绝对的光子能量与相对的原子势能

以选取不同零势点为例，认真分析了原子内能及弹性势能的基本特性，用简单明晰的实例证明了势能是相对的，而释放光子的能量是绝对的。     

中小型软件企业产学合作模式探索

本文首先分析了我国中小型软件企业人才储备的主要途径和中小型软件企业人才陷阱的主要表现,进而提出企业摆脱人才陷阱的有效方法就是同高校合作培养软件人才,建立企业自己的人才储备基地,实现企业和高等院校的双赢,最后以一些案例展示了这种双赢模式存在的必然性和有效性。     

桥梁施工技术及裂缝成因分析

近年来,统观桥梁运行情况,有一些桥梁会出现或多或少的质量病害,重点表现为桥梁裂缝,其严重威胁着车辆的安全通行与桥梁的使用寿命。论文针对桥梁裂缝的种类,分析了桥梁施工技术与桥梁裂缝形成的原因,提出了有效防范桥梁裂缝的措施。     

冲绳海槽中段沉积岩芯的氧碳同位素测定和YD事件

In this paper, the determination and analysis of oxygen and carbon isotopes were carded out on 155 core and 180 core respectively. These data provides us with a fundamental understanding of the paleotemperature and paleoenvironmental evolution features and climate-stratigraphic classification of central Okinawa Trough since the late-glacial.     

Sediment provenance discrimination in northern Okinawa Trough during the last 24 ka and paleoenvironmental implication:rare earth elements evidence

Rare earth elements(REE) compositions and discriminant function were successfully used to examine high resolution sediment source changes in the northern Okinawa Trough over the last 24.1 ka,especially for the influence from the Yellow River and the Tsushima Warm Current(TWC) that has not been well solved.Variations of these parameters were clearly divided into three distinct depositional units.During Interval 1(24.1-16.0 ka BP),the paleo-Yellow River and the paleo-Yangtze River mouths were situated near the studied area and could have played major roles in the sedimentation therein.In Interval 2(16.0-7.3 ka BP),these river mouths gradually retreated with global sea-level rise,leading to less fluvial inputs from them to the northern Okinawa Trough.Meanwhile,formation of the TWC could carry some sediment loads of Taiwan to the studied core,especially during its late phase(8.0-7.3 ka BP).Modern oceanographic conditions,with a predominance of the TWC,were finally established since the beginning of Interval 3,causing more terrigenous contribution from Taiwan to the studied area.Sub-sequently,modern depositional environments mainly influenced by the Yellow River,the Yangtze River,and the TWC were finally formed.     

箱涵在小型水利工程中的应用探讨

箱涵是一种钢筋混凝土结构建筑物,由于具有型式简单、结构稳定、造价经济、施工简便等优势,所以在城市供排水、交通、防洪等小型水利工程中应用较为广泛。文章对箱涵结构型式过流能力计算进行了总结与梳理,并对箱涵尺寸、荷载、内力、配筋设计等进行了探讨,为小型水利工程中箱涵结构型式的设计提供了指导。     

简述美拉德反应

综述美拉德反应的概念、反应机理、反应的影响因素、控制反应的条件及其在食品工业上的应用。     

一种舰船发射系统用特种同轴电缆的设计探讨

本文主要探讨一种舰船发射系统用同轴电缆的设计,根据用户实际使用的特殊情况,设计出大拉力、反复收放、低损耗、重量轻的特种铠装同轴电缆.在该电缆的设计过程中,不仅要考虑电缆的传输性能,还要考虑到使用空间非常小以及应用中处于反复收放状态,在8mm的直径内满足1000kg的拉力和反复收放的要求电缆设计是否可以成功的关键.     

Rare earth element geochemistry in the inner shelf of the East China Sea and its implication to sediment provenances

Gravity core EC2005, located in the mud wedge off the Zhejiang-Fujian coast in the inner shelf of the East China Sea (ECS), was analyzed for its lithology, grain size, rare earth elements (REE) and AMS14C dating. Results revealed high-resolution paleoenvironmental evolution and multiple switches of sediment provenances in the inner shelf of ECS. The lithology, grain size and REE concentrations of sediments varied significantly down the core. Mean grain size ranged from 8 to 121 μm, and the values of ΣREE were 152.8-227.9 μg/g. The chondrite- and shale-normalized REE patterns indicated their similarity to the terrigenous sediments in the study area. Between 17.3-12.3 ka BP the sediments in the inner shelf of ECS were mainly originated from local drainage basins. The source then gradually switched to the Yangtze River between 12.3 and 9.8 ka BP. Since about 10-9.8 ka BP, the sediments in the study area were dominantly derived from the Yangtze River. The continuous rising of sea level and formation of coastal current along the inner shelf played a key role in the switches of sediment provenances.