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From arc-continent collision to ocean closure: Lower Cretaceous Shamuluo Formation in the western segment of the Bangong-Nujiang suture zone, central Tibet

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Geoscience Frontiers 2021年第5期12卷 309-326页

作者： An-bo Luo jian-Jun Fan bo-Chuan Zhang jian-Zhen Zhang Hang Li Meng-Long Duan College of Earth Sciences Jilin UniversityChangchun 130061China Key Laboratory of Mineral Resources Evaluation in Northeast Asia Ministry of Natural ResourcesChangchun 130061China Hebei Institute of Regional Geological Survey Langfang 065000HebeiChina

One of most hotly debated topics concerning the Late Mesozoic evolution of Tethyan and the Tibetan Plateau is the timing of the closure of the Meso-Tethys ocean,which is represented by the Bangong-Nujiang suture *** Upper Jurassic-Lower Cretaceous Shamuluo Formation,which unconformably overlies the older Mugagangri Group accretionary complex,provides important information on the closure of the Meso-Tethys *** paper precisely confines the depositional age of the Shamuluo Formation in the western segment of the Bangong-Nujiang suture zone,extending it from the Late Jurassic to the *** with the results of previous studies,we suggest that the Shamuluo Formation in the Awengco-Baerqiong region mainly contains a bathyal Berriasian-Hauterivian subunit and a shallow-marine Albian *** analysis indicates that the Berriasian-Hauterivian subunit was mainly derived from the Jurassic southern Qiangtang magmatic arc,while the Albian subunit was derived from the coeval volcanic rocks and the Upper Carboniferous-Upper Permian strata in the southern Qiangtang ***,the two subunits of the Shamuluo Formation have significant distinct sedimentary facies and provenances,indicating that they were deposited in different tectonic *** on the regional geological data,we suggest that the bathyal Berriasian-Hauterivian subunit and the shallow-marine Albian subunit of the Shamuluo Formation should be interpreted as a record of the oceanic arc-continent collision and the Lhasa-Qiangtang soft-collision,***,the closure time of the Meso-Tethys Ocean is at least limited to the Albian.

关键词： Tibetan Plateau Meso-Tethys Ocean Shamuluo Formation Ocean closure Albian

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Effect of Ag Addition on Microstructure,Mechanical and Corrosion Properties of Mg-Nd-Zn-Zr Alloy for Orthopedic Application

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Acta Metallurgica Sinica(English Letters) 2023年第2期36卷 295-309页

作者： Yu-Jin Nie jian-Wei Dai Xiao-bo Zhang School of Materials Science and Engineering Nanjing Institute of TechnologyNanjing211167China jiangsu Key Laboratory of Advanced Structural Materials and Application Technology Nanjing211167China

The as-extruded Mg-3Nd-0.2Zn-0.4Zr-xAg(x=0,0.2,0.5,1 wt%)alloys were prepared for biomedical *** electron microscope,electron backscattered diffraction,X-ray diffraction,tensile test machine,electrochemical workstation,and immersion experiments were used to study microstructures,mechanical properties,and corrosion behavior of the as-extruded *** results indicate that the microstructures of all the as-extruded alloys are composed of coarse undynamic recrystallized grains,fine equiaxed recrystallized grains,and precipitated *** element plays a positive role in promoting dynamic recrystallization and grain *** during the extrusion,all the four alloys generate a //ED fiber *** the increase of Ag element,the volume fraction of Mg_(12)Nd phase increases and then decreases *** increasing Ag addition,both yield strength and ultimate tensile strength of the as-extruded alloys reduce first and then improve,and the elongation improves gradually from 9.4 to 12.7%.More importantly,the addition of Ag accelerates corrosion of the as-extruded alloys in simulated body fluid,and all the as-extruded alloys show uniform corrosion mode.

关键词： Magnesium alloy Hot extrusion Mechanical properties Corrosion resistance

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Comparison of AC breakdown characteristics on insulation paper (pressboard) immersed by three-element mixed insulation oil and mineral oil

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High Voltage 2020年第3期5卷 298-305页

作者： Dawei Feng jian Hao Lijun Yang Ruijin liao Xin Chen jian Li State Key Laboratory of Power Transmission Equipment and System Security and New Technology School of Electrical EngineeringChongqing UniversityChongqing 400044People's Republic of China

Insulation oil is an important dielectric in power devices,and many studies on mixed insulation oil have been conducted in recent years to improve the performance of insulation *** replace mineral oil directly,the authors previously developed a novel three-element mixed insulation oil successfully;the main parameters of which satisfy the IEC 60296-2012 standard for mineral *** the present study,the AC breakdown properties of insulation paper(pressboard)immersed by the new mixed oil and naphthenic mineral oil were *** both insulation oils,the increase in temperature cannot significantly reduce the breakdown strength of oil-immersed insulation paper(pressboard)at a low moisture content,and the increment of moisture content cannot reduce the breakdown voltage at a low temperature(25℃).The breakdown voltage decreases only when the two factors increase *** the mixed and mineral oils,the AC breakdown voltage of oilimmersed paper(pressboard)with different thicknesses has significant *** mineral oil has a high breakdown voltage for the thin insulation paper,whereas the mixed oil has a high breakdown voltage when the thickness of the insulation paper(pressboard)exceeds 0.2 *** phenomenon is mainly caused by the breakdown field strength that varies with the increase of dielectric thickness and the different change trends of paper(pressboard)immersed with the mixed and the mineral ***,the stack of thin multilayer insulation paper enables the mixed oil-immersed paper to have a higher breakdown strength than the mineral oil-immersed *** the AC breakdown voltage of oil-immersed pressboard with an oil-gap structure,the mixed oil is comprehensively superior to the mineral oil due to its larger relative permittivity.

关键词： insulation immersed breakdown

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Terminal Sliding Mode Control for Cyber Physical System Based on Filtering Backstepping

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International Journal of Automation and computing 2015年第5期12卷 497-502页

作者： Fei Li jian-bo Hu Lei Zheng jian-Hao Wang Equipment Management and Safety Engineering College Air Force Engineering University Unit 93286 People's Liberation Army

Based on a nonlinear flight dynamic model with aerodynamic coefficients and external disturbance uncertainties, which is a typical cyber physical system, a filtering backstepping terminal sliding mode control method is proposed for a robust *** tracking differentiator can provide the capability of solving the problem of 'complexity explosion' in backstepping controllers to simplify the backstepping implementation. Nonlinear disturbance observers are used to observe the uncertainties of the nonlinear flight dynamic system. The terminal sliding mode controller is designed to improve its convergence rate and the tracking accuracy. Finally,nonlinear 6-degree-of-freedom simulation results for an F-16 aircraft model elaborate the effectiveness of the proposed control system.

关键词： Cyber-physical system(CPS) disturbance uncertainti

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Effects of Particle Size on Nitridation Kinetics of Manganese Powder

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Journal of Iron and Steel Research International 2015年第6期22卷 543-550页

作者： Ting LUO jian-hua LIU Hong-bo LIU jian LIU Research Institute of Metallurgy Engineering University of Science and Technology Beijing

Isothermal thermo-gravimetric analysis was applied to investigate the nitridation kinetics of manganese powder with different particle sizes at 800, 900 and 1000 ℃. The apparent activation energy and nitridation kinetics equations of manganese powder with different particle sizes were obtained from unreacted shrinking core model and Arrhenius formula. It was found that the nitridation mechanism was controlied by interracial chemical reaction. The apparent activation energy and the apparent rate constant of nitridation reaction were affected by particle sizes. With the decrease of particle size, the apparent activation energy decreased whilst the apparent rate constant increased. It was suggested that the refinement of the manganese powder contributed to the increase of molar surface energy, which accounted for the lower apparent activation energy.

关键词： manganese powder nitridation isothermal thermo-gravimetric analysis apparent activation energy kinetics

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Spatiotemporal patterns of anuran functional diversity in temperate montane forests

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Zoological Research 2021年第4期42卷 412-416页

作者： Zi-jian Sun Wei Zhu Wen-bo Zhu Chun-Lin Zhao Chun-Lin liao Bei Zou Dan Xu Wen-bo Fan Sheng-Qi Su jian-Ping jiang Tian Zhao CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization&Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province Chengdu Institute of BiologyChinese Academy of SciencesChengduSichuan 610041China College of Fisheries Southwest UniversityChongqing 400715China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Bio-Resources and Eco-Environment of the Ministry of Education College of Life SciencesSichuan UniversityChengduSichuan 610064China National Nature Reserve of Badagongshan SangzhiHunan 427100China School of Biology Sciences University Sains MalaysiaPenang 11800Malaysia

Functional diversity is an integrative approach to better understand biodiversity across space and *** the present study,we investigated the spatiotemporal patterns(i.e.,elevation and season)and environmental determinants of anuran functional diversity on Tianping Mountain,northwest Hunan,***,10 transects were established from low(300 m a.s.l.)to high(1492 m a.s.l.)elevations,and anuran communities were sampled in spring,early summer,midsummer,and autumn in *** functional diversity indices were computed for each transect in each season using ecomorphological functional *** results demonstrated that these indices had contrasting responses to increasing ***,they did not differ significantly among seasons in terms of temporal ***,the unique spatiotemporal functional diversity patterns were impacted by distinct environmental variables,such as leaf litter cover,water temperature,number of trees,and water conductivity.

关键词： traits functional indices

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近二十年中国旅游目的地品牌建设研究综述

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江苏商论 2025年第1期 53-57页

作者：陈楠李博周健美河南大学研学旅行研究中心文化旅游学院河南开封475001

旅游地品牌建设是提升地方旅游竞争力的重要手段。以CNKI数据库2000—2022年收录的612篇国内旅游地品牌建设研究文献为样本数据,借助Cite Space对现有研究成果进行可视化分析,揭示近二十年来国内旅游地品牌建设的研究脉络和趋势特征。... 详细信息

旅游地品牌建设是提升地方旅游竞争力的重要手段。以CNKI数据库2000—2022年收录的612篇国内旅游地品牌建设研究文献为样本数据,借助Cite Space对现有研究成果进行可视化分析,揭示近二十年来国内旅游地品牌建设的研究脉络和趋势特征。结果显示:(1)研究自2000年起逐渐引起国内学者关注,2000—2022年发文量总体呈现曲折式增长趋势。(2)研究热点围绕乡村旅游、文化旅游、红色旅游、冬奥会等不同主体类型,基于品牌构建的不同过程展开,城市旅游品牌建设备受关注。(3)跨机构、不同学者之间的交流合作不足,缺乏跨学科的旅游地品牌研究成果。(4)未来研究中,一要推动旅游地品牌的跨学科研究,借助数理模型和量化方法,实现对文旅融合、乡村旅游等现有热点的纵向挖掘;二要积极拓展横向的研究范围,把握以冰雪项目为主的体育旅游品牌建设、媒体融合背景下的目的地品牌建设等潜在趋势,立足横向与纵向两个维度,完善目的地品牌建设的内容体系。

关键词：旅游地品牌品牌建设热点趋势 Cite Space

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Study on chronic pancreatitis and pancreatic cancer using MRS and pancreatic juice samples

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World Journal of Gastroenterology 2011年第16期17卷 2126-2130页

作者： jian Wang Chao Ma Zhuan liao Bing Tian jian-Ping Lu Department of Radiology Changhai Hospital The Second Military Medical University Shanghai 200433 China Department of Gastroenterology Changhai HospitalThe Second Military Medical University Shanghai 200433 China

AIM:To investigate the markers of pancreatic diseases and provide basic data and experimental methods for the diagnosis of pancreatic ***:There were 15 patients in the present study,among whom 10 had pancreatic cancer and 5,chronic *** all patients,pancreatic cancer or chronic pancreatitis was located on the head of the ***-thology da-ta-of a-ll p-a-tients wa-s confirmed by biopsy and *** the 10 patients with pancreatic cancer,3 people had a medical history of longterm alcohol *** 5 patients with chronic pancreatitis,4 men suffered from alcoholic chronic *** juice samples were obtained from patients by endoscopic retrograde *** resonance spectroscopyn was performed on an 11.7-T scanner (Bruker DRX-500) using Call-Purcell-Meiboom-Gill pulse *** parameters were as follows:spectral width,15 KHz;time domain,64 K;number of scans,512;and acquisition time,2.128 ***:The main component of pancreatic juice included leucine,iso-leucine,valine,lactate,alanine,acetate,aspartate,lysine,glycine,threonine,tyrosine,histidine,tryptophan,and *** performing 1D 1H and 2D total correlation spectroscopy,we found a triplet peak at the chemical shift of 1.19 ppm,which only appeared in the spectra of pancreatic juice obtained from patients with alcoholic chronic *** triplet peak was considered the resonance of the methyl of ethoxy group,which may be associated with the metabolism of alcohol in the ***:The triplet peak,at the chemical shift of 1.19 ppm is likely to be the characteristic metabolite of alcoholic chronic pancreatitis.

关键词： Pancreatic juice Pancreatic cancer Chronic pancreatitis Magnetic resonance spectroscopy Magnetic resonance imaging

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Development and validation of a nomogram for predicting metachronous peritoneal metastasis in colorectal cancer:A retrospective study

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World Journal of Gastrointestinal Oncology 2023年第1期15卷 112-127页

作者： bo Ban An Shang jian Shi Department of General Surgery The Second Hospital of Jilin UniversityChangchun 130041Jilin ProvinceChina

BACKGROUND Peritoneal metastasis(PM)after primary surgery for colorectal cancer(CRC)has the worst *** and early detection of metachronous PM(m-PM)have an important role in improving postoperative prognosis of ***,commonly used imaging methods have limited sensitivity to detect PM *** aimed to establish a nomogram model to evaluate the individual probability of m-PM to facilitate early interventions for high-risk *** To establish and validate a nomogram model for predicting the occurrence of m-PM in CRC within 3 years after *** We used the clinical data of 878 patients at the Second Hospital of Jilin University,between January 1,2014 and January 31,*** patients were randomly divided into training and validation cohorts at a ratio of 2:*** least absolute shrinkage and selection operator(LASSO)regression was performed to identify the variables with nonzero coefficients to predict the risk of *** logistic regression was used to verify the selected variables and to develop the predictive nomogram ***’s concordance index,receiver operating characteristic curve,Brier score,and decision curve analysis(DCA)were used to evaluate discrimination,distinctiveness,validity,and clinical utility of this nomogram *** model was verified internally using bootstrapping method and verified externally using validation *** LASSO regression analysis identified six potential risk factors with nonzero *** logistic regression confirmed the risk factors to be *** on the results of two regression analyses,a nomogram model was *** nomogram included six predictors:Tumor site,histological type,pathological T stage,carbohydrate antigen 125,v-raf murine sarcoma viral oncogene homolog B mutation and microsatellite instability *** model achieved good predictive accuracy on both the training and validation *** C-index,area under the curve,and

关键词： Colorectal cancer Metachronous peritoneal metastasis Risk factor Nomogram

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Performance Evaluation of Memory-Centric ARMv8 Many-Core Architectures:A Case Study with Phytium 2000+

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Journal of Computer Science & Technology 2021年第1期36卷 33-43页

作者： jian-Bin Fang Xiang-Ke liao Chun Huang De-Zun Dong College of Computer National University of Defense TechnologyChangsha 410073China

This article presents a comprehensive performance evaluation of Phytium 2000+,an ARMv8-based 64-core *** focus on the cache and memory subsystems,analyzing the characteristics that impact the high-performance computing *** provide insights into the memory-relevant performance behaviours of the Phytium 2000+system through *** the help of the well-known roofline model,we analyze the Phytium 2000+system,taking both memory accesses and computations into *** on the knowledge gained from these micro-benchmarks,we evaluate two applications and use them to assess the capabilities of the Phytium 2000+*** results show that the ARMv8-based many-core system is capable of delivering high performance for a wide range of scientific kernels.

关键词： many-core architecture memory-centric design performance evaluation

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