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Effects of cerium substitution on phase components, microstructures and magnetic properties of Nd-Fe-Ti-B alloy

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Journal of Rare Earths 2019年第8期37卷 861-864,I0003页

作者： Haijun Peng yang Luo Yakun Dou Xinyuan Bai Wenlong Yan Dunbo Yu yuanfei yang Shulin Diao National Engineering Research Center for Rare Earth Materials General Research Institute for Nonferrous MetalsGrirem Advanced Materials Co.Ltd.Beijing 100088China Tianhe(Baotou)Advanced Tech Magnet Co. Ltd.Baotou 014010China

(Nd(1-x)Cex)(12)Fe(77)Ti5B6(x=0,0.2,0.3,0.4,0.6,0.8)alloys were prepared by melt-spinning and annealing *** phase constitutions,microstructures and magnetic properties were investigated by powder X-ray diffraction(XRD),a differential scanning calorimeter(DSC),a vibrating sample magnetometer(VSM)and a transmission electron microscope(TEM).It is found that with the increase of Ce content,the coercivity of the(Nd(1-x)Cex)(12)Fe(77)Ti5B6 alloys reaches maximum first and then *** maximum coercivity reaches 18.5 kOe obtained in the sample of 20%Ce substituted which is 34%higher than the Ce-free *** results reveal that the micro structure refinement effect is responsible for the coercivity *** phenomenon implies that in some cases,Ce and Ti co-doping is more beneficial to improving of the coercivity than Ti single doping in Nd-Fe-B *** further Ce addition,magnetic properties deteriorate due to the formation of CeFe2 and TbCu7-type phases.

关键词： Melt spun Nd-Ce-Fe-Ti-B Coercivity Microstructure refinement Magnetic Rare earths

Recent advancements in continuously scalable conversion-ratio switched-capacitor converter

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Journal of Semiconductors 2024年第4期45卷 8-11页

作者： Mo Huang yuanfei Wang Rui P.Martins Yan Lu State Key Laboratory of Analog and Mixed-Signal VLSI Institute of MicroelectronicsUniversity of MacaoMacaoChina

Switched-capacitor(SC)DC-DC converter[1]is an impor-tant alternative to inductive DC-DC converter,in terms of removing the bulky power ***,it is widely used in low-profile,low-power applications,such as the internet of things(IoT)sensor nodes and energy harvesting[2].Mean-while,considering that capacitor has a much higher energy density than inductor,high-power applications.

关键词： converter switched removing

Integrated separation-electrochemical detection device based on wood column for online identification of enantiomer

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Nano Research 2024年第3期17卷 1893-1901页

作者： Junli Guo yuanfei Xue Chenxi Zhao Junjian Zhao Zhida Gao Ye Mei Yan-Yan Song College of Sciences Northeastern UniversityShenyang 110004China State Key Laboratory of Precision Spectroscopy School of Physics and Electronic ScienceEast China Normal UniversityShanghai 200062China NYU-ECNU Center for Computational Chemistry at NYU Shanghai Shanghai 200062China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

Chiral chemicals have attracted significant interest in the pharmaceutical industry,yet the separation methods to get pure enantiomers from racemic mixture are still *** date,the separation of enantiomers still mainly depends on chromatography using high-cost chiral stationary ***,wood channels were used as the handheld integrated device,and enantiomer separation was simultaneously detected using an electrochemical *** this method,a chiral UIO-66(L-UIO-66)modified enantiomer separation zone and carbonized wood based online detection zone are integrated along a single wood *** on the in situ separation results from the chronoamperometry data,the wood device shows excellent separation ability for a wide range of electrochemically active enantiomers,including 3,4-dihydroxyphenylalanine,amino acids,ascorbic acid,carnitine,and penicillamine with high chirality *** unbiased molecular dynamic simulations indicate that the excellent chiral recognition and separation are attributed to the different barriers from the bound states to the dissociated state of the enantiomers in the homochiral microenvironment of the *** integrated enantiomer separation-electrochemical detection device provides a novel,easy,and low-cost platform for the separation of pure enantiomer from racemic mixture.

关键词： wood column integrated separation-detection device enantioselectivity online sensing free energy barrier

The OsCLV2s-OsCRN1 co-receptor regulates grain shape in rice

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Journal of Genetics and Genomics 2024年第7期51卷 691-702页

作者： Xingxing Li Meng-en Wu Juncheng Zhang Jingyue Xu yuanfei Diao Yibo Li National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research(Wuhan) Huazhong Agricultural UniversityWuhanHubei 430070China Hubei Hongshan Laboratory WuhanHubei 430070China

The highly conserved CLV–WUS negative feedback pathway plays a decisive role in regulating stem cell maintenance in shoot and floral meristems in higher plants,including Arabidopsis,rice,maize,and ***,we find significant natural variations in the OsCLV2c,OsCLV2d,and OsCRN1 loci in a genome-wide association study of grain shape in ***2a,OsCLV2c,OsCLV2d,and OsCRN1 negatively regulate grain length–width ratio and show distinctive geographical distribution,indica–japonica differentiation,and artificial selection ***,OsCLV2a and OsCRN1 interact biochemically and genetically,suggesting that the two components function in a complex to regulate grain shape of ***,the genetic contributions of the haplotypes combining OsCLV2a,OsCLV2c,and OsCRN1 are significantly higher than those of each single gene alone in controlling key yield *** findings identify two groups of receptor-like kinases that may function as distinct co-receptors to control grain size in rice,thereby revealing a previously unrecognized role of the CLV class genes in regulating seed development and proposing a framework to understand the molecular mechanisms of the CLV–WUS pathway in rice and other crops.

关键词： Rice Grain shape OsCLV2s OsCRN1 Natural variations Indica-japonica differentiation

Corrosion resistance and magnetostrictive properties of(Tb_(0.3)Dy_(0.7))Fe_2 alloy modified by nitrogen ion implantation

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Journal of Rare Earths 2015年第6期33卷 629-632页

作者：杨红川张世荣于敦波李扩社胡权霞杨远飞张坤李红卫 National Engineering Research Center for Rare Earth Materials General Research Institute for Nonferrous Metalsand Grirem Advanced Materials Co. Ltd.

The corrosion resistance and magnetostriction of （Tb0.3Dy0.7）Fe2 alloy were investigated for different nitrogen doses of 5Х 1015, 5Х 1016, 5Х 1017, 1 Х 1018 ions/cm2 and average ion energy of 140 kV. The phase and elements concentration in the implanted layer were examined by X-ray diffraction and auger electron spectroscopy, respectively. The aqueous corrosion studies were carried out in 3.5% NaC1 solutions. It was found that corrosion resistance had improved substantially with respect to the untreated substrates. The corrosion resistance was maximum at a dose of 5x1017 ions/cm2, and saturation in corrosion improvement was noticed at a higher dose, 10~ 1017 ions/cm2. In contrast, the results of magnetostriction tests before and after ion implantation showed that the influence of ni- trogen ion implantation on the magnetostrictive properties turned out to be small. Finally, a model was applied to interpret the influ- ence of nitrogen implantation on the magnetostriction in the light of the information provided by the experimental results in this study.

关键词： magnetostriction ion implantation corrosion concentration distribution rare earths 1

氢爆工艺(HD)对钕铁硼磁粉粒度和形状的影响研究

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稀有金属 2021年第1期45卷 123-128页

作者：王子龙罗阳杨远飞吴桂勇武凯文于敦波有研科技集团有限公司有研稀土新材料股份有限公司稀土材料国家工程研究中心北京100088

采用热处理态钕铁硼平板铸锭作为母合金,通过氢爆工艺将平板铸锭破碎成磁粉。研究了氢爆工艺过程中温度、氢压对钕铁硼磁粉的破碎程度、粒度和形状的影响。实验发现,随着温度和氢压的提高,吸氢过程活化时间逐渐缩短,当温度为300℃,氢压... 详细信息

采用热处理态钕铁硼平板铸锭作为母合金,通过氢爆工艺将平板铸锭破碎成磁粉。研究了氢爆工艺过程中温度、氢压对钕铁硼磁粉的破碎程度、粒度和形状的影响。实验发现,随着温度和氢压的提高,吸氢过程活化时间逐渐缩短,当温度为300℃,氢压为0.1 MPa时,活化过程消失,铸锭一旦暴露在氢气中,吸氢过程直接发生。热处理态平板铸锭吸氢之后,破碎得到的磁粉大部分为粒度在178μm下的细粉,且随着氢压的提高,氢爆后细粉所占的质量分数趋势上是单调增加的。磁粉细粉粒度分布对氢压的变化不敏感,但是在相同氢压下,从室温到300℃,随着温度升高,磁粉平均粒度明显变粗。磁粉形状大部分为颗粒状,对应氢爆时富Nd相和Nd_(2)Fe_(14)B相间的沿晶断裂,少数呈尖角、针棒等不规则形状,可能与Nd_(2)Fe_(14)B相内穿晶断裂的发生有关。随着实验温度升高,氢爆-脱氢后的磁粉Nd_(2)Fe_(14)B相的衍射峰峰位向高角度发生偏移,原因是更高温度有利于脱氢,导致含氢量逐渐减少。不同氢压条件下,Nd_(2)Fe_(14)B相衍射峰位基本不变。

关键词：钕铁硼氢爆粒度形状

Non-proteolytic ubiquitination of HBx controls HBV replication

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Virologica Sinica 2024年第2期39卷 338-342页

作者： Xiangpeng Sheng Yi yang Min Zhu Linlin Zhou Fang Zhu yuanfei Zhu Siying Dong Hui Kong Honghua Wang Ji Jiang Mingyue Wan Mingyang Feng Qiang Deng Yumin Xu Qing You Ronggui Hu State Key Laboratory for Animal Disease Control and Prevention Harbin Veterinary Research InstituteChinese Academy of Agricultural SciencesHarbin 150069China State Key Laboratory of Molecular Biology Shanghai Institute of Biochemistry and Cell BiologyCenter for Excellence in Molecular Cell ScienceChinese Academy of SciencesShanghai 200031China Key Laboratory of Systems Health Science of Zhejiang Province School of Life ScienceHangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesHangzhou 310024China Department of Thoracic Surgery Ruijin HospitalShanghai Jiaotong University School of MedicineShanghai 200025China Shanghai Key Laboratory of Plant Molecular Sciences College of Life SciencesShanghai Normal UniversityShanghai 200234China Department of Pathogenic Biology West China School of Basic Medical Sciences&Forensic MedicineSichuan UniversityChengdu 610041China School of Medicine Guizhou UniversityGuiyang 550025China Key Laboratory of Medical Molecular Virology(MOE&MOH) School of Basic Medical SciencesFudan UniversityShanghai 200032China Department of Hospital Infection Management Department of Infectious DiseasesRuijin HospitalShanghai Jiao Tong University School of MedicineShanghai 200025China School of Biomedical Engineering Shanghai Jiao Tong UniversityShanghai 200240China

Dear Editor,Although effective vaccines and antiviral therapies are available,hepatitis B virus(HBV)infection is still a serious global health *** HBV infection remains the principal cause of liver cirrhosis and hepatocellular carcinoma(HCC).HBV is a small DNA virus,owning a~3.2 kb genome that encodes several proteins:viral DNA polymerase,core antigen(HBcAg),E antigen(HBeAg),three surface antigens(PreS1/PreS2/HBsAg),and a regulatory X protein(HBx)(Lamontagne et al.,2016).X protein,named for its lack of homology with any known proteins,is a 154 aa protein that plays an essential role in HBV biology and regulates the development of HCC(yang et al.,2022).Although previous studies have strongly expanded our understanding of HBx,the regulation of HBx is not completely elucidated.

关键词： infection cirrhosis

基于二叉树型卷积神经网络信息融合的人脸验证

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计算机应用 2017年第A2期37卷 155-159页

作者：杨子文曾上游杨远飞广西师范大学电子工程学院广西桂林541004

近年来卷积神经网络(CNN)在人脸识别领域有着显著的进步,但是这些卓越的方法是建立在大规模数据、更深和更宽的网络、复杂的算法的基础之上,而且还需要长时间的训练。为此结合深度残差网络提出了一个二叉树型信息融合网络模型。首先,在... 详细信息

近年来卷积神经网络(CNN)在人脸识别领域有着显著的进步,但是这些卓越的方法是建立在大规模数据、更深和更宽的网络、复杂的算法的基础之上,而且还需要长时间的训练。为此结合深度残差网络提出了一个二叉树型信息融合网络模型。首先,在CNN的每个卷积层的输出特征图后引出两个卷积分支,产生两组特征图,再与父节点的一组特征相融合,然后通过激励函数输出。这种分支的融合可以使特征图的数量降低,在向前传播的过程中减少一定的信息冗余,而且也减少了网络参数的数量。第二,网络设计中通过随机翻转、随机裁剪、添加高斯噪声来增强数据,在算法优化阶段采用适应性动量估计法(Adam)以更快达到最优结果。实验结果表明,该方法在只有6.7万张的人脸数据集上达到野外标记的人脸(LFW)数据集上95.5%的正确率。所提算法在较少数据量、简单操作上取得较好的性能。

关键词：卷积神经网络人脸识别信息融合深度残差网络适应性动量估计法

Hepatitis B virus core protein as a Rab-GAP suppressor driving liver disease progression

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Science Bulletin 2024年第16期69卷 2580-2595页

作者： Yu Su Fan Bu yuanfei Zhu Le yang Qiong Wu Yuan Zheng Jianjin Zhao Lin Yu Nan Jiang Yongxiang Wang Jian Wu Youhua Xie Xinxin Zhang Yueqiu Gao Ke Lan Qiang Deng Key Laboratory of Medical Molecular Virology(MOE/NHC/CAMS) School of Basic Medical SciencesShanghai Institute of Infectious Disease and BiosecurityFudan UniversityShanghai 200032China Shanghai Frontiers Science Center of Pathogenic Microorganisms and Infection Fudan UniversityShanghai 200032China Department of Infectious Diseases Ruijin HospitalShanghai Jiao Tong University School of MedicineShanghai 200025China Laboratory of Cellular Immunity Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese MedicineShanghai 201203China State Key Laboratory of Virology College of Life SciencesWuhan UniversityWuhan 430072China

Chronic hepatitis B virus(HBV)infection can lead to advanced liver ***,we establish a transgenic murine model expressing a basic core promoter(BCP)-mutated HBV *** previous studies on the wild-type virus,the BCP-mutated HBV transgenic mice manifest chronic liver injury that culminates in cirrhosis and tumor development with ***,agonistic anti-Fas treatment induces fulminant hepatitis in these mice even at a negligible *** the BCP mutant exhibits a striking increase in HBV core protein(HBc)expression,we posit that HBc is actively involved in hepatocellular ***,HBc interferes with Fis1-stimulated mitochondrial recruitment of Tre-2/Bub2/Cdc16 domain family member 15(TBC1D15).HBc may also inhibit multiple Rab GTPase-activating proteins,including Rab7-specific TBC1D15 and TBC1D5,by binding to their conserved catalytic *** cells under mitochondrial stress,HBc thus perturbs mitochondrial dynamics and prevents the recycling of damaged ***,sustained HBc expression causes lysosomal consumption via Rab7 hyperactivation,which further hampers late-stage autophagy and substantially increases apoptotic cell ***,we show that adenovirally expressed HBc in a mouse model is directly cytopathic and causes profound liver injury,independent of antigen-specific immune *** findings reveal an unexpected cytopathic role of HBc,making it a pivotal target for HBV-associated liver disease *** BCP-mutated HBV transgenic mice also provide a valuable model for understanding chronic hepatitis B progression and for the assessment of therapeutic strategies.

关键词： Apoptosis Basic core promoter Mitophagy Rab7 Transgenic mice