检索结果-南通市图书馆

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

杉木大径材培育研究进展

世界林业研究 2024年第1期37卷 54-58页

作者：周柏屹孙麟均吴鹏飞李明马祥庆福建农林大学林学院福州350002 国家林业和草原局杉木工程技术研究中心福州350002

杉木是我国人工林面积最大的造林树种,在我国林业产业中占有重要地位。随着市场对杉木大径材需求不断增加,有关杉木大径材高效培育的研究成为热点,取得了较多研究成果。文中分别从遗传控制、立地控制、密度控制等方面综述杉木大径材培... 详细信息

杉木是我国人工林面积最大的造林树种,在我国林业产业中占有重要地位。随着市场对杉木大径材需求不断增加,有关杉木大径材高效培育的研究成为热点,取得了较多研究成果。文中分别从遗传控制、立地控制、密度控制等方面综述杉木大径材培育的研究进展,探讨杉木大径材培育的技术体系,指出目前大径材培育研究中存在的问题,并提出加强杉木大径材培育品种筛选、进行高世代良种杉木大径材成材机理长期定位观测、加强杉木大径材定向培育技术的组装配套研究及编制适合大径材培育使用的长轮伐期杉木地位指数表等建议,以为杉木大径材培育提供科学依据。

关键词：杉木大径材遗传控制立地控制密度调控

Normal-Weight Abdominal Obesity: A Risk Factor for Hypertension and Cardiometabolic Dysregulation

在线全文

学校读者我要写书评

暂无评论

Cardiology Discovery 2022年第1期2卷 13-21页

作者： Jinyu sun Qiang Qu Yue Yuan Guozhen sun xiangqing Kong Wei sun Department of Cardiology The First Affiliated Hospital of Nanjing Medical UniversityNanjingJiangsu 210000China.

Objective:This study aimed to examine the associations of waist circumference with hypertension and cardiometabolic dysregulation among normal-weight adults.Methods:This cross-sectional study included 8795 normal-weight participants aged 20 to 79 years from the 2009–2018 US National Health and Nutrition Examination Survey.The demographic characteristics and cardiometabolic risk factors across waist circumference quartiles were summarized.We used adjusted multivariate logistic regression models,subgroup analysis,and restricted cubic spline to analyze the association between waist circumference and the prevalence of hypertension.Thereafter,we used the random forest supervised machine learning method,together with least absolute shrinkage and selection operator regression,to select hypertension-related features and created a predictive model based on regression analysis to identify hypertension in normal-weight individuals.Results:Waist circumference was positively correlated with hypertension in the non-adjusted,minimally adjusted,and fully adjusted models,with odds ratios(95%confidence interval)of 2.28(2.14–2.44),1.27(1.12–1.44),and 1.27(1.12–1.44),respectively.In the fully adjusted model,participants in the highest waist circumference quartile had a higher risk of hypertension relative to those in the lowest quartile,with an odds ratio(95%confidence interval)of 3.87(1.59–10.34).Sensitivity analysis demonstrated the robustness of the association.In the testing set,the predictive model exhibited good performance,with an area under the curve of 0.803,sensitivity of 0.72,specificity of 0.76,and negative predictive value of 0.84.Conclusions:Measuring waist circumference may improve the evaluation of the risk of hypertension and help to manage cardiometabolic risk in normal-weight individuals.

关键词： Waist circumference Hypertension Cardiometabolic dysregulation Normal-weight obesity Body mass index

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

基于励磁电感的变压器铁心剩磁估算

变压器 2024年第6期61卷 6-11页

作者：张云舰孔祥清孙乾侯展马志舜国网山东省电力公司淄博供电公司山东淄博255000 中国石油大学(华东) 山东青岛266580

本文中作者分析了变压器铁心剩磁对励磁电感参数的影响,得到剩磁与励磁电感参数的关系特征,提出了一种应用正负双向脉冲激励源进行励磁电感辨识进而得到变压器铁心剩磁的估算方法,并通过试验验证了该方法的有效性。

关键词：变压器剩磁励磁电感

Multi-locus association study of schizophrenia susceptibility genes with a posterior probability method

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2005年第3期48卷 263-269页

作者： sun xiangqing JIA Yanbin ZHANG Xuegong XU Qi SHEN Yan LI Yanda Ministry of Education(MOE)Key Laboratory of Bioinformatics at Tsinghua University Department of AutomationTsinghua UniversityBeijing 100084China National Laboratory of Medical Molecular Biology Institute of Basic Medical SciencesChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100005China

Schizophrenia is a serious neuropsychiatric illness affecting about 1% of the world’s population. It is considered a complex inheritance disorder. A number of genes are involved in combination in the etiology of the disorder. Evidence implicates the altered dopaminergic trans- mission in schizophrenia. In the present study, in order to identify susceptibility genes for schizophrenia in dopaminergic metabolism, we analyzed 59 single nucleotide polymorphisms (SNPs) in 24 genes of the dopaminergic pathway among 82 unrelated patients with schizophre- nia and 108 matched normal controls. Considering that traditional single-locus association stud- ies ignore the multigenic nature of complex diseases and do not take into account possible in- teractions between susceptibility genes, we proposed a multi-locus analysis method, using the posterior probability of morbidity as a measure of absolute disease risk for a multi-locus genotype combination, and developed an algorithm based on perturbation and average to detect the sus- ceptibility multi-locus genotype combinations, as well as to repress noise and avoid false positive results at our best. A three-locus SNP genotype combination involved in the interactions of COMT and ALDH3B1 genes was detected to be significantly susceptible to schizophrenia.

关键词： posterior probability of morbidity schizophrenia association study multi-locus genotype combination.

Experimental and Theoretical Study on the Flexural Behavior of Recycled Concrete Beams Reinforced with GFRP Bars

在线全文

学校读者我要写书评

暂无评论

Journal of Renewable Materials 2021年第6期9卷 1169-1188页

作者： Xinzhan Chen xiangqing Kong Ying Fu Wanting sun Renguo Guan School of Civil Engineering Liaoning University of TechnologyJinzhou121001China Engineering Research Center of Continuous Extrusion Dalian Jiaotong UniversityDalian116028China

This paper experimentally investigated the flexural behavior of reinforced recycled aggregate concrete(RAC)beams reinforced with glass fiber-reinforced polymer(GFRP)bars.A total of twelve beams were built and tested up to failure under four-point bending.The main parameters were reinforcement ratio(0.38%,0.60%,and 1.17%),recycled aggregate replacement ratio(R=0,50%,and 100%)and longitudinal reinforcement types(GFRP and steel).The flexural capacity,failure modes,flexibility deformation,reinforcement strains and crack distribution of the tested beams were investigated and compared with the calculation models of American code ACI 440.1-R-15,Canadian code CSA S806-12 and ISIS-M03-07.The tested results indicated that the reinforcement ratio has great influence on the ultimate load,crack width and deflection of GFRP-RAC beams,the recycled aggregate replacement ratio has little influence on it.However,it was found that the reinforcement ratio has no obvious influence on the cracking load which was only related to the recycled aggregate replacement ratio.The average cracking load decreased by 5%and 15%as the recycled aggregate replacement ratio increased from 0 to 50%and 100%.For the steel-RAC beams,the ultimate load was found to be about 1/2 of the ultimate load of GFRP-RAC beam under the same condition and the trend of strain,deflection and crack width were different from GFRP-RAC beams.This is due to the different material properties of GFRP bars and steel rebar.On the other hand,the calculation results showed that ACI 440.1-R-15 and CSA S806-12 underestimated the ultimate load of GFRP-RAC beams.Moreover,the deflection prediction of GFRP-RAC beams by CSA S806-12 is relatively accurate compared with ACI 440.1-R-15 and ISIS-M03-07.As for the prediction of crack width,the results of ACI 440.1-R-15 prediction were in good agreement with the experimental results at the ultimate load,with the average value of 1.09±0.28.

关键词： GFRP bars recycled aggregate concrete replacing ratio flexural capacity reinforcement ratio

Preliminary feasibility and hemodynamic performance of a newlydeveloped self-expanding bioprosthesis and 16-F delivery system in transcatheter aortic valve implantation in sheep

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The Journal of Biomedical Research 2012年第3期26卷 211-218页

作者： Jing Cai Yanhui Sheng Shijiang Zhang Wei sun Rong Yang Liping Miao xiangqing Kong Department of Cardiology the First Affiliated Hospital Nanjing Medical University Nanjing Jiangsu 210029 China. Department of Cardiac Surgery the First Affiliated Hospital Nanjing Medical University Nanjing Jiangsu 210029 China.

We sought to evaluate the feasibility and hemodynamic performance of a new self-expanding bioprosthesis and 16-F delivery system in sheep. A 23-mm new self-expanding aortic bioprosthesis was implanted in sheep （n = 10） with a 16-F catheter via the right common carotid artery, Each sheep underwent angiography and coronary angiography before intervention, immediately and 1 h after stent implantation. Electrocardiographic monitoring was carded out during and 2 h after the procedure. Transthoracic echocardiography was employed to detect he- modynamic performance before intervention, immediately and 1 and 2 h after stent implantation. All sheep were euthanized 2 h after successful implantation for macroscopic inspection. In all cases, the new self-expanding aortic bioprosthesis was successfully delivered to the aortic root and released with a 16-F catheter. Successful implantation was achieved in 8 of 10 sheep. Hemodynamic performance and device position of successful implantation were stable 2 h after device deployment. Atrioventricular block was not observed. We conclude that it is feasible to implant the new self-expanding aortic valve with a 16-F delivery system into sheep hearts via the retrograde route.

关键词： percutaneous self-expanding bioprothesis aortic valve sheep

Gamma generalized linear model to investigate the effects of climate variables on the area burned by forest fire in northeast China

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2015年第3期26卷 545-555页

作者： Futao Guo Guangyu Wang John L. Innes xiangqing Ma Long sun Haiqing Hu Fujian Agriculture and Forestry University Sustainable Forest Management Laboratory Faculty of Forestry University of British Columbia VancouverBC V6T 1Z4 Canada Faculty of Forestry Northeast Forestry University

The purpose of this study was to determine a suitable model for investigating the effects of climate factors on the area burned by forest fire in the Tahe forest region, Daxing＇an Mountains, in northeast China. The response variables were the area burned by lightning- caused fire, human-caused fire, and total burned area. The predictor variables were nine climate variables collected from the local weather station. Three regression models were utilized, including multiple linear regression, log- linear model （log-transformation on both response and predictor variables）, and gamma-generalized linear model. The goodness-of-fit of the models were compared based on model fitting statistics such as R2, AIC, and RMSE. The results revealed that the gamma-generalized linear model was generally superior to both multiple linear regressionmodel and log-linear model for fitting the fire data. Further, the best models were selected based on the criteria that the climate variables were statistically significant at at = 0.05. The gamma best models indicated that maximum wind speed, precipitation, and days that rainfall greater than 0.1 mm had significant impacts on the area burned by the lightning-caused fire, while the mean temperature and minimum relative humidity were the .main drivers of the burned area caused by human activities. Overall, the total burned area by forest fire was significantly influenced by days that rainfall greater than 0.1 mm and minimum rela- tive humidity, indicating that the moisture condition of forest stands determine the burned area by forest fire.

关键词： Lightning-caused fire Human-caused fire Multiple linear regression Log-linear model Daxing＇anmountains

在线全文

学校读者我要写书评

暂无评论

萧山区0~36月龄婴幼儿发育状况分析

预防医学 2024年第3期36卷 255-259页

作者：李清钟碧华孙嘉瑞戴锋坡丁艺娜缪湘卿傅亚仙屠玉燕谈文娟俞银飞萧山区妇女儿童健康服务中心浙江杭州311203

目的了解杭州市萧山区0~36月龄婴幼儿发育状况及影响因素,为促进婴幼儿健康发育提供依据。方法选择2022年1月1日—12月31日萧山区社区卫生服务中心儿童保健门诊健康体检的0~36月龄婴幼儿为调查对象,采用问卷收集婴幼儿及其母亲的基本资... 详细信息

目的了解杭州市萧山区0~36月龄婴幼儿发育状况及影响因素,为促进婴幼儿健康发育提供依据。方法选择2022年1月1日—12月31日萧山区社区卫生服务中心儿童保健门诊健康体检的0~36月龄婴幼儿为调查对象,采用问卷收集婴幼儿及其母亲的基本资料,采用年龄与发育进程问卷-第三版(ASQ-3)筛查婴幼儿发育状况;采用多因素logis⁃tic回归模型分析婴幼儿发育状况的影响因素。结果调查0~36月龄婴幼儿2519人,其中男婴1339人,占53.16%;女婴1180人,占46.84%。沟通(CM)、粗大动作(GM)、精细动作(FM)、解决问题(CG)和个人-社会(PS)5个能区有至少1个能区发育异常608例,异常率为24.14%;各能区异常率分别为9.77%、6.59%、7.98%、6.39%和9.33%。多因素logistic回归分析结果显示,性别(男,OR=1.563,95%CI:1.191~2.052)、母亲生育年龄(≥35岁,OR=1.411,95%CI:1.001~1.988)和母亲文化程度(大专以下,OR=1.460,95%CI:1.116~1.912)是婴幼儿CM能区发育异常的影响因素;早产(OR=2.323,95%CI:1.315~4.103)是婴幼儿GM能区发育异常的影响因素;性别(男,OR=1.654,95%CI:1.225~2.232)是婴幼儿FM能区发育异常的影响因素;性别(男,OR=1.511,95%CI:1.086~2.102)、分娩方式(剖宫产,OR=1.460,95%CI:1.060~2.010)是婴幼儿CG能区发育异常的影响因素;性别(男,OR=1.340,95%CI:1.019~1.763)、出生体重(低出生体重,OR=1.985,95%CI:1.149~3.432)是婴幼儿PS能区发育异常的影响因素。结论萧山区0~36月龄婴幼儿发育异常率为24.14%,性别、早产、分娩方式、出生体重、母亲生育年龄和母亲文化程度可影响婴幼儿发育状况。

关键词：婴幼儿发育年龄与发育进程问卷影响因素

宋代“一人二志”现象刍议:以王安石父王益墓志为中心

在线全文

学校读者我要写书评

暂无评论

清华大学学报（哲学社会科学版） 2023年第1期38卷 210-217,224页

作者：仝相卿浙大城市学院历史研究中心杭州310015

王安石父亲王益去世之后,王安石请好友曾巩撰写其墓志,现存曾巩文集当中;然出土王益墓志作者显示为孙侔,故王益一人拥有两方分属于传世文献和出土文献的不同墓志。从王安石与友人通信中发现,他对曾巩撰写的父亲墓志并不满意,认为其中存... 详细信息

王安石父亲王益去世之后,王安石请好友曾巩撰写其墓志,现存曾巩文集当中;然出土王益墓志作者显示为孙侔,故王益一人拥有两方分属于传世文献和出土文献的不同墓志。从王安石与友人通信中发现,他对曾巩撰写的父亲墓志并不满意,认为其中存在“事有缺略”及“须至别作”的部分。经比对可知,王安石所称的“事有缺略”为墓志序文中对王益仕宦影响力的省略,而“须至别作”当为墓志铭文部分。墓主去世之后,丧家先后延请不同人撰写墓志的情况,在宋代乃至中国古代都属于罕见的现象,这也恰好提供了一个透视墓志碑铭生产过程的绝佳视角,亦即丧家对于墓志碑铭的撰写,参与热情虽各有不同,但其对文字定稿的掌控是自始至终存在的。

关键词：宋代一人二志墓志铭王益王安石曾巩