检索结果-南通市图书馆

Journal of Magnesium and Alloys 2023年第8期11卷 2719-2739页

作者： Hui Fang shicheng zhou Xiaoyun Qi Chenxi Wang Yanhong Tian State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

Biomimetic bone-active coatings composed of inorganic nano-hydroxyapatite(i.e.,nHA)and organic silk fibroin(i.e.,SF)are layer-by-layer deposited on Mg-Zn-Ca alloy by a controllable ultrasonic spray ***,plasma activation is developed as a promising strategy to pretreat magnesium surfaces,which facilitates the direct adhesion of coatings with enhanced bonding *** this work,we engineer the nHA/SF composite coatings with excellent mechanical properties and adhesion *** optimized parameters of ultrasonic spray bring significant influence on the surface morphologies of *** by hybrid plasma of oxygen and nitrogen(i.e.,O_(2)/N_(2) plasma),the activated Mg-Zn-Ca surfaces are uniformly covered by a robust and compact nHA/SF composite coating,establishing a multifunctional system with superior corrosion resistance and biological ***,secondary oxygen plasma treatment of nHA/SF coatings(A-nHA/SF)promotes the hydrophilicity,leading to a rapid self-repair effect from surface *** improvement of anti-corrosion and self-repair provides a dependable platform for better cell adhesion,proliferation,spreading and *** favorable factors contribute to the preferable in vivo biocompatibility and the promotion of newly formed bones for the A-nHA/SF-coated Mg *** study lays important foundations for coating strategy on biomedical magnesium alloy as multifunctional osteogenic system in bioactive implantable applications.

关键词： Magnesium alloy Hydroxyapatite Silk fibroin Biocompatibility Self-repair

Exploration of the enhanced performances for silk fibroin/sodium alginate composite coatings on biodegradable Mg-Zn-Ca alloy

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2021年第5期9卷 1594-1610页

作者： Hui Fang Chenxi Wang shicheng zhou Ge Li Yanhong Tian Tadatomo Suga State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China Collaborative Research Center Meisei UniversityHinoTokyo 191-8506Japan

To expand the future clinic applications of biodegradable magnesium alloy,polymer coatings with excellent biocompatibility are the keys to solve the local alkalinity and rapid hydrogen ***-organic silk fibroin provides an approach to fabricate a protective coating on biomedical Mg-Zn-Ca alloy,however,the adhesion force and mechanical properties of the coating on substrates are ought to be further improved without any chemical conversion/intermediate ***,based on VUV/O;surface activation,a hybrid of silk fibroin and sodium alginate is proposed to enhance the adhesion force and mechanical properties of the composite coatings on hydrophilic Mg-Zn-Ca alloy *** mass ratios of sodium alginate addition were investigated to achieve the optimum coating *** nanoscratch test and nanoindentation test confirmed that the adhesion force was tripled and mechanical properties index was significantly improved when the mass ratio of silk fibroin/sodium alginate was 70/30 compared to pure silk fibroin or sodium alginate ***,the corrosion rate of the coated Mg-Zn-Ca alloy was significantly delayed with the addition of sodium alginate,resulting in a reaction layer during corrosion ***,the mechanisms for both adhesion and corrosion processes were discussed in *** findings offer more possibilities for the controllable surface performance of degradable metals.

关键词： Mg-Zn-Ca alloy Silk fibroin Sodium alginate Adhesion force Mechanical property Corrosion resistance

One-step PDA coating strategy on pure Zn for blood-contacting engineering

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2022年第28期123卷 78-91页

作者： Xiaoyun Qi shicheng zhou Hui Fang Shuhan Yang Chunjin Hang Yanhong Tian Chenxi Wang State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

The mechanical performance degradation caused by pitting corrosion and the insufficient biocompatibility induced with ion release inhibit the application of Zn as the new biodegradable metallic materials for blood-contacting intervention *** work successfully coats a uniform polydopamine(PDA)layer on pure Zn via a one-step deposition process without introducing heavy metal elements or detrimental *** corrosion resistance and uniform corrosion have been performed on PDA coated Zn with corrosion products and pits reduced significantly than pure Zn during in vitro *** could be prohibited by anticoagulation performance with prothrombin time and activated partial thromboplastin time prolonged after co-incubation,and an almost 40%decrease of platelets adhesion,indicating the improved blood compatibility of coated ***,the poly(lactic-co-glycolic acid)(PLGA)is filmed on PDA coated Zn to realize a smooth double-coated structure with superior mechanical performance under stress loading to stably serve the multifunctional application,such as drug *** strategy not only represents a facile and biological friendly method for Zn surface modification but also puts forward new ideas on preparing PDA-based coatings on active biodegradable alloys,which are beneficial for better blood-contacting engineering.

关键词： Biodegradable Pure Zn Uniform corrosion Blood compatibility Doubled-coated structure

Recycled low-temperature direct bonding of Si/glass and glass/glass chips for detachable micro/nanofluidic devices

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2020年第11期42卷 156-167页

作者： Chenxi Wang Hui Fang shicheng zhou Xiaoyun Qi Fanfan Niu Wei Zhang Yanhong Tian Tadatomo Suga State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin J50001China School of Mechanical and Electrical Engineering Guilin University of Electronic TechnologyCuilin 541004China Collaborative Research Center Meisei UniversityTokyo 191-8506Japan Department of Precision Engineering School of EngineeringThe University of TokyoBunkyoTokyo 113-8656Japan

Silicon and glass are two of the most ideal materials for micro/nanofluidic devices,which have been widely used for research in multidisciplinary ***,many micro/nanofluidic devices enable only single use due to the irreversible bonding between Si/glass or glass/glass *** the silicon-and glass-based devices are fabricated to be detachable,the substrates can be reused and bonded again without repeating expensive micro/nanofabrication ***,we present a recycled direct bonding method for Si/glass and glass/glass chips based on oxygen plasma activation and low-temperature annealing *** bonding strength and void-free bonding interface are obtained after annealing at 150℃.The surfaces and the bonding interfaces are characterized to elucidate the bonding ***,immersion tests are carried out to investigate the interfacial corrosion resistance in various chemical and biological solutions as well as explore a detachable *** bonding strengths are controlled to meet the demand for micro/nanofluidic devices and the bonding interfaces can be separated in *** a result,we succeed in the experiment of bonding and detaching of glass substrates without fracturing,which is repeated for three times.

关键词： Low-temperature bonding Plasma activation Interface Corrosion Detachable

Fabrication of Ag@Ag_(2)O-MnO_(x) composite nanowires for high-efficient room-temperature removal of formaldehyde

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2021年第32期91卷 5-16页

作者： Hui Fang Chenxi Wang Daoyuan Li shicheng zhou Yu Du He Zhang Chunjin Hang Yanhong Tian Tadatomo Suga State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China Collaborative Research Center Meisei UniversityTokyo 191-8506Japan

Efficient removal of pollutant formaldehyde(HCHO) at room temperature using transition-metal oxides remains a huge challenge to date. Manganese oxide can oxidize formaldehyde, however, how to control the valence states of manganese is the key to further improve the removal efficiency. We have successfully prepared porous manganese oxide nanowires(Mn OxNWs) with large surface area and multiple valence states of manganese using simple electrospinning followed by thermal calcination and potassium permanganate solution post-treatment(C/S process). The contents of trivalent and tetravalent manganese increased significantly after C/S process. Moreover, the composition of silver oxide coated silver nanowires(Ag@Ag_(2) O NWs) is realized by assistance with oxygen plasma, which further enhanced high valence manganese. The formaldehyde removal efficiency by Ag@Ag_(2) O–Mn Oxcomposite nanowires can reach 93.7%. The high-efficient catalytic activity is confirmed to attribute to the higher surface area of composite nanowires, the high-valence manganese and the silver oxide for oxidation of formaldehyde.

关键词： Electrospinning O_(2)plasma Manganese oxides Silver nanowires Formaldehyde

Theory and Method of Mineral Resource Prediction Based on Synthetic Information

在线全文

学校读者我要写书评

暂无评论

Journal of China University of Geosciences 2003年第3期14卷 207-214页

作者： Wang shicheng Ye Shuisheng zhou Dongdai Mineral Resources Institute of Comprehensive Information Prediction, Jilin University, Changchun 130026 Mineral Resources Institute of Comprehensive Information Prediction Jilin University Changchun 130026

Metallogenic prognosis of synthetic information uses the geological body and the mineral resource body as a statistical unit to interpret synthetically the information of geology, geophysics, geochemistry and remote sensing from the evolution of geology and puts all the information into one entire system by drawing up digitalized interpretation maps of the synthetic information. On such basis, different grades and types of mineral resource prospecting models and predictive models of synthetic information can be established. Hence, a new integrated prediction system will be formed of metallogenic prognosis (qualitative prediction), mineral resources statistic prediction (determining targets) and mineral resources prediction (determining resources amount).

关键词： synthetic information mineral resources prediction theory and method

全数字直流调速装置在棒线材连轧生产线上的应用

在线全文

学校读者我要写书评

暂无评论

冶金自动化 1999年第1期23卷 34-37页

作者：周世成大连钢铁集团有限责任公司工程设计院!大连116031

介绍ＳＩＭＯＲＥＧＫ６ＲＡ２４全数字直流调速装置在棒线材连轧生产线上的应用，说明其配置、功能及特点。结果表明：采用此种全数字直流调速装置能有效提高直流调速传动控制系统的设计及调试效率、运行可靠性及维护水平

关键词：全数字直流调速装置主传动辅助传动参数组态

全数字大功率交流变频调速装置在线材精轧机组上的应用

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

冶金自动化 1999年第3期23卷 23-27页

作者：周世成张忠慧大连钢铁集团有限责任公司棒线材分厂大连钢铁集团有限责任公司工程设计院!大连116031

介绍一种电流源交－直－交变频器型全数字大功率交流变频调速装置在棒线材连轧生产线线材精轧机组主传动上的应用，说明其配置、功能、工作原理及特点。由于应用此种变频调速装置，简化了设计、安装及调试过程，提高了电气设备的控制... 详细信息

介绍一种电流源交－直－交变频器型全数字大功率交流变频调速装置在棒线材连轧生产线线材精轧机组主传动上的应用，说明其配置、功能、工作原理及特点。由于应用此种变频调速装置，简化了设计、安装及调试过程，提高了电气设备的控制性能及运行可靠性，保证了产品质量。

关键词：大功率交流变频调速装置矢量控制负载换相

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

一刀切断甘蔗动力学仿真试验

农业机械学报 2011年第1期42卷 68-73页

作者：周仕城杨望杨坚梁兆新莫建霖广西大学机械工程学院南宁530004 广西农业机械研究院南宁530001

采用ANSYS/LS-DYNA显式动力学仿真软件,建立甘蔗-切割器系统的动力学仿真模型,且进行了甘蔗切割物理试验验证。利用四因子二次通用旋转组合设计方法和甘蔗-切割器系统仿真模型进行一刀切断甘蔗的仿真试验,建立影响因素与切割力和剪应力... 详细信息

采用ANSYS/LS-DYNA显式动力学仿真软件,建立甘蔗-切割器系统的动力学仿真模型,且进行了甘蔗切割物理试验验证。利用四因子二次通用旋转组合设计方法和甘蔗-切割器系统仿真模型进行一刀切断甘蔗的仿真试验,建立影响因素与切割力和剪应力的数学模型,研究了切割力和剪应力各影响因素及其交互作用的影响规律,且对影响因素进行优化,获得了一刀切断甘蔗时可靠性为95%的最佳切割力总区间。结果表明,刀片刃角为17.5°,切割角为27.73°,刀盘倾角为28°,切割速度为16 m/s时,可靠性为95%的最佳切割力范围为235.82~297.98 N。

关键词：甘蔗最佳切割力影响因素动力学仿真

取代芳基磷酸酯钠盐成核剂的晶体结构与聚丙烯附生结晶的过程

在线全文

学校读者我要写书评

暂无评论

石油化工 2017年第1期46卷 36-43页

作者：张恰赵世成周帅石尧麒辛忠上海市多相结构材料化学工程重点实验室上海200237 华东理工大学化学工程联合国家重点实验室化工学院产品工程系上海200237

分别以甲醇和N,N-二甲基甲酰胺(DMF)为溶剂,用溶剂挥发法制备两种不同晶体结构的2,2’-亚甲基双(4,6-二叔丁基苯基)磷酸钠(NA40)成核剂单晶。用单晶XRD法确定晶体的晶胞参数,并与等规聚丙烯(iPP)的晶胞参数比较,研究NA40与iPP的附生结... 详细信息

分别以甲醇和N,N-二甲基甲酰胺(DMF)为溶剂,用溶剂挥发法制备两种不同晶体结构的2,2’-亚甲基双(4,6-二叔丁基苯基)磷酸钠(NA40)成核剂单晶。用单晶XRD法确定晶体的晶胞参数,并与等规聚丙烯(iPP)的晶胞参数比较,研究NA40与iPP的附生结晶关系。表征结果显示,NA40-MeOH和NA40-DMF均能与iPP发生附生结晶,有较好的成核性能,c轴长分别为1.1950nm和1.2619nm,约为iPP晶体c轴(0.650nm)的2倍,失配率分别为8.79%和3.78%,小于附生结晶能发生的10%~15%失配率上限。两种成核剂对iPP性能的改善作用相近,成核剂用量为0.1%(w)时,较空白iPP的弯曲模量提高约20%,拉伸强度提高10%,球晶尺寸均减小。

关键词：磷酸酯钠盐聚丙烯成核剂附生结晶