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排序方式: 共有96条查询结果,搜索用时 15 毫秒
1.
Mieczyslaw Korzynski Tomasz Zarski Katarzyna Korzynska 《Journal of Materials Processing Technology》2011,211(12):1982-1988
The present work compares the states of the surface textures and the oscillatory fatigue strengths of specimens made of an AZ91 alloy after turning and dynamic bearing ball peening. It was found that the specimens ball peened at different time have similar surface geometric structure parameters but different strengthening intensity. It was shown that fatigue strength follows greater peening intensity and random and isotropic surface. It was also ascertained that improving (by peening) the condition of the surface layer means enhancing fatigue strength by 20–87% compared with turning. 相似文献
2.
Sule O. Ibraheem Mieczyslaw M. Kokar Lundy Lewis 《Journal of Network and Systems Management》1998,6(4):429-449
This paper describes a method for constructingbehavior models of communication networks. The methodutilizes archived quantitative performance data createdby a network management platform to create a Quantitative/Qualitative (Q2)Dynamic System representation. The Q2representation captures the predominant qualitative(symbolic) states of the network, qualitative inputevents and transitions among the states resulting from these events. Thissymbolic model allows the network manager to understandthe current system behavior, and predict future possiblebehaviors. We evaluated the method on two sets of archive data. The method shows promise foruse in network management, including network monitoring,fault detection, prognostication andavoidance. 相似文献
3.
The goal of the research presented in this paper was to study a new software paradigm – adaptive software – in which the structure of an adaptive program is patterned upon the structure of an adaptive controller. Towards this aim, we implemented a domain-specific (object/target recognition) program (A Reconfigurable Architecture for Adapting to Changes in the Requirements (RAACR)) that can adapt to changes in software requirements through the incorporation of feedback. RAACR is a hierarchy of domains (blackboards). Each domain includes multiple knowledge sources (KSs) and a domain scheduler (DS). In response to feedback, KSs change their processing parameters, while DSs change the scheduling policy of the KSs. A generic communication mechanism is implemented on the CORBA compliant SPRING operating system. The adaptability of the program is evaluated quantitatively using a requirements volatility measure and the probability of correct recognition. 相似文献
4.
Defect Chemistry of (La,Sr)MnO3 总被引:1,自引:0,他引:1
Defect-disorder models are derived for undoped and strontium-doped LaMnO3 . A random-defect model and a cluster-defect model are both considered within the regimes that correspond to oxygen deficit and oxygen excess. The models are constructed based on the experimental nonstoichiometry data that was reported by previous researchers. According to both models, the addition of strontium leads to an increase of the concentration of electron holes and oxygen nonstoichiometry. The defect clusters that are predicted by the cluster model have a marked concentration only at very low oxygen partial pressures. Both models are verified against the electrical-conductivity data. A good agreement between the random-defect model and the experimental data is shown. 相似文献
5.
Anna Domagala Wojciech Domagala Przemyslaw Ledwon Marta Musiol Henryk Janeczek Agnieszka Stolarczyk Piotr Kurcok Grazyna Adamus Mieczyslaw Lapkowski 《Polymer International》2016,65(12):1395-1404
New copolymer materials have been prepared by chemical grafting of oligomeric 3‐hydroxybutyric acid (OHB) onto polypyrrole (PPy) derivatives. The influence of grafting density and molecular weight of OHB brushes on the physicochemical properties of prepared copolymers was investigated. PPy substrates were prepared by FeCl3‐driven oxidative homopolymerization of N‐(2‐carboxyethyl)pyrrole or its copolymerization with pyrrole. The grafting method employed involved controlled anionic polymerization of β‐butyrolactone on pyrrole‐tethered potassium carboxylate active sites. Obtained PPy‐g‐OHB copolymers of varying grafting density and pendant polyester chain length were characterized and the observed structure–property relationships discussed. The impact of real time exposure to phosphate‐buffered saline environment was investigated and the residue products were characterized. Cross‐correlation of spectroscopic, thermal, electrical and elemental analysis data afforded comprehensive evaluation of the structure of prepared materials and their behaviour in hydrolytic medium. Erosion and degradation pathways have been identified, indicating ways to consciously tailor the physicochemical properties of these new biomimetic materials. © 2016 Society of Chemical Industry 相似文献
6.
Mieczyslaw Szyszkowicz 《Computer Graphics Forum》1991,10(1):67-70
In this note we propose a new technique for execution of the feedback process z → z2 + c . The presented method is used to discover a family of sets in the complex plane. 相似文献
7.
The defect structure model in the wustite phase is considered involving the 4:l cluster as a basic defect structure unit. Interactions between defects are considered in terms of the Debye-Hückel theory for strong electrolytes. It has been shown that the available data on wustite nonstoichiometry fit well the 4:l cluster model. Above 1173 K the degree of ionization of the cluster is −5. The equilibrium constant of the cluster formation determined in this work is K c = [(( V Fe )4 Fe i )5− ][h]5 [FeFe ]−6 [V i ]−1 PO2 −3/2 f 6 ± = 1.07 × 10−14 exp[396.7 (kJ)/ RT ]. The equilibrium constant is quite consistent with such thermodynamic parameters as partial molar enthalpy and entropy of oxygen in Fe1- y O within the entire stability range of the wustite phase. 相似文献
8.
Mieczyslaw Witold Krasny 《Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment》2005,540(2-3):222-234
A method of delivering a small energy spread electron beam to the LHC interaction points is proposed. In this method, heavy ions are used as carriers of projectile electrons. Acceleration, storage and collision-stability aspects of such a hybrid beam is discussed and a new beam-cooling method is presented. This discussion is followed by a proposal of the Parasitic Ion–Electron collider at LHC (PIE@LHC). The PIE@LHC provides an opportunity, for the present LHC detectors, to enlarge the scope of their research program by including the program of electron–proton and electron–nucleus collisions with minor machine and detector investments. 相似文献
9.
M. F. Zhou T. Bak J. Nowotny M. Rekas C. C. Sorrell E. R. Vance 《Journal of Materials Science: Materials in Electronics》2002,13(12):697-704
The present paper considers the effect of oxygen partial pressure on the presence of point defects in calcium titanate (CaTiO3) at elevated temperatures at which a gas/solid equilibrium is reached. Defect models of undoped (CaTiO3) are considered within several regimes of oxygen partial pressures involving (i) extremely reducing conditions, (ii) reducing conditions, and (iii) oxidizing conditions, which are described by different charge-neutrality conditions. The mechanism of donor incorporation is considered in terms of both ionic and electronic charge compensation. It is shown that electronic and ionic charge compensations prevail at low and high p(O2), respectively. 相似文献
10.
Mieczyslaw Korzynski 《Journal of Materials Processing Technology》2009,209(1):131-138
The article describes how to obtain regular depressions in hole surfaces by means of eccentric burnishing. The principle of the method was explained and the mathematical formulae showing the relations among the process parameters were derived. A formula enabling the choice of the rotational speed of the burnishing head with regard to the (required) machining trace coverage of the surface was given. The structure of a head used for eccentric burnishing of bearings sleeves was described. Experiments checking the possibility of making various reliefs confirmed the practical application of the head. The investigation of the extent of tribological wear of steel/steel and steel/bronze sliding contacts were carried out. It showed explicitly that the specimen with oil pockets obtained by eccentric burnishing show much less wear than diamond turned ones. 相似文献