检索结果-南通市图书馆

Biomedical and Environmental Sciences 2018年第2期31卷 97-105页

作者： ZHONG Tao CHUNG Pak-kwong liu jing dong Faculty of Social Science Hong Kong Baptist University

Objective Independent from noise exposure, noise sensitivity plays a pivotal role in people＇s noise annoyance perception and concomitant health deteriorations. The present study empirically investigated the psychometric properties of the Chinese version of the Weinstein Noise Sensitivity Scale-Short Form （CNSS-SF）, the widely used inventory measuring individual differences in noise *** In total, 373 Chinese participants （age = 21.41 ± 3.36） completed the online, anonymous questionnaire package. Examination of the CNSS-SF＇s reliability （internal consistency）, factorial validity through validation and cross-validation, nomological validity and measurement invariance across gender groups were *** The Cronbach alpha coefficients and composite reliabilities indicated sufficient reliability of the CNSS-SF. Two confirmatory factor analyses （CFA）, in two randomly partitioned groups of participants, substantiated the factorial validity of the scale. The nomological validity of the scale was also corroborated by the significant positive association of its score with the trait anxiety score. Measurement invariance of the CNSS-SF was also found across genders via multi-group *** Though not without limitations, findings from the present research provide promising evidence for the utility of the scale in measuring noise sensitivity among the Chinese population. The availability of the CNSS-SF can promote research related to environmental noise and health in China, as well as facilitate cross-cultural comparisons.

关键词： Environmental noise Individual differences Cross-cultural validation Measurement Publichealth

2-Level R-tree Index Based on Spatial Grids and Hilbert R-tree

在线全文

学校读者我要写书评

暂无评论

Geo-Spatial Information Science 2006年第2期9卷 135-141页

作者： GUO jing liu Guangjun dong Xurong GUO Lei Beijing Institute of Command and Technology of Equipment 1 Jingjia Road Huairou District Beijing 101416 China

Multi-level spatial index techniques are always used in large spatial databases. After a general survey of R-tree relevant techniques, this paper presents a novel 2-level index structure, which is based on the schemas of spatial grids, Hilbert R-tree and common R-tree. This structure is named H2R-tree, and it is specifically suitable for the indexing highly skewed, distributed, and large spatial database. Algorithms and a sample are given subsequently.

关键词： spatial index GIS R-tree H2R-tree spatial index GIS R-tree H2R-tree

Syntheses and Crystal Structures of Calix[4]arene Dithiocarbazate Schiff Bases

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2010年第4期26卷 572-577页

作者： SUN jing liu dong-mei WANG Jin-xiang YAN Chao-guo College of Chemistry and Chemical Engineering Yangzhou University Yangzhou 225002 P. R. China

The regioselective syntheses of novel p-tert-butylcalix[4]arenes with functional aldehyde and dithiocarbazate Schiff base groups were carried out. p-tert-Butylcalix[4]arene was alkylated with o-, p-（ω-chloroalkoxy）- benzaldehydes in the system of K2CO3/KI/CH3CN to give calixarene 1,3-dialdehydes. Then the condensation reactions of active calixarene aldehydes with S-methyl and S-benzyldithiocarbazate, calixarene sulfur-containing Schiff bases were efficiently obtained in satisfied yields. The single crystal analysis of the four representative products shows that calixarene aldehydes and Schiff bases exist in cone conformation and there are interesting intermolecular hydrogen-bands and π...π interaction in the crystals.

关键词： Calixarene Alkvlation S-Alkvldithiocarbazate Schiff base: Crystal structure

Comparative studies on utilizing nitrogen capacity between two macroalgae Gracilaria tenuistipitata var. liui (rhodophyta) and Ulva pertusa (chlorophyta) I. Nitrogen storage under nitrogen enrichment and starvation

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2001年第3期13卷 318-322页

作者： liu jing Wen, dong Shuang Lin (Aquaculture Research Laboratory, Ocean University of Qingdao, Qingdao 266003, China. Aquaculture Research Laboratory Ocean University of Qingdao Qingdao 266003 China. Liujw@***

This paper deals with the N storage of Gracilaria tenuistipitata var. liui and Ulva pertusa under ammonium enrichment and starvation. After 10 days of ammonium enrichment, ammonium NH4,+ free amino acid (FAA), protein (pro), chlorophyll (Chi), phycoerythrin (PE) and total dissolved nitrogen (TDN) of the two macroalgae increased significantly. Total nitrogen (TN) increased significantly from 3.65% to 5.78% dry weight of G. tenuistipitata var. liui and 2.82% to 5.07% dw of U. pertusa, respectively. Protein and FAA were the most important N storage pools in the macroalgae. During N-starvation period, individual N pools of the two species were depleted at exponential rates. Each N pool in U. pertusa decreased more rapidly than in G. tenuistipitata, var. liui and the latter was able to sustain fast growth for more time ( > 20 days) than U. pertusa. N demands for supporting growth were different between the two species, U. pertusa grew more rapidly and had higher N demands than G. tenuistipitata var. liui did.

关键词： nitrogen pools storage macroalgae

同方期刊数据库

Clinical characteristics, diagnosis and management of respiratory distress syndrome in full-term neonates

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2010年第19期123卷 2640-2644页

作者： liu jing SHI Yun dong Jian-ying ZHENG Tian LI jing-ya LU Li-li liu jing-jing LIANG jing ZHANG Hao FENG Zhi-chun Department of Neonatology & NICU Bayi Children's Hospital Affiliated to General Hospital of Beijing Military Command Beijing 100700 China

Background Respiratory distress syndrome （RDS） is one of the most common causes of neonatal respiratory failure and neonatal death, however, its clinical characteristics are very different from premature RDS, and these characteristics have not been well documented as yet. This study was to investigate the pathogenesis, clinical characteristics and management strategies of RDS in full-term neonates, with the aim of developing a working protocol for improving the outcome in full-term neonates with RDS. Methods A total of 125 full-term infants with RDS were enrolled in this study. Their clinical and laboratory data were collected for analyzing the characteristics of full-term neonatal RDS. Results （1） The 125 cases included 94 male and 31 female infants, vaginal delivery occurred in 80 cases and cesarean section in 45 cases. （2） The onset time of RDS was （3.11±3.59） hours after birth. （3）The possible reasons included severe perinatal infections in 63 patients, elective cesarean section in 34 cases, severe birth asphyxia in 12 patients, meconium aspiration syndrome in 9 patients, pulmonary hemorrhage in 4 patients and maternal diabetes in 3 patients. （4） Complications included multiple organ system failure （MOSF） in 49 patients, persistent pulmonary hypertension of newborn （PPHN） in 25 patients, acute renal failure in 18 patients, severe hyperkalemia in 25 patients, severe metabolic acidosis in 6 cases, severe myocardial injury in 9 cases, pulmonary hemorrhage in 3 cases, disseminated intravascular coagulation in 14 patients and shock in 12 patients.（5） Four patients died, the mortality was therefore 3.2% with the main cause of septicemia complicating of MOSF, but their prognosis was improved while comprehensive treatment measures including early mechanical ventilation and broad spectrum antibiotics were taken into account. Conclusions RDS is not an uncommon disease in full-term infants and is associated with a higher mortality, its clinical characteristics are very dif

关键词： respiratory distress syndrome clinical characteristics diagnostic criteria management strategies newborn full-term

在线全文

学校读者我要写书评

暂无评论

载铜氮化碳纳米片对单质汞的吸附脱除特性

中国环境科学 2019年第5期39卷 1862-1868页

作者：刘东京张禛吴江江苏大学能源与动力工程学院江苏镇江212013 上海电力大学能源与机械工程学院上海200090

用简易热剥离法合成了氮化碳纳米片(CNNS),再通过等体积浸渍法将铜负载于CNNS表面合成了载铜CNNS吸附剂,用于低温下吸附脱除气态单质汞(Hg^0).利用氮气吸附-脱附、X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线光... 详细信息

用简易热剥离法合成了氮化碳纳米片(CNNS),再通过等体积浸渍法将铜负载于CNNS表面合成了载铜CNNS吸附剂,用于低温下吸附脱除气态单质汞(Hg^0).利用氮气吸附-脱附、X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线光电子能谱(XPS)等手段对吸附剂进行表征.结果表明:CNNS对Hg^0具有良好的吸附性能,吸附温度为120℃时,脱汞效率约为54.2%;载铜修饰可极大提高CNNS的脱汞活性,脱汞效率在40～240℃温度范围内均大于82.3%,这归因于铜与氮化碳间的紧密接触.煅烧温度对载铜CNNS的脱汞活性影响较大,最佳煅烧温度为200℃.通过载铜修饰可有效活化CNNS,提高其对Hg^0的氧化能力,这可能归因于铜离子与氮化碳之间的莫特-肖特基电子转移效应. SO_2和水蒸气对载铜CNNS的脱汞性能有抑制作用.

关键词：单质汞氮化碳铜修饰莫特-肖特基效应

在线全文

学校读者我要写书评

暂无评论

在历史与伦理之间——现代性问题的一个考察

中国人民大学学报 2008年第6期22卷 52-60页

作者：刘敬东清华大学马克思主义学院

资本力量催生了世界历史—全球化时代现代性问题的生成。尽管基于资本的现代性问题已日益凸显,但对仍处在发展中的中国来说,始终保持对商品、货币、资本、民主、自由、法治、科技之批判与建构的巨大张力,穿行在历史与伦理、工具理性与... 详细信息

资本力量催生了世界历史—全球化时代现代性问题的生成。尽管基于资本的现代性问题已日益凸显,但对仍处在发展中的中国来说,始终保持对商品、货币、资本、民主、自由、法治、科技之批判与建构的巨大张力,穿行在历史与伦理、工具理性与价值理性的矛盾冲突中,依然是世界历史—全球化时代的客观法则和生存逻辑,是我们面对现代性问题所应当坚持的理念和实践抉择。

关键词：世界历史资本现代性历史与伦理批判与建构的张力

石墨烯/碳化硅异质界面热学特性的分子动力学模拟

在线全文

学校读者我要写书评

暂无评论

物理学报 2021年第18期70卷 277-286页

作者：刘东静王韶铭杨平江苏大学材料科学与工程学院镇江212013 桂林电子科技大学机电工程学院桂林541004

为了调控石墨烯/碳化硅异质界面传热特性,采用非平衡态分子动力学方法研究温度、尺寸、材料缺陷率对界面热导的影响,通过声子态密度和声子参与率对界面热导变化的原因进行阐述分析.研究表明:两种界面作用力下界面热导均随温度升高而增大... 详细信息

为了调控石墨烯/碳化硅异质界面传热特性,采用非平衡态分子动力学方法研究温度、尺寸、材料缺陷率对界面热导的影响,通过声子态密度和声子参与率对界面热导变化的原因进行阐述分析.研究表明:两种界面作用力下界面热导均随温度升高而增大,但共价键的异质界面热导要高于范德瓦耳斯作用力下的界面热导.异质界面的界面热导随着碳化硅层数的增加而降低,当层数从10层增加到20层时,界面热导下降30.5%;4层时异质结构界面热导最低,分析认为中低频段更多的声子从局域进入离域模式.空位缺陷的引入可以有效地提高界面热导,随着碳化硅和石墨烯缺陷率的增加,界面热导均先升高再降低.300 K时当碳化硅和石墨烯缺陷率分别为20%和35%时界面热导达到最大值,分析认为缺陷的引入会阻碍中频声子的热输运.研究结果揭示可以通过尺寸效应和空位缺陷来进行异质界面的改性研究,有利于第三代半导体微纳器件的设计和热管理.

关键词：异质界面尺寸效应空位缺陷界面热导

东濮凹陷濮卫地区地层压力演化及其与油气运聚的关系

在线全文

学校读者我要写书评

暂无评论

中国石油大学学报（自然科学版） 2010年第5期34卷 25-31,37页

作者：刘景东蒋有录高平中国石油大学地球资源与信息学院山东青岛266555 中原油田分公司勘探开发科学研究院河南濮阳457001

根据实测资料,对东濮凹陷濮卫地区地层压力的纵向分布特征进行分析,并运用盆地模拟方法对古近系沙三、沙四段古地层压力进行恢复;在油气分布与主成藏期地层压力平面和剖面分布关系研究的基础上,探讨异常地层压力演化与油气运聚的关系。... 详细信息

根据实测资料,对东濮凹陷濮卫地区地层压力的纵向分布特征进行分析,并运用盆地模拟方法对古近系沙三、沙四段古地层压力进行恢复;在油气分布与主成藏期地层压力平面和剖面分布关系研究的基础上,探讨异常地层压力演化与油气运聚的关系。结果表明:研究区纵向上发育常压、过渡和超压3种类型的压力带,异常高压的分布受构造背景和盐岩控制,其发育和演化经历了超压原始积累、超压释放和超压重新形成3个阶段;异常高压为油气初次和二次运移的主要动力,垂向上泥、砂压力差促进油气的初次运移,在剩余压力差的作用下,油气近距离运移并围绕洼陷中心区呈环状分布;与油气的充注过程相对应,濮卫地区常压带油气藏是沿活动断层长期运移和沿后期开启断层幕式运移的结果,以早期成藏为主,压力过渡带的油气藏在断层封闭条件下形成,以晚期成藏为主。

关键词：东濮凹陷异常地层压力压力演化盆地模拟油气运聚

在线全文

学校读者我要写书评

暂无评论

民事执行救济制度之完善与和谐社会

河北法学 2006年第1期24卷 95-97页

作者：刘冬京南昌大学法学院江西南昌330047

目前我国正在起草《强制执行法》,一直以来学界讨论的比较多的是如何保障债权人的债权得以实现,然而法律也要保护债务人及第三人的合法权益,于是执行救济制度便应运而生了。然而我国现行的执行救济制度存在着一些不足之处,不利于和谐社... 详细信息

目前我国正在起草《强制执行法》,一直以来学界讨论的比较多的是如何保障债权人的债权得以实现,然而法律也要保护债务人及第三人的合法权益,于是执行救济制度便应运而生了。然而我国现行的执行救济制度存在着一些不足之处,不利于和谐社会的构建。以程序公正和效率价值为理念,以和谐社会的构建为最高目的,对我国司法实践中存在的执行救济类型进行了分析和总结,进而对完善我国民事执行救济制度的设计提出了理性的建议。

关键词：民事执行救济制度《强制执行法》中国和谐社会民事诉讼