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异步时序设计亚稳态的消除方法

提出一种基于异步比较法产生空满标志位，并利用锁存器实现标志位与时钟同步的FIFO，同时还给出了相应的Verilog HDL代码。该方法能提高时钟频率,节约版图面积。     

花生四烯酸调控网络在贻贝麻痹性贝毒代谢中的作用基于转录组和代谢组联合分析

紫贻贝（Mytilus galloprovincialis）是富集麻痹性贝类毒素（Paralytic Shellfish Toxins, PSTs）能力很强的代表性双壳贝类,但研究表明紫贻贝暴露于PSTs也会引起机体炎症反应,其作用机理及对毒素代谢影响尚不清楚。本研究采用转录组学与代谢组学联合分析技术,比较了产PSTs的链状亚历山大藻（Alexandrium catenella）暴发的不同时期,紫贻贝机体的基因表达量与代谢物含量差异,以解析PSTs胁迫下紫贻贝机体的炎症反应机制。结果表明,紫贻贝暴露于PSTs后表达的基因和代谢物均发生显著变化,其中差异表达基因17232个,差异代谢物341个。基于联合分析,差异表达基因与差异代谢物显著富集在花生四烯酸和谷胱甘肽代谢通路中,基因PLA2G2F、ALOX5、TBXAS1以及代谢物ARA、PGH₂、TXA₂、LTA₄、5-HETE对贻贝机体的促炎反应发挥重要作用;而基因GPX4、CYP2J2和代谢物15-HETE、GSH则调节机体炎症的消退。本研究揭示花生四烯酸相关通路在贻贝机体炎症反应过程中具有重要的调控作用,为下一步深度揭示PSTs胁迫下贻贝机体炎症网络化响应机制提供了研究基础。     

我国低硒带典型景观植物硒的研究

本研究在我国低硒带的东北端和西南端分别选取了针阔叶混交林景观和云南松林景观,并且在低硒带内的克山病和大骨节病非病区与东南非病带选取了落叶阔叶林景观和马尾松林景观为对照景观,系统地采集了上述各不同景观的主要植物和土壤,对硒进行了分析。结果发现,在我国低硒带的东北瑞和西南瑞景观的主要植物含硒量显著地低于对照景观,同时景观内土壤硒也明显地低于划分我国低硒生态景观的阈值,从天然植物的角度进一步对我国低硒带客观存在这一科学论断进行了补充。     

Quantitatively analyze the impact of land use/land cover change on annual runoff decrease

Annual runoff in Luanhe river basin was detected a downward trend and caused water crisis in Tianjin, China. To quantify the decreased runoff volume, Mann–Kendall test and Pettitt test were employed to check whether there existed significant trend and change points for annual rainfall and runoff time series in Panjiakou reservoir basin and 8 sub-watersheds. It was found that the annual runoff time series had a significant downward trend at 5 % confidence level, and the change point was at 1979 in Panjiakou reservoir watershed. Then double mass curve of annual rainfall and annual runoff was plotted, and two lines were fitted before and after 1979, respectively. Based on this method, the comprehensive effects of land use/land cover change on annual runoff were estimated. To further quantify the contributions of each main factor to annual runoff decrease, water stored in check dams and social water use in different periods were surveyed first. And then multi-linear regression was used to develop the relations between annual runoff and the driven factors. Water area decrease was identified to be the main factor contributing to annual runoff reduction. The results in this study can provide valuable information for water resources planners and policy makers.     

吉林省延边地区造山型金矿地球物理特征及找矿方向研究——以海沟金矿为例

夹皮沟-海沟-金城洞构造岩浆（杂岩）带为吉林省重要的金成矿区带,海沟金矿位于该构造岩浆（杂岩）带的中部,其经过古生代和中生代多期岩浆平行贯入与早晚不同性质断裂（韧性与脆性）以及不同样式构造（环形、弧形与线性）的叠加混合,这些地质事件与金矿成矿关系极其复杂。同时,海沟金矿深部成矿预测也已成为当务之急。笔者试图通过地球物理方法,如磁法、重力、可控源音频大地电磁法剖面分析对应分析海沟金矿表层-浅部、中部以及深部地球物理场异常特征。由于海沟金矿表层及浅成控矿构造为韧-脆性构造转换部位和脆性构造,中层控矿构造指受绿片岩相韧性剪切带控矿,深层控矿构造主要为受角闪岩相韧性剪切。因此,不同深度地球物理场特征是控制金矿鉴别标志。磁低缓正异常中局部高异常尖峰定位层及浅成控矿构造,重力正负异常梯度带定位中层成控矿构造,陡峭低阻异常带定位深部控矿构造。由深至浅的控矿构造反映出大陆张裂、隆-滑和拆离构造等多种大陆壳动力学机制转变过程中的地球物理场特征的变化。最后通过对比典型金矿带地球物理特征,对深部及外围是否存在该类型金矿床进行预测。     

湘南铜山岭铜多金属矿床成矿物质来源的 S、Pb、C同位素约束

铜山岭铜多金属矿床是湘南W、Sn、Pb、Zn、Cu多金属矿集区的代表性矿床,本文对其不同类型岩石和矿石矿物进行了S、Pb、C同位素组成对比研究。矿石硫化物的δ34 S值变化范围为-1.9‰~5.7‰,平均值为2.6‰,硫主要来源于硫同位素组成均一化的岩浆。硫化物硫同位素平衡温度表明,矿床主要成矿温度为134~339℃。矿石铅的206 Pb/204 Pb、207 Pb/204 Pb、208 Pb/204 Pb比值分别为18.256~18.856、15.726~15.877、38.352~39.430;岩体岩石铅的206Pb/204Pb、207Pb/204Pb、208Pb/204Pb比值分别为18.617~18.805、15.721~15.786、38.923~39.073;两者铅同位素组成相同,都主要为上地壳铅,是由同一岩浆体系分异形成,可能来源于古老基底岩石。不同类型岩石、方解石矿物的δ13 CPDB值为-9.88‰~1.32‰,δ18 OSMOW值为11.67‰~17.68‰,从矽卡岩矿体到距岩体稍远的围岩地层,方解石矿物的δ13 CPDB、δ18 OSMOW值逐渐增大,成矿流体中的碳早期可能主要来源于岩浆,在成矿过程中有部分碳酸盐岩地层碳的加入。铜山岭矿床成矿物质主要来源于岩浆,赋矿地层对矿床成矿物质来源作用不显著,仅提供了少量成矿物质。     

南流江中上游毛蟹调查初报

对北部湾南流江水系的日本绒螯蟹合浦亚种(Eriocheir japonicus hepu ensis Dai 1900)的形态特征、生态习性、分布状况、捕捞运输、经济价值、资源利用作了阐述,并对如何加强资源保护提出4点建议。     

用X射线光谱法测定锰的X射线发射谱的细结构及锰的价态分析

在普通的ＸＲＦ光谱仪上测定金属锰，氧化锰、锰的化合物中ＭｎＫβ发射谱带，经谱数据处理获得了谱线的轮廓线及谱峰参数（峰位，峰高，峰宽，峰宽，峰函数比例因子，不对称因子）；研究了谱参数与价态间的关系。结果表明ＭｎＫβ谱带结构与化合价，氧化数，化学键及配位状况有关，利用所得出的规律对太平洋锰结核的价态作了定性测定，并用谱峰分解法对Ｍｎ３Ｏ４试样进行化学价态定量分析的浓度量，得到满意的结果。     

Seismic response of a four-storey RC school building with masonry-infilled walls

This paper focuses on the evaluation of the effect of masonry-infilled walls on the seismic response of a four-storey RC school building. Numerical simulation is presented with respect to the building with and without masonry-infilled walls. The simulation employed force-based fibre elements for beams and columns, and a single equivalent diagonal strut to represent the masonry infill. The numerical model was verified through comparison with shake table test results. It was found that the presence of masonry-infilled walls has significant influence on the global response of the structure. Although the displacement of the structure with infilled wall is reduced in the in-plane direction, it was increased in both in-plane and out-of-plane directions when the infilled walls experienced loss in serviceability.