液压支架性能试验浅解     

刘振华 《河北能源职业技术学院学报》2011,11(4):60-62,65

阐述了液压支架立柱、千斤顶和安全阀必须做型式试验,所做试验的内容及性能要求。提出了液压支架整架试验要求,包括操作性能、密封性能、支护性能、适应性能、强度要求、耐久性能要求（强度要求包括主体结构强度要求和辅助机构强度要求等）。  相似文献   

开采上保护层效果检验技术研究     

张志勇  徐传田 《淮南职业技术学院学报》2011,(3):1-3

煤与瓦斯突出严重影响了矿井安全生产,开采保护层是最有效、最经济的防治措施;通过对海孜矿上保护层开采效果研究,结果表明：开采前后瓦斯压力及含量降低明显,卸压区内瓦斯抽采率可达33.2%;卸压区内煤层透气性系数比未卸压区的增大三倍;相似模拟实验表明9煤的膨胀率为8.1‰,综合分析确定开采上保护层后对9煤起到了明显的卸压保护作用,研究结果为相似条件下保护层开采提供了参考。  相似文献   

掏槽爆破掘进效率的装药研究     

邸云信  谢兴华  严仙荣  刘绍瑜  邱明灿  徐雪原 《淮南职业技术学院学报》2011,(6):23-25

通过对掏槽爆破的实验研究,利用火药和猛炸药的联合装药方式,改变了以往的单一装药结构．模拟实验的结果表明,联合协同装药结构与单一装药结构的掏槽效果有着显著的区别．前者的掏槽效果要优于后者;同时通过炸药水下的测试结果表明,改进以后的装药结构的冲击波峰值压力的持续时间明显提高,即联合装药的爆炸生成气体量要大于单一装药,为爆破工程上快速高效的掘进提供了理论依据。  相似文献   

高职学生患者致病菌耐药性分析     

彭友明 《孝感职业技术学院学报》2011,(3):102-103,58

目的：了解高职学生患者常见致病菌的种类及耐药情况,为临床抗感染治疗提供参考依据。方法：对来自高职学生患者的68株致病菌进行菌种鉴定和药敏试验,并对结果进行统计分析。结果：高职学生患者致病菌种的前三位分别是金黄色葡萄球菌（36．76％）、铜缘假单胞菌（17．65％）、大肠埃希氏菌（16．18％）;药敏试验结果显示,金黄色葡萄球菌对万古霉素、利奈唑胺和达福普汀的敏感率较高保持为100％,但对青霉素G的耐药率很高,达到97．5％,铜绿假单胞菌对各类抗生素的耐药性均较强。结论：金黄色葡萄球菌对多种抗生素耐药率提高,临床上应重视药敏试验,根据药敏试验结果合理选用抗菌药。  相似文献   

Modeling of polishing process for electric stainless-steel kettle     

WU Chang-lin  XU Zao-kun  FAN Qing-rong  GUO Min 《重庆大学学报(英文版)》2011,10(4):191-195

The market of stainless electric steel kettles is growing significantly, but the main mechanism for polishing kettles via traditional handwork operations limits the growth of electric kettle manufacturing. Based on the successful multi-tool automatic polishing system for electric stainless steel kettles, regression analysis and orthogonal tests were employed to construct a polishing process model, with a purpose to improve the automatic polishing technology for electric stainless steel kettles. The model reveals the relationship between the surface roughness and processing parameters including gringding depth, abrasive tangent speed, workpiece rotating speed and axial feeding speed. Simulation and experimental results are in agreement,which shows that this modeling method is feasible in practice, and it can also be used as a guidance for planning automatic polishing process of electric stainless-steel kettles.  相似文献   

Consistently inconsistent: An examination of the variability in the identification of emotional disturbance     

Kristin Scardamalia  Keisha L. Bentley‐Edwards  Kairys Grasty 《Psychology in the schools》2019,56(4):569-581

The federal definition of emotional disturbance (ED) has been heavily criticized as vaguely defined and poorly operationalized yet there has not been a formal analysis of the reliability of the ED criteria. This study examined the reliability of the federal criteria for a special education designation of ED. A total of 179 school psychologists reviewed a mock special education report, made an eligibility determination, and provided information about their eligibility decision. In all, 56 participants found the student met ED eligibility criteria using 16 different combinations of the five criteria. Krippendorff’s α, a statistic preferred for content analysis, was calculated as a measure of criterion reliability. Results indicated extremely poor reliability (α = 0.2011). These findings demonstrate the importance of redefining the existing criteria.  相似文献   

不稳定液位的检测     

薛晓红  韩春霞 《重庆职业技术学院学报》2011,20(2):163-165

对液位测量现有方案作了阐述及其优缺点比较,针对现有液位测量方法不能较好地测量不稳定液位的问题,提出了利用CYG13固态压阻式压力传感器进行不稳定液位测量的方法,并对其进行了验证,实验结果表明方案有效。  相似文献   

数字集成电路参数测试仪的设计     

何碧贵  何世彪 《重庆职业技术学院学报》2011,20(3):155-156

针对现有集成电路测试设备结构复杂,功能单一的缺点,本文利用FPGA核心板、D／A模块、A／D模块、电流转换电压电路等器件,采用SOPC技术,设计了一个中小规模通用数字集成电路测试系统,在逻辑功能测试的基础上。实现了74系列中小规模数字集成电路直流性能参数的测试。通过实验,将测试结果与标准的反相器参数进行比较,数据结果一致。表明参数测试仪符合设计要求,设计方案具有一定的参考价值。  相似文献   

The Teacher Behavior Inventory: validation of teacher behavior in an interactive lecture environment     

Siti Nurma Hanim Hadie  Asma’ Hassan  Saiful Bahri Talip  Muhamad Saiful Bahri Yusoff 《Teacher Development》2019,23(1):36-49

Students’ rating of teacher behaviors provides valuable information on teaching improvement and instructional quality. Unfortunately, there is a lack of new validated instruments for measuring teacher behaviors. The Teacher Behaviors Inventory is an old inventory that was initially developed to measure teaching behaviors as regards lecture-based instructions, which is effected through the use of low-inference items. The aim of this study was to assess its continued suitability in the present educational setting by examining its construct validity and internal consistency through the lens of one lecturer’s teaching behaviors, as rated by 527 students after six interactive lectures. The variables evaluated, as mentioned above, were achieved after an items removal process, which resulted in a 32-item version. Apart from being valid and reliable, this condensed version allows for immediate assessment of teaching behaviors after an instruction session as the rating procedure is now more straightforward and less time-consuming, and also enables a reduction in rating errors. Therefore, the 32-item format serves as a practical diagnostic feedback tool in the present educational arena, permitting a longitudinal teaching behavior assessment to enhance teachers’ professional development.  相似文献   

碳基复合材料有效性能的细观力学研究     

周振云  胡耀华  马李 《台州学院学报》2011,33(3):14-19

作为一种多相体材料,碳基复合材料的力学性能和损伤破坏规律与其组元材料的弹性常数、体积含量以及细观结构密切相关。独创了组元材料试样加工与拉伸试验方法,获得了石墨基体和碳纤维的拉伸模量、强度和断裂应变率,在此基础上利用细观力学中Eshelby等效夹杂理论和Mori-Tanaka方法,建立了预报材料弹性常数的细观力学模型,并将理论预报结果与试验结果进行了比较,分析了误差产生的原因。结果表明：理论预报值与试验值之间的误差在10%以内,说明计算模型合理,计算结果可信。  相似文献