Radiometric Zircon Ages of a Tuff Sample from the Baishantou Member of Wuyun Formation,Jiayin:A Contribution to the Search for the K-T Boundary in Heilongjian River Area,China

The existence of the Cretaceous-Tertiary （K/T） boundary in the non-marine succession is expected at Jiayin in the Heilongjiang River area, China. Zircons from a tuff sample from the Baishantou Member of Wuyun Formation in Jiayin were analyzed by the laser ablation inductively coupled plasma mass spectrometry （LA-ICP-MS） U-Pb dating and fission-track dating methods. Ages of 64.1±0.7 Ma （U-Pb） and 61.7±1.8 Ma （fission-track dating） were obtained, which allow reevaluation of a previously reported late Maastrichian age for the tuff layer that was in conflict with the paleontological evidence. These results confirm the Danian age of the section in agreement with the paleontological evidence.

Permian/Triassic Boundary and Its Correlation in the Daxian-Xuanhan Area, Northeastern Sichuan Province, China

There are different opinions about the Permian/Triassic boundary and its correlation in the Daxian-Xuanhan area because of lacking typical lithological symbols and fossil criterions. Especially, it is very hard to determine the Permian/Triassic boundary in the Daxian-Xuanhan buried areas. This brings many difficulties to geological research and oil and gas exploration. Based on field investigation and studies of well cores, newly found fossils, lithological characteristics and well log analyses, the authors discussed the Permian/Triassic boundary in the Daxian-Xuanhan area and brought forward a specific scheme for its determination and regional correlation.

Carbon Isotope Excursions and Paleo-Oceanography of the Ordovician–Silurian Boundary Carbonate Rocks from the Xainza Area, Tibet

Objective The Ordovician–Silurian transitional period is a special time when the global paleo-environment changed greatly.It witnessed the first mass extinction as of Phanerozoic period and glaciations that occurred frequently at a large scale in a very short time,which has thus attracted much attention among geoscientists at home and abroad.

Use of the area of main influence to fix a relevant boundary for mining damages in Germany

In 2010, the fracking discussion in Germany caused a number of changes in German law, which came into force in 2016.Especially the production of gas had to be regulated.With the legislation amendment, the Subsidence-Area Mining Regulation has been revised, too.The changes expand the compensation of mining damages, especially to the extraction with drilling from the surface and underground storage.Although the Subsidence-Area Mining Regulation has been revised, the area of main influence(subsidence of 10 cm)remains to determine a relevant boundary for mining damages.The determination and prediction of this boundary above caverns are presented in this paper.In addition, further elements of ground movements and their relevance to mine damages are analyzed.The usage of the area of main influence to fix a relevant boundary for mining damages does not correspond to the relevant elements of ground movements.A limit for differences in subsidence(tilt) or horizontal changes in length should be preferred to describe the relevance of mining damages on buildings.Furthermore, this paper outlines the meaning of using the area of main influence to fix a relevant boundary for mining damages.

Annual variation in Calanus sinicus abundance and population structure in the northern boundary area of the Yellow Sea Cold Water Mass

The Yellow Sea Cold Water Mass(YSCWM) was suggested as an over-summering site of the dominant copepod species Calanus sinicus in coastal Chinese seas.Population abundance and structure were investigated by monthly sampling along three transects across the northern boundary of the YSCWM during 2009–2010.Results show that thermal stratification existed from June to October and that the vertical thermal difference increased with depth.Generally,total abundance was lowest in October and highest in June,and the female/male sex ratio was highest in February and lowest in August.Evident spatial differences in abundance were observed during the existence of the YSCWM.In June,total abundance averaged 158.8 ind/m3at well-stratified stations,and 532.1 ind/m3at other stations.Similarly,high abundances of 322.0 and 324.4 ind/m3were recorded from July to August inside the YSCWM,while the abundance decreased from 50.4 to 1.9 ind/m3outside the water mass.C.sinicus distribution tended to even out over the study area in September when the YSCWM disappeared.We believe that the YSCWM may retard population recruitment in spring and preserve abundant cohorts in summer.The summer population was transported to neritic waters in autumn.In addition to low temperatures,stable vertical structure was also an essential condition for preservation of the summer population.C.sinicus can survive the summer in marginal areas in high abundance,but the population structure is completely different in terms of C5 proportion and sex ratio.

The Calculation of Stress-Strain State of Anisotropic Composite Finite-Element Area with Different Boundary Conditions on the Surface

The numerical analytic research approach of stress-strain state of anisotropic composite finite element area with different boundary conditions on the surface, is represented below. The problem is solved by using a spatial model of the elasticity theory. Differential equation system in partial derivatives reduces to one-dimensional problem using spline collocation method in two coordinate directions. Boundary problem for the system of ordinary higher-order differential equation is solved by using the stable numerical technique of discrete orthogonalization.

Atmospheric Carbon Dioxide Reconstruction and Ocean Acidification Deduced from Carbon Isotope Variations across the Triassic–Jurassic Boundary in the Qiangtang Area, Tibetan Plateau

Objective The end-Triassic mass extinction was one of the five most profound Phanerozoic extinction events.This event was accompanied by a series of significant environmental changes,of which the most notable is the emergence of warm climate and the world-wide disappearance of carbonate platform.

An advanced segmentation using area and boundary tracing technique in extraction of lungs region

A new method is presented for the segmentation of pulmonary parenchyma. The proposed method is based on the area calculation of different objects in the image. The main purpose of the proposed algorithm is the segment of the lungs images from the computer tomography(CT) images. The original image is binarized using the bit-plane slicing technique and among the different images the best binarized image is chosen. After binarization, the labeling is done and the area of each label is calculated from which the next level of binarized image is obtained. Then, the boundary tracing algorithm is applied to get another level of binarized image. The proposed method is able to extract lung region from the original images. The experimental results show the significance of the proposed method.

灰飞虱自动识别计数方法研究

为更精确地施药,提供可靠的虫量数据,提出一种基于图像识别技术的灰飞虱数量计算方法。设定由拍摄距离和相机调节倍数组成三组拍摄条件,融合区域面积、区域圆度和边界直径三个参数组合构成识别计数模型,利用边缘检测和区域填充完成图像中的个体提取,每组条件下分别计算5张单个长翅和短翅的参数值作为标准。拍摄条件相同的情况下,分别计算4张相互独立和4张有轻微连接的灰飞虱的计数图像,将每个区域的结果比对参数标准值范围,如果三个参数均在范围内,则输出1;至少有一个参数不符合,重新计算该区域面积和边界直径,当同时符合标准值的2倍时,输出2。试验结果表明:灰飞虱全为独立的图像中,有8张相对错误率为0%,3张小于10%,1张为13.3%;轻微连接的图像中,有2张相对错误率为0%,6张小于10%,4张为10%~25%,能满足灰飞虱数量的自动计算。

世界地质公园规划编制中若干问题探讨——以光雾山-诺水河世界地质公园为例

地质公园规划是每个地质公园管理和后期建设的重要依据,也是地质公园能够可持续发展的重要保障。以光雾山-诺水河世界地质公园规划编制实例,从技术层面来探讨在世界地质公园规划编制中地质公园范围划定、地质遗迹保护区划定及保护级别确定、总体空间布局策划、功能区区划等问题,为世界地质公园规划编制及探索世界地质公园规划编制技术要求提供参考。

基于生态系统完整性的自然保护地边界划定方法--以欧美地区的实践为例

科学划定自然保护地的边界关系到保护目标的实现和管理措施的制定,是自然保护地规划和建设的首要环节。该文以欧美地区的实践案例为例,介绍了基于生态系统完整性的自然保护地边界划定方法。首先对现有自然保护地边界划定方法进行梳理,在此基础上介绍了面向实施的景观单元(Operational Landscape Units)的概念和划定流程;其次梳理了韦斯特布鲁克圩田保护边界划定和旧金山湾海岸带保护边界划定的案例;最后为我国自然保护地的边界划定提出建议。

协调发展视角下大南昌都市圈城市增长边界的划定

科学划定城市增长边界(UGB)能合理引导城市发展方向,有效抑制无序蔓延。基于协调发展视角,结合多目标土地利用适宜性评价方法与PLUS模型划定大南昌都市圈刚性UGB及自然增长、政策约束、协调发展3种情景下的弹性UGB。结果表明:①多目标土地利用适宜性呈现空间差异且存在重叠和交叉,协调发展最适宜区与农业生产最适宜区、生态保护最重要区重叠面积相比城镇建设最适宜区均有所下降;②刚性UGB面积占研究区总面积的76.11%,保障大南昌都市圈城市扩张严格遵循生态保护红线和粮食安全底线;③PLUS模型模拟结果总体呈耕地、林地、草地、未利用地减少以及水域和建设用地增加的趋势,其中建设用地扩张最显著,但协调发展情景下城市扩张得到有效约束,且该情景下弹性UGB能有效减缓城市扩张占用农业或生态价值最高区域,更能优化城市景观格局。研究结果有利于引导和实现大南昌都市圈城市可持续发展,也可为其他城市三生空间协调发展提供参考。

不同透水条件下海底饱和沉积层动力响应特性分析

海床沉积层的透水条件可以直接影响其在地震中的动力响应特性,但是在现有的理论研究中,大部分都直接假设海床沉积层的底部为不透水边界。为此,基于Biot饱和多孔介质理论,通过求解沉积层瞬态响应和稳态响应的解析解或半解析解,研究了沉积层底部透水条件对其在地震中动力响应特性的影响。研究结果表明,在底部位移激励的条件下,快波和慢波经过沉积层的不透水底部边界时会产生一类压缩波,经过沉积层完全透水底部边界时会产生两类压缩波;即使在相同的激励条件下,不同透水性能的沉积层中产生的两类压缩波的振动幅值也具有非常显著的差异;沉积层底部透水条件也会影响海床的频率响应特性,低频时底部透水的沉积层的位移放大系数较大;相反,高频时底部不透水的沉积层的位移放大系数较大。

一种基于多维度生态评估的自然保护地边界优化方法——以三江源国家公园黄河源园区为例

科学准确划定自然保护地边界是设立保护地及制定和实施保护管理措施的首要前提,厘清自然保护地边界是在整合优化自然保护地的过程中首要解决的问题。以生物多样性与生态系统服务双保护为目标,基于In VEST和SWAT模型综合评估生态系统服务,并基于生物完整性等级(Degree of Biological Integrity,DBI)和生态增强因子(Enhancement Factor,EF)评估了保护成本及生态效益,提出了一种自然保护地的边界优化方法。基于这种方法将三江源国家公园黄河源园区的现有边界优化为涵盖总体自然边界、核心生态边界与管理边界的多重边界,从而使生态系统服务得到最大限度的保护,使生物多样性保护得到一定程度的加强,并同时考虑管理效益,确保新增保护成本较低。

基于形态聚类的老旧小区临街边界优化研究——以安徽省合肥市老城区为例

老旧小区临街边界作为日常生活的重要场所是公共与私密的过渡区域,但随着小区的逐渐陈旧,当前浮现出较多亟待解决的问题。本文以安徽省合肥市老城区为例,量化研究老旧小区临街边界的空间形态,运用聚类分析的方法根据形态特征总结出小尺度渗透型、中小尺度凹凸型、中大尺度封闭型及大尺度平整型四类边界,并根据个性问题分别提出针对性的优化策略,以期为老旧小区临街边界形态划分提供全新依据,同时为样本边界更新提供一定的参考价值。

破围与限界:对中央苏区时期妇女角色的再考察

中央苏区时期,中国共产党把妇女运动与政治革命运动紧密结合,通过开展一系列社会革命让妇女取得了政治、经济、文化教育、婚姻自主等方面全面的解放,从而启发妇女的政治意识,使妇女成为支持苏维埃运动的中流砥柱群体。然而,妇女在整个革命中扮演的不仅只有革命支持者与被解放者这两重身份,受限于革命政权的生存压力,妇女自身的女性角色常常处于失语状态。革命中的妇女角色的“破围”与“限界”需要全新的考察。

生态系统保护和修复的初步探讨

通过对抚远市界江界河区域生态系统存在主要问题及其生态系统保护和修复价值分析,提出该区域生态系统保护和修复技术要求,研究制定保护和修复方案,为持续推进抚远市界江界河区域东北森林带中的林地、湿地与草原生态系统的保护修复等项工作提供参考。

白芨多糖对大鼠跨区皮瓣choke区的影响

目的探究白芨多糖对大鼠跨区皮瓣choke区的影响和机制。方法将32只SD大鼠随机分成两组:对照组,给予生理盐水;给药组,给予白芨多糖生理盐水溶液。手术结扎胸背动脉和肋间后动脉,保留髂腰动脉。术后7 d,统计皮瓣存活率,血管造影观察choke动脉生长情况,HE染色显微镜下观察choke区微血管密度和动脉内径,Western blot检测choke区皮瓣组织血管内皮生长因子(VEGF)蛋白表达水平。结果术后7 d,给药组皮瓣存活率高于对照组,(86.1±1.4)%vs(61.3±4.0)%,P<0.0001;给药组髂腰动脉直径更粗,(681.60±35.48)μm vs(446.98±21.61)μm,P<0.0001;血管向皮瓣远端延伸更长,(6.50±0.33)cm vs(5.41±0.38)cm,P<0.0001;给药组choke区微血管密度更高(11.8±1.5)个vs(6.7±1.3)个,P<0.0001;动脉内径更大,(60.14±6.99)μm vs(28.01±5.07)μm,P<0.0001;VEGF蛋白表达水平增加,P<0.0001。结论白芨多糖可促进皮瓣成活,机制与调节choke区血管新生、扩张和VEGF表达有关。

矿山越界开采预防措施初探

矿山越界开采的现象时有发生,一方面侵害了国家的矿产资源,另一方面也侵犯了周边合法矿业权人的权益,这种行为的发生不但扰乱了矿产资源开发秩序,还产生了重大安全隐患和资源纠纷。但是由于其行为发生的隐蔽性较强,在平时的实地检查核查中难以发现,这是当前政策管理的重点也是难点。同时,由于产生矿山越界开采的原因较多,包括但不限于政策方面、行政管理方面、技术层面,还有矿山企业的主观不作为等,因此,研究矿山越界开采的行业及其行为,以及由此产生的众多现象就显得尤为必要。本文从越界开采的基本内涵出发,重点分析了越界开采现有的预防措施,以及检查核查的技术成果,分析了越界开采形成的原因,并从政策制定层面、政府落实层面和技术支持层面提出相应的措施。通过对越界开采的研究,为我国政策制定以及技术发展应用提借新的思路和可借鉴的方法。

县(市)中心城区范围确定方法研究——以吉林省永吉县为例

中心城区是县(市)级总体规划的重要概念和规划层次,但长期以来存在概念内涵不明晰、划定方法无规范的问题。本文采用理论研究与项目实践相结合的方法,首先对中心城区的概念和相关研究进行辨析梳理,并结合国土空间规划体系构建需求重新提出中心城区的概念内涵。其次,借鉴城区范围确定技术规程和城镇开发边界划定要求,结合县级国土空间规划编管实践提出中心城区范围确定的技术流程。最后选取吉林省吉林市永吉县中心城区对方法进行验证及优化,保障方法的规范、合理、易操作,以期为后续的规划审批、体检评估和法规标准修订提供参考。