Quaternary

Xem 1-20 trên 39 kết quả Quaternary
  •   There  are  five  Quaternary  sedimentary  sequences  in  the  Red  River  Delta,  Vietnam.  The  forming of each sequence is related to transgression and regression phases. The sequences, which  was  formed  in  transgression  period,  composed  mainly  of  fine  grained  size  leading  to  the  water  bearing capacity is very low and plays a role as aquicludes. Besides, in these fine grain size layers,  the contents of arsenic and iron are high, especially in dark clay, silty clay rich in organic material ...

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  •  Vietnam has over 3200 km shoreline which extends from north to south of the country.  Sea level changes were principal factors influenced on sedimentary environment and compositions.  In Quaternary, cycles of sea level change and tectonic movement were main factor that created Red  River  delta,  Nam  Bo  plain  and  Central  plain.  There  are  5  sedimentary  cycles  corresponding  to  5  cycles  of  sea  level  change  of  the  Red  River  delta  and  Nam  Bo  plain.  Sedimentary  cycles  were ...

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  • From the tubers of Stephania rotunda Lour. growing in Vietnam, seven quaternary protoberberine alkaloids, dehydrocorydalmine, jatrorrhizine, columbamine, palmatrubine, stepharanine, palmatine and fissisaine were isolated. These structures were characterized on the basis of MS and NMR spectroscopic data and comparison of those spectral data with reported data.

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  • Research objectives: To elucidate of characteristics of lithological composition, physicalmechanical properties and distribution of Quaternary sediments, the relationships between sediment characteristics, especially, the soft soil layers in the West Hanoi to land subsidence and ground collapse; then to propose prevention measures for sustainable development of infrastructure.

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  • Eastern Sea of Vietnam is the world's largest semi-open sea and is bounded by archipelagos, islands, mainland and connected partially with Pacific and Indian Ocean. Its total water surface area is about 2,974,600km2. Vietnamese and foreign geoscientists have researched, got samples and mapped the geological map of Eastern Sea since 1960s but no guidance or right method was carried out to map, especially in presenting geological units on geological map.

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: A Quaternary ZnCdSeTe Nanotip Photodetector

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  • Tuyển tập các báo cáo nghiên cứu khoa học ngành toán học tạp chí Department of Mathematic dành cho các bạn yêu thích môn toán học đề tài: Classification of Generalized Hadamard Matrices H(6, 3) and Quaternary Hermitian Self-Dual Codes of Length 18...

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  • A wide range of approaches has been applied to examine the quaternary structure of G protein-coupled receptors, the basis of such protein–protein interactions and how such interactions might modulate the pharmacology and function of these receptors. These include coimmunoprecipitation, var-ious adaptations of resonance energy transfer techniques, functional com-plementation studies and the analysis of ligand-binding data.

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  • Bloodcoagulation is triggeredby the formationof acomplex between factor VIIa (FVIIa) and its cofactor, tissue factor (TF). TF–FVIIa is inhibited by tissue factor pathway inhibitor (TFPI) in two steps: first TFPI is bound to the active site of factor Xa (FXa), and subsequently FXa–TFPI exerts feedback inhibition of TF–FVIIa. The FXa-depend-ent inhibition of TF–FVIIa activity by TFPI leads to for-mation of the quaternary complex TF–FVIIa–FXa–TFPI.

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  • Hiện nay, trong chăn nuôi các nhóm thuốc sát trùng gồm Chlorine, lodophors, Peroxide, Phenol, Quaternary ammonia, Aldehydes... được sử dụng phổ biến. 1. Nhóm Chlorine, lodophors: Gồm các thuốc sát trùng có chứa chlorine và iodine, iodophor. - Chlorine: có phổ rộng, diệt được vi khuẩn, virus, nấm, bào tử và tảo. Chloramin T và Chloramin B là 2 loại thuốc sát trùng thuộc nhóm này, thường được pha loãng với nồng độ 2- 5% để phun xịt chuồng trại.

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  • Volume 41 of the Handbook on the Physics and Chemistry of Rare Earths adds four chapters to the series: two focus on nanoscale rare-earth mate- rials, while the other two are concerned with divergent topics—the arrangement of the rare-earth elements in the periodic table, and the higher order rare-earth chalogenide compounds with the elements of the 14th group and also In. The first chapter (248) discusses the various proposals suggested for the location of the rare-earth elements in the periodic table from the time of Mendeleev to the present day.

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  • ADAPTIVE COMMUNICATIONS AND THE BOOK LAYOUT In order to justify the content of the book and to make suggestions on how the book should be studied, we start with the generic block diagram of a digital communication system shown in Figure 1.1. The standard building blocks, information source, source encoder, encryptor, channel encoder and data modulator are used to produce a narrowband signal, for example, binary phase shift keying (BPSK), quaternary phase shift keying (QPSK) or M-ary quadrature amplitude modulation MQAM carrying information content.

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  • Starting from a derivation of the conservation equations for multicomponent multiphase flows in porous media and a discussion of convective vs. diffusive/dispersive transport, the reader is introduced to a mathematical framework, based on the method of characteristics, for solving convection-dominated transport problems.

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  • 5 Biological Activity of Waters Containing Cationic Surfactants Cationic surfactants along with anionic and nonionogenic surfactants are one of the main classes of surfactants. The proportion of cationic surfactants in the total volume of synthetic surfactants used in the economy is approximately equal to 22% (for the U.S.; Ainsworth 1992). Cationic surfactants enter aquatic ecosystems together with polluted waters because they are widely used in many industries including petroleum industry, oil refining industry, petrochemical industry, and gas industry.

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  • Raja et al. International Journal of Emergency Medicine 2011, 4:19 http://www.intjem.com/content/4/1/19 ORIGINAL RESEARCH Open Access Abdominal imaging utilization in the emergency department: trends over two decades Ali S Raja1,2,4*, Koenraad J Mortele1,3,4, Richard Hanson1,3, Aaron D Sodickson1,3,4, Richard Zane1,2,4 and Ramin Khorasani1,3,4 Abstract Background: To assess patterns of use of abdominal imaging in the emergency department (ED) from 1990 to 2009.

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  • The sequence stratigraphy units of the Quaternary sediments at the continental shelf of Vietnam have been compared with the lithofacies and depositional cycles in relation to sea level changes. During the regression phases corresponding to the lowstand systems tract has being formed the alluvial lithofacies, shelf deltaic complex and shelf edge fans complex. The maximum regression remarked by erosion boundaries has corresponded with the lowstand sea level characterized by the slope fan turbiditte complex.

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  • Phase-transfer-catalyzed alkylation of glycinate Schiff base with racemic secondary alkyl halides proceeded with excellent levels of synand enantioselectivities under the influence of a chiral quaternary ammonium bromide and 18- crown-6. The alkylation product can be selectively converted to the corresponding anti isomer, allowing the preparation of all the stereoisomers of β-alkyl-α-amino acid derivatives.

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  • Tham khảo sách 'updates in volcanology – a comprehensive approach to volcanological problems_2', tài liệu phổ thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • Volcanism witnesses every major change of our planet and other planets. In Advances in Volcanology, scientists from highly active volcanic countries, such as Japan, Italy, and New Zealand, as well as others from Germany, Portugal, and Russia, debate less commonplace themes. Topics from classic field volcanology, including practical problems with volcanic stratigraphy in oil exploitation, to the most modern techniques related to tomographic studies are discussed.

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  • Abstract X-ray crystal structure determination of agglutinin from abrus precatorius in Taiwan is presented. The crystal structure of agglutinin, a type II ribosome-inactivating protein (RIP) from the seeds of Abrus precatorius in Taiwan, has been determined from a novel crystalline form by the molecular replacement method using the coordinates of abrin-a as the template. The structure has space group P41212 with Z = 8, and been refined at 2.6 Å to R-factor of 20.4%. The rootmean-square deviations of bond lengths and angles from the standard values are 0.009 Å and 1.3°.

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