检索结果-南通市图书馆

Impact of partial slip condition on mixed convection of nanofluid within lid-driven wavy cavity and solid inner body

引用

Propulsion and Power Research 2022年第4期11卷 544-564页

作者： Ammar I.Alsabery Mohammad H.Yazdi Ali S.Abosinnee Ishak Hashim evgeny Solomin Refrigeration&Air-conditioning Technical Engineering Department College of Technical EngineeringThe Islamic UniversityNajafIraq New Materials Technology and Processing Research Center Department of Mechanical EngineeringNeyshabur BranchIslamic Azad UniversityNeyshaburIran Altoosi University College NajafIraq Department of Mathematical Sciences Faculty of Science&TechnologyUniversiti Kebangsaan Malaysia43600Bangi SelangorMalaysia Department of Electric Power Generation Stations Network and Supply SystemsInstitute of Engineering and TechnologySouth Ural State University76Lenin AvenueChelyabinsk454080Russian Federation

In thermofluid systems,the lid-driven square chamber plays an imperative role in analyzing thermodynamics’first and second laws in limited volume cases executed by sheer effects with a prominent role in many industrial applications including electronic cooling,heat exchangers,microfluidic components,solar collectors,and renewable ***,nanofluids as working fluids have demonstrated potential for heat transfer enhancement systems,however there are some concerns about irreversibility problems in the *** to this problem and in line with the applications of partial slip on fluid flow modification and irreversibilities,the present study considers laminar mixed convection and entropy generation analysis of aluminum oxide nanofluid inside a lid-driven wavy cavity having an internal conductive solid body in the presence of a partial slip on the upper surface,which to the best of our knowledge,has not been investigated so *** fundamental equations of the current work with the appropriate boundary conditions are first made dimensionless and then solved numerically using the Galerkin weighted residual *** main parameters of the flow and heat transfer,entropy generation,and Bejan number are presented and explained in *** outcomes indicate that the partial slip is more effective when friction irreversibilities govern the *** the presence of slip condition,the flow circulation changes the trend in the middle of the cavity around the solid block leading to a decrease in the isentropic lines at the dense sections with almost 30%less than the case of no-slip *** is concluded that partial slip shows different trends on the local Nusselt number interface along the wavy wall improving the average Nusselt number where high friction irreversibilities dominate.

关键词： Entropy generation Mixed convection Lid-driven wavy cavity Nanofluid Inner cylinder Partial slip

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

Big Bang?

引用

Journal of High Energy Physics, Gravitation and Cosmology 2023年第4期9卷 964-967页

作者： evgeny A. Novikov BioCircuits Institute University of California San Diego USA

Based on quantum modification of the general relativity (Qmoger) and on recent observations of early galaxies, it is argued that the universe was created not by a singular Big Bang, but by a continuous dynamical process of production of matter/energy from the quantum vacuum. This theory is in quantitative agreement with cosmic data (without fitting parameters) and has broad spectrum of important applications.

关键词： Big Bang Quantum Modification of General Relativity Early Galaxies

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

Special Spectral Approach to Solutions of SISO LTI H-Optimization Problems

引用

International Journal of Automation and computing 2019年第1期16卷 112-128页

作者： evgeny I.Veremey Faculty of Applied Mathematics and Control Processes Saint-Petersburg State University

The paper is devoted to H-optimization problems for linear time invariant(LTI) systems with scalar control, external disturbance and measurement noise. All these problems can be numerically solved with the help of the well-known universal approaches based on Riccati equations, linear matrix inequalities(LMI) or maximum entropy technique. Nevertheless, in our opinion there exists a possibility to increase the computational efficiency of synthesis using a special spectral approach to the above mentioned problems in frequency domain. Some relevant details are discussed and efficient numerical algorithms are proposed for the practical implementation of spectral approach. One of its virtues is a possibility to present optimal solutions in a specific form, which is convenient for investigation.

关键词： Stabilizing controller performance index synthesis H-optimization spectral approach

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

UAV Maneuvering Decision-Making Algorithm Based on Twin Delayed Deep Deterministic Policy Gradient Algorithm

引用

Journal of Artificial Intelligence and Technology 2022年第1期2卷 16-22页

作者： Bai Shuangxia Song Shaomei Liang Shiyang Wang Jianmei Li Bo Neretin evgeny School of Electronics and Information Northwestern Polytechnical UniversityXi’anChina Beijing Electro-Mechanical Engineering Institute BeijingChina Avic Luoyang Electro-optical Equipment Research Institute LuoyangChina School of Robotic and Intelligent Systems Moscow Aviation InstituteMoscowRussia

Aiming at intelligent decision-making of unmanned aerial vehicle(UAV)based on situation information in air combat,a novelmaneuvering decision method based on deep reinforcement learning is proposed in this *** autonomous maneuvering model ofUAV is established byMarkovDecision *** Twin DelayedDeep Deterministic Policy Gradient(TD3)algorithm and the Deep Deterministic Policy Gradient(DDPG)algorithm in deep reinforcement learning are used to train the model,and the experimental results of the two algorithms are analyzed and *** simulation experiment results show that compared with the DDPG algorithm,the TD3 algorithm has stronger decision-making performance and faster convergence speed and is more suitable for solving combat *** algorithm proposed in this paper enables UAVs to autonomously make maneuvering decisions based on situation information such as position,speed,and relative azimuth,adjust their actions to approach,and successfully strike the enemy,providing a new method for UAVs to make intelligent maneuvering decisions during air combat.

关键词： air combat DDPG maneuvering decision-making TD3

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

Mathematical modelling of the progression of active tuberculosis:Insights from fluorography data

引用

Infectious Disease Modelling 2022年第3期7卷 374-386页

作者： Konstantin Konstantinovich Avilov Alexei Alexeevich Romanyukha evgeny Mikhailovich Belilovsky Sergey Evgenevich Borisov Institute for Numerical Mathematics Russian Academy of Sciences8Gubkina Str.Moscow119333Russia Moscow Research and Clinical Center for Tuberculosis Control of the Moscow Government Department of Health 10Stromynka Str.Moscow107076Russia

Little is known about the dynamics of the early stages of untreated active pulmonary tuberculosis:unknown are both the rates of progression and the model“scheme”.The“parallel”scheme assumes that infectiousness of tuberculosis cases is effectively predefined at the onset of the disease,and the“serial”scheme considers all cases to be noninfectious at the onset,with some of them later becoming *** aim was to estimate the progression of the early stages of pulmonary tuberculosis using data from a present-day *** used the routine notification data from Moscow,Russia,2013e2018 that contained the results and time of the last fluorographic screening preceding the detection of tuberculosis *** provided time limits on the duration of untreated *** of TB progression under both models were *** the goodness of fit to the data,we could prefer neither the“parallel”,nor the“serial”model,although the latter had a bit worse *** the other hand,the observed rise in the fraction of infectious tuberculosis cases with the time since the last screening was explained by the“serial”model in a more plausible way e as gradual progression of some cases to ***“parallel”model explained it through less realistic quick removal of non-infectious cases and accumulation of the infectious *** results demonstrate the potential of using such detection data enriched with reassessments of the previous screenings.

关键词： Natural history of tuberculosis(TB) Mathematical modeling Minimal tuberculosis Model structure Fluorographic screening data

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

MFI/MEL分子筛催化甲醇制烯烃反应关键参数的集成方法

引用

Chinese Journal of Catalysis 2022年第7期43卷 1879-1893页

作者： Chuncheng Liu evgeny A.Uslamin Sophie H.van Vreeswijk Irina Yarulina Swapna Ganapathy Bert M.Weckhuysen Freek Kapteijn evgeny A.Pidko 代尔夫特理工大学化学工程系无机系统工程代尔夫特荷兰巴斯夫股份公司工艺研究和化学工程路德维希港德国乌特勒克大学德拜纳米材料科学研究所无机化学与催化乌特勒克荷兰代尔夫特理工大学化工系催化工程系代尔夫特荷兰

了解与关键催化性能参数(如选择性和稳定性)相关的催化剂特性对于合理设计催化剂是非常重要的.本文重点考察了甲醇制烯烃(MTO)过程中MFI、MEL及其共生沸石分子筛的催化行为和构效关系.表征结果表明,丙烯和丁烯的高产率和MeOH的高转化率... 详细信息

了解与关键催化性能参数(如选择性和稳定性)相关的催化剂特性对于合理设计催化剂是非常重要的.本文重点考察了甲醇制烯烃(MTO)过程中MFI、MEL及其共生沸石分子筛的催化行为和构效关系.表征结果表明,丙烯和丁烯的高产率和MeOH的高转化率均与Pentasil分子筛结构中晶格Al位的富集相关,这也被27Al MAS NMR结果和3-甲基戊烷裂解结果证实.催化剂对MTO反应的催化性能与其晶体尺寸、外部B酸中心和铝配对等性质之间缺乏相关性,表明它们对提高丙烯选择性的作用不大.本文分析表明,催化剂失活非常复杂,受交叉点处晶格铝富集、总铝含量和晶体尺寸影响较大,且MFI和MEL相共生加速了催化剂失活.

关键词：构效关系分子筛催化甲醇制烯烃铝分布酸性共生MFI/MEL Pentasil分子筛

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

New Taxa of Chrysomelidae (Insecta:Coleoptera) from Rovno Amber,Late Eocene

引用

Acta Geologica Sinica(English Edition) 2010年第4期84卷 772-782页

作者： Konstantin NADEIN evgeny PERKOVSKY Schmalhausen Institute of Zoology National Academy of Sciences of UkraineKievUkraine

Leaf beetles Chrysomelidae of Rovno amber, from the Late Eocene, are recorded and described. Chrysomelidae of Rovno amber are represented by three subfamilies： Galerucinae （Alticini）, Chrysomelinae, and Enmolpinae. Two new genera and three new species of Alticini： Manobiomorpha Nadein, gen. nov. （type species Manobiomorpha eocenica Nadein, sp. nov.）, Psyllototus Nadein, gen. nov. （type species PsyUototus progenitor Nadein, sp. nov.）, and Crepidodera decolorata Nadein et Perkovsky, sp. nov. are described. A new chrysomeline genus and species Paleophaedon minutus Nadein gen. nov. et sp. nov. is described. Probable trophic association of Crepidodera decolorata sp. nov., the taxonomic positions of Manobiomorpha gen. nov. and PsyUototus gen. nov., and the composition of leaf beetle faunas of Middle and Late Eocene of Europe are discussed.

关键词： Chrysomelidae Rovno amber Late Eocene new genera new species

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

Molecular testing for colorectal cancer:Clinical applications

引用

World Journal of Gastrointestinal Oncology 2021年第10期13卷 1288-1301页

作者： evgeny Imyanitov Ekaterina Kuligina Department of Tumor Biology N.N.Petrov Institute of OncologySt.-Petersburg 197758Russia Department of Medical Genetics St.-Petersburg Pediatric Medical UniversitySaint-Petersburg 194100Russia Department of Oncology I.I.Mechnikov North-Western Medical UniversitySaint-Petersburg 191015Russia

Molecular genetic analysis is an integral part of colorectal cancer(CRC)*** choice of systemic therapy for CRC is largely based on the results of tumor molecular *** of the KRAS and NRAS gene status is mandatory for consideration of anti-epidermal growth factor receptor(EGFR)*** with the BRAF V600E substitution are characterized by aggressive behaviour,may require intensified cytotoxic regimens and benefit from combined BRAF and EGFR *** inactivation of DNA mismatch repair(MMR),or MUTYH gene,or DNA polymerase epsilon results in excessive tumor mutational burden;these CRCs are highly antigenic and therefore sensitive to immune checkpoint *** CRCs are characterized by overexpression of the HER2 oncogene and respond to the appropriate targeted *** are CRCs with clinical signs of hereditary predisposition to this disease,which require germline genetic *** biopsy is an emerging technology that has the potential to assist CRC screening,control the efficacy of surgical intervention and guide disease *** landscape of CRC molecular diagnosis is currently undergoing profound changes due to the increasing use of next generation sequencing.

关键词： Colorectal cancer Anti-epidermal growth factor receptor therapy KRAS NRAS BRAF HER2 Microsatellite instability MUTYH Hereditary cancer

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

Research on magnetic fields of galaxies using RZ-model

引用

Research in Astronomy and Astrophysics 2021年第3期21卷 57-60页

作者： evgeny Alexandrovich Mikhailov Vasilii Vladimirovich Pushkarev Faculty of Physics M.V.Lomonosov Moscow State UniversityMoscow 119991Russia University of Cambridge Trinity LaneCambridgeCB21TNUnited Kingdom

The generation of magnetic fields of galaxies is usually described by the dynamo *** process is characterized by the Steenbeck-Krause-Radler equation,which is the result of averaging the magnetohydrodynamics equations by distances which are associated with the size of turbulent cells in the interstellar *** equation is quite difficult to solve both from an analytical and numerical point of *** galaxies,the no-z approximation is widely *** describes the magnetic fields in thin *** such objects,where it is important to study the vertical structure of the field,it is not very applicable,so it is quite useful to adopt the RZ-model,which takes into account the dependence of the distance from the equatorial *** our research we have obtained the critical values of the dynamo number for galaxies with large *** have also described typical z-structure for the magnetic ***,we have demonstrated that it is possible to generate dipolar magnetic fields.

关键词： general:dynamo,magnetic fields methods:numerical galaxies:magnetic fields

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 Evaluation of Modern Bituminous Binders in Group Hydrocarbon Composition and Their Application in Construction

引用

Materials Sciences and Applications 2023年第8期14卷 407-415页

作者： Vasily Koshkarov Ilya Shunyaev evgeny Koshkarov Production Company KT (KT TRON) Yekaterinburg Russia Scientific Research Center Asphaltit (SRC Asphaltit) Yekaterinburg Russia

The article is the result of theoretical and experimental studies aimed at determining the structural groups of modern bituminous materials in order to assess the raw materials, production technology, rational directions for their use in construction, the road industry and waterproofing. Commercial oil bitumen, raw tars and heavy oil residues (semi-finished products) of oil refineries aimed at meeting large-tonnage needs have been studied. The assessment was carried out according to the group hydrocarbon composition, by liquid chromatography using model compounds. Comparative analysis showed a general trend for all studied samples of petroleum bitumen: low content of asphaltenes (from 3.9 to 23.9 wt.%), low content of resins (from 11 to 19.07 wt%), insufficient for the formation of stable structuring layers, and a significant content of aromatic hydrocarbons, including heavy aromatic compounds (more than 20 wt.%). An assumption was made about the influence of the origin and the structure obtained during the processing of asphaltenes and resins on the transition from one type of bituminous structure to another based on the lyophility of high-molecular group components. A comparative structural characteristic of heavy oil residues from gasoline and oil production is considered in comparison with bitumens of various viscosities. Recommendations are given on the technology of processing petroleum feedstock and the use of heavy oils in order to obtain a given bitumen structure for the production of rational bitumen products for construction and waterproofing.

关键词： Bitumen Tar Construction Waterproofing Oil Refining Group Hydrocarbon Composition Viscosity Asphaltenes

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

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：