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31182. Unsteady boundary layer flow due to a stretching porous surface in a rotating fluid
- Creator:
- Govardhan, K., Balaswamy, B., and Kishan, N.
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- stretching porous surface, rotating fluid, viscous flow, and skin friction
- Language:
- English
- Description:
- The induced unsteady flow due to a stretching porous surface in a rotating fluid, where the unsteadiness is caused by the suddenly stretched surface is studied in this paper. After a similarity tranformation, the unsteady Navier-Stokes equations have been solved numerically using the Adams Predictor Corrector Method. It is found that there is a smooth transition from the small time solution to the large time or steady state solution. and Obsahuje seznam literatury a názvosloví
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
31183. Unsteady Hartmann flow with heat transfer of a viscoelastic fluid under exponential decaying pressure gradient
- Creator:
- Attia, Hazem Ali and Abdeen, Mostafa A. M.
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- MHD flow, heat transfer, non-Newtonian, viscoelastic, electrically conducting fluids, and suction and injection
- Language:
- English
- Description:
- The unsteady Hartmann flow of a conducting incompressible non-Newtonian viscoelastic fluid between two parallel horizontal insulating porous plates is studied with heat transfer. A uniform pressure gradient which decays exponentially is imposed in the axial direction. An external uniform magnetic field and uniform suction and injection through the surface of the plates are applied in the vertical direction. The two plates are kept at different but constant temperatures while the Joule and viscous dissipations are considered in the energy equation. Numerical solutions for the governing momentum and energy equations are obtained using finite differences. The effect of the magnetic field, the parameter describing the non-Newtonian behavior, and the velocity of suction and injection on both the velocity and temperature distributions is investigated. and Obsahuje seznam literatury
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
31184. Untersuchungen über die Klimatischen Verhältnisse von Beirut, Syrien
- Creator:
- Stanislav Kostlivý
- Publisher:
- Verlag der königl. böhmischen Gesellschaft der Wissenschaften
- Format:
- print, svazek, and 159 stran : ilustrace, grafy, tabulky.
- Type:
- model:monograph and TEXT
- Subject:
- Geologie. Meteorologie. Klimatologie, 19. století, klima, klimatické podmínky, meteorologická měření, climate, climatic conditions, meteorological measurements, Bejrút (Libanon), Sýrie, Beirut (Lebanon), Syria, 551.58, 551.583, 551.501, (569.3), (569.1), (049), (083.41), 7, and 551
- Language:
- German
- Description:
- von Stanislav Kostlivý., NTM, and Vorgelegt in der Sitzung der königl. Böhm. Gesellschaft der Wissenschaften in Prag am 14. Oktober 1904.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
31185. Untimely sleepiness: The problem and the current state of its management
- Creator:
- Dostálová , Simona and Šonka, Karel
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- Sleep quality, sleep quantity, circadian rhythm, sleepiness, sleepiness countermeasure, and vigilance
- Language:
- English
- Description:
- In modern society, many people keep working hours different from the standard (9 hours, 5 days a week during conventional time of the day), a regimen leading to sleep deprivation and/or circadian desynchronization, and, consequently, to sleepiness, fatigue, impaired efficiency and ultimately to psychic and somatic complaints. Fortunately, sleepiness-related health and occupational hazards can be kept under control using scientifically tested precautions designed to help maintain wakefulness. Suitable work and rest scheduling and observance of the principles of sleep hygiene are of major importance there. In situations which interfere with sleep, it is possible to use hypnotics or behavioral techniques and melatonin for circadian regimen optimization. In situations when sleep loss is temporarily inevitable, options to be taken into account include work shift shortening, breaks for rest, naps of short duration or administration of vigilance enhancing drugs. In the future, risks associated with sleepiness could be mitigated by means of currently developed technologies for real-time detection of sleepiness.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
31186. Unusual motion of Amor
- Creator:
- Ziołkowski, K.
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- space research, minor planet Amor, and motion of asteroids
- Language:
- Czech
- Description:
- Rrecise analysis of the orbit of minor planet (1221) Amor, based on all observations made In 1932-1980, shows that in 1956 there was an unexplained event in the motion of the asteroid. Possible interpretations of that fact as well as peculiarities in the long-term motion of Amor in 1650-2170 are discussed. The ephemeris of Amor for 1988 is presented.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
31187. Unusual precession
- Creator:
- Olexa, Zdeněk
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Language:
- English
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
31188. Unwanted Silesia: Czech ''Silesian Identity'' in postwar Czechoslovakia (1945-1969)
- Creator:
- Knapík, Jiří and Jirásek, Zdeněk
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- historiography, North Moravian region, Silesia, and Petr Bezruč
- Language:
- English
- Description:
- The Czech ''Silesian identity'', obvious throughout the twentieth century, was based on a mixture of strong regional, even local, patriotism, which was determined by historical developments. This patriotism developed on the ethnically mixed territory of Czech Silesia (formerly Austrian Silesia). After the Second World War, this phenomenon was quickly revived, but unlike in the pre-war period, it took a clearly Czech national form. The territorial factor, by contrast, receded into the background. Behind this activity and new interpretation stood intellectual circles and institutions in Opava, some leading fi gures from Ostrava, and the Silesian Cultural Institute in Prague. In addition to cultural-educational activity, their efforts were concentratedon claiming some border areas of Polish and German Silesia as being historically Czech, and also on ensuring the distinctive administrative status of the territory of Silesia in Czechoslovakia, the seed of which they saw in the Ostrava branch of the Moravian National Committee (Zemský národní výbor) in Brno. During the Communist regime, according to the authors, the top state authorities showed an intentional lack of interest in the problems of Silesia when solving related economic and other questions. A consequence of this was a ''silencing of the offi cial sources'' about Silesia. In the 1950s, the ''Silesian-ness'' was condemned as a form of ''bourgeois nationalism'' and was identifi ed with the period of Czech-Polish national friction in the region. From the administrative point of view, Silesia was dissolved in the Ostrava area, later in the North Moravian Region, and was recalled practically only by artistic expressions of an ''Old Silesian-ness'', such as folklore and museum exhibitions. Silesian organizations and societies were, with few exceptions, dissolved or renamed and the newly established Silesian Research Institute in Opava had to orient its historical research chiefl y to the labour movement. The works of the poet Petr Bezruč (born Vladimír Vašek, 1867-1958) and his collection of verses, Slezské písně (Silesian Songs), presented a problem because of their questionable depiction of Silesian identity, and the publication of the complete collection led to disputes in cultural policy. The Ostrava-based arts and politics periodical Červený květ (Red Flower), which repeatedly included debates about regionalism, began to be published in the mid-1950s. At the end of the decade, however, the Communist Party launched a campaign against parochialism (lokálpatriotismus), which was refl ected also in the condemnation of publications seeking to exonerate the poems and ideas of Óndra Łysohorsky (born Ervín Goj, 1905-1989), who during the war promoted the theory of a ''Lach nation.'' In the 1960s, the local authorities and fi gures of Opava again began to emphasize the role of their town as a regional centre. During the Prague Spring of 1968, there were calls for the restoration of Silesian self-government, but that remained more or less limited to the Opava region, and consequently some ''Silesian'' cultural initiatives from this period were of greater importance.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
31189. Up-regulation of cyclic electron flow and down-regulation of linear electron flow in antisense-rca mutant rice
- Creator:
- Jin, S.-H., Wang, D., Zhu, F.-Y., Li, X.-Q., Sun, J.-W., and Jiang, D. A.
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- chlorophyll fluorescence, CO2 assimilation rate, intercellular CO2 concentration, post-irradiation transient increase in chlorophyll fluorescence, and P700+ re-reduction
- Language:
- Multiple languages
- Description:
- To investigate how excess excitation energy is dissipated in a ribulose-1,5-bisphospate carboxylase/oxygenase activase antisense transgenic rice with net photosynthetic rate (PN) half of that of wild type parent, we measured the response curve of PN to intercellular CO2 concentration (Ci), electron transport rate (ETR), quantum yield of open photosystem 2 (PS2) reaction centres under irradiation (Fv'/Fm'), efficiency of total PS2 centres (ΦPS2), photochemical (qP) and non-photochemical quenching (NPQ), post-irradiation transient increase in chlorophyll (Chl) fluorescence (PITICF), and P700+ re-reduction. Carboxylation efficiency dependence on Ci, ETR at saturation irradiance, and Fv'/Fm', ΦPS2, and qP under the irradiation were significantly lower in the mutant. However, NPQ, energy-dependent quenching (qE), PITICF, and P700+ re-reduction were significantly higher in the mutant. Hence the mutant down-regulates linear ETR and stimulates cyclic electron flow around PS1, which may generate the ΔpH to support NPQ and qE for dissipation of excess excitation energy. and S.-H. Jin ... [et al.].
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
31190. Updating Bayesian networks using crowds
- Creator:
- Sarma, H., Samaddar, A.B., Porzel, R., Smeddinck, J.D., and Malaka, R.
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- CPT, Bayesian network, crowdsourcing, human computation, exercise instructions, collective intelligence, and automatic update
- Language:
- English
- Description:
- Physical exercise instruction sheets are difficult to understand. In general, considerable information is hidden in these types of instruction sheets, which also makes them difficult for machines to understand. Major missing information types include the source and destination location of a human movement. Here we present a Bayesian network to extract the implicit or missing information from typical exercise instruction sheets. We proposed two different kind of Bayesian networks which consists of three and four variables respectively. The network with three variable are designed to for single exercise instruction with single action or pose and the other one designed for single or multiple sentence with two actions or poses. The conditional probability table (CPT) is the backbone of the Bayesian network. At the start, the CPT is updated from our physical exercise instruction sheet corpus (PEISC). Keeping the Action and Bodypart fixed, we have developed our CPT using a unique approach, i.e., crowdsourcing, where we have developed a CPT update system using 13 different exercises consisting of 44 different exercise videos. Using this system based on the rating of a participant of the video the specific variable of that CPT is updated automatically in the Bayesian network. We also updated the Action variable, which consists of 14 different values (action verbs) using crowdsourcing with a human computation approach.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public