高职学生顶岗实习网络管理系统的设计与开发

高职学生顶岗实习网络管理系统是利用PHP作为前端的应用开发工具,以MySQL作为后台的数据库来开发的,主要实现学生顶岗实习毕业设计的管理。本系统主要有个人信息、学生实习、学生就业、在线通知、文档管理、师生在线交流等功能模块。整个系统界面整洁、功能完备,具有较强的实用性。     

实例在食科专业物理化学教学中的应用

物理化学是食科专业的必修课程,其理论在食品行业中具有广泛的应用。但物理化学理论性强、内容抽象,是学生视为最难学的课程。在教学过程中,将实例分析引入物理化学的课程,不仅能激发学生学习的积极性和主动性,还可培养学生分析问题和解决问题的能力。文章通过浅析部分章节的实例,对食科专业物理化学教学实例应用进行了探讨。     

Distribution and genesis of the anomalously high porosity zones in the middle-shallow horizons of the northern Songliao Basin

High-quality reservoirs occur in the middle-shallow horizons of the northern Songliao Basin. The distribution and genesis of their anomalously high porosity zones were studied using measured porosities, examination of ordinary thin sections and blue epoxy resin-impregnated thin sections and by SEM. The results show that there are three anomalously high porosity zones at the depth of 450–900 m, 1,300–1,900 m, 2,050–2,350 m respectively, named zone i, zone ii and zone iii from top to bottom. Horizontally, zone i and zone ii are distributed all over the basin except in the Southeastern Uplift, while zone iii is only distributed in the Central Depression. Zone i was formed by meteoric water leaching as well as organic acid dissolution. Zones ii and iii were dominantly formed by organic acid dissolution. Additionally, clay mineral transformation generating H⁺ and hydrocarbon emplacement retarding the cementation of sandstones are also important for the formation of zones ii and iii.     

普通烟草栽培种内株高性状主基因加多基因遗传分析

以普通烟草栽培种烤烟类型品种分别与香料烟、白肋烟和名优晾晒烟类型品种组配的F1、F2及其亲本为研究对象,利用数量性状主基因+多基因遗传体系分离分析方法分析了3组合4世代株高性状的遗传规律.结果表明,3个组合的株高性状遗传均符合两对加性-显性-上位性主基因+加性-显性多基因混合遗传模型(E1),同时均存在加性、显性遗传效应.各主基因和多基因遗传率计算结果,烤烟与晒晾烟、烤烟与香料烟组合的主基因遗传率较高,分别为71.60%和88.55%,可作为烟草株高性状早期世代选择的理论依据.     

枕头坝导流明渠子围堰防渗抗冲设计与施工

枕头坝一级水电站坝址地质构造特殊,且施工过程中导流明渠方案发生变化,需要改变招标阶段确定的子围堰防渗灌浆方案。简要介绍了2010年和2011年子围堰的防冲方案设计,并通过水力模型试验得出了抗冲需要抵御的流速,据此对钢筋石笼进行了技术改造,以维护防冲体的整体稳定性。实践表明,枕头坝导流明渠围堰在2010年和2011年安全度汛,防冲体经受住了大洪水的考验,为后期的导流明渠顺利按期分流打下了坚实的基础。     

涂敷脲醛树脂的石英晶体微天平湿度传感器

在碱性条件下预先合成脲醛树脂单体,然后在酸性条件下于石英晶体的电极上原位合成脲醛树脂高分子薄膜,制备了石英晶体微天平湿度传感器。同时考察敏感膜厚度对检测灵敏度的影响以及传感器的响应特性、重复性和稳定性。试验结果表明:涂敷脲醛树脂薄膜的传感器频率随测试的相对湿度变化明显,传感器具有良好的重复性和稳定性。制作的湿度传感器可应用于实际的生产、生活中。     

枕头坝一级水电站导流明渠防渗方式的对比选择

枕头坝一级水电站导流明渠纵向子围堰基础下游段为深覆盖层,防渗工程量大。本文主要从纵向子围堰防渗方式试验、对比、选择、施工等进行了论述。通过试验合理选择成熟、可靠的防渗方式,达到了基坑干地施工效果、控制投资,保证了导流明渠基坑开挖和混凝土施工进度和质量,为顺利地实现工期目标打下了基础     

Reflection-type single long-pulse solar simulator for high-efficiency crystalline silicon photovoltaic modules

Photovoltaic module measurements are predominantly taken by using pulsed solar simulators. However, significant errors can be generated when the existing simulators are applied to current high-efficiency crystalline silicon photovoltaic modules. This paper presents the design and implementation of a novel solar simulator featuring reflection-type light source and single long-pulse flash. The analysis and experimental study of the capacitance effect and the technical details of the simulator including reflection-type lamp house, xenon flash lamp power supply, and source-measure unit are introduced. The results show that the complete system achieves Class AAA performance in accordance with the international standard. The proposed simulator outperforms other similar products on the market and has been adopted by some well-known photovoltaic module manufacturers. The practical application demonstrates that this high-performance and cost-effective simulator is quite suitable for photovoltaic module production line.     

徐深气田火山岩储层储集空间特征及影响因素分析

针对徐深气田火山岩储层特点,综合运用岩心观察、镜下鉴定、录井资料解释和岩相划分等微观与宏观相结合的方法,在对气田的火山岩岩石类型和火山岩相特征认识的基础上,对储层的储集空间特征及其影响因素进行了详细的研究,对气田的开发具有重要的指导意义.     

瀑布沟水电站料场开采方案研究

瀑布沟水电站工程规模大，大坝填筑量大、上坝强度高、施工干扰大。本文主要从料场规划、开采方案、质量安全控制措施等进行论述和研究，通过合理规划，精心组织，科学管理，满足高峰期上坝强度要求，保证大坝施工质量，完成工期目标。