Classical Dynamics of Particles and Systems

The growth and survival of Penaeus vannamei postlarvae was measured at temperatures of 20, 25, 30 and 35 °C and salinities of 20, 30, 35, 40 and 50%.. Groups of 30 animals were used in each combination of conditions, in triplicate. The results clearly show that juveniles of this species have their best survival between temperatures of 20 and 30 °C and salinities above 20%.. Best growth was obtained between temperatures of 25 and 35 °C, with little difference being noted among salinities. Survival and growth coincide best at around 28 to 30 °C and 33 to 40%.. Calculated overall production was shown to be best in these conditions. The results demonstrate a high coincidence between the experimentally determined optimum conditions for production and the prevailing conditions in the coastal environment from which the animals originated.

The effects of salinity and temperature on the growth and survival rates of juvenile white shrimp, Penaeus vannamei, Boone, 1931

Application of robotics in offshore oil and gas industry- A review Part II

Computer Vision Technology for Food Quality Evaluation

Visual quality detection of aquatic products using machine vision.

This paper presents the Pulse Induction Metal Detector Using Sample and Hold Method. The proposed method is to measure output voltage from search coil. The system consists of the pulse generator circuit, amplifier circuit, integrator circuit, three mono-stable circuits, sample and hold circuit, comparator circuit and display circuit. The voltage output signal of the proposed technique is proportional to size, shape and type of metal target. The metal target with differential size was used in our experiment as an illustrative case study. Experimental results show that the proposed method can detect metal with satisfied sensitivity and good linearity.

Pulse Induction Metal Detector Using Sample and Hold Method

In this paper, a JK-flip-flop-based logic circuit is described. Using two output signals of this designed logic circuit to control a buffered peak detector followed by a simple sample-and-hold circuit in sequential operation, a sinusoidal amplitude detector is proposed. The proposed detector allows the frequency of input signals to be varied over a wide range. Experimental results verifying the performances of the proposed circuit are in close agreement with the expected values.

An Amplitude Detector for Variable Frequency Sinusoidal Signals

This paper proposes a design and implementation of wireless temperature monitoring system for shrimp farm based on ZigBee technology. The proposed system consists of three wire resistance temperature device (RTD) type PT-100, Current source circuit, XBee Pro module, 2.4 GHz antenna with gain 5dBi, Arduino Uno R3 microcontroller board and LabVIEW program for monitoring and control system. Experimental results with standard temperature bath show that the proposed system can monitor temperature with satisfied data. The maximum error of temperature is about 0.25 percents. The maximum range of system is about 500 meters.

ZigBee based wireless temperature monitoring system for shrimp farm

A new technique for realizing the resolver-to-DC converter using the OTA-based inverse-sine function circuit is presented. The proposed converter comprises the demodulator, absolute detector, minimum detector, plusmn unity-gain amplifier, controlled signal logic circuit, and OTA-based inverse-sine function circuit. The output voltage is linearly proportional to the resolver angle with maximum absolute error of about 0.195%, which is less than the error from the conventional resolver-to-DC converter based on the similar OTA-based inverse-sine function circuit. PSPICE simulation and experimental results verifying the performances of the proposed circuit are in close agreement with the expected values.

A novel resolver-to-DC converter based on OTA-based inverse-sine function circuit

This paper presents a simple method based on sinusoidal-amplitude detector for realizing the resolver-signal demodulator. The proposed demodulator consists of two full-wave rectifiers, two ±unity-gain amplifiers, and two sinusoidal-amplitude detectors with control switches. Two output voltages are proportional to sine and cosine envelopes of resolver-shaft angle without low-pass filter. Experimental results demonstrating characteristic of the proposed circuit are included.

http://ieeexplore.ieee.org/iel5/5656240/5669634/05670163.pdf

Anucha Kaewpoonsuk

Papers

Pulse Induction Metal Detector Using Sample and Hold Method

An Amplitude Detector for Variable Frequency Sinusoidal Signals

ZigBee based wireless temperature monitoring system for shrimp farm

A novel resolver-to-DC converter based on OTA-based inverse-sine function circuit

A simple amplitude detector-based demodulator for resolver converters