18,269 research outputs found
Muhammed b. İbrahim ve Yûsuf u Zuleyhâ’sı
No full textKonusunu kutsal kitaplardan alan Yûsuf u Züleyhâ hikâyesi Klasik TürkEdebiyatı, Modern Türk Edebiyatı ve Türk Halk Edebiyatında sıkça ele alınmışbir konudur. Arap, Fars ve Türk edebiyatında çoğunluğu manzum olarakkaleme alınmış pek çok örneği vardır. Manzum örneklerinin yanında, gerekmüstakil, gerekse tefsir ve Kısas-ı Enbiyalar içerisinde olmak üzere çok kıymetlimensur örnekleri de vardır.Eski Türk Edebiyatı’nda çoğunlukla manzum eserler ön planda olduğundanmanzum Yûsuf u Züleyhâ’lar daha çok tanınmış ve yayılmıştır. Haliyle yapılanilmî çalışmalar da bu yönde olmuştur. Bugüne kadar 50 adet manzum örneğitespit edilmiştir. Halbuki Eski Türk Edebiyatı’nda yazılmış mensur Yûsuf uZüleyhâ hikayeleri de bulunmaktadır. Bu eserler, bazıları üzerinde münferitilmî çalışmalar olsa da, toplu bir şekilde değerlendirilmemiştir.Yûsuf u Züleyhâ Arapça, Farsça ve Türkçe cümlelerle örülü ve şiirsellikle dolubir eserdir. Muhammed b. İbrahim âhengi, akıcılığı ve hareketi sağlamakamacıyla seci’lerden faydalanmakla yetinmemiş, edebî sanatların birçoğunukullanarak özgün bir üslûp oluşturmuştur. Türkçeyi yermesine rağmeneserinde Türkçe, Arapça ve Farsça dillerinin imkanlarını kullanmaktan geridurmamıştır. Arapça ve Farsça sözcükleri kullanmada gösterdiği maharetiTürkçede de göstermiştir. Eserde seciler ve simetrik cümleler çoğunluktadır.Cümleler anlaşılır, üslubu akıcı ve coşkundur
A Dynamic Subfilter-scale Stress Model for Large Eddy Simulations Based on Physical Flow Scales
No full textWe propose a new definition of the length scale in an eddy-viscosity model for large-eddy simulations (LES). This formulation extends and generalizes a previous proposal [Piomelli, Rouhi and Geurts, Proc. ETMM10, 2014], in which the LES length scale was expressed in terms of the integral length-scale of turbulence determined by the flow characteristics and explicitly decoupled from the simulation grid; this approach was named Integral Length-Scale Approximation (ILSA). As in the original ILSA, the model coefficient was determined by the user, and required to maintain a desired contribution of the unresolved, subfilter scales (SFS) to the global transport. We propose a local formulation (local ILSA) in which the model coefficient is local in space, allowing a precise control over SFS activity as a function of location. This new formulation preserves the properties of the global model; application to channel flow and backward-facing step verifies its features and accuracy
Fully Turbulent Mean Velocity Profile for Purely Viscous non-Newtonian Fluids
No full textThe characteristic near wall behavior of turbulent flow of purely-viscous non-Newtonian fluids is discussed for both power-law (P.-L.) and Herschel-Bulkley (H.-B.) rheological models. A proper scaling is presented for H.-B. fluids to establish an analogy with power-law fluids with same flow index. To provide reference data for turbulent flow of non-Newtonian fluids, DNS simulations of power-law fluids are conducted in a rectangular channel for a large range of power-law indices ( = 0.5, 0.69, 0.75, 0.9, 1, 1.2). The DNS data show that the mean velocity profile in the viscous and logarithmic layers follow expressions of the form and respectively, where shows a logarithmic dependency on the flow index.Comparison with some experimental data shows the above formulation to be valid for Reynolds numbers (based on shear velocity) as high as 1000
Branching fraction and CP asymmetry of the decays B+→K0Sπ+ and B+→K0SK+
No full textAn analysis of B+ → K0
Sπ+ and B+ → K0
S K+ decays is performed with the LHCb experiment. The pp
collision data used correspond to integrated luminosities of 1 fb−1 and 2 fb−1 collected at centre-ofmass
energies of
√
s = 7 TeV and
√
s = 8 TeV, respectively. The ratio of branching fractions and the
direct CP asymmetries are measured to be B(B+ → K0
S K+
)/B(B+ → K0
Sπ+
) = 0.064 ± 0.009 (stat.) ±
0.004 (syst.), ACP(B+ → K0
Sπ+
) = −0.022 ± 0.025 (stat.) ± 0.010 (syst.) and ACP(B+ → K0
S K+
) =
−0.21 ± 0.14 (stat.) ± 0.01 (syst.). The data sample taken at
√
s = 7 TeV is used to search for
B+
c
→ K0
S K+ decays and results in the upper limit ( fc · B(B+
c
→ K0
S K+
))/( fu · B(B+ → K0
Sπ+
)) <
5.8 × 10−2 at 90% confidence level, where fc and fu denote the hadronisation fractions of a ¯b
quark
into a B+
c or a B+ meson, respectively
Reynolds number effect on turbulent drag reduction
No full textAn analytic relationship that predicts the Reynolds number effect on turbulent drag reduction by active means is developed in analogy with riblets. It is applicable to all control techniques whose action result in an upward shift ∆B of the logarithmic region of the turbulent velocity profile. In particular, we use it to address the Re-effect affecting streamwise-traveling waves of spanwise wall velocity \cite{quadrio-ricco-viotti-2009}, aided by a new large dataset of Direct Numerical Simulations of turbulent channel flows at increasing Re. The main outcome of this study is that the control-induced upward-shift of the logarithmic region ∆B does not vary with Re along a large part of the wave parameter space, also where high drag reduction is achieved. Here, the analytical relationship allows to extrapolate low-Re drag reduction information to high-Re flows. In the narrow regions where ∆B does vary with Re, an additional Re-effect is deemed to exist, which depends on the present control technique only and which is investigated with a three-dimensional phase conditional averaging procedure
Spectral properties of Andreev reflection from quantum turbulence in 3He-B: What do they tell about turbulent fluctuations?
No full textOne of the experimental techniques developed to measure quantum turbulence at low temperatures in 3He-B utilizes the Andreev reflection of thermal quasiparticle excitations from quantized vortices and vortex structures. We present the results of theoretical, numerical, and experimental study of Andreev scattering from quantum turbulence in 3He-B. We analyze the spectral properties of the Andreev reflection and compare these with the spectral properties of superfluid turbulence, and discuss the physical mechanisms responsible for the scaling of spectral densities. Finally, we discuss the relation between our findings and related observables in ordinary turbulence
Stability and exact coherent structures of the asymptotic suction boundary layer with temperature gradient
No full textThe asymptotic suction boundary layer with a temperature gradient is a good point of entry to study the dynamics of thermal boundary layers by means of dynamical systems theory. The laminar flow without heating is parallel and its properties have been studied before. We add a temperature difference between the bottom plate and the free stream flow, and study the stability in dependence on Reynolds, Rayleigh and Prandtl number. In marked contrast to the usual Rayleigh-B\'enard problem, the onset of convection is subcritical. Tracking secondary bifurcations we identify time-periodic, spanwise, and doubly-localized exact coherent states for this flow
The water resources structures on the Syrian and Egyptian pilgrim routes to Makka and Medinah
No full textAI-Hajj in Arabic means the pilgrimage to MAKKA. This was
an ancient rite which was recognised a long time before the
rise of Islam. According to the holy Quran and Islamic
tradi tion, AI-Haj j goes back to the time of the prophet
Ibrahim. Thus MAKKA was a focus for worship but it was also
a commercial centre and a way station/stopping place on the
ancient trade caravan road between south western -Arabia and
Bilad AI-Sham,' now Syria. In part the inhabitants of MAKKA
practised this trade because their environment was not
suitable for other alternative economic activities.
The importance of MAKKA, as a ritual place increased after
the rise of Islam because it became Qibla-Kiblah -
the direction to which muslims turn in praying towards AIKa'aba.
Yathrib - later to become Medinah - is the second holy city.
In fact it was not a ritual place, but like MAKKA it was a
stopping place on the ancient trade caravan road. The
inhabitants of Medinah practised agriculture because their
environment was more suitable than that at MAKKA; water was
available and the land was fertile so that in addition to
trade, they also practised agriculture.
The importance of Medinah as a holy place only developed
after AI-Hijra - the immigration of the prophet Mohammad,
peace be upon him, to it and his establishing of Islam at
that site. Medinah became the capital of the Islamic state
both religiously and politically. Islam then spread from
Medinah over the Arabian Peninsular to the world beyond.
The consequence of the conquest of Iraq, Bilad AI-Sham,
Egypt, the north coast of Africa and Persia was that the
majority of the population of these countries accepted and
adopted Islam as their religious faith. As a result of this
the populations of these countries came annually to make AlHajj and in doing so developed several additional pilgrim
caravan routes. However, it is the Syrian and Egyptian
pilgrim routes - Tareeq AI-Hajj AI-Shami and Wal Masri which
are the objects of this work. In both these cases the
pilgrim caravan routes were previously ancient trade caravan
routes which travelled through Arabia, particularly through
the western province of Al Hijaz.
The geographical location of Arabia, the cross roads of
three continents, Asia, Africa, and Europe, made important
the pre-Islamic routes which ran through it. Of course the
function of this network at that time was commercial but
after the rise of Islam the function of this network of
routes became to transport the pilgrims. The geological and
topographical features, as well as climatic conditions, in
Arabia played a great role in determining the ancient routes
in Arabia. The availability of water was a very important
consideration on these routes and was influenced by
environmental conditions. Since the rainfall is
insufficient, the resulting absence or shortage of water on
the pilgrim caravan routes made the caliphs pay great
concern to providing the pilgrim routes with the most
essential facilities, particularly water supplies and
storage. Ever since the earliest Islamic times, they
provided for the travellers Al birak, water tanks; Ahwadh cisterns; Qanawat - channels; and abyar - wells, in order to
make AI-Hajj journey more comfortable. The pilgrim caravans
in general, and the Syrian and Egyptian pilgrim caravan
routes in particular, passed through several stages of
development since their origin in early Islamic times and
these evolutionary stages can be seen until the beginning of
this century. Because the object of this thesis is to
document the remains of the water resource structures, an
extensive survey and investigation has been completed on the
Syrian and Egyptian pilgrim caravan routes. The field work
has been conducted in Saudi Arabia, particularly in the
north western region where the Syrian and Egyptian pilgrim
routes cross the country. The field work mainly aimed at
ascertaining the location of all the way stations and their
names and surveying each station in order to record the
surviving remains of water resource structures. The field
work covered a large area of about 8, OOOkm transect and
extended from MACCA in the south through Medinah to the
North as far as Halat I Ammar on the north at the border
between Saudi Arabia and Jordan. From N.W. to S .Wit
stretched from Haql on the Gulf of AI-' Aqaba as far as
MAKKA. These routes consist of the major, or principal
caravan routes as well as a number of traverse routes which
allow travellers a choice of transit as well as connecting
routes. There are large way stations as well as small minor
way stations. As part of this dissertation, almost all the
stopping places have been identified and documented by mapping and photography
Large-Scale Circulation Reversals in a 2D Rayleigh-Bénard cell
No full textWe consider the numerical simulation of a two-dimensional Rayleigh-B\'enard cell in the turbulent regime and . The flow is dominated by a large-scale inclined roll, the orientation of which switches intermittently in time. We use Proper Orthogonal Decomposition to identify the most energetic modes. We find that the first two modes respectively correspond to an antisymmetric and a symmetric mode. The next most energetic mode breaks the symmetry of the flow. During reversals, sharp variations in the temporal amplitudes of the modes are observed. We derive a low-dimensional model based on the first three most energetic modes which is able to reproduce the large-scale circulation reversals, in quantitative agreement with the simulation
A conceptual framework for supporting gender inclusivity in games
No full textGender inclusivity in games is still exploratory and, despite an increase in games and gender research, many challenges remain in designing a more gender-inclusive game. This thesis addresses the problem of how to support gender inclusivity in games by combining theories in games and gender. Existing research in games and gender tend to focus on finding out how each gender plays and their preferences in games. However, there is little evidence that researchers have approached the issue of gender inclusivity in games with the intent of building a cohesive understanding of gender inclusivity in games and the relationships that exist between the different dimensions and components. Consequently, this research has developed a conceptual framework that supports gender inclusivity in games.A central contribution of this research is the development of a Gender Inclusivity Framework (GIF) to support an integrative approach to understanding and evaluating gender inclusivity in games. The framework enables understanding of the makeup of gender inclusivity in games and measures the level of gender inclusivity in games. Drawing upon established theories and prior research findings, the framework indicates that gender inclusivity in games can be determined by three dimensions: (1) gameplay, which relates to game behaviours; (2) content, which relates to aesthetics elements of a game; and (3) genre, which relates to types of games. Each dimension in the framework is divided into individual components that can be modified or further investigated in future studies. Each component in combination describes the dimension in terms that can be measured and evaluated in empirical studies. Hence, the combination of dimensions and components used to construct the framework provide the description of gender inclusivity in games, which in turn predicts the degree of gender inclusivity in games.An example of GIF application has been demonstrated through the development of a novel measuring instrument called Gender Inclusivity Rating Scale (GIRS) and through a series of experiments, the GIRS has been validated and used in a research scenario to investigate the differences in gender inclusivity in game component between a gamer's gender role orientations.This thesis presents a detailed discussion of the GIF development, validation and application. For researchers, the GIF provides a common framework in which to conceptualise their research and make it easier to see how individual variables fit into the larger picture. For game designers, the GIF enables deconstruction of the concept of gender inclusivity in games into smaller, conceptually distinct and manageable components to guide the design of gender inclusivity in games
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