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Thermal stability of permafrost under U-shaped crushed rock embankment of the Qinghai-Tibet Railway

Advances in Climate Change Research 2024年第1期15卷 158-169页

作者： Kun-Ming XU guan-li JIANG Ji CHEN Qing-Bai WU State Key Laboratory of Frozen Soil Engineering Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China Beiluhe Observation Station of Frozen Soil Environment and Engineering Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou730000China

The U-shaped crushed rock embankment(UCRE),of which widely utilized in the permafrost regions along the Qinghai-Tibet Railway,has the capability to rapidly reduce the ground temperature of the underlying ***,there remains uncertainty regarding the adaptation of UCRE to climate change and its long-term cooling *** study focuses on nine UCRE monitoring sites along the Qinghai-Tibet Railway to analyze the dynamic variations of the ground temperature underlying permafrost from 2006 to *** efficiency of UCRE in stabilizing permafrost temperature in different permafrost zones is evaluated by considering the permafrost table,ground temperature,and MAGT,as well as the temperature difference between the top and bottom of the crushed rock layer and the ground temperature variation index(GTVI).The results show that UCRE is suitable for application in extremely unstable warm permafrost regions where the MAGT is higher than-0.5℃.Moreover,UCRE effectively diminishes the disparity in permafrost thermal stability between the sunny and shaded shoulders of the *** short-term and long-term effect of cooling permafrost is experiencing a change related with permafrost ***,in stable cold permafrost regions with MAGT lower than-1.5℃,the long-term cooling effect of UCRE on permafrost seems to gradually di-minishes,but UCRE continues to fulfill the role of stabilizing the underlying permafrost thermal state over the *** results show that UCRE can quickly restore and stabilize the thermal state of permafrost in the early stages of construction,and adapt to the influence of future climate *** findings provide important guidance for understanding the variations of permafrost thermal stability beneath the embankment in permafrost regions,as well as for improving the embankment stability and operational safety of the Qinghai-Tibet Railway.

关键词： Qinghai-Tibet Railway U-shaped crushed rock embankment Climate change Permafrost zone Ground temperature variation index Long-term coolingrole

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Ultralight and hyperelastic SiC nanofiber aerogel spring for personal thermal energy regulation

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Journal of Advanced Ceramics 2022年第8期11卷 1235-1248页

作者： limeng SONG Bingbing FAN Yongqiang CHEN Qiancheng GAO Zhe li Hailong WANG Xinyue ZHANG li guan Hongxia li Rui ZHANG School of Material Science and Engineering Zhengzhou UniversityZhengzhou 450001China School of Materials Science and Engineering Luoyang Institute of Science and TechnologyLuoyang 471023China School of Materials Science and Engineering Zhengzhou University of AeronauticsZhengzhou 450015China Sinosteel Luoyang Institute of Refractories Research Co. Ltd.Luoyang 471039China

Multifunctionalization is the development direction of personal thermal energy regulation equipment in the ***,it is still a huge challenge to effectively integrate multiple functionalities into one *** this study,a simple thermochemical process was used to prepare a multifunctional SiC nanofiber aerogel spring(SiC NFAS),which exhibited ultralow density(9 mg/cm3),ultralow thermal conductivity(0.029 W/(m·K)at 20℃),excellent ablation and oxidation resistance,and a stable three-dimensional(3D)structure that composed of a large number of interlacing 3C-SiC nanofibers with diameters of 300–500 nm and lengths in tens to hundreds of ***,the as-prepared SiC NFAS displayed excellent mechanical properties,with a permanent deformation of only 1.3%at 20℃after 1000 ***,the SiC NFAS exhibited robust hyperelasticity and cyclic fatigue resistance at both low(~-196℃)and high(~700℃)*** to its exceptional thermal insulation performance,the SiC NFAS can be used for personal thermal energy *** results of the study conclusively show that the SiC NFAS is a multifunctional material and has potential insulation applications in both low-and high-temperature environments.

关键词： SiC nanofiber aerogel spring(SiC NFAS) mechanical property thermal insulation personal thermal energy regulation

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Early Biomarkers in 1H Nuclear Magnetic Resonance Spectroscopy of Striatal Pathological Mechanisms after Acute Carbon Monoxide Poisoning in Rats

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Biomedical and Environmental Sciences 2015年第10期28卷 728-737页

作者： guan li li Zong Yang ZHANG Yan lin CONG Cui Cui ZHAO Jin Yuan Research Center of Occupational Medicine Peking University Third Hospital

Objective In vivo Proton Magnetic Resonance Spectroscopy （1H-MRS） can be used to evaluate the levels of specific neurochemical biomarkers of pathological mechanisms in the brain. Methods We conducted T2-Weighted Magnetic Resonance Imaging （MRI） and 1H-MRS with a 3.0-Tesla animal MRI system to investigate the early microstructural and metabolic profiles in vivo in the striatum of rats following carbon monoxide （CO） poisoning. Results Compared to baseline, we found significant cortical surface deformation, cerebral edema changes, which were indicated by the unclear gray/white matter border, and lateral ventricular volume changes in the brain. A significant reduction in the metabolite to total creatine （Cr） ratios of N-acetylaspartate （NAA） was observed as early as 1 h after the last CO administration, while the lactate （Lac） levels increased marginally. Both the Lac/Cr and NAA/Cr ratios leveled off at 6 h and showed no subsequent significant changes. In addition, compared to the control, the choline （Cho）/Cr ratio was slightly reduced in the early stages and significantly increased after 6 h. In addition, a pathological examination revealed mild cerebral edema on cessation of the insult and more severe cerebral injury after additional CO poisoning. Conclusion The present study demonstrated that 1H-MRS of the brain identified early metabolic changes after CO poisoning. Notably, the relationship between the increased Cho/Cr ratio in the striatum and delayed neuropsychologic sequelae requires further research.

关键词： Carbon monoxide poisoning Magnetic resonance spectroscopy Delayed neuropsychologic sequelae Choline

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Collective Excitations and Nonlinear Dynamics of 1D BEC with Two-and Three-body Interactions in Anharmonic Traps

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Communications in Theoretical Physics 2008年第11期50卷 1129-1136页

作者： li guan-Qiang PENG Ping liU Jian-Ke XUE Ju-Kui Faculty of Science Shaanxi University of Science and Technology Xi＇an 710021 China physics and Electronics Engineering College Northwest Normal University Lanzhou 730070 China

The collective excitations of low-dimensional Bose-Einstein condensates with two- and three-body interactions in anharmonic potentials are investigated. Using the standard variational approach, the governing equations of motions for the low-energy excitations are obtained by solving time-dependent Gross-Pitaevskii-Ginzburg equation, and the excitation spectrums are calculated in small amplitude limit. The frequency shift and nonlinear mode coupling induced by the anharmonic distortion （adding cubic, quartic, or quintic terra to a harmonic trap） are studied.

关键词： collective excitations Gross-Pitaevskii-Ginzburg equation anharmouic trapping potentials frequency shift of low-energy excitations non-resonant mode coupling

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Optimization of horizontal well staggered patterns

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Petroleum Science 2008年第4期5卷 348-352页

作者： Zhao Chunsen li Peijing guan Dan liu Qingjuan Department of Petroleum Engineering Daqing Petroleum Institute Daqing Heilongjiang 163318 China

Staggered line-drive patterns are widely used in oilfields. In this paper, to optimize a staggered pattern of horizontal wells, a 3D problem was divided into two 2D （x-y plane andy-z plane） problems with the pseudo-3D method, conformal transformation and superposition principle. A productivity equation for a horizontal well was deduced, which can be used to optimize the well pattern. A relationship between the length of horizontal wells and the shape factor of well patterns was established. The result shows that optimized well patterns can improve oil production from horizontal wells. This provides a theoretical basis for horizontal well applications to the development of oilfields, especially for overall development of oilfields by horizontal wells.

关键词： Horizontal well productivity calculation optimization of well pattern

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Quality of life scales for patients with gastroesophageal reflux disease:A literature review

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International Journal of Nursing Sciences 2015年第1期2卷 110-114页

作者： Xiao-li guan Hui Wang Nursing Department Tongji Hospital of Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina

Gastroesophageal reflux disease(GERD)is a common chronic disease of the gastrointestinal tract that occurs in 3.1%of the Chinese population[1].Heartburn,acid regurgitation and epigastric pain are typical clinical symptoms of *** symptoms can affect patients'work productivity,sleep,diet and daily activities,thus resulting in a reduced quality of life(QOL)[2].Although patient QOL is increasingly being considered as a medical outcome index in the evaluation of the impact of GERD symptoms on patients'health status,measuring patient QOL in clinical trials can be challenging due to the lack of a standard assessment ***,we aim to review the commonly used generic,disease-specific and hybrid QOL questionnaires to evaluate patients with GERD to provide a reference for clinical nursing work.

关键词： Gastroesophageal reflux disease Quality-of-life scale literature review

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The Antioxidant Effects of Complexes of Tilapia Fish Skin Collagen and Different Marine Oligosaccharides

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Journal of Ocean University of China 2010年第4期9卷 399-407页

作者： REN Shuwen li Jing guan Huashi Key Laboratory of Marine Drugs Ministry of Education School of Medicine and Pharmacy Ocean Universityof China Qingdao 266003 P. R. China.

An excess of reactive oxygen species（ROS）leads to a variety of chronic health *** potent antioxidants,marine bioactive extracts containing oligosaccharides and peptides have been extensively ***,there is a growing interest in protein-polysaccharide complexes because of their potential uses in pharmaceutical and food ***,only few studies are available on the antioxidant activities of such complexes,in terms of their ROS scavenging *** this study,we combined and superoxide radicals,and to evaluate the influences on the activities of superoxide dismutase（SOD）,glutathione peroxidase（GSH-Px）and the level of malondialdehyde（MDA）in UV-induced photoaging *** results indicated that the antioxidant activities of all the complexes were stronger than those of their individual *** the 11 complexes tested,two complexes,namely MA1000＋CP and κ-ca3000＋CP,turned out to be highly effective *** the detailed mechanisms of this improved scavenging ability are not fully understood,this work provides insights into the design of highly efficient peptide-oligosaccharide complexes for potential applications in pharmaceutical,cosmetics and food industries.

关键词： antioxidant activity marine bioactive extracts collagen peptides marine oligosaccharides UV-irradiation.

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QTDMAC:MAC protocol for QoS support in MANET using smart antennas

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重庆邮电大学学报（自然科学版） 2009年第2期21卷 262-266页

作者： ZHANG Ying-chao guan li-li College of Information and Control Nanjing Information Science and Technology University Nanjing 210044 P. R. China

Unlike directional antennas, smart antennas offer MANET (Mobile Ad hoc Net works) potential increases in their achievable throughput and capacity. Based on the development of smart antenna technology, we studied the MAC protocol for QoS support was studied, which becomes the hot issue in multimedia services. The protocol divides the channel into the data channel and the control channel, node sends forecast guarantee to compete the channel. And after completing the RTS / CTS handshake appointment, node is reserved for data transmission. Node can send Busy Tones to prevent the problem of the deafness nodes and hidden terminal. At last if the direct link between the sender and receiver has low quality and low rate, data packets may be delivered faster through a relay node. Through the analytical results, QTDMAC with the protocol IEEE802.1 and DMAC were compared. The QTDMAC protocol is proved the superiority in throughput and the real-time delay business.

关键词： MANET网络智能天线技术 QoS支持 MAC协议多媒体服务议定书定向天线移动Ad

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Therapies for children with cerebral palsy A Web of Science-based literature analysis

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Neural Regeneration Research 2012年第33期7卷 2632-2639页

作者： Yaping Mu Na li lijun guan Chunnan Wang Shuyun Shang Yan Wang Shenyang Children's Hospital Shenyang 110032 Liaoning Province China

OBJECTIVE： To identify global research trends in three therapies for children with cerebral palsy. DATA RETRIEVAL： We performed a bibliometric analysis of studies on therapies for children with cerebral palsy from 2002 to 2011 retrieved from Web of Science. SELECTION CRITERIA： Inclusion criteria：（a） peer-reviewed published articles on botulinum toxin, constraint-induced movement therapy, or acupuncture for children with cerebral palsy indexed in Web of Science; （b） original research articles, reviews, meeting abstracts, proceedings papers, book chapters, editorial material, and news items; and （c） publication between 2002 and 2011. Exclusion criteria：（a） articles that required manual searching or telephone access; （b） documents that were not published in the public domain; and （c） a number of corrected papers from the total number of articles. MAIN OUTCOME MEASURES：（1） Number of publications on the three therapies; （2） annual publication output, distribution by journals, distribution by institution, and top-cited articles on botulinum toxin; （3） annual publication output, distribution by journal, distribution by institution, and top-cited articles on constraint-induced movement therapy; （4） annual publication, distribution by journal, distribution by institution, and top-cited articles on acupuncture. RESULTS： This analysis, based on Web of Science articles, identified several research trends in studies published over the past 10 years of three therapies for children with cerebral palsy. More articles on botulinum toxin for treating children with cerebral palsy were published than the articles regarding constraint-induced movement therapy or acupuncture. The numbers of publications increased over the 10-year study period. Most papers appeared in journals with a focus on neurology, such as Developmental Medicine and Child Neurology and Journal of Child *** institutes publishing on botulinum toxin treatments for this population are mostly in the Neth

关键词： constraint-induced movement therapy botulinum toxin acupuncture cerebral palsy nerve injury infant children brain Web of Science bibliometric neural regeneration

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Structure-dependent electromagnetic wave absorbing properties of bowl-like and honeycomb TiO_(2)/CNT composites

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Journal of Materials Science & Technology 2022年第14期109卷 105-113页

作者： Hua Jian Qinrui Du Qiaoqiao Men li guan Ruosong li Bingbing Fan Xin Zhang Xiaoqin Guo Biao Zhao Rui Zhang Henan Key Laboratory of Aeronautical Materials and Application Technology School of Material Science and EngineeringZhengzhou University of AeronauticsZhengzhou 450046China School of Chemical Engineering Northwest UniversityXi’an 710069China Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China Zhengzhou Research Institute for Abrasives&Grinding Co. Ltd.Zhengzhou 450001China School of Material Science and Engineering Luoyang Institute of Science and TechnologyLuoyang 471023China

Materials that can efficiently absorb electromagnetic waves(EMWs)are required to deal with electromagnetic *** design appears to be an efficient way to improve the EMW-absorption performance of such materials,particularly when adjustment of the constitution or mixing ratio is *** this study,bowl-like and honeycomb titanium dioxide/carbon nanotube(TiO_(2)/CNT)composites with different CNT contents were fabricated using the methods of hierarchical and mixing vacuum-assisted filtration,*** to the honeycomb structure,the bowl-like structure simultaneously facilitated greater interfacial polarization and conduction loss in favor of dielectric polarization,and augmented multiple *** high porosity of the honeycomb structure was conducive to optimizing the impedance matching *** bowl-like TiO_(2)/CNT composite exhibited a minimum reflection loss(RL_(min))of-38.6 dB(1.5 mm)with a wide effective absorption band(EAB;like and honeycomb TiO_(2)/CNT composites are ideal candidates for light-weight and highly efficient EMW-absorbing materials.

关键词： Bowl-like structure Honeycomb structure TiO_(2)/CNT composite Electromagnetic wave absorption

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