检索结果-南通市图书馆

Characteristic research of regeneration process of particulate filter medium in vibrated fluidized bed

Clean Energy 2023年第6期7卷 1189-1198页

作者： bing liu Lixin He Xianglong Zhao Yi Guo Clean Coal Technology Center National Institute of Clean-and-Low-Carbon EnergyChina Energy GroupFuture Science CityChangping DistrictBeijing 102211P.R.China

The vibrational fluidized bed is innovatively adopted to regenerate the particulate filter medium for the purification of crude syn-thesis gas from the coal gasification *** research of vibrated fluidized beds during dust-containing particulate filter medium regeneration has been carried *** ideal transport model of particulate filter medium on the distributor is estab-lished and verified by using *** mean residence time of the particulate filter medium can be reduced by 72%from 5.5 to 1.5 min with an increase in the working frequency from 50 to 60 *** thickness of the bed layer is linearly increased with the feeding rate of the particulate filter medium under ideal working *** resistance models of the fluidizing air are built up and validated,and they can be used to calculate the pressure drop of the static bed layer of the particulate filter medium on the flu-idizing air distributor,which is the maximum value of the dynamic bed layer with the same *** fluidizing air makes the mean residence time of the particulate filter medium decrease by 50%and reduces the difference in the particulate mean residence time under different feeding-rate *** regeneration effect of dust-containing filter medium particles in a vibrated fluidized bed is *** air with superficial velocity ranging from 0 to 0.6~0.9 m·s-1 makes the regeneration efficiency increase from 29.41%to 70.59~88.24%.This article provides a reference for the industrial application of a vibrated fluidized bed for the par-ticulate filter medium recycling system.

关键词： vibrated fluidized bed filter medium residence time pressure drop separation efficiency coal gasification

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

Receptivity of plane Poiseuille flow to local micro-vibration disturbance on wall

引用

Water Science and Engineering 2015年第2期8卷 145-150页

作者： Wei-dong Cao Qi-xiang Hu bing liu Research Center of Fluid Machinery Engineering and Technology Jiangsu University

The receptivity of plane Poiseuille flow to local single-period micro-vibration disturbances with different phases at the top and bottom walls was investigated through direct numerical simulation of three-dimensional incompressible Navier-Stokes equations. Results show that the disturbance presents a symmetrical distribution in the spanwise direction when the micro-vibration on the wall ends, and the initial disturbance velocities and spatial distribution of the disturbance structure are different at the top and bottom walls. The disturbance＇s velocity, amplitude, and high- and low-speed streaks increase with time, and the amplitude of streamwise disturbance velocity is larger than those of spanwise and vertical disturbance velocities. However, no significant Tollmien-Schlichting wave was found in the flow field. The number of disturbance vortex cores gradually increases with the disturbance area. High-speed disturbance fluid concentrates near the wall and its normal velocity largely points to the wall, while low-speed disturbance fluid largely deviates from the wall. Furthermore, the streamwise velocity profiles near the top and bottom walls both become plump because of the existence of the disturbances, and the streamwise velocity profiles show a trend of evolving into turbulent velocity profiles. The shear stress near the wall increases significantly. The local micro-vibration disturbance on the wall in plane Poiseuille flow can induce the development of a structure similar to turbulent spots.

关键词： Poiseuille flow Disturbance Velocity profile Vortex High-and low-speed streaks

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

Antidiabetic effects of chitooligosaccharides on pancreatic islet cells in streptozotocin-induced diabetic rats

引用

World Journal of Gastroenterology 2007年第5期13卷 725-731页

作者： bing liu Wan-Shun liu Bao-Qin Han Yu-Ying Sun Department of Marine Life Science Ocean University of ChinaYushan Road No. 5 Qingdao Shandong Province China

AIM: To investigate the effect of chitooligosaccharides on proliferation of pancreatic islet cells, release of insulin and 2 h plasma glucose in streptozotocin-induced diabetic ***: In vitro, the effect of chitooligosaccharides on proliferation of pancreatic islet cells and release of insulin was detected with optical microscopy, colorimetric assay, and radioimmunoassay respectively. In vivo, the general clinical symptoms, 2 h plasma glucose, urine glucose, oral glucose tolerance were examined after sixty days of feeding study to determine the effect of chitooligosaccharides in streptozotocin-induced diabetic rats. RESULTS: Chitooligosaccharides could effectively accelerate the proliferation of pancreatic islet cells. Chitooligosaccharides (100 mg/L) had direct and prominent effect on pancreastic β cells and insulin release from islet cells. All concentrations of chitooligosaccharides could improve the general clinical symptoms of diabetic rats, decrease the 2 h plasma glucose and urine glucose, and normalize the disorders of glucose ***: Chitooligosaccharides possess various biological activities and can be used in the treatment of diabetes mellitus.

关键词： Chitooligosaccharides Diabetes mellitus Two hours plasma glucose Oral glucose Tolerance test Pancreastic islet cells Streptozotocin

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

Raman and Surface-enhanced Raman Scattering of Chlorophenols

引用

Chemical Research in Chinese Universities 2011年第5期27卷 854-856页

作者： SONG Wei SHANG Xiao-hong LU Yong liu bing-bing WANG Xu State Key Laboratory of Supramolecular Structure and Materials State Key Laboratory of Superhard Materials Jilin University Changchun 130012 P. R. China

Raman spectrum is a powerful analytical tool for determining the chemical information of compounds. In this study, we obtained analytical results of chlorophenols（CPs） molecules including 4-chlorophenol（4-CP）, 2,6-dich- lorophenol（2,6-DCP） and 2,4,6-trichlorophenol（2,4,6-TCP） on the surface of Ag dendrites by surface-enhanced Raman scattering（SERS） spectra. SEM images indicate that the SERS substrate of Ag dendrites is composed of a large number of polygonal nanocrystallites, which self-assembled into a 3D hierarchical structure. It was found that there were distinct differences for those three molecules from Raman and SERS spectra. This indicates that SERS could be a new tool of detection technique regarding trace amounts of CPs.

关键词： Surface-enhanced Raman scattering(SERS) Ag dendrite Chloropheno[

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

CFD–DEM–CVD multi-physical field coupling model for simulating particle coating process in spout bed

引用

Particuology 2019年第1期17卷 67-78页

作者： Malin liu Meng Chen Tianjin Li Yaping Tang Rongzheng liu Youlin Shao bing liu Jiaxing Chang Institute of Nuclear and New Energy Technology Collaborative Innovation Center of Advanced Nuclear Energy TechnologyTsinghua UniversityBeijing 100084China

Particle coating is a very important step in many industrial production processes as the particle coating layers may fix surfaces with unique advantages. Given the limitation and disadvantages of the existing simulation methods, a coupled CFD–DEM–CVD multi-physical field model for particle-coating simulations has been established taking into account the velocity field, temperature field, concentration field, and deposition model. In this model, gas behavior and chemical reactions are simulated in the CFD frame based on the conservation laws of mass, momentum, and energy. The particle behavior is simulated in the DEM frame based on the gas–solid interphase force model and contact force model. The deposition behavior is simulated in the CVD frame based on the particle movement–adhesion–deposition model. The coupled model can be implemented in Fluent-EDEM software with their user definition function and application programming interface. The particle coating process involving the pyrolysis of acetylene was investigated, and the effect of bed temperature and inlet gas velocity on deposition rate and coating efficiency were investigated based on the proposed model with adjustable deposition coefficients. Both the average deposition layer mass and the average deposition layer thickness were found to be proportional to the elapsed time and increased at the rate of about 1.05 × 10^-2 mg/s and 3.45 × 10^-4 mm/s, respectively, setting the inlet gas velocity to 11 m/s and bed temperature to 1680 K. A higher temperature and larger inlet gas velocity lead to a larger deposition rate, but the coating efficiency decreases because of limits imposed by the chemical reaction. At a bed temperature of 1280 K, the average deposition rate is 7.40 × 10?3 mg/s when the inlet gas velocity is set to 11 m/s, which is about double the deposition rate when the inlet gas velocity is set as 5 m/s. The proposed model can provide some guidance for the operating conditions and parameters design of t

关键词： Particle coating process CFD–DEM–CVD Multi-physical field Chemical vapor deposition model Multiscale 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

New method of improving parts accuracy by adding heat balance support in selective laser sintering

引用

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第3期10卷 361-369页

作者： bing liu Li-chao ZHANG Jian-hua MO Bo QIAN State Key Laboratory of Plastic Forming Simulation and Die and Mould Technology School of Material Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China

In order to improve parts accuracy, a method of adding heat balance support （HBS） was proposed, and the detailed algorithm for generating HBS was developed. A number of experiments and a comparison between similar softwares, showed that the algorithm is efficient and feasible. Moreover, different features of riBS were studied for different kinds of materials, such as PS and nylon. The research findings indicate that automatically adding HBS can significantly improve the accuracy of the parts, and that the algorithm for generating HBS is efficient and precise.

关键词： Selective laser sintering (SLS) Accuracy Heat balance support (HBS) Triangular facet 3D rings

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

Calculation of electric field effects on the Gibbs free energy of the Al-Li-Mg alloy

引用

Rare Metals 2007年第5期26卷 508-514页

作者： ZHANG Jianjun CHEN Zheng WANG Yongxin liu bing LI Yongsheng School of Materials Science and Engineering Northwestern Polytechnical University Xi＇an 710072 China

Based on the Thomas-Fermi model,the calculation methods of the monatomic Gibbs free energy were found. The interior potential boundary condition under electric field was defined. The calculation methods of Gibbs free energy for the monatomic,compound,and solid solution with electric field were set up. Under the influence of electric field,the Gibbs free energy of Al is the most sensitive,followed by those of Li and Mg. At the solution temperature the Gibbs free energies of Al3Li and its elements under electric field are not symmetrical about the zero point of electric field,whereas at the aging temperature their values are symmetrical about the zero point of electric field. At the solution temperature near the zero point of electric field,the Gibbs free energy of Al3Li is higher than that of Al-2.14%Li. And at 460 K the Gibbs free energy of Al3Li is lower than that of Al-2.14wt.%Li under electric field. The Gibbs free energy of 1420 alloy decreases from both sides of electric field to the zero point at the aging temperature.

关键词： Al-Li-Mg alloy thermodynamics parameters Thomas-Fermi model electric field

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

Growth of BeO Nanograins Synthesized by Polyacrylamide Gel Route

引用

Journal of Materials Science & Technology 2011年第2期27卷 147-152页

作者： Xiaofeng Wang Richu Wang Chaoqun Peng Tingting Li bing liu School of Materials Science and Engineering Central South UniversityChangsha 410083China

BeO nanoparticles were synthesized by polyacrylamide gel *** effects of the processing parameters on the morphology and size of the synthesized BeO nanoparticles were *** calcination temperature of the gel precursor containing beryllium sulfate was determined by thermogravimetry and differential scanning calorimetry（TG-DSC）,which is around 690 C and 160 C lower than the general *** diffractometry（XRD）,transmission electron microscopy（TEM）,and specific surface area measurements（BET） showed that the synthesized nanoparticles under 700 C were pure,globular and about ～5-20 nm with narrow ***,the nanograins coalesced and grew under higher calcination temperatures and longer calcination *** influence of calcination temperature on the morphology and growth behavior is greater than that of its *** activation energy for grain growth was estimated to be 24.53 kJ/mol,and the dominant growth mechanism was most likely to be related to the vapor transport in pore control mode and grain-rotation-induced grain coalescence（GRIGC） mechanism.

关键词： Nanograins BeO Grain growth Polycrylamide gel

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

MIMO Underwater Acoustic Communication in Shallow Water with Ice Cover

引用

China Ocean Engineering 2019年第2期33卷 237-244页

作者： HAN Xiao YIN Jing-wei liu bing GUO Long-xiang Acoustic Science and Technology Laboratory Harbin Engineering University Key Laboratory of Marine Information Acquisition and Security (Harbin Engineering University) Ministry of Industry and Information Technology College of Underwater Acoustic Engineering Harbin Engineering University

Although multiple-input multiple-output(MIMO) underwater acoustic(UWA) communication has been intensively investigated in the past years, existing works mainly focus on open-water environment. There is no work reporting MIMO acoustic communication in under-ice environment. This paper presents results from a recent MIMO acoustic communication experiment which was conducted in Bohai Gulf during winter. In this experiment, high frequency MIMO signals centered at 10 kHz were transmitted from a two-element source array to a four-element vertical receiving array at 1 km range. According to the received signal of different array elements, MIMO acoustic communication in under-ice environment suffers less effect from co-channel interference compared with that in open-water environment. In this paper, time reversal followed by a single channel decision feedback equalizer is used to process the experimental data. It is demonstrated that this simple receiver is capable of realizing robust performance using fewer hydrophones(i.e. 2) without the explicit use of complex co-channel interference cancelation algorithms, such as parallel interference cancelation or serial interference cancelation.

关键词： underwater acoustic communication MIMO shallow water ice cover

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

Analysis and control of a non-smooth population model with impulsive effects

引用

International Journal of Biomathematics 2018年第5期11卷 267-283页

作者： Jing Na liu Tie Zhang Lichun Zhao bing liu Department of Mathematics Northeastern University Shenyang 110006 P. R. China School of Mathematics and Information Science Anshan Normal University AnShan 114007 P. R. China

In this paper, a non-smooth population model with impulsive effects is proposed by combining discontinuity and non-smoothness. According to the qualitative theory of differential equations, the global analysis of the model is discussed. Using the theory of impulsive differential equations, the existence conditions of order one periodic solution are obtained. And the impulsive controllers are designed to make the pest populations stay at the refuge level. Some simulations are carried out to prove the results.

关键词： Impulsive differential equation global analysis order one periodic solution impulsive controller non-smooth population model.

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：