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961.
We present a non-intrusive molecular dye based method, i.e., laser-induced fluorescence photobleaching anemometer (LIFPA),
to significantly increase temporal resolution (TR) for velocity measurement of fast transient electrokinetic flows. To our
knowledge, the TR has been for the first time achieved to 5–10 μs, about 100 times better than that published from state-of-the-art
micro particle image velocimetry (μPIV), which is currently the most widely used velocimetry in the microfluidics community.
The new method provides us with new opportunities to study experimentally the fundamental phenomena of unsteady electrokinetics
(EK) and to validate relevant theoretical models. One application of the new method is demonstrated by measuring the rise
time of DC electroosmotic flows (EOFs) in a microcapillary of 10 μm in diameter. 相似文献
962.
Thomas?Lavergne Tanguy?Urvoy Fran?ois?YvonEmail author 《Language Resources and Evaluation》2011,45(1):25-43
Fake content is flourishing on the Internet, ranging from basic random word salads to web scraping. Most of this fake content
is generated for the purpose of nourishing fake web sites aimed at biasing search engine indexes: at the scale of a search
engine, using automatically generated texts render such sites harder to detect than using copies of existing pages. In this
paper, we present three methods aimed at distinguishing natural texts from artificially generated ones: the first method uses
basic lexicometric features, the second one uses standard language models and the third one is based on a relative entropy
measure which captures short range dependencies between words. Our experiments show that lexicometric features and language
models are efficient to detect most generated texts, but fail to detect texts that are generated with high order Markov models.
By comparison our relative entropy scoring algorithm, especially when trained on a large corpus, allows us to detect these
“hard” text generators with a high degree of accuracy. 相似文献
963.
Yu-Tzu?Chen Wei-Feng?Fang Yen-Cheng?Liu Jing-Tang?YangEmail author 《Microfluidics and nanofluidics》2011,11(3):339-352
The mixing and reaction performance of a split-and-recombine (SAR) microreactor was enhanced on modification of the geometric
configuration. A rotation of fluid is induced on shrinking the structure of the splitting and reorientation region in alternate
directions, thus improving the pattern of multi-lamination and enhancing the chaos of the fluid. To design and to analyze
systematically the performance of the reactors, an effective method involving chaotic analysis and fluorescent resonant-energy
transfer (FRET) is proposed. The structural design of a passive microreactor to generate an effective contact between the
reagents is of great practical significance. SAR microreactors of four types with various microstructures were designed to
illustrate the effects of geometric patterns (i.e., arrangement and dimensions) on mixing and reaction. Through analysis of
the chaos, we revealed numerically the dynamic mixing governed by multi-lamination and chaotic mechanisms in the devices.
The results show that specific structural designs induce rotation and rearrangement of fluids, thus elongating their material
interface; the mixing of the fluids consequently improved. We investigated the hybridization of two complementarily labeled
oligonucleotides in the devices by means of FRET. How the devices affected the rate of hybridization was thereby assessed,
verifying that FRET is a technique capable of estimating the practical applicability of these devices. 相似文献
964.
Georg Birkenheuer Andr�� Brinkmann Mikael H?gqvist Alexander Papaspyrou Bernhard Schott Dietmar Sommerfeld Wolfgang Ziegler 《Journal of Grid Computing》2011,9(3):355-377
Infrastructure federation is becoming an increasingly important issue for modern Distributed Computing Infrastructures (DCIs):
Dynamic elasticity of quasi-static Grid environments, incorporation of special-purpose resources into commoditized Cloud infrastructures,
cross-community collaboration for increasingly diverging areas of modern e-Science, and Cloud Bursting pose major challenges
on the technical level for many resource and middleware providers. Especially with respect to increasing costs of operating
data centers, the intelligent yet automated and secure sharing of resources is a key factor for success. With the D-Grid Scheduler
Interoperability (DGSI) project within the German D-Grid Initiative, we provide a strategic technology for the automatically
negotiated, SLA-secured, dynamically provisioned federation of resources and services for Grid-and Cloud-type infrastructures.
This goal is achieved by complementing current DCI schedulers with the ability to federate infrastructure for the temporary
leasing of resources and rechanneling of workloads. In this work, we describe the overall architecture and SLA-secured negotiation
protocols within DGSI and depict an advanced mechanism for resource delegation through means of dynamically provisioned, virtualized
middleware. Through this methodology, we provide the technological foundation for intelligent capacity planning and workload
management in a cross-infrastructure fashion. 相似文献
965.
Boles?aw Kacewicz 《Quantum Information Processing》2011,10(3):279-296
We deal with quantum and randomized algorithms for approximating a class of linear continuous functionals. The functionals
are defined on a H?lder space of functions f of d variables with r continuous partial derivatives, the rth derivative being a H?lder function with exponent ρ. For a certain class of such linear problems (which includes the integration problem), we define algorithms based on partitioning
the domain of f into a large number of small subdomains, and making use of the well-known quantum or randomized algorithms for summation
of real numbers. For N information evaluations (quantum queries in the quantum setting), we show upper bounds on the error of order N
−(γ+1) in the quantum setting, and N
−(γ+1/2) in the randomized setting, where γ = (r + ρ)/d is the regularity parameter. Hence, we obtain for a wider class of linear problems the same upper bounds as those known for
the integration problem. We give examples of functionals satisfying the assumptions, among which we discuss functionals defined
on the solution of Fredholm integral equations of the second kind, with complete information about the kernel. We also provide
lower bounds, showing in some cases sharpness of the obtained results, and compare the power of quantum, randomized and deterministic
algorithms for the exemplary problems. 相似文献
966.
Haiping?MaEmail author Xieyong?Ruan Zhangxin?Pan 《International Journal of Control, Automation and Systems》2011,9(1):125-131
In order to have a good performance for maneuvering target tracking, a genetic interacting multiple model (GIMM) algorithm
based on the H
∞ filter is proposed in this paper. It introduces the H
∞ filter as model-conditional filter, which keeps its robustness by constantly adjusting parameters, to improve the performance
and the precision. Meanwhile, it optimizes model probabilities using the genetic algorithm (GA), chooses sub-models which
are close to true models from a set of models, adjusts the number of models and parameters in real-time, reduces excessive
competition, and improves the performance of the algorithm. The simulation results indicate that, the algorithm has higher
tracking accuracy and stronger robustness than the standard IMM algorithm. 相似文献
967.
Human activity recognition is a challenging problem for context-aware systems and applications. Research in this field has
mainly adopted techniques based on supervised learning algorithms, but these systems suffer from scalability issues with respect
to the number of considered activities and contextual data. In this paper, we propose a solution based on the use of ontologies
and ontological reasoning combined with statistical inferencing. Structured symbolic knowledge about the environment surrounding
the user allows the recognition system to infer which activities among the candidates identified by statistical methods are
more likely to be the actual activity that the user is performing. Ontological reasoning is also integrated with statistical
methods to recognize complex activities that cannot be derived by statistical methods alone. The effectiveness of the proposed
technique is supported by experiments with a complete implementation of the system using commercially available sensors and
an Android-based handheld device as the host for the main activity recognition module. 相似文献
968.
Stephen Gilmore L��szl�� G?nczy Nora Koch Philip Mayer Mirco Tribastone D��niel Varr�� 《Software and Systems Modeling》2011,10(3):287-311
Systems based on the service-oriented architecture (SOA) principles have become an important cornerstone of the development
of enterprise-scale software applications. They are characterized by separating functions into distinct software units, called
services, which can be published, requested and dynamically combined in the production of business applications. Service-oriented
systems (SOSs) promise high flexibility, improved maintainability, and simple re-use of functionality. Achieving these properties
requires an understanding not only of the individual artifacts of the system but also their integration. In this context,
non-functional aspects play an important role and should be analyzed and modeled as early as possible in the development cycle.
In this paper, we discuss modeling of non-functional aspects of service-oriented systems, and the use of these models for
analysis and deployment. Our contribution in this paper is threefold. First, we show how services and service compositions
may be modeled in UML by using a profile for SOA (UML4SOA) and how non-functional properties of service-oriented systems can
be represented using the non-functional extension of UML4SOA (UML4SOA-NFP) and the MARTE profile. This enables modeling of
performance, security and reliable messaging. Second, we discuss formal analysis of models which respect this design, in particular
we consider performance estimates and reliability analysis using the stochastically timed process algebra PEPA as the underlying
analytical engine. Last but not least, our models are the source for the application of deployment mechanisms which comprise
model-to-model and model-to-text transformations implemented in the framework VIATRA. All techniques presented in this work
are illustrated by a running example from an eUniversity case study. 相似文献
969.
The objective of the paper is to describe a novel finite element computational method based on a strain energy density function and to implement it in the object-oriented environment. The original energy-based finite element was put into the known standard framework of classes and handled in a different manner. The nonlinear properties of material are defined with a modified strain energy density function. The local relaxation procedure proposed as a method used to resolve a nonlinear problem is implemented in C++ language. The hexahedral element with eight nodes as well as the adaptation of the nonlinear finite element is introduced. The chosen numerical model is made of nearly incompressible hyperelastic material. The application of the proposed element is shown on the example of a rectangular parallelepiped with a hollow port. 相似文献
970.
Branislav ?urian 《Information Processing Letters》2010,110(4):148-152
We present improved variations of the BNDM algorithm for exact string matching. At each alignment our bit-parallel algorithms process a q-gram before testing the state variable. In addition we apply reading a 2-gram in one instruction. Our point of view is practical efficiency of algorithms. Our experiments show that the new variations are faster than earlier algorithms in many cases. 相似文献