全文获取类型
收费全文 | 128篇 |
免费 | 6篇 |
国内免费 | 3篇 |
专业分类
化学 | 79篇 |
力学 | 2篇 |
数学 | 19篇 |
物理学 | 37篇 |
出版年
2022年 | 2篇 |
2021年 | 1篇 |
2020年 | 1篇 |
2019年 | 1篇 |
2018年 | 3篇 |
2016年 | 3篇 |
2015年 | 1篇 |
2014年 | 7篇 |
2013年 | 5篇 |
2012年 | 7篇 |
2011年 | 10篇 |
2010年 | 11篇 |
2009年 | 4篇 |
2008年 | 9篇 |
2007年 | 7篇 |
2006年 | 3篇 |
2005年 | 3篇 |
2004年 | 3篇 |
2003年 | 4篇 |
2002年 | 5篇 |
2001年 | 4篇 |
2000年 | 3篇 |
1999年 | 1篇 |
1997年 | 3篇 |
1996年 | 1篇 |
1988年 | 1篇 |
1986年 | 1篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1980年 | 2篇 |
1979年 | 1篇 |
1976年 | 2篇 |
1974年 | 1篇 |
1971年 | 1篇 |
1958年 | 1篇 |
1957年 | 1篇 |
1954年 | 19篇 |
1944年 | 1篇 |
排序方式: 共有137条查询结果,搜索用时 15 毫秒
81.
Doris Pospiech Liane Hußler Kathrin Eckstein Dieter Voigt Dieter Jehnichen Antje Gottwald Wolfram Kollig Andreas Janke Karina Grundke Carsten Werner Hans R. Kricheldorf 《Macromolecular Symposia》2001,163(1):113-126
Linking segments of two different polymers in block copolymers offers the opportunity to combine their macroscopic properties and to design tailor‐made materials. This is shown for segmented block copolymers (A‐B)n in which the basic segment is polysulfone. Incorporation of either hydrophilic and or hydrophobic segments results in a dramatic change of surface properties which is also correlated to the bulk structure of the block copolymers. 相似文献
82.
We define common thermodynamic concepts purely within the framework of general Markov chains and derive Jarzynski’s equality and Crooks’ fluctuation theorem in this setup. In particular, we regard the discrete-time case, which leads to an asymmetry in the definition of work that appears in the usual formulation of Crooks’ fluctuation theorem. We show how this asymmetry can be avoided with an additional condition regarding the energy protocol. The general formulation in terms of Markov chains allows transferring the results to other application areas outside of physics. Here, we discuss how this framework can be applied in the context of decision-making. This involves the definition of the relevant quantities, the assumptions that need to be made for the different fluctuation theorems to hold, as well as the consideration of discrete trajectories instead of the continuous trajectories, which are relevant in physics. 相似文献
83.
Hahn KR Tricoli A Santarossa G Vargas A Baiker A 《Langmuir : the ACS journal of surfaces and colloids》2012,28(2):1646-1656
Both associative and dissociative H(2)O adsorption on SnO(2)(110), TiO(2)(110), and Ti-enriched Sn(1-x)Ti(x)O(2)(110) surfaces have been investigated at low ((1)/(12) monolayer (ML)) and high coverage (1 ML) by density functional theory calculations using the Gaussian and plane waves formalism. The use of a large supercell allowed the simulation at low symmetry levels. On SnO(2)(110), dissociative adsorption was favored at all coverages and was accompanied by stable associative H(2)O configurations. Increasing the coverage from (1)/(12) to 1 ML stabilized the (associatively or dissociatively) adsorbed H(2)O on SnO(2)(110) because of the formation of intermolecular H bonds. In contrast, on TiO(2)(110), the adsorption of isolated H(2)O groups ((1)/(12) ML) was more stable than at high coverage, and the favored adsorption changed from dissociative to associative with increasing coverage. For dissociative H(2)O adsorption on Ti-enriched Sn(1-x)Ti(x)O(2)(110) surfaces with Ti atoms preferably located on 6-fold-coordinated surface sites, the analysis of the Wannier centers showed a polarization of electrons surrounding bridging O atoms that were bound simultaneously to 6-fold-coordinated Sn and Ti surface atoms. This polarization suggested the formation of an additional bond between the 6-fold-coordinated Ti(6c) and bridging O atoms that had to be broken upon H(2)O adsorption. As a result, the H(2)O adsorption energy initially decreased, with increasing surface Ti content reaching a minimum at 25% Ti for (1)/(12) ML. This behavior was even more accentuated at high H(2)O coverage (1 ML) with the adsorption energy decreasing rapidly from 145.2 to 101.6 kJ/mol with the surface Ti content increasing from 0 to 33%. A global minimum of binding energies at both low and high coverage was found between 25 and 33% surface Ti content, which may explain the minimal cross-sensitivity to humidity previously reported for Sn(1-x)Ti(x)O(2) gas sensors. Above 12.5% surface Ti content, the binding energy decreased with increasing coverage, suggesting that the partial desorption of H(2)O is facilitated at a high fractional coverage. 相似文献
84.
Dr. Rosario Oliva Dr. Sanjib K. Mukherjee Lena Ostermeier Lilli A. Pazurek Simon Kriegler Dr. Verian Bader Dr. Daniel Prumbaum Prof. Dr. Stefan Raunser Prof. Dr. Konstanze F. Winklhofer Prof. Dr. Jörg Tatzelt Prof. Dr. Roland Winter 《Chemistry (Weinheim an der Bergstrasse, Germany)》2021,27(46):11845-11851
Liquid-liquid phase separation (LLPS) has emerged as a key mechanism for intracellular organization, and many recent studies have provided important insights into the role of LLPS in cell biology. There is also evidence that LLPS is associated with a variety of medical conditions, including neurodegenerative disorders. Pathological aggregation of α-synuclein, which is causally linked to Parkinson's disease, can proceed via droplet condensation, which then gradually transitions to the amyloid state. We show that the antimicrobial peptide LL-III is able to interact with both monomers and condensates of α-synuclein, leading to stabilization of the droplet and preventing conversion to the fibrillar state. The anti-aggregation activity of LL-III was also confirmed in a cellular model. We anticipate that studying the interaction of antimicrobial-type peptides with liquid condensates such as α-synuclein will contribute to the understanding of disease mechanisms (that arise in such condensates) and may also open up exciting new avenues for intervention. 相似文献
85.
Sebastian Raeder Silke Fies Tina Gottwald Christoph Mattolat Sebastian Rothe Klaus Wendt 《Hyperfine Interactions》2010,196(1-3):71-79
In-source resonance ionization spectroscopy of uranium has been carried out as preparation for the analysis of low contaminations of nuclear material in environmental samples via laser mass spectrometry. Using three-step resonance ionization spectroscopy, 86 levels of odd parity in the energy range from 37,200–38,650 cm???1 were studied, 51 of these levels were previously unknown. Suitable excitation schemes for analytic applications are discussed. 相似文献
86.
M. Abdel-Bary S. Abdel-Samad K-Th. Brinkmann H. Clement J. Dietrich E. Doroshkevich S. Dshemuchadse K. Ehrhardt A. Erhardt W. Eyrich D. Filges A. Filippi H. Freiesleben M. Fritsch W. Gast J. Georgi A. Gillitzer J. Gottwald D. Hesselbarth H. J?ger B. Jakob R. J?kel L. Karsch K. Kilian H. Koch M. Krapp J. Kre? E. Kuhlmann A. Lehmann S. Marcello S. Marwinski S. Mauro W. Meyer P. Michel K. M?ller H. P. Morsch H. M?rtel L. Naumann N. Paul L. Pinna C. Pizzolotto Ch. Plettner S. Reimann M. Richter J. Ritman E. Roderburg A. Schamlott P. Sch?nmeier W. Schroeder M. Schulte-Wissermann T. Sefzick F. Stinzig M. Steinke G. Y. Sun A. Teufel W. Ullrich G. J. Wagner M. Wagner R. Wenzel A. Wilms P. Wintz S. Wirth P. Wüstner P. Zupranski 《The European Physical Journal A - Hadrons and Nuclei》2010,46(1):27-44
87.
W. Hufenbach B. Grüber R. Gottwald M. Lepper B. Zhou 《Mechanics of Composite Materials》2010,46(5):531-538
A solution method for stress concentration problems of fibre- and textile-reinforced multilayered composites with account
of the influence of a circular or elliptical cut-out and of the finite outer boundary of a composite plate is presented. The
method is based on complex-valued displacement functions and conformal mappings in combination with the boundary collocation
and least squares methods. This allows a layer-by-layer calculation of full stress, strain, and displacement fields in a generally
multilayered anisotropic plate. To verify the calculation model, extensive experimental studies have been carried out. For
all the combinations of multilayered GF/PP plates, laminate lay-ups, and notch and specimen dimensions investigated so far,
a very good agreement between the analytical calculations and experimental results is found to exist. 相似文献
88.
We present a normal form for traveling waves in one-dimensional excitable media in the form of a differential delay equation. The normal form is built around the well-known saddle-node bifurcation generically present in excitable media. Finite wavelength effects are captured by a delay. The normal form describes the behavior of single pulses in a periodic domain and also the richer behavior of wave trains. The normal form exhibits a symmetry preserving Hopf bifurcation which may coalesce with the saddle node in a Bogdanov-Takens point, and a symmetry-breaking spatially inhomogeneous pitchfork bifurcation. We verify the existence of these bifurcations in numerical simulations. The parameters of the normal form are determined and its predictions are tested against numerical simulations of partial differential equation models of excitable media with good agreement. 相似文献
89.
Semisynthetic murine prion protein equipped with a GPI anchor mimic incorporates into cellular membranes 总被引:1,自引:0,他引:1
Olschewski D Seidel R Miesbauer M Rambold AS Oesterhelt D Winklhofer KF Tatzelt J Engelhard M Becker CF 《Chemistry & biology》2007,14(9):994-1006
Conversion of cellular prion protein (PrP(C)) into the pathological conformer (PrP(Sc)) has been studied extensively by using recombinantly expressed PrP (rPrP). However, due to inherent difficulties of expressing and purifying posttranslationally modified rPrP variants, only a limited amount of data is available for membrane-associated PrP and its behavior in vitro and in vivo. Here, we present an alternative route to access lipidated mouse rPrP (rPrP(Palm)) via two semisynthetic strategies. These rPrP variants studied by a variety of in vitro methods exhibited a high affinity for liposomes and a lower tendency for aggregation than rPrP. In vivo studies demonstrated that double-lipidated rPrP is efficiently taken up into the membranes of mouse neuronal and human epithelial kidney cells. These latter results enable experiments on the cellular level to elucidate the mechanism and site of PrP-PrP(Sc) conversion. 相似文献
90.
Siegfried Gottwald 《Fuzzy Sets and Systems》1980,3(2):181-192
Fuzzy logic ∞9 considered in connection with fuzzy sets theory, is a special theory, is a special many valued logic with truth-value sets [0, 1], which has been studied already by Lukasiewicz. We consider also his versions m for m ? 2 with finite truth-value sets. In all cases we add two further propositional connectives, one conjunction and one disjunction. For these logics we give a list of tautologies, consider relations between their sets of tautologies, prove their compactness, and mention some further results. 相似文献