打造职业特色鲜明的国家级精品课程——以建设“流体力学泵与风机”课程为例

精品课程是学校办学水平的重要标志,"流体力学泵与风机"课程充分反映高职教育特色。本文介绍"流体力学泵与风机"精品课程的教改及精品课程建设过程,从教学体系的改革、教学内容的改革、师资队伍建设、教学方法和手段使用、教材建设、实训环节的开展等方面对职业技能的培养作了详细的论述。     

A novel 3-stage structure for a low-noise,high-gain and gain-flattened L-band erbium doped fiber amplifier

The configuration of the novel three-stage L-band erbium-doped fiber amplifier with very large and flat gain and very low noise figure presented in this paper uses the forward ASE (amplified spontaneous emission) from the first section of the EDF (erbium-doped fiber) and the backward AS E from the third section of the EDF (both serve as the secondary pump sources of energy) to pump the second EDF. To improve the pump efficiency, the power of the pump is split into two parts(with a ratio of e.g. 2:7). The characteristics of this L-band EDFA are studied on the basis of the Giles Model with ASE.     

压裂泵阀箱失效研究

压裂泵是油气田上产增存的主要设备,但其液力端阀箱却经常早期失效。通过对现场使用的各型压裂泵阀箱的综合对比分析,对阀箱基体常见失效准则进行了归纳,开展了阀箱失效模式的研究。综合现场失效数据分析,认为疲劳开裂是阀箱最主要和最危险的失效模式。     

地源热泵在盈江县边桥酒店的应用

地源热泵又称地源中央空调,是利用地球所储存的太阳能资源作为冷热源进行能量转化的供暖制冷空调系统.它利用地下常温土壤或地下水,具有稳定相当问题的特性.使用地源热泵可以减少矿物燃烧的消耗,有利于国家改善能源结构,减低有害气体的排放,从而达到环保和可持续发展的目标.本文以设计德宏州盈江县边桥酒店空调热水方案为例,简述地源热泵的U型埋管传热模型理论分析,并对土壤的传热过程进行计算,得到地埋管附近的温度场变化情况,并且与实际试验数据进行拟合.     

城市大型排涝泵站泵型选型的认识与实践

文章就城市大型排涝泵站对水泵的选型要求分析新型高压潜水泵与常规立式泵的优缺点、安全性、经济性、结合浦西排涝泵站选用高压潜水泵实践，说明此类工程中选用该泵带来的经济、环境和社会效益。     

提高4吋砂泵使用寿命的有效途径

分析了巴里选矿厂4吋砂泵运行的影响因素,提出了提高砂泵使用寿命的主要措施。     

Role of pump prime in the etiology of cardio-pulmonary bypass associated acidosis

The development of metabolic acidosis during cardio-pulmonary bypass (CPB) is a well recognized but poorly explained phenomenon. It has been hypothesized that it is purely a development after the delivery of pump prime. A retrospective study was conducted at our hospital on 68 patients who underwent elective coronary artery bypass grafting (CABG). Sampling of arterial blood was performed at three time intervals: (T₁) Baseline, prior to induction; (T₂) 5 minutes after initiation of CPB and prior to administration of cardioplegia solution; (T3) during rewarming prior to weaning the patient off CPB. Measurements of Na⁺, K⁺, Cl⁻, pH, pCO₂, HCO₃ ⁻, Base excess, Anion gap, Strong ion difference at each collection point were performed. Results were analyzed in a quantitative manner. On delivery of pump prime, all patients' developed metabolic acidosis. However, it is very important to distinguish the metabolic acidosis as their management varies. Anion gap has been found to be useful in managing peri-operative metabolic acidosis.     

调制噪声对单模激光光强相关函数的影响

采用信号直接调制色泵噪声的单模激光增益模型,用线性化近似方法研究了反映激光动力学统计性质的光强相关函数,发现泵噪声的自关联时间相当于力学中阻尼振荡的阻尼系数,它的大小决定光强相关函数随时间t的演化形式．     

延长高危潜油电泵井检泵周期方法的探讨

南堡油田某采油区电泵井总井数30口,其中电缆绝缘值低或者无绝缘的风险井18口,占电泵总井数的60%.为了防止这些高危电泵井躺井影响产量,针对这些高危电泵井加强了精细化管理,结合油井实际的生产状况,及时分析电流、压力、液面、泵工况、清蜡、加药等现场资料,摸索制定出高危潜油电泵井的现场管理方法,延长了油井的检泵周期.     

详解汽车宽带型氧传感器

详细分析汽车宽带型氧传感器的基本原理、构造和未来的发展方向,并结合例图分析氧传感器的工作过程.