Quantile regression is gradually emerging as a powerful tool for estimating models of conditional quantile functions, and therefore research in this area has vastly increased in the past two decades. This paper, with ...Quantile regression is gradually emerging as a powerful tool for estimating models of conditional quantile functions, and therefore research in this area has vastly increased in the past two decades. This paper, with the quantile regression technique, is the first comprehensive longitudinal study on mathematics participation data collected in Alberta, Canada. The major advantage of longitudinal study is its capability to separate the so-called cohort and age effects in the context of population studies. One aim of this paper is to study whether the family background factors alter performance on the mathematical achievement of the strongest students in the same way as that of weaker students based on the large longitudinal sample of 2000, 2001 and 2002 mathematics participation longitudinal data set. The interesting findings suggest that there may be differential family background factor effects at different points in the mathematical achievement conditional distribution.展开更多
The Songnen Plain lying in the central part of the Northeast China Plain covers an area of about 170 000 km2. There are vast patches of saline land, which are still in the process of enlargement. The spread of saline ...The Songnen Plain lying in the central part of the Northeast China Plain covers an area of about 170 000 km2. There are vast patches of saline land, which are still in the process of enlargement. The spread of saline land has already caused the worsening of ecoenvironment and hindered agricultural development in the region. The paper analyses background factors of natural environment that caused the spread of saline land according to the information of Landsat TM images. The result shows that among the three kinds of lakes the fault lake is the background factor of natural environment that causes the spread of saline land under arid conditions. Its lakebeach meadows could not recover from the excessive utilization in farming and stockraising. The proposed countermeasures to prevent and control the spread of saline land serve as biological steps or water conservancy facilities to protect the lakebeach meadows of the fault lakes from being artificial excessively utilized.展开更多
With the proposal of Internet-based CET,more emphasis need be attached to listening skill.In order to improve stu dents' listening skill,linguistic knowledge,psychological factors and cultural background knowledge...With the proposal of Internet-based CET,more emphasis need be attached to listening skill.In order to improve stu dents' listening skill,linguistic knowledge,psychological factors and cultural background knowledge,as three key factors affect ing Chinese ESL students,have been analyzed and the improving solutions have been suggested.展开更多
In 152 primary liver cancer (PLC)cases and 1: 1 matched controls, risk factors for PLC as well as relevent pedigree data were investigated. The results showed that in relatives of cases,PLC accumulative mortality was ...In 152 primary liver cancer (PLC)cases and 1: 1 matched controls, risk factors for PLC as well as relevent pedigree data were investigated. The results showed that in relatives of cases,PLC accumulative mortality was much higher than that in those of controls (0. 46% vs. 0. 07%, P< 0. 001 ). Of the cases, the rate in consanguineous relatives was 0. 55 %, but in non-consanguineous relatives it was 0. 08 % (P< 0. 01 ); and with alienating of consanguinity a regularly downward gradient of the rate could be observed ; in addition, an independent effect of inheritance remained significant when environmental factors were controlled by Logistic regression and stratification skill. And with an inheritance background, the role of some environmental factors as HBV infection, psychic trauma was reinforced significantly. These results provided further evidence for understanding the association between inheritance and PLC.展开更多
We present a novel fluorescence spectral unmixing based on target-to-background separation preprocessing, which effectively separates the multi-target fluorescence from all background autofluorescence(BF)without any h...We present a novel fluorescence spectral unmixing based on target-to-background separation preprocessing, which effectively separates the multi-target fluorescence from all background autofluorescence(BF)without any hardware-based BF acquisition and tissue specific BF estimation. Specifically, we first enhance the intrinsic accumulation contrast in target-to-background fluorescence using h-dome transformation; then separate multi-target fluorescence areas from the background in sparse multispectral data utilizing kernel maximum autocorrelation factor analysis; we further use fast marching-based image inpainting method to patch up the removed target fluorescence areas and reconstruct the multispectral BF; with the BF matrix being subtracted from the original data, the multi-target fluorophores are easily unmixed from the subtracted data using multivariate curve resolution-alternating least squares method. In two preliminary in-vivo experiments, the proposed method demonstrated excellent performance to unmix multi-target fluorescences while other state-of-art unmixing methods failed to get desired results.展开更多
From the perspective of cultural background and cross-cultural communicative awareness, this paper discusses the cultural factors in the context of foreign affairs translation. It points out translator should adapt th...From the perspective of cultural background and cross-cultural communicative awareness, this paper discusses the cultural factors in the context of foreign affairs translation. It points out translator should adapt themselves to different cultural backgrounds and fully convey the cultural denotations and connotations in foreign affairs texts, which can achieve successful conversation from the source language to the target language.展开更多
To document the prevalence of risk factors for cardiovascular disease in an unstudied community, a survey of 130 participants from different areas of Sierra Leone was performed. The focus was on cardiovascular disease...To document the prevalence of risk factors for cardiovascular disease in an unstudied community, a survey of 130 participants from different areas of Sierra Leone was performed. The focus was on cardiovascular disease because its prevalence had not been studied and World Health Organization (WHO) reports on Non-Communicable Diseases (NCD) prevalence were extrapolations and not from actual data. Resting blood pressure, fasting blood glucose, fasting lipid levels and carotid intima media thickness (CIMT) were measured. Mean blood pressure in men was slightly lower than in women (132/87 mmHg and 139/90 mmHg respectively), mean fasting blood glucose levels were <100 mg/dL in both groups and mean fasting total cholesterol was higher in women than in men (206 mg versus 193.5 mg/dL). Mean fasting low density lipoprotein levels were similar in both groups, 129 mg/dL in men and 133 mg/dL in women. Mean fasting high density cholesterol was 47.2 mg/dL in men and 55.5 mg/dL in women and CIMT values were similar in both groups, with 60% above the 75th percentile. This study demonstrated a prevalence of cardiovascular risk factors in this population with mean BP placing both men and women in pre-hypertension or stage 1 hypertension ranges and elevated mean low density lipoprotein levels. Fasting total cholesterol, blood glucose and high density lipoprotein were within normal ranges. Mean CIMT values for men and women placed them at risk for subclinical atherosclerosis.展开更多
Several factors influence listening comprehension of English radio news broadcasts. The study adopted a questionnaire to investigate students' recognition of these factors. On the basis of this analysis, students ...Several factors influence listening comprehension of English radio news broadcasts. The study adopted a questionnaire to investigate students' recognition of these factors. On the basis of this analysis, students put emphasis on vocabulary and background knowledge and they were aware of the approaches to better listening comprehension and making some practical preparations before doing the listening tasks. However some differences exist between the effective listeners and less-effective listeners,specially regarding to speech rate and out-of-class relevant practice.展开更多
目的调查嘉兴市感染高危型人乳头瘤病毒(high-risk human papillomavirus,HR-HPV)亚型的分布情况及危险因素,为高危人群宫颈癌筛查提供参考。方法选取浙江省2023年4月至10月宫颈癌检查项目管理系统中嘉兴市22573例女性进行HR-HPV筛查,分...目的调查嘉兴市感染高危型人乳头瘤病毒(high-risk human papillomavirus,HR-HPV)亚型的分布情况及危险因素,为高危人群宫颈癌筛查提供参考。方法选取浙江省2023年4月至10月宫颈癌检查项目管理系统中嘉兴市22573例女性进行HR-HPV筛查,分为HR-HPV阳性组2045例和阴性组20528例,分析患者的病史资料,对可能造成HR-HPV感染的因素进行单因素和多因素回归分析。结果人群中HR-HPV感染率为9.06%,HPV52型在单一感染中占首位(29.6%),多重感染中以2型感染率最高(13.0%)。HR-HPV阳性组与阴性组患者的年龄、文化程度、孕次、流产次数及不同街道差异有统计学意义(P<0.05)。多因素Logistic回归分析显示年龄>45岁、小学及以下学历、孕次是HR-HPV感染的独立危险因素。结论HPV52型是嘉兴市HR-HPV的优势型别,年龄>45岁、小学及以下学历、孕次是HR-HPV感染的相关危险因素,对该类人群仍应重点筛查。展开更多
基金Supported by the National Natural Science Foundation of China (No. 10431010) Education Ministry Key Project (No. 05JJD910001) +1 种基金 National Philosophy and Social Science Foundation grant (No. 07BTJ002) 2006 New Century Excellent Talent Program and Funds supported by Renmin University of China (No. 2006031611)
文摘Quantile regression is gradually emerging as a powerful tool for estimating models of conditional quantile functions, and therefore research in this area has vastly increased in the past two decades. This paper, with the quantile regression technique, is the first comprehensive longitudinal study on mathematics participation data collected in Alberta, Canada. The major advantage of longitudinal study is its capability to separate the so-called cohort and age effects in the context of population studies. One aim of this paper is to study whether the family background factors alter performance on the mathematical achievement of the strongest students in the same way as that of weaker students based on the large longitudinal sample of 2000, 2001 and 2002 mathematics participation longitudinal data set. The interesting findings suggest that there may be differential family background factor effects at different points in the mathematical achievement conditional distribution.
文摘The Songnen Plain lying in the central part of the Northeast China Plain covers an area of about 170 000 km2. There are vast patches of saline land, which are still in the process of enlargement. The spread of saline land has already caused the worsening of ecoenvironment and hindered agricultural development in the region. The paper analyses background factors of natural environment that caused the spread of saline land according to the information of Landsat TM images. The result shows that among the three kinds of lakes the fault lake is the background factor of natural environment that causes the spread of saline land under arid conditions. Its lakebeach meadows could not recover from the excessive utilization in farming and stockraising. The proposed countermeasures to prevent and control the spread of saline land serve as biological steps or water conservancy facilities to protect the lakebeach meadows of the fault lakes from being artificial excessively utilized.
文摘With the proposal of Internet-based CET,more emphasis need be attached to listening skill.In order to improve stu dents' listening skill,linguistic knowledge,psychological factors and cultural background knowledge,as three key factors affect ing Chinese ESL students,have been analyzed and the improving solutions have been suggested.
文摘In 152 primary liver cancer (PLC)cases and 1: 1 matched controls, risk factors for PLC as well as relevent pedigree data were investigated. The results showed that in relatives of cases,PLC accumulative mortality was much higher than that in those of controls (0. 46% vs. 0. 07%, P< 0. 001 ). Of the cases, the rate in consanguineous relatives was 0. 55 %, but in non-consanguineous relatives it was 0. 08 % (P< 0. 01 ); and with alienating of consanguinity a regularly downward gradient of the rate could be observed ; in addition, an independent effect of inheritance remained significant when environmental factors were controlled by Logistic regression and stratification skill. And with an inheritance background, the role of some environmental factors as HBV infection, psychic trauma was reinforced significantly. These results provided further evidence for understanding the association between inheritance and PLC.
基金the Small Animal Imaging Project supported by Geneway Biotech International Trading Co.,Ltd.(No.06-545)the National Natural Science Foundation of China(Nos.61271320,60872102 and 60402021)
文摘We present a novel fluorescence spectral unmixing based on target-to-background separation preprocessing, which effectively separates the multi-target fluorescence from all background autofluorescence(BF)without any hardware-based BF acquisition and tissue specific BF estimation. Specifically, we first enhance the intrinsic accumulation contrast in target-to-background fluorescence using h-dome transformation; then separate multi-target fluorescence areas from the background in sparse multispectral data utilizing kernel maximum autocorrelation factor analysis; we further use fast marching-based image inpainting method to patch up the removed target fluorescence areas and reconstruct the multispectral BF; with the BF matrix being subtracted from the original data, the multi-target fluorophores are easily unmixed from the subtracted data using multivariate curve resolution-alternating least squares method. In two preliminary in-vivo experiments, the proposed method demonstrated excellent performance to unmix multi-target fluorescences while other state-of-art unmixing methods failed to get desired results.
文摘From the perspective of cultural background and cross-cultural communicative awareness, this paper discusses the cultural factors in the context of foreign affairs translation. It points out translator should adapt themselves to different cultural backgrounds and fully convey the cultural denotations and connotations in foreign affairs texts, which can achieve successful conversation from the source language to the target language.
文摘To document the prevalence of risk factors for cardiovascular disease in an unstudied community, a survey of 130 participants from different areas of Sierra Leone was performed. The focus was on cardiovascular disease because its prevalence had not been studied and World Health Organization (WHO) reports on Non-Communicable Diseases (NCD) prevalence were extrapolations and not from actual data. Resting blood pressure, fasting blood glucose, fasting lipid levels and carotid intima media thickness (CIMT) were measured. Mean blood pressure in men was slightly lower than in women (132/87 mmHg and 139/90 mmHg respectively), mean fasting blood glucose levels were <100 mg/dL in both groups and mean fasting total cholesterol was higher in women than in men (206 mg versus 193.5 mg/dL). Mean fasting low density lipoprotein levels were similar in both groups, 129 mg/dL in men and 133 mg/dL in women. Mean fasting high density cholesterol was 47.2 mg/dL in men and 55.5 mg/dL in women and CIMT values were similar in both groups, with 60% above the 75th percentile. This study demonstrated a prevalence of cardiovascular risk factors in this population with mean BP placing both men and women in pre-hypertension or stage 1 hypertension ranges and elevated mean low density lipoprotein levels. Fasting total cholesterol, blood glucose and high density lipoprotein were within normal ranges. Mean CIMT values for men and women placed them at risk for subclinical atherosclerosis.
文摘Several factors influence listening comprehension of English radio news broadcasts. The study adopted a questionnaire to investigate students' recognition of these factors. On the basis of this analysis, students put emphasis on vocabulary and background knowledge and they were aware of the approaches to better listening comprehension and making some practical preparations before doing the listening tasks. However some differences exist between the effective listeners and less-effective listeners,specially regarding to speech rate and out-of-class relevant practice.
文摘目的调查嘉兴市感染高危型人乳头瘤病毒(high-risk human papillomavirus,HR-HPV)亚型的分布情况及危险因素,为高危人群宫颈癌筛查提供参考。方法选取浙江省2023年4月至10月宫颈癌检查项目管理系统中嘉兴市22573例女性进行HR-HPV筛查,分为HR-HPV阳性组2045例和阴性组20528例,分析患者的病史资料,对可能造成HR-HPV感染的因素进行单因素和多因素回归分析。结果人群中HR-HPV感染率为9.06%,HPV52型在单一感染中占首位(29.6%),多重感染中以2型感染率最高(13.0%)。HR-HPV阳性组与阴性组患者的年龄、文化程度、孕次、流产次数及不同街道差异有统计学意义(P<0.05)。多因素Logistic回归分析显示年龄>45岁、小学及以下学历、孕次是HR-HPV感染的独立危险因素。结论HPV52型是嘉兴市HR-HPV的优势型别,年龄>45岁、小学及以下学历、孕次是HR-HPV感染的相关危险因素,对该类人群仍应重点筛查。
