The durability of trouser's appearance involves the durability of crease and seam line after pressing, bagging resistance, wrinkle resistance, pilling resistance on the surface during wear. These properties are ve...The durability of trouser's appearance involves the durability of crease and seam line after pressing, bagging resistance, wrinkle resistance, pilling resistance on the surface during wear. These properties are very important for the tailored trousers. It is investigated how the durability of trousers appearance is related to properties of the blend ratio of wool and PET, the yarn structure and fabric mechanical properties.展开更多
When mining the fully-mechanized longwall caving face along strike, the unstable equipment, the low top-coal recovery ratio and the difficulty in controlling surrounding rock may occur due to large dip angle. Consider...When mining the fully-mechanized longwall caving face along strike, the unstable equipment, the low top-coal recovery ratio and the difficulty in controlling surrounding rock may occur due to large dip angle. Considering the effects of strike angle on support stability, the ‘‘support-surrounding rock"mechanical models of support topple and support slip were established in this paper. On the basis, the influencing factors of support stability were analyzed and the technical measures of controlling support and surrounding rock stability were put forward. Then the loose particles simulation experiment was conducted to analyze the impacts of caving directions and methods on the top-coal recovery in large dip angle fully-mechanized caving face. Finally, the ‘‘upward sequence and double-openings doublerounds" caving technology was determined. The research results are of great scientific significance and practical values to improve large dip thick seam mining technology.展开更多
由于油气管道敷设于地下,在敷设过程中管道会经过不同的地区,从而遭受不同程度的腐蚀,严重的可能导致管道开裂,造成巨大的人员伤亡和经济损失。因此,开展管道钢在模拟土壤环境中的电化学腐蚀行为研究,对于保证油气管道的安全运行具有重...由于油气管道敷设于地下,在敷设过程中管道会经过不同的地区,从而遭受不同程度的腐蚀,严重的可能导致管道开裂,造成巨大的人员伤亡和经济损失。因此,开展管道钢在模拟土壤环境中的电化学腐蚀行为研究,对于保证油气管道的安全运行具有重要的意义。为此,采用电化学阻抗技术(EIS)和动电位极化测试技术,研究了X90管道钢直缝焊管母材和焊缝在近中性模拟土壤溶液(NS4)中的电化学腐蚀行为。结果表明:1在NS4溶液中,X90管道钢具有典型的阳极溶解特征,没有钝化现象;2母材的热力学稳定性高于焊缝的热力学稳定性;3在-850 m V极化电位下对母材和焊缝试样进行不同时间的极化,随着极化时间的延长,材料的极化电阻增加,腐蚀电流密度下降,材料的耐蚀性增加且母材的耐蚀性优于焊缝。展开更多
This paper presents the structure models founded in shallow seam, the roof asymmetry arch with three articulations in roof first weighting and the step voussoir beam in roof periodic weighting. These structure models ...This paper presents the structure models founded in shallow seam, the roof asymmetry arch with three articulations in roof first weighting and the step voussoir beam in roof periodic weighting. These structure models are differ from classic theory, it establishes the new roof control theory of instability structure roof, especially in shallow seam. Based on the new roof structure theory, the support working state of "given sliding load" is put forward, and the factor of load transmitting is introduced to determine the load on roof structure. Therefore, the proper and accurate calculating methods of support resistance are established. Based on this, the dynamic structure theory in shallow seam could be predicted.展开更多
基金The project was assisted by the Quartemaster Institute of General Logistic Department CPLA
文摘The durability of trouser's appearance involves the durability of crease and seam line after pressing, bagging resistance, wrinkle resistance, pilling resistance on the surface during wear. These properties are very important for the tailored trousers. It is investigated how the durability of trousers appearance is related to properties of the blend ratio of wool and PET, the yarn structure and fabric mechanical properties.
基金provided by the National Key Basic Research Program of China (973 Program) (No. 2015CB251600)the Qing Lan Projectthe Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
文摘When mining the fully-mechanized longwall caving face along strike, the unstable equipment, the low top-coal recovery ratio and the difficulty in controlling surrounding rock may occur due to large dip angle. Considering the effects of strike angle on support stability, the ‘‘support-surrounding rock"mechanical models of support topple and support slip were established in this paper. On the basis, the influencing factors of support stability were analyzed and the technical measures of controlling support and surrounding rock stability were put forward. Then the loose particles simulation experiment was conducted to analyze the impacts of caving directions and methods on the top-coal recovery in large dip angle fully-mechanized caving face. Finally, the ‘‘upward sequence and double-openings doublerounds" caving technology was determined. The research results are of great scientific significance and practical values to improve large dip thick seam mining technology.
文摘由于油气管道敷设于地下,在敷设过程中管道会经过不同的地区,从而遭受不同程度的腐蚀,严重的可能导致管道开裂,造成巨大的人员伤亡和经济损失。因此,开展管道钢在模拟土壤环境中的电化学腐蚀行为研究,对于保证油气管道的安全运行具有重要的意义。为此,采用电化学阻抗技术(EIS)和动电位极化测试技术,研究了X90管道钢直缝焊管母材和焊缝在近中性模拟土壤溶液(NS4)中的电化学腐蚀行为。结果表明:1在NS4溶液中,X90管道钢具有典型的阳极溶解特征,没有钝化现象;2母材的热力学稳定性高于焊缝的热力学稳定性;3在-850 m V极化电位下对母材和焊缝试样进行不同时间的极化,随着极化时间的延长,材料的极化电阻增加,腐蚀电流密度下降,材料的耐蚀性增加且母材的耐蚀性优于焊缝。
文摘This paper presents the structure models founded in shallow seam, the roof asymmetry arch with three articulations in roof first weighting and the step voussoir beam in roof periodic weighting. These structure models are differ from classic theory, it establishes the new roof control theory of instability structure roof, especially in shallow seam. Based on the new roof structure theory, the support working state of "given sliding load" is put forward, and the factor of load transmitting is introduced to determine the load on roof structure. Therefore, the proper and accurate calculating methods of support resistance are established. Based on this, the dynamic structure theory in shallow seam could be predicted.
