检索结果-南通市图书馆

Compressed data Separation via ℓ_(q)-Split Analysis with ℓ_(∞)-Constraint

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2024年第7期40卷 1655-1673页

作者： Ming Yang Gu Song Li Jun Hong Lin School of Mathematical Science Zhejiang UniversityHangzhou310027P.R.China center for data Science Zhejiang UniversityHangzhou310027P.R.China

In this paper,we study compressed data separation(CdS)problem,i.e.,sparse data separation from a few linear random *** propose the nonconvex ℓ_(q)-split analysis with ℓ_(∞)-constraint and 0rithm ℓ_(q)-split-analysis dantzig selector(ℓ_(q)-split-analysis dS).We show that the two distinct subcomponents that are approximately sparse in terms of two different dictionaries could be stably approximated via the ℓ_(q)-split-analysis dS,provided that the measurement matrix satisfies either a classical d-rIP(restricted Isometry Property with respect to dictionaries and ℓ_(2) norm)or a relatively new(d,q)-rIP(rIP with respect to dictionaries and ℓ_(q)-quasi norm)condition and the two different dictionaries satisfy a mutual coherence condition between *** the Gaussian random measurements,the measurement number needed for the(d,q)-rIP condition is far less than those needed for the d-rIP condition and the(d,1)-rIP condition when q is small enough.

关键词： data separation ℓ_(q)-split analysis dantzig selector frames restricted isometry property compressed sensing

Anomalies in the short-range local environment and atomic diffusion in single crystalline equiatomic CrMnFeCoNi highentropy alloy

在线全文

学校读者我要写书评

暂无评论

Nano research 2024年第6期17卷 5336-5348页

作者： Alevtina Smekhova daniel Gaertner Alexei Kuzmin Ana Guilherme Buzanich Goetz Schuck Ivo Zizak Gerhard Wilde Kirill V.Yusenko Sergiy divinski Helmholtz-Zentrum Berlin für Materialien und Energie(HZB) D-12489 BerlinGermany Institute of Materials Physics University of MünsterD-48149 MünsterGermany Institute of Solid State Physics University of LatviaLV-1063 RigaLatvia Bundesanstalt für Materialforschung und–prüfung(BAM) D-12489 BerlinGermany

Multi-edge extended X-ray absorption fine structure(EXAFS)spectroscopy combined with reverse Monte Carlo(rMC)simulations was used to probe the details of element-specific local coordinations and component-dependent structure relaxations in single crystalline equiatomic CrMnFeCoNi high-entropy alloy as a function of the annealing *** representative states,namely a high-temperature state,created by annealing at 1373 K,and a low-temperature state,produced by long-term annealing at 993 K,were compared in *** features identified in atomic configurations of particular principal components indicate variations in the local environment distortions connected to different degrees of compositional disorder at the chosen representative *** detected changes provide new atomistic insights and correlate with the existence of kinks previously observed in the Arrhenius dependencies of component diffusion rates in the CrMnFeCoNi high-entropy alloy.

关键词： high-entropy alloys diffusion short-range order extended X-ray absorption fine structure(EXAFS) reverse Monte Carlo

Yields,growth and water use under chemical topping in relations to row configuration and plant density in drip-irrigated cotton

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Cotton research 2024年第2期7卷 123-136页

作者： Wang Xuejiao Hu Yanping Ji Chunrong Chen Yongfan Sun Shuai Zhang Zeshan Zhang Yutong Wang Sen Yang Mingfeng Ji Fen Guo Yanyun Li Jie Zhang Lizhen Xinjiang Agriculture Network Information center Xinjiang Agrometeorological ObservatoryUrumqi 830002China College of resources and Environmental Sciences Xinjiang Agricultural UniversityUrumqi 830091China College of resources and Environmental Sciences China Agricultural UniversityBeijing 100193China China Meteorological Administration Institute of Desert MeteorologyUrumqi 830002China Wulanwusu Agrometeorological Station Shihezi 832199China Xinjiang Academy of Agricultural Sciences China National Cotton R&D CenterUrumqi 830091China

Background Water deficit is an important problem in agricultural production in arid *** the advent of wholly mechanized technology for cotton planting in Xinjiang,it is important to determine which planting mode could achieve high yield,fiber quality and water use efficiency(WUE).This study aimed to explore if chemical topping affected cotton yield,quality and water use in relation to row configuration and plant *** Experiments were carried out in Xinjiang China,in 2020 and 2021 with two topping method,manual topping and chemical topping,two plant densities,low and high,and two row configurations,i.e.,76 cm equal rows and 10+66 cm narrow-wide rows,which were commonly applied in matching harvest *** topping increased seed cotton yield,but did not affect cotton fiber quality comparing to traditional manual *** equal row spacing,the WUE in higher density was 62.4%higher than in the lower ***,under narrow-wide row spacing,the WUE in lower density was 53.3%higher than in higher one(farmers’practice).For machine-harvest cotton in Xinjiang,the optimal row configuration and plant density for chemical topping was narrow-wide rows with 15 plants m-2 or equal rows with 18 plants *** The plant density recommended in narrow-wide rows was less than farmers’practice and the density in equal rows was moderate with local *** results provide new knowledge on optimizing agronomic managements of machine-harvested cotton for both high yield and water efficient.

关键词： Yield components Fiber quality Transpiration Water use efficiency Heat ratio method(HrM)

Biomass valorization via electrocatalytic carbon–carbon bond cleavage

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第4期91卷 542-578页

作者： Keping Wang Zhenyan Guo Min Zhou Ying Yang Lanyun Li Hu Li rafael Luque Shunmugavel Saravanamurugan National Key Laboratory of Green Pesticide Key Laboratory of Green Pesticide&Agricultural BioengineeringMinistry of EducationState-Local Joint Laboratory for Comprehensive Utilization of BiomassCenter for R&D of Fine ChemicalsGuizhou UniversityGuiyang 550025GuizhouChina departamento de Quimica Organica Universidad de CordobaCampus de RabanalesEdificio Marie Curie(C-3)Ctra Nnal IVKm.396E-14014 CordobaSpain Laboratory of Bioproduct Chemistry Centre of Innovative and Applied Bioprocessing(CIAB)Mohali 140306PunjabIndia

renewable electrocatalytic upgrading of biomass feedstocks into valuable chemicals is one of the promising strategies to relieve the pressure of traditional energy-based *** electrocatalytic carbon–carbon bond cleavage of high selectivity,various functionalized molecules,such as organic acids,amides,esters,and nitriles,have great potential to be accessed from ***,it has merely received finite concerns and interests in the *** review first showcases the research progress on the electrocatalytic conversion of lipid/sugar-and lignin-derived molecules(e.g.,glycerol,mesoerythritol,xylose,glucose,1-phenylethanol,and cyclohexanol)into organic acids via specific carbon–carbon bond scission processes,with focus on disclosing reaction mechanisms,recognizing actual active species,and collecting feasible modification *** the guidance of further extensive studies on biomass valorization,organic transformations via a variety of reactions,including decarboxylation,ring-opening,rearrangement,reductive hydrogenation,and carboxylation,are also disclosed for the construction of similar carbon skeletons/*** remaining challenges,prospective applications,and future objectives in terms of biomass conversion are also *** review is expected to provide references to develop renewed electrocatalytic carbon–carbon bond cleavage transformation paths/strategies for biomass upgrading.

关键词： Electrocatalysis Biomass conversion Carbon-carbon bond cleavage Organic acids

dendrobium officinale polysaccharide attenuates type 2 diabetes in mice model by modulating gut microbiota and alleviating intestinal mucosal barrier damage

在线全文

学校读者我要写书评

暂无评论

Food Science and Human Wellness 2024年

作者： Xiaoxia Chen Chun Chen Changyang Ma Wenyi Kang Junlin Wu Xiong Fu Guangzhou Wondfo Health Science and Technology Co. Ltd. National r&d center for Edible Fungus Processing Technology Henan University Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety Guangzhou Institute of Modern Industrial Technology 4. Overseas Expertise Introduction center for discipline Innovation of Food Nutrition and Human Health (111 center) SCUT-Zhuhai Institute of Modern Industrial Innovation School of Food Science and Engineering South China University of Technology

The purpose of this study was to investigate the hypoglycemic effect and mechanism of dendrobium officinale polysaccharide (dOP) on type 2 diabetes mellitus (T2dM) mice established by high-fat diet and streptozotocin. The results showed that dOP improved glycolipid metabolism and serum inflammation levels， and inhibited intestinal-derived lipopolysaccharide (LPS) translocation， suggesting that inhibiting LPS-mediated intestinal barrier damage may be a key target for dOP to alleviate T2dM. Interestingly， the study found that dOP reduced intestinal inflammation and oxidative stress levels， significantly up-regulated the mrNA expression of tight junction proteins Claudin-1， Occludin and Zonula occluden-1 (ZO-1)， and ameliorated intestinal epithelial damage. In addition， dOP strongly inhibited the intestinal pathogenic bacteria and LPS-producing bacteria Helicobacter， Enterococcus and desulfovibrio with a reduction rate of 95%， 73% and 9%， respectively， and promoted the proliferation of anti-inflammatory bacteria Bifidobacterium and Lactobacillus by 139% and 8%， respectively. Taken together， the hypoglycemic effect of dOP was related to the protection of intestinal mucosal barrier， and its underlying mechanism lied in its excellent anti-inflammatory and gut microbiota-modulatory effects， providing a theoretical basis for developing dOP as a novel prebiotic in functional food for diabetes.

关键词：

Surface Ligand Evolution:Sulfur-directed Covalent Bonding of PPh_(3) on Pd_(4)S with Improved Semi-hydrogenation of Terminal Alkynes

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Precision Chemistry 2024年第5期2卷 200-207页

作者： Wentong Jing Shiguang Mo Weiie Zhang Wenting Zhou Kunlong Liu Jie Wei ruixuan Qin Nanfeng Zheng New Cornerstone Science Laboratory State Key Laboratory for Physical Chemistry of Solid SurfacesCollaborative Innovation Center of Chemistry for Energy Materialsand National&Local Joint Engineering Research Center of Preparation Technology of NanomaterialsCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China China resources Cement Technology r&d(Guangxi)Co Ltd. Nanning 530008China Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) Xiamen 361102China

Surface modification of metallic nanocatalysts with organic ligands has emerged as an effective strategy to enhance catalytic selectivity,although offten at the expense of catalytic *** this study,we demonstrate a compelling approach by surface modifying Pd2S nanocrystals with PPhz ligands,resulting in a catalyst with excellent catalytic activity and durable selectivity for the semi-hydrogenation of terminal *** and theoretical investigations reveal that the presence of S sites on the Pd surface directs PPh_(3) ligands to preferentially form covalent bonds with S,creating distinctive surface S=PPh_(3) *** configuration induces a partial positive charge on Pd,facilitating hydrogen transfer and thus promoting catalytic ***,the covalent bond between the ligand and catalyst surface forms a robust network,ensuring ligand stability and increasing the hydrogenation energy barrier of ***,the Pd_(4)S@PPhz catalyst exhibits an improved catalytic selectivity with durability in terminal alkyne *** study introduces an effective strategy for designing selective hydrogenation catalysts with an enhanced performance.

关键词： Pd nanocatalysts surface modification selective hydrogenation catalytic stability alkyne semi-hydrogenation

原子级单位点金属(氢)氧化物催化剂设计中的异价离子互斥原则（英文）

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science Bulletin 2024年第13期 2009-2012页

作者：周道金王枫梅邝允孙晓明 State Key Laboratory of Chemical resource Engineering Beijing University of Chemical Technology Ocean Hydrogen Energy r&d center Research Institute of Tsinghua University in Shenzhen

Single-atom catalysts (SACs) are a series of catalysts in which all metal species are atomically dispersed on oxides, zeolites, sulfides,carbons, and so on. The concept describing how atoms arrange with their nearest neighbors was proposed in 1969 by Van Hardeveld and co-workers [1], and researchers witness the growing popularity of SACs [2]. However, the first long-standing issue in SACs is that the low concentration of active sites on the supports. Furthermore, weak chemical bonds between active sites with supports cannot sustain the functionalities of the SACs during long-term reactions, especially ones run at harsh conditions (high temperature or humidity, strong oxidative conditions). The loss or aggregation of active sites in SACs require substantial efforts to address the existing drawbacks in traditional SACs.

关键词：

Multifunctional MXene/Carbon Nanotube Janus Film for Electromagnetic Shielding and Infrared Shielding/detection in Harsh Environments

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Nano-Micro Letters 2024年第10期16卷 543-560页

作者： Tufail Hassan Aamir Iqbal Byungkwon Yoo Jun Young Jo Nilufer Cakmakci Shabbir Madad Naqvi Hyerim Kim Sungmin Jung Noushad Hussain Ujala Zafar Soo Yeong Cho Seunghwan Jeong Jaewoo Kim Jung Min Oh Sangwoon Park Youngjin Jeong Chong Min Koo School of Advanced Materials Science and Engineering Sungkyunkwan UniversitySeobu-ro 2066Jangan-guSuwon-siGyeonggi-do 16419Republic of Korea department of Materials Science and Engineering Soongsil UniversitySeoul 06978Republic of Korea Institute of Advanced Composite Materials Korea Institute of Science and Technology92 Chudong-roBongdong-eupWanju-gunJeollabuk-do 55324Republic of Korea r&d center INNOMXENE Co. Ltd.Daejeon 34365Republic of Korea School of Chemical Engineering Sungkyunkwan UniversitySeobu-ro 2066Jangan-guSuwon-siGyeonggi-do 16419Republic of Korea

Multifunctional,flexible,and robust thin films capable of operating in demanding harsh temperature environments are crucial for various cutting-edge *** study presents a multifunctional Janus film integrating highly-crystalline Ti_(3)C_(2)T_(x) MXene and mechanically-robust carbon nanotube(CNT)film through strong hydrogen *** hybrid film not only exhibits high electrical conductivity(4250 S cm^(-1)),but also demonstrates robust mechanical strength and durability in both extremely low and high temperature environments,showing exceptional resistance to thermal *** hybrid Janus film of 15μm thickness reveals remarkable multifunctionality,including efficient electromagnetic shielding effectiveness of 72 dB in X band frequency range,excellent infrared(Ir)shielding capability with an average emissivity of 0.09(a minimal value of 0.02),superior thermal camouflage performance over a wide temperature range(−1 to 300°C)achieving a notable reduction in the radiated temperature by 243°C against a background temperature of 300°C,and outstanding Ir detection capability characterized by a 44%increase in resistance when exposed to 250 W Ir *** multifunctional MXene/CNT Janus film offers a feasible solution for electromagnetic shielding and Ir shielding/detection under challenging conditions.

关键词： MXene/carbon nanotube Janus film Electromagnetic interference shielding Infrared shielding Thermal camouflage Infrared detection

Effect of purine diet on prognosis of deep brain stimulation for Parkinson's disease

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Food Science and Human Wellness 2024年

作者： Bowen Chang Yuge Jiang Chuanxing Feng Bowen Li Jiaming Mei Chaoshi Niu Key Laboratory of Xin'an Medicine Ministry of Education Anhui Province Key Laboratory of r&d of Chinese Medicine Anhui University of Chinese Medicine 3. center for Food Nutrition and Functional Food Engineering School of Food Science and Technology Jiangnan University department of Neurosurgery The First Affiliated Hospital of USTC division of Life Sciences and Medicine University of Science and Technology of China

Uric acid (UA) is a naturally antioxidant that is strongly associated with the development and progression of Parkinson’s disease (Pd). The purine diet is an important exogenous pathway that modulates blood UA levels. deep brain stimulation (dBS) is an important tool for Pd treatment. This study aimed to explore the effects of preoperative purine diet on the prognosis of patients with Pd after dBS. 64 patients with Pd who underwent dBS were included in this study， and their clinical data， blood UA values， and daily purine intake. Patients were followed up for improvement 1 year after surgery. We found that patient higher purine intake was strongly associated with the rate of improvement after dBS and was a protective factor for patient prognosis. daily purine intake from meat and seafood was significantly higher in the responsive patients than in the less-responsive patients. Mediation analysis showed that UA mediated 78% of the effect of purine intake on motor symptom improvement after dBS. In summary， we observed that purine intake is strongly associated with the rate of improvement in motor symptoms after STN-dBS in patients with Pd. This study provides a reference for preoperative diet planning in patients with Parkinson’s disease undergoing dBS.

关键词：