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Photo-Fenton reaction is a kind of advanced oxidation technology based on the reaction of hydroxyl radical. In order to further enhance the photocatalytic efficiency, with citric acid as the catalytic additive, and malachite green as the substrate, experiments on the photocatalytic oxidation of organic pollutants in UV/Fenton/Citric acid system were carried out. Effect of Fe(II) concentration, initial...
This study develops a novel IEEE 802.21 MIH (Media Independent Handover) mechanism for next generation vehicular multimedia network. An adaptive QoS management mechanism is also proposed. By obtaining received signal strength parameters, the proposed MIH framework can determine the best available network. The adaptive QoS mechanism substantially improves the performance of real-time multimedia applications...
The design, fabrication and characterization of an electrostatic-type bi-axial MEMS scanning mirror operating with inter-digitated comb fingers are presented. The effect of comb offset on device actuation is examined. In addition to standard designs with and without comb offset, a novel asymmetric mirror plate was designed to introduce an imbalance. It was found that all the three designs can be actuated...
An accurate and effective finite element method (FEM) based model for the MEMS electrostatically actuated 2D resonant scanning mirror is presently reported to analyze and predict the mirror's performance which has highly nonlinearity. The simulated transient responses of the mirror showed good matches with the experimental results. The hysteretic frequency response can also be predicted by the model...
Routing protocols for wireless sensor networks can be divided into proactive, reactive and hybrid routing. Each routing protocol has its advantages and disadvantages. A service is force-terminated when the working routing protocol can no longer support all sensor network operations. This work describes an adaptive routing protocol based on the redundancy node and the dual routing protocol. By using...
Branch modeling is one of the most important aspects in plant modeling, as branches build the structure of a plant. In this paper, we present a new method for branch modeling from two or four registered images using particle flows. Several strokes are drawn to represent branches on each image and the system produces a 3D branch model automatically. A trace analysis approach is proposed to establish...
China has already become world's largest coal producer and consumer. China's production in 2006 roughly equaled the combined production of the next four top producers (the United States, India, Australia and Russia). The dynamic GM(1,1) model of grey theory is used to forecast the coal production and consumption in China. In order to improve the forecast accuracy, the original GM(1, 1) models are...
In the numerically controlled manufacturing process of the spring, there are some problems such as lower automation and inconvenient operation. In view of this situation, the paper presents the approach of digital manufacturing for spring. The composition and the key technology of the digital manufacturing system are revealed, and an example is given to illustrate the system application. The digital...
This paper introduces a new current-mode biquadratic filter with three input terminals and one output terminal. The circuit uses one minus-type second-generation current controlled conveyor (CCCII-),one multi-output second-generation current controlled conveyor (MOCCCII), two plus-type second-generation current conveyors (CCII+), four grounded capacitors and two grounded resistors. The proposed circuit...
In the field of ultrasonic non-destructive testing, often encounter the problem of noise. In the detection process, the ultrasonic transmission medium are uneven, and the detection of different objects, the content and composition of impurities are not the same, even though vary greatly, which will lead to high-frequency signal and noise signal superimposed together to reduce the detection the accuracy...
Social security system which is a necessary means to retain social stability and economic development is an important sign of modern nations and society with civilization. Firstly, this paper analyses the relations among the sub indexes of development level for social security systems. Secondly, it sets up differential equations model to quantitatively analyze the relations among the sub indexes based...
Cognitive radio (CR) is one of the most effective techniques to improve the spectrum utilization efficiency. In order to detect the presence of the spectrum holes and utilize them efficiently without causing interference to primary users, interference temperature estimation is considered as the key functionality. In this paper, we proposed a new interference temperature estimation method in OFDM based...
This article tests the information flow between Share A and share H adopting the common actor contribution method, which belongs to the price-discovery theory. We discover that in bear market information flow is lower relative to that in bull market. In bear market, information flow between closing price of share A and share H is largely the same as that of closing price of share H and opening price...
Quickly acquiring the data required from network node environments to share files in the vast P2P network environment is a challenging job. Many researches have proposed data sharing mechanisms and scheduling methods in P2P environments, however, most focused on the efficient utilization of network bandwidth, using greedy methods to deliver the data to the client end as early as possible. However,...
Sharing of frequency spectrum between licensed primary users and unlicensed secondary users (SUs) requires reliable detection of spectrum occupancy by the SUs. We present a a new cooperative spectrum sensing in OFDM system based on MIMO cognitive radio (CR) sensor networks. We present a new interference temperature estimation approach based on OFDM technique in MIMO system. Frequency spectrum sensing...
The main purpose of this paper is to predict stream-way transition with adaptive-network-based fuzzy inference system (ANFIS). Therefore, the downstream stream-way transition according to the upstream conditions is forecasted by ANFIS. Five main factors may affect the stream-way transition include inflow position, inflow angle, slope, flow discharge, and sand content of suspended sediment. We selected...
RFID middleware often has to process enormous amounts of data, possibly causing overloading and leading to data errors. Therefore, RFID middleware applications require load-balancing mechanisms. This work proposes a grid-based load-balancing mechanism for RFID middleware applications. The proposed mechanism incorporates functional modules buffer management and load balancing management over a grid...
A new method for evaluating roundness error using polar measurement data, which named as polar mesh searching algorithm (PMSA), has been presented in this paper. The principle of the algorithm was that series of polar-coordinate mesh points were collocated around the periphery of the least square circle according to certain rule, the radius of all the measured points were calculated by regarding each...
In this paper, we consider cooperative spectrum sensing in OFDM based on energy detection in MIMO cognitive radio sensor networks. Soft combination of the observed energy values from different cognitive radio users is investigated. Square-law-combining (SLC) is theoretically proved to be nearly optimal in low signal-to-noise ratio (SNR) region, an usual scenario in the context of MIMO cognitive radio...
Calcined layered double hydroxides particles were used as adsorbent to remove fluoride ions. Batch adsorption studies were conducted under various equilibrating conditions. The results show that the HTlc calcined at 500??C had the highest capacity of removal of fluoride ions, after adsorption it regenerated to its original layered structure, it is called "memory effect". In field water studies,...
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