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Inbreeding and genetic load in a pair of sibling grouse species:Tetrastes sewersowi and ***

Avian Research 2024年第2期15卷 265-270页

作者： Kai Song Tom van der Valk Bin Gao Peter Halvarsson Yun Fang Wendong Xie Siegfried Klaus zhiming han.yue-hua sun Jacob Hoglund Key Laboratory of Animal Ecology and Conservation Biology Institute of ZoologyChinese Academy of SciencesBeijing100101China Animal Ecology Department of Ecology and GeneticsUppsala UniversityNorbyvagen 18DUppsala75236Sweden Department of Cell and Molecular Biology Uppsala75273Sweden Unit of Parasitology Department of Biomedicine and Veterinary Public HealthSwedish University of Agricultural SciencesPO Box 7036Uppsala75007Sweden Lindenhohe 5 JenaD-07749Germany The State Key Laboratory of Reproductive Biology Institute of ZoologyChinese Academy of SciencesBeijing100101China

Genetic load and inbreeding are recognized as important factors to be considered in conservation *** levels of both can increase the risk of population extinction by negatively impacting fitness-related characters in many species of plants and animals,including humans(inbreeding depression).Genomic tech-niques are increasingly used in measuring and understanding genetic load and inbreeding and their importance in evolution and *** used whole genome resequencing data from two sibling grouse species in subarctic Eurasia to quantify *** found a large range of inbreeding measured as FROH(fraction of runs of homozygosity)in individuals from different populations of Chinese Grouse(Tetrastes sewerzowi)and Hazel Grouse(***).FROH estimated from genome-wide runs of homozygosity(ROH)ranged from 0.02 to 0.24 among Chinese Grouse populations and from 0.01 to 0.44 in Hazel *** from a population of Chinese Grouse residing in the Qilian mountains and from the European populations of Hazel Grouse(including samples from Sweden,Germany and Northeast Poland)were the most inbred(FROH ranged from 0.10 to 0.23 and 0.11 to 0.44,respectively).These levels are comparable to other highly inbred populations of *** Grouse from northern China and Chinese Grouse residing in the Qinghai-Tibetan Plateau showed relatively lower inbreeding *** of the ratio between deleterious missense mutations and synonymous mutations revealed higher levels in Chinese Grouse as compared to Hazel *** results are possibly explained by higher fixation rates,mutational melt down,in the range-restricted Chinese Grouse compared to the wide-ranging Hazel ***,when we compared the relatively more severe class of loss-of-function muta-tions,Hazel Grouse had slightly higher levels than Chinese Grouse,a result which may indicate that purifying selection(purging)has been more efficient in Chinese Grouse on this class of mutations.

关键词： Genetic load Inbreeding Purifying selection Qinghai-Tibetan Plateau ROH Tetrastes

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基于梯度转移和自编码器的红外与可见光图像融合

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吉林大学学报（工学版） 2024年第6期54卷 1777-1787页

作者：李延风刘名扬胡嘉明孙华栋孟婕妤王奥颖张涵玥杨华民韩开旭长春理工大学计算机科学技术学院长春130022 长春理工大学人工智能学院长春130022 北部湾大学电子与信息工程学院广西钦州535011

针对红外与可见光图像融合过程中图像特征提取不充分、易丢失中间层信息和训练时间长的问题,本文提出一种基于梯度转移结合自编码器的端到端轻量级图像融合网络结构。该网络结构由编码器、融合层和解码器三部分组成。首先,将Bottleneck... 详细信息

针对红外与可见光图像融合过程中图像特征提取不充分、易丢失中间层信息和训练时间长的问题,本文提出一种基于梯度转移结合自编码器的端到端轻量级图像融合网络结构。该网络结构由编码器、融合层和解码器三部分组成。首先,将Bottleneck块引入编码器当中,利用卷积层和Bottleneck块对输入的红外图像和可见光图像进行特征提取得到深度特征图,将梯度提取算子引入融合层,对获得的深度特征图进行处理获得对应的梯度图。其次,将每张深度特征图和对应的梯度图在融合层通过融合层策略对应融合,重新设计损失函数,将融合后的特征图和梯度图进行拼接并输入解码器进行解码重建出融合图像。最后,选取目前的代表性融合方法进行对比验证,在SF、MI、VIF、Qabf、SCD、AG、EN和SD 8个融合质量评估指标上,前七个指标性能提升显著,分别提高57.4%、54.6%、28.3%、74.2%、23.8%、43.1%、1.3%,第八个指标性能接近。并进行网络模型参数分析和时间复杂度对比实验,本文算法模型参数为12352,算法用时为1.1246 s。实验结果表明:本文方法可以快速生成目标清晰、轮廓明显、纹理突出、符合人类视觉感受的融合图像。

关键词：计算机应用机器视觉红外图像可见光图像图像融合梯度转移自编码器

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Study of the response of 10B-doped MCP to wide-energy range neutrons from eV to MeV

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Nuclear Science and Techniques 2024年第8期35卷 132-141页

作者： Qiang Li Li‑Jiao Wang Xiang‑Biao Qiu Jing‑Wen Li Wei Xu Tao Li Ze‑Bin Lin Chang‑Jun Ning Yong‑Hao Chen Rui‑Rui Fan Kang sun Jing‑Yu Tang Rong Zhang han‑Tao Jing Bo Mei Qi An Hao‑Fan Bai Jiang‑Bo Bai Jie Bao Ping Cao Qi‑Ping Chen Zhen Chen Zeng‑Qi Cui An‑Chuan Fan Chang‑Qing Feng Fan‑Zhen Feng Ke‑Qing Gao Min‑Hao Gu Chang‑Cai han Zi‑Jie han Guo‑Zhu He Yong‑Cheng He Yang Hong Yi‑Wei Hu han‑Xiong huang Wei‑hua Jia Hao‑Yu Jiang Wei Jiang Zhi‑Jie Jiang Zheng‑Yao Jin Ling Kang Bo Li Chao Li Gong Li Jia‑Wen Li Xiao Li Yang Li Jie Liu Rong Liu Shu‑Bin Liu Guang‑Yuan Luan Bin‑Bin Qi Jie Ren Zhi‑Zhou Ren Xi‑Chao Ruan Zhao‑Hui Song Zhi‑Xin Tan Sheng‑Da Tang Peng‑Cheng Wang Zhao‑Hui Wang Zhong‑Wei Wen Xiao‑Guang Wu Xuan Wu Li‑Kun Xie Yi‑Wei Yang han Yi Yong‑Ji Yu Guo‑Hui Zhang Lin‑Hao Zhang Mo‑han Zhang Qi‑Wei Zhang Xian‑Peng Zhang Yu‑Liang Zhang yue Zhang Zhi‑Yong Zhang Mao‑Yuan Zhao Lu‑Ping Zhou Zhi‑Hao Zhou Ke‑Jun Zhu Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Spallation Neutron Source Science Center Dongguan 523803China State Key Laboratory of Particle Detection and Electronics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Dongguan Songshan Lake Future School Dongguan 523808China North Night Vision Science&Technology(Nanjing)Research Institute Co.Ltd. Nanjing 211106China Sino‑French Institute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230027China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621900China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China USTC Archaeometry Lab University of Science and Technology of ChinaHefei 230026China Northwest Institute of Nuclear Technology Xi’an 710024China University of Chinese Academy of Sciences Beijing 100049China

Neutron-sensitive microchannel plates(nMCPs)have applications in neutron detection,including energy spectrum measurements,neutron-induced cross sections,and neutron imaging.10B-doped MCPs(B-MCPs)have attracted significant attention owing to their potential for exhibiting a high neutron detection efficiency over a large neutron energy *** spatial and temporal resolutions are useful for neutron energy-resolved ***,their practical applications still face many technical *** this study,a B-MCP with 10 mol%10B was tested for its response to wide-energy neutrons from eV to MeV at the Back-n white neutron source at the China Spallation Neutron *** neutron detection efficiency was calibrated at 1 eV,which is approximately 300 times that of an ordinary MCP and indicates the success of 10 B *** factors that caused the reduction in the detection efficiency were simulated and *** neutron energy spectrum obtained using B-MCP was compared with that obtained by other measurement methods,and showed very good consistency for neutron energies below tens of *** response is more complicated at higher neutron energy,at which point the elastic and nonelastic reactions of all nuclides of B-MCP gradually become *** is beneficial for the detection of neutrons,as it compensates for the detection efficiency of B-MCP for high-energy neutrons.

关键词： Neutron radiation image 10B-doped MCP Neutron response Wide-energy range neutrons

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玉米雄性不育突变体ms1153的遗传分析与基因定位

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玉米科学 2024年第2期32卷 16-22页

作者：郭瑶晴孙晓靖连玉杰陈慧曹旭东陆涵孙华越汤继华陈晓阳河南农业大学农学院郑州450046 周口市农业科学院河南周口466000

以玉米雄性不育突变体ms1153为材料,通过减数分裂期花粉母细胞染色体观察和不同发育时期花药石蜡切片分析突变体不育表型产生的原因,利用F1和F2群体确定突变体ms1153的遗传方式和基因MS1153物理位置。结果表明,与野生型相比,突变体植株... 详细信息

以玉米雄性不育突变体ms1153为材料,通过减数分裂期花粉母细胞染色体观察和不同发育时期花药石蜡切片分析突变体不育表型产生的原因,利用F1和F2群体确定突变体ms1153的遗传方式和基因MS1153物理位置。结果表明,与野生型相比,突变体植株在营养生长期无明显差异,在生殖生长阶段花药不能从颖壳外露,成熟花粉粒内无淀粉积累。细胞学分析发现,突变体减数分裂过程正常,但减数分裂后绒毡层降解推迟。遗传分析表明,突变体ms1153的不育性状受1对隐性核基因控制。利用图位克隆的策略将MS1153基因定位于玉米第4染色体分子标记8243与8275之间,物理区间为221.4~226.2 Mb,此区间内没有已克隆雄性育性基因,说明MS1153是一个新的玉米雄性育性基因。

关键词：玉米雄性不育 ms1153 基因定位绒毡层

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Nondestructive technique for identifying nuclides using neutron resonance transmission analysis at CSNS Back-n

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Nuclear Science and Techniques 2024年第1期35卷 178-187页

作者： Sheng-Da Tang Yong-Hao Chen Jing-Yu Tang Rui-Rui Fan Qiang Li Gong Li Dong Liu Zheng-Yao Jin Xing-Zhu Cui Tian-Xiang Chen Yi-Wei Yang Rong Liu han Yi Yang Li Zhen Yang Qi An Hao-Fan Bai Jiang-Bo Bai Jie Bao Ping Cao Qi-Ping Chen Zhen Chen Zeng-Qi Cui An-Chuan Fan Chang-Qing Feng Fan-Zhen Feng Ke-Qing Gao Min-Hao Gu Chang-Cai han Zi-Jie han Guo-Zhu He Yong-Cheng He Yang Hong Yi-Wei Hu han-Xiong huang Wei-hua Jia Hao-yu Jiang Wei Jiang Zhi-jie Jiang Ling Kang Bo Li Chao Li Jia-Wen Li Xiao Li Jie Liu Shu-Bin Liu Guang-Yuan Luan Chang-Jun Ning Bin-Bin Qi Jie Ren Zhi-Zhou Ren Xi-Chao Ruan Zhao-Hui Song Kang sun Zhi-Xin Tan Li-Jiao Wang Peng-Cheng Wang Zhao-Hui Wang Zhong-Wei Wen Xiao-Guang Wu Xuan Wu Li-Kun Xie Yong-Ji Yu Guo-Hui Zhang Lin-Hao Zhang Mo-han Zhang Qi-Wei Zhang Xian-Peng Zhang Yu-Liang Zhang yue Zhang Zhi-Yong Zhang Mao-Yuan Zhao Lu-Ping Zhou Zhi-Hao Zhou Ke-Jun Zhu Sino-French Institute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China Institute of High-Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Spallation Neutron Source Science Center Dongguan 523803China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Particle Detection and Electronics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China USTC Archaeometry Laboratory University of Science and Technology of ChinaHefei 230026China Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621900China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China Northwest Institute of Nuclear Technology Xi’an 710024China University of Chinese Academy of Sciences Beijing 100049China

Nondestructive and noninvasive neutron assays are essential applications of neutron *** resonance transmission analysis(NRTA)is a powerful nondestructive method for investigating the elemental composition of an *** back-streaming neutron line(Back-n)is a newly built time-of-flight facility at the China Spallation Neutron Source(CSNS)that provides neutrons in the eV to 300 MeV range.A feasibility study of the NRTA method for nuclide identification was conducted at the CSNS Back-n via two test *** results demonstrate that it is feasible to identify different elements and isotopes in samples using the NRTA method at *** study reveals its potential future applications.

关键词： CSNS White neutron beam NRTA Nuclide identification Nondestructive method

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基于景观格局的玉溪市“三湖”流域生态风险演化分析

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水生态学杂志 2024年第2期45卷 54-62页

作者：孙咏琦李约翰李强军陈永志刘士鑫李言龙李建华云南农业大学水利学院云南昆明650201 云南农业大学自然资源科学技术工程研究中心云南昆明650201 云南省地矿测绘院有限公司云南昆明650218 云南农业大学资源与环境学院云南昆明650201

以玉溪市“三湖”流域为研究对象,对研究区内生态风险状况进行研究,揭示其20年生态风险演化特征。对2000-2020年的土地利用数据进行等间距采样,基于景观格局指数建立生态风险模型并利用空间自相关分析、地统计学分析、重心转移等方法对... 详细信息

以玉溪市“三湖”流域为研究对象,对研究区内生态风险状况进行研究,揭示其20年生态风险演化特征。对2000-2020年的土地利用数据进行等间距采样,基于景观格局指数建立生态风险模型并利用空间自相关分析、地统计学分析、重心转移等方法对研究区内景观格局变化特征以及生态风险演变进行探究。结果表明:(1)社会发展及人类活动导致建筑用地的分离度等在研究期内呈线性减少趋势,而草地的破碎度在20年里呈上升趋势,由2000年的0.55增长到2020年的0.93;(2)生态风险格局在空间上呈现显著正相关,Moran’s I指数由2000年的0.522下降至2022年的0.513,表明研究区内景观生态风险值在空间分布上的依赖性减弱,空间趋同性逐渐降低;(3)研究区内多年间生态风险呈现先上升后下降的趋势且生态风险格局重心整体向西南偏移,高风险区主要分布在研究区北部的林草地带以及湖泊周围,20年面积增加了6 212.07 hm^(2)。研究结果可为流域内水资源开发、生态安全保护等决策提供支持。

关键词：生态风险景观格局指数标准差椭圆空间自相关地统计学玉溪市

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BSA联合转录组分析发掘西瓜叶片黄化候选基因

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江苏农业学报 2024年第1期40卷 165-173页

作者：张朝阳程瑞徐兵划顾妍黄大跃孙玉东江苏徐淮地区淮阴农业科学研究所/淮安市设施蔬菜重点实验室江苏淮安223001

叶片是植物重要的功能器官之一,不仅是植株进行光合作用的主要场所,也可作为重要的形态标记,应用于育种中。叶片颜色作为形态标记,不仅可用于苗期杂种的清除,亦可用于种子纯度的测定。以西瓜全生育期叶片黄化突变体纯合自交系ly104为母... 详细信息

叶片是植物重要的功能器官之一,不仅是植株进行光合作用的主要场所,也可作为重要的形态标记,应用于育种中。叶片颜色作为形态标记,不仅可用于苗期杂种的清除,亦可用于种子纯度的测定。以西瓜全生育期叶片黄化突变体纯合自交系ly104为母本(P_(1))、绿叶自交系w3为父本(P_(2)),通过杂交创制F_(1)代、F_(2)代、BC_(1)代群体。遗传分析结果表明,该突变体的叶片黄化由单隐性基因控制。采用混合分组分析(BSA)进行初定位,通过简化基因组测序(RAD)开发全基因组单核苷酸多态性(SNP)标记构建西瓜高密度遗传图谱,将西瓜叶片黄化基因定位于2号染色体13950306~15517591 bp(大小约为1.57 Mb)。以西瓜97103v2为参考基因组,该区间包含24个注释基因。对P_(1)(P1Y)、P_(2)(P2G)和F 2代群体中黄叶(F2Y)、绿叶(F2G)株系进行转录组水平分析,结果表明,目标区间内基因Cla97C02G035950、Cla97C02G036010、Cla97C02G036020、Cla97C02G036060在黄化叶片与正常绿叶材料中的表达量差异显著,可能是西瓜叶片的黄化候选基因。研究结果可为进一步解析西瓜叶片黄化基因功能和生物学特性奠定重要基础。

关键词：西瓜黄化 BSA 遗传图谱基因定位

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苏合香品种变迁考

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中国中药杂志 2024年第6期49卷 1690-1698页

作者：丁一明吴孟华 ERIC Brand 孙鑫刘越郭晓晗魏胜利马双成赵中振北京中医药大学中药学院北京100029 北京中医药大学本草纲目研究所北京100029 中国食品药品检定研究院北京102629 暨南大学岭南传统中药研究中心广东广州510632 北京中医药大学中医学院北京100029 香港浸会大学中医药学院中国香港00852

苏合香为我国常用进口中药材,在汉代即传入我国,苏合香作为中药始载于《名医别录》。该文通过梳理古今中外本草、现代文献资料,并结合对苏合香产地的实地考察结果,对苏合香的名称、质量评价、基原、产地及采收加工进行了系统的品种变迁... 详细信息

苏合香为我国常用进口中药材,在汉代即传入我国,苏合香作为中药始载于《名医别录》。该文通过梳理古今中外本草、现代文献资料,并结合对苏合香产地的实地考察结果,对苏合香的名称、质量评价、基原、产地及采收加工进行了系统的品种变迁考证。结果表明,自古以来苏合香便存在基原不明、产地不清的情况。我国历代医药学家多从质地、黏稠度、气味浓度、颜色4个方面对苏合香进行质量评价。苏合香品种共发生过2次变迁,第一次变迁可能在隋唐时期,基原由南欧安息香Sty⁃rax officinalis变迁为苏合香树Liquidambar orientalis。第二次变迁在近现代,基原由苏合香树变迁为北美枫香树***。在基原第二次变迁的同时,产地发生了第一次变迁,由小亚细亚南部地区的土耳其、叙利亚等国变迁为中美洲地区及北美洲南部地区的洪都拉斯、危地马拉等国。该文对苏合香质量评价、基原、产地、性状与采收加工等多方面的历史沿革进行了考证,同时对苏合香在西方国家的应用进行了综述,可为苏合香的进一步开发利用提供历史依据。

关键词：苏合香品种基原进口药材质量评价

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Delayed-onset adenosine deaminase deficiency with a novel synonymous mutation and a case series from China

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World Journal of Pediatrics 2023年第7期19卷 687-700页

作者： yue Zhang Wei Liu Zhou Shu Yan Li Fei sun Zhi-Gang Li Tong-Xin han hua-Wei Mao Tian-You Wang Department of Immunology Beijing Children's HospitalCapital Medical UniversityNational Center for Children's HealthNo.56 Nan Lishi RoadXicheng DistrictBeijing 100045China Hematology Oncology Center Henan Children's HospitalChildren's Hospital Affiliated of Zhengzhou UniversityZhengzhou Children's HospitalZhengzhouChina Hematologic Disease Laboratory Beijing Pediatric Research InstituteBeijing Children's HospitalCapital Medical UniversityNational Center for Children's HealthBeijingChina Hematology Center Beijing Children's HospitalCapital Medical UniversityNational Center for Children's HealthNo.56 Nan Lishi RoadXicheng DistrictBeijing 100045China Beijing Key Laboratory of Pediatric Hematology Oncology National Key Discipline of PediatricsCapital Medical UniversityBeijingChina Key Laboratory of Major Diseases in Children Ministry of EducationBeijingChina

Background Adenosine deaminase(ADA)is a key enzyme in the purine salvage *** defects of the ADA gene can cause a subtype of severe combined *** date,few Chinese cases have been *** We retrospectively reviewed the medical records of patients diagnosed with ADA deficiency in Beijing Children's Hospital and summarized the previously published ADA deficiency cases from China in the *** Nine patients were identified with two novel mutations(W272X and Q202=).Early-onset infection,thymic abnor-malities and failure to thrive were the most common manifestations of Chinese ADA-deficient *** ADA genotype has a major effect on the clinical ***,a novel synonymous mutation(c.606G>A,p.Q202=)was identified in a delayed-onset patient,which affected pre-mRNA splicing leading to a frameshift and premature truncation of the ***,the patient showed γδT cells expansion with an increased effect or phenotype,which may be associated with the delayed onset of *** addition,we reported cerebral aneurysm and intracranial artery stenosis for the first time in ADA *** patients died with a median age of four months,while two patients received stem cell transplantation and are *** This study described the first case series of Chinese ADA-deficient ***-onset infection,thymic abnormalities and failure to thrive were the most common manifestations in our *** identified a synonymous muta-tion that affected pre-mRNA splicing in the ADA gene,which had never been reported in ADA ***,we reported cerebral aneurysm in a delayed-onset patient for the first *** study is warranted to investigate the underlying mechanisms.

关键词： Adenosine deaminase deficiency Cerebral aneurysm Gamma delta Severe combined immunodeficiency Synonymous mutation

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Distribution of wetlands and salt lakes in the Yadong region of Tibet based on remote sensing, and their geo-climatic environmental changes

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China Geology 2022年第4期5卷 637-648页

作者： Ang sun Qing-hua Yang Zhi Liu hua Chen Lei han Shou-min Jiang yue-yue Meng Yu Bian Yong-peng Yang China Aero Geophysical Survey and Remote Sensing Center for Natural Resources China Geological SurveyBeijing 100083China Sichuan Geological Survey Institute Chengdu 610036China

Based on the 16 scenes GF-1 satellite multi-spectral remote sensing images,through the adoption of data processing methods including orthorectification,geometric rectification,data fusion and image mosaic,integrated with field surveys,the remote sensing interpretation signs for the inland wetland types have been built,and the remote sensing survey of inland wetlands in Yadong region has been initiated,with six types of inland wetlands recognized in Yadong region,namely permanent rivers,seasonal rivers,lakes,salt lakes,alpine meadows,and inundated *** spatial distribution characteristics and the spreading rules of these wetlands have also been *** on full understanding of the overall characteristics of the inland wetlands in the Yadong region,using the three phases of TM images acquired in 1989,2003 and 2008 as well as the PMS2 data gathered by GF-1 in 2014,and the wide-range data(WFV3)gathered by GF-1 in *** to the typical salt lakes,a long-time salt lakes transition study was carried *** results show that the typical salt lakes in Yadong have been shrinking in the past three *** average annual shrinkage of Duoqing Co(Co means lake in Tibetan)was stronger than that of Gala Co,which are respective 87.30 hectares(usually short as ha;1 ha equals to 0.01 km^(2))/a and 24.20 ha/a;the shrinkage degree of Gala Co was higher than that of Duoqing Co,shrank by 59.27% and 35.73% *** on the remote sensing survey results and an integrated analysis of the predecessors’researchers,the reason for the shrinkage of the salt lakes is more inclined to geological *** process is manifested by a series of extensional faults at the bottom of the lake basin generated from tectonic activities,providing fluid infiltration channels,and inducing the eventual leakage of lake water to the lower *** result provides an important instance for understanding the evolution characteristics of wetlands and salt lakes in specific environ

关键词： Yadong Wetlands Salt lakes Duoqing Co Gala Co Geological survey engineering Tibet Plateau

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