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Significant enhancement in thermal diffusivity and thermal conductivity of graphene film, made from individual graphene oxide sheets, can be achieved upon modification with a small amount of Ag nanoparticles. It is readily rationalized in terms of not only the crosslink between the graphene sheets and Ag nanoparticles, but also the chemical intercalation of Ag nanoparticles into the gallery space...
Online marketing exploits social influence to trigger chain-like cascades. However, recent practices actively employ agents to collaboratively inflate the spreading of influences. Through supporting structures, they help each other with false feedback and signals to attract other users in the spreading process and thus alter the spontaneous social dynamics. In this paper, we proposed a modeling framework...
This paper investigates the Lithium-ion battery remaining useful life (RUL) prediction problem under grey model framework. The Lithium-ion battery capacity degradation is described with the help of grey model and revised grey model, respectively, and the least squares is employed to identify the unknown parameters in the grey models. Then the RUL prediction is presented based on the grey models. The...
The particle filtering (PF) algorithm is employed to predict Lithium-ion battery end-of-discharge time. The work voltage degradation model with six states is presented in the nonlinear state-space form, and the states such as model unknown parameters and work voltage are estimated by PF algorithm. Then the end-of-discharge time with probability distribution is further given by PF algorithm. The experimental...
In the paper, an evaluation structure was designed to investigate the degradation of gate metal in PHEMTs, and it can be used to separately appraise the resisted electromigration levels of the evaporated Ti/Pt/Au and the electroplated Au. The results show that the electromigration resistant level of electroplated Au of Ti/Pt/Au-Au is at least four times lower than that of the evaporated Ti/Pt/Au....
Prognostics and health management (PHM) can provide early warning of failures, reduce unscheduled maintenance events, extend time interval of maintenance cycle, and reduce the life cycle cost of LED lighting systems. In this paper, LED lamp (composed of a fixed number of LED strings and a driving system) is regarded as LED lighting system. This paper introduces different PHM approaches, including...
We have submitted the AlGaN/GaN High electron mobility transistors (HEMTs) to the high temperature reverse bias(HTRB) stress to assess their reliability for high voltage operations. The effects of HTRB stress as a function of the VDG and stress time on the DC parameters and trapping effects were investigated. The study was based on combined DC and pulsed characterization, transient measurement. It...
Temperature-dependent I-V characteristics are performed in this paper to investigate the trap states in AlGaN/GaN HEMTs. From temperature-dependent sub-threshold slope measurements conducted at 300K to 363K and 363K to 423K, two different trap densities are identified at AlGaN/GaN heterostructure interface with DitA and DitB of 1.08∼2.6×1012 eV•cm2 and 1.07∼1.44×1013 eV•cm−2 respectively. The trap...
Experimental evidences are presented showing the variety of supply voltage dependence of single event upset (SEU) sensitivity in diverse SRAM devices. Devices under test (DUTs) from Alliance Memory, ISSI and IDT companies with different technologies were irradiated by several kinds of heavy ions at Heavy ion Research Facility in Lanzhou (HIRFL) cyclotrons. For the Alliance 256 kb SRAM device, SEU...
Thermal effects in solid-state laser materials are a critical issue for designing diode-pumped solid-state lasers, the temperature distribution with different pump beam transverse profiles by using finite element method on 3–5μm solid-state laser are give in this paper. Based on the theoretical analysis, the thermal focal length of Tm: YAP crystal "b" direction and "c" direction...
The Lithium-ion battery capacity prediction error is analyzed by use of extended Kalman filtering(EKF) and curve fitting algorithms. This paper employs the capacity degradation model described by Colum efficient factor, rest time and other two unknown parameters. Then, a nonlinear state-space model is introduced, and the EKF is presented to estimate the capacity and the two unknown parameters. The...
In this paper, a high power laser diode electrical derivative parameters test instrument is developed, the wavelength range of this instrument is between 400nm to 1300nm, the power range of this instrument is between 1W to 15W. The relationships between the device reliability and the electrical derivative parameters are discussed. Then the measurements of 20 high power 808nm AlGaAs/GaAs laser diodes...
In general leading medicine, patients takes prescription to drugstore, then a pharmacist get this prescription, seeks gallipot on medicine cabinet. The pharmacist checks each drug, dose distribution, and gives it to patient. But there are lots of drugs and gallipots in large hospitals, the pharmacist must take more times on seeking and checking drug. In this processes, it takes lots of times on checking...
With the tendency of larger current flow and lower supplied voltage in the modern integrated circuits, the impedance profile of the power distribution network (PDN) should become lower and lower to maintain the power integrity. Selection and placement design of decoupling capacitor becomes critical to achieve a well-designed PDN. Extending single node analysis (SNA), a more efficient method is proposed...
Nanophotonics has raised a great attention because detection limit can easily go down to the molecular level. Herein, we present a dark-field integrated Light-eye Technology (iLeyeT) system for monitoring of polarization-dependent surface plasmons of single shaped nanomaterials. Single shaped gold nanomaterial such as gold nanorod present both longitudinal and transverse surface plasmonic resonance...
The Internet has become the most favorite environment for our students to connect with their peers. Many of them spent a significant amount of their daily time in “hanging out” with their friends in their preferred virtual platforms. This study aims at exploring the possibility of “stealing” the students' social time for learning purposes. A constructive learning environment (CLE) is designed for...
Many mobile applications rely on location information gained from location services on mobile devices. However, continuously tracking the device location with high accuracy drains the battery quickly. Furthermore, sensing the same location can be redundant when multiple devices are co-located. In this paper, we develop a crowdsourcing-based location service, E2A2 (energy efficient and accuracy aware),...
The practice of employing "the crowd" to help solve an organization's problems first became popular in the business sector, and has since spread to public and not-for-profit organizations. Input from the crowd can be solicited using different mechanisms involving various types of web-based applications, or the more recent trend of employing mobile phones with sensing capabilities. However,...
Inherent reliability of Surface acoustic wave filters plays a key role for its application in the mobile communication systems. Construction analysis is an effective method for evaluating the inherent reliability of electronic components. This work provides a construction analysis process for the surface acoustic wave filters, which includes external encapsulation analysis, internal encapsulation...
Prognostics and health management has become a preferred approach to achieve warning or respond to impending failure of electronic systems. A prognostic circuit for hot carrier injection (HCI) failure of integrated circuit was proposed in the paper, and it was simulated on the base of the SMIC 0.18 um mixed-signal CMOS process model. The prognostic circuit consists of stress voltage generation module,...
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