Background Transvaginal oocyte retrieval is frequently followed by adverse events related to anesthesia and the procedure.Some research showed that transcutaneous electrical acupoint stimulation(TEAS)can relieve intra...Background Transvaginal oocyte retrieval is frequently followed by adverse events related to anesthesia and the procedure.Some research showed that transcutaneous electrical acupoint stimulation(TEAS)can relieve intraoperative pain and postoperative nausea.Objective This study examined whether TEAS can alleviate pain and relieve adverse symptoms after oocyte retrieval.Design,setting,participants and interventions Altogether 128 patients were randomly divided into the TEAS group and the mock TEAS group.The two groups received a 30-minute-long TEAS or mock TEAS treatment that began 30 min after oocyte retrieval.Main outcome measures The primary outcome was the visual analog scale(VAS)pain score.Secondary outcomes were pressure pain threshold,McGill score,pain rating index(PRI),present pain intensity(PPI),VAS stress score,VAS anxiety score,and postoperative adverse symptoms.Results The baseline characteristics of the two groups were comparable(P>0.05).The VAS pain scores of the TEAS group were lower than those of the mock TEAS group at 60 and 90 min after oocyte retrieval(P<0.05).The McGill score,PRI and PPI in the TEAS group were significantly lower than those in the control group at 60 min after oocyte retrieval(P<0.05).However,the two groups had equivalent beneficial effects regarding the negative emotions,such as nervousness and anxiety(P>0.05).The TEAS group was superior to the mock TEAS group for relieving postoperative adverse symptoms(P<0.05).Conclusion TEAS treatment can relieve postoperative pain and postoperative adverse symptoms for patients undergoing oocyte retrieval.展开更多
BACKGROUND The number of end-stage renal disease patients with diabetes mellitus(DM)who are undergoing peritoneal dialysis is increasing.Peritoneal dialysis-associated peritonitis(PDAP)is a serious complication of per...BACKGROUND The number of end-stage renal disease patients with diabetes mellitus(DM)who are undergoing peritoneal dialysis is increasing.Peritoneal dialysis-associated peritonitis(PDAP)is a serious complication of peritoneal dialysis leading to technical failure and increased mortality in patients undergoing peritoneal dialysis.The profile of clinical symptoms,distribution of pathogenic organisms,and response of PDAP to medical management in the subset of end-stage renal disease patients with DM have not been reported previously.Discrepant results have been found in long-term prognostic outcomes of PDAP in patients with DM.We inferred that DM is associated with bad outcomes in PDAP patients.AIM To compare the clinical features and outcomes of PDAP between patients with DM and those without.METHODS In this multicenter retrospective cohort study,we enrolled patients who had at least one episode of PDAP during the study period.The patients were followed for a median of 31.1 mo.They were divided into a DM group and a non-DM group.Clinical features,therapeutic outcomes,and long-term prognostic outcomes were compared between the two groups.Risk factors associated with therapeutic outcomes of PDAP were analyzed using multivariable logistic regression.A Cox proportional hazards model was constructed to examine the influence of DM on patient survival and incidence of technical failure.RESULTS Overall,373 episodes occurred in the DM group(n=214)and 692 episodes occurred in the non-DM group(n=395).The rates of abdominal pain and fever were similar in the two groups(P>0.05).The DM group had more infections with coagulase-negative Staphylococcus and less infections with Escherichia coli(E.coli)as compared to the non-DM group(P<0.05).Multivariate logistic regression analysis revealed no association between the presence of diabetes and rates of complete cure,catheter removal,PDAP-related death,or relapse of PDAP(P>0.05).Patients in the DM group were older and had a higher burden of cardiovascular disease,with lower level of ser展开更多
Fine-grained sedimentary rocks have become a research focus as important reservoirs and source rocks for tight and shale oil and gas.Laminae development determines the accumulation and production of tight and shale oi...Fine-grained sedimentary rocks have become a research focus as important reservoirs and source rocks for tight and shale oil and gas.Laminae development determines the accumulation and production of tight and shale oil and gas in fine-grained rocks.However,due to the resolution limit of conventional logs,it is challenging to recognize the features of centimeter-scale laminae.To close this gap,complementary studies,including core observation,thin section,X-ray diffraction(XRD),conventional log analysis,and slabs of image logs,were conducted to unravel the centimeter-scale laminae.The laminae recognition models were built using well logs.The fine-grained rocks can be divided into laminated rocks(lamina thickness of<0.01 m),layered rocks(0.01-0.1 m),and massive rocks(no layer or layer spacing of>0.1 m)according to the laminae scale from core observations.According to the mineral superposition assemblages from thin-section observations,the laminated rocks can be further divided into binary,ternary,and multiple structures.The typical mineral components,slabs,and T2spectrum distributions of various lamina types are unraveled.The core can identify the centimeter-millimeter-scale laminae,and the thin section can identify the millimeter-micrometer-scale laminae.Furthermore,they can detect mineral types and their superposition sequence.Conventional logs can identify the meter-scale layers,whereas image logs and related slabs can identify the laminae variations at millimeter-centimeter scales.Therefore,the slab of image logs combined with thin sections can identify laminae assemblage characteristics,including the thickness and vertical assemblage.The identification and classification of lamina structure of various scales on a single well can be predicted using conventional logs,image logs,and slabs combined with thin sections.The layered rocks have better reservoir quality and oil-bearing potential than the massive and laminated rocks.The laminated rocks’binary lamina is better than the ternary and multiple layers due to 展开更多
The purpose of the research is to assess the sound absorption performance(SAP)of acoustic metamaterials made of double-layer Nomex honeycomb structures in which a micro-orifice corresponds to a honeycomb unit.For this...The purpose of the research is to assess the sound absorption performance(SAP)of acoustic metamaterials made of double-layer Nomex honeycomb structures in which a micro-orifice corresponds to a honeycomb unit.For this purpose,the influences of structural parameters on the SAP of acoustic metamaterials were investigated by using experimental testing and a validated theoretical model.In addition,the sandwich structure was optimized by the genetic algorithm.The research shows that the panel thickness and micro-orifice diameter mainly affect the second resonant frequency and second peak sound absorption coefficient(SAC)of the structure.The unit cell size is found to influence the first and second resonant frequencies and two peaks of the SAC.An extremely low side-length of the honeycomb core decreases the SAP of the structure for low-frequency noise signals.Additionally,the sandwich structure presents a better SAP when the diameter of micro-orifices on the front micro-perforated panel(MPP)exceeds that of the back MPP.The sandwich structure shows better noise reduction performance after the optimization aiming at the noise frequency outside trains.展开更多
Earth’s aurora is a luminescent phenomenon generated by the interaction between magnetospheric precipitating particles and the upper atmosphere;it plays an important role in magnetosphere–ionosphere(M-I)coupling.The...Earth’s aurora is a luminescent phenomenon generated by the interaction between magnetospheric precipitating particles and the upper atmosphere;it plays an important role in magnetosphere–ionosphere(M-I)coupling.The transpolar arc(TPA)is a discrete auroral arc distributed in the noon-midnight direction poleward of the auroral oval and connects the dayside to the nightside sectors of the auroral oval.Studying the seasonal variation of TPA events can help us better understand the long-term variation of the interaction between the solar wind,the magnetosphere,and M-I coupling.However,a statistical study of the seasonal variation of TPA incidence has not previously been carried out.In this paper,we have identified 532 TPA events from the IMAGE database(2000–2005)and the Polar database(1996–2002),and calculated the incidence of TPA events for different months.We find a semiannual variation in TPA incidence.Clear peaks in the incidence of TPAs occur in March and September;a less pronounced peak appears in November.We also examine seasonal variation in the northward interplanetary magnetic field(IMF)over the same time period.The intensity and occurrence rate of the northward IMF exhibit patterns similar to that of the TPA incidence.Having studied IMF Bz before TPA onset,we find that strong and steady northward IMF conditions are favorable for TPA formation.We suggest that the semiannual variation observed in TPA incidence may be related to the Russell–McPherron(R-M)effect due to the projection effect of the IMF By under northward IMF conditions.展开更多
基金funded by the Science and Technology Foundation of Sichuan Province (No.2020JDJQ0051)National Natural Science Foundation of China (No.82174517)
文摘Background Transvaginal oocyte retrieval is frequently followed by adverse events related to anesthesia and the procedure.Some research showed that transcutaneous electrical acupoint stimulation(TEAS)can relieve intraoperative pain and postoperative nausea.Objective This study examined whether TEAS can alleviate pain and relieve adverse symptoms after oocyte retrieval.Design,setting,participants and interventions Altogether 128 patients were randomly divided into the TEAS group and the mock TEAS group.The two groups received a 30-minute-long TEAS or mock TEAS treatment that began 30 min after oocyte retrieval.Main outcome measures The primary outcome was the visual analog scale(VAS)pain score.Secondary outcomes were pressure pain threshold,McGill score,pain rating index(PRI),present pain intensity(PPI),VAS stress score,VAS anxiety score,and postoperative adverse symptoms.Results The baseline characteristics of the two groups were comparable(P>0.05).The VAS pain scores of the TEAS group were lower than those of the mock TEAS group at 60 and 90 min after oocyte retrieval(P<0.05).The McGill score,PRI and PPI in the TEAS group were significantly lower than those in the control group at 60 min after oocyte retrieval(P<0.05).However,the two groups had equivalent beneficial effects regarding the negative emotions,such as nervousness and anxiety(P>0.05).The TEAS group was superior to the mock TEAS group for relieving postoperative adverse symptoms(P<0.05).Conclusion TEAS treatment can relieve postoperative pain and postoperative adverse symptoms for patients undergoing oocyte retrieval.
文摘BACKGROUND The number of end-stage renal disease patients with diabetes mellitus(DM)who are undergoing peritoneal dialysis is increasing.Peritoneal dialysis-associated peritonitis(PDAP)is a serious complication of peritoneal dialysis leading to technical failure and increased mortality in patients undergoing peritoneal dialysis.The profile of clinical symptoms,distribution of pathogenic organisms,and response of PDAP to medical management in the subset of end-stage renal disease patients with DM have not been reported previously.Discrepant results have been found in long-term prognostic outcomes of PDAP in patients with DM.We inferred that DM is associated with bad outcomes in PDAP patients.AIM To compare the clinical features and outcomes of PDAP between patients with DM and those without.METHODS In this multicenter retrospective cohort study,we enrolled patients who had at least one episode of PDAP during the study period.The patients were followed for a median of 31.1 mo.They were divided into a DM group and a non-DM group.Clinical features,therapeutic outcomes,and long-term prognostic outcomes were compared between the two groups.Risk factors associated with therapeutic outcomes of PDAP were analyzed using multivariable logistic regression.A Cox proportional hazards model was constructed to examine the influence of DM on patient survival and incidence of technical failure.RESULTS Overall,373 episodes occurred in the DM group(n=214)and 692 episodes occurred in the non-DM group(n=395).The rates of abdominal pain and fever were similar in the two groups(P>0.05).The DM group had more infections with coagulase-negative Staphylococcus and less infections with Escherichia coli(E.coli)as compared to the non-DM group(P<0.05).Multivariate logistic regression analysis revealed no association between the presence of diabetes and rates of complete cure,catheter removal,PDAP-related death,or relapse of PDAP(P>0.05).Patients in the DM group were older and had a higher burden of cardiovascular disease,with lower level of ser
基金National Natural Science Foundation of China(Grant No.42002133,42072150)Science Foundation of China University of Petroleum,Beijing(No.2462021YXZZ003)the Strategic Cooperation Technology Projects of CNPC and CUPB(ZLZX2020-01-06)for the financial supports and permissions to publish this paper
文摘Fine-grained sedimentary rocks have become a research focus as important reservoirs and source rocks for tight and shale oil and gas.Laminae development determines the accumulation and production of tight and shale oil and gas in fine-grained rocks.However,due to the resolution limit of conventional logs,it is challenging to recognize the features of centimeter-scale laminae.To close this gap,complementary studies,including core observation,thin section,X-ray diffraction(XRD),conventional log analysis,and slabs of image logs,were conducted to unravel the centimeter-scale laminae.The laminae recognition models were built using well logs.The fine-grained rocks can be divided into laminated rocks(lamina thickness of<0.01 m),layered rocks(0.01-0.1 m),and massive rocks(no layer or layer spacing of>0.1 m)according to the laminae scale from core observations.According to the mineral superposition assemblages from thin-section observations,the laminated rocks can be further divided into binary,ternary,and multiple structures.The typical mineral components,slabs,and T2spectrum distributions of various lamina types are unraveled.The core can identify the centimeter-millimeter-scale laminae,and the thin section can identify the millimeter-micrometer-scale laminae.Furthermore,they can detect mineral types and their superposition sequence.Conventional logs can identify the meter-scale layers,whereas image logs and related slabs can identify the laminae variations at millimeter-centimeter scales.Therefore,the slab of image logs combined with thin sections can identify laminae assemblage characteristics,including the thickness and vertical assemblage.The identification and classification of lamina structure of various scales on a single well can be predicted using conventional logs,image logs,and slabs combined with thin sections.The layered rocks have better reservoir quality and oil-bearing potential than the massive and laminated rocks.The laminated rocks’binary lamina is better than the ternary and multiple layers due to
基金Project(51775558)supported by the National Natural Science Foundation of ChinaProject(2019 JJ 30034)supported by the Natural Science Foundation for Excellent Youth Scholars of Hunan Province,ChinaProject(20181053303 gg)supported by the Training Objects of Young-Middle-Aged Backbone Teacher in Ordinary Universities of Hunan Province,China。
文摘The purpose of the research is to assess the sound absorption performance(SAP)of acoustic metamaterials made of double-layer Nomex honeycomb structures in which a micro-orifice corresponds to a honeycomb unit.For this purpose,the influences of structural parameters on the SAP of acoustic metamaterials were investigated by using experimental testing and a validated theoretical model.In addition,the sandwich structure was optimized by the genetic algorithm.The research shows that the panel thickness and micro-orifice diameter mainly affect the second resonant frequency and second peak sound absorption coefficient(SAC)of the structure.The unit cell size is found to influence the first and second resonant frequencies and two peaks of the SAC.An extremely low side-length of the honeycomb core decreases the SAP of the structure for low-frequency noise signals.Additionally,the sandwich structure presents a better SAP when the diameter of micro-orifices on the front micro-perforated panel(MPP)exceeds that of the back MPP.The sandwich structure shows better noise reduction performance after the optimization aiming at the noise frequency outside trains.
基金We acknowledge use of OMNI data obtained from the OMNIWeb service at http://omniweb.gsfc.nasa.gov.We thank the Polar UVI team for providing UV images.The IMAGE FUV data were provided by the NASA Space Science Data Center(NSSDC)This work was supported by the National Natural Science Foundation of China(Grants 41961130382,41731068 and 41941001)+1 种基金the Royal Society NAF\R1\191047,International Space Science Institute(ISSI)the young scholar plan of Shandong University at Weihai(2017WHWLJH08).
文摘Earth’s aurora is a luminescent phenomenon generated by the interaction between magnetospheric precipitating particles and the upper atmosphere;it plays an important role in magnetosphere–ionosphere(M-I)coupling.The transpolar arc(TPA)is a discrete auroral arc distributed in the noon-midnight direction poleward of the auroral oval and connects the dayside to the nightside sectors of the auroral oval.Studying the seasonal variation of TPA events can help us better understand the long-term variation of the interaction between the solar wind,the magnetosphere,and M-I coupling.However,a statistical study of the seasonal variation of TPA incidence has not previously been carried out.In this paper,we have identified 532 TPA events from the IMAGE database(2000–2005)and the Polar database(1996–2002),and calculated the incidence of TPA events for different months.We find a semiannual variation in TPA incidence.Clear peaks in the incidence of TPAs occur in March and September;a less pronounced peak appears in November.We also examine seasonal variation in the northward interplanetary magnetic field(IMF)over the same time period.The intensity and occurrence rate of the northward IMF exhibit patterns similar to that of the TPA incidence.Having studied IMF Bz before TPA onset,we find that strong and steady northward IMF conditions are favorable for TPA formation.We suggest that the semiannual variation observed in TPA incidence may be related to the Russell–McPherron(R-M)effect due to the projection effect of the IMF By under northward IMF conditions.