检索结果-南通市图书馆

Apolipoprotein A-i binding protein-mediated neuroprotection in glaucomatous neuroinflammation and neurodegeneration

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第5期20卷 1414-1415页

作者： Sinwoo Hwang Seunghwan Choi Soo-Ho Choi Keun-Young Kim Yury i.Miller Won-Kyu ju Hamilton Glaucoma Center and Shiley Eye institute The Viterbi Family Department of OphthalmologyUniversity of California San DiegoLa JollaCAUSA Department of Medicine University of California San DiegoLa JollaCAUSA National Center for Microscopy and imaging Research Department of NeurosciencesUniversity of California San DiegoLa JollaCAUSA

Glaucoma is a multifactorial eye disorder that can cause vision loss and irreversible blindness,affecting individ uals aged 40 to 80 yea rs *** to the aging population,it is expected that the number of people affected by glaucoma will surpass 111 million by 2040 as the disease becomes more *** primarily contributes to optic nerve axon loss and the progressive degeneration of retinal ganglion cells (RGCs),subsequently leading to vision impairment.

关键词： irreversible pass primarily

EXiSTENCE RESUlTS FOR THE KiRCHHOFF TYPE EQUATiON WiTH A GENERAl NONliNEAR TERM

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Scientia 2022年第5期42卷 2063-2077页

作者： Huirong pi Yong ZENG School of Mathematics and information Guangci UniversityNanning 530004China

This paper is mainly concerned with existence and nonexistence results for solutions to the Kirchhoff type equation−(a+b∫_(R^(3))|∇u|^(2))Δu+V(x)u=f(u)in R^(3),with the general hypotheses on the nonlinearity f being as introduced by Berestycki and *** analysis introduces variational techniques to the analysis of the effect of the nonlinearity,especially for those cases when the concentration-compactness principle cannot be applied in terms of obtaining the compactness of the bounded Palais-Smale sequences and a minimizing problem related to the existence of a ground state on the Pohozaev manifold rather than the Nehari manifold associated with the equation.

关键词： Kirchhoff type equation general nonlinearity variational methods Pohozaev identity

Hillslope soil erosion and runoff model for natural rainfall events

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2008年第3期24卷 277-283页

作者： Zhanyu Zhang Guohua Zhang Changqing Zuo Xiaoyu pi Agricultural Engineering College Hohai UniversityNanjing 210098 China Soil and Water Conservation Research institute of jiangxiProvince Nanchang 330000 China The Water Service Bureau of Chaoyang of Beijing City Beijing 100026 China

By using the momentum theorem and waterbalance principle, basic equations of slope runoff were derived, soil erosion by raindrop splash and runoff were discussed and a model was established for decribing hillslope soil erosion processes. The numerical solution of the model was obtained by adopting the Preissmann format and considering the common solution-determining conditions, from which not only the runoff and soil erosion but also their processes can be described. The model was validated by ten groups of observation data of Soil Conservation Ecological Science and Technology Demonstration Park of jiangxi Province. Comparisons show that the maximum relative error between simulation and experimental data is about 10.98% for total runoff and 15 % for total erosion, 5.2% for runoffprocess and 6.1% for erosion process, indicating that the model is conceptually realistic and reliable and offers a feasible approach for further studies on the soil erosion process.

关键词： Overland flow Raindrop splash Runoff Erosion process Numerical simulation

Rietveld refinement and optical properties of SrWO_4:Eu^(3+) powders prepared by the non-hydrolytic sol-gel method

在线全文

学校读者我要写书评

暂无评论

journal of Rare Earths 2015年第2期33卷 113-128页

作者： P.F.S.Pereira i.C.Nogueira E.longo E.j.Nassar i.l.V.Rosa l.S.Cavalcante Chemistry institute University of the State of Sao Paulo Julio de Mesquita Filho-UNESP Francisco DegniAraraquara-SP 14800-900 Brazil liEC-Chemistry Department Federal University of Sao Carlos Via Washington Luis Km 235Sao Carlos-SP 13565-905 Brazil University of Franca-UNiFRAN Via Dr.Armando Sales de OliveiraNo.201 Franca-SP 14404-600 Brazil CCN-DQ-GERATEC University of the State of Piauí Joao Cabral 2231 P.O.Box 391Terezina PI 64002-150 Brazil

We investigated the effect of annealing time on the structure and optical properties of Sr WO4：Eu^3＋ powders prepared by the non-hydrolytic sol-gel method and heat treated at 800 ℃ for 2,4,8 and 16 *** and differential thermal analyses revealed that Sr WO4：Eu^3＋ powders were obtained at about 800 ℃.X-ray diffraction patterns and Rietveld refinement data confirmed that all powders had a scheelite-type tetragonal ***-Raman and Fourier transform infrared spectra indicated structural order at short range and anti-symmetric stretching vibrations of O-W-O bonds associated with tetrahedral[WO4]*** properties were investigated by ultraviolet-visible（UV-vis）diffuse reflectance,and photoluminescence（Pl）data which provided the evolution of quantum efficiency（η）and lifetime（τ）.UV-vis spectroscopy evidenced intermediate energy levels within the band gap of Sr WO4：Eu^3＋ *** properties validated that the Eu^3＋ electric-dipole（^5D0→^7F2）transition in Pl emission spectra was dominant which proved that Eu^3＋ ions were positioned in a site without an inversion center.[（^5D0→^7F2）/（^5D0→^7F1）]band ratios showed that Eu^3＋ ions were located in a low symmetry *** Pl emission,ηandτproved the dependence on the annealing time in the behavior of Sr WO4：Eu3＋powders with a higher relative emission Pl intensity as well as higherηandτvalues related to other samples when heat treated at 800℃ for 8 h.

关键词： SrWO4 Rietveld refinement optical band gap Eu^(3+) +-rare earth luminescence

Effect of alkaline metal ions on the photoluminescence properties of Eu^(3+)-doped Ca_3Al_2O_6 phosphors

在线全文

学校读者我要写书评

暂无评论

journal of Rare Earths 2016年第12期34卷 1193-1198页

作者： Kyeongsoon Park joon Woo pi Deshmukh Abdul Hakeem Faculty of Nanotechnology and Advanced Materials Engineering Sejong University

Ca3–xAl2O6：x Eu^3＋（0.02≤x≤0.10） and Ca（2.92）Al2O6：0.04Eu^3＋,0.04M^＋（M^＋=li^＋, Na^＋, and K^＋） phosphors were prepared by sol-gel method and their photoluminescence properties were investigated. The crystal structure of the annealed Ca3–xAl2O6：x Eu^3＋ and Ca（2.92）Al2O6：0.04Eu^3＋,0.04M^＋ phosphors was analyzed with X-ray diffraction（XRD）. The size and morphological characteristics of the annealed phosphors were investigated with a field emission scanning electron microscope（FE-SEM）. The photoluminescence properties were evaluated with a spectrofluorometer. The phosphors were effectively excited by the light of 396 nm and showed intense red emission at 616 nm, which originated from the 5D0→7F2 transition of Eu^3＋. Among the prepared phosphors, the Ca（2.96）Al2O6：0.04Eu^3＋ phosphor showed the strongest emission intensity and the highest color purity. The addition of alkaline metal ions（li^＋, Na^＋, and K^＋） to Ca（2.96）Al2O6：0.04Eu^3＋ phosphor degraded the emission intensity and color purity.

关键词： phosphor photoluminescence emission sol-gel method Eu3+ rare earths

Elastic and Thermo-physical Properties of Stannite-type Cu_2ZnSnS_4 and Cu_2ZnSnSe_4 from First-principles Calculations

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English letters) 2013年第3期26卷 285-292页

作者： Xiancong HE jinhong pi Yuming DAi Xiaoquan li Department of Materials Science and Engineering Nanjing Institute of Technology

Cu2ZnSnS4 (CZTS) and Cu2ZnSnSe4 (CZTSe) with optimum band gaps about 1.5 eV are important absorbers for solar cells. The elastic constants and the thermo-physical properties of the stannite-type CZTS and CZTSe are calculated by using density-functional theory (DFT) and the quasi-harmonic Debye model. The bonding strength along the [100] and [010] directions is the same to that along the [001] direction and the shear elastic properties of the {001} plane are anisotropic for CZTS and CZTSe. Both compounds exhibit ductile behavior due to their high ratio of bulk modulus to shear modulus (K/G). The values of thermal capacity are close to 200 j/(mol·K) at above 300 K, and the thermal expansion coefficients decrease with increasing pressure at same temperature. The entropy is variable by power-exponent, and the internal energy is almost linear with increasing temperature for CZTS and CZTSe. The Gibbs energy of CZTS is lower than that of CZTSe under same temperature and pressure. The Debye temperatures are 297 and 232 K, and Grneisen parameters are 2.36 and 2.37 for CZTS and CZTSe at 300 K, respectively.

关键词： Elastic property Thermo-physical property First-principles Cu2ZnSnS4 Cu2ZnSnSe4

A Note on Tropical Triangles in the Plane

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2009年第11期25卷 1775-1786页

作者： M.ANSOla M.j.de la PUENTE Departamento de Algebra Facultad de Matemáticas Universidad Complutense

We define transversal tropical triangles （affine and projective） and characterize them via six inequalities to be satisfied by the coordinates of the vertices. We prove that the vertices of a transversal tropical triangle are tropically independent and they tropically span a classical hexagon whose sides have slopes ∞, 0, 1. Using this classical hexagon, we determine a parameter space for transversal tropical triangles. The coordinates of the vertices of a transversal tropical triangle determine a tropically regular matrix. Triangulations of the tropical plane are obtained.

关键词： tropical triangles tropical triangulation linear inequalities convexity tropical semi-field

An　Oligomer　Approach　to　Geometry　Optimization　for　Two　Dimensional　Periodic　Polymers

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical letters 1996年第9期7卷 859-861页

作者： Guo, HY Wang, P li, j Burke, la BEijiNG UNiV CHEM TECHNOl DEPT APPL CHEMBEIJING 100029PEOPLES R CHINA RUTGERS STATE UNiV DEPT CHEMCAMDENNJ 08102

The oligomer approach used in geometry optimization for two dimensional polymers and crystals has been *** optimization for Planar π-conjugated systems,graphite,with the oligomer approach has been performed at AM1 le... 详细信息

关键词： Optimization Two Dimensional Approach An

Enhanced acetone sensing performance of nanostructured Sm2O3 doped SnO2 thick films

在线全文

学校读者我要写书评

暂无评论

journal of Rare Earths 2017年第8期35卷 813-823页

作者： F.i.Shaikh l.P.Chikhale j.Y.Patil i.S.Mulla S.S.Suryavanshi School of Physical Sciences Solapur University Solapur 413255 (M.S.) lndia Council of Scientific and industrial Research Pashan Pune 411008 India

in the present work, we synthesized Sm2O3 doped SnO2 in order to prepare a selective acetone sensor with fast response, quick recovery and good repeatability. Pure as well as 2 mol.%, 4 mol.%, 6 mol.% and 8 mol.% Sm2O3 doped SnO2 nanostructured samples were synthesized by using a co-precipitation method. The characterization of the samples was done by thermogravimetric and differential thermo-gravimetric analysis（TG-DTA）, X-ray diffraction（XRD）, field emission gun-scanning electron microscopy（FEG-SEM）, energy dispersive analysis by X-rays（EDAX）, high resolution scanning electron microscopy（HR-TEM）, selected area X-ray diffraction（SAED）, Brunauer-Emmet-Teller（BET） and ultraviolet-visible-near infrared（UV-Vis-NiR） spectroscopy techniques. The gas response studies of liquid petroleum gas, ammonia, ethanol and acetone vapor were carried out. The results showed that Sm doping systematically lowered operating temperature and enhanced the gas response and selectivity for acetone. The response and recovery time for 6 mol.% Sm2O3 doped SnO2 thick film at the operating temperature of 250 °C were 15 and 24 s, respectively.

关键词： tin oxide samarium oxide screen printing thick film acetone sensor rare earths