Papers by Keyword: Mobility

Abstract: Hexadecafluorophthalocyanine (F₁₆CuPc) and Cobalt phthalocyanone (CoPc) thin films of different thickness (20-200nm) have been grown by Molecular Beam Epitaxy (MBE) using different deposition rate (0.2 – 1.0 Å/s). For nanowire type growth lower deposition rate and for films of smooth surface higher deposition rate are found suitable. Charge transport (J~V) of CoPc and F₁₆CuPc films is governed by bulk-limited processes with a bias dependent crossover from Ohmic to trap-free space-charge-limited conduction. The mobility (μ) values at 300 K were found 4.5 and 5.5 cm2 V−1 s−1 for CoPc and F₁₆CuPc films respectively. Mechanism of reverse rectification behavior of an organic heterojunction comprising of CoPc and F₁₆CuPc is explained by Kelvin Probe measurement.

Abstract: Currently led military operations (Iraq and Afganistan) have shown that one of the biggest threats for vehicles moving in convoys are Improvised Explosive Devices. On the basis of experiments, it was found that there are not such structures which are completely resistant to explosion. The paper describes the concept for arms of suspension system with specially reduced construction node which undergo a controlled destruction at the time of detonation. Designing the target elements requires tests in order to determine the service load for suspension system..

Abstract: The paper describes the wheeled rescue robot FRR drawn up by a team of Engineering Machines and Robots at Military University of Technology. It also shows a brief description of predicted for implementation tasks by FRR and probable problems that might occur and should be solved. Next the paper describes the method and the model which served to simulation evaluation of rigidity for robots suspension system. Describing the simulation model, used simplified assumptions and the method of calculating the basic parameters for model were described. The following chapter presents simulation that the model was tested through and some model results of the test. In the final phase of the article the conclusion and discussion is presented.

Abstract: Photoconductance measurements have been one of the most common ways to measure the lifetime in silicon for over 60 years. Since 1985, the most common method for doing calibrated lifetime measurements is using an eddy-current sensor to monitor photoconductance as a function of time and illumination, providing data that can be interpreted in terms of carrier density and hence lifetime. Here we present recent extensions to this measurement technique that have generalized the method. Bulk lifetime measurements on industrial samples are presented. The information available from the effects of grain boundaries on eddy-current measurements are summarized. Recent applications for the use of these instruments for measurement of mobility in compensated materials are also described.

Abstract: This paper proposes a new intelligent video surveillance system based on Android phone. By using Android phone, this system can be deployed easily and quickly. Compare with the traditional surveillance system, this new one uses Android phone to replace the large and expensive surveillance cameras. In addition, the functions of back-end equipment of the traditional system have been moved to the front-end equipment. With a modified invasion detection algorithm, the front-end equipment becomes more intelligent. This schema can significantly increase the mobility and flexibility of the entire system. Therefore this system will have a better performance dealing with emergencies in different surveillance scenarios. Moreover, this state-of-art intelligent video surveillance system not only brings a new method for surveillance, but also advances the development of surveillance techniques.

Abstract: Based on SiGe virtual substrate technology, a high-performance strained NMOS is obtained. By growing 2~3μm SiGe relaxed layer, 100~200nm strained SiGe layer and 20nm strained silicon layer, and also forming a P-well by multiple implantation technology, a surface strained NMOS is fabricated. Finally, Measured results shown that drain-source current and the low field maximal mobility of the strained NMOS are enhancement of up to 190% at Vgs=3.5V, which is almost three times to the value of common Silicon NMOS and is also better than the 170% reported in public.

Abstract: This paper offers researchers in transport engineering a method for reducing urban traffic congestion by planning for pedestrians. The method is designed for cities where GIS data is unavailable. Showing how this data can be obtained is one of the major contributions to the field. Other contributions are: using density data instead of infrared imagery to populate housing units with the number of inhabitants, performing network analysis instead of buffer analysis, eliminating homogeneity errors of the density dataset and offering a quantitative way of evaluating new investments in pedestrian infrastructure. The method is applied on a case study, namely the Romanian city of Timisoara. The conclusions present some applications of this technology and underline the importance of teaching it in engineering.

Abstract: The most basic understanding for a new mechanism is to realize its mobility. But there is little theory about mobility of hybrid mechanism in kinematics. Due to the complexity and particularity of hybrid mechanisms, the mobility of hybrid mechanisms cannot be obtained based on traditional methods. In the paper, the constraint and mobility of a dendritic-hybrid mechanism is analyzed based on screw theory. The complicated loops in the dendritic-hybrid mechanism are regarded as generalized kinematic chains, which can simplify the hybrid mechanism and correctly receive the number and characteristic of mobility.

Abstract: The mobile grids bring some additional features into the grid, such as mobility, energy-constrained, etc. And the task scheduling becomes a more challenge thing. We propose a mobile grid task scheduling model considering the mobility of both user and resource, and the resource energy consumption. Through analyzing the architecture of mobile grid, a mathematical model is built to calculate the average distance between the resource and Base Station (BS). Then, it can decide which mobile grid the mobile devices are apt to stay in, which can deal with the mobility of mobile devices. On the other hand, the resource energy consumption is also considered, which ensure that the resources have enough energy to finish the task. As a result, the task can be assigned to the best resources in the suitable mobile grids. The failures may happen in the task scheduling because of many unpredictable factors. So the fault-tolerance scheme based on the notion of replication is proposed.

Abstract: The thin films of compound 2,7-dihexyl-4,9-dihydro-s-indaceno [1,2-b:5,6-b']- dithiophene-4,9-dione were grown by physical vapor growth at different substrate temperatures. The morphology of surfaces was characterized by atomic force microscope and X-ray diffraction, which exhibits increased crystal grain size and film order with the increase of substrate temperature. The molecule exhibits layer-by-layer packing on the Si/SiO₂ substrate and the tilt angle with respect to the substrate is 49.5°, which form extended slipped face-to-face π-stacking in each layer. This result indicates that molecular packing in the thin film is similar to that in the single crystal. The organic field-effect transistors (OFETs) incorporating this compound shows a field effect mobility at the order of 10^-3 cm²V^-1s^-1 and an on-off ratio of 4 × 10⁶ with good air-stability.