The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The extensive exploitation of sea ice often results in increase and accumulation of salinity in the seawater around the exploiting spot. Based on the ECOMSED model, this paper builds up a salinity diffusion model which is driven by three dynamical situations in order to quantitatively analyze the transfer and diffusion situation of salinity which is enhanced during ice period in the Bohai Sea. Results...
An XUV continuum supporting 280 as isolated attosecond pulses is generated in argon with a 200 mJ, 17 fs Ti:Sapphire laser using the GDOG technique. The energy of the XUV pulse is over 100 nJ at generation location.
Isolated attosecond pulses with continuum spectra extending below 15 eV are used to probe the sub-cycle energy shifts and splitting of helium excited states. Additionally, new absorption features appear far from the 1snp absorption lines.
Tumor clustering from bio-molecular data provides a new way to perform cancer class discovery. In this paper, we propose a hybrid fuzzy cluster ensemble framework (HFCEF) for tumor clustering from cancer gene expression data. Compared with traditional cluster ensemble framework, HFCEF integrates both the hard clustering and the soft clustering into the cluster ensemble framework. Specifically, HFCEF...
Acoustic emission (AE) sensors are used to detect acoustic signals from serious and active defects of vessels inspected. Ordinary AE sensors generally can not be directly coupled on walls of high/low-temperature or complicated vessels because of the limitations of their temperatures or configurations. In this paper, several practical and improved wave-guide rods are designed so as to test these special...
Providing physical-layer security for future wireless networks draws increasing attention. In this paper, we consider OFDMA networks which can fully guarantee the confidential message transmission for each user. We present a malicious and active eavesdropper, which is registered in the OFDMA network and reports a false channel state information (CSI) to the base station (BS) in order to obtain chance...
Facial expression recognition is one of challenging topic in image processing. In this paper, a new feature extraction algorithm is proposed for facial expression recognition, in which Gabor filter is combined with 2D complexity for feature extraction. In order to obtain information of texture of expression in a static gray image, the image is transformed to sub images by Gabor wavelet after considerable...
Spike timing dependent plasticity (STDP) learning rule is one of hot topics in neurobiology since it's been widely believed that synaptic plasticity mainly contribute to learning and memory in brain. Up to now, STDP has been observed in a wide variety of areas of brain, hippocampus, cortex and so on. Competition among synapses is an important behavior for this learning rule. In present study, we propose...
Single isolated attosecond pulse is a new powerful tool for studying dynamics of correlated electron motion in pump-probe experiments [1]. Such pulses, as short as 67 attoseconds, can now be generated with the Double Optical Gating (DOG) method. The broadband XUV supercontinuum spectrum of the isolated attosecond pulse is particularly suitable for probing the time variation of the electronic states...
We firstly study terahertz time-domain spectroscopy (THz-TDS) characterization of two kinds of pesticides 1-naphthaleneacetic acid and 4-chlorophenoxyacetic acid. The absorption spectrum and refractive index of samples were measured. Theoretical investigation of the vibrational spectrum of pesticides was performed based on density function theory (DFT). We observed that experiment spectra are in rough...
Reconstruction of Stress Corrosion Cracks (SCCs) using conventional Eddy Current Testing method (ECT) shows its limitation especially when dealing with deep SCCs. Recently, a new approach utilizing Pulsed Eddy Current Testing (PECT) signals has been proposed to reconstruct wall thinning defect based on a deterministic optimization method. It is because PECT is found advantageous over the conventional...
A novel fault section location method based on characteristic frequency sequence determined by multiple combinations for distribution network is proposed. This method S-tranforms the transient zero-mode current components of every detection point on a whole line, and selects the characteristic frequency sequence based on the corresponding frequency point of its maximum transient energy. On the above...
Abstract-The line loss of power system is an important economic indicator in the operation of power system.The analysis method of line loss for planning grid is developed. The data of system are taken from EMS. After getting data from EMS, state estimation will be carried out periodically. The feature program is that it can analyze the line loss for planning grid in the corresponding period.The program...
The current LCA research mainly focuses on evaluation model. And it is difficult to relate the results of assessment with the conceptual design information and support the concept optimization effectively from design level. A RLCA model with backtracking mechanism based on green feature is proposed in this paper, and the backtracking mechanism of the model is illustrated in detail. Firstly, the impact...
The current methods of life cycle assessment mainly focus on the impacts evaluation of existing products and detailed design of products, and there is a lack of direct guidance to the green design process. In this paper, a new life cycle design method based on green features is proposed for mechanical and electrical products. Firstly, the concept of green feature is proposed to describe information...
Generalized Double Optical Gating is an effective scheme for generating single isolated attosecond pulses with multi-cycle driving lasers. It is to be implemented using a >100 mJ Ti:Sapphire laser to upscale the attosecond photon flux.
Recently micro-energetic devices by integrating the energetic materials into micro-electromechanical systems (MEMS) to meet the requirements of energy and function diversity have attracted attention from many researchers. Here the technology of modified electrochemical corrosion which is fully compatible with standard microelectronic manufacturing is reported and used to prepare the porous silicon...
Groundwater management is a new challenge for most developing countries. A case study of Shanghai groundwater management history is put forward to provide experiences for other countries. The paper classified Shanghai groundwater exploitation history (since 1961) into 5 phases, considering the over exploitation in different aquifers and consequently land subsidence in different times. Measures, carried...
This paper reports a new kind of extrusion roller embossing microstructure process, which enables the fabrication of diffusers with surface microstructures. Established extrusion roller embossing system consists of polymer plate extrusion institution and roller embossing agency. The metal roller microstructure roller for embossing is fabricated by coating the slab mould. During the roller embossing...
Providing physical-layer security for mobile users in future broadband wireless networks is of both theoretical and practical importance. In this paper, we formulate an analytical framework for resource allocation in a downlink OFDMA-based broadband network with coexistence of secure users (SU) and normal users (NU). The problem is formulated as joint power and subcarrier allocation with the objective...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.