Search results for "force"
showing 10 items of 3423 documents
Social Networks and Labour–Education Market System
2015
Two facts about human beings are widely accepted: they are social creatures and they behave in a bounded rational way. In particular, this results in substantial use of social networks in individual decision-making. Before dealing with the issues of modelling individual behaviour in the labour–education market system, we have to recall some empirical facts known from the literature about this behaviour. This is exactly what this chapter provides.
Observation of Knudsen effect with microcantilevers
2003
The Knudsen effect is estimated theoretically and observed experimentally using a U-shaped silicon microcantilever. Though Knudsen forces are extremely small in most cases involving microcantilevers, there exist situations where these forces can be significant and may be important in atomic force microscopy and in microelectromechanical systems (MEMS). The criteria for the presence of Knudsen forces are outlined and an analytical expression in the form of a linear function of the pressure is given for the force in the free molecular regime. The experimental results display peaks in the transitional regime while varying linearly in the molecular regime.
First images obtained in the near infrared spectrum with the photon scanning tunneling microscope
1993
Abstract First images obtained in the near infrared spectrum with a photon scanning tunneling microscope are presented. The intensity of the light collected by the fibertip, at λ = 1.3 λm , which is a function of the separation between the tip and the sample surface is in agreement with that predicted by the theory. Images of quartz and silicon oxide are presented and the latter is compared with that obtained by an atomic force microscope.
The Territorial Defense Force in the fight against terrorism – institutional and legal issues
2020
The Territorial Defense Force is of great interest to politicians, the media and public opinion. A great deal of misinformation and misconceptions have arisen about the subject related to the newly created type of the Polish Armed Forces. Therefore, the aim of the article is to familiarize the reader with the role, place and tasks of the Territorial Defense Force in the national system of combating terrorism based on the provisions of the law in force in Poland. The article attempts to determine the opportunities and threats under the provisions of the Act on Anti-Terrorism of June 10, 2016, and the Act amending the Act on the Universal Obligation to Defend the Republic of Poland and certai…
Experiments on jets released in rotating vegetated flows
2020
The mixing and spreading of rivers and wastewater flowing into lakes and coastal waters have a great impact in presence of vegetation canopies and mussel coltivation farms.
Moc wiążąca uchwał Sądu Najwyższego in concreto w sprawach karnych
2020
Przedmiotem opracowania jest problematyka mocy wiążącej uchwał Sądu Najwyższego podejmowanych w konkretnych sprawach karnych. Podstawę prawną do podejmowania tych uchwał stanowią przepisy art. 441 k.p.k. i art. 82 ustawy z dnia 8 grudnia 2017 r. o Sądzie Najwyższym. Według art. 441 § 1 k.p.k. jeżeli przy rozpoznawaniu środka odwoławczego wyłoni się zagadnienie wymagające zasadniczej wykładni ustawy, sąd odwoławczy może odroczyć rozpoznanie sprawy i przekazać zagadnienie prawne do rozstrzygnięcia Sądowi Najwyższemu, ten zaś może również przekazać rozstrzygnięcie zagadnienia prawnego powiększonemu składowi tego sądu (arg. ex art. 441 § 2 k.p.k.). Uchwała Sądu Najwyższego jest w danej sprawi…
Effect of clenching on biomechanical response of human mandible and temporomandibular joint to traumatic force analyzed by finite element method
2013
Purpose: The purpose of the present study was to analyze the effect of clenching on the biomechanical response of human mandible and temporomandibular joint (TMJ) to traumatic force by the finite element (FE) method. Material and Methods: FE models of the mandible and the TMJ in resting and clenching positions were prepared. Distribution and magnitude of von Mises stress were analyzed by applying force as a point load in the symphyseal, canine, body and angle regions of the mandible. In addition, strain energy density (SED) at the articular disc and in posterior connective tissue of TMJ was analyzed. Results: In the resting position, von Mises stress was mainly concentrated at the condylar …
A laboratory comparison of Individual Targis/Vectris posts with standard fiberglass posts
2007
This article presents an in vitro analysis of a specific occlusal loading test on endodontically treated teeth restored with 2 different composite post materials. Individual, customized posts (IFPs) were compared to standard fiberglass posts (SFPs). The selected IFPs (standard cylindric Targis/Vectris posts) were compared to SFPs (Conic 6% Post, Ghimas). The posts were first subjected to a 3-point bending test to compare their flexural elastic properties. They were then used to restore 22 endodontically treated artificial maxillary central incisors and subjected to a specific occlusal loading simulation test. The loading test showed that IFP restorations performed better than SFP restoratio…
Porphyrin-templated synthetic G-quartet (PorphySQ): a second prototype of G-quartet-based G-quadruplex ligand.
2012
Template-assembled synthetic G-quartet (TASQ) has been reported recently as a G-quadruplex ligand interacting with DNA according to an unprecedented, nature-inspired ‘like likes like’ approach, based on the association between two G-quartets, one being native (quadruplex) and the other one artificial (ligand). Herein, a novel TASQ-based ligand is designed, synthesized and its quadruplex-recognition properties are evaluated in vitro: PorphySQ (for porphyrin-templated synthetic G-quartet) displays enhanced quadruplex recognition properties as compared to the very first reported prototype (DOTASQ, for DOTA-templated synthetic G-quartet), since the porphyrin template insures a more stable intra…
Effect of cholesterol on the physical properties of pulmonary surfactant films: Atomic force measurements study
2006
International audience; Atomic force measurements were performed on supported pulmonary surfactant (PS) films to address the effect of cholesterol on the physical properties of lung surfactant films. We recently found that cholesterol in excess of a physiological proportion abolishes surfactant function, and is the reason that surfactant fails to lower the surface tension upon compression. In this study, we investigated how the loss of mechanical stability observed earlier is related to the local mechanical properties of the film by local force measurements. The presence of 20% of cholesterol in bovine lipid extract surfactant (BLES) resulted in a decrease of the observed adhesive interacti…