两相热压缩机冷却方式的比较研究

基于自行设计研制的中国国内首台两相热压缩机,分别研究了水冷和空气自然冷却两种冷却方式对两相热压缩机性能的影响.研究发现,两相热压缩机对冷却方式非常敏感.该压缩机在0.2 Hz、0.4 Hz、0.6 Hz和0.8 Hz频率下运行时,采用水冷时,压比基本上保持不变,即使加热功率达到220 W;但采用空气自然冷却时,压比达到5.0以上,且加热功率不超过140 W.     

Rational Design of Three‐Layered TiO2@Carbon@MoS2 Hierarchical Nanotubes for Enhanced Lithium Storage

Here we demonstrate the rational design and synthesis of three‐layered TiO₂@carbon@MoS₂ hierarchical nanotubes for anode applications in lithium‐ion batteries (LIBs). Through an efficient step‐by‐step strategy, ultrathin MoS₂ nanosheets are grown on nitrogen‐doped carbon (NC) coated TiO₂ nanotubes to achieve the TiO₂@NC@MoS₂ tubular nanostructures. This smart design can effectively shorten the diffusion length of Li⁺ ions, increase electric conductivity of the electrode, relax volume variation of electrode materials upon cycling, and provide more active sites for electrochemical reactions. Owing to these structural and compositional features, the hierarchical TiO₂@NC@MoS₂ nanotubes manifest remarkable lithium storage performance with good rate capability and long cycle life.     

Characteristics of evolution of mining-induced stress field in the longwall panel:insights from physical modeling

The evolution of mining-induced stress field in longwall panel is closely related to the fracture field and the breaking characteristics of strata.Few laborator...     

基于互联网的扫描探针显微镜远程控制研究

在Ｉｎｔｅｒｎｅｔ信息传输的基础上,实现了数字化ＳＰＭ的远程控制。用户首先在连接ＳＰＭ的服务器上远程登陆,并取得不同的控制权。在得到主要操作人,协作者或旁观者的权力后,分别能远程直接控制ＳＰＭ的全部参数,部分参数,或不能控制参数。该系统已经在北京与上海两城市间进行了演示。     

FMI-Ⅰ-600型钕铁硼真空速凝炉冷却强度对铸带组织的影响

采用Nd-Pr合金、工业硼铁、纯铁及海绵锆为原料,在不同的冷却速度下采用FMI-Ⅰ-600型真空速凝炉制备Re(Nd,Pr)FeB永磁合金铸带,分析了速凝薄带的厚度分布,采用扫描电子显微镜及能谱重点分析了铸锭的组织结构,从而确定了合理的冷却范围。本文在真空条件下加热1400～1450℃,氩气保护下在1.5～2.0m/s的冷却速度下获得的速凝薄片形成了完整的柱状晶,富稀土相均匀分散在主相周围,有效抑制α-Fe的生成。     

Construction of Complex Co3O4@Co3V2O8 Hollow Structures from Metal–Organic Frameworks with Enhanced Lithium Storage Properties

A novel metal–organic‐framework‐engaged strategy is demonstrated for the preparation of multishelled Co₃O₄@Co₃V₂O₈ hybrid nanoboxes. This strategy relies on the unique reaction of zeolitic imidazolate framework‐67 with the vanadium source of vanadium oxytriisopropoxide. Benefitting from the synthetic versatility, a series of nanostructures can be realized including triple‐shelled and double‐shelled Co₃O₄@Co₃V₂O₈ nanoboxes and single‐shelled Co₃V₂O₈ nanoboxes. When evaluated as electrode materials for lithium‐ion batteries, these unique hollow structures demonstrate remarkable lithium storage properties. For example, the triple‐shelled Co₃O₄@Co₃V₂O₈ nanoboxes retain a high capacity of 948 mAh g^?1 after 100 cycles at 100 mA g^?1.     

Flexible Smart Noncontact Control Systems with Ultrasensitive Humidity Sensors

The development of noncontact humidity sensors with high sensitivity, rapid response, and a facile fabrication process is urgently desired for advanced noncontact human–machine interaction (HMI) applications. Here, a flexible and transparent humidity sensor based on MoO₃ nanosheets is developed with a low‐cost and easily manufactured process. The designed humidity sensor exhibits ultrahigh sensitivity, fast response, great stability, and high selectivity, exceeding the state‐of‐the‐art humidity sensors. Furthermore, a wearable moisture analysis system is assembled for real‐time monitoring of ambient humidity and human breathing states. Benefiting from the sensitive and rapid response to fingertip humidity, the sensors are successfully applied to both a smart noncontact multistage switch and a novel flexible transparent noncontact screen for smart mobile devices, demonstrating the potential of the MoO₃ nanosheets‐based humidity sensors in future HMI systems.     

Fabrication and Properties of DC Magnetron Sputtered Indium Tin Oxide on Flexible Plastic Substrate

Indium tin oxide (ITO) thin films deposited on flexible polyethylene terephthalate (PET) substrates at low temperature by DC magnetron sputtering from an In-Sn (90-10 wt pct) alloy target were studied. The correla-tion between deposition conditions and ITO property was systematically investigated and characterized. These as-deposited ITO films were used as the anode contact for flexible organic light-emitting diodes (FOLEDs). The fabricated FOLEDs with a structure of PET/ITO/NPB (50 nm)/Alq (20 nm)/Mg:Ag (100 nm) showed a maximum luminance of 2125 cd/m2 at 13 V.     

A Full Compositional Range for a (Ga1‐x Zn x )(N1‐x O x ) Nanostructure: High Efficiency for Overall Water Splitting and Optical Properties

Bulk (Ga_1‐x Zn _x )(N_1‐x O _x ) as a photocatalyst has received increasing attention as a potential solution for the energy shortage challenge; however, its catalytic performance is highly limited by its bulk form. To improve the photochemical potential, the nanoscale form of this multiple‐metal oxynitrides is desirable. In this work, a new type of (Ga_1‐x Zn _x )(N_1‐x O _x ) nanostructure is obtained. Its composition can tuned to the full range (0.18 < x < 0.95). The (Ga_1‐x Zn _x )(N_1‐x O _x ) nanostructure exhibits excellent photocatalytic activity for overall water splitting, and the highest quantum efficiency of (Ga_1‐x Zn _x )(N_1‐x O _x ) is as high as 17.3% under visible light irradiation. Using this new type of (Ga_1‐x Zn _x )(N_1‐x O _x ) nanostructure, the narrowing of the bandgap for (Ga_1‐x Zn _x )(N_1‐x O _x ) is not only due to an increase in the valence band maximum, but it is also related to a decrease in the conduction band minimum.     

塑料方形把手注射成型工艺的探讨

通过对方形把手的工艺分析,介绍了模具的结构特点及设计方法,满足了产品技术要求,提高了塑件表面质量.