走进多彩季节

进入盛夏,风云瞬变,江河奔涌,草叶摇绿,花期叠现。风带雷多了,云带雨多了,花带露多了,叶带珠多了。彩虹多了,雨伞多了,看花的多了,观景的多了,亲近大自然的多了。这是个多彩的季节,我们的生活充满色彩。     

推行精益生产 提升市场竞争力

中国石化江汉石油钻头股份有限公司以现场5S管理打造出了一流的制造现场;导入TPM,增强了设备可靠度,缩短了生产线上的流转时间;开辟了"VIP"生产线通道,增强了生产的柔性。为快速响应市场,高效率地提升运行效率,公司遵循精益原则,加强了现场管理,保障了生产流程畅通;构建了生产流程标准化,加快了生产节奏,缩短了生产周期;践行精益理念,降低了资源耗费,实现了利润最大化。     

逆作法在地下泵房施工中的应用

通过采用逆作法有效的对地下泵房进行施工,取得了实效,同时保证了地下泵房和邻近主厂房的平行施工顺利实施,减少了工程量,降低了工程造价,做到了质优、价廉,保证了施工,获得了较为满意的效果。     

棱镜耦合法的理论改进与实验设计

为了能更精确地测量薄膜厚度及其折射率,介绍了一般棱镜耦合法的测量理论和实验方法,分析了一般的棱镜耦合法测量模型本身存在的理论误差.从测量理论上对棱镜耦合法进行了改进,提出了精确测量模型,减小了上述理论误差,同时给出了薄膜参数的简便计算方法,从理论上分析了薄膜参数计算方法的误差.用传输矩阵的方法进行了模拟论证,设计了实验装置,测量了在玻璃基底上甩胶法得到的Su 8薄膜,测量结果表明,改进的精确测量模型减小了测量误差,提高了测量精度.     

强化工程质量监督的措施

本文探讨了强化工程质量监督的措施,提出要提高了质监系统的执法地位,强化了监管职能,而且加强了队伍建设,提高了人员素质,确保了工程质量的稳步提升。     

体视化及三维交互技术在地质体仿真中的应用

论述了体视化的基本原理和方法,针对地质模型与地质数据的特点,对原有体视化方法进行了简化和改进,提高了模型重构的速度;对体视化中用到的三维人机交互问题进行了研究,提出了一些关键问题的解决方案,实现了三维仿真环境中基本的人机交互功能,提高了系统的易用性和灵活性,并以武汉程潮铁矿为例,对系统进行了验证,取得了良好的效果．     

海龟水翼运动模型及仿生推进机构研究

针对海龟水翼运动的特点,进行了仿水翼推进系统的研究.基于水翼运动的抽象分析,建立了二自由度水翼运动模型,描述了水翼运动典型状态下的翼态特征.设计了仿生运动机构,分析了其运动学特性,为优化仿生推进机构的设计与控制提供了依据.基于PC104和DSP构建了仿生机构的控制系统,实现了运动控制器的模块化设计.搭建了单肢运动实验平台,从功能仿生角度实现了水翼运动,试验验证了仿水翼机构运动的可行性和控制系统的有效性,丰富了水下推进理论.     

共产国际、苏联与国民党改组

1923年-1926年间,在共产国际、苏联及中国共产党的帮助下,国民党的建设获得了大发展.政治建设方面,改组了国民党,制定了新纲领;组织和纪律建设方面,健全了地方党部,培养了干部队伍,严格了纪律;宣传建设方面,加强了民众宣传,稳固了革命基础.     

化工专业生产实习的改革与实践

根据课程的衔接情况合理确定了生产实习的时间,建立了符合能力培养要求的稳固的实习基地,理顺并落实了生产实习各环节的程序,用独具特色的做法充实了实习内容,优化了成绩考核方法,大大提高了企业参与的程度,突出了能力培养的特色,更好的体现了工程教育专业认证和卓越工程师教育培养的特点。     

柱塞火焰热喷涂工艺的探究与实践

针对石油钻井作业中的柱塞零件工作环境恶劣,寿命短的特点,为改进产品的性能,延长工件的使用寿命,对柱塞的生产工艺进行了改进研究.采用火焰热喷涂技术,设计、研制了喷涂设备,优化了工艺参数,从而提高了产品的综合性能,延长了产品使用寿命,同时降低了生产成本,取得了良好的使用效果及经济效益.     

6061合金吊钩时效强化工艺研究

研究了实际生产中的时效热处理工艺对6061合金吊钩强度的影响,对产品采用机械加工后直接人工时效及先固溶再时效的两类时效工艺;测定了强度及硬度值;用光学显微镜和透射电子显微镜进行了显微组织观察;比较了不同时效工艺的试样在性能和组织方面的变化;提出了相对较为经济有效的时效强化工艺．     

Strength and failure characteristics of brittle jointed rock-like specimens under uniaxial compression:Digital speckle technology and a particle mechanics approach

The strength and failure characteristics of most natural rock mass are influenced by discontinues such as fissures, joints, and weak surfaces. In the present study, the strength and failure behavior of ubiquitousjoint rock-like specimens under uniaxial loading have been investigated by DIC(digital image correlation) and discrete element numerical method(PFC2 D). The results are obtained. Firstly, the UCSJof specimens with c = 15° or 30° shows similar tendency while a goes from 0° to 75°. With c = 45° or 60°, the UCSJof specimens increases when a goes from 0° to 30° and decreases after a goes beyond 30°. With c = 75°, the peak UCSJvalue is reached when a = 0°. The UCSJvalue shows an increasing trend when a goes from 60° to 75°. Secondly, the ubiquitous-joint specimens present different failure modes for various levels of a and c(b-a). Based on the experimental results, the failure mode of ubiquitous-joint specimens can be classified into three categories: stepped path failure, failure through parallel plane, and failure through cross plane.     

Strength behaviour of sandstone subjected to polyaxial state of stress

The paper presents an experimental investigation on the strength behaviour of natural rock subjected to polyaxial state of stress. The polyaxial tests were conducted on cubical specimens of sandstone obtained from the Shivpuri district in Madhya Pradesh state of India, The specimens having nominal dimensions of100 mm x 100 mm x 100 mm were tested using a polyaxial testing machine. Twenty-five combinations of intermediate and minor principal stresses were applied and the specimens were loaded till failure occurs. It was observed that the intermediate principal stress has a substantial effect on the strength of the Shivpuri sandstone. A database of rock strength under various combinations of σ_2 and σ_3 was obtained for the Shivpuri sandstone. The database was used to study the predictability of five most commonly used strength criterion. Root mean square error(RMSE), average absolute relative error percentage(AAREP) and coefficient of accordance(COA) were used as indices for the measure of goodness of fit. It was observed that the least error in the prediction was shown by modified Mohr Coulomb criterion followed by modified Weibols and Cook criterion. A probability analysis of the error in prediction was also done.     

现代油井水泥的组成及性质

本文对水泥的起源发展进行了简要的描述。对水泥的组成、种类、性能及凝固、硬化机理进行了全面的论述,为油井用水泥的选择提供了依据。     

关于强度理论的几点探讨

针对实际工程计算中经常遇到的材料强度问题,探讨了第四强度理论和莫尔强度理论的推导过程,介绍了一些新的强度理论概念,并分析了不同强度理论在材料力学中的应用范围.     

Fracture evolution characteristics of sandstone containing double fissures and a single circular hole under uniaxial compression

The uniaxial compression experiments on the sandstone samples containing double fissures and a single circular hole were carried out by using electro-hydraulic servo universal testing machine to investigate the effect of rock bridge angle β and fissure angle α on mechanical properties and evolution characteristics of cracks.The results show that the peak strength,peak strain and elastic modulus of defected specimens decrease comparing with those for intact sample,and show a decreased trend firstly and then increase with β changing from 0° to 90°.The peak strength and elastic modulus achieve the minimum value as the rock bridge angle is 60°,while the peak strain reaches the minimum value with the rock bridge angle of 45°.The crack initiation of tested rock samples occurs firstly in stress concentration areas at tips of prefabricated fissures under uniaxial compression,and then propagates constantly and coalescences with the prefabricated hole.Some secondary cracks initiate and propagate as well until buckling failure happens.The rock bridge angle has a great influence on crack initiation,coalescence,final failure mode,crack initiation stress and transfixion stress.The peak strength varies significantly,while the elastic modulus and peak strain change slightly,and the failure modes are also different due to the influence of fissure angle.     

用Weibull理论研究体积对玻璃强度的影响

本文根据Weibull分布函数,分析了十一组玻璃试件的抗弯试验结果。探讨了玻璃体积对玻璃强度的影响,给出了体积与破坏概率之间关系曲线。     

串联系统的可靠度计算及其在强度可靠性中的应用

在系统可靠性理论中,串联系统是一种基本的也是应用广泛的系统。本文全面地论述了串联系统可靠度计算的方法,并探讨了它在机械强度和结构强度可靠性中的应用。     

水基冷粘合剂

水基冷粘合剂有天然的与合成的两大类,它具有较强的粘合强度与耐热能力,有特殊的渗透性能,比热融粘合剂耗能低,成本低,用途广。除用于各种纸板包装、软包装,还用于柔韧性要求高或塑料间的特殊粘合,是包装领域中应用最广泛的一类粘合剂。     

冲压钢高、中温力学性能的研究

本文研究了冲压钢在ＣＡＰＬ工艺过程中的高、中、温力学性能。结果表明，加热室中带钢温度在５５０－６００℃之间强度急剧下降，均热室中强度最低，过时效室中带钢的强度不受一次冷却速度和过时效时间的影响。