检索结果-南通市图书馆

Environmental dynamics of nitrogen and phosphorus release from river sediments of arid areas

Journal of Arid Land 2024年第5期16卷 685-698页

作者： SU Wenhao WU Chengcheng Sun Xuanxuan lei rongrong lei Li WANG Ling ZHU Xinping College of Bioscience and Resources Environment Beijing University of AgricultureBeijing 102206China Xinjiang Tianxi Environmental Protection Technology Co.Ltd. Urumqi 830000China College of Resources and Environment Sciences Xinjiang Agricultural UniversityUrumqi 830052China

Human activities lead to the accumulation of a large amount of nitrogen and phosphorus in sediments in ***,nitrogen and phosphorus can be affected by environment and re-enter the upper water body,causing secondary pollution of the river *** this study,laboratory simulation experiments were conducted initially to investigate the release of nitrogen and phosphorus from river sediments in Urumqi City and the surrounding areas in Xinjiang Uygur Autonomous Region of China and determine the factors that influence their *** results of this study showed significant short-term differences in nitrogen and phosphorus release characteristics from sediments at different sampling *** proposed secondary kinetics model(i.e.,pseudo-second-order kinetics model)better fitted the release process of sediment nitrogen and *** release of nitrogen and phosphorus from sediments is a complex process driven by multiple factors,therefore,we tested the influence of three factors(pH,temperature,and disturbance intensity)on the release of nitrogen and phosphorus from sediments in this *** most amount of nitrate nitrogen(NO_(3)^(–)-N)was released under neutral conditions,while the most significant release of ammonia nitrogen(NH_(4)^(+)-N)occurred under acidic and alkaline *** release of nitrite nitrogen(NO_(2)^(-)-N)was less affected by *** dissolved total phosphorus(DTP)released significantly in the alkaline water environment,while the release of dissolved organic phosphorus(DOP)was more significant in acidic *** release amount of soluble reactive phosphorus(SRP)increased with an increase in *** sediments released nitrogen and phosphorus at higher temperatures,particularly NH_(4)^(+)-N,NO_(3)^(–)-N,and *** highest amount of DOP was released at 15.0℃.An increase in disturbance intensity exacerbated the release of nitrogen and phosphorus from ***_(4)^(+)-N,DTP,and SRP levels increased linearly with the intens

关键词： sediment nitrogen and phosphorus environmental dynamics pseudo-second-order kinetics model dissolved organic phosphorus(DOP) Urumqi City

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

Progress of environmental research in China from 2000 to 2019: Case studies of JES and ES&T

引用

Journal of Environmental Sciences 2022年第6期34卷 139-141页

作者： rongrong lei Ying Xing Wenbin Liu Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China Institutes of Science and Development Chinese Academy of SciencesBeijing 100190China Hangzhou Institute For Advanced Study UCASHangzhou 310024China

China’s tremendous economic and cultural progress since the initiation of the reforms and opening up process has been accompanied by the steady expansion of its scientific research *** selected Journal of Environmental Sciences and Environmental Science&Technology(hereinafter referred to as JES and ES&T,respectively)as two representative journals for assessing the progress and impact of research in the field of environmental science in China.

关键词： reforms tremendous assessing

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

Burden levels of polychlorinated dibenzo-p-dioxins, dibenzofurans, and polychlorinated biphenyls in typical edible meat animals

引用

Journal of Environmental Sciences 2023年第3期125卷 742-749页

作者： Ying Han Wenbin Liu rongrong lei Mingxin Wang Yingang Xue School of Environmental&Safety Engineering Changzhou UniversityChangzhou 213164China Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China Hangzhou Institute for Advanced Study UCASHangzhou 310024China University of Chinese Academy of Sciences Beijing 100049China

The concentrations and distributions of polychlorinated dibenzo-p-dioxins(PCDDs), polychlorinated dibenzofurans(PCDFs), and polychlorinated biphenyls(PCBs) in the whole blood and meat of eight typical edible animals(chicken, donkey, horse, cattle, rabbit, sheep, duck,and pig) were illustrated. Total concentrations of polychlorinated dibenzo-p-dioxins and dibenzofurans(PCDD/Fs) and PCBs(on a basis of liquid volume) in animal bloods were 142-484 pg/L and 46-62 ng/L, respectively. Total concentrations of PCDD/Fs and PCBs(on a basis of dry weight(dw) and lipid weight(lw)) in animal meat samples were 0.47-1090 pg/g dw(0.47-4513 pg/g lw) and 7.2-23 ng/g dw(10-776 ng/g lw), respectively. TEQs for both PCDD/Fs and PCBs in animal blood and meat samples were(67 ± 27) pg/L and(5.3 ± 14) pg/g dw(24± 56 pg/g lw), respectively. Besides, the dietary intakes of PCDD/Fs and PCBs were also estimated. Chicken and pig contributed more TEQs than other animals. Chicken contributed the most(95%) with high toxicity, followed by pig(3.4%) with high consumption. The dietary intake of chicken might pose risks to consumers who prefer to eat chicken products, who should comprehensively consider the essential nutrients and contaminants in food during dietary intake.

关键词： Food PCDD/Fs PCBs Bioaccumulation Dietary intake Human exposure

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

2015-2021年重庆市肺结核患者发现延误及影响因素分析

引用

中国防痨杂志 2024年第2期46卷 183-189页

作者：陈健石林雷蓉蓉余雅汪清雅吴成果刘小秋中国疾病预防控制中心中国现场流行病学培训项目北京100050 重庆市结核病防治所防治科重庆400050 中国疾病预防控制中心结核病预防控制中心北京102206

目的:分析2015-2021年重庆市肺结核患者发现延误情况及影响因素,为减少患者发现延误提供科学依据。方法:从“中国疾病预防控制信息系统”子系统“传染病报告信息管理系统”收集2015-2021年重庆市肺结核患者相关信息,包括报告时间、患者... 详细信息

目的:分析2015-2021年重庆市肺结核患者发现延误情况及影响因素,为减少患者发现延误提供科学依据。方法:从“中国疾病预防控制信息系统”子系统“传染病报告信息管理系统”收集2015-2021年重庆市肺结核患者相关信息,包括报告时间、患者的人口学特征(性别、年龄、职业)、地区、患者来源、疾病诊断、发病日期和诊断日期,共获得174 067例患者信息。2015-2021年肺结核患者发现延误率的变化采用Joinpoint回归模型进行趋势分析,采用多因素logistic回归分析发现延误的影响因素。结果:2015-2021年重庆市肺结核患者发现延误时间中位数为31(10,73) d,年均发现延误率为53.25%(92 695/174 067);由2015年的58.20%(15 093/25 935),下降至2021年的50.18%(11 026/21 974)。2015-2021年发现延误率总体呈下降趋势(AAPC=-2.5%,t=-2.095,P=0.036),2015-2019年发现延误率下降趋势差异有统计学意义(APC=-4.1%,t=-4.313,P=0.049),2019-2021年发现延误率变化差异无统计学意义(APC=0.8%,t=0.248,P=0.827)。多因素logistic回归分析显示,女性(OR=1.036,95%CI:1.015~1.059)、45~64岁年龄组(OR=1.095,95%CI:1.065~1.125)、无业(离退)人群(OR=1.233,95%CI:1.177~1.294)、农(牧、渔)民(工)(OR=1.624,95%CI:1.546~1.710)、学龄前儿童(OR=3.581,95%CI:2.271~5.761)、工人(OR=1.134,95%CI:1.062~1.213)、渝东北地区(OR=1.270,95%CI:1.244~1.312)、重庆市外(OR=1.136,95%CI:1.087~1.187)、病原学阳性(OR=1.033,95%CI:1.013~1.055)是肺结核患者出现发现延误的危险因素。结论:重庆市肺结核患者的发现延误现象较为严重,随时间变化总体呈下降趋势。需要重点关注重点地区和重点人群发现延误情况,并采取综合性措施。

关键词：结核肺因素分析重庆市

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

Distribution of polychlorinated naphthalenes(PCNs) in the whole blood of typical meat animals

引用

Journal of Environmental Sciences 2018年第10期30卷 208-212页

作者： Ying Han Wenbin Liu Haifeng Li rongrong lei Guorui Liu Lirong Gao Guijin Su State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesBeijing100085China University of Chinese Academy of Sciences Beijing 100049 China

The concentrations and distribution of polychlorinated naphthalenes（PCNs） in the whole blood of eight typical terrestrial meat animals（chicken, duck, rabbit, pig, cattle, sheep,horse and donkey） consumed daily in our life were investigated. The total concentrations（on a liquid volume basis） of PCNs were in a range from 305 to 987 pg/L. Donkey blood contained the highest PCN concentrations. Mono-CNs were the dominant homolog group,accounting for 38%–71% PCNs. Apart from the mono-CNs and tri-CNs homolog groups, two hepta-CNs（mean： 9.5%） contributed most, followed by tetra-CNs（mean： 6.5%）. The congeners CN1, 5/7, 24/14, 27/30, 52/60, 66/67, and 73 were the most abundant congeners or congener groups. The highest toxicity equivalencies（TEQs） were observed in cattle blood（117.4 fg TEQ/L） then chicken blood（117.1 fg TEQ/L）. CN73 contributed 65% to total TEQs,followed by CN70（20%） and CN66/67（14%）. The dietary intakes of PCNs were also *** meat, which forms the second largest component of meat product consumption in China, contributed most to the total TEQs（61%）, followed by beef（27%） and pork（5.9%）. The consumption of chicken might pose the highest risk from exposure to PCNs than other types of meat to populations who prefer to eat chicken meat.

关键词： PCNs Whole blood Animal Distribution Dietary intake

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

Enhanced photocatalytic performance of Bi_(2)O_(2)CO_(3)/Bi_(4)O_(5)Br_(2)/reduced graphene oxide Z-schemehe terojunction via a one-pot room-temperature synthesis

引用

Journal of Environmental Sciences 2024年第4期138卷 418-427页

作者： Xiaoge Wu lei Yan rongrong Qin Qikai Zhang Wei Yang Xiaozhi Wang Yongcai Zhang Min Luo Jianhua Hou College of Environmental Science and Engineering Yangzhou UniversityYangzhouJiangsu 225009China Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization Nanjing 210095China Beijing Xinfeng Aerospace Equipment Co. Ltd.Beijing 100854China Beijing System Design Institute of Electro-Mechanic Engineering Beijing 100005China College of Chemistry and Chemical Engineering Ningxia UniversityYinchuanNingxia 750021China

Bi_(2)O_(2)CO_(3)(BOC)/Bi_(4)O_5Br_(2)(BOB)/reduced graphene oxide(rGO)Z-scheme heterojunction with promising photocatalytic properties was synthesized via a facile one-pot room-temperature ***-thin nanosheets of BOC and BOB were grown in situ on r *** formed 2D/2D direct Z-scheme heterojunction of BOC/BOB with oxygen vacancies(OVs)effectively leads to lower negative electron reduction potential of BOB as well as higher positive hole oxidation potential of BOC,showing improved reduction/oxidation ***,rGO is an acceptor of the electrons from the conduction band of *** dual roles significantly improve the transfer performance of photo-induced charge carriers and accelerate their *** layered nanosheet structure,rich OVs,high specific surface area,and increased utilization efficiency of visible light,the multiple synergistic effects of BOC/BOB/rGO can achieve effective generation and separation of the electron-holes,thereby generating more·O_(2)^(-)and h^(+).The photocatalytic reduction efficiency of CO_(2)to CO(12.91μmol/(g·hr))is three times higher than that of BOC(4.18μmol/(g·hr)).Moreover,it also achieved almost 100%removal of Rhodamine B and cyanobacterial cells within 2 hours.

关键词： Bi_(2)O_(2)CO_(3) Bi_(4)O_(5)Br_(2) Reduced graphene oxide Z-scheme heterojunction Photocatalysis CO_(2)reduction

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

地表水环境监测进展问题分析

引用

当代化工研究 2020年第17期 106-107页

作者：雷荣荣新疆天熙环保科技有限公司新疆830000

在人们日常生活与生产工作中,需要优质的地表水环境提供支撑,要是采取不科学监测技术,那么这样的监测不仅没有实际效果,而且会对人们的身心健康造成影响。基于此,文章将对提升地表水环境监测水平的相关路径加以简要分析。

关键词：环境监测地表水环境进展路径分析

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

Human-induced pluripotent stem cell-derived neural stem cell exosomes improve blood-brain barrier function after intracerebral hemorrhage by activating astrocytes via PI3K/AKT/MCP-1 axis

引用

Neural Regeneration Research 2025年第2期20卷 518-532页

作者： Conglin Wang Fangyuan Cheng Zhaoli Han Bo Yan Pan Liao Zhenyu Yin Xintong Ge Dai Li rongrong Zhong Qiang Liu Fanglian Chen Ping lei Department of Geriatrics Tianjin Medical University General HospitalTianjinChina School of Medicine Nankai UniversityTianjinChina Tianjin Neurological Institute TianjinChina

Cerebral edema caused by blood-brain barrier injury after intracerebral hemorrhage is an important factor leading to poor ***-induced pluripotent stem cell-derived neural stem cell exosomes(hiPSC-NSC-Exos)have shown potential for brain injury repair in central nervous system *** this study,we explored the impact of hiPSC-NSC-Exos on blood-brain barrier preservation and the underlying *** results indicated that intranasal delivery of hiPSC-NSC-Exos mitigated neurological deficits,enhanced blood-brain barrier integrity,and reduced leukocyte infiltration in a mouse model of intracerebral ***,hiPSC-NSC-Exos decreased immune cell infiltration,activated astrocytes,and decreased the secretion of inflammatory cytokines like monocyte chemoattractant protein-1,macrophage inflammatory protein-1α,and tumor necrosis factor-αpost-intracerebral hemorrhage,thereby improving the inflammatory *** sequencing indicated that hiPSC-NSC-Exo activated the PI3K/AKT signaling pathway in astrocytes and decreased monocyte chemoattractant protein-1 secretion,thereby improving blood-brain barrier *** with the PI3K/AKT inhibitor LY294002 or the monocyte chemoattractant protein-1 neutralizing agent C1142 abolished these *** summary,our findings suggest that hiPSC-NSC-Exos maintains blood-brain barrier integrity,in part by downregulating monocyte chemoattractant protein-1 secretion through activation of the PI3K/AKT signaling pathway in astrocytes.

关键词： AKT astrocyte blood-brain barrier cerebral edema exosomes human-induced pluripotent stem cells intracerebral hemorrhage neural stem cells neuroinflammation PI3K

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

重庆市肺结核患者复发情况及影响因素分析

引用

中国热带医学 2020年第11期20卷 1092-1095页

作者：雷蓉蓉汪清雅张婷重庆市结核病防治所重庆400050

目的分析重庆市初治肺结核患者成功治疗后复发流行病学特征及复发影响因素,为制定减少复发干预措施提供基础依据。方法采用回顾性队列研究方法,从结核病信息管理系统中导出2009年登记的成功治疗的初治肺结核患者信息及其复发病案信息,... 详细信息

目的分析重庆市初治肺结核患者成功治疗后复发流行病学特征及复发影响因素,为制定减少复发干预措施提供基础依据。方法采用回顾性队列研究方法,从结核病信息管理系统中导出2009年登记的成功治疗的初治肺结核患者信息及其复发病案信息,采用比例风险回归模型(Cox回归模型)对复发相关因素进行分析。结果共导出2009年成功治疗的初治患者23 034例资料,在2009—2019年观察期间共有519例成功治疗后的初治肺结核患者复发,复发率为2.25%(519/23 034),其中3年内复发患者和5年内复发患者分别占总复发患者的60.31%(313/519)和77.07%(400/519)。单因素分析显示,男性、≥25岁人群、少数民族、农民、病原学阳性、重症和肺部有空洞者复发比例较高,差异具有统计学意义(P<0.05)。多因素分析结果显示,男性、≥25岁人群、少数民族、农民、病原学阳性、肺部有空洞是肺结核复发的危险因素(P<0.05)。结论重庆市成功治疗后的初治肺结核患者5年复发比例较高,多种危险因素可导致复发的发生,应重视复发高危人群,强化对成功治疗患者的随访工作,尽早采取干预措施,减少复发,最终达到降低肺结核疫情的目的。

关键词：肺结核初治成功治疗复发重庆市

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

脱硫设施对2种燃煤锅炉排放VOCs的影响

引用

环境工程学报 2021年第5期15卷 1625-1633页

作者：孙树睿关卫省贾静武小琳雷荣荣贾天琪刘文彬长安大学水利与环境学院西安710054 中国科学院生态环境研究中心环境化学与生态毒理学国家重点实验室北京100085 国家地质实验测试中心北京100037 国科大杭州高等研究院杭州310024 中国科学院大学北京100049

利用GC-MS,对我国7家典型燃煤电厂和2家焦化厂燃煤锅炉在脱硫工艺设施前后排放烟气中的VOCs进行了分析,并计算了燃煤电厂锅炉的排放因子和VOCs的排放量。2种锅炉在脱硫后VOCs的浓度分别为85~1374μg·m^(-3)和27~45μg·m^(-3)。脱硫设... 详细信息

利用GC-MS,对我国7家典型燃煤电厂和2家焦化厂燃煤锅炉在脱硫工艺设施前后排放烟气中的VOCs进行了分析,并计算了燃煤电厂锅炉的排放因子和VOCs的排放量。2种锅炉在脱硫后VOCs的浓度分别为85~1374μg·m^(-3)和27~45μg·m^(-3)。脱硫设施对VOCs的排放影响受多种因素影响,包括脱硫设施的种类、VOCs的性质、脱硫浆液等。通过计算得到各企业的臭氧生成潜势值(OFP),为17~2640μg·m^(-3),其中苯系物对臭氧生成的贡献最大。计算得到燃煤电厂的排放因子为2.37 g·GJ^(-1),每年因火力发电排放的VOCs为4.2×10^(4)t。以上结果可为燃煤电厂的VOCs控制设备和工艺选择提供参考。

关键词：燃煤电厂湿法脱硫挥发性有机物排放因子臭氧生成潜势

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：