职业技能鉴定质量分析初探

职业技能鉴定是推行职业资格证书制度的重要环节,鉴定的质量直接关系到职业资格证书的真实性、权威性。通过对试卷的有效性和可靠性的分析,以及对试题难度、区分度的分析,对职业技能鉴定质量的分析方法进行了探讨,阐述了质量分析在职业技能鉴定中的作用。     

综采工作面过断层采煤实践

介绍了大同煤矿集团公司挖金湾矿断层构造情况。总结了技术经验，针对具体条件，该矿综采过断层采煤采取了直接割煤、割顶（底）和预掘巷与割底相结合等过断层措施，取得了较好的效果。     

试论融资租赁项下的进口贸易

阐述了当前跨国公司在合同中普遍采用的融资租赁的性质及融资租赁项下的进口贸易特点。     

The Synthesis of Sulfated Titanium Oxide Nanotubes

TiO₂ nanotubes can be prepared in gram quantities by treating anatase TiO₂ powder with concentrated NaOH solution. These TiO₂ nanotubes acquired strong acidity after being impregnated with sulfuric acid solution and calcined at 300 °C. The anatase TiO₂ powder used to prepare the nanotube did not catalyze the esterification between cyclohexanol and acetic acid, while sulfated TiO₂ nanotubes were very reactive toward the esterification reaction.     

75t/d生活垃圾焚烧处理中试线设计和运转

75t/d 生活垃圾焚烧处理中试线建于上海奉贤区泰日镇,主要处理奉贤南桥、齐贤、奉浦、泰日地区生活垃圾。工厂于2001年7月正式投入运行,2002年元月通过技术鉴定。“生活垃圾焚烧处理技术装备开发研究”属上海市建委资助项目。本文介     

Using motion from orthographic views to verify 3-D point matches

The specific problem addressed by the authors is how to detect the true match of a fourth point from among candidate matches in a situation in which three points have already been matched. The two sets of points to be matched are both subject to measurement errors. The depth error is more dominant than errors in the other two coordinates; however, the exact statistical distribution of the measurement errors is not known. The authors present a new method for solving the problem. The method is based on the technique of motion analysis using orthographic views. It discards the noisy z (depth) coordinates and uses only the x and y coordinates of the points to verify the match. The effect of depth errors on the motion estimate is completely prevented. Results show that this method is substantially more effective than previous methods that use all three coordinates     

桥梁支座的更换

桥梁支座是桥梁上、下部结构的连接点。由于交通运输的需要,交通不能中断或应尽量缩短中断时间,因此,对桥梁支座的更换方案选择显得极其重要。以某工程为例,详细叙述了整体更换桥梁支座的施工方案选择、施工方法及要点。