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排序方式: 共有933条查询结果,搜索用时 109 毫秒
121.
Tomczak Jakub M. Zaręba Szymon Ravanbakhsh Siamak Greiner Russell 《Neural Processing Letters》2019,50(2):1401-1419
Neural Processing Letters - This paper introduces a new approach to maximum likelihood learning of the parameters of a restricted Boltzmann machine (RBM). The proposed method is based on the... 相似文献
122.
Self-organization of colloidal particles during drying of a droplet: Modeling and experimental study
Katarzyna Jabłczyńska Jakub M. Gac Tomasz R. Sosnowski 《Advanced Powder Technology》2018,29(12):3542-3551
Formation of structurized micro/nanoparticle aggregates in spray drying process is analyzed theoretically and experimentally. Colloids of mono- and bimodal particle size distribution are used as the precursors to demonstrate different patterns of particle self-organization inside the drying droplet. In case of monodisperse primary particles their self-organization in the final aggregate results in either a hollow or a full (packed) spherical structure. For primary particles with bimodal size distribution, either the layered structure of aggregates is formed (with smaller particles forming outer layer and the bigger particles captured inside) or the ordering of bigger particles on the aggregate surface is observed, depending on process parameters. Numerical investigations allow to predict and explain the conditions at which self-assembling of particles within powder aggregates takes place. 相似文献
123.
Zhijie Zhu Shuang‐Zhuang Guo Tessa Hirdler Cindy Eide Xiaoxiao Fan Jakub Tolar Michael C. McAlpine 《Advanced materials (Deerfield Beach, Fla.)》2018,30(23)
Conventional 3D printing technologies typically rely on open‐loop, calibrate‐then‐print operation procedures. An alternative approach is adaptive 3D printing, which is a closed‐loop method that combines real‐time feedback control and direct ink writing of functional materials in order to fabricate devices on moving freeform surfaces. Here, it is demonstrated that the changes of states in the 3D printing workspace in terms of the geometries and motions of target surfaces can be perceived by an integrated robotic system aided by computer vision. A hybrid fabrication procedure combining 3D printing of electrical connects with automatic pick‐and‐placing of surface‐mounted electronic components yields functional electronic devices on a free‐moving human hand. Using this same approach, cell‐laden hydrogels are also printed on live mice, creating a model for future studies of wound‐healing diseases. This adaptive 3D printing method may lead to new forms of smart manufacturing technologies for directly printed wearable devices on the body and for advanced medical treatments. 相似文献
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Artur Mościcki Jakub Pawlicki Dominik Głowacki Karol Suprynowicz 《Journal of Materials Science》2018,53(24):16220-16231
Foamed glass is widely used in the industry as an insulating material. However, its mechanical properties are not well-investigated yet. Foamed glass is produced from glass waste that causes discrepancy in mechanical properties of the final product. This paper shows a way to increase the limit of the load capacity of foamed glass, which is very fragile and sensitive to mechanical and thermal loading conditions. In this paper, three different methods of load application on cellular glass structure (rough contact, resin and flour interfaces) and their influence on failure mechanisms were investigated in detail. The results of numerical analyses, based on finite elements method and compression strength tests using the digital image correlation method, indicate that the overall strength of the material is limited by boundary effects. A careful adjustment of the interface property is the main factor to draw useful conclusions and to extend load limits of cellular glass in engineering applications. 相似文献
126.
Emanuel Airton de Oliveira Farias Silvania Siqueira Nogueira Aline Márcia de Oliveira Farias Monialine Sousa de Oliveira Maria de Fátima Cardoso Soares Helder Nunes da Cunha José Ribeiro dos Santos Junior Durcilene Alves da Silva Peter Eaton Carla Eiras 《Journal of Materials Science》2017,52(23):13365-13377
In this work, we report the production of a layer-by-layer (LbL) film of gold nanoparticles stabilized with carrageenan (carr-AuNPs) interspersed with a conductive polyaniline (PANI) layer. Conventionally, PANI has poor electroactivity in physiological buffers, limiting its using in electrochemical biosensors. The films were prepared on low cost and easy to manufacture flexible gold electrodes (FEAu). Two adsorption sequences were tested for production of the films—PANI/carr-AuNP and carr-AuNP/PANI. The gold nanoparticle size and colloidal stability were characterized. The films were characterized by cyclic voltammetry, UV–visible spectroscopy and atomic force microscopy. The results showed the synergistic effects of the carr-AuNPs (120 nm) and PANI, which improved both the electrochemical response and the stability of the conductive polymer in physiological medium by three times. The presence of the carr-AuNPs in the film caused a significant increase in roughness of the FEAu-modified electrode compared to that of an unmodified electrode, resulting in an increased active electrode area. Studies of film growth by UV–Vis spectroscopy indicated that the deposition mechanisms of both films involved an auto-regulating adsorption process, with the same amount of material adsorbed in each coating step. The PANI/carr-AUNP film showed considerable improvement in stability and conductivity compared to PANI-only films in the physiological environment, which confers advantages for use as a biosensor. 相似文献
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Imrich Gablech Jakub Somer Zdenka Fohlerová Vojtěch Svatoš Jan Pekárek Stanislav Kurdík Jianguo Feng Peter Fecko Pavel Podešva Jaromír Hubálek Pavel Neužil 《Microfluidics and nanofluidics》2018,22(9):105
We developed an advanced method for fabricating microfluidic structures comprising channels and inputs/outputs buried within a silicon wafer based on single level lithography. We etched trenches into a silicon substrate, covered these trenches with parylene-C, and selectively opened their bottoms using femtosecond laser photoablation, forming channels and inputs/outputs by isotropic etching of silicon by xenon difluoride vapors. We subsequently sealed the channels with a second parylene-C layer. Unlike in previously published works, this entire process is conducted at ambient temperature to allow for integration with complementary metal oxide semiconductor devices for smart readout electronics. We also demonstrated a method of chip cryo-cleaving with parylene presence that allows for monitoring of the process development. We also created an observation window for in situ visualization inside the opaque silicon substrate by forming a hole in the parylene layer at the silicon backside and with local silicon removal by xenon difluoride vapor etching. We verified the microfluidic chip performance by forming a segmented flow of a fluorescein solution in an oil stream. This proposed technique provides opportunities for forming simple microfluidic systems with buried channels at ambient temperature. 相似文献
130.
Modifications to a finite element program developed in a prior study were extended for an initial-strain analysis of horizontal bending moments and hoop tension developed during bisymmetrical eccentric discharge. The results obtained by the newly developed initial-strain method, by the prior study, and those required by ACI Standard 313-77, were compared for a circular concrete silo.Although a significant difference in bending moment was obtained by the initial-strain and linear analysis methods, the steel reinforcement required was nearly the same at the lower elevation. However, at the upper elevation, approximately 50% more reinforcement was required for the initial-strain analysis. The reinforcement required by ACI Standard 313-77 was comparable to that for the initial-strain method at the higher elevation, and greater for the lower elevation. 相似文献