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91.
相控阵超声检测系统特性评价的具体要求(一) 总被引:1,自引:0,他引:1
超声相控阵技术对缺陷的检出能力,对缺陷定位、定量、定性表征的准确性,相关于相控阵仪器和系统特性的综合功能。本文介绍ASMEBPVC(美国锅炉压力容器法规)最新版(2009增补)有关相控阵超声检测仪器和系统特性评价的具体要求,包括相控阵:(1)声柬轮廓的测定;(2)声柬变角范围的测定;(3)阵元激活性的测定;(4)聚焦能力的测定;(5)参数和数据显示的计算机控制;(6)探头楔块衰减和延迟补偿的评价:(7)仪器垂直线性和水平线性及动态范围的评价。期望为国内承压设备相控阵超声检测的有效应用和标准化,提供法定依据和有用借鉴。 相似文献
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A new mathematical model for buoyancy-driven ventilation [Sandbach SD, Lane-Serff GF. Transient buoyancy-driven ventilation: Part 1. Modelling advection. Building and Environment, 2011] is modified to include heat transfer at the boundaries. Heat transfers at the ceiling and floor are included, using Newton’s law of cooling to model convective heat transfer between the air and the solid boundaries, Fourier’s law to model conductive heat transfer through the floor and ceiling, and a linear version of the Stefan–Boltzmann law to model radiative heat transfer from the ceiling to the floor. The effectiveness of the model was assessed using experimental results obtained in a full-scale test room. In these experiments, the vertical temperature stratification was measured using an array of T-type thermocouples. Speed measurements were obtained to estimate the ventilation flow rate (for displacement ventilation) and the velocity profile across the doorway (for doorway ventilation). Buoyancy was introduced using a twin-hob (∼2.35 kW) heat source, and in most cases a diffuse two-layer temperature stratification developed. The results from these experiments are compared with the model and existing adiabatic models. Our results indicate that the effect of heat transfer at the boundaries on the final stratification is significant and should not be ignored. Furthermore, direct comparisons between the measured and modelled results are in general very good. 相似文献
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G. Kanagaraj Ashwin Mahalingam 《Energy and Buildings》2011,43(9):2329-2343
This paper provides a means for improving the effectiveness of energy related decision-making during the design phase of a building. A review of the literature and discussions with experts revealed that several approaches for an Integrated Design Process for energy efficient buildings exist. However, most of these approaches are relatively abstract and philosophical in nature, and do not prescribe procedures that enable energy efficient design.This paper attempts to address this gap by proposing a comprehensive design process titled the ‘Integrated Energy-Efficient Building Design Process’ (IEBDP). This process provides a framework based on systems theory that facilitates the integration of various facets of the energy-efficient alternatives selection process. In addition, the proposed framework seeks to integrate state-of-the-art analysis tools and methods, to aid designers in performing holistic building design. Analytical Hierarchy Process (AHP), a multi-attribute decision-making technique is used to resolve conflicts amongst diverging design goals.The proposed IEBDP framework was then used to design an office building, taken as a case study, in the composite climate of New Delhi, India. It was found that considerable energy savings could be achieved by following the IEBDP process. The benefits of this framework vis-a-vis traditional energy efficient design approaches were evaluated by comparing the design done through the IEBDP process with designs submitted by a group of practicing architects. The various designs were evaluated in terms of strategies adopted, the level of exploration as well as design integration, in order to validate the applicability and use of the IEBDP framework. 相似文献
96.
Andrea Mura 《Mechatronics》2011,21(8):1309-1316
Acquisition of the displacements and deformations of a loaded component is generally a not easy operation. This is especially the case as the component often presents a complex geometry and the deformations involve more degrees of freedom or a combination of them.Measurement devices used for this kind of application often allow to obtain simplified measurements.This paper presents a novel measurement device, consisting of six displacement sensors mounted as a parallel mechanism, capable to measure the global deformation of a component in terms of translations and rotations. The deformations are obtained by applying the direct kinematic equations to convert the six displacements read from the six sensors into the three translations and rotations representing the deformation of the component.The geometry of the device leads to write simplified equations for the direct kinematic that can be solved with a semi-numerical procedure implemented in a program written in Matlab environment.The results given by this procedure have been validated with the positions obtained from a 3D CAD model of the device, showing perfect agreement between the results.A prototype has been made and tested on a workbench. 相似文献
97.
车路互联网的底层协议-802.11p标准 总被引:1,自引:0,他引:1
详细地描述了车路互联网系统的底层协议-802.11p标准。将802.11p与传统无线局域网技术进行对比,分析了802.11p在媒体接入控制层(MAC)与物理层(PHY)所做的修改,并从物理层参数、PP—DU帧结构,以及接人优先级等多方面指出了802.11p能在高速移动环境下建立稳定通信链路的原因。其次,还对802.11p所采用的频段、信道、发射功率以及频谱掩模进行分析;最后提出了802.11p在仿真方面所面临的挑战,并且在Simulink上建立了一套动态仿真系统,对标准进行仿真验证。 相似文献
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针对目前小环境温度监测系统的现状,介绍了单总线技术和DS18B20数字式传感器的特点。以AT89C51单片机为核心控制部件,结合小环境温度控制系统的要求,设计了基于单总线技术的小环境温度监测系统,并给出了该监测系统的硬件结构和进行了相应的软件设计。从实际应用结果表明,该系统具有测量精度高、抗干扰性强、可靠性高和性价比好等特点,在工程实际应用中具有重要意义。 相似文献
100.
Erik Denneman Rongzong Wu Elsabe P. Kearsley Alex T. Visser 《Engineering Fracture Mechanics》2011,(10):2235-2245
In this paper a simple, but effective methodology to simulate opening mode fracture in high performance fibre reinforced concrete is presented. The main contribution of the paper is a technique to extrapolate the load displacement curves of three point bending experiments on fibre reinforced concrete. The extrapolation allows the full work of fracture to be determined, from which the fracture energy may be obtained. The fracture energy is used in the definition of a cohesive softening function with crack tip singularity. The softening relation is implemented in an embedded discontinuity method, which is employed for the numerical simulation of three point bending experiments. The experimental work includes a size effect study on three point bending specimens. The numerical simulation provides a satisfactory prediction of the flexural behaviour and the size effect observed in the experiments. 相似文献