Comprehensive measurement for carrying capacity of resources and environment of city clusters in central China

Studying the carrying capacity of resources and environment of city clusters in the central China has impor-tant practical guidance significance for promoting the healthy,sustainable and stable development of this region.Ac-cording to their influencing factors and reciprocity mechanism,using system dynamics approaches,this paper built a SD model for measuring the carrying capacity of resources and environment of the city clusters in the central China,and through setting different development models,the comprehensive measurement analysis on the carrying capacity was carried out.The results show that the model of promoting socio-economic development under the protection of resources and environment is the optimal model for promoting the harmony development of resources,environment,society and economy in the city clusters.According to this model,the optimum population scale of the city clusters in2020 is 42.80×106 persons,and the moderate economic development scale is 22.055× 1012 yuan(RMB).In 1996-2020,the carrying capacity of resources and environment in the city clusters took on obvious phase-change characteristics.During the studied period,it is basically at the initial development stage,and will come through the development process from slow development to speedup development.     

量子理论中一个定理的随机推广

随机情况下的量子理论有着更广泛的实际应用,所以利用数学期望将量子理论中的一个重要定理在随栅隋况下作了推广,证得这个定理对随机自相似集也成立,这对进一步研究随机自相似集的量子维数和量子误差提供了理论依据,丰富了量子理论．     

叠合盆地油气成藏体系研究思路与方法——以准噶尔盆地中部地区油气藏为例

以准噶尔盆地中部地区油气藏为例,阐述了叠合盆地油气成藏体系研究的基本思路和方法,归纳为“一个中心,两 条途径”。一个中心是指以油气藏为中心进行剖析研究,两条途径是指采用有机和无机地球化学相结合的研究方法。在准噶 尔盆地中部地区的实例研究结果表明,根据原油的有机（生物标志物）地球化学分析,研究区至少存在2大油气成藏体系, 即盆1井西凹陷东环带地区二叠系成藏体系、莫索湾中东部地区二叠系和侏罗系成藏体系。再通过无机地球化学（储层成 岩方解石）分析,发现研究区还存在另外2个成藏体系,即东道海子凹陷周边地区二叠系和侏罗系成藏体系、石东地区二 叠系成藏体系。在此基础上,进一步评价了各成藏体系中的油气潜力,以为区域油气勘探提供参考。因此,油气成藏体系 的研究有助于加强对勘探的指导;有机和无机地球化学相结合的研究方法相互补充,是对过去通常主要根据有机地球化学 方法进行分析的拓展与补充完善,形成了新认识,值得在今后的油气成藏体系研究中加强深入探索。     

基于迭代法的同轴法X射线相衬成像的相位复原

相位复原问题是指在只有强度可以测量的情况下,从强度数据中提取出物体的相位信息。相位复原是同轴法X射线相衬成像的关键问题之一。本文采用误差递减法,通过限制物体的空间大小,结合测量到的强度数据,在物体的空域和频域都进行约束。通过反复迭代,进行带宽外推,最终实现物面和像面的相位复原。仿真实验证明了此迭代算法的收敛性,并且以塑料管为样品,在上海光源采集到同轴法X射线相衬成像的实验数据,对上述算法进行了验证。     

Formation and deformation processes of late Paleogene sedimentary basins in southern central Hokkaido,Japan: Paleomagnetic and numerical modeling approach

Formation and deformation processes of the late Paleogene sedimentary basins related to a strike–slip fault system in southern central Hokkaido are described by a combination of paleomagnetic study and numerical analysis. After correction of the Miocene counter‐clockwise rotation associated with back‐arc opening of the Japan Sea, paleomagnetic declination data obtained from surface outcrops in the Umaoi and Yubari areas show significant easterly deflections. Although complicated differential rotation is anticipated as a result of recent thrust movements, clockwise rotation in the study areas is closely linked with development of the Paleogene Minami‐naganuma Basin as a pull‐apart depression along the north–south fault system. Numerical modeling suggests that 30 km of strike–slip is required to restore the distribution and volume of the Minami‐naganuma Basin. The relative slip rate on the long‐standing fault system is about 10 mm/yr, which corresponds to global‐scale plate motion. It has inevitably caused regional rearrangement of the eastern Eurasian margin. A rotation field simulated by simplified dextral motion using dislocation modeling basically accords with the paleomagnetic data around the pull‐apart basin.     

Non-linear buffeting response analysis of long-span suspension bridges with central buckle

The rigid central buckle employed in the Runyang Suspension Bridge (RSB) was the first time it was used in a suspension bridge in China. By using a spectral representation method and FFT technique combined with measured data,a 3D fluctuating wind field considering the tower wind effect is simulated. A novel FE model for buffeting analysis is then presented,in which a specific user-defined Matrix27 element in ANSYS is employed to simulate the aeroelastic forces and its stiffness or damping matrices are parameterized by wind velocity and vibration frequency. A nonlinear time history analysis is carried out to study the influence of the rigid central buckle on the wind-induced buffeting response of a long-span suspension bridge. The results can be used as a reference for wind resistance design of long-span suspension bridges with a rigid central buckle in the future.     

兰州地区剪切波速实测误差分析与评价

为了给兰州乃至西北地区的地震安全性评价和重大工程抗震设计提供参考,在兰州地区选取4个不同类别场地,完成由10家单位参加、使用不同仪器剪切波速现场测试误差专项实验,研究该地区剪切波速实测误差分布规律,讨论测试误差对地表加速度反应谱影响的统计特征,并给出该地区剪切波速测试误差评价。结果表明:兰州地区各单位剪切波速测试误差具有明显规律性,测试误差绝大部分符合标准正态分布,且误差大小不随深度和场地类别而改变;兰州地区波速测试水平优于全国平均水平,Ⅰ类、Ⅱ类和Ⅲ类场地的剪切波速测试精度较高,偏差较小,其平均标准差可以定为10%;就兰州地区而言,其1倍波速测试标准差引起PGA最大偏差为25%,2倍标准差为50%;给定波速测试误差下反应谱变化程度与输入波形相关,输入波频率成分与场地频率成分接近的地震输入下,误差影响较大,反之则影响较小。     

测氡仪K值变化对水氡测值的影响及校正

目前对测氡仪闪烁室K值变化引起水氡测值变化的校正方法存在明显的不合理性。利用曲线拟合方法拟合12个闪烁室K值变化的曲线方程,结果显示K值按二次曲线模型变化。采用该方法对甘肃武山22号井水氡进行重新校正,与之前的校正结果相比,重新校正的曲线连贯性和稳定性更好,且更趋于合理。分别分析武山22号井水氡新校正曲线、原始测值曲线和去台阶处理曲线与地震的对应关系,结果显示新校正的水氡曲线不仅在大地震前异常具有重现性特征,且在同一地震前与震中一定范围内其他台站的水氡异常具有同步性特性。这进一步表明,根据K值的变化机理对水氡测值进行重新校正是非常必要的。     

内蒙古中部红格尔地区白音高老组流纹岩地球化学特征及成因

内蒙古中部红格尔地区白音高老组主要由流纹岩组成, 含少量英安岩和粗安岩。流纹岩具有高硅、铝和钾,低钙镁的特点;富集大离子亲石元素K、Rb、Th和U, 高场强元素Nb、Ta、Ti和P强烈亏损, 具负异常;高w(Sr)/w(Y)和w(La)/w(Yb), 低w(Y)和w(Yb)。稀土元素总量较低, 轻重稀土元素分馏强烈, 具有中等的铕负异常。εNd(t)值为正值(+088~+266), tDM变化于5883~7164 Ma之间。主量、微量元素地球化学和Sr Nd Pb同位素组成显示红格尔地区白音高老组流纹岩为高钾钙碱性C型埃达克质岩, 其形成与蒙古—鄂霍茨克洋的闭合碰撞有关, 形成于早白垩世造山后加厚岩石圈跨塌阶段的板内伸展环境, 是加厚下地壳部分熔融的产物。岩浆源区部分熔融残留相为石榴子石, 在岩浆上升演化过程中经历了斜长石、钛铁矿和磷灰石的分离结晶作用。     

四川盆地中南部地区洗象池群沉积旋回的碳氧同位素特征及地质意义

摘要：四川盆地中南部地区寒武系洗象池群碳酸盐岩的碳、氧同位素组成受后期成岩作用影响较小,基本保留了原始海洋的同位素组成,根据该地区采集的88个碳、氧同位素数据,研究、讨论了中上寒武统碳酸盐岩不同尺度沉积旋回中的碳氧同位素组成、演化及地质意义。研究表明,四川盆地寒武系洗象池群由下至上的地层序列中,碳、氧同位素具有明显的旋回性演化特征：其δ13C值变化于－56‰～3247‰之间,均值为-0979‰,绝大多数的样品都在-2‰～2‰的区间震荡,δ18O值分布于-111‰～-52‰之间,均值为-6934‰,主要集中在－9‰～-6‰的范围内波动。通过对不同尺度沉积旋回碳、氧同位素数据分析研究,认为在体系域尺度沉积旋回中控制碳氧同位素组成特征的主因是海平面变化,在米级旋回中主要受高频海平面变化、古气候、古构造等多方面叠加的影响;通过对碳、氧同位素数据分析研究,首次明确了该地区芙蓉统的底界,为地层的划分对比提供了有力证据;洗象池群早期和中期经历了短暂而快速的海侵后进入缓慢的海退,在晚期缓慢海侵后的快速海退,碳同位素组成反映的海平面变化趋势与沉积相演化一致。