Results 31 to 40 of about 469,021 (245)

اثر اصلاح کنند ه ها روی فعالیت کاتالیزورهای زیگلر-ناتا و خواص نهایی پلیمر در پلیمرشدن اولفین ها [PDF]

Baspārish, 2015
فعالیت کاتالیزور از مهم ترین پارامترها در فرایندهای پلیمرشدن است. برای یک سامانه کاتالیزوریفعالیت ممکن است به شرایط پلیمرشدن از قبیل دما و فشار وابسته باشد.
رضا بازوند, نعیمه بحری, مهدی نکومنش, حسین عابدینی   +3 more
doaj   +1 more source

Effect of Doping Microcapsules on Typical Electrical Performances of Self-Healing Polyethylene Insulating Composite

Applied Sciences, 2019
Polyethylene cables, as important transmission equipment of modern power grid, would inevitably be slightly damaged, which seriously threatens the safety of the power supply.
Youyuan Wang, Yudong Li, Zhanxi Zhang, Yanfang Zhang   +3 more
doaj   +1 more source

Thermal Treatment of Melt-Spun Fibers Based on High Density PolyEthylene and Lignin

C, 2017
The purpose of this study was the synthesis of novel low-cost carbon fibers along with the investigation of the optimal parameters of temperature and time for the stabilization of hybrid high-density polyethylene (HDPE) and lignin melt-spun fibers. These
Panagiotis Goulis, Giorgos Konstantopoulos, Ioannis A. Kartsonakis, Konstantinos Mpalias, Stavros Anagnou, Dimitrios Dragatogiannis, Costas Charitidis   +6 more
doaj   +1 more source

Structural insights and therapeutic targets in Acinetobacter baumannii capsule biosynthesis

FEBS Letters, EarlyView.
Hypervirulent KL49 A. baumannii's capsular polysaccharide contains the nonulosonic acid 8‐epi‐Leg5,7Ac2, synthesized by epimerization via ElaA, ElaB, and ElaC. Crystal structures of ElaA, ElaB, and ElaC reveal their role in CMP‐Leg5,7Ac2 synthesis and regioselective C8 epimerization.
Woo Cheol Lee, Junho Jeong, Chae Yeong Lee, Hyunjoon Cho, Man Hwan Oh, Je Chul Lee, Jee‐Young Lee, Yangmee Kim   +7 more
wiley   +1 more source

Decay of Electric Charge on Corona Charged Polyethylene

, 2007
In this paper, the surface potential decay of corona-charged low density polyethylene (LDPE) films has been investigated. It has been found that for the same sample thickness the faster decay occurs in the sample with a higher charging voltage.
Zhiqiang Xu, Xu, Z, Zhang, L, G Chen, XU, Zhiqiang, Chen, G, Zhang, Linwen, Linwen Zhang, Chen, George   +8 more
core   +2 more sources

Space charge behaviours in polyethylene under combined AC and DC electric fields

, 2014
Polyethylene has been one of the widely studied polymeric insulation materials. One of the major issues related to polymeric materials is the easy formation of space charge which may cause electric field enhancement. In this paper, a numerical simulation
C. Zhou, Zhou, Churui, G. Chen, Chen, George   +3 more
core   +2 more sources

Research of the polyethylene packaging layer structure change in contact with a food product at exposure to ultraviolet radiation

Пищевые системы, 2021
The sanitary and hygienic safety of modern packaging is determined by the layer of packaging material in direct contact with the food product. This layer in most cases is a synthetic polymer of the polyolefin class — low density polyethylene.
O. B. Fedotova, N. S. Pryanichnikova
doaj   +1 more source

Reconstructing enzyme evolution by protein engineering

FEBS Letters, EarlyView.
Natural enzyme evolution can be retraced by protein engineering methods such as directed evolution, rational design, and ancestral sequence reconstruction. These approaches reveal how enzymes emerged from ligand‐binding scaffolds, developed varying substrate preferences, formed oligomeric complexes, adapted to environmental changes, and evolved novel ...
Lukas Drexler, Markus R. Busch, Reinhard Sterner   +2 more
wiley   +1 more source

Decoding the dynamic extracellular matrix in cancer—3D models and bioscaffolds rewire the rules of tumor progression

FEBS Letters, EarlyView.
Cancer progression is regulated by the dynamic matrix code of the tumor microenvironment, which influences cellular behavior and disease development. Importantly, matrix remodeling in three‐dimensional cancer models more accurately reflects in vivo conditions compared to conventional two‐dimensional systems.
Sylvia Mangani, Konstantinos Spanopoulos, Zoi Piperigkou, Nikos K. Karamanos   +3 more
wiley   +1 more source

A novel method for interfacial energy gap determination

Scientific Reports
A precise quantification of energy gap for a molecular semiconductor is crucial. However, there has always been a lack of a suitable method which results in an inaccurate measurement.
Xuehua Zhou, Yushu Chen, Qingxia Li, Shixing Yang, Chao Han   +4 more
doaj   +1 more source