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Comparison of Structure and Properties among Various PAN Fibers for Carbon Fibers

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Journal of Materials Science & Technology 2005年第3期21卷 376-380页

作者： Dongxin HE, Chengguo WANG, Yujun BAI and Bo zhu College of Materials Science and Engineering, Shandong University, jinan 250061, China College of Materials Science and Engineering Shandong University Jinan 250061 China

To find out the high-quality polyacrylonitrile (PAN) fibers, some differences are sought by comparing domestic PAN fibers with the foreign ones. X-ray diffractometer (XRD), transmission electron microscope (TEM), Fourier transform infrared (FT-IR) spectrometer, elemental analyzer, tensile-testing machine and high-temperature differential scanning calorimeter (DSC) are used to characterize the individual microstructure, chemical structure, elemental content, mechanical properties and thermal properties. It is found that high-quality PAN fibers have high density, lower titre, higher or adequate tensile strength, and they also have better conglomeration structure, smaller crystal dimension with dispersive distribution, less microvoids and flaws.

关键词： Polyacrylonitrile (PAN) fiber Carbon fiber Structure Properties

Cryodamage to plasma membrane integrity in head and tail regions of human sperm

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Asian Journal of Andrology 2000年第2期2卷 135-138页

作者： Wei-Jie zhu Xue-Gao LIU Center for Reproductive Immunology Research, jinan University, Guangzhou 510632, China Center for Reproductive Immunology Research Jinan University Guangzhou China

Aim: To investigate the effect of cryopreservation on the plasma membrane integrity in the head and tail regions ofindividual sperm, and the relationship between intact cryopreserved sperm and its motility and zona-free hamster oocytepenetration rate. Methods: The eosin Y exclusion and the hypoosmotic swelling tests were combined to form a sin-gle test (HOS-EY test) to identify the spermatozoa with four types of membrane integrity. Results: After cryop-reservation, there was a marked decline in the percentage of spermatozoa with Type Ⅳ membrane integrity (head mem-brane intact/tail membrane intact), and a significant increase in those with Type Ⅰ (head membrane damaged/tail mem-brane damaged) and Type Ⅲ (head membrane damaged/tail membrane intact) membrane integrity (n = 50, P 0.05). Conclusion: (1) The HOS-EY test has the advan-tage of showing four patterns of membrane integrity in individual spermatozoon; (2) Cryopreservation causes a signifi-cant membrane rupture in the head and tail regions of spermatozoa; Type Ⅲ is the main transitional state of membranecryodamage; (3) Cryodamage to head and tail membrane may occur independently; the presence of an intact tail mem-brane does not necessarily indicate the intacmess of head membrane. (4) Intact membranes are closely related to post-thaw motility, but do not reflect the fertilizing potential.

关键词： spermatozoa cryopreservation cell membrane supravital staining hypoosmotic swelling test

Proteomic analysis of urinary exosomes reveals ferroptosis-associated proteins are involved in diabetic nephropathy

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Genes & Diseases 2024年第5期11卷 6-8页

作者： Kaida Mu Yanping Yang Xiaofei An Jie zhu Jing Zhang Yanfei Jiang Xiaorong Yang jinan Zhang Department of Endocrinology and Metabolism Shanghai University of Medicine&Health Sciences Affiliated Zhoupu HospitalShanghai 201318China Department of Endocrinology Affiliated Hospital of Nanjing University of Chinese MedicineNanjingJiangsu 210029China

Diabetic nephropathy(DN)is one of the major microvascular complications of diabetes mellitus and a major cause of end-stage renal disease(ESRD).The pathogenesis of DN is unknown,but it is closely related to disorders of glucolipid metabolism,abnormal hemodynamics,chronic inflammatory response,oxidative stress,and *** DN develops into ESRD,it is often more difficult to treat than ESRD caused by other kidney ***,a deeper knowledge of the pathophysiological mechanisms of DN and the discovery of candidate markers for early diagnosis are *** secreted by renal cells can regulate a series of pathophysiological processes such as translation and transcription by releasing miRNAs or proteins,thereby regulating the biological functions and phenotype of recipient kidney *** has been found that miRNA secreted by urinary exosomes in patients with DN is involved in the occurrence and development of DN and may become biological markers.1 However,studies on exosome proteins are relatively few and lack validation in *** the present study,we identified an altered pathway in urinary exosomes from DN patients for the first ***,the altered ferroptosis-related proteins may represent novel candidate markers for early progression of disease and/or early treatment effects.

关键词： urinary metabolism diagnosis

Fluorescence　Enhancement　of　Samarium－Thenoyl－trifluoroacetone－Cetyltrimethylammonium　Bromide－Triton　X－100　by　Scandium

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维普期刊数据库

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Chemical Research in Chinese Universities 1995年第1期11卷 16-21页

作者： zhu Gui-yun LIU Ping SI Zhi-kun and HU Jing-tian(Department of Chemistry , Shandong University , jinan , 250100) SHANDONG UNIV DEPT CHEMJINAN 250100PEOPLES R CHINA

fluorescence enhancement phenomenon shown by adding scandium ion to thesamarium-thenoyltrifluoroacetone (TTA)-cetyltrimethylammonium bromide(CTMAB)-Triton X-100(TX-100) system was observed and the effect of the condi-tions on the system was studied in detail. The excitation and emission wavelengthswere 370 nm, 565 nm, 603 nm and 645 nm, respectively. The optimum conditionsforming Sm-Sc-TTA-CTMAB-TX-100 system were that the concentration of Sc￣(3+)was equal to 5.0× 10￣(-5) mol/L, pH was 7. 7. Under these conditions, the fluores-cence intensity can be increased about 10 times higher than that of the system con-taining no Sc￣(3+) , and it was a linear function of the concentration of samariumn therange of 1. 0 × 10￣(-9)-4. 0 × 10￣(-7) mol/L. The detection limit was 6. 0 ×10￣(-10) mol/*** system was used for the spectrofluorimetric determination of samarium withsatisfactory results. The nature of enhanced fluorescence was explained using in-tramolecular and intermolecular energy transfer theory.

关键词： Fluorimetry Samarium Scandium Fluorescence enhancement

Reduced mesencephalic astrocyte-derived neurotrophic factor expression by mutant androgen receptor contributes to neurodegeneration in a model of spinal and bulbar muscular atrophy pathology

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Neural Regeneration Research 2025年第9期20卷 2655-2666页

作者： Yiyang Qin Wenzhen zhu Tingting Guo Yiran Zhang Tingting Xing Peng Yin Shihua Li Xiao-Jiang Li Su Yang Guangdong Key Laboratory of Non-human Primate Research Key Laboratory of CNS Regeneration(Ministry of Education)Guangdong–HongKong–Macao Institute of CNS RegenerationJinan UniversityGuangzhouGuangdong ProvinceChina

Spinal and bulbar muscular atrophy is a neurodegenerative disease caused by extended CAG trinucleotide repeats in the androgen receptor gene,which encodes a ligand-dependent transcription facto *** mutant androgen receptor protein,characterized by polyglutamine expansion,is prone to misfolding and forms aggregates in both the nucleus and cytoplasm in the brain in spinal and bulbar muscular atrophy *** aggregates alter protein-protein interactions and compromise transcriptional *** this study,we reported that in both cultured N2a cells and mouse brain,mutant androgen receptor with polyglutamine expansion causes reduced expression of mesencephalic astrocyte-de rived neurotrophic *** n of mesencephalic astrocyte-derived neurotrophic factor amelio rated the neurotoxicity of mutant androgen receptor through the inhibition of mutant androgen receptor *** down endogenous mesencephalic astrocyte-derived neurotrophic factor in the mouse brain exacerbated neuronal damage and mutant androgen receptor *** findings suggest that inhibition of mesencephalic astrocyte-derived neurotrophic factor expression by mutant androgen receptor is a potential mechanism underlying neurodegeneration in spinal and bulbar muscular atrophy.

关键词： androgen receptor mesencephalic astrocyte-derived neurotrophic factor mouse model neurodegeneration neuronal loss neurotrophic factor polyglutamine disease protein misfolding spinal and bulbar muscular atrophy transcription factor

THE　COLUMINESCENCE　EFFECT　OF　RARE　EARTH　COMPLEXES　IN　LANGMUIR－BLODGETT　FILMS

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Chinese Chemical Letters 1996年第3期7卷 273-274页

作者： Guo Lun ZHONG Ren Jie ZHANG Kong Zhang YANG and Gui Yun zhu (Institute of Colloid and Intertace Chemistry, Shandong University, jinan, 250100)(Department of Chemistry, Shandong University. jinan, 250100) SHANDONG UNIV INST COLLOID & INTERFACE CHEMJINAN 250100PEOPLES R CHINA SHANDONG UNIV DEPT CHEMJINAN 250100PEOPLES R CHINA

The mixed multilayers of xEu(TTA)3Phen+(1-x)Gd(TTA)3phen (x=0.5%, 0.3% or0.1%, in molar percentage) / Arachidic Acid = 1/1 (in molar ratio) were fabricated by LBtechnique. The columinescence effect of rare earth complex was observed and studied bydetecting the fluoresene emission intensity of europium in the LB films.

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Sensitized Luminescence of Rare Earths

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Chemical Research in Chinese Universities 1996年第1期12卷 10-15页

作者： SI Zhi-kun HU Jing-tian JIANG Wei and zhu Gui-yun(Department of Chemistry, Shandong University, jinan, 250100)LI Shu-hua(Department of Basic Courses, Shandong Institute of Light Industry, jinan, 250100) SHANDONG UNIV DEPT CHEMJINAN 250100PEOPLES R CHINA SHANDONG INST LIGHT IND DEPT BASIC COURSESJINAN 250100PEOPLES R CHINA

The enhancement effect on the fluorescence intensities of an Eu3+ (or/and Sm3+ )-thenoyltrifluoroacetone (TTA )-dibenzo-18-crown-6 (18-C-6 ) system and Eu 3+ (or /and Sm3+ ) -benzoyltrifluoroacetone (BTA )-cetyltrimethylammonium bromide (CTMAB) system by dysprosium has been studied. In the presence of enhancing ions, the fluorescence intensities of the above systems were enhanced by a factor of about 40-150, respectively. The above systems were used for the determination of europlum or/and samarium in rare earths oxides and gave satisfactory results.

关键词： Sensitized luminescence Rare earths Fluorescence

Review of precipitation strengthening in ultrahigh-strength martensitic steel

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 256-269页

作者： Zhihao Tian Chunlei Shang Chaolei Zhang Xiaoye Zhou Honghui Wu Shuize Wang Guilin Wu Junheng Gao Jiaming zhu Xinping Mao Institute for Carbon Neutrality University of Science and Technology BeijingBeijing 100083China Institute of Steel Sustainable Technology Liaoning Academy of MaterialsShenyang 110004China Department of Materials Science and Engineering Shenzhen MSU-BIT UniversityShenzhen 518172China Institute of Materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004China School of Civil Engineering Shandong UniversityJinan 250061China

Martensite is an important microstructure in ultrahigh-strength steels,and enhancing the strength of martensitic steels often involves the introduction of precipitated phases within the martensitic *** considerable research efforts devoted to this area,a systematic summary of these advancements is *** review focuses on the precipitates prevalent in ultrahigh-strength martensitic steel,primarily carbides(e.g.,MC,M_(2)C,and M_(3)C)and intermetallic compounds(e.g.,Ni Al,Ni_(3)X,and Fe_(2)Mo).The precipitation-strengthening effect of these precipitates on ultrahigh-strength martensitic steel is discussed from the aspects of heat treatment processes,microstructure of precipitate-strengthened martensite matrix,and mechanical ***,a perspective on the development of precipitation-strengthened martensitic steel is presented to contribute to the advancement of ultrahigh-strength martensitic *** review highlights significant findings,ongoing challenges,and opportunities in the development of ultrahigh-strength martensitic steel.

关键词： ultrahigh-strength martensitic steel precipitation strengthening mechanical property carbide intermetallic compound

A NEW METHOD IN GROUNDWATER FLOW MODELING

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Journal of Hydrodynamics 2009年第2期21卷 245-254页

作者： MA Xiu-yuan LI Shu-guang zhu Wei-shen School of Civil Engineering Shandong University Jinan 250061 China Department of Civil and Environmental Engineering Michigan State University East Lansing Michigan 48834USA

One of the challenges in groundwater modeling is the prediction of hydraulic head related to local stress fluctuations with a regional scale model. Typical applications of numerical models require extensive field information for input data and for calibration If we can model the change directly, we may not have to know all the modeling parameters because sometimes the changes only depend on fewer parameters. In this article, we present an improved methodology for groundwater modeling related to local stress fluctuations using a perturbation approach. Our results demonstrate that this approach is capable of matching an exact solution for drawdown in both confined and unconfined aquifers. The results suggest that this perturbation method can provide an accurate representation of head in a large-scale hydrogeological system.

关键词： groundwater modeling local stress fluctuations perturbation method iteration scheme