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Observed permafrost thawing and disappearance near the altitudinal limit of permafrost in the Qilian Mountains

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Advances in Climate Change Research 2022年第5期13卷 642-650页

作者： Wen SUN Tingjun ZHANG Gary D.CLOW Yan-Hua SUN Wen-Yu ZHAO Ben-Ben LIANG Cheng-Yan FAN xiao-qing peng Bin CAO Key Laboratory of Western China's Environmental Systems(Ministry of Education) College of Earth and Environmental SciencesLanzhou UniversityLanzhou 730000China Institute of Arctic and Alpine Research University of Colorado BoulderBoulder 80303USA National Tibetan Plateau Data Center Key Laboratory of Tibetan Environmental Changes and Land Surface ProcessesInstitute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China

Permafrost degradation has been widely reported on the Tibetan Plateau(TP).However,directly observed evidence of permafrost thawing processes and degradation rates are very limited,although it is expected to be prevalent near the periphery of a permafrost ***,we report permafrost changes and disappearance in the Qilian Mountains(northeastern TP)based on three boreholes instrumented along a 100 m transect during 2014–*** results show that permafrost has significantly degraded in the study area:the mean downward thawing rate from the permafrost table was about 0.16 m per year while the mean upward thawing rate from the permafrost base was about 0.23 m per *** estimate the mean lateral degradation rate of permafrost in this area was∼4.14 m per *** dramatically,the 1.5 m thick permafrost layer at one of the boreholes thawed completely between April of 2018 and December of *** results indicate that changes in climatic condition may have played only a limited role in controlling the active layer thickness in the vicinity of the altitudinal limit of permafrost;moisture content and soil conditions play key roles in site-specific permafrost *** study provides new quantitative insights for understanding changes near the altitudinal limit of permafrost,and we suggest that land surface models or Earth system model studies of the lateral heat exchanges should be implemented in order to better represent permafrost thawing processes.

关键词： Permafrost Permafrost degradation Permafrost lateral thawing Qilian Mountains

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铁路企业维权的措施与建议

铁道运输与经济 2005年第8期27卷 42-43页

作者：肖庆鹏昆明铁路局土地房产管理处云南昆明650011

当前假冒铁路名义,开办与铁路运输有关的企业,进行不正当竞争行为,给旅客和货主带来损害,也影响到铁路的声誉。根据有关法律,提出加强领导,设立专门管理机构,打击违法经营行为;铁路部门要对“路徽”申请专用注册,防止被滥用;整顿铁路商... 详细信息

当前假冒铁路名义,开办与铁路运输有关的企业,进行不正当竞争行为,给旅客和货主带来损害,也影响到铁路的声誉。根据有关法律,提出加强领导,设立专门管理机构,打击违法经营行为;铁路部门要对“路徽”申请专用注册,防止被滥用;整顿铁路商业用房等维权的措施建议。

关键词：铁路企业维权措施

Electrochemical conversion of methane to bridge the gap in the artificial carbon cycle

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Journal of Energy Chemistry 2025年第1期100卷 286-308页

作者： Yuhao peng Yuefeng Song Ihar Razanau Juanxiu xiao Wei xiao Di Hu Guoxiong Wang College of Chemistry and Molecular Sciences Hubei Key Laboratory of Electrochemical Power Sources Wuhan University State Key Laboratory of Catalysis Dalian National Laboratory for Clean Energy iChEM (Collaborative Innovation Center of Chemistry for Energy Materials) Dalian Institute of Chemical Physics Chinese Academy of Sciences Laboratory of Physical-Chemical Technologies SSPA Scientific and Practical Materials Research Centre of NAS of Belarus State Key Laboratory of Marine Resources Utilization in South China Sea Collaborative Innovation Center of Marine Science and Technology School of Marine Science and Engineering Hainan University Department of Chemical and Environmental Engineering University of Nottingham Ningbo China

Methane, an abundant one-carbon（C1） resource, is extensively used in the industrial production of vital fuels and value-added chemicals. However, current industrial methane conversion technologies are energy-and carbon-intensive, mainly due to the high activation energy required to break the inert C–H bond, low selectivity, and problematic side reactions, including CO2emissions and coke deposition. Electrochemical conversion of methane（ECM） using intermittent renewable energy offers an attractive solution, due to its modular reactor design and operational flexibility across a broad spectrum of temperatures and pressures. This review emphasizes conversion pathways of methane in various reaction systems, highlighting the significance and advantages of ECM in facilitating a sustainable artificial carbon cycle. This work provides a comprehensive overview of conventional methane activation mechanisms and delineates the complete pathways of methane conversion in electrolysis contexts. Based on surface/interface chemistry, this work systematically analyzes proposed reaction pathways and corresponding strategies to enhance ECM efficiency towards various target products, including syngas, hydrocarbons, oxygenates, and advanced carbon materials. The discussion also encompasses opportunities and challenges for the ECM process, including insights into ECM pathways, rational electrocatalyst design, establishment of benchmarking protocols, electrolyte engineering, enhancement of CH4conversion rates, and minimization of CO2emission.

关键词： Methane Electrochemical conversion Reaction mechanism Catalyst design Electrode Electrocatalysis

Observation of acoustic hybrid topological phases induced by the p-d orbital interactions

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 132-139页

作者： xiao Xiang Feng Gao Yu-Gui peng peng Wu Zong-Lin Li Xue-Feng Zhu School of Physics and Innovation Institute Huazhong University of Science and Technology

In spinless systems,growing attention has recently been attracted to synthetic gauge fields,which redefine the fundamental crystal symmetries by utilizing the projective algebraic ***,synthetic gauge fields have been commonly investigated in single orbital systems,and explorations on hybrid orbitals remain elusive in ***,we report the experimental observation of hybrid topological phases induced by hybrid synthetic gauge flux,which is formed by the interaction between p and d orbitals embedded in acoustic *** breaking the translation symmetries of Lxand/or Ly,we unambiguously demonstrate the first-order M?bius edge states and higher-order corner *** work establishes a platform for seeking exotic topological phases induced by hybrid-orbitals interactions and initializing the framework of hybrid-orbitalsrelated topological *** applications can be anticipated in scenarios such as high-quality sensing and robust wave trapping due to the stepwise energy distribution of the hybrid topological phase.

关键词： topological insulator synthetic gauge field projective symmetry corner states

A Line Detection Algorithm Based on Error Propagation

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A Line Detection Algorithm Based on Error Propagation

第二十六届中国控制会议

作者： Gao xiao qing,peng Tao College of computer Science,Wuhan University of Science and Engineering,Wuhan 430073,P.R.China

The line detection by traditional Hough Transform has two insufficiencies,one is computationally expensive and memory consuming,the other is the insufficiency of *** scheme adopts the principle of error propagation,analyses the error of line detection by Hough Transform in detail,and obtains the factors influencing the *** error not only de-pends on the noise of the image,but also depends on the distance of the line to origin.A 3×3 window is used to search the best-distinguished pixels and limit the scope *** on the best-distinguished pixels and error propagation,the al-gorithm can improve the accuracy of the line detection by *** computational efficiency of the scheme is not very well because of analyzing the error and finding the best-distinguished pixels,but for the application of high accuracy,it works well.

关键词： Error Propagation Hough Transform Line Detection Line Fitting

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三峡库区野生红三叶苗期抗旱性灰色关联分析

草业学报 2009年第3期18卷 255-259页

作者：何玮范彦王琳徐远东秦晓鹏彭燕重庆市畜牧科学院重庆400015 四川农业大学四川雅安625014

以三峡库区采集的9份野生红三叶和3份国内外品种为材料,在干旱胁迫下,测定其地上生物量、地下生物量和脯氨酸含量等10项指标,进行灰色关联度分析。结果表明,筛选出地下生物量、脯氨酸含量和叶绿素a含量3项可对红三叶抗旱性进行评价的指... 详细信息

以三峡库区采集的9份野生红三叶和3份国内外品种为材料,在干旱胁迫下,测定其地上生物量、地下生物量和脯氨酸含量等10项指标,进行灰色关联度分析。结果表明,筛选出地下生物量、脯氨酸含量和叶绿素a含量3项可对红三叶抗旱性进行评价的指标;根据红三叶抗旱性评估模型综合评估值(φK)得出材料的抗旱性排序为:瑞德(Red)>CQ5>CQ9>多丽(Dory)>CQ2>CQ4>CQ7>CQ3>CQ1>巫溪>CQ8>CQ6。

关键词：红三叶抗旱性灰色关联度分析

Reduced mesencephalic astrocyte-derived neurotrophic factor expression by mutant androgen receptor contributes to neurodegeneration in a model of spinal and bulbar muscular atrophy pathology

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Neural Regeneration Research 2025年第9期20卷 2655-2666页

作者： Yiyang Qin Wenzhen Zhu Tingting Guo Yiran Zhang Tingting Xing peng Yin Shihua Li xiao-Jiang Li Su Yang Guangdong Key Laboratory of Non-human Primate Research Key Laboratory of CNS Regeneration(Ministry of Education)Guangdong–HongKong–Macao Institute of CNS RegenerationJinan UniversityGuangzhouGuangdong ProvinceChina

Spinal and bulbar muscular atrophy is a neurodegenerative disease caused by extended CAG trinucleotide repeats in the androgen receptor gene,which encodes a ligand-dependent transcription facto *** mutant androgen receptor protein,characterized by polyglutamine expansion,is prone to misfolding and forms aggregates in both the nucleus and cytoplasm in the brain in spinal and bulbar muscular atrophy *** aggregates alter protein-protein interactions and compromise transcriptional *** this study,we reported that in both cultured N2a cells and mouse brain,mutant androgen receptor with polyglutamine expansion causes reduced expression of mesencephalic astrocyte-de rived neurotrophic *** n of mesencephalic astrocyte-derived neurotrophic factor amelio rated the neurotoxicity of mutant androgen receptor through the inhibition of mutant androgen receptor *** down endogenous mesencephalic astrocyte-derived neurotrophic factor in the mouse brain exacerbated neuronal damage and mutant androgen receptor *** findings suggest that inhibition of mesencephalic astrocyte-derived neurotrophic factor expression by mutant androgen receptor is a potential mechanism underlying neurodegeneration in spinal and bulbar muscular atrophy.

关键词： androgen receptor mesencephalic astrocyte-derived neurotrophic factor mouse model neurodegeneration neuronal loss neurotrophic factor polyglutamine disease protein misfolding spinal and bulbar muscular atrophy transcription factor

Cloning and Expression of the SDISP of Schistosoma japonicum Chinese Strain in ***

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Cloning and Expression of the SDISP of Schistosoma japonicum...

Effects of Bifidobacterium lactis BLa80 on fecal and mucosal flora and stem cell factor/c-kit signaling pathway in simulated microgravity rats

全国寄生虫学与热带医学学术研讨会

作者： YU Jun-long,WANG Shi-ping~(**),DAI Gan,JIANG xiao-Xin,ZEN Shao-hua,xiao xiao-qing, LIU Li-peng,ZHOU Sheng-hua,XU Shao-rui,LV Zhi-yue,peng Xing-chu,HE Zhuo,LI Wen-kai, WU Shi-jun,LIU Xue-qin. (Department of Pathogenic Biology,Central South University Xiangya School of Medicine,Changsha 4100 78,China)

[Objective]To perform cloning of the full-length gene encoding succinate dehydrogenase iron-sulfur protein of Chinese Schistosoma japonicum(SjSDISP) and its expression in Escherichia *** According to the published incomplete EST of SjSDISP and the sequence of multiclone sites ofλgt11 vector,2 pair of primers were designed.,then the 3’ and 5’ terminus of the expression sequence tag(EST) of the SjSDISP were amplified by anchored PCR from adult Schistosoma japonicum cDNA *** sequencing,the full-length cDNA sequence of the SjSDISP was obtained, subsequently were cloned into prokaryotic expression pGEX-4T-1 *** by agarosed gel electrophoresis, endonucleases digestion and PCR,the resultant recombinant plasmid was used for expression under the temperature-dependent condition and Western blot *** A 107 1bp sequence was *** analysis indicated that this fragment contained a complete open reading frame(ORF) of SjSDISP,which coding for a protein of 278 amino *** target fragment was cloned into the prokaryotic expression vector pGEX-4T-1,sequenced and expressed in Escherichia ***-PAGE revealed that the molecular weight of the expressed fusion recombinant product was 56kDa. Western-blot showed that the recombinant protein was recognized by polyclonal rabbit antiserum immunized with Schistosoma japonicum adult worm antigen,which indicated that the expressed product had good antigenicity. Conclusion Cloning of the full-length gene encoding SjSDISP and its bacterial expression were successfully made.

关键词： Schistosoma japonicum SDISP gene cloning gene expression

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World Journal of Gastroenterology 2025年第1期31卷 93-109页

作者： Ping Zhang Ying Zhu Pu Chen Tong Zhou Zhe-Yi Han Jun xiao Jian-Feng Ma Wen Ma peng Zang Ying Chen Graduate School Hebei North UniversityZhangjiakou 075000Hebei ProvinceChina Key Laboratory of Aerospace Nutrition and Food Engineering China Astronaut Research and Training CenterBeijing 100094China Department of Gastroenterology The Air Force Medical CenterBeijing 100142China Department of Blood Transfusion Air Force Medical CenterBeijing 100142China

BACKGROUND Simulated microgravity environment can lead to gastrointestinal motility *** pathogenesis of gastrointestinal motility disorders is closely related to the stem cell factor(SCF)/c-kit signaling pathway associated with intestinal flora and Cajal stromal ***,intestinal flora can also affect the regulation of SCF/c-kit signaling pathway,thus affecting the expression of Cajal stromal *** cells are the pacemakers of gastrointestinal *** To investigate the effects of Bifidobacterium lactis(***)BLa80 on the intestinal flora of rats in simulated microgravity and on the gastrointestinal motility-related SCF/c-kit *** The internationally recognized tail suspension animal model was used to simulate the microgravity environment,and 30 rats were randomly divided into control group,tail suspension group and drug administration tail suspension group with 10 rats in each group for a total of 28 *** tail group was given *** BLa80 by intragastric administration,and the other two groups were given water intragastric administration,the concentration of intragastric administration was 0.1 g/mL,and each rat was 1 mL/***&eosin staining was used to observe the histopathological changes in each segment of the intestine of each group,and the expression levels of SCF,c-kit,extracellular signal-regulated kinase(ERK)and p-ERK in the gastric antrum of each group were detected by Western blotting and *** fecal flora and mucosal flora of rats in each group were detected by 16S *** Simulated microgravity resulted in severe exfoliation of villi of duodenum,jejunum and ileum in rats,marked damage,increased space between villi,loose arrangement,shortened columnar epithelium of colon,less folds,narrower mucosal thickness,reduced goblet cell number and crypts,and significant improvement after probiotic *** microgravity reduced the expressions of SCF and c-kit,and increased the express

关键词： Simulated microgravity Rat Intestinal flora Gastrointestinal motility Stem cell factor/c-kit signaling pathway