浅谈我国未来循环经济的发展与战略选择

循环经济是一种新兴的物尽其用的经济发展模式,它强调资源的再使用和再循环。实行循环经济是保障工业企业可持续发展的客观需要,也是实施可持续发展战略的重要途径和实现方式。 更多还原     

What is the matter with Corbicula fluminea (Mollusca: Bivalvia: Cyrenidiae)? Occurrence of unusual shell erosion in Northern Italy

ABSTRACT

Corbicula fluminea is a bivalve considered to be among the 100 worst invasive species in Europe due to its economic and ecological impacts in freshwater ecosystems. Here, we report for the first time a phenomenon of shell erosion observed in two distinct populations of C. fluminea collected in 2015 from two semi-natural small streams of the River Ticino hydrographic basin (Northern Italy). We measured several biometric variables in order to quantify the shell damage: length and thickness of the right valve and the shell free dry weight of each specimen and compared results with those of ‘normal’ populations from another stream of the same area. Our results confirmed that there was abnormal shell erosion and a reduction in shell thickness in both populations. We hypothesised several potential causes for the observed erosion, but none of them could provide sufficient explanation: neither the pH of the water, nor the level of calcium or total hardness of the water or granulometry of the substrates differed among streams. Similarly, predation pressure cannot be considered a reasonable explanation, since in the study area only a few animals actively prey on these bivalves and the marks they leave on the shells are completely different from the ones observed on our specimens. Lastly, we hypothesised that the bivalves may have been affected by a disease or parasitic infestation that had weakened their shells or prevented them from self-repairing and identified a fungal parasite that could possibly cause a disease to C. fluminea, namely the Ascomycota Geotrichum candidum. However, this species occurred only in one of the two abnormally eroded populations. In conclusion, a valid explanation for the morphological alteration that our study revealed has yet to be found.     

超重核区的双幻性质研究

应用V-S公式、连续介质模型和Strutinsky壳修正能量理论计算结果，对SHEs区的核素进行α衰变能及寿命、基态形状及其变化和壳能级结构进行了研究。并对各种理论模型计算结果进行比较分析，认为298114最有可能成为超重核中唯一的球形双幻核。     

金刚石薄膜场致发射的研究

简要分析了 FED场发射显示器的工作原理 ,陈述了非晶金刚石薄膜特殊的优点后 ,对用金刚石薄膜制作场发射器的可行性进行了讨论 ;还介绍了利用金刚石薄膜和阳极选择的方法对Spindt FED作了改进 ,从而使平面 FED更容易实现。     

CPMS类产业的循环经济模式

针对我国铁合金、轻金属和非金属类产业(简称CPMS类产业)资源和能源消耗大、环境污染严重、产品市场竞争力不强的实际情况,分析了该类产业生产过程中高附加值尾气的组成,讨论了其回收、利用途径,提出了该类产业的循环经济发展模式,形成能源、资源—CPMS类产品—尾气—化工产品(电)多联产循环产业链,使我国这类产业走上低能耗、高产出、无污染的绿色科技创新之路并实现可持续发展。     

On a kind of biharmonic boundary value problems related to clamped elastic thin plates

By using complex variable methods, the boundary value problem for biharmonic functions arisen from the theory of clamped elastic thin plate is shown to be equivalent to the first fundamental problem in plane elasticity which, as well-known, may be easily solved by reduction to a Fredholm integral equation. The case of circular plate is illustrated in detail, the solution of which is obtained in closed form. Foundation item: Supported by the National Natural Science Foundation of China (No. 19871064) Biography: LU Jian-ke(1922-), male, Professor. Research interests are in applications of complex variables.     

ISG法制备钙钛矿纳米陶瓷薄膜

采用ＥＳＧ法合成钙钛矿稀土复合氧化物ＬａＭＯ３（Ｍｘ为Ｎｉ＾３＋、Ｃｏ＾３＋或Ｆｅ＾３＋）纳米陶瓷薄膜，研究了ｐＨ值对柠檬酸与Ｌａ＾３＋和Ｍ离子络合的影响及 合方式对形成ＬａＭＯ３的作用，发现ＬａＭＯ３前驱体凝胶膜对形成陶瓷薄膜有很大影响，慢的干燥速度、预处理温度与烧成温度，慢的干燥速度、预处理温度与烧成温度均有利于形成良好的陶瓷薄膜。     

带Fuzzy外壳和Boole心脏的险象识别逻辑

结合新近发展起来的Ｆｕｚｚｙ命题逻辑的思想和组合线路险象识别技术的背景，改造Ｇｏｅｄｅｌ蕴算子和公式代数的赋值格，构造了另一种带Ｆｕｚｚｙ外壳和Ｂｏｏｌｅ心脏的险象识别逻辑，对其进行了语义地研究，得到了若干有趣的结果。     

高剥离态离子nl壳层的能量计算

采用改进的屏蔽氢离子模型计算高剥离态离子的ｎｌ壳层能量，并与实验值及其他理论值进行了比较。     

超薄型银灰色反光地膜生产工艺研究

论述了超薄型银灰色反光地膜的生产工艺过程，采用正交法试验，得到了最佳的工艺参数，生产出厚度为 ０．００８ ｍ ｍ的超薄型银灰色反光地膜，并保持了与厚度为０．０２５ ｍ ｍ 的同类薄膜的物理机械性能及生产过程的稳定成膜性。由此初步探索和总结了聚烯烃类塑料薄膜生产过程中的金属色着色工艺方法。