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排序方式: 共有184条查询结果,搜索用时 15 毫秒
1.
T Tillmann K Kamino C Dasenbrock H Ernst M Kohler G Morawietz E Campo A Cardesa L Tomatis U Mohr 《Canadian Metallurgical Quarterly》1997,49(3-4):197-200
An experiment using 4279 CBA/J mice of two generations was carried out to investigate the influence of parental preconceptual exposure to X-ray radiation or to chemical carcinogens. Microchips were implanted subcutaneously in the dorsolateral back for unique identification of each animal. The animals were kept for lifespan under standard laboratory conditions. In 36 mice a circumscribed neoplasm occurred in the area of the implanted microchip. Females were significantly more frequently affected than male mice. An influence of age or different treatment on the s.c. tumour incidence in two mice generations could not be observed. Macroscopically, firm, pale white nodules up to 25 mm in diameter with the microchip in its center were found. Microscopically, soft tissue tumours such as fibrosarcoma and malignant fibrous histiocytoma were detected. 相似文献
2.
METHODS FOR BRAZING CERAMIC AND METAL-CERAMIC JOINTS 总被引:5,自引:0,他引:5
Owing to improved manufacturing processes technical ceramics on the basis of oxide as well as nonoxide ceramics have gained an increasing technical potential. Among other joining techniques brazing has proved to be the most flexible joining process that can easily be adapted to various ceramic-metal-combinations. In order to induce a wetting reaction there are two different approaches. The more complicated process encircles a pre-metallization process and a subsequent brazing process. The less sophisticated process is the 'active brazing process' where special brazing alloys are employed that are able to wet ceramic base materials. Although both joining processes are very flexible there are restrictions regarding the filler metals to be used, the premetallization process and the actual (active-) brazing process. 相似文献
3.
Tillmann Barbara; Janata Petr; Birk Jeffrey; Bharucha Jamshed J. 《Canadian Metallurgical Quarterly》2003,29(2):470
Harmonic priming studies have shown that a musical context, with its established tonal center, influences target chord processing. This study investigated costs and benefits of priming tonal centers for target processing by adding a baseline condition (sequences without a specific tonal center). Results confirmed harmonic priming, with faster processing for related than for unrelated and less related targets (tonic chord, out-of-key chord, subdominant chord). Comparing targets in baseline contexts with targets in sequences with well-established tonal centers revealed a benefit of processing for related targets but a cost of processing for unrelated and less related targets. Findings are discussed in terms of tonal knowledge activation and suggest that an activated tonal center gives rise to strong expectations for the tonic. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
4.
Wolfgang Tillmann Matthias Manka Lukas Wojarski Michael Holewa 《Science & Technology of Welding & Joining》2020,25(4):290-296
ABSTRACTTools for machining are exposed to high loads, wear, and elevated temperatures. Commonly, such tools consist of cemented carbides and tool steel. To combine the advantages of both materials, high-quality-joints with high strengths are desired. When brazing these materials, the main challenge is the mismatch of the Coefficient of Thermal Expansion (CTE) and the poor wettability of cemented carbides by molten filler alloys. In this regard, the feasibility of two custom-made alloys (CuNi12Si5, CuNi12Si5B0.4) was analysed. Besides being a cost-efficient alternative, these alloys offer the possibility to modify their mechanical properties by precipitation hardening to reduce stresses within the final joints. Thus, this paper shows that a temperature of 1060°C is suitable for wetting and brazing tests on different substrates. 相似文献
5.
X‐ray diffraction (XRD)‐studies on the temperature dependent interface reactions on hafnium,zirconium, and nickel coated monocrystalline diamonds used in grinding segments for stone and concrete machining 下载免费PDF全文
W. Tillmann M. Tolan M. Pinho Ferreira M. Paulus M. Becke D. Stangier 《Materialwissenschaft und Werkstofftechnik》2016,47(12):1193-1201
Diamond impregnated metal matrix composites are the state of the art solution for the machining of mineral materials. The type of interface reactions between the metal matrix and diamond surface has an essential influence on the tool performance and durability. To improve the diamond retention, the diamonds can be coated by physical vapour deposition with metallic materials, which enforce interface reactions. Hence, this paper focuses on the investigation of the interfacial area on metal‐coated monocrystalline diamonds. Hafnium and zirconium, both known as carbide forming elements, are used as coating materials. The third coating, which is used to determine its catalytic influences when applied as a physical vapour deposition (PVD)‐layer, is nickel. Additionally, the coated diamond samples were heat‐treated to investigate the starting point of the formation of new phases. X‐ray diffraction‐analyses revealed the assumed carbide formation on hafnium and zirconium coated samples. The formation temperature was identified between 800 °C and 1000 °C for hafnium and zirconium coatings. 相似文献
6.
7.
A magnetoelectrical resistivity measurement system is proposed, which combines measurement of the electric potential and the magnetic field due to a current injection into a sample. Measurement of the electric potential, as well as the injected current, is similar to traditional electrical resistivity tomography (ERT) data acquisition. For the magnetic field measurements, 24 sensor modules have been developed using three component anisotropic magnetoresistive (AMR) sensors, mounted on a vertically moving scanning torus. The system is designed to operate in a typical laboratory magnetic noise environment without extensive shielding. To compensate for the effects of the Earth's magnetic field, the AMR sensors are operated with a field feedback circuit. Optimal noise reduction is provided by the use of a lock-in frequency of 25 Hz, with sine wave modulation and measurement cycles of 10 s. The resolution of the system is better then 50 pT and the aimed accuracy is 0.1%. The system provides a data set of magnetic fields complimentary to traditional ERT to determine the internal conductivity distribution of cylindrical samples with the dimension of 0.1-m radius and 0.5-m height. 相似文献
8.
A. Elrefaey L. Wojarski W. Tillmann 《Journal of Materials Engineering and Performance》2012,21(5):707-713
Furnace vacuum brazing has been employed to join commercially pure titanium and low carbon steel using copper-based filler
metal with the composition of Cu-10.6Mn-1.9Ni, at.%. Three different brazing temperatures 930, 970, and 1000 °C and a holding
time of 15 min were studied and evaluated. The corrosion behavior of the joint in 0.1 M sulfuric acid was investigated using
immersion and electrochemical tests. Measurements of corrosion potential, corrosion current density, corrosion rate, polarization
resistance, weight loss, and morphology of corrosion attack were used in this study. Experimental results showed that severe
corrosion attack of the steel side at the interfacial area is clearly observed. Despite the difference in corrosion rate values
obtained by electrochemical and weight loss measurements, the trend of results was identical to a large extent. Corrosion
resistance of the joint showed a general tendency to increase with rising brazing temperature. The lowest corrosion rate was
obtained for the couple bonded at 1000 °C. Meanwhile, at the lowest joining temperature of 930 °C, corrosion rate showed a
higher value. The results of joints corrosion resistance were attributed to the difference in microstructure features and
chemical analysis. 相似文献
9.
In this paper we report on a newly developed multi-gate nanowire-field-effect device (NWFET) in which the transistor type (i.e. PMOS and NMOS) is freely selectable by the application of a control-voltage. This significantly adds to flexibility in design of integrated circuits and their fabrication, respectively. We will show, that the use of midgap Schottky-barrier source and drain contacts are the key enabler for this device concept to be functional. A fully functional freely configurable CMOS-NWFET inverter circuit is presented, demonstrating the capability of this SOI technology platform. All this makes the presented NWFET-technology suitable for the fabrication multi-purpose devices for many applications. 相似文献
10.
H. Moll W. Theisen W. Tillmann L. Weber 《Materialwissenschaft und Werkstofftechnik》2005,36(8):365-369
Use of a Scratch Pendulum for Quantification of the Abrasive Behaviour in Machining Stones The machining of natural stones is one of the most demanding applications of today´s cutting technique. Modern stone processing is based on grinding and it is usually done with diamond based tools. The achievable material removal rate is process dependant and mainly determined by tool speed and infeed. The tool durability depends on the adjustment of the parameters to the wear resistance of the processed material. This resistance is a material characteristic value. Using a scratch pendulum, it is possible to determine the energy needed to create a defined scratch and relate it to the induced material loss and the chipped material volume. The analysis provides a value which, after verification by industrial production data, can be seen as characteristic for the material. It therefore enables the quantification of a material dependant scratch resistance. 相似文献