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The Abrasive Wear of Non-Oxide Structural Ceramics in Wet Environment

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Journal of Materials Science and Chemical Engineering 2014年第10期2卷 9-15页

作者： Z.Pedzich G.Grabowski I.Saferna M.Ziabka A.Gubernat J.Szczerba M.M.Bucko M.Kot Department of Ceramics and refractory Materials AGH-University of Science and Technology Krakow Poland Department of Machine Design and Technology AGH-University of Science and Technology Krakow Poland

Silicon carbide and silicon nitride are recognized as phases with very good mechanical properties. Many parts of machines and mechanical devices are made of these materials. Particulate composites basing on both mentioned phases have significant potential of properties improvement. The aim of presented work was to check the difference in wear behavior when materials surfaces were attacked by hard, loose particles in wet environment (pulp). Investigations were performed on silicon carbide, silicon nitride and two composites on their matrices. The basic performed test was the Miller Test according to ASTM Standard. The detail microstructural and mechanical characterization of investigated materials was done. Residual stress state caused by coefficients of thermal expansion mismatch was calculated using FEM approach. The second phases for composites were selected to introduce the compressive stress state into the matrix phase. Comparative studies of abrasive wear of “pure” phases and composites performed showed differences between dominating wear mechanisms. Tests results proved that the influence of the second phase presence in the materials was significant for the wear rate.

关键词： Abrasive Wear Miller Test Silicon Carbide Silicon Nitride Residual Stress

Silicon-Basing Ceramizable Composites Containing Long Fibers

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Journal of Materials Science and Chemical Engineering 2013年第5期1卷 43-48页

作者： Zbigniew Pedzich Rafal Anyszka Dariusz MBieliński Magdalena Ziabka Radoslaw Lach Magdalena Zarzecka-Napierala Department of Ceramics and refractory Materials AGH-University of Science&TechnologyKrakowPoland Institute of Polymer and Dye Technology Lodz University of TechnologyLodzPoland

Ceramization is a phenomenon which assures compactness of polymer-based composites in the case of their thermal degradation caused by open fire or exposure at high temperatures. This phenomenon is based on preventing volatiles of thermal decomposition of silicone rubber from evacuation by creation of ceramic layer. This ceramized structure is composed of mineral filer particles, connected by fluxing agent—glassy phase. The ceramic barrier created during firing is aimed to protect copper wire inside the cable from melting, being additionally strong enough to maintain integrity of electrical circuit. The paper presents experimental data on mechanical properties of silicone rubber composites strengthened additionally with long fibers of different types—aluminosilicate and polyamide (Kevlar) ones. Fibers were introduced into composites in oriented way. Mechanical properties were investigated taking into account fiber orientation anisotropy. Ceramization process of composites was described by observation of morphology and strengthen measurements of samples fired at 1000°C.

关键词： Silicone Rubber Ceramization Composites Polyamide Fibers Aluminosilicate Fibers

Regulatory T Cells: A New Target of Chinese Medicine in Treatment of Atherosclerosis

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Chinese Journal of Integrative Medicine 2021年第11期27卷 867-873页

作者： LIANG Zhao-ying QIAN Cai-wen LAN Tao-hua ZENG Qiao-huang LU Wei-hui JIANG Wei State Key Laboratory of Dampness Syndrome of Chinese Medicine Department of Cardiologythe Second Affiliated Hospital of Guangzhou University of Chinese MedicineGuangzhou510020China Guangdong Provincial Key Laboratory of Chinese Medicine for Prevention and Treatment of refractory Chronic Diseases Guangzhou510020China The Second Clinical Medical College of Guangzhou University of Chinese Medicine Guangzhou510405China The Second Affiliated Hospital of Guangzhou University of Chinese Medicine Guangzhou510020China

Inflammation and immune disorders are integral to the occurrence and progression of atherosclerosis(AS).With the role of regulatory T cells(Tregs)in immune regulation attracting attention,it has been widely accepted that Treg decrease and dysfunction are involved in AS *** medicine(CM)has the advantages of being dual-directional,multi-targeted,and having minimal side effects in immune *** anti-atherosclerosis effects of CM via Treg modulation have been revealed in clinical and animal ***,this article reviews existing research on Tregs,the relationship between Tregs and AS,and the progress of CM for treating and prevention of atherosclerotic cardio-cerebrovascular diseases by regulating *** the underlying mechanisms remain to be elucidated,CM treatment targeting Treg cells might provide a promising and novel future approach for prevention and treatment of AS.

关键词： Chinese medicine atherosclerosis regulatory T cells immunization inflammation

Detection rate of clinically insignificant prostate cancer ncreases with repeat prostate biopsies

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Asian Journal of Andrology 2013年第2期15卷 236-240,I0007页

作者： Bumsoo Park Seong-Soo Jeon Sung-Ho Ju Byong-Chang Jeong Seong-II Seo Hyun-Moo Lee Han-Yong Choi Department of Urology Sungkyunkwan University School of Medicine Seoul 135-710 Korea institute for refractory Cancer Research Samsung Medical Center Sungkyunkwan University School of Medicine Seou1135-710 Korea Department of Urology Kangnam General Hospital Yongin 446-597 Korea

To analyze if clinically insignificant prostate cancer （CIPC） is more frequently detected with repeat prostate biopsies, we retrospectively analyzed the records of 2146 men diagnosed with prostate cancer after one or more prostate biopsies. The patients were divided into five groups according to the number of prostate biopsies obtained, e.g, group I had one biopsy, group 2 had two biopsies and group 3 had three biopsies. Of the 2146 patients diagnosed with prostate cancer, 1956 （91,1%）, 142 （6.6%）, 38 （1.8%）, 9 （0.4%） and 1 （0.1%） men were in groups 1, 2, 3, 4 and 5, respectively. Groups 4 and 5 were excluded because of the small sample sizes. The remaining three groups （groups 1, 2 and 3） were statistically analyzed. There were no differences in age or prostate-specific antigen level among the three groups. CIPC was detected in 201 （10.3%）, 28 （19.7%） and 9 （23.7%） patients in groups 1, 2 and 3, respectively （P〈O.O01）. A multivariate analysis showed that the number of biopsies was an independent predictor to detect ClPC （0R=2.688 for group 2; 0R=4.723 for group 3）. In conclusion, patients undergoing multiple prostate biopsies are more likely to be diagnosed with CIPC than those who only undergo one biopsy. However, the risk still exists that the patient could have clinically significant prostate cancer. Therefore, when counseling patients with regard to serial repeat biopsies, the possibility of prostate cancer overdiagnosis and overtreatment must be balanced with the continued risk of clinically significant disease.

关键词： clinically insignificant prostate cancer (CIPC) clinically significant prostate cancer (CSPC) biopsy early detection ofcancer prostatic neoplasms

含钒石煤脱碳焙烧过程温度变化规律及焙烧条件影响

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Journal of Central South University 2023年第6期30卷 1817-1830页

作者：白哲韩跃新孙永升靳建平周振亚唐志东 School of Resources and Civil Engineering Northeastern UniversityShenyang 110000China State Key Laboratory of Mineral Processing Beijing 102628China National-local Joint Engineering Research Center of High-efficient Exploitation Technology for refractory Iron Ore Resources Shenyang 110000China

含钒石煤是我国储量巨大的一种钒矿资源。对于含碳量高的石煤原矿,脱碳焙烧工艺能在提高钒浸出率的同时降低酸耗。对石煤脱碳焙烧过程的温度变化进行研究,避免高温烧结的同时还可利用其自身热量,这对提高焙烧过程热利用效率具有重要意... 详细信息

含钒石煤是我国储量巨大的一种钒矿资源。对于含碳量高的石煤原矿,脱碳焙烧工艺能在提高钒浸出率的同时降低酸耗。对石煤脱碳焙烧过程的温度变化进行研究,避免高温烧结的同时还可利用其自身热量,这对提高焙烧过程热利用效率具有重要意义。本文在650℃、50 min、空气流量500 mL/min及20%O_(2)浓度的最佳焙烧条件下,对石煤悬浮焙烧的全过程进行系统分析和研究。在最初3.9 min内,样品迅速由室温升温至560.1℃;持续加热至10.3 min,白云石和高岭石分解,样品温度升至最高值741.5℃;燃烧结束后,样品温度回落,并稳定在622.5℃。这表明脱碳主要发生在最初的30 min内,石煤中碳质燃烧可将物料自身温度提高约120℃。基于此得到了含钒石煤脱碳焙烧过程的温度变化规律。因此,在石煤脱碳焙烧中应利用其温度变化规律,在避免高温和高氧引起的局部烧结的同时,利用自身燃烧热量,以提高焙烧效率和热利用率。

关键词：温度变化脱碳焙烧含钒石煤悬浮焙烧

Fabrication and Improving Properties of Lightweight Al_(2)O_(3)-MgO Castables for L adle Working Lining

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China's Refractories 2023年第1期32卷 6-13页

作者： WANG Zhiqiang LEI Zhongxing XU Guotao PENG Xiaoqian ZHU Boquan LIU Li GUO Zongqi Wugang refractory Co. Ltd.Wuhan 430080China R&D Center of Wuhan Iron and Steel Co. Ltd.Baosteel Central Research InstituteWuhan 430080China Wuhan University of Science and Technology Wuhan 430081China Xi’an University of Architecture and Technology Xi’an 710055ChinaAbstract

Three lightweight Al_(2)O_(3)-MgO castables were fabricated with tabular alumina or microporous corundum as the aggregates,reactiveα-Al_(2)O_(3)micropowder,tabular alumina powder,and fused magnesia powder as the matrix,calcium aluminate cement as the binder,and MgO ultrafine powder(d50=5.4μm)and Al(OH)3 ultrafine powder(d50=8.2μm)as *** influence of aggregates and ultrafine powders on the properties,including pore size distribution,heat conductivity,thermal shock resistance,and slag resistance of lightweight refractory castables was *** results show that the incorporation of microporous corundum reduces the bulk density of Al_(2)O_(3)-MgO castables,and MgO and Al(OH)3 ultrafine powders further increases the proportion of micropores in castables,which is beneficial to reducing the heat conductivity,and improving the thermal shock resistance and slag resistance of ***,MgO ultrafine powder and Al(OH)3 ultrafine powder increase the fluidity and the strength of castables.

关键词： lightweight alumina-magnesia castables microporous corundum ultrafine powder1

Fast-ionic conductor Li_(2.64)(Sc_(0.9)Ti_(0.1))_(2)(PO_(4))_(3) doped PVDF-HFP hybrid gel-electrolyte for lithium ion batteries

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Journal of Central South University 2022年第9期29卷 2980-2990页

作者： WANG Zhen-yu LI Cong HUANG Ying-de HE Zhen-jiang YAN Cheng MAO Jing DAI Ke-hua ZHENG Jun-chao School of Metallurgy and Environment Central South UniversityChangsha 410083China National Engineering Laboratory for High Efficiency Recovery of refractory Nonferrous Metals Central South UniversityChangsha 410083China Engineering Research Center of the Ministry of Education for Advanced Battery Materials Central South UniversityChangsha 410083China School of Mechanical Medical and Process EngineeringQueensland University of TechnologyBrisbaneQueensland 4001Australia School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China College of Chemistry Tianjin Normal UniversityTianjin 300387China

With increasing demand on energy density of lithium-ion battery,wide electrochemical window and safety performance are the crucial request for next generation ***-electrolyte as a pioneer for electrolyte solidization development aims to solve the safety and electrochemical window ***,low ionic conductivity and poor physical performance prohibit its further ***,a fast-ionic conductor(Li_(2.64)(Sc_(0.9)Ti_(0.1))_(2)(PO_(4))_(3))(LSTP)was added into poly(vinylidene fluoride-co-hexafluoropropylene)(PVDF-HFP)base gel-electrolyte to enhance mechanical properties and ionic *** reveal that LSTP was able to weaken interforce between polymer chains,which increased the ionic conductibility and decreased interface resistance during the cycling *** obtained LiFePO_(4)/hybrid gel-electrolyte/Li-metal coin cell exhibited excellent rate capacity(145 mA·h/g at 1C,95 mA·h/g at 3C,28℃)which presented a potential that can be comparable with commercialized liquid electrolyte system.

关键词： lithium ion battery hybrid gel-electrolyte fast-ionic conductor inorganic filler electrochemical performance

A carbon-rich g-C_(3)N_(4) with promoted charge separation for highly efficient photocatalytic degradation of amoxicillin

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Chinese Chemical Letters 2021年第9期32卷 2787-2791页

作者： Dan Huang Xianbo Sun Yongdi Liu Haodong Ji Wen Liu Chong-Chen Wang Weiyu Ma Zhengqing Cai National Engineering Laboratory for High-concentration refractory Organic Wastewater Treatment Technologies East China University of Science and TechnologyShanghai 200237China The Key Laboratory of Water and Sediment Sciences Ministry of EducationCollege of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation School of Environment and Energy EngineeringBeijing University of Civil Engineering and ArchitectureBeijing 100044China

A novel carbon-rich g-C_(3)N_(4) nanosheets with large surface area was prepared by facile thermal polymerization method using urea and 1,3,*** of carbon-rich functional groups were introduced into the surface layers of g-C_(3)N_(4),which constructed the built-in electric field(BIEF)and resulted in improved charge separation;therefore,the carbon-rich g-C_(3)N_(4) displayed superior photocatalytic activity for amoxicillin degradation under solar *** contaminant degradation mechanism was proposed based on radical quenching experiments,intermediates analysis and density functional theory(DFT)***,the reusing experiments showed the high stability of the material,and the amoxicillin degradation under various water matrix parameters indicated its high applicability on pollutants treatment,all of which demonstrated its high engineering application potentials.

关键词： Carbon-rich g-C_(3)N_(4) Photocatalysis Built-in electron field Charge separation

Development of Andalusite Bricks for Hot Blast Stove

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China's Refractories 2008年第2期17卷 25-28页

作者： KANG Huarong LI Xianming DONG Shengying XUE Wendong LI Yong SONG Wen Gongyi Tongda refractory Technology Co. Ltd. Gongyi 451261 China School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

Low-creep andalusite bricks are characterized by high refractoriness under load, good anti-creep property, high mechanical strength, low porosity, good thermal shock resistance, etc. In this study, low-creep andalusite brick specimens were investigated in the lab using mullite, bauxite and andalusite. Andalusite with the different particle sizes were used in the experiment and the specimen with the best property was selected us the production standard. In addition, the industrial produced low-creep andalusite bricks were compared with other low-creep bricks. The results show that the developed low-creep andalusite bricks is an excellent material for hot blast stove.

关键词： Andalusite Low-creep bricks Hot blast stove