基于网络接口模块GBI001的锅炉监控系统设计

本文以工业园区锅炉房五台锅炉控制系统为背景,从控制整体出发,利用ProficyMachine Edition5.5软件对三个站进行组态,并对网络接口单季VermaxIC200GBI001模块组态给出案例介绍。     

A 2D/1D TiO2 nanosheet/CdS nanorods heterostructure with enhanced photocatalytic water splitting performance for H2 evolution

TiO₂ with exposed (001) facets were composited with CdS nanorods to construct 2D/1D heterojunction. As comparison, P25 with mainly exposed (101) facets were employed to combine with CdS nanorods. The 2D/1D heterojunction of TiO₂ nanosheets and CdS nanorod displayed 3.7 times higher hydrogen generation than that of P25/CdS composites. The results indicated that TiO₂ with exposed (001) facets were favorable for enhancing the photocatalytic activity of CdS via optimizing the heterojunction between TiO₂ and CdS. Photoluminescence and photoelectrochemical characteristics results demonstrated that the 2D-TiO₂/1D-CdS heterojunction exhibits higher separation efficiency of photoinduced carriers and superior electron transfer ability. This work exemplifies that heterojunction modification is an effective strategy to improve the efficiency of the photocatalyst composites.     

离子交换法从氧化铜钴矿加压氨浸液中分离铜钴的研究

针对两段氨性加压浸出氧化铜钴矿新工艺所产生的氨浸液,用(NH4)_3PO_4净化除杂以及D001交换树脂离子交换分离铜钴的方法来取代直接蒸馏法。在氨浸液250mL,搅拌转速500r/min,反应温度25℃,(NH4)_3PO_4质量为氨浸液中Ca、Mg、Fe总量的3倍,反应时间30min的条件下,杂质Ca、Fe、Mg的脱除率分别为98.37%、98.33%和96.3%,对主元素Cu、Co损失影响不大。静态试验结果表明,在D001交换树脂10g、除杂后氨浸液200mL、30℃恒温振荡8min的条件下,铜吸附率达到91.88%,钴吸附率下降至1.87%。动态试验结果表明,金属离子与D001树脂交换能力强弱顺序为CuNiMnZnFeMgCo。用盐酸洗脱D001离子交换树脂即可得到纯度较高的钴液,实现钴与其它金属杂质离子的分离。     

Hydrothermal preparation of Ag-TiO2 nanostructures with exposed {001}/{101} facets for enhancing visible light photocatalytic activity

Nano-composite materials of Ag nanoparticles dispersed TiO₂ nanocubes with exposed {001}/{101} crystal faces were fabricated mainly via a flexible one-step method of hydrothermal treatment with different content of Ag from 1 up to 3 mol%. Prepared photocatalysts were characterized by X-ray diffraction, scanning electron microscope, transmission electron microscopy, UV–vis absorption spectroscopy, X-ray photoelectron spectroscopy and Raman spectroscopy. These analysis was carried out for understanding the contribution of different content of silver for enhancing the photocatalytic activity of TiO₂ nanocubes. Prepared silver nanoparticles had small particle size and grafted to the {101} crystal face of TiO₂ with the role of template control agent and linking agent. The photocatalytic performance of Ag-TiO₂ nanocubes were researched via Rhodamine B dye removal under visible light irradiation ( ≧420 nm). Ag-TiO₂ composite materials with the content of 2 mol% Ag showed the best photocatalytic activity for degradation of Rhodamine B, which was five times more than bare TiO₂ and associated with the localized surface plasmon resonance (LSPR) propelled effect. The mechanism by which silver enhanced the photocatalytic activity of TiO₂ was also demonstrated.     

In-situ FT-IRAS study of the CO oxidation reaction over Ru(001): III. Observation of a 2140 cm−1 C-O stretching vibration

Utilizing Fourier Transform Reflection Absorption-Infrared Spectroscopy (FT-IRAS), we have investigated the CO oxidation reaction in-situ on a Ru(001) surface at high ( 10 Torr) pressures. Under certain temperature and reactant (CO and O₂) partial pressure conditions, we observe for the first time on unsupported Ru a weakly adsorbed CO species which is characterized by an unusually high C-O stretching frequency of 2140 cm^–1. A similar feature has been identified previously on small Ru particles in supported catalysts and attributed by some to a multicarbonyl species (–Ru(CO) _n ,n > 1). By following the intensity of this feature on Ru(001) relative to other peaks in the spectra, we believe that the 2140 cm^–1 peak observed here is most likely due to a highly perturbed linearly adsorbed monocarbonyl on partially oxidized Ru sites generated by locally high concentrations of coadsorbed oxygen.Sandia National Laboratories is supported by the United States Department of Energy under contract number DE-AC04-76DP00789.     

TiO<Subscript>2</Subscript> nanosheets with exposed {001} facets for photocatalytic applications

TiO₂ nanosheets with highly reactive {001} facets ({001}-TiO₂) have attracted great attention in the fields of science and technology because of their unique properties. In recent years, many efforts have been made to synthesize {001}-TiO₂ and to explore their applications in photocatalysis. In this review, we summarize the recent progress in preparing {001}-TiO₂ using different techniques such as hydrothermal, solvothermal, alcohothermal, chemical vapor deposition (CVD), and sol gel-based techniques. Furthermore, the enhanced efficiency of {001}-TiO₂ by modification of carbon materials, surface deposition of transition metals, and non-metal doping is reviewed. Then, the applications of {001}-TiO₂-based photocatalysts in the degradation of organic dyes, hydrogen evolution, carbon dioxide (CO₂) reduction, bacterial disinfection, and dye-sensitized solar cells are summarized. We believe this entire review on TiO₂ nanosheets with {001} facets can further inspire researchers in associated fields.

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从开心网看网络广告形式的多元化发展

传统单一的网络广告形式已经不能满足新时期人们对营销和传播的需求,本文拟从开心网的发展历程和广告模式解读作为切入,通过对该网站的深入调研,对其成熟的广告形式进行类型化解析,为网络广告实现和品牌联手的长远合作与赢利探寻可行之路,为网络广告形式的多元化发展提供坚实的理论基础。     

Growth and characterization of Bi2Sr2Ca1Cu2O8+x single crystals

High-quality single crystals are well suited to the investigation of some intrinsic material properties. A modified Bridgman method using a sharp temperature gradient (300°C/cm) was used to grow Bi₂Sr₂Ca₁Cu₂O_8+x single crystals. Although the samples were contained in alumina ampoules, no aluminium contamination of the samples was detected. Blade-shaped crystals up to 7–8 mm length and 3–4 mm width could be grown by this method, although extraction from the matrix was difficult. Electron diffraction patterns of the [001] zone axis revealed a high degree of crystallinity. The narrowness of the superconducting transition temperature, as determined by ac susceptibility, also suggests the existence of well-formed crystalline domains. In order to determine the relative orientation of the crystalline domains, electron channeling patterns were recorded from several consecutive growth steps from a fracture surface. The poor contrast of these and Kikuchi patterns suggests the presence of a stacking structure. The results showed a [100] growth direction and (001) cleavage plane. Reversible oxygen loss at the peritectic decomposition temperature of 863°C was observed. Knoop indentation measurements showed that the crystals were quite soft, having a microhardness of 0.44 GPa.     

TiO2基催化剂还原CO2研究进展

能源危机和环境污染是当今世界发展面临的两大挑战,如何有效缓解煤、石油等不可再生化石资源过度消耗所引发的能源危机,以及由此造成CO₂过量排放引起的温室效应问题,是当前人类发展亟待解决的重大科学问题之一。基于此,本文综述了近年来以TiO₂为光催化剂,以绿色、清洁的太阳光能催化还原CO₂成低价态含碳燃料(如CH₄、CH₃OH、HCHO、HCOOH、C₂H₅OH等)研究进展。在TiO₂光还原CO₂机理基础上,对元素掺杂、半导体复合与染料敏化、高活性晶面调控、低维纳米结构设计、助催化剂、Z型结构设计和单原子催化等方法来提高光还原CO₂反应效率和选择性进行分析,并指出目前研究存在的关键问题和未来CO₂光还原的发展方向。     

Magnetic properties and structure of （001）-oriented [CoPt/C]n/Ag nanocomposite films on the glass substrates

The highly （1301） oriented triple system of [CoPt/C]n/Ag films was deposited on glass substrates by DC and RF magnetron sputtering. After annealing at 600℃ for 30 min, thin films become magnetically hard with coercivities in the range of 160-875 kA/m because of high anisotropy associated with the L10 ordered phase. C doping plays an important role in improving （001） texture and reducing the intergrain interactions. The oriented growth of CoPt films was influenced strongly by the number of repetitions （n） of CoPt/C. By controlling the C content and the number of repetitions （n） of CoPt/C, nearly perfect （001） orientation can be obtained in the [CoPt3nm/C3nm]5/Ag50 nm.