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51.
George A. Grindahl John R. Greenwald Louis H. Troporcer Ogden R. Pierce Yung K. Kim 《Journal of polymer science. Part A, Polymer chemistry》1974,12(7):1559-1564
Four new s-triazine polymers were prepared by the mercury-induced coupling of bromodifluoromethyl-substituted ditriazinyl-perfluoroalkane derivatives. Each polymer was composed of CF3-substituted s-triazin rings alternately joined with ? CF2CF2? segments and \documentclass{article}\pagestyle{empty}\begin{document}$\hbox{---}\hskip-5pt({\rm CF}_2 )_8 \hbox{---}$\end{document}, a mixture of ? (CF3CFO(CF2)5OCF(CF3)? and ? (CF3)CFOCF2CF(CF3)OCF2)4? , ? CF2OCF2? , or ? CF2SCF2? , segments. All polymers were elastomeric and displayed high temperature stability on thermogravimetric analysis. The polymers containing either ? CF2OCF2? or ? CF2SCF2? segments showed high temperature limits slightly lower than the other two systems. 相似文献
52.
In the surface of the ferromagnetic insulator EuO is covered with a small amount of cesium, the photoelectric magnetization curves P(H) show magnetic saturation in contrast to those of the pure surface. The proximity of the Cs film causes the paramagnetism of the clean EuO surface to disappear. 相似文献
53.
Robyn Pierce Kaye Stacey 《International Journal of Computers for Mathematical Learning》2010,15(1):1-20
This paper proposes a taxonomy of the pedagogical opportunities that are offered by mathematics analysis software such as
computer algebra systems, graphics calculators, dynamic geometry or statistical packages. Mathematics analysis software is
software for purposes such as calculating, drawing graphs and making accurate diagrams. However, its availability in classrooms
also provides opportunities for positive changes to teaching and learning. Very many examples are documented in the professional
and research literature, and in this paper we organize them into 10 types. These are displayed in the form of a ‘pedagogical
map’, which further classifies them according to whether the opportunity arises from new opportunities for the mathematical
tasks used, change to interpersonal aspects of the classroom or change to the point of view on mathematics as a subject. The
map can be used in teacher professional development to draw attention to possibilities for lessons or as a catalyst for professional
discussion. For research on teaching, it can be used to map current practice, or to track professional growth. The intention
of the map is to summarise the potential benefits of teaching with technology in a form that may be useful for both teachers
and researchers. 相似文献
54.
55.
The principal result is that if G is any irreducible subgroup of GL(n, C) (C the complex field) such that |tr(7^)| is uniformly bounded for all A in G and some fixed n × n nonzero matrix T, then G is equivalent to a unitary group. Similar results are proved for certain associated representations of G. 相似文献
56.
Dr. Benjamin A. Chalmers Hui Xing Sevan Houston Dr. Charlotte Clark Dr. Sussan Ghassabian Dr. Andy Kuo Benjamin Cao Andrea Reitsma Cody‐Ellen P. Murray Dr. Jeanette E. Stok Dr. Glen M. Boyle Carly J. Pierce Stuart W. Littler Prof. David A. Winkler Prof. Paul V. Bernhardt Dr. Cielo Pasay Prof. James J. De Voss Prof. James McCarthy Prof. Peter G. Parsons Prof. Gimme H. Walter Prof. Maree T. Smith Prof. Helen M. Cooper Prof. Susan K. Nilsson Dr. John Tsanaktsidis Dr. G. Paul Savage Prof. Craig M. Williams 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2018,130(28):8491-8491
57.
Minkyu Kim Moon Jong Han Hansol Lee Paraskevi Flouda Daria Bukharina Kellina J. Pierce Katarina M. Adstedt Madeline L. Buxton Young Hee Yoon William T. Heller Srikanth Singamaneni Vladimir V. Tsukruk 《Angewandte Chemie (International ed. in English)》2023,62(30):e202305646
Chiral metal–organic frameworks (MOFs) have gained rising attention as ordered nanoporous materials for enantiomer separations, chiral catalysis, and sensing. Among those, chiral MOFs are generally obtained through complex synthetic routes by using a limited choice of reactive chiral organic precursors as the primary linkers or auxiliary ligands. Here, we report a template-controlled synthesis of chiral MOFs from achiral precursors grown on chiral nematic cellulose-derived nanostructured bio-templates. We demonstrate that chiral MOFs, specifically, zeolitic imidazolate framework (ZIF), unc -[Zn(2-MeIm)2, 2-MeIm=2-methylimidazole], can be grown from regular precursors within nanoporous organized chiral nematic nanocelluloses via directed assembly on twisted bundles of cellulose nanocrystals. The template-grown chiral ZIF possesses tetragonal crystal structure with chiral space group of P41, which is different from traditional cubic crystal structure of I-43 m for freely grown conventional ZIF-8. The uniaxially compressed dimensions of the unit cell of templated ZIF and crystalline dimensions are signatures of this structure. We observe that the templated chiral ZIF can facilitate the enantiotropic sensing. It shows enantioselective recognition and chiral sensing abilities with a low limit of detection of 39 μM and the corresponding limit of chiral detection of 300 μM for representative chiral amino acid, D- and L- alanine. 相似文献
58.
Prasad S Pierce KM Schmidt H Rao JV Güth R Synovec RE Smith GB Eiceman GA 《The Analyst》2008,133(6):760-767
Four bacteria, Escherichia coli, Pseudomonas aeruginosa, Staphylococcus warneri, and Micrococcus luteus, were grown at temperatures of 23, 30, and 37 degrees C and were characterized by pyrolysis-gas chromatography/differential mobility spectrometry (Py-GC/DMS) providing, with replicates, 120 data sets of retention time, compensation voltage, and ion intensity, each for negative and positive polarity. Principal component analysis (PCA) for 96 of these data sets exhibited clusters by temperature of culture growth and not by genus. Analysis of variance was used to isolate the constituents with dependences on growth temperature. When these were subtracted from the data sets, Fisher ratios with PCA resulted in four clusters according to genus at all temperatures for ions in each polarity. Comparable results were obtained from unsupervised PCA with 24 of the original data sets. The ions with taxonomic features were reconstructed into 3D plots of retention time, compensation voltage, and Fisher ratio and were matched, through GC-mass spectrometry (MS), with chemical standards attributed to the thermal decomposition of proteins and lipid A. Results for negative ions provided simpler data sets than from positive ions, as anticipated from selectivity of gas phase ion-molecule reactions in air at ambient pressure. 相似文献
59.
Benjamin A. Chalmers Hui Xing Sevan Houston Charlotte Clark Sussan Ghassabian Andy Kuo Benjamin Cao Andrea Reitsma Cody‐Ellen P. Murray Jeanette E. Stok Glen M. Boyle Carly J. Pierce Stuart W. Littler David A. Winkler Paul V. Bernhardt Cielo Pasay James J. DeVoss James McCarthy Peter G. Parsons Gimme H. Walter Maree T. Smith Helen M. Cooper Susan K. Nilsson John Tsanaktsidis G. Paul Savage Craig M. Williams 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2016,128(11)
60.
Dong X Gilbert KE Guha R Heiland R Kim J Pierce ME Fox GC Wild DJ 《Journal of chemical information and modeling》2007,47(4):1303-1307
The vast increase of pertinent information available to drug discovery scientists means that there is a strong demand for tools and techniques for organizing and intelligently mining this information for manageable human consumption. At Indiana University, we have developed an infrastructure of chemoinformatics Web services that simplifies the access to this information and the computational techniques that can be applied to it. In this paper, we describe this infrastructure, give some examples of its use, and then discuss our plans to use it as a platform for chemoinformatics application development in the future. 相似文献