Theoretical and numerical analysis of coal dust separated by centrifugal force for working and heading faces

In order to meet engineering needs of Chinese underground coal mines,a new dust-collecting fan,a device of dust separated by centrifugal force in driven cyclone passageway(DCCP)was designed.In centrifugal dust removal section(CDRS)of DCCP,a general equation is derived from the principle of force equilibrium.According to CDRS structure parameters and fan running parameters,the general equation is simplified,and the simplest equation is calculated numerically by MATLAB.The calculation results illustrate that increasing quantity of air current is against dust removal,but it is beneficial to dust removal by increasing the radius of driven spiral blade and increasing the particle diameter of coal dust.The conclusions show that the dust-collecting structure parameters coupled with the fan running parameters is a novel optimization approach to dust-collection fan for working and heading faces,which is especially suitable for Chinese underground mines.

The Effects of Work Ethics, Transformational and Transactional Leadership on Work Performance of Teachers

Teacher performance is an important factor to improve education performance. This study aimed to analyze the effect of the work ethics, transformational, and transactional leadership style on teacher performance. The experiment was conducted in public high school No. 112 Jakarta. A total of 50 teachers were included as samples, where they were given the questionnaires to be filled by self-rating. Data were analyzed with multiple linear regression model and processed with SPSS version 20. Results showed that transformational leadership, transactional leadership and work ethics have positive and significant impacts on teacher performance both simultaneously and individually.

Relationship on the Head Deviation Rate and Laying Length of Porous Tubes

To improve the utilization efficiency of water the laying length of porous tubes was analyzed. Considering long porous tubes the irrigation uniformity of porous tubes was studied by analyzing the deviation rate of the working head of porous tubes and through an impact analysis of the deviation ratio of flow rate based on laying length slope pressure head and perforation spacing. Results showed that the deviation ratio of the flow rate could be reduced by decreasing the length of tubes and increasing the slope. The deviation ratio of flow rate was less influenced by pressure head and perforation spacing. A best laid slope resulted in a longer laying length of the porous tubes and they were not constant.

Research on the dynamic response of connecting rod bearing bush wear of reciprocating machine under variable working conditions

As a type of reciprocating machine, the reciprocating compressor has a compact structure and many excitation sources.Once the small end bearing of the connecting rod is worn, it is easy to cause the sintering of the bearing and the abnormal vibration of the body.Based on the characteristics of poor lubrication state and complex force of connecting rod small head bearing, a mixed lubrication model considering oil groove feed was established, and the dynamic simulation of the reciprocating compressor model with lubricated bearings was carried out;considering different speeds and gas load conditions, the law of the impact of the eigenvalues changing with working conditions was explored.The fault simulation experiment was carried out by selecting representative working conditions, which verified the correctness of the simulation method.The study found that two contact collisions between the pin and the bearing bush occurred in one cycle, the collision impact was more severe under the wear fault, and the existence of the gap made the dynamic response more sensitive to the change of working conditions.This research provides ideas for the location and feature extraction of fault symptom signal angular segments in the process of complex measured signal processing.

Why Did the Reform Fail?The Impact of the Personnel System Reform on Teachers in Jia County of China

Over recent years,the reform-driven development of education has been one primary idea of the Chinese government under the leadership of Xi Jinping.Above all,the reform of the personnel system,closely related to the interests of teachers,becomes the most sensitive link in the educational reform.To root out the restriction of education system on teachers and enhance their enthusiasm for work,Jia County carried out a reform of teacher personnel system from 2013 to 2016,including breaking the hierarchical restriction on teachers’administrative promotion,decentralizing the power of confirming the teachers’professional titles,eliminating the teachers with the worst performances,practicing performance salary,and other measures.In this study,we tracked 627 teachers regarding their work enthusiasm and stress during the three-year reform,analyzed the data through the Hierarchical Linear Model(HLM),and found that:(1)The teachers’enthusiasm for work increased over time,but did not significantly change with the consideration of the influence of the principals’leadership in teaching.The personnel system reform aiming at motivating teachers failed to work as expected.(2)The teachers’work stress still increased year by year.Therefore,this study concludes that the reform in Jia County failed to fulfill its goals and that the vigorous top-down reform did not lead to ideal results.A reason might be that the reform damaged the vested interests of teachers who represent the deep-rooted nepotism typically in the Chinese education community.Reforms of educational personnel system should give schools a full play regarding educational governance in the future.

Relationship Between Work Stress and Mental Health of Middle School Teachers in Guangzhou

This study mainly discusses the relationship between middle school teachers’mental health and work stress in Guangzhou.This study uses questionnaire survey method to examine 237 teachers in Guangzhou,and adopts SPSS26.0 to conduct independent sample t-test,ANOVA,correlation analysis,and regression analysis to draw the conclusion.The results show that:(1)The work pressure of middle school teachers in Guangzhou is above the medium level,and their mental health is at the middle level.(2)Under the influence of different gender,position,age,teaching years,and teaching objects,the pressure of middle school teachers is different.(3)There is a significant positive correlation between teachers’work stress and the dimensions of self-confidence loss and social dysfunction of mental health.(4)Work stress can effectively predict the level of mental health.Therefore,we need to understand the pressure sources of middle school teachers to develop measures to alleviate the pressure of teachers and improve the mental health of middle school teachers.

UAV-assisted data collection for wireless sensor networks with dynamic working modes

Wireless Sensor Network(WSN)is a cornerstone of Internet of Things(IoT)and has rich application scenarios.In this work,we consider a heterogeneous WSN whose sensor nodes have a diversity in their Residual Energy(RE).In this work,to protect the sensor nodes with low RE,we investigate dynamic working modes for sensor nodes which are determined by their RE and an introduced energy threshold.Besides,we employ an Unmanned Aerial Vehicle(UAV)to collect the stored data from the heterogeneous WSN.We aim to jointly optimize the cluster head selection,energy threshold and sensor nodes’working mode to minimize the weighted sum of energy con-sumption from the WSN and UAV,subject to the data collection rate constraint.To this end,we propose an efficient search method to search for an optimal energy threshold,and develop a penalty-based successive convex approximation algorithm to select the cluster heads.Then we present a low-complexity iterative approach to solve the joint optimization problem and discuss the implementation procedure.Numerical results justify that our proposed approach is able to reduce the energy consumption of the sensor nodes with low RE significantly and also saves energy for the whole WSN.

Teacher's Role in Students'Group Work in College English Classroom

The implementation of group work in China is aroused by the teaching reform and proposal of the New Curriculum Standard, in order to improve the language teaching and learning. However, in many cases group work is far less effective and desirable than it should have been. The effectiveness of group work depends on many factors in real language classroom setting. This paper mainly focuses on the factor of teacher's role. The main implication of this paper is to suggest the appropriate teacher role in students'group work and put forward some skills in organizing group work in order to make group work more effective and significant.

My Brother

My brother is an English teacher.He works in No.4 Middle School in Fucheng,Hebei. I don't know much about his work.He is very busy every day and usually works five days every week,from Monday to Friday.But sometimes he has to work at weekends.He always gets up early to make-breakfast for my family.He goes to work by bus at 7:00 a.m.He has lunch in his school.My brother likes sports and sometimes he plays basketball at noon. He gets home at about 6:00 in the afternoon.After dinner,he usually helps me with my homework for about an hour.Then he watches TV for half an hour.After that he goes to bed.

Analysis of influencing factors on suction capacity in seabed natural gas hydrate by cutter-suction exploitation

The mathematical and simulation models of working head in the deep-sea working environment were built to analyze the effects of cutter-suction flow,cutter-head rotating speed,cutting depth and suction port position on the cutter-suction capacity.The efficiency of the cutter-suction is analyzed based on the analysis of the variation law of the solid-phase volume fraction of the flow field,the variation law of the velocity distribution in the flow field and the distribution law of the solid-phase concentration.The results show that the increase of cutter-suction flow can significantly improve the cutter-suction efficiency when it is less than1000m3/h.However,when it is more than1000m3/h,it is helpless.When the cutter-head rotate speed is within the range of10–25r/min,the cutter-suction efficiency stabilizes at about95%.While the speed is greater than25r/min,the cutter-suction efficiency decreases sharply with the increase of cutter-head rotate speed.With the increase of cutting depth,the cutter-suction efficiency first increases and then remains stable and finally decreases.The cutter-suction efficiency remains at about94%when the suction port position deviation ranges from0°to30°,but it has a sharply reduction when the deviation angle is more than30°.

Problems about Design of Dyke Reinforcement

The dyke experiences very high flood level more and more frequently. The timely issued " The Standard of Dyke Design" has played an important role in the design, measure feasibility study and examination of dyke reinforcement. Safety appraisal is required before dyke reinforcement design. But, the conducted item is safety demonstration in the process of dyke reinforcement design at present. This paper suggests that at least 8 aspects should be considered in safety demonstration. The effective water head is considered as the most important factor for dyke safety and reinforcement design. Seepage control measure design is an important part of dyke reinforcement design. Its correct train of thought is discussed in this paper. Some other factors for dyke reinforcement design are also pointed out.

Transition from Textbook to Classroom Instruction in Mathematics:The Case of an Expert Chinese Teacher

This study reports how an expert Chinese teacher implements mathematics textbook lessons in enacted instruction.Our video analysis indicates that both textbook and enacted teaching included only one worked example;however,the teacher engaged students in unpacking the example in great depth.Both the textbook and the enacted teaching showed“concreteness fading”in students’use of representations.However,the Chinese teacher incorporated students’self-generated representations and facilitated students’active modeling of quantitative relationships.Finally,the Chinese teacher asked a greater number of deep questions than were suggested by the textbook.These deep questions often occurred as clusters of follow-up questions that were either concept-specific or promoted comparisons which facilitated connection-making between multiple representations and solutions.

班主任任职意愿及其影响因素:基于心理感受与工作嵌入视角的综合分析

吸引优秀教师担任班主任是当前中小学教师队伍建设中的重要议题。通过对北京市A区1567名中小学教师的调查发现:教师的班主任任职意愿偏低,58.9%的教师不愿意担任班主任;相对而言,城镇教师、低学历教师、高职称教师以及高中教师等亚群体的班主任任职意愿更低;影响班主任任职意愿的因素复杂多样,职业承诺、匹配和牺牲具有显著的正向预测效应,其夏普利分解值贡献率居于前三位。要提高教师的班主任任职意愿,可考虑采取如下举措:加强班主任人力资源开发,优先关注重点人群;改善班主任工作设计,提高班主任岗位本身的吸引力;进一步推动绩效工资改革,加大向班主任的倾斜力度。

新时代高校教师党支部在课程思政中发挥作用的机制研究

课程思政是高校思政育人的重要途径,是实现高校立德树人根本任务的重要环节。但在课程思政建设过程中,仍然存在一定的问题和困难,主要体现在广大任课教师群体上。教师党支部是新时代高校的基层组织,具有引领和推动课程思政高质量建设的责任。首先,分析高校开展课程思政的问题和苦难;其次,分析党支部在引领和推进课程思政建设中应发挥的作用;最后,根据教师党支部和课程思政建设的实际情况,提出“以学促建”“以带促建”“以评促建”和“以查促建”四种教师党支部发挥作用的机制,真正实现党支部引领和推动课程思政的建设和发展。

学科多元化班主任团队建设的困境及实践路径

班主任是班级工作的组织者和指导者,在学校教育和班级管理中占有举足轻重的地位。建设学科多元化班主任团队有利于提升班主任的综合育人能力,促进学生全面发展;发挥个人优势,促进特色班集体发展;帮助班主任自我反思,促进个体和群体的专业化发展。但现阶段,班主任团队存在目标不清晰、专业能力不足、合作不充分的困境。为解决这些困境,建设学科多元化班主任团队应明确班主任团队共同目标,规范团队的组织管理;健全班主任培养体系,促进班主任团队专业发展;营造多学科协作文化,加强班主任团队交流合作。

党建引领与学科建设深度融合的高校“双一流”教师基层党支部创新模式探讨

高校党建工作与学科建设融合是指将党的建设工作与高校的学科、教学、科研、管理等相结合,实现党建工作与高校发展的有机统一。依托全国高校党建样板支部建设,以教育强国、科技强国、交通强国为指引,打造支部党建工作品牌。由此形成了一条适合自身学科特色、教师支部特点、高校党建特征的党建工作与学科建设深度融合的“党建+学科、教学、科研、社会服务”的发展之路。以党建工作为引领,促进一流学科建设,带动教师队伍发展,奠定了为党育人、为国育才的教师队伍基础。

园长家园矛盾适应性领导力水平的现状研究

矛盾与合作相伴相生,作为公共关系危机的一种表现,家园矛盾会严重阻碍家园共育关系的维系与发展,而园长的适应性领导力对于化解家园矛盾十分重要。本研究自编信效度检验良好的问卷,采用随机分层抽样法,对山东、河南、山西、辽宁等地区的650名园长进行调查。研究结果表明:园长家园矛盾适应性领导力的总体水平较高,但不均衡;其在年龄、职位、学历等不同人口学变量上存在差异。基于此,提出养成“安”与“危”共生的内省发展观、树立“人”与“事”并重的科学处置观、坚持“情”与“理”相融的家园沟通观的建议。

高校教师党支部党建引领“三全育人”实施路径探索

高校党建工作与思想政治工作是实现立德树人任务的重要内容和重要途径,但党建与业务工作、思想工作的融合是一个难点问题。高校教工党支部作为高校基层党组织联系广大教职工和师生的纽带和桥梁,在党的教育事业中发挥着重要作用。支部党员教师的双重身份要求其既承担党建与业务工作,又肩负学生思想政治教育责任。该文从立德树人根本任务出发,结合当代大学生的特点和新时代党建要求,挖掘教师党支部在“三全育人”中的党建引领不足,探索构建协同育人机制,发挥教师党支部的“三全育人”功能,服务高校学科建设、人才培养工作。