检索结果-南通市图书馆

ZnO Incorporated Acrylamide Grafted Chitosan Based Composite Film for Advanced Wound Healing Applications

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

Open Journal of Applied Sciences 2024年第4期14卷 1034-1051页

作者： Khodeja Afrin Kaniz Fatema Fariha Afrose Md. abdus samad Azad Md. Shamim Akter Md. Saiful Alam Papia Haque Yeasmin Akter Newaz Mohammed Bahadur Department of Applied Chemistry and Chemical Engineering Noakhali Science and Technology University Noakhali Bangladesh Department of Applied Chemistry and Chemical Engineering University of Dhaka Dhaka Bangladesh

This study was carried out to prepare ZnO nanoparticles incorporated acrylamide grafted chitosan composite film for possible biomedical application especially drug loading in wound healing. ZnO nanoparticles were prepared by co-precipitation method from zinc acetate di-hydrate and incorporated in acrylamide grafted chitosan. FT-IR and TGA of the prepared composite film confirmed the successful incorporation of ZnO nanoparticles in the acrylamide-grafted polymer matrix. SEM images showed that the ZnO nanoparticles were homogeneously distributed on the porous matrix of the composite film. Water uptake and buffer uptake analysis revealed that the composite film could hold water and buffer sufficiently, which facilitated the absorption of exudate from the wound site. Amoxicillin was loaded in the prepared composite film and the maximum loading efficiency was found to be 67.33% with drug concentration of 300 ppm. In vitro studies showed greater antimicrobial activity of drug-loaded composite film compared to both pure film and standard antibiotic disc. Finally, the In vivo mouse model showed maximum healing efficiency compared to conventional gauge bandages because the loading of antibiotic in the film produced a synergistic effect and healing time was reduced.

关键词： Chitosan ZnO Nanoparticles Wound Management Acrylamide Grafting Bacterial Resistance Drug Loading

Analysis and Modeling of Propagation in Tunnel at 3.7 and 28 GHz

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2022年第5期71卷 3127-3143页

作者： Md abdus samad Dong-You Choi Department of Information and Communication Engineering Chosun UniversityGwangju61452Korea Department of Electronics and Telecommunication Engineering International Islamic University ChittagongChittagong4318Bangladesh

In present-day society,train tunnels are extensively used as a means of ***,to ensure safety,streamlined train operations,and uninterrupted internet access inside train tunnels,reliable wave propagation modeling is *** have experimented and measured wave propagation models in a 1674 m long straight train tunnel in South *** measured path loss and the received signal strength were modeled with the Close-In(CI),Floating intercept(FI),CI model with a frequency-weighted path loss exponent(CIF),and alpha-beta-gamma(ABG)models,where the model parameters were determined using minimum mean square error(MMSE)*** measured and the CI,FI,CIF,and ABG modelderived path loss was plotted in graphs,and the model closest to the measured path loss was identified through *** on the measured results,it was observed that every model had a comparatively lower(n<2)path loss exponent(PLE)inside the *** also determined the path loss component’s possible deviation(shadow factor)through a Gaussian distribution considering zero mean and standard deviation calculations of random error *** FI model outperformed all the examined models as it yielded a path loss closer to the measured datasets,as well as a minimum standard deviation of the shadow factor.

关键词： Path loss shadow factor telecommunications train tunnel wave propagation wireless networks

Indirect photocatalytic reduction of arsenate to arsenite in aqueous solution with TiO_2 in the presence of hole scavengers

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2018年第3期26卷 529-533页

作者： abdus samad Shamim Ahsan Ikki Tateishi Mai Furukawa Hideyuki Katsumata Tohru Suzuki Satoshi Kaneco Department of Chemistry Jagannath University Department of Earth and Atmospheric Sciences Metropolitan State University of Denver Department of Chemistry for Materials Graduate School of Engineering Mie University Mie Global Environment Center for Education & Research Mie University

The indirect photocatalytic reduction of arsenate to arsenite in aqueous solution with titanium dioxide(TiO_2)was investigated with various hole scavengers such as methanol, ethanol, 2-propanol, formaldehyde, acetone,formic acid and acetic acid. Although the direct photocatalytic reduction of arsenate to arsenite with TiO_2 was impossible, an indirect reduction of As(V) was possible in the presence of sacrificial electron donors to form strongly reductive radicals. The addition of ethanol was very effective for indirect photocatalytic reduction of As(V) in aqueous solution with TiO_2 photocatalyst. The indirect photocatalytic reduction rate of As(V) may be related with both the reaction rate constants of reaction of hydroxyl radicals with hole scavenger and the reactivities for the radicals M· which are produced by the reaction of ·OH with hole scavenger.

关键词：亚砷酸盐 TiO2 间接水反应率二氧化物光催化剂分子

Predictive car-following scheme for improving traffic flows on urban road networks

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

Control Theory and Technology 2019年第4期17卷 325-334页

作者： A.S.M.BAKIBILLAH Mahmudul HASAN Md Mustafijur RAHMAN Md abdus samad KAMAL School of Engineering Monash UniversityBandar SunwaySelangorMalaysia Technology Operations Department Grameenphone Ltd.DhakaBangladesh Department of Electrical and Electronic Engineering Manarat International UniversityDhakaBangladesh Division of Mechanical Science and Technology Graduate School of Science and TechnologyGunma UniversityJapan

Driving behavior is one of the main reasons that causes bottleneck on the freeway or restricts the capacity of signalized *** paper proposes a car-following scheme in a model predictive control(MPC)framework to improve the traffic flow behavior,particularly in stopping and speeding up of individual vehicles in dense urban traffic under a connected vehicle(CV)*** information received through vehicle-to-vehicle(V2V)communication,the scheme predicts the future states of the preceding vehicle and computes the control input by solving a constrained optimization problem considering a finite future *** objective function is to minimize the weighted costs due to speed deviation,control input,and unsafe *** scheme shares the planned driving information with the following vehicles so that they can make better cooperative driving *** proposed car-following scheme is simulated in a typical driving scenario with multiple vehicles in dense traffic that has to stop at red signals in multiple *** speeding up or queue clearing and stopping characteristics of the traffic using the proposed scheme is compared with the existing car-following scheme through numerical simulation.

关键词： Car-following scheme model predictive control vehicle string connected vehicle environment distributed control

Preparation and Characterization of Alkyd Resins Based on Citrullus colocynthis Seed Oil

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Renewable Materials 2018年第6期6卷 651-661页

作者： Hassen Mohamed Sbihi Hamid Shaikh Lahssen El Blidi Imed Arbi Nehdi Ubair abdus samad Moufida Romdhani-Younes Saud Ibrahim Al-Resayes King Saud University College of ScienceChemistry DepartmentP.O.Box 2454Riyadh 1145Saudi Arabia King Saud University Chemical Engineering DepartmentP.O.Box 800Riyadh 11421Saudi Arabia Laboratory of Structural Organic Chemistry Department of ChemistryFaculty of Sciences of TunisUniversity of Tunis El Manar2092TunisTunisia

In this study,different samples of alkyd resins based on Citrullus colocynthis seed oil(CCSO)—which has a high content of linoleic acid—were prepared as a renewable raw ***(I),medium(II),and long(III)alkyd resins were synthesized using oil,glycerol,and phthalic anhydride(PA)in different *** mahaleb seed oil(PMSO),which contains conjugated linolenic acid,was blended with CCSO in different proportions to examine the effect of PMSO on the film properties of alkyd resins(IV and V).All synthesized resins were characterized by FTIR and 1H NMR spectroscopic *** resins were also cured by an epoxy resin and their film properties(pencil hardness,adhesion,gloss,and chemical resistance)were *** of these alkyds reveals that CCSO can be used as a new potential raw material for coating applications.

关键词： Citrullus colocynthis seed oil Prunus mahalab seed oil alkyd resin alcoholysis-polyesterification renewability

MHD Free Convection Flow past an Inclined Stretching Sheet with Considering Viscous Dissipation and Radiation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Fluid Dynamics 2017年第2期7卷 152-168页

作者： Maruf Hasan Enamul Karim abdus samad Department of Mathematics Comilla University Comilla Bangladesh Department of Applied Mathematics University of Dhaka Dhaka Bangladesh

The present study concentrates on the analysis of MHD free convection flow past an inclined stretching sheet. The viscous dissipation and radiation effects are assumed in the heat equation. Approximation solutions have been derived for velocity, temperature, concentration, Nusselt number, skin friction and Sherwood number using Nachtsheim-Swigert shooting iteration technique along with the six-order Runge-Kutta iteration scheme. Graphs are plotted to find out the characteristics of different physical parameters. The variations of physical parameters on skin friction coefficient, Nusselt number and Sherwood number are displayed via table.

关键词： Viscous Dissipation Magnetic Field Skin Friction Eckert Number

Effect of Brownian Diffusion on Squeezing Elastico-Viscous Nanofluid Flow with Cattaneo-Christov Heat Flux Model in a Channel with Double Slip Effect

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Applied Mathematics 2020年第4期11卷 277-291页

作者： Md Enamul Karim Md abdus samad Department of Applied Mathematics University of Dhaka Dhaka Bangladesh Department of Mathematics Comilla University Cumilla Bangladesh

The present study deals with the analysis of heat transfer of the unsteady Maxwell nanofluid flow in a squeezed rotating channel of a porous extensile surface subject to the velocity and thermal slip effects incorporating the theory of heat flow intensity of Cattaneo-Christov model for the expression of the energy distribution in preference to the classical Fourier’s law. A set of transformations is occupied to renovate the current model in a system of nonlinear ordinary differential equations that are numerically decoded with the help of MATLAB integrated function bvp4c. The effects of various flow control parameters are investigated for the momentum, temperature and diffusion profiles, as well as for the wall shearing stress and the heat and mass transfer. The results are finally described from the material point of view. A comparison of heat flux models of Cattaneo-Christov and Fourier is also performed. An important result from the present work is that the squeezing parameter is strong enough in the middle of the channel to retard the fluid flow.

关键词： Maxwell Fluid Model Squeezing Flow Elastico-Viscous Nanofluid Channel Rotation

基于有限元方法的稳压器波动管热应力特性分析

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

基于有限元方法的稳压器波动管热应力特性分析

作者： Muhammad abdus samad 华北电力大学(北京)

学位级别：硕士

热分层是不同温度的流体在同一结构中共存的现象。温度高、密度小的流体位于上层,同理,温度低的流体位于下层。由于顶部和底部热膨胀差,导致了流体结构的显著变形。在热电厂中,一般情况下管道是被固定的,因此热分层引起的变形会导致管... 详细信息

热分层是不同温度的流体在同一结构中共存的现象。温度高、密度小的流体位于上层,同理,温度低的流体位于下层。由于顶部和底部热膨胀差,导致了流体结构的显著变形。在热电厂中,一般情况下管道是被固定的,因此热分层引起的变形会导致管道发生意想不到的移动,从而在管道的轴向、周向和径向产生过大的应力,这可能会超过疲劳和应力的设计极限。本文利用 CFD软件(ANSYS CFX)和有限元求解程序(ANSYS MECHANICAL)对压水堆稳压器波动管线进行了分析。首先在ICEM软件中设计了波动管线网格模型,并在稳态分析中对其性能进行了测试。选用对变化最不敏感的网格模型,并将温度曲线导入到有限元求解程序中。它们的结构分析代码用于确定施加在管道上的热应力以及结构的响应特性。此外,在瞬态热分析中还研究了喘振工况下波动管线的温度分布。结果表明,在主管道和稳压器的边界存在较大的稳态应力,应力引起的管道形变使波动管线的中心产生了较大的位移。另外,根据本文所评估的瞬态温度曲线,还计划计算出波动管充满热水时的瞬态情况下的应力分布。

关键词：稳压器波动管流固耦合热应力 ANSYS CFD分析

Potential bioactive phytochemicals, antioxidant properties and anticancer pathways of Nymphaea nouchali

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Biomedicine 2020年第12期10卷 555-562页

作者： Md.Nazim Uddin Md.abdus samad Md.Abu Zubair Md.Zahurul Haque Kanika Mitra Tanzir Ahmed Khan Md.Amir Hossain Ashikujaman Syed Aklima Afroze Institute of Food Science and Technology Bangladesh Council of Scientific and Industrial ResearchDhaka 1205Bangladesh School of Basic Medicine and Clinical Pharmacy China Pharmaceutical UniversityNanjingJiangsu 211198China Department of Food Technology and Nutritional Science Mawlana Bhashani Science and Technology UniversitySantoshTangail 1902Bangladesh Center for New Drug Safety Evaluation and Research China Pharmaceutical UniversityJiangsuNanjing 211198China School of Pharmacy Lanzhou UniversityLanzhou 730000China School of Pharmacy China Pharmaceutical UniversityNanjingJiangsu 211198China

Objective:To investigate bioactive phytochemicals and antioxidant activities of Nymphaea nouchali and to explore its anticancer pathways by a network pharmacology ***:Using a spectrophotometer and high-performance liquid chromatography-diode array detector(HPLC-DAD),we quantified bioactive phytochemicals in methanolic extract of Nymphaea nouchali *** extracts were investigated for in vitro antioxidant *** of these bioactive phytochemicals were predicted and anticancer-associated pathways were analyzed by a network pharmacology ***,we identified the predicted genes associated with cancer pathways and the hub genes in the protein-protein interaction network of predicted ***:Quantitative results indicated the total phenolics,total flavonoids,and total proanthocyanidins in the methanolic extract of Nymphaea nouchali ***-DAD analysis showed rutin(39.44 mg),catechin(39.20 mg),myricetin(30.77 mg),ellagic acid(11.05 mg),gallic acid(3.67 mg),vanillic acid(0.75 mg),rosmarinic acid(4.81 mg),p-coumaric acid(3.35 mg),and quercetin(0.90 mg)in 1 g of dry *** extract showed the radical scavenging activities of 2,2-diphenyl-1-picrylhydrazyl,2,2’-azinobis(3-ethylbenzothiazoline-6-sulfonic acid)and N,*** using network pharmacology,we predicted 130 target genes associated with cancer *** top hub genes(IL6,AKT1,EGFR,JUN,PTGS2,MAPK3,CASP3,and CXCL8)were also identified,which were associated with cancer pathways and interacted with bioactive phytochemicals of the methanolic extract of Nymphaea nouchali ***:Our study provides insights into the mechanism of anticancer activities of the methanolic extract of Nymphaea nouchali tuber.

关键词： Bioactive phytochemicals Anticancer pathways Malignancy Network pharmacology Nymphaea nouchali