentially damaging earthquakes to be greater than Mw 〉 6.0. Based on the trigger on the three seconds the first arrival P-wave, the dominant period （Td） and amplitude displacement （Pd） was calculated by using data CISI （Indonesian CI Sompet） seismological station, Garut （west Java） and tested for data CTBT, LEM bang, Bandung （LEM station）. This research resulted determination of the P-wave arrival time accurately using integrated skewness and kurtosis. Performance data from the CTBT stations is very high. Signal to noise ratio 〉1,000 after passing through the filter. Such riset conducted to find out a rapid magnitude estimations from predominant frequency of displacement are： log Td = 0.2406 M- 1.3665 （R = 0.73） or M = 4.156 log Td ＋ 5.6797. Relationship of Pd, magnitude moment, Mw and hypocentre, R are log Pd = -4.684 ＋ 0.815 Mw - 1.36 log R. For relation of PGA （peak ground acceleration） and amplitude displacement are log PGA = 1.117 log Pd ＋ 0.728 （R = 0.91）. Furthermore, this formula can be used to support earthquake early warning in west of Java.
基金approved by Mochtar Riady Institute for Nanotechnology(MRIN),Tangerang,Banten Indonesia(Protocol No.2108017-03).
文摘Background:Several vaccines have been approved against COVID-19,and 5 have been used in Indonesia.Due to the decrease in antibody levels 3 to 6 months after the second dose of CoronaVac,healthcare workers received the third booster of mRNA vaccine(mRNA-1273)to increase the antibody level.This study aimed to evaluate the risk factors of anti-S-RBD IgG levels differences in healthcare workers.Methods:This study is a retrospective cohort study of 576 healthcare workers without previous SARS-CoV-2 infection who received 2 doses of CoronaVac and the third dose of mRNA-12736 months after the second dose.Blood samples were obtained 2nd,6th,12th,and 24th weeks after the second dose of CoronaVac vaccine administration,with mRNA-1273 booster on week 20.Quantitative measurements of IgG antibodies were performed with Elecsys Anti-SARS-CoV-2 S immunoassay.We identify the baseline factors predicting post-vaccination antibody titers using univariate and multivariate linear regression analysis.Results:This study comprised 576 participants aged 32 years old,72.05%female,and 45.84%from high-risk occupation subgroups.The median antibodies titer level on the 2nd,6th,12th,and 24th weeks after the second vaccine dose administration were 40.99 u/mL,42.01 u/mL,54.78 u/mL,and 23,225 u/mL.Antibody levels trended highest in female and younger age group(20-29 years old).Conclusions:The third dose of vaccine increased the quantitative SARS-CoV-2 spike IgG antibody titers and eliminated differences in antibodies titer by gender.
基金supported by the 2019 World Class University Research Fund of Bandung Institute of Technology for International Research No.LPPM.PN-10-30-2019the 2018 Overseas Research Grants of the Asahi Glass Foundation No.FTTM.PN-5-01-2019
文摘This study investigates the relation between the Coulomb failure stress of the mainshock with the aftershocks sequence following the 2018 Palu-Donggala earthquake in Indonesia.We calculate the Coulomb failure stress using the available coseismic fault models,which had varied moment magnitudes between M_W7.53~M_W7.62.Different interpretations of the fault sources were suggested by previous studies.While two fault models suggested that one inland fault segment ruptured during the earthquake,another fault model proposed that two fault segments ruptured inland of Central Sulawesi and along the coast of Palu bay.We further overlay the positive and negative values of Coulomb failure stress with the reported relocated aftershock.We find that only by conducting Coulomb failure stress analysis,we can not favour the preference of the coseismic fault which explains aftershock distribution.This investigation demonstrates that additional observational data from geological field surveys are required to identify the surface rupture in comparison with the coseismic fault model.
文摘Objective:To assess the prevalence of Mycobacterium(M.)tuberculosis infection and its associated risks in children under fifteen years of age.Methods:Based on secondary data from the 2018 Indonesian Basic Health Survey(RISKESDAS 2018),this cross-sectional study employed M.tuberculosis infection in children as a dependent variable and age level,sex,region,location,family case positive,and smoking as independent variables.Geospatial analysis was applied to show the prevalence of M.tuberculosis infection and multivariate regression was performed to analyze the risk factors of getting the infection among children under 15 years of age.Results:Prevalence ranges of M.tuberculosis infection among children aged 0-14 years,babies(age<12 months),toddlers(age 12-59 months),and children aged between 5 and 14 years were 0.03%to 0.57%,0%to 0.64%,0%to 0.78%,and 0.01%to 0.53%,respectively in Indonesia.A high prevalence of M.tuberculosis infection among children under 15 years of age was found in Papua and other provinces,such as Kalimantan and Java.Contacting with tuberculosis family members was positively associated with M.tuberculosis infection in children as shown by multivariate logistic regression(OR 8.94;95%CI 5.4-14.6,P<0.05).Conclusions:Contacting with family member who has tuberculosis is related with M.tuberculosis infection among children in Indonesia.Therefore,screening the household for contact with tuberculosis patients is a preventive treatment for children.
文摘The objective of the presented study is to perform a vibration analysis and investigate the stability of a viscoelastic-fluid conveying pipe with an intermediate support.The mathematical model is elaborated in the framework of the Euler-Bernoulli beam theory in combination with the Kelvin-Voight viscoelastic approach.The resulting differential equation of motion and the related boundary conditions and compatibility conditions in the mid-span support are solved analytically using a power series method.The results show that an intermediate support located atξ_(s)=0.1 andξ_(s)=0.5 increases the critical velocity up to 35%and 50.15%,respectively.Also,the non-dimensional critical velocity for an intermediate support atξ_(s)=0.1 is 4.83.
基金sponsored by the Directorate of Research and Community Services,University of Indonesia(Hibah PUPT-Tambahan UI 2015)
文摘Multihull ships are widely used for sea transportation, and those with four hulls are known as quadramarans. Hull position configurations of a quadramaran include the diamond, tetra, and slice. In general, multihull vessels traveling at high speeds have better hydrodynamic efficiency than monohull ships. This study aims to identify possible effects of various quadramaran hull position configurations on ship resistance for hull dimensions of 2 m length, 0.21 m breadth, and 0.045 m thickness. We conducted a towing test in which we varied the hull spacing and speed at Fr values between 0.08 and 0.62 and measured the total resistance using a load cell transducer. The experimental results reveal that the lowest total resistance was achieved with a diamond quadramaran configuration at Fr = 0.1-0.6 and an effective interference factor of up to 0.35 with S/L = 3/10 and R/L = 1/2 at Fr = 0.62.
文摘In the present analysis, several parameters used in a numerical simulation are investigated in an integrated study to obtain their influence on the process and results of this simulation. The parameters studied are element formulation, friction coefficient, and material model. Numerical simulations using the non-linear finite element method are conducted to produce virtual experimental data for several collision scenarios. Pattern and size damages caused by collision in a real accident case are assumed as real experimental data, and these are used to validate the method. The element model study performed indicates that the Belytschko-Tsay element formulation should be recommended for use in virtual experiments. It is recommended that the real value of the friction coefficient for materials involved is applied in simulations. For the study of the material model, the application of materials with high yield strength is recommended for use in the side hull structure.
基金supported by Second Century Fund(C2F)the Faculty of Nursing,Chulalongkorn University,Bangkok,Thailandsupported by the 90th Anniversary of Chulalongkorn University Scholarship(Ratchadaphiseksomphot Endowment Fund)。
文摘Objective:First-line nurse managers are more likely to work according to gender beliefs and stereotypes,which may affect their managerial competence.This study is aimed at comparing managerial competence of male and female first-line nurse managers in public hospitals in Indonesia.Methods:This study employed a descriptive comparative approach with a cross-sectional survey with a total of 256 participants selected from 18 public hospitals.To measure managerial competence,the managerial competence scale for Indonesian first-line nurse managers was used.Data were analyzed using descriptive analyses using mean,standard deviation,and Independent t-test.Results:Managerial competence of male and female first-line nurse managers was not significantly different(P=0.555).Female nurse managers descriptively reported/received higher ranking in facilitating spiritual nursing care,managing self,staffing and professional development,utilizing informatics,and applying quality care improvement.Male nurse managers repor ted higher in leadership and financial management.Conclusions:Female and male first-line nurse managers should be treated equally for leadership and managerial development.
文摘BACKGROUND Brain arteriovenous malformations(bAVMs)remains one of the most prevalent causes of intracranial hemorrhage and stroke-like syndromes in the young adult population.Although it has been agreed upon that definitive treatment using either single or multi-modal approach is warranted for successful bAVM management,much debate still revolves regarding the optimal timing of definitive treatment.CASE SUMMARY In this report,we present a case of delayed,definitive endovascular treatment for ruptured bAVM in a 21-year-old female,3 mo post-ictus.The bAVM,with a left pericallosal feeding artery and cortical draining veins,was successfully obliterated through embolization using the Onyx 18.On follow-up the patient has recommenced her daily activities and experiences only mild occasional headaches with mild motor deficits.The report leads to our review on an important issue regarding the optimal timing of ruptured bAVM definitive management and bring forward the current evidence available on delayed vs immediate definitive bAVM intervention.We also highlight current issues that need to be addressed for clearer guidelines on definitive therapy initiation.CONCLUSION Current treatment paradigms of ruptured bAVM remains elusive,with substantial heterogeneity in the current literature.A consensus on the definition of“acute”vs“delayed”,management goal,follow-up length and outcome parameters are required to support formation of a clear paradigm.
文摘Nowadays, consumers are demanding for minimally processed, additive-free, high quality, fresh-like andmicrobiologically safe foods. However, as food deterioration is the constant threat along the entire food chain, food preservationremains as necessary today as in the past. In this paper, several citrus essential oils, including sweet orange, lemon and lime essentialoil applied directly in fresh orange juice as a natural preservative, were analyzed for their antimicrobial activity. The antimicrobialactivity of each citrus essential oil was assessed against Saccharomyces cerevisiae, Lactobacillus plantarum and Aspergillus nigerusing broth macrodilution. Among all citrus essential oils tested, sweet orange essential oil with 0.10% concentration showedsignificant antimicrobial activity against microorganisms tested. Hence, it was chosen to be applied in the fresh orange juice. Then,shelf life analysis was conducted during 7 d of storage at 5 ℃ and during 2 d of storage at 25 ℃ using selected concentration of theselected citrus essential oil in the fresh orange juice. Based on the results obtained, the addition of sweet orange essential oil with0.10% concentration was not able to prolong the shelf life of the fresh orange juice according to the Indonesian National Standard（SNI）. However, the formulation of fresh orange juice itself was able to improve its shelf life when compared to the shelf life of thecommercial orange juice.
文摘Background： Hypertension is one of the signficant risk factors for further severe cardiovascular diseases. Furthermore, the insidence of hypertension in adult age population has increased gradually. Thus, assessment of hypertension insidence and their risk factors in adult age people has given the beneficience for treating dan preventing program earlier. Aim： To analyze hypertension insidence in adult age and their risk factors that dominanly effect the occurance of hypertension. Method： This study was correlational with survey method. Accidental sampling was conducted to 120 respondents who live around Malioboro district. Hypertension was detected from systole and diastole value, while the risk factors of hypertension were age, gender, family disease history, type of activity, the number of cigarette each day, the length of smoking, random blood glucose, and body mass index. Analyzing the data used Pearson correlation if data were normal, or used Spearman correlation if data were not normal. Findings： From 120 participants, mean of systolic pressure was 120.7 mmHg and mean of diastolic pressure was 78.5 mmHg. Age mean was 39 years old, dominantly was woman amount 83 （69.2%）, and without family disease history as 66 （55%）. Mostly they had moderate physical activity amount 71 （59%）. Mean of cigarette consumtion was 11 pieces/day, for 23 years. Random blood glucose mean was 131 mg/dL and mean of body mass index was 26 kg/m2. Correlation analysis mentioned that body mass index had correlate with systolic and diastolic value significantly （p 〈 0.05）. Conclusion： Systolic and diastolic pressure value in adult age were still normal. Risk factor that correlated significantly with adult age blood pressure was body mass index. Another risk factors such as cholesterol level, blood glucose in fasting condition and two hour post meal, also food consumtion were considered that should be included in next study.
基金supported by ASEAN Studies Center of Chulalongkorn University,Bangkok,Thailand.The project name is International Nursing Networking and Collaborative Research beyond AEC 2015(No.15410170300040)
文摘Objective: There is no single study that has examined nursing research priorities in Vietnam. This study aimed to gain consensus from experts on the nursing research priorities in Vietnam.Methods: A three-round modified Delphi study was used in this study. A focus group discussion among experts was conducted in round I to identify the nursing research priorities(n=23). Data in round I were analyzed using content analysis. In round Ⅱ, participants were invited to rate the importance of each nursing priority topic in a 5-point Likert scale questionnaire, which had a 74%(n=17) response rate. In round Ⅲ, the questionnaire was returned to the experts(n=17) until consensus was reached. Data from round Ⅱ and round Ⅲ were analyzed to produce mean score and final rank.Results: The top 12 research priority lists were identified, which included subthemes and areas of possible investigations. All priorities were classified into three groups in the rank order, namely:(i) nursing management and leadership, which included(1) nursing care quality,(2) management and leadership of nurse managers,(3) nursing image,(4) professional nurse competency, and(5) human resource management;(ii) nursing education, which included(1) knowledge-specific domain,(2) the linkage between education and practice, and(3) nurse teacher workforce;and(iii) nursing service, which included(1) adult nursing concern,(2) patient safety,(3) public health nursing concern, and(4) quality of life of patients and nurses.Conclusions: Consensus among experts was achiever, and the findings are considered as the basis of resources to the most essential research needs in Vietnam.
文摘AIM:To investigate the changes in levels of the lactate dehydrogenase(LDH)enzyme in corneal edema after cataract surgery with trans-corneal oxygenation therapy.METHODS:This pre-post design study design conducted on 15 patients with corneal edema after cataract surgery and receiving trans-corneal oxygenation therapy.Tear sample(using Schirmer paper,from the inferior fornix of the conjunctiva)was carried out prior to trans-corneal oxygenation therapy,on the day 2(D2)and day 5(D5)postoperatively before and after trans-corneal oxygenation therapy.Visual acuity[VA(Log MAR)],corneal endothelial density,central corneal thickness(CCT),and coefficient of variation corneal endothelial(Co V)were recorded.The value of LDH was measured using ELISA.The difference in mean LDH value before and after trans-corneal oxygenation therapy,between two groups were analyzed using Wilcoxon signed rank test.RESULTS:There was a decrease in LDH tear concentration at D2(pre vs post:1127.54±497.09 vs 696.91±489.49;P=0.002)and D5(pre vs post:1064.17±677.77 vs 780.28±428.95;P=0.027)after trans-corneal oxygenation therapy as well as decrease in LDH concentration on the D2 compared to D5(P=0.041).The mean CCT was decreased significantly after the administration of trans-corneal oxygenation(pre vs post:632.10±25.66 vs 563.90±51.54;P=0.005).The mean VA and Co V increased significantly after the administration of trans-corneal oxygenation(P=0.001 and P=0.028,respectively).However,there was no difference in mean of corneal endothelial density(P=0.814).CONCLUSION:Trans-corneal oxygenation therapy is associated with significant decrease of tears LDH levels in post cataract surgery with corneal edema.It is accompanied by clinical improvement such as significant reduction of CCT.
