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The Effect of In situ Melt Pre-shear Induced Oriented Precursors on the Crystallization of Poly(1-butene)/Polypropylene Blends

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Chinese Journal of Polymer Science 2024年第12期42卷 2011-2020,I0012页

作者： wen-kang Wei Jing-Jing Zhao Chen-Guang Liu Dong Wang Ai-Hua He Shandong Provincial Key Laboratory of Olefin Catalysis and Polymerization Key Laboratory of Rubber-Plastics(Ministry of Education)School of Polymer Science and EngineeringQingdao University of Science and TechnologyQingdao266042China State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing100029China

Melt pre-shear induced crystallization of polymer blends holds great significance in industrial processing and product *** this work,two typical PB/PP blends(50/50,90/10),possessing commercial value and academic hotspot,were employed to investigate the effect of melt pre-shear on the crystallization of isotactic poly(1-butene)(PB)and polypropylene(PP)by applying shearing slightly above the melting temperature of PP with subsequent non-isothermal crystallization to simulate actual processing *** was discovered that in PB/PP(90/10)blend,in situ melt pre-shear generated oriented PP precursors induced the formation of PP-FIC(Flow-induced crystallization)which acted as row crystal nucleus significantly promoting PB crystallization into spherulite with higher melting temperatures(T_(m)),crystallinity(X_(c)),and thicker lamellar thickness(d_(c)).While in PB/PP(50/50)blend,the melt pre-shear generated PP-shish precursors induced the formation of PP shish-kebab that exerted a confining effect on the crystal growth of PB,resulting in truncated spherulite formation with higher T_(m) and thicker d_(c) but lower X_(c).This research provides insight into the mechanism underlying oriented crystal structure formation,crystal properties,and phase morphology of PB/PP blends under melt pre-shear fields,which have significant theoretical and practical implications for their industrial processing and preparation of high-performance products.

关键词： Meltpre-shear PB/PPblends Precursors Crystallization

Study of Enhanced Fine Coal De-sulphurization and De-ashing by Ultrasonic Flotation

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Journal of China University of Mining and Technology 2007年第3期17卷 358-362页

作者： kang wen-ze XUN Hai-xin CHEN Jun-tao School of Resource and Environment Heilongjiang Institute of Science and Technology Harbin Heilongjiang 150027 China

The feasibility of using ultrasound to enhance the performance of de-sulphurization and de-ashing during slime flotation was investigated. The Setararn C80 calorimeter, the contact angle gauge DCAT21 and an electrophoresis apparatus were used to study the surface nature of coal, pyrite and refuse before and after ultrasonic conditioning. The yield, ash and sulfur contents of equally sized coal slimes were also measured before and after ultrasonic conditioning. The results show that ultrasonic conditioning can drive the separation of pyrite and refuse from coal. After ultrasonic conditioning the hydrophobicity of coal and hydrophilicity of pyrite and refuse increase. The perfect index of flotation, the perfect index of de-sulphurization and the percentage of de-sulphurization increase by 22.51%, 25.36% and 2.49%, respectively. This study shows that ultrasonic conditioning can enhance the performance of de-sulphurization and de-ashing of coal flotation methods.

关键词： ultrasonic separating hydrophobicity de-sulphurization de-ashing

Mechanisms of ductular reaction in non-alcoholic steatohepatitis

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World Journal of Gastroenterology 2022年第19期28卷 2088-2099页

作者： Yue Chen wen-kang Gao Yan-Yun Shu Jin Ye Division of Gastroenterology Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022Hubei ProvinceChina

Non-alcoholic fatty liver disease(NAFLD)is a disease spectrum caused in part by insulin resistance and genetic *** disease is primarily characterized by excessive lipid accumulation in hepatocytes in the absence of alcohol abuse and other causes of liver ***,NAFLD is divided into several periods:simple steatosis,non-alcoholic steatohepatitis(NASH),hepatic fibrosis,cirrhosis,and hepatocellular *** the increasing prevalence of obesity and hyperlipidemia,NAFLD has become the main cause of chronic liver disease *** a result,the pathogenesis of this disease is drawing increasing *** reaction(DR)is a reactive bile duct hyperplasia caused by liver injury that involves hepatocytes,cholangiocytes,and hepatic progenitor ***,DR is shown to play a pivotal role in simple steatosis progression to NASH or liver fibrosis,providing new research and treatment *** study reviews several DR signaling pathways,including Notch,Hippo/YAP-TAZ,Wnt/β-catenin,Hedgehog,HGF/c-Met,and TWEAK/Fn14,and their role in the occurrence and development of NASH.

关键词： Non-alcoholic fatty liver disease Non-alcoholic steatohepatitis Ductular reaction Mechanisms Signaling pathways

Nd–Mg–Ni alloy electrodes modified by reduced graphene oxide with improved electrochemical kinetics

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International Journal of Minerals,Metallurgy and Materials 2020年第3期27卷 391-400页

作者： Yuan Li Li-na Cheng wen-kang Miao Chun-xiao Wang De-zhi Kuang Shu-min Han Hebei Key Laboratory of Applied Chemistry School of Environmental and Chemical EngineeringYanshan UniversityQinhuangdao 066004China State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China Hunan Corun New Energy Co. Ltd.Changsha 410205China

To improve the electrochemical kinetics of Nd–Mg–Ni alloy electrodes, the alloy surface was modified with highly conductive reduced graphene oxide(rGO) via a chemical reduction process. Results indicated that rGO sheets uniformly coated on the alloy surface, yielding a threedimensional network layer. The coated surfaces contained numerous hydrophilic functional groups, leading to better wettability of the alloy in aqueous alkaline media. This, in turn, increased the concentration of electro-active species at the interface between the electrode and the electrolyte, improving the electrochemical kinetics and the rate discharge of the electrodes. The high rate dischargeability at 1500 mA·g^(–1) increased from 53.2% to 83.9% after modification. In addition, the modification layer remained stable and introduced a dense metal oxide layer to the alloy surface after a long cycling process. Therefore, the protective layer prevented the discharge capacity from quickly decreasing and improved cycling stability.

关键词： hydrogen storage alloys surface modification graphene oxide electrochemical properties kinetics

Mechanism of aluminum complexation in oxidative activity of leaching bacteria in a fluoride-containing bioleaching system

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Rare Metals 2019年第1期38卷 87-94页

作者： Xiang Li Jian-kang wen Xiao-Lan Mo Wu Biao Dian-Zuo Wang Hong-Ying Yang National Engineering Laboratory of Biohydrometallurgy General Research Institute for Nonferrous Metals School of Metallurgy Northeastern University

Accumulation of toxic ions in leachate is one factor limiting bioleaching applications. The effect of fluoride ions on the growth of bioleaching microorganisms has been extensively emphasized. In this study, HF is found to be the toxic form of fluoride that affects the bacterial activity under acidic conditions. The added aluminum could compete with H^+ to complex with F-, thus significantly decrease the concentration of HF and finally reduce the toxicity of fluoride to bacteria. When F^-/Al^(3+)concentration ratio is 0.5:1.0, Fe^(2+) oxidation rate could reach 0.167 g·L^(-1)·h^(-1), close to that of the biotic control group(0.195 g·L^(-1)·h^(-1)). The competitive complexation mechanism of fluoride by AlF_n^(3-n) results in stability constants of AlF_n^(3-n) complex(7.00) that are larger than those of HF(3.18). The F^-/Al^(3+) concentration ratio in the medium could affect the speciation of AlF_n^(3-n) *** the decrease in F^-/Al^(3+) concentration ratio, the coordination numbers of AlF_n^(3-n) decrease. Finally, the feasibility of fluoride detoxification by aluminum ion is verified. This work has meaningful implications for fluoride-containing bacterial bioleaching systems.

关键词： Competitive complexation Detoxification Fluoride Aluminum Bioleaching

Toward an optimized strategy of using various airway mucus clearance techniques to treat critically ill COVID-19 patients

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BIOCELL 2022年第4期46卷 855-871页

作者： MINGZHI LUO KAI NI YAN SUN JIA GUO kang wen LINHONG DENG Changzhou Key Laboratory of Respiratory Medical Engineering Institute of Biomedical Engineering and Health SciencesChangzhou UniversityChangzhou213164China

Coronavirus disease 2019(COVID-19)caused by acute respiratory syndrome coronavirus 2(SARS-Cov-2)is still threatening the human life and society throughout the *** those critically ill patients,mechanical ventilation(MV)is essential to provide life support during ***,both the virus infection and MV disrupt the balance between secretion and elimination of airway mucus and lead to mucus accumulation in the *** examination verified that the lungs in patients died of COVID-19 are indeed filled with sticky mucus,suggesting a great need to improve airway mucus clearance in critically ill COVID-19 ***,it may be helpful to comprehensively review the current understanding regarding the changes of biochemical and rheological features of airway mucus associated with the disease,as well as the physiological principles and algorithm to decide airway clearance techniques suitable for the critically ill COVID-19 *** on these considerations,optimized strategies may be developed to eliminate the airway mucus accumulated in the airways of critically ill COVID-19 patients.

关键词： COVID-19 Airway mucus Rheology Mechanical force Airway clearance techniques

Effects from changes in pulp nature after ultrasonic conditioning on high-sulfur coal flotation

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Mining Science and Technology 2009年第4期19卷 498-502,507页

作者： kang wen-ze XUN Hai-xin KONG Xiao-hong LI Ming-ming Resource and Environment Department Heilongjiang Institute of Science and Technology Harbin Heilongjiang 150027 China Mineral Processing Major Laboratory for Education Department of Heilongjiang Province Harbin Heilongjiang 150027 China

A study of the effects of the pulp nature on desulphurization and de-ashing during high-sulfur coal flotation is described in this paper. Highlighted are the use of a solution oxygen gauge, a pH value gauge and a surface tension gauge to investigate changes in the pulp nature related to changes in the oxygen content, the pH value and the interfacial tension. The temperature be- fore and after ultrasonic conditioning was also investigated. The results showed that ultrasonic conditioning resulted in a decrease in the oxygen content and the interracial tension and an increase in the pH value and the temperature of the pulp. The perfect index of flotation and the perfect index of desulphurization of fine coal increased by 25.19% and 18.03%, respectively, after the pulp was ultrasonically conditioned. This study shows that ultrasonic conditioning can change the pulp nature and enhance the degree of desulphurization during high-sulfur coal flotation.

关键词： ultrasonic treatment pulp perfect index of flotation perfect index of desulphurization

Anti-fibrotic effect of rosmarinic acid on inhibition of pterygium epithelial cells

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International Journal of Ophthalmology(English edition) 2018年第2期11卷 189-195页

作者： Ya-Yu Chen Chia-Fang Tsai Ming-Chu Tsai wen-kang Chen Yu-wen Hsu Fung-Jou Lu Institute of Medicine College of MedicineChung Shan Medical UniversityTaichung City 40201TaiwanChina Department of Biotechnology TransWorld UniversityDouliu City 64063TaiwanChina Department of Applied Cosmetology Tainan Junior College of NursingTainan City 70043TaiwanChina Department of Optometry Da-Yeh UniversityChanghua 51591TaiwanChina Department of Ophthalmology Chung Shan Medical University HospitalTaichung City 40201TaiwanChina

AIM： To investigate the anti-fibrosis effect of rosmarinic acid（RA） in pterygium epithelial cells（PECs） to determine if RA is a potent agent for treating ***： The PECs（1×10-4 cells/mL） were treated with 100 μmol/L of RA for 1, 3 and 6h. After RA treatment, the cell viability was determined by staining with acridine orange/DAPI and analysis via a NucleoC ounter NC-3000. The protein expression levels of type I collagen, transforming growth factor beta-1（TGF-β1）, TGF-β type Ⅱ receptor（TGF-βRⅡ）, p-Smad1/5, p-Smad2, p-Smad3, and Smad4 of the cell lysates were measured by Western blot ***： The cell viability of PECs was significantly decreased after RA treatment（P〈0.01）. As the result, RA reduced the protein expression of typeⅠcollagen and TGF-β1 of PECs. Additionally, RA also inhibited TGF-β1/Smad signaling by decreasing the protein expressions of TGF-βRII, p-Smad1/5, p-Smad2, p-Smad3, and ***： This study demonstrate that RA could inhibit fibrosis of PECs by down-regulating type I collagen expression and TGF-β1/Smad signaling. Therefore, RA is a potent therapeutic agent for the treatment of pterygium.

关键词： fibrosis pterygium rosmarinic acid transforming growth factor beta-1 typeⅠcollagen

New insights into the extraction of invisible gold in a low-grade high-sulfur Carlin-type gold concentrate by bio-pretreatment

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International Journal of Minerals,Metallurgy and Materials 2017年第10期24卷 1104-1111页

作者： Xiao-bin Qiu Jian-kang wen Song-tao Huang Hong-ying Yang Mei-lin Liu Biao Wu National Engineering Laboratory of Biohydrometallurgy General Research Institute for Nonferrous Metals School of Metallurgy Northeastern University

To extract gold from a low-grade(13.43 g/t) and high-sulfur(39.94wt% sulfide sulfur) Carlin-type gold concentrate from the Nibao deposit, Guizhou, a bio-pretreatment followed by carbon-in-pulp(CIP) cyanide leaching process was used. Various methods were used to detect the low-grade gold in the concentrate; however, only time-of-flight secondary-ion mass spectrometry(TOF-SIMS) was successful. With bio-pretreatment, the gold recovery rate increased by approximately 70.16% compared with that obtained by direct cyanide leaching of the concentrate. Various attempts were made to increase the final gold recovery rate. However, approximately 20wt% of the gold was non-extractable. To determine the nature of this non-extractable gold, mineralogy liberation analysis(MLA), formation of secondary product during the bio-pretreatment, and the preg-robbing capacity of the carbonaceous matter in the ore were investigated. The results indicated that at least four factors affected the gold recovery rate: gold occurrence, tight junctions of gold-bearing pyrite with gangue minerals, jarosite coating of the ore, and the carbonaceous matter content.

关键词： gold ore invisible gold bio-pretreatment mineralogy liberation analysis secondary product carbonaceous matter