基于ZigBee技术的电压采集系统的设计与实现

在智能低压电器的实际应用中,经常需要进行电压的采集,而有线采集的方法在某些场合中并不适用。提出基于ZigBee无线技术的电压采集系统的设计,利用STM32W无线射频ZigBee单片机作为主控制器,实现0～21V直流电压的采集。     

A method for estimating the gross primary production of alpine meadows using MODIS and climate data in China

The use of remotely sensed data to estimate and monitor the gross primary production (GPP) of an ecosystem on regional scales is an important method in climate change research. Under the unremitting efforts of scientists, many successful remote-sensing-based GPP models have been developed for various vegetation types and regions. However, in practice, some models have been applied to a wide variety of ecosystems, and the suitability of a particular model for the environment under consideration has seldom been taken into account. Due to ecosystem diversity and climatic and environmental variation, it is often difficult to find a model that is suitable for a specific vegetation region. In this article, a new method is proposed for estimating the GPP of alpine vegetation, known as the alpine vegetation model (AVM). The accuracy of the AVM in estimating the GPP was compared to that of four other models: the vegetation photosynthesis model (VPM), eddy covariance–light use efficiency (EC–LUE) model, temperature and greenness (TG) model, and vegetation index (VI) model. The results demonstrated that the AVM displays superior accuracy in estimating the GPP of alpine vegetation. We also found that there is information redundancy in the input variables of these four models, which may account for their lower accuracy in estimating the GPP. In addition, the GPP estimates using the enhanced vegetation index are affected more in the case of low rather than high GPP by the influence of senesced grass during the early and late grassland growing season.     

美海军舰艇编队协同作战能力CEC系统研究综述

协同作战能力 CEC 大大提高了美军的防空反导能力,本文对美海军舰艇编队协同作战能力 CEC 系统进行了综述：(1)描述了 CEC 系统的构成,阐述了 CEC 系统的工作原理和工作流程,给出了 CEC 条件下的舰艇编队协同作战的指挥控制网;(2)分析了 CEC 与 Link16/11、 GCCS 等数据链的关系,对比了三者之间的差异;(3)分析了 CEC 系统与“宙斯盾”作战系统的关系,对比了两者之间的差异。     

A “Missile‐Detonation” Strategy to Precisely Supply and Efficiently Amplify Cerenkov Radiation Energy for Cancer Theranostics

Cerenkov radiation (CR) from radionuclides can act as a built‐in light source for cancer theranostics, opening a new horizon in biomedical applications. However, considerably low tumor‐targeting efficiency of existing radionuclides and radionuclide‐based nanomedicines limits the efficacy of CR‐induced theranostics (CRIT). It remains a challenge to precisely and efficiently supply CR energy to the tumor site. Here, a “missile‐detonation” strategy is reported, in which a high dose of p‐SCN‐Bn‐deferoxamine‐porphyrin‐PEG nanocomplex (Df‐PPN) is first adminstered as a CR energy receiver/missile to passively target to tumor, and then a low dose of the ⁸⁹Zr‐labeled Df‐PPN is administrated as a CR energy donor/detonator, which can be visualized and quantified by Cerenkov energy transfer imaging, positron‐emission tomography, and fluorescence imaging. Based on homologous properties, the colocalization of Df‐PPN and ⁸⁹Zr‐Df‐PPN in the tumor site is maximized and efficient CR energy transfer is enabled, which maximizes the tumor‐targeted CRIT efficacy in an optimal spatiotemporal setting while also reducing adverse off‐target effects from CRIT. This precise and efficient CRIT strategy causes significant tumor vascular damage and inhibited tumor growth.     

微力电系统中多层膜的端部应力集中

微电子技术的发展对其本身及封装的结构可靠性提出了更高的要求，微机械的出现又使得微电子－机械元器件的电学行为和力学行为密不可分，从而扩展成为一个统一的微力电系统，微力电系统的强度问题主要是多层膜在制造和使用过程中，由于不同材料热学与力学参量的失配引起的残余热应力，特别是在界面和端部的应力集中，本文应用有限元方法分析了在不同的端部几何形状和组合形状下，多层膜中应力沿界的分布，对于微电子元件在成型过程中     

Simultaneous determination of some trace metal impurities in high-purity sodium tungstate using coprecipitation and inductively coupled plasma atomic emission spectrometry

A method based on the combination of coprecipitation with inductively coupled plasma atomic emission spectrometry (ICP-AES) was developed for the determination of impurities in high-purity sodium tungstate. Six elements(Co,Cu,Fe,Mn,Ni,and Pb) were coprecipitated by lanthanum hydroxide so as to be concentrated and separated from the tungsten matrix. Effects of some factors on the recoveries of the analytes and on the residual amount of sodium tungstate were investigated, and the optimum conditions for the coprecipitation were proposed. Matrix-matching calibration curve method was used for the analysis. It is shown that the elements mentioned above can be quantitatively recovered. The detection limits for Co, Cu, Fe, Mn, Ni, and Pb are 0.07, 0.4, 0.2, 0.1, 0.6, and 1.3 μg.g^-1, respectively. The recoveries vary from 92.5% to 108%, and the relative standard deviations (RSDs) are in the range of 3.1%-5.5%.     

基于D5000系统的电网事故预案推演系统设计

在研究D5000系统平台功能的基础上,阐述了电网事故预案编制体系,同时进一步设计和开发了一套基于D5000系统平台的电网事故预案推演系统,来保证事故处理的正常进行和安全校验。电网事故预案推演系统已在安庆调控中心上线使用,使用情况表明,该系统提高了安庆电网的调度水平,为其可靠、安全和经济运行提供了保障。     

某型位标器重力漂移测试方法研究

本文基于某型位标器漂移产生的原理建立测量模型。在此模型的基础上,通过公式计算产品的重力漂移指标,并在实际生产中加以应用。     

大规模多分辨率地形模型简化生成方法

针对地形的四叉树简化技术,提出一个简单的裂缝消除算法．该算法不使用递归同样可以使四叉树满足约束条件,简化结果不存在T型连接．利用该算法实现了地形数据的实时显示,并提出了今后的改进思路．     

油烟机油网技术分析与探讨

吸油烟机油网的油烟分离功能是影响吸油烟机排油烟效果的重要因素,并对日后的清洗是否方便、风机的使用寿命起决定性作用.本文通过对油网的技术分析,探讨各大品牌吸油烟机在油烟分离方面取得的成效,并指出今后吸油烟机发展方向.