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煤矿机械的电气设备自动化调试技术

机械管理开发 2018年第11期33卷 228-229页

作者：冯贵东阳泉煤业(集团)有限责任公司煤炭销售公司山西阳泉045000

阐述目前煤矿设备自动化技术发展和现状,探讨调试的主要意义,分析相关配套措施,并对于自动化控制模式的应用提出一些合理的见解。

关键词：煤矿机械电气设备自动化调试技术

NON-EXISTENCE OF CONJUGATE-SYMPLECTIC MULTI-STEP METHODS OF ODD ORDER

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Journal of Computational Mathematics 2007年第6期25卷 690-696页

作者： Yandong Jiao guidong Dai Quandong feng Yifa Tang LSEC ICMSEC Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijin9 100080 China Graduate School of the Chinese Academy of Sciences Beijin9 100080 China LSEC ICMSEC Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100080 China

We prove that any linear multi-step method G1^T of the form ∑k=0^mαkZk = T∑k=0^mβkJ^-1↓ΔH（Zk） with odd order u （u≥ 3） cannot be conjugate to a symplectic method G2^T of order w （w 〉 u） via any generalized linear multi-step method G3^T of the form ∑k=0^mαkZk = T∑k=0^mβkJ^-1↓ΔH（∑l=0^mγklZl）. We also give a necessary condition for this kind of generalized linear multi-step methods to be conjugate-symplectic. We also demonstrate that these results can be easily extended to the case when G3^T is a more general operator.

关键词： Linear multi-step method Generalized linear multi-step method Step-transition operator Infinitesimally symplectic Conjugate-symplectic.

Regulating the interfacial charge transfer and constructing symmetry-breaking sites for the enhanced N_(2) electroreduction activity

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Carbon Energy 2023年第2期5卷 193-200页

作者： Xiaoxue Zhang Yuehan Cao Zhen-feng Huang Shishi Zhang Chengguang Liu Lun Pan Chengxiang Shi Xiangwen Zhang Ying Zhou guidong Yang Ji-Jun Zou Key Laboratory for Green Chemical Technology of the Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjinChina Collaborative Innovative Center of Chemical Science and Engineering(Tianjin) TianjinChina Zhejiang Institute of Tianjin University NingboZhejiangChina State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation School of New Energy and MaterialsInstitute of Carbon NeutralitySouthwest Petroleum UniversityChengduSichuanChina XJTU-Oxford International Joint Laboratory for Catalysis School of Chemical Engineering and TechnologyXi'an Jiaotong UniversityXi'anShaanxiChina

The Haber-Bosch process for industrial NH_(3) production is energy-intensive with heavy CO_(2) *** N_(2) reduction reaction(NRR)is an attractive carbon-neutral alternative for NH_(3) synthesis,while the challenge associated with N_(2) activation highlights the demand for efficient ***,we demonstrate that PdCu nanoparticles with different Pd/Cu ratios anchored on boron nanosheet(PdCu/B)behave as efficient NRR electrocatalysts toward NH_(3) *** and experimental results confirm that the highly efficient NH_(3) synthesis can be achieved by regulating the charge transfer between interfaces and forming a symmetry-breaking site,which not only alleviates the hydrogen evolution but also changes the adsorption configuration of N_(2) and thus optimizes the reaction pathway of NRR over the separated Pd *** with monometallic Pd/B and Cu/B,the PdCu/B with the optimized Pd/Cu ratio of 1 exhibits superior activity and selectivity for NH_(3) *** study provides new insight into developing efficient catalysts for small energy molecule catalytic conversion via regulating the charge transfer between interfaces and constructing symmetry-breaking sites.

关键词： catalyst design electrochemical N_(2)reduction interfacial charge transfer reaction mechanism symmetry-breaking sites

Vancomycin-encapsulated hydrogel loaded microarc-oxidized 3D-printed porous Ti6Al4V implant for infected bone defects:Reconstruction,anti-infection,and osseointegration

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Bioactive Materials 2024年第12期42卷 18-31页

作者： Teng Zhang Wenhao Zhou Wanliang Yang Jingwei Bi Hao Li Xianlei Gao Baoliang Zhang guidong Shi Ka Li Zhijian Wei Xin Pan Shiqing feng Department of Orthopedics Qilu Hospital of Shandong UniversityJinan250012China Shaanxi Key Laboratory of Biomedical Metallic Materials Northwest Institute for Non-ferrous Metal ResearchXi’an710016China International Cooperation Base of Spinal Cord Injury Tianjin Key Laboratory of Spine and Spinal Cord InjuryDepartment of OrthopedicsTianjin Medical University General HospitalTianjinChina

Infected bone defect is a formidable clinical *** approaches to prevention and treatment for infected bone defects are *** key elements of the treatment are bone defect reconstruction,antiinfection,and *** treatment methods remain unsatisfactory owing to the absence of composite integrating materials with anti-infective,and osteogenic activities as well as proper mechanical strength at the same *** this study,we fabricated a vancomycin-encapsulated hydrogel with bacteriaresponsive release properties combined with a shaved porous(submicron-micron)three-dimensional-printed Ti6Al4V *** implant surface,modified with submicron-sized pores through microarc oxidation(MAO),showed enhanced osteogenic activity and integrated well with the hydrogel drug release system,enabling sustained vancomycin *** vitro experiments underscored the commendable antibacterial ability,biosafety,and osteoinductive *** antibacterial and osteogenic abilities of the implant were further demonstrated in vivo in infected rabbit bone *** results showed that the vancomycinencapsulated hydrogel-loaded microarc-oxidized 3D-printed porous Ti6Al4V can repair the infected bone defects with satisfactory anti-infection and osseointegration effects.

关键词： Porous Ti6Al4V implants Infected bone defects Anti-infection Osseointegration

8.2%-Efficiency hydrothermal Sb_(2)S_(3) thin film solar cells by two-step RTP annealing strategy

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Science China Materials 2024年第11期67卷 3666-3674页

作者： Hui Deng Xinxin feng Qiqiang Zhu Yonghao Liu guidong Wang Caixia Zhang Qiao Zheng Jionghua Wu Weihuang Wang Shuying Cheng College of Physics and Information Engineering Institute of Micro-Nano Devices and Solar CellsFuzhou UniversityFuzhou 350108China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108China Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering Changzhou 213164China

Antimony sulfide(Sb_(2)S_(3))solar cells fabricated via hydrothermal deposition have attracted widespread *** annealing crystallization process plays a crucial role in achieving optimal crystallinity in hydrothermal Sb_(2)S_(3)thin ***,incomplete crystallization and the loss of sulfur at high-temperature contribute to defect recombination,constraining device ***,a twostep rapid thermal processing(RTP)annealing strategy is proposed to improve the crystal quality and efficiency of Sb_(2)S_(3)solar *** annealing process in Ar protection with atmospheric pressure can suppress S loss caused by saturated vapor *** two-step RTP annealing with the 330℃ low-temperature and 370℃ high-temperature process ensures high crystallinity and vertical orientations of Sb_(2)S_(3)thin films,accompanied by a reduction in defect concentration from 1.01×10^(12)to 5.97×10^(11)cm^(-3).The Sb_(2)S_(3)solar cell achieves an efficiency of 8.20%with an enhanced open circuit voltage(VOC)of 784 *** build-in voltage(Vbi)of 1.17 V and irradiation-dependent ideal factor(n)of 1.48 demonstrate enhanced heterojunction quality and suppressed defect recombination in the *** presented two-step annealing strategy and physical mechanism study will open new prospects for high-performance Sb_(2)S_(3)solar cells.

关键词： Sb_(2)S_(3) solar cells hydrothermal two-step annealing defect passivation

人诱导性多能干细胞的供体来源及其表观遗传学研究现状

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中华实验外科杂志 2017年第11期34卷 2003-2006页

作者：史桂东周先虎冯世庆天津医科大学总医院骨科 300052

诱导性多能干细胞（iPS）是干细胞领域的研究热点，在组织工程学研究、自体细胞移植、药物研制和开发等诸多领域有着广泛应用前景。其具有类似胚胎干细胞（ES）的自我更新和多分化潜能，在体内外可以分化成多种成熟细胞，并且避免了胚... 详细信息

诱导性多能干细胞（iPS）是干细胞领域的研究热点，在组织工程学研究、自体细胞移植、药物研制和开发等诸多领域有着广泛应用前景。其具有类似胚胎干细胞（ES）的自我更新和多分化潜能，在体内外可以分化成多种成熟细胞，并且避免了胚胎干细胞在伦理道德制约、免疫排斥等方面的诸多问题。近年来再生医学的发展，尤其是干细胞技术的进步，iPS作为良好的＂种子细胞＂已成为国内外干细胞研究领域的前沿热点。随着iPS研究的不断深入以及临床实践的探索，其有望成为再生医学领域的一把利器。本文就iPS的人类供体细胞对比及表观遗传学方面进行综述。

关键词：诱导性多能干细胞供体细胞表观遗传学再生医学

基于线路实测载荷的转向架构架台架试验方法研究

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机械工程学报 2023年第14期59卷 213-221页

作者：陶桂东王文静冯永华李广全北京交通大学机械与电子控制工程学院北京100044 中车青岛四方机车车辆股份有限公司青岛266111

以高速列车转向架构架为研究对象,线路试验获取了转向架轴箱弹簧载荷和一系减振器载荷时程曲线,分析列车进出站、不同速度等级、载荷作用频率对弹簧载荷和一系减振器载荷的影响规律及载荷差异性。采用准静态加载台架试验得到弹簧载荷、... 详细信息

以高速列车转向架构架为研究对象,线路试验获取了转向架轴箱弹簧载荷和一系减振器载荷时程曲线,分析列车进出站、不同速度等级、载荷作用频率对弹簧载荷和一系减振器载荷的影响规律及载荷差异性。采用准静态加载台架试验得到弹簧载荷、一系减振器载荷与构架端部疲劳关键区域应力之间的传递关系,结合线路实测载荷计算得到应力响应曲线,进而获取构架在弹簧载荷、一系减振器载荷及两种载荷耦合作用下的疲劳损伤值。据疲劳损伤一致性理论计算车辆设计寿命里程下构架的弹簧等效载荷和一系减振器等效载荷,并建立基于等效载荷的疲劳损伤计算公式,确定弹簧等效载荷和一系减振器等效载荷的幅值大小及相位关系,最后形成了基于线路实测载荷的构架台架试验方法。研究表明,列车进出站时轴箱弹簧载荷出现较大的载荷波动,最大波动范围为17.48 kN,一系减振器载荷对低频位移响应不敏感;在相同线路条件下,随着列车运营速度的增大,轴箱弹簧载荷和一系减振器载荷均呈现增大趋势,其载荷作用频率主要分布在0~60 Hz范围内;同时在该频带内,随着载荷作用频率的增大,两种载荷间相位差不断减小,该变化规律与减振器动态特性有关。计算得到构架端部在弹簧载荷、一系减振器载荷及耦合载荷作用下的疲劳损伤分别为0.014、0.011、0.061,进而得到弹簧等效载荷和一系减振器等效载荷分别为7.54 kN、4.51 kN;当一系减振器等效载荷相位超前于弹簧等效载荷约60°时,构架疲劳损伤与线路实测疲劳损伤值相同,则在构架台架试验时两种等效载荷间相位差可选取40°~60°。

关键词：转向架构架轴箱弹簧一系减振器等效载荷疲劳损伤

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田间育种播种机精密排种器的试验(英文)

农业工程学报 2012年第S2期28卷 59-64页

作者：孙庆卫王延耀王东伟栾贵东冷峰青岛农业大学机电工程学院青岛266109

精密排种器是田间育种播种机的核心部件,为了测定排种器的性能,采用二次回归正交旋转对试验进行设计,运用JPS-12 排种器性能检测试验台对气吸式精密排种器排种性能进行研究进行试验研究,得到粒距合格率范围为 72.31%～98.17%,漏播率范围... 详细信息

精密排种器是田间育种播种机的核心部件,为了测定排种器的性能,采用二次回归正交旋转对试验进行设计,运用JPS-12 排种器性能检测试验台对气吸式精密排种器排种性能进行研究进行试验研究,得到粒距合格率范围为 72.31%～98.17%,漏播率范围为 0.51%～18.7%,重播率范围为 0.91%～23.07%。对试验结果进行回归分析,得出回归方程,并用MATLAB 绘制三维图,得到各个试验因素对试验指标影响的强弱,研究结果可为精密排种器的优化设计提供依据。

关键词：精准农业排种试验气吸式排种器 MATLAB

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对数生长期酿酒酵母胞内代谢情况分析

食品与发酵工业 2022年第22期48卷 68-75页

作者：曹凤任红黄桂东祝智航陈忻钟先锋佛山科学技术学院食品科学与工程学院广东佛山528231 广东省传统发酵食品工程技术研究中心广东佛山528231 广东省食品流通安全控制工程技术研究中心广东佛山528231 佛山市酿造工程技术研究中心广东佛山528231 佛山市农业生物制造工程技术研究中心广东佛山528231

酿酒酵母是发酵产业中的关键微生物,处于对数生长期的酵母菌迅速繁殖,积累大量初级代谢产物,对此时期进行调控可以提高发酵效率。为了解对数生长期酿酒酵母发酵情况,采用液相色谱串联质谱法(liquid chromatography tandem mass spectrom... 详细信息

酿酒酵母是发酵产业中的关键微生物,处于对数生长期的酵母菌迅速繁殖,积累大量初级代谢产物,对此时期进行调控可以提高发酵效率。为了解对数生长期酿酒酵母发酵情况,采用液相色谱串联质谱法(liquid chromatography tandem mass spectrometry,LC-MS/MS)对酵母胞内主要代谢物及其代谢途径进行分析。结果表明,在对数生长期酿酒酵母胞内共鉴定927种代谢物,含氮和含硫化合物数量及相对含量均最高。这些代谢物参与的代谢途径中,核苷酸代谢、辅因子和维生素代谢、碳水化合物代谢以及氨基酸代谢为酿酒酵母主要代谢途径,核苷酸代谢中相对含量最高的为嘧啶代谢。代谢物和代谢途径主要涉及酵母细胞膜的构建,遗传信息的复制,信号分子的传递,渗透压的调节等。为酵母提供生长所需的基本小分子物质和能量,同时为合成蛋白质、核酸等生物大分子物质提供原料。此外,碳水化合物和氨基酸代谢的代谢流分布可更好地支持酿酒酵母进行核苷酸代谢,促进酵母菌的增殖、生长和存活。该研究结果为定向改造酿酒酵母、提高其发酵效率提供一定科学依据。

关键词：酿酒酵母对数生长期胞内代谢代谢物代谢途径