基于DDS的多通道高频大功率电源设计

介绍了一种4相位高频宽幅稳压电源，该电源主要用于生物芯片开发研究中产生旋转电场。4通道可调相位的高精度频率信号源由DDS发生，在标准50Ω负载下，通过二段放大实现100Hz-100MHz带宽50Vpp输出；通过引入幅度和相位检测负反馈，实现负载变化后稳定电源输出的幅度值和通道之间的相位差。     

液晶显示器的多极驱动方式

本文阐述了液晶显示器(LCD)的主要技术特性与驱动方法,重点论述了LCD的多极驱动方式,并结合一种以三极方式驱动LCD的单片4(1/2)位A/D转换器,讨论了三级驱动方式在该A/D转换器中的应用     

中速磨煤机制粉系统运行优化研究

针对某燃煤电厂中速磨煤机制粉系统冷风率偏高导致锅炉效率下降的问题,建立了中速磨煤机的热平衡计算模型。通过计算分析可知,煤中水分含量对磨煤机进出口温度影响较大,且煤中水分每增加1%,磨煤机入口热风温度相应增加约12℃。因此,在保证机组安全的前提下,通过降低冷风量来提高磨煤机出口温度即提高磨煤机入口热风温度,可以充分回收利用尾部烟气热量,提高锅炉热效率。该方法不需任何运行成本和设备投入,具有显著的经济效益。     

Dual‐Encoded Microbeads through a Host–Guest Structure: Enormous,Flexible, and Accurate Barcodes for Multiplexed Assays

Bead‐based suspension arrays have attracted increasing attention because of the fast growing requirements for high‐throughput multiplexed bioassays. Here, novel dual‐encoded microbeads (DEBs) based on a host–guest structure are developed. A strawberry‐like structure composed of thousands of dye‐doped nanoparticles closely packed onto the quantum dot‐encoded microbeads is designed and synthesized. Using this 3D structure, the encoded space is fully developed for multicolor encoding. As a result, a 30‐barcode library with an outstanding encoding capacity is successfully established and easily decoded via flow cytometry. The separation of organic dyes and quantum dots into two building blocks helps circumvent the optical mutual interference commonly observed in most multicolor barcodes, bringing great convenience for next‐step decoding accuracy. As a proof of concept, six typical DEBs are chosen and their feasibility in six‐plexed detection for influenza viruses is evaluated. The results show that DEBs can selectively capture the specific targets, with negligible nonspecific absorption; these results thus demonstrate the strong potential of the DEBs as a robust platform for multiplexed bioassays.     

The tri-emitting phosphate phosphors SrIn2(P2O7)2: Tm,Dy, Eu for ratiometric optical thermometer

Developing new phosphors used for ratiometric optical thermometers has attracted broad attention recently. According to the recent research, the phosphate SrIn₂(P₂O₇)₂ with regard to the structural rigidity has been adopted as the host of Tm and Dy activators behaving the super-stable white emission. Herein, Tm, Dy, Eu tri-doped phosphors were prepared to investigate the interaction of three different activators and their coupling sensitivity to temperature. Based on concentration control and energy transfer among three activators, the tunable emission, including the idea warm white, has been obtained. In the case of increasing temperature, the emission intensities of Dy³⁺ and Eu³⁺ partially decrease, whereas the Tm³⁺ fluorescence extremely keeps increasing to 155.4% of 473 K compared with that of room temperature. This phenomenon can be defined the negative thermal-quenching. It is believed that the back energy transfer (BET) from Dy³⁺ and that from Eu³⁺ to Tm³⁺ help the negative thermal-quenching of Tm³⁺ to a certain extent. Both cation occupation and structural rigidity obviously affect the BET efficiency. In the new phosphors, the fluorescence intensity ratios of Tm³⁺ and Eu³⁺ (blue/red) and (blue/orange) of Tm³⁺/Dy³⁺ are closely related to temperature and vary linearly over a wide temperature range, which can be regarded as an important index of temperature sensor. The SI_1.92P: T_0.01D_0.01E_0.06 shows excellent temperature sensitivity and recyclability. The current results show that SrIn₂(P₂O₇)₂: Tm, Dy, Eu phosphors can be regarded as candidate materials for optical thermometry.     

掺Y2O3磷酸盐隔热玻璃的制备及其性质的研究

以磷酸盐为主要原料,通过掺Y2O3制得了具有良好化学稳定性和可见光透过性的磷酸盐隔热玻璃.测定了玻璃的XRD、穆斯堡尔谱、IR光谱及可见-红外光谱,并对Y2O3改善磷酸盐玻璃的机制进行了合理的解释.     

生理无效腔对一次深呼吸氮清洗的影响

在Weible简化的数学模型基础上建立了一维数学模型下气体在肺中的传输和扩散方程。同时给出了在七层肺模型下气体传输核扩散的方程，考虑生理无效腔对呼吸氮清洗的影响，通过计算得到了一次深呼吸氮清洗的曲线，并与实验结果能够很好的吻合，并分析气重量无效腔对分析了呼吸无效腔对第Ⅲ、Ⅵ区域的影响。对进一步天空气体在肺内的传输和扩散和肺疾病的临床诊断有着重要的参考价值。     

以长江流指导积极推进治江事业新发展

为适应新形势新变化对治江事业发展提出的新要求,长江委积极践行可持续发展治水思路,启动并完成了长流规修编工作.论述了修编和实施长流规的重要意义;分析了新修编长流规的科学内涵;着眼于完善规划体系和科学调度、提高行政审批效率和社会服务质量、加强执法监督、创新体制机制和方法等方面,提出了推进长流规实施所必须的提升科技支撑能力、理服务能力、组织保障能力、经济发展能力等4个方面的保障措施.     

配电自动化系统工控安全风险分析

近年来,随着社会对供电质量要求的不断提高以及工控安全相关事件的频繁发生,如何保障可靠稳定的电力供给成为电力系统面临的主要难题。为保障供电可靠性、实现经济优质供电、提高电力系统的应急能力,配电自动化成为电力系统发展的必然趋势。其中,配电自动化系统作为配电自动化的核心,对其加强安全防护,已成为电力行业领域的热点和难点。对配电自动化系统展开风险分析,找出系统中存在的安全隐患,能够为管理员部署安全措施提供参考依据。     

基于抗差估计的灰色模型与时间序列组合模型及其在变形预测中的应用

文章讨论的方法是在时序分析建模的基础上,运用了GM(1,1)来提取趋势项,然后对残差进行时序建模,形成灰色与时序的组合模型,在建模中的参数估计方法,采用抗差估计来取代常规的最小二乘估计法,来达到抵抗粗差的目的,从实例计算来看,效果比较好。