检索结果-南通市图书馆

Effect of Intake Air Humidification and EGR on Combustion and Emission Characteristics of Marine Diesel Engine at Advanced Injection Timing

引用

Journal of Thermal Science 2021年第4期30卷 1174-1186页

作者： wang ke ZHAO Changpu CAI Yujie 300072

The trade-off between NO_(x)-soot and ISFC(Indicated Specific Fuel Consumption)brings new challenges for the development and application of innovative techniques that could reduce the NO_(x)-soot emissions of diesel engine simultaneously with the lowest possible fuel *** this study,the two coupling measures,advanced SOI(start of injection)respectively coupled with intake air humidification(IAH)and EGR,were used to achieve lower NO_(x)-soot emissions than the original engine while minimizing the increase in *** studies were conducted on a four-stroke supercharged intercooled marine diesel engine under 75%loads at 1350 r/min by using AVL Fire *** advanced SOI varied from 14.5°CA BTDC to 20°CA BTDC;humidity ratio ranged from 0 to 100%in increments of 20%,and EGR rate ranged from 0 to 25%in increments of 5%.The technical route to achieve Tier III emission standards was also analyzed in this *** result indicates that lower in-cylinder pressure,temperature and NO_(x)emissions,higher ISFC and soot emissions are observed when only IAH or EGR technology is applied,while opposite trends are found when only using advanced *** proper combination of different SOI respectively with humidity ratio and EGR rate can improve the trade-off relationship between NO_(x)and ***,the increase in ISFC is improved by using advanced SOI under high EGR rate or humidity *** with the advanced SOI coupled with EGR,advanced SOI coupled with IAH results in less loss of *** results reveal that both above-mentioned coupling measures can achieve low NO_(x)-soot emissions while ensuring that ISFC does not *** expected,there are nine combinations of advanced SOI coupled EGR that can achieve NO emissions to meet the Tier III standard,while advanced SOI coupled IAH has only one combination to meet this regulation.

关键词： intake air humidification EGR advanced SOI NO_(x)-soot emissions ISFC TierⅢ

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

Limiting current oxygen sensor based on Y,In co-doped SrTiO_(3)as a dense diffusion barrier layer

引用

Nano Research 2022年第6期15卷 4880-4885页

作者： ke Shan Zhongzhou Yi Jing wang College of Science Honghe UniversityMengzi 661199China

A novel dense diffusion barrier material(Y_(x)Sr_(1−x)Ti_(0.9)In_(0.1)O_(3−δ)(x=0.03,0.05,0.07))was prepared by using a sol-gel *** crystal structure,microstructures,electrical conductivity and ionic conductivity of barrier material were *** results show that the samples exhibit the formation of cubic perovskite structure *** increase of Y-doping amount on A-site improved electrical conductivity and sinterability of materials.A limiting current oxygen sensor based on Y_(0.07)Sr_(0.97)Ti_(0.9)In_(0.1)O_(3–δ)as a dense diffusion barrier shows excellent sensing *** linear relationship between limiting current logIL and 1000/T can described logIL=4.603,8−3.847,5·1,000/*** 750°C,0.25%≤x(O_(2))≤5.0%,the linear relationship between limiting current(IL)and oxygen amount(x(O_(2)))can described as I_(L)=7.047,6+3.875,1·x(O_(2)).

关键词： limiting current oxygen sensor dense diffusion barrier strontium titanate mixed conductivity

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

Prediction of the local and total thermal insulations of a bedding system based on the 3D virtual simulation technology

引用

Building Simulation 2023年第8期16卷 1467-1480页

作者： Qing Zheng Hongbo wang Ying ke School of Textile Science and Engineering Jiangnan UniversityWuxi 214122China School of Design Jiangnan UniversityWuxi 214122China

The thermal insulation of a bedding system is one of the most critical factors affecting sleeping thermal *** study reported a mathematical model to evaluate both local and total thermal insulations of a bedding *** determine the geometric parameters in the model,the geometric model of the bedding system was developed using a 3D virtual simulation *** reliability was validated by comparing it with the 3D scanning *** predicted local and total thermal insulations of bedding systems were compared with those measured by the thermal manikin obtained in a previous *** bedding systems included six down quilts with different filling weights and involved three body *** results showed that the predicted thermal insulation values agreed well with the experimental *** predicted local and total thermal insulations were with acceptable accuracy,whose errors were within 20%and 10%,***,the research discussed the effects of two main parameters(i.e.,the proportions and partial thermal resistances of heat transfer parts)on bedding thermal insulations and provided practical suggestions for regulating bedding thermal *** study has important implications for evaluating the thermal comfort of the bedding system and contributes to improving the sleeping environment.

关键词： thermal insulation prediction model bedding system heat transfer virtual simulation

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

Modelling ignition probability with pairwise mixing-reaction model for flame particle tracking

引用

Chinese Journal of Aeronautics 2021年第5期34卷 523-534页

作者： Qing XIE Zhuyin REN ke wang School of Aerospace Engineering Tsinghua UniversityBeijing 100084China Institute for Aero Engine Tsinghua UniversityBeijing 100084China Aero Engine Academy of China Beijing 101300China

Reduced order models for ignition analysis can offer insights into ignition processes and facilitate the combustor *** this study,a Pairwise Mixing-Reaction(PMR)model is formulated to model the interaction between the flame particle and the surrounding cell mixture during Lagrangian flame particle ***,the model accounts for the two-way coupling of mass and energy between the flame particle and the surrounding shell layer by modelling the corresponding turbulent mixing,chemical reaction and evaporation process if *** state of a flame particle,e.g.,burnt,hot gas or extinguished,is determined based on particle *** model can properly describe the ignition process with a spark kernel being initiated in a nonflammable region,which is of practical importance in certain turbine engines and has not been rigorously accounted for by the existing models based on the estimation of local Karlovitz *** model is integrated into an ignition probability analysis platform and is demonstrated for a methane/air bluff-body flame with the flow and fuel/air mixing characteristics being extracted from a non-reacting *** results show that for the spark location being at the extreme fuellean outer shear layer of the recirculation zone,PMR can yield ignition events with a significant number of active flame *** mechanisms for the survival of the initial flame particles and the entrainment of the survived flame particles into the recirculation zone are *** results also show that the ignition probability map from PMR agrees well with the experimental observation:a high ignition probability in the shear layer of the recirculation zone near the mean stoichiometric surface,and low ignition probabilities inside the recirculation zone and the top stagnation region of the recirculation *** parametric study shows that the predicted shape of the ignition progress factor and ignition probability is in general inse

关键词： Bluff-body stabilized flame Igniting process Ignition probability Lagrangian particle tracking Pairwise mixing-reaction

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

Characteristics Analysis of Condensation outside Horizontal Tube Bundles and Novel Condensation Enhancement Method

引用

Journal of Thermal Science 2022年第3期31卷 934-945页

作者： LI Nianqi TIAN ke ke Hanbing ZENG Min wang Qiuwang key Laboratory of Thermo-Fluid Science and Engineering Ministry of EducationXi’an Jiaotong UniversityXi’an710049China key Lab on Steam Power System Wuhan Second Ship Design and Research InstituteWuhan430025China

Condensation is a phase-change heat-transfer phenomenon crucial in many industries involving latent heat release and mass ***-and-tube condensers are essential contributors to the condensation process,and their tube bundles serve as a ***,the thermal-hydraulic characteristics of condensation in a longitudinal-flow shell-and-tube condenser were investigated *** shell-side longitudinal-flow condensation on the horizontal tube bundles was studied considering inlet flow rate,overheating temperature,and non-condensable *** pressure drops and heat transfer coefficients were subdivided into several components to provide further ***-phase interface behavior analyses were conducted to demonstrate the outcomes with respect to the non-condensable gas layer,vapor quality,and non-condensable gas *** on the thorough quantitative analyses outlined above,the thermal resistance of the condensation on the horizontal tube bundle was *** thermal resistance outside the tube was found to dominate the condensation ***,hexagon clamping baffles(HCBs)were introduced as a novel solution to impair condensate boundary layers and provide perturbations to intensify condensation heat *** results revealed that the HCBs enhanced the total heat transfer coefficients by 8.1%–40.7%while reducing the critical overheating temperature and the threshold ratio between sensible and latent heat.

关键词： shell-and-tube condenser film condensation non-condensable gas thermal resistance analysis

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

Amination of electron deficient aryl chlorides promoted by nano sized Mg(OH)_2 under transition metals free condition

引用

Chinese Chemical Letters 2012年第2期23卷 137-140页

作者： zhi Hao Cui Zi Hui Meng Yan Qing Mi Peng wang Qi wang Lin Man Zhao ke Jian Cui Fang Yu zhi Bin Xu Department of Applied Chemistry and Pharmaceuticals Beijing Institute of TechnologyBeijing 100081China

This paper presents the amination reactions of electron deficient aryl chlorides promoted by Mg（OH）_2 without transition metals. Only using stoichiometric amount of nano sized Mg（OH）_2,good to moderate isolated yi... 详细信息

关键词： Anination Electron deficient aryl chloride Cyclic secondary amines Nano sized Magnesium hydroxide

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

Tau hyperphosphorylation induces apoptotic escape and triggers neurodegeneration in Alzheimer's disease

引用

Neuroscience Bulletin 2014年第2期30卷 359-366页

作者： Jian-zhi wang zhi-Hao wang Qing Tian Department of Pathology and Pathophysiology Key Laboratory of Ministry of Education of China for Neurological DisordersTongji Medical College Huazhong University of Science and Technology

Since abnormal post-translational modifications or gene mutations of tau have been detected in over twenty neurodegenerative disorders, tau has attracted widespread interest as a target protein. Among its various post-translational modifications, phosphorylation is the most extensively studied. It is recognized that tau hyperphosphorylation is the root cause of neurodegeneration in Alzheimer＇s disease （AD）; however, it is not clear how it causes neurodegeneration. Based on the findings that tau hyperphosphorylation leads to the escape of neurons from acute apoptosis and simultaneously impairs the function of neurons, we have proposed that the nature of AD neurodegeneration is the consequence of aborted apoptosis induced by tau phosphorylation. Therefore, proper manipulation of tau hyperphosphorylation could be promising for arresting AD neurodegeneration. In this review, the neuroprotective and neurodegenerative effects of tau hyperphosphorylation and our thoughts regarding their relationship are presented.

关键词： Alzheimer's disease microtubule-associated protein tau hyperphosphorylaUon apoptosis neurodegeneration

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

Influences of initial porosity,stress triaxiality and Lode parameter on plastic deformation and ductile fracture

引用

Acta Mechanica Solida Sinica 2017年第5期30卷 493-506页

作者： Ying-Song Ma Dong-zhi Sun Florence Andrieux ke-Shi Zhang College of Civil Engineering and Architecture Guangxi UniversityKey Lab of Disaster Prevention and Structural SafetyGuangxi Key Lab Disaster Prevention and Engineering SafetyNanning 530004China Department of Mining Engineering Shanxi Datong UniversityDatong 037003China Fraunhofer Institute for Mechanics of Materials IWM Woehlerstrasse 1179108 FreiburgGermany

Local mechanical properties in aluminum cast components are inhomogeneous as a con- sequence of spatial distribution of microstructure, e.g., porosity, inclusions, grain size and arm spacing of secondary dendrites. In this work, the effect of porosity is investigated. Cast components contain voids with different sizes, forms, orientations and distributions. This is approximated by a porosity distribution in the following. The aim of this paper is to in- vestigate the influence of initial porosity, stress triaxiality and Lode parameter on plastic deformation and ductile fracture. A micromechanical model with a spherical void located at the center of the matrix material, called the representative volume element （RVE）, is de- veloped. Fully periodic boundary conditions are applied to the RVE and the values of stress triaxiality and Lode parameter are kept constant during the entire course of loading. For this purpose, a multi-point constraint （MPC） user subroutine is developed to prescribe the loading. The results of the RVE model are used to establish the constitutive equations and to further investigate the influences of initial porosity, stress triaxiality and Lode parameter on elastic constant, plastic deformation and ductile fracture of an aluminum die castin~ alloy.

关键词： Stress triaxialityLode parameterVoidDuctile fractureRVE

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

Tau-Induced Ca^(2+)/Calmodulin-Dependent Protein Kinase-IV Activation Aggravates Nuclear Tau Hyperphosphorylation

引用

Neuroscience Bulletin 2018年第2期34卷 261-269页

作者： Yu-Ping Wei Jin-wang Ye Xiong wang Li-Ping Zhu Qing-Hua Hu Qun wang Dan ke Qing Tian Jian-zhi wang Pathophysiology Department Tongji Medical CollegeHuazhong University of Science and Technology key Laboratory of Ministry of Education for Neurological Disorders and Hubei Provincial key Laboratory for Neurological Disorders Tongji Medical College Huazhong University of Science and Technology

Hyperphosphorylated tau is the major protein component of neurofibrillary tangles in the brains of patients with Alzheimer’s disease(AD). However, the mechanism underlying tau hyperphosphorylation is not fully understood. Here, we demonstrated that exogenously expressed wild-type human tau40 was detectable in the phosphorylated form at multiple AD-associated sites in cytoplasmic and nuclear fractions from HEK293 *** these sites, tau phosphorylated at Thr205 and Ser214 was almost exclusively found in the nuclear fraction at the conditions used in the present study. With the intracellular tau accumulation, the Ca2+concentration was significantly increased in both cytoplasmic and nuclear fractions. Further studies using site-specific mutagenesis and pharmacological treatment demonstrated that phosphorylation of tau at Thr205 increased nuclear Ca2+concentration with a simultaneous increase in the phosphorylation of Ca2+/calmodulin-dependent protein kinase IV(Ca MKIV) at Ser196. On the other hand, phosphorylation of tau at Ser214 did not significantly change the nuclear Ca2+/Ca MKIV signaling. Finally, expressing calmodulin-binding protein-4 that disrupts formation ofthe Ca2+/calmodulin complex abolished the okadaic acidinduced tau hyperphosphorylation in the nuclear *** conclude that the intracellular accumulation of phosphorylated tau, as detected in the brains of AD patients, can trigger nuclear Ca2+/Ca MKIV signaling, which in turn aggravates tau hyperphosphorylation. Our findings provide new insights for tauopathies: hyperphosphorylation of intracellular tau and an increased Ca2+concentration may induce a self-perpetuating harmful loop to promote neurodegeneration.

关键词： Alzheimer’s disease Tau Phosphorylation Nuclear calcium signal CaMKIV

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

Coset Structure of Spin Group

引用

Communications in Theoretical Physics 2007年第6期47卷 987-994页

作者： wang Na WU ke School of Mathematical Science Capital Normal University Beijing 100037 China key Laboratory of Mathematics Mechanization The Chinese Academy of Sciences Beijing 100080 China

This article considers One example is also given to take a the coset structure closer look at what of spin group via analyzing the expression of its representation. the coset and the subgroup are.

关键词： spin group group representation coset structure

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：