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Effect of the Addition of High Li Concentration on the Microstructure and Mechanical Properties of Al-Mg-Si Alloys with Different Mg Contents

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Acta Metallurgica Sinica(English Letters) 2021年第12期34卷 1721-1733页

作者： Xiao-Kun Yang Bai-Qing xiong Xi-Wu Li Li-Zhen Yan zhi-Hui Li yong-An Zhang Ya-Nan Li Kai Wen State Key Laboratory of Nonferrous Metals and Processes GRINM Group Co.LtdBeijing 100088China GRIMAT Engineering Institute Co. LTDBeijing 101407China General Research Institute for Nonferrous Metals Beijing 100088China

In the present work,the microstructural characteristics and mechanical properties of Al-1.5 Mg-0.6Si and Al-3.0 Mg-0.6Si alloy containing 3 wt%Li were investigated by optical microscopy(OM),X-ray diffraction analysis(XRD),scanning electron microscopy(SEM),time of flight-secondary ion mass spectrometry(SIMS),transmission electron microscopy(TEM),and mechanical performance *** addition of Li reduces the density of the base alloy by up to 8.4%.The residual second phases contain Mg and Si in the hot-rolled condition,but the Mg/Si atomic ratio decreases after quenching,which means that Li substitute some of the Mg and convert Mg_(2)Si into a(Mg,Li)_(2)Si phase during solution *** results of SIMS observations confirm *** high Mg-containing alloy has a more rapid hardening response compared to the low Mg-containing *** observation reveals that theδ′-Al3Li+β′′-Mg_(2)Si dual phases can be observed in the high Mg-containing alloy after aging for 100 h at 170°*** higher Mg content enhances the precipitation of theδ′phase,which results in the high Mg-containing alloy having a larger average diameter size ofδ′particles and widerδ′-precipitate-free zones(δ′-PFZs).The mechanical properties are significantly improved with the elastic modulus increasing by more than 16.5%.However,the existence of large second phases and wideδ′-PFZs in Li-containing alloys is detrimental to their ductility;as a result,their elongation is much lower than that of the base alloy.

关键词： Al-Mg-Si alloy Li addition Microstructure Aging behavior Mechanical properties Secondary ion mass spectrometer

Synthesis and Degradation of the Major Allergens in Developing and Germinating Soybean Seed

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Journal of Integrative Plant Biology 2012年第1期54卷 4-14页

作者： yong-Mei Wu Rong-Xia Guan Zhang-xiong Liu Run-zhi Li Ru-Zhen Chang Li-Juan Qiu Center of Agricultural Biotechnology Shanxi Agricultural University Taigu 030801 China National Key Facility of Gene Resources and Genetic Improvement/Key Laboratory of Crop Germplasm Utilization the Ministryof Agriculture Institute of Crop Science Chinese Academy of Agricultural Sciences Beijing 100081 China

Gly m Bd 28K, Gly m Bd 30K and Gly m Bd 60K are the major soybean （Glycine max （L.） Merr.） allergens limiting the consumption of a good protein source for sensitive individuals. However, little is known about their temporal-spatial expression during seed development and upon germination. The present data shows that soy allergens accumulated in both the embryonic axes and cotyledon, but expression patterns differed depending on the specific allergen. Allergens accumulated sooner and to a greater level in cotyledons than in embryonic axes. Gly m Bd 28 began at 14 d after flowering, 7 to 14 d earlier than Gly m Bd 30K and Gly m Bd 60K. Comparatively, their degradation was faster and more profound in embryonic axes than in cotyledons. Gly m Bd 60K began to decline at 36 h after imbibition and remained detectable up to 108 h in cotyledons. In contrast, the Glym Bd 60K protein was reduced at 24 h, and eventually disappeared at 96 h. In cotyledons Gly m Bd 28K first declined at 24 h, then increased from 36 h to 48 h, followed by its large reduction at 72 h after seed germination. These findings provide useful information on soy allergen biosynthesis and will help move forward towards developing a hypoallergenic soybean for safer food.

关键词： allergen food allergy Glycine max soybean synthesis and degradation seed development and germination

Aging precipitation characteristics and tensile properties of Al-Zn-Mg-Cu alloys with different additional Zn contents

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Rare Metals 2021年第8期40卷 2160-2166页

作者： Kai Wen Bai-Qing xiong yong-An Zhang Xi-Wu Li zhi-Hui Li Li-Zhen Yan Hong-Wei Yan Hong-Wei Liu State Key Laboratory of Nonferrous Metals and Processes GRIMAT Engineering Institute Co.LTD.Beijing101407China GRINM Group Co. LTD.Beijing100088China

The increase in zinc content in Al-Zn-Mg-Cu alloys provides an effective method to enhance the *** electron microscopy(TEM)and tensile test were employed to analyze the microstructure and tensile properties,respectively,of Al-9.3 Zn-2.0 Mg-1.8 Cu alloy(9.3 Zn alloy)and Al-9.8 Zn-2.0 Mg-1.8 Cu alloy(9.8 Zn alloy)with single-and double-stage aging *** results showed that the two alloys possessed a closed strength under single-stage peak-aging *** for double-stage aging treatment,9.8 Zn alloy had a higher strength values than 9.3 Zn alloy under the same aging *** the second step aging time prolonging,the strength gap was *** main precipitates for the two alloys with single-stage peak-aging state were GP zones andη’phase,while there were a majority ofη’phases andηphases for the two alloys under typical double-stage over-aging *** double-stage overaging state,the proportion of precipitate with large size for9.3 Zn alloy was larger than that for 9.8 Zn ***,a more obvious trend was revealed for the double-stage overaging *** gap of strength between the two alloys was explained by the difference of precipitation characteristics via interaction mechanism between precipitates and dislocations.

关键词： Zn content Al-Zn-Mg-Cu alloy Precipitation characteristics Tensile properties

Traceability Technology of DC Electric Energy Metering for On-Site Inspection of Chargers

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Energy Engineering 2023年第3期120卷 715-727页

作者： Hua Li Dezhi xiong zhi Wang Hunan Institute of Metrology and Inspection Changsha410018China State Grid Hunan Electric Power Corporation Limited Changsha410001China Hunan Province Key Laboratory of Intelligent Electrical Measurement and Application Technology Changsha410001China

The on-site inspection of high-power DC chargers results in new DC high-current measurement and DC energy traceability system *** paper studies the traceability technology of electric energy value for automotive high-power DC chargers,including:(1)the traceability method of the built-in DC energy meter and shunt of the charger;(2)precision DC high current and small precision DC voltage output and measurement *** paper designs a 0.1 mA∼600 A DC high current measurement system and proposes a 0.005 level DC powermeasurement traceability *** uncertainty evaluation experiment of theDC powermeasurement calibration system and the high-power DC charger’s on-site calibration experiment results verify the method’s effectiveness and feasibility in this *** experimental results show that the combined standard uncertainty of the DC power metering verification system can be 0.0451%.

关键词： DC electric energy measurement charger traceability calibration

Cautiously using natural medicine to treat liver problems

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World Journal of Gastroenterology 2017年第19期23卷 3388-3395页

作者： Fei xiong yong-Song Guan Department of Oncology West China Hospital of Sichuan University

Natural medicine is a system of therapy that administrates natural agents and their derivatives to treat human *** medicine has been used to treat many kinds of human diseases for thousands of *** treatment protocols of natural medicine are integrative in nature,and are required to utilize the most appropriate therapies to address the needs of the individual *** of the relative convenience,safety and efficacy,natural medicine is now increasing *** doctors are licensed in many areas of the world and regulated partly by law in these areas,which is quite different from various other forms of complementary and alternative *** diseases,such as hepatitis,liver cirrhosis and liver carcinoma,are serious health problems *** half of the natural agents used in treatment of liver diseases today are natural products and their *** natural medicine is beneficial and safe,physicians should pay close attention to the potential side-effects of the naturopathic agents,which lead to liver injury,interstitial pneumonia and acute respiratory ***,when administrating naturopathic protocols to patients for the treatment of liver diseases,we should try our best to prevent and avoid as much as possible the negative impact of these *** article highlights the current practice and recommended improvement of natural medicines in the treatment of liver diseases and gives some specific examples to emphasize the prevention and management of adverse reactions of the natural agents and suggests that natural medicine should be cautiously used to treat liver problems.

关键词： Caution Natural medicine Herb Natural nutraceutical Liver disease Adverse reactions

RNA-Seq analysis of yak ovary: improving yak gene structure information and mining reproduction-related genes

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Science China(Life Sciences) 2014年第9期57卷 925-935页

作者： LAN DaoLiang xiong XianRong WEI YanLi XU Tong ZHONG JinCheng zhi XiangDong WANG yong LI Jian Institute of Qinghai-Tibetan Plateau Southwest University for Nationalities College of Life Science and Technology Southwest University for Nationalities Beijing Genomics Institute-Shenzhen

RNA-Seq, a high-throughput （HT） sequencing technique, has been used effectively in large-scale transcriptomic studies, and is particularly useful for improving gene structure information and mining of new genes. In this study, RNA-Seq HT technology was employed to analyze the transcriptome of yak ovary. After lllurrlina-Solexa deep sequencing, 26826516 clean reads with a total of 4828772880 bp were obtained from the ovary library. Alignment analysis showed that 16992 yak genes mapped to the yak genome and 3734 of these genes were involved in alternative splicing. Gene structure refinement analysis showed that 7340 genes that were annotated in the yak genome could be extended at the 5＇ or 3＇ ends based on the alignments been the transcripts and the genome sequence. Novel transcript prediction analysis identified 6321 new transcripts with lengths ranging from 180 to 14884 bp, and 2267 of them were predicted to code proteins. BLAST analysis of the new transcripts showed that 1200-4933 mapped to the non-redundant （nr）, nucleotide （nt） and/or SwissProt sequence databases. Comparative statistical analysis of the new mapped transcripts showed that the majority of them were similar to genes in Bos taurus （41.4%）, Bos grunniens mutus （33.0%）, Ovis aries （6.3%）, Homo sapiens （2.8%）, Mus musculus （1.6%） and other species. Functional analy- sis showed that these expressed genes were involved in various Gene Ontology （GO） categories and Kyoto Encyclopedia of Genes and Genomes pathways. GO analysis of the new transcripts found that the largest proportion of them was associated with reproduction. The results of this study will provide a basis for describing the normal transcriptome map of yak ovary and for future studies on yak breeding performance. Moreover, the results confirmed that RNA-Seq HT technology is highly ad- vantageous in improving gene structure information and mining of new genes, as well as in providing valuable data to expand the yak genome information.

关键词： yak ovary transcriptome RNA-Seq improvement of gene structure reproduction

Dark and multi-dark solitons in the three-component nonlinear Schrodinger equations on the general nonzero background

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Chinese Physics B 2019年第12期28卷 60-67页

作者： zhi-Jin xiong Qing Xu Liming Ling School of Electric Power Engineering South China University of TechnologyGuangzhou 510640China School of Mathematics South China University of TechnologyGuangzhou 510640China

We exhibit some new dark soliton phenomena on the general nonzero background for a defocusing three-component nonlinear Schrodinger equation. As the plane wave background undergoes unitary transformation SU(3), we obtain the general nonzero background and study its modulational instability by the linear stability analysis. On the basis of this background, we study the dynamics of one-dark soliton and two-dark-soliton phenomena, which are different from the dark solitons studied before. Furthermore, we use the numerical method for checking the stability of the one-dark-soliton solution. These results further enrich the content in nonlinear Schrodinger systems, and require more in-depth studies in the future.

关键词： dark soliton three-component nonlinear Schrodinger equations general nonzero background

A tassel-type multilayer flexible probe for invasive neural recording

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Chip 2022年第3期1卷 69-76页

作者： Zi-Peng Ye Jing Qi Yi-Ling Ni zhi-yong Wu Xiao Xiao Shi-Sheng xiong School of Information Science and Technology Fudan UniversityShanghai 200433China Institute of Science and Technology for Brain-Inspired Intelli-gence Fudan UniversityShanghai 200433China

Invasive neural probes are one of the most critical components in the intracortical neural signal recording ***,they can cause brain damage and tissue response during and after ***,neural probes with high flexibility,biocompatibility,and simple implantation methods are required in brain *** we present a novel approach to fabricating a multilayer flexible tassel-type neural probe using low-cost maskless laser direct-write lithog-raphy,combined with straightforward release and assembly methods to prepare a whole implantation *** probe has 32 recording electrodes with an area of 8×8μm^(2),arranged into two rows of different depths and 16 separated shanks,aiming at the neural signal recording in an extensive *** and gold are used as the insulating and conductive layers,*** the help of a polyethylene glycol(PEG)coating,the tassel structure was mechanically enhanced for successful implantation,and our morphology characterization showed that the diameter of the coated probe was less than 50μ*** property tests also proved that it had the necessary stiffness for brain ***,electrochemical tests were carried out,which showed that the probe had a rather low impedance after a simple gold ***,in vivo experiments demonstrated our probe can be successfully used in neural recording.

关键词： Neural probe Tassel-type Micro-fabrication process Mask-less lithography Polyimide

Pairing-Free ID-Based Key-Insulated Signature Scheme

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Journal of Electronic Science and Technology 2015年第1期13卷 33-38页

作者： Guo-Bin Zhu Hu xiong zhi-Guang Qin School of Computer Science and Engineering University of Electronic Science and Technology of China

Without the assumption that the private keys are kept secure perfectly, cryptographic primitives cannot be deployed in the insecure environments where the key leakage is inevitable. In order to reduce the damage caused by the key exposure in the identity-based（ID-based） signature scenarios efficiently, we propose an ID-based key-insulated signature scheme in this paper, which eliminates the expensive bilinear pairing operations. Compared with the previous work, our scheme minimizes the computation cost without any extra cost. Under the discrete logarithm（DL） assumption, a security proof of our scheme in the random oracle model has also been given.

关键词： Identity-based cryptography key-insulated random oracle mode signature