Journal of Materials Science Research最新文献_第9页

The Collective Radioactive Decay of Atomic Nuclei Initiated by an External Mechanical Impact: Science Fiction or a New Class of Physical Processes 由外部机械冲击引起的原子核集体放射性衰变:科幻小说或一类新的物理过程

Journal of Materials Science Research Pub Date : 2018-03-30 DOI: 10.5539/JMSR.V7N2P34

M. K. Marakhtanov, V. Okunev

引用次数: 5

Nanoindentation Investigation on Chitosan Thin Films with Different Types of Nano Fillers 不同类型纳米填料对壳聚糖薄膜纳米压痕的影响

Journal of Materials Science Research Pub Date : 2018-02-27 DOI: 10.5539/JMSR.V7N2P11

I. Fahim, N. Aboulkhair, N. Everitt

{"title":"Nanoindentation Investigation on Chitosan Thin Films with Different Types of Nano Fillers","authors":"I. Fahim, N. Aboulkhair, N. Everitt","doi":"10.5539/JMSR.V7N2P11","DOIUrl":"https://doi.org/10.5539/JMSR.V7N2P11","url":null,"abstract":"Chitosan nanocomposite thin films were fabricated using two types of chitosan natural polymer (cross-linked chitosan (CLCS) and non-cross-linked chitosan (NCLCS)), with three different weight percentages nano-fillers (Graphene (G) and fullerene (F)). Nanoindentation tests were performed to investigate the local mechanical properties of the produced nanocomposite in comparison to the unreinforced chitosan thin films. Nano hardness values (H) and indentation modulus (E) were measured using 5 and 10 µm spherical indenters. The addition of nano fillers enhanced the hardness of both types of films with the amount of hardening being directly proportional to the fraction of nano filler added(p<0.001). Crosslinking has also significantly increased the hardness (p< 0.001). The larger indentation returned a lower hardness. The use of different radii nano indenters underlined the indenter size effect due to the differing strain fields. The promising mechanical properties resulting from this research will allow using the fabricated nanocomposites for tissue engineering, biomedicine, drug delivery, electronics, energy, surface coatings and packaging applications.","PeriodicalId":16111,"journal":{"name":"Journal of Materials Science Research","volume":"6 1","pages":"11"},"PeriodicalIF":0.0,"publicationDate":"2018-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88678998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Experimental Behavior of FRP Confined Concrete Cylinder Wrapped by Two Different FRPs 两种不同FRP包覆FRP约束混凝土筒体的试验性能

Journal of Materials Science Research Pub Date : 2018-02-27 DOI: 10.5539/JMSR.V7N2P18

Ataur Rahman, Madhobi Mallick, Shantanu Ghosh

{"title":"Experimental Behavior of FRP Confined Concrete Cylinder Wrapped by Two Different FRPs","authors":"Ataur Rahman, Madhobi Mallick, Shantanu Ghosh","doi":"10.5539/JMSR.V7N2P18","DOIUrl":"https://doi.org/10.5539/JMSR.V7N2P18","url":null,"abstract":"This paper presents the results of experimental investigation on concrete cylinders confined with two different types of fiber reinforced polymer (FRP) sheets, they are: synthetic high strength CFRP composites and composites using natural fiber like Jute. These two FRPs are very much distinct with respect to their strength and recycle properties. Conventional FRPs like CFRP possess superior mechanical strength than natural FRPs, but have got some serious drawbacks such as high density, high cost and poor recycling and non-biodegradable properties. On the other hand, the durability of the natural fibers can be enhanced by mummification of the fibers within the epoxy resin. An experimental study was conducted, where twenty six small scale cylindrical concrete specimens (100 × 200 mm) were subjected to uniaxial compression up o failure and the corresponding stress-strain behaviors were observed. The ultimate failure load and the deformation at peak load were the two important observations. The results demonstrate that a significant increase in the compressive strength can be achieved by confining the concrete with CFRP but both strength and ductility are compromised when concrete is wrapped with JUTE-FRP. However, JUTE-FRP shows reasonably good ductile behavior for the case of low strength concrete and can safely be used for brick masonry column. For low cost strengthening work, JUTE-FRP can be an alternative for low strength concrete and masonry works.","PeriodicalId":16111,"journal":{"name":"Journal of Materials Science Research","volume":"38 1","pages":"18"},"PeriodicalIF":0.0,"publicationDate":"2018-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82679994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Shear Resisting Mechanism and Shear Strength Equation for Sandwich Beams 夹芯梁抗剪机理及抗剪强度方程

Journal of Materials Science Research Pub Date : 2018-01-31 DOI: 10.5539/JMSR.V7N2P1

Ataur Rahman, T. Ueda

引用次数: 3

Surface Characterization of Cottonseed Meal Products by SEM, SEM-EDS, XRD and XPS Analysis 用SEM, SEM- eds, XRD和XPS分析表征棉籽粕产品的表面特征

Journal of Materials Science Research Pub Date : 2017-12-29 DOI: 10.5539/JMSR.V7N1P28

Zhongqi He, H. N. Cheng, O. M. Olanya, J. Uknalis, Xiaodong Zhang, B. Koplitz, Jibao He

{"title":"Surface Characterization of Cottonseed Meal Products by SEM, SEM-EDS, XRD and XPS Analysis","authors":"Zhongqi He, H. N. Cheng, O. M. Olanya, J. Uknalis, Xiaodong Zhang, B. Koplitz, Jibao He","doi":"10.5539/JMSR.V7N1P28","DOIUrl":"https://doi.org/10.5539/JMSR.V7N1P28","url":null,"abstract":"The utilization of cottonseed meal products as valuable industrial materials needs to be exploited. We have recently produced water-washed cottonseed meal, total cottonseed protein, sequentially extracted water- and alkali-soluble proteins, and two residues after the total and sequential protein extractions at a pilot scale. In this work, the surface characteristics of the six cottonseed meal products were examined by scanning electron microscopy (SEM), scanning electron microscopy- energy dispersive spectrometer (SEM-EDS), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The results showed that the surface properties of the six products differed from those of a commercial soy protein flour examined comparatively in this work. The compact morphology and relative-high N composition were observed in all three protein products, with greater similarity between the total protein and alkali-soluble protein. The surfaces of the two residue products were more porous with polysaccharide features. Washed cottonseed meal possessed the surface features similar to those of the residues. In the meantime, the N-associated functional groups were under-represented in the surfaces of all samples, compared to their bulk composition. Information derived from this work increased the understanding of the surface functional properties of cottonseed meal products, which would benefit their practical utilization.","PeriodicalId":16111,"journal":{"name":"Journal of Materials Science Research","volume":"13 1","pages":"28"},"PeriodicalIF":0.0,"publicationDate":"2017-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84342901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 19

Synthesis and Characterization of Aluminium Base in situ Metal Matrix Composites by Spark Plasma Sintering 火花等离子烧结铝基原位金属基复合材料的合成与表征

Journal of Materials Science Research Pub Date : 2017-12-29 DOI: 10.5539/JMSR.V7N1P14

B. Mallik, K. Sikdar, D. Roy

引用次数: 0

Ionizing Radiations (Alpha, Beta, Gamma) Effects on CdS / P-Si Heterojunction Solar Cell for Electrical and Optical Properties 电离辐射(α， β， γ)对CdS / P-Si异质结太阳能电池电学和光学性能的影响

Journal of Materials Science Research Pub Date : 2017-12-29 DOI: 10.5539/JMSR.V7N1P20

A. El-Amin, M. H. Saad

{"title":"Ionizing Radiations (Alpha, Beta, Gamma) Effects on CdS / P-Si Heterojunction Solar Cell for Electrical and Optical Properties","authors":"A. El-Amin, M. H. Saad","doi":"10.5539/JMSR.V7N1P20","DOIUrl":"https://doi.org/10.5539/JMSR.V7N1P20","url":null,"abstract":"The effect of ionizing radiations (Alpha, Beta, Gamma) in CdS/p-Si heterojunction solar cells are discussed in this paper. The short-circuit current density parameters before Gamma irradiation conditions have been improved up to 35 mA/cm2 and after Gamma irradiation was 30 mA/cm2. The open circuit voltage before Gamma irradiation was 0.59 and 0.565 V after Gamma irradiation. The limitations of these devices were discussed by investigating the dependence of electrical and efficiency parameters in function of radiation time. The efficiency of the cell before radiation was equal to (11.2%) whenever, after the impact of both Alpha, Beta, and Gamma was follows, 4.7, 4.9, and 5.1% respectively. The fill factor before and after Gamma irradiation was 54.5 and 53 %. Studying and analyzing the cells using the I-V, with the change of time rate of Gamma radiation played a critical role in reducing the efficiency of solar cells. The campaign was carried out with different doses of a series of solar cells by exposing them to different time. The deterioration parameters of CdS/p-Si solar cells by Gamma radiation led to strongly supports the results of minority carrier lifetime, which clearly showed diminishing minority carrier lifetime with increasing radiation dose.","PeriodicalId":16111,"journal":{"name":"Journal of Materials Science Research","volume":"45 1","pages":"20"},"PeriodicalIF":0.0,"publicationDate":"2017-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87278208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Improvement in Photochromic Property of Nickel Oxide-Based Photochromic Composite Films by Cobalt Addition 钴对氧化镍基光致变色复合薄膜光致变色性能的改善

Journal of Materials Science Research Pub Date : 2017-12-28 DOI: 10.5539/JMSR.V7N1P9

H. Miyazaki, Narumi Eimori, T. Matsuura, T. Ota

引用次数: 3

DNA Origami as a Tool to Design Asymmetric Gold Nanostructures DNA折纸作为设计不对称金纳米结构的工具

Journal of Materials Science Research Pub Date : 2017-12-06 DOI: 10.5539/JMSR.V7N1P1

G. Amoako, Zhou Ming, M. J. Eghan, S. S. Sackey

引用次数: 1

Influence of Water Activity on Protease Adsorbed on Biochar in Organic Solvents 水活性对有机溶剂中生物炭吸附蛋白酶的影响

Journal of Materials Science Research Pub Date : 2017-09-28 DOI: 10.5539/JMSR.V6N4P96

H. Noritomi, Jumpei Nishigami, N. Endo, Satoru Kato, K. Uchiyama

{"title":"Influence of Water Activity on Protease Adsorbed on Biochar in Organic Solvents","authors":"H. Noritomi, Jumpei Nishigami, N. Endo, Satoru Kato, K. Uchiyama","doi":"10.5539/JMSR.V6N4P96","DOIUrl":"https://doi.org/10.5539/JMSR.V6N4P96","url":null,"abstract":"We have found that the organic solvent-resistance of Alpha-chymotrypsin (Alpha-CT) is enhanced by adsorbing Alpha-CT onto bamboo charcoal powder (BCP), which is obtained by pyrolyzing bamboo waste under nitrogen atmosphere, and is markedly dependent on the thermodynamic water activity (aw) in organic solvents. When BCP-adsorbed　Alpha-CT was immersed in acetonitrile at an appropriate water activity, it effectively enhanced the transesterification of N-acetyl-L-tyrosine ethyl ester (N-Ac-Tyr-OEt) with n-butanol (BuOH) to produce N-acetyl-L-tyrosine butyl ester (N-Ac-Tyr-OBu), compared to the hydrolysis of N-Ac-Tyr-OEt with water to give N-acetyl-L-tyrosine (N-Ac-Tyr-OH). When the water activity was 0.28, the initial rate of transesterification catalyzed by BCP-adsorbed Alpha-CT was about sixty times greater than that catalyzed by free Alpha-CT. Regarding the reaction selectivity which is defined as a ratio of the initial rate of transesterification to that of hydrolysis, BCP-adsorbed α-CT was much superior to free Alpha-CT. The catalytic activity of BCP-adsorbed Alpha-CT was markedly dependent on the reaction temperature. Furthermore, concerning the thermal stability at 50 oC, the half-life of BCP-adsorbed Alpha-CT exhibited 3.8-fold, compared to that of free Alpha-CT.","PeriodicalId":16111,"journal":{"name":"Journal of Materials Science Research","volume":"17 1","pages":"96"},"PeriodicalIF":0.0,"publicationDate":"2017-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85990950","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5