检索结果-南通市图书馆

Optimum configuration of groynes for stabilization of alluvial rivers with fine sediments

International Journal of Sediment Research 2012年第2期27卷 158-167页

作者： mohammed alauddin Tetsuro TSUJIMOTO Department of Civil Engineering Dhaka University of Engineering & Technology(DUET)Gazipur-1700Bangladesh. Department of Civil Engineering Nagoya UniversityFuro-choChikusa-kuNagoya 464-8603Japan

Severe bank erosion at lowland rivers in Bangladesh devours vast tract of lands and renders thousands of people homeless at high flood;also,rapid deposition changes bed topographies and seriously reduces navigability at low flow *** groynes and revetments are used to mitigate these problems, but the targeted goal is not achieved as *** study investigates the optimum configuration of a groyne to improve groyne performances at both high flow and low ***-Nays,a two-dimensional model for flow and morphology,is utilized in this study upon confirmation through the detailed experimental *** channel and flow parameters are taken conforming to a typical river of *** different configurations are compared to obtain the optimum *** performance of a groyne is evaluated through three key features - erosion in channel bed(thalweg),deposition in groyne field,and scour near *** computation reveals that the modified groynes function better than the conventional ones in respect of maintenance of navigation channel at low flow and bank protection at high flood as well.

关键词： Alluvial river Bank erosion Thalweg Groyne Main channel

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 Effects of Oxidation States and Spin States of Chromium Interaction with <i>Sargassum Sp</i>.: A Spectroscopic and Density Functional Theoretical Study

引用

Green and Sustainable Chemistry 2021年第4期11卷 125-141页

作者： Mohammad Abdul Matin Md. Aftab Ali Shaikh Md. Anwar Hossain Md. alauddin Tapas Debnath mohammed Abdul Aziz Centre for Advanced Research in Sciences (CARS) Dhaka University Dhaka Bangladesh Department of Chemistry Dhaka University Dhaka Bangladesh National University Gazipur Bangladesh Department of Theoretical and Computational Chemistry Dhaka University Dhaka Bangladesh

The study of various oxidation states of chromium with Sargassum sp. is of particular interest since hexavalent chromium is reduced to trivalent chromium in an aqueous solution. In this study, a systematic density functional theory (DFT) calculations were performed to study the interactions of transition metal chromium ion with different oxidation states and spin states with the Sargassum sp. decorated with carboxylate (acetate) at the wB97XD/6-311++ G(d,p) level of theory. The structures and binding energies of chromium metal-carboxylate complexes at various oxidation states and spin states in gas phase were examined. The coordination strength of Cr(VI) with the acetate ligand was predominantly the strongest compared to the other oxidation states. Vibrational frequency analysis, for the homoleptic monomers of tris [CrIII(AC)3]0 and [CrVI(AC)3]3+ complexes, illustrate good harmony with the experimen

关键词： Transition Metal Time Dependent Density Functional Theory Binding Energy Spectroscopy Electronic Properties and Homoleptic Coordinated Complex

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

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

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：