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Cooling of Granules in Vibrating, Suspended Bed: Engineering Simulation  [PDF]
Valery Katz, Slava Katz
Modern Mechanical Engineering (MME) , 2016, DOI: 10.4236/mme.2016.62009
Abstract: Here we suggest an algorithm for calculation of the process parameters and design of a vertical cooler with inclined, gas-permeable blades and with a vibrating, suspended layer of granules on them (Vibrating Fluidized Bed—VFB). The algorithm is based on the use of the equations of heat and material balance, taking into account the influx of moisture into the layer with cold air and dust—as a carryover. Mode entrainment of dust particles and moisture from the VFB is described by using empirical formulas and Π-theorem. To calculate the cooling time of granules a model of the dynamics of a variable mass VFB was built, which linked the geometrical and physical process parameters to a single dependency. An example showed that mass flow of granules of 248 kg/h and a volume flow of air of 646 m3/h with temperature of 30 to cool the zeolite granules from 110 to 42 for 49 s required a vertical apparatus of rectangular shape with four chambers and with volume of 0.2 m3. A comparative analysis of technological parameters of the projected cooler with the parameters of typical industrial apparatuses showed that for all indicators: the cooling time of granules, the flow rate of gas (air) and the heat flow, a 4-chambered, vertical apparatus of rectangular shape with VFB was the most effective.
Trees and Nests: A Comparison between Two Hierarchical Metaphors in Educational Applications  [PDF]
Adi Katz
Creative Education (CE) , 2012, DOI: 10.4236/ce.2012.31021
Abstract: The aim is to determine whether one of two hierarchical metaphors, the tree (parent-child) or the nested (object-container), is more suitable for designing educational interfaces for children. To cope with this issue an experimental educational application was designed with a prototype for each hierarchical metaphor. The application was evaluated in a laboratory experiment, where children participants interacted with the prototypes to find answers for questions that require searching for information. Task performance was measured in terms of effectiveness, efficiency and subjective aspects such as user perception of ease of use and user preference. The nested (object-container) metaphor was found to be preferred by users and superior in several objective parameters of performance efficiency, but no significant differences were found in the perceived ease of use and in the performance effectiveness. Implications for designing educational applications are discussed.
The Role of the Press in the Unilateral Disengagement Plan of Israel from Gaza Strip  [PDF]
Yaron Katz
Open Journal of Political Science (OJPS) , 2013, DOI: 10.4236/ojps.2013.31002
Abstract:

The Disengagement Plan is the name assigned to the plan enacted in the summer of 2005 to evict all Israelis and military bases from Gaza Strip and four isolated settlements in northern Samaria and to withdraw unilaterally. The plan was controversial, yet it won the support of the majority of the cabinet and the Knesset members, as well as the support in Israel and the world. The eviction process of the residents was accompanied by vast activities of the army and police forces in fear of violent acts by the evacuees, and by extensive media coverage. It was one of the longest and most covered events in the history of Israel and intensified the conflict between security needs and free press. In democracies such as Israel, which faces security needs on permanent basis, the media are expected to carry social responsibility duties of not publishing information that is sensitive to national security. It is commonly agreed that although Israel is a democratic state where freedom of speech and freedom of the press are cornerstones of its existence, in all that relates to security things should be different, and security issues are above the need of the media to publish and the need of the public to know. The position of the press in the disengagement and the way they dealt with this dilemma are analyzed in this study based on covering reports in the main Israeli daily newspaper—Yediot Achronot—during the period from January 1, 2005 through August 24, 2005, when the evacuation of all Israelis from Gaza Strip was completed.

Stratified Convexity & Concavity of Gradient Flows on Manifolds with Boundary  [PDF]
Gabriel Katz
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.517270
Abstract: As has been observed by Morse [1], any generic vector field v on a compact smooth manifold X with boundary gives rise to a stratification of the boundary \"\" by compact submanifolds \"\" , where \"\". Our main observation is that this stratification re-flects the stratified convexity/concavity of the boundary \"\" with respect to the  v-flow. We study the behavior of this stratification under deformations of the vector field v. We also investigate the restrictions that the existence of a convex/concave traversing  v-flow imposes on the topology of X. Let \"\"be the orthogonal projection of \"\"on the tangent bundle of \"\". We link the dynamics of the\"\"on the boundary with the property of \"\"in X being convex/concave. This linkage is an instance of more general phenomenon that we call “holography of traversing fields”—a subject of a different paper to follow.
Technology and Innovation in Israel: Advancing Competitive Position in a Global Environment  [PDF]
Yaron Katz
Open Journal of Political Science (OJPS) , 2018, DOI: 10.4236/ojps.2018.84033
Abstract: The question that stands at the heart of this research is, based on the Israeli experience: how technology is changing society? Such question is extremely important, as countries seek to advance in their competitive position in a global environment. The assumption made here is that competition between countries has accelerated with the development of technology, as the distinc-tion between developed and developing countries became apparent. That brings up the question: what is needed to build comparative advantages and be successful in a global world? Israel is a remarkable example of global competition, as high-tech development has been based on the performance of the country in the field of innovation. However, as the research demon-strates, the contradiction in Israel’s status is evident in the supremacy of the country in technological advancement and the weaknesses in so-cial-economic development. This proves the dilemma countries face in ad-vancing technology: while it is obvious that both technology and globaliza-tion have a great and positive impact around the world, they have been nega-tive for the socio-economic gaps and inequality. This is where the role of developing countries is apparent in establishing a successful high-tech in-dustry and a growing global economy, despite social disadvantages.
Israel’s Social Media Elections  [PDF]
Yaron Katz
Open Journal of Political Science (OJPS) , 2018, DOI: 10.4236/ojps.2018.84032
Abstract: Social media has become a major tool to disseminate information, opinions and news, used for political campaigning and offering new opportunities for individuals and politicians alike. The Prime Minister of Israel, Binyamin Netanyahu, has been particularly aggressive in his use of social media to gather political support. Considered as the great survivor of Israeli politics, that flourished in the atmosphere of social protests and emerged from the old political mechanism, he derives his power from social networks, using them as alternative media to the traditional networks. As the research demon-strates, social media has determined dramatic changes in the balance of po-litical power, and although the main channels of information remain the tra-ditional media, the exposure of the public to social media is accelerating with a wide unmediated public debate. With social media, newcomers in Israeli politics could also create a presence and rise to become renowned politi-cians. It is interesting however, that the veteran politician—Netanyahu—was able to take advantage of disseminate information over the Internet and be-come active on his Facebook page, including engaging Internet users in direct dialogue. The paper examines the use of social media by newcomers and veteran politicians in the last two elections and analyzes the way Netanyahu used social media to accomplish his political goals, including high involve-ment of the public and motivating record-high voter turnout to maintain his own reelection and the domination of the Israeli Parliament by the Likud Party.
Technology, Society and the Digital Gap  [PDF]
Yaron Katz
Advances in Applied Sociology (AASoci) , 2019, DOI: 10.4236/aasoci.2019.91005
Abstract: What is more influential—technology or society? While this issue has been in constant dilemma for many researches, the situation in Israel is clear: Israel is a leading high-tech country and technology is leading society in all aspects. In terms of technology, Israel is a technologically advanced market economy. It is known as a “Start-up Nation”, which means that its economic growth is stupendous and leading in high-tech worldwide. On the other hand, Israel is among the most impoverished of the OECD member countries, with a high rate of poverty and a social and digital big gap between its rich and poor. The main issue that this research investigates is the social gap of a developed country and a leading start-up nation which falls behind many countries in major social and policy categories. As the research demonstrates, Israel is a prime example of the domination of technology over society. The country’s development is a product of the digital revolution which situates Israel as a developed country in terms of technology, however also has been negative for the socio-economic inequality, to what this research defines as the digital gap.
Tectonic-Geophysical Mapping of Israel and the Eastern Mediterranean: Implications for Hydrocarbon Prospecting  [PDF]
Lev Eppelbaum, Youri Katz
Positioning (POS) , 2011, DOI: 10.4236/pos.2011.21004
Abstract: The eastern Mediterranean is a tectonically complex region evolving in the long term located in the midst of the progressive Afro-Eurasian collision. Despite years of investigation, its geological-geophysical structure is not completely known. At the same time, the recent discovery of large gas deposits has attracted the attention of many researchers to this region. For instance, the latest U. S. Geological Survey estimates using conventional assessment methodology suggest that there are on the order of 1.7 billion barrels of recoverable oil and more than 4 trillion m3 of recoverable gas in the Levant Basin [1]. This highlights the need for analysis of the paleogeographical conditions that can yield deep paleotectonic criteria for oil and gas discovery in this region. For this purpose, isopach maps of the Middle-Upper Jurassic and Lower Cretaceous were generated from detailed examinations of numerous well sections and the most significant outcroppings in the eastern Mediterranean. The maps confirm an earlier model of continental accretion [2]. In particular, abrupt changes in the trend and thickness of the Early Mesozoic formations coincide with the terrane boundaries. These compiled isopach maps also pinpoint significant distinctions between the Arabian and Sinai plates on the one hand and the Syrian arc on the other. A new tectonic map of the eastern Mediterranean is presented that first of all integrates geophysical satellite-derived gravity and airborne magnetic fields, as well as tectonic-structural, paleogeographical and facial analyses. The results have clear implications for hydrocarbon prospecting in this region.
Epididymo-Orchitis in Pre-Pubertal Children. Epidemiology, Etiology, Management and Follow-Up Recommendations  [PDF]
Sarel Halachmi, Neri Katz
Open Journal of Urology (OJU) , 2013, DOI: 10.4236/oju.2013.32019
Abstract:

Epididymo-Orchitis (EO) is a disease that may affect males in all ages. Neonates and elderly patients may suffer from bacterial infection due to congenital or aging processes affecting the urinary tract. In sexually active post pubertal and young males sexually transmitted organisms may cause EO. EO is also prevalent in pre pubertal healthy boys; however in this group the etiology, the needed imaging modalities and proper management are not clearly defined yet. This manuscript will systematically review the various etiologies causing EO in pre-pubertal boys, discus about the needed proper imaging, and image interpretation, will give treatment and follow-up recommendations.

Mass Transfer in a Centrifugal Turbine Agitator-Pump  [PDF]
Valery Katz, Gedalya Mazor
Journal of Water Resource and Protection (JWARP) , 2014, DOI: 10.4236/jwarp.2014.65046
Abstract:

This article is a continuation of the research, centering on a vacuum-filtration system, which is designed to reduce the concentration of calcium in water; a process is also known as—water softening. The problem of solving the concentration distribution of the initial (embryonic) particles of CaCO3-particles, which were introduced into the limited volume of the apparatus with a turbine agitator-pump, is addressed through the use of diffusion and deterministic-stochastic models of mass transfer. The solution of the extreme problem allows determining the most important process parameters, such as time of dispersions homogenization and the dispersion mass flow rate to the surface of a special filter. For these parameters a comparative analysis of the adequacy of the theory was found through experiments, performed in the study. We found that uniform distribution of concentrations along the height of the apparatus is achieved by the angular velocity of the rotation 400 rpm for the turbine with 6 - 7 blades at the time of homogenization 14s. In this case, the dispersion mass flow to the surface of the cylindrical filter is 3 50 mg/s at an average concentration of the introduced CaCO3 particles, which is equal to 10 g/L. We determined that the accuracy of the results depends on: the coordinates of the material input in the apparatus volume, the surface shape of the filter and the volumetric flow rate of the liquid (water), being discarded by the turbine blades in the normal direction to their surface.

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