深圳东门61号大院基坑支护设计与施工

深圳东门61号大院项目临近地铁和浅基础房屋,基坑开挖深度17.15 m和18.60 m.基坑支护设计根据不同周边环境和地质情况采取咬合桩、冲孔桩、旋喷桩、内支撑及锚索等多种支护形式,运用三维数值分析方法对基坑施工进行模拟计算,分析了基坑开挖过程变形情况及其对地铁的影响,确保了基坑的安全施工,为同类基坑开挖提供了一个很好的工程实例.     

青海共和盆地中低温地热流体发电

青海省是我国地热资源相对丰富的地区, 但其主要地热能开发利用方式长期以来为效率较低的直接利用.以青海东北部地热异常明显的共和盆地为典型研究区, 依据前期地热地质调查和地球物理工作成果, 在盆地北部施工了终孔深度为1 852 m的DR2井, 获取了温度达84.2 ℃的地热流体.在此基础上, 建立了青海省首个试验地热发电站, 设计年平均净发电量为114 kW.与利用高温地热流体发电的西藏羊八井地热电站不同, 青海共和试验地热电站是青藏高原利用中低温地热流体发电的典范, 有望为青海省能源结构优化做出开拓性贡献.总体来看, 共和盆地地热流体温度较高、水量丰富、具有较大的发电潜力, 但在开发利用过程中也应注意结垢问题.      

Detail focused fusion of hyperspectral and multispectral imagesEI北大核心CSCD

Hyperspectral image (HSI) and multispectral image (MSI) are two types of images widely used in the field of remote sensing. These images are useful in certain applications, such as environmental monitoring, target detection, and mineral exploration. HSI contains a large amount of spectral information. Photons are typically collected in a larger spatial area on the sensor to ensure a sufficiently high signal-to-noise ratio (SNR). Accordingly, the HSI spatial resolution is much lower compared with MSI. This low spatial resolution greatly affects the practicality of HSI. Accordingly, fusing a low-spatial resolution HSI (LR-HSI) with a high-spatial resolution MSI (HR-MSI) in the same scene to obtain a high-resolution HSI (HR-HSI) is a method for solving such problems, which resolves the contradiction that the spatial resolution and the spectral resolution cannot simultaneously maintain a high level. From the analysis of fusion effect, the spatial and spectral reconstruction errors of the existing algorithms are mainly reflected in the edge and detail areas. The method proposed in this work was a fusion algorithm for dictionary construction and image reconstruction based on detail attention. In terms of maintaining spectral characteristics, the spectral distribution in the detail area is complex and diverse because of the proximity effect of the image. This work proposes to perform dictionary learning on the image and detail layers. The detail perception error terms and a constraint of edge adaptive directional total variation are proposed for spatial characteristic enhancement, which is combined with a local low rank constraint in the same fusion framework to estimate the sparse coefficient. Experiments were conducted on two datasets, namely, Pavia University and Indian Pine, to verify the effectiveness of the proposed method. The quantitative evaluation metrics contain peak SNR, relative dimensionless global error in synthesis, spectral angle map, and universal image quality index. Based on the experimental comparison, the fusion result of the algorithm proposed in this work is significantly improved compared with those of the other algorithms in terms of spatial and spectral characteristics. This work uses dictionary learning to propose a fusion algorithm for dictionary construction and image reconstruction with attention to details through the analysis of the existing hyperspectral and multispectral image fusion algorithms. A hierarchical dictionary learning algorithm is proposed to address the problem of large reconstruction error in the detail part of the existing algorithms. The detail perception error term and the direction adaptive full variational regularization term are used to improve the spectral dictionary solution and coefficient estimation, respectively. The result of the fusion is the error in the spectral characteristics and spatial texture of the detail, which achieves an accurate representation of the edge detail. © 2022 National Remote Sensing Bulletin. All rights reserved.     

Comparison of nominal and standardized catch per unit effort data in quantifying habitat suitability of skipjack tuna in the equatorial Pacific Ocean

In the western and central Pacific Ocean, upper strata waters exhibit highly dynamic oceanographic features under ENSO variability. This has been proved to be responsible for the dynamic change of both abundance and zonal distribution of skipjack tuna(Katsuwonus pelamis). Although causality has been suggested by researchers using physical–biological interaction models, cumulative evidence needs to be obtained and the tenability of assertion needs to be tested from an ecological habitat perspecti...     

环印度洋地区中国国家风险的综合评估及时空演变分析

环印度洋地区对中国经济发展与国家安全至关重要,但是环印度洋地区广阔的地域空间和复杂的社会环境,对中国企业投资、商贸往来等构成诸多潜在风险。基于2005—2019年环印度洋地区49个国家的相关数据,从政治、经济、社会和文化4个维度选取22个指标构建环印度洋地区国家风险评价指标体系,利用动态时间规整和地图可视化探究环印度洋地区5个子区域2005—2019年综合风险及各维度风险的时空演变特点。研究结果表明：① 2005—2019年,环印度洋地区国家的综合风险总体呈下降趋势,但区域内国家仍集中在中风险和较高风险等级;② 巴基斯坦?阿富汗?伊拉克?伊朗和埃及?苏丹?厄立特里亚?索马里是区域内2大综合风险高值集聚区,环印度洋地区国家的综合风险呈现较为明显的“区域集聚性”特点;③ 不同地区主导风险不同,政治风险是除澳大利亚以外其他地区的主导风险,也是环印度洋地区目前最主要的风险来源。     

大气科学类核心期刊综合评价指标的比较研究

归纳统计了10种大气科学类核心期刊2004-2011年共计8 a的资料,对期刊的总被引频次、影响因子、他引率、基金论文比、平均引文数这5个指标作了简单比较.结果表明:各期刊的总被引频次和平均引文数呈现逐年上升的趋势;影响因子呈波动变化,其中《气象》和《气象科技》的影响因子2011年是2004年的近4倍;他引率在8 a中变化不大,平均值大致在0.5～0.7之间,但各个期刊的他引率数值差别很大;基金论文比相差不大,大部分期刊都在0.9左右.通过几种指标的分析与比较,反映出了目前我国大气科学类核心期刊的发展现状.     

Submesoscale motions and their seasonality in the northern Bay of Bengal

The unbalanced submesoscale motions and their seasonality in the northern Bay of Bengal(BoB) are investigated using outputs of the high resolution regional oceanic modeling system. Submesoscale motions in the forms of filaments and eddies are present in the upper mixed layer during the whole annual cycle. Submesoscale motions show an obvious seasonality, in which they are active during the winter and spring but weak during the summer and fall. Their seasonality is associated with the mixed layer...     

U–Pb and Re–Os Ages of the Huaheitan Molybdenum Deposit,NW China

The Huaheitan molybdenum deposit in the Beishan area of northwest China consists of quartz‐sulfide veins. Orebodies occur in the contact zone of the Huaniushan granite. LA‐ICPMS U–Pb zircon dating constrains the crystallization of the granite at 225.6 ± 2.2 Ma (2σ, MSWD = 4.5). Re–Os dating of five molybdenite samples yield model ages ranging from 223.2 ± 3.5 Ma to 228.6 ± 3.4 Ma, with an average of 225.2 ± 2.4 Ma. The U–Pb and Re–Os ages are identical within the error, suggesting that the granite and related Huaheitan molybdenum deposit formed in the Late Triassic. Our new data, combined with published geochronological results from the other molybdenum deposits in this region, imply that intensive magmatism and Mo mineralization occurred during 240 Ma to 220 Ma throughout the Beishan area.     

内蒙古二连盆地阿北凹陷下白垩统近岸水下扇沉积特征*

阿北凹陷位于内蒙古二连盆地东北部,面积约600 km²,是二连盆地勘探潜力最大的凹陷之一。针对阿北凹陷复杂的地质构造,充分利用岩心、录井、测井以及地震等资料,详细分析了阿北凹陷北部陡坡带下白垩统近岸水下扇沉积特征和分布规律。研究表明,近岸水下扇和扇三角洲在岩相组合、沉积构造、粒度特征、电性特征和地震反射特征方面均有较大区别,综合反映以重力流为主的沉积环境。阿尔善期北部陡坡带发育大规模水下扇,扇体规模自下而上逐渐向北部物源方向减小,到腾格尔期沉积了一大套深湖—半深湖暗色泥岩,近岸水下扇砂砾岩体下切到深湖—半深湖暗色泥岩中,决定了研究区近岸水下扇砂体具有优越的成藏条件。     

华北板块北缘古大洋闭合时间的限定 ——来自四子王旗西后壕子同碰撞花岗岩的证据

位于华北板块北缘四子王旗北部的西后壕子花岗岩体的Cameca IMS-1280-SIMS锆石U-Pb年龄为266Ma±2Ma。该岩体主要由二长花岗岩组成,以出现大量颗粒较大的白云母为特征,具有较高的SiO2含量（75.21%~76.69%）,A/CNK值多大于1.1,CIPW标准矿物中刚玉的含量也都高于1%。在球粒陨石标准化稀土元素配分图解上,Eu具有强烈的负异常（δEu=0.03~0.11）,REE呈现出明显的M型四分组效应,部分微量元素也表现出non-CHARAC的性质。在原始地幔标准化微量元素配分图上,元素Ba、Nb、Sr和Ti相对亏损,Cs、Rb、Th和Pb相对富集。在构造环境判别图解中,所有样品均落入同碰撞花岗岩区域。结合区域地质背景及以上特征,西后壕子岩体应为强过铝质的高分异S型花岗岩,形成于二叠纪晚期的陆-陆碰撞环境中。270~260Ma期间,四子王旗地区发育EW向的碰撞花岗岩带,限定华北板块与南蒙古微大陆沿索伦缝合带的闭合时间为二叠纪晚期。