检索结果-南通市图书馆

Development of a Novel Parallel-spool Pilot Operated High-pressure Solenoid Valve with High Flow Rate and High Speed

引用

Chinese Journal of Mechanical Engineering 2015年第2期28卷 369-378页

作者： DONG dai LI Xiaoning School of Mechanical Engineering Nanjing University of Science and Technology

High-pressure solenoid valve with high flow rate and high speed is a key component in an underwater driving ***,traditional single spool pilot operated valve cannot meet the demands of both high flow rate and high speed simultaneously.A new structure for a high pressure solenoid valve is needed to meet the demand of the underwater driving system.A novel parallel-spool pilot operated high-pressure solenoid valve is proposed to overcome the drawback of the current single spool *** models of the opening process and flow rate of the valve are *** response time of the valve is subdivided into 4 parts to analyze the properties of the opening *** formulas to solve 4 parts of the response time are *** factors that influence the opening response time are *** to the mathematical model of the valve,a simulation of the opening process is carried out by *** are chosen based on theoretical analysis to design the test prototype of the new type of *** response time of the designed valve is tested by verifying response of the current in the coil and displacement of the main valve *** experimental results are in agreement with the simulated results,therefore the validity of the theoretical analysis is *** opening response time of the valve is 48.3 ms at working pressure of 10 *** flow capacity test shows that the largest effective area is 126 mm2 and the largest air flow rate is 2320 L/*** to the result of the load driving test,the valve can meet the demands of the driving *** proposed valve with parallel spools provides a new method for the design of a high-pressure valve with fast response and large flow rate.

关键词： high-pressure pneumatic solenoid valve parallel-spool high flow rate high speed opening response time

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

Thermophoresis effects on gas-particle phases flow behaviors in entrained flow coal gasifier using Eulerian model

引用

Chinese Journal of Chemical Engineering 2017年第6期25卷 712-721页

作者： Chao dai Fan Gu School of Energy and Environment Southeast University Nanjing 210096 China

A numerical model based on the Eulerian–Eulerian two-fluid approach is used to simulate the gasification of coal char inside an entrained flow gasifier. In this model, effects of thermophoresis of coal char particles are thoroughly investigated. The thermophoresis is due to the gas temperature gradient caused by absorpted heat of coal char gasification. This work, firstly, calculates the gas temperature gradient and thermophoretic force at1100 °C,1200 °C,1300 °C and 1400 °C wall temperatures. Then, the changes of particle volume fraction and velocity in the gasifier are studied in the simulation with thermophoresis or not. The results indicate that considering the particle thermophoresis has some effects on the calculation of particle volume fraction in the gasifier, especially at wall temperature of 1400 °C, and the maximum particle volume fraction variance ratio reaches up to 1.38% on wall surface of the gasifier. These effects are mainly caused by large gas temperature gradient along the radial direction of the gasifier. For the particle velocity, the changes are small but can be observable along radial direction of the gasifier, which has good agreement with the distributions of radial gas temperature gradient and thermophoretic force. These changes above may have certain effects on gasification reaction rates in this Eulerian model. So the change of gasification reaction rates in the simulation with thermophoresis or not is studied finally.

关键词： Gasification Thermophoresis Eulerian model Two-phase flow

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

Differential transform method for solving Richards' equation

引用

Applied Mathematics and Mechanics(English Edition) 2016年第2期37卷 169-180页

作者： Xi CHEN Ying dai School of Aerospace Engineering and Applied Mechanics Tongji University

An approximate solution to Richards＇ equation is presented, mathematically describing a sort of unsaturated single phase fluid flow in porous media. The approach is a differential transform method （DTM） with interm... 详细信息

关键词： approximate analytical solution Richavds' equation differential transform method (DTM) intermediate variable

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

An AP-DE Algorithm Based on Multi-step Gradient Method

引用

Chinese Journal of Electronics 2016年第1期25卷 146-151页

作者： dai Dameng MU Dejun College of Physics and Electronic Information Engineering Wenzhou University Department of Automatic Control Northwestern Polytechincal University

Aim to improve the convergence of the adaptive filtering, based on the multi-step gradient method, a new affine pro jection algorithm with direction error is presented. The statistical behavior of the proposed algorithm is analyzed. The deterministic recursive equations for the weight error and for the Mean-square error(MSE) are derived in the weight update direction of the adaptive filtering. The steady-state MSE is also *** results show that the proposed algorithm improve the adaptive filtering convergence and corroborate the theoretical analytical results.

关键词： Affine projection Statistical behavior Adaptive filtering System identification

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

The Improved Interpolating Complex Variable Element-Free Galerkin Met hod for Two- D imensional Elastic Problems

引用

Acta Mechanica Solida Sinica 2022年第2期35卷 328-343页

作者： Yajie Deng Ying dai School of Aerospace Engineering and Applied Mechanics Tongji UniversityShanghai 200092China

An improved interpolating complex variable element-frees Galerkin(IICVEFG)method for the two-dimensional elastic problems is *** method is based on the improved interpolating complex variable moving least-squares(IICVMLS)method and the integral form of the elastic *** the IICVEFG method,the proposed shape function has the interpolating ***,the essential boundary conditions can be exerted ***,the unnecessary t erms in the discrete mat rices are removed,which resul ts in a set of concise *** method is verified by analyzing three elastic examples under different constraints and *** numerical results show that the IICVEFG method is superior in precision and efficiency to other non-interpolating meshless methods.

关键词： Interpolating meshless met hod Elastic problems Singular weight function Complete basis function

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

Environmental catalysis: a solution for the removal of atmospheric pollutants

引用

Science Bulletin 2015年第19期60卷 1708-1710页

作者： Hongxing dai Beijing Key Laboratory for Green Catalysis and Separation Key Laboratory of Beijing on Regional Air Pollution Control Key Laboratory of Advanced Functional Materials Ministry of Education and Laboratory of Catalysis Chemistry and Nanoscience Department of Chemistry and Chemical Engineering College of Environmental and Energy EngineeringBeijing University of Technology

Atmospheric pollutants such as nitrogen oxides(NO x),carbon monoxide,and volatile organic compounds(VOCs),chiefly emanating from industrial activities and transportation vehicles,are harmful to human *** is one of the most effective and economic technologies to control serious air pollution problems;however,the key issue is the availability of high-performance *** efforts have been made to develop

关键词：大气污染物环境催化挥发性有机物交通运输工具高性能催化剂氮氧化物一氧化碳工业活动

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

Investigating loss of heterozygosity in a SCRaMbLEd yeast genome

引用

Science China(Life Sciences) 2019年第6期62卷 868-869页

作者： Junbiao dai Shenzhen Key Laboratory of Synthetic Genomics and Center for Synthetic Genomics Institute of Synthetic Biology Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences

Loss of heterozygosity (LOH) is a phenomenon in which elimination of one parental genomic region occurs in interspecific hybrids. LOH is common in cancer (Deng et al., 1996;Koufos et al., 1985). However, genetic analy... 详细信息

关键词： Loss of heterozygosity elimination individual genomes

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

Focusing Ability Enhancement in Broadside Direction of Array:From UCA to UCCA

引用

Tsinghua Science and Technology 2024年第5期29卷 1593-1603页

作者： Zidong Wu Linglong dai Department of Electronic Engineering Tsinghua Universityand also with Beijing National Research Center for Information Science and Technology(BNRist)Beijing 100084China

To meet the ever-increasing demand for the data rates of wireless communications,extremely large-scale antenna array(ELAA)has emerged as one of the candidate technologies for future 6G *** significantly increased number of antennas in ELAA gives rise to near-field communications,necessitating tailored beamforming techniques within the near-field regions to accommodate the spherical-wave propagation *** various array geometries of ELAA,uniform circular array(UCA)has gained much attention for its distinct capability of maintaining uniform beam pattern across different azimuth ***,existing analysis of near-field UCA beamforming indicates that the near-field region severely declines in the broadside of UCA,where the system fails to benefit from near-field *** tackle this problem,the near-field beamforming technique of uniform concentric circular arrays(UCCAs)is investigated in this paper,which has the potential to enlarge the near-field region in the broadside ***,the analysis of beamforming gain in the 3D space with UCA and UCCA is ***,the distinct beamforming characteristics that set UCCA apart from UCA are delineated,revealing the superiority of UCCA in extending the near-field region in broadside at the cost of slightly reduced near-field region in the *** results are provided to verify the effectiveness of the theoretical analysis of beamforming gain with UCCA and the enhanced focusing ability of UCCA in the broadside direction.

关键词： extremely large-scale antenna array(ELAA) uniform concentric circular array(UCCA) near-field communications

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

An unexpected X-ray transient favors very stiff neutron-star matter

引用

Science Bulletin 2019年第20期64卷 1474-1475页

作者： Zigao dai School of Astronomy and Space Science Nanjing University

Short-duration gamma-ray bursts (SGRBs) are mysterious gamma-ray flashes with durations less than two seconds, which occur at the cosmological distances. Some of them usually not only have very tenuous medium gases and old host galaxies but also are in the outskirts of the galaxies, suggesting an origin of binary neutron star (NS) mergers (1)This origin was confirmed undoubtedly thanks to the discoveries of a gravitational wave event namedGW170817 and its electromagnetic counterparts (an SGRB, a multiwavelengthkilo-nova, and a broadband afterglow) [2].

关键词： China An unexpected X-ray transient favors very stiff neutron-star matter origin

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

Resonance Profiles of Mg 3pns Autoionizing States

引用

Chinese Physics Letters 1995年第3期12卷 152-155页

作者： dai Changjian Department of Physics Zhejiang UniversityHangzhou 310027

Multichannel quantum-defect theory is combined with the R-matrix calculations to study the resonance lineshape of autoionizing 3pns state of atomic *** R-matrices calculated with different reaction volumes hardly affect the total cross section of photoionization of the Mg 3sns Rydberg *** comparison between theoretical and experimental results fs furnished.

关键词： state. magnesium matrices

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：