253 research outputs found
Book Extract: "Laughter in the Dark: Egypt to the Tune of Change" by Yasmine El Rashidi
No full textPRAISE FOR Laughter in the Dark
“Laughter in the Dark is a brilliantly composed portrait of Egypt’s answer to hip-hop—and how it functions as a musical genre, economic engine, and cultural force amid the restrictions of an increasingly authoritarian regime. Meticulously reported and elegantly written, it’s a must-read for any global citizen.” –ZACK O’MALLEY GREENBURG, author of Empire State of Mind: How Jay-Z Went From Street Corner to Corner Office
“In Laughter in the Dark, Yasmine El Rashidi provides a brisk, brilliant, and brave portrait of young Egyptians simmering under the weight of President Abdel Fattah El-Sisi’s repressive dictatorship and reveals the stark inequality between the rulers and the ruled.” –BASHARAT PEER, author of A Question of Order: India, Turkey, and the Return of Strongme
Politics in an Arabian Oasis: the Rashidi tribal dynasty
No full textThis text is both a study of the relationships between tribes and state formation, and a political history of central Arabia. It deals with the Rashidi dynasty which in the 19th century emerged among the Shammar camel herders, made the oasis of Hail a capital rivalling Mecca and Medina in fame and prosperity, and attempted to unify central Arabia into a single polity. The author considers why at this particular moment the Shammar became susceptible to political centralization, the internal and external factors that contributed to the emergence of their dynasty, the changes in the political system and the factors which contributed to the subsequent instability and decline of the Shammar polity in the 20th century
Fame bias in editorial choice: Yes or No?
No full textRecently, Scientometrics has published a paper titled “Is there bias in editorial choice? Yes” (Moustafa 2015) in which some comments are given on our published paper in Nature titled “Is there fame bias in editorial choice?” (Mahian et al. 2015). Unfortunately, the author of above mentioned paper and many other readers might misunderstand the main aim of our correspondence. Here, we try to give some explanations to clarify the main goal of analysis presented in the paper
Is there fame bias in editorial choice?
No full textNature’s Correspondence items are reviewed only by the editors (see go.nature.com/cmchno). To investigate whether editorial bias towards internationally renowned correspondents might be at play in selecting candidates for publication, we analysed the scientific status
of Correspondence authors published in 2014.
We used the following pointers to gauge author reputation: faculty member in one of the world’s top 100 universities
(as listed in the Times Higher Education World University Rankings; see go.nature. com/bhgfxd); authorship of Nature or Science publications; high h index. We classed correspondents as established scholars if they fulfilled any or all of these criteria.
The number of letters published in Correspondence
in 2014 was 239, each with
one ‘corresponding author’ responsible for submission and communication with the editors. We found that 54% of these authors met some or all of our criteria. Some 13% of authors came from the developing world.
Within the limitations of our ‘fame factors’ (for example, some correspondents were well known but from outside academia)
and of sampling only the corresponding authors, we infer that scientific celebrity does not notably influence the selection of Correspondence for publication
Analytical Modeling of MHD Flow over a Permeable Rotating Disk in the Presence of Soret and Dufour Effects: Entropy Analysis
No full textThe main concern of the present article is to study steady magnetohydrodynamics (MHD) flow, heat transfer and entropy generation past a permeable rotating disk using a semi numerical/analytical method named Homotopy Analysis Method (HAM). The results of the present study are compared with numerical quadrature solutions employing a shooting technique with excellent correlation in special cases. The entropy generation equation is derived as a function of velocity, temperature and concentration gradients. Effects of flow physical parameters including magnetic interaction parameter, suction parameter, Prandtl number, Schmidt number, Soret and Dufour number on the fluid velocity, temperature and concentration distributions as well as entropy generation number are analysed and discussed in detail. Results show that increasing the Soret number or decreasing the Dufour number tends to decrease the temperature distribution while the concentration distribution is enhanced. The averaged entropy generation number increases with increasing magnetic interaction parameter, suction parameter, Prandtl number, and Schmidt number
Assessment of spinal cord abnormalities and its related factors in male students of Islamic Azad University at Semnan
No full textBackground and aimDecreased mobility and physical activity are threatening factors of health and spinal cord as the basic axis of the body is of critical importance in this regard because any injury of deformity of it can cause body malfunction. The aim of this study was to assess abnormalities of spinal cord and some of their related factors in male students of Islamic Azad University at Semnan. Materials and methods In this descriptive study, 240 students in their Physical Education Course 1 took part in the study. New York Test Posture Screen validated and made reliable by content and test-retest (r=0.80) methods respectively as well as Matiyas Test were applied for the assessment. A 3-grade scale including good, fair and poor was used for classification and those classified as good were regarded normal and those classified as fair or poor were considered as abnormal. Data were analyzed by SPSS 14. Findings 91.3% of the subjects suffer at least from one of spinal cord abnormalities. The most common condition was falling shoulders (74.2%) and the least frequent was pelvic obliquity (2.5%). Matiyas test was negative in 58.8% (not able to remain in requested position). 33.3% was overweight and obese in terms of body mass index (BMI). ConclusionThe results showed that the prevalence of spinal cord abnormalities in the subjects was very high (91.3%) mostly due to poor mobility, weakness in the muscles of upper extremities particularly those holding the spine and lack of exercise. Thus, planning for physical activities and exercise in the leisure time of students seems essential. Keywords: Spinal cord, Spinal cord abnormalities, Exercise, Scoliosis. *Corresponding Author: Mohammad Rashidi. Dept. of Physical Education, Islamic Azad University, Semnan, Iran. E-mail: [email protected]
Study of heat and mass transfer with Joule heating on magnetohydrodynamic (MHD) peristaltic blood flow under the influence of Hall effect
No full textIn this article, heat and mass transfer with Joule heating on magnetohydrodynamic (MHD) peristaltic blood under the influence of Hall effect is examined. Mathematical modelling is based on momentum, energy and concentration which are taken into account using ohms law. The governing partial differential equations are further simplified by neglecting the inertial forces and long wavelength approximations. Exact solutions have been presented for velocity, temperature and concentration profile. The influence of all the physical pertinent parameters is taken into account with the help graphs. It is found that Hartmann number and Hall parameter shows opposite behaviour on velocity, temperature and concentration profile. It is worth mentioning that pressure rise also depicts opposite behaviour for Hartmann number and Hall parameter. The present analysis is also presented for Newtonian fluid (α→0) as a special case for our study. It is observed that Hall Effect and magnetic field shows opposite behaviour on velocity and temperature profile. Temperature profile increases due to the increment in Prandtl number and Eckert number. Numerical comparison is also presented between the existing published results by taking α=0,M=0 as a special case of our study
A Novel Analytical Solution of the Thermal Boundary-Layer over a Flat Plate with a Convective Surface Boundary Condition Using DTM-Padé
No full textThermal convection of nano-liquid in an electronic cabinet with finned heat sink and heat generating element
No full textDevelopment of electronic devices depends on cooling techniques. An efficiency of cooling methods can be improved using more effective heat-transfer fluids and extended heat-exchange surfaces. Free convection of alumina nanoliquid in a chamber with a copper finned thermal sink and a thermally-producing unit is simulated in the present research. Basic equations written by means of non-dimensional non-primitive characteristics have been solved using the finite difference method. Influences of the Rayleigh number, fins height and nanoparticles concentration on energy transport and flow structures within the chamber have been scrutinized. It has been ascertained that a rise of the fins height and particles concentration intensifies the heat removal from the heated source
Numerical simulation of Fluid flow over a shrinking porous sheet by Successive linearization method
No full textAbstractIn this article, stagnation point flow of a Maxwell fluid over a shrinking porous sheet is considered. The governing partial differential equations are reduced to ordinary differential equations by using similarity transformations. The solution of the resulting nonlinear boundary value problem is calculated with the help of Successive linearization method (SLM) using computational software Matlab. The present analysis confirmed the existence of dual solution for shrinking sheet, while for stretching case the solution is unique. The effects of suction parameter S on the velocity profiles are shown through graphs and analyzed in detail
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