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Clustering properties of partly charged superfine particles in a light medium

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Chinese Chemical Letters 2007年第11期18卷 1419-1422页

作者： Jing sheng Li Juan Wang qin shen School of Chemistry and Chemical Engineering Jiangsu University 301 Xue Fu Road Zhenjiang 212013 China

This paper investigated average cluster sizes （ACS） and cluster size distributions （CSD） at different shear rates by Brownian dynamics in non-, bi-, and uni-polar systems with partly charged superfine particles, The investigation indicates that clusters in non- polar systems are the weakest and easiest to be damaged by increasing shear stresses; charged particles play important and different roles： in bi-polar system, it intends to strengthen clusters to some extent provided that the sign-like ions homogeneously arranged; in uni-polar system charged particles cracked the clusters into smaller ones, but the small clusters are strong to stand with larger shear stress. The relationship between ACS and shear rates follows power law with exponents in a range 0.18-0.28, these values are in a good agreement with experiment range but at the lower limit compared with other systems of non-metallic cluster particles.

关键词： Partly charged particles Average cluster sizes Cluster size distributions

Identity-based encryption with wildcards in the standard model

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The Journal of China Universities of Posts and Telecommunications 2009年第1期16卷 64-68,80页

作者： MING Yang shen Xiao-qin WANG Yu-min School of Information Engineering Chang'an University Xi'an 710064 China ZTE Corporation Xi'an 710065 China State Key Laboratory of Integrated Service Network Xidian University Xi'an 710071 China

In this article, based on Chatterjee-Sarkar＇ hierarchical identity-based encryption （HIBE）, a novel identity-based encryption with wildcards （WIBE） scheme is proposed and is proven secure in the standard model （without random oracle）. The proposed scheme is proven to be secure assuming that the decisional Bilinear Diffie-Hellman （DBDH） problem is hard. Compared with the Wa-WIBE scheme that is secure in the standard model, our scheme has shorter common parameters and ciphertext length.

关键词： encryption identity-based encryption with wildcards bilinear pairing

Certificateless universal designated verifier signature schemes

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The Journal of China Universities of Posts and Telecommunications 2007年第3期14卷 85-90,94页

作者： MING Yang shen Xiao-qin WANG Yu-min State Key Laboratory of Integrated Service Network Xidian UniversityXi'an 710071 China

Universal designated verifier signature schemes allows a signature holder to designate the signature to a desire designated verifier, in such a way that only designated verifier can verify this signature, but is unable to convince anyone else of this fact. The previous constructions of universal designated verifier signature rely on the underlying public key infrastructure, that needs both signers and verifiers to verify the authenticity of the public keys, and hence, the certificates are required. This article presents the first model and construction of the certificateless universal designated verifier signature scheme, in which the certificates are not needed. The proposed scheme satisfies all the requirements of the universal designated verifier signature in the certificateless system. Security proofs are provided for the scheme based on the random oracle model, assuming that the Bilinear diffie-hellman （BDH） problem is hard to solve.

关键词： certificateless cryptography universal designated verifier signature bilinear pairing

MED12 mutations in human diseases

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Protein & Cell 2013年第9期4卷 643-646页

作者： Hua Wang qin shen Li-hua Ye Jun Ye Jiangsu Taizhou People’s Hospital Taizhou 225300China Taizhou Maternal and Children’s Health-Care Center Taizhou 225300China

The Mediator Complex plays key roles in activating gene transcription in *** of RNA polymerase II transcription subunit 12 homolog(MED12)is a subunit of the Mediator Complex and regu-lates the activity of the ***12 is involved in a variety of cellular activities,and mutations in MED12 gene impair MED12 activities and are associated with several diseases,including Opitz-Kaveggia syndrome,Lujan syndrome,uterine leiomyomas and prostate *** review will discuss the bio-logical function of MED12 and the relationship between MED12 mutations and diseases.

关键词： diseases complex. MED1

M@MIL-100（Fe）（M = Au, Pd, Pt） nanocomposites fabricated by a facile photodeposition process： Efficient visible-light photocatalysts for redox reactions in water

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Nano Research 2015年第10期8卷 3237-3249页

作者： Ruowen Liang Fenfen Jing Lijuan shen Na qin Ling Wu StateKeyLaboratoryofPhotocatalysisonEnergyandEnvironment FuzhouUniversityFuzhou350002China

Proper design and preparation of high-performance and stable dual functional photocatalytic materials remains a significant objective of research. In this work, highly dispersed noble-metal nanoparticles （Au, Pd, Pt） were immobilized on MIL-100（Fe）（denoted M@MIL-100（Fe）） using a facile room-temperature photodeposition technique. The resulting M@MIL-100（Fe）（M = Au, Pd, and Pt） nanocomposites exhibited enhanced photoactivities toward photocatalytic degradation of methyl orange （MO） and reduction of heavy-metal Cr（VI） ions under visible-light irradiation （A ≥ 420 nm） compared with blank-MIL-100（Fe）. Combining these results with photoelectrochemical analyses revealed that noble-metal deposition can effectively improve the charge-separation efficiency of MIL-100（Fe） under visible-light irradiation. This phenomenon in turn leads to the enhancement of visible-light-driven photoactivity of M@MIL-100（Fe） toward photocatalytic redox reactions. In particular, the Pt@MIL-100（Fe） with an average Pt particle size of 2 nm exhibited remarkably enhanced photoactivities compared with those of M@MIL-100（Fe）（M = Au and Pd）, which can be attributed to the integrative effect of the enhanced light absorption intensity and more efficient separation of the photogenerated charge carrier. In addition, possible photocatalytic reaction mechanisms are also proposed.

关键词： MIL-100(Fe) photodeposition noble metal redox reactions

NONO Regulates Cortical Neuronal Migration and Postnatal Neuronal Maturation

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Neuroscience Bulletin 2019年第6期35卷 1097-1101页

作者： Xiaoqing Liu Jiangli Zheng Shaojun Qi qin shen Peking-Tsinghua-NIBS Graduate Program School of Life SciencesTsinghua UniversityBeijing 100084China Tongji Hospital Brain and Spinal Cord Innovative Research CenterSchool of Life Sciences and TechnologyFrontier Science Research Center for Stem CellsMinistry of EducationTongji UniversityShanghai 200092China Center for Stem Cell Biology and Regenerative Medicine School of MedicineIDG/McGovem Institute for Brain ResearchTsinghua UniversityBeijing 100084China

Dear Editor,The mammalian cerebral cortex,responsible for all higherorder brain functions,is organized into six layers of neurons that form distinct projections and connections within and outside the *** cortical development,neural progenitor cells(NPCs)in the proliferative ventricular zone(VZ)and subventricular zone(SVZ)of the dorsal telencephalon produce projection neurons that migrate toward the pial surface to form the cortical plate(CP).

关键词： ventricular cortex cerebral

An investigation about learning burnout in medical college students and its influencing factors

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International Journal of Nursing Sciences 2014年第1期1卷 117-120页

作者： Li Ling shen qin Li-fang shen School of Nursing Zhejiang Traditional Chinese Medical UniversityHangzhouChina

Purpose:To investigate the degree of learning burnout and its influencing factors in medical college and university ***:The Learning Burnout Scale,Attributional Style Questionnaire,and Self-Efficacy Scale were used to investigate 679 medical college and university ***:The Learning Burnout Scale score was 61.33*** score for the Attributional Style Questionnaire was 0.191.18,and Self-Efficacy Scale score was 2.46*** and attributional styles were negatively correlated with learning *** of study,scholarship status,grade,and attributional style and self-efficacy total scores affected the degree of learning burnout,and explained 27%of the total variance of observed learning ***:Learning burnout in students is of a moderate *** should help and guide students according to their profession,grade,learning characteristics,and whether they have existing attributional style problems;these interventions should help to reduce learning burnout.

关键词： Learning burnout Questionnaires

Preparation of PMAA-coated Dysprosium Ferrite Ferrofluids and Study on the Superparamagnetism

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Chemical Research in Chinese Universities 2002年第1期18卷 30-33页

作者： ZHU Chuan-zheng shen qin HU Xian-luo ZHANG Jie ZHAO Hong Department of Chemistry East China Normal UniversityShanghai 200062P.R.China

The present paper covers the unprecedented preparation of stable aqueous Dy-ferrite ferrofluids, whereby colloidal Dy_ δ Fe_ 3- δ O_4 ultrafine particles were dispersed by using polymeric surfactant PMAA. The stabilities of the series of the ferrofluids were studied according to the stability indexes. The susceptibility measurements were made with a Farady-type magnetic balance at various temperatures and magnetic field intensities. In terms of Langevin function, the σ versus H/T curves showed that Dy-ferrite ferrofluids exhibited superparamagnetism behavior and the blocking temperatures were in the range from 160 to 200 K. Moreover, the ferrofluids were characterized by means of Infra-red spectroscopy, transmission electron microscopy, X-ray diffraction, and Mssbauer spectroscopy.

关键词： Dy-ferrite ferrofluid Susceptibility Superparamagnetism Stability PMAA

Mechanical properties of hot-pressed high-entropy diboride-based ceramics

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Journal of Advanced Ceramics 2020年第4期9卷 503-510页

作者： Ji-Xuan Liu Xiao-qin shen Yue Wu Fei Li Yongcheng Liang Guo-Jun Zhang State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringCollege of SciencesInstitute of Functional MaterialsDonghua UniversityShanghai201620China

High-entropy ceramics attract more and more attention in recent ***,mechanical properties especially strength and fracture toughness for high-entropy ceramics and their composites have not been comprehensively *** this work,high-entropy(Ti0.2Zr0.2Hf0.2Nb0.2Ta 0.2)B2(HEB)monolithic and its composite containing 20 vol%SiC(HEB–20SiC)are prepared by hot *** addition of SiC not only accelerates the densification process but also refines the microstructure of HEB,resulting in improved mechanical *** obtained dense HEB and HEB–20SiC ceramics hot pressed at 1800℃exhibit four-point flexural strength of 339±17 MPa and 447±45 MPa,and fracture toughness of 3.81±0.40 MPa·m1/2 and 4.85±0.33 MPa·m1/2 measured by single-edge notched beam(SENB)*** deflection and branching by SiC particles is considered to be the main toughening mechanisms for the HEB–20SiC *** hardness Hv0.2 of the sintered HEB and HEB–20SiC ceramics is 23.7±0.7 GPa and 24.8±1.2 GPa,*** the increase of indentation load,the hardness of the sintered ceramics decreases rapidly until the load reaches about 49 N,due to the indentation size *** on the current experimental investigation it can be seen that the room temperature bending strength and fracture toughness of the high-entropy diboride ceramics are within ranges commonly observed in structure ceramics.

关键词： high-entropy ceramics high-entropy diboride flexural strength fracture toughness indentation size effect