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Search Results: 1 - 10 of 216 matches for " Nemanja "
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Challenging the Cosmological Constant
Kaloper, Nemanja
High Energy Physics - Phenomenology , 2007, DOI: 10.1016/j.physletb.2007.07.061
Abstract: We outline a dynamical dark energy scenario whose signatures may be simultaneously tested by astronomical observations and laboratory experiments. The dark energy is a field with slightly sub-gravitational couplings to matter, a logarithmic self-interaction potential with a scale tuned to $\sim 10^{-3} {\rm eV}$, as is usual in quintessence models, and an effective mass $m_\phi$ influenced by the environmental energy density. Its forces may be suppressed just below the current bounds by the chameleon-like mimicry, whereby only outer layers of mass distributions, of thickness $1/m_\phi$, give off appreciable long range forces. After inflation and reheating, the field is relativistic, and attains a Planckian expectation value before Hubble friction freezes it. This can make gravity in space slightly stronger than on Earth. During the matter era, interactions with nonrelativistic matter dig a minimum close to the Planck scale. However, due to its sub-gravitational matter couplings the field will linger away from this minimum until the matter energy density dips below $\sim 10^{-12} {\rm eV}^4$. Then it starts to roll to the minimum, driving a period of cosmic acceleration. Among the signatures of this scenario may be dark energy equation of state $w \ne -1$, stronger gravity in dilute mediums, that may influence BBN and appear as an excess of dark matter, and sub-millimeter corrections to Newton's law, close to the present laboratory limits.
A New Dimension Hidden in the Shadow of a Wall
Kaloper, Nemanja
High Energy Physics - Phenomenology , 2007, DOI: 10.1016/j.physletb.2007.06.054
Abstract: We propose a new way to hide the fifth dimension, and to modify gravity in the far infra-red. A gravitating tensional membrane in five dimensions folds the transverse space into a truncated cone, stoppered by the membrane. For near-critical tension, the conical opening is tiny, and the space becomes a very narrow conical sliver. A very long section, of length comparable to the membrane radius divided by the remaining conical angle, of this sliver is well approximated by a narrow cylinder ending on the membrane. Inside this cylindrical throat we can reduce the theory on the circle. At distances between the circle radius and the length of the cylinder, the theory looks 4D, with a Brans-Dicke-like gravity, and a preferred direction, while at larger distances the cone opens up and the theory turns 5D. The gravitational light scalar in the throat can get an effective local mass term from the interplay of matter interactions and quantum effective potentials on the cone, which may suppress its long range effects. We discuss some phenomenologically interesting consequences.
Hollywood industry: Correlation between film production and political discourse
Zvijer Nemanja
Sociologija , 2005, DOI: 10.2298/soc0501045z
Abstract: The paper focuses on the relation between Hollywood industry and political establishment of the USA, particularly US foreign policy and the military intervention as its specific form. Only the biggest and the most significant US military interventions were considered: World War Two, Korean War, Vietnam War, military interventions in Latin America, in the Middle East, Asia, Africa and on Balkan, concerning their treatment in Hollywood movies without analyzing them in broader socio-political context. In addition, the anticommunism in Hollywood is also considered, which was perhaps the most perennial content of the US foreign policy.
Effect of recasting on the elastic modulus of metal-ceramic systems from nickel-chromium and cobalt-chromium alloys
Mirkovi? Nemanja
Vojnosanitetski Pregled , 2007, DOI: 10.2298/vsp0707469m
Abstract: Background/Aim. Elastic modulus of metal-ceramic systems determines their flexural strength and prevents damages on ceramics during mastication. Recycling of basic alloys is often a clinical practice, despite the possible effects on the quality of the future metal-ceramic dentures. This research was done to establish recasting effects of nickel-chromium and cobalt-chromium alloys on the elastic modulus of metalceramic systems in making fixed partial dentures. Methods. The research was performed as an experimental study. Six metal-ceramic samples of nickel-chromium alloy (Wiron 99) and cobalt-chromium alloy (Wirobond C) were made. Alloy residues were recycled through twelve casting generations with the addition of 50% of new alloy on the occasion of every recasting. Three- point bending test was used to determine elastic modulus, recommended by the standard ISO 9693:1999. Fracture load for damaging ceramic layer was recorded on the universal testing machine (Zwick, type 1464), with the speed of 0,05 mm/min. Results. The results of this research revealed significant differences between elasticity modules of metal-ceramic samples in every examined recycle generation. Recasting had negative effect on the elastic modulus of the examined alloys. This research showed the slight linear reduction of elastic modulus up to the 6th generation of recycling. After the 6th recycling there was a sudden fall of elastic modulus. Conclusion. Recasting of nickelchromium and cobalt-chromium alloys is not recommended because of the reduced elastic modulus of these alloys. Instead of reusing previously recasted alloys, the alloy residues should be returned to the manufacturer. .
Mechanical properties of metal-ceramic systems from nickel-chromium and cobalt-chromium alloys
Mirkovi? Nemanja
Vojnosanitetski Pregled , 2007, DOI: 10.2298/vsp0704241m
Abstract: Background/Aim. Metal-ceramic bond strength and alloys' elastic modulus clearly determine the potential of alloy application, because the ceramic integrity during mastication depends on these two characteristics. The aim of this study was to evaluate metal-ceramic bond strength and elastic modulus of cobalt-chromium alloys in making porcelainfused- to-metal restorations, regarding the application of the most frequent nickel-chromium alloy. Methods. The research was performed as an experimental study. Six metalceramic samples were made from nickel-chromium alloy (Wiron 99) and cobalt-chromium alloy (Wirobond C), according to the manufactures manuals and instructions from ISO 9693: 1996. Three-point bending test was performed up to the ceramic fracture. The fracture load was measured on an universal testing machine (Zwick, type 1464), with cross-head speed of 0,05mm/min. Results. The results of this study confirmed the significant differences between the metal-ceramic bond strength (p < 0.01) and elastic modulus (p < 0.001) of nickel-chromium and cobalt-chromium alloys, where cobalt-chromium alloys showed higher values for both tested parameters. Conclusion. Cobalt-chromium metal-ceramic alloys can successfully replace nickel-chromium alloys, especially for fabrication of long-span metal-ceramic bridges due to the great flexural strength.
Nemanja Todorovi?
Zbornik Radova Ekonomskog Fakulteta u Isto?nom Sarajevu , 2011,
Abstract: Company crisis could be defined asa process in a period of time that unexpectedlythreatesn the realization of the mission and goals ofthe company. As such, it has been present forseveral years both in highly developed countries ofthe world and in our country. The causes of thecrisis can be numerous, and the current crisis inour business is in many ways specific, and requiresa large extent and greater involvement ofmanagement structures in the detection andelimination of consequences caused by the crisis. Inthis regard, the management structure must focusattention to high-quality accounting - informationsupport, which results from adequately establishedconcept of managing accounting. Appropriate,timely and relevant information on economicperformance are necessary for its success, which atthe same time assume the role of control and/ordispositive crisis management instruments in thecompany. The information derived from managingaccounting as a quality base for decision makingshould enable recognition of symptoms and causesof the crisis, as well as crisis prevention andassessment. The paper recalls the specific and mostcommon causes of the crisis in the company, as oneof the important issues, especially in the globaleconomic crisis. In addition, the paper will pointout the importance of setting realistic goals andpossibilities to prevent the crisis. Finally, wehighlight the importance of cost accounting inorder to overcome the effects of the crisis.
Nemanja Todorovi?
Zbornik Radova Ekonomskog Fakulteta u Isto?nom Sarajevu , 2012,
Abstract: The paper examines the concept ofinformation support to cost management, as well asthe principle of decision-making on the ground ofthe facts based on analysis of data and informationcontained in financial reports. The starting point isthat the facts are not known until the data andinformation are systematized and explained.Analyzing relevant data leads to the facts uponwhich decisions are made in order to reduce therisk of decision-making based solely on opinion(position) of the management.It also points out the importance and access tofinancial information, which is fundamental tomaking good and sustainable business andfinancial decisions, in terms of achieving targetedobjectives.Finally, the paper gives a comment of thebusiness as the relevant information document forthe company management.
Nemanja ?arenac
Zbornik Radova Ekonomskog Fakulteta u Isto?nom Sarajevu , 2012,
Abstract: This paper studies the knowledgeeconomy and competitiveness of countries and theirmutual influences. The development of informationand communication technologies and the growth ofthe global economy have created a competition thatboasts features of the knowledge economy. A keyresource and competitiveness base in the moderneconomy is knowledge, which is the foundation ofsocial progress. Knowledge economy requireschanges in the process of creating value andsources of competitive advantage. How knowledgeis used effectively for economic development andlevel of development of countries in this regard ismeasured by an index of the knowledge economy.This paper presents many of the world reports andparameters that reflect the position of Bosnia andHerzegovina and its competitors in the globaleconomy, which permeates every pore of society.
A Closed Bianchi I Universe in String Theory
Nemanja Kaloper
Physics , 1992, DOI: 10.1142/S021773239300043X
Abstract: A special Bianchi I universe is constructed in $~4D~$ string theory. Geometrically it represents a $~3D~$ anti-de-Sitter space crossed with a flat direction whereas in terms of an associated conformal field theory it is an extremal case of a gauged WZWN theory with target the coset $~SU(1,1) \times R^2 / R~$. Some of its properties are discussed.
Three Dimensional Black Holes and Four Dimensional Black Strings as Nonlinear Sigma Models
Nemanja Kaloper
Physics , 1993,
Abstract: Two solutions of stringy gravity in three and four dimensions which admit interpretation as a black hole and a black string, respectively, are discussed. It is demonstrated that they are exact WZWN nonlinear sigma models to all orders in the inverse string tension, and hence represent exact conformal field theories on the world-sheet. Furthermore, since the dilaton for these two solutions is constant, they also solve the equations of motion of standard GR with a minimally coupled three form field strength. (Based on a talk presented at the Conference on Quantum Aspects of Black Holes, U. of California, Santa Barbara CA June 21-27 '93, and a poster presented at 5th Canadian Conference on General Relativity and Relativistic Astrophysics, Waterloo, Ont., May 13-15, 1993.)
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