输气管道水化物堵塞的预防和处理

阐述了输气管道内水化物的成因，特性及游离水的来源，并对其进行了分析，根据分析结果，给出了预测管道内水化物形成区域的方法，提出了三项预防水化物的措施，（1）施工阶段避免过多使用弯管，（2）投产前增加吹扫次数，彻底清除水，（3）运行初期定期注入抑制剂，指出对已形成水化物的管道段，可采取尽快降低运行压力，加热，注醇和放空等措施进行处理。     

原发性纵隔肿瘤及囊肿71例分析(附1例罕见胸腺瘤并发症)

71例原发于纵隔的肿瘤及囊肿,其中胸腺瘤占35.2％,畸胎瘤占23.9％,神经源性肿瘤占18.2％,其他肿瘤占22.7％。三类常见肿瘤中,以胸腺瘤恶性率最高(32％),神经源性肿瘤次之(15.4％),畸胎瘤无1例恶性。术前正确诊断25例,未能分类25例,误诊21例。本文分析了误诊原因。此外,报道1例罕见的胸腺瘤并发症。     

真空化学热处理多用炉的研究

A new type of versatile vacuum electric furnace for chemical heat treatment is developed, in which the low vacuum structure heating outside, the NH_3 auto-disintegrating instrument, the technology of ultra-red heating, TTL automation and the diverse distr     

负刚度的工作原理及应用初探

This paper deals with the vibration isolation principle of a system with a negative stiffness spring and the energy analysis for this system.As an application of the method, an example of vibration systems with equal frequencies is given. It shows that th     

汽提污水中有机物的GC／MS分析

应用了ＧＣ／ＭＳ方法分析炼油厂汽提污水中的有机物，其结果可作为实用除油技术的依据。     

线性规划模型在农村能源建设中的运用

本文分析了线性规划模型在农村能源开发利用中运用的必要性和可行性。系统阐述了如何将农村能源多元结构的优化问题表达为线性规划数学模型，并以四川米易县农村能源开发利用优化设计为例进行了分析求解。     

钻头磨损在线监测研究

本文研究了钻头磨损对钻削过程中振动加速度信号的动态特性的影响。发现加速度信号中敏感频率分量随着钻头磨损的增加呈明显的“碟形”规律变化。我们提出用敏感频率分量的自功率谱值(PSD)作为特征量。建立了特征量与钻孔数之间的状态空间方程;提出了钻头磨损在线自适应监测方法。该方法打破了故障诊断和状态识别中设置“阈值”的传统做法;另辟蹊径。     

AN OBSERVATION STUDY ON BIOLOGICAL CHARACTERS AND MATING BEHAVIOR OF DAHURIAN CASEBEARER(COLEOPHORA DAHURICA FLKV.)ADULTS

Through rearing tests and observations under laboratory conditions,biologicalcharacters and mating behavior of Dahurian casebearer(Coleophora dahurica Flkv.)adultswere studied in this paper.Results discovered that the time of emergense of male adultswas 24h to 36h earlier than that of female adults.The peak of sex pheromone secretion ofthe female adults appeared of 24h to 42h after the emergence.The reaction of male adultson the sex pheromone was most sensitive during 30h to 48h after emerged,so the earlieremergence of the male adults was favorable to mating.The phenomenon of repeatedmating did not exist in female adults,but the male adults could mate for several times,with maximum of 4 times.There was a definite behavioral reaction during the matingperiod of male and female adults,and the certain period of feeding and mating times couldaffect the adults longervity to a certain degree.     

广义连续格的结构

以上（下）子格为工具建立广义连续格的诸结构定理，它们奠定这些格的完全链表现的基础。     

提高中锰白口铸铁韧性的研究

为改善中锰白口铸铁的韧性以扩大其应用范围,本文探讨了C, Si, Mn等合金元素、变质处理和热处理工艺对中Mn白口铸铁组织和性能的影响.