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A New Form of Boussineq Equation with Improved Linear Dispersion Characteristics

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China Ocean Engineering 1999年第1期14卷 11-20页

作者： zhang, yg Li, YC Dalian Naval Acad Dept Navigat Dalian 116018 Peoples R China Dalian Univ Technol Natl Key Lab Coastal & Offshore Engn Dalian 116023 Peoples R China

It has been shown that Boussinesq type equations, which include the lowest order effects of nonlinearity and frequency dispersion, can provide an accurate description of wave evolution in coastal regions. But different linear dispersion characteristics of the equation can be obtained by different integrating method. In this paper, a new form of the Boussinesq equation is derived by use of two different layer horizontal velocity variables instead of the commonly used depth-averaged velocity or an arbitrary layer velocity. This significantly improves the linear dispersion properties of the Boussinesq equation and enables it to be applied to a wider range of water depth.

关键词： Boussinesq equation Airy wave Pade approximation numerical simulation irregular wave

A NEW. NEO-CLERODANE DITERPENE FROM AJUGA NIPPONENSIS

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Chinese Chemical Letters 1995年第7期6卷 581-582页

作者： Liu, Z Li, ZQ zhang, CX Chen, RY zhang, yg Qiu, YT Zhao, SH Nankai Univ Inst Elementoorgan Chem Tianjin 300071 Peoples R China S China Agr Univ Dept Plant Protect Lab Insect Toxicol Guangzhou 510642 Peoples R China

This paper describes the structural elucidation of a new insecticiaal neoclerodane diterpene Ajagamarin L-2 from Ajuga nipponensis,based on spectral data and X-ray diffraction analysis as 4,18-epoxy-6 alpha -hydroxy-1... 详细信息

关键词： NEO-CLERODANE DITERPENE FROM AJUGA NIPPONENSIS A NEW

应用多元回归分析影响全膝关节置换术后膝关节活动度的相关因素

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中国组织工程研究与临床康复 2007年第47期11卷 9462-9465页

作者：张银光王岩柴伟解放军总医院骨科北京市100853

目的:全膝关节置换手术后患者的满意度很大程度上取决于膝关节疼痛的缓解程度以及关节的最大活动度。对87例接受全膝关节表面置换患者进行客观效果评定并分析影响术后膝关节活动度的相关因素。方法:①对象和材料:选择2005-06/2007-05解... 详细信息

目的:全膝关节置换手术后患者的满意度很大程度上取决于膝关节疼痛的缓解程度以及关节的最大活动度。对87例接受全膝关节表面置换患者进行客观效果评定并分析影响术后膝关节活动度的相关因素。方法:①对象和材料:选择2005-06/2007-05解放军总医院骨科手术的全膝关节置换患者87例102膝。其中男8例9膝,女79例93膝,年龄46-78岁,平均67.3岁。TACK假体和GeminiII假体51个(Link公司)、LPS后稳定型膝假体17个(Zimmer公司)、后叉保留型及后稳定型膝假体23个(Stryker公司)、后叉保留型假体11个(北京京航公司)。②干预和评估:患者均行全膝关节置换术。采用美国纽约特种外科医院的膝关节评分标准(HSS)对膝关节进行疗效评价;使用多元回归方法对可能影响术后膝关节活动度的因素(包括年龄、体质量指数、屈曲挛缩、内外翻畸形、术前的活动度、出院时的活动度、术前的膝关节HSS评分)进行分析。结果:所有患者均获得1年以上的随访。①膝关节HSS评分:平均为87.5分。优良率90.8%,较术前明显改善(P<0.01)。②多元回归分析:显示出院时患者膝关节的活动度同术后1年的膝关节活动度有关(P<0.01)。③随访结果:所有患者都未发生深部感染、假体松动或骨溶解等远期不良的生物相容性反应。结论:出院时患者膝关节的活动度同术后1年的膝关节活动度有关。术后早期功能训练,有利于最大限度地提高置换术后全膝关节活动度。

关键词：关节成形术置换膝回归分析组织构建

骨髓间质干细胞异位移植在椎间盘内的迁移及外源基因的表达

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中国组织工程研究与临床康复 2007年第7期11卷 1263-1266页

作者：王金堂张宏张银刚张小卫李萌西安交通大学医学院第一附属医院骨科陕西省西安市710061

目的:观察骨髓间质干细胞异位移植在椎间盘内的存活、迁移情况及外源基因的表达。方法:实验于2001-10/2003-07在西安交通大学环境与疾病相关基因教育部重点实验室完成。选取新西兰大白兔32只,每只兔子的椎间盘均被随机分为4个区组,即正... 详细信息

目的:观察骨髓间质干细胞异位移植在椎间盘内的存活、迁移情况及外源基因的表达。方法:实验于2001-10/2003-07在西安交通大学环境与疾病相关基因教育部重点实验室完成。选取新西兰大白兔32只,每只兔子的椎间盘均被随机分为4个区组,即正常对照组(L2～3)、生理盐水组(L3～4)、绿色荧光蛋白细胞移植组(L4～5)及BMP-绿色荧光蛋白细胞移植组(L5～6)。分别进行髓核注射,正常对照组不注射;生理盐水组注射20μL生理盐水;绿色荧光蛋白细胞移植组注射20μL林格氏液包含1×105的含绿色荧光蛋白的骨髓间质干细胞;BMP-绿色荧光蛋白细胞移植组注射20μL林格氏液包含1×105的含BMP-绿色荧光蛋白的骨髓间质干细胞。术后1,3,6个月取材,荧光显微镜观察髓核组织内绿色荧光强度;DNA-PCR分析新霉素抗性基因的DNA拷贝数。结果:32只白兔全部进入结果分析,无脱失。①术后不同时间点各组髓核组织内绿色荧光强度比较:绿色荧光蛋白细胞移植组及BMP-绿色荧光蛋白细胞移植组髓核组织内可观察到荧光的存在,随时间的增加,荧光变得比较分散。两组荧光的分布和强度并没有明显的差别。②各组髓核组织内新霉素抗性基因表达水平比较:绿色荧光蛋白细胞移植组及BMP-绿色荧光蛋白细胞移植组术后1,3,6个月组间及组内比较,差异均无显著性意义(P>0.05)。结论:移植的骨髓间质干细胞能够在髓核内存活、迁移,外源基因可以在髓核内表达,提示基于骨髓间质干细胞移植的治疗策略是防治椎间盘退变的潜在有效方法。

关键词：于细胞移植间质干细胞骨髓细胞椎间盘基因疗法

Preparation of silver nanoparticles through the reduction of straw-extracted lignin and its antibacterial hydrogel

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 504-514页

作者： Lou zhang Shuo Li Fu Tang Jingkai zhang Yuetong Kang Hean zhang Lidong Li State Key Laboratory for Advanced Metals and Materials School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China

Silver nanoparticles(Ag NPs)have attracted attention in the field of biomaterials due to their excellent antibacterial ***,the reducing and stabilizing agents used for the chemical reduction of Ag NPs are usually toxic and may cause water *** this work,Ag NPs(31.2 nm in diameter)were prepared using the extract of straw,an agricultural waste,as the reducing and stabilizing *** analysis revealed that the straw extract contained lignin,the structure of which possesses phenolic hydroxyl and methoxy groups that facilitate the reduction of silver salts into Ag *** surfaces of Ag NPs were negatively charged due to the encapsulation of a thin layer of lignin molecules that prevented their *** the prepared Ag NPs were added to the precursor solution of acrylamide,free radical polymerization was triggered without the need for extra heating or light irradiation,resulting in the rapid formation of an Ag NP-polyacrylamide composite *** inhibition zone test proved that the composite hydrogel possessed excellent antibacterial ability due to the presence of Ag *** prepared hydrogel may have potential applications in the fabrication of biomedical materials,such as antibacterial dressings.

关键词： silver nanoparticles hydrogel straw extraction antibacterial

Depression mechanism of sulfite ions on sphalerite and Pb^(2+)activated sphalerite in the flotation separation of galena from sphalerite

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 335-345页

作者： Feng zhang Chenyang zhang Linlin Wu Wei Sun Hongliang zhang Jianhua Chen Yong Pei Songjiang Li Engineering Research Center of Ministry of Education for Carbon Emission Reduction in Metal Resource Exploitation and Utilization Hunan International Joint Research Center for Efficient and Clean Utilization of Critical Metal Mineral ResourcesSchool of Minerals Processing and BioengineeringCentral South UniversityChangsha 410083China State Key Laboratory of Mineral Processing Beijing General Research Institute of Mining&MetallurgyBeijing 100160China Hunan Provincial Key Laboratory of Micro&Nano Materials Interfaces Science College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083China School of Resources Environment and MaterialsGuangxi UniversityNanning 530004China Department of Chemistry Xiangtan UniversityXiangtan 411105China China Railway Resource Group Co.Ltd Beijing 102300China

The depression mechanism of sulfite ions on sphalerite and Pb^(2+)activated sphalerite in the flotation separation of galena from sphalerite still lacked in-depth ***,the depression mechanism of sulfite ions on sphalerite and Pb^(2+)activated sphalerite in the flotation separation of galena from sphalerite was further systematically investigated with experiments and density functional theory(DFT)*** X-ray photoelectric spectroscopy(XPS)results,DFT calculation results,and frontier molecular orbital analysis indicated that sulfite ions were difficult to be adsorbed on sphalerite surface,suggesting that sulfite ions achieved depression effects on sphalerite through other non-adsorption ***,the oxygen content in the surface of sphalerite treated with sulfite ions in creased,which enhanced the hydrophilicity of the sphalerite and further increased the difference in hydrophilicity between sphalerite and ***,sulfite ions were chelated with lead ions to form PbSO_(3)in *** hydrophilic PbSO_(3)was more easily adsorbed on sphalerite than *** interaction between sulfite ions and lead ions could effectively inhibit the activation of *** addition the UV spectrum showed that after adding sulfite ions,the peak of perxanthate in the sphalerite treated xanthate solution was significantly stronger than that in the galena with xanthate solution,indicating that xanthate interacted more readily with sulfite ions and oxygen mo lecules within the sphalerite system,leading to the formation of ***,sulfite ions hardly depressed the flotation of ga lena and could promote the flotation of galena to some *** study deepened the understanding of the depression mechanism o sulfite ions on sphalerite and Pb^(2+)activated sphalerite.

关键词： sphalerite galena sulfite ion density functional theory depression mechanism

Glucocorticoid receptor signaling in the brain and its involvement in cognitive function

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Neural Regeneration Research 2025年第9期20卷 2520-2537页

作者： Chonglin Su Taiqi Huang Meiyu zhang Yanyu zhang Yan Zeng Xingxing Chen Brain Science and Advanced Technology Institute Hubei Province Key Laboratory of Occupational Hazard Identification and ControlSchool of MedicineWuhan University of Science and TechnologyWuhanHubei ProvinceChina

The hypothalamic-pituitary-adrenal axis regulates the secretion of glucoco rticoids in response to environmental *** the brain,a nuclear receptor transcription fa ctor,the glucocorticoid recepto r,is an important component of the hypothalamicpituitary-a d renal axis's negative feedback loop and plays a key role in regulating cognitive equilibrium and *** glucoco rticoid receptor influences cognitive processes,including glutamate neurotransmission,calcium signaling,and the activation of brain-derived neurotrophic factor-mediated pathways,through a combination of genomic and non-genomic *** interactions within the central nervous system can alter the expression and activity of the glucocorticoid receptor,there by affecting the hypothalamic-pituitary-a d renal axis and stress-related cognitive *** appropriate level of glucocorticoid receptor expression can improve cognitive function,while excessive glucocorticoid receptors or long-term exposure to glucoco rticoids may lead to cognitive *** with cognitive impairment-associated diseases,such as Alzheimer's disease,aging,depression,Parkinson's disease,Huntington's disease,stroke,and addiction,often present with dysregulation of the hypothalamic-pituitary-adrenal axis and glucocorticoid receptor *** review provides a comprehensive overview of the functions of the glucoco rticoid receptor in the hypothalamic-pituitary-a d renal axis and cognitive *** emphasizes that appropriate glucocorticoid receptor signaling fa cilitates learning and memory,while its dysregulation can lead to cognitive *** provides clues about how glucocorticoid receptor signaling can be targeted to ove rcome cognitive disability-related disorders.

关键词： brain-derived neurotrophic factor calcium signaling glucocorticoid receptor glucocorticoid glutamate transmission hypothalamic-pituitary-adrenal axis long-term potentiation neurocognitive disorders neuroplasticity stress

From waste to wealth:Coal tar residue derived carbon materials as low-cost anodes for potassium-ion batteries

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 464-475页

作者： Zhonghua Lu Jun Shen Xin zhang Lingcong Chao Liang Chen Ding zhang Tao Wei Shoudong Xu College of Chemical Engineering and Technology Taiyuan University of TechnologyTaiyuan 030024China College of Chemistry Taiyuan University of TechnologyTaiyuan 030024China School of Chemical Engineering and Pharmacy Wuhan Institute of TechnologyWuhan 430205China School of Energy and Power Jiangsu University of Science and TechnologyZhenjiang 212003China

Carbon materials are widely recognized as highly promising electrode materials for various energy storage system *** tar residues(CTR),as a type of carbon-rich solid waste with high value-added utilization,are crucially important for the development of a more sustainable *** this study,we employed a straightforward direct carbonization method within the temperature range of 700-1000℃to convert the worthless solid waste CTR into economically valuable carbon materials as anodes for potassium-ion batteries(PIBs).The effect of carbonization temperature on the microstructure and the potassium ions storage properties of CTR-derived carbons(CTRCs)were systematically explored by structural and morphological characterization,alongside electrochemical performances *** on the co-regulation between the turbine layers,crystal structure,pore structure,functional groups,and electrical conductivity of CTR-derived carbon carbonized at 900℃(CTRC-900H),the electrode material with high reversible capacity of 265.6m Ah·g^(-1)at 50 m A·g^(-1),a desirable cycling stability with 93.8%capacity retention even after 100 cycles,and the remarkable rate performance for PIBs were ***,cyclic voltammetry(CV)at different scan rates and galvanostatic intermittent titration technique(GITT)have been employed to explore the potassium ions storage mechanism and electrochemical kinetics of *** indicate that the electrode behavior is predominantly governed by surface-induced capacitive processes,particularly under high current densities,with the potassium storage mechanism characterized by an“adsorption-weak intercalation”*** work highlights the potential of CTR-based carbon as a promising electrode material category suitable for high-performance PIBs electrodes,while also provides valuable insights into the new avenues for the high value-added utilization of CTR.

关键词： coal tar residue carbon materials anode potassium-ion batteries high value-added

Effects of carbon content on the microstructure and tensile properties of a low-density steel

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 391-401页

作者： Yongxuan Shang Mingyu Fan Shuyong Jiang Zhongwu zhang Key Laboratory of Superlight Materials and Surface Technology Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001China State Key Laboratory of Metal Material for Marine Equipment and Application Iron&Steel Research Institute of Ansteel Group CorporationAnshan 114009China

Carbon can change the phase components of low-density steels and influence the mechanical *** this study,a new method to control the carbon content and avoid the formation ofδ-ferrite by decarburization treatment was *** microstructural changes and mechanical characteristics with carbon content induced by decarburization were systematically ***-Jaoul(C-J)analysis was employed to examine the work hardening characteristics during the tensile *** decarburization by heat treatments,the carbon content within the austenite phase decreased,while Mn and Al were almost unchanged;this made the steel with full austenite transform into the austenite and ferrite dual ***,(Ti,V)C carbides existed in both matrix phase and the mole fraction almost the *** addition,the formation of other carbides *** loss induced a decrease in strength due to the weakening of the carbon solid *** the steel with the single austinite,the deformation mode of austenite was the dislocation planar glide,resulting in the formation of *** the dual-phase steel,the deformation occurred by the dislocation planar glide of austenite first,with the increase in strain,the cross slip of ferrite took place,forming dislocation cells in *** the late stage of deformation,the work hardening of austinite increased rapidly,while that of ferrite increased slightly.

关键词： low-density steels carbon content decarburization strengthening mechanisms work hardening behavior