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A_(2)B_(7)-type La-Mg-Ni alloys prepared by Mg thermal diffusion for improved hydrogen storage performance

Rare Metals 2024年第7期43卷 3260-3272页

作者： Yong-Xi Zhang Guan-Jiu wu Jing Gu Hong-Xing Kang yuan Li Di Zhou Wen-Feng Wang Lu Zhang Shu-Min Han Hebei Key Laboratory of Applied Chemistry School of Environmental and Chemical EngineeringYanshan UniversityQinhuangdao 066004China Department of Chemistry and Biochemistry San Diego State UniversitySan DiegoCA92182-1030USA State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China

A novel approach based on thermal diffusion was used to achieve controllable Mg content in A_(2)B_(7)-type La-Mg-Ni-based *** formation mechanism of the A_(2)B_(7)-type phase as a result of the thermal diffusion process and the effect of Mg content on hydrogen storage performance were investigated.X-ray diffraction(XRD)patterns and Rietveld refinement results showed that increased Mg transformed the LaNi_(5)phase in the La_(0.74)Sm_(0.03)Y_(0.23)Ni_(4.32)Al_(0.04)precursor alloy into a superlattice *** electron microscopy(SEM)images showed that Mg was evenly distributed in the alloy *** in the superlattice significantly inhibited the phase decomposition of the superlattice structure during the hydrogen absorption/desorption *** A_(2)B_(7)-type La_(0.57)Sm_(0.02)Y_(0.18)Mg_(0.23)Ni_(3.38)Al_(0.03)alloy composed of Gd_(2)Co_(7)and Ce_(2)Ni_(7)phases was successfully *** pressure-composition isotherm profiles showed that the alloy had a hydrogen storage capacity as high as 1.73 wt%,with good cycling *** 50 cycles of hydrogen absorption/desorption,the alloy retained a hydrogen storage capacity of 1.45 wt%,with a capacity retention rate of up to 84.28%.The Mg thermal diffusion process thus provides a new approach for the controlled preparation of La-Mg-Ni-based alloys.

关键词： La-Mg-Ni-based hydrogen storage alloy A_(2)B_(7)-type superlattice alloy Mg thermal diffusion process Phase transformation Hydrogen storage property

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Retinal microvasculature is a potential biomarker for acute mountain sickness

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Science China(Life Sciences) 2023年第6期66卷 1290-1302页

作者： yuan Xie Diya Yang Alex S.Huang Yiquan Yang Ying Han Yunxiao Sun Kai Cao Huaizhou Wang Shizheng wu Qiang Zhu Guozhong Wang Tianyi wu Ningli Wang Beijing Tongren Eye Center Beijing Tongren HospitalCapital Medical UniversityBeijing Ophthalmology and Visual Sciences Key LaboratoryBeijing100730China Beijing Institute of Ophthalmology Beijing Tongren HospitalCapital Medical UniversityBeijing100005China The Viterbi Family Department of Ophthalmology Shiley Eye InstituteUniversity of CaliforniaSan DiegoCA92121USA Department of Ophthalmology University of CaliforniaSan FranciscoCA94143USA Institution of Geriatric Qinghai Provincial Hospital Xining810007China Department of Ultrasound Beijing Tongren HospitalCapital Medical UniversityBeijing100730China Department of Hyperbaric and Hypobaric Chamber Civil Aviation General HospitalBeijing100025China National Key Laboratory of High Altitude Medicine China High Altitude Medical Research InstituteXining810012China

Increased cerebral blood flow resulting from altered capillary level autoregulation at high altitudes leads to capillary overperfusion and then vasogenic cerebral edema,which is the leading hypothesis of acute mountain sickness(AMS).However,studies on cerebral blood flow in AMS have been mostly restricted to gross cerebrovascular endpoints as opposed to the *** study aimed to investigate ocular microcirculation alterations,the only visualized capillaries in the central neural system(CNS),during early-stage AMS using a hypobaric *** study found that after high altitude simulation,the optic nerve showed retinal nerve fiber layer thickening(P=0.004–0.018)in some locations,and the area of the optic nerve subarachnoid space(P=0.004)*** coherence tomography angiography(OCTA)showed increased retinal radial peripapillary capillary(RPC)flow density(P=0.003–0.046),particularly on the nasal side of the *** AMSpositive group had the largest increases in RPC flow density in the nasal sector(AMS-positive,?3.21±2.37;AMS-negative,?0.01±2.16,P=0.004).Among multiple ocular changes,OCTA increase in RPC flow density was associated with simulated early-stage AMS symptoms(beta=0.222,95%CI,0.009–0.435,P=0.042).The area under the receiver operating characteristics curve(AUC)for the changes in RPC flow density to predict early-stage AMS outcomes was 0.882(95%CI,0.746–0.998).The results further confirmed that overperfusion of microvascular beds is the key pathophysiologic change in early-stage *** OCTA endpoints may serve as a rapid,noninvasive potential biomarker for CNS microvascular changes and AMS development during risk assessment of individuals at high altitudes.

关键词： optical coherence tomography angiography retinal microvasculature acute mountain sickness

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Highly efficient nanoporous CoBP electrocatalyst for hydrogen evolution reaction

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Rare Metals 2021年第5期40卷 1031-1039页

作者： Hui-Lan Guang Sheng-Li Zhu Yan-Qin Liang Shui-Lin wu Zhao-Yang Li Shui-yuan Luo Zhen-Duo Cui Akihisa Inoue School of Materials Science and Engineering Tianjin UniversityTianjin 300350China School of Materials Science and Engineering Lanzhou Jiaotong UniversityLanzhou 730070China College of Chemistry Engineering and Materials Science Quanzhou Normal UniversityQuanzhou 362000China International Institute of Green Materials Josai International UniversityTogane 283-8555Japan Department of Physics King Abdulaziz UniversityJeddah 22254Saudi Arabia

Water splitting is an environment friendly and efficient way to produce *** efficient and low-cost non-noble metal catalysts play an important role in hydrogen evolution reaction(HER).Dealloying is a simple method to prepare three-dimensional self-supporting nanoporous materials without conductive supports and *** this work,we prepared self-supporting nanoporous CoBP electrocatalyst by dealloying *** influence of the synergistic effect of nonmetallic elements on catalytic activity was *** synergistic electronic effect of Co,B and P atoms on the surface optimizes the H atoms desorption and results in superior HER *** bi-continuous structure of nanoporous CoBP provides more active area and favors of electron and electrolyte *** nanoporous CoBP with the B/P atomic ratio of 1/3 exhibits low overpotential of 42 mV at 10 mA·cm^(-2),small Tafel slope of 39.8 mV·dec-1 and good long-term stability with no performance decrease for 20 h in alkaline solution.

关键词： Hydrogen evolution reaction Nanoporous Self-supporting electrocatalyst Co-B-P alloy Dealloying

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Coercivity enhancement of hot-deformed NdFeB permanent magnets with AlCuZn eutectic alloy grain boundary diffusion

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Rare Metals 2022年第1期41卷 226-231页

作者： Ye-Qi Yu Kuo-She Li Hai-Jun Peng Xin-yuan Bai Ning-Tao Quan Kai-Wen wu Yang Luo Dun-Bo Yu National Engineering Research Center for Rare Earth Materials General Research Institute for Nonferrous MetalsBeijing 100088China GRIREM Advanced Materials Co.Ltd.Beijing 100088China

It is approved that grain boundary diffusion is an effective method to increase the coercivity of hot-deformed NdFeB *** this paper,a new rare earth-free grain boundary diffusion source of hot-deformed magnet was *** powders blended with commercial NdFeB powders were hot-compacted to obtain fully dense magnets,hot-deformed into anisotropic magnets and finally annealed to gain better ***,the influences of annealing temperature and time on the magnetic properties of the specimens were studied and the optimal parameters of 600℃ and 60 min were ***,by changing the proportions of AlCuZn grain boundary diffusion,the coercivity,remanence and maximum energy product of the hot-deformed NdFeB magnets were *** result showed that with 1.0 wt%AlCuZn grain boundary diffusion and annealing at 600℃ for 60 min,the coercivity rose from 828 to 987 kA·m^(-1) without deteriorating the *** analysis confirmed that AlCuZn diffused into the intergranular boundaries and the magnet diffused with AlCuZn possessed finer grains than that of without AlCuZn grain boundary diffusion.

关键词： AlCuZn Grain boundary diffusion Hotdeformed Coercivity enhancement

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IP Lyn:A Totally Eclipsing Contact Binary with an Extremely Low Mass Ratio

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Research in Astronomy and Astrophysics 2023年第8期23卷 206-219页

作者： Zi-Xuan Yin Zi-Bin Meng Pei-Ru wu Xu-Dong Zhang Yun-Xia Yu Ke Hu Fu-yuan Xiang Key Laboratory of Star and Interstellar Medium Xiangtan UniversityXiangtan 411105China School of Physics and Electronic Science Guizhou Normal UniversityGuiyang 550025China Department of Physics Xiangtan UniversityXiangtan 411105China

We present the first photometric and orbital period investigations for a neglected totally eclipsing contact binary IP *** photometric solutions derived from both ground-based and several surveys'observations suggest that it is a shallow contact binary with an extremely low mass ratio of *** weak asymmetry observed in our multiple band light curves can be interpreted as a result of an active cool spot on the *** absolute physical parameters were determined with the Gaia-distance-based method and checked by an empirical *** the eclipse timings collected from the literature and those derived from our and variable surveys'observations,we find that IP Lyn has been undergoing a secular orbital period increase for the past two decades,implying a mass transfer from the less massive secondary to the *** comparing the current parameters with the critical instability ones,we infer that IP Lyn is currently stable in spite of its relatively low mass ratio and orbital angular ***,from a catalog of 117 extremely low mass ratio contact binaries,we find that their orbital angular momenta are significantly lower than those of the contact binaries with a relatively high mass ratio,suggesting they should be at the late evolutionary stage of a contact binary.

关键词： (stars")binaries(including multiple) close-(stars:)binaries eclipsing-stars evolution-stars individual(IP Lyn)

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Electrochemically activated metal oxide sites at Rh-Ni2P electrocatalyst for efficient alkaline hydrogen evolution reaction

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Rare Metals 2024年第12期43卷 6416-6425页

作者： Cheng Peng Jia-Yi Li Luo-Xiang Shi Ming-Yue Wang Wen-Hai Wang Tao Cheng Pei-zhi Yang Hao Yang Kong-Lin wu Institute of Clean Energy and Advanced Nanocatalysis (iClean) School of Chemistry and Chemical EngineeringAnhui University of Technology Institute of Functional Nano&Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials & DevicesSoochow University Key Laboratory of Advanced Technique & Preparation for Renewable Energy Materials Ministry of EducationYunnan Normal University

Highly efficient hydrogen evolution reaction（HER） electrocatalysts play a crucial part in generating green ***,an electrochemical activation approach was applied to design 6.7 Rh-Ni2P-800CV electrocatalysts in alkaline *** results confirm that the generation of metal oxide sites through the electrochemical activation strategy can effectively improve the intrinsic activity of 6.7 *** density functional calculations further confirm that metal oxide active sites are favorable for H2O adsorption and activation and H*adsorption/*** 6.7 Rh-Ni2P-800CV possesses significantly enhanced HER performance with low overpotential（25 mV at 10 mA·cm2）,small Tafel(60 mV·dec-1) and robust stability in 1.0 M KOH,outperforming Pt/C and 6.7 Rh-Ni2P ***,6.7 Rh-Ni2P-800CV can even operate at a large current density(550 mA·cm-2) up to 90 h with an overpotential of 320 mV,which meets the requirements of industrial water ***'s more,the overall watersplitting systems（6.7 Rh-Ni2P-800CV ‖ 6.7 Rh-Ni2P-800CV） can be directly driven by the solar *** work highlights that electrochemical activation technology provides a robust avenue toward constructing efficient electrocatalysts for sustainable energy conversion.

关键词： Alkaline water electrolysis Electrocatalysis Metal oxides Solar-powered hydrogen production Transition metal phosphide

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Dosage effect genes modulate grain development in synthesized Triticum durum-Haynaldia villosa allohexaploid

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Journal of Genetics and Genomics 2024年第10期51卷 1089-1100页

作者： Zhongyu Yu Baofeng Cui Jin Xiao wu Jiao Haiyan Wang Zongkuan Wang Li Sun Qingxin Song Jingya yuan Xiue Wang State Key Lab of Crop Genetics&Germplasm Enhancement and Utilization Cytogenetics InstituteNanjing Agricultural University/JCIC-MCP/Zhongshan Biological Breeding LaboratoryNanjingJiangsu 210095China

Polyploidization in plants often leads to increased cell size and grain size,which may be affected by the increased genome dosage and transcription *** synthesized Triticum durum(AABB)-Hay-naldia villosa(WM)amphiploid(AABBM)has significantly increased grain size,especially grain length,than the tetraploid and diploid *** investigate how polyploidization affects grain development at the transcriptional level,we perform transcriptome analysis using the immature seeds of ***,***,and the *** dosage effect genes are contributed more by differentially expressed genes from genome V of *** dosage effect genes overrepresent grain development-related ***-estingly,the vernalization gene TaVRN1 is among the positive dosage effect genes in the *** and *** *** expression levels of TaVRN1 homologs are positively correlated with the grain size and *** TaVRN1-B1 or TaVRN1-D1 mutation shows delayed florescence,decreased cell size,grain size,and grain *** data indicate that dosage effect genes could be one of the important explanations for increased grain size by regulating grain *** identification and functional validation of dosage effect genes may facilitate the finding of valuable genes for improvingwheat yield.

关键词： Allopolyploid Polyploidization Dosage effect Wheat Grain size TaVRN1

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Suppressing irreversible phase transition and enhancing electrochemical performance of Ni-rich layered cathode LiNi_(0.9)Co_(0.05)Mn_(0.05)O_(2) by fluorine substitution

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Journal of Energy Chemistry 2021年第10期30卷 574-581,I0015页

作者： Qi-Qi Qiu Shan-Shan yuan Jian Bao Qin-Chao Wang Xin-Yang Yue Xun-Lu Li Xiao-Jing wu Yong-Ning Zhou Department of Materials Science Fudan UniversityShanghai 200433China

Ni-rich layered oxide LiNi_(x)Co_(y)Mn_(1-x-y)O_(2)(x≥0.8)is the most promising cathodes for future high energy automotive lithium-ion ***,its application is hindered by the undesirable cycle stability,mainly due to the irreversible structure change at high ***,we demonstrate that F substitution with the appropriate amount(1 at%)is capable for improve the electrochemical performance of LiNi_(0.9)Co_(0.05)Mn_(0.05)O_(2) cathode *** is revealed that F substitution can reduce cation mixing,stabilize the crystal structure and improve Li transport *** resulted LiNi_(0.9)Co_(0.05)Mn_(0.05)O_(1.99)F_(0.01)cathode can deliver a high capacity of 194.4 mAh g^(-1) with capacity retention of 95.5%after 100 cycles at 2 C and 165.2 mAh g^(-1) at 5 ***-situ synchrotron X-ray technique proves that F ions in the cathode materials can suppress the irreversible phase transition from H2 phase to H3 phase in high voltage region by preventing oxygen gliding in a-b planes,ensuring a long-term cycle stability.

关键词： Lithium batteries Cathode materials Nickel-rich Phase transition Fluorine substitution

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Expression and predictive value of miR-489 and miR-21 in melanoma metastasis

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World Journal of Clinical Cases 2019年第19期7卷 2930-2941页

作者： Hao Mo Jian Guan Zhen-Chao yuan Xiang Lin Zhen-Jie wu Bin Liu Ju-Liang He Department of Bone and Soft Tissue Surgery Guangxi Medical University Cancer Hospital

BACKGROUND Melanoma is a highly malignant skin tumour, and is one of the most rapidly growing malignant tumors in recent years. According to statistics, the morbidity of cancer increases with age, accounting for 1.6% of new cancer cases and 0.6% of deaths worldwide. Melanoma has a serious impact on society and families, thus it is of great significance to find biological markers related to the diagnosis and treatment of *** To explore the expression and predictive value of mir-489 and mir-21 in melanoma *** A total of 60 patients with malignant melanoma treated at our hospital from June2017 to December 2018 were selected as a research group, while 40 healthy subjects were selected as a control group. qRT-PCR technique was used to detect miR-489 and miR-21 in serum of the two groups. ROC curve was drawn to evaluate the predictive value and diagnostic efficiency. Spearman test was used for correlation analysis. Logistic single-and multiple-factor analyses were performed to identify the risk factors related to melanoma *** The expression of miR-489 in the research group was significantly lower than that in the control group(P < 0.001). However, the expression of miR-21 in the research group was significantly higher than that in the control group(P < 0.001).The expression of miR-489 and miR-21 was related to TNM stage and metastasis(P < 0.001). In the diagnosis of melanoma patients, the sensitivity, specificity, and AUC of miR-489 alone were 75.56%, 80.00%, and 0.852, respectively. The sensitivity, specificity, and AUC of miR-21 alone were 77.78%, 82.22%, and 0.844,respectively. MiR-489 was negatively correlated with TNM stage of melanoma(r=-0.612, P < 0.001), while miR-21 was positively correlated with TNM stage(r =0.609, P < 0.001). Logistic single-and multiple-factor regression analyses showed that TNM stage, miR-489, and mir-21 were independent risk factors for malignant melanoma *** MiR-489 and miR-21 may par

关键词： MiR-489 MiR-21 Melanoma metastasis Predictive value

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Brain metastasis treated with Cyberknife

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Chinese Medical Journal 2009年第16期122卷 1847-1850页

作者： WANG zhi-zhen yuan zhi-yong ZHANG Wen-cheng YOU Jin-qiang WANG Ping Key Laboratory of Cancer Prevention and Therapy and Department of Radiation Therapy Tianjin Cancer Hospital of Tianjin Medical University Tianjin 300060 China

Background Cyberknife can greatly raise the fractional dose of stereotactic radiosurgery, thus improving its clinical efficacy. We retrospectively analyzed clinical outcomes of brain metastasis treated with Cyberknife. Methods We analyzed 40 cases of brain metastases treated with Cyberknife in the Tianjin Cancer Hospital from August 1, 2006 to August 1, 2007, for a total of 68 lesions with maximal diameter of 0.4-7.5 cm （average 1.88 cm）. Total hypofractional radiated dosage was 18-36 Gy （5-25 Gy/F, 1-5 F） by Cyberknife. We evaluated the remission rate of clinical symptoms, correlation factors to new foci, 3-month local control rates, and 3-month and 1-year survival rates. All patients were followed up for more than 14 months. Results After 1 week, clinical remission was 90.0% （36/40）. After 3 months, the local control rate and therapeutic effective rate were 77.9% （53/68） and 94.1% （64/68）, respectively, as observed by cranium augmentation CT or MRI. The three-month, six-month and 1-year survival rates were 97.5% （39/40）, 82.5% （33/40） and 67.5% （27/40）, respectively. Fourteen patients had neopathy outside the original lesion after 3 months. Neopathy was not correlated with age, whole-brain radiotherapy, number of original lesions, maximum diameter of the original lesion, therapeutic dose per fraction, therapeutic frequency or total therapeutic dose. Conclusions Cyberknife got perfect clinical outcomes by higher dosage per fraction. It is an appropriate and valid treatment shortcut for brain metastasis.

关键词： Cyberknife brain tumor metastasis clinical practice whole brain radiotherapy

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