应用时空变—倾角扫描叠加KL变换提高地震资料信噪比

使用KL变换可去除地震资料中随机噪声和相干噪声，提高地震资料信噪比。但常规KL变换仅能加强水平方向同相轴，对倾斜或弯曲同相轴处理效果较差，且在处理大量数据时计算成本很高，在实际生产中难以广泛应用。一些文献中针对常规KL变换的两个缺陷进行了改进，即使用倾角扫描叠加KL变换和采用数据分块技术。作者在本文中将这两个方面的改进有机地结合起来，提出应用时空变－倾角扫描叠加KL变换对地震资料进行处理，并指出使用该方法时需要注意的一些问题。理论模型和实际资料处理效果表明，使用本方法可以克服常规KL变换的缺陷，有效改进剖面处理效果。     

Strategies for Reducing Computing Time of Nuclear Waste Management Simulations Using the PORFLOW ™ Software

PORFLOW is a CFD software which is dedicated to groundwater flow and nuclear waste management simulations. PORFLOW is developed by the ACRi company located in Bel Air (California, USA) (http://www.acricfd.com) with a subsidiary in Sophia Antipolis (France) (http://www.acri.fr). In this paper, we report on our recent efforts to improve the performances of PORFLOW by focusing our attention on the solution of the large sparse linear systems resulting from the space and time discretizations of flow and transport equations. This work is illustrated by applying PORFLOW to the calculation of the COUPLEX1 and part of the COUPLEX2 problems.     

合肥市若干种疾病与气象条件关系的分析研究

通过调查2002～2004年安徽省合肥市第三人民医院入院的9 688例高血压、脑血管、心脏病、上呼吸道感染和慢性支气管炎病例,并与同期气象资料进行分析,发现有5种天气过程对以上疾病有较大影响.其中天气突变、低温阴雨、闷热、副高控制等天气系统影响是致病的外因;高血压和心脏病受季节性转换影响最明显;上呼吸道感染、慢性支气管炎在每年的8月、9月容易感染;脑血管疾病随时间变化较小.     

甘蔗不同熟期品种合理搭配与提高蔗糖分的关系

根据甘蔗不同熟期品种蔗糖分积累变化和高糖期出现迟早存在差异的特点，应用其积累动态模拟模型，探讨不同品种塔配形式与提高蔗糖分的关系，从理论上阐明早、中、晚熟品种合理搭配对延长高糖期和提高蔗糖分的作用，并给出品种搭配的求算原则和方法。为糖厂确定不同熟期品种的种植比例，提高经济效率提供指导依据。     

Environmental hazards in Xinjiang Line of New Eurasian Continental Bridge

Xinjiang Line of New Eurasian Continental Bridge is the important lifeline project inwestern China. Various disasters, such as flood, strong wind, sandstorm, and roadbed disasters,have been seriously affecting the railway transportation. The field investigation and analysis on thedata collected since 1959 show that: serious floods often occurred when the rain intensity reached25 mm/h or 30 mm/d; the critical wind speed for turning over a train is between 35 m/s and 67 m/s,and such cases happened in draught places of mountain opening and trunk valley; the angle be-tween wind direction and railway is closely related to the thickness of accumulative sand along thelines; roadbed disasters taking the form of side-slope sliding, roadbed sinking and silt turning uptook place in spring when the temperature rapidly rose to 10-15℃ from zero and precipitationcame forth or when the thickness of snow cover on shade slope reached above 20 cm in winter;the disasters taking place in the 1990s were far stronger than those of the 1980s and the order ofhazard intensity along the Xinjiang Line is Urumqi＞Shihezi＞Kuitun＞Liuyuan＞Shanhan＞Hami.     

消除叠后地震记录相干噪声的时-空变倾角KL变换

对常规KL变换和倾角扫描叠加KL变换用于去除地震剖面中相干噪声的情况进行了探讨,指出了它们的适用情况及局限性,并在此基础上提出了去除叠后地震记录中相干噪声的新方法———时空变倾角KL变换。使用该方法既能有效去除强相干噪声,又能较好保持有效信号同相轴的连续性。最后用合成剖面和实际剖面证明了该方法的有效性。     

The Significance of Traditional Culture for Agricultural Biodiversity—Experiences from GIAHS

Agricultural biodiversity has a high importance in social-cultural, economic, and environmental aspects, and can help in adapting to and withstanding climate change. Conserving the GIAHS sites and the important components within them can help conserve the agricultural biodiversity and traditional agricultural culture of the whole country. This study considered Ifugao Rice Terraces, Dong’s Rice-Fish-Duck System, and Hani Rice Terraces System as three examples which show that traditional culture can be used to protect agricultural biodiversity, while as a carrier of traditional culture, agricultural biodiversity also conveys and protects the traditional culture of the nation. According to the analyses, through several years of efforts, the status of agricultural biodiversity and traditional culture in them has improved. Then, to further promote agricultural biodiversity conservation and traditional culture protection, several suggestions are made, such as establishing community seed banks; documenting and preserving traditional farming methods, techniques, and tools and developing participatory activities which encourage more farmers to participate in the protection work.     

山东省海洋水产原、良种产业的发展和对策

为进一步提高山东省海洋水产种业的发展水平,促进海水养殖业和渔业经济的可持续发展,文章总结山东省海洋水产原、良种产业的发展特点,分析存在的问题,并提出对策建议。研究结果表明：山东省海洋水产原、良种产业具有起步较晚但发展速度较快,品种多、覆盖面广,代际连续性较强以及原、良种场建设全国领先的特点;目前仍然存在海洋水产良种的市场化程度较低、水产企业良种研发能力较弱以及国家级原、良种场的作用未有效发挥的问题;今后应重点推动育种技术进步,推进育、繁、推一体化发展模式,树立品牌意识,建立良种独立技术体系,加大对水产企业的支持力度,加强种质资源保护以及建立市场准入制度。     

Analysis and prediction of influence imposed on Jiaozhou Bay tidal currents and tidal energy of M2 tidal system by Jiaozhou Bay reclamation

The 3-D ECOMSED ocean model was applied to establish a time-dependent boundary model for Jiaozhou Bay (JZB), in which the operator-splitting technique was used and the ‘dry and wet’ method was introduced. The influence caused by JZB reclamation on the surface level, residual currents, tidal system and tidal energy of M₂ tidal system were predicted and analyzed. The results show that JZB reclamation has slight impact on the M₂ tidal system, in which the variation of amplitude and phase is less than 1%.The changes of the currents and residual currents in Qian Bay and near the reclamation areas are greater, but in other areas the changes are smaller, in which the currents have a change of around 1%, while the residual currents change ranges from 1.82%–9.61%. After reclamation, the tidal energy fluxes increase by 2.62%–5.24% inside and outside the JZB mouth, but decrease by 20.21%–87.23% near Qian Bay and the reclamation area.     

Synedra ulna var. repanda, a new variety of Synedra （Bacillariophyta） from Xinjiang, China

Synedra ulna var. repanda Q. X. Wang & Q. M. You, a new variety of Synedra (Bacillariophyta) from Xinjiang, China, is described and illustrated, and the characteristic of the variety: includes undulate-linear valves and straight pseudoraphe, differs from other species of Synedra.