检索结果-南通市图书馆

Effect of temperature on Lu’an bituminous char structure evolution in pyrolysis and combustion

Frontiers in Energy 2021年第1期15卷 14-25页

作者： Yandi ZHANG Yinhe LIU xiaoli duan Yao ZHOU Xiaoqian LIU Shijin XU State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong UniversityXi'an 710049China

In the process of pyrolysis and combustion of coal particles, coal structure evolution will be affected by the ash behavior, which will further affect the char reactivity, especially in the ash melting temperature zone. Lu’an bituminous char and ash samples were prepared at the N_(2) and air atmospheres respectively across ash melting temperature. A scanning electron microscope (SEM) was used to observe the morphology of char and ash. The specific surface area (SSA) analyzer and thermogravimetric analyzer were respectively adopted to obtain the pore structure characteristics of the coal chars and combustion parameters. Besides, an X-ray diffractometer (XRD) was applied to investigate the graphitization degree of coal chars prepared at different pyrolysis temperatures. The SEM results indicated that the number density and physical dimension of ash spheres exuded from the char particles both gradually increased with the increasing temperature, thus the coalescence of ash spheres could be observed obviously above 1100℃. Some flocculent materials appeared on the surface of the char particles at 1300℃, and it could be speculated that β-Si_(3)N_(4) was generated in the pyrolysis process under N_(2). The SSA of the chars decreased with the increasing pyrolysis temperature. Inside the char particles, the micropore area and its proportion in the SSA also declined as the pyrolysis temperature increased. Furthermore, the constantly increasing pyrolysis temperature also caused the reactivity of char decrease, which is consistent with the results obtained by XRD. The higher combustion temperature resulted in the lower porosity and more fragments of the ash.

关键词： bituminous char pyrolysis ash structure evolution reactivity

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

Health risk assessment of dietary exposure to polycyclic aromatic hydrocarbons in Taiyuan, China

引用

Journal of Environmental Sciences 2014年第2期26卷 432-439页

作者： Jing Nie Jing Shi xiaoli duan Beibei Wang Nan Huang Xiuge Zhao Chinese Research Academy of Environmental Sciences State Key Lab of Environmental Criteria and Risk Assessment Soil and Water Science College of Resources and Environmental Sciences China Agricultural University Department of Safety Engineering China Institute of Industrial Relations

Sixteen polycyclic aromatic hydrocarbons （PAHs） were determined in 24 duplicate-diet samples from people in Taiyuan during summer and winter in 2009. Dietary intake of PAHs for 2862 participants was subsequently estimated by a survey in Taiyuan. Results from these 24 samples were compared with a raw food study in Taiyuan in 2008. Three main sources of dietary PAHs are vegetables, wheat flour and fruits, the sum of which contributes 75.95% of PAHs in dietary food. Compared to the estimated value in raw food, much more B[a]Peq （benzo[a]pyrene equivalents） were detected in food samples collected in the duplicate-diet study in Taiyuan （60.75 ng/day）. The cooking process may introduce more B[a]Peq into food, and the relative contribution of 16 PAHs in the diet would be changed during the cooking procedure.

关键词： dietary exposure food health risk assessment polycyclic aromatic hydrocarbons (PAHs) benzo[a]pyrene

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

Morphology Structure Evolution and Combustion Reactivity of Bituminous Char at Around Ash Melting Temperature

引用

Journal of Thermal Science 2022年第6期31卷 2189-2202页

作者： ZHANG Yandi YANG Huan WANG Bo HMShahzaib KHAN duan xiaoli LIU Yinhe State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi'an Jiaotong UniversityXi'an 710049China

In slag tapping furnaces, char particles undergo a series of complex structural evolution before and after being captured by the liquid slag layer. The evolution results affect the carbon conversion rate and are affected by temperature fluctuations, especially in the ash melting temperature zone. Experimental study on structure evolution of bituminous char prepared at around ash melting temperature was carried out on a fixed bed. The morphology, specific surface area and mineral chemical composition were measured at different temperatures. Experimental results show that the number density and the size of ash droplets exuded on the char surface increased significantly with the increasing temperature. The ash specific surface area from gasification was slightly greater than that from combustion. The residual content of chloride in the char become 1% and the contents of Fe, K, Mg and Na decrease significantly during the pyrolysis process across the ash melting temperature zone. The diffraction intensity of oldhamite increase which indicates the reaction of carbon substrate with minerals during the evolution;the diffraction intensity of quartz dramatically decreases for the reason of anorthite generation. The ignition and burnout temperatures of char were found to increase and the combustion stability decreased with the increasing pyrolysis temperature.

关键词： coal char structure evolution carbothermal reaction combustion

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

Several major issues concerning the environmental transmission and risk prevention of SARS-CoV-2

引用

Science China Earth Sciences 2022年第6期65卷 1047-1056页

作者： Jin MA Jian XU xiaoli ZHAO Shouliang HUO xiaoli duan Yunsong MU Ying WANG Yuan WEI Jiang CHANG Xiaowei JIN Fengchang WU State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China School of Environment and Nature Resource Renmin University of ChinaBeijing 100872China School of Space and Environment Beihang UniversityBeijing 102206China China National Environmental Monitoring Centre Beijing 100012China

Coronavirus disease 2019(COVID-19) is the most serious infectious disease pandemic in the world in a century, and has had a serious impact on the health, safety, and social and economic development of all mankind. Since the earth entered the“Anthropocene”, human activities have become the most important driving force of the evolution of the earth system. At the same time, the epidemic frequency of major human infectious diseases worldwide has been increasing, with more than 70% of novel diseases having zoonotic origins. The review of several major epidemics in human history shows that there is a common rule, i.e., changes in the natural environment have an important and profound impact on the occurrence and development of epidemics. Therefore, the impact of the natural environment on the current COVID-19 pandemic and its mechanisms have become scientific issues that need to be resolved urgently. From the perspective of the natural environment, this study systematically investigated several major issues concerning the environmental transmission and risk prevention of Severe Acute Respiratory Syndrome Coronavirus 2(SARS-CoV-2). From a macroscopic temporal and spatial scale, the research focus on understand the impact of the destruction of the natural environment and global changes on the outbreak of infectious diseases;the threat of zoonotic diseases to human health;the regularity for virus diffusion, migration and mutation in environmental media;the mechanisms of virus transmission from animals and environmental media to humans;and environmental safety, secondary risk prevention and control of major epidemics. Suggestions were made for future key research directions and issues that need attention, with a view to providing a reference for the prevention and control of the global coronavirus disease 2019, and to improving the ability of response to major public health emergencies.

关键词： SARS-CoV-2 Environmental transmission Risk prevention Zoonotic diseases Ecological security

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

A Social Intervention Approach to Rehabilitate the Health Psychology of Leftbehind Children with Psychological Problems in Healthcare Settings

引用

International Journal of Mental Health Promotion 2022年第3期24卷 415-423页

作者： Qijie Jiang Chi Zhang xiaoli duan Siyi Pei Business School Chengdu UniversityChengdu610106China School of Management The University of SheffieldWestern BankSheffieldS102TNUK School of Economic and Management Zhengzhou Normal UniversityZhengzhou450044China Sichuan Academy of Social Science Chengdu610071China

Background:Left-behind children are more inclined to generate psychological problems relative to non-leftbehind children,thus how to rehabilitate their health psychology and promote the psychological health development of this special disadvantaged group in healthcare settings should be paid more attention ***:This paper attempts to present a social intervention approach and explore its impact on the rehabilitation of rural leftbehind children’s psychological problems in healthcare ***:This study firstly designed a social intervention program based on the health psychology theory and the generation causes of left-behind children’s psychological problems,and then three groups were applied to test the effectiveness of the program with comparison ***:Compared with the control left-behind children(group 2),the left-behind children in the experimental group 1 had positive changes in learning anxiety,physical symptoms,anxiety about people,loneliness tendency,self-blame tendency,allergy tendency,terror tendency and impulse *** their mental health can be rehabilitated to the level of non-left-behind children in group ***:This study revealed positive effects of specially designed social intervention program on the rehabilitation of left-behind children’s psychological problems in healthcare *** results have both theoretical and practical implications.

关键词： Health psychology left-behind children rehabilitation healthcare settings experiment

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

Collaborative control of fine particles and ozone required in China for health benefit

引用

Frontiers of Environmental Science & Engineering 2023年第8期17卷 1-11页

作者： Ling Qi Zhige Tian Nan Jiang Fangyuan Zheng Yuchen Zhao Yishuo Geng xiaoli duan School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China

PM2.5 concentration declined significantly nationwide,while O3 concentration increased in most regions in China in 2013–*** evidences proved that peak season O3 is related to increased death risk from non-accidental and respiratory *** on these new evidences,we estimate excess deaths associated with long-term exposure to ambient PM2.5 and O3 in China following the counterfactual analytic framework from Global Burden *** deaths from non-accidental diseases associated with long-term exposure to ambient O3 in China reaches to 579(95%confidential interval(CI):93,990)thousand in 2020,which has been significantly underestimated in previous *** addition,the increased excess deaths associated with long-term O3 exposure(234(95%CI:177,282)thousand)in 2013–2020 offset three quarters of the avoided excess deaths(302(95%CI:244,366)thousand)mainly due to PM2.5 exposure *** key regions(the North China Plain,the Yangtze River Delta and the Fen-Wei Plain),the former is even larger than the latter,particularly in 2017–*** benefit of PM2.5 concentration reduction offsets the adverse effects of population growth and aging on excess deaths attributed to PM2.5 *** of excess deaths associated with O3 exposure is mainly due to the strong increase of O3 concentration,followed by population *** the faster population aging process in the future,collaborative control,and faster reduction of PM2.5 and O3 are needed to reduce the associated excess deaths.

关键词： Excess deaths Long-term exposure Fine particle Ozone

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

Role of Meteorological Parameters in COVID-19 Pandemic Waves in Delhi, India

引用

Open Journal of Air Pollution 2023年第2期12卷 31-49页

作者： Deepak Gupta xiaoli duan School of Energy and Environmental Engineering University of Science and Technology Beijing Beijing China

In this study, the levels of meteorological parameters like maximum temperature (°F), relative temperature (°F), minimum temperature (°F), humidity (%), dew point (°F), wind speed (mph), rainfall (in), and air pressure (in) were analyzed for all three COVID-19 pandemic waves in the NCT of Delhi, India. After doing statistical analysis, the results showed that only a few parameters, like temperature (maximum, minimum, and relative), dew point, humidity, and air pressure, were linked to the start of COVID-19 pandemic waves, and rainfall had nothing to do with COVID-19 during any of the three waves. So, according to the results of this study, the Indian government should take strict steps to stop the spread of the fourth wave of COVID-19 and any other diseases that can spread in urban areas based on the meteorological conditions.

关键词： COVID-19 Meteorological Parameters SARS-CoV-2 Correlation

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

Emerging concern on air pollution and health:Trade-off between air pollution exposure and physical activity

引用

Eco-Environment & Health 2024年第2期3卷 202-207页

作者： Pengpeng Wu Qian Guo Yuchen Zhao Mengyao Bian Suzhen Cao Junfeng(Jim)Zhang xiaoli duan School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China China North Artificial Intelligence&Innovation Research Institute Beiing 100072China Collective Intelligence&Collaboration Laboratory Beijing 100072China Nicholas School of the Environment and Global Health Institute Duke UniversityDurhamNC 27708USA Duke Kunshan University Kunshan 215316China

Air pollution is a major contributor to the global disease burden,especially affecting respiratory and cardiovascular ***,physical activity is associated with improved lung function,a slower decline in lung function,and lower *** public is more likely to be exposed to air pollution during outdoor physical ***,studies on how long-term and short-term exposure to air pollution interacts with physical activity yield inconsistent results,and the thresholds for air pollution and physical activity remain ***,more studies are needed to provide sufficient evidence to guide the public to safely engage in outdoor physical activity when exposed to air pollution.

关键词： Air pollution Physical activity Interaction Thresholds Exposure

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

Different mechanisms of Eurasian snow cover on precipitation during the early and late pre-rainy season in South China

引用

Science China Earth Sciences 2025年第3期68卷 882-897页

作者： Zhixiang XIAO Anmin duan Yuhang CHEN Chen WEI xiaoli LUO School of Geography and Planning Nanning Normal University State Key Laboratory of Marine Environmental Science College of Ocean and Earth Sciences Xiamen University Guangxi Climate Center

The interannual variability in precipitation during the pre-rainy season(PRS) in South China is significantly correlated with Eurasian snow cover. This study elucidates the distinct mechanisms by which Eurasian snow cover anomalies in March influence precipitation during the early(pre-monsoon) and late(post-monsoon) PRS. In the early PRS, anomalous snow cover in the western region of Eastern Europe(WEE) triggers a southeastward-propagating wave train that impacts Central *** teleconnection pattern induces anomalous cyclonic circulation in Central Asia, which reinforces the midlatitude zonal wind,contributing to the zonal wind wave train pattern towards East Asia. As a result, the East Asian subtropical westerly jet and the western North Pacific subtropical high are enhanced, and the related upper-level divergence, ascending motion, and moisture convergence in South China are intensified, collectively promoting precipitation there. In contrast, during the late PRS, increased snow cover across the eastern sector of Eastern Europe(EEE) and the region east of Lake Baikal(ELB) inhibit South China's precipitation. The wave pattern associated with the EEE(ELB) snow anomaly propagates southeastwards(southwards) to lower latitudes, intensifying the western North Pacific subtropical high. Furthermore, the perturbation stemming from the ELB region induces negative geopotential height anomalies aloft and amplifies the baroclinic anticyclone over the western Pacific. This resulted in prevailing subsidence over South China, which in turn suppresses precipitation during the late PRS. Numerical experiments corroborate the observed circulation adjustments and precipitation responses to snow cover anomalies in the two periods, lending credence to the proposed mechanisms.

关键词： Eurasian snow cover Pre-rainy season South China Wave train

来源：

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

在转换生成语法和萨丕尔-沃尔夫假说之间——论乔治·斯坦纳阐释学翻译理论的源起

引用

中国翻译 2020年第3期41卷 110-117,189页

作者：段小莉上海交通大学人文学院

西方比较文学界泰斗乔治·斯坦纳于2020年2月3日在伦敦逝世、终其一生,斯坦纳著作等身,成果斐然。然而,斯坦纳的学术思想在我国学界受到的关注却相对较少,对其阐释学翻译理论渊源的探究更是鲜有人问津。本文试图立于阐释学翻译理论生成... 详细信息

西方比较文学界泰斗乔治·斯坦纳于2020年2月3日在伦敦逝世、终其一生,斯坦纳著作等身,成果斐然。然而,斯坦纳的学术思想在我国学界受到的关注却相对较少,对其阐释学翻译理论渊源的探究更是鲜有人问津。本文试图立于阐释学翻译理论生成的历史学术语境,从理论动机、学术遭遇、生存空间和运作机制等几个方面挖掘和分析其阐释学翻译理论的源起。研究认为,斯坦纳出于对言语多样性的切身感悟而不能苟同于致力于建构普世语法的“转换生成语法”,但在倾向于“萨丕尔-沃尔夫假说”的同时又不完全接受其理论,阐释翻译理论的建构恰恰完成于与前面两者的对话之中,也借此积淀了大量的理论思想,并在折中主义治学思想下建构出了独特的译学理论。

关键词：乔治·斯坦纳阐释学翻译理论转换生成语法 “萨丕尔-沃尔夫假说”

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：