scholarly journals Experimental Investigation on Sound Absorption Property of a Panel Board Using Maize Stem

2021 ◽  
Vol 2070 (1) ◽  
pp. 012219
Author(s):  
P Ramshankar ◽  
Binu Sukumar ◽  
S Kishore Kumar ◽  
V Karan ◽  
C Karthick
Keyword(s):  
Experimental Investigation ◽  
Sound Absorption ◽  
Noise Pollution ◽  
Working Environment ◽  
Maize Plant ◽  
Absorption Property ◽  
Structural Elements ◽  
Health Issues ◽  
The Cost ◽  
Good Environment

Abstract In this project our aim is to produce a soundproofing board which is made out of Maize stem (stalk). Due to increase in number of industries, factories and vehicle traffic cause serious noise pollution. So to overcome this, use of Sound proofing panels in the structural elements could significantly help to reduce the sound as well as gives a good environment to work. People nowadays demand for a better working environment. Many commercialized sound proofing materials are available in the market, the cost of these materials would be much higher and also it could cause health issues when people are exposed with the material. So use of sound proofing panels made with agro-waste could be a better solution, an attempt has been made to produce a soundproofing board which is made out of stalk portion of maize plant. The board’s sound absorption property is studied in this research by using Impedance test and the cost of maize stem board is cheap enough so that everyone can afford it.

A seven year plan for upgrading the 200.000 p.e. treatment plant of Uppsala, Sweden

1994 ◽  
Vol 29 (12) ◽  
pp. 117-127
Author(s):  
Jan Erik Lind ◽  
Ernst Olof Swedling
Keyword(s):  
Cost Efficiency ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Working Environment ◽  
Regional Environment ◽  
Nitrogen Reduction ◽  
Total Investment ◽  
Close Cooperation ◽  
The Cost

The sewage treatment plant of Uppsala was originally built in 1946 and has since then been extended and upgraded several times up to 1972 when the last major upgrading was completed. In 1987 it was decided to renew the treatment plant for at least another 20-30 years of operation and to upgrade the biological process to include nitrogen reduction. A 7 year plan covering some 18 items with a total investment cost of approximately 120 MSEK was set in action during 1987. The aim was to raise the cost efficiency by introducing modern techniques, new machinery, a better working environment and a better understanding of the processes used. The need to keep the plant in operation during reconstruction work has caused difficulties, delays and unforseen costs but a close cooperation between all parties concerned (operators, contractors, engineers and the regional environment administration) has solved most of the problems. Experiences so far include an improved effluent quality, a better cost efficiency, a healthier and more engaged operating staff. A research team has been engaged to develop and introduce a nitrogen reduction scheme in the activated sludge process. This has been a challenging and fruitful experience.

Effect of Coating Thickness on Sound Absorption Property of Four Wood Species Commonly Used for Piano Soundboards

2020 ◽  
Vol 52 (1) ◽  
pp. 28-43 ◽  
Author(s):  
Wei Xu ◽  
Xiaoyang Fang ◽  
Jiatong Han ◽  
Zhihui Wu ◽  
Jilei Zhang
Keyword(s):  
Coating Thickness ◽  
Wood Species ◽  
Sound Absorption ◽  
Absorption Property

Prototype of Compact Flexural Fatigue Testing Machine

2014 ◽  
Vol 554 ◽  
pp. 350-354
Author(s):  
Muhammad Azrie Husainy Mohd Jasri ◽  
Mohd Afendi ◽  
A.H.M. Fauzi
Keyword(s):  
Fatigue Failure ◽  
Electromagnetic Force ◽  
Fatigue Testing ◽  
Testing Machine ◽  
Working Environment ◽  
Motion Sensor ◽  
Flexural Fatigue ◽  
The Real ◽  
The Cost ◽  
Dynamic Fatigue

The purpose of this project is to build a prototype of compact flexural fatigue testing machine and to strive for an easy working-environment as required by the users besides cutting the cost of the machining. This particular project is about to build the prototype of compact flexural fatigue testing machine in compact mode. In this project, the prototype will be functioning 60% similar to the real fatigue machine which is Dynamic Fatigue Testing Machine (INSTRON) due to timer counter, frequency and load applied. But the new invention is this prototype was using the concept of electromagnetic force relay that will apply to the specimen using the application of basic electronics. The motion sensor also being applied to this prototype to achieve accurate results when the specimen breaks up after undergoes a fatigue failure.

Letter to the Editor

PEDIATRICS ◽  
1994 ◽  
Vol 93 (1) ◽  
pp. 151-152
Author(s):  
Caroline Breese Hall ◽  
Harold S. Margolis
Keyword(s):  
Public Health ◽  
Private Practice ◽  
Clinton Administration ◽  
Health Issues ◽  
Childhood Immunization ◽  
Letter To The Editor ◽  
The Many ◽  
The Cost

We appreciate the concerned letter of Dr Jacobs and his thoughtful questions arising both from his knowledge of the recommendations and public health issues, as well as those of private practice. The cost of vaccines is an issue with which we must all be concerned. By highlighting the importance of childhood immunization the Clinton administration has engendered interest and, thus, optimism that efforts toward reducing the cost will be successful. However, we should remember that the many excellent studies that have analyzed the reasons why children are not being vaccinated have shown that cost is not the major factor, but access, difficulties, and obstacles, real and perceived, to obtaining immunizations are.

Experimental investigation on the use of fly ash for lightweight precast structural elements

1996 ◽  
Vol 29 (10) ◽  
pp. 632-638 ◽  
Author(s):  
G. Dinelli ◽  
G. Belz ◽  
C. E. Majorana ◽  
B. A. Schrefler
Keyword(s):  
Experimental Investigation ◽  
Fly Ash ◽  
Structural Elements

scholarly journals Evaluasi dan Retrofit Struktur Gedung Beton Bertulang Akibat Kebakaran

2021 ◽  
Vol 17 (1) ◽  
pp. 57-67
Author(s):  
Nurul Hidayati ◽  
Henricus Priyosulistyo ◽  
Andreas Triwiyono
Keyword(s):  
Site Investigation ◽  
Office Building ◽  
Building Structure ◽  
Structural Stiffness ◽  
Structural Elements ◽  
Concrete Material ◽  
Steel Bracing ◽  
The Cost ◽  
The Impact ◽  
Cfrp Wrapping

ABSTRACT Several studies have been carried out related to the impact of fire on the strength of reinforced concrete material. It shows that there is a decrease in strength and a decrease in structural stiffness. The degree of damage is dependent on the temperature and duration of the fire. To ensure accessibility, the building needs to be evaluated whether the building can be re-functioned immediately. The results of site investigation are evaluated to determine the structure retrofit and reinforcement methods and cost-effectiveness compared to the cost of a new building. The office building structure under review is analytically evaluated based on SNI 1726:2019 and SNI 1727:2018. The results showed that 31% of columns and 32% of beams need to be strengthened. In addition, steel bracing and CFRP wrapping on the structural elements were applied. The cost of retrofitting required Rp2.998.488.781,07, which is lower than the cost of the new building structure, which costs Rp4.950.087.016,34. ABSTRAKBeberapa penelitian yang telah dilakukan terkait dampak kebakaran terhadap kekuatan material beton bertulang, memperlihatkan bahwa terdapat penurunan kekuatan dan kapasitas struktur. Tingkat penurunan tergantung antara lain pada suhu dan durasi kebakaran. Untuk meyakinkan tingkat fisibilitas, gedung tersebut perlu dievaluasi kemungkinan dapat atau tidaknya gedung itu difungsikan kembali. Hasil evaluasi tersebut dijadikan pertimbangan dalam menentukan metode perbaikan dan perkuatan yang efektif untuk kemudian dibandingkan dengan biaya pembangunan gedung baru. Struktur gedung kantor PLN Unit Cabang Distribusi Jakarta Raya ini akan dievaluasi dengan cara analitis berdasarkan SNI 1726:2019 dan SNI 1727:2018. Terdapat total 31% kolom dan 32% balok yang perlu diperkuat. Metode perkuatan yang digunakan adalah penambahan bracing baja dan CFRP. Material CFRP tersebut dililitkan pada elemen struktur. Biaya perkuatan yang diperlukan adalah Rp2.998.488.781,07, lebih rendah dibandingkan nilai struktur gedung, yaitu Rp4.950.087.016,34.

scholarly journals Impacts of vehicle tire on slip resistance and sound pollution in asphalt pavements

2021 ◽  
Vol 2 (3) ◽  
pp. 16-21
Author(s):  
Saeed Abbassi
Keyword(s):  
Urban Areas ◽  
Noise Pollution ◽  
Sound Level ◽  
Asphalt Pavements ◽  
Fine Grained ◽  
Sensitive Areas ◽  
Slip Resistance ◽  
Materials Used ◽  
The Cost ◽  
Pavement Friction

Noise pollution caused by vehicle traffic is one of the major problems in urban areas with road expansion. Due to the increase in the cost of construction and installation of sound walls to deal with noise pollution, to deal with this problem should look for methods that do not have additional costs and operating costs. Improving the pavement texture is one of the most effective ways to reduce tire noise and pavement and reduce the asphalt surface’s sound. To evaluate the slip resistance of asphalt, the English pendulum test according to ASTM E303-74 standard was performed on wet parts of asphalt in wet conditions. This device is used to examine the fine texture of the pavement. The number of pavement friction with a negative coefficient of 0.1469 has an inverse ratio with the intensity of sound level increases the number of pavement friction aligned with the amount of sound level created decreases. On the other hand, the depth of pavement texture, which is determined as the size of pavement materials, with a coefficient of 0.2810, has a direct ratio with the amount of noise pollution, and the smaller the number of fine-grained materials used will increase the sound level. According to the results of the coefficients estimated from the equation, it can be concluded that the preparation of pavements with an amount of friction can reduce the amount of noise pollution emitted by the movement of vehicles, especially in urban areas and sensitive areas. Therefore, it is recommended that in acoustically sensitive areas, in preparing pavements, arrangements be made to use coarser materials and maintain proper pavement resistance. For this purpose, in this article, the pavement’s texture is examined in the amount of noise created due to the tire’s interaction and the pavement.

scholarly journals A mathematical model for production routing of mechanical engineering products

2021 ◽  
Vol 25 (3) ◽  
pp. 332-341
Author(s):  
I. V. Fokin ◽  
A. N. Smirnov
Keyword(s):  
Mathematical Model ◽  
Mechanical Engineering ◽  
Complex Geometry ◽  
3D Models ◽  
Point Of View ◽  
Structural Elements ◽  
Production Environment ◽  
Automatic Mode ◽  
The Cost ◽  
Production Routing

The aim was to create a mathematical model describing the development of a production (shop-to-shop) routing of mechanical engineering products based on a 3D model and allowing the cost of the final product to be reduced. The developed mathematical model was simulated based on 3D models designed in the Siemens NX system, which were subsequently imported into the *stp format and recognized by a designed module written in the Phyton programming language. The factors of the production environment affecting the formation of the production routing of mechanical engineering products were determined. A diagram of the algorithm for the “constructive element - technological operation - means of technological equipment (equipment-tool)” relationship was developed. Based on the results of testing the developed mathematical model, the use of neural networks as a tool for the implementation and automation of the work was found advantageous as compared to the standard scheme of work of a process engineer when developing a production routing of mechanical engineering products. These advantages include a decrease in the time for the development of a routing and the cost of the final product. The developed model has a practical limitation consisting in a rather complex geometry of some structural elements of a unit, which impedes the development of an algorithm for recognizing their structure. The use of a neural network prototype in automatic mode is advisable for relatively simple parts (including a flange, hole, chamfer and rounding). However, since the number of simple units from the recognition point of view amounts to about 40% among the nomenclature of manufactured units, the reduction in the development time of the technological process in comparison with the conventional approach comprises only 10–25% of the total time of technological preparation.

scholarly journals KNOWLEDGE GAP DAN ADAPTASI LINGKUNGAN KERJA KARYAWAN LOKAL DI HOTEL MILIK ASING

KRITIS ◽  
2017 ◽  
Vol 26 (2) ◽  
pp. 176-193
Author(s):  
Janio Abilio Madeira Soares ◽  
Titi Susilowati Prabawa
Keyword(s):  
Knowledge Transfer ◽  
Learning By Doing ◽  
Qualitative Approach ◽  
Working Environment ◽  
Capital City ◽  
Positive Effects ◽  
Internal Conflicts ◽  
Timor Leste ◽  
The Cost ◽  
Depth Interviews

This research is meant to explore how local employees who work in International hotels in Dili, the capital city of Timor Leste adapt to the working environment. Without enough knowledge about hospitality, they acquire the skills through the knowledge transfer from the senior workers and through learning by doing. This research uses qualitative approach. In order to obtain data, in-depth interviews were done with 16 employees of the two hotels under research, i.e., Novo Turismo Hotel and Timor Plaza hotel. The research finds that kinship value in their working environment helps to accelerate transfer knowledge for the employees in Novo Turismo Hotel dan Timor Plaza. The process brings positive effects to training fund, potentials of internal conflicts and the cost of damages caused by the negligence of local employees.

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