An Intelligent Tutoring System for Teaching the 7 Characteristics for Living Things

Recently, due to the rapid progress of computer technology, researchers develop an effective computer program to enhance the achievement of the student in learning process, which is Intelligent Tutoring System (ITS). Science is important because it influences most aspects of everyday life, including food, energy, medicine, leisure activities and more. So learning science subject at school is very useful, but the students face some problem in learning it. So we designed an ITS system to help them understand this subject easily and smoothly by analyzing it and explaining it in a systematic way. In this paper, we describe the design of an Intelligent Tutoring System for teaching science for grade seven to help students know the 7 characteristics for living things smoothly. The system provides all topics of living things and generates some questions for each topic and the students should answer these questions correctly to move to the next level. In the result of an evaluation of the ITS, students like the system and they said that it is very useful for them and for their studies

Analysis of the cross flow in a radial inflow turbine scroll

Equations of motion were derived, and a computational procedure is presented, for determining the nonviscous flow characteristics in the cross-sectional planes of a curved channel due to continuous mass discharge or mass addition. An analysis was applied to the radial inflow turbine scroll to study the effects of scroll geometry and the through flow velocity profile on the flow behavior. The computed flow velocity component in the scroll cross-sectional plane, together with the through flow velocity profile which can be determined in a separate analysis, provide a complete description of the three dimensional flow in the scroll

Computer program for the analysis of the cross flow in a radial inflow turbine scroll

A computer program was used to solve the governing of the potential flow in the cross sectional planes of a radial inflow turbine scroll. A list of the main program, the subroutines, and typical output example are included

Nonlinearity in Single Photon Detection: Modeling and Quantum Tomography

Single Photon Detectors are integral to quantum optics and quantum information. Superconducting Nanowire based detectors exhibit new levels of performance, but have no accepted quantum optical model that is valid for multiple input photons. By performing Detector Tomography, we improve the recently proposed model [M.K. Akhlaghi and A.H. Majedi, IEEE Trans. Appl. Supercond. 19, 361 (2009)] and also investigate the manner in which these detectors respond nonlinearly to light, a valuable feature for some applications. We develop a device independent model for Single Photon Detectors that incorporates this nonlinearity

W physics at the ILC with polarized beams as a probe of the Littlest Higgs Model

We study the possibility of using W pair production and leptonic decay of one of the W's at the ILC with polarized beams as a probe of the Littlest Higgs Model. We consider cross-sections, polarization fractions of the W's, leptonic decay energy and angular distributions, and left-right polarization asymmetry as probes of the model. With parameter values allowed by present experimental constraints detectable effects on these observables at typical ILC energies of 500 GeV and 800 GeV will be present. Beam polarization is further found to enhance the sensitivity.Comment: 17 pages, plain latex, 6 figures, replaced with version accepted by JHEP, typographical errors removed, notation and references improved, new references added, explanation added in appendix regarding beam polarization dependenc

Beyond the Practical Dilemmas and Conceptual Reductions: the Emergence of an "Accommodative Consciousness" in the Alternative Globalization Movement

This article attempts to show the emergence of a new ideological trend within the global field of resistance against the corporate-led globalization. This ideological trend, coined here the alter-globalization trend, is ideal-typically constructed in terms of its associated mode of social thought. The newly developed perspectives and cognitive transformations inside the global field of resistance convey a new mode of in-praxis thought, named here accommodative cognition. This heralds the formation of alternative principles for creating emancipatory knowledges and flexible solidarities. The paper draws on certain discursive evidence from the alter-globalization trend to show that the complexity of globalizing society and contemporary collective action is realized through the open spaces of dialogue and dispute introduced by the movement. This has resulted in the emergence of intellectual demands for transcending contradictions that are rooted in the post-1970s disputes between modernist and post-modernist, and materialist and post-materialist thoughts. Two other features of this new mode of cognition are: (1) a growing inclination to cut across incompatible conceptions of social polarities (i.e. around issues like class, gender, race, cultural identity, ethnicity, nationality and sexual orientation) in establishing a flexible solidarity based on accommodating the Other's interest and identity into the process of affirming the Self; and (2) understanding the complexities of globalization in terms of its structural unevenness, contradictions and multidimensionality

Star tracks in the ghost condensate

We consider the infrared modification of gravity by ghost condensate. Naively, in this scenario one expects sizeable modification of gravity at distances of order 1000 km, provided that the characteristic time scale of the theory is of the order of the Hubble time. However, we argue that this is not the case. The main physical reason for the conspiracy is a simple fact that the Earth (and any other object in the Universe) has velocity of at least of order 10^{-3}c with respect to the rest frame of ghost condensate. Combined with strong retardation effects present in the ghost sector, this fact implies that no observable modification of the gravitational field of nearby objects occurs. Instead, the physical manifestation of ghost condensate is the presence of ``star tracks'' -- narrow regions of space with growing gravitational and ghost fields inside -- along the trajectory of any massive object. We briefly discuss the possibilities to observe these tracks.Comment: 20 pages, 2 figures, final version published in JCA

Transversality in Diversity: Experiencing Networks of Confusion and Convergence in the World Social Forum

Drawing on the World Social Forum as an exemplary case study, this article shows how an emerging mode of cosmopolitanist vision (‘transversalism’) can be explained in terms of activists’ experiences of both complexity and contradiction in their networks. The paper questions the idea that the transnationalization of networks of solidarity and interconnection can uncomplicatedly encourage the growth of cosmopolitanism among global justice activists. Activists’ experiences of dissonances between their ideals, the complexity of power relations and the structural uncertainties in their global justice networks can provide them with a base for self-reflexive ideation and deliberation, and thereby encourage agendas for accommodating differences. Underpinning the accommodating measures which arise for dealing with such a cognitive-practical dissonance is a new mode of cosmopolitanism, coined here as ‘transversalism’. The article proposes a new conceptual framework and an analytical model to investigate the complexity of this process more inclusively and systematically

Signals of Supersymmetric Lepton Flavor Violation at the LHC

In a generic supersymmetric extension of the Standard Model, there will be lepton flavor violation at a neutral gaugino vertex due to misalignment between the lepton Yukawa couplings and the slepton soft masses. Sleptons produced at the LHC through the cascade decays of squarks and gluinos can give a sizable number of events with 4 leptons. This channel could give a clean signature of supersymmetric lepton flavor violation under conditions which are identified.Comment: 21 page

Causality, Analyticity and an IR Obstruction to UV Completion

We argue that certain apparently consistent low-energy effective field theories described by local, Lorentz-invariant Lagrangians, secretly exhibit macroscopic non-locality and cannot be embedded in any UV theory whose S-matrix satisfies canonical analyticity constraints. The obstruction involves the signs of a set of leading irrelevant operators, which must be strictly positive to ensure UV analyticity. An IR manifestation of this restriction is that the "wrong" signs lead to superluminal fluctuations around non-trivial backgrounds, making it impossible to define local, causal evolution, and implying a surprising IR breakdown of the effective theory. Such effective theories can not arise in quantum field theories or weakly coupled string theories, whose S-matrices satisfy the usual analyticity properties. This conclusion applies to the DGP brane-world model modifying gravity in the IR, giving a simple explanation for the difficulty of embedding this model into controlled stringy backgrounds, and to models of electroweak symmetry breaking that predict negative anomalous quartic couplings for the W and Z. Conversely, any experimental support for the DGP model, or measured negative signs for anomalous quartic gauge boson couplings at future accelerators, would constitute direct evidence for the existence of superluminality and macroscopic non-locality unlike anything previously seen in physics, and almost incidentally falsify both local quantum field theory and perturbative string theory.Comment: 34 pages, 10 figures; v2: analyticity arguments improved, discussion on non-commutative theories and minor clarifications adde