Comparing High-resistance Grounding Method with Resonance Grounding Method for Large Generators

For large generators, the problem of high-resistance grounding method and the advantages of resonance, grounding method are discussed in detail, and an overall comparison is given in this paper. It is recommended that the latter should be adopted so as to increase the operation reliability of large generators and power systems.

Comparison study on calculation methods of bending behavior of Chinese reinforced concrete beams from 1912 to 1949

In order to study the calculation methods of bending behavior of Chinese reinforced concrete beams from 1912 to 1949, tests on the mechanical performance of 66 rebars from different modem Chinese concrete buildings, the concrete compressive strength of 12 modem Chinese concrete buildings, and the concrete cover thickness of 9 modem Chinese concrete buildings are carried out; and the actual material properties and structural conformations of modem Chinese concrete buildings are obtained. Then, the comparison on calculation methods of bending behavior including the original Chinese calculation method, the present Chinese calculation method, the present American calculation method and the present European calculation method is studied. The results show that the original Chinese calculation method of bending behavior is based on the allowable stress calculation method, and the design safety factors are 3.55 to 4. 0. In term of the calculation area of longitudinal rebars of reinforced concrete beams, without considering earthquake action, the original Chinese structural calculation method is safer than the present Chinese structural calculation method, the present European structural calculation method, and the present American structural calculation method. The results can provide support for the structural safety assessments of modem Chinese reinforced concrete buildings.

Comparative Analysis of Improving Effects of 12 Maize Populations with Improved S_1 Selection Method

ln this study, 12 maize populations were improved with the improved S1 selection method, aiming to increase the improvement efficiency of maize popula-tions. The results showed that number of rows per spike, number of grains per row and 100-grain weight were the three important component traits of maize yield. The highest genetic increment was found in Mengqun 2, fol owed by Mengqun 4, Mengqun 1 and other 7 maize populations. Negative genetic increment was shown in Mengqun 3 and 3 introduced foreign maize populations. Some changes were shown in spikes, plant traits and genetic diversity of maize populations. Based on our results, we concluded that Mengqun 2, Mengqun 4, Zhongzong 7, Mengqun C and Mengqun A could be directly used for the line breeding by selfing for their higher genetic increment of yield and better improvement effects of other agricultural traits. Compared with these 5 populations, the improvement potential of other maize populations was limited for their lower genetic increment.

Compare and Contrast the Strengths and Weaknesses of Task-based Language Teaching Method and Audio Lingual Teaching Method and Study How They Impact Upon Both the Teachers and the Learners

This essay focused on comparing and contrasts audio lingual method and Task-based language teaching method,demonstrating the strengths and weaknesses of the two methods and discusses how they impact upon both the teachers and the learners.TBLT is the contemporary teaching method with a great number of strong points.It seems that if there is more relatively scientific and effective method,TBLT should give way to it.The ultimate goal is to advocate the comparatively successful teaching method in the field of foreign language education.

Trans-Cultural Comparative Literature Method:Using Grammar Translation Techniques and Communicative Language Teaching Effectively

Trans-Cultural Comparative Literature Method originated from the discovery of common themes and viewpoints as comparing literary texts in different languages. This article explains how the method combine GT and CLT techniques in a lesson plan that engage students with activities that compare and contrast themes and cultural aspects found in two literary texts. It explores worldviews using information and knowledge of literary structures that motivate Chinese students.

Comparative Studies on Calculation Methods of Shear Behavior of Reinforced Concrete Beams of Chinese Modern Reinforced Concrete Buildings

In order to study the calculation methods of shear behavior of reinforced concrete beams of Chinese modern reinforced concrete buildings,this paper carried out tests on the concrete compressive strength of 12 Chinese modern concrete buildings,the mechanical properties of 66 rebars from different Chinese modern concrete buildings,and the concrete cover thickness of 9 Chinese modern concrete buildings,and the actual material properties and structural configurations have been obtained. Then,the comparison on calculation methods include the Chinese original calculation method,the Chinese present calculation method,the American present calculation method and the European present calculation method is studied with case analysis method.The results show that the Chinese original calculation method of shear behavior of reinforced concrete beams is based on the allowable stress calculation method,and the design safety factors are 3. 55- 4. 00. The standard value of the compressive strength of concrete cubes is 8. 48 MPa,the standard value of the concrete tensile strength is 1.20 MPa,the standard value of the yield strength of rectangular rebars is 229. 56 MPa,and the standard value of the yield strength of round rebars is 276. 82 MPa. The average value of the concrete cover thickness of beams and columns is 35.96 mm. In term of calculation area of hoop rebars of reinforced concrete beams,without considering earthquake loads,the Chinese original structural calculation method is safer than the Chinese present structural calculation method,but is more unsafe than the American present structural calculation method and the European present structural calculation method. The results can provide the support for structural safety assessments and repair designs of Chinese modern reinforced concrete buildings.

Determination of work-hardening exponent for sheet metal using three-point method

Three characteristic points in the deformation history of a fractured tensile specimen are selected tocalculate two values of n( n1 and n2 ) to represent the hardening ability of material during the homogeneous plas-tic deformation and the following large plastic deformation. Experimental results obtained with mild streel andred copper show that n determined using the three-point method proposed is better to describe the hardening a-bility of material. It is therefore concluded that three-point method can be used to describe the hardening prop-erty of material during both homogeneous deformation and large plastic deformation.

Progress of Land Engineering Discipline and Comparative Study on Teaching Methods

This paper introduces the origin and development of land engineering.Taking the course Introduction to Land Engineering as an example,this paper makes a comparative analysis of the teaching effects of traditional teaching method and task-driven teaching method.The results show that the task-driven teaching method is more suitable for the teaching task of land engineering,the students’learning effect is remarkable,and the degree of realization of teaching goal is high.

高海拔铁路隧道施工安全风险管理策略研究

为弥补组织安全风险管理漏洞、提高高海拔地区铁路隧道施工安全风险管理绩效,采用扎根理论构建管理层面的高海拔地区铁路隧道施工安全风险管理策略框架,然后通过fsQCA方法构建策略选择组态模型,探讨安全风险管理能力与策略对于安全风险管理绩效影响的组态效应。研究结果表明:通过扎根理论分析识别出17条安全风险管理策略,基于Reason模型将其分为“组织规范策略”、“安全监督策略”、“前提保障策略”以及“行为规范策略”4个类别;在决策能力较强时,管理者需要将精力和资源着重偏向“安全监督策略”、“前提保障策略”以及“行为规范策略”;在决策能力较弱时,则需要注重全部4个类别所对应的安全风险管理策略的实施落实情况。研究结果可为提高高海拔隧道安全管理者的决策效率、保障施工安全进行提供一定参考。

两地无花果微量元素及总放射性物质分析与质量评估

目的评估新疆阿图什与江苏南通两地无花果产品质量。方法运用电感耦合等离子体质谱仪和总放测量仪,分别对新疆阿图什和江苏南通两地无花果微量元素和总放射性物质进行分析检测。结果新疆阿图什无花果与江苏南通本地无花果微量元素相比,铝、钾、钙、钒、锰、钴、镍、铜、锌、硒、钡等11种微量元素含量明显较高,镁和钼元素略低,铬元素较低。两地无花果的总α放射性物质和总β放射性物质均合格。结论新疆阿图什无花果产品质量优于江苏南通本地的无花果,具有较高的产品开发价值。

比较法提升实训课堂教学效果的实践探索——以高职会计专业增值税纳税申报实训项目为例

比较法是把内容或形式上有一定联系的事物加以比较,辨别异同或优劣,在教学过程中,“知同”可以帮助学生更好地理解和掌握事物的本质,“辨异”才能知悉差别,触类旁通。教师将比较法运用于高职会计专业纳税申报实训中,比较知识点之间的区别与联系,比较理论与实践的辩证关系,从而帮助学生更好地理解会计业务、法规条款与纳税申报的本质和规律。在提高课堂教学效果的同时,培养学生对知识的梳理能力以及学会摸索实际业务脉络的能力。

比较教育与人类发展:新世纪的进展

在促进人类发展的共同使命下,发展研究需以比较教育研究为基础。研究以《比较教育》期刊为主线,结合比较教育领域的整体进展,对比较涉及的国别、类型以及涌现出的概念、理论进行分析,发现新世纪比较教育研究开始关注“全球南方”,对南美洲、亚洲、非洲的教育研究开始增多,对欧洲的研究数量略有降低。比较教育对人类社会的发展保持着深切的关注,“全球南方”与“全球北方”被重新概念化;国际组织出现了新的治理形式,并参与到未来建构中;全球化与本土化在理论对话中有了新的内涵与关系;作为教育现象与社会现象的学习在话语上迎合了不同国家的发展需求;而比较教育中的隐喻和流动的身份为知识生产和实践提供了另一种视角;比较教育研究方法也有了进一步的争鸣与发展,这些均有助于比较教育完善自我,为人类发展贡献更多的智慧。

不同液化判别方法在下辽河地区的对比分析

结合海城地震液化资料,选取四种具有代表性的液化判别方法,通过判别结果与地震液化资料的对比分析,得出各种判别方法的优劣。四种方法可归纳为利用规范和室内实验两大类。结果表明:规范方法,判定结果的准确率为42.8%;调整的规范方法,准确率为88%;室内实验的输入正弦波方法,准确率为88%;室内实验的地震波法,准确率为77%。规范方法优点方便快捷,缺点是利用规范提供参数准确率有限;室内实验方法优点是物理原理清楚,缺点是需要进行土层地震反应计算。由此说明,利用规范方法,并适当调整参数,可以有效提高液化判定准确率。

构造法在比大小中的应用探索

构造法是一种重要的比较数与式大小的方法。常见的构造法包括构造图形与构造函数及不等式。用举例的方式分别介绍了常见的几种方法,重点是构造函数法。构造函数法又分利用同构式构建函数、利用等价关系比较大小、利用差商式构建函数、常值换元构造函数、根据凹凸性构造函数、利用不等式特点构建函数等方法。

荒漠草原灌丛转变过程土壤水分亏缺空间特征及影响因素

草地灌丛化对生态系统结构、功能与服务产生重要影响,目前已经认识到其对土壤水分的负面影响,但还缺乏其在区域尺度的定量评价及其驱动机制研究。在宁夏荒漠草原选取43块成对样地(即荒漠草地和灌丛地),引入样地土壤水分相对亏缺指数(PCSWDI)评价荒漠草原向灌丛转变后土壤水分亏缺空间格局现状及其驱动因子。结果表明:荒漠草原转变为灌丛后0~100 cm和100~200 cm土壤含水量分别显著下降了27.80%和57.92%,0~100 cm灌丛地的PCSWDI显著低于荒漠草地,表明0~100 cm灌丛地目前不存在土壤水分亏缺现象。地统计学分析表明,荒漠草地和灌丛地的0~100 cm土壤水分相对亏缺指数的结构方差比分别为94.73%和95.29%,均属于强空间自相关,主要受结构性因子控制。此外,地理探测器的因子探测发现0~100 cm土壤储水量、坡向和田间持水量是影响灌丛地土壤水分相对亏缺指数的主导因子;交互探测表明,灌丛地0~100 cm土壤水分相对亏缺指数空间分异是多因子共同作用的结果。尽管分析得到0~100 cm灌丛地不存在土壤水分亏缺,但100~200 cm土壤含水量显著下降已经预示了深层土壤水分的消耗。因此,干旱半干旱地区的植被恢复必须考虑其植被承载力和水分阈值,基于自然的解决方案可能是未来植被恢复的主流思路。

生成式AI在民族纹样设计中的实验研究

基于生成式人工智能(AI)的民族纹样设计实验研究,旨在为艺术设计师拓展纹样设计方法,促进纹样艺术的传承与发展。优选Stable Diffusion和触手AI两种AI生成技术进行实验与比较,采用定性与定量相结合的分析方法对实验结果进行综合评价。实验结果表明,Stable Diffusion生成的纹样能较好地传承民族纹样的基因,艺术性与创造性兼具,符合民族纹样的艺术设计需求,但图像质量较低;触手AI生成的纹样创新性较好、图像质量高,但容易偏离原始纹样,不能满足艺术设计的内容需求。实验有助于生成式AI深度应用在民族纹样等传统纹样设计中,推动传统纹样的现代设计转化。

CBL联合比较教学法在非儿科麻醉专业医师儿科麻醉培训中的应用

目的 探讨案例教学法(Case-based Learning,CBL)联合比较教学法在非儿科麻醉专业医师儿科麻醉培训中的应用效果,以期提高教学质量。方法 将2021年3月1日至2023年2月28日于本院进修学习的38名综合医院麻醉医生作为研究对象,按在院学习时间分为对照组(n=16)和试验组(n=22),对照组采用传统教学法,试验组采用CBL联合比较教学法。采用测验成绩及调查问卷相结合的方式进行教学评价。结果 试验组学员理论知识成绩、病例分析成绩以及总成绩均优于对照组(P<0.05),试验组学员在增强记忆能力、容易激发学习兴趣、增强临床实用性、培养临床思维能力上选择“是”和对教学满意的占比均高于对照组(P<0.05)。结论 CBL联合比较教学法应用在非儿科麻醉专业医师的小儿麻醉教学中,不仅能提升课后成绩,而且能提高学员的临床综合能力,改善教学质量。

数字平台型企业网络效应影响因素的组态研究——基于模糊集定性比较分析方法

在消费者主导的数字浪潮下,网络效应已成为数字平台型企业扩大市场规模的关键点,依靠网络效应建立用户价值优势成为最核心的竞争策略。本研究在数字经济这一全新背景下,从网络效应视角出发,根据调查问卷获取的数据,运用模糊集定性比较法分析其多影响因素间的组态关系,深入挖掘其前因条件间的有效组合和匹配(即协同)。研究发现:市场定位和价格因素二者之间的协同是网络效应激发过程中的核心条件。技术因素和社交因素二者间的协同是网络效应扩大过程中的核心条件。平台治理和技术因素间的协同关系是网络效应迭代过程中的核心条件。在此基础上,本研究提出了“激发—扩大—迭代”三条增强数字平台型企业网络效应的实现路径,为数字平台企业综合竞争力的提升和可持续发展提供了科学的参考。

浅谈中国黄酒与日本清酒

中国黄酒是世界三大古酒之一,日本清酒的起源有赖于我国水稻种植、黄酒酿造技术的传入。黄酒和清酒都经历了漫长的发展时期,体现了所在国经济和文化的发展变迁。目前关于黄酒、清酒的相关研究较为分散,缺乏系统整理。本文对中国黄酒和日本清酒的历史沿革、分类方法进行了梳理,概述了二者在原料、工艺、成分、功效方面的研究情况,并提出对黄酒酿造和产业发展的建议,探讨中国黄酒发展可借鉴的方法与路径。