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One way to excite a dark envelope soliton is to use a dark input pulse — a narrow dip in the amplitude of a continuous wave background. This approach has been used previously to excite dark solitons for surface spin waves in yttrium iron garnet (YIG) thin film strips1 and for lasers in photorefractive crystals.2 Theoretically, however, an initial dark signal should not evolve into a single dark soliton,...
Due to excellent magnetic properties, sintered Nd-Fe-B magnets have been used in various fields for many years [1, 2]. However, Nd-Fe-B magnets show a relatively low temperature stability of performance which is a main disadvantage for the application in some special cases. In order to improve the temperature stability of performance, Co, Dy and Tb elements have been added to the Nd-Fe-B sintered...
Virtual air gap controlled reactor (VGR) is an electrical device based on the working principle of the saturation in the iron cores [1]. The magnetic permeability of the iron cores in the VGR can be changed smoothly by regulating the direct current in the exciting windings. The higher the magnetic permeability of the iron cores, the greater the inductance of the VGR is, and vice versa. Since the advantage...
The fault detection problems of multirate-output sampled-data (MROSD) systems and MROSD systems with time delays are investigated. The main advantage of the approaches presented in this paper is that they can take into consideration the intersample behavior of such systems. The basic idea is to observe the dynamics of the system at fast sampling instants and then downsample the discrete-time outputs...
Memristors are labelled as a significant candidate of building a better storage structure, higher capacity and more efficient performance. Research shows that the density of a memristor array could be 100 times higher compared to the dynamic random-access memory, hence it is possible to build a storage structure with high density. Tracing back to the year 1971, Prof. Chua firstly proposed the memristor...
The memristor is an emerging device in nanotech-nology, which provides nanoscale size, low power consumption and high density. It has been widely used in neural networks where memristors are utilised as synaptic weights (connection sites) between neurons. In particular, current research focuses on the spiking-time dependant plasticity (STDP) which is an important synaptic modification rule based on...
Memristor is an emerging topic that has experienced a great development in the last few years. The concept of memristor was introduced as the fourth fundamental circuit element by Prof. Chua in the year 1971. A memristor could be one kind of electronic devices of novel nano-scale structures, which could be used in many applications, such as associative memories and neural networks. Among the emerging...
Within the last years the multiple-input multiple-output (MIMO) technology has revolutionized the optical fiber community. Theoretically, the concept of MIMO is well understood and shows some similarities to wireless MIMO systems. The interference in broadband MIMO systems can be removed by applying a spatio-temporal vector coding (STVC) channel description and using singular value decomposition (SVD)...
In an islanded microgrid, the reactive power needed to support the voltage regulation could not be shared among distributed generators (DGs) accurately when those conventional droop control scheme is imposed, due to the effects of mismatched feeder impedance of DGs parallel operation. Meanwhile, the conventional droop control scheme can not achieve satisfied voltage recovery performance at the point...
Unstable equilibrium point (UEP) and dynamic saddle point (DSP) are completely different concepts in the power system transient stability analysis. However, some research still hold the view that UEP accurately reflects the power system transient stability and try to define and find the so-called related UEP. In this paper, the differences and correlations between UEP and DSP in reflecting system...
To solve the problem of inaccuracy and bad anti-noise performance in traditional methods on precession period estimation, a novel approach is suggested. The approach is based on the exploiting average magnitude difference function (AMDF) and autocorrelation function (ACF). No a priori information about ballistic target under classification is required for estimation of period. The trend term of AMDF...
High penetration of wind power with the characteristics of randomness and fluctuation will affect grid frequency stability, especially in an isolated power system. Taking an isolated industrial power system which is a recycling economy demonstration project owned by China Power Investment Corporation as the studied system, the frequency response characteristic of power system with demand side contribution...
SyntheticAperture Radar (SAR) has the ability to work inevery hour, under all weather conditions. The multichannel SAR well solved the dilemma between the swath-coverage and the azimuth resolution. However in reality, the phase equalization of each sub-channel is influenced by many unideal factors, which can degrade the imagequality. In this paper, firstly the main factors are summarized and their...
Optical interconnects require efficient and flexible optical sources. This paper presents results on two technology platforms being developed for realizing these. Integration using wafer bonding technologies is well established now and the focus is on new device types including tunable lasers, multi-wavelength lasers and switching. As an alternative, we also started work on monolithic integration...
Memristor is a newly emerged device in nano-technology that provides low power consumption as well as high density. In this paper, the staircase memristor which has multiple stable resistive states is modelled and exploited, and its possible applications are investigated. Comparing with the analog memristor model proposed by HP, the staircase memristor model shows a significant delayed-switching effect...
To research nitrile rubber O-rings' lifetime with less time and resources, and to reach a more convincing and statistic result, an accelerated degradation testing (ADT) is designed, which consists of a 90C pre-test and a step-stress test with 70 °C, 80 °C, 90 °C and 100 "C. Compression sets obtained from ADT are analyzed as degradation data, and degradation models were fitted to data using Bayesian...
With the advantages of small size and low cost RSSI-based ranging and positioning technology is suitable for the large-scale applications or indoor environments. Whereas multipath structure of indoor radio channel caused by complex indoor environment, as well as the far field conditions of antennas are not feasible due to the short propagation distance, have a strong impact on indoor positioning accuracy...
The paper presents a spatial pooling technique for image quality assessment (IQA) that is based on the idea that the adaptive mechanisms of luminance and contrast in the early vision operate independently. The work is motivated by recent vision science studies on this topic that have not been investigated yet in the field of IQA. The Structural SIMilarity index (SSIM) has been selected as the base...
Computer science has impact on many parts of our lives. Computer scientists craft the technologies that enable the digital devices we use every day and computing will be at the heart of future revolutions in business, science, and society. Our research targets the next generation computing paradigms and their applications. We have been working on Cloud Computing, Grid Computing & Internet II for...
Computer science has impact on many parts of our lives. Computer scientists craft the technologies that enable the digital devices we use every day and computing will be at the heart of future revolutions in business, science, and society. Our research targets the next generation computing paradigms and their applications. We have been working on Cloud Computing, Grid Computing & Internet II for...
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