重庆江北国际机场空调系统水力平衡技术的应用

本文介绍了水力平衡技术在重庆江北国际机场航站楼空调系统中的应用，通过安装平衡阀和进行水力平衡调试，系统实现了正确、高效运行。     

白天鹅宾馆末端压差式空调冷冻水的平衡

通过广州沙面白天鹅宾馆机械压差式空调冷冻水的水力平衡的调试描述,说明此类空调工程冷冻水流量的设计特点与调试难点。通过阀门操作试验、系统扬程检测、需求流量校核、划分调试模块、现场压差测量等对冷冻水作使用平衡;对问题作技术分析,采取管路清理与降低水阻等办法处理。现代高级酒店空调建筑较多,此文对此类空调的水量平衡调试有一定的参考作用。     

高层建筑通风空调系统调试实施方案设计

高层建筑的通风空调系统中,风量和冷量是影响舒适性的主要方面,因此在建筑空调系统施工完成后,需进行必要的调试工作,以确保系统运行的稳定性,并提升空调系统的舒适性。文章主要对于高层建筑通风空调系统的调试实施方案进行了研究,首先分析了通风空调调试的基本原理,明确了风量以及冷量调试的要点,在此基础上设计了通风空调系统的调试实施方案,对调试前期准备以及调试具体方案均进行了研究,以期有效指导工程实际调试实施。     

空调水系统中的分级式水力平衡调试技术

本文介绍了分级式水力平衡调试的特点,把空调冷冻水管路系统按照末端设备、支管、干管分成三级,从末端级到主干级依次进行水力平衡调试,主干级采用基准流量比值法调试.     

VAV空调施工调试常见认识误区分析探讨

目前国内越来越多的大型写字楼采用VAV空调系统,但在VAV空调系统的施工及调试方面,存在很多认识上的误区。本文对VAV空调系统施工及调试过程中的一些认识误区进行了分析探讨,希望对国内VAV空调系统的施工调试工作有所裨益。     

某机场空调水系统三级混水循环泵组在水力平衡中的应用

本文主要介绍某机场航站楼空调水三级循环泵组的技术要求及在水力平衡中的应用,论述了空调水系统水力失调对系统的危害性,同时提出了解决方案。在水力平衡技术的应用中介绍了目前世界上各种平衡设备,并简要说明了水力平衡调试方法和调试后的节能效果。     

地铁车站设备管理用房通风空调运行优化

车站设备管理用房通风空调系统实际运行中,主要存在两个方面的问题,一是空调小系统风量分配不合理;二是系统的运行控制策略不明确。针对这两个问题,开展了改进和优化工作,一是对车站设备管理用房通风空调系统进行风量平衡测试与调试,二是优化空调小系统运行策略,细化运行模式表,以求在满足车站设备管理用房通风使用要求的基础上,达到节能的目的。     

空调风系统调试中的主要问题及其研究

空调风系统的调试工作对于系统建成后运行效果的好坏有着重要的影响,本文在分析国内调试工作现状的基础上对目前存在的几个主要问题进行讨论研究,包括进行四通局部阻力系数的确定以及计算机辅助调试系统的开发,研究的结果将有利于国内空调风系统调试水平的发展和提高.     

定静压变风量空调系统风平衡调试技术

本文在传统空调风平衡调试技术的基础上,结合广州财富中心项目变风量系统的特点,利用BAS技术发展,摸索并总结出一套适合在变风量空调风系统中运用的风平衡调试技术,有效地解决了传统方法效率低、精度不高的问题。     

空调水系统测试和调试的基本理论与实践

介绍了空调水系统的阻力平衡原理,并通过试验对此理论进行比较.结果显示:理论和试验数据吻合得很好,为实际调试和运行维护提供了依据和指导.     

Effect of cracks on thermal stress and strain of a tape automated bonded package

A tape automated bonded (TAB) package is basically a composite structure. A three-dimensional finite element fracture analysis was performed to evaluate the effects of cracks in a TAB package under thermal cycling conditions. The lead-tin solder in the outer lead bond as well as the copper beam lead were taken as elasto-plastic materials. Interface cracks between the copper beam lead and the solder were included in the analysis. It was found that the prescribed cracks created new sources of stress concentrations, which are fairly mild. This result showed that the configuration of the outer lead bonds in TAB packages is generally resilient to thermal cycling, even with the presence of defects such as cracks.     

Preparation and characterization of semiconductor-organic films with a mesolamellar structure

Semiconductor-organic composite films built up of titania and surfactants (e.g. C₁₆TAB, C₁₄TAB, C₁₂TAB) have been prepared on glass substrates at 50°C in air and under hydrothermal conditions, respectively. XRD, SEM, TEM and UV-VIS diffuse reflectance spectra studies indicate that a lamellar mesostructure with d spacing of 34 Å is obtained and the thickness of the titania layer intercalated between organic layers is less than 1 nm.     

有机柱撑水黑云母功能材料层间域有机柱结构排布模式

用十八烷基三甲基溴化铵(C18TAB)对具有蛭石晶层与云母晶层的规则间层矿物水黑云母进行有机柱撑,运用XRD对其粉末样表征,研究随着C18TAB加入量的增大,有机离子团在水黑云母的蛭石晶层与云母晶层中排布模式的演化.结果表明,水黑云母在不同的柱撑液浓度下,在其蛭石晶层中随着有机堆垛密度不断增大而出现了倾斜单层、倾斜双层两种空间排布模式;而在云母晶层中则只有倾斜双层一种排布模式.其空间排布演化模式为:蛭石晶层中倾斜单层→蛭石晶层中倾斜双层→蛭石晶层与云母晶层中倾斜双层,最终C18TAB在水黑云母的云母晶层与蛭石晶层层间域中有相同的倾斜双层排布模式.     

C18TAB为模板剂合成有序多孔掺锡氧化锆

以C18TAB为模板剂,氧氯化锆和四氯化锡为原料,采用共沉淀法成功合成了不同掺锡量的有序多孔氧化锆.通过XRD、N2吸-脱附、FT-IR等技术表征材料的孔结构.结果表明,掺锡氧化锆孔排布为六方有序,材料的热稳定性、比表面积均高,与C16TAB为模板剂合成的结果相比,d100值、孔容明显增大,S(5)Zd100增大了0.22 nm.     

Rapid synthesis of gold nanostructures by a microwave–polyol method with the assistance of CnTAB (n = 10, 12, 14, 16) or C16PC

Gold nanostructures have been synthesized by a microwave(MW)–polyol method with the assistance of such cationic surfactants as alkyltrimethyl ammonium bromide (C_nTAB: n = 10–16, even numbers) or cetylpryridinium chloride (C₁₆PC). Although major products were spherical aggregates for C_nTAB (n = 10, 12, 14), triangular, pentagonal, and hexagonal nanoplates were preferentially synthesized using C₁₆TAB. Spherical spike-ball structures were prepared through C₁₆PC. These results indicated that the morphology of gold nanostructures prepared by the MW–polyol method depends both on the chain length of hydrophobic alkyl group and on the hydrophilic head group.     

Adsorption of Thorium from Aqueous Solution using Nanoporous Adsorbents: Effect of Contact Time,pH, Initial Concentration,and Temperature

Nanoporous silicates MCM-41 have been prepared using different surfactants such as cetyltrimethylammonium bromide (C₁₆TAB) and dodecyltrimethylammonium bromide (C₁₂TAB) as template. The adsorbents are characterized using powder x-ray diffraction, nitrogen adsorption-desorption isotherm data, scanning electron microscopy, and transmission electron microscopy. The thorium sorption was studied as a function of shaking time, pH, initial concentration, and temperature. The sorption of thorium at the determined optimum conditions follows Langmuir and Freundlich isotherms. The results show that the nanoporous MCM-41 synthesized by C₁₂TAB has more adsorption capacity than the MCM-41 synthesized by C₁₆TAB (77.6 µmol · g^?1 vs. 52.1 µmol · g^?1) at 25°C. Th(IV) adsorption onto nanoporous adsorbents was very fast process and therefore, this adsorbent is suitable for column separation. Thermodynamic parameters such as ΔH°, ΔS° and ΔG° were found to be 47.76 KJ · mol^?1, 196.21 J · mol^?1 · K^?1, and 19.00 KJ · mol^?1, respectively (at 298 K). The positive value ΔH° suggested the endothermic nature of adsorption and negative ΔG° indicates the feasibility and spontaneity of the adsorption process.     

Double-chained surfactants for semipermanent wall coatings in capillary electrophoresis

The double-chained cationic surfactant didodecyldimethylammonium bromide (DDAB) was found to form more stable coatings onto the walls of CE capillaries than similar single-chained surfactants such as cetyltrimethylammonium bromide (C16TAB). After removing DDAB from the buffer, the reversed EOF decreased only 3% over 75 min under continuous electrophoretic conditions. Also, the reversed EOF is 60% greater for DDAB than for C16TAB at pH 2. This greater coating stability is associated with a different aggregate structure for the surfactant at the capillary surface. The more homogeneous coating and greater surface coverage provided by DDAB allows the excess surfactant to be flushed from the capillary prior to performing electrophoretic separations. Separations of a basic protein mixture yielded quantitative recoveries, efficiencies ranging from 560,000 to 750,000 plates/m, and migration time reproducibility of 0.8-1.0% RSD (n = 10). This performance is similar to that of adsorbed cationic polymers (Polybrene, polyethyleneimine) but is achieved using a coating procedure that is over 10 times faster.     

PBI及衍生物的合成及其溶解性能研究

由间苯二甲酸(II)A)和3,3',4,4'-二氨基联苯胺(TAB)采用逐步升温溶液缩聚的方法合成了聚苯并味唑(PBI),并通过FT-IR、1H-NMR和TGA等对其进行了表征,讨论了聚合过程中的影响因素,优化了聚合条件,同时还比较了PBI和聚(2,5-苯并咪唑)(ABPBI)在不同溶荆中的溶解性能.     

Therapeutic aerosol bioengineering of targeted, inhalable microparticle formulations to treat Mycobacterium tuberculosis (MTb)

Therapeutic aerosol bioengineering (TAB) of Mycobacterium tuberculosis (MTb) therapies using inhalable microparticles offers a unique opportunity to target drugs to the site of infection in the alveolar macrophages, thereby increasing dosing in the lungs and limiting systemic exposure to often toxic drugs. Previous work by us used sophisticated, high content analysis to design the optimal poly(lactide-co-glycolic) acid (PLGA) microparticle for delivery of drugs to alveolar macrophages. Herein, we applied this technology to three different anti-MTb drugs. These formulations were then tested for encapsulation efficiency, drug-release, in vitro killing against MTb and aerosol performance. Methods for encapsulating each of the drugs in the PLGA microparticles were successfully developed and found to be capable of controlling the release of the drug for up to 4 days. The efficacy of each of the encapsulated anti-MTb drugs was maintained and in some cases enhanced post-encapsulation. A method of processing these drug-loaded microparticles for inhalation using standard dry powder inhaler devices was successfully developed that enabled a very high respirable dose of the drug to be delivered from a simple dry powder inhaler device. Overall, TAB offers unique opportunities to more effectively treat MTb with many potential clinical and economic benefits resulting.