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Structural Evolution of LLDPE-LMW/HMW Blend during Uniaxial Deformation as Revealed by In Situ Synchrotron Radiation X-ray Scattering

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Chinese Journal of Polymer Science 2021年第1期39卷 102-112,I0007页

作者： Pin-Zhang Chen Hao-Yuan Zhao Zhi-Jie Xia Qian-Lei Zhang dao-Liang Wang Ling-Pu Meng Wei Chen National Synchrotron Radiation Laboratory Anhui Provincial Engineering Laboratory of Advanced Functional Polymer FilmCAS Key Laboratory of Soft Matter ChemistryUniversity of Science and Technology of ChinaHefei 230029China

the structural evolutions of LLDPE-LMW/HMW blend during uniaxial deformation at temperatures of 80 and 120 ℃ were investigated by the in situ synchrotron radiation small-and wide-angle X-ray scattering(SR-SAXS/WAXS). the magic sandwich echo(MSE) sequence was used to detect a virtually dead-time-free induction decay(FID) for solid-state NMR analysis. the thermal property of the blend was first checked by DSC,and the temperature dependence of the overall crystallinity was obtained by MSE-FID. the onset melting temperature is determined to be 116 ℃(DSC), and the enhanced π-flip motions in the crystalline domains are clearly observed at t>60 ℃ by MSE-FID. For deformation at 80 ℃, the lamellae become staggered in the strain-softening region as shown by the four-point SAXS pattern, whereas further deformation leads to the melting-recrystallization in the strain-hardening region. For deformation at 120 ℃, the six-point SR-SAXS signal appears just after the four-point SR-SAXS signal, which indicates the formation of new lamellae along deformation direction. In addition, no phase transition occurs in the whole deformation process at both temperatures. Current work shows the detailed temperature dependence microstructural evolution of LLDPELMW/HMW blend. this is expected to provide more structural information for correlating microscopic structure with macroscopic mechanical performance.

关键词： Polyethylene In situ SAXS/WAXS NMR Microstructural evolution

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On the well-posedness for stochastic fourth-order Schrdinger equations

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Applied Mathematics(A Journal of Chinese Universities) 2011年第3期26卷 307-318页

作者： FANG dao-yuan ZHANG Lin-zi ZHANG ting Department of Mathematics Zhejiang University Hangzhou 310027 China.

the influence of the random perturbations on the fourth-order nonlinear SchrSdinger equations,iut＋△^2u＋ε△u＋λ｜u｜^p-1u=ξ,（t,x）∈R^＋×R^n,n≥1,ε∈{-1,0,＋1},is investigated in this paper. the local well-posedness in the energy space H^2（R^n） are proved for p 〉n＋4/n＋2,and p≤2^#-1 if n≥*** existence is also derived for either defocusing or focusing L^2-subcritical nonlinearities.

关键词： Stochastic fourth-order Schrodinger equation well-posedness global existence

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Protein Extraction Methods for two-Dimensional Electrophoresis from Baphicacanthus cusia(Nees)Bremek Leaves-A Medicinal Plant with High Contents of Interfering Compounds

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Agricultural Sciences in China 2010年第10期9卷 1530-1537页

作者： XIANG Xiao-liang NING Shu-ju JIANG Xia GONG Xiao-gui ZHU Ren-lei WEI dao-zhi School of Life Sciences Fujian Agriculture and Forestry University Fuzhou 350002 P.R. China School of Crop Sciences Fujian Agriculture and Forestry University Fuzhou 350002 P.R. China College of Chemistry and Materials Science Fujian Normal University Fuzhou 350002 P.R. China

Protein extraction is a critical step for two-dimensional electrophoresis （2-DE）. Different plant samples require different and adaptive protein extraction protocols. the leaves of medicinal plant, Baphicacanthus cusia （Nees） Bremek are notoriously recalcitrant to common protein extraction methods due to high levels of interfering compounds （especially the secondary metabolites and pigments）. this study was aimed to establish a routine procedure for the proteomic analysis ofB. cusia leaves, and a new protocol for the protein extraction was developed by optimizing trichloroacetic acid （tCA）/ acetone extraction method. the efficiency of this protocol was demonstrated by comparison with 3 published protein extraction methods （chloroform/acetone, Mg/NP-40, tris-base/acetone）. the results showed that the optimized tCA/ acetone precipitation extraction method gave a relatively high protein yield （9.263 mg g^-1 fresh weight）, high-resolution separation, clear protein profiles, the highest proteins spots （1 31 t protein spots）, and displayed less contamination in 2- DE gels. therefore, the results suggested that the optimized tCA/acetone method was the most effective among the 4 methods for B. cusia leaves.

关键词： Baphicacanthus cusia (Nees) Bremek medicinal plant protein extraction two-dimensional electrophoresis

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Structure and magnetic properties of the S=3/2 zigzag spin chain antiferromagnet BaCote_(2)O_(7)

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Science China(Physics,Mechanics & Astronomy) 2021年第8期64卷 91-97页

作者： Lisi Li Xunwu Hu Zengjia Liu Jia Yu Benyuan Cheng Sihao Deng Lunhua He Kun Cao dao-Xin Yao Meng Wang Center for Neutron Science and technology School of PhysicsSun Yat-sen UniversityGuangzhou 510275China Shanghai Institute of Laser Plasma Shanghai 201800China Center for High Pressure Science and technology Advanced Research Shanghai 201203China Spallation Neutron Source Science Center Dongguan 523803China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China

We report a study of the structure and magnetic properties of the S=3/2 zigzag spin chain compound BaCote_(2)O_(7).Neutron diffraction measurements show that it crystallizes in the noncentrosymmetric space group Ama2 with a canted↑↑↓↓spin structure along the quasi-one-dimensional zigzag chain and a moment size of 1.89(2)μBat 2 *** magnetic susceptibility and specific heat measurements yield an antiferromagnetic phase transition at tN=6.2 K.A negative Curie-Weiss temperature,ΘCW=-74.7(2) K,and an empirical frustration parameter,f=|ΘCW|/tN≈12,are obtained by fitting the magnetic susceptibility,indicating antiferromagnetic interactions and strong magnetic *** ultraviolet-visible absorption spectroscopy and first-principles calculations,an indirect band gap of 2.68(2) eV is *** propose that the canted zigzag spin chain of BaCote_(2)O_(7) may produce a change in the polarization via the exchange-striction mechanism.

关键词： antiferromagnet zigzag spin chain magnetic frustration spin structure

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Magnetic field annealing of FeCo-based amorphous alloys to enhance thermal stability and Curie temperature

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Rare Metals 2023年第6期42卷 2000-2006页

作者： Zai-dao Li Wei-Wei Zhang Ge-tian Li Song-Song Li Hong-Sheng Ding tao Zhang Yu-Jun Song Center for Modern Physics technology Department of Applied PhysicsBeijing Key Laboratory for Magneto-Photoelectrical Composite and Interface ScienceUniversity of Science and Technology BeijingBeijing100083China School of Materials Science and Engineering Beihang UniversityBeijing100191China

Annealing temperatures and applied magnetic fields are two important parameters for the performance modification of magnetic *** article investigated the effect of different annealing temperatures on crystallization condition,magnetic properties and thermal stability of the amorphous magnetic alloy Co_(36)Fe_(36)Si_(4.8)B1_(9.2)Nb_(4)(at%).Results indicate that the annealing temperature can significantly affect the size and content of precipitated nanocrystals in the amorphous alloy,and the precipitation of nanocrystalline phases can result in the distinct change of magnetic properties and Curie *** the annealing was performed at 595 ℃ for 30 min under an applied transverse external magnetic field of 9550.0A·m^(-1),the amorphous alloy shows excellent soft magnetic properties with the saturation magnetization of alloy reaching 110.00 mA·m^(2)·g^(-1),the residual magnetic induction intensity of 4 × 10^(-6) t and the coercivity as low as57.3 A·m^(-1).Furthermore,the Curie temperature of the field-annealed samples can reach up to 440 0C,approximately 58℃ higher than that of the as-quenched species.

关键词： Soft magnetic alloys Amorphous alloy Field annealing

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Synthesis, Crystal Structure and Luminescence of a trinuclear Magnesium Coordination Polymer Based on a triangle Flexible Carboxylic Ligand

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Chinese Journal of Structural Chemistry 2015年第8期34卷 1288-1294页

作者： WANG Rong-Ming ZHANG Ming-Hui LIU Xiao-Qing LIU Xiao-Bin WANG Wen SUN dao-Feng College of Science China University of Petroleum (East China)

A novel two-dimensional metal organic coordination compound based on flexible 1,3,5-tri（4-carboxyphenoxy）benzene （HatCPB）, {[Mgl.5（tCPB）（DMF）（H20）]＇（DMF）}n （1）, has been prepared and structurally characterized by single-crystal X-ray diffraction, tGA, and PXRD measurements. Complex 1 crystalizes in triclinic, space group Pi with a = 10.2521（6）, b = 11.0974（7）, c = 16.1113（9） A, C33H31Mg1.5N2012, Mr = 684.06, V= 1669.46（17） A3, Z = 2, Dc = 1.361 g·cm^-3, p = 0.129 mm^-1, F（000） = 714, 3.06≤0≤25°, λ（MoKa） = 0.71073 A, t= 273（2） K, the final R = 0.0386, wR = 0.0892 and S = 1.031. X-ray diffraction analysis reveals that complex 1 possesses a two-dimensional framework constructed by trinuclear Mg SBUs and three-connected tCPB3- linker. In addition, the solid state luminescent property of complex 1 was also investigated at room temperature.

关键词： crystal structure, two-dimensional framework, fluorescence, magnesium

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重叠复用原理下加性白高斯噪声信道的容量

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北京邮电大学学报 2016年第6期39卷 1-10页

作者：李道本北京邮电大学信息与通信工程学院北京100876

为建立超大容量通信系统提供全新的理论依据,证明了在高斯白噪声干扰环境下,当信道传输函数H(f)的单边带宽限定为B时,仙侬仅利用时间域间隔为1/2B的独立样点荷载信息是不够的,还应该根据重叠复用原理,同时使用频率域间隔为B/K独立样点... 详细信息

为建立超大容量通信系统提供全新的理论依据,证明了在高斯白噪声干扰环境下,当信道传输函数H(f)的单边带宽限定为B时,仙侬仅利用时间域间隔为1/2B的独立样点荷载信息是不够的,还应该根据重叠复用原理,同时使用频率域间隔为B/K独立样点的重叠频域复用技术,使系统容量与K成正比.由于带宽为B信道冲击响应的持续时间t趋近于无穷,频率域独立样点间隔1/t为0,K不受限制;同理,当信道冲激响应函数h(t)的持续时间限定为t时,像正交频分复用那样仅利用频率域间隔为1/t的独立样点去荷载信息是不够的,还应该根据重叠复用原理,用时间域间隔为t/K独立样点的重叠时域复用技术,使系统容量与K成正比.由于冲击响应持续时间为t信道的带宽B趋近于无穷,时间域独立样点间隔1/2B为0,所以K不受限制.此外,还证明了重叠复用的实质是建立超大容量的独立并联高斯信道.

关键词：重叠复用原理独立并联高斯信道重叠时域复用技术重叠频域复用技术重叠X域复用技术信道容量

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Favipiravir and its potentials in COVID-19 pandemic:An update

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Asian Pacific Journal of tropical Medicine 2021年第10期14卷 433-455页

作者： dao Ngoc Hien tam Ahmad t Qarawi Mai Ngoc Luu Morgan turnage Linh tran Gehad Mohamed tawfik Le Huu Nhat Minh Nguyen tien Huy tatsuo Iiyama Kyoshi Kita Kenji Hirayama Online Research Club School of Tropical Medicine and Global HealthNagasaki UniversityNagasaki 852-8523Japan Asia Shine trading&Service CO.LtD. Ho Chi Minh City 700000Vietnam Essen Healthcare BronxNew York 10461 USA Department of Internal Medicine University of Medicine and Pharmacy at Ho Chi Minh CityHo Chi Minh City 700000Vietnam American University of the Caribbean CupecoySint Maarten Institute of Fundamental and Applied Sciences Duy Tan UniversityHo Chi Minh City 700000Vietnam Faculty of Natural Sciences Duy Tan UniversityDa Nang City 550000Vietnam Department of Otorhinolaryngology Faculty of MedicineAin Shams UniversityCairoEgypt Methodist Hospital MerrillvilleIndianaUnited States School of tropical Medicine and Global Health Nagasaki University1-12-4 SakamotoNagasaki 852-8523Japan Department of International trials Center of Clinical SciencesNational Center for Global Health and Medicine(NCGM)TokyoJapan

the COVID-19 pandemic has caused millions of deaths and hundreds of millions of confirmed infections *** pandemic has prompted researchers to produce medications or vaccines to reduce or stop the progression and spread of this disease.A variety of previously licensed and marketed medications are being tested for the treatment and recurrence of SARS-CoV2,including favipiravir(Avigan).Favipiravir was recognized as an influenza antiviral drug in Japan in 2014,and has been known to have a potential in vitro activity against SARS-CoV-2,in addition to its broad therapeutic safety *** was recently approved and officially used in many countries *** review provides insights and up-to-date knowledge of the current role of favipiravir in the treatment of COVID-19 infection,focusing on preclinical and ongoing clinical trials,evidence of its efficacy against SARS-CoV-2 in COVID-19,side effects,anti-viral mechanism,and the pharmacokinetic properties of the drug in the treatment of *** to its teratogenic effects,favipiravir cannot be offered to expectant or pregnant *** practical efficacy of such an intervention regimen will depend on its dose,treatment duration,and cost as well as difficulties in application.

关键词： Favipiravir Avigan COVID-19 SARS-CoV-2 Antiviral Review Efficacy

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Effect of 1,25-Dihydroxyvitamin D_3 on Regulatory t Cells in Ovariectomized Mice

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Biomedical and Environmental Sciences 2014年第10期27卷 779-785页

作者： LIU Jun Chen ZHOU Chen Hui ZHANG Xue CHEN Yan XU Bi Lian CUI Liao XU dao Hua Department of Pharmacology Guangdong Medical College the Second Affiliated Hospital (Jiande Branch) School of Medicine ZheJiang University Institution of traditional Chinese Medicine and New Pharmacy Development Guangdong Medical College

Objective to investigate the correlation between regulatory t （treg） cells and postmenopausal osteoporosis and the antiosteoporotic effect of 1,25-dihydroxyvitamin D3 [1,25（OH）2D3] in relation to treg cells. Methods Fifty female BALB/c mice were randomly divided into five groups： the basal control （BAS）, Sham, ovariectomy （OVX）, OVX＋diethylstilbestrol （OVX＋DES）, and OVX＋I,2S（OH）2D3. tibias were harvested and processed with decalcification for quantitative bone histomorphometry. Femurs were stained by immunohistochemistry to detect Foxp3 protein expression. Spleens were used to detect treg and Foxp3 gene expression by flow cy：ometry and quantitative Rt-PCR, respectively. Results In comparison with the Sham group, a significant decrease was found in the OV~ group in such indices as trabecular bone volume/tc,tal tissue area （BV/tV）, trabecular number （tb.N） and trabecular thickness （***）. 1,25（OH）2D3 and DES partly prevented the decrease in BV/tV, tb.N, *** in OVX mice. treg cell number, Foxp3 mRI~：A expression in spleen and Foxp3 protein expression in femur significantly decreased in the OVX-tr^ated group compared with those in the sham group. 1,25（OH）2D3 and DES significantly increased treg cell number and Foxp3 expression. treg cells and Foxp3 gene expression were related to bone histomorphometric parameters. Conclusion the decrease in treg cell numbers is relevant to the postmenopausal osteoporosis. the antiosteoporosis of 1,25（OH）2D3 is related to regulatory t cells.

关键词： 1,25-dihydroxyvitamin D31 Osteoporosis Regulatory t cells Ovariectomy

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thank God it's Friday!

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中国周刊 2004年第5期 38-39页

作者： Cha dao

two weeks ago, Ma Ling asked her friends what was a good place to have chat after work in *** half of them told her that she should try a restaurant called t.G.I. Friday’s, which is on the third Ring

关键词： thank God it’s Friday

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