磷酸亚铁锂的水热合成及其石墨烯掺杂改性

以FeSO4(7H2O、H3PO4和LiOH(H2O为原料,采用水热法合成了纯相、结晶度高的磷酸亚铁锂,使用XRD、SEM和TEM技术表征了样品。结果表明:反应温度为180～190℃、反应时间为3～5h时可以得到分散性好、粒径为2～4μm的磷酸亚铁锂粉体。采用一步法和两步法对磷酸亚铁锂进行石墨烯掺杂改性,两步法优于一步法,两步法是将自制的磷酸亚铁锂粉体、氧化石墨粉体和水合肼按比例混合在一起,经100℃油浴加热24h即可得到石墨烯掺杂改性磷酸铁亚锂的复合材料,此材料仍然具有橄榄石型晶体结构,结晶度好且无杂质生成。     

Atom devices based on single dopants in silicon nanostructures

Silicon field-effect transistors have now reached gate lengths of only a few tens of nanometers, containing a countable number of dopants in the channel. Such technological trend brought us to a research stage on devices working with one or a few dopant atoms. In this work, we review our most recent studies on key atom devices with fundamental structures of silicon-on-insulator MOSFETs, such as single-dopant transistors, preliminary memory devices, single-electron turnstile devices and photonic devices, in which electron tunneling mediated by single dopant atoms is the essential transport mechanism. Furthermore, observation of individual dopant potential in the channel by Kelvin probe force microscopy is also presented. These results may pave the way for the development of a new device technology, i.e., single-dopant atom electronics.     

Effects of ball-milled graphite in the synthesis of SnO2/graphite as an active material in lithium ion batteries

Nano-sized SnO₂ particles supported on ball-milled graphite were manufactured by the in situ NaBH₄ reduction method and were used as an anode active material in lithium-ion batteries. Their physical and electrochemical characteristics were investigated using various characterization techniques: Raman spectroscopy, x-ray diffraction (XRD), transmission electron microscopy (TEM), and cyclic voltammetry (CV). From coin half-cell tests, the SnO₂ particles supported on graphite that was ball-milled for 24 hr showed a reversible capacity better than that of commercial graphite and other SnO₂/graphite materials for which the graphite was ball-milled for longer lengths of time.     

Effects of alkali-metal carbonates and nitrates on the CO<Subscript>2</Subscript> sorption and regeneration of MgO-based sorbents at intermediate temperatures

The effects of alkali-metal carbonates and nitrates on the CO₂ sorption and regeneration of MgO-based sorbents were investigated in the presence of 10 vol% CO₂ and 10 vol% H₂O in an intermediate temperature range, 300 to 450 °C. The CO₂ capture capacities of the MgO-based sorbents promoted with Na₂CO₃ and K₂CO₃ were 9.7 and 45.0 mg CO₂/g sorbent, respectively. On the other hand, a MgO-based sorbent promoted with both Na₂CO₃ and NaNO₃ exhibited the highest CO₂ capture capacity of 97.4mg CO₂/g sorbent at 200 °C in 10 vol% CO₂, which was almost ten-times greater than that of the MgO-based sorbent promoted with Na₂CO₃. The CO₂ sorption rate of these sorbents was higher than that of the MgO-based sorbents promoted with alkali-metal nitrates due to the formation of Na₂Mg(CO₃)₂ or K₂Mg(CO₃)₂ by the alkali-metal carbonate and the eutectic reaction of the alkali-metal nitrates. In addition, the reproducibility problem of double-salt sorbents obtained by the precipitation method was completely resolved by impregnating MgO with alkali-metal carbonates and nitrates. Furthermore, we found that their desorption temperatures are lower than those of the MgO-based sorbents promoted with alkali-metal carbonates due to the eutectic reaction during the regeneration process.     

基于MAS的电网新设备启动方案智能编制系统的设计与实现

电网的快速发展使得新设备投运工作量日益增大。现有运行方式人员手工编制启动方案的模式效率低,安全风险难以管控,无法满足电网运维精益化的要求。通过分析新设备投运操作的技术特点和启动方案编制流程的实际需要,建立了基于多智能体技术的电网新设备启动方案编制模型。该模型强调了数据源端免维护、启动方案编制的智能性、通用性、易维护和界面友好等特点,突出了模型中人机交互Agent的功能和各个智能体间的协调控制策略。最后以D5000平台为数据源,结合B/S模式,采用VC#语言开发出基于该模型的实际系统,充分提高新设备启动方案编制的智能化水平,满足多部门流转会签的使用需求,实现对新设备投运工作风险的管控。     

Characterization of proteolysis in muscle tissues of sea cucumber <Emphasis Type="Italic">Stichopus japonicus</Emphasis>

The proteolysis in muscle tissues of sea cucumber Stichopus japonicus (sjMTs) was characterized. The proteins from sjMTs were primarily myosin heavy chains (MHCs), paramyosin (Pm), and actin (Ac) having a molecular mass of approximately 200, 98, and 42 kDa, respectively. Based on SDS-PAGE analysis and quantification of trichloroacetic acid (TCA)-soluble peptides released, degradation of muscle proteins from sjMTs was favorable at pH 5 and 50°C. Proteolysis of MHCs was mostly inhibited by cysteine protease inhibitors, including trans-epoxysuccinyl-L-leucyl-amido (4-guanidino) butane (E-64) and antipain (AP). E-64 and AP completely inhibited the degradation of Pm and Ac, while iodoacetic acid showed a partially inhibitory effect. These results indicated that the proteolysis of sjMTs was mainly attributed to cysteine proteases. Avoidance of setting the tissues at 40–50°C and slightly acidic condition and inhibition of cysteine proteases are helpful for decreasing sea cucumber autolysis.     

城市输送管道小泄漏特征及规律分析

利用实验室油气管道平台和声发射仪,建立了模拟城市输送管道泄漏检测系统。通过实验对气、液管道小泄漏信号特征与衰减特性进行了分析,在改变管道压力、泄漏量以及传感器间距等参数状态下,分别分析了管道泄漏信号的幅值随管道压力、泄漏量、传感器间距变化的规律,对城市输送管道泄漏检测进行了有益的探索。     

Microfabrication and optical properties of highly ordered silver nanostructures

ABSTRACT: Using thermal evaporation, we fabricated five uniform and regular arrays of Ag nanostructures with different shapes that were based on an anodized aluminum oxide template and analyzed their optical properties. Round-top-shaped structures are obtained readily, whereas to obtain needle-on-round-top-shaped and needle-shaped structures, control of the directionality of evaporation, pore size, length, temperature of the substrate, etc., was required. We then observed optical sensitivity of the nanostructures by using surface-enhanced Raman scattering, and we preliminarily investigated the dependency of Raman signal to the roughness and shape of the nanostructures.     

旋滑条件下弹流润滑数值分析

建立旋滑条件下椭圆接触弹流润滑的数学模型,用多重网格法求得该条件下的完全数值解,研究速度、载荷、偏心距和椭圆比对油膜厚度、形状和压力的影响。结果表明,偏心距较小时,油膜厚度和形状都与普通弹流有明显的不同;速度、载荷和椭圆比增加及偏心距减小,均会导致接触区两侧最小膜厚的差值增大,油膜形状的非对称性增强;速度、椭圆比增加,油膜厚度增加,接触区压力减小,载荷增加或偏心距减小,油膜厚度减小,接触区压力增加。