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排序方式: 共有610条查询结果,搜索用时 15 毫秒
81.
Wilfried Pestemer und Werner Mannt 《Zeitschrift für Lebensmitteluntersuchung und -Forschung A》1980,171(4):272-277
Zusammenfassung Die Rückstandssituation von 14 herbiciden Wirkstoffen (Alachlor, Chloridazon, Chlorpropham, Chloroxuron, Chlorthal-methyl, Desmetryn, Lenacil, Linuron, Methabenzthiazuron, Monolinuron, Napropamid, Pendimethalin, Phenmedipham und Terbutryn) in 6 Küchenkräutern (Borretsch, Dill, Kerbel, Kresse, Pimpinelle und Sauerampfer) wird erläutert anhand von Rückstandsdaten aus Freilandversuchen (2 Vegetationsperioden), die in zwei Laboratorien ermittelt wurden. Die Methoden werden schematisch beschrieben sowie Bestimmungsgrenzen und Wiederfindungsraten für beide Laboratorien angegeben.
Herbicide residues in some herbs
Summary Residue occurrence is discussed with use of 14 herbicides (Alachlor, Chloridazone, Chlorpropham, Chloroxuron, Chlorthal-methyl, Desmetryne, Lenacil, Linuron, Methabenzthiazuron, Monolinuron, Napropamide, Pendimethalin, Phenmedipham and Terbutryne) on 6 herbs (borage, dill, garden-chervil, garden cress, anise and sorrel) in the light of residue analyses (from field trials over two seasons with analyses carried out in two laboratories). The methods are outlined; limits of the determinations and recoveries are given.相似文献
82.
Versuche und Rechnungen zur Ankoppelung von Ultraschall an heiße, metallische Prüfstücke durch Wasser. Ermittlung der höchsten, eine Ultraschallübertragung durch Wasser noch zulassenden Oberflächentemperatur. Ankoppelungszeiten in Abhängigkeit von Wasserdurchfluß, Wassertemperatur und Oberflächentemperatur. Beschreibung eines wirksamen Kühlverfahrens zur schnellen Ankoppelung an bewegte Prüfstücke bei hohen Temperaturen. Anwendung auf Stranggußknüppel mit einer Oberflächentemperatur von 1250 °C bei einer Prüfgeschwindigkeit von 3 m/min. Rißempfindlichkcit verschiedener Stähle gegenüber rascher Abkühlung. 相似文献
83.
de Boer AR Alcaide-Hidalgo JM Krabbe JG Kolkman J van Emde Boas CN Niessen WM Lingeman H Irth H 《Analytical chemistry》2005,77(24):7894-7900
The potential of high-temperature liquid chromatography (HTLC) was investigated in an on-line combination with a screening system for bioactive compounds against the enzyme cathepsin B. Samples were separated by HTLC and subsequently analyzed by an on-line continuous-flow enzymatic assay. Detection was performed by electrospray ionization mass spectrometry, revealing both the bioactivity and the molecular mass of the bioactive compounds. Compared to conventional reversed-phase liquid chromatography, the amount of methanol necessary for separation could be decreased to only 10%, which improved the compatibility of LC with a biochemical assay. Sufficient preheating of the mobile phase prior to the separation and postcolumn cooling to prevent deactivation of the enzyme, even at column temperatures as high as 208 degrees C, was achieved as indicated by the reliable peak shapes obtained. The sensitivity was comparable with previously described systems operating at ambient temperatures as similar IC50 values were obtained. Exposing the inhibitors to high temperatures did not lead to thermal decomposition. The separation of inhibitors and the subsequent biochemical assay was performed either isothermally at various temperatures or by applying various temperature gradients as well as at various flow rates. The results obtained clearly show the compatibility of HTLC with an enzymatic screening assay. 相似文献
84.
Zur Frage der Kohlenstoffbestimmung bei emissionsspektrometrischen Verwechslungsprüfungen an Stählen
Notwendigkeit der Kohlenstoffbestimmung bei Verwechslungsprüfungen. Spektralanalytische Möglichkeiten bei Funken-und Bogenanregung in Luft. Einflüsse einiger Legierungselemente. Wiederholbarkeit und Bestimmungsgrenzen. Bestehende Forderungen. 相似文献
85.
M Vandervorst I Liebaers K Sermon C Staessen A De Vos H Van de Velde E Van Assche H Joris A Van Steirteghem P Devroey 《Canadian Metallurgical Quarterly》1998,13(11):3169-3176
The inheritance pattern of monogenic inheritable disorders influences the proportion of unaffected embryos after preimplantation genetic diagnosis (PGD). We aimed to investigate the influence of the number of cumulus-oocyte complexes (COC) on the outcome after PGD. Eighty-four cycles of 47 couples were included in our analysis. All couples were at risk of transmitting autosomal recessive, autosomal dominant, X-linked single gene disorders or sexaneuploidies to their offspring. One PGD cycle was carried out for a Yq-deletion of the man. The correlation between the numbers of COC and biopsied embryos and between the numbers of COC and unaffected embryos was highly significant (P <0.05). A pregnancy occurred in 15 cycles and a minimum of six COC were needed to achieve a pregnancy. Thirteen pregnancies were observed in cycles with at least 9 COC. The transfer rate and number of transferred embryos per cycle in the subgroups with <9 COC and > or =9 COC were significantly higher in the latter. Although pregnancy rates did not differ significantly between the two subgroups (probably due to the low number of pregnancies), our data indicate that it is justifiable to cancel PGD cycles in which it is expected that <6 COC will be retrieved and that the couple should be informed about the poor prognosis if <9 COC are retrieved. 相似文献
86.
87.
用伪并行遗传/模拟退火算法进行多流股换热器网络综合的研究 总被引:4,自引:0,他引:4
The multi-stream heat exchanger network synthesis (HENS) problem can be formulated as a mixed integer nonlinear programming model according to Yee et al. Its nonconvexity nature leads to existence of more than one optimum and computational difficulty for traditional algorithms to find the global optimum. Compared with deterministic algorithms, evolutionary computation provides a promising approach to tackle this problem. In this paper, a mathematical model of multi-stream heat exchangers network synthesis problem is setup. Different from the assumption of isothermal mixing of stream splits and thus linearity constraints of Yee et al., non-isothermal mixing is supported. As a consequence, nonlinear constraints are resulted and nonconvexity of the objective function is added. To solve the mathematical model, an algorithm named GA/SA (parallel genetic/simulated annealing algorithm) is detailed for application to the multi-stream heat exchanger network synthesis problem. The performance of the proposed approach is demonstrated with three examples and the obtained solutions indicate the presented approach is effective for multi-stream HENS. 相似文献
88.
Marleen Morbee Antoni Roca Josep Prades-Nebot Aleksandra Pižurica Wilfried Philips 《Signal, Image and Video Processing》2008,2(2):129-140
In some video coding applications, it is desirable to reduce the complexity of the video encoder at the expense of a more
complex decoder. Wyner–Ziv (WZ) video coding is a new paradigm that aims to achieve this. To allocate a proper number of bits
to each frame, most WZ video coding algorithms use a feedback channel, which allows the decoder to request additional bits
when needed. However, due to these multiple bit requests, the complexity and the latency of WZ video decoders increase massively.
To overcome these problems, in this paper we propose a rate allocation (RA) algorithm for pixel-domain WZ video coders. This
algorithm estimates at the encoder the number of bits needed for the decoding of every frame while still keeping the encoder
complexity low. Experimental results show that, by using our RA algorithm, the number of bit requests over the feedback channel—and
hence, the decoder complexity and the latency—are significantly reduced. Meanwhile, a very near-to-optimal rate-distortion
performance is maintained.
This work has been partially supported by the Spanish Ministry of Education and Science and the European Commission (FEDER)
under grant TEC2005-07751-C02-01.
A. Pižurica is a postdoctoral research fellow of FWO, Flanders. 相似文献
89.
90.