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排序方式: 共有58条查询结果,搜索用时 12 毫秒
1.
Bioceramic foams have been applied for drug releasing agents, cell loading, and widely for hard tissue scaffold. The aim of this study was fabrication and characterization of nanostructure bioceramic composite foam (BCF) consisting of hydroxyapatite (HA) and bioactive glass (BG) via gelcasting method for applications in tissue engineering. X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) analysis techniques were utilized in order to evaluate respectively, phase composition, dimension, morphology, and interconnectivity of pores, and particle size of synthesized HA, BG, and BCF. The results showed that fabrication of the BCF with a particle size in the range 20-42 nm and pore size in the range 100-250 μm was successfully performed. The maximum values of compressive strength and elastic modulus of the BCF were found to be about 1.95 MPa and 204 MPa, respectively, related to a sample sintered at 900 °C for 4 h. The mean values of the true (total) and apparent (interconnected) porosity were calculated in the range 86-91% and 60-71%, respectively. It seems that the measured properties make the BCF a good candidate for tissue engineering applications, preferentially in drug delivery, cell loading, and other nonloading applications. 相似文献
2.
Chong Han Zhanoning Yang Bin Chen Huang A.Q. Bin Zhang Ingram M.R. Edris A.-A. 《Industry Applications, IEEE Transactions on》2007,43(2):378-385
As an industry customer of electric power, an electrical arc furnace (EAF) is a major flicker source that causes major power quality problems. For a 40-MVA EAF in Tennessee, USA, a cascade-multilevel converter (CMC)-based STATic synchronous COMpensator (STATCOM) with high bandwidth is proposed for EAF flicker mitigation. In this paper, flicker mitigation techniques by using a CMC-based STATCOM are presented and verified through a transient network analyzer (TNA) system. The required STATCOM capacity is first studied through a generalized steady-state analysis. Second, the STATCOM control strategy for flicker mitigation is introduced, and simulation results are given. Finally, a TNA system of the STATCOM and an EAF system are designed and implemented. Experimental results from the TNA test show that the proposed CMC-based STATCOM and its controller can efficiently and rapidly mitigate the EAF flicker 相似文献
3.
A multi-objective control strategy for grid connection of DG (distributed generation) resources 总被引:2,自引:0,他引:2
Edris Pouresmaeil Daniel Montesinos-Miracle Oriol Gomis-Bellmunt Joan Bergas-Jan 《Energy》2010,35(12):5022-5030
This paper presents a flexible control technique for connection of DG (distributed generation) resources to distribution networks, especially during ride-through on faulty grid. This strategy is derived from the abc/αβ and αβ/dq transformations of the ac system variables. The active and reactive currents injected by the DG source are controlled in the synchronously rotating orthogonal dq reference frame. The transformed variables are used to control the VSI (voltage source inverter) which connects the DG to the distribution network. Using a P.L.L. (phase locked loop) in circuit of proposed control technique, the angle of positive sequence has been detected, in order to synchronize the currents to the distribution network. The proposed control technique has the capability of providing active and reactive powers and harmonic currents to nonlinear loads with a fast dynamic response. Simulation results and mathematical analysis have been completed in order to achieve a reduced THD (total harmonic distortion), increased power factor and compensated load’s active and reactive powers. The analyses show the high performance of this control strategy in DG applications in comparison with other existing strategies. 相似文献
4.
In this investigation, the headspace volatiles of treacle samples from three different producers were subjected to GC-MS and HPLC analysis in order to assess the variation in their aroma volatile composition and their content of 5-hydroxymethylfurfural (HMF). The volatile constituents were rich in aliphatic short chain acids, specially acetic acid, alcohols, aldehydes, ketones, and furan derivatives. The HMF content varied according to the producer from 66 mg/kg to 179 mg/kg. The present investigation is considered to be the first, which determine the volatile aroma profile and HMF content for treacle. 相似文献
5.
Centeno V. Phadke A.G. Edris A. Benton J. Gaudi M. Michel G. 《Power Delivery, IEEE Transactions on》1997,12(1):61-71
The paper describes the development of an adaptive out-of-step relay, from the formulation of its concept to its field implementation at the Florida-Georgia interface. Adaptive relaying seeks to make adjustments to the relay characteristics as power system conditions change, thereby making the relay more attuned to the prevailing power system conditions. The work described here began as a theoretical examination of the out-of-step relaying application, its possible shortcomings, and the opportunities to make adaptive improvements. It is shown that for a system that behaves primarily as a two-machine power system, the out-of-step relay could be made more secure by applying the principle of equal area criterion. The paper describes the theory of such a relay, its hardware configuration, and the system as it is installed in the field. The newly developed technology of synchronized phasor measurements plays an important role in the realization of this relay. The paper includes a summary of the field experience gathered over a period of one year 相似文献
6.
Juan C. Trujillo Caballero Oriol Gomis-Bellmunt Daniel Montesinos-Miracle Rubén Posada-Gómez Edris Pouresmaeil J. A. Aquino-Robles 《电力部件与系统》2014,42(2):165-179
This article proposes a digital control scheme to operate a proton exchange membrane fuel cell module of 1.2 kW and a super-capacitor through a DC/DC hybrid converter. A fuel cell has been proposed as a primary source of energy, and a super-capacitor has been proposed as an auxiliary source of energy. Experimental validation of the system implemented in the laboratory is provided. Several tests have been performed to verify that the system achieves excellent output voltage (V0) regulation and super-capacitor voltage (VSC) control under disturbances from fuel cell power (PFC) and output power (P0) as well as other perturbations described in analysis results. 相似文献
7.
Since the discovery in 1970 that subsynchronous resonance (SSR) was the main cause of the shaft failures at the Mohave plant in Southern Nevada, extensive research and development efforts have been devoted to the development of effective SSR mitigation measures. This paper presents a contribution to these efforts by providing a new concept for simple and reliable SSR mitigation. The basic idea is to reduce the energy exchange between the two sides of turbine-generator sets at subsynchronous oscillations by weakening the electromechanical coupling. This is attained by creating phase imbalance at subsynchronous oscillations. The imbalance diminishes the capability of the three phase currents to develop interacting electromagnetic torques and, therefore, suppresses energy exchange between the electrical and mechanical sides of turbine-generator sets. The objective of this paper is to study the influence of having the phase imbalance associated with the generator to be protected from potential torsional interaction problems 相似文献
8.
Nyati S. Eitzmann M. Kappenman J. VanHouse D. Mohan N. Edris A. 《Power Delivery, IEEE Transactions on》1995,10(4):2013-2019
Power electronics have become increasingly reliable and cost effective at the transmission voltage level. New applications of FACTS devices are just emerging, the thyristor controlled phase-angle regulator (TCPAR) being one of them. This paper identifies and discusses several gate control and system issues for application of a single core transformer thyristor controlled phase-angle regulator. Alternative TCPAR designs are proposed 相似文献
9.
Volatile Organic Compound from Pulicaria gnaphalodes and the Antibacterial and Antifungal Properties of Its Essential Oil and Aqueous,Ethanolic and Methanolic Extracts
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10.
Edris PouresmaeilAuthor Vitae Oriol Gomis-BellmuntAuthor Vitae Daniel Montesinos-MiracleAuthor VitaeJoan Bergas-JanéAuthor Vitae 《Energy》2011,36(2):950-963
The paper deals with the multilevel converters control strategy for renewable energy resources integration in distribution grids. The proposed control scheme ensures the injection of the generated power in the distribution grid with fast dynamic response, while providing an additional active power filtering capability providing the required harmonic and reactive currents to the considered non-linear loads. The proposed control scheme is applicable to a general multilevel converter and to any types of the renewable energy resources. The control scheme is validated by means of simulations with a three-level diode-clamped converter which interfaces a wind power generation system to a distribution grid supplying non-linear loads. From extensive simulation results, high performance of this control strategy in renewable energy application is demonstrated with reduced total harmonic distortion, increased power factor and compensated load’s reactive powers. 相似文献