Characteristics of seismic reflections in central region of the South China Sea and their geological significance

More than 4 000 km 48-channel seismic reflection data from the central region of the South China Sea have been interpreted. Five seismic interfaces have been distinguished, named T1, T2, T4, T6 and Tg respectively Meanwhile, five seismic sequences numbered I - V have been divided with the ages of Quaternary and Pliocene, Later Mocene, Earlier and Middle Miocene, Oligocene and Pre- Oligocene separately. Sequences I-II overlie all parts of the area. In the continental slope and island slope, Sequences III-V are mainly found in the grabens. Sequence III is found at moot profiles of the deep-sea basin, and Sequnce IV is seen not only at the margins of the east subbasin but also at the margins of the southwest subbasin. Strong reflection from Moho is found at most profiles of the deep-sea basin. The depth of Moho varies between 10 and 12 km, with a thickness of 6- 8 km for the crust. Calculated by age-basement depth correlation formula, the age of basaltic basement in the southwest subbasin is 51-39 Ma. It is indicated that the evolution of the southwest subbasin is simultaneous with or earlier than that of the east subbasin.

Comparative Assessment of the Proximate and Mineral Composition of <i>Cucumis sativus</i>L. and <i>Solanum aethiopicum</i>L. Fruit Samples Grown in South Eastern and North Central Regions of Nigeria Respectively

Studies were carried out to comparatively assess the proximate and mineral composition of Solanum aethiopicum L. and Cucumis sativus L. fruit samples grown in the South Eastern and North Central regions of Nigeria respectively, following standard analytical procedures and instrumentation. The mineral elements (Na, K, Zn and Ca) were determined using atomic absorption spectrophotometer after wet digestion of the samples while the proximate parameters (ash content, moisture content, crude fibre content, crude protein content, crude fat content and carbohydrate content) were determined in accordance with standard analytical procedures. The mean range of the moisture, crude fibre, crude protein, crude fat, ash and carbohydrate contents in the S. aethiopicum L. fruit samples grown in the North Central and South Eastern regions of Nigeria were 72.49 - 88.23, 2.15 - 3.67, 1.31 - 1.85, 0.43 - 0.76, 0.51 - 0.84 and 3.18% - 5.72% respectively. Additionally, the moisture, crude fibre, crude protein, crude fat, ash and carbohydrate contents in the Cucumis sativus L. fruit samples grown in the South Eastern and North Central regions of Nigeria, had mean range of values of 93.60 - 98.76, 0.53 - 0.77, 2.14 - 2.84, 0.29 - 0.46, 0.90 - 1.14 and 3.88% - 4.66% respectively. The range of mean values of Na, K, Zn and Ca in the S. aethiopicum L. fruit samples from the South Eastern and North Central regions of Nigeria were 0.36 - 0.57, 1.92 - 2.80, 0.84 - 1.01 and 0.43 - 0.61 μg/g respectively. Also, Na, K, Zn and Ca had mean range of values of 1.36 - 4.08, 10.16 - 13.09, 0.45 - 0.66 and 5.85 - 9.3 μg/g respectively in the C. sativus L. fruit samples grown in the South Eastern and North Central regions in Nigeria. The levels of the determined proximate of parameters and mineral elements in the studied fruit samples from the investigated regions of Nigeria were statistically significant. This therefore indicates that the geographical locations where these fruit samples grew could have significantly impacted on their nutrient content levels. The levels of the determined proximate parameters from the selected regions of Nigeria shows that consumption of the fruit samples (S aethiopicum L. and C. sativus L.) especially regularly, would help supply the essential nutrients and minerals required for a healthy living.

Comparative Assessment of the Phytochemical and Selected Heavy Metal Levels in <i>Cucumis sativus</i>L. and <i>Solanum aethiopicum</i>L. Fruit Sample Grown in South Eastern and North Central Regions of Nigeria Respectively

Studies were carried out to comparatively assess the phytochemical and heavy metal levels in Solanum aethiopicum L. and Cucumis sativus L. fruit samples grown in the South Eastern and North Central regions of Nigeria respectively using standard analytical procedures and instrumentation. The fruit samples were assayed for selected heavy metals (Pb, Cd and Cu) using atomic absorption spectrophotometer after wet digestion of the samples. The five detected phytochemicals (flavonoids, alkaloids, terpenoids, saponins and glycosides) were present at varying amounts in the investigated fruit samples from the South Eastern and North Central regions of Nigeria. The range of mean values of flavonoids, terpenoids, saponins and glycosides in the S. aethiopicum L. fruit samples from the two studied regions were 0.50 - 0.57, 0.53 - 1.26, 0.44 - 0.78, 1.12 - 1.93 and 0.40 - 0.50 mg/g respectively. The range of mean values of flavonoids, alkaloids, terpenoids, saponins and glycosides in the C. sativus L. fruit samples from the two studied regions of Nigeria were 1.27 - 1.69, 0.53 - 0.55, 0.96 - 1.51, 0.41 - 0.83 and 0.90 - 1.74 mg/g respectively. The range of mean vales of Pb, Cd, and Cu in the S. aethiopicum L. fruit samples from the two studied regions were 0.15 - 0.24, 0 - 0.01, 0.78 - 1.12 μg/g respectively. 0.31 - 0.40, 0.02 - 0.05 and 0.62 - 0.96 μg/g were the range of mean values of Pb, Cd and Cu respectively in the C. sativus L. fruit samples from the two studied regions of Nigeria. Of the three investigated heavy metals, only Cd was at toxic levels in the C. sativus L. fruit samples from the South Eastern and North Central regions of Nigeria. This is therefore a health concern to the fruit consumers that includes these fruits in their habitual daily fruit diets. Although the therapeutic and pharmaceutical benefits that would be derived from consuming, the investigated fruit samples has been shown in this study, there is therefore a possible risk of undue exposure to environmental pollutants such as heavy metal, especially through growing these fruits in polluted soils resulting from unwholesome anthropogenic practices. For fruit consumers to derive maximum health benefits from consuming these fruits, pollutants like heavy metals must be at non-toxic levels and this can only be achieved by ensuring that these fruits samples are grown and harvested in environments with less anthropogenic activities.

赣中南地区传统村落的时空演化及影响因素研究

赣中南地区是江西省乃至全国传统村落资源相对丰富的地区之一,但随着城镇化推进,传统村落也遭受不同程度的破坏以及文化失传的威胁,因此,开展赣中南地区传统村落集中保护及文化传承工作具有重要意义。以赣中南地区274个传统村落为研究对象,对赣中南地区传统村落的“时间-空间”维度进行了演变过程研究,并分析了其影响因素。研究结果表明:1)赣中南地区传统村落呈“整体凝聚,区域差异”态势。主要集中在东北部金溪县、中部乐安县和吉水县,总体呈现以多点为核心的“小范围聚集”“大范围散乱”的空间分布格局;2)赣中南地区的传统村落主要形成于宋代以后,随着朝代的更替,传统村落数量不断增加并向东北部的金溪县和中部的吉水县聚集,形成“西南-东北”聚集的空间分布方向特征;3)赣中南地区传统村落的时空分布是自然、人文、历史文化等诸多因素共同作用的结果。

Tectonic Framework of Late Paleozoic Intrusions in Xingxingxia： Implications for Final Closure of South Tianshan Ocean in East Tianshan

This work carried out systematic geological field investigation, petrography observation, zircon geochronology and whole rock geochemistry on Late Paleozoic intrusions in the Xingxingxia region near the Xinjiang-Gansu provincial boundary, western China, aiming to constrain the Late Paleozoic tectonic framework of the Xingxingxia region and the final closure time of South Tianshan Ocean in the East Tianshan. The Xingxingxia area is located in the east part of the Tianshan orogen, and adjacent to the north of the Tarim Basin. The Late Paleozoic magma activities in the Xingxingxia region can be mainly divided into three stages. The first stage includes intrusive magma activities under a collision setting between Late Ordovician to the Late Devonian. The second stage is intrusive magma activities under a subduction setting during（304±3）–（278±3） Ma, and the third stage involves intrusive magma activities under a collision and post-collision setting during（268±5）–（259.9±2.6） Ma. The final suture zone of South Tianshan Ocean should be between the Central Tianshan Block and South Tianshan accretionary complex. Based on previous work, both the first stage magma activities（i.e., intrusive magmatic activities between the Late Ordovician to Late Devonian） and the Hongliuhe ophiolitic complex indicate a close event between Central Tianshan Block and South Tianshan Accretionary Complex. The 304±3 Ma dioritic metamorphic gneiss of the XingX ingxia complex and the 278±3 Ma diorite are all island arc calc-alkaline rocks, the 289±3 Ma gabbro is island arc tholeiitic gabbro formed by magma from metasomatic enrichment mantle. All these results indicate that the second stage of magmatic activities is under a subduction setting. The third stage magma activities i.e. the granitic magma activities of（268±5）–（259.9±2.6） Ma occurred at a transitional setting from compressional to post-collision extensional tectonic setting. Thus, around（268±5）–（260±3） Ma, the final closure of the South Tianshan Ocean occurred and the Tianshan orogen shifted into the intracontinental evolution stage. During and after the closure process, a wide range of metamorphism and large dextral strike-slip faults developed.

20世纪50年代初中南地区土改中的乡村妇女

20世纪50年代,中国共产党在中南地区实行了以土地改革为中心的乡村社会改造运动。在中国共产党的领导和动员下,中南乡村妇女从封建制度的束缚和家庭的藩篱中解放出来,以满腔的热情积极投身于土地改革的洪流中。妇女作为一个在历史上失语的群体,能如此鲜活地活跃在乡村政治舞台上,这与中国共产党的正确引导密切相关。中国共产党建立的新政权及其领导的土地改革为乡村妇女提供了前所未有的提高社会地位的良机,妇女日益起到了“半边天”的作用,成为土改运动中不可缺少的力量。

冀中南地区“石家庄—邢台”城市链发展构想

冀中南地区需要尽快形成“石家庄市—邢台市”城市链,通过石家庄市与京津大都市建立联系,在有效促进石家庄“第三极”城市团的同时,也加大了石家庄市与冀中南地区的联系.“石家庄市—邢台市”城市链依托县级中心地建立起来,乡镇中心地在城市链上发挥着底层支撑作用.“高邑县+柏乡县”整合在一起的高柏连接带成为“栾任链”上的承接点,进一步提升了“石家庄市—邢台市”城市链的发展质量,在此过程中要通过构建“元氏县—赵县—高邑县”三角形和“内丘县—隆尧县—柏乡县”三角形分别提升与栾城区、任泽区的黏合度,通过“两端挤压”推进“栾任链”中间地区凸起,让凸起更好地扮演承接角色.

新疆在中国与中南亚区域经济合作中的战略地位与作用

自古以来,新疆在中国的经济社会发展战略中处于特别重要的位置。无论是从地缘政治角度考虑,还是从地缘经济角度考虑,新疆与中南亚区域经济整合趋势是不可避免的。环新疆经济圈概念的提出,在一定程度上,更加明确了中国新疆参与中南亚区域经济合作的必然性和可行性。可以预见,21世纪的新疆将成为沟通中国与中亚、南亚、西亚乃至欧洲的中介纽带,成为中国西部地区经济循环与协作的"催化剂"和"推进器",成为欧亚大陆的又一国际经贸中心,从而为"大中华经济圈"在世界东方的崛起做出历史性的贡献。本文在环新疆经济圈概念背景下,深入分析了新疆在中国与中南亚区域经济合作中的战略地位和作用。

中南地区矿山环境地质现状与恢复治理分区

通过对中南地区矿产开发情况的综合,阐明了该地区矿山开发中遇到的主要环境地质问题,并依据该地区矿山开发所引起的环境地质问题的严重程度,对地域进行了分级,提出了防治措施和对策建议。

黔中-渝南沉积型铝土矿区域成矿模式及找矿模型

黔中—渝南沉积型铝土矿的区域成矿模式概括如下:志留纪末的广西运动和泥盆纪末的紫云运动等,可能都是在峨眉地幔柱演化的壳幔相互作用阶段,因地幔柱向地壳大量输送物质和辐射能量,从而引发的地壳升降运动,在此期间,全区大面积抬升,形成长期隆起区;泥盆纪末准平原化;早石炭世岩关期气候湿热,暴露地表的早古生代岩石全面红土化、钙红土化,形成的含三水铝石红土风化壳物质,为沉积型铝土矿提供了物源。修文及息烽—遵义沉积区,于早石炭世大塘期早—中期沉积了铝土矿含矿岩系—九架炉组。绥阳—正安—道真沉积区,在晚石炭世的黄龙组石灰岩沉积并钙红土化之后,于马平期沉积了铝土矿含矿岩系的大竹园组。3个沉积区的铝土矿含矿岩系,都是在以陆相为主的环境中沉积形成的。在成岩阶段,铝土矿中的三水铝石逐渐变质为硬水铝石。由于各沉积区形成含三水铝石红土风化壳的母岩不同,由此沉积而成的铝土矿及其含矿岩系,在化学成分和矿物成分上也就有所差异。

湘中南丘岗地区土壤发生特性及系统分类

选取湖南省中南部丘岗地区11个土壤剖面,研究其土壤成土环境和形成特点。结果表明,该区土壤质地以黏土为主,土壤黏粒淋溶明显,黏化过程较强,各剖面表现出铁游离度高、活化度低的特点,处于中度富铁化过程。根据《中国土壤系统分类检索(第三版)》,鉴定了诊断层和诊断特性,确定了供试土壤剖面在中国土壤系统分类中的归属,其中原发生分类中的红壤(04、22、23号剖面)属普通强育湿润富铁土;红壤(07、13号剖面)属网纹简育湿润富铁土;菜园土(19号剖面)属斑纹肥熟旱耕人为土;紫色土(20号剖面)属酸性紫色正常新成土;粗骨土(21号剖面)属普通湿润正常新成土;石灰土(01号剖面)属普通钙质湿润雏形土;紫色土(16、17号剖面)属斑纹紫色湿润雏形土。

山西中南部重载铁路桥梁设计活载标准研究

研究目的：铁路列车活载标准是铁路桥梁设计的核心参数，其活载图式的拟定需综合考虑移动装备现状与发展、运输模式、运营速度及加载方式等因素。本文以山西中南部铁路通道为工程背景，针对国内既有的轴重30t重载货车，共拟定6种不同运营活载图式，根据该重载铁路桥梁的设计活载中-活载（2005）（Z=1．2），计算设计活载相对6种不同的运营荷载的发展储备系数，明确该重载铁路桥梁设计活载标准的发展储备水平，即对于小跨度和大跨度桥梁，设计活载发展储备系数较小，中等跨度桥梁设计活载发展储备系数较大。研究结论：（1）通过对设计活载发展储备系数计算分析，山西中南部铁路通道桥梁设计活载采用中-活载（2005）（Z=1．2）能够满足开行既有30t轴重货车的要求；（2）该活载标准对于1～12m桥涵，设计活载的发展储备系数偏低，设计活载储备系数在1．0—1．2之间；对于加载长度12—200m桥涵，设计活载的发展储备系数均在1．2以上；（3）中-活载（2005）的荷载图式中特种荷载值偏低致使小跨度桥涵荷载储备偏低，因此该活载图式特种荷载值需要提高；（4）该研究成果可直接用于后续的重载铁路桥梁设计。

中南带杉木林乔木层碳储量生长与成熟模拟

以中南带杉木林乔木层为研究对象,用人工神经网络表达碳储量与林龄之间的非线性关系,构建了BP人工神经网络模型.以乔木层各组分的碳储量年龄序列对所建模型进行训练和分析,得适宜的模型结构为1∶1∶4,总体拟合准确度为97.46%.以年均碳储量最大值对应的年龄定义碳储量成熟龄,基于所建模型,应用MATLAB编程语言编制了计算碳储量生长与成熟的计算机模拟程序,模拟的生长曲线符合森林生长规律,计算的碳储量成熟龄符合研究对象实际,表明所编计算机模拟程序有效.

坚持科学发展观,以科技创新促进区域统筹协调发展——对中南地区科技工作的思考和建议

本文分析了坚持科学发展观对于促进经济社会全面、协调和可持续发展的重要意义,以及科学技术在实现科学发展观中的重要地位和关键作用,并在此基础上,结合我国中南地区实现区域统筹协调发展的需要,提出全面推进区域创新体系建设的若干政策建议。

征粮、“春荒”与减租退租:对土地改革的再认识——以1949-1951年中南区为中心

1949年,在新解放地区,中共进行了紧张的支前借粮和公粮秋征运动,外加人民币贬值的损失和公债任务,造成农民负担沉重,从而导致1950年春中南各省普遍发生了饥荒。各地许多已经消失的"匪乱"重新活跃了起来,进行抗粮抢粮的请愿和暴动,一度造成政府和民众关系紧张。为此,中南局通过发动群众对"地主"进行"减租退租"斗争,成功把"农民—政府"之间的冲突引向了"农民—地主"的"阶级"矛盾。中共政权有意坚持在新解放区实行农民继续交租,后依法减租的政策,刻意推迟"土改"时间,以便有充分理由对地主阶级征收高额的阶级累进税,增加国家财政收入。这表明,中共的"土改"并不意在简单地改变乡村土地制度,而是要把它当作新政权进行意识形态宣传的依附体,以及各项行动合法性的理论源泉。

川中—川南地区须家河组有利储集砂体地震识别及其分布预测

分流河道和河口坝砂体是川中—川南地区上三叠统须家河组主要的有利储集砂体。依据露头、岩心、钻井、测井资料设计单一河口坝、河道和叠置河道砂体的地质模型,开展模型正演,得出地震响应模型,并以此指导各种有利砂体在地震资料中的识别,预测了须家河组有利储集砂体的平面展布。河口坝砂体呈底平顶凸的地震反射特征,河道砂体呈顶平底凸的上超充填反射特征,多期叠置河道呈透镜状—波状、具有中强振幅、中低频率的特征,并验证了模型正演所获得的反射特征与地震相和测井相是吻合的。该区河道、河口坝有利储集砂体广泛分布,主要发育在除合1井—合川5井以南、河包场和合川13井以北、通4—岳5井以外的广大地区。

中南地区林权争议处理调查研究

分析了中南地区林权争议的特点与原因,总结了处理争议的主要做法和经验,认为中南地区能充分认识林权争议处理工作的重要性、艰巨性、长期性和复杂性。着力加强相关制度、队伍、机制建设,及时化解了大量林权争议,工作成效显著。指出了当前的突出困难和问题,法制建设滞后,调处队伍薄弱,任务繁重,难度大,场群矛盾突显。基于此,提出了相应的对策建议。

谈谈中南半岛中西部区域文化

中南半岛的中西部包括缅甸、泰国、老挝、柬埔寨等国,湄公河流经该地区。自古以来,该区域受中国与印度文化的影响,不仅曾经形成了举世闻名的吴哥文化,更有上座部佛教和泼水节等具有区域特征的文化。加强中国与该区域的文化交流,既可促进我国与中南半岛国家之间的大湄公河次区域合作,也会有助于和谐区域的构建。

南水北调工程与中部地区产业的经济联系

南水北调工程是一项跨流域、长距离的调水工程,工程投资对区域经济增长具有重要作用。文章阐述了南水北调中线工程与中部地区产业的经济联系,具体分析了调水工程建设期工程投资本身对当地产业的直接带动作用,以及调水工程在运营调水期由于水资源条件和水供求关系的改善对中部地区产业与部门发展的影响。