检索结果-南通市图书馆

Rice science 2015年第1期22卷 16-26页

作者： Khandakar md IFTEKHARUDDAULA helal uddin AHMED Sharmistha GHOSAL Zakiah Rahman MONI Al AMIN md Shamsher ALI Plant Breeding Division Bangladesh Rice Research Institute

Submergence tolerant high yielding rice variety was developed using BR11 as a recipient parent applying foreground, phenotypic and background selection approaches. Recombinant selection was found essential to minimize linkage drag by BC2F2 generation. Without recombinant selection, the introgression size in the backcross recombinant lines （BRLs） was approximately 15 Mb on the carrier chromosome. The BRLs were found submergence tolerance compared to the check varieties under complete submergence for two weeks at Bangladesh Rice Research Institute, and produced higher yield compared to the isogenic Subl-line under controlled submerged condition. The BRL IR85260-66-654-Gaz2 was released as BRRI dhan52 in 2010, which was the first high yielding submergence tolerant variety in Bangladesh. BRRI dhan52 produced grain yield ranging from 4.2 to 5.2 t/hm2 under different flash flood prone areas of Bangladesh in three consecutive seasons. The study demonstrated the efficiency of recombinant selection and better adaptability of the newly released submergence tolerant high yielding variety in flash flood prone different areas of the country with respect to submergence tolerance and yield potential.

关键词： backcross recombinant line marker-assisted backcrossing recombinant selection rice submergence tolerance

HBsAg, HBcAg, and combined HBsAg/HBcAg-based therapeutic vaccines in treating chronic hepatitis B virus infection

在线全文

学校读者我要写书评

暂无评论

Hepatobiliary & Pancreatic Diseases International 2013年第4期12卷 363-369页

作者： Sheikh Mohammad Fazle Akbar Mamun Al-Mahtab Mohammad helal uddin md. Sakirul Islam Khan Department of Medical Sciences Toshiba General HospitalTokyo Japan Department of Hepatology Bangabandhu Sheikh Mujib Medical UniversityDhaka Bangladesh Clinical Research Organization Dhaka Bangladesh Laboratory of Animal Production Faculty of Agriculture Ehime UniversityMatsuyama Japan

BACKGROUND: As the host immunity is diminished in patients with chronic hepatitis B (CHB), different approaches have been used to up-regulate their immune responses to produce therapeutic effects. But, cytokines, growth factors and polyclonal immune modulators could not exhibit sufficient therapeutic effects in these patients. Immune therapy with HBV-related antigens (vaccine therapy) has been used in CHB patients. But there is a paucity of information about the design of HBV antigen-based immune therapy in these patients. DATA SOURCE: Preclinical and clinical studies on immune therapy with HBsAg-based vaccine, HBcAg and combination of HBsAg/HBcAg-based vaccines have been discussed. RESULTS: HBsAg-based prophylactic vaccine was used as an immune therapeutic agent in CHB patients; however, monotherapy with HBsAg-based immune therapy could not lead to sustained control of HBV replication and/or liver damages. HBsAg-based vaccine was used as a combination therapy with cytokines, growth factors, and antiviral drugs. HBsAg-based vaccine was also used for cell-based therapy. However, satisfactory therapeutic effects of HBsAg-based vaccine could not be documented in CHB patients. In the mean time, evidences have supported that HBcAg-specific immunity is endowed with antiviral and liver protecting capacities in CHB patients. Recent data concentrate on the clinical use of combined HBsAg- and HBcAg-based vaccines in CHB ***: Antigen-based immune therapy with HBV- related antigens may be an alternative method for the treatment of CHB patients but proper designs of antigens, types of adjuvants, dose of vaccinations, and routes of administration need further analyses for the development of an effective regimen of immune therapy against HBV.

关键词： chronic hepatitis B HBsAg vaccine HBsAg/HBcAg vaccine immune therapy therapeutic vaccines

Mechanical and thermodynamical stability of BiVO4 polymorphs using first-principles study

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2017年第3期26卷 395-403页

作者： A K M Farid UI Islam md Nurul Huda Liton H M Tariqul Islam md Al helal md Kamruzzaman Department of Computer Science and Engineering Begum Rokeya University Rangpur Rangpur-5400 Bangladesh Department of Physics Begum Rokeya University Rangpur Rangpur-5400 Bangladesh Department of Chemistry Begum Rokeya University Rangpur Rangpur-5400 Bangladesh Department of Physics and Materials Science and Center of Super-Diamond and Advanced Films (COSDAF) City University of Hong Kong Hong Kong SAR China

First principles calculations of structural, electronic, mechanical, and thermodynamic properties of different poly- morphs of BiVO4 are performed using Bender-type plane/wave ultrasoft pseudopotentials within the generalized gradient approximation （GGA） in the flame of density functional theory （DFT）. The calculated structural and electronic properties are consistent with the previous theoretical and experimental results. The electronic structures reveal that m-BiVO4, op- BiVO4, and st-BiVO4 have indirect band gaps, on the other hand, zt-BiVO4 has a direct band gap. From the DOS and Mulliken＇s charge analysis, it is observed that only m-BiVO4 has 6s2 Bi lone pair. Bond population analysis indicates that st-BiVO4 shows a more ionic nature and a similar result is obtained from the elastic properties. From the elastic prop- erties, it is observed that st-BiVO4 is more mechanically stable than the others, st-BiVO4 is more ductile and useful for high electro-optical and electro-mechanical coupling devices. Our calculated thermodynamic properties confirm the similar characteristics found from electronic and elastic properties, m-BiVO4 is useful as photocatalysts, solid state electrolyte, and electrode and other polymorphs are applicable in electronic device fabrications.

关键词： BiVO4 crystal structure lone pair mechanical stability

Time-Dependent Flow with Convective Heat Transfer through a Curved Square Duct with Large Pressure Gradient

在线全文

学校读者我要写书评

暂无评论

Open Journal of Fluid Dynamics 2015年第3期5卷 238-255页

作者： Rabindra Nath Mondal md. Nurul Amin helal Poly Rani Shaha Nayan Kumar Poddar Department of Mathematics Jagannath University Dhaka Bangladesh Additional Director (Education) Training Directorate BGB Head Quarter Pilkhana Dhaka Bangladesh

A numerical study is presented for the fully developed two-dimensional laminar flow of viscous incompressible fluid through a curved square duct for the constant curvature δ = 0.1. In this paper, a spectral-based computational algorithm is employed as the principal tool for the simulations, while a Chebyshev polynomial and collocation method as secondary tools. Numerical calculations are carried out over a wide range of the pressure gradient parameter, the Dean number, 100 ≤ Dn ≤ 3000 for the Grashof number, Gr, ranging from 100 to 2000. The outer wall of the duct is treated heated while the inner wall cooled, the top and bottom walls being adiabatic. The main concern of the present study is to find out the unsteady flow behavior i.e. whether the unsteady flow is steady-state, periodic, multi-periodic or chaotic, if Dn or Gr is increased. It is found that the unsteady flow is periodic for Dn = 1000 at Gr = 100 and 500 and at Dn = 2000, Gr = 2000 but steady-state otherwise. It is also found that for large values of Dn, for example Dn = 3000, the unsteady flow undergoes in the scenario “periodic→chaotic→periodic”, if Gr is increased. Typical contours of secondary flow patterns and temperature profiles are also obtained, and it is found that the unsteady flow consists of single-, two-, three- and four-vortex solutions. The present study also shows that there is a strong interaction between the heating-induced buoyancy force and the centrifugal force in a curved square passage that stimulates fluid mixing and consequently enhance heat transfer in the fluid.

关键词： Curved Square Duct Secondary Flow Time-Evolution Periodic Solution Chaos

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

基于激光跟踪仪的机身桶段测量技术研究

装备制造技术 2017年第12期 107-111页

作者：王巍李昂 md helal MIAH 沈阳航空航天大学航空航天工程学部辽宁沈阳110000

目前传统测量技术已难以满足飞机制造中不断提高的检测要求,数字化测量技术已成为提高飞机产品检测效率与质量的重要手段。针对这一发展趋势,通过基于激光跟踪仪的机身桶段测量技术研究,系统地总结了飞机产品测量中激光跟踪仪测量场的... 详细信息

目前传统测量技术已难以满足飞机制造中不断提高的检测要求,数字化测量技术已成为提高飞机产品检测效率与质量的重要手段。针对这一发展趋势,通过基于激光跟踪仪的机身桶段测量技术研究,系统地总结了飞机产品测量中激光跟踪仪测量场的组成、建立飞机测量坐标系的方法以及激光跟踪仪转站的原理。结合某型飞机前机身桶段的测量过程,重点介绍了利用激光跟踪仪对机身桶段关键特性和关键对接点进行在线测量及数据分析的方法,分析验证了激光跟踪仪系统在飞机产品测量中的应用情况。

关键词：数字化测量激光跟踪仪测量场飞机测量坐标系机身桶段

在线全文

学校读者我要写书评

暂无评论

基于产品数模的汽车焊接夹具调装技术研究

计算机测量与控制 2018年第6期26卷 168-171页

作者：王巍金文瀚海拉尔张瑞沈阳航空航天大学航空航天工程学部沈阳110136 沈阳航空航天大学国际教育学院沈阳110136 沈阳航空航天大学创新创业学院沈阳110136

在汽车零件的生产过程中,焊接夹具的安装准确度将会直接影响汽车零件焊接质量;传统方法是以工装数模作为参考对象进行调装,但往往由于夹具设计错误导致夹具安装不准确;为此,提出一种以产品数模作为参考对象,通过关节臂测量机和PC-DMIS... 详细信息

在汽车零件的生产过程中,焊接夹具的安装准确度将会直接影响汽车零件焊接质量;传统方法是以工装数模作为参考对象进行调装,但往往由于夹具设计错误导致夹具安装不准确;为此,提出一种以产品数模作为参考对象,通过关节臂测量机和PC-DMIS软件的结合使用进行调装的方法;该方法可以有效的检查夹具设计是否正确以及安装准确度是否符合要求,对于提高汽车零件的焊接质量和生产效率具有重要的应用价值;最后结合某型汽车车门焊接夹具的调装过程,以验证方法的可行性。

关键词：关节臂测量机夹具调装产品数模