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端帮采煤机在露天煤矿中的发展和应用

露天采矿技术 2024年第4期39卷 25-27页

作者：梅斌新疆天池能源有限责任公司新疆昌吉831100

为了解决露天煤矿端帮压煤问题,特别是端帮下压煤量非常大的埋藏较深、煤层较厚露天矿,提高露天矿的原煤回收率,减少煤炭资源浪费,提升露天矿整体经济效益,分析了端帮采煤机在国内外的发展和应用情况,论述了端帮采煤安全保障技术和优劣... 详细信息

为了解决露天煤矿端帮压煤问题,特别是端帮下压煤量非常大的埋藏较深、煤层较厚露天矿,提高露天矿的原煤回收率,减少煤炭资源浪费,提升露天矿整体经济效益,分析了端帮采煤机在国内外的发展和应用情况,论述了端帮采煤安全保障技术和优劣势。端帮采煤机作为露天矿端帮特定条件下开采设备,是露天矿专属的开采工艺,可以更多地回收煤炭资源,可降低露天煤矿生产剥采比提升矿山整体经济效益。

关键词：露天矿端帮压煤端帮采煤机经济效益应用前景

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基于双向A^(*)-APF算法的船舶路径规划研究

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大连海洋大学学报 2024年第3期39卷 506-515页

作者：孟凡齐孙潇潇朱金善梅斌郑沛洁大连海事大学航海学院辽宁大连116026 上海船舶运输科学研究所有限公司上海200135

为解决目前船舶路径规划算法中存在的全局非最优解和局部最优解等问题,在双向A^(*)算法的基础上加入了优化函数PathOptimization和IsClear,以去除冗余拐点,缩短全局路径距离;在人工势场法(artificial potential field,APF)的基础上,设... 详细信息

为解决目前船舶路径规划算法中存在的全局非最优解和局部最优解等问题,在双向A^(*)算法的基础上加入了优化函数PathOptimization和IsClear,以去除冗余拐点,缩短全局路径距离;在人工势场法(artificial potential field,APF)的基础上,设定离散化步长函数、斥力感应阈值和临时终点,以避免局部最优解和震荡问题;实现两种算法的融合算法(双向A^(*)-APF算法),在MATLAB模拟的相同栅格图中,对比算法改进前后的模拟试验数据。结果表明,融合算法平均减少了50%的冗余拐点,平均减少了47.5%的算法搜索时间,平均缩短了7%的路径距离,能够同时安全规避动态障碍物和静态障碍物。研究表明,双向A^(*)-APF算法可用于解决船舶路径全局非最优解和局部最优解等问题。

关键词：双向A^(*)算法人工势场法路径规划融合算法

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Fatal hemolysis due to clostridium perfrigens blood stream infection

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Chinese Medical Journal 2013年第18期126卷 3572-3573页

作者： CAO bin SU Ling-ling LI bin-bin LIU Ying-mei Department of Infectious Diseases and Clinical Microbiology Beijing Chao-Yang Hospital Capital Medical University Beijing Institute of Respiratory Medicine Beijing 100020 China

Here we reported a 59-year-old woman with diabetes who was found to have massive hemolysis associatedwith clostridium （C.） perfringens blood stream infection. She died 13 hours after admission in spite of aggressive treatment. The lady referred to our hospital with high fever, chills, body ache and right hypochondriac pain for 1 day. Physical examination revealed a temperature of 39, heart rate of 110 beats/min, blood pressure of 101/69 mmHg, and a respiratory rate of 25 breaths/min. Pulse oximetry was 94% on room air. Chest auscultation revealed good air movement without rales. Tenderness of right upper abdomen was found. Abnormal laboratory results included white blood cell （WBC） count of 20x109/L with 90.9% neutrophils,

关键词： hemolysis sepsis blood stream infection bacteremia clostridium perfringens

Effect of Ball Scribing on Magnetic Shielding Efficiency of Grain-oriented Silicon Steel

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Journal of Iron and Steel Research International 2014年第7期21卷 679-684页

作者： Hao WANG Chang-sheng LI Rui-bin mei Gang HUO State Key Laboratory of Rolling and Automation Northeastern University Northeastern University at Qinhuangdao Branch Northeastern University Benxi Steel Posco Cold Strip Rolling Co. Ltd.

Magnetic shielding of grain-oriented silicon steel was investigated. Ball scribing with spacing of 2 to 16 mm was performed at peak flux densities of 8.0 mT to 1.3 T. Magnetic shielding efficiency was calculated, including absorption, reflection and inner multi-reflection shielding efficiencies. Magnetic shielding efficiency （MSE） increase ratios after different scribing spacing were compared, and thickness requirement to achieve absorption shielding of 50 dB was also calculated. The results show that magnetic shielding efficiencies of C711 and H668 silicon steels increase by 4.79 and 3.15 dB respectively after scribing of 16 mm. Before scribing, shielding efficiency of H668 steel was higher than that of C711 steel, while after scribing, both absorption and shielding efficiency gaps were largely abridged between C711 and H668 steels. Plate thickness of C711 steel could be reduced from 3.18 mm without scribing to 2. 20 mm after scribing of 16 mm. There is no apparent thickness reduction at lower flux densities; while the peak flux density is above 0.3 T, the shielding effect becomes apparent, and the thickness could be reduced from 2.28 mm without scribing to 1.70 mm with scribing spacing of 16 ram. Magnetizing process and its effect on variation of magnetic shielding were also analyzed.

关键词： magnetic shielding efficiency grain-oriented silicon steel absorption shielding reflection shielding inner multi-reflection shielding thickness reduction

Multi-task Coalition Parallel Formation Strategy Based on Reinforcement Learning

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自动化学报 2008年第3期34卷 349-352页

作者： JIANG Jian-Guo SU Zhao-Pin QI mei-bin ZHANG Guo-Fu Department of Computer and Information Science Hefei University of TechnologyHefei 230009P.R.China Engineering Research Center of Safety Critical Industrial Measurement and Control Technology Ministry of EducationHefei 230009P.R.China

代理人联盟是代理人协作和合作的一种重要方式。形成一个联盟，代理人能提高他们的能力解决问题并且获得更多的实用程序。在这份报纸，新奇多工联盟平行形成策略被介绍，并且多工联盟形成的过程是一个 Markov 决定过程的结论理论上被证... 详细信息

代理人联盟是代理人协作和合作的一种重要方式。形成一个联盟，代理人能提高他们的能力解决问题并且获得更多的实用程序。在这份报纸，新奇多工联盟平行形成策略被介绍，并且多工联盟形成的过程是一个 Markov 决定过程的结论理论上被证明。而且，学习的加强被用来解决多工联盟平行的代理人行为策略，和这个过程形成被描述。在多工面向的领域，策略罐头有效地并且平行形式多工联盟。

关键词：强化学习多任务合并平行排列马尔可夫决策过程

Hydrothermal Synthesis, Characterization and Photoluminescence Properties of GdOHCO3 Rhombic Microcrystals

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Chemical Research in Chinese Universities 2013年第5期29卷 841-844页

作者： ZHANG You-jin XU Zhen-yu YIN Xiao-bin HE Hong-mei Department of Chemistry University of Science and Technology of China Hefei 230026 P. R. China

GdOHCO3 rhombic microcrystals were synthesized by hydrothermal method with urea used as the preci- pitator. Experimental parameters, such as the molar ratio of the starting reagents, reaction temperature and reaction time were examined. The as-obtained product was characterized by powder X-ray diffraction（XRD）, field-emission scanning electron microscopy（FESEM）, X-ray photoelectron spectroscopy（XPS）, Fourier transform infrared spec- troscopy（FTIR） and spectrofluorometry. The main reactions to form GdOHCO3 were proposed. In addition, the pho- toluminescence（PL） properties of GdOHCO3 rhombic microcrystals were discussed. The broad band located between 350 nm and 600 nm in the emission spectrum can be attributed to the self-trapped exciton luminescence.

关键词： GdOHCO3 Hydrothermal method Crystal growth Rhombic microcrystal Photoluminescence

“茶叶生物化学”一流课程建设改革的探究与思考

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教育教学论坛 2024年第28期 86-89页

作者：孙彬妹郑鹏张灵枝刘少群华南农业大学园艺学院广东广州510642

在新农科建设背景下,培养理论基础扎实、综合实践能力强的“新茶学”人才尤为重要。“茶叶生物化学”是茶学本科生的一门专业基础课程,其教学效果会对其他专业课程的学习有较深的影响,因而提升其课程教学质量十分关键。对“茶叶生物化... 详细信息

在新农科建设背景下,培养理论基础扎实、综合实践能力强的“新茶学”人才尤为重要。“茶叶生物化学”是茶学本科生的一门专业基础课程,其教学效果会对其他专业课程的学习有较深的影响,因而提升其课程教学质量十分关键。对“茶叶生物化学”课程的教学现状进行分析,并对该课程教学改革方法进行探讨与研究,提出科学的教学方案及实施办法,以期为其他高校提高“茶叶生物化学”课程教学成效和教学质量,优化教学体系,培养拥有爱农学农、懂农强农知识体系的茶学人才提供思考和参考。

关键词：茶叶生物化学教学改革思政元素

Arsenic uptake and transport of Pteris vittata *** influenced by phosphate and inorganic arsenic species under sand culture

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Journal of Environmental Sciences 2007年第6期19卷 714-718页

作者： HUANG Ze-chun AN Zhi-zhuang CHEN Tong-bin LEI mei XIAO Xi-yuan LIAO Xiao-yong Centre for Environmental Remediation Institute of Geographical Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China

In order to understand the similarity or difference of inorganic As species uptake and transport related to phosphorus in Ashyperaccumulator, uptake and transport of arsenate （As（V）） and arsenite （As（Ⅲ）） were studied using Pteris vittata L. under sand culture. Higher concentrations of phosphate were found to inhibit accumulation of arsenate and arsenite in the fronds of P. vittata. The reduction in As accumulation was greater in old fronds than in young fronds, and relatively weak in root and rhizome. Moderate increases, from 0.05 to 0.3 mmol/L, in phosphate reduced uptake of As（Ⅲ） more than As（Ⅴ）, while the reverse was observed at high concentrations of phosphate （≥1.0 mmol/L）. Phosphate apparently reduced As transport and the proportion of As accumulated in fronds of P. vittata when As was supplied as As（Ⅴ）. It may in part be due to competition between phosphorus and As（Ⅴ） during transport. In contrast, phosphate had a much smaller effect on As transport when the As was supplied as As（Ⅲ）. Therefore, the results from present experiments indicates that a higher concentration of phosphate suppressed As accumulation and transport in P. vittata, especially in the fronds, when exposed to As（Ⅴ）, but the suppression of phosphate to As transport may be insignificant when P. vittata exposed to As（Ⅲ） under sand culture conditions. The finding will help to understand the interaction of P and As during their uptake process in P. vittata.

关键词： arsenate arsenite As species Pteris vittata L. phosphate transport uptake

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宁波舟山港岬角水域重载船舶操纵风险与对策

航海技术 2024年第4期 8-12页

作者：杨定照苑冰赵方斌魏铭君梅斌宁波引航站大连海事大学

岬角水域潮流情况多变,是船舶出现操纵困难乃至短时失控的高发区域。通过调研引航员实践经历、事故险情案例,分析宁波舟山港核心港区三处典型岬角水域的地形、地貌、潮流等特点,模拟潮流对船舶操纵的影响,预判岬角水域的潜在操纵风险,... 详细信息

岬角水域潮流情况多变,是船舶出现操纵困难乃至短时失控的高发区域。通过调研引航员实践经历、事故险情案例,分析宁波舟山港核心港区三处典型岬角水域的地形、地貌、潮流等特点,模拟潮流对船舶操纵的影响,预判岬角水域的潜在操纵风险,继而提出应对措施,可为驾引人员在此类水域的船舶操纵提供借鉴。

关键词：岬角水域船舶操纵航行风险对策