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排序方式: 共有192条查询结果,搜索用时 31 毫秒
1.
Wail Mardini Yaser Khamayseh Abdalrhman Abdalkareem Almodawar Ehab Elmallah 《Peer-to-Peer Networking and Applications》2016,9(6):991-1004
Range of applications for Wireless Sensor Networks (WSNs) is increasing rapidly. One class of such applications is Energy-Aware Wireless Positioning Systems for situation awareness. Localization deals with determining a target node’s position in WSN by analyzing signals exchanged between nodes. Received Signal Strength Indicator (RSSI) represents the ratio between received signal power and a reference power, and is typically used to estimate distances between nodes. RSSI distance estimations are affected by many factors. This paper aims to enhance the accuracy of RSSI-based localization techniques in ZigBee Networks through studying the communication channel status between two nodes. As the network nodes are exposed to high noise levels, position estimation accuracy deteriorates. A novel adaptive localization scheme is proposed; Two-State Markov model with moving average is employed to detect unpredictable RSSI readings that may reflect badly on the estimation. The proposed scheme achieves better estimation accuracy, for example, the estimation error was reduced from 11.7 m to just 3 m using the proposed scheme. 相似文献
2.
3.
Active Management Framework for Distributed Multimedia Systems 总被引:17,自引:0,他引:17
Ehab Al-Shaer 《Journal of Network and Systems Management》2000,8(1):49-72
4.
Ehab A. Sobhy Ahmed M. Soliman 《International Journal of Circuit Theory and Applications》2010,38(5):441-452
Three novel CMOS realizations for the fully differential voltage second‐generation inverting current conveyor (FDVCCII‐) are proposed in this paper. The first realization has a limited input range, and the other two realizations have a rail to rail input range and show excellent features in linearity and bandwidth. As an application to the FDVCCII‐, a floating gyrator is proposed. A floating inductor is realized using the floating gyrator and it is used in realizing a second‐order low‐pass filter, which is simulated and compared with the ideal result. All circuits are simulated with SPICE using CMOS 0.35µm technology and supply voltages ±1.5V to verify the theoretical results. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
5.
This paper addresses the optimal distributed generation sizing and siting for voltage profile improvement, power losses, and total harmonic distortion (THD) reduction in a distribution network with high penetration of non-linear loads. The proposed planning methodology takes into consideration the load profile, the frequency spectrum of non-linear loads, and the technical constraints such as voltage limits at different buses (slack and load buses) of the system, feeder capacity, THD limits, and maximum penetration limit of DG units. The optimization process is based on the Genetic Algorithm (GA) method with three scenarios of objective function: system power losses, THD, and multi-objective function-based power losses and THD. This method is executed on the IEEE 31-bus system under sinusoidal and non-sinusoidal (harmonics) operating conditions including load variations within the 24-hr period. The simulation results using Matlab environment show the robustness of this method in optimal sizing and siting of DG, efficiency for improvement of voltage profile, reduction of power losses, and THD. A comparison with particle swarm optimization (PSO) method shows that the proposed method is better than PSO in reducing the power losses and THD in all suggested scenarios. 相似文献
6.
Dr. Remya Rajan Dr. Dirk Schepmann Ruben Steigerwald Dr. Julian A. Schreiber Dr. Ehab El-Awaad Prof. Joachim Jose Prof. Guiscard Seebohm Prof. Bernhard Wünsch 《ChemMedChem》2021,16(20):3201-3209
Recent studies have shown the involvement of GluN2A subunit-containing NMDA receptors in various neurological and pathological disorders. In the X-ray crystal structure, TCN-201 ( 1 ) and analogous pyrazine derivatives 2 and 3 adopt a U-shape (hairpin) conformation within the binding site formed by the ligand binding domains of the GluN1 and GluN2A subunits. In order to mimic the resulting π/π-interactions of two aromatic rings in the binding site, a [2.2]paracyclophane system was designed to lock these aromatic rings in a parallel orientation. Acylation of [2.2]paracyclophane ( 5 ) with oxalyl chloride and chloroacetyl chloride and subsequent transformations led to the oxalamide 7 , triazole 10 and benzamides 12 . The GluN2A inhibitory activities of the paracyclophane derivatives were tested with two-electrode voltage clamp electrophysiology using Xenopus laevis oocytes expressing selectively functional NMDA receptors with GluN2A subunit. The o-iodobenzamide 12 b with the highest similarity to TCN-201 showed the highest GuN2A inhibitory activity of this series of compounds. At a concentration of 10 μM, 12 b reached 36 % of the inhibitory activity of TCN-201 ( 1 ). This result indicates that the [2.2]paracyclophane system is well accepted by the TCN-201 binding site. 相似文献
7.
ABSTRACT A multistage system comprising an upflow anaerobic sludge blanket (UASB) followed by anoxic unit and then oxic activated sludge (AS) with biofilm is studied in El-Berka WWTP, Egypt. Different organic loading wastewaters of chemical oxygen demand (COD) less than 500 mg/L till 3000 mg/L are tested during the study. The hydraulic retention time (HRT) varies for each loading from 7.5 to 10 to 15 h. The UASB reactor accomplishes the removal efficiency of 50%–70% of influent COD. The overall system performs the removal efficiency of 95% of influent COD and NH4-N. Also, the results are verified by a modified mathematical model. 相似文献
8.
This paper investigates the nonlinear behavior of concrete-filled high strength stainless steel stiffened slender square and rectangular hollow section columns. The stiffened slender tubes had overall depth-to-plate thickness (D/t) ratios ranging 60–160. The concrete strengths covered normal and high-strength concrete. The investigation focused on short axially loaded columns. A nonlinear finite element (FE) model has been developed to study the behavior of the concrete-filled stiffened tube columns. A parametric study was conducted to investigate the effects of cross-section geometry and concrete strength on the behavior and strength of the columns. The results of the concrete-filled stiffened tube columns were compared with the results of the companion concrete-filled unstiffened tube columns. It is shown that the concrete-filled stiffened slender tube columns offer a considerable increase in the column strength and ductility than the concrete-filled unstiffened slender tube columns. The column strengths obtained from the FE analysis were compared with the design strengths calculated using the American specifications and Australian/New Zealand standards. A design equation was proposed for concrete-filled stainless steel stiffened slender tube columns. It is shown that the proposed modified equation provides more accurate design strengths compared to the American and Australian/New Zealand predictions. 相似文献
9.
给出了偏心受压下外包混凝土组合钢柱的3维非线性模型。该组合柱两端铰接,沿主要轴线方向施加一个偏心力。此偏心率的范围在柱截面总高度的0.125~0.375之间。该模型考虑钢、混凝土、纵向和横向钢筋的非弹性性能,以及组合柱中混凝土的约束作用。考虑了钢与混凝土之间、纵向与横向钢筋之间、钢筋与混凝土之间交界面粘结力,以及不同材料对组合柱抵抗变形所起的作用。该模型考虑了初始几何缺陷。已有的试验数据证明了模型的有效性。混凝土强度等级为30~110MPa。钢截面的屈服应力为275~690MPa。通过改变偏心率、柱的尺寸、结构钢尺寸与屈服应力值和混凝土强度,以确定其对偏心受压下组合柱性能的影响。结果显示,结构钢屈服应力的增加对组合柱强度的影响较大,尤其当柱的偏心率为0.125D时。当柱的偏心率为0.375D且混凝强度低于70MPa时,结构钢屈服强度的变化对柱强度影响较大。将数值分析所得组合柱的强度与设计规范Eurocode4的计算结果进行比较。结果表明,Eurocode4准确地计算出偏心组合柱强度,但是估算的弯矩过大。 相似文献
10.
Ehab Abdel-Rahman Amr Shaarawi 《Journal of Materials Science: Materials in Electronics》2009,20(Z1):153-158
The properties of one-dimensional periodic and quasiperiodic photonic crystals with a defect layer have been investigated.
Transfer matrix method (TMM) has been used throughout this study. For periodic photonic crystals, results demonstrate the
independence of the defect mode frequency on the defect layer while the defect mode transmission coefficient varies with the
position of the defect layer position. On the other hand, defect mode frequency is not that responsive to the index of refraction
of the defect layer. The quality factor of the defect mode has been studied as a function of the defect layer position as
well as its thickness. For quasiperiodic photonic crystals, the frequency of the defect mode is very sensitive to the defect
layer position as well as its thickness. An enhancement of the quality factor of the defect mode has been observed. This study
may be valuable in designing optical devices and it may also provide a more accurate method to measure the index of refraction. 相似文献