焉耆盆地原油物理化学特征及油源对比研究

在焉耆盆地侏罗系三工河组和八道湾组均发现原油,目前关于侏罗系产层原油的油源问题存在不同的认识。对研究区原油的物理、化学性质进行系统的研究,认为侏罗系三工河组和八道湾组原油不仅在物理性质上有一定的差别,而且在地球化学组成及生物标记化合物上也有一定的差异,应具有不同的来源。侏罗系三工河组原油属于典型腐殖型干酪根成因,而侏罗系八道湾组原油除了具有腐殖型干酪根成因的某些特征外,还具有湖相泥岩生烃的特点。通过原油与各类源岩生物标志物进一步对比分析发现,侏罗系三工河组原油与西山窑、三工河组烃源岩及石炭系、三叠系烃源岩地球化学特征均存在明显差异,与侏罗系八道湾组烃源岩对比性较好。侏罗系八道湾组原油与八道湾组、三叠系源岩有一定相似性,因此认为八道湾组源岩为其主要源岩,三叠系源岩也有一定的贡献。目前勘探生产主要以八道湾组烃源岩为目标,下一步应加强对三叠系烃源岩贡献区带的勘探部署。      

碳酸二甲酯的市场需求和生产技术进展

介绍了碳酸二甲酯的价格、生产情况及国内外市场需求 ,指出碳酸二甲酯在我国具有极大的市场潜力。综述了生产碳酸二甲酯的三类主要方法 ,介绍了光气法、酯交换法和氧化羰基化法的各种具体方法及尚未实现工业化仍在研究中的其他方法。并对各种工业化的生产方法从技术、经济和清洁性的角度进行了分析 ,指出适合我国采用的工业合成方法是气相氧化羰基化法和甲醇与 CO2 直接合成法     

Monte Carlo simulations to determine coating uniformity in a Wurster fluidized bed coating process

This paper presents a coating model to predict the mass coating uniformity in a Wurster fluid bed coater using a Monte Carlo method. The velocity and voidage data obtained using imaging techniques on the same Wurster coater are used as inputs to the model. The semi-circular Wurster fluid bed used in this work was 22.9 cm in diameter. A batch of 3.6 kg tablets was used to conduct coating experiments and the coating weight gain distribution results were compared to predictions from the simulation. The model rigorously considers the sheltering effect of particles as they move in the spray zone. Good agreement was obtained when comparing the results with an analytical model.Spray shape and orientation of discretization were found to play an important role in predicting the coating uniformity. A simple spray experiment in a particle-free bed showed that the direction of spray material, in general, was vertically upward. Simulation results confirmed that an upward cylindrical spray model gives better agreement with experimental results compared to a solid cone spray model. Finally, the model was used to predict the changes in coating uniformity with bed operating conditions such as gas velocity and gap height. A wider coating distribution was found for the case with the lower gas velocity and gap height.     

Failure analysis and wear mechanism study of a heavily loaded gear

Failure analysis and a study of the wear mechanism were performed on a heavily loaded carburized gear with some unusual features. The analysis showed that the different failure forms on the tooth surface of the gear were dependent on the sub-surface shearing stress, the lubrication conditions and the surface roughness. Delaminations formed on the addendum surface were the main reason for the gear failure. A suggestion for improvement has been tried, and a desirable result has been obtained.     

触摸屏用保护膜光学性能评价研究

通过测试不同材质和功能的触摸屏保护膜的光透射比、反射比,分析了不同保护膜的透光性、防眩光性和防蓝光性,并利用光学性能计算方法得到了膜的光透射比值.为相关检测和研究机构开展手机屏幕保护膜评价工作提供参考.     

双馈异步发电机序阻抗建模简化方法

新能源发电系统的序阻抗模型广泛应用于系统的稳定性分析和谐振分析。双馈异步发电机进行序阻抗建模时可以使用电机的电压和磁链方程或等效电路。虽然等效电路使建模过程得以简化,但是其建立的模型忽略了励磁支路的影响,且没有对简化的条件进行分析,使此类建模方法的使用产生困难。因此,基于是否计及励磁支路的电机等效电路,利用谐波线性化方法建立了双馈异步发电机转子侧的序阻抗模型,在此基础上分析两种阻抗模型之间的差异并明确简化模型的使用条件。仿真结果验证了所建立序阻抗模型的准确性,分析表明当电机的励磁支路阻抗远大于定转子阻抗时,简化模型可代替准确模型。     

A1-Li合金的拉伸断裂过程研究

以2090 Ce合金为研究对象，对不同时效时间的室温拉伸断口进行了半定量分析，探讨了拉伸性能对断裂特征的响应关系，重点分析合金分层裂纹的形成过程。研究表明：2090 Ce合金的断裂方式以韧窝、分层开裂和沿亚晶界开裂3种为主，随时效时间的延长，韧窝、分层开裂逐渐减少，沿亚晶界开裂比例逐渐加大：分层开裂程度与时效程度有密切关系：分层开裂过程与试样内部受力状态、晶界状态有密切关系。分层最先发生在试样中心，随后在二分之一、四分之一……处反复发生，最终将试样分割成一系列平行的薄板。时效后期由于亚晶界的弱化，使裂纹倾向沿亚晶界扩展，从而抑制分层开裂的发生，同时导致合金强度，尤其是塑性的下降。     

钛合金中亚晶的电子显微镜观察

用透射电子显微镜观察了TC6钛合金在高温退火过程中形成的亚晶(Subgrain)。合金经850℃,920℃退火后炉冷和空冷,在初生α相晶粒内形成亚晶,多为成簇分布的狭长形状,亚晶的数量随退火后冷却速度的增加而减少。亚晶界(Subgrain boundary)是由位错构成的,亚晶的形成是多边化(polygonization)的结果。     

Efficient object detection based on selective attention

In this paper, we make use of biologically inspired selective attention to improve the efficiency and performance of object detection under clutter. At first, we propose a novel bottom-up attention model. We argue that heuristic feature selection based on bottom-up attention can stably select out invariant and discriminative features. With these selected features, performance of object detection can be improved apparently and stably. Then we propose a novel concept of saccade map based on bottom-up attention to simulate the saccade (eye movements) in vision. Sliding within saccade map to detect object can significantly reduce computational complexity and apparently improve performance because of the effective filtering for distracting information. With these ideas, we present a general framework for object detection through integrating bottom-up attention. Through evaluating on UIUC cars and Weizmann–Shotton horses we show state-of-the-art performance of our object detection model.     

城市住宅全装修化的多元瓶颈与破解策略

随着我国社会经济的进步和住宅建设的不断发展,全装修住宅正逐渐进入人们的生活,并引起日益增多的重视和关注。但由于我国住宅全装修起步较晚,相关验收标准、制度法规、保障服务等尚不完善,因此,房产企业在全装修住宅的开发建设中遇到了不少瓶颈,也缺乏内在动力,而购房者则因认知差异、信任危机,还不很愿意接受全装修住宅。为此,必须在借鉴国际先进经验、完善体制机制法制、破解质量税收服务等瓶颈的基础上,努力推进我国全装修住宅开发的部品化、标配化、系统化、产业化和市场保障化。