检索结果-南通市图书馆

Effects of phosphate on the transport of graphene oxide nanoparticles in saturated clean and iron oxide-coated sand columns

引用

Journal of Environmental Sciences 2021年第5期33卷 80-92页

作者： Jiuyan Chen Weifeng Chen Taotao Lu Yumeng Song Haojing Zhang mengjie wang Xinhai wang Zhichong Qi Minghua Lu Henan International Joint Laboratory of Medicinal Plants Utilization Henan Joint International Research Laboratory of Environmental Pollution Control MaterialsEngineering Research Center for Industrial Recirculation Water Treatment of Henan ProvinceCollege of Chemistry and Chemical EngineeringHenan UniversityKaifeng 475004China Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria Nankai UniversityTianjin 300350China Ministry of Education Key Laboratory of Humid Subtropical Eco-geographical Process Fujian Provincial Key Laboratory for Plant Eco-physiologyCollege of Geographical ScienceFujian Normal UniversityFujian 350007China Department of Hydrology University of BayreuthBayreuth D-95440Germany

In this study, transport behaviors of graphene oxide(GO) in saturated uncoated(i.e., clean sand) and goethite-coated sand porous media were examined as a function of the phosphate. We found that phosphate enhanced the transport of GO over a wide range of solution chemistry(i.e., pH 5.0–9.0 and the presence of 10 mmol/L Na^(+) or 0.5 mmol/L Ca^(2+)). The results were mainly ascribed to the increase of electrostatic repulsion between nanoparticles and porous media. Meanwhile, deposition site competition induced by the retained phosphate was another important mechanism leading to promote GO transport. Interestingly, when the phosphate concentration increased from 0.1 to 1.0 mmol/L, the transportenhancement effect of phosphate in goethite-coated sand was to a much larger extent than that in clean sand. The observations were primarily related to the difference in the total mass of retained phosphate between the iron oxide-coated sand and clean sand columns, which resulted in different degrees of the electrostatic repulsion and competitive effect of phosphate. When the background solution contained 0.5 mmol/L Ca^(2+), phosphate could be bind to sand/goethite-coated sand surface by cation bridging;and consequently, promoted competition between phosphate and nanoparticles for deposition sites, which was an important mechanism for the enhanced effect of phosphate. Moreover, the DLVO theory was applicable to describe GO transport behaviors in porous media in the absence or presence of phosphate. Taken together, these findings highlight the important status and role of phosphate on the transport and fate of colloidal graphene oxide in the subsurface environment.

关键词： Graphene oxide Phosphate Goethite Transport Sand

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Design and validation of a variable camber wing structure

引用

Chinese Journal of Aeronautics 2024年第2期37卷 1-11页

作者： Xiasheng SUN Jingfeng XUE Jin ZHOU Zhigang wang Wenjuan wang mengjie ZHANG Chinese Aeronautical Establishment Beijing 100012China School of Aeronautic Science and Engineering Beihang UniversityBeijing 100191China Aircraft Strength Research Institute of China Xi’an 710065China Graduate School of Chinese Aeronautical Establishment Yangzhou 225002China

Variable camber wing technology is one of the important development trends of green aviation at *** smooth,seamless,continuous and adaptive change of wing camber,the aerodynamic performance is improved in achieving increase in lift and reduction in resistance and *** on the aerodynamic validation model CAE-AVM,Chinese Aeronautical Establishment(CAE)has carried out the design and validation of a variable camber wing,proposed an aerodynamic deformation matrix for the leading and trailing edges of aircraft wings in takeoff,landing and cruise *** structures and driving schemes are compared,and several key technology problems of leading and trailing edge deformation are solved.A full-size leading edge wind tunnel test piece with a span of 2.7 m and a trailing edge ground function test piece are *** deformation and shape maintenance capabilities of the leading edge is verified under real wind load conditions,and the load bearing and deformation capabilities of the trailing edge is verified under simulated follow-on *** results indicate that the leading and trailing edges of the variable camber wing can achieve the required deformation angle and have a certain load-bearing *** study can provide some insights into the application of variable camber wing technology for civil aircraft.

关键词： Variable camber wing Leading edge Trailing edge Structure Measurement and control Test

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

平衡针灸治疗腰椎间盘突出症临床疗效的meta分析

引用

现代医药卫生 2024年第2期40卷 252-257页

作者：黄丽柳鸿林王梦洁薛渊王秀明李健敏王轩山西中医药大学山西太原030000 山西卫生健康职业学院山西晋中030600

目的系统评价平衡针灸治疗腰椎间盘突出症(LDH)的临床疗效。方法计算机检索PubMed、Cochrane Library、Embase、中国知网、中国生物医学文献数据库(CBM)、万方数据库、维普数据库,搜集国内外有关平衡针灸治疗LDH的临床随机对照试验,检... 详细信息

目的系统评价平衡针灸治疗腰椎间盘突出症(LDH)的临床疗效。方法计算机检索PubMed、Cochrane Library、Embase、中国知网、中国生物医学文献数据库(CBM)、万方数据库、维普数据库,搜集国内外有关平衡针灸治疗LDH的临床随机对照试验,检索时限为建库至2022年11月26日。采用RevMan5.3软件进行meta分析。结果共纳入文献19篇,涉及患者2835例,其中对照组1418例,干预组1417例。meta分析结果显示,干预组临床有效率及视觉疼痛模拟量表评分、疼痛分级指数评分、现有疼痛强度评分、Oswestry功能障碍指数评分优于对照组,差异有统计学意义(P<0.00001)。结论平衡针灸及其联合疗法治疗LDH的不良反应少,能在一定程度上改善患者临床症状,是一种安全、有效的方法。

关键词：平衡针腰椎间盘突出症系统评价

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

HiC-3DViewer： a new tool to visualize Hi-C data in 3D space

引用

Frontiers of Electrical and Electronic Engineering in China 2017年第2期5卷 183-190页

作者： Mohamed Nadhir Djekidel mengjie wang Michael Q. Zhang Juntao Gao MOE Key Laboratory of Bioinformatics Bioinformatics Division and Center for Synthetic & Systems Biology TNLIST Department of Automation Tsinghua University Beijing 100084 China School of Pharmaceutical Sciences Tsinghua University Beijing 100084 China Department of Biological Sciences Center for Systems Biology The University of Texas at Dallas Richardson TX 75080- 3021. USA

Background： Although significant progress has been made to map chromatin structure at unprecedented resolution and scales, we are short of tools that enable the intuitive visualization and navigation along the three-dimensional （3D） structure of chromatins. The available tools people have so far are generally script-based or present basic features that do not easily enable the integration of genomic data along with 3D chromatin structure, hence, many scientists find themselves in the obligation to hack tools designed for other purposes such as tools for protein structure study. Methods： We present HiC-3DViewer, a new browser-based interactive tool designed to provide an intuitive environment for investigators to facilitate the 3D exploratory analysis of Hi-C data along with many useful annotation functionalities. Among the key features of HiC-3DViewer relevant to chromatin conformation studies, the most important one is the 1D-to-2D-to-3D mapping, to highlight genomic regions of interest interactively. This feature enables investigators to explore their data at different levels/angels. Additionally, investigators can superpose different genomic signals （such as ChIP-Seq, SNP） on the top of the 3D structure. Results： As a proof of principle we applied HiC-3DViewer to investigate the quality of Hi-C data and to show the spatial binding of GATA1 and GATA2 along the genome. Conclusions： As a user-friendly tool, HiC-3DViewer enables the visualization of inter/intra-chromatin interactions and gives users the flexibility to customize the look-and-feel of the 3D structure with a simple click. HiC-3DViewer is implemented in Javascript and Python, and is freely available at： http：//***/member/nadhir/ HiC3DViewer/. Supplementary information （User Manual, demo data） is also available at this website.

关键词： Hi-C 3D genome visualization chromatin structure prediction

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

不同处理条件对辣椒秸秆青贮品质和营养价值的影响

引用

动物营养学报 2024年第8期36卷 5387-5398页

作者：程志泽艾比布拉·伊马木乃比·阿不来提白丽莎周宇婷于琴汪梦洁新疆农业大学草业学院乌鲁木齐830000

本试验旨在研究不同水分含量和添加剂对辣椒秸秆青贮品质和营养价值的影响。试验以末次收获辣椒后的新鲜辣椒秸秆为原料,通过预干燥将水分含量调整为73%(H)、65%(M)和55%(L),青贮时添加剂使用枯草芽孢杆菌(B)、枯草芽孢杆菌+糖蜜(BM)、... 详细信息

本试验旨在研究不同水分含量和添加剂对辣椒秸秆青贮品质和营养价值的影响。试验以末次收获辣椒后的新鲜辣椒秸秆为原料,通过预干燥将水分含量调整为73%(H)、65%(M)和55%(L),青贮时添加剂使用枯草芽孢杆菌(B)、枯草芽孢杆菌+糖蜜(BM)、枯草芽孢杆菌+纤维素酶(BC),以不加任何添加剂为对照组(C),共12个处理,每个处理3个重复,在室温下青贮60 d后测定各样品的营养成分、发酵品质和相对饲喂价值(RFV)等指标,利用隶属函数对不同处理辣椒秸秆青贮进行综合营养价值评价,选用综合评价前4位的辣椒秸秆青贮(MBM、MBC、LBM和LBC)为原料,以苜蓿作对照,通过体外试验测定其48 h累积产气量、体外发酵参数和干物质(DM)降解率等指标。结果表明:1)水分含量对辣椒秸秆青贮pH,DM、粗蛋白质(CP)、中性洗涤纤维(NDF)、酸性洗涤纤维(ADF)、可溶性碳水化合物(WSC)、粗脂肪(EE)、辣椒素、乳酸(LA)、乙酸(AA)、丙酸(PA)含量和氨态氮/总氮(NH_(3)-N/TN)有极显著影响(P0.05),同时MBM处理的48 h累积产气量高于MBC、LBM和LBC处理。综上所述,辣椒秸秆青贮适宜水分含量为65%,添加剂使用枯草芽孢杆菌+糖蜜效果最佳,可在实际生产中推荐使用。

关键词：辣椒秸秆发酵品质枯草芽孢杆菌综合营养价值评定体外试验

来源：

维普期刊数据库

同方期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Atomically Dispersed Zinc Active Sites Efficiently Promote the Electrochemical Conversion of N2 to NH3

引用

Energy & Environmental Materials 2024年第03期7卷 179-185页

作者： Yanjiao Wei Xinyu wang mengjie Sun Min Ma Jian Tian Minhua Shao School of Materials Science and Engineering Shandong University of Science and Technology Department of Chemical and Biological Engineering The Hong Kong University of Science and Technology Energy Institute and Chinese National Engineering Research Center for Control & Treatment of Heavy Metal PollutionThe Hong Kong University of Science and Technology

At present,the research on highly active and stable nitrogen reduction reaction catalysts is still challenging work for the electrosynthesis of ammonia （NH3）.Herein,we synthesized atomically dispersed zinc active sites supported on N-doped carbon nanosheets （Zn/NC NSs） as an efficient nitrogen reduction reaction catalyst,which achieves a high ammonia yield of46.62μ***-0.85 V （vs RHE） and Faradaic efficiency of 95.8%at-0.70 V （vs RHE）.In addition,Zn/NC NSs present great stability and selectivity,and there is no significant change in NH3rate and Faradaic efficiencies after multiple *** structural characterization shows that the active center in the nitrogen reduction reaction process is the Zn-N4sites in the *** calculation confirms that Zn/NC with Zn-N4configuration has a lower energy barrier for the formation of*NNH intermediate compared with pure N-doped carbon nanosheets （N-C NSs）,thus promoting the hydrogenation kinetics in the whole nitrogen reduction reaction process.

关键词： electrocatalysis nitrogen reduction single-atom catalyst Zn–N4

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Multi-layer hierarchical cellulose nanofibers/carbon nanotubes/vinasse activated carbon composite materials for supercapacitors and electromagnetic interference shielding

引用

Nano Research 2024年第3期17卷 904-912页

作者： Tianxu wang Chuanyin Xiong Yongkang Zhang Bo wang Qing Xiong mengjie Zhao Yonghao Ni College of Bioresources Chemical&Materials Engineering Shaanxi University of Science and TechnologyXi’an 710021China Department of Chemical and biomedical Engineering The University of MaineOronoME 04469USA University of New Brunswick Limerick Pulp&Paper CtrFrederictonNB E3B 5A3Canada

Developing porous self-supporting electrodes with excellent conductivity,good mechanical properties,and high electrochemical activity is crucial for constructing electrode materials with lightweight,ultra-thin,flexible,and high capacitance *** this work,we prepared a cellulose nanofibers(CNFs)/carbon nanotubes(CNTs)/vinasse activated carbon(VAC)(CCV)composite material with a multi-layer hierarchical conductive structure through simple vacuum filtration and *** this composite material,the self-assembly of CNF provides the main skeleton structure of a multi-layer hierarchical *** provides a fast path for the rapid transfer of electrons and is beneficial for the loss of electromagnetic *** provides sufficient double layer *** synergistic effect of the above three endows CCV composite materials with excellent energy storage performance and electromagnetic interference(EMI)shielding *** addition,we endowed the CCV composite with a certain shape and performance by introducing a vitrimer polymer with a dynamic cross-linked network *** summary,thanks to the synergistic effect of various components in the multi-layer hierarchical structure,CCV composite materials exhibit excellent integration performance,especially stable energy storage performance and EMI shielding *** significant properties make CCV composite materials have great application prospects in the fields of energy storage and intelligent EMI shielding.

关键词： self-supporting electrodes multi-layer hierarchical structure supercapacitors electromagnetic interference shielding

来源：

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

SPF鸡的主要垂直传播性病原体及其检测标准分析

引用

实验动物与比较医学 2024年第3期44卷 305-312页

作者：王梦杰马文杰潘喻陈见兴张贺夏长友王玉娥中国农业科学院哈尔滨兽医研究所兽医生物技术国家重点实验室哈尔滨150069 西南大学动物医学院重庆400715

无特定病原体(specific pathogen-free,SPF)鸡在禽病及疫苗研究中应用广泛。垂直传播性疾病以垂直传播的方式传递给雏鸡,降低雏鸡成活率、增加生产成本、给整个养殖行业带来巨大经济损失的同时,严重影响SPF鸡的培育与使用。因此,需要加... 详细信息

无特定病原体(specific pathogen-free,SPF)鸡在禽病及疫苗研究中应用广泛。垂直传播性疾病以垂直传播的方式传递给雏鸡,降低雏鸡成活率、增加生产成本、给整个养殖行业带来巨大经济损失的同时,严重影响SPF鸡的培育与使用。因此,需要加强研究及管理人员对鸡垂直传播性疫病病原的认识,并制定出行之有效的监测措施。质量监测是保证SPF鸡质量的重要环节,其中病原检测是首要环节。在此基础上,应结合净化方式以及生物安全防控手段来培育合格的SPF鸡群。本文综述了包括病毒性病原、细菌性病原和支原体在内的鸡主要垂直传播性病原和这些病原的检测方法,比较美国企业标准和中国国家标准中有关SPF鸡微生物检测项目及方法的差异。结果分析显示,在两种标准中,垂直传播性病原大肠埃希菌、奇异变形杆菌以及沙门菌、禽白血病等垂直传播性疾病均未被列入SPF鸡微生物检测项目。而这些病原存在混合感染特征,一旦爆发,将严重影响鸡群健康。为生产更高质量的SPF鸡群,有必要将其列入必检项目。本文旨在帮助人们了解SPF鸡微生物监测的相关标准以及垂直传播性病原的危害和防控策略,为SPF鸡病原检测及净化提供参考。

关键词： SPF鸡垂直传播病原检测

来源：

维普期刊数据库

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

Temporal and Spatial Trends in HIV Positivity Rate for VCT Clinics—China,2015–2022

引用

China CDC weekly 2024年第1期6卷 6-11页

作者： Yi Liu Rong Su Dongmin Li Shaorong wang mengjie Han National Center for AIDS/STD Control and Prevention Chinese Center for Disease Control and PreventionBeijingChina

Introduction:Human immunodeficiency virus(HIV)voluntary counseling and testing(VCT)clinics play a critical role in identifying and diagnosing HIV *** study aimed to describe the trend of HIV positivity rate(HPR)among Chinese VCT clinics between 2015 and ***:This study utilized data from the China Information System for Disease Control and Prevention to analyze the trend in the HPR for VCT clinics from 2015 to *** HPR was calculated by dividing the number of newly-reported HIV cases by the number of HIV tests,multiplied by 100%.To identify temporal and spatial trends in the HPR,we employed joinpoint regression analysis and the Getis-Ord hotspot ***:From 2015 to 2022,VCT clinics in China performed a total of 22,075,386 HIV tests,leading to the identification of 260,353 HIV cases,resulting in a HPR of 1.18%.The HPR consistently declined over the study period,with an average annual percent change(AAPC)of−7.5%(95%confidence interval:−12.6%,−2.2%,P<0.05).The number of HPR hotspots also decreased from 41 in 2015 to 23 in *** HPR hotspots were primarily located in Yunnan,Sichuan,Guangdong,and Guangxi provincial-level administrative divisions(PLADs).Among the 31 PLADs,16 showed a significant decrease in HPR during the study period(AAPC<0,PAAPC<0.05).Conclusions:VCT clinics in China have played a significant role in identifying HIV *** declining HPR observed in these clinics may indicates the progress has been made in some degree in mitigating HIV among high-risk ***,it is crucial to further improving the utilization of VCT clinics for HIV testing.

关键词： VCT dividing Spatial

来源：

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

镉诱导雏鸡肝脏的损伤作用

引用

安徽科技学院学报 2024年第1期38卷 18-23页

作者：顾成霞王艳张宇唐中齐叶瑞旗汪梦杰刘畅曹迷霞李磊安徽科技学院动物科学学院安徽凤阳233100 动物营养调控与健康安徽省重点实验室安徽凤阳233100 农业农村部猪肉质量安全控制重点实验室安徽凤阳233100

目的:旨在观察镉对雏鸡肝脏的损伤作用,为预防、治疗和诊断镉致雏鸡肝损伤提供依据。方法:200只1日龄健康爱拨益加雏鸡随机分为空白对照组、CdCl_(2)处理组(低、中、高剂量),每组5个重复,每个重复10只。CdCl_(2)处理组分别灌服35、70、1... 详细信息

目的:旨在观察镉对雏鸡肝脏的损伤作用,为预防、治疗和诊断镉致雏鸡肝损伤提供依据。方法:200只1日龄健康爱拨益加雏鸡随机分为空白对照组、CdCl_(2)处理组(低、中、高剂量),每组5个重复,每个重复10只。CdCl_(2)处理组分别灌服35、70、140 mg/kg·BW的CdCl2溶液。雏鸡染镉24 h后,心脏采血处死动物并分离肝组织,利用苏木精-伊红染色观察肝组织病理变化,测定血清中转氨酶活性与肿瘤坏死因子α(Tumor necrosis factor-α,TNF-α)、白细胞介素-6(IL-6)、白细胞介素-1β(Interleukin-1β,IL-1β)含量,比色法测定肝组织中氧化应激指标。结果:35、70 mg/kg CdCl_(2)处理可引起雏鸡血清中转氨酶活性显著提高(P<0.01),雏鸡肝细胞出现空泡变性、炎性浸润和细胞坏死等病理改变;GSH含量、SOD活性显著降低(P<0.01),MDA含量急剧升高(P<0.01),血清中炎性细胞因子IL-1β、IL-6与TNF-α含量显著升高(P<0.01)。结论:CdCl_(2)可导致雏鸡肝组织出现氧化应激,并伴随炎症反应。

关键词：镉雏鸡肝损伤氧化应激

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：