Shearing tests with continuously increasing normal stress

In the conventional shearing tests the normal force or the normal stiffness are kept constant during the experiment. Sliding under constant normal load occurs in slopes if the environment is not changing during the process. The goal of this paper is to investigate the influence of the continuously changing (i.e. increasing) normal load for the continuously increasing shearing load. Cement mortar specimens with triangular teeth that have the same inclination (regular triangular teeth) were used to carry out this research. Both the geometry of the specimens and the mechanical constants were well-known. The "Continuous Failure State" (CFS) shear tests were carried out according to CFS-triaxial tests, with different starting normal stresses. According to the investigations, the behaviour of the material in case of CFS-shearing tests was always different as in case of CFS-triaxial tests. Linear and nonlinear theoretical models are proposed for the measured curves

Influence of the continuously increasing normal stress to the failure in case of shearing test

In a conventional shearing test the normal force or the normal stiffness is kept constant during the experiment. Sliding under constant normal load occurs in slopes if the environment is not changing during the process. The goal of this paper is to investigate the influence of the continuously changing (i.e. increasing) normal load for the increasing shearing load. Regular triangular cement mortar specimens were used to carry out this research. Both the geometry of the specimens and the mechanical constants were well-known. The "Continuous Failure State" (CFS) shear tests were carried out like the ISRM standardized CFS- triaxial tests, with different starting normal stresses. The differences between the analogous CFS triaxial results are discussed and analyzed. Linear and nonlinear theoretical models are proposed

Second law of thermodynamics and the failure of rock materials

The relation of nonequilibrium thermodynamics to some failure and fracture theories of rock mechanics is investigated. The basic concepts are given to connect failure to the properties of material equations describing the elastic properties. The resulted in thermodynamic conditions are proved to be compatible with classical localization and failure theories of solid materials. Compatibility with experiments and some empirical, adhoc failure criteria of rocks is also demonstrated

The Price of Advice

We develop a model of consulting (advising) where the role of the consultant is that she can reveal signals to her client which refine the client’s original private estimate of the profitability of a project. Importantly, only the client can observe or evaluate these signals, the consultant cannot. We characterize the optimal contract between the consultant and her client. It is a menu consisting of pairs of transfers specifying payments between the two parties (from the client to the consultant or vice versa) in case the project is undertaken by the client and in case it is not. The main result of the paper is that in the optimal mechanism, the consultant obtains the same profit as if she could evaluate the impact of the signals (whose release she controls) on the client’s profit estimate.Mechanism Design, Information Disclosure, Consulting, Advising

Service-oriented Context-aware Framework

Location- and context-aware services are emerging technologies in mobile and desktop environments, however, most of them are difficult to use and do not seem to be beneficial enough. Our research focuses on designing and creating a service-oriented framework that helps location- and context-aware, client-service type application development and use. Location information is combined with other contexts such as the users' history, preferences and disabilities. The framework also handles the spatial model of the environment (e.g. map of a room or a building) as a context. The framework is built on a semantic backend where the ontologies are represented using the OWL description language. The use of ontologies enables the framework to run inference tasks and to easily adapt to new context types. The framework contains a compatibility layer for positioning devices, which hides the technical differences of positioning technologies and enables the combination of location data of various sources

Közeledés vagy távolodás?

Az Európai Unióhoz való csatlakozást megelőző mintegy másfél évtizedben, kivált a csatlakozási kérelem 1994. évi benyújtásától a tagságig elvezető tíz évben Magyarország gyorsuló ütemben zárkózott fel az EU formális, főleg jogi és intézményi normákban megfogalmazott követelményrendszeréhez. Ezt nem csak a közelgő tagsággal járó kötelezettségek kényszerítették ki, a folyamatot az ország visszanyert önrendelkezésének felszabadult, olykor euforikus hangulata is motiválta. Ritka és széles nemzeti egység övezte a visszatérés lépéseit ahhoz a civilizációs modellhez, amelyet az ország kisebb-nagyobb távolságból egy évezred óta próbált követni. Ezzel szemben a 2004. évi belépés után, különféle belső és külső okok következtében, Magyarország távolodni kezdett attól az „európai” értékrendtől, amelyet az EU kodifikált és érvényesít. Az Unió centrumához fűződő viszonyunkban a csatlakozást követő évtized éppen ellenkező irányú fejlődést hozott, mint a belépést megelőző, ugyancsak kulcsfontosságú tízéves időszak. Ez a kontrasztos kép ellentmond az előzetes várakozásoknak, és azt mutatja, hogy a belpolitika éppenséggel megfordítva működött (és működik), mint amit a külső mozgástér adottságai (lehetőségei és korlátai) indokolnának. A szerző az EU-tagság tízéves fordulójáról visszatekintve e jelenség egyes okaira próbál rávilágítani. Journal of Economic Literature (JEL) kód: F15, F50, N44

Eccentric first post-Newtonian waveforms for compact binaries in frequency domain with Hansen coefficients

The inspiral and merger of supermassive black hole binary systems with high orbital eccentricity are among the promising sources of the advanced gravitational wave observatories. In this paper we derive analytic ready-to-use first post-Newtonian eccentric waveform in Fourier domain with the use of Hansen coefficients. Introducing generic perturbations of celestial mechanics we have generalized the Hansen expansion to the first post-Newtonian order which are then used to express the waveforms. Taking into account the high eccentricity of the orbit leads to the appearance of secular terms in the waveform which are eliminated with the introduction of a phase shift. The waveforms have a systematic structure and as our main result these are expressed in a tabular form.Comment: 19 pages, 3 figure