检索结果-南通市图书馆

Anchoring metal ions in amine-functionalized boron imidazolate framework for photocatalytic reduction of CO_(2)

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2022年第6期33卷 2915-2918页

作者： Guilan Xu Qin-Long Hong Yayong Sun Meng Liu hai-xia zhang Jian zhang State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Key Lab for Sport Shoes Upper Materials of Fujian Province Fujian Huafeng New Material Co.Ltd.Putian 351164China

The photocatalytic reduction of CO_(2)to energy-rich chemicals is highly appealing for alleviation of energy crisis and environment *** introduction of different active sites is a key factor to determine the reaction activity and ***,we demonstrate the metal ion-dependent performance for photocatalytic CO_(2)reduction by anchoring transition metal ions(Co^(2+)and Ni^(2+))in an amine-functionalized boron imidazolate framework(BIF-43).As a result,Ni@BIF-43 realized a high selectivity of 90.2%for the CO_(2)-to-CO,while Co@BIF-43 achieved more efficient conversion with a high CO production rate of 2036.0μmol g^(-1)h^(-1).Significantly,precise control of isolated metal site on a well-defined structure through coordination-assisted strategies enables us to better understand the specific effects of different metal-ion species on photoreduction of CO_(2)as well as the catalytic mechanism.

关键词： Metal-organic framework CO_(2)reduction Boron-imidazolate framework Photocatalysis Structure

Effects of a novel refiner Al-3Ti-4.35La combined with Sr on microstructure and mechanical properties of as-cast A356 alloy

在线全文

学校读者我要写书评

暂无评论

China Foundry 2024年第6期21卷 641-650页

作者： Mei Xu Wan-wu Ding Li-wen Hu Shi-hao Chen hai-xia zhang hai-cun Yu Wen-jun Zhao School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou 730050China

It is a practically significant issue to refine and modify industrial Al-Si casting alloy to improve its *** the present study,a novel refiner Al-3Ti-4.35La alloy,prepared by a melt-reaction method,was used,combined with Sr to refine the as-cast A356 *** effects on the as-cast microstructures and mechanical properties of A356 alloy were *** results indicate that the combined addition of Al-3Ti-4.35La intermediate alloy and Sr can improve the microstructure and enhance the mechanical properties of A356 *** adding 0.3wt.%Al-3Ti-4.35La and 0.03wt.%Sr to the as-cast A356 alloy,the average grain size ofα-Al decreases from 693.47μm to 264.13μm(a decrease of 61.91%),the secondary dendrite arm spacing(SDAS)is decreased by 47.8%from 32.09μm to 16.75μm,and the eutectic Si is transformed from an acicular structure to short rods and a granular *** ultimate tensile strength(UTS)and elongation(EL)of the as-cast A356 alloy modified by Al-3Ti-4.35La and Sr reach 216.3 MPa and 10.6%,which are enhanced by 29.54%and 134.66%compared with the unmodified alloy,*** fracture mode is transformed from transgranular fracture to intergranular fracture,and the ductile toughness of the alloy is *** adding the Al-3Ti-4.35La and Sr,the undercooling for the nucleation ofα-Al and eutectic Si increases,leading to an accelerated nucleation rate and an increased number of nuclei,which shortens the duration of the eutectic reaction and consequently inhibits grain growth.

关键词： A356 alloy Al-3Ti-4.35La Sr refiner grain refinement microstructure mechanical properties

Recent advances of ferro-/piezoelectric polarization effect for dendrite-free metal anodes

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2023年第8期42卷 2516-2544页

作者： hai-xia zhang Peng-Fei Wang Chuan-Gang Yao Shi-Peng Chen Ke-Di Cai Fa-Nian Shi School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China School of Environmental and Chemical Engineering Shenyang University of TechnologyShenyang 110870China College of Chemistry and Materials Engineering Bohai UniversityJinzhou 121013China

Metal anodes based on plating/stripping electrochemistry,for instance,common alkaline metal lithium(Li),sodium(Na),potassium(K),polyvalent metal magnesium(Mg),aluminum(Al),calcium(Ca)and zinc(Zn)are imminently evoked and increasingly researched for future generation high-energy-density rechargeable batteries due to their large theoretical capacity,low electrochemical potential,and superior electronic conductivity in recent ***,the uncontrolled dendrite formation issue induces low Coulombic efficiency,short lifespan,and hazardous security risks,hindering the actual applications of metal *** various solutions,the utilization of ferro-/piezoelectric materials for metal anodes displays active effects on decreasing local current density,suppressing dendrite growth,and tolerating volume expansion benefits from the unique ferro-/piezoelectric polarization *** review presents the research progress of ferro-/piezoelectric polarization effect for regulating the dendritic growth of metal anodes for the first ***,the current challenges and strategies of metal anodes are ***,ferro-/piezoelectric materials and their working principle are ***,the recent research progress of ferroelectric and piezoelectric materials on dynamic regulation of dendrite growth is summarized,and the future perspectives are *** hope this review could draw more attention in designing metal anodes with self-polarization materials and promoting their practical applications.

关键词： Metal anode Ferro-/piezoelectric material Polarization effect Dendrite-free Lithium Perovskite

Recent progress in silk fibroin-based flexible electronics

在线全文

学校读者我要写书评

暂无评论

Microsystems & Nanoengineering 2021年第3期7卷 1-25页

作者： Dan-Liang Wen De-Heng Sun Peng Huang Wen Huang Meng Su Ya Wang Meng-Di Han Beomjoon Kim Juergen Brugger hai-xia zhang xiao-Sheng zhang School of Electronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu 611731China CIRMM Institute of Industrial ScienceThe University of TokyoTokyo 153-8505Japan Microsystems Laboratory Ecole Polytechnique Federale de Lausanne(EPFL)1015 LausanneSwitzerland Institute of Microelectronics Peking University100087 BeijingChina

With the rapid development of the Internet of Things(loT)and the emergence of 5G,traditional silicon-based electronics no Ion ger fully meet market dema nds such as nonplanar application scenarios due to mechanical *** provides unprecedented opportunities for flexible electronics that bypass the physical rigidity through the introduction of flexible *** recent decades,biological materials with outstanding biocompatibility and biodegradability,which are considered some of the most promising candidates for next-generation flexible electronics,have received increasing attention,e.g.,silk fibroin,cellulose,pectin,chitosan,and *** them,silk fibroin presents greater superiorities in biocompatibility and biodegradability,and moreover,it also possesses a variety of attractive properties,such as adjustable water solubility,remarkable optical transmittance,high mechanical robustness,light weight,and ease of processing,which are partially or even completely lacking in other biological ***,silk fibroin has been widely used as fundamental components for the construction of biocompatible flexible electronics,particularly for wearable and implantable ***,in recent years,more attention has been paid to the investigation of the functional characteristics of silk fibroin;such as the dielectric properties,piezoelectric properties,strong ability to lose electrons,and sensitivity to environmental ***,this paper not only reviews the preparation technologies for various forms of silk fibroin and the recent progress in the use of silk fibroin as a fundamental material but also focuses on the recent advaneed works in which silk fibroin serves as functional *** on ally,the challenges and future development of silk fibroin-based flexible electronics are summarized.

关键词： fibroin silk attractive

Assay of mitochondrial functions by resazurin in vitro

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Pharmacologica Sinica 2004年第3期25卷 131-135页

作者： hai-xia zhang,Guan-hua DU2,Jun-tian zhang Institute of Materia Medica,Peking Union Medical College & Chinese Academy of Medical Sciences,Beijing100050,China Institute of Materia Medica Peking Union Medical College & Chinese Academy of Medical SciencesBeijing 100050 China

AIM: To study the mechanism of resazurin as indicator of mitochondrial function and to develop a rapid and sensitive assay for measuring metabolic activity of isolated mitochondria from rat liver in vitro. METHODS: The screening was carried out on 96-well microtitre plates by monitoring fluorescence intensity of resazurin reduced by mitochondria. Experimental conditions were optimized and influences of several inhibitors on mitochondrial func- tion were observed. RESULTS: Fluorescence intensity increased in a linear manner when the mitochondrial protein concentration from 5 to 50 μg protein per well was incubated with resazurin (5 μmol/L) during 230 min period at 37 oC. Edetic acid could promote the reduction of resazurin in mitochondria. The fluorescence intensity decreased greatly after pretreatment with NaN3, antimycin A, carbonyl cyanide p-trifluoromethoxyphenylhydrazone (FCCP), and oligomycin compared with the control. However, the typical complex I inhibitor, rotenone enhanced the fluorescence intensity without mitochondria. CONCLUSION: Using resazurin to determine mitochondrial func- tion is sensitive, inexpensive and could be easily automated for high throughput screening.

关键词： resazurin drug screening mitochondria

Freeze-dried Si-Ni-San powder can ameliorate high fat diet-induced non-alcoholic fatty liver disease

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2019年第24期25卷 3056-3068页

作者： Feng Zhu Yong-Min Li Ting-Ting Feng Yue Wu hai-xia zhang Guo-Yin Jin Jian-Ping Liu Department of Traditional Chinese Medicine Hebei North UniversityZhangjiakou 075000Hebei ProvinceChina Department of Gastroenterology People’s Hospital of Changshou DistrictChongqing 401220China

BACKGROUND Non-alcoholic fatty liver disease(NAFLD)is a common chronic liver disease ***,to date,there is no ideal therapy for this *** To study the effects of Si-Ni-San freeze-dried powder on high fat diet-induced NAFLD in *** Twenty-four male C57BL/6 mice were randomized into three groups of *** control group(CON)was allowed ad libitum access to a normal chow *** high fat diet group(FAT)and Si-Ni-San group(SNS)were allowed ad libitum access to a high fat *** SNS group was intragastrically administered Si-Ni-San freeze-dried powder(5.0 g/kg)once daily,and the CON and FAT groups were intragastrically administered distilled *** 12 wk,body weight,liver index,visceral fat index,serum alanine aminotransferase(ALT),portal lipopoly-saccharide(LPS),liver tumor necrosis factor(TNF)-αand liver triglycerides were *** microbiota were analyzed using a 16S r DNA sequencing *** Compared with the FAT group,the SNS group exhibited decreased body weight,liver index,visceral fat index,serum ALT,portal LPS,liver TNF-αand liver triglycerides(P<0.05).Intestinal microbiota analysis showed that the SNS group had different bacterial composition and function compared with the FAT *** particular,Oscillospira genus was a bacterial biomarker of SNS group *** The beneficial effects of Si-Ni-San freeze-dried powder on high fat diet-induced NAFLD in mice may be associated with its anti-inflammatory and changing intestinal microbiota effects.

关键词： Nonalcoholic fatty liver disease Si-Ni-San High fat diet Intestinal microbiota Inflammation

Therapeutic effects of Clostridium butyricum on experimental colitis induced by oxazolone in rats

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2009年第15期15卷 1821-1828页

作者： hai-Qiang zhang Tomas T Ding Jun-Sheng Zhao Xin Yang hai-xia zhang Juan-Juan zhang Yun-Long Cui Qingdao Research Center of Microecology-Engineering Technology Jiaonan 266400 Shandong Province China BRITE/Department of Pharmaceutical Sciences North Carolina Central University Durham NC27707 United States Pathology Department of People's Hospital Jiaonan 266400 Shandong Province China Qingdao East Sea Pharmaceutical Co. Ltd Jiaonan 266400 Shandong Province China

AIM： To evaluate the therapeutic effects of a probiotic supplement （Clostridium butyricum, CGMCC0313 ） in a chemically-induced rat model of experimental colitis. METHODS： An experimental ulcerative colitis model was established by rectal injection of oxazolone into the colon of 40 Wistar rats randomly divided into four groups. The positive control group was sacrificed 3 d after colitis onset. The remaining groups were fed daily with either 2 mL of C. butyricum （2.3 × 10^11 CFU/L）, 2 mL of mesalamine （100 g/L）, or 1 mL of sodium butyrate （50 mmol/L） for 21 d. The animals＇ body weight, behavior, and bowel movements were recorded weekly. After sacrifice, visual and microscopic observations of pathological changes of colon tissue were made, body weight and wet colon mass index were measured and recorded, and serum levels of interleukin-23 （IL-23） and TNF-α were measured using ELISA. Expression of calcitonin gene-related peptide in colon tissue was measured by RT-PCR. Finally, changes in rat intestinal microflora status were measured in all *** the serum levels of both IL-23 and tumor necrosis factor-α （TNF-α） with similar or even better efficiency than that of mesalamine or sodium butyrate. The rat intestinal flora appeared to recover more quickly in the group treated with C. butyricum than in the mesalamine and sodium butyrate groups. Finally, we found that the expression level of calcitonin gene related peptide was elevated in colon tissue in the sodium butyrate treated group but not in the C. butyricum or mesalamine treated groups, indicating a sensitization of colon following sodium butyrate treatment. CONCLUSION： In our experimental colitis model, treatment with C. butyricum CGMCC0313, a probiotic supplement, is at least as efficient as treatment with mesalamine.

关键词： Clostridium butyricum Interleukin-23 Tumor necrosis factor-m Calcitonin gene relatedpeptide Colitis

Polymerase chain reaction-based assays facilitate the breeding and study of mouse models of Klinefelter syndrome

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2022年第1期24卷 102-108页

作者： hai-xia zhang Yu-Lin Zhou Wen-Yan Xu xiao-Lu Chen Jia-Yang Jiang xiao-Man Zhou Zeng-Ge Wang Rong-Qin Ke Qi-Wei Guo United Diagnostic and Research Center for Clinical Genetics Women and Children’s HospitalSchool of Medicine and School of Public HealthXiamen UniversityXiamen 361102China School of Biomedical Sciences and School of Medicine Huaqiao UniversityQuanzhou 362021China Beijing Children’s Hospital Capital Medical UniversityBeijing 100045China

Klinefelter syndrome(KS)is one of the most frequent genetic abnormalities and the leading genetic cause of nonobstructive *** breeding and study of KS mouse models are essential to advancing our knowledge of the underlying pathological *** and fluorescence in situ hybridization are reliable methods for identifying chromosomal ***,technical issues associated with these methods can decrease the efficiency of breeding KS mouse models and limit studies that require rapid identification of target *** overcome these limitations,we developed three polymerase chain reaction-based assays to measure specific genetic information,including presence or absence of the sex determining region of chromosome Y(Sry),copy number of amelogenin,X-linked(Amelx),and inactive X specific transcripts(Xist)*** a combined analysis of the assay results,we can infer the karyotype of target *** confirmed the utility of our assays with the successful generation of KS mouse *** assays are rapid,inexpensive,high capacity,easy to perform,and only require small sample ***,they facilitate the breeding and study of KS mouse models and help advance our knowledge of the pathological mechanism underlying KS.

关键词： 40,XXY^(*)mouse 41,XXY mouse Klinefelter syndrome mouse model

Stabilizing oxygen redox reaction in phase-transition-free P2-type Co/Nifree cathode via Cu doping for sodium-ion batteries

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 China Materials 2024年第11期67卷 3629-3636页

作者： hai-xia zhang Lin-Rong Wu Hao-Rui Wang Dong-Zheng Wu Shao-Hui Guo Ding zhang xiao-Chuan Duan xian-Ming zhang College of Chemical Engineering and Technology Taiyuan University of TechnologyTaiyuan 030024China School of Chemical Engineering and Pharmacy Wuhan Institute of TechnologyWuhan 430205China

Due to their high capacity,the P2-type layered oxide cathodes containing oxygen redox reaction processes have attracted wide attention for sodium-ion ***,these materials usually exhibit poor electro-chemical properties,resulting from irreversible oxygen redox reactions and phase transition processes at high voltages,and thus hinder their large-scale *** work reveals the mechanism for the significantly improved cycle stability and rate performance of Co/Ni-free Na_(0.7)5Li_(0.25-2/3x)CuxMn_(0.75-1/3x)O_(2)via Cu ***-situ XPS demonstrates that Cu doping reduces the amount of Mn^(3+)that triggers the Jahn-Teller effect during the *** addition,the electron enrichment of oxygen around Cu can alleviate the irreversible oxidation of oxygen,and thus suppressing the phase transition originates from the rapid weakening of the electrostatic repulsion between ***,in-situ XRD results verify that the Na_(0.7)5Li_(0.19)Cu_(0.09)Mn_(0.7)2O_(2)maintains the P2 phase structure during charging and discharging,resulting in a near-zero strain characteristic of 1.9%.Therefore,the optimized cathode delivers a high reversible capacity of 194.9 mAh g−1 at 0.1 C and excellent capacity retention of 88.6%after 100 cycles at 5 *** full cell paired with commercial hard carbon anode delivers energy density of 240 Wh kg−*** research provides an idea for designing a new type of intercalated cathode for sodium-ion batteries with low cost and high energy density.

关键词： sodium-ion batteries Co/Ni-free Cu doping oxygen redox reaction phase transition.