气体燃料燃烧强化和污染控制的分析与探讨

本篇通过燃气燃烧特性的分析，指出了强化燃烧的措施，并通过燃气燃烧污染因素的分析，指出了污染控制的措施。     

厂校结合,搞好热能专业毕业设计

科学、合理地安排、实施好热能专业的毕业实习及设计,让学生把所学的专业理论知识与生产实际有机地结合起来,在实践中得到一次全面训练,对毕业后从事工业锅炉的运行管理和维修改造工作,具有极其重要的作用。可是,由于长期以来国家对能源问题重视不够,导致各厂、所企业的热能,特别是锅炉专业技术力量严重缺乏,管理水平落后,现场工作条件较差;近年来各企业实行承包责任制,工人及技术人员工作任务重,难以保证对下厂学生的实习和设计指导;而我们热能专业目前专业教师人员少,教学任务重,难以抽出专职带队老师。所以,热能专业的毕业实习安排上有相当大的难度。     

一种减轻再入通信中断现象的烧蚀防护材料

一、研制背景美国从五十年代末起,就注意到飞行器高速再入大气层时存在着通信中断现象。如双人驾驶的宇宙飞船“双子星座号”在再入时遥测信号中断3～4分钟,它的再入速度高达21.5M~*;登月宇宙飞船“阿波罗号”(有三名宇航员)在再入时中断了7～11分钟,它的再入速度高达32.4M~*;“哥伦比     

普通车床软轴自动车锥面装置

在普通车床上车制内外锥面时,一般都是按锥度要求,将小刀架搬好角度,用手转动小刀架手柄,使小刀架走刀,车出锥面。这种方法效率低、质量不易保证、劳动强度较大,车削长锥面时,尤为显著。针对这种情况,我们     

美、苏研制机动弹头近况

《詹氏防务周刊》1985年1月19日报道:据美国情报部门提供的消息:五角大楼正在研究未来可能实现的各种系统,其中包括先进战略导弹系统(ASMS)计划中的机动再入弹头。为了对付苏联可能的反弹道导弹防御,及在未来攻击苏联超级加固的关键指挥中心,五角大楼认为,继续研究机动弹头是深谋远虑的行动。美国将利用研制 Mk500弹头和试验高级机动再入弹头(AMA-RV)所取得的经验来制订这项研究计划。海军研制的 Mk 500是用于近期作战时代替“三叉戟”I的 Mk4弹头的,以躲避反弹道     

用到达时间与速度测量值估算弹道

该文给出了利用到达时间和速度(多卜勒)估算目标弹道的方法。也就是不通过求导而直接得到弹道估值——位置和速度。选取相应的权值可以调整弹道的平滑性。对测量误差造成的弹道统计误差进行了分析。还给出了一种用FORTRAN77编制的程序。     

Spherule beds 3.47-3.24 billion years old in the Barberton Greenstone Belt,South Africa: a record of large meteorite impacts and their influence on early crustal and biological evolution

Four layers, S1-S4, containing sand-sized spherical particles formed as a result of large meteorite impacts, occur in 3.47-3.24 Ga rocks of the Barberton Greenstone Belt, South Africa. Ir levels in S3 and S4 locally equal or exceed chondritic values but in other sections are at or only slightly above background. Most spherules are inferred to have formed by condensation of impact-produced rock vapor clouds, although some may represent ballistically ejected liquid droplets. Extreme Ir abundances and heterogeneity may reflect element fractionation during spherule formation, hydraulic fractionation during deposition, and/or diagenetic and metasomatic processes. Deposition of S1, S2, and S3 was widely influenced by waves and/or currents interpreted to represent impact-generated tsunamis, and S1 and S2 show multiple graded layers indicating the passage of two or more wave trains. These tsunamis may have promoted mixing within a globally stratified ocean, enriching surface waters in nutrients for biological communities. S2 and S3 mark the transition from the 300-million-year-long Onverwacht stage of predominantly basaltic and komatiitic volcanism to the late orogenic stage of greenstone belt evolution, suggesting that regional and possibly global tectonic reorganization resulted from these large impacts. These beds provide the oldest known direct record of terrestrial impacts and an opportunity to explore their influence on early life, crust, ocean, and atmosphere. The apparent presence of impact clusters at 3.26-3.24 Ga and approximately 2.65-2.5 Ga suggests either spikes in impact rates during the Archean or that the entire Archean was characterized by terrestrial impact rates above those currently estimated from the lunar cratering record.     

对RLC串联电路中通频带与RLC参数关系的讨论——从一道习题引起的问题

讨论了RLC串联电路中通频带与RLC参数的关系,说明在设计一个RLC串联谐振电路时,在给定谐振频率,电感量和频带宽度时,上下边界频率不能只满足通频带宽度而任意假定,还应满足通频带与RLC这些参数之间关系的表达式.     

在强地磁活动期间热层大气成份和密度的变化

选用了１９７４－０７－０６,１９８２－０３－０２和１９８２－０９－０６三次强地磁活动时的Ａｐ值,由ＡＥ－Ｃ和ＤＥ－Ｂ卫星所测得的热层成份数据,进行统计分析,结果表明;在强地磁活动期间,热层大气密度涨落变化十分清晰、涨幅随高度增高而增大,高度６００ｋｍ附近涨幅可直达４倍,热层大气成份中Ｎ２的数密度涨幅最大,而原子氧的丰度在强地磁活动期间明显地下降。