http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Jakub Ederer,Adam Novák,Pavel Janoš,Martin Štastny,Jirí Henych,Matouš Bárta,Petr Ryšánek,Jakub Tolasz 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.123 No.-
Nanocrystalline cerium oxide (CeO2) was used as an effective catalytic and adsorption material for thesafe removal of selected phosphorus compounds. Several CeO2 samples were prepared by a simple coprecipitationmethod with subsequent annealing at temperatures between 400–600 C, and their sorptionability for inorganic phosphates was studied together with their ability to decompose the organophosphoruscompound - paraoxon methyl (PO) - with the goal to find the relations between the sorptionand catalytic activity of the prepared materials. It was found that a complex set of physical and chemicalcharacteristics (surface area, crystallite size, pore volume/size, the number of surface hydroxyl groups)plays a crucial role in the governing of adsorption ability and catalytic activity. From the dependenceof some characteristics (i.e., the number of surface hydroxyl groups, BET surface area, crystallite size)on the annealing temperature and their mutual correlations, the model describing the degradation oforganophosphate compounds on the surface of cerium oxide was deduced.
Inhomogeneity of CoCrW powder products manufactured by SLM technology
Anna Guzanová,Dagmar Draganovská,Gabriela Ižaríková,Janette Brezinová,Viktória Rajťúková,Jozef Živčák,Radovan Hudák,Erik Janoško,Róbert Moro 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.10
The article deals with selective laser melting process using CoCrW powder. Our aim was to identify the influence of product position on the building platform and the re-use of powder on roughness, hardness, porosity and corrosion properties of materials, made under uniform process parameters. Roughness was tested with a stylus profilometer, corrosion resistance by electrochemical impedance spectroscopy and linear polarization. Porosity was assessed by image analysis on metallographic sections taken in two mutually perpendicular directions. The same metallographic sections were used to measure microhardness. The results confirmed a statistically significant dependence of the surface roughness with the position on the platform as well as with the recycling of the powder used. The corrosion resistance of the materials was excellent. Increased porosity values and lower hardness occurred in the middle of the building platform. The reason for the variation of the properties within the building platform can be seen in the unequal laser input energy in the individual positions of the plate.
Extension of Operational life-time of WWER-440/213 type units at Paks Nuclear Power Plant
TAMAS JANOS KATONA,SANDOR RATKAI 한국원자력학회 2008 Nuclear Engineering and Technology Vol.40 No.4
Operational license of WWER-440/213 units at Paks NPP, Hungary is limited to the design lifetime of 30 years. Prolongation by additional 20 years of the operational lifetime is feasible. Moreover, enhancement of the reactor thermal power by 8% will increase both the net power output and the competitiveness of the plant. Paks NPP is a pioneer considering the power up-rate and preparation of long-term operation of WWER-440/213 design. Systematic preparatory work for longterm operation of Paks NPP has been started in 2000. A regulatory framework and a comprehensive engineering practice have been developed. According to the authors view, creation of a gapless engineering system via consequent application of best practices, and feed-back of experiences together with proper consideration of WWER-440/V213 features are the decisive elements of ensuring the safety of long-term operation. That systematic engineering approach is in the focus of recent paper. Key elements of justification and measures for ensuring the safety of long-term operation of Paks NPP WWER-440/213 units are identified and discussed. These are the assessment of plant condition and review of adequacy of ageing management programmes, also the review, validation and reconstitution of time limited ageing analyses as core tasks of licence renewal.
Dynamic Survivable Routing for Shared Segment Protection
Tapolcai, Janos,Ho, Pin-Han The Korea Institute of Information and Commucation 2007 Journal of communications and networks Vol.9 No.2
This paper provides a thorough study on shared segment protection (SSP) for mesh communication networks in the complete routing information scenario, where the integer linear program (ILP) in [1] is extended such that the following two constraints are well addressed: (a) The restoration time constraint for each connection request, and (b) the switching/merging capacity constraint at each node. A novel approach, called SSP algorithm, is developed to reduce the extremely high computation complexity in solving the ILP formulation. Basically, our approach is to derive a good approximation on the parameters in the ILP by referring to the result of solving the corresponding shared path protection (SPP) problem. Thus, the design space can be significantly reduced by eliminating some edges in the graphs. We will show in the simulation that with our approach, the optimality can be achieved in most of the cases. To verify the proposed formulation and investigate the performance impairment in terms of average cost and success rate by the additional two constraints, extensive simulation work has been conducted on three network topologies, in which SPP and shared link protection (SLP) are implemented for comparison. We will demonstrate that the proposed SSP algorithm can effectively and efficiently solve the survivable routing problem with constraints on restoration time and switching/merging capability of each node. The comparison among the three protection types further verifies that SSP can yield significant advantages over SPP and SLP without taking much computation time.