检索结果-南通市图书馆

A generic procedure for determining atomic LS spectral terms and their LS eigenfunctions

在线全文

学校读者我要写书评

暂无评论

chinese Physics B 2009年第2期18卷 542-548页

作者：熊庄 bacalis n c AMS Research center Southeast University Theoretical and Physical chemistry Institute National Hellenic Research Foundation

This paper develops a Fortran.c.de which is capable to construct the simplest LS eigenfunctions for desired symmetry and determine all permitted atomic LS spectral terms under a given orbital occupancy by implementing and extending the Schaefer and Harris method. Examples （in some cases the most complete set to date） of multiple spectroscopic terms of LS coupling of atomic states for both non-equivalent and equivalent electron.c.configurations are given. It also corrects a few observed errors from the recent literature.

关键词： LS coupling multiples spectroscopic term

Radiative decay from doubly to singly excited states of He via generalization of Laguerre-type orbitals： A non-orthogonal formalism

在线全文

学校读者我要写书评

暂无评论

chinese Physics B 2007年第2期16卷 374-381页

作者：熊庄 bacalis n c AMS Research center Southeast Uniwrsity Nanjing 210096 China Theoretical and Physical chemistry Institute National Hellenic Research Foundation Vaslleos Constantinou 48 Athens 11635 Greece

By taking full account of the non-orthogonality of the orbitals between the low-lying doubly excited states ^1po and the singly excited states ^1S^e and ^1D^e of He, the corresponding radiative decay rates have been investigated theoretically via analytic generalized Laguerre-type atomic orbitals at a nearly numerical multi-conflguration self-consistent field accuracy in a general non-orthogonal configuration interaction scheme. From these rates, we calculate the VUV photon emission and metastable atom spectra, and both are found to be in good qualitative agreement with recent excellent measurements. We obtain, successfully, the enhancement of the VUV photon spectrum, experimentally observed at the energy of （2s4p-4s2p）/（2p,3d） ^1po as compared with other nearby lying states. The mechanism proposed by Odling-Smee et al is verified, implying that taking appropriate account of the overlap existing between orbitals of the low-lying doubly excited and singly excited states （especially important for the compact orbitals） can reveal basic physical dominant mechanism and is crucial in understanding these spectra.

关键词： doubly excited states, singly excited states analytic basis functions, non-orthogonality formalism

Analytic variationally optimized internally orthogonalized modified Laguerre orbitals in accurate atomic configuration interaction.c.lculation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

chinese Physics B 2006年第5期15卷 992-997页

作者：熊庄 bacalis n c AMS Research center Southeast University Nanjing 210096 China Theoretical and Physical chemistry Institute National Hellenic Research Foundation Vasileos Constantinou 48 Athens Greece 11635

An analytic configuration interaction method based on variationally optimized internally orthogonalized modified Laguerre orbitals is presented. We have developed the corresponding computer code. For application, we study the 1s2s ^1S isoelectron.c.sequence from helium to neon, and compare with other methods. By taking into account the Eekart upper-bound theorem, we obtained more accurate and more intuitively understandable results than Hartree-Fock and multi-configuration Hartree-Fock reported results.

关键词： atomic excited states analytic basis function configuration interaction variational computation

STUDY On THE PROPERTIES OF BLEnD OF nATURAL RUBBER LATEX/METHYL METHAcRYLATE GRAFTED RUBBER LATEX BY GAMMA RADIATIOn

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

chinese Journal of Polymer Science 2007年第5期25卷 519-523页

作者： n.c. Dafader M.E. Haque F. Akhtar n.c.ear and Radiation.c.emistry Division Institute of Nuclear Science ＆ Technology Bangladesh Atomic Energy Commission P. O. Box 3787 Dhaka Bangladesh

natural rubber latex （nRL） and methyl methacrylate （MMA） grafted rubber latex were blended in different ratios and irradiated at various absorbed doses by gamma rays from co-60 source at room temperature. The tensile properties, swelling ratio and permanent set were measured. The maximum tensile strength and modulus at 500% elongation were obtained at an absorbed dose of 8 kGy. Modulus increases from 6.99 MPa to 9.87 MPa for an increase in proportion of MMA grafted rubber from 40% to 60% in the blend at similar absorbed dose. Elongation at break and swelling ratio decrease with increasing absorbed dose as well as the MMA grafted rubber content in the blends. The decreasing trend of permanent set is high up to 5 kGy absorbed dose, and beyond that dose, it becomes almost flat.

关键词： natural rubber latex MMA grafted rubber latex Blend rubber Irradiation cross-link.

Silk-based nerve guidance conduits with macroscopic holes modulate the vascularization of regenerating rat sciatic nerve

在线全文

学校读者我要写书评

暂无评论

neural Regeneration Research 2025年第6期20卷 1789-1800页

作者： carina Hromada Patrick Heimel Markus Kerbl LászlóGál Sylvia nürnberger Barbara Schaedl James Ferguson n.c.le Swiadek Xavier Monforte Johannes c.Heinzel Antal nógrádi Andreas H.Teuschl-Woller David Hercher Department Life Science Engineering University of Applied Sciences Technikum WienViennaAustria Austrian.c.uster for Tissue Regeneration ViennaAustria Ludwig Boltzmann Institute for Traumatology The Research Center in Cooperation with AUVAViennaAustria University clin.c.of Dentistry Medical University of ViennaViennaAustria Department of Plastic Reconstructive and Aesthetic SurgeryLandesklinikum Wiener Neustadt2700 Wiener NeustadtAustria Department of Anatomy Histology and EmbryologyAlbert Szent-Györgyi Medical SchoolUniversity of SzegedSzegedHungary Medical University of Vienna Department of Orthopedics and Trauma SurgeryDevision of Trauma SurgeryViennaAustria Department of Hand- PlasticReconstructive and Burn SurgeryBG Unfallklinik TuebingenUniversity of TuebingenTuebingenGermany

Peripheral nerve injuries induce a severe motor and sensory deficit. Since the availability of autologous nerve transplants for nerve repair is very limited, alternative treatment strategies are sought, including the use of tubular nerve guidance conduits(tn.c.). However, the use of tn.c. results in poor functional recovery and central n.c.osis of the regenerating tissue, which limits their application to short nerve lesion defects(typically shorter than 3 cm). Given the importance of vascularization in nerve regeneration, we hypothesized that enabling the growth of blood vessels from the surrounding tissue into the regenerating nerve within the tn.c.would help eliminate n.c.otic processes and lead to improved regeneration. In this study, we reported the application of macroscopic holes into the tubular walls of silk-based tn.c. and compared the various features of these improved silk^(+) tn.c. with the tubes without holes(silk^(–) tn.c.) and autologous nerve transplants in an 8-mm sciatic nerve defect in rats. Using a combination of micro-computed tomography and histological analyses, we were able to prove that the use of silk^(+) tn.c. induced the growth of blood vessels from the adjacent tissue to the intraluminal neovascular formation. A significantly higher number of blood vessels in the silk^(+) group was found compared with autologous nerve transplants and silk^(–), accompanied by improved axon regeneration at the distal coaptation point compared with the silk^(–) tn.c. at 7 weeks postoperatively. In the 15-mm(critical size) sciatic nerve defect model, we again observed a distinct ingrowth of blood vessels through the tubular walls of silk^(+) tn.c., but without improved functional recovery at 12 weeks postoperatively. Our data proves that macroporous tn.c. increase the vascular supply of regenerating nerves and facilitate improved axonal regeneration in a short-defect model but not in a critical-size defect model. This study suggests that further optimizatio

关键词： axon regeneration blood vessel functional recovery macroporous nerve lesion peripheral nerve repair sciatic nerve silk-based nerve guidance conduit vascularization

基于改进变分法对原子激发态精确波函数的研究

在线全文

学校读者我要写书评

暂无评论

物理学报 2014年第5期63卷 113-123页

作者：熊庄汪振新 naoum c.bacalis 东南大学空间科学与技术研究院南京210096 东南大学能源热转换及其过程测控教育部重点实验室南京210096 Theoretical and Physical chemistry Institute National Hellenic Research FoundationVasileos Constantinou 48GR-116 35 AthensGreece

传统的利用变分原理求解Schrfidinger方程获得原子激发态波函数的方法是基于HUM理论(HylleraasUndheim and MacDonald theorem),在有限的n维Hilbert空间中,通过求解久期方程的高阶根获得激发态的近似波函数.在我们前期的工作中已指出,由... 详细信息

传统的利用变分原理求解Schrfidinger方程获得原子激发态波函数的方法是基于HUM理论(HylleraasUndheim and MacDonald theorem),在有限的n维Hilbert空间中,通过求解久期方程的高阶根获得激发态的近似波函数.在我们前期的工作中已指出,由于HUM方法的几个内禀缺陷限制,它将导致在相同的函数空间中,由传统变分法得到的激发态波函数的‘质量’远差于足够好的基态波函数.进一步地,为了避免基于HUM方法的变分缺陷,本文提出了新的变分函数,并证明其试探激发态波函数在其本征态处具有局域极小值,因而可以通过变分极小无限制的逼近该本征态.在此基础上,利用广义的Laguerre类型轨道(GLTO)在组态相互作用的框架下,分别编写了基于传统HUM理论和新变分函数的关于求解原子近似波函数的计算程序,并且利用该程序计算了氦原子(He)在1S(e),1P(o)态下相应的基态及激发态近似波函数及对应的能量值和径向平均值,并与已有文献中结果进行比较,计算结果显示了HUM理论的缺陷及新变分函数优越性,并就进一步提高激发态的精度指明了方向.

关键词：变分法激发态波函数变分函数组态相互作用

EFFEcTS OF HEAT TREATMEnT On THE MIcROSTRUcTURE OF cu-Zn-Al (RE) SHAPE MEMORY ALLOYS

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sin.c.(English Letters) 2001年第4期14卷 257-262页

作者： n.c. Si and S.c. Sun Material Science and Engineering School, Jiangsu University of Science and Technology, Jiangsu 212013, china Sch. of Mat. Sci. and Eng. Jiangsu Univ. of Sci. and Technol. Jiangsu 212013 China

The effects of heat treatment on the cu-Zn-Al shape memory alloys with mixed REwere researched with the help of X-ray diffraction and transmission electron micro-scope (TEM).The results show that the shape memory alloys with martensite can beproduced by adding mixed RE and heat treatment processes holding at 820c -880cfor 15min,quenching into oil,aging at 150c for 15min,and then holding in waterat 50c for *** alloys have the lowest transformation thermal *** the four experimental heat treatment processes the gradationally quenchingmakes the alloy have the highest transformation temperature and quenching into oilor water at room temperature makes the alloy have the largest thermal ***-crostructure examination shows that aging at 2000c could destroy the substructuresin lathy martensites in the alloy and form a lot of dislocations,and aging at 250℃could cause the bainite transformation in the alloy.

关键词： cu-Zn-Al (RE) heat treatment transformation temperature thermoelastic martensite

在线全文

学校读者我要写书评

暂无评论

哲学与现代派艺术

InFLUEncE OF PROcESSInG On SHAPE MEMORY EFFEcT OF Fe-Mn-Si-ni-c-RE SHAPE MEMORY ALLOY

作者： (苏)n.c.库列科娃

来源：南通市图书馆图书评论

学校读者我要写书评

暂无评论

Acta Metallurgica Sin.c.(English Letters) 2003年第5期16卷 385-394页

作者： n.c. Si, Z.H. Jia and L.B. QiSchool of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, china School of Materials Science and Engineering Jiangsu University Zhenjiang 212013 China

Effect of carbon, compound RE, quenching temperature, pre-strain and recovery temperature on shape memory effect (SME) of Fe-Mn-Si-ni-c-RE shape memory alloy was studied by bent measurement, thermal cycle training, SEM etc. It was shown that the grains of alloys addition with compound RE became finer and SME increased evidently. SME of the alloy was weakening gradually as carbon.c.ntent increased under small strain (3%). But in the condition of large strain (more than 6%), SME of the alloy whose carbon.c.ntent range from 0.1% to 0.12% showed small decreasing range, especially of alloy with the addition of compound RE. Results were also indicated that SME was improved by increasing quenching temperature (>1000℃). The amount of thermal induced martensite increased and the relative shape recovery ratio could be increased to more than 40% after 3-4 times thermal training. The relative shape recovery ratio decreased evidently depending on rising of pre-strain. Furthermore, because speed of martensite transition was extremely great under higher tempering temperature (more than 450℃, ε → γ transition.c.mpleted in 10s meanwhile the relative shape recovery ratio of the alloy increased rapidly.

关键词： Fe-Mn-Si-ni-c-RE shape memory alloy quenching temperature pre-strain recovery temperature shape memory effect