检索结果-南通市图书馆

High performance electrocoagulation process in treating palm oil mill effluent using high current intensity application

引用

Chinese Journal of Chemical Engineering 2019年第1期27卷 208-217页

作者： Mohd Nasrullah A.W.Zularisam Santhana Krishnan Mimi Sakinah Lakhveer Singh yap wing fen Faculty of Engineering Technology Universiti Malaysia Pahang(UMP) Department of Biological and Ecological Engineering Oregon State University Department of Physics Faculty of ScienceUniversiti Putra Malaysia(UPM)

Electrocoagulation process using high current intensity to treat palm oil mill effluent(POME) was investigated in this *** operating parameters such as electrolysis time, inter-electrode distance and initial pH were carried out to determine the efficient process condition on the removal of chemical oxygen demand(COD),biological oxygen demand(BOD) and suspended solids(SS).The highest treatment was achieved at 50 min with the removal efficiencies for COD, BOD and SS obtained as 85%, 83%, and 84%, *** than 50 min treatment showed the fluctuated trends of removal efficiencies which can be considered *** application of higher current resulted in higher removals of organics while the gas bubbles also assisted in removing the pollutant particles by *** an inter-electrode distance study, the removal efficiency decreased when inter-electrode distance was either higher or lower than 10 mm due to the increase of solution resistance and the decrease of anode active surface *** initial pH study, it was found that high removal efficiencies were achieved in slightly acidic POME sample rather than in neutral or basic *** electrocoagulation process by using the optimum operating parameters was able to remove COD, BOD and SS up to 95%, 94% and 96% *** experimental results confirm that application of high current intensity in electrocoagulation provided high treatment efficiency at a reduced reaction time.

关键词： Electrochemistry Environment Electrocoagulation Palm oil mill effluent High current intensity

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

Evidence of Cu（Ⅱ） Ion Interaction in Crosslinked Chitosan Thin Film from X-Ray Photoelectron Spectroscopy and Field Emission Scanning Electron Microscopy

引用

材料科学与工程（中英文B版） 2011年第5期1卷 584-590页

作者： yap wing fen Mat Yunus Wan Mahmood Department of Physics Faculty of Science Universiti Putra Malaysia UPM Serdang 43400 Selangor Malaysia

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

Characterization of the Optical Properties of Heavy Metal Ions Using Surface Plasmon Resonance Technique

引用

Optics and Photonics Journal 2011年第3期1卷 116-123页

作者： yap wing fen W. Mahmood Mat Yunus 不详

The aim of this research is to characterize the optical properties of heavy metal ions (Hg2+, Cu2+, Pb2+ and Zn2+) using surface plasmon resonance (SPR) technique. Glass cover slips, used as substrates were coated with a 50 nm gold film using sputter coater. The measurement was carried out at room temperature using Kretchmann SPR technique. When the air medium outside the gold film is changed to heavy metal ions solution, the resonance angle shifted to the higher value for all samples of heavy metal ions solution. By our developed fitting program (using Matlab software), the experimental SPR curves were fitted to obtain the refractive index of Hg2+, Cu2+, Pb2+ and Zn2+ ions solution with different concentrations. Both the real and imaginary part of refractive index of the heavy metal ions solution increased with the concentration. The results give the basic idea such that the SPR technique could be used as an alternative optical sensor for detecting heavy metal ions in solution.

关键词： Surface Plasmon Resonance Optical Properties Heavy Metal Ions

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

Arsenic Detection Using Surface Plasmon Resonance Sensor With Hydrous Ferric Oxide Layer

引用

Photonic Sensors 2022年第3期12卷 30-37页

作者： Yasmin MUSTAPHA KAMIL Sura Hmoud AL-REKABI Muhammad Hafiz ABU BAKAR yap wing fen Husam Abduldaem MOHAMMED Nor Hafizah MOHAMED HALIP Mohammed Thamer ALRESHEEDI Mohd Adzir MAHDI inLAZER Dynamics Sdn Bhd InnoHub UnitPutra Science ParkUniversiti Putra MalaysiaSerdang 43400Malaysia Electrical Engineering Department Al Suwayrah Technical InstituteMiddle Technical UniversityBaghdad 10074Iraq Wireless and Photonic Networks Research Centre Faculty of EngineeringUniversiti Putra MalaysiaSerdang 43400Malaysia Institute of Advanced Technology Universiti Putra MalaysiaSerdang 43400Malaysia Department of Physics Faculty of ScienceUniversiti Putra MalaysiaSerdang 43400Malaysia Electronic and Communication Engineering Department College of EngineeringUniversity of BaghdadBaghdad 10071Iraq Department of Electrical Engineering College of EngineeringKing Saud UniversityRiyadh 11421Kingdom of Saudi Arabia

The lethality of inorganic arsenic(As)and the threat it poses have made the development of efficient As detection systems a vital *** research work demonstrates a sensing layer made of hydrous ferric oxide(Fe_(2)H_(2)O_(4))to detect As(Ⅲ)and As(Ⅴ)ions in a surface plasmon resonance *** sensor conceptualizes on the strength of Fe_(2)H_(2)O_(4) to absorb As ions and the interaction of plasmon resonance towards the changes occurring on the sensing *** sensitivity values for As(Ⅲ)and As(Ⅴ)were 1.083°·ppb^(–1) and 0.922°·ppb^(-1),respectively,while the limit of detection for both ions was 0.6 *** findings support the feasibility and potential of the sensor configuration towards paving future advancement in As detection systems.

关键词： Surface plasmon resonance di-iron trioxide hydrate arsenic heavy metals ion optical sensor

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

Prevalence and risk factors of depression among patients with perianal fistulizing Crohn’s disease

引用

World Journal of Psychiatry 2024年第5期14卷 715-725页

作者： Jing Li wing-Yi Ng Li-Chao Qiao fen Yuan Xing Lan Li-Bei Zhu Bo-Lin Yang Zhong-Qiu Wang Department of Radiology Jiangsu Province Hospital of Chinese Medicine Affiliated Hospital of Nanjing University of Chinese MedicineNanjing 210029Jiangsu ProvinceChina Department of Acupuncture and Rehabilitation Jiangsu Province Hospital of Chinese Medicine Affiliated Hospital of Nanjing University of Chinese MedicineNanjing 210029Jiangsu ProvinceChina Department of Colorectal Surgery Jiangsu Province Hospital of Chinese Medicine Affiliated Hospital of Nanjing University of Chinese MedicineNanjing 210029Jiangsu ProvinceChina

BACKGROUND Psychological distress,especially depression,associated with perianal fistulizing Crohn’s disease(PFCD)is widespread and ***,there is a surprising paucity of studies to date that have sought to identify the prevalence and risk factors of depression associated with *** To estimate the prevalence of depressive symptoms and investigate the depression-related risk factors in patients with *** The study was conducted in the form of survey and clinical data collection via questionnaire and specialized medical *** symptoms,life quality,and fatigue severity of patients with PFCD were assessed by Patient Health Questionnaire-9,Inflammatory Bowel Disease Patient Quality of Life Questionnaire(IBDQ),and Inflammatory Bowel Disease(IBD)Fatigue Patient Self-assessment *** basic demographic information,overall disease features,perianal clinical information,and laboratory inflammation indicators were also *** regression analysis was ultimately used to ascertain the risk factors of depression associated with *** A total of 123 patients with PFCD were involved,and 56.91%were suffering from *** to multivariate logistic regression analysis,Perianal Disease Activity Index(PDAI)score[odds ratio(OR)=0.69,95%confidence interval(CI):0.50 to 0.95],IBDQ score(OR=0.93,95%CI:0.88 to 0.97),modified Van Assche index(OR=1.24,95%CI:1.01 to 1.53),and IBD Fatigue score(OR=1.72,95%CI:1.23 to 2.42)were independent risk factors of depression-related prevalence among patients with PFCD(P<0.05).Multiple linear regression analysis revealed that the increasing perianal modified Van Assche index(βvalue=0.166,95%CI:0.02 to 0.31)and decreasing IBDQ score(βvalue=-0.116,95%CI:-0.14 to-0.09)were independently associated with the severity of depression(P<0.05).CONCLUSION Depressive symptoms in PFCD patients have significantly high *** score,modified Van Assche index,quality of life,and fatigue severity

关键词： Crohn’s disease Fistula Depression Inflammatory bowel diseases Risk factors

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

NUMERICAL INVESTIGATION OF TURBULENT COUNTER-GRADIENT-TRANSPORT IN ASYMMETRIC FLOW WITH A JET

引用

Journal of Hydrodynamics 2004年第2期16卷 115-123页

作者： QIUXiang GUOHui-fen LIUYu-lu ShanghaiInstituteofAppliedMathematicsandMechanics ShanghaiUniversityShanghai200072Chinae-mailylliu@yc***

By using the Reynolds Stress Closure Model (RSM), turbulentCounter-Gradient-Transport (CGT) phenomenon was numerically investigated in asymmetric flow with ajet, and the computational results were compared with experimental data. The computational resultsshow that the negative turbulent energy production only appears at some certain stations in CGTregion, this fact indicates that the CGT phenomenon exists more widely than the negative turbulentenergy production; while the CGT region exists all along, it gradually shrinks in the favorablepressure gradient zone until the position of the wing central part is reached, where it vanishes,but it appears in the adverse pressure gradient region; in addition, the location in the flow whereuv = 0 switched sides, relative to where partial deriv U/partial deriv y = 0, from favorablepressure gradient to adverse pressure gradient. The pressure gradient takes an important effect onthe region of negative turbulent energy production and CGT.

关键词： counter-gradient transport (CGT) reynolds stress model (RSM) wall jet pressure gradient

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

Vegetation Cover Variation in the Qilian Mountains and its Response to Climate Change in 2000-2011

引用

Journal of Mountain Science 2013年第6期10卷 1050-1062页

作者： DENG Shao-fu YANG Tai-bao ZENG Biao ZHU Xi-fen XU Hao-jie Key Laboratory of Western China’s Environmental System (Ministry of Education) Research School of Arid Environment & Climate Change Lanzhou University Institute of Glaciology and Ecogeography College of Earth and Environmental Sciences Lanzhou University Geological Team No. 135 Sichuan Bureau of Coal Geology

An understanding 0f variati0ns in vegetati0n c0ver in resp0nse t0 climate change is critical f0r predicting and managing future terrestrial ec0system dynamics. Because scientists anticipate that m0untain ec0systems will be m0re sensitive t0 future climate change c0mpared t0 0thers, 0ur 0bjectives were t0 investigate the impacts 0f climate change 0n variati0n in vegetati0n c0ver in the Qilian M0untains （QLM）, China, between 2000 and 2011. T0 acc0mplish this, we used linear regressi0n techniques 0n 250-m MODIS N0rmalized Difference Vegetati0n Index （NDVI） datasets and mete0r0l0gical rec0rds t0 determine spati0temp0ral variability in vegetati0n c0ver and climatic fact0rs （i.e. temperature and precipitati0n）. Our results sh0wed that temperatures and precipitati0n have increased in this regi0n during 0ur study peri0d. In additi0n, we f0und that gr0wing seas0n mean NDVI was mainly distributed in the vertical z0ne fr0m 2,700 m t0 3,600 m in elevati0n. In the study regi0n, we 0bserved significant p0sitive and negative trends in vegetati0n c0ver in 26.71% and 2.27% 0f the vegetated areas. C0rrelati0n analyses indicated that rising precipitati0n fr0m May t0 August was resp0nsible f0r increased vegetati0n c0ver in areas with p0sitive trends in gr0wing seas0n mean NDVI. H0wever, there was n0 similar significant c0rrelati0n between gr0wing seas0n mean NDVI and precipitati0n in regi0ns where vegetati0n c0ver declined thr0ugh0ut 0ur study peri0d. Using spatial statistics, we f0und that veeetati0n c0ver freauentlvdeclined in areas within the 2,500-3,100 m vertical z0ne, where it has steep sl0pe, and is 0n the sunny side 0f m0untains. Here, the p0sitive influences 0f increasing precipitati0n c0uld n0t 0ffset the drier c0nditi0ns that 0ccurred thr0ugh warming trends. In c0ntrast, in higher elevati0n z0nes （3,900-4,500 m） 0n the shaded side 0f the m0untains, rising temperatures and increasing precipitati0n impr0ved c0nditi0ns f0r vegetati0n gr0wth. Increased precipitati0n als0 faci

关键词： NDVI Temperature Precipitation Topography

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

低雷诺数下小展弦比机翼的气动力优化设计

引用

空气动力学学报 2009年第4期27卷 462-468页

作者：刘洁翁培奋丁珏上海大学应用数学与力学研究所上海200072

以固定翼式微型飞行器为研究背景,针对小展弦比机翼,将遗传算法与Navier-Stokes方程数值解法相结合,提出了一种以实数编码为基础的数值优化模型。流场数值模拟采用人工压缩方法,遗传算法采用锦标赛选择、自适应交叉和变异操作算子,对微... 详细信息

以固定翼式微型飞行器为研究背景,针对小展弦比机翼,将遗传算法与Navier-Stokes方程数值解法相结合,提出了一种以实数编码为基础的数值优化模型。流场数值模拟采用人工压缩方法,遗传算法采用锦标赛选择、自适应交叉和变异操作算子,对微型飞行器机翼选取五个设计点分别进行了升阻比优化设计。优化结果表明,本文的优化模型具有较高的搜索效率和显著的优化效果,五个设计点机翼的升阻比均提高30%以上。优化后的翼面接近椭圆形状,翼型前缘钝厚,尾缘向上拱起,这种形状能大大增加升力,降低诱导阻力,从而显著提高机翼的气动性能。

关键词：微型飞行器遗传算法低雷诺数小展弦比人工压缩方法

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

微型飞行器小展弦比机翼的低雷诺数气动力特性分析

引用

空气动力学学报 2005年第1期23卷 57-67页

作者：杨爱明翁培奋上海大学

以固定机翼式微型飞行器的气动设计为研究背景 ,对小展弦比薄机翼的低雷诺数气动力特性进行了数值分析。不可压粘性绕流的求解采用了人工压缩性方法 ,其中对流项的离散应用了三阶迎风格式。湍流模型为Bald win Barth一方程模型。一无弯... 详细信息

以固定机翼式微型飞行器的气动设计为研究背景 ,对小展弦比薄机翼的低雷诺数气动力特性进行了数值分析。不可压粘性绕流的求解采用了人工压缩性方法 ,其中对流项的离散应用了三阶迎风格式。湍流模型为Bald win Barth一方程模型。一无弯度薄翼的数值计算结果表明本文的数值方法是成功的。通过数值分析 ,揭示了弯度和展弦比对气动力特性的影响。

关键词：机翼微型飞行器低雷诺数气动力特性展弦比迎风格式气动设计人工压缩性流动结构求解

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

基于Euler方程的二维高速海面效应数值分析

引用

空气动力学学报 2008年第1期26卷 67-72页

作者：杨爱明翁培奋上海大学上海市应用数学和力学研究所上海200072

以近海面飞行器的海面效应为研究背景,通过数值求解可压缩Euler方程模拟了波形壁对翼型高亚声速气动力特性的影响。计算网格布局采用了重叠网格方法,避免了翼型与波形壁之间网格生成的困难。详细分析了波形壁边界条件,给出了正确的通量... 详细信息

以近海面飞行器的海面效应为研究背景,通过数值求解可压缩Euler方程模拟了波形壁对翼型高亚声速气动力特性的影响。计算网格布局采用了重叠网格方法,避免了翼型与波形壁之间网格生成的困难。详细分析了波形壁边界条件,给出了正确的通量计算公式。时间推进方法采用了双时间方法,子迭代过程由LU-SGS方法完成。通过数值分析,给出了飞行高度、波长和波幅等因素对翼型气动力特性的影响。

关键词：海面效应重叠网格双时间方法边界条件亚声速

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：