Scaling Laws for One- and Two-Dimensional Random Wireless Networks in the Low-Attenuation Regime

The capacity scaling of extended two-dimensional wireless networks is known in the high-attenuation regime, i.e., when the power path loss exponent alpha is greater than 4. This has been accomplished by deriving information-theoretic upper bounds for this regime that match the corresponding lower bounds. On the contrary, not much is known in the so-called low-attenuation regime when 2lesalphales4. (For one-dimensional networks, the uncharacterized regime is 1lesalphales2.5.) The dichotomy is due to the fact that while communication is highly power-limited in the first case and power-based arguments suffice to get tight upper bounds, the study of the low-attenuation regime requires a more precise analysis of the degrees of freedom involved. In this paper, we study the capacity scaling of extended wireless networks with an emphasis on the low-attenuation regime and show that in the absence of small scale fading, the low attenuation regime does not behave significantly different from the high attenuation regime.     

Monte Carlo method for transient eddy-current calculations

This paper deals with the calculation of transient eddy currents by a Markov chain Monte Carlo (MCMC) method. After we illustrate the principle in a one-dimensional calculation, we treat a two-dimensional problem. Then, we show simulation results and we discuss advantages and disadvantages of this method. An important advantage is that MCMC methods can be more efficient than finite-element methods in transient problems because they give an estimate of the solution at a point in space without calculation of the whole field distribution.     

Improvement of YBCO Superconductor Magnetic Shielding by Using Multiple Bulks

HTS bulks present a high critical current density which can be used as magnetic shields. Previous works showed that BSCCO bulks can screen magnetic fields up to 0.1 T. For large scale applications like electrical machines, stronger magnetic field is usually needed. In so doing, (RE)BCO materials are more suitable since they can shield much higher magnetic fields. Another key issue concerns the size of the bulks. Nowadays, it is possible to manufacture 150-mm diameter class cylindrical YBCO bulk. In order to get larger magnetic shielding areas, multiple bulk superconductors should be arrayed and stacked in layers. This paper presents experimental results on screening performances of layered YBCO pellets. These results are compared with 2D simulations. The experiments are carried out at 77 K under external magnetic fields of 150 mT. Different topologies are considered: single-layer configuration with 9 square pellets and double-layer configuration with respectively 9 and 4 square pellets. Experimental and simulation results show that a checkerboard of one layer configuration does not fully shield the external magnetic field. Improved shielding properties are obtained when the double-layer configuration is used.     

Time-domain surface impedances of lossless Debye media

In a previous paper, a surface impedance formalism was given. Its application to interfaces modelling between homogeneous and frequency dependent media, was of great interest in the finite difference timedomain (fdtd) codes. In this paper, an extension of the method to dispersive media is presented. Applying this formalism to lossless Debye medium, the analytical expressions of the time- domain surface impedances are given. The implementation in a fdtd code permits then a numerical verification of the results in relation to the Fresnel method.     

Influence of hairdressing on the psychological mood of women

Synopsis
A questionnaire, specially designed to measure the mood change was filled in by 359 women at their arrival in different hair-salons and after having received various hair care services. The results show that hair treatments increase all the positive dimensions of mood and decrease all the negative ones. Only the improvement in sociability appears to be linked to age.
Résumé
Un questionnaire particulier a été mis au point pour enregistrer le changement d'humeur de 359 femmes entre leur arrivée dans des salons de coiffure, où elles ont reçu divers traitements capillaires, et leurs départs. Les résultats démontrent que toutes les dimensions positives de l'humeur augmentent alors que toutes les dimensions négatives diminuent. Seule l'amélioration de la sociabilité est modulée par l'âge.     

NARP-HPLC/MS and silver cationization fingerprinting of triacylglycerols in wild and cultivar Tunisian peanut kernels

A simple strategy to identify triacylglycerols (TAGs) in wild and cultivar peanuts was performed using on line coupling of non-aqueous reversed phase chromatography-electrospray ionization–mass spectrometry (NARP-LC-ESI–MS) with silver nitrate (AgNO₃) as a post-column additive. The combination of the structural information given by MS with chromatographic retention laws led to the determination of the structure of TAGs in wild and cultivar peanut oil. In addition, by using the MS⁵ method, the regio-specificity of the TAGs was determined. It was also demonstrated that in Tunisian peanut oil, the saturates have a preference for the sn-1/sn-3 position for the arachidonic and behenic acids. In the wild variety fatty acids with odd numbers of carbons were found and more TAGs were identified in comparison to the cultivar peanut oil.     

Effect of tip shape in the design of long distance electrostatic force microscopy

In this paper, it is shown that the tip as well as the cantilever (both conducting) act on the electrostatic force. The experimental results on force versus distance agree with the simulations derived from the Equivalent Charge Model. These simulations allow to determine the influence of geometry of the tip and bending of cantilever on the force exerting on the sensor. So, we predict the tip design and operating conditions (detection mode) to achieve the best resolution, particularly in long distance tip-sample in Electrostatic Force Microscopy.     

A computational skin model: fold and wrinkle formation

This paper presents a computational model for studying the mechanical properties of skin with aging. In particular, attention is given to the folding capacity of skin, which may be manifested as wrinkles. The simulation provides visual results demonstrating the form and density of folds under the various conditions. This can help in the consideration of proper measures for a cosmetic product for the skin.     

Superconducting Multistack Inductor for Synchronous Motors Using the Diamagnetism Property of Bulk Material

An original superconducting synchronous motor topology is presented. The inductor combines both bulk materials and wires to create an alternating magnetic field in the air gap of the motor. A prototype that uses NbTi superconducting wires and YBCO bulks has successfully been designed and constructed. Test results are presented. In the second part of this paper, the possibility of higher power motor is discussed. To do so, the active length needs to be increased. In this paper, a multistack structure is proposed, and computation results show the effectiveness of the suggested approach.     

Per operative localization of a carcinoid tumour of the breast using indium-111 pentetreotide and a nuclear surgical probe

A 69-year-old woman presented with a single enlarged lymph node in the left axilla. Clinical examination and other investigations, including various imaging methods, failed to reveal the primary tumour. However, indium-111 pentetreotide scan revealed a site of uptake in the anterior region of the left thorax. Peroperative imaging with 111In-pentetreotide confirmed the tumour uptake and use of a nuclear surgical probe allowed precise localization of the tumour, which was completely resected.