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排序方式: 共有164条查询结果,搜索用时 31 毫秒
31.
Daniela Graf Stillfried Martti Toivakka Parvez Alam 《Journal of Materials Science》2013,48(24):8449-8453
This brief communication describes the application and utility of thin film coral-mimetic coatings to natural fibres and provides quantitative values for the actual enhancement of their flexural properties. 相似文献
32.
A systematic analysis of trace- and failure-based compositional semantic models for Basic LOTOS is presented. The analysis is motivated by the fact that the weakest known equivalences preserving sufficient information for several typical verification tasks are failure-based, and the weakness of an equivalence can be advantageous for verification. Both the equivalences and the preorders corresponding to the semantic models are covered. The analysis yields in a natural way two compositional semantic models, which are particularly suited for the verification of a general class of liveness properties, a task which cannot be performed with most established models. 相似文献
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34.
Parsing can be applied to compress source programs. A suitably encoded parse tree, together with the symbol table, constitutes a very compact representation of the program. The paper reports a Prolog implementation of the method, including automatic, syntax-directed, encoder and decoder generators. The test results show compression gains of 50–60 per cent. 相似文献
35.
Martti Kauranen Thierry Verbiest Sven van Elshocht Andr Persoons 《Optical Materials》1998,9(1-4):286-294
The efficiency of second-harmonic generation from chiral surfaces and thin films is different for left- and right-hand circularly-polarized fundamental light. Such optical activity can occur in the electric-dipole approximation. However, to explain our results for chiral polymer films, magnetic contributions to the nonlinearity must be included. A technique that uses a quarter wave plate to continuously vary the polarization of the fundamental beam was used to determine the relative complex values of the components of the tensors that characterize the nonlinear interaction. The largest magnetic components were 20% of the largest electric components. Second-harmonic generation from achiral anisotropic surfaces can also lead to optical activity. This occurs if the orientation of the anisotropic sample makes an otherwise achiral experimental arrangement chiral. The effect occurs in the electric-dipole approximation and changes sign as the handedness of the setup is reversed. 相似文献
36.
Prevailing trend in design of chip multiprocessors (CMP) has been that single-core processors are replicated. Therefore, they typically define asynchronous computational model, require heavily locality-aware memory allocation, and present high overheads in intercommunication. This kind of properties make parallel programming very challenging and prone to errors. We introduce our new dual-mode MultiBunched/Threaded Architecture with Chaining (MBTAC) processor core, the main building block of the REPLICA CMP. It provides a modern, sophisticated way for writing general purpose parallel programs backed up by native execution capabilities/realization of key concepts. These include support for cost-efficient machine instruction-level synchronization and uniform shared global memory for enabling easy-to-program memory allocation of data structures and data movement. MBTAC makes use of low-overhead thread-context switching solution; it has parallel computing savvy functional unit organization to exploit inter-thread instruction-level parallelism and highly efficient multioperations. To evaluate the goodness of our proposal, we implemented three MBTAC constellations featuring up to 2048 parallel threads on FPGA, compared it with respect to DLX and Intel’s Core i7 processors. The results point toward high performance in communication-intensive problems, simplified parallel programmability, and regular, implementation-friendly structure. 相似文献
37.
Forsell Martti Nikula Sara Roivainen Jussi Leppänen Ville Träff Jesper Larsson 《The Journal of supercomputing》2022,78(3):3152-3183
The Journal of Supercomputing - Commercial multicore central processing units (CPU) integrate a number of processor cores on a single chip to support parallel execution of computational tasks.... 相似文献
38.
The comparison of particle oxidation and surface structure of diesel soot particles between fossil fuel and novel renewable diesel fuel 总被引:1,自引:0,他引:1
Matti Happonen Tero Lähde Maria E. Messing Teemu Sarjovaara Martti Larmi L. Reine Wallenberg Annele Virtanen Jorma Keskinen 《Fuel》2010,89(12):4008-4013
Conventional fossil diesel fuel and renewable diesel fuel based on hydrotreated vegetable oils (HVO) were compared regarding the oxidation characteristics of the generated soot particulate. The comparison was performed by utilizing a high-temperature oxidation tandem differential mobility analyser in which monodisperse soot aerosol was first selected and then heated in a high-temperature furnace. The particle size reduction caused by oxidation during the furnace treatment was then measured as a function of furnace temperature. The results indicate that soot oxidation is very similar between the studied fuels. This is supported by the obtained HR-TEM images and EELS-spectra which were practically indistinguishable between different fuels and engine conditions. The similar oxidation properties and surface structure between fossil and HVO-based diesel fuels imply that the oxidative aftertreatment devices designed for fossil diesel should work well also with the studied renewable diesel fuel. 相似文献
39.
Devices measuring pressure, temperature and humidity simultaneously are known as PTU devices. There are hardly any commercial calibration systems for the PTU devices available for low temperatures (<0 °C). To obtain more comprehensive data on the performance of PTU devices, a new calibration system is developed at MIKES. In this PTU Apparatus, pressure, temperature and humidity can be controlled simultaneously so that all combinations over the ranges are possible. The nominal ranges of the system are the following: absolute pressure 500–1100 hPa, temperature −52 °C to +80 °C and relative humidity 10–95%. The target uncertainties (k = 2) of the pressure, temperature and humidity are 10 Pa, 0,1–0,3 °C and 1–3% RH, respectively. The construction and operation as well as the results of operational tests of the PTU Apparatus are reported in this paper. 相似文献
40.
IR-sintering of ink-jet printed metal-nanoparticles on paper 总被引:1,自引:0,他引:1
Daniel Tobjörk Harri Aarnio Petri Pulkkinen Roger Bollström Anni Määttänen Petri Ihalainen Tapio Mäkelä Jouko Peltonen Martti Toivakka Heikki Tenhu Ronald Österbacka 《Thin solid films》2012,520(7):2949-2955
Sintering of printed metal nanoparticles can be made not only by conventional heating, but also by, e.g., electrical, microwave, plasma, laser and flash lamp annealing. We demonstrate sintering by using low-cost incandescent lamps as an effective way of obtaining highly conductive contacts of two types of ink-jet printed metal-nanoparticle inks on paper; both alkanethiol protected gold nanoparticles and a commercially available silver nanoparticle ink. This low-cost roll-to-roll compatible sintering process is especially suitable on paper substrates because of the high diffuse reflectance, relatively high thermal stability and low thermal conductivity of paper. A volume resistivity of around 10 μΩ cm was achieved of the inkjetted silver nanoparticles within 15 s of exposure to an IR lamp, which corresponds to a conductivity of 10-20% of that of bulk silver. Too long exposure time and too high intensity, however, lead to darkening of the paper fibers. Both the crack formation and the coffee ring effect of the inkjet printed gold nanoparticles were, furthermore, found to be reduced on paper as compared to glass or plastic substrates. 相似文献