In this study a model is conceptualized to measure the child mortality under different parity of women such that a better strategy can be formulated to bring down mortality rates. In the estimation of probability of c...In this study a model is conceptualized to measure the child mortality under different parity of women such that a better strategy can be formulated to bring down mortality rates. In the estimation of probability of child mortality some socio demographic variables are taken in consideration. The estimates are obtained under Bayesian procedure. Two different models are formulated for it and model fitting is observed by graphical approach along with the chi square test. First model is betabinomial and second is binomial regression model. Second model shows the better fit on the data. The estimate of probability of child mortality at higher parities namely, parity 3, parity 4 and parity 5 were obtained as 0.06, 0.09 and 0.13 respectively on the basis of the second model.展开更多
We present a mathematical model of a day care center in a developed country (such as Canada), in order to use it for the estimation of individual-to-individual contact rates in young age groups and in an educational g...We present a mathematical model of a day care center in a developed country (such as Canada), in order to use it for the estimation of individual-to-individual contact rates in young age groups and in an educational group setting. In our model, individuals in the population are children (ages 1.5 to 4 years) and staff, and their interactions are modelled explicitly: person-to-person and person-to-environment, with a very high time resolution. Their movement and meaningful contact patterns are simulated and then calibrated with collected data from a child care facility as a case study. We present these calibration results as a first part in the further development of our model for testing and estimating the spread of infectious diseases within child care centers.展开更多
It is important to verify the safety of electric vehicle(EV)wireless power transmission for child passengers by studying the electromagnetic exposure difference between the child passengers and the adult passengers.Th...It is important to verify the safety of electric vehicle(EV)wireless power transmission for child passengers by studying the electromagnetic exposure difference between the child passengers and the adult passengers.The dielectric parameters of the child passengers’body were calculated under the operating frequency of 85 kHz.Using the finite element simulation software COMSOL Multiphysics,a model was established for the child passengers and adult passengers when the EVs charged by the wireless charging coil.This paper analyzed the distribution of magnetic induction intensity and induced electric field intensity generated on the body and head when the child passengers and adult passengers sat in four different positions.Additionally,the difference between the brain electromagnetic exposure values of children and adults was analyzed and compared with the limits set.The results showed that the electromagnetic exposure was the largest when the passenger sat in the co-driver position.The electromagnetic exposure level of child was slightly higher than that of adult at the same position,and the magnetic induction intensity and induced electric field intensity of both were much smaller than the public electromagnetic exposure recommendation values.展开更多
One of the important problems to be tackled in turbo machines is the leakage dynamics characteristics of labyrinth seals. In this paper we analyzed the effect of labyrinth seal structure and the change in fluid flow p...One of the important problems to be tackled in turbo machines is the leakage dynamics characteristics of labyrinth seals. In this paper we analyzed the effect of labyrinth seal structure and the change in fluid flow pressure on the leakage characteristics of seal. Computational fluid dynamics (CFD) model for 3D labyrinth seal was built which provides a basis for reducing steam flow excitation. The streamline pattern and the pressure drop characteristics for leakage of steam through a labyrinth seal was investigated. Simulations of internal flow and leakage characteristics had been performed by CFD software and Black-Child model. The results showed that the amount of leakage is directly proportional to the tooth gap and inlet pressure and inversely proportional to the cavity depth and outlet pressure. The proposed CFD model provides a feasible method to predict the leakage characteristics of labyrinth seal in response to the structure of seal and the change in inlet-outlet pressures.展开更多
Objective to explore dynamic characteristics of the HIV mother to child transmission （MTCT） epidemic in China.Methods A deterministic dynamic transmission model was used to determine the effect of key parameters on ...Objective to explore dynamic characteristics of the HIV mother to child transmission （MTCT） epidemic in China.Methods A deterministic dynamic transmission model was used to determine the effect of key parameters on the likely long-term trends of the HIV MTCT epidemic in China.Matlab 7.0 was used to develop the model.Results The number of the susceptibles （S）,the transmission rate （β）,and the screening proportion （α） of HIV positive pregnant women have the greatest impact on the HIV MTCT epidemic in China.The growth of the MTCT epidemic in China could not be controlled only by decreasing the MTCT transmission rate.The prevalence of HIV positive women should be reduced and more pregnant women should be tested for HIV.Conclusion Prevention of MTCT （PMTCT） should focus not only on the reduction of HIV transmission rates and incidences of HIV among women but also on the increase of HIV testing for pregnant women.The most cost-effective PMTCT means for China should be investigated in future studies.展开更多
目的从青少年人格-家庭环境交互作用的视角,考察亲子关系及环境敏感性对青少年心理问题的共同作用。方法2023年3月-5月在陕西省西安市6个地区随机选取12所中学开展横断面研究,以7010名青少年为研究对象,采用高敏感儿童量表(Highly Sensi...目的从青少年人格-家庭环境交互作用的视角,考察亲子关系及环境敏感性对青少年心理问题的共同作用。方法2023年3月-5月在陕西省西安市6个地区随机选取12所中学开展横断面研究,以7010名青少年为研究对象,采用高敏感儿童量表(Highly Sensitive Child Scale,HSC),病人健康问卷(Patient Health Questionnaire-9,PHQ-9),长处和困难问卷(Strengths and Difficulties Questionnaire,SDQ)和幸福指数量表分别评估青少年的环境敏感性及心理健康水平。结果①女生与男生相比,对环境更加敏感(t=-7.504,P<0.01);②在预测青少年抑郁情绪和外化问题时,亲子冲突、支持和环境敏感性主效应显著(b=-0.263、0.237、0.332,P<0.001;b=0.201、0.220,P<0.001),同时亲子冲突与环境敏感性的交互作用显著(b=-0.072,P<0.05;b=0.092,P<0.05);③Widaman’s的验证和竞争分析发现,亲子冲突与环境敏感性对抑郁情绪和外化行为的交互作用分别支持差异敏感和素质-压力模型(BIC=2170.98、2162.6)。结论高环境敏感性的青少年更易受与父母更多冲突关系的负面影响,也更易从低水平冲突关系中获益,环境敏感性可能是一种易感因素而非脆弱因素。展开更多
文摘In this study a model is conceptualized to measure the child mortality under different parity of women such that a better strategy can be formulated to bring down mortality rates. In the estimation of probability of child mortality some socio demographic variables are taken in consideration. The estimates are obtained under Bayesian procedure. Two different models are formulated for it and model fitting is observed by graphical approach along with the chi square test. First model is betabinomial and second is binomial regression model. Second model shows the better fit on the data. The estimate of probability of child mortality at higher parities namely, parity 3, parity 4 and parity 5 were obtained as 0.06, 0.09 and 0.13 respectively on the basis of the second model.
文摘We present a mathematical model of a day care center in a developed country (such as Canada), in order to use it for the estimation of individual-to-individual contact rates in young age groups and in an educational group setting. In our model, individuals in the population are children (ages 1.5 to 4 years) and staff, and their interactions are modelled explicitly: person-to-person and person-to-environment, with a very high time resolution. Their movement and meaningful contact patterns are simulated and then calibrated with collected data from a child care facility as a case study. We present these calibration results as a first part in the further development of our model for testing and estimating the spread of infectious diseases within child care centers.
基金Department of Edication of Gansu Province(No.2018D-08)。
文摘It is important to verify the safety of electric vehicle(EV)wireless power transmission for child passengers by studying the electromagnetic exposure difference between the child passengers and the adult passengers.The dielectric parameters of the child passengers’body were calculated under the operating frequency of 85 kHz.Using the finite element simulation software COMSOL Multiphysics,a model was established for the child passengers and adult passengers when the EVs charged by the wireless charging coil.This paper analyzed the distribution of magnetic induction intensity and induced electric field intensity generated on the body and head when the child passengers and adult passengers sat in four different positions.Additionally,the difference between the brain electromagnetic exposure values of children and adults was analyzed and compared with the limits set.The results showed that the electromagnetic exposure was the largest when the passenger sat in the co-driver position.The electromagnetic exposure level of child was slightly higher than that of adult at the same position,and the magnetic induction intensity and induced electric field intensity of both were much smaller than the public electromagnetic exposure recommendation values.
基金Sponsored by the National Natural Science Foundation of China (Grant No.10872054,10872055 and 50903082)
文摘One of the important problems to be tackled in turbo machines is the leakage dynamics characteristics of labyrinth seals. In this paper we analyzed the effect of labyrinth seal structure and the change in fluid flow pressure on the leakage characteristics of seal. Computational fluid dynamics (CFD) model for 3D labyrinth seal was built which provides a basis for reducing steam flow excitation. The streamline pattern and the pressure drop characteristics for leakage of steam through a labyrinth seal was investigated. Simulations of internal flow and leakage characteristics had been performed by CFD software and Black-Child model. The results showed that the amount of leakage is directly proportional to the tooth gap and inlet pressure and inversely proportional to the cavity depth and outlet pressure. The proposed CFD model provides a feasible method to predict the leakage characteristics of labyrinth seal in response to the structure of seal and the change in inlet-outlet pressures.
基金supported by the mega-projects of national science research for the 11th Five-Year Plan (2008ZX10001-003)the Fogarty International Center, National Institutes of Health Office of the Director, Office of AIDS Research, National Cancer Institute,National Eye Institute,National Heart,Blood,and Lung Institute,National Institute of Dental & Craniofacial Research,National Institute On Drug Abuse,National Institute of Mental Health,National Institute of Allergy and Infectious Diseases Health,Office of Women’s Health Research, National Institute of Child Health and Human Development,through the International Clinical Research Fellows Program at Vanderbilt (R24 TW007988)
文摘Objective to explore dynamic characteristics of the HIV mother to child transmission （MTCT） epidemic in China.Methods A deterministic dynamic transmission model was used to determine the effect of key parameters on the likely long-term trends of the HIV MTCT epidemic in China.Matlab 7.0 was used to develop the model.Results The number of the susceptibles （S）,the transmission rate （β）,and the screening proportion （α） of HIV positive pregnant women have the greatest impact on the HIV MTCT epidemic in China.The growth of the MTCT epidemic in China could not be controlled only by decreasing the MTCT transmission rate.The prevalence of HIV positive women should be reduced and more pregnant women should be tested for HIV.Conclusion Prevention of MTCT （PMTCT） should focus not only on the reduction of HIV transmission rates and incidences of HIV among women but also on the increase of HIV testing for pregnant women.The most cost-effective PMTCT means for China should be investigated in future studies.
文摘目的分析终末期肝病模型、Child-Pugh分级对乙肝病毒(HBV)感染肝硬化失代偿期患者疾病转归的影响。方法选择本院2019年1月至2021年12月收治的HBV感染肝硬化失代偿期患者106例,随访6个月统计疾病转归状况,并统计终末期肝病模型(Model for end-stage liver disease,MELD)评分、Child-Pugh分级对于疾病转归的诊断效能。结果随访6个月,106例HBV感染肝硬化失代偿期患者死亡率为38.68%(41/106),存活率为61.32%(65/106);存活者MELD评分、Child-Pugh分级分值少于死亡者(P<0.05);随MELD评分和Child-Pugh分级增加,死亡率逐渐升高(P<0.05);以死亡患者作为阳性样本,存活患者作为阴性样本,结合MELD评分、Child-Pugh分级评分变化趋势制作ROC曲线,MELD评分联合Child-Pugh分级诊断的AUC是0.771、敏感性92.68%、特异性92.31%;MELD评分的AUC是0.646、敏感性65.85%、特异性70.77%;Child-Pugh分级的AUC是0.726、敏感性60.97%、特异性73.85%,其中联合诊断敏感性、特异性最高(P<0.05)。结论HBV感染肝硬化失代偿期患者不同MELD评分、Child-Pugh分级预后不同,MELD评分、Child-Pugh分级联合评估预后具有较高敏感性与特异性。
文摘目的从青少年人格-家庭环境交互作用的视角,考察亲子关系及环境敏感性对青少年心理问题的共同作用。方法2023年3月-5月在陕西省西安市6个地区随机选取12所中学开展横断面研究,以7010名青少年为研究对象,采用高敏感儿童量表(Highly Sensitive Child Scale,HSC),病人健康问卷(Patient Health Questionnaire-9,PHQ-9),长处和困难问卷(Strengths and Difficulties Questionnaire,SDQ)和幸福指数量表分别评估青少年的环境敏感性及心理健康水平。结果①女生与男生相比,对环境更加敏感(t=-7.504,P<0.01);②在预测青少年抑郁情绪和外化问题时,亲子冲突、支持和环境敏感性主效应显著(b=-0.263、0.237、0.332,P<0.001;b=0.201、0.220,P<0.001),同时亲子冲突与环境敏感性的交互作用显著(b=-0.072,P<0.05;b=0.092,P<0.05);③Widaman’s的验证和竞争分析发现,亲子冲突与环境敏感性对抑郁情绪和外化行为的交互作用分别支持差异敏感和素质-压力模型(BIC=2170.98、2162.6)。结论高环境敏感性的青少年更易受与父母更多冲突关系的负面影响,也更易从低水平冲突关系中获益,环境敏感性可能是一种易感因素而非脆弱因素。
