Hazry Desa
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Preferred name
Hazry Desa
Official Name
Desa, Hazry
Alternative Name
Desa, H.
Hazry, Desa
Desa, Hazy
Hazry, D.
Main Affiliation
Scopus Author ID
16642497100

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Effects of sodium hydroxide treatment on date seeds reinforced LLDPE composites: FTIR and gel content analyses

2020-03-25 , Elnaid A. , Nik Noriman Zulkepli , Omar S. Dahham , Azizan M.A. , Hazry Desa , Dahham S.S. , Umar M.U.

The biocomposites from linear low-density polyethylene (LLDPE) and date seeds (DS) were successfully synthesized using extrusion and injuction molding process respectively. The effects of different Sodium Hydroxide (NaOH) concentration (3, 6, and 9 wt.%) on the structural properties of LLDPE/DS composites were invistigated using FTIR and Gel Content test. Results showed that a decrease on the absorption band at 3346 - 3347 cm-1 of treated samples as compared with untreated sample due to the removal of the hemicellulose component from the treated samples. Furthermore, the peak at 1050 cm-1 has slightly reduced as the NaOH added. The gel content of the treated samples have slightly increased as compared with LLDPE control, which means the number of crosslinks between LLDPE and DS increased in presence of NaOH. Furthermore, The treated sample with 6 wt.% NaOH showed relatively higher gel content compared to untreated sample and other treated samples.

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Effect of Spraying Dispersion Using UAV Spraying System with Different Height at Paddy Field

2023-01-01 , Hazry Desa , Muhammad Azizi Azizan , Nik Noriman Zulkepli , Nurfadzillah Ishak , Hang T.X. , Yahya S.S. , Shahrazel A.A.M. , Mansor F.M. , Aziz S.Z.A. , Hussain A.S.T.

This study investigated the UAV spraying system height in relation to spraying uniformity and dispersion. The operating heights of the UAV spraying system at heights of 1 m, 1.5 m, and 2 m from the hollow cone nozzles were investigated within a wind speed of 2.8 m/s. The tests were to determine the spray uniformity and dispersion on the water sensitive paper that was placed on the paddy plant. The results of water droplet samples were evaluated using ImageJ software. The results show the droplet distribution at 1.5 m height has high values for average droplet density, which is 162.7 deposits/cm²at the top area and 161.8 deposits/cm²at the bottom area. The percentage of coverage was also high, at 55.21% at the top area and 51.4% at the bottom area.

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The influence of alkali treatment on date seeds powder reinforced LLDPE composites: Flexural properties and impact strength

2020-03-25 , Elnaid A. , Nik Noriman Zulkepli , Dahham O.S. , Rosniza Hamzah , Muhammad Azizi Azizan , Hazry Desa , Umar M.U.

In this work, the influences of different concentration of sodium hydroxide (NaOH) (3, 6 and 9 wt.%) on the flexural and impact properties of linear low-density polyethylene / date seeds (LLDPE/DS) composites were examined. The LLDPE / DS ratio was fixed at 90/10 wt.% and the size of DS particles was measured at 125 - 250 micro m. The process used to synthesize the composites id extrusion followed by injuction molding process. Results showed that the presence of NaOH particularly at 6 wt.% concentration has improved the flexural and impact properties of the composite. This is due to bonding of the date seeds particles with the LLDPE matrix that reflected posativelly on the mechanical properties of the composite. However, the using of high NaOH concentration (9 wt.%) has shown an opposite trend, the increasing of surface roughness of the fiber after 9% NaOH treatment has reduced the flexibility of the composite and made it stiffer and more rigid, which in turn made it easy to break during mechanical test.

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Definite time over-current protection on transmission line using MATLAB/Simulink

2024-04-01 , Taha T.A. , Zaynal H.I. , Hussain A.S.T. , Hazry Desa , Taha F.H.

This paper has investigated the application of the definite time over-current (DTOC) which reacts to protect the breaker from damage during the occurrence of over-current in the transmission lines. After a distance relay, this kind of over-current relay is utilized as backup protection. The over-current relay will provide a signal after a predetermined amount of time delay, and the breaker will trip if the distance relay does not detect a line failure. As a result, this over-current relay functions with a time delay that is just slightly longer than the combined working times of the distance relay and the breaker. This DTOC is tested for various types of faults which are 3-phase fault occurring at load 1, 3-phase fault occurring at load 2, a 3-phase fault occurring before primary protection, and the behaviour of voltage and current with a failed primary protection. All the results will be obtained using the MATLAB/Simulink software package.

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Real-time recognition and decision making of objects using deep learning ENet based UAV images

2023-03-29 , Ahmed S.A. , Hazry Desa , Hussain A.S.T.

Unmanned Aerial Vehicles (UAVs) have been found to have many uses in the maintenance and oversight of civil infrastructure assets. They contribute to scheduled bridge checkups, crisis control, electricity transmission cable oversight and traffic analysis. With more and more uses of UAVs being introduced, a greater focus on individuality and freedom regarding governance of these devices is required to ensure security, competency, and precision. The subject of this study outlines the method and policies to be followed for teaching the principals of the (efficient Neural Network) ENet architecture, machine learning, and using OpenCV to implement semantic segmentation on a collection of images obtained through aerial photography for identification of objects. Possible utilizations of UAVs in the area of transportation are mentioned as well along with the precision and efficiency of training for the application of the ENet architecture, machine learning, and OpenCV to implement semantic segmentation, the optimization selection of operational parameters, and the machine learning and ENet architecture teaching methods and policies drafting process. Through analysis of the object identification results, it was proven that by adhering to a specific set of parameters, the ENet architecture and machine learning procedures can successfully identify objects with an accuracy of 99% when there is no distortion. In addition, using a combination of all three technologies mentioned, it is possible to not only classify objects, but the device is also capable of automated tracking and detection of the objects by real-time processing of streamed videos by the UAVs. The novelty, that the ENET was applied for large class members difference distance among the same objects family.

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X-means clustering for wireless sensor networks

2020-09-01 , Radwan A. , Kamarudin N. , Solihin M.I. , Leong H. , Rizon M. , Hazry Desa , Muhammad Azizi Azizan

K-means clustering algorithms of wireless sensor networks are potential solutions that prolong the network lifetime. However, limitations hamper these algorithms, where they depend on a deterministic K-value and random centroids to cluster their networks. But, a bad choice of the K-value and centroid locations leads to unbalanced clusters, thus unbalanced energy consumption. This paper proposes X-means algorithm as a new clustering technique that overcomes K-means limitations; clusters constructed using tentative centroids called parents in an initial phase. After that, parent centroids split into a range of positions called children, and children compete in a recursive process to construct clusters. Results show that X-means outperformed the traditional K-means algorithm and optimized the energy consumption.

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Experimental Analysis of Flight Altitude for Enhanced Agricultural Drone Spraying Performance

2023-01-01 , Hazry Desa , Muhammad Azizi Azizan , Nurfadzillah Ishak , Hang T.X.

Effective rice field management and the proper application of agricultural chemicals are crucial for ensuring agricultural product quality. These chemicals control weeds and protect against insect pests, which can harm crop yields and quality. This research explores the relationship between the altitude at which agricultural drones spray chemicals, spray uniformity, and chemical dispersion. The study assesses drone operations at heights of 1m, 1.5m, and 2m above hollow cone nozzles in 2.8m/s wind conditions. It aims to evaluate droplet uniformity and dispersion on water-sensitive paper placed on paddy plants, analyzed with ImageJ software. Results show that at 1.5m height, there's a significantly higher average droplet density, with 162.7 deposits/cm² in the upper region and 161.8 deposits/cm² in the lower region. Additionally, coverage is notably increased, at 55.21% for the upper region and 51.4% for the lower region. This research highlights the importance of optimal drone altitude for efficient chemical application in rice fields, improving crop protection and yield.

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Experimenting with Variable Arm Quadrotors: Realizing Dynamic Configurations for Enhanced Flight Performance

2024-01-01 , Hazry Desa , Azizi M.

This paper introduces two innovative concepts for variable arms designed for a quadrotor, enabling precise control of its movement through manipulation of the bending moment via varying arm lengths. The primary objective of this research is to develop and identify the most suitable variable arm configuration that facilitates smooth and stable quadrotor movement. The study delves into two concept designs that are well-suited for the quadrotor application. By employing a suitable variable arm, the quadrotor’s maneuverability can be effectively regulated based on the bending moment adjustments made possible by the variable arm. Ultimately, the paper presents the design and performance testing of two types of variable arms. The obtained results confirm that the variable arm of the electric actuator with linear guide-Type 2 exhibits smooth and stable movement.

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Enhancing UAV Safety: Accurate Distance Measurement with YOLOV8-based Measuring Application

2023 , Jack Lee L. , Hazry Desa , Muhammad Azizi A. , Abadal-Salam T.H. , Hassan T.M.

This article introduces a lightweight and efficient model for measuring applications, aimed at enhancing the current UAV monitoring system. The primary objective of this project is to develop a measuring application capable of determining and displaying the distance between the camera on the UAV and the facial model. The YOLOV8 framework is employed as a detection model to identify and interpret objects within the region of interest. Additionally, the algorithm incorporates the concept of focal length in lenses to calculate the distance between the facial expressions of a human face and the camera. To assess the algorithm's accuracy, facial models were placed at various distances from the camera during testing. The predicted distance values obtained through the algorithm were then compared to the actual measured distances using a measuring tape. The results demonstrated a maximum tolerance of ±0.9 cm, indicating the algorithm's reliable performance in predicting distance measurements.

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The sustainability of recycled concrete as green material solution

2020-03-25 , Muhammad Azizi Azizan , Nik Noriman Zulkepli , Hazry Desa , Nurfadzillah Ishak , Dahham O.S. , Umar M.U. , Johari I.

Nowadays, there are lot of concrete waste were produced from demolition, destruction and others. The usage of concrete is not environmentally friendly due to depletion of reserve natural resources, high energy consumption and disposal issues. Construction debris give a large fraction of solid waste disposal problem, and constitutes the large component. By recycling concrete waste for brick production as replacement the other materials, it can reduce the usage of natural resources and disposal problem that have been occur. The aim of this study to determine the sustainability of the recycled concrete by producing a brick using recycled coarse concrete aggregate at nominal size 10mm. An experiment done by comparing the result of the control specimen using 100% natural sand with specimen that have replaced the sand with recycled concrete aggregate for 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 100%. The result showed the optimum recycled concrete to produce a brick is at 90% replacement of RCCA where the compressive strength and flexural was achieved 9.7MPA and 3.53MPA respectively with 16133.33 kg/m3 of density. The water absorption of green brick is 9.23% and the cost of brick have been reduced from Rm0.26 to 0.20.

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