新型塑料薄膜拉膜机构的设计

为解决传统拉膜机构结构复杂、难以控制、膜尺寸准确性低等问题,设计了一种新型薄膜包装机的拉膜机构,该机构以电机为动力,采用单片机作为电控元件,应用光栅盘测量拉放膜长度,通过控制电机的正转和反转,从而达到拉膜和放膜的目的.样机经过了实验测试,结果表明：该机构结构性能稳定,误差率小,膜张力易于调节.     

牦牛隐性乳房炎主要病原菌及耐药和毒力基因分布情况

为探明牦牛隐性乳房炎（SCM）主要病原菌及其耐药和毒力基因的分布情况，本研究自甘肃省甘南州夏季牧场收集无乳房炎临床症状牦牛乳样，通过兰州乳房炎试验（LMT）筛选SCM乳样，从中分离病原菌并纯化培养，利用16S rDNA鉴定主要病原菌，通过纸片扩散法判定其药物敏感性，并采用PCR方法对相关耐药及毒力基因进行检测。结果显示，共筛选出牦牛SCM乳样324份，检出率14.43%；主要病原菌为葡萄球菌属、埃希氏菌属和肠球菌属，其中葡萄球菌分离株对青霉素和四环素耐药率最高，分别为59.57%和47.52%；大肠埃希氏菌分离株对四环素和氨苄西林耐药率最高，分别为43.40%和20.75%；粪肠球菌分离株对四环素和红霉素耐药率最高，分别为25.00%和16.67%；59株耐青霉素金黄色葡萄球菌中共检出MRSA 12株，其中7株携带mecA基因，5株含mecC基因；四环素外排泵基因tetK、tetA携带率最高（85.45%、56.36%），核糖体保护基因tetM携带率最低（34.55%）；毒力基因中，clfA、clfB、fib、coa基因检出率较高（87.64%、84.27%、83.15%、82.02%）。研究表明，牦牛SCM的主要病原菌为金黄色葡萄球菌和大肠埃希氏菌，均对青霉素类和四环素类抗生素耐药性较高，其中金黄色葡萄球菌的主要毒力因子为黏附因子和凝固酶。     

基于PTR2000无线Model的单片机之间无线通信的实现

由一种具体无线射频Model-PTR2000构成的单片机之间的无线射频通信系统,给出了必要的主要硬件电路组成,讨论了通讯软件设计和实现方法。由此可构成无线射频通信技术的基础,为实现各种不同具体要求单片机之间的通讯,提供了一种新的方法。     

SCM of Manufacturing Enterprise Driven by Order Form

To provide various production for fulfilling the customer's requirements to the market has been the goal of manufacturing enterprises. The order form is the representation of customer's requirements. It has been the headstream and end-piont of the management of enterprises and SCM. The idea and it's realization of SCM to the whole process are introduced, that is driven by the order form. It's derived from several aspects, including the characteristics of the production's configuration, the type of order form and supplying, the manufacture organizing mode and the material requirements, the way of SCM in manufacturing enterprise and the model of SCM to the whole process driven by order form, realizing technique, etc.     

基于预报模型的井灌控制系统研究

系统由控制子站、通讯系统和基于地下水资源预报模型的控制软件包组成。控制子站以单片机为核心，结合遥控遥测技术和通讯技术，完成井群的现场控制；控制软件包结合数学模型，根据预报结果和灌溉计划，对灌溉过程进行控制和管理。系统具有功能强、成本低、操作简单的特点。     

农机机组后视障碍智能测距装置

文中采用TR40—16型超声波传感器和AT89C2051单片机研制了农机机组后视障碍测距系统，并陈述了测距原理，给出了相关测距电路及软件设计框图，其测距范围为0．13～10m，可满足机组后视障碍测距的要求。     

Competitive Scavenging of Trace Metals by HFO and HMO during Redox-driven Early Diagenesis of Ferromanganese Nodules (11 pp)

-  Dedicated to Prof. Dr. Ulrich Förstner on his 65th birthdayBackground   Surface complexation models (SCM) alone have yet less successfully reproduced sorption isotherms of hydrous manganese oxides (HMO). This is in part due to the fact that the HMO structure may vary with pH, and also because microbially formed natural HMO has an oxidation number O/Mn 〈 2, i.e. is of non-stoichiometrical composition. The former effect has often led to severe artefacts, such as an under-prediction of metal sequestration at low pH, and non-comparable pK and pHZPC values in literature. The latter effect is of particular importance for environments of varying redox conditions like sediments.Objectives   We propose therefore a new sorption model comprising of amphoteric site SCM, ion exchange due to permanent charge compensation, and solid solution formation, in order to comply at least in part with the redox complexity of HMO phases of stable birnessite- and buserite-type structures. Methods   The model is run by a new Gibbs energy minimization code which is shown to be particularly suitable for such a sorption continuum approach. Results and Discussion   Initial calibration of the model was performed by experimental literature data on simple laboratory systems. Thus parameterised, we simulated on the basis of available field data the effect of redox-driven dissolution of a ferromanganese nodule on the partitioning of metals between the interacting HMO, HFO, and marine water phases. Our scenario model suggests that significant fraction of Mn and other metals, probably 50% or more, may be recycled to water column from the surface of the ferromanganese nodule upon gradual development of the bottom water stagnation, except of Zn for which a by far stronger net retention was found.Conclusion and Outlook   Our model, even if only a first approximation, clearly shows that stagnation in the marine bottom water, once occurring, can drastically change primary element proxy records in ferromanganese nodules, smoothing out any anomalous patterns in the most recent record.     

单片机技术在智能家具中的应用与发展

阐述单片机的概念、产生和发展的过程,同时结合其体积小、寿命长、功耗低、可靠性好和性价比高等特点,论述单片机在日常生活中各个领域的应用以及给我们生活带来的便捷性、经济性和安全性,进而分析得出其应用于智能家具领域的可行性。通过介绍近些年单片机在智能家居和家具领域的快速发展和广泛应用,分析从中暴露出来的缺陷和问题,有针对性的提出相应的解决方案,同时指出其未来的发展趋势。     

一种厨卫智能控制系统的研制

为了更好的迎合人们日益增长的物质文化需求,设计了一种基于有线电话网络和无线遥控的厨卫智能控制系统。试验证明:该系统充分利用现有资源,提高了厨卫的安全使用性能,操作简单、方便,使用成本低廉,具有良好的市场前景,值得推广应用。