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Formation Mechanism of NiAl/TiB_2 Nanocomposite by Mechanical Alloying Elemental Powders

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Journal of Materials Science & Technology 1998年第6期14卷 491-496页

作者： Lanzhang zhou and jianting GUO(Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China) Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

A NiAl/TiB2 nanocomposite is synthesized by mechanical alloying elemental powders. Upon milling for a certain time, an abrupt exothermic reaction occurs and a large amount of NiAl and TiB2 compounds form simultaneously. It is suggested that two separate chemical reactions,i.e. Ni+Al →NiAl and Ti+2B→TiB2, are involved during the exothermic reaction. Additionof Ti and B to Ni-Al system impedes the structural evolution of Ni and Al powders and delays the abrupt reaction. The final products are equilibrium phases without any metastable phases formed. This type of reaction is suggested to be suitable for alloy systems with two large heatrelease reactions.

关键词： NiAl TiB Formation Mechanism of NiAl/TiB2 Nanocomposite by Mechanical Alloying Elemental Powders

Development of a Nickel-base Cast Superalloy with High Strength and Superior Creep Properties

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Journal of Materials Science & Technology 2005年第3期21卷 347-352页

作者： Jieshan HOU, jianting GUO, Lanzhang zhou and Zhijun LI Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

Derived from Russian alloy CHS88U, six experimental Ni-base alloys named as A to F in the Ni-Cr-Co-W-Ti-Al-Hf system are designed, evaluated and processed. One of these alloys, F, shows excellent high temperature tensile strength and ductility with superior creep rupture properties. As predicted by using modeling tools such as PHACOM and NEW PHACOMP, there is hardly the tendency for formation of topologically close-packed phase (TCP) phase in alloy F. Furthermore, through microstructural observation, it is also found that no TCP phase is formed in alloy F after long-time exposure at high temperature. So alloy F has well balance of phase stability and mechanical properties in view of application for gas turbines. It is proved that d-electron approach can be applied for design and development of nickel-base superalloys for gas turbine application.

关键词： Conventional Ni-base superalloy Tensile strength Creep life PHACOMP

An artificial chromosome for data storage

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National Science Review 2021年第5期8卷 67-75页

作者： Weigang Chen Mingzhe Han jianting zhou Qi Ge Panpan Wang Xinchen Zhang Siyu Zhu Lifu Song Yingjin Yuan School of Microelectronics Tianjin University Frontier Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering(Ministry of Education) Tianjin University Syn Bio Research Platform Collaborative Innovation Center of Chemical Science and Engineering (Tianjin)School of Chemical Engineering and TechnologyTianjin University

DNA digital storage provides an alternative for information storage with high density and long-term ***, we report the de novo design and synthesis of an artificial chromosome that encodes two pictures and a video clip. The encoding paradigm utilizing the superposition of sparsified error correction codewords and pseudo-random sequences tolerates base insertions/deletions and is well suited to error-prone nanopore sequencing for data retrieval. The entire 254 kb sequence was 95.27% occupied by encoded *** Transformation-Associated Recombination method was used in the construction of this chromosome from DNA fragments and necessary autonomous replication sequences. The stability was demonstrated by transmitting the data-carrying chromosome to the 100 th generation. This study demonstrates a data storage method using encoded artificial chromosomes via in vivo assembly for write-once and stable replication for multiple retrievals, similar to a compact disc, with potential in economically massive data distribution.

关键词： DNA storage synthetic biology indel correction encoded DNA artificial chromosome

Synthesis and assembly of full-length cyanophage A-4L genome

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Synthetic and Systems Biotechnology 2023年第1期8卷 121-128页

作者： Ting Zhang Bonan Xu Jia Feng Pingbo Ge Guorui Li Jiabao Zhang jianting zhou Jianlan Jiang School of Chemical Engineering and Technology Tianjin UniversityTianjin300072China Key Laboratory of Systems Bioengineering(Ministry of Education) Tianjin UniversityTianjin300072China Frontier Science Center for Synthetic Biology(Ministry of Education) Tianjin UniversityTianjin300072China

Artificial cyanophages are considered to be an effective biological method to control harmful cyanobacterial ***,no synthetic cyanophage genome has been constructed and where its obstacles are ***,we survey a stretch of 16 kb length sequence of cyanophage A-4L that is unclonable in Escherichia *** test 12 predicted promoters of cyanophage A-4L which were verified all active in ***,we screen for eight ORFs that hindered the assembly of intermediate DNA fragments in *** and describe that seven ORFs in the 16 kb sequence could not be separately cloned in *** of unclonable ORFs in high-copy-number plasmid were successfully cloned using low-copy-number vector,suggesting that these ORFs were *** propose a clone strategy abandoned the promotor and the start codon that could be applied for unclonable ***,we de novo synthesized and assembled the full-length genome of cyanophage *** work deepens the understanding of synthetic cyanophages studies.

关键词： Genome assembly Cyanophage A-4L Toxic ORFs screening

Preliminary Investigation of NiAl-TiB_2 Composite Prepared by Reaction Milling

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Journal of Materials Science & Technology 1999年第5期15卷 427-430页

作者： Lanzhang zhou and jianting GUO(Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China To whom correspondence should be addressedE-mail: lzz@imr. ac .cn ) Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

Reaction-milled NiAl-TiB2 composite was fabricated by mechanical alloying elemental powders and hot pressing. TiB2 particles are distributed mostly in grain boundaries of the matrix. The compressive strain to failure of the composite at RT is about twice that of cast NiAl. The compressive yield stress at high temperatures is about 4.5 times higher than that of extruded NiAl, and is also much stronger than XD NiAl-TiB2 composites. Deformation behavior between 1000~1100℃ with different strain rates has been investigated

关键词： TiB NiAl Preliminary Investigation of NiAl-TiB2 Composite Prepared by Reaction Milling

Exogenous artificial DNA forms chromatin structure with active transcription in yeast

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Science China(Life Sciences) 2022年第5期65卷 851-860页

作者： jianting zhou Chao Zhang Ran Wei Mingzhe Han Songduo Wang Kaiguang Yang Lihua Zhang Weigang Chen Mingzhang Wen Cheng Li Wei Tao Ying-Jin Yuan Frontier Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering(Ministry of Education) Tianjin UniversityTianjin 300072China SynBio Research Platform Collaborative Innovation Center of Chemical Science and Engineering(Tianjin)School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China The MOE Key Laboratory of Cell Proliferation and Differentiation School of Life SciencesPeking UniversityBeijing 100871China CAS Key Laboratory of Separation Science for Analytical Chemistry National Chromatographic R.&A.CenterDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China University of Chinese Academy of Sciences Beijing 100049China School of Microelectronics Tianjin UniversityTianjin 300072China

Yeast artificial chromosomes(YACs) are important tools for sequencing,gene cloning,and transferring large quantities of genetic ***,the structure and activity of YAC chromatin,as well as the unintended impacts of introducing foreign DNA sequences on DNA-associated biochemical events,have not been widely ***,we showed that abundant genetic elements like TATA box and transcription factor-binding motifs occurred unintentionally in a previously reported datacarrying chromosome(d Chr).In addition,we used state-of-the-art sequencing technologies to comprehensively profile the genetic,epigenetic,transcriptional,and proteomic characteristics of the exogenous d *** found that the data-carrying DNA formed active chromatin with high chromatin accessibility and H3K4 tri-methylation *** d Chr also displayed highly pervasive transcriptional ability and transcribed hundreds of noncoding *** results demonstrated that exogenous artificial chromosomes formed chromatin structures and did not remain as naked or loose plasmids.A better understanding of the YAC chromatin nature will improve our ability to design better data-storage chromosomes.

关键词： yeast artificial chromosome DNA storage epigenetics chromatin accessibility histone H3K4 tri-methylation

Pregnancy-Induced Changes in Ocular Biomechanics Are Related to Maternal Hormone Levels in Healthy Chinese Pregnant Women

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International Journal of Clinical Medicine 2023年第11期14卷 457-471页

作者： jianting zhou Fangyuan Chen Xiaojuan He Xiaoxue Han Qing zhou Department of Ophthalmology Guangzhou Red Cross Hospital (Guangzhou Red Cross Hospital of Jinan University) Guangzhou China Department of Ophthalmology The First Affiliated Hospital of Jinan University Guangzhou China Department of Obstetrics and Gynecology The First Affiliated Hospital of Jinan University Guangzhou China

Background: To explore the changes in ocular biomechanics during pregnancy and the postpartum period and their association with maternal hormone level changes. Methods: In a prospective cohort study, 24 eyes of 12 pregnant women were enrolled and monitored throughout pregnancy and after delivery (6 weeks). Intraocular pressure (IOP), central corneal thickness (CCT), corneal endothelium cell (CEC), axial length (AL), corneal curvature (K1, K2), anterior chamber depth (ACD), central subfield thickness (CST), macular volume (MV), cube average thickness (CAT), retinal nerve fibre layer (RNFL), tear meniscus height (TMH), and breaking up time (BUT) were measured throughout pregnancy, and blood plasma levels of maternal hormones were determined at the same time points. Results: A gradual decrease in IOP values was observed as gestation progressed, and there was a statistically significant difference in IOP between the 3rd trimester and the 1st and 2nd trimester and postpartum (p = 0.002, p = 0.006, p = 0.050). There was a significant difference between the 1st and 2nd trimesters in terms of MV (p = 0.023). The difference in RNFL in the 3rd trimester and postpartum was significant (p = 0.011). The levels of the β-hCG showed a significant correlation with K2, ACD, and TMH only in the 2nd trimester (r = 0.588, p = 0.045;r = - 0.740, p = 0.006;r = 0.642, p = 0.024). Regarding luteinizing hormone, there was a negative correlation with MV in the 1st and 2nd trimesters (r = - 0.598, p = 0.040;r = - 0.672, p = 0.017) and CAT in the 1st and 2nd trimesters (r = - 0.599, p = 0.040;r = - 0.655, p = 0.021). Luteinizing hormone levels were correlated with ACD (r = - 0.702, p = 0.011) in the 2nd trimester and K2 (r = 0.585, p = 0.046) in the 3rd trimester. A correlation was found between follicle-stimulating hormone levels and CEC, MV and CAT in the 1st trimester (r = - 0.677, p = 0.016;r = - 0.602, p = 0.039;r = - 0.584, p = 0.046) and AL in the 3rd trimester (r = - 0.618, p = 0.032).

关键词： Pregnancy Hormones Ocular Biomechanics Hormone-Related Differences

Positron Lifetime Study of the Single-Phase B2 Ni_(100-x)Al_x and Ni_(50-x)Co_xAl_(50) Intermetallics

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Journal of Materials Science & Technology 2000年第4期16卷 379-382页

作者： Rongshi CHEN, jianting GUO and Wenlong zhou (Department of Superalloys, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China) Liangyue XIONG (International Center for Materials Physics, and Liaoning Key Laboratory for Materials Department of Superalloys Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China Liaoning Key Laboratory for Materials and Hydrogen Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

In order to understand the point defect structure in NiAl Intermetallic compound, the positron lifetime in binary Ni_(100-x)Al_x (53≥x≥45) and ternary B2 Ni_(50-x)Co_xAl_(50) (x=0, 5, 10, 15) intermetallic compounds as a function of composition were measured. It is shown that the positron lifetime spectra of these compounds can be consistently expressed by single-component lifetimes. The positron lifetime value in ternary Ni_(50-x)Co_xAl_(50) alloy is independent of Co content and equal to that detected in both stoichiometric and Al-rich NiAl. From an analysis of the present results, it is suggested that the constant lifetime ofт≈180 ps should be ascribed to saturation trapping and annihilation of positron exclusively at Ni vacancy, no evidence for the presence of Al vacancy is available.

关键词： x)Co_xAl Intermetallics x)Al_x and Ni

A Facile Synthesis of Cerium Phosphate Nanofiber by Solution-solid Method

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Journal of Materials Science & Technology 2010年第1期26卷 45-48页

作者： Mingyun Guan, Jianhua Sun,Tongming Shang, Quanfa zhou,jianting Han and Aiqin Ji Jiangsu Key Laboratory of Precious Metals Chemistry, School of Chemistry and Engineering, Jiangsu Teachers University of Technology, Changzhou 213001, China Jiangsu Key Laboratory of Precious Metals Chemistry School of Chemistry and Engineering Jiangsu Teachers University of Technology Changzhou 213001 China

A solution-solid method is developed to construct cerium phosphate （CePO4） nanofibers. Tetraphosphoric acid formed the condensed linear polyphosphate （PnO3n＋1）^（n＋2）- before reacting with cerium carbonate （Ce2（CO3）3） powder, which was favourable for one dimensional CePO4 nanofibers forming. The growth mechanism was proposed based on solution-solid process. CePOa nanofibers display strong UV luminescence emission and weak blue emission.

关键词： Cerium phosphate Nanofiber Nanostructure Solution-solid method