快速高准确度的闪烁探测技术

闪烁探测器具有探测效率高和适于多种条件下应用等优点。但在高计数率测量时,光电倍增管出现的疲劳现象难以克服,其长期稳定性也较差。 本文提出一种措施,使闪烁探测器在每秒10~5个计数脉冲下获得了高的精度和好的稳定性。这项技术已经应用于FT-1型核子低含沙量计中。经测试表明,当每次测量历时为100秒时该仪器的计数精度和8小时长期     

浅析唐钢棒材厂四线切分轧制技术

唐钢棒材厂利用现有设备解决了Φ12mm螺纹钢四线切分轧制中出现的堆钢问题,提高了产量。     

Mechanism of Thermal Decomposition of Rare Earth Acetate Hydrates

The mechanism of thermal decomposition of rare earth acetate hydrates(Ln(Ac)_3·nH_2O,n=5,forLn=La;n=4,for Ln=Pr→Lu,Y,except Pm)has been studied by TG-DTG,DSC,infrared spectra,X-raydiffraction and chemical analysis.The thermal decomposition reaction consists of two stages,one is dehydrationand the other one is decompostion.The final product is oxide.It has been found that the temperature of pro-ducing anhydrous acetates decreases with increasing atomic number of rare earth elements.The activation ener-gies for dehydration and decomposition reaction of rare earth acetate hydrates have been calculated byFreeman-Carroll and Kissinger method.The dependence of activation energy Jor dehydration reaction on theatomic number of rare earth elements shows“inclined‘W’effect”.The enthalpy changes for dehydration anddecomposition reaction have been determined.     

安钢炼铁厂1号高炉降低生铁成本的实践

安钢炼铁厂1号(350m3)高炉依靠科技进步,抓住高炉自身的特点,保持高炉炉况顺行,实现高煤比喷吹,加强企业管理等措施,使高炉各项技术指标不断改善,生铁成本不断降低.     

连杆机构在钢管矫直机进料辊道设计中的应用

矫直机进料辊道是钢管矫直工艺中必不可少的辅机设备之一。采用两个简单的连杆机构,来设计辊道升降机构和拨料翻盖机构,达到了设计要求,实现了预定功能。整个设备结构简单,各运动机构协调一致,节约了设计制造成本,提高了企业经济效益。     

基于力反馈的夹持器系统模型

分析了基于力反馈的夹持器系统的各个子系统,建立了包括位/力转换子系统、榆测了系统、电机及驱动子系统、控制了系统在内的各子系统数学模型.进而得到了带饱和非线性环节的整个闭环系统的分段状态空间模型.利用系统实际响应,通过最小二乘法和遗传算法得到了该非线性模型的参数,对实际系统、基于2阶线性简化模型的仿真系统与基于本文所提出...     

分析传输线网络的电磁耦合问题

现代当微波辐照一个雷达接收机时,将对雷达接收机产生“带内”干扰但是当入射电磁脉冲作用于系统中的某一设备时,系统中的其他设备也很可能会受到影响。本文采用传输线网络拓扑模型来表示复杂系统,并运用BLT方程来分析传输线网络对电磁激励的响应。最后结合三种典型的系统结构进行了举例分析。     

Short‐Wave Infrared Sensor by the Photothermal Effect of Colloidal Gold Nanorods

Photodetection in the short‐wave infrared (SWIR) spectrum is a challenging task achieved often by costly low bandgap compound semiconductors involving highly toxic elements. In this work, an alternative low‐cost approach is reported for SWIR sensors that rely on the plasmonic‐induced photothermal effect of solution‐processed colloidal gold nanorods (Au NRs). A series of uniform solution‐processed Au NRs of various aspect ratios are prepared exhibiting a strong and well‐defined longitudinal localized surface plasmon resonance (L‐LSPR) maximum from 900 nm to 1.3 µm. A hybrid device structure is fabricated by applying Au NRs on the surface of a thermistor. Under a monochromatic illumination, hybrid Au‐NR/thermistor devices exhibit a clear photoresponse in the form of photoinduced resistance drop in the wavelength window from 1.0 to 1.8 µm. The photoresponsivity of such hybrid devices reaches a maximum value of 4.44 × 10⁷ Ω W^?1 at λ = 1.4 µm (intensity = 0.28 mW cm^?2), a wavelength in agreement with the L‐LSPR of the Au NRs applied. Colloidal Au NRs, capable to perform fast conversion between photon absorption and thermal energy, thus open an interesting avenue for alternative low‐cost SWIR photodetection.     

气测录井资料在泌阳凹陷稠油区钻井中的导向及评价作用

针对泌阳凹陷稠油区油层埋藏浅、成岩性差、地层相变严重、非均质性强的特点,在分析该区稠油形成原因和气测异常特征的基础上,认为在该稠油区钻大斜度井及水平井时,应用气测录井进行地质导向具有反应速度快、抗污染能力强、可有效恢复岩性剖面的优势。根据该稠油区气测录井的全烃和甲烷特征,结合钻时及相关录井资料,以XD1井大斜度定向井为例,阐述了适用于该稠油区的气测录井的地质导向和油层解释方法。实际应用情况表明,气测录井结合钻时进行该稠油区钻井过程中的地质导向,比使用LWD等先进装备具有开发成本低、技术上简便可靠的特点,且效果较好。     

凹凸棒石/聚丙烯酸钾包膜材料的制备与性能研究

以凹凸棒石与丙烯酸为主要原料,采用溶液聚合法制备凹凸棒石/聚丙烯酸钾复合膜材料,探讨了丙烯酸中和度、引发剂、交联剂和凹凸棒石添加量对膜材料吸水倍率和NH+4渗透速率的影响.结果表明:在丙烯酸单体浓度20％、中和度70％、引发剂用量0.1％、交联剂用量0.5％、凹凸棒石用量20％的条件下,合成的复合膜材料吸水倍率最高,达...