工艺冷却器的螺旋线自动清洗节能

含结晶性料液在工艺冷却器降温过程中,存在一个冷却面上快速结晶的问题,造成冷却器的冷却效率急剧下降,同时料液的流动阻力快速上升,造成能耗很高和被迫周期性的频繁停车.螺旋线的自转要求最低流速(约0.4m/s)远低于工艺设计流速(1.5m/s),能够很可靠地连续自转,清洗能力强,传热强化幅度高,阻力不高,4台工艺设备串联的总阻力0.16 MPa,只有现有工艺泵扬程32m的一半.预计工艺冷却器全部采用螺旋线技术以后,盐矿冷却器的不仅每年节电在200万度以上,而且设备产能增大50%以上.     

Synthesis and ionic conductivity of comb-like polysiloxanes with Pendant oligo(oxyethy1ene) side chains and quaternary ammoniurn groups

Summary A series of novel comb-like polysiloxanes with oligo(oxyethy1ene) side chains and quaternary ammonium groups, has been synthesized by hydrosilylation of poly(methylhydrosi1oxane) with poly(ethy1ene glycol) allyl methyl ether and N,N-dimethylallylamine, followed by quaternization with methyl iodide. The glass transition temperature of these solvent-free electrolytes was measured and found to be dependent on the content of quaternary ammonium side groups anchored to the polysiloxane backbone. The influence of quaternary ammonium group content and temperature on the ionic conductivity has been investigated. A maximum conductivity of 1.57 × 10⁻⁵ S cm⁻¹ at 25 °C was achieved for a poiysiloxane containing 30 % quaternary ammonium side groups. The temperature dependence of the ionic conductivity shows the “Vogel-Tammann-Fulcher” (VTF) behavior. The values of the VTF Parameters were calculated. Rcceived: 24 June 2002/Revised version: 19 August 2002/ Accepted: 22 August 2002 Correspondence to Shibi Fang     

Face detection by structural models

Despite the successes in the last two decades, the state-of-the-art face detectors still have problems in dealing with images in the wild due to large appearance variations. Instead of leaving appearance variations directly to statistical learning algorithms, we propose a hierarchical part based structural model to explicitly capture them. The model enables part subtype option to handle local appearance variations such as closed and open month, and part deformation to capture the global appearance variations such as pose and expression. In detection, candidate window is fitted to the structural model to infer the part location and part subtype, and detection score is then computed based on the fitted configuration. In this way, the influence of appearance variation is reduced. Besides the face model, we exploit the co-occurrence between face and body, which helps to handle large variations, such as heavy occlusions, to further boost the face detection performance. We present a phrase based representation for body detection, and propose a structural context model to jointly encode the outputs of face detector and body detector. Benefit from the rich structural face and body information, as well as the discriminative structural learning algorithm, our method achieves state-of-the-art performance on FDDB, AFW and a self-annotated dataset, under wide comparisons with commercial and academic methods.     

校车车身结构的有限元分析

建立某型校车的有限元模型,计算在不同工况下其车身骨架的静态强度.计算结果表明:在弯曲和扭转工况下,该校车最大应力分别为154.8和171.4 MPa,均小于Q235屈服应力235 MPa;最大变形分别为4.925和12.92 mm,满足《客车定型试验规程(GB/T 13043—2006)》中所规定的弯曲和扭转工况下10及12 mm的限额;车身结构整体应力大多集中在30 MPa左右,有较大的安全裕度.分析结果可为该校车车身骨架结构优化提供参考.     

聚天冬氨酸的合成与表征

以L-天冬氨酸为原料,热缩合成聚天冬氨酸酐,水解得到聚天冬氨酸。采用凝胶色谱法(GPC)测定了聚天冬氨酸的分子量,并用核磁共振(NMR)对其进行了表征。     

Synthesis of carbon nanocapsules containing Fe, Ni or Co by arc discharge in aqueous solution

A simple, inexpensive and one-step synthesis method of metal-containing carbon nanocapsules using an arc discharge in aqueous solution is reported. It was found that Ni, Co and Fe nanoparticles could be in situ encapsulated in carbon shells when the arc was performed respectively in aqueous solutions of NiSO₄, CoSO₄ and FeSO₄. Transmission electron microscopy, energy dispersive X-ray spectroscopy and electron diffraction patterns of selected areas were used to determine the crystalline phase of the metal cores. To explain the formation mechanism of metal-containing carbon nanocapsules, a model of discharge in solution is proposed. This result presents a simply controllable way to synthesize metal-containing carbon nanocapsules.     

建筑电气设计中消防防火审核探讨

防火审核是建筑电气设计审核中的一个重要组成部分,要严格按照相关的防火规范设计和审核其设计,为建筑安全打下坚实的基础。分析、探讨了电气系统设计中防火审核的方法和相关技术,并提出了相关的设计对策和建议,以期能为相关人员提供参考。     

服务于教学实践和创业实训的校园电子商务模式研究

将电子商务引入校园生活,可以很好地突破时间和空间的限制,最大限度地发挥其优势,给校园师生提供方便。我国的校园电子商务目前只处于起步阶段,这方面的研究也比较少。本文在分析国内高校电子商务教学和创业教育存在的主要问题基础上,对我国高校的校园电子商务常见模式进行归纳、分析和比较,并结合我校的实际优势,提出一种服务于教学实践和创业实训的校园电子商务模式并加以介绍。     

静压支承技术在海水淡化旋转式能量回收装置中的应用

海水淡化旋转式能量回收装置（RERD）高、低压流体间的泄漏主要在转子与端盘的配合间隙中发生，这种泄漏直接影响到装置的能量回收效率水平。本文通过在平面端盘上引入阻尼孔和静压支承槽，构建了静压支承端盘方案，将静压支承技术应用到自主开发的电驱RERD装置中，以解决其运行过程中泄漏量大、能量回收效率低等问题。在转子与上、下端盘配合总间隙为0.04mm、转子转速为500r/min的条件下，RERD分别使用平面端盘和静压支承端盘进行对比实验研究。结果表明，在操作压力为4.5MPa和处理量为13m³/h的工况下，与平面端盘相比，采用1^#静压支承端盘（静压支承槽槽宽为2.0mm）时，装置的泄漏量从0.45m³/h减小至0.28m³/h，能量回收效率从91.3%提升至92.7%。采用2^#静压支承端盘（静压支承槽槽宽为3.0mm）的RERD在相同工况下，装置的泄漏量可降低至0.11m³/h，能量回收效率提升到95.0%。上述研究显示静压支承技术对于减小RERD装置泄漏量、提高装置效率具有显著的效果，对RERD装置密封结构设计与优化具有指导意义。