Effects of tides on the hydrology and geometry of a freshwater channel

The situation of Sungai Sengkuang becomes worse because it is under tidal influence. Flood was reduced after removing the temporary culvert. Analysis is carried out for the existing system to investigate whether it is still able to accommodate the volume of water comprises the discharge from upstream and high tide from downstream. The computer program such as HEC-HMS 2.2.2 will be used to carry out the Hydrologic Model Calibration. By using HEC-RAS, Hydraulic Model Calibration will be carried out for the channel. The discharge with different ARI will be used as the upstream boundary condition during the flow analysis. Frequency analysis for the tide level which is collected from JUPEM. The tide level with different ARI is used as the downstream boundary condition. From the Energy Grade Line of the channel, which energy is dominant, the energy from downstream or the energy from upstream.Keywords: tidal influence; dominant energy; flow analysis; hydraulic and hydrology model analysi

Nutritional supplement intake knowledge among university active graduates

The purpose of this study is to examine the nutritional supplement intake knowledge among university athletes. Fifty-one university athletes volunteered to participate in this survey study. Results showed the nutritional supplement intake was significantly higher compared to the knowledge that they have about the supplements. Besides that, the performance was significantly greater compared to the supplement intake. To conclude, it is important for the coaches to educate their athletes on the importance and risks of nutritional supplements in order to ensure great performance achieved besides reducing the risks of getting the negative effects of supplements.Keywords: supplement, health, sports, training, knowledg

Passively mode-locked laser using an entirely centred erbium-doped fiber

This paper describes the setup and experimental results for an entirely centred erbium-doped fiber laser with passively mode-locked output. The gain medium of the ring laser cavity configuration comprises a 3 m length of two-core optical fiber, wherein an undoped outer core region of 9.38 μm diameter surrounds a 4.00 μm diameter central core region doped with erbium ions at 400 ppm concentration. The generated stable soliton mode-locking output has a central wavelength of 1533 nm and pulses that yield an average output power of 0.33 mW with a pulse energy of 31.8 pJ. The pulse duration is 0.7 ps and the measured output repetition rate of 10.37 MHz corresponds to a 96.4 ns pulse spacing in the pulse train

The comparison of dual wavelength fiber laser spectrum in SMF and HNLF by utilizing laser diode

A dual-wavelength erbium-doped fiber (EDF) fiber ring laser in single mode fiber and highly nonlinear fiber is demonstrated and both optical spectrums are compared at 400 mA of Laser Diode (LD) output. The fiber ring laser cavity incorporated sagnac loop had been applied for the laser to lase two wavelengths simultaneously due to high birefringent in polarizaton-maintaining fiber (PMF). Experimental results show that, owing to the contributions of two degenerate fourwave mixings (FWM) in the HNLF and the dual-wavelength proposed fiber laser is quite stable with small fluctuation power in 1.93 dB within 24 minutes in HNLF

Anger mood detection based on face recognition and heartbeat

Anger is one of the feeling that showing strong resentment that can be found in facial expressions, body language, physiological responses and at times in public acts of aggression. So, this project has designed to examine the existence of the individual nature of anger using facial expression and heartbeat. The objective of this project is to warn and help people to control their temper. This can prevent the bad effect towards heart rate, blood pressure, levels of adrenaline and noradrenalin and other physical effects. Matlab-Image-processing is used to analyze facial expressions while heartbeat is measured using a heartbeat detector circuit. The Graphic User Interface (GUI) indicates the angry face result while the Liquid Crystal Display states the faster heartbeat when a person is angry

Characteristics of Mineral Oil-based Nanofluids for Power Transformer Application

Trends in the field of nanomaterial-based transformer oil show most of the conducted works have focused only on the transformer oil-based nanofluids but limited studies on the stability of transformer oil-based nanofluids. Since mineral oil-based nanofluids still can produce the sedimentation, thus the cold-atmospheric pressure plasma method is proposed to functionally modify the Silicon Dioxide (SiO2) nanofiller in order to enhance the electrical properties of the mineral oil-based nanofluids. The AC breakdown strength oil samples before and after modification were measured. It was found that the plasma treated nanofluids have higher AC breakdown voltage compared to pure oil and untreated nanofluids. Also, Fourier Transform Infrared (FTIR) Spectroscopy has been used in this study to analyse the physical changes of oil samples. It is envisaged that the added silica nanofiller has significant effect on electrical properties of the transformer oil-based nanofluids which would enable to the development of an improved class of liquid dielectric for the application of power transformer

A Pattern-Based Password Authentication Scheme for Minimizing Shoulder Surfing Attack

The user usually uses password to avoid the attacks like a dictionary attack, brute force attack and shoulder surfing attack which is the famous attack nowadays. The shoulder surfing attack is a direct observation technique by watching over the user’s shoulder when they enter their password to get information. The most common authentication method used by the user is textual password. But, the textual password has many disadvantages because it is vulnerable to attack as it tends to shoulder surfing attack. In this project, a pattern-based password authentication will develop to overcome this problem. Using this scheme, the user needs to select the type of pattern that they like during registration. To login to their account, the user needs to enter the password in the form of the textual password in ordering manner based on a pattern that they choose during registration. The text password grid presented with a different style as it filled with random objects whether characters, numbers or images. This method is suitable to minimizing shoulder surfing attack as it can improve the security of user’s password and they can efficiently login to the system

Effect of tetraoctylphosphonium bromide (TOPBR) clay composition on polyvinylidene fluoride (PVDF) nanocomposite ultrafiltration membrane

Nanocomposite membranes containing polyvinylidene fluoride (PVDF) and tetraoctylphosphonium bromide clay (TOPBr) were prepared by phase inversion method. Different TOPBr and PVDF contents were used in order to investigate the effect of TOPBr clay composition on the membrane properties. The morphology of PVDF/TOPBr nanocomposite ultrafiltration (UF) membrane was characterized by scanning electron microscopy (SEM) and hydrophilicity of the nanocomposite membrane was evaluated in terms of water content, porosity and pure water flux (PWF). The results revealed that the increasing of TOPBr clay content produced more porous nanocomposite membrane due to the formation of many finger like pores and microvoids. The hydrophilicity of the membranes was strongly enhanced by increasing the contents of TOPBr clay.Keywords: Polyvinylidene fluoride; Nanocomposite membrane; Ultrafiltration; Hydrophilicity; Cla

Realization of Circular Slot Frequency Selective Surfaces using Photoplotter and Wet Etching Technique for Terahertz Material Sensing Applications

This paper discusses on the analysis of band pass Frequency Selective Surfaces (FSS) for performance enhancement in material sensing application. Terahertz Spectroscopy has proved to be versatile tool for detection and sensing in measuring non-conductive materials. It is because most of the non-conductive materials have unique molecular resonance that may translate as transmission and absorption of signals within terahertz range. However, the most critical issue in detection and sensing is to improve its sensitivity therefore an extremely low concentration material still can be able to be detected in THz band. Hence, in this paper, a circular slot is modeled on a planar structure of Rogers Duroid 5880LZ substrate with thickness of 508µm using Computer Simulation Technology (CST). The simulation generates a band pass response with transmission magnitude of 0.95 at 0.66THz. Furthermore, photoplotter and wet etching fabrication process is used for the realization of terahertz FSS. Simulated and measured transmission shows a good agreement between 0.5THz to 0.7THz as only 1% shifts in frequency between simulated and measured results. Besides that, the fabrication of circular FSS shows narrower measured bandwidth as compared to its simulated counterpart. Hence, with the limitation of the wet etching to produce micron size structure both simulation and measured result shows good agreement for all the critical issues in this study