集体备课的现状及对策

在学校办学规模扩大；教师人数普遍增加的情况下，如何提高教师的整体素质，是每个学校的领导普遍关心的问题．集体备课无疑是促进教师提高，实行校本培训的重要环节。学校的初衷是要加强教师之间的责任，以老带新，互相促进，发挥集体智慧，实现资源共享．可是集体备课的质量如何?据我所知，很多学校采取规定时间，规定地点集中备课的方法，甚至每周必须保证有一个晚上集体备课时间，形式上轰轰烈烈，而实际上走过场、消耗时间，虽然有了统一教案，可是从教学实际来看，没有多少人按照集体备课规定的统一教案去实施教学，     

HARD DISK DRIVES CONTROL IN MOBILE APPLICATIONS

In this paper, control design is investigated for hard disk drives in mobile applications with unknown external arbitrarily fast time-varying disturbances. The disturbances can be estimated with exponential accuracy using the proposed disturbance observer based on a series of integral filters. The position error signal will converge to zero with the proposed control technique for systems subjected to the unknown disturbances. The effectiveness of the proposed method is demonstrated by extensive simulation studies.     

Bending behaviors of large diameter thin-walled CP-Ti tube in rotary draw bending

The rotary draw bending(RDB) of large diameter thin-walled(LDTW) tube needs the strict cooperation of multiple processing parameters to avoid possible multiple defects.Due to the specific properties,the bending behaviors of LDTW commercial pure titanium(CP-Ti) tube are much more complex to achieve precise deformation.With the CP-Ti tube of 50.8 mm(out diameter, D)×0.508 mm(wall thickness,t)×101.6 mm(bending radius,R) as a representative component,the bending behaviors of LDTW CP-Ti tube under different p...     

图书馆自动化业务流程及金盘集成管理系统问题浅析

以贵州财经学院图书馆为例,系统地介绍了图书馆各部门利用金盘集成管理系统开展自动化业务的工作流程,分析了金盘图书馆管理系统在应用过程中遇到的问题,提出了改进金盘系统管理软件的建议。     

不同油藏区块注水系统能耗指标体系的构建

针对目前油田注水系统缺少地下系统能耗评价指标,且地上系统能耗指标不完善的问题,从不同油藏类型、区块注水效果角度提出了注水地下系统的能耗评价指标。研究了主要的储层参数——渗透率、孔隙度、饱和压力、地层水矿化度等与地面注水系统重要参数标准单耗的关系,综合了地面注水和油藏注水与采收效果评价体系,以注水能耗替代注水量,实现油田开采效益最大化;新增了站效、管网能量利用率为注水地上系统的能耗标杆指标。从而建立了完整的地上地下注水系统的评价指标体系,综合评价了整个注水系统的能耗现状。为衡量注水系统能耗状态提供了具体完整的标杆指标。     

Molecular structure and biological function of proliferating cell nuclear antigen

Proliferating cell nuclear antigen (PCNA) is the core component of replication complex in eukaryote. As a processive factor of DNA polymerase delta, PCNA coordinates the replication process by interacting with various replication proteins. PCNA appears to play an essential role in many cell events, such as DNA damage repair, cell cycle regulation, and apoptosis, through the coordination or organization of different partners. PCNA is an essential factor in cell proliferation, and has clinical significance in tumor research. In this article we review the functional structure of PCNA, which acts as a function switch in different cell events.     

Progress in phototaxis mechanism research and micromanipulation techniques of algae cells

Phototactic movement is a characteristic of some microorganisms' response to light environment. Most of the algae have dramatically phototactic responses, underlying the complicated biological, physical and photochemical mechanisms are involved. With the development of the micro/nano and sensor techniques, great progress has been made in the research of the algae phototaxis. This review article summarizes the progress made in the research on the functional phototactic structures, the mechanisms of photo-response process and photodynamics of phototaxis in algae, and describes the latest developed micro-tracking technique and micromanipulation technique. Moreover, based on our own research results, the potential correlation between the phototaxis and photosynthesis is discussed, and the directions for future research of the phototactic mechanism are proposed.     

Decision feedback equalizer based on non-singleton fuzzy regular neural networks

1. INTRODUCTION Badly nonlinear distortion often occurs in high-speed wireless digital transmission systems, which calls for an adaptive nonlinear equalizer capable of counteracti- ng deep fading. There are two types of nonlinear equalizers: maximum-likelihood sequence equalizer (MLSE) and decision-feedback equalizer (DFE). Bec- ause of intense computation and enormous storage, MLSE isn’t suitable for application. DFE is widely used due to its simple structure, but the forward and f…     

Structural properties of residual carbon in coal gasification fine slag and their influence on flotation separation and resource utilization: A review

Coal gasification fine slag (FS) is a typical solid waste generated in coal gasification. Its current disposal methods of stockpiling and landfilling have caused serious soil and ecological hazards. Separation recovery and the high-value utilization of residual carbon(RC) in FS are the keys to realizing the win-win situation of the coal chemical industry in terms of economic and environmental benefits.The structural properties, such as pore, surface functional group, and microcrystalline structu...