检索结果-南通市图书馆

Numerical Modelling of Electroosmotic Driven Flow in Nanoporous Media by Lattice Boltzmann Method

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

Journal of Bionic Engineering 2013年第1期10卷 90-99页

作者： Bo Li wenning zhou Yuying Yan Zhiwu Han Luquan Ren Energy and Sustainability Research Division Faculty of Engineering University of Nottingham Nottingham NG7 2RD UK Key Laboratory of Bionic Engineering (Ministry of Education China) Jilin University Changchun 130022 P. R. China

The lattice Boltzmann method was employed to simulate electroosmotic driven flow and Debye layer screening in con- ducting electrolyte around a porous structure with average size of 40 nm. The charge screening around the nanopores was investigated by solving the vector-superpositioned potential equilibrium distribution function and adding electro-kinetic force term to the evolution equation. In this intermediate case of moderate Debye length, the electrophoresis problem becomes complicated. The motion of the particles distorts the screening cloud, which becomes asymmetric, resulting in very complex interactions between the electrolyte, the screening cloud and the particle; but the Electroosmotic Flow （EOF） behaviour was still considered based on the Helmoholtz-Smoluchowski model with adaptation to fit nanoporous flow in the porous structure. In the present approach, the flow in the nanopores is directly modelled; the detailed flow information can be obtained by simplifying the repeated macrostructure. Due to the symmetry of the domain, the size of computational domain can be largely reduced by less repeated spherical nanoparticles. Each pore of the medium contains several lattice nodes on the simplified curved edges and potential gradients are produced by adjusting the zeta potential value. The velocity results for pressure-driven and EOF flows agree well with the analytical solutions and recent experimental results. In particular, the interface between solid particles and fluids, the influences of porosity, solid particle diameter, yield stress and electric parameters in EOF were investigated. The anti-adhesion effect of electroosmotic pumping effect was evaluated, and the pulsed DC was applied in order to enhance the performance of the electroosmotic pumping. The results demonstrate that the present lattice Boltzmann model is capable of modelling flow through nanoporous media at certain restrictions while some results deviate from the predictions based on the macr

关键词： electroosmotic flow electroosmotic pumping nanoporous media lattice Boltzmann method numerical modelling,anti-adhesion

基于风险因子评价的沼液对小麦安全利用阈值研究

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

中国沼气 2024年第1期42卷 60-69页

作者：胡小山孟登辉彭轮丁健余天雨孟留洋周文宁童佳峰刘明月闫丙建刘龙河南牧原生态环境科技有限公司河南南阳473000 牧原食品股份有限公司河南南阳473000

建立沼液安全施用研究方法,探究沼液在不同酸度的土壤中对小麦作物的安全施用阈值,为沼液安全利用提供依据。分析沼液成分,通过室内盆栽试验和田间试验确定对小麦生长产生抑制作用的组分,进而确定各成分最高浓度。结果说明:1)挥发性脂肪... 详细信息

建立沼液安全施用研究方法,探究沼液在不同酸度的土壤中对小麦作物的安全施用阈值,为沼液安全利用提供依据。分析沼液成分,通过室内盆栽试验和田间试验确定对小麦生长产生抑制作用的组分,进而确定各成分最高浓度。结果说明:1)挥发性脂肪酸(VFAs)在酸性土壤、无机离子在碱性土壤对小麦生长的抑制作用更为明显;2)VFAs主要以分子形式抑制小麦生长,VFAs在小麦分蘖期比越冬期更明显抑制小麦生长,温度高促进VFAs水解为分子;3)由于碱性土具有更强的保盐能力,小麦生长易受无机离子影响;4)无机离子主要成分为氮、磷、钾,按照测土配方施用不影响小麦生长。沼液施用至酸性土壤需控制VFAs浓度,pH值7.5的土壤沼液播后底肥、分蘖期至苗期、分蘖后期、越冬期、返青拔节期追肥的VFAs浓度分别不超过45 mmol·L^(-1)、11 mmol·L^(-1)、23 mmol·L^(-1)、30 mmol·L^(-1)、18 mmol·L^(-1),且土壤pH值越低,VFAs安全浓度越低。

关键词：沼液猪粪挥发性脂肪酸无机离子小麦

The role of strain in oxygen evolution reaction

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第6期93卷 322-344,I0009页

作者： Zihang Feng Chuanlin Dai Zhe Zhang Xuefei Lei wenning Mu Rui Guo Xuanwen Liu Junhua You School of Materials Science and Engineering Northeastern UniversityShenyang 110819LiaoningChina School of Materials Science and Technology Shenyang University of TechnologyShenyang 110870LiaoningChina

The oxygen evolution reaction(OER)is a crucial step in metal-air batteries and water splitting technologies,playing a significant role in the efficiency and achievable heights of these two ***,the OER is a four-step,four-electron reaction,and its slow kinetics result in high overpotentials,posing a *** address this issue,numerous strategies involving modified catalysts have been proposed and proven to be highly *** these strategies,the introduction of strain has been widely reported because it is generally believed to effectively regulate the electronic structure of metal sites and alter the adsorption energy of catalyst surfaces with reaction ***,strain has many other effects that are not well known,making it an important yet unexplored *** on this,this review provides a detailed introduction to the various roles of strain in *** better explain these roles,the review also presents the definition of strain and elucidates the potential mechanisms of strain in OER based on the d-band center theory and adsorption volcano ***,the review showcases various ways of introducing strain in OER through examples reported in the latest literature,aiming to provide a comprehensive perspective for the development of strain ***,the review analyzes the appropriate proportion of strain introduction,compares compressive and tensile strain,and examines the impact of strain on *** the review offers prospects for future research directions in this emerging field.

关键词： Oxygen evolution reaction Strain generation Tensile strain Compressive strain Strain mechanism Strain effects

在线全文

学校读者我要写书评

暂无评论

对高校思想政治工作创新的思考

安康师专学报 2005年第5期17卷 91-94页

作者：周文宁长安大学建筑学院陕西西安710061

随着时代发展,高校思想政治工作面临着许多新情况、新问题,加强和改进高校思想政治工作,必须适应新形势,充分认识工作创新的迫切性和必要性,以全新的思路和全新的机制,通过全新的方法、手段,用全新的内容来教育学生,使高校思想政治工作... 详细信息

随着时代发展,高校思想政治工作面临着许多新情况、新问题,加强和改进高校思想政治工作,必须适应新形势,充分认识工作创新的迫切性和必要性,以全新的思路和全新的机制,通过全新的方法、手段,用全新的内容来教育学生,使高校思想政治工作与时俱进,达到培养德智体美全面发展的社会主义合格建设者和可靠接班人的目标。

关键词：高等学校思想政治工作创新

Analysis of the Peripheral Blood Helper T-Cell 17- Cell Level and Monocyte/Lymphocyte Ratio for Colorectal Cancer Prognosis Prediction

在线全文

学校读者我要写书评

暂无评论

Proceedings of Anticancer Research 2024年第3期8卷 133-137页

作者： Xiang Ye wenning Mi Hospital 960 Joint Logistic Support ForceJinan 250000China

Objective: To investigate the value of peripheral blood helper T cell 17 cell level and monocyte/lymphocyte ratio to predict the prognosis of colorectal cancer patients. Methods: 74 colorectal cancer patients who attended Hospital 960 from January 2021 to January 2022 were retrospectively analyzed. Clinical data of the patients were collected, including gender, age, and histologic type. Immunohistochemical indexes such as Th17 cell level and monocyte/ lymphocyte ratio in the peripheral blood of patients were also collected. The prognosis of patients after treatment, as well as peripheral blood Th17 and MLR levels, were observed and analyzed. Results: After follow-up after treatment, in the final 74 patients, the prognosis was good in 32 patients, accounting for 43.24%, and the prognosis was bad in 42 patients, accounting for 56.76%. There were no significant differences between the average age and tumor diameters of the good prognosis and poor prognosis groups (P > 0.05). However, the TNM staging, intervention taken, differentiation degree, presence of distant metastasis, presence of lymph node metastasis, Th17 level, and MLR level are significantly different between the two groups (P < 0.05). Conclusion: Peripheral blood Th17 and MLR have predictive value for the prognosis of colorectal cancer patients, and high levels of peripheral blood Th17 and MLR imply poor prognosis. The detection of peripheral blood Th17 and MLR levels is simple and convenient and can be used as indicators to provide a reference for the prognostic assessment of colorectal cancer patients.

关键词： Helper T cell 17 cells Monocyte/lymphocyte ratio Colorectal cancer

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

鲁奇炉干馏段内大颗粒煤的热解特性研究

煤炭学报 2019年第S2期44卷 665-672页

作者：霍海龙李钦晔周文宁温治楼国锋刘训良北京科技大学能源与环境工程学院北京100083 冶金工业节能减排北京市重点实验室北京100083

煤热解是煤转换利用的主要方式之一,低阶煤通过热解的方式转化为焦油、焦炉煤气和半焦等产品,大大提高了低阶煤的利用价值。在实际的工业生产中,煤热解所用煤多为大颗粒煤或块煤,挥发分的成分复杂多样,针对这方面的研究相对较少。鲁奇... 详细信息

煤热解是煤转换利用的主要方式之一,低阶煤通过热解的方式转化为焦油、焦炉煤气和半焦等产品,大大提高了低阶煤的利用价值。在实际的工业生产中,煤热解所用煤多为大颗粒煤或块煤,挥发分的成分复杂多样,针对这方面的研究相对较少。鲁奇三段炉作为煤热解常用的设备之一,在工业上广泛应用。以鲁奇炉实际运行工况为依据,基于Merrick提出的热解动力学模型,结合煤颗粒内部的传热建立了大颗粒煤热解的综合数学模型;在综合煤热解动力学模型和气固换热模型的基础上建立了鲁奇炉干馏段内煤热解过程的数学模型。应用所建立的数学模型,研究了大颗粒煤在热解过程中的升温特性、挥发分各组分的释放特性以及鲁奇炉干馏段内挥发分各组分的浓度分布特性。模拟结果显示,对于直径为20 mm的单颗粒煤,热传导为热解的限制性环节,煤粒内外的温差由最初的最大温差67℃逐渐减小,加热1 h后煤颗粒内外温差仅为1.71℃,煤颗粒的挥发分产率达到29.2%,占最终产率的89%;挥发分中各组分的析出规律差异较大,焦油和H 2 O的释放速率约为其他组分的10倍;鲁奇炉干馏段(高度为3 m)煤颗粒的热解主要发生在底部0~1 m,对应的温度区间为350~550℃,在0.25~0.6 m床层段挥发分析出速率较快,对应温度区间为430~500℃。

关键词：热解大颗粒煤鲁奇炉传热传质数学模型

Construction of a bivalent vaccine candidate against HAdV4/HAdV7 based on capsid-display strategy via Red-homologous recombination and counter-selection methodology

在线全文

学校读者我要写书评

暂无评论

Biosafety and Health 2024年第2期6卷 70-79页

作者： Peng Wang Yunting Shao Xichun Yang wenning Zhang Jianguang zhou Fang Huang Shuang Liu Jiping Zheng Chengjun Wu Shanhu Li Department of Cell Engineering Beijing Institute of BiotechnologyBeijing 100850China School of Basic Medical Sciences Faculty of MedicineDalian University of TechnologyDalian 116024China Lab of Microbiological Engineering School of Life and Health SciencesHainan UniversityHaikou 570228China

Human adenoviruses(HAdvs)are major respiratory ***,human adenovirus type 4(HAdV4)and human adenovirus type 7(HAdV7)are known for causing fever and pneumonia,with docu-mented cases of fatalities among the *** recent years,HAdV4/HAdv7 has been implicated in caus-ing substantial outbreaks,leading to increased morbidity in multiple *** HAdV4 and HAdV7 infections have been reported in North America,Asia,Europe,Africa,South America,Oceania,and the Middle *** fatalities occurred in North America(the United States)and Asia(China and Singapore).Engineered recombinant adenoviruses have played a crucial role as vaccine *** this study,we con-structed a recombinant adenovirus,Ad4ITRmut-Ad7E3,and evaluated it in vitro and in *** observed that the replication rate of Ad4ITRmut-Ad7E3 was lower than that of the RI-67 strain,indicating that the mutation of inverted terminal repeats(ITRs)weakened the replication ability of *** of BALB/c mice with the bivalent Ad4ITRmut-Ad7E3 vaccine strain,administered by intraperitoneal injection and oral gavage,resulted in the elicitation of neutralizing antibodies targeting HAdV4 and *** finding not only pro-vides a novel method and technique for the efficient construction of a polyvalent recombinant adenovirus vac-cine candidate against HAdV4 and HAdv7 but also against other prevalent adenovirus serotypes such as HAdV3,HAdV11,HAdV14,and HAdv55,from various regions.

关键词： Bivalent adenovirus vaccine Capsid-display strategy ITRs modification Hexon epitope replacement

工程流体力学“微课-参与式”教学模式探索及实践

在线全文

学校读者我要写书评

暂无评论

力学与实践 2020年第1期42卷 97-102页

作者：罗春欢任玲郭美荣周文宁高婷北京科技大学能源与环境工程学院北京100083

为了进一步加强“新工科”背景下综合型人才的培养,本文以工程流体力学为例,对“微课-参与式”教学模式进行了探索实践研究。探索了新模式下课堂教学内容、教学形式设计及教学实践,创新了教学考核方式。采用比较法和问卷调研对教学效果... 详细信息

为了进一步加强“新工科”背景下综合型人才的培养,本文以工程流体力学为例,对“微课-参与式”教学模式进行了探索实践研究。探索了新模式下课堂教学内容、教学形式设计及教学实践,创新了教学考核方式。采用比较法和问卷调研对教学效果进行了评价,结果表明“微课-参与式”教学激发了学生学习兴趣,提高了课堂参与度,使学生掌握扎实的专业知识,更培养了大家的实践、创新等能力,符合“新工科”复合型人才培养的要求。

关键词：微课参与式教学实践工程流体力学

升温和脉冲充电对锂枝晶生长抑制作用的数值分析

在线全文

学校读者我要写书评

暂无评论

储能科学与技术 2022年第3期11卷 1008-1018页

作者：乔东格刘训良温治豆瑞峰周文宁北京科技大学能源与环境工程学院北京100083

金属锂被认为是具有高理论比容量的电池负极材料。然而,锂枝晶的生长可能会连接正负极导致爆炸等事故。因此,抑制锂枝晶对提高锂电池的安全性至关重要。本工作通过非线性相场模型与热模型耦合,首先探究了不同初始条件下的锂枝晶形貌及... 详细信息

金属锂被认为是具有高理论比容量的电池负极材料。然而,锂枝晶的生长可能会连接正负极导致爆炸等事故。因此,抑制锂枝晶对提高锂电池的安全性至关重要。本工作通过非线性相场模型与热模型耦合,首先探究了不同初始条件下的锂枝晶形貌及其温度场分布。由于反应放热,随着反应的进行,锂枝晶区域的温度高于电解质区域的温度,并在二者界面处形成温度梯度。然后,研究了不同温度下锂枝晶的形貌特征并量化了抑制效果。研究发现,温度越低,充电过程中生成的锂枝晶越长,数目越多,侧枝越多,从而在放电过程中形成“死锂”的可能性越大。通过改变脉冲电流的频率,分析了不同充电频率下的枝晶长度和形貌特征。研究结果表明,5 ms的脉冲之后接10 ms的休息周期是抑制锂枝晶的合适频率,在此频率下可以得到较为均匀的沉积表面。通过探究在不同过电位和扩散系数下的枝晶平均生长速率,引入了一个无量纲数Da来阐明扩散与电极反应之间的竞争关系,得出减小反应速率和扩散速率之间的差距是抑制锂枝晶的必要条件。

关键词：相场模型电沉积锂枝晶脉冲电流温度

维普期刊数据库博看期刊