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Temperature trends and its elevation-dependent warming over the Qilian Mountains

Journal of Mountain Science 2024年第2期21卷 500-510页

作者： ZHAO Peng HE Zhibin MA Dengke WANG Wen qian Lihui School of computer Science Huainan Normal UniversityHuainan 232038China Linze Inland River Basin Research Station Key Laboratory of Inland River Basin ScienceNorthwest Institute of Eco-Environment and ResourceChinese Academy of SciencesLanzhou 730000China University of chinese Academy of Sciences Beijing 100049China

Understanding temperature variability especially elevation dependent warming(EDW)in high-elevation mountain regions is critical for assessing the impacts of climate change on water resources including glacier melt,degradation of soils,and active layer *** means that temperature is warming faster with the increase of *** this study,we used observed temperature data during 1979-2017 from 23 meteorological stations in the Qilian Mountains(QLM)to analyze temperature trend with Mann-Kendall(MK)test and Sen’s slope *** showed that the warming trends for the annual temperature followed the order of T_min>T_mean>T_max and with a shift both occurred in *** and summer temperature have a higher increasing trend than that in autumn and winter.T_mean shifts occurred in 1996 for spring and summer,in 1997 for autumn and winter.T_max shifts occurred in 1997 for spring and 1996 for summer.T_min shifts occurred in 1997 for spring,summer and winter as well as in 1999 for *** mean diurnal temperature range(DTR)shows a significant decreasing trend(-0.18°c/10a)from 1979 to *** mean DTR shows a significant decreasing trend(-0.26°c/10a)from 1979 to 2017 with a shift occurred in *** removing longitude and latitude factors,we can learn that the warming enhancement rate of average annual temperature is 0.0673°c/km/10a,indicating that the temperature warming trend is accelerating with the continuous increase of *** increase rate of elevation temperature is 0.0371°c/km/10a in spring,0.0457°c/km/10a in summer,0.0707°c/km/10a in autumn,and 0.0606°c/km/10a in winter,which indicates that there is a clear EDW in the *** main causes of warming in the Qilian Mountains are human activities,cloudiness,ice-snow feedback and El Nino phenomenon.

关键词： climate change Qilian Mountains Warming rates DTR Elevation-dependent warming

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The Adjustment Analysis Method of the Active Surface Antenna Based on convolutional Neural Network

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Research in Astronomy and Astrophysics 2024年第6期24卷 294-306页

作者： You Ban Shang Shi Na Wang qian Xu Shufei Feng School of Mechanical engineering Xinjiang UniversityUrumqi 830017China Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China School of Mechanical engineering Dongguan University of TechnologyDongguan 523808China

Active surface technique is one of the key technologies to ensure the reflector accuracy of the millimeter/submillimeter wave large reflector *** antenna is complex,large-scale,and high-precision equipment,and its active surfaces are affected by various factors that are difficult to comprehensively deal *** this paper,based on the advantage of the deep learning method that can be improved through data learning,we propose the active adjustment value analysis method of large reflector antenna based on deep *** method constructs a neural network model for antenna active adjustment analysis in view of the fact that a large reflector antenna consists of multiple panels spliced *** on the constraint that a single actuator has to support multiple panels(usually 4),an autonomously learned neural network emphasis layer module is designed to enhance the adaptability of the active adjustment neural network *** classical 8-meter antenna is used as a case study,the actuators have a mean adjustment error of 0.00252 mm,and the corresponding antenna surface error is0.00523 *** active adjustment result shows the effectiveness of the method in this paper.

关键词： techniques:radar astronomy telescopes methods:analytical methods:numerical

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Hyperglycemia activates FGFR1 via TLR4/c-Src pathway to induce inflammatory cardiomyopathy in diabetes

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Acta Pharmaceutica Sinica B 2024年第4期14卷 1693-1710页

作者： Xiong chen Jinfu qian Shiqi Liang Jianchang qian Wu Luo Yujuan Shi Hong Zhu Xiang Hu Gaojun Wu Xiaokun Li Guang Liang Department of Endocrinology the First Affiliated HospitalWenzhou Medical UniversityWenzhou 325035China chemical Biology Research center School of Pharmaceutical SciencesWenzhou Medical UniversityWenzhou 325035China Department of Wound Repair the First Affiliated HospitalWenzhou Medical UniversityWenzhou 325035China Department of cardiology the First Affiliated HospitalWenzhou Medical UniversityWenzhou 325035China School of Pharmaceutical Sciences Hangzhou Medical CollegeHangzhou 311399China

Protein tyrosine kinases (RTKs) modulate a wide range of pathophysiological events in several non-malignant disorders, including diabetic complications. To find new targets driving the development of diabetic cardiomyopathy (DcM), we profiled an RTKs phosphorylation array in diabetic mouse hearts and identified increased phosphorylated fibroblast growth factor receptor 1 (p-FGFR1) levels in cardiomyocytes, indicating that FGFR1 may contribute to the pathogenesis of DcM. Using primary cardiomyocytes and H9c2 cell lines, we discovered that high-concentration glucose (HG) transactivates FGFR1 kinase domain through toll-like receptor 4 (TLR4) and c-Src, independent of FGF ligands. Knocking down the levels of either TLR4 or c-Src prevents HG-activated FGFR1 in cardiomyocytes. RNA-sequencing analysis indicates that the elevated FGFR1 activity induces pro-inflammatory responses via MAPKs–NFκB signaling pathway in HG-challenged cardiomyocytes, which further results in fibrosis and hypertrophy. We then generated cardiomyocyte-specific FGFR1 knockout mice and showed that a lack of FGFR1 in cardiomyocytes prevents diabetes-induced cardiac inflammation and preserves cardiac function in mice. Pharmacological inhibition of FGFR1 by a selective inhibitor, AZD4547, also prevents cardiac inflammation, fibrosis, and dysfunction in both type 1 and type 2 diabetic mice. These studies have identified FGFR1 as a new player in driving DcM and support further testing of FGFR1 inhibitors for possible cardioprotective benefits.

关键词： Diabetic cardiomyopathy Protein tyrosine kinases FGFR1 cardiomyocytes Inflammatory responses Toll-like receptor4 c-Src NFkB

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Impacts of Water-Sediment Regulation Scheme on chromophoric Dissolved Organic Matter in the Lower Yellow River

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Journal of Ocean University of china 2024年第2期23卷 455-466页

作者： LIU Xiao JIANG Xueyan LIU qian SUI Juanjuan ZOU Li Key Laboratory of Marine chemistry Theory and Technology of Ministry of Education Ocean University of ChinaQingdao 266100China college of chemistry and chemical engineering Ocean University of ChinaQingdao 266100China School of Earth Sciences University of BristolBristolBS81RJUK North china Sea Environmental Monitoring center State Oceanic AdministrationQingdao 266033China Key Laboratory of Ecological Prewarning Protection and Restoration of Bohai SeaMinistry of Natural ResourcesQingdao 266033China Key Laboratory of Marine Environment and Ecology of Ministry of Education Ocean University of ChinaQingdao 266100China college of Environmental Science and engineering Ocean University of ChinaQingdao 266100China

As a river with more than 3000 reservoirs in its watershed,the Yellow River has been affected by dams not only on the sediment load,but also on the water ***-sediment regulation scheme(WSRS),which has been carried out annually in the Yellow River since 2002,is a typical human activity affecting river water *** dissolved organic matter(cDOM)in river is susceptible to changes in ecological and environmental conditions as well as human ***,we report variations in dissolved organic carbon concentrations,compositions and sources of cDOM in time series samples in the lower Yellow River during *** addition,a parallel factor fluorescence analysis(PARAFAc)method is applied to identify different fluorescent components in water samples during WRSR,showing four major components including tryptophan-like component(c1),microbial humic-like component(c2),terrestrial humic-like component(c3)and tyrosine-like component(c4).In general,c1 increased after water regulation,while c2 and c3 increased after sediment regulation,indicating that the water and sediment released by the dam have different effects on cDOM *** the impacts of the dam,source of cDOM in the lower Yellow River is mainly autochthonous related to microbial activities,and is regulated by the terrestrial input during WSRS *** resuspension inhibits microbial activities and reduces the production of autochthonous ***,human activities especially WSRS,as exemplified here,significantly alter the quality and quantity of cDOM in the lower Yellow River,affecting cDOM dynamics and biogeochemical processes in the estuarine environment.

关键词： chromophoric dissolved organic matter(cDOM) water-sediment regulation scheme(WSRS) Yellow River optical properties

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Description of martensitic transformation kinetics in Fe-c-X(X = Ni,cr,Mn,Si) system by a modified model

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International Journal of Minerals,Metallurgy and Materials 2024年第5期31卷 1026-1036页

作者： Xiyuan Geng Hongcan chen Jingjing Wang Yu Zhang Qun Luo qian Li State Key Laboratory of Advanced Special Steels&Shanghai Key Laboratory of Advanced Ferrometallurgy&School of Materials Science and engineering Shanghai UniversityShanghai 200444China Ansteel Beijing Research Institute co. LtdBeijing 102211China National engineering Research center for Magnesium Alloys Chongqing UniversityChongqing 400044China college of Materials Science and engineering Chongqing UniversityChongqing 400044China National Key Laboratory of Advanced casting Technologies Chongqing UniversityChongqing 400044China

controlling the content of athermal martensite and retained austenite is important to improving the mechanical properties of high-strength steels,but a mechanism for the accurate description of martensitic transformation during the cooling process must be *** present,frequently used semi-empirical kinetics models suffer from huge errors at the beginning of transformation,and most of them fail to exhibit the sigmoidal shape characteristic of transformation *** describe the martensitic transformation process accurately,based on the Magee model,we introduced the changes in the nucleation activation energy of martensite with temperature,which led to the varying nucleation rates of this model during martensitic *** to the calculation results,the relative error of the modified model for the martensitic transformation kinetics curves of Fe-c-X(X = Ni,cr,Mn,Si) alloys reached 9.5% compared with those measured via the thermal expansion *** relative error was approximately reduced by two-thirds compared with that of the Magee *** incorporation of nucleation activation energy into the kinetics model contributes to the improvement of its precision.

关键词： Fe-c-X system martensitic transformation kinetics curve semi-empirical model nucleation activation energy

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Rhodium-catalyzed Doyle-Kirmse rearrangement reactions of sulfoxoniun ylides

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chinese chemical Letters 2024年第4期35卷 363-366页

作者： Ying-Di Hao Zhi-qian Lin Xiao-Yu Guo Jiao Liang can-Kun Luo qian-Tao Wang Li Guo Yong Wu Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Department of Medicinal chemistry Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial TechnologyWest China School of PharmacySichuan UniversityChengdu 610041China

Doyle-Kirmse rearrangement reactions have received continuous attention as an important method for constructing complex chemical structures. Herein, we disclosed an efficient rhodium-catalyzed DoyleKirmse rearrangement reaction, which can simultaneously construct c–c bonds and c–X(X = S/Se) bonds using sulfoxonium ylides as starting materials to obtain sulfur-or selenium-containing compounds. This strategy is characterized by the safer and greener carbene precursor, high yields and broad substrate scope, possessing a wide range of application.

关键词： Sulfoxonium ylides Rhodium(Ⅱ)-catalyzed carbene Rearrangement reactions One-pot process

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Phosphorylated cellulose nanofibers establishing reliable ion-sieving barriers for durable lithium-sulfur batteries

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Journal of Energy chemistry 2024年第5期92卷 619-628页

作者： Zihao Li Pengsen qian Hongyang Li He Xiao Jun chen Gaoran Li School of Materials Science and engineering Nanjing University of Science and TechnologyNanjing 210094JiangsuChina National Forestry and Grassland Administration Key Laboratory of Plant Fiber Functional Materials Fuzhou 350108FujianChina

The shuttle effect is among the most characteristic and formidable challenges in the pursuit of high-performance lithium-sulfur(Li-S)***,phosphorylated cellulose nanofibers(pcNF)are intentionally engineered to establish an ion-sieving barrier against polysulfide shuttling and thereby improve battery *** phosphorylation,involving the grafting of phosphate groups onto the cellulose backbone,imparts an exceptional electronegativity that repels the polysulfide anions from penetrating through the ***,the electrolyte wettability and Li^(+)transfer can be significantly promoted by the polar nature of pcNF and the facile Li^(+)*** such,rational ion management is realized,contributing to enhanced reversibility in both sulfur and lithium *** a result,Li-S cells equipped with the self-standing pcNF separator demonstrate outstanding long-term cyclability with a minimum fading rate of 0.013%per cycle over 1000 cycles at 1 c,and a decent areal capacity of 5.37 mA h cm^(-2) even under elevated sulfur loading of 5.0 mg cm^(-2) and limited electrolyte of 6.0 mL g^(-1).This work provides a facile and effective pathway toward the well-tamed shuttle effect and highly durable Li-S batteries.

关键词： Lithium-sulfur batteries cellulose Phosphorylation Ion-sieving Shuttle effect

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Synchronous deprotonation–protonation for mechanically robust chitin/aramid nanofibers conductive aerogel with excellent pressure sensing, thermal management, and electromagnetic interference shielding

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Nano Research 2024年第3期17卷 2038-2049页

作者： Xinxin Zhang Kunpeng qian Jianhui Fang Sineenat Thaiboonrod Miao Miao Xin Feng Department of chemistry College of SciencesShanghai UniversityShanghai 200444China Research center of Nano Science and Technology College of SciencesShanghai UniversityShanghai 200444China School of Materials Sciences and engineering Shanghai UniversityShanghai 200444China National Nanotechnology center(NANOTEc) National Science and Technology Development Agency(NSTDA)Thailand Science ParkPathum Thani 12120Thailand

Aerogels with regularly porous structure and uniformly distributed conductive networks have received extensive attention in wearable electronic sensors,electromagnetic shielding,and so ***,the poor mechanical properties of the emerging nanofibers-based aerogels are limited in practical *** this work,we developed a synchronous deprotonation–protonation method in the KOH/dimethyl sulfoxide(DMSO)system at room temperature for achieving chitin cross-linked aramid nanofibers(cANFs)rather than chitin nanofibers(chNFs)and aramid nanofibers(ANFs)separately by using chitin and aramid pulp as raw *** freeze-drying process,the cross-linked chitin/aramid nanofibers(cA)aerogel exhibited the synergetic properties of chNF and ANF by the dual-nanofiber compensation *** mechanical stress of cA aerogel was 170 kPa at 80%compressive strain,increased by 750%compared with pure chNF ***,the compressibility of cA aerogel was somewhat improved compared to ANF *** enhancement verified that the crosslinking reaction between ANF and chNF during the synchronous deprotonation process was ***,the conductive aerogels with uniform porous structure(cA-M)were successfully obtained by vacuum impregnating cA aerogels in Ti_(3)c_(2)T_(x) MXene solution,displaying low thermal conductivity(0.01 W/(m·K)),high electromagnetic interference(EMI)shielding effectiveness(SE)(75 dB),flame retardant,and heat ***,the as-obtained cA-M aerogels were also applied as a pressure sensor with excellent compression cycle stability and superior human motion monitoring *** a result,the dual-nanofiber based conductive aerogels have great potentials in flexible/wearable electronics,EMI shielding,flame retardant,and heat insulation.

关键词： synchronous deprotonation–protonation electromagnetic interference(EMI)shielding flame retardant heat insulation pressure sensing

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carotenoid isomerase regulates rice tillering and grain productivity by its biosynthesis pathway

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Journal of Integrative Plant Biology 2024年第2期66卷 172-175页

作者： chaoqing Ding Zhengji Shao Yuping Yan Guangheng Zhang Dali Zeng Li Zhu Jiang Hu Zhenyu Gao Guojun Dong qian qian Deyong Ren State Key Laboratory of Rice Biology and Breeding ChinaNational Rice Research InstituteHangzhou 310006China

Tillers are unique inflorescence-like branches in grasses,and their number determines the panicle number,plant architecture,and yield(Shang et al.,2021).Tiller formation mainly undergoes axillary meristem(AM)initiation and tiller bud outgrowth(Wang et al.,2018;Yan et al.,2023).The rice(Oryza sativa)KNOX gene OSH1 is expressed in AMs,and an osh1 mutant produces fewer tillers(Tanaka et al.,2015).

关键词： sativa Oryza panicle

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Metal-organic framework hybrid materials of ZIF-8/RGO for immobilization of D-amino acid dehydrogenase

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Nano Research 2024年第1期17卷 290-296页

作者： Hangbin Lei qian Zhang Xiaoyan Xiang Liang Jiang Shiyan Wang Lingxuan Duan Shizhen Wang Department of chemical and Biochemical engineering College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Xiamen Key Laboratory of Synthetic Biotechnology Xiamen UniversityXiamen 361005China

Immobilization of D-amino acid dehydrogenase(DAADH)by the assembly of peptide linker was studied for the biosynthesis of *** material of zeolitic imidazolate framework-8(ZIF-8)combined with reduced graphene oxide(RGO)was applied for the immobilization of DAADH from Ureibacillus *** recovery rate of DAADH/ZIF-8/RGO was 165.6%.DAADH/ZIF-8/RGO remained 53.4%of its initial activity at 50°c for 10 h while the free enzyme was ***/ZIF-8/RGO maintained 70.5%activity in hyperalkaline solution with pH *** parameters indicated that DAADH/ZIF-8/RGO had greater affinity of phenylpyruvate as V_(max)/K_(m)of DAADH/ZIF-8/RGO was 1.27-fold than free *** seven recycles,the activity of DAADH/ZIF-8/RGO remained 64.3%.Furthermore,one-step separation and in situ immobilization of DAADH by ZIF-8/RGO/Ni was carried out with 1.5-fold activity *** peptide linker and metal-organic framework(MOF)immobilization,thermostability and activity of the immobilized DAADH were significantly improved.

关键词： D-Amino acid dehydrogenase immobilization metal-organic frameworks zeolitic imidazolate framework-8(ZIF-8) reduced graphene oxide

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