Simulation study on radiative imaging of combustion flame in furnace

Radiative imaging of combustion flame in furnace of power plant plays an increasingly important role in combustion diagnosis. This paper presents a new method for calculating the radiative imaging of three-dimensional (3D) combustion flame based on Monte Carlo method and optical lens imaging. Numerical simulation case was used in this study. Radiative images were calculated and images obtained can not only present the energy distribution on the charge-coupled device (CCD) camera target plane but also reflect the energy distribution condition in the simulation furnace. Finally the relationships between volume ele- ments and energy shares were also discussed.     

浅论网络环境下高校图书馆信息服务发展的趋势

网络信息服务是现代信息服务的高级形式,它彻底改变了图书馆的管理理念,高校图书馆不再仅仅是网络信息资源的利用者,还是网络信息产品的生产者和提供者。本文通过对图书馆信息发展的研究探讨其发展趋势。     

Study on the comprehensive combustion kinetics of MSW

The combustion behavior of typical components of MSW was examined with a thermal gravimetric analyzer (TGA). The experiments were done over the temperature range of room temperature to 1000℃ at a heating rate of 10 oC/min and in an oxidizing atmosphere. The results indicated that the entire weight loss process of each typical component of MSW consists of one to three distinct combustion stages. The combustion of typical components of MSW could be modeled by one to three independent reactions. The corresponding parameters of typical components of MSW such as activation energy, pre-exponential factor, and reaction order were determined. The calculated results using the comprehensive kinetic model composed of one to three independent and consecutive reactions, agreed well with experimental results.     

强化选题组稿打造精品期刊

为打造精品期刊,<北京大学学报(医学版)>重视选题组稿,依托北京大学及其附属医院的学科优势和临床优势,依靠编委精心策划重点专题,创办了<学科交叉><疑难/罕见病例分析>等富有特色的新栏目.     

分布式异构教学资源库管理系统的设计

在教育信息化的推进过程中,形成了很多具有特色的教学资源库,在教学变革中产生了很好的效益,但如何使这些教学资源库实现共享却成了教育信息化的一个"瓶颈".为了突破这个"瓶颈",广东省佛山市创新技术策略,建成了分布式异构教学资源库管理系统,实现了跨区域教学资源库的共建共享,形成了教学资源"统一检索,资源分布建设与存储"的地方特色,突破了教学资源共建共享的困局.本文即对这种资源共享形式进行了详细的介绍,重点论述了整个系统的体系结构及工作流程.     

高校勤工助学途径和功能的有效拓展

目前大部分高校勤工助学模式过于单一,岗位"僧多粥少",难以满足众多经济困难学生的需求.妥善解决高校经济困难学生问题的有效模式应该是多样化的,把经济资助与学生的教育与发展相结合.     

Teaching for developmental growth: learning partnerships and student development in graduate education in China

Teaching and learning in higher education can integrate and accomplish student developmental goals in addition to promoting student learning of subject matter knowledge and transferrable skills. Drawn from the theoretical concept of self-authorship, the Learning Partnerships Model was implemented in teaching a graduate-level course on social research methodology. This paper describes the conceptualization and implementation of the developmentally attuned course, and reports a qualitative study that examined student development as its result. Qualitative data were collected from five cohorts of course participants, in the forms of reflective essays, student interviews, and the instructor’s teaching journal. Seven themes were identified that reflected student development throughout the course. The seven themes fall into three dimensions of epistemological, intrapersonal, and interpersonal development that are interconnected, and the epistemological dimension stands out as a strong partner among the three. These findings may help university faculty understand and integrate student development into their teaching practices.     

A 3D numerical simulation of laser-induced incandescence of soot particles in coal combustion products

Laser-induced incandescence （LII） has received increasing attention as a potentially powerful technique for in-situ measuring of the volume fraction and primary size of soot particles in combustion systems. In this study, a 3D Monte Carlo simulation combined with a Mie equation was developed to analyze the influence of spectral absorption and scattering on the measured LII flux emitted by soot particles. This paper represents a first attempt to analyze soot measurement using the LII technique in coal combustion products. The combustion products of gases （CO2, N2）, soot, and fly-ash particles, present between the location of laser-excited soot and the LII flux receiver. The simulation results indicated that an almost Beer-Lambert exponential decrease in LII flux occurred with an increase in the volume fraction of soot particles, while a nearly linear decrease occurred with an increase in the volume fraction of fly-ash particles. The results also showed that scattering effects of both soot and fly-ash particles on the LII flux could be neglected. Compared with the absorption of gases, a decrease of 20% of LII flux was observed with soot particles, and a decrease of 10% with fly-ash particles.     

整枝技术在潍县萝卜种子生产上的应用效果研究

研究了不同整枝方式对潍县萝卜的种子产量影响。结果表明,种株主茎摘心不能显著增加一级分枝的数量,但却能显著增加二级分枝的数量,增加结荚数,提高种子产量。开花末期将各级侧枝摘心,能够增加有效结荚数,提高种子千粒重,进而提高产量。     

对莆田滨海体育休闲旅游开发的认识与思考

通过调查分析莆田滨海体育休闲旅游的资源状况以及开发与发展具有的优势和特色,探讨滨海体育休闲旅游产品的概念与特征,从实现莆田滨海体育休闲旅游可持续开发和促进旅游经济发展的战略高度,对莆田滨海体育休闲旅游开发的总体目标和市场定位以及莆田滨海体育休闲旅游产品开发的基本思路、可持续开发与发展的对策进行初步的研究,提出了建设性的创意和建议.