137 research outputs found
Measurements of turbulent flow in a suddenly expanding flume with a rough bottom
No full textSome measurements were conducted in a suddenly expanding flume with a rough bottom. In the approach flume, the friction velocity was determined in three ways and the distributions of turbulence intensities and Reynolds stress in a vertical were obtained. The measurement of the separating turbulent flow comprised the distribution of depth-averaged velocity and turbulence quentities (u', v', -uv and u^2 +v^2) in the separation region and the vertical distribution of turbulence quentities in the mixing layer. To measure instantaneous velocity components a Laser Doppier Velocimeter and a Data Acquisition System were employed. The data were processed using a digital filter.Hydraulic EngineeringCivil Engineering and Geoscience
Experiments and computations on unsteady separating flow in an expanding flume
No full textAn unsteady, separating flow with a free surface was investigated with a physical model and a numerical model. To simulate tidal flow, the prescribed flow rate at the inflow boundary was a half-period sine function of time. Measurements of velocities and wave heights were conducted by using LDV and a wave-height meter in a straight open channel with a sudden widening and a non-reflective outlet. Distributions of depth-averaged velocities at different times were obtained. Numerical simulation of this flow was carried out using a computer programme of second-order accuracy. The development of the recirculation region in course of time was well simulated, and the observed splitting of the main eddy in a later phase of the experiment and the secondary eddy in the concave corner were reproduced. The computational results are markedly influenced by the boundary conditions at closed boundaries and the eddy viscosity applied.Hydraulic EngineeringCivil Engineering and Geoscience
Single-electron charging and detection in a laterally coupled quantum-dot circuit in the few-electron regime
Get PDFApplied Science
Second female case of Myhre syndrome
No full textMyhre syndrome is a rare disorder characterized by low birthweight, short stature, mental retardation, facial dysmorphism (blepharophimosis, midfacial hypoplasia, prognathism), heart anomalies, muscle hypertrophy, decreased joint mobility and deafness. To date 11 male cases and only one female case have been reported. This paper describes the second female case and compares the clinical and radiological findings between female and male patients. © 2004 Lippincott Williams & Wilkins
Measurements of K-shell ionization cross sections of Fe, Ni, and Zn by 7–29 keV electron impact using the thick-target method
Get PDFThe measurements of K-shell ionization cross sections for Fe, Ni and Zn elements were performed using 7-29 keV electron impact on the thick targets. The Monte Carlo simulations were employed to correct the effects due to the multiple-scattered electrons and bremsstrahlung photons as well as other secondary particles within the thick targets. The so-called Tikhonov regularization method was adopted to deal with the ill-posed inverse problem involved in the thick-target method. The experimental results were compared with the DWBA and PWBA- C-Ex predictions as well as existing experimental data from the literature. It has been observed that our experimental data is in better agreement with the theoretical results based on the DWBA model developed by Bote et al.The presentation of the authors' names and (or) special characters in the title of the pdf file of the accepted manuscript may differ slightly from what is displayed on the item page. The information in the pdf file of the accepted manuscript reflects the original submission by the author
Scientific misconduct encountered by APAME journals: an online survey
No full textIn June 2015, invitations were sent by email to 151 APAME journals to participate in an online survey with an objective of gaining insight into the common publication misconduct encountered by APAME editors. The survey, conducted through SurveyMonkey over a 20-day-period, comprised 10 questions with expansions to allow anecdotes limited to 400 characters, estimated to take less than 10 minutes to complete. Only one invitation was issued per journal, targeting (in order of priority) editors, editorial board members and editorial staff, and limited by email availability. 54 (36%) journals responded. 98% of respondents held Editor or Editorial Board positions. All respondent journals have editorial policies on publication ethics and 96% provide instructions related to ethics. 45% use anti-plagiarism software to screen manuscripts, the most popular being iThenticate, CrossCheck and Turnitin. Up to 50% of journals had encountered studies without IRB approval. Author misconduct encountered were (in rank order): plagiarism (75%), duplicate publication (58%), unjustified authorship (39%), authorship disputes (33%), data falsification (29%), data/image manipulation (27%), conflict of interest (25%), copyright violation (17%) and breach of confidentiality (10%). Reviewer misconduct encountered were: conflict of interest (19%), plagiarism (17%), obstructive behavior (17%), abusive language (13%) and breach of confidentiality (13%). Notwithstanding the limitations of the survey and the response rate, a few insights have been gained: (1) the need for strengthening the ethical culture of researchers/authors and reviewers, (2) anti-plagiarism software can improve plagiarism detection by about 15%, and (3) the need for technical support to detect plagiarism, duplicate publication and image manipulation
Dielectric properties of CaCu3Ti4O12 based multiphased ceramics
Get PDFA “soft chemistry” method, the coprecipitation, has been used to synthesize the perovskite CaCu3Ti4O12 (CCT). Three main types of materials were obtained for both powders and sintered ceramics: a monophased consisting of the pure CCT phase, a biphased (CCT + CaTiO3), and a three-phased (CCT + CaTiO3 + copper oxide (CuO or Cu2O)). These ceramics, sintered at low temperature, 1050 °C, present original dielectric properties. The relative permittivity determined in the temperature range (−150 < T < 250 °C) is significantly higher than the one reported in the literature. Internal barrier layer capacitor is the probable mechanism to explain the particular behaviour. Moreover, the presence of a copper oxide phase beside the perovksite CCT plays an important role for enhancing the dielectric properties
Engineering the quantum point contact response to single-electron charging in a few-electron quantum-dot circuit
No full textWe show that the design of a quantum point contact adjacent to a quantum dot can be optimized to produce maximum sensitivity to single-electron charging in the quantum dot. Our analysis is based on the self-consistent solution of coupled three-dimensional Kohn-Sham and Poisson equations for the quantum circuit. We predict a detection sensitivity increase by at least 73% over the conventional design.Kavli Institute of NanoscienceApplied Science
Familial iridogoniodysgenesis and skeletal anomalies: a probable new autosomal recessive disorder
No full textThree sibs with congenital glaucoma, skeletal anomalies, and peculiar facial appearance were studied. At birth, enlarged eyes and corneae were present in the proposita and her two brothers due to congenital glaucoma secondary to iridogoniodysgenesis (IGD). The purpose of this article is to describe the second familial case with IGD and skeletal anomalies as the family previously described by Garc� a-Cruz et al. in 1990, corroborating this new distinct dysmorphic syndrome with probable autosomal recessive inheritance. � Blackwell Munksgaard, 2004
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