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Cutting performance of saw blades with microtextured rougher and finisher sawteeth

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Advances in Manufacturing 2024年第2期12卷 317-334页

作者： Yang Lu Jian-Xin deng Zhi-Hui Zhang Jia-Xing Wu Ran Wang yi-Chen Bao Key Laboratory of High Efficiency and Clean Mechanical Manufacture of MOE School of Mechanical EngineeringShandong UniversityJinan250061People’s Republic of China

The problems of severe sawtooth wear,harsh sawing noise,and low surface quality during the processing of circular saw blades need to be *** improve the cutting performance of TiC-based cermet saw blades,microtextures parallel to the cutting edge were fabricated on rough and fine sawteeth by laser *** cutting tests were performed on a sawing platform under lubricated *** of the sawing arc length and working sawtooth cutting force variations were developed for sawing steel pipes,and the accuracy of the sawing force model was verified *** results indicate that the variations in the sawing force are proportional to the sawing arc *** circular saw blades with microtextures that did not penetrate the sawtooth rake face exhibited the lowest cutting force,sawing noise,and highest machined surface ***,the worn-out distance of the rougher and finisher sawteeth was reduced by approximately 7.4%and 44.1%,respectively,compared with conventional circular saw *** main failure modes of sawteeth were tip wear,rake face adhesion,and oxidative *** addition,the mechanism by which the textures improve the cutting and wear properties of TiC-based circular saw blades was *** study provided a significant concept for enhancing the cutting performance of circular saw blades and improving the machined surface quality.

关键词： Circular saw blades Micro textures Cutting performance Wear performance

Construction of ZnO@CDs@Co_(3)O_(4) sandwich heterostructure with multi-interfacial electron-transfer toward enhanced photocatalytic CO_(2) reduction

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Chinese Chemical Letters 2024年第4期35卷 147-152页

作者： Xiuzheng deng yi Ke Jiawen Ding yingtang Zhou Hui Huang Qian Liang Zhenhui Kang Advanced Catalysis and Green Manufacturing Collaborative Innovation Center CNPC-CZU Innovation AllianceSchool of Petrochemical EngineeringChangzhou UniversityChangzhou 213164China Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215123China Zhejiang Key Laboratory of Petrochemical Environmental Pollution Control National Engineering Research Center for Marine AquacultureMarine Science and Technology CollegeZhejiang Ocean UniversityZhoushan 316004China

Photocatalytic conversion of CO_(2) into small-molecule chemical feedstocks can meet the growing demand for energy and alleviate the global warming. Herein, a p-n ZnO@CDs@Co_(3)O_(4) heterojunction with sandwich structure was constructed by calcination method of self-assembled ZIF-8@CDs@ZIF-67. The ZnO@CDs@Co_(3)O_(4) with well-defined interfacial structure exhibited the significantly enhanced photocatalytic CO_(2) reduction activity, and the optimal catalyst indicated the(CO + CH_(4)) evolution rate of 214.53μmol g^(-1)h^(-1) under simulated solar light, which was superior to ZnO, Co_(3)O_(4) and binary ZnO@Co_(3)O_(4).The internal cavity, exposed active sites, multiple interfaces and constructed p-n heterojunction can facilitate the light harvesting and photoexcited electron transfer. Besides, after introduction of CDs placed in the middle layer between ZnO and Co_(3)O_(4), CDs with excellent photoelectric property further promoted charge separation and migration. This work represents an appealing strategy to construct well-defined photocatalysts for boosting CO_(2) photoreduction.

关键词： Metal-organic framework Photocatalytic CO_(2) reduction Carbon dots p-n heterojunction Sandwich heterostructure

Organ fibrosis inhibited by blocking transforming growth factor-β signaling via peroxisome proliferator-activated receptor γ agonists

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Hepatobiliary & Pancreatic Diseases International 2012年第5期11卷 467-478页

作者： yi-Lei deng, Xian-Ze Xiong, Nan-Sheng Cheng Department of General Surgery, West China Hospital,Sichuan University, Chengdu 610041, China Department of General Surgery West China Hospital Sichuan University Chengdu 610041 Chengdu China

BACKGROUND:Organ fibrosis has been viewed as one of the major medical problems, which can lead to progressive dysfunction of the liver, lung, kidney, skin, heart, and eventually death of patients. Fibrosis is initiated by a variety of pathological, physiological, biochemical, and physical factors. Regardless of their different etiologies, they all share a common pathogenetic process: excessive activation of the key profibrotic cytokine, transforming growth factor-β (TGF-β). Peroxisome proliferator-activated receptor γ (PPARγ), a ligand-activated transcription factor of the nuclear receptor superfamily, has received particular attention in recent years, because the activation of PPARγ by both natural and synthetic agonists could effectively inhibit TGF-β-induced profibrotic effects in many organs. DATA SOURCES: The English-language medical databases, PubMed, Elsevier and SpringerLink were searched for articles on PPARγ, TGF-β, and fibrosis, and related topics. RESULTS: TGF-β is recognized as a key profibrotic cytokine. Excessive activation of TGF-β increases synthesis of extracellular matrix proteins and decreases their degradation, associated with a gradual destruction of normal tissue architecture and function, whereas PPARγ agonists inhibit TGF-β signal transduction and are effective antifibrogenic agents in many organs including the liver, lung, kidney, skin and heart. CONCLUSIONS: The main antifibrotic activity of PPARγ agonists is to suppress the TGF-β signaling pathway by so-called PPARγ-dependent effect. In addition, PPARγ agonists, especially 15d-PGJ2, also exert potentially antifibrotic activity independent of PPARγ activation. TGF-β1/Smads signaling not only plays many essential roles in multiple developmental processes, butalso forms cross-talk networks with other signal pathways, and their inhibition by PPARγ agonists certainly affects the cytokine networks and causes non-suspected side-effects. Anti-TGF-β therapies with PPARγ agonists may have to be car

关键词： PPAR gamma transforming growth factor-β fibrosis

3D porous PTFE membrane filled with PEO-based electrolyte for all solid-state lithium-sulfur batteries

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Rare Metals 2022年第8期41卷 2834-2843页

作者： Zhen-Chao Li Teng-Yu Li yi-Rui deng Wen-Hao Tang Xiao-Dong Wang Jin-Lin Yang Qiang Liu Lei Zhang Qiang Wang Rui-Ping Liu Department of Materials Science and Engineering China University of Mining&Technology(Beijing)Beijing100083China School of Materials Science and Engineering Tsinghua UniversityBeijing100083China Department of Mechanical Engineering University of Alaska FairbanksPO Box 755905FairbanksAK99775USA Chongqing Key Laboratory of Green Aviation Energy and Power Chongqing Jiaotong UniversityChongqing401135China

Owing to the low cost and high theoretical energy density,lithium-sulfur battery has become one of the most promising energy storage battery ***,the inherent cycle instability and safety problems of traditional liquid lithium-sulfur batteries greatly limit their commercial *** this work,polytetrafluoroethylene(PTFE)membrane was introduced into Li_(7)La_(3)Zr_(2)O_(12)(LLZO)@poly(ethylene oxide)(PEO)-based composite electrolyte as a supporting framework to prepare a new PTFE@LLZO@PEO composite electrolyte for lithium-sulfur *** introduction of PTFE membrane further improved the mechanical properties and thermal stability of the *** ionic conductivity of the prepared PTFE@LLZO@PEO solid electrolyte was5.03×10^(-5)S·cm^(-1)at 30℃and 2.54×10^(-4)S·cm^(-1)at60℃.Moreover,the symmetric battery exhibited high cycle stability(300 h).The Li-S battery based on PTFE@LLZO@PEO electrolyte exhibited excellent electrochemical performance.

关键词： Lithium-sulfur battery All solid-state battery Composite electrolyte Shuttle effect Lithium dendrite

Regulating electrochemical performances of lithium battery by external physical field

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Rare Metals 2024年第6期43卷 2391-2417页

作者： Shi-Kang Wang Shuai Wu yi-Cheng Song Hassanien Gomaa Cui-Hua An Qi-Bo deng Ning Hu School of Mechanical Engineering School of Materials Science and EngineeringHebei University of TechnologyTianjin 300401China Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai 200444China Department of Chemistry Faculty of ScienceAl-Azhar UniversityAssiut 71524Egypt Tianjin Key Laboratory of Power Transmission and Safety Technology for New Energy Vehicles Tianjin 300401China State Key Laboratory of Reliability and Intelligence Electrical Equipment Key Laboratory of Advanced Intelligent Protective Equipment TechnologyMinistry of EducationHebei University of TechnologyTianjin 300130China

Lithium batteries have always played a key role in the field of new energy ***,non-controllable lithium dendrites and volume dilatation of metallic lithium in batteries with lithium metal as anodes have limited their ***,a large number of studies have shown that the electrochemical performances of lithium batteries can be enhanced through the regulation of external physical ***,it significantly hinders the growth of lithium dendrites and promoting the reaction *** review summarizes recent innovations in the investigation of various physical fields of lithium *** application of magnetic field in the synthesis of lithium battery electrode materials is *** influence factors and regulation mechanism of various physical fields on the electrochemical performance of lithium batteries are reviewed *** addition,the current research status and existing challenges,along with future directions for the evolution of lithium batteries,are minutely discussed and *** strategies for the further evolution of lithium batteries have also been provided.

关键词： Lithium battery External field assist Reaction kinetics Lithium dendrite

云南大型科研仪器开放共享服务绩效评价系统的构建

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西南林业大学学报（社会科学） 2024年第4期8卷 110-116页

作者：邓艺张汝斌赵平伟冯嘉诚谭鹏吴斌卢云涛云南省科学技术情报研究院云南昆明650051 云南省科学技术院云南昆明650228 云南大学审计处云南昆明650000

为提高绩效评价的准确性,提升管理单位开放共享服务效率。依据云南大型科研仪器开放共享服务平台、运用管理模型与综合优化计算法相结合,对云南大型科研仪器开放共享服务绩效评价系统构建进行探析。结果表明:系统评价指标公开透明,评价... 详细信息

为提高绩效评价的准确性,提升管理单位开放共享服务效率。依据云南大型科研仪器开放共享服务平台、运用管理模型与综合优化计算法相结合,对云南大型科研仪器开放共享服务绩效评价系统构建进行探析。结果表明:系统评价指标公开透明,评价结果无人为因素干扰;系统构架和功能设计操作简易方便,适用性较强;系统测评误差低、测评效率高,绩效评价的准确性与效率得以提高。

关键词：科研仪器开放共享绩效评价系统设计

Bcl-xl阻断肿瘤坏死因子α诱导的caspase 8活化及细胞凋亡

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中华肝脏病杂志 2005年第4期13卷 286-289页

作者：杨林 deng yi-bin WU Xiang-wei 510630 广州中山大学附属第三医院病毒性肝炎研究室美国贝勒医学院细胞与分子生物学系

目的探讨Bcl-xl对肿瘤坏死因子α(TNFα)介导的细胞凋亡信号通路以及细胞凋亡的影响。方法将iκBα负性突变体质粒pmiκB与绿色荧光蛋白(GFP)表达质粒pEGFP-C1,pmiκB、pBcl-xl／HA与pEGFP-C1分别共转染HeLa细胞;将pBcl-xl／HA转染核因... 详细信息

目的探讨Bcl-xl对肿瘤坏死因子α(TNFα)介导的细胞凋亡信号通路以及细胞凋亡的影响。方法将iκBα负性突变体质粒pmiκB与绿色荧光蛋白(GFP)表达质粒pEGFP-C1,pmiκB、pBcl-xl／HA与pEGFP-C1分别共转染HeLa细胞;将pBcl-xl／HA转染核因子-κB(NF-κB)／p65基因敲除的p65-／-MEF细胞,并用嘌呤霉素筛选及westernblot鉴定获得稳定表达Bol-xl的细胞系p65-／／Bcl-xlMEF。用TNFα处理HeLa／miκB、HeLa／miκB／Bcl-xl细胞以及p65-／-MEF、p65-／Bcl-xlMEF细胞,并在显微镜下观察细胞形态变化、台盼蓝染色计算死亡细胞以检测各组细胞凋亡情况;采用westernblot检测凋亡信号通路中caspase8活化及腺苷二磷酸核糖聚合酶(PARP)裂解情况。结果单独转染pmiκB的HeLa细胞,TNFα诱导的细胞凋亡明显,表现为细胞变圆、脱落、死亡,而PBcl-xl／HA与pmiκB共转染的HeLa细胞,TNFα处理后未见细胞凋亡。p65-／-MEF细胞经TNFα处理发生凋亡,该作用在TNFα处理后4h即可出现,处理12h后细胞死亡率为90％,而在表达Bol-xl的p65-／-/Bcl-xlMEF细胞,TNFα处理24h也未见细胞凋亡或死亡发生。Westernblot检测表明单独转染pmiκB的HeLa细胞,TNFα诱导了caspase8裂解活化及PARP裂解,而pBcl-xl／HA与pmiκB共转染、表达Bcl-xl的HeLa细胞。

关键词： Bcl-xl 肿瘤坏死因子α 诱导 caspase8活化细胞凋亡绿色荧光蛋白

Preparation of sodium manganate from low-grade pyrolusite by alkaline predesilication-fluidized roasting technique

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Transactions of Nonferrous Metals Society of China 2018年第5期28卷 1045-1052页

作者： Xiang-yi deng Ya-li FENG Hao-ran LI Zhu-wei DU Jin-xing KANG Cheng-lin GUO School of Civil and Resource Engineering University of Science and Technology Beijing Beijing 100083 China State Key Laboratory of Biochemical Engineering Institute of Process Engineering Chinese Academy of Science Beijing 100090 China

Low concentration alkaline leaching was used for predesilication treatment of low-grade pyrolusite. The effects of initial NaOH concentration, liquid-to-solid ratio, leaching temperature, leaching time and stirring speed on silica leaching rate were investigated and the kinetics of alkaline leaching process was studied. The results show that silica leaching rate reached 91.2% under the conditions of initial NaOH concentration of 20%, liquid-to-solid ratio of 4：1, leaching temperature of 180 ℃, leaching time of 4 h and stirring speed of 300 r/min. Shrinking-core model showed that the leaching process was controlled by the chemical surface reaction with activation energy Ea of 53.31 k J/mol. The fluidized roasting conditions for preparation of sodium manganate were optimized by the orthogonal experiments using the desiliconized residue. The conversion rate of sodium manganate was obtained to be 89.7% under the conditions of silica leaching rate of 91.2%, NaOH/MnO2 mass ratio of 3：1, roasting temperature of 500 ℃ and roasting time of 4 h, and it increased with the increase of silicon leaching rate.

关键词： low-grade pyrolusite desilication fluidized roasting sodium manganate

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一种基于密度网格索引的k-最近邻查询算法

电子学报 2017年第2期45卷 376-383页

作者：章登义李想武汉大学计算机学院湖北武汉430072

基于位置的服务的迅速发展对服务响应的效率提升和成本控制提出了更高的要求,本文提出了一种基于密度网格索引的k-最近邻查询算法,该算法首先利用矩形的几何特点获取一系列候选搜索半径,随后根据移动对象的密度分布情况选择适当的候选... 详细信息

基于位置的服务的迅速发展对服务响应的效率提升和成本控制提出了更高的要求,本文提出了一种基于密度网格索引的k-最近邻查询算法,该算法首先利用矩形的几何特点获取一系列候选搜索半径,随后根据移动对象的密度分布情况选择适当的候选搜索半径进行距离过滤,尽量减少不必要的内存索引单元和磁盘索引单元的访问.实验表明,实现了本文算法的密度网格索引在k-最近邻查询的查询效率上与ST^2B-tree不相上下,而查询的I/O代价与其他索引结构相比有明显的优势.

关键词： k-最近邻查询移动对象密度网格候选搜索半径