The individual particles collected from a power station were analyzed by time of flight secondary ion mass spectrometry (TOF SIMS). The result indicates the presence of the polycyclic aromatic hydrocarbon (PAHs) as we...The individual particles collected from a power station were analyzed by time of flight secondary ion mass spectrometry (TOF SIMS). The result indicates the presence of the polycyclic aromatic hydrocarbon (PAHs) as well as the oxygenated one. They might be derived from the incomplete combustion of coals. SIMS has proved to be a rapid method for the qualitative analysis of PAHs and OPAHs absorbed on the aerosol particles. New perspectives for better understanding the SIMS spectra obtained from complex mixture such as environmental samples have been opened.展开更多
The objective of the study was to investigate the effect of the organo-modified nanosepiolite(ONSep)on improving the fire safety of polypropylene(PP).The composites based on PP,flame retardant master batch(MB-FR,25 wt...The objective of the study was to investigate the effect of the organo-modified nanosepiolite(ONSep)on improving the fire safety of polypropylene(PP).The composites based on PP,flame retardant master batch(MB-FR,25 wt%PP+50 wt%decabromodiphenyl ether(DBDPE)+25%antimony trioxide(ATO))and ONSep were prepared via melt blending.The results of the limiting oxygen index(LOI)and vertical burning rating(UL-94)test indicated that PP/40 wt%MB composites had no rating with seriously dripping phenomenon,while the LOI value was only 22.5.However,as 4 wt%ONSep was added in PP/40 wt%MB composites,the composites achieved UL94 V-0 rating and the LOI value was 24.3.In comparison,PP/50 wt%MB composites could not reach the V-0 rating either.The TGA results revealed that the addition of ONSep enhanced the thermal stability of the PP/MB-FR composites.The cone calorimeter results indicated that the heat release rate,average mass loss rate,smoke production rate and smoke temperature of the PP/40 wt%MB-FR/4 wt%ONSep composites decreased in comparison with those of PP/40 wt%MB-FR composites.Simultaneously,the Young modulus and impact strength were also much better improved with the increase of ONSep loading.Therefore,the synergistic flame retardancy of ONSep in PP/MB-FR matrix significantly containing a halogen based flame retardant(DBDPE)significantly improved the fire safety and mechanical properties of the composites,and allowed to decrease the total amount of brominated fire retardants.展开更多
The prognosis of T-cell lymphoma (TCL) has been shown to be associated with the clinical characteristics of patients. However, there is little knowledge of whether genetic variations also affect the prognosis of TCL. ...The prognosis of T-cell lymphoma (TCL) has been shown to be associated with the clinical characteristics of patients. However, there is little knowledge of whether genetic variations also affect the prognosis of TCL. This study investigated the associations between single nucleotide polymorphisms(SNPs) in tumor necrosis factor receptor superfamily(TNFRSF) genes and the survival of patients with TCL. A total of 38 tag SNPs in 18 TNFRSF genes were genotyped using Sequenom platform in 150 patients with TCL. Kaplan-Meier survival estimates were plotted and significance was assessed using log-rank tests. Cox proportional hazard models were used to analyze each of these 38 SNPs with adjustment for covariates that might influence patient survival, including sex and international prognostic Index score. Hazard ratios (HRs) and their 95% confidence intervals(CIs) were calculated. Among the 38 SNPs tested, 3 were significantly associated with the survival of patients with TCL. These SNPs were located at LTβR (rs3759333C>T) and TNFRSF17(rs2017662C>T and rs2071336C>T). The 5-year survival rates were significantly different among patients carrying different genotypes and the HRs for death between the different genotypes ranged from 0.45 to 2.46. These findings suggest that the SNPs in TNFRSF genes might be important determinants for the survival of TCL patients.展开更多
Hydraulic transient, which is resulted from sudden increase of inlet pressure for laminar pipeline flow, is studied. The partial differential equation, initial and boundary conditions for transient pressure were const...Hydraulic transient, which is resulted from sudden increase of inlet pressure for laminar pipeline flow, is studied. The partial differential equation, initial and boundary conditions for transient pressure were constructed, and the theoretical solution was obtained by variable-separation method. The partial differential equation, initial and boundary conditions for flow rate were obtained in accordance with the constraint correlation between flow rate and pressure while the transient flow rate distribution was also solved by variable-separation method. The theoretical solution conforms to numerical solution obtained by method of characteristics (MOC) very well.展开更多
文摘The individual particles collected from a power station were analyzed by time of flight secondary ion mass spectrometry (TOF SIMS). The result indicates the presence of the polycyclic aromatic hydrocarbon (PAHs) as well as the oxygenated one. They might be derived from the incomplete combustion of coals. SIMS has proved to be a rapid method for the qualitative analysis of PAHs and OPAHs absorbed on the aerosol particles. New perspectives for better understanding the SIMS spectra obtained from complex mixture such as environmental samples have been opened.
基金supported by Spanish Ministry of Economy and Competitiveness(MINECO)under SEPIFIRE project(RTC-2014-2033-4)Ramón y Cajal fellowship RYC-2012-10737support from"AMAROUT II EUROPE"Marie Curie COFUND action,partially funded by the European Union's 7th Framework Programme under Grant Agreement nº291803.
文摘The objective of the study was to investigate the effect of the organo-modified nanosepiolite(ONSep)on improving the fire safety of polypropylene(PP).The composites based on PP,flame retardant master batch(MB-FR,25 wt%PP+50 wt%decabromodiphenyl ether(DBDPE)+25%antimony trioxide(ATO))and ONSep were prepared via melt blending.The results of the limiting oxygen index(LOI)and vertical burning rating(UL-94)test indicated that PP/40 wt%MB composites had no rating with seriously dripping phenomenon,while the LOI value was only 22.5.However,as 4 wt%ONSep was added in PP/40 wt%MB composites,the composites achieved UL94 V-0 rating and the LOI value was 24.3.In comparison,PP/50 wt%MB composites could not reach the V-0 rating either.The TGA results revealed that the addition of ONSep enhanced the thermal stability of the PP/MB-FR composites.The cone calorimeter results indicated that the heat release rate,average mass loss rate,smoke production rate and smoke temperature of the PP/40 wt%MB-FR/4 wt%ONSep composites decreased in comparison with those of PP/40 wt%MB-FR composites.Simultaneously,the Young modulus and impact strength were also much better improved with the increase of ONSep loading.Therefore,the synergistic flame retardancy of ONSep in PP/MB-FR matrix significantly containing a halogen based flame retardant(DBDPE)significantly improved the fire safety and mechanical properties of the composites,and allowed to decrease the total amount of brominated fire retardants.
文摘The prognosis of T-cell lymphoma (TCL) has been shown to be associated with the clinical characteristics of patients. However, there is little knowledge of whether genetic variations also affect the prognosis of TCL. This study investigated the associations between single nucleotide polymorphisms(SNPs) in tumor necrosis factor receptor superfamily(TNFRSF) genes and the survival of patients with TCL. A total of 38 tag SNPs in 18 TNFRSF genes were genotyped using Sequenom platform in 150 patients with TCL. Kaplan-Meier survival estimates were plotted and significance was assessed using log-rank tests. Cox proportional hazard models were used to analyze each of these 38 SNPs with adjustment for covariates that might influence patient survival, including sex and international prognostic Index score. Hazard ratios (HRs) and their 95% confidence intervals(CIs) were calculated. Among the 38 SNPs tested, 3 were significantly associated with the survival of patients with TCL. These SNPs were located at LTβR (rs3759333C>T) and TNFRSF17(rs2017662C>T and rs2071336C>T). The 5-year survival rates were significantly different among patients carrying different genotypes and the HRs for death between the different genotypes ranged from 0.45 to 2.46. These findings suggest that the SNPs in TNFRSF genes might be important determinants for the survival of TCL patients.
文摘Hydraulic transient, which is resulted from sudden increase of inlet pressure for laminar pipeline flow, is studied. The partial differential equation, initial and boundary conditions for transient pressure were constructed, and the theoretical solution was obtained by variable-separation method. The partial differential equation, initial and boundary conditions for flow rate were obtained in accordance with the constraint correlation between flow rate and pressure while the transient flow rate distribution was also solved by variable-separation method. The theoretical solution conforms to numerical solution obtained by method of characteristics (MOC) very well.
