Computational of Flow Behaviours in Compound Meandering Channel with Non-Vegetated and Cross-Over Vegetated Floodplains

Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchiv

Religiosity and intention to whistle blow among Malaysian managers

This paper examines the relationship between religiosity and intention to whistle blow among Malaysian managers. Based on 130 responses and using a modified Glock and Starks’ religiosity index, the study finds that religiosity and seriousness of wrongdoings are not significantly related to whistle blowing intention. Muslim managers prefer to resolve frauds in stages with wrongdoers being counseled and inculcating a more positive work culture rather than to whistle blow

Study on effect of abs control system to the vehicle dynamic behavior during braking on various speed and road condition

The vehicle safety system is divided into two groups that are passive safety and active safety system. While a passive safety system’s purpose is to protect the occupant during an accident, an active safety system’s goal is to enable the vehicle to be controlled to avoid any collision. The passive safety system is a seatbelt, airbag, headrest, etc. Anti-lock Braking System (ABS) is one of many systems under the active safety system, a basic skid control system that can prevent the tire from locking up and enable the vehicle to steer during braking. Another active system is Forward Collision Warning (FCW), Electronic Stability Control (ESC), etc. Even with an active safety system, especially during emergency braking, the vehicle dynamic behavior may change abruptly, which can cause the vehicle to become unstable. The incident may be worse during emergency braking on the wet road condition. This study focuses on analyzing the vehicle dynamic behavior during emergency braking without and with ABS enabled in the system on dry and wet road conditions. The analysis of this study is divided into three phases; to investigate the vehicle dynamic behavior of the UMP test car (Proton Persona) during the braking experiment without ABS, development of the mathematical model of the vehicle and validation with the experimental result, and analyses of the simulation model with implementation of ABS. From the experimental results, on dry road conditions, all experiments conducted from an initial speed of 30 km/h, 50 km/h, and 60 km/h show no locking up occurred. While on wet road conditions, the lock-up condition is shown at front tires starting from the experiment at an initial speed of 50 km/h and 60 km/h. From experimental data, the mathematical model is simulated inside Matlab Simulink, and the model validation using RMSE is all under 10 % for vehicle speed, tire speed, stopping distance and slip ratio. With the addition of ABS inside the model, the simulation was repeated. Only on wet road condition is re-performed as on dry road condition there is no lock-up occur. With ABS enabled in the simulation, it is shown that the speed of all tires decreased gradually and no lock-up occurred. Thus, showing the modelling stay or lower than the optimum range of slip ratio used in the ABS. Additionally, the friction coefficient between the tire and the road was high, meaning the vehicle could be steered properly during braking. Data also shows shorter in both stopping time and stopping distance. The vertical forces also reduce periodically, showing the increase of vehicle stability. Furthermore, with the development of the mathematical model in this research, various ABS algorithms to improve the effectiveness of ABS on the vehicle can be done in future studies

Amphibious house, a novel practice as a flood mitigation strategy in South-East Asia

The vulnerability of flooding in terms of exposing population and assets is increased dramatically over these decades. There are different strategies to prevent or mitigate the flood destructions in urban areas. Floating urbanization is a novel story which motivates people to face with flood rather than fighting with nature. This study proposed the new concept of the amphibious house in lowland area as a flood mitigation strategy. It evaluates the awareness and acceptance level of floodplain settlers to consider amphibious house as a safe shelter for dwelling in lowland area. The VBA programming has been used to develop a designing system for different type of amphibious house. The questionnaire survey was conducted between 6 lowland regions in Malaysia. The level of acceptance and suitability perceptions of the amphibious house were 3.08 and 3.33, which were in moderate level. There was significant higher interest for dwellers who know about floating houses on applying amphibious house

Signage and wayfinding in library planning and design / Ahmad Zulhilmi Azmi and Rosidah Ismail

This article discusses the importance of signage and wayfinding in library planning and design. The bigger the library, the need for good signage and wayfinding system increase. Signage is a library's basic link to users. This is true whether the sign's purpose is to promote impulse "stop and use," to create awareness for the product or service for future reference

Morphology of a Breached Embankment Due to Overtopping Flow

An embankment is a man-made hydraulic structure, is built to provide flood control. It also presents risks to property and life due to their potential to fail and causes catastrophic flooding. In order to mitigate these risks, authorities and regulators need to carefully analyse and inspect embankment dams to identify potential failure modes and protect against them. This paper presents embankment failure morphology and the amount of erosion due to overtopping flow. The breached morphology is analysed for an embankment slope of 1V:3H. The embankment is constructed in the laboratory using a medium sand grain size of non-cohesive soil. The dimension of embankment height is 0.1 m and has been tested with inflows rate of Q = 0.8 ×10-3 m3/s. Experimental results showed that the breached peak discharge is influenced by the morphology of the sediment eroded. The volume loss calculation of the embankment erosion is calculated using SURFER 8, indicating the volume of 0.0079 m3 with the peak breached discharge of 3.63 ×10-3 m3/s, respectively

Vertical profiles of streamwise velocity inside nonand vegetated meandering compound channel

Advances in computer capabilities have increased the interest of using more complex simulation model into solving the Navier Stokes equation in open channel. Computational fluid dynamics using Large Eddy Simulation model were used to simulate the vegetation presence on floodplain along main channel inside meandering compound channel. Simulations were done for two different relative depths for non- and vegetated cases. The measured and predicted inbank streamwise velocitiy were compared at bend apex of the compound channel for validation. Presence of vegetation significantly reduces the velocity in the area near the vegetated main-channel and floodplain interface also in the area protected from the upstream flows. The numerical result shows that the flows inside the main channel were greatly affected by the vegetation especially for low relative depth. Interaction between streamwise velocity of overbank and inbank becomes more complex thus highly turbulence in the area near the vegetation

From Christianity to Islam: an analysis of Ibn Rabban’s approach towards Sira Nabawiyya

With the expansion of Muslim territory in the ninth century, non-Muslim communities’ reactions to the denials of the prophethood of Muhammad created an impact on the development of Islamic prophetology. Vigorous refutations from non-Muslim community, specifically the Jews, Christians and Brahmins urged Muslims to develop a solid mechanism in defence of the status of their beloved Prophet. One of the works that has been recognized as an apparatus to defend the Prophet Muhammad veracity is al-Din wa al-Dawla composed by Ibn Rabban, a physician of the Caliph’s court. This study analyses the novelty of his approaches in exploring Sira Nabawiyya and defending the prophethood of Muhammad. The study employed a descriptive, comparative and critical approach where it analyses and extracts the author original approach in explaining the legitimacy of Muhammad’s prophethood and enlightening the Prophet’s biography. The study argues that most of Ibn Rabban arguments in this work are actually developed from the foundations of Biblical scripture. His style of interpreting Biblical passages indicates a possible dependence on Ibn al-Layth’s letter. However, the way in which he presents Quranic references seems not to be in accordance with Ibn al-Layth’s perspective. This is where the novelty of his approach is distinguished. As a result, the study also affirms that Ibn Rabban imposes his own standards of selection and interpretation of Quranic verses when he applies it as reference to the Prophet’s life

Influence of Two-line Emergent Floodplain Vegetation on a Straight Compound Channel Flow

Abstract: Floods are frequent events occur in Malaysia and cause loss of life, human suffering and widespread damages to buildings, crops and infrastructure. Effort to understanding on this phenomenon is an interesting research. The objectives of this study are to determine the stage-discharge relationship, roughness coefficient and streamwise velocity distribution in a vegetated straight compound channel. The effects of two-line emergent vegetation along the edge of floodplain are studied by using a flume in the Hydraulics Laboratory, Faculty of Civil Engineering, Universiti Teknologi Malaysia (UTM). The results on stage-discharge relationship, Manning’s n and velocity distribution for overbank flows are presented in this paper. From the analysis, it is found that the vegetation influences stage-discharge where retardation of flow takes place. The maximum velocity zone is observed to be in the main channel and less fluid momentum transfer takes place in the presence of vegetation. Vegetated floodplain also influence the increases of channel roughness

The influence of roughness on the propagation of density currents

Density currents occur when fluid of one density propagates along a horizontal boundary into fluid of a different density. They are also called turbidity currents when the main driving mechanism is from suspended sediments. Reservoir sedimentation is often related to sediment transport by turbidity currents. The leading edge of a density current is deeper than the following current and is called head or front. In this paper, the effects of bed roughness on density currents propagation were studied. Experiments were carried out over a smooth bed as well as three artificially roughened beds by cylindrical roughness elements. Temporal and spatial evolutions of the current front were analyzed. In experiments performed over rough beds, the measured head velocities were smaller than that of smooth bed. The observed trend is that as the surface roughness increases the front velocity decreases