Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "noise level" wg kryterium: Temat

  Lista filtrów
Wyrównaj
Wyświetlanie 1-15 z 45
Tytuł:
Traffic Noise and its Impact on Wellness of the Residents in Sambalpur City – a Critical Analysis
Autorzy:
Sahu, Alekh Kumar
Nayak, Satish Kumar
Mohanty, Chitta Ranjan
Pradhan, Prasanta Kumar
Powiązania:
https://bibliotekanauki.pl/articles/1953465.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
traffic noise
equivalent continuous noise level
annoyance
wellness
noise exposure index
Opis:
Noise is unwanted sound judged to be unpleasant, loud or disruptive to hearing. Like air pollution, noise pollution is one of the serious matters of concern in urban areas. Noise pollution occurs when noise level exceeds certain limit and has deleterious effects on human health and wellness. The major sources of noise pollution are industries, road traffic, railways, airplane traffic and social celebrations. The traffic noise is notably high in cities due to higher density of population, frequent movement of people, good transport system coupled with increasing numbers of vehicles (on road). In this work, the assessments of traffic noise in Sambalpur city is presented. Twelve important locations were chosen for the assessment. Noise contours were drawn to visualize the spreading of traffic noise into its surroundings. At the same time, the effect of noise pollution on wellness of the exposed people was studied. The study shows that the traffic noise level and its effects, are both in an alarming stage in the city.
Źródło:
Archives of Acoustics; 2021, 46, 2; 353-363
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Noise vulnerability mapping using geospatial technique in part of Ibadan north east local government area
Autorzy:
Oni, Olukunle O.
Adetimirin, O. I.
Ajibade, S. A.
Kolade, K. R.
Ilesanmi, O. I.
Akinluyi, F. O.
Powiązania:
https://bibliotekanauki.pl/articles/1189960.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Digital Sound Level Meter (DSLM)
Inverse Distance Weighted (IDW)
Mean Noise Level
Noise Level Point
and Sound Level for Morning
Afternoon and Evening (Lm_a_e)
Opis:
Human activity is main source of all environmental pollutions. Noise is common environmental issuesthat cannot be generated without geospatial location. It has great impact on mankind such as physical disturbance, physiological disturbance and affects human health. The aim of this research work is to identify the geospatial noise level and mapping noise vulnerability in some part of Ibadan North East Local Government Area. DSLM and GPS are used for survey method in which sixteen different location points were selected for noise vulnerability. The Mathematical Model is used to calculate Equivalent continuous sound level for morning, afternoon and evening (Lm_a_e), mean noise level for the morning, afternoon, evening and Daily Average of Noise values were generated. World Health Organization (WHO) recommendation standard was used as a standard in this research because Nigeria Noise pollution bill is still under consideration in the National Assembly. ArcGIS software was used for analysis and noise zones were carved out based on WHO yardsticks. Noise vulnerability mapping generated shown that land uses within the study area were experiencing very higher noise levels which are risky to the environment and society. Environmental agency and Government should set standard values for the noise barriers by passing the noise bill in the National Assembly assiduously and soonest.
Źródło:
World Scientific News; 2016, 52; 143-161
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Study on the Effects of Human Age, Type of Computer and Noise on Operators’ Performance of a Data Entry Task
Autorzy:
Khan, Z. A.
Rizvi, S. A. H.
Powiązania:
https://bibliotekanauki.pl/articles/91125.pdf
Data publikacji:
2010
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
equivalent noise level
age
visual display units
data entry task performance
Opis:
The effects of human age, type of computer, and noise on computer operators’ performance of a data entry task were investigated. Twenty male subjects aged 10–55 were assigned into 4 age groups each consisting of 5 persons. They performed the task for 15 min on desktop and laptop computers in a sitting posture under varying levels of noise. The mean number of characters entered per minute (MNCEPM) was statistically analyzed. Operators in the 16–25 age group achieved the highest rate of data entry at each level of noise investigated. Operators performed better on desktop than on laptop computers. Their performance decreased when noise level increased from 82 to 92 dB(A), but it improved at 102 dB(A). The effects of age and noise were statistically significant. However, the effects of the type of computer, the interactions between age and type of computer, age and noise level, and type of computer and noise were not found to be statistically significant.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2010, 16, 4; 455-463
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Study on the Effect of Human Laterality, Type of Computer and Noise on Operators’ Performance of a Data Entry Task
Autorzy:
Khan, Z. A.
Rizvi, S. A. H.
Powiązania:
https://bibliotekanauki.pl/articles/90760.pdf
Data publikacji:
2009
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
equivalent noise level
motor-sidedness
visual display units
data entry task performance
Opis:
Effects of human laterality, type of computer and noise on computer operators’ performance of a data entry task were investigated. Seven right- and 7 left-motorsided male subjects performed the task on desktop and laptop computers in a sitting posture under varying noise levels. The mean number of characters entered per minute was statistically analysed. The right-motorsided operators entered more data than left-motorsided ones at each noise level. Operators performed better on desktop computers. Operators’ performance decreased when noise level increased from 82 to 92 dB(A) but it improved at 102 dB(A). Effects of laterality, type of computer and noise, and the interaction between laterality and noise were statistically significant. The interactions between laterality and type of computer, and type of computer and noise were statistically insignificant. Laterality was statistically significant at all noise levels and noise was statistically significant for right motor-sided operators only.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2009, 15, 1; 53-60
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relationship Between Chinese Speech Intelligibility of Elderly and Speech Transmission Index
Autorzy:
Peng, Jianxin
Zeng, Jiazhong
Zhao, Yuezhe
Powiązania:
https://bibliotekanauki.pl/articles/1953494.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
speech intelligibility
speech transmission index
signal-to-noise ratio
background noise level
speech sound pressure level
reverberation time
Opis:
In this paper, the relationship between Chinese speech intelligibility (CSI) scores of the elderly aged 60-69 and over 70 years old, and speech transmission index (STI) were investigated through the auralization method under different reverberation time and background noise levels (BNL, 40 dBA and 55 dBA). The results show that the CSI scores of the elderly are significantly worse than those of young adults. For the elderly over 70, the CSI scores become much lower than those of young adults. To be able to achieve the same CSI, the elderly, especially those over 70, need much higher STI and greater SNR than the young. The elderly aged 60-69 and over 70 need to improve their STI by 0.419 and 0.058 respectively under BNL 40 dBA, as well as 0.282 and 0.072 respectively under BNL 55 dBA, so as to obtain the same CSI scores as the young adults.
Źródło:
Archives of Acoustics; 2021, 46, 2; 229-235
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Review of research results concerning the modelling of shipping noise
Autorzy:
Yan, Xiaowei
Song, Hao
Peng, Zilong
Kong, Huimin
Cheng, Yipeng
Han, Linjiang
Powiązania:
https://bibliotekanauki.pl/articles/1573577.pdf
Data publikacji:
2021
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
shipping noise
noise source level model
measurement standard
ocean ambient noise
Opis:
The effect of underwater radiated noise (URN) pollution (produced by merchant ships) on marine ecology has become a topic of extreme concern for both the academic community and the general public. This paper summarises some research results and modelling about shipping noise published over several decades, which comprises the research significance of low-frequency ambient noise and shipping noise, shipping noise source levels (SL), empirical models and the measurement standards of shipping noise. In short, we try to present an overall outline of shipping noise and ocean ambient noise for related research.
Źródło:
Polish Maritime Research; 2021, 2; 102-115
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research of noise in tractor K700 cabin
Autorzy:
Pobedin, A. V.
Dolotov, A. A.
Iskaliev, A. I.
Potapov, P. V.
Powiązania:
https://bibliotekanauki.pl/articles/242604.pdf
Data publikacji:
2015
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
capital repair
sound pressure level
noise total level
noise spectre
tractor
cabin
measuring
Opis:
This paper briefly describes method of noise-measuring tractor’s K700 cabin, obtained noise spectres were analysed and recommendations based on these results for noise decreasing in cabin K700 are proposed. Air noise penetrates into the tractor’s K700 cabin through panels, enclosures, apertures, chinks etc. Structural noise in the cabin is caused by vibrations transfer from sources along tractor frame through vibration isolators to cabin walls and carcass. At that, the main noise sources are engine case, air system, exhaust system, engine cooling system fan and also transmission case located under cabin floor. Every panel in the cabin has own intensity of sound waves radiation and thus contributes to forming of the sound field on the operator workspace. Therefore, it is important to know the sound pressure level near every panel into the cabin. It was state that at low frequencies, noise from left windshield prevails. In addition, in high frequencies bands the highest sound pressure issues from partition between engine area and cabin. Noise spectres have sound pressure peaks in bands with centre frequencies. Total noise level perceived by operator in tractor cabin is less during tractor motion on dirt road without aggregate than during its work with seeding machine on field prepared for winter grasp. At that, partition between engine area and cabin contributes greatly. Thus, for integrated noisiness, reducing in the tractor cabin sound isolation of partition between engine area and cabin should be increased and also sound isolation of windshields located closely to exhaust pipe has to be improved. To decrease low-frequency noise optimization of tractor cabin vibration isolation system need to be performed.
Źródło:
Journal of KONES; 2015, 22, 1; 261-264
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Legal regulations for protection of the environment from the noise and the current requirements for permissible noise level in Poland
Regulacje prawne w zakresie ochrony środowiska naturalnego przed hałasem oraz aktualne wymagania dotyczące dopuszczalnego poziomu hałasu obowiązujące w Polsce
Autorzy:
Kossakowski, P.
Wciślik, W.
Powiązania:
https://bibliotekanauki.pl/articles/402082.pdf
Data publikacji:
2013
Wydawca:
Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:
protection against the noise
legal regulations
permissible noise level
ochrona przed hałasem
regulacje prawne
dopuszczalny poziom hałasu
Opis:
The article describes the basic legal acts in Poland in the field of protection against the noise in the environment. Permissible noise levels associated with road and rail traffic and other activities, in areas with different purposes are described. The variations of the requirements that have taken place over the past years are also characterized. The permissible noise levels, defined by different acts, are compared. In addition, the basic acts associated with monitoring and management of noise pollution are presented.
Źródło:
Structure and Environment; 2013, 5, 1; 34-41
2081-1500
Pojawia się w:
Structure and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of Changes of the Permissible Railway Noise Levels on Possibilities of Spatial Management in Urban Areas
Wpływ zmian dopuszczalnych poziomów hałasu kolejowego na możliwości zagospodarowania przestrzennego terenów miejskich
Autorzy:
Podawca, Konrad
Staniszewski, Ryszard
Powiązania:
https://bibliotekanauki.pl/articles/1811997.pdf
Data publikacji:
2019
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
spatial planning
railway noise
permissible noise level
sustainable development
planowanie przestrzenne
hałas kolejowy
dopuszczalny poziom hałasu
rozwój zrównoważony
Opis:
In this paper problem of noise caused by railway in cities was studied. This aspect was often marginalised in spatial planning process. Using example of areas located in Włochy district (Warsaw, Poland) the function of area and the new permissible sound levels were shown. Analyses based on data obtained from Warsaw acoustic maps generated in the year 2017, spatial management plans and current state of development and investments inside borders of real estate 2-08-10 and 2-08-11. Based on 22 superficial and quantitative features related to 50 and 59 dB limit sound levels at night and 55, 60, 64 and 68 dB at day-evening-night time, changes in the spatial development possibilities in the analysed area were shown. On the base of area indices and using ArcGis software positive and negative aspects of studied area were presented. The analysis clearly showed that the increase in sound levels by 9 dB at night and 8-9 dB during daylight-night-time resulted in the reduction of areas considered to be susceptible to noise before 2012 by 71.9-76.3%, and decrease of the number of buildings exposed to noise by 70-80%. However, the analysis of the local spatial development plans and the Study of Conditions and Directions of Spatial Development showed that the problem of noise is minimized in documents and planning studies. The effect of law changes is possibility of the implementation of housing projects in the near vicinity of the railway area and the approval of the discontinuity of acoustic barriers along the railway tracks.
W artykule poruszono problem zagrożenia hałasem kolejowym w miastach. Aspekt ten jest często marginalizowany w procesie planowania przestrzennego. Na wybranym przykładzie obszaru położonego w dzielnicy Włochy w Warszawie ukazano lokalizację funkcji terenu na tle zmian dopuszczalnych poziomów hałasu. Analiza została oparta o dane z map akustycznych dla Warszawy opracowanych w 2017 r., opracowań planistycznych oraz obecnego stanu zagospodarowania i realizowane inwestycje w granicach obrębu 2-08-10 i 2-08-11. Na podstawie 22 cech powierzchniowych i ilościowych odniesionych do granicznych poziomów dźwięku 50 i 59 dB w nocy oraz 55, 60, 64 i 68 dB w porze dzienno-wieczorowo-nocnej ukazano zmiany w możliwościach zagospodarowania przestrzennego na analizowanym obszarze. Na podstawie wskaźników powierzchniowych opracowanych z wykorzystaniem oprogramowania ArcGis, ukazano mocne i słabe strony badanego terenu. Wykonana analiza jasno pokazała, że zwiększenie dopuszczalnych poziomów dźwięku o 9dB w nocy i 8-9dB w porze dzienno-wieczorowo-nocnej spowodowała zmniejszenie terenów uznawanych za wrażliwe na hałas przed 2012 r. o 71,9-76,3%, oraz zniwelowanie liczby budynków narażonych na hałas o 70-80%. Natomiast analiza zapisów miejscowych planów zagospodarowania przestrzennego oraz Studium Uwarunkowań i Kierunków Zagospodarowania Przestrzennego pokazała, że problem hałasu jest minimalizowany w dokumentach i opracowaniach planistycznych. Efektem tego jest dopuszczanie realizacji inwestycji mieszkaniowych w bliskiej odległości obszaru kolejowego oraz zgoda na nieciągłość ekranów akustycznych wzdłuż torów kolejowych.
Źródło:
Rocznik Ochrona Środowiska; 2019, Tom 21, cz. 2; 1378-1392
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Statistical analysis of gaz-3110 vehicles noise
Autorzy:
Pobedin, A.
Kosov, O.
Dolotov, A.
Domolazov, F.
Powiązania:
https://bibliotekanauki.pl/articles/246122.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
vehicle
statistics
noise sources
dimension
mean-root square dispersion
noise level
regression equation
engine rpm speed
useful life
Opis:
This work presents the results of the statistical analysis of noise in several points of GAZ-3110 vehicles. There are also the dependences between the loudness of noise and speed of an engine or useful life of a car. It is difficult to confuse the noise of jet engine with reciprocating internal-combustion engine. Random factors also influence much the power level. Mechanism adjustment has its limits and so it can have different influence on its vibration and noise. Finally during the process of operation sliding surfaces do wear, screwed connections do loosen, other things happen and these lead to the changes in spectrum and level of noise. In this work we tried to evaluate the dispersion of GAZ-3110 vehicles noise levels according to the results of a coustic measurements in the immediate field of rondom acoustically active constructive assemblies. The range of noise loudness for the specific car model is defined at the level 20-25 dBA. The GAZ-3110 vehicles are characterized by the significant dispersion of noise level. The differences of noise level of individual cars are exceeding 20-25 dBA. vehicles noise considerably increases with the augmentation of useful life and rpm speed. The noisiest element of GAZ-3110 vehicles is internal combustion engine, then main gear even when first gear is operated.
Źródło:
Journal of KONES; 2009, 16, 1; 407-410
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Required attenuation of aircraft noise in buildings in the light of data from the Chopin Airport monitoring
Autorzy:
Rudno-Rudziński, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/128150.pdf
Data publikacji:
2019
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
building acoustics
aircraft noise
permissible noise level in buildings
akustyka budynku
hałas lotniczy
dopuszczalny poziom hałasu w budynkach
Opis:
The minimum attenuations of aircraft noise required by the Polish Standards concerning acoustic insulation and noise levels inside buildings have been compared. Data from the noise monitoring system of the Chopin Airport were used. The minimum attenuation required by PN-B-02151-02:1987 differs from that required by PN-B-02151-3:2015-10. The highest required attenuation occurs when taking into account the maximum sound level LAmax of aircraft noise. The requirements related to LAmax are 2.0 to 7.8 dB higher than those associated with the equivalent sound level LAeq. If the number of flight operations at night reaches the allowed maximum number of forty, the requirements related to LAeq may be decisive. The requirements connected with LAeq according to PN-B-02151-02:1987 are 0.6 to 2.6 dB higher than coming from PN-B-02151-3:2015-10.
Źródło:
Vibrations in Physical Systems; 2019, 30, 1; 1-8
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Noise emission and vibration study of a mista rd-165 fhad grader to reduce environmental harmful impact
Badania hałasu i drgań równiarki mista rd-165 fhad mające na celu zmniejszenie jej szkodliwego wpływu na środowisko
Autorzy:
Kobiałka, Janusz
Barszcz, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/31232978.pdf
Data publikacji:
2023
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
earth moving machine
grader
noise emission
noise level
vibrations
maszyny do robót ziemnych
równiarka
emisja hałasu
poziom hałasu
wibracje
Opis:
Construction machinery noise emission and vibration on the operator site are the most important harmful factors having impact on human health. They affect for people working on the operators and as well as other persons around the machine. The article concerns the issues of noise level and noise emission measurements applied to the earthmoving machinery which are covered by the EU directive 2005/88/EC. The methods of noise testing during design and in the certification, process has been described. The basic information about testing the noise emission to the environment has been presented. Methods and results of vibration tests affecting the operator are also presented. The reference documents and EU standards concerning this topics have been described. The noise testing methods has been presented based on the prototyping and R&D cycle of the Mista RD-165 FHAD grader which is subjected to the European noise limits. The results of noise measurements and sound power level determination has been presented. The testing procedure implemented during two stages of R&D cycle. The article describes the effects of the improvements in the grader focused on noise emission limitation limits.
Hałas emitowany przez maszyny budowlane jest jednym z głównych czynników szkodliwych wpływających na środowisko, a szczególnie na zdrowie osób przebywających w obszarze oddziaływania tych maszyn. Narażonym na hałas poddane są osoby bezpośrednio zaangażowane w pracę, ale również inne osoby znajdujące się w otoczeniu maszyny. Artykuł porusza zagadnienia badania hałasu i drgań miejscowych w maszynach budowlanych podlegających pod dyrektywę Unii Europejskiej 2005/88/WE. Omówione zostały sposoby badania hałasu w trakcie produkcji i certyfikacji maszyn. Przedstawiono podstawowe informacje dotyczące przeprowadzania badań emisji hałasu do otoczenia. Przywołano dokumenty odniesienia i normy badawcze które regulują te badania. Na przykładzie równiarki drogowej Mista RD-165 FHAD, która podlega limitom emisji hałasu, przedstawiono prowadzenie badań podczas prac badawczo-rozwojowych. Przedstawione zostały wyniki pomiarów hałasu i wyznaczona moc akustyczna maszyny. Badania były wykonywane na dwóch etapach prac konstrukcyjnych. W artykule zaprezentowano efekty prac doskonalących konstrukcję pod względem zmniejszenia emisji hałasu do otoczenia.
Źródło:
Technologia i Automatyzacja Montażu; 2023, 2; 50-55
2450-8217
Pojawia się w:
Technologia i Automatyzacja Montażu
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Industrial noise level study in a wheat processing factory in Ilorin, Nigeria
Autorzy:
Ibrahim, I.
Ajao, K. R.
Aremu, S. A.
Powiązania:
https://bibliotekanauki.pl/articles/265416.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
poziom szumów
cyfrowy miernik szumów
hałas
wheat processing
noise level
digital sound meter
questionnaire
hearing protector
Opis:
An industrial process such as wheat processing generates significant noise which can cause adverse effects on workers and the general public. This study assessed the noise level at a wheat processing mill in Ilorin, Nigeria. A portable digital sound level meter HD600 manufactured by Extech Inc., USA was used to determine the noise level around various machines, sections and offices in the factory at pre-determined distances. Subjective assessment was also mode using a World Health Organization (WHO) standard questionnaire to obtain information regarding noise ratings, effect of noise on personnel and noise preventive measures. The result of the study shows that the highest noise of 99.4 dBA was recorded at a pressure blower when compared to other machines. WHO Class-4 hearing protector is recommended for workers on the shop floor and room acoustics should be upgraded to absorb some sounds transmitted to offices.
Źródło:
International Journal of Applied Mechanics and Engineering; 2016, 21, 2; 511-523
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficiency Analysis of Airports in Turkey Considering Environmental Effects
Autorzy:
Ulutas, Berna H.
Powiązania:
https://bibliotekanauki.pl/articles/14475814.pdf
Data publikacji:
2018-03-15
Wydawca:
Wyższa Szkoła Bankowa we Wrocławiu
Tematy:
airport efficiency
data envelopment analysis
undesired outputs
environmental factors
noise level
handicap friendly airport
green airport
Opis:
Aim: This paper aims to attract attention to the “green airport” term that is basically related with environmental legislations. Design / Research methods: A Data Envelopment Analysis (DEA) model is introduced to assess the efficiency of 22 airports in Turkey with the definition of undesirable output as emission values. Conclusions / findings: Results illustrate that only two airports are efficient based on the considered outputs and undesirable output. Originality / value of the article: Up-to-best knowledge, green gas emission data of airports in Turkey are considered in a DEA model for the first time. To minimize the undesirable output, it is considered as a desirable input in the model. Results are expected to support official authorities during decision making.Limitations of the study: Data for noise levels and the exposed area and/or number of exposed people and buildings were not available for the airports in concern.
Źródło:
Central European Review of Economics and Management; 2018, 2, 1; 65-78
2543-9472
Pojawia się w:
Central European Review of Economics and Management
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Earplug Actuator Selection for a Miniature Personal Active Hearing Protection System
Autorzy:
Pawełczyk, M.
Latos, M.
Powiązania:
https://bibliotekanauki.pl/articles/178052.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
active noise control
fixed-parameter control
high-level noise
nonstationary noise
feedforward control
earplug
hearing protection
Opis:
There are many industrial environments which are exposed to a high-level noise. It is necessary to protect people from the noise. Most of the time, the consumer requires a miniature version of a noise canceller to satisfy the internal working place requirements. Very important thing is to select the most appropriate personal hearing protection device, for example an earplug. It should guarantee high passive noise attenuation and allow for secondary sound generation in case of active control. In many cases the noise is nonstationary. For instance, some of the noisy devices are switched on and off, speed of some rotors or fans changes, etc. To avoid any severe transient acoustic effects due to potential convergence problems of adaptive systems, a fixed-parameter approach to control is appreciated. If the noise were stationary, it would be possible to design an optimal control filter minimising variance of the signal being the effect of the acoustic noise and the secondary sound interference. Because of noise nonstationarity for most applications, the idea of generalised disturbance defined by a frequency window of different types has been developed by the authors and announced in previous publications. The aim of this paper is to apply such an approach to different earplugs and verify its noise reduction properties. Simulation experiments are conducted based on real world measurements performed using the G.R.A.S. artificial head equipped with an artificial mechanical ear, and the noise recorded in a power plant.
Źródło:
Archives of Acoustics; 2010, 35, 2; 213-222
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 45

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies