Protective and treatment measures against major harmful organisms in cotton-growing belt of Xinjiang     

Received date: -- Foundation item: Supported by Light of Western Regions Project  Key Project of CAS Integrated Demonstration Project for Sustainable Development of Cotton in Xinjiang with High Quality High Yield Technique LU Zhaozhi  CHEN 《地理学报(英文版)》2000,(3)

1 Harmful Organisms in Xinjiang Cotton-Growing BeltThe harmful organisms in Xinjiang cotton-growing belt are mainly diseases, insects and weeds. The diseases include Verticillium albo-atrum, cotton-root decaying disease and cotton-boll decaying disease, while the harmful insects include cotton aphids (Aphis gosspii), cotton mites, cotton boll-worms (Heliothis armigera), cotton thrips (Thrips. sp), Lygus pratersis and cutworms. Their harmful effects vary in different places but all of them …  相似文献   

Imaging the recent sediment dynamics of the Galicia Bank region (Atlantic,NW Iberian Peninsula)     

Gemma Ercilla  David Casas  Juan T. Vázquez  Jorge Iglesias  Luís Somoza  Carmen Juan  Teresa Medialdea  Ricardo León  Ferran Estrada  Soledad García-Gil  Marcel.lí Farran  Fernando Bohoyo  Margarita García  Adolfo Maestro  ERGAP Project  Cruise Teams 《Marine Geophysical Researches》2011,32(1-2):99

Multibeam bathymetry, high resolution multi-channel, and very high resolution single-channel (3.5 kHz) seismic records were used to depict the complex geomorphology that defines the Galicia Bank region (Atlantic, NW Iberian Peninsula). This region (≈620–5,000 m water depth) is characterized by a great variety of features: structural features (scarps, highs, valleys, fold bulges), fluid dynamics-related features (structural undulations and collapse craters), mass-movement features (gullies, channels, mass-flow deposits, slope-lobe complexes, and mass-transport deposits), bottom-current features (moats, furrows, abraded surface, sediment waves, and drifts), (hemi)pelagic features, mixed features (abraded surfaces associated to mixed sediments) and bioconstructions. These features represent architectural elements of four sedimentary systems: slope apron, contouritic, current-controlled (hemi)pelagic, and (hemi)pelagic. These systems are a reflection of different sedimentary processes: downslope (mass transport, mass flows, turbidity flows), alongslope (bottom currents of Mediterranean Outflow Water, Labrador Sea Water, North Atlantic Deep Water, and Lower Deep Water), vertical settling, and the interplay between them. The architectural and sediment dynamic complexities, for their part, are conditioned by the morphostructural complexity of the region, whose structures (exposed scarps and highs) favor multiple submarine sediment sources, affect the type and evolution of the mass-movement processes, and interact with different water masses. This region and similar sedimentary environments far from the continental sediment sources, as seamounts, are ideal zones for carrying out submarine source-to-sink studies, and can represent areas subject to hazards, both geologic and oceanographic in origin.  相似文献   

Sustainable mineral resources management: from regional mineral resources exploration to spatial contamination risk assessment of mining   总被引：3，自引：0，他引：3  

Gyozo?JordanEmail author  JRC PECOMINES Project 《Environmental Geology》2009,58(1):153-169

Wide-spread environmental contamination associated with historic mining in Europe has triggered social responses to improve related environmental legislation, the environmental assessment and management methods for the mining industry. Mining has some unique features such as natural background contamination associated with mineral deposits, industrial activities and contamination in the three-dimensional subsurface space, problem of long-term remediation after mine closure, problem of secondary contaminated areas around mine sites, land use conflicts and abandoned mines. These problems require special tools to address the complexity of the environmental problems of mining-related contamination. The objective of this paper is to show how regional mineral resources mapping has developed into the spatial contamination risk assessment of mining and how geological knowledge can be transferred to environmental assessment of mines. The paper provides a state-of-the-art review of the spatial mine inventory, hazard, impact and risk assessment and ranking methods developed by national and international efforts in Europe. It is concluded that geological knowledge on mineral resources exploration is essential and should be used for the environmental contamination assessment of mines. Also, sufficient methodological experience, knowledge and documented results are available, but harmonisation of these methods is still required for the efficient spatial environmental assessment of mine contamination.  相似文献   

Report of the Science Community Workshop on the proposed First Sample Depot for the Mars Sample Return Campaign     

Prepared by the MSR Campaign Science Group  A. D. Czaja  M.-P. Zorzano  the rest of the MCSG team  with Chairs  G. Kminek  M. A. Meyer  Members  D. W. Beaty  E. Sefton-Nash  B. L. Carrier  F. Thiessen  T. Haltigin  A. Bouvier  N. Dauphas  K. L. French  L. J. Hallis  R. L. Harris  E. Hauber  L. E. Rodriguez  S. P. Schwenzer  A. Steele  K. T. Tait  M. T. Thorpe  T. Usui  J. Vanhomwegen  M. A. Velbel  S. Edwin  K. A. Farley  D. P. Glavin  A. D. Harrington  L. E. Hays  A. Hutzler  M. Wadhwa 《Meteoritics & planetary science》2023,58(6):885-896

The Mars 2020/Mars Sample Return (MSR) Sample Depot Science Community Workshop was held on September 28 and 30, 2022, to assess the Scientifically-Return Worthy (SRW) value of the full collection of samples acquired by the rover Perseverance at Jezero Crater, and of a proposed subset of samples to be left as a First Depot at a location within Jezero Crater called Three Forks. The primary outcome of the workshop was that the community is in consensus on the following statement: The proposed set of ten sample tubes that includes seven rock samples, one regolith sample, one atmospheric sample, and one witness tube constitutes a SRW collection that: (1) represents the diversity of the explored region around the landing site, (2) covers partially or fully, in a balanced way, all of the International MSR Objectives and Samples Team scientific objectives that are applicable to Jezero Crater, and (3) the analyses of samples in this First Depot on Earth would be of fundamental importance, providing a substantial improvement in our understanding of Mars. At the conclusion of the meeting, there was overall community support for forming the First Depot as described at the workshop and placing it at the Three Forks site. The community also recognized that the diversity of the Rover Cache (the sample collection that remains on the rover after placing the First Depot) will significantly improve with the samples that are planned to be obtained in the future by the Perseverance rover and that the Rover Cache is the primary target for MSR to return to Earth.  相似文献   

Elastic properties of seafloor sediments from the modelling of amplitudes of multiple water waves recorded on the seafloor off Bear Island,North Atlantic   总被引：1，自引：0，他引：1  

Marek Grad  Rolf Mjelde  Wojciech Czuba  Aleksander Guterch  the IPY Project Group 《Geophysical Prospecting》2012,60(5):855-869

Wide‐angle seismic data acquired by use of air‐guns and ocean bottom seismometers (OBS) contain strong direct water arrivals and multiples, generally considered as noise and thus not included in the modelling. However, a recent study showed that standard ray‐tracing modelling of the water multiples recorded off the Bear Island, North Atlantic, provided a reliable estimate of the velocity distribution in the water layer. Here, we demonstrate that including the amplitudes in the modelling provide valuable information about the V_P contrast at the seafloor, as well as the V_P/V_S ratio and attenuation (Q_P) of the uppermost sediments. The V_P contrast at the seafloor is estimated at about 250 m/s, within a precision of approximately ±30 m/s. The V_P/V_S ratio in the uppermost sedimentary layer is modelled in the range 2.25–2.50 and the Q_P factor is estimated at 1000 for the water, 30–50 for the uppermost layer and 40–50 for the second sedimentary layer. The values obtained for the sediments suggest a lithology dominated by silty clays, with porosity below average.  相似文献   

康山“古油藏”讨论之三——康山“沥青脉”的成因   总被引：1，自引：0，他引：1  

徐克定 《海相油气地质》1997,(3)

通过对康山固体可燃脉体产状、脉石矿物性质、构造发展史的综合分析,认为其成因很可能是下寒武统荷塘组中的软沥青和有机质,在加里东运动期间,由于区域应力体系的变化而爆炸运移形成的。康山脉石矿物是沥青和有机质,不是煤和无机物。沥青的源岩为下寒武统荷塘组富有机质的黑色泥岩、硅质泥岩、硅质岩。康山脉中的固体沥青和有机质,当初挤入时应呈塑性流动状态,康山沥青系由石油经热演化而成。  相似文献   

Full scale wake and boundary layer instrumentation feasibility study     

Vernon A. Phelps  Research Scientist  Project Director  Armin W. Troesch  Assistant Research Scientist  John P. Hackett  Graduate Research Assistant 《Ocean Engineering》1980,7(2):281-304

Fluid-flow measuring devices intended for full scale use were designed and tested. One device consisted of a rake supporting different types of pitot tubes. This will be used to obtain a velocity profile of the boundary layer of a test ship. The other device was a five-hole pitot tube that was used in a wake survey. The pressure transport medium (i.e. the medium that carried the pressure signal from the pitot tube to the pressure transducer) was air instead of water. This proved to be successful, as the results indicate.  相似文献   

The Planck cluster survey     

J.G. Bartlett  A. Chamballu  J.‐B. Melin  M. Arnaud  Members of the Planck Working 《Astronomische Nachrichten》2008,329(2):147-150

The Planck Satellite will survey the entire sky in 9 millimeter/submillimeter bands and detect thousands of galaxy clusters via their thermal Sunyaev‐Zel'dovich (SZ) effect. The unprecedented volume of the survey will permit the construction of a unique catalog of massive clusters out to redshifts of order unity. We describe the expected contents of this catalog and use an empirical model of the intra‐cluster gas to predict the X‐ray properties of Planck SZ clusters. Using this information we show how a ∼10 Ms follow‐up program on XMM‐Newton could increase by ∼100‐fold the number of clusters with measured temperatures in the redshift range z = 0.5–1. Such a large sample of well‐studied massive clusters at these redshifts would be a powerful cosmological tool and a significant legacy for XMM‐Newton. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)  相似文献   

中国反射地震"陆相断陷模型"简介   总被引：8，自引：1，他引：7  

"油储地球物理"项目办公室 《地球物理学报》2000,43(5):725-728

为了提高反射地震数据处理方法研究水平 ,验证各种速度建模及偏移成像算法的实用效果 ,ＩＦＰ(ＩｎｓｔｉｔｕｔＦｒａｎｃｏｉｓｄｅＰｅｔｒｏｌｅ)、ＳＥＧ/ＥＡＧＥ等地球物理组织 ,在 90年代先后推出了二维Ｍａｒｍｏｕｓｉ模型和三维盐丘模型 ,业已成为勘探地球物理界的标准模型 .显然 ,这两个模型是基于欧美及中东国家的地质背景 ,反映海相沉积特点的 .为促进陆相油储地球物理学的发展 ,满足我国油田对方法技术发展的需求 ,使检验地震处理方法的地质模型能够体现我国陆相沉积的具体特点 ,经国家自然科学基金会重大项目“陆相油储地球…  相似文献   

中国地震局<大陆强震机理与预测>项目学术交流代表团赴美考察     

项目赴美学术交流代表团 《国际地震动态》2000,(11):15-17

２０００年５月,以《大陆强震机理与预测》项目首席科学家张国民研究员为团长的中国地震局《在陆强震机理与预测》项目学术交流代表团一行８人赴美进行学术交流和访问。代表团在美国期间,先后参观访问了门洛帕克美国地质调查局、加州大学洛杉矶分校、加州理工学院、华盛顿卡内基研究所、美国国家科学基金会和麻省理工学院等单位,并与美方有关专家学者和项目管理人员就有关学术问题科研项目的评审和管理等问题进行了交流和讨论。  相似文献