排序方式: 共有3条查询结果,搜索用时 15 毫秒
1
1.
Polypropylene/multiwall carbon nanotubes nanocomposites: Nanoindentation,dynamic mechanical,and electrical properties
下载免费PDF全文
![点击此处可从《应用聚合物科学杂志》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Achmad Chafidz Wara Dyah Pita Rengga Rawaiz Khan Mujtahid Kaavessina Abdulaziz M. Almutlaq Waheed A. Almasry Abdelhamid Ajbar 《应用聚合物科学杂志》2017,134(37)
Polypropylene (PP)/Multiwall carbon nanotubes (MWCNTs) nanocomposites were fabricated via melt compounding that utilizes a corotating twin‐screw extruder. Two commercially available MWCNTs, Baytubes C150P and C70P, were incorporated into PP matrix at concentration of 3 wt %. The nanocomposites samples were analyzed using scanning electron microscopy, dynamic mechanical analysis (DMA), nanoindentation test, and picoammeter. It was found that both MWCNTs types were well distributed and dispersed in the PP matrix and no agglomeration of MWCNTs was observed. The DMA analysis results showed that the incorporation of MWCNTs enhanced the storage modulus and thermal stability of the PP matrix. Whereas, nanoindentation creep results showed that the creep rate and displacement of the PP/MWCNTs nanocomposites was lower than the neat PP, in which C70P < C150P < PP. The reduction of creep rate and creep displacement was associated to the improvement of creep resistance. There were also improvements on hardness and stiffness of the nanocomposites. Additionally, the electrical resistivity of the neat PP decreased with the incorporation of MWCNTs. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134, 45293. 相似文献
2.
Moudhi Almutlaq Fatmah A. Mansour Jahad Alghamdi Yassen Alhendi Abir Abdullah Alamro Amani Ahmed Alghamdi Hassan S. Alamri Fayhan Alroqi Tlili Barhoumi 《International journal of molecular sciences》2022,23(15)
Dysregulation of renin−angiotensin systems during coronavirus disease 2019 (COVID-19) infection worsens the symptoms and contributes to COVID-19 severity and mortality. This study sought to investigate the effect of exogenous angiotensin II (Ang-II) on severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2)-specific T-cells response in recovered COVID-19 patients. Human peripheral blood mononuclear cells (PBMCs) were treated with Ang II and then stimulated with a SARS-CoV-2 peptide pool. T-cell responses were measured using flow cytometry, while enzyme-linked immunosorbent assay (ELISA) and intracellular cytokine staining (ICS) assays determined functional capability and polarization. Additionally, the relative level of protein phosphorylation was measured using a phosphokinase array. Our results showed that Ang II treatment significantly increased the magnitude of SARS-CoV-2-specific T-cell response in stimulated PBMCs with a SARS-CoV-2 peptide pool. Moreover, the phosphorylation levels of numerous proteins implicated in cardiovascular diseases, inflammation, and viral infection showed significant increases in the presence of Ang II. The mitogenic stimulation of PBMCs after Ang II and SARS-CoV-2 peptide pool stimulation showed functional polarization of T-cells toward Th1/Th17 and Th17 phenotypes, respectively. Meanwhile, ELISA showed increased productions of IL-1β and IL-6 in Ang II-stimulated PBMCs without affecting the IL-10 level. To our knowledge, this study is the first to demonstrate that Ang II exaggerates SARS-CoV-2-specific T-cells response. Therefore, during COVID-19 infection, Ang II may aggravate the inflammatory response and change the immune response toward a more inflammatory profile against SARS-CoV-2 infection. 相似文献
3.
An algebraic approach to targeting waste discharge and impure fresh usage via material recycle/reuse networks 总被引:5,自引:5,他引:0
Abdulaziz M. Almutlaq Vasiliki Kazantzi Mahmoud M. El-Halwagi 《Clean Technologies and Environmental Policy》2005,7(4):294-305
This paper introduces an algebraic procedure that targets material-recycle networks. The problem involves the allocation of
process streams and fresh sources to process units (sinks) with the objective of minimizing fresh usage and waste discharge.
First, observations from the graphical targeting approach are transformed into algebraic insights. Then, a geometrical transformation
is developed to account for the possibility of using impure fresh resources. These insights and geometrical transformations
are arranged through a cascade analysis, which identifies and adjusts any recycle infeasibilities so as to maximize the recycle
opportunities. A systematic non-iterative algebraic approach is developed to identify rigorous targets for minimum usage of
impure fresh resources, maximum recycle of process resources and minimum discharge of waste. These targets are identified
a priori and without commitment to the detailed design of the recycle/reuse network. The approach is valid for both pure and
impure fresh resources. The devised procedure also identifies the location of the material-recycle pinch point and addresses
its significance in managing process sources, fresh usage, and waste discharge. Two case studies are solved to illustrate
the ease, rigor, and applicability of the developed targeting technique and its relationship to graphical targeting techniques. 相似文献
1