球墨铸铁Dg75阀体消失模近净型铸造

介绍消失模工艺生产Dg75闸阀阀体铸件的铸造工艺，生产过程中铸件重要装配尺寸精度的保证，铸件表面粗糙度、铸件表面碳夹杂缺陷及表面皱皮现象控制等试验情况。通过模具结构设计、成型工艺及参数的调整、浇注工艺的调整、陶瓷成型浇道的应用等措施，使铸件表面质量及尺寸精度符合客户验收标准。同时使铸件表面因轻微缺陷的返修率由试验初期的90％下降到10％以内，产品合格率达到99％。     

Ion-exchange synthesis of Co-functionalized titanate nanotubes and their application in electrochemical capacitors

Co-functionalized titanate nanotubes (Co-Ti-NTs) were successfully synthesized by means of an ion-exchange reaction. In contrast to the pristine titanate nanotubes (Ti-NTs), Co-Ti-NTs retained rich porous channels and owned even larger specific surface area and better electronic conductivity, which rendered electrons and OH^? ions easily contact the Co species uniformly distributed on their surfaces for energy storage at high rates. The Co-Ti-NTs delivered a specific capacitance (SC) of 124 F g^?1 at 0.4 A g^?1, and a SC degradation of ca. 7% after 1500 continuous cycling at 3 A g^?1, indicating that the Co-Ti-NTs were good candidates and/or even good supports for other electroactive materials for supercapacitors application.     

Magneto－optic Current Sensor Based on Total Reflections in a Quadrangular Bulk Glass

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Peapod‐like Li3VO4/N‐Doped Carbon Nanowires with Pseudocapacitive Properties as Advanced Materials for High‐Energy Lithium‐Ion Capacitors

Lithium ion capacitors are new energy storage devices combining the complementary features of both electric double‐layer capacitors and lithium ion batteries. A key limitation to this technology is the kinetic imbalance between the Faradaic insertion electrode and capacitive electrode. Here, we demonstrate that the Li₃VO₄ with low Li‐ion insertion voltage and fast kinetics can be favorably used for lithium ion capacitors. N‐doped carbon‐encapsulated Li₃VO₄ nanowires are synthesized through a morphology‐inheritance route, displaying a low insertion voltage between 0.2 and 1.0 V, a high reversible capacity of ≈400 mAh g^?1 at 0.1 A g^?1, excellent rate capability, and long‐term cycling stability. Benefiting from the small nanoparticles, low energy diffusion barrier and highly localized charge‐transfer, the Li₃VO₄/N‐doped carbon nanowires exhibit a high‐rate pseudocapacitive behavior. A lithium ion capacitor device based on these Li₃VO₄/N‐doped carbon nanowires delivers a high energy density of 136.4 Wh kg^?1 at a power density of 532 W kg^?1, revealing the potential for application in high‐performance and long life energy storage devices.     

Articulate Studio＇09在课件制作中的使用方法和技巧

有效运用多媒体远程教育现代化的教学手段,关键是要设计和制作出大量符合教学要求、丰富多样、引人入胜且符合国际通用标准的多媒体网络课件。将Articulate这个简单专业的软件与易用的PowerPoint相结合,必将对教育培训的发展产生积极影响。     

钒基负极材料在锂离子电容器中的应用

锂离子电容器一个电极采用电池型负极,一个采用电容型正极,因而兼具高能量密度、高功率密度的优点,有望成下一代新型储能器件.基于Faraday反应的电池型电极与电容型电极动力学不匹配是锂离子电容器的一个巨大挑战,因此研究者们发展了多种倍率性锂离子电池材料.在这些材料中,钒基材料以其成本低、比容量大、倍率性能优异等优点被认为...     

一种耐水型室内腻子的耐水渗透性测定方法探讨

介绍了一种用于评价耐水型室内腻子的耐水渗透性测定方法,通过测量浸入水中的腻子层在一定时间内渗透的距离反映出腻子的耐水渗透性能.该方法与JG/T 298-2010《建筑室内用腻子》方法中耐水型腻子的耐水性和粘结强度有规律的数据变化关联性,腻子的耐水渗透性越差对应的耐水性和粘结强度也越差.该方法能量值化的测出耐水型腻子的耐...     

Flexible Hybrid Paper Made of Monolayer Co3O4 Microsphere Arrays on rGO/CNTs and Their Application in Electrochemical Capacitors

A facile one‐step hydrothermal method is developed for large‐scale production of well‐designed flexible and free‐standing Co₃O₄/reduced graphene oxide (rGO)/carbon nanotubes (CNTs) hybrid paper as an electrode for electrochemical capacitors. Densely packed unique Co₃O₄ monolayer microsphere arrays uniformly cover the surface of the rGO/CNTs film. The alkaline hydrothermal treatment leads to not only the deposition of Co₃O₄ microspheres array, but also the reduction of the GO sheets at the same time. The unique hybrid paper is evaluated as an electrode for electrochemical capacitors without any ancillary materials. It is found that the obtained hybrid flexible paper, composed of Co₃O₄ microsphere array anchored to the underling conductive rGO/CNTs substrate with robust adhesion, is able to deliver high specific capacitance with excellent electrochemical stability even at high current densities, suggesting its promising application as an efficient electrode material for electrochemical capacitors.