检索结果-南通市图书馆

Preparation of low cobalt-doped LiNiO2 materials by the spray pyrolysis method

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2023年第4期33卷 425-432页

作者： Bianzheng You Zhixing Wang Ding Wang Gui Luo duo deng Guochun Yan Huajun Guo Xinhai Li Wenjie Peng Mingxia Dong Jiexi Wang National Key Laboratory of Energy Metal Resources and New Materials Engineering Research Center of the Ministry of Education for Advanced Battery Materials Hunan Provincial Key Laboratory of Nonferrous Value-Added Metallurgy School of Metallurgy and Environment Central South University National and Local Joint Engineering Laboratory for Lithium-ion Batteries and Materials Preparation Technology Key Laboratory of Advanced Battery Materials of Yunnan Province Faculty of Metallurgical and Energy Engineering Kunming University of Science and Technology Research Institute BASF Shanshan Battery Materials Co LTD.

LiNiO2(LNO) is recognized as the most promising cathode material for next-generation lithium-ion batteries owing to its highest energy density and economic benefit in the layered oxide cathode materials ***, severe cation disordering, multiple phase transformations and poor lithium-ion diffusion kinetics,which result in rapid degradation of cycling stabilities and rate properties, hinder its further practical applications. Cobalt doping is an effective strategy to address such issues, but the influences of cobalt on LNO materials have not been figured out completely yet. Hence, a systematical investigation of cobalt doping for LiNiO2cathode materials prepared by spray pyrolysis is conducted. The addition of cobalt enhances the stabilities of layered structures and suppresses the cation disordering effectively. The multiple-phase transformations during cycling are also alleviated significantly. Furthermore, cobalt doping can decrease charge transfer resistances and improve lithium-ion diffusion kinetics, especially at high de-lithiation states. As a result, the electrochemical performances are improved comprehensively after cobalt doping. The LNO with optimal doping amount exhibits an improved capacity retention of 78.0% after 100 cycles as compared with 64.9% for pristine LNO, and an outstanding rate performance of 167.2 mA h g-1with the current density of 5 C(1 C = 200 mA g-1).

关键词： Lithium nickel oxides Spray pyrolysis Cobalt doping Phase transformations Lithium-ion diffusion kinetics

Preparation of ultrafine silver powders with controllable size and morphology

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2018年第3期28卷 524-533页

作者： Qing-hua TIAN duo deng Yu LI Xue-yi GUO School of Metallurgy and Environment Central South UniversityChangsha 410083China Cleaner Metallurgical Engineering Research Center Nonferrous Metals Industry of ChinaCentral South UniversityChangsha 410083China

The ultrafine silver powders were prepared by liquid reduction method using Arabic gum as *** effects of different dispersants,pH values,and temperature on the morphology and particle size of silver powders were *** is found that Arabic gum can better adsorb on silver particles via chemical adsorption,and it shows the best dispersive effect among all the selected *** particle size of silver powders can be finely tuned from 0.34 to 4.09μm by adjusting pH values,while the morphology of silver powders can be tuned by changing the *** silver powders with high tap density higher than 4.0 g/cm3 were successfully prepared in a wide temperature range of 21.8-70°***,the tap density is higher than 5.0 g/cm3 when the temperature is optimized to be 50°*** facile process and high silver concentration of this method make it a promising way to prepare high quality silver powders for electronic paste.

关键词： ultrafine silver powder Arabic gum dispersion mechanism tap density controllable preparation

GPa-level pressure-induced enhanced corrosion resistance in TiZrTaNbSn biomedical high-entropy alloy

在线全文

学校读者我要写书评

暂无评论

China Foundry 2024年第3期21卷 265-275页

作者： Xiao-hong Wang Yu-lei deng Qiao-yu Li Zhi-xin Xu Teng-fei Ma Xing Yang duo Dong Dong-dong Zhu Xiao-hong Yang Key Laboratory of Air-driven Equipment Technology of Zhejiang Province Quzhou UniversityQuzhou 324000ZhejiangChina School of Materials Science and Engineering Taizhou UniversityTaizhou 318000ZhejiangChina

TiZrTaNb-based high-entropy alloys(HEAs)are research frontier of biomedical materials due to their high hardness,good yield strength,excellent wear resistance and corrosion ***,as an essential trace element in the human body that plays a significant role in physiological *** has stable chemical properties and a low elastic *** this study,a new material,TiZrTaNbSn HEAs,was proposed as a potential biomedical *** Ti_(35)Zr_(25)Ta_(15)Nb_(15)Sn_(10)biomedical high-entropy alloys(BHEAs)were successfully prepared through an arc melting furnace and then remelted using a German high-temperature and high-pressure apparatus under GPa-level(4 GPa and 7 GPa).The precipitation behavior of the needle-like HCP-Zr_(5)Sn_(3)phase that precipitates discontinuously at the grain boundary was successfully *** phase constitution,microstructure,and corrosion resistance of the alloy were *** results show that the needle-like HCP-Zr_(5)Sn_(3)phase is eliminated and the(Zr,Sn)-rich nano-precipitated phase is precipitated in the microstructure under high pressure,which leads to the narrowing of grain boundaries and consequently improves the corrosion resistance of the *** addition,the formation mechanisms of(Zr,Sn)-rich nanoprecipitates in BHEAs were *** Zr and Sn dissolve in the matrix due to the effect of high pressure,during the cooling process,they precipitate to form a(Zr,Sn)-rich nano-precipitated phase.

关键词： biomedical HEAs precipitation grain boundary corrosion resistance TiZrTaNbSn

在线全文

学校读者我要写书评

暂无评论

虐待儿童行为刑法规制的立法中心主义反思

河南大学学报（社会科学版） 2014年第1期54卷 76-84页

作者：邓多文重庆大学法学院重庆400030

近年来,全国各地不断发生的虐待儿童案件引发社会各界的高度关注,是否增设"虐待儿童罪"成为备受争议的焦点问题。争议的实质在于,刑法如何规制虐待儿童行为,从而实现具体虐待儿童行为与抽象刑法规则的对接。动辄"嘲笑"刑法、修改刑法的... 详细信息

近年来,全国各地不断发生的虐待儿童案件引发社会各界的高度关注,是否增设"虐待儿童罪"成为备受争议的焦点问题。争议的实质在于,刑法如何规制虐待儿童行为,从而实现具体虐待儿童行为与抽象刑法规则的对接。动辄"嘲笑"刑法、修改刑法的刑事立法中心主义模式,须向尊重刑法、合理释法的刑事司法中心主义模式转换。

关键词：虐待儿童行为刑法规制模式刑事立法中心主义刑法司法中心主义

Hydromassage of macular hole edges for large and persistent full-thickness macular holes

在线全文

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2024年第3期17卷 551-557页

作者： Yi Cai Wen-Bo Liu duo Wei Xun deng Xiao-Xin Li Ming-Wei Zhao Xuan Shi Jian-Hong Liang Department of Ophthalmology Peking University People’s HospitalBeijing 100044China Eye Diseases and Optometry Institute Beijing 100044China Beijing Key Laboratory of Diagnosis and Therapy of Retinal and Choroid Diseases Beijing 100044China College of Optometry Peking University Health Science CenterBeijing 100044China Xiamen Eye Center of Xiamen University Xiamen 361102Fujian ProvinceChina Department of Ophthalmology the Second Hospital of Lanzhou UniversityLanzhou 730030Gansu ProvinceChina

●AIM:To introduce the macular hole(MH)hydromassage technique as a potentially beneficial approach for the treatment of large or persistent MH.●METHODS:This retrospective observational case series comprised 16 consecutive patients(17 eyes)diagnosed with *** criteria involved a hole aperture diameter larger than 600μm or the presence of an unclosed MH larger than 600μm following the previous *** MH repair procedures were administered in all cases,involving the manipulation and aspiration of the hole margin through the application of water flow with a soft-tip flute needle.A comprehensive assessment was conducted for each case before and after surgery,and optical coherence tomography(OCT)images were captured at every follow-up point.●RESULTS:The mean preoperative aperture diameter was 747±156μm(range 611-1180μm),with a mean base diameter of 1390±435μm(range 578-2220μm).Following surgery,all cases achieved complete anatomical closure of MH,with 13 cases(76.5%)exhibiting type 1 closure and 4 cases(23.5%)demonstrating type 2 *** significant differences were observed in the preoperative OCT variables between the two closure *** with type 1 closure showed a significantly improved visual acuity(0.70±0.10,range 0.50-0.80)compared to those with type 2 closure(0.90±0.12,range 0.80-1.00,P=0.014).●CONCLUSION:The MH hydromassage technique demonstrates promising results,achieving acceptable closure rates in cases of large or persistent *** technique may serve as an effective adjunctive maneuver during challenging MH surgery.

关键词： macular hole large macular hole persistent macular hole optical coherence tomography surgical technique hydromassage

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

阿拉伯树胶作分散剂制备超细球形银粉

稀有金属 2015年第9期39卷 818-825页

作者：田庆华李宇邓多郭学益中南大学冶金与环境学院湖南长沙410083 中国有色金属工业清洁冶金工程研究中心湖南长沙410083

以硝酸银为原料,氨水为络合剂,抗坏血酸为还原剂,采用液相还原法及连续加料方式制备了球形超细银粉。采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、紫外-可见光谱仪(UV-Vis)等对银粉进行表征,考察了分散剂种类、抗坏血酸溶液初始p H值... 详细信息

以硝酸银为原料,氨水为络合剂,抗坏血酸为还原剂,采用液相还原法及连续加料方式制备了球形超细银粉。采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、紫外-可见光谱仪(UV-Vis)等对银粉进行表征,考察了分散剂种类、抗坏血酸溶液初始p H值、温度以及加料速度对于银粉形貌、粒径、分散性和振实密度的影响,并讨论了阿拉伯树胶的分散机制。结果表明:阿拉伯树胶相比于其他分散剂具有更优的分散性能;抗坏血酸溶液初始p H值对银粉的粒径及其分布有较大的影响,p H≤4.0时,银粉粒径为0.6μm左右且粒径分布较窄,p H>4.0时,银粉粒径为0.7μm左右且粒径分布较宽;加料速度对银粉粒径和振实密度影响较大,随着加料速度的增加,银粉粒径减小,振实密度先增大后减小;在抗坏血酸溶液初始p H值为2.45,反应温度30℃,加料速度133.3 ml·min-1的条件下,制备出了分散性好,平均粒径为0.73μm,振实密度为4.3 g·cm-3的球形超细银粉。

关键词：超细银粉液相还原阿拉伯树胶振实密度

在线全文

学校读者我要写书评

暂无评论

液相还原法制备微米级球形银粉及其分散机理

中国有色金属学报 2015年第9期25卷 2484-2491页

作者：郭学益邓多李宇田庆华中南大学冶金与环境学院长沙410083 中南大学中国有色金属工业清洁冶金工程研究中心长沙410083

采用液相还原法,以硝酸银为原料、抗坏血酸为还原剂制备银粉。系统探索加料方式、分散剂、反应温度、分散剂用量和Ag NO3溶液浓度等工艺参数对银粉形貌、粒径的影响,并对分散机理进行研究。结果表明：聚乙烯吡咯烷酮（PVP）与Ag＋和银... 详细信息

采用液相还原法,以硝酸银为原料、抗坏血酸为还原剂制备银粉。系统探索加料方式、分散剂、反应温度、分散剂用量和Ag NO3溶液浓度等工艺参数对银粉形貌、粒径的影响,并对分散机理进行研究。结果表明：聚乙烯吡咯烷酮（PVP）与Ag＋和银粉的相互作用有利于银粉形貌和分散性的提高。采用正向快速加料法,在PVP用量为硝酸银的5%～20%（质量分数）,硝酸银溶液浓度为0.1～0.3 mol/L的条件下,可制备出分散性较好、表面光滑的球形银粉,其振实密度可达4.9 g/cm3;通过调节分散剂的用量,能够实现银粉平均粒径在1.02～2.72μm之间的可控制备。

关键词：微米级银粉分散机理聚乙烯吡咯烷酮(PVP)可控制备

在线全文

学校读者我要写书评

暂无评论

定罪过程的深化:从“三段论”到“循环论”

社会科学家 2008年第9期23卷 70-73页

作者：邓多文重庆文理学院重庆400031

形式理性哲学观下的定罪三段论,并不符合实际的定罪思维过程,即先前理解引导下的在刑法规范与犯罪事实之间循环,这就是诠释学所主张的循环论。形式理性三段论只是诠释学循环论的必然结果,故循环论扬弃和深化了三段论。三段论运用的是演... 详细信息

形式理性哲学观下的定罪三段论,并不符合实际的定罪思维过程,即先前理解引导下的在刑法规范与犯罪事实之间循环,这就是诠释学所主张的循环论。形式理性三段论只是诠释学循环论的必然结果,故循环论扬弃和深化了三段论。三段论运用的是演绎推理,而循环论中的类推综合了设证、归纳和演绎逻辑,可见在方法论上,循环论同样深化和拓展了三段论。

关键词：定罪三段论循环论形式理性诠释学演绎类推

在线全文

学校读者我要写书评

暂无评论

银氨体系双氧水还原法制备超细银粉

粉末冶金材料科学与工程 2015年第6期20卷 928-936页

作者：郭学益邓多李宇田庆华中南大学冶金与环境学院长沙410083 中国有色金属工业清洁冶金工程研究中心长沙410083

硝酸银溶液中加入浓氨水配制成一定pH的银氨溶液,加入双氧水作还原剂制备超细银粉,对加料方式、银氨溶液pH值、AgNO3溶液浓度、双氧水浓度等参数以及分散剂对银粉的影响进行研究。结果表明,采用正向快速加料法可制备出分散性好的银粉;... 详细信息

硝酸银溶液中加入浓氨水配制成一定pH的银氨溶液,加入双氧水作还原剂制备超细银粉,对加料方式、银氨溶液pH值、AgNO3溶液浓度、双氧水浓度等参数以及分散剂对银粉的影响进行研究。结果表明,采用正向快速加料法可制备出分散性好的银粉;调节银氨溶液pH值可改变银颗粒的Zeta电位,进而改变银粉的分散性;银粉粒径随双氧水浓度提高先增大后减小,随AgNO3溶液浓度提高而增大;分散剂对银粉形貌有较大影响。在硝酸银溶液浓度为0.1~0.3mol/L,银氨溶液pH值为10.0~11.0,双氧水浓度（质量分数）为3%的条件下,不使用任何分散剂可制备出分散性较好、平均粒径1.9~2.3μm的类球形银粉。

关键词：超细银粉双氧水分散剂 Zeta电位气泡分散机理