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外墙保温性能是制约装配式钢结构建筑推广应用的关键问题之一，目前对于钢结构外围护体系热工性能的研究还不充分，尚无关于我国严寒地区钢结构框架-ALC外墙传热机理和热桥效应的相关研究。针对严寒地区气候特点和建筑节能要求，基于ABAQUS软件，开展了钢结构框架-ALC外墙的传热性能有限元分析，揭示了钢梁、钢管混凝土柱以及梁柱节点等对墙体热工性能的影响机理，分析了保温体系类型、保温层热阻、ALC墙板热阻、钢梁连接件类型、框架柱截面形式、有无楼板等对墙体平均传热系数、热桥效应和内表面温度的影响。结果表明：保温层热阻对墙体的传热性能影响显著，而ALC墙板厚度和导热系数、连接件类型、框架柱形式等因素的影响相对较小，墙体平均传热系数随保温层或ALC墙板热阻的增大近似线性减小。相较于内保温体系，采用外保温可提高墙体内部温度，降低冷凝风险。研究结果可为我国严寒地区装配式钢结构外围护体系的热工性能设计及构造措施提供参考。

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Copyright of Engineering Mechanics / Gongcheng Lixue is the property of Engineering Mechanics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

目的 以皮层小梗死引起单纯手指无力的临床表现较为少见，本文旨在探讨其发病机制、临床及 影像学特点。 方法 连续入选2009年7月-2016年12月来郑州人民医院就诊的以手指功能障碍为临床表现的皮层 小梗死患者，临床上记录患侧手部肌力、手部感觉异常情况及手指无力的详细查体（屈、伸、内收和 外展，依据0～5级肌力记录法），并记录患者可能的发病机制或病因，依据主要功能障碍手指为小指 或拇指分为主要尺侧手指功能障碍组和主要桡侧手指功能障碍组。影像学上应用弥散加权成像进 行病灶定位，并测量大脑镰至病变中心及大脑最外侧缘的距离（其比率定义为B/A）。 结果 共入组符合标准的皮层小梗死患者13例，根据临床及影像学分析表明，主要累及尺侧手指 6例，主要累及桡侧手指7例。主要累及尺侧手指功能组B/A=0.50±0.07，主要累及桡侧手指功能组 B/A=0.71±0.06，两组比较差异有统计学意义（t =-5.67，P＜0.05）。主要累及尺侧手指功能组5例发 病机制为大动脉狭窄／栓子清除障碍，1例为不明原因栓塞；主要累及桡侧手指功能组4例发病机制主 要为动脉-动脉栓塞，2例为心源性栓塞，1例为烟雾病。 结论 尺侧手指代表区靠近皮层内侧，梗死部位位于大血管分水岭区，发病机制可能与低灌注有 关。桡侧手指代表区靠近皮层外侧，梗死部位位于大脑皮层，发病机制可能与栓塞事件有关。 Abstract: Objective Simple fingers weakness caused by small cortical infarction is rarely found in clinical practice. This study aimed to investigate the pathogenesis mechanism, clinical presentation and imaging features of such cases. Methods Outpatients with the main manifestation of fingers dysfunction caused by small cortical infarcts from Zhengzhou People’s Hospital from July 2009 to December 2016 were included in this study. The analyzed clinical data included sensory and moter functions in fingers, muscle strength of fingers (bending, stretching, adduction and outreach), and the possible pathogenesis mechanism or etiology in medical records. According to the predominant impaired fingers, the patients were divided into ulnar-lateral group and radial-lateral group. The locations of cerebral infarction were identified by diffusion weighted imaging. Based on the imaging, the distance from cerebral falx to lesion core (B) and distance from cerebral falx to the lateral margin of brain (A) were measured and the ration of B/A were calculated. Results A total of 13 cases with small cortex infarction were included, with 6 ones in ulnar-lateral group and 7 ones in radial-lateral group. B/A in ulnar-lateral group was (0.50±0.07), while B/A in radial-lateral group was (0.71±0.06), and the difference between the two groups had statistical significance (t =-5.67, P

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Copyright of Journal of Shaanxi University of Science & Technology is the property of Journal of Shaanxi University of Science & Technology Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Shaanxi University of Science & Technology is the property of Journal of Shaanxi University of Science & Technology Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Sodium allyl sulfonate ( SAS) and allyl alcohol polyoxyethylene ether 500 (APEG500) as the main chain, with dimethyl diallyl ammonium chloride (DMDAAC) and methacryloyloxyethyl three Methyl ammonium chloride (DMC) is a side chain and two types of zwitterionic dispersants (labeled FSJ-1 ? FSJ-2 , respectively) were synthesized. The struc ture and thermal stability of the dispersant were characterized by infrared spectroscopy and thermogravimetry. The effects of the amount of cationic monomer and the amount of disper-sant on the performance of coal water slurry were discussed. Studies shown that the ampho teric dispersant (FSJ-1) with DMDAAC cationic monomer is more effective. When the a mount of DMDAAC monomer is 10% (mass fraction) and the amount of dispersant is 0. 5 % (mass fraction) , the maximum slurry concentration of Xinjiang coal reached 59. 6 %，nd the Zeta potential reached -40. 4 mV，which is better than the naphthalene sulfonate, and the static stability of the slurry is obviously enhanced. [ABSTRACT FROM AUTHOR]

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