地铁车站深基坑围护结构变形监测与数据分析

结合无锡地铁1号线梁东路地铁车站明挖法施工的具体情况,介绍了车站深基坑监测方案,并对围护结构水平位移和内支撑轴力监测数据进行分析,探讨位移和内支撑轴力随施工工况变化的规律及机理,为类似基坑作业提供借鉴。     

A review of CO2 sorbents for promoting hydrogen production in the sorption-enhanced steam reforming process

Sorption-enhanced-steam-reforming (SESR) is a thermochemical conversion technology that produces a high-purity hydrogen stream by utilizing in-situ removal of CO₂ with a sorbent. In this paper, the advantages and disadvantages of CaO based sorbents, alkali-metal based sorbents (Na₂ZrO₃, Li₂ZrO₃ and Li₄SiO₄), hydrotalcite based sorbents, bifunctional materials and sorbents prepared from wastes are briefly discussed, and the techniques to improve the sorption properties of these CO₂ sorbents are summarized. In the process of hydrogen production by sorption-enhanced-steam-reforming, the selection of suitable high-temperature CO₂ sorbent is the key to produce high purity hydrogen. Furthermore, the hydrogen-production performance of the above-mentioned sorbents in the SESR process is investigated and summarized. Finally, a future perspective and some suggestions regarding these five types of sorbents are put forward.     

玻璃棉板和岩棉板在外墙外保温系统中应用关键技术研究

对玻璃棉板和岩棉板应用于外墙外保温系统中存在的吸水量大、实际节能效果不佳,板材拉拔强度不高、体系抗风荷载能力不强、板材湿流密度大、适用于EPS外保温体系的饰面层不一定适用于无机棉板材外保温体系等问题进行了系统研究。研究结果显示,玻璃棉板和岩棉板应用于外墙外保温体系时,应在EPS外保温体系的系统构造和性能要求上做适当调整:板材应该进行界面增强处理;体系应该采用粘结、机械固定相结合的方式提高系统抗风荷载能力,锚固件应该穿透增强网;无机棉板材透气性良好,为减少因饰面层湿流密度太小导致的面层空鼓脱落,应该尽量配套粉状彩色砂浆、真石漆等湿流密度不低于2.5 g/(m2·h)的饰面材料。     

Electromagnetic interference shielding,mechanical properties and water absorption of copper/bamboo fabric (Cu/BF) composites

Copper/bamboo fabric (Cu/BF) composites were prepared by electroless deposition via a tin-free process. The process involved 3-aminopropyltrimethoxysilane modification, noble metal (Au or Pd) activation and electroless copper planting of BF. The copper deposition rate via Pd catalytic process was 1.01 mg/cm² h, higher than that by Au catalytic process (0.85 mg/cm² h). The microstructure of Cu/BF composites was analyzed by scanning electron microscopy (SEM), and the copper coatings were composed of ball-shaped copper particles. The composition and chemical state of copper layers were measured by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) spectra, Cu⁰ was detected but copper dioxide was not found in both spectra. The electromagnetic interference, water absorption, mechanical tension, conductivity and adhesion properties of Cu/BF samples (weight ratio of Cu/BF: 0.36 ± 0.01) were measured to obtain the qualities of the composites.     

一个同轴Ge(Li)探测器的快中子辐射损伤

实验结果表明:本文给出的探测器对快中子辐射损伤的灵敏度相当高。当累积中子通量为6.22×10~8cm~(-2)时,探测器对~(60)Co 1.33MeV γ射线的能量分辨(FWHM)大幅度变坏,为辐射损伤前的三倍;观察到了损伤后的能量分辨的瞬态变化现象;用~(137)C662keV的γ射线扫描技术从实验上再次证明了快中子辐射在探测器中产生空穴陷阱,导致能量分辨变坏。采用简单的净化漂移方法,能恢复损伤过的探测器的性能。     

具有非易失存储功能的可逆有机电双稳器件

报道一种能够在室温下具有可逆电双稳特性，并实现非易失信息存储功能的有机薄膜器件。器件为简单的三层结构，Al/HPYM/Ag，HPYM为一种有机分子材料，通过真空热蒸发法制成薄膜作为信息存储介质。该器件可通过正向及反向电压脉冲的激发而实现高阻态（“0”态）、低阻态（“1”态）的转变，相当于信号的写入和擦除。当外电场撤除时，其状态信息可以长时间保持，并且被小电压脉冲读取，两种导电态的阻值比约为10^5。     

Synthesis and characterization of 1,3,2-diazaboroine derivatives for organic thin-film transistor applications

2,2′-(1,4-Phenylene)bis(2,3-dihydro-1H-naphtho[1,8-de]-1,3,2-diazaboroine) [PND] and 2,2′-(4,4′-biphenylene)bis(2,3-dihydro-1H-naphtho[1,8-de]-1,3,2-diazaboroine) [BND] were synthesized and characterized by using differential scanning calorimetry (DSC) measurements, single crystal X-ray structure analysis, UV–vis absorption and electrochemical measurements, thin-film X-ray diffraction (XRD) and AFM studies. Organic field-effect transistors (OFETs) were fabricated by vacuum deposition with a bottom contact geometry using Au electrodes. Annealing treatment optimizes the organic active layer and increases the charge carrier mobility. Field-effect mobilities of 7.2 × 10^?3 for PND and 4.1 × 10^?4 cm² V^?1 s^?1 for BND were found.     

PTC动作时间测量仪

介绍PTC动作时间测量仪的原理、电路和软件。     

液态CO_2驱油井筒注入的工程传热计算

CO2驱油提高油田采收率（EOR）是三次采油的重要手段之一。注入液态CO2温度随着地层深度的变化而变化,国内还没有对液态CO2注入过程的温度进行过定量的数值计算。通过建立井筒传热模型,进行传热过程分析,并利用便捷的数学处理方法,进行数值计算,研究了液态CO2在井筒中的温度变化规律。     

游梁式抽油机刹车防溜车装置的研制与应用

为预防游梁式抽油机刹车溜车,确保在进行抽油机维护保养等作业时人员生命安全和设备安全,有必要弄清目前抽油机溜车现象发生的原因,识别刹车溜车的危害。针对游梁式抽油机刹车常见的溜车现象,根据齿轮啮合传力原理和平面铰链四连杆原理设计了游梁机外抱式刹车防溜装置。当游梁机刹车驴头停靠在需要的位置后,拉紧防溜装置操纵杆并锁止,在铰链四连杆机构力的作用下,锁止摇臂及固定在其上的锁止齿轮随即与固定在刹车轮上的齿盘啮合,依靠锁止齿轮与齿盘的啮合阻止齿盘的转动,阻止刹车轮及减速器输入轴的转动,避免刹车溜车现象的发生。该装置能避免抽油机刹车因刹车摩擦辐意外失效而溜车,消除刹车溜车给人员和设备造成的安全隐患,操作方法简单、使用方便、性能可靠,能降低在抽油机上作业时的安全风险。