压电驱动精密直线步进电机研究

提出一种新型的定子主动箝位方式压电精密直线步进电机,解决了压电驱动电机箝位不牢固、步进频率较低、行程小、速度低等问题。研制的精密电机能够实现高频率(100Hz),高速度(30mm/min),大行程(>20mm),高精度,大驱动力(100N)等特点,大幅度提高了压电型步进电机的驱动性能。研制的该步进电机在精密运动、微操作、光学工程、精密定位等精密工程中具有一定的应用价值。     

A near-infrared dye for dye-sensitized solar cell: Catecholate-functionalized zinc phthalocyanine

The design and synthesis of an asymmetrical zinc phthalocyanine sensitizer modified with a catechol anchoring group is reported. The performance of this sensitizer was evaluated in a dye-sensitized solar cell. A strong interaction between the catechol dye and TiO₂ (with the formation of a five-membered charge-transfer complex) was evidenced by a strong shift in the Q-band of the ZnPc-Cat from 680 nm in solution to 750 nm on TiO₂, along with an appreciable absorption tail extending to ∼1000 nm. The fabricated solar cell containing the phthalocyanine sensitizer showed relatively high light-to-electron conversion efficiency (η = 0.92%), considering that few catechol dyes exceed η = 0.7% in dye-sensitized solar cells. Values of I_sc = 2.53 mA cm⁻² and V_oc = 540 mV were obtained, referring to a standard N719 cell (η = 6.46%). A comparison of zinc phthalocyanine sensitizers bearing different anchoring groups affirmed the superiority of carboxylate groups relative to those bearing catechol groups in terms of cell performance.     

麦尔兹石灰窑悬挂缸耐火材料的技术改进

从结构和原材料分析华塑公司3座麦尔兹石灰窑悬挂缸浇注料脱落的原因,提出了技术改进方案,介绍了具体处理措施及改进后的效果。     

Smell, think and act: A cognitive robot discriminating odours

In this paper, we explore the integration of an electronic nose and its odour discrimination functionalities into a multi-sensing robotic system which works over an extended period of time. The robot patrols an office environment, collecting odour samples of objects and performing user requested tasks. By considering an experimental platforms which operates over an extended period of time, a number of issues related to odour discrimination arise such as the drift in the sensor data, online learning of new odours, and the correct association of odour properties related to objects. In addition to an electronic nose our robotic system consists of other sensing modalities (vision and sonar), behaviour-based control and a high level symbolic planner.     

Dye sensitized photovoltaic cells: Attaching conjugated polymers to zwitterionic ruthenium dyes

The synthesis of a zwitterionic ruthenium dye that binds to anatase surfaces and has a built-in functionality that allows for the attachment of a conjugated polymer chain is presented. The system was found to adsorb on the surface of anatase anchored by the ruthenium dye. Two types of devices were prepared: standard photoelectrochemical (PEC) solar cells and polymer solar cells. The PEC solar cells employed a sandwich geometry between TiO₂ nanoporous photoanodes and Pt counter electrodes using LiI/I₂ in CH₃CN as an electrolyte. The polymer solar cells employed planar anatase electrodes and the complex was adsorbed onto the surface before evaporation of gold electrodes. Alternative devices were obtained by spincoating of the polymer solution onto PEDOT:PSS covered indium-doped tin oxide substrates. PEC solar cells gave the best results and the main finding was that the polymer chain served as a light harvesting antenna for the ruthenium dye.     

Characterisation and application of new carboxylic acid-functionalised ruthenium complexes as dye-sensitisers for solar cells

A series of ruthenium complexes with and without TiO₂ anchoring carboxylic acid groups have been synthesised and characterised using nuclear magnetic resonance (NMR), UV–vis and luminescence. These complexes were adsorbed on thin films of the wide band-gap semiconductor anatase and were tested as photosensitisers under standard conditions. I/V characteristics of such devices revealed superior performance of the non-symmetric complexes [4′-(4-bromophenyl)-[2,2′; 6′,2″] terpyridine]Ru(II) [4′-(4-bromophenyl)-[2,2′; 6′,2″] terpyridine-4,4″-dicarboxylic acid] and [2,2′; 6′,2″] terpyridine Ru(II) [2,2′; 6′,2″] terpyridine-4′-carboxylic acid with a maximum output power 0.016 mW cm⁻² under illumination at 100 mW cm⁻² AM1.5 and efficiencies 3 times higher than the symmetric complexes.     

评析丹麦海宁艺术中心的设计观念与形态

丹麦海宁艺术中心首次将三个特色鲜明的文化机构结合在一起：海宁艺术博物馆、中西部室内乐乐团和＂世界之基＂展馆,为公众呈现出一个集聚了优秀艺术品和音乐的富有革新精神的集会场所。这座单层的建筑物将景观与建筑融合在一起,以＂建造场所＂为宗旨,以意大利艺术家皮埃罗·曼佐尼的作品和海宁纺织品工业历史为灵感来源,并在混凝土模板中加入防水布,用来在白色水泥外墙上压制出类似纺织品面料的质地。     

采动对综放顺槽稳固性及合理煤柱宽度影响的实测研究

根据公务素地区16#煤层赋存条件,运用工程类比法和数值计算法给出16#煤层顺槽的基本支护方式和支护参数,并将其应用于公务素煤矿二号井北一综放面回风顺槽和相邻工作面运输顺槽围岩稳定性控制的工程实践中.结果表明,所设计的锚固参数可确保综放面采动过程中上下顺槽的稳固性,且预掘巷道时上下工作面顺槽煤柱宽度可由20m减小到15m...     

A Study on the Thermal Stability of La_2O_3-TiO_2 Supports

In this paper,various techniques including BET,XRD,SEM and XPS were used to study the sintering ofpure and La_2O_3-doped titania.The experimental results show that sintering of titania proceeds via volume diffu-sion.Adding of lanthanum oxide decreases the rate of sintering and hinders the phase transition from anatase torutile crystal by strong surface interaction between the mixed crystals(La_4Ti_9O_(24),La_(0.66)TiO_(2.99))and TiO_2.