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The Ge0.89Sn0.11 photoconductors with interdigitated electrodes have been investigated. High responsivity of 28.5 A/W and spectral response cutoff at 3.0 μm were achieved. The D∗ of 4.5 × 1010 cm·Hz1/2W−1 is close to that of extended-InGaAs detector.
We present double heterostructure GeSn edge emitting laser. The structure was grown on a Si substrate using a commercial chemical vapor deposition with GeH4 and SnCl4. The lasing threshold of 68 KW/cm2 at 10K and maximum laser operating temperature of 110 K was achieved.
SiGeSn/GeSn/SiGeSn quantum well was grown on Ge buffered Si substrate via chemical vapor deposition. Photoluminescence spectra were obtained using three excitation lasers, which could in-depth probe the optical transition characteristics of the quantum well.
Cloud computing is attracting increasing attention since it enables clients with limited computing resources to perform and complete large-scale computations. However, it also comes up with some security and privacy concerns and challenges, such as the input and output privacy of the client, and cheating behaviors of the cloud. Motivated by these issues and focused on engineering optimization tasks,...
A design gauge pressure of an eco-friendly gas insulated switchgear (GIS) with an application of vacuum interrupters (VIs) ranges from 0.1 to 0.3MPa. Therefore, a high differential pressure is imposed on bellows of the VIs, which increases the fatigue failure risk of the bellows after cycles of operations. Although, there are some empirical equations recommended by the Chinese National Standard GB/T...
The paper utilizes a novel battery model based on the electrical features of LiFePO4 battery, because Kalman filter algorithm(KF) is largely dependent on system model. Measurements of battery state are easily disturbed by colored noise which is high relevance in working condition, and the paper studies that the system noise satisfy one-order AR model. The paper proposes an adaptive extended Kalman...
The controlled switching technology of a short circuit current has been proposed for a long time. However, the opening time of the mechanism used in the high voltage circuit breaker is normally tens of milliseconds and has a variation of milliseconds. The electromagnetic repulsion mechanism has a very limited variation in the opening time. It provides a potential of achieving the controlled switching...
The objective of this paper is to determinate the influence of grading capacitance on breakdown characteristics of a double-break vacuum interrupter. A prototype of double-break vacuum interrupter was built up as a U-type configuration with two 12 kV vacuum interrupters in series. The double-break vacuum interrupter is stressed by a power frequency withstand voltage and a lightning impulse withstand...
Many p-ary linear codes with two or three weights have recently been constructed from quadratic functions. In this paper, a construction of p-ary linear codes with two weights or three weights using a certain non-quadratic function is presented. In some cases, the resulted linear codes are optimal in the sense that they meet the Griesmer bound.
It is a hotspot in the field of remote sensing image analysis and application by using the macro and real-time features of the remote sensing image data for its change in Land and Resources. This paper introduces an automatic change monitoring method with remote sensing image data and historical interpretation vector data, which is based on the Gaussian Mixture Model and the vector-guided image spot...
This paper is concerned with a finite time control law design to suppress flutter in an alaeroelastic system. Firstly, we design a terminal sliding surface for the alaeroelastic system. Based on Lyapunov stability theory, the stability of the closed-loop system is established. The corresponding numerical simulations are demonstrated to verify the effectiveness of proposed method.
GeSn-based optically pumped lasers and photoconductors have been systematically investigated. The operation wavelength of these devices covers 2–3 μm. Since GeSn technique is fully compatible with current CMOS process, the GeSn-based devices can be widely used in the area of Si integrated photonics.
In order to solve the problem that traditional security system has some disadvantages such as low frequency, low efficiency, and high cost, this paper designs a UAV (Unmanned Aerial Vehicle) patrol system based on Bluetooth location. The system has subscriber terminal and UAV terminal. User sent the instruction from PC to the UAV by Zigbee network. The Xbee S3B chip accept the instruction and transfer...
In the mobile cloud environment, computation offloading provides a feasible solution for mobile intelligent devices to run those complex applications that require a large amount of computing resources. But most of the existing computation offloading algorithms are based on a single user's point of view and assume that the cloud resources are sufficient at any time. The scenario considered in this...
Differential evolution (DE) is a simple but powerful evolutionary algorithm, which has been widely and successfully used in various areas. In this paper, an event-triggered impulsive (ETI) control scheme is introduced to improve the performance of DE. Impulsive control (IPC), the concept of which derives from control theory, aims at regulating the states of a network by instantly adjusting the states...
A Ge0.95Sn0.05/Ge0.9Sn0.1/Ge0.95Sn0.05 single quantum well was grown on Si via chemical vapor deposition. Temperature-dependent Photoluminescence shows the emission peak from the GeSn well. The studied structure aims for group-IV based efficient light source on Si.
A double heterostructure Ge/Ge0.9Sn0.1/Ge photodiode detector grown on Si was systematically characterized. Temperature-dependent device performance has been investigated. A cutoff wavelength of 2.6 μm and the peak responsivity of 0.19 A/W at 300 K were achieved.
Characterizations of Ge/Ge0.9Sn0.1/Ge double heterostructure light-emitting diodes have been performed at the temperatures from 300 to 77K. The electroluminescence emission from the direct bandgap transition has been observed and systematically investigated.
One of the most salient features of smart city is to utilize big data to make our lives more convenient and more intelligent. This is usually achieved through solving a series of large-scale common and fundamental problems such as linear systems of equations, linear programs, etc. However, it is a very challenging task for resource-limited clients and small companies to solve such problems as the...
Online social media networks play important roles for people to share opinions, communicate with others. One of important features behind these activities is trust. This paper investigates the trust model in Online social media networks. Considering the interaction between two users and the reputation in the social networks, this trust model gives a definition about the trust value between two users...
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