Phosphate solubilizing bacteria and their role in plant growth promotion

A review of stimuli-responsive shape memory polymer composites

http://ieeexplore.ieee.org/iel5/5/31047/01444179.pdf

Fundamentals of acoustics

Electrical discharge machining (EDM) is one of the earliest non-traditional machining processes. EDM process is based on thermoelectric energy between the work piece and an electrode. A pulse discharge occurs in a small gap between the work piece and the electrode and removes the unwanted material from the parent metal through melting and vaporising. The electrode and the work piece must have electrical conductivity in order to generate the spark. There are various types of products which can be produced using EDM such as dies and moulds. Parts of aerospace, automotive industry and surgical components can be finished by EDM. This paper reviews the research trends in EDM on ultrasonic vibration, dry EDM machining, EDM with powder additives, EDM in water and modeling technique in predicting EDM performances.

A review on current research trends in electrical discharge machining (EDM)

Phosphorus is an important plant nutrient which is in short supply in many agricultural soils Because much of the soluble phosphate (P) applied to soils as fertilizer is “fixed” by the soil and rendered less available to plants, the long-term application of P fertilizers has resulted in an accumulation of total soil P, most of which is poorly soluble Many soil fungi, predominantly of the genera Aspergillus and Penicillium , have been shown to possess the ability to solubilize sparingly soluble phosphates in vitro by secreting inorganic or organic acids Growth promotion and increased uptake of P by plants inoculated with P-solubilizing fungi have also been reported by many investigators

Growth Promotion of Plants Inoculated with Phosphate-Solubilizing Fungi

Underwater communications exists in many applications, providing information about the ocean floor such as bathymetry, for environmental pollution monitoring, information exchange between divers and sea vessel, and collection of scientific data. However, the propagation of sound in the sea is dependent on several environmental factors such as pressure which is related to depth, and some other ocean properties. The characteristic of sound propagation in the sea is determined by what is known as the sound speed profile. The speed of sound in the sea is determined and varies with depth, salinity change, temperature, the season as well as the geographic location. In general, different sea conditions has different characteristics of the sound speed profile. This project was aimed to determine the sound speed profile in Malaysian Seas. Parameters, which affect the sound speed profile, were studied, and their values determined.

Characterization of sound speed profile in Malaysian Sea off Tanjung Balau

Electrical Discharge Machining (EDM) is a process that uses electrical discharges to erode electrically conductive material where the electrode and workpiece do not touch Spark between electrode and workpiece in the EDM process produced magnetic fields The magnetic fields is found to have an effect on debris circulation in the gap of EDM, so it can decrease the abnormal electrical discharge An electric current has an effect on the magnetic field produced EDM uses the RC-generator configuration, so it is able to produce greater currents This paper presents the calculation current pulse generated by spark of EDM This calculation can be used to predict peak currents from EDM pulses Predict peak current is used to find out the maximum magnetic field and determine the maximum current rating of a component Pulse current calculation can use the equation that has been stated

Current Pulse Generated by Spark of Electrical Discharge Machining (EDM)

Amplitude comparison is the simplest method of Radio Direction Finding (RDF) which utilise several directional antennas and compare the signal strength from each antenna to calculate the Angle of Arrival (AoA). There is some jargons mention that more antennas used in amplitude comparison RDF will improve the RDF accuracy. However, a further analysis and real test is still required to support this argument. Therefore, this paper will verify this specific problem by develop 6 antenna RDF system and 4 antenna RDF system then analyse the real test data. A type of printed circuit board log-periodic dipole array (PCB LPDA) antenna is utilised in this paper for the experiment setup. The real test setup and the data collection is explained in this paper to discuss and verify this argument. After the discussion, it is verified that amplitude comparison with 4 antennas has better accuracy than the similar system with 6 antennas.

Accuracy Comparison of Radio Direction Finder with 6 and 4 of Log Periodic Dipole Array Antennas

This paper presents a current mode Pulse Width Modulation (PWM) controlled Flyback converter using UC3842 for Electrical Discharge Machining current generator control circuit. Circuit simplicity and high efficiency can be achieved by a Flyback converter with current mode PWM controller. The behaviors of the system's operation is analyzed and discussed by varying the load resistance. Matlab software is used to simulate the Flyback converter where a prototype has been built and tested to verify it's performance.

Electrical Discharge Machining Flyback Converter using UC3842 Current Mode PWM Controller

In the previous paper, a readout approach for the Hamiltonian path problem (HPP) in DNA computing based on the real-time polymerase chain reaction (PCR) was proposed. Based on this approach, real-time amplification was performed with the TaqMan probes and the TaqMan detection mechanism was exploited for the design and development of the readout approach. The readout approach consists of two steps: real-time amplification in vitro using TaqMan-based real-time PCR, followed by information processing in silico to assess the results of real-time amplification, which in turn, enables extraction of the Hamiltonian path. However, the previous method used manual classification of two different output reactions of real-time PCR. In this paper, alternative fuzzy c-means (AFCM) clustering algorithm is used to identify automatically two different reactions in realtime PCR. We show that AFCM clustering technique can be implemented for clustering output results of DNA computing readout method based on DNA Engine Opticon 2 system.

Azli Yahya

Papers

Characterization of sound speed profile in Malaysian Sea off Tanjung Balau

Current Pulse Generated by Spark of Electrical Discharge Machining (EDM)

Accuracy Comparison of Radio Direction Finder with 6 and 4 of Log Periodic Dipole Array Antennas

Electrical Discharge Machining Flyback Converter using UC3842 Current Mode PWM Controller

Alternative Fuzzy C-Means Clustering for DNA Computing Readout Method Implemented on DNA Engine Opticon 2 System