scholarly journals Impact and Control of Reflected Noise from an Overpass Bottom

2018 ◽  
Vol 8 (10) ◽  
pp. 1908
Author(s):  
Chi-Chwen Lin ◽  
Yen-Ping Peng ◽  
Yung-Pin Tsai ◽  
Yu-Chen Chang ◽  
Ku-Fan Chen
Keyword(s):  
Noise Level ◽  
Sound Absorption ◽  
Noise Source ◽  
Model Simulation ◽  
Buffer Zone ◽  
Residential Area ◽  
Discernible Effect ◽  
Absorbing Material ◽  
And Control ◽  
The Impact

This study examines the effects of noise reflected from the overpass bottom under various conditions using onsite measurements and model simulation. Reflected noise from the overpass bottom may be as high as 8 dB(A). Bottom materials (steel and reinforced concrete (RC)) have no discernible effect on the reflected noise level. As the height of an overpass increases, the level of reflected noise decreases. When an overpass is parallel to the noise source (i.e., the freeway), the size of the area impacted by reflected noise increases. As the sound absorption rating of the material installed at the overpass bottom increased, the level of reflected noise decreased. A sound absorbing material with a sound absorption rate of at least 0.60 is recommended to reduce reflected noise level. When the distance between the overpass side and a receiver exceeded 30 m, the level of reflected noise level reduced significantly. Therefore, if the distance between a residential area and overpass could be increased to create a buffer zone coupled with the installation of sound absorbing material at the overpass bottom, the impact of reflected noise on nearby residents can be reduced.

Fall on Backpack: Damage Minimizing Humanoid Fall on Targeted Body Segment Using Momentum Control

2011 ◽  
Author(s):  
Sung-Hee Lee ◽  
Ambarish Goswami
Keyword(s):  
Impact Damage ◽  
Humanoid Robots ◽  
Control Algorithms ◽  
Body Segment ◽  
Dynamic Coupling ◽  
Planning And Control ◽  
Critical Issues ◽  
Absorbing Material ◽  
And Control ◽  
The Impact

Safety and robustness will become critical issues when humanoid robots start sharing human environments in the future. In physically interactive human environments, a catastrophic fall is the main threat to safety and smooth operation of humanoid robots, and thus it is critical to explore how to manage an unavoidable fall of humanoids. This paper deals with the problem of reducing the impact damage to a robot associated with a fall. A common approach is to employ damage-resistant design and apply impact-absorbing material to robot limbs, such as the backpack and knee, that are particularly prone to fall related impacts. In this paper, we select the backpack to be the most preferred body segment to experience an impact. We proceed to propose a control strategy that attempts to re-orient the robot during the fall such that it impacts the ground with its backpack. We show that the robot can fall on the backpack even when it starts falling sideways. This is achieved by utilizing dynamic coupling, i.e., by rotating the swing leg aiming to generate spin rotation of the trunk (backpack), and by rotating the trunk backward to drive the trunk to touch down with the backpack. The planning and control algorithms for fall are demonstrated in simulation.

scholarly journals Influence of Sound-Absorbing Material Placement on Room Acoustical Parameters

Acoustics ◽  
2019 ◽  
Vol 1 (3) ◽  
pp. 644-660 ◽  
Author(s):  
Jose Cucharero ◽  
Tuomas Hänninen ◽  
Tapio Lokki
Keyword(s):  
Speech Intelligibility ◽  
Sound Absorption ◽  
Sound Field ◽  
Acoustical Parameters ◽  
Open Plan ◽  
Absorbing Material ◽  
The Impact

The reverberation of a room is often controlled by installing sound absorption panels to the ceiling and on the walls. The reduced reverberation is particularly important in classrooms to maximize the speech intelligibility and in open-plan offices to make spaces more pleasant. In this study, the impact of the placement of the absorption material in a room was measured in a reverberation room and in a mockup classroom. The results show that absorption material is less efficient if it is mounted to the corners or on the edges between the walls and ceiling, if the sound field is more or less diffuse. If the room modes dominate the sound field, the most efficient location for the sound-absorbing material was found at one of the surfaces causing the modes. The results help acoustical consultants to place the absorption material in optimal locations and, generally, minimize the amount of material and save costs.

Assessment of nocturnal insects in desert locust habitat after the application of insecticides against Desert Locust in Sub-Zoba Shieb, Eritrea

2018 ◽  
Vol 3 (01) ◽  
pp. 6-10
Author(s):  
Daniel Brhane ◽  
Adugna Haile
Keyword(s):  
Buffer Zone ◽  
Control Plot ◽  
Desert Locust ◽  
Population Count ◽  
Significant Difference ◽  
Locust Control ◽  
And Control ◽  
The Impact ◽  
Lower Population ◽  
Insecticide Control

The study on the impact of insecticide nocturnal insects used to control desert locust was conducted at Shelshela, sub-region Shieb from November 2015 to February 2016. Its aim was to assess the impact of Desert Locust control insecticides spray on non-target arthropods. The experiment was carried out in RCBD using three treatments of fenitrothion 96% ULV, chlorpyrifos 45% ULV and control with three replications. It was replicated three times. Each plot had a size of 1 ha with a buffer zone among plots and blocks were 100 m. Data were recorded two times at pre-sprays and five times at post-sprays. During study period 4 insect families were observed and data were analyzed. These were Calliphoridae, Elateridae, Scarabidae, and Pselaphidae. In pre-spray, data did not show significant difference among treatments used. After 48 hrs of post-spray result showed significant difference among treatments. Both insecticides treated plots showed significantly lower population count than control plot. Between the treatments used fenitrothion treated plots generally showed more reduction in population count than chlorpyrifos. From the study it is observed that Elateridae can be used as bio-indicator during insecticide control of desert locust in the study areas.

scholarly journals The Influence of Yarn and Weave Structures on Acoustic Materials and the Effect of Different Acoustic Signal Incidence Angles on Woven Fabric Absorption Possibilities

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2814
Author(s):  
Bethalihem Teferi Samuel ◽  
Marcin Barburski ◽  
Jaroslaw R Blaszczak ◽  
Ewa Witczak ◽  
Katarzyna Abramczyk
Keyword(s):  
Sound Absorption ◽  
Structure Type ◽  
Woven Fabrics ◽  
Woven Fabric ◽  
Polyester Yarn ◽  
Absorption Properties ◽  
Internal Structures ◽  
Absorbing Material ◽  
Points Of View ◽  
The Impact

Utilizing textile-based acoustic materials can be considered basically from two points of view. First, it may be used as a sound absorbing material. Second, it may be used as a decoration that gives the surrounding area a new artistic appearance. To improve the acoustic possibilities of any woven fabric, it is necessary to study the influences of yarn characteristics and the internal structures of weave interlacement. To understand the impact of the yarn on the fabric, the samples were prepared using only polyester fiber as textured, twisted, and staple yarns. Regarding this experiment, the basic weave’s structure type, such as plain, rib, sateen, and twill, were used. Overall, 16 woven fabrics were prepared. The investigation was performed in the range of low to medium acoustic frequencies. The experiments were conducted in an anechoic chamber. Compared to other yarn types, fabrics formed from textured polyester yarn had higher sound absorption properties. Moreover, the observed results show that the different incidence angles of acoustic signals influence the measured sound absorption properties of a textile.

scholarly journals Memory-Dependent Model for the Dynamics of COVID-19 Pandemic

2020 ◽  
Author(s):  
K.M. Furati ◽  
I.O. Sarumi ◽  
A.Q.M. Khaliq
Keyword(s):  
Fractional Order ◽  
Public Perception ◽  
Model Simulation ◽  
Transmission Rate ◽  
Optimal Order ◽  
Dependent Model ◽  
Exponential Time Differencing Method ◽  
And Control ◽  
The Impact ◽  
Mean Square Errors

AbstractCOVID-19 pandemic has impacted people all across the world. As a result, there has been a collective effort to monitor, predict, and control the spread of this disease. Among this effort is the development of mathematical models that could capture accurately the available data and simulate closely the futuristic scenarios. In this paper, a fractional-order memory-dependent model for simulating the spread of COVID-19 is proposed. In this model, the impact of governmental action and public perception are incorporated as part of the time-varying transmission rate. The model simulation is performed using the two-step generalized exponential time-differencing method and tested for data from Wuhan, China. The mean-square errors demonstrate the merit of the fractional-order model and provide a good estimate of the optimal order.

scholarly journals Noise Impact of Southgate Phase-2 Construction Project to the Settlement at Perumahan Tanjung Mas, Tanjung Barat

2021 ◽  
Vol 3 (01) ◽  
pp. 44-53
Author(s):  
Askarini Sekar Putri
Keyword(s):  
Noise Level ◽  
Noise Source ◽  
Quality Standard ◽  
Sound Level ◽  
Phase 2 ◽  
The People ◽  
Regulatory Standards ◽  
The Us ◽  
Level Meter ◽  
The Impact

Construction activities can increase noise that gives an impact on the people who live nearby. The impact of noise can cause psychological and physiological disorders. The purpose of this research is to analyze the effects of the noise level of the Southgate Phase-2 project for citizen activities at PerumahanTanjung Mas, Tanjung Barat. It is based on regulatory standards in KEPMEN LH no. 48 of 1996, KEPGUB DKI Jakarta no. 551 of 2001, and the LNP standard according to the US Department of Housing and Urban Development. The methods are doing observation and survey by using a questionnaire to find out the project situation and the noise level produced by using a sound level meter measuring instrument. The result shows that people feel discomfort from the noise of the project, especially at night. Most of the noise measurement result exceeds the noise quality standard and its effects up to 50 meters away from the noise source. The point which is about 5 meters away from the noise source is 63.73 dB (A) and point which is about 50 meters away from the noise source is 59.89 dB (A). Based on the results of the regression equation shows that houses within 120 meters of the project impacted by the noise that exceeds the noise quality standards for the residential area. The most complaints given by people of PerumahanTanjung Mas were feeling discomfort in daily activities (79%), and sleeping trouble (60%).

Fall on Backpack: Damage Minimization of Humanoid Robots by Falling on Targeted Body Segments

2012 ◽  
Vol 8 (2) ◽  
Author(s):  
Sung-Hee Lee ◽  
Ambarish Goswami
Keyword(s):  
Management Strategy ◽  
Impact Damage ◽  
Humanoid Robots ◽  
Control Algorithms ◽  
Dynamic Coupling ◽  
Planning And Control ◽  
Critical Issues ◽  
Absorbing Material ◽  
And Control ◽  
The Impact

Safety and robustness will become critical issues when humanoid robots start sharing human environments in the future. In physically interactive human environments, a catastrophic fall is a major threat to the safety and smooth operation of humanoid robots. It is, therefore, imperative that humanoid robots be equipped with a comprehensive fall management strategy. This paper deals with the problem of reducing the impact damage to a robot associated with a fall. A common approach is to employ damage-resistant design and apply impact-absorbing material to robot limbs, such as the backpack and knee, that are particularly prone to fall related impacts. In this paper, we select the backpack to be the most preferred body segment to experience an impact. We proceed to propose a control strategy that attempts to reorient the robot during the fall such that it impacts the ground with its backpack. We show that the robot can fall on the backpack even when it starts falling sideways. This is achieved by generating and redistributing angular momentum among the robot limbs through dynamic coupling. The planning and control algorithms for a fall are demonstrated in simulation.

Suppressed, but Not Forgotten

2011 ◽  
Vol 70 (1) ◽  
pp. 5-11 ◽  
Author(s):  
Beat Meier ◽  
Anja König ◽  
Samuel Parak ◽  
Katharina Henke
Keyword(s):  
Memory Trace ◽  
Thought Suppression ◽  
Test Phase ◽  
Indirect Test ◽  
Final Test ◽  
Test Experiment ◽  
And Control ◽  
Cue Words ◽  
The Impact

This study investigates the impact of thought suppression over a 1-week interval. In two experiments with 80 university students each, we used the think/no-think paradigm in which participants initially learn a list of word pairs (cue-target associations). Then they were presented with some of the cue words again and should either respond with the target word or avoid thinking about it. In the final test phase, their memory for the initially learned cue-target pairs was tested. In Experiment 1, type of memory test was manipulated (i.e., direct vs. indirect). In Experiment 2, type of no-think instructions was manipulated (i.e., suppress vs. substitute). Overall, our results showed poorer memory for no-think and control items compared to think items across all experiments and conditions. Critically, however, more no-think than control items were remembered after the 1-week interval in the direct, but not in the indirect test (Experiment 1) and with thought suppression, but not thought substitution instructions (Experiment 2). We suggest that during thought suppression a brief reactivation of the learned association may lead to reconsolidation of the memory trace and hence to better retrieval of suppressed than control items in the long term.

Research Participation Experiences of Informants of Suicide and Control Cases

Crisis ◽  
2010 ◽  
Vol 31 (5) ◽  
pp. 238-246 ◽  
Author(s):  
Paul W. C. Wong ◽  
Wincy S. C. Chan ◽  
Philip S. L. Beh ◽  
Fiona W. S. Yau ◽  
Paul S. F. Yip ◽  
...  
Keyword(s):  
Ethical Issues ◽  
Research Participation ◽  
Self Report ◽  
Initial Contact ◽  
Psychological Autopsy ◽  
Autopsy Study ◽  
The People ◽  
And Control ◽  
The Impact

Background: Ethical issues have been raised about using the psychological autopsy approach in the study of suicide. The impact on informants of control cases who participated in case-control psychological autopsy studies has not been investigated. Aims: (1) To investigate whether informants of suicide cases recruited by two approaches (coroners’ court and public mortuaries) respond differently to the initial contact by the research team. (2) To explore the reactions, reasons for participation, and comments of both the informants of suicide and control cases to psychological autopsy interviews. (3) To investigate the impact of the interviews on informants of suicide cases about a month after the interviews. Methods: A self-report questionnaire was used for the informants of both suicide and control cases. Telephone follow-up interviews were conducted with the informants of suicide cases. Results: The majority of the informants of suicide cases, regardless of the initial route of contact, as well as the control cases were positive about being approached to take part in the study. A minority of informants of suicide and control cases found the experience of talking about their family member to be more upsetting than expected. The telephone follow-up interviews showed that none of the informants of suicide cases reported being distressed by the psychological autopsy interviews. Limitations: The acceptance rate for our original psychological autopsy study was modest. Conclusions: The findings of this study are useful for future participants and researchers in measuring the potential benefits and risks of participating in similar sensitive research. Psychological autopsy interviews may be utilized as an active engagement approach to reach out to the people bereaved by suicide, especially in places where the postvention work is underdeveloped.

Using Work Domain Analysis to Evaluate the Impact of Digitization on Command and Control

2008 ◽  
Author(s):  
Daniel P. Jenkins ◽  
Neville A. Stanton ◽  
Paul M. Salmon ◽  
Guy H. Walker
Keyword(s):  
Command And Control ◽  
Domain Analysis ◽  
Work Domain Analysis ◽  
And Control ◽  
The Impact ◽  
Work Domain
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