刍议国内工程机械技术性贸易措施体系及其完善

本文以工程机械领域技术性贸易措施体系之完善为视角,剖析现状、分析问题、提出有关完善建议,旨在为工程机械行业跨越国外技术壁垒尽绵薄之力。     

液相色谱串联质谱测定狗肉中的氯化琥珀胆碱

用Na_2CO_3—NaHCO_3缓冲盐震荡超声提取狗肉的氯化琥珀胆碱,过WCX固相萃取柱净化,液相色谱三重四极杆串联质谱定性、定量。结果表明,氯化琥珀胆碱在0.5~250.0ng/mL浓度范围内线性关系良好(r=0.999 87),回收率达96%以上,精密度小于13%,检出限为0.004 mg/kg。因此,该方法可用于狗肉中氯化琥珀胆碱快速、灵敏、准确的测定。     

基坑降水引起的沉降变形数学模型研究

在系统分析了基坑降水引起不均匀沉降的机理基础上,通过分析比较降水引起沉降量数学模型,选择优异实用的模型作为计算工具,以昆明典型地质特点为研究对象,对典型基坑降水措施对周边造成的不均匀沉降进行分析研究。     

链板输送机拐点“变速效应”损纸初探

提出了链板输送机拐点"变速效应"的概念,并对纸卷经过2台链板输送机结合部时由于拐点"变速效应"对纸卷造成损伤的过程进行分析,得出了链板输送机损纸只能适当减轻而无法免除的结论。     

江汉盆地潜江组与沙市组盐间非砂岩油气藏勘探潜力对比

在江汉盆地潜江凹陷潜江组发育盐间非砂岩油气藏。江陵凹陷沙市组也沉积了一套含盐地层，但盐间非砂岩油气藏发育程度不如潜江组。沉积特征、成藏条件和成藏机制研究发现，两套含盐地层及其盐韵律特征的差异受构造环境、古气候环境控制。潜江组沉积时期，断陷活动强，形成补偿或欠补偿的深水沉积环境，利于有机质堆积，盐韵律特征由纯盐岩层和盐间深灰色泥岩、油页岩、含芒硝白云岩和白云岩等组成，深灰色泥岩、油页岩为有利烃源岩，含芒硝白云岩和白云岩等为有利储集层，具备形成盐间非砂岩油气藏的条件。沙市组沉积时期，断陷活动弱，气候干旱，形成补偿到过补偿的沉积环境，盐韵律由含膏盐岩、膏质盐岩和盐间紫色、灰色泥岩或含芒硝泥岩组成，烃源岩和储集层条件较差，但其下段上部的一套灰色盐岩、膏岩夹灰色泥岩组成的盐韵律层存在勘探潜力。图6表1参18     

湿法磷酸蒸发浓缩系统有关问题的探讨

分析了大型的湿法磷酸蒸发浓缩系统沸腾机理, 介绍了联动试车时如何保护石墨换热器。阐述了蒸发器胶板衬里剥落问题的原因, 并采取了改进措施, 获得良好效果。     

Heat transfer,flow regime and instability of a nano- and micro-porous structure evaporator in a two-phase thermosyphon loop

Two-phase flow instabilities which may occur at low and high heat loads were studied for a thermosyphon loop with R134a as refrigerant. The heat transfer surface of the evaporator was enhanced with a copper nano- and micro-porous structure. The heat transfer of the enhanced evaporator was compared to a smooth surface evaporator. Finally, the influence of the liquid level and the inside diameter of the riser on the instability of the system have been investigated.It was found that the enhanced structure surface decreased the oscillations at the entire range of heat fluxes and enhanced the heat transfer coefficient. Three flow regimes were observed: Bubbly flow with nucleate boiling heat transfer mechanism, confined bubbly/churn flow with backflow and finally churn flow at high heat fluxes.     

刚性抗滑桩随机可靠性分析

为了计算刚性抗滑桩稳定性可靠度指标及失效概率, 首先建立了抗滑桩锚固段内桩侧土体受压稳定性的功能函数, 然后引入验算点法(JC 法)对失效模式进行计算, 得出了可靠度指标和相应的失效概率。通过实例对比了JC法与安全系数法计算结果, 结果表明, 在安全系数满足要求的条件下, 失效概率仍偏高, 故在抗滑桩的设计计算中有必要引入可靠度理论。     

Effects of processing variables on the morphology and diameter of electrospun poly(amino acid ester)phosphazene nanofibers

Poly[（alanino ethyl ester）_0.67（glycino ethyl ester）_0.33 phosphazene]（PAGP）was synthesized,and morphology and diameter of the electrospun PAGP nanofibers were systematically evaluated by using a cool field emission scanning electron microscope（SEM）with changing the important processing variables such as applied voltage,polymeric concentration,and ambient temperature.The average diameter of PAGP nanofibers was inversely proportional to the applied voltage,but increased with the increase of solution concentration.Lower environmental temperature was unfavorable due to the nanofibers conglutination.     

谈碎石土地段隧道进洞技术

以慕家梁隧道进洞施工为例,通过施工方案比选确定了具体施工方案,并对施工要点及技术措施进行了全面阐述,经综合措施的实施,施工期间掌子面掘进平稳,顺利下穿210国道,为类似隧道进洞设计及施工积累了经验。