检索结果-南通市图书馆

Thermal storage properties of Mg with synergistic effect of LaNi and TiH_(2)

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2023年第5期42卷 1743-1751页

作者： Qi Wan Li-Jun Jiang Zhi-Nian Li Yang Yang shu-mao wang Xiao-Peng Liu Energy Material and Technology Research Institute General Research Institute for Nonferrous MetalsBeijing100088China

The effect of LaNi and Ti on thermal storage properties of MgH_(2)was investigated.The thermal storage performances of Mg are significantly improved by adding LaNi and Ti.The pressure-composition-temperature(PCT)curves indicate that the formation enthalpy for Mg-15 wt%Ti-5 wt%LaNi sample is 73.00 kJ·mol^(-1),which approaches to the theoretical values of pure MgH_(2).The isothermal measurement indicates that,for the Mg-15wt%Ti-5 wt%LaNi,the first absorption reaction fraction within 2 min is 93.77%,increasing by 0.32%,0.24%and0.08%compared with those for Mg,Mg-5 wt%LaNi and Mg-15 wt%Ti,respectively.The first desorption reaction fraction within 2 min is 73.18%,increasing by 55.91%,9.79%and 8.12%compared with those for Mg,Mg-5wt%LaNi and Mg-15 wt%Ti,respectively.Moreover,Mg-15 wt%Ti-5 wt%LaNi has the best cyclic stability in all the samples.The thermal storage performances of Mg by adding both LaNi and Ti are improved mainly ascribed to synergistic effect of in situ formed La_(4)H_(12.19),Mg_(2)NiH_(4),H_(0.3)Mg_(2)Ni and TiH_(2)particles during cyclic process.The above analysis demonstrates that Mg-15 wt%Ti-5wt%LaNi is suitable for using as a heat storage material.

关键词： Thermal storage Magnesium hydride Thermodynamic property Kinetics performances Cyclic stability

Hydrogenation properties of(V_(0.85)Fe_(0.15))_(100-x)M_(x)-Ce BCC solid solution alloys with M=Cr,Mo,Al

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2023年第1期42卷 313-319页

作者： Yuan-Fang Wu Li-Jun Jiang wang Zhao Xiu-Mei Guo Xu-Shan Zhao Zhi-Nian Li Xiao-Peng Liu shu-mao wang Institute of Energy Materials and Technology General Research Institute for Nonferrous MetalsBeijing100088China

The structure and hydrogenation properties of (V_(0.85)Fe_(0.15))_(100-x)M_(x)-Ce(x=0,1,3,5;at%) alloys with M=Cr,Mo,Al were investigated.All the alloys show the same phase composition consisting of BCC matric and CeO_(2)phases which distribute along the grain boundary.The hydrogen capacities of (V_(0.85)Fe_(0.15))_(100-x)M_(x)-Ce change little with M,and none of them exceeds 2.0 wt%.But the plateau pressure shows remarkable linearly variation with the amount of M and the lattice parameter of BCC matric.The additions of Cr,Mo and A1 raise the plateau,but the linear relation of plateau versus BCC lattice parameter of Mo/Al-added alloys is opposite to that of Cr-added alloys and many other conventional hydrogen storage alloys.The radius of hydrogen site is introduced to explain the inconsistent.The plateau pressure of (V_(0.85)Fe_(0.15))_(100-x)M_(x)-Ce with any kind of M added increases with the contraction of the hydrogen site.The plateau pressure of (V_(0.85)Fe_(0.15))_(100-x)M_(x)-Ce can also be reflected by the stability of hydride which is judged by the enthalpy change during the dehydrogenation.

关键词： V-Fe alloy Hydride decomposition enthalpy Plateau pressure Hydrogen site Stability of hydride

Mechanochemistry and hydrogen storage properties of 2Li_(3)N+Mg mixture

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2022年第12期41卷 4223-4229页

作者： Zhi-Nian Li Hao-Chen Qiu shu-mao wang Li-Jun Jiang Jun Du Jun-Xian Zhang Michel Latroche Fermin Cuevas Department of Energy Materials and Technology General Research Institute for Nonferrous MetalsBeijing 100088China UMR7182 CMTR/ICMPE/CNRS-UPEC94320 Thiais CedexFrance

The Li-Mg-N-H hydrogen storage system is a promising hydrogen storage material due to its moderate operation temperature,good reversibility,and relatively high capacity.In this work,the Li-Mg-N-H composite was directly synthesized by reactive ball milling(RBM) of Li3N and Mg powder mixture with a molar ratio of 2:1 under hydrogen pressure of 9 MPa.More than 8.8 wt%hydrogen was absorbed during the RBM process.The phases and structural evolution during the in situ hydrogenation process were analyzed by means of in situ solidgas absorption and ex situ X-ray diffraction(XRD) measurements.It is determined that the hydrogenation can be divided into two steps,leading to mainly the formation of a lithium magnesium imide phase and a poorly crystallized amide phase,respectively.The H-cycling properties of the as-milled composite were determined by temperature-programmed dehydrogenation(TPD) method in a closed system.The onset dehydrogenation temperature was detected at 125℃,and it can reversibly desorb 3.1 wt% hydrogen under a hydrogen back pressure of 0.2 MPa.The structural evolution during dehydrogenation was further investigated by in situ XRD measurement.It is found that Mg(NH_(2))_(2)phase disappears at about 200 ℃,and Li_(2)Mg_(2)N_(3)H_(3),LiNH_(2),and Li_(2)MgN_(2)H_(2)phases coexist at even 300 ℃,revealing that the dehydrogenation process is step-wised and only partial hydrogen can be desorbed.

关键词： Mechanochemistry Hydrogen storage properties Li-Mg-N-H

Hydrogen storage properties of Li-Mg-N-B-H/ZrCoH_(3) composite with different ball-milling atmospheres

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2023年第3期42卷 1036-1042页

作者： Zhi-Nian Li Hao-Chen Qiu Xiu-Mei Guo Jian-Hua Ye shu-mao wang Li-Jun Jiang Jun Du Fermin Cuevas Department of Energy Materials and Technology General Research Institute for Nonferrous MetalsBeijing 100088China UMR7182 CMTR/ICMPE/CNRS-UPEC94320 Thiais CedexFrance

Li-Mg-N-B-H/ZrCoH_(3) composites were successfully synthesized by ball milling of the reactants under argon and hydrogen atmosphere,respectively.The composite synthesized by reactive ball milling(RBM)under hydrogen has the best hydrogen storage properties.It can desorb 3.71 wt%hydrogen in 60 min at 150℃under pressure of 0.1 MPa,and the dehydrogenation capacity reaches 4.59 wt%in 8 h.For the re-hydrogenation,5.27 wt%hydrogen was absorbed in only 10 min at 150℃under H_(2) pressure of 8 MPa.The phases of the as-milled and subsequently dehydrogenated and re-hydrogenated samples were determined by X-ray diffraction(XRD).The microstructures and elemental distributions were characterized by scanning electron microscope(SEM)and energy-dispersive spectrometer(EDS)measurements.It is shown that Mg is in situ hydrogenated and introduced homogeneous distribution of ZrCoH_(3) particles during the RBM process under hydrogen atmosphere.The activation energies for the composites were calculated by Kissinger method through differential scanning calorimetric(DSC)measurements for the dehydrogenation process with different heating rates.It is determined that the activation energy for the Li-Mg-N-B-H/ZrCoH_(3) composite synthesized by RBM under hydrogen is 79.9 kJ·mol^(-1),which is14 kJ·mol^(-1) lower than that for the sample without ZrCoH_(3) addition.The N-H bond energies were analyzed by infrared(IR)absorption spectrum,and the reasons for weakening of the N-H bond were further discussed.

关键词： Hydrogen storage Li-Mg-N-B-H Reactive ball milling Activation energy

Development of Ti_(0.85)Zr_(0.17)(Cr-Mn-V)_(1.3)Fe_(0.7)-based Laves phase alloys for thermal hydrogen compression at mild operating temperatures

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2022年第8期41卷 2588-2594页

作者： Zi-Ming Cao Pan-Pan Zhou Xue-Zhang Xiao Liu-Jun Zhan Zhi-Fei Jiang shu-mao wang Li-Jun Jiang Li-Xin Chen State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou310027China Department of Materials Science and Engineering The University of ManchesterManchesterM139PLUK Institute of Energy Materials and Technology General Research Institute for Non-ferrous MetalsBeijing100088China Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province Hangzhou310013China

Metal hydride with proper hydrogen storage properties is the key component of hydride thermal hydrogen compressor.In this work,Ti_(0.85)Zr_(0.17)(Cr-Mn-V)_(1.3)Fe_(0.7)-based alloys were developed to achieve thermal hydrogen compression at mild operating temperatures of water bath.The results indicate the single C 14-type Laves phase as well as homogeneously distributed elements of all alloys.With increased Mn content in Ti_(0.85)Zr_(0.17)Cr_(1.2-x)Mn_xFe_(0.7)V_(0.1)(x=0,0.1,0.2,0.3)alloys.

关键词： alloys hydrogen Laves

Relationship between physical activity and specific working memory indicators of depressive symptoms in university students

在线全文

学校读者我要写书评

暂无评论

World Journal of Psychiatry 2024年第1期14卷 148-158页

作者： Qun Zhao Xing wang shu-Fan Li Peng wang Xiang wang Xin Xin Suo-wang Yin Zhao-Song Yin Li-Juan mao School of Physical Education Shanghai University of SportShanghai 200438China Department of Physical Education Donghua UniversityShanghai 201620China

BACKGROUND The detection rate of depression among university students has been increasing in recent years,becoming one of the main psychological diseases that endangers their physical and mental health.According to statistics,self-harm and suicide,for which there is no effective intervention,are the second leading causes of death.AIM To explore the relationship between different elements and levels of physical activity and college students’depression-symptom-specific working memory indicators.METHODS Of 143 college students were analyzed using the Beck Depression Self-Rating Scale,the Physical Activity Rating Scale,and the Working Memory Task.RESULTS There was a significant difference between college students with depressive symptoms and healthy college students in completing verbal and spatial working memory(SWM)tasks correctly(all P0.05).CONCLUSION An increase in physical exercise among college students,particularly medium-and high-intensity exercise and exercise of 30 min or more,can improve the correct rate of completing working memory tasks.

关键词： Physical activity Depression symptoms University students Working memory

Efficient hydrogenolysis of fructose to 1,2-propanediol over bifunctional Ru-WO_(x)-MgO_(y) catalysts under mild reaction conditions via enhancing the chemoselective cleavage of C-C bonds

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 Energy Chemistry 2024年第5期92卷 311-321页

作者： shuang Luo Tie shu Min mao Haijie Yu Yuxin Zheng Daqian Ding Lingmei Liu Kexin Yao Jianjian wang School of Chemistry and Chemical Engineering State Key Laboratory of Coal Mine Disaster Dynamics and ControlInstitute of Advanced Interdisciplinary StudiesMulti-scale Porous Materials CenterChongqing UniversityChongqing 401331China Key Laboratory for Efficient Conversion and Circular Economy of Coal Chemical Engineering CollegeInner Mongolia University of TechnologyHohhot 010051Inner MongoliaChina

Selective conversion of fructose to 1,2-propanediol(1,2-PDO)is considered as a sustainable and cost-effective alternative to petroleum-based processes,however,this approach still faces challenges associated with low efficiency and harsh reaction conditions.Here,we have successfully synthesized a novel bifunctional Ru-WO_(x)-MgO_(y) catalyst through a facile'one-pot'solvothermal method.Remarkably,this catalyst exhibits exceptional catalytic performances in the conversion of fructose to 1,2-PDO under mild reaction conditions.The yield of 1,2-PDO is up to 56.2%at 140°C for 4 h under an ultra-low hydrogen pressure of only 0.2 MPa,surpassing the reported results in recent literature(below 51%).Comprehensive characterizations and density functional theory(DFT)calculations reveal that the presence of oxygen vacancies in the Ru-WO_(x)-MgO_(y) catalyst,serving as active acidic sites,facilitates the chemoselective cleavage of C-C bonds in fructose,which leads to the generation of active intermediates and ultimately resulted in the high yield of 1,2-PDO.

关键词： Biomass Fructose 1,2-Propanediol Retroaldol condensation Heterogenous catalysis

Association between Gene Polymorphisms and SNP-SNP Interactions of the Matrix Metalloproteinase 2 Signaling Pathway and the Risk of Vascular Senescence

在线全文

学校读者我要写书评

暂无评论

Biomedical and Environmental Sciences 2024年第2期37卷 146-156页

作者： LIAO Zhen Yu YANG shuo HU Song LIU Jia mao Yong Jun SUN shu Qin Department of Geriatrics the Affiliated Hospital of Qingdao UniversityQingdao 266000ShandongChina Department of Critical Care Medicine the Affiliated Hospital of Qingdao UniversityQingdao 266000ShandongChina

Objective This study aimed to explore the association of single nucleotide polymorphisms(SNP)in the matrix metalloproteinase 2(MMP-2)signaling pathway and the risk of vascular senescence(VS).Methods In this cross-sectional study,between May and November 2022,peripheral venous blood of151 VS patients(case group)and 233 volunteers(control group)were collected.Fourteen SNPs were identified in five genes encoding the components of the MMP-2 signaling pathway,assessed through carotid-femoral pulse wave velocity(cf PWV),and analyzed using multivariate logistic regression.The multigene influence on the risk of VS was assessed using multifactor dimensionality reduction(MDR)and generalized multifactor dimensionality regression(GMDR)modeling.Results Within the multivariate logistic regression models,four SNPs were screened to have significant associations with VS:chemokine(C-C motif)ligand 2(CCL2)rs4586,MMP2 rs14070,MMP2rs7201,and MMP2 rs1053605.Carriers of the T/C genotype of MMP2 rs14070 had a 2.17-fold increased risk of developing VS compared with those of the C/C genotype,and those of the T/T genotype had a19.375-fold increased risk.CCL2 rs4586 and MMP-2 rs14070 exhibited the most significant interactions.Conclusion CCL2 rs4586,MMP-2 rs14070,MMP-2 rs7201,and MMP-2 rs1053605 polymorphisms were significantly associated with the risk of VS.

关键词： Vascular senescence Pulse wave velocity(PWV) Single nucleotide polymorphism(SNP) Matrix metalloproteinase 2(MMP-2) Extracellular matrix(ECM) Structural degradation Multifactor dimensionality reduction(MDR)

Unconventional Organic Low-Dimensional Crystals:Diversity and Potential Applications

在线全文

学校读者我要写书评

暂无评论

CCS Chemistry 2024年第7期6卷 1628-1653页

作者： Jin Feng mao Sun Ying-Xin Ma Zhen-Yu Geng Chuan-Zeng wang shu-Ping Zhuo shu-Hai Chen Hong-Tao Lin Xue-Dong wang School of Chemistry and Chemical Engineering Shandong University of TechnologyZibo 255000 School of Resources and Environmental Engineering Shandong University of TechnologyZibo 255000 Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215123

Organic low-dimensional crystals have garnered escalating interests in the realms of miniaturized optoelectronics and integrated photonics.The continual expansion of molecular systems and improvement in experimental conditions have given rise to unconventional organic low-dimensional crystals,which showcase a variety of appealing structure-dependent properties in the realm of organic semiconductors,owing to their adaptable physicochemical characteristics and exceptional optoelectronics performance.Simultaneously,the development of unconventional low-dimensional crystals is filled with abundant possibilities due to their diverse application prospects.Herein,we present a comprehensive overview of advancements in research on representative cases of unconventional low-dimensional organic crystals,using a systematic and rational structural classification.Finally,we have also discussed the existing challenges and future directions,aspiring to deepen understanding and encourage further research exploration in this field.

关键词： organic semiconductor crystal growth precise synthesis noncovalent interaction integrat-ed photonics