Objective: In recent years, farmers have shown great interest to using native drill planter rather than complex planters to grow vegetables. Methods: In this study, we tested a native planter Independent variables were the two types of substrate surface (asphalt and plowed field), three ground speed (3, 5 and 7 kph) and four types of seeds (tomatoes, onions, radishes and lettuce). Dependent var...

near-fault ground motions have caused very much damage in the vicinity of seismic sources during recent earthquakes. it is well known that under specific circumstances, intensive ground shakings near fault ruptures may be characterized by short-duration impulsive motions. this pulse-type motion is generally particular to the forward direction, where the fault rupture propagates towards the site...

The interaction of a helicopter rotor with the ground in hover flight is addressed numerically using hybrid Eulerian–Lagrangian CFD model. When takes off or lands, its wake interferes ground. This interaction, depending on height-to-rotor diameter ratio, causes altering loading and performance as compared to unconstrained case gives rise development complex outwash flow field surrounding helico...

We have studied the electronic structure of Mn impurities in GaAs by Mn 2p core-level photoemission spectroscopy. From cluster-model analysis assuming the neutral (Mn) or negatively ionized (Mn) ground state, electronic structure parameters have been obtained. In either case, the Mn d electron number is evaluated to be ;5 using the obtained parameters, meaning that the neutral Mn impurity, if i...

2014 ACO synchrotron radiation has been used to obtain photoelectron spectra of the outer shell of xenon in the 75-100 electron volts energy range. Satellite peaks corresponding to the formation of excited ionic states have been observed, in addition to the main peaks corresponding to the production of the 5s2 5p5 2P and 5s 5p6 2S states of Xe+. A comparison is presented of the intensities of t...

High precision acquisition of atmospheric parameters from the air or space by means of lidar requires accurate knowledge of laser pointing. Discrepancies between the assumed and actual pointing can introduce large errors due to the Doppler effect or a wrongly assumed air pressure at ground level. In this paper, a method for precisely quantifying these discrepancies for airborne and spaceborne l...

Various applications of lasers to electric propulsion problems have previously been made, and laser techniques are potentially powerful means to address and resolve a range of current issues. Studies with sufficiently high resolution and sensitivity to reveal the fine details of velocity, density, and temperature distributions for trace species will be especially valuable. Continuous narrowband...

2014 The system CaF2 : Fe2+ has been studied by Mössbauer spectroscopy in the slow relaxation regime (4.2-14 K). Far infrared experiments have been performed in the 1.5-35 K temperature range and at 1.5 K in an external magnetic field up to 8 T. From both Mössbauer and far infrared results, one can deduce that the average distance between the spin-orbit levels within the Eg state is K = 17 cm-1...

The ariat ional approach i s adopted t o describe massand spin-density fluctuations in poY larized 1 iquid He. The ground s t a t e i s approximated by a suitable Jastrow-Slater wave function which incorporates the ef fec ts of spatial correlations. The newly developed Fermi-hypernetted chain theory i s employed to analyse the associated theoretical par t ic le and spin-dependent structure func...

2D electrophoresis is a well known method for protein separation which is extremely useful in the field of proteomics. Each spot in the image represents a protein accumulation and the goal is to perform a differential analysis between pairs of images to study changes in protein content. It is thus necessary to register two images by finding spot correspondences. Although it may seem a simple ta...