XH－11型胶粘剂最佳固化工艺的研究

本文对ＸＨ－１１型胶粘剂的固化工艺参数进行了试验研究，确定了主要几个参数值，以达到最佳固化工效果。     

从煤矸石制取氯化铝联产橡胶填料的研究

在实验室小试、中试装置上进行了从煤矸石制取氯化铝联产橡胶填料的研究，考察了煤矸石性质、工艺条件等对产品质量的影响，结果发现最佳工艺参数为焙烧温度６００～ｑ００℃．焙烧时间为１５～９０ｍｉｎ．焙烧温度对产品质量影响更为显著，制得结晶氯化铝产品质量达到合格品标准，填料用作橡胶制品填充剂具有较好补强与抗曲性能，其胶片的物理机械性能达到普通橡胶板标准。     

高性能化改性酚醛树脂的研究进展

综述酚醛树脂的增韧和耐热改性的新方法。介绍采用聚砜、聚酰胺、腰果壳油／双马来酰亚胺、橡胶、环氧树脂及聚乙烯醇等改进酚醛树脂的韧性；采用碳纳米管、纳米蒙脱土、双马来酰亚胺、硼元素、焦油、有机硅、苯并恶嗪及酚三嗪树脂改进酚醛树脂的耐热性。     

硫铁矿沸腾炉掺烧含硫化氢酸性气体的研究

对合成氨装置排出的酸性气体掺入硫铁矿在沸腾炉内燃烧进行了试验研究，酸性气体φ（H2S）约31．8％，φ（CO2）约68％，掺烧试验结果表明，在正常的操作条件下，硫化氢燃烧生成二氧化硫的反应相当迅速和完全，通过调节投矿量沸腾炉可以适应硫化氢气体浓度和流量的变化，生产出符合硫酸生产的原料气，因此在硫铁矿中掺烧含硫化氢的酸性气体是可行的，建议在工业生产中，由沸腾炉的扩大层加入酸性气体，这样可防止泄漏，避免出气孔堵塞，并且可通过调节二次风量控制硫化氢气体的燃烧。     

直叶H型潮流水轮机三维数值模拟

为了探究直叶H型潮流水轮机水动力性能的影响因素,在理论分析的基础上,应用大型建模软件UG建立了直叶H型潮流水轮机三维模型,基于滑移网格技术采用Fluent软件对水轮机模型进行三维数值模拟,在保持直叶H型潮流水轮机叶片翼型一定、水轮机密实度相同的条件下,通过改变转轮叶片数以及来流速度,分析了潮流水轮机水动力性能。结果表明,叶片数对直叶H型潮流水轮机水动力性能影响很大,叶片数越多,输出扭矩值越小,当叶片数为3、叶尖速比为1.63时,水轮机最高获能系数为31.21%。     

LTE承载网解决方案研究

分析了LTE的业务特点和承载需求,详细描述了L2VPN＋CE和L2VPN＋L3VPN方案的实现方式,相比于L2VPN＋CE方案,L2VPN＋L3VPN方案在PTN设备上集成简化L3功能实现端到端的IP化LTE承载,具有明显的优势。     

A study of hydrogel thermal-dynamics using Fourier transform infrared spectrometer

A rapid and reliable method was presented for studying hydrogel dynamics/kinetics. Two temperature-sensitive hydrogels, poly-N-isopropylacrylamide (poly(NIPAAm)) and the copolymer of N,N-diethylacrylamide and sodium methacrylate (molar ratio=97:3, poly(NDEAAm-co-MAA)) were synthesized. The thermal-behaviors of the gels were studied through the absorbance intensities of both swollen water and gel frame components, and the peak positions of amide band along heating/cooling pathways under dynamic Fourier transform infrared (FTIR) probing. The results showed that the lower critical solution temperature (LCST) of poly(NIPAAm) is about 33-35 °C, which is consistent with reported value of ∼34 °C. Compared to poly(NIPAAm), poly(NDEAAm-co-MAA) has relatively continuous volume phase transition, starting at ∼35 °C and a better thermal-reversibility with similar swelling and deswelling profiles over a larger temperature range (10-80 °C for poly(NDEAAm-co-MAA) vs. 10-33 °C for poly(NIPAAm)). The H-bonding water along phase transition was also studied, showing a less reversibility of poly(NIPAAm) compared to poly(NDEAAm-co-MAA). In addition, FTIR spectrometer was also used to study the volume changes of poly(NDEAAm-co-MAA) under variations in environmental salinity.     

Thermoelectric properties of Ca3Co4O9 ceramics

Ca₃Co₄O₉ ceramics were prepared using the sol-gel process with ordinary pressing sintering and their thermoelectric properties were measured from room temperature to 673 K. The experimental results show that single phase Ca₃Co₄O₉ can be fabricated at 750–900 °C in different citrate acid molar proportions for 0.2–1.0. For all the oxides, both the Seebeck coefficients S and the electrical conductivities κ increase with the increasing temperature. The Seebeck coefficients S are all positive. The thermal conductivities k increase with the increasing temperature also and the lattice thermal conductivity κ _l plays an important role to the thermal conductivity κ. The citrate acid molar proportions have a large influence on the particle sizes, which influences the thermoelectric properties of the ceramics. The figure of merit increases with the increasing temperature and reaches 4.5×10⁻⁵ K⁻¹ at 573 K for the sample in the citrate acid molar proportion of 0.46.     

大场景视频监控下大坝运输车改进多目标多视觉卸料识别模型研究

运输车卸料识别对保障大坝施工安全、优化运输配置具有重要意义。然而,大坝施工中多采用全球导航卫星系统（Global Navigation Satellite System,GNSS）进行运输车活动状态分析,存在设备成本高、识别精度低等缺点。目前,通过布设高清摄像头进行坝面大场景施工监控成为趋势,但尚未见基于机器视觉的运输车卸料识别研究。针对上述问题,提出大场景视频监控下大坝施工运输车卸料识别改进多目标多视觉任务模型。首先,采用ByteTrack实现大场景监控视频中多辆运输车目标检测与追踪,记录其行驶轨迹;其次,High Resolution Net（HRNet）被用于运输车头部和尾部的关键点检测,进而结合行驶轨迹判断运输车前进、停止和后退等行进状态;再者,通过Destruction and Construction Learning(DCL)细粒度分类方法判断运输车料斗的抬升状态;最后,结合ByteTrack、HRNet和DCL的多目标多视觉任务的分析结果判定运输车卸料状态。以两河口施工视频监控为例进行验证,提出的卸料识别模型在34帧时卸料状态识别平均准确率为87.3%,卸料时间判断精度为90.3%,验证了本模型的可行性和有效性。     

西北地区农业干旱对气象干旱的时空多角度响应

采用标准化降水蒸散指数和标准化土壤水指数分别表征气象干旱和农业干旱,基于干旱事件三维识别和气象干旱与农业干旱事件对的匹配结果,利用Copula函数条件概率分布和贝叶斯网络概率模型分析了西北地区农业干旱对气象干旱的时空多角度响应关系。结果表明：基于线性、非线性关系模型及Copula函数条件概率分布确立了西北地区农业干旱对气象干旱的干旱历时、干旱烈度、干旱面积及干旱迁移距离间最优响应关系分别为二次多项式模型、基于Frank Copula函数的非线性关系模型、指数模型和线性模型;建立的气象、农业干旱变量间的响应概率特征曲线可定量预测西北地区不同程度的气象干旱发展为农业干旱的概率;已知气象干旱特征条件下,根据最优响应关系及响应概率特征曲线可对农业干旱特征及其发生概率进行可靠预测。