The Open Civil Engineering Journal


ISSN: 1874-1495 ― Volume 11, 2017
RESEARCH ARTICLE

Analysis of the Vibration Isolation Effect of the Railway Rigid Sandwich Wall



Sun Chenglong1, 2, *, Gao Liang1
1 School of Civil Engineering, Beijing Jiaotong University, Beijing100044, China
2 Energy Saving & Environmental Protection & Occupational Safety and Health Research Institute, China Academy of Railway Sciences, Beijing 100081, China

Abstract

The vibration isolation effect of the rigid sandwich wall was measured and the characteristics of time and frequency domain at low frequency was analyzed on the basis of the environmental isolation engineering of the railway in the Beijing suburb in this paper. The results indicated that environmental vibration significantly decreased after building the rigid sandwich walls. The vibration isolation efficiency of the rigid sandwich wall is respectively 0.32 and 0.46 at a distance of 35 meters and 40 meters away from railway center. It is obvious that a distance of 5 meters behind the vibration isolation barrier shows a more obvious vibration isolation effect than 10 meters. The vibration isolation barrier has an obvious effect in middle-high frequency (10~80 Hz) of the vibration, especially formed by sleeper spacing action rate (22.7 Hz). In addition, the effect is not obvious with a frequency below 10 Hz, such as the low frequency vibration formed by the moving axle load (7 Hz). In this paper, a vibration model of the earth-rigid sandwich wall was established. It also studied the effect of width, depth and position of the barrier on the vibration isolation, and provided the application condition and the setting requirement of key parameters for the rigid sandwich wall. These results provided the technical support for controlling projects of environmental vibration with rigid sandwich walls.

Keywords: Railway, The rigid sandwich wall, Vibration isolation barrier, Environmental vibration, Vibration isolation effect.


Article Information


Identifiers and Pagination:

Year: 2017
Volume: 11
First Page: 121
Last Page: 130
Publisher Id: TOCIEJ-11-121
DOI: 10.2174/1874149501711010121

Article History:

Received Date: 05/8/2016
Revision Received Date: 04/11/2016
Acceptance Date: 13/11/2016
Electronic publication date: 24/02/2017
Collection year: 2017

Article Metrics:

CrossRef Citations:
0

Total Statistics:

Full-Text HTML Views: 73
Abstract HTML Views: 72
PDF Downloads: 46
ePub Downloads: 81
Total Views/Downloads: 272

Unique Statistics:

Full-Text HTML Views: 50
Abstract HTML Views: 42
PDF Downloads: 42
ePub Downloads: 56
Total Views/Downloads: 190
Geographical View

© 2017 Chenglong and Liang

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


* Address correspondence to this author at the Energy Saving & Environmental Protection & Occupational Safety and Health Research Institute, China Academy of Railway Sciences, Beijing 100081, China; Tel: +86 1061893406; Fax: +86 105189312; E-mail: sun2119@162.com




1. INTRODUCTION

In recent years, with the further development of high speed and heavy load railway, the negative impact of environmental vibration has become prominent increasingly. The complaints about environmental vibration of the railway have increased especially in the existing main railway lines. At present, there are three ways of railway vibration reduction at home and abroad, respectively at vibration sources, at the route of transmission path and using the protected body. Then, the vibration isolation at the source is one of the most common and effective methods that generally improve the track structure and the railway vehicle bogie to reduce the contact force between wheel and track. The abovementioned method is mainly used in the new, reconstruction and expansion projects of the railway. When the vibration attenuation measures still can’t meet the requirements, or environmental vibration exceeds the standard on the existing railway without reconstruction and expansion, setting the vibration isolation barrier on the vibration propagation path is one of the effective measures.

The railway vibration isolation barrier mainly includes the continuous vibration isolation barrier (isolation ditch, wall) and the non-continuous vibration isolation barrier (pile). Railway rigid sandwich wall is a kind of filling ditch which uses the larger impedance between different medium to reduce the vibration transmission. At present, the domestic and foreign scholars mainly study the railway vibration isolation ditch (wall) in theory. Foreign scholars, such as Yang. B and Hung. H [1Y. Yang, and H. Hung, "A parametric study of wave barriers for reduction of train-induced vibrations", International Journal for Numerical Methods in Engineering, vol. 40, pp. 3729-3747, 1997.], L. Andersen and S. R. K. Nielsen [2L. Andersen, and S. Nielsen, "Reduction of ground vibration by means of barriers or soil improvement along a railway track", Soil Dynamics and Earthquake Engineering, vol. 25, pp. 701-716, 2005.
[http://dx.doi.org/10.1016/j.soildyn.2005.04.007]
], Michele Buonsanti [3M. Buonsanti, F. Cirianni, G. Leonardi, A. Santini, and F. Scopelliti, "Mitigation of railway traffic induced vibrations: the influence of barriers in elastic half-space", Advances in Acoustics and Vibration, vol. 2009, pp. 1-7, 2009.], Takemiya. H [4H. Takemiya, "Field vibration mitigation by honeycomb WIB for pile foundations of a high-speed train viaduct", Soil Dynamics and Earthquake Engineering, vol. 24, pp. 69-87, 2004.
[http://dx.doi.org/10.1016/j.soildyn.2003.07.005]
], and Domestic scholars, such as Liu [5F. Liu, J. Liu, J. Fang, and D. Guo, "Numerical analysis of the vibration isolation effect of the railway vibration isolating cutting in permafrost", Journal China Railway Science, vol. 5, pp. 49-52, 2003.], Zhai [6Z.-X. He, W.-M. Zhai, X.-W. Yang, and X.-C. Chen, "Moving train axle-load induced ground vibration and mitigation", Journal of Railway Science and Engineering, vol. 4, no. 5, pp. 73-77, 2007.], Luo and Lei [7L. Kun, and X. Lei, "Numerical analysis of railway vibration isolation of new style trenches", Journal of Noise and Vibration Control, vol. 2, no. 1, pp. 67-71, 2012.], established the numerical model by using the finite element method and the boundary element method to study the effect and rules of the vibration isolation barrier. The research results show that the good vibration isolation effect can be achieved when the vibration isolation barrier has a certain depth. In Switzerland, Germany and Japan, the vibration isolation trench test shows [8B. Schulte-Werning, D. Thompson, P. Gautier, C. Hanson, B. Hemsworth, J. Nelson, T. Maeda, P. de Vos, and R. Müller, "Mitigation measures for open lines against vibration and ground-borne noise: a swiss overview", In: Noise and Vibration Mitigation for Rail Transportation Systems, Springer-Verlag Berlin Heidelberg, 2008, pp. 264-270.] when the depth of trench is 3~5m, the vibration isolation effect reaches 5dB in low frequency (6Hz~8Hz) in some of the test points around the railway.

The vibration isolation effect of rigid sandwich wall under typical conditions was measured through the field test of the ring railway in the Beijing eastern suburb. Moreover, the earth-isolation barrier vibration simulation model was established to analyze influence of the width, depth and location of isolation barrier theoretically and put forward the application condition and the key parameters’ requirements of rigid sandwich wall. The research results provide the technical support for the engineering of railway environmental vibration with rigid sandwich wall.

2. VIBRATION ISOLATION TEST OF THE RIGID SANDWICH WALL

Combining the rigid sandwich wall isolation engineering of the ring railway in the Beijing eastern suburb implemented by the China railway academy of sciences, the field vibration isolation test of rigid sandwich wall is carried out. The vibration response of the ground and the vibration isolation effect of the rigid sandwich wall are analyzed.

2.1. Test Condition

The vibration reduction effect of the rigid sandwich wall was tested on the direct method on the ring railway in the Beijing eastern suburb.

There are some parameters of the rigid sandwich wall. The depth is 8 m and the width is 4 m. The wall is made of C15 plain concrete, and the sandwich material is made of 0.6-metre-thick foam styrene. The concrete cover plate which is 0.2 m thick is set at the top of the foamed styrene, pouring into a whole with both sides of the concrete wall. The train with harmonious locomotive and four marshaling moves at speed of 50 km/h.

2.2. Arrangement of Measuring Points

Four measuring points are arranged in the vertical direction of the railway. One of them is 15 m away from the railway as well as in front of the vibration isolation barrier and two points are apart from the railway 35 m behind the vibration isolation barrier, and last point is set on the vibration isolation barrier to test the change of vibration response after setting the vibration isolation barrier. The arrangement of measuring points is shown in Fig. (1). The field sampling frequency is 512 Hz. There are some field test facilities including the vibration pickup, the signal amplifier, the data acquisition instrument and the computer storage and analysis software. Table 1 shows key technical indexes of the vibration pickup and Fig. (2) shows field test facilities.

Fig. (1)
Schematic diagram of measuring point layout of environmental vibration.


Fig. (2)
Pictures of field test facilities.


Table 1
The key technical indexes of the vibration pickup.


2.3. Analysis Index

According to the Urban Regional Environmental Vibration Standards (GB10070-88) [9State Environmental Protection Administration of China, GB10070-88urban Regional Environmental Vibration Standards., Standards Press of China, 1989.] and Urban Regional Environmental Vibration Measurement Method (GB10071-88) [10State Environmental Protection Administration of China, GB10071-88urban Regional Environmental Vibration Measurement Method., Standards Press of China, 1989.], the vertical Z vibration level VLzmax is used to evaluate the environmental vibration caused by rail transit and the acceleration amplitude attenuation coefficient is used to evaluate the vibration isolation efficiency of the vibration isolation barrier. is expressed as, where is the vertical acceleration amplitude of the observation point in the shield area after setting the vibration isolation barrier and is the vertical acceleration amplitude of the observation point before setting the vibration isolation barrier.

Fig. (3)
Z vibration level time history diagram before and after setting rigid sandwich.


2.4. Analysis of Vibration Isolation Effect

2.4.1. Analysis of Vertical Z Vibration Level

The vibration reduction effect of the rigid sandwich wall at the measuring point V3 and V4 is shown in Fig. (3) when the train passes. The Fig. (3) shows that the vibration level of the isolated area obviously decreased after setting the rigid sandwich wall. The vibration attenuation of Z vibration level is 6.0~12.0 dB and the average attenuation amount is 9.0 dB at a distance of 35 m away from the railway center. The vibration attenuation of Z vibration level is 3.7~8.2 dB and the average attenuation amount is 5.7 dB at a distance of 40 m away from the railway center. Obviously, the vibration isolation effect of 5 m away from the barrier is better than that of 10 m.

The maximum value VLzmax of the vertical Z vibration level is shown in Fig. (4) before and after setting the rigid sandwich wall. The Fig. (4) shows that the maximum value of the vertical Z behind the barrier decreased rapidly after setting the rigid sandwich wall. The maximum value of the vertical Z vibration level can be reduced to 7.3 dB at a distance of 35 m away from the railway center and to 4.8 dB at a distance of 40 m away from railway center. Due to the limitation of the depth and length of the isolation barrier, the vibration wave with longer wavelength is transmitted to the rear of the vibration isolation barrier by diffraction. There is an obvious shielding area behind the vibration isolation barrier. The closer the distance barrier, the stronger the effect of shielding vibration wave. Therefore, to ensure that the barrier has the appropriate length and width so as to reduce the diffraction of the ground vibration wave.

Fig. (4)
Comparison of the vibration level before and after the rigid sandwich wall.


2.4.2. Analysis of Vibration Isolation Efficiency

According to the test results, the effective values of the acceleration at 35 m and 40 m before and after setting the vibration isolation barrier are shown in Table 2. As shown in the table, the acceleration amplitude attenuation coefficient at the point of 35 m was 0.32 and is 0.46 at the point of 40 m. The vibration isolation effect of 40 m is lower than that of 35 m.

Table 2
Effective values of environmental vibration acceleration (unit: m/s-2).


2.5.1/3. Frequency Doubling Analysis of Vibration Isolation Effect

In order to study the vibration isolation effect of the rigid sandwich wall at different frequencies, the acceleration response of 29 m, 35 m and 40 m apart from the railway is analyzed by 1/3 double frequency, 1/3 frequency doubling spectrum is shown in Fig. (5). As shown in the figure, when the frequency is less than 8 Hz, the vibration level curve of the vibration isolation barrier is almost coincident. That is, there is no vibration isolation effect. When the frequency is in the range of 8~80 Hz, the vibration isolation effect of the sandwich wall begins to appear and shows a trend of increasing with the increase of frequency. The results show that the vibration isolation effect of the rigid sandwich wall is not obvious in the low frequency band, but it has good vibration isolation effect in the middle and high frequency segments.

Fig. (5)
1/3 double frequency spectra of rigid sandwich wall.


Before the rigid wall is set up, the energy of the ambient vibration is mainly distributed in the frequency range of 8~31.5 Hz, which reaches the peak at the frequency of 25 Hz. After the rigid wall is set up, the vibration of over 8 Hz is rapidly attenuated (attenuation is 4.0~10.8 dB at 35 m, and is 6.9~16.2 dB at 40 m).

3. PARAMETER OPTIMIZATION DESIGN OF THE RIGID SANDWICH WALL

Due to the limitations of the test conditions, the influence of the depth, width and the position of the vibration isolation barrier on the vibration response of the ground observation point is simulated through establishment of Earth-rigid sandwich wall finite element model in ANSYS finite element software. Then the vibration isolation effect under different conditions is analyzed to obtain the optimal combination of design parameters.

3.1. Finite Element Model of Rigid Sandwich Wall

Main geological parameters of railway environment are shown in Table 3.

Table 3
Geological parameters.


The rigid sandwich wall is continuous barrier, which can be calculated according to the plane model whose length is 120 m and width is 100 m. The finite element model adopts plane 42 element and meshing grid length is 1 m. The right boundary, the bottom boundary and the left boundary of the model are all made of viscoelastic artificial boundary so as to simulate infinite foundation. The coupled dynamic analysis model of the earth-rigid sandwich wall is shown in Fig. (6).

Fig. (6)
The model of rigid sandwich wall.


3.2. The Model Verification

The speed of train is 13.6 km/h based on the actual measurement. The vertical acceleration of earth at a distance of 28 m from the center line of railway is selected to demonstrate the validity of the software. Figs. (7 and 8) show earth vertical acceleration time history curve according to the numerical simulation and the actual measurement respectively. The results show the magnitude of the simulation data is the accordant with the test data and the maximal amplitude is about 0.0015 g. Table 4 shows the maximum value VLzmax of the vertical Z vibration level in the condition of different distance away from the railway. The comparison result shows the maximum Z vibration level measured is in good agreement with the simulation data.

Fig. (7)
The simulation data of earth vertical acceleration time history at a distance of 28.8 m from the center line of railway.


Fig. (8)
The test data of earth vertical acceleration time history at a distance of 28.8 m from the center line of railway.


Table 4
Maximum value VLzmax at a different distance to the center line of railway.


Above all, according to the comparison of the acceleration time history based on the simulation data and test data which the barrier is separately located in the 28.8 m from the center line of railway and other distance, the model is effective. The model is used to simulate the effect of the vibration attenuation in different conditions.

3.3. Analysis of Key Parameters

3.3.1. The Influence of the Depth of Rigid Sandwich Wall

The width of the sandwich wall is 4 m and the thickness of the sandwich layer is 0.6 m, which is set at 26 m away from the railway. Considering three kinds of working conditions, the depth of the core wall is respectively 4 m, 8 m and 16 m. Comparison of vibration level of the sandwich wall with different depth is shown in Fig. (9). As shown in the figure, the vibration isolation effect of the sandwich wall whose depth is 8m is almost the same with that the depth is 4 m. It is shown that the depth of the sandwich wall only increases in a certain range and the effect of the vibration reduction is obvious. Moreover, selecting the depth of the rigid sandwich wall should consider the factors such as the cost and construction.

Fig. (9)
Comparison of vibration level of sandwich wall with different depth.


3.3.2. The Influence of the Width of the Rigid Sandwich Wall

The depth of the sandwich wall is 8 m and the thickness of the sandwich layer is 0.6 m, which is set at 26 m away from the railway. Considering two kinds of working conditions, the width of the core wall is respectively 4 m and 2 m. Comparison of vibration level of sandwich wall with different width is shown in Fig. (10). As shown in the figure, the difference of the vibration reduction is small. Therefore, the increase of vibration reduction effect is not obvious with the increase of the width of the sandwich wall. And the cost of the project would increase exponentially and the area would increase with the increases of the width of the rigid sandwich wall. So the width of the rigid sandwich wall should be decided firstly before considering other key factors to achieve the ideal isolation effect of the barrier.

Fig. (10)
Comparison of vibration level of sandwich wall with different width.


3.3.3. The Influence of the Position of Rigid Sandwich Wall

The depth of the sandwich wall is 8 m, the width of the sandwich wall is 4 m and the thickness of the sandwich layer is 0.6 m. Considering two kinds of working conditions, the position of the core wall is separately 16 m and 26 m apart from the railway. Comparison of vibration level of the sandwich wall with different position is shown in Fig. (11). As shown in Fig. (11), the vibration isolation effect which the rigid sandwich wall is located in the 26 m is better than that is located in the 16 m at a distance of 30 m~45 m from the railway; the vibration isolation effect which the rigid sandwich wall is located in the 16 m is better than that is located in the 26 m at a distance of 45 m~80 m from the railway. Obviously, the effect of position of the rigid sandwich wall on the vibration isolation is not stable. The closer the position of the rigid core sandwich wall to the protected body is the better the damping effect.

Fig. (11)
Comparison of vibration level of sandwich wall with different position.


CONCLUSION

The vibration isolation effect of the rigid sandwich wall was measured under typical operating conditions and the influence of the parameters of the rigid sandwich wall on the vibration isolation effect was analyzed. The conclusions are drawn as follows:

  1. The vibration level of the isolated area is obviously decreased after setting the rigid sandwich wall. The vibration attenuation of Z vibration level is 6.0~12.0 dB, the average attenuation amount is 9.0 dB at a distance of 35 m from the railway center. The vibration attenuation of Z vibration level is 3.7~8.2 dB and the average attenuation amount is 5.7 dB at a distance of 40 m from the railway center.
  2. When the frequency is less than 8 Hz, the vibration level curve of the vibration isolation barrier is almost coincident whether there is the vibration isolation barrier. That is, there is no vibration isolation effect. When the frequency is in the range of 8~80 Hz, the vibration isolation effect of the sandwich wall begins to appear and shows a trend of increasing with the increase of frequency. The results show that the vibration isolation effect of the rigid sandwich wall is not obvious in the low frequency band, but it has good vibration isolation effect in the middle and high frequency segments.
  3. The depth of the sandwich wall only increases in a certain range and the effect of the vibration reduction is obvious. Moreover, selecting the depth of the rigid sandwich wall should consider the factors such as the cost and construction.
  4. The increase of vibration reduction effect is not obvious with the increase of the width of the sandwich wall. And the cost of the project will increase exponentially and the area will increase with the increases of the width of the rigid sandwich wall. The width of the rigid sandwich wall should be decided firstly before considering other key factors so as to achieve the ideal isolation effect of the barrier.
  5. Obviously, the effect of the position of the rigid sandwich wall on the vibration isolation is not stable. The closer the position of the rigid core sandwich wall to the protected body, the better is the damping effect.

CONFLICT OF INTEREST

The authors confirm that this article content has no conflict of interest.

ACKNOWLEDGEMENTS

The authors would like to acknowledge the support provided by the Chinese National Science Foundation (Grant No. 51478004). Meanwhile, the financial support from North China University of Technology is also appreciated.

REFERENCES

[1] Y. Yang, and H. Hung, "A parametric study of wave barriers for reduction of train-induced vibrations", International Journal for Numerical Methods in Engineering, vol. 40, pp. 3729-3747, 1997.
[2] L. Andersen, and S. Nielsen, "Reduction of ground vibration by means of barriers or soil improvement along a railway track", Soil Dynamics and Earthquake Engineering, vol. 25, pp. 701-716, 2005.
[http://dx.doi.org/10.1016/j.soildyn.2005.04.007]
[3] M. Buonsanti, F. Cirianni, G. Leonardi, A. Santini, and F. Scopelliti, "Mitigation of railway traffic induced vibrations: the influence of barriers in elastic half-space", Advances in Acoustics and Vibration, vol. 2009, pp. 1-7, 2009.
[4] H. Takemiya, "Field vibration mitigation by honeycomb WIB for pile foundations of a high-speed train viaduct", Soil Dynamics and Earthquake Engineering, vol. 24, pp. 69-87, 2004.
[http://dx.doi.org/10.1016/j.soildyn.2003.07.005]
[5] F. Liu, J. Liu, J. Fang, and D. Guo, "Numerical analysis of the vibration isolation effect of the railway vibration isolating cutting in permafrost", Journal China Railway Science, vol. 5, pp. 49-52, 2003.
[6] Z.-X. He, W.-M. Zhai, X.-W. Yang, and X.-C. Chen, "Moving train axle-load induced ground vibration and mitigation", Journal of Railway Science and Engineering, vol. 4, no. 5, pp. 73-77, 2007.
[7] L. Kun, and X. Lei, "Numerical analysis of railway vibration isolation of new style trenches", Journal of Noise and Vibration Control, vol. 2, no. 1, pp. 67-71, 2012.
[8] B. Schulte-Werning, D. Thompson, P. Gautier, C. Hanson, B. Hemsworth, J. Nelson, T. Maeda, P. de Vos, and R. Müller, "Mitigation measures for open lines against vibration and ground-borne noise: a swiss overview", In: Noise and Vibration Mitigation for Rail Transportation Systems, Springer-Verlag Berlin Heidelberg, 2008, pp. 264-270.
[9] State Environmental Protection Administration of China, GB10070-88urban Regional Environmental Vibration Standards., Standards Press of China, 1989.
[10] State Environmental Protection Administration of China, GB10071-88urban Regional Environmental Vibration Measurement Method., Standards Press of China, 1989.

Endorsements



"Open access will revolutionize 21st century knowledge work and accelerate the diffusion of ideas and evidence that support just in time learning and the evolution of thinking in a number of disciplines."


Daniel Pesut
(Indiana University School of Nursing, USA)

"It is important that students and researchers from all over the world can have easy access to relevant, high-standard and timely scientific information. This is exactly what Open Access Journals provide and this is the reason why I support this endeavor."


Jacques Descotes
(Centre Antipoison-Centre de Pharmacovigilance, France)

"Publishing research articles is the key for future scientific progress. Open Access publishing is therefore of utmost importance for wider dissemination of information, and will help serving the best interest of the scientific community."


Patrice Talaga
(UCB S.A., Belgium)

"Open access journals are a novel concept in the medical literature. They offer accessible information to a wide variety of individuals, including physicians, medical students, clinical investigators, and the general public. They are an outstanding source of medical and scientific information."


Jeffrey M. Weinberg
(St. Luke's-Roosevelt Hospital Center, USA)

"Open access journals are extremely useful for graduate students, investigators and all other interested persons to read important scientific articles and subscribe scientific journals. Indeed, the research articles span a wide range of area and of high quality. This is specially a must for researchers belonging to institutions with limited library facility and funding to subscribe scientific journals."


Debomoy K. Lahiri
(Indiana University School of Medicine, USA)

"Open access journals represent a major break-through in publishing. They provide easy access to the latest research on a wide variety of issues. Relevant and timely articles are made available in a fraction of the time taken by more conventional publishers. Articles are of uniformly high quality and written by the world's leading authorities."


Robert Looney
(Naval Postgraduate School, USA)

"Open access journals have transformed the way scientific data is published and disseminated: particularly, whilst ensuring a high quality standard and transparency in the editorial process, they have increased the access to the scientific literature by those researchers that have limited library support or that are working on small budgets."


Richard Reithinger
(Westat, USA)

"Not only do open access journals greatly improve the access to high quality information for scientists in the developing world, it also provides extra exposure for our papers."


J. Ferwerda
(University of Oxford, UK)

"Open Access 'Chemistry' Journals allow the dissemination of knowledge at your finger tips without paying for the scientific content."


Sean L. Kitson
(Almac Sciences, Northern Ireland)

"In principle, all scientific journals should have open access, as should be science itself. Open access journals are very helpful for students, researchers and the general public including people from institutions which do not have library or cannot afford to subscribe scientific journals. The articles are high standard and cover a wide area."


Hubert Wolterbeek
(Delft University of Technology, The Netherlands)

"The widest possible diffusion of information is critical for the advancement of science. In this perspective, open access journals are instrumental in fostering researches and achievements."


Alessandro Laviano
(Sapienza - University of Rome, Italy)

"Open access journals are very useful for all scientists as they can have quick information in the different fields of science."


Philippe Hernigou
(Paris University, France)

"There are many scientists who can not afford the rather expensive subscriptions to scientific journals. Open access journals offer a good alternative for free access to good quality scientific information."


Fidel Toldrá
(Instituto de Agroquimica y Tecnologia de Alimentos, Spain)

"Open access journals have become a fundamental tool for students, researchers, patients and the general public. Many people from institutions which do not have library or cannot afford to subscribe scientific journals benefit of them on a daily basis. The articles are among the best and cover most scientific areas."


M. Bendandi
(University Clinic of Navarre, Spain)

"These journals provide researchers with a platform for rapid, open access scientific communication. The articles are of high quality and broad scope."


Peter Chiba
(University of Vienna, Austria)

"Open access journals are probably one of the most important contributions to promote and diffuse science worldwide."


Jaime Sampaio
(University of Trás-os-Montes e Alto Douro, Portugal)

"Open access journals make up a new and rather revolutionary way to scientific publication. This option opens several quite interesting possibilities to disseminate openly and freely new knowledge and even to facilitate interpersonal communication among scientists."


Eduardo A. Castro
(INIFTA, Argentina)

"Open access journals are freely available online throughout the world, for you to read, download, copy, distribute, and use. The articles published in the open access journals are high quality and cover a wide range of fields."


Kenji Hashimoto
(Chiba University, Japan)

"Open Access journals offer an innovative and efficient way of publication for academics and professionals in a wide range of disciplines. The papers published are of high quality after rigorous peer review and they are Indexed in: major international databases. I read Open Access journals to keep abreast of the recent development in my field of study."


Daniel Shek
(Chinese University of Hong Kong, Hong Kong)

"It is a modern trend for publishers to establish open access journals. Researchers, faculty members, and students will be greatly benefited by the new journals of Bentham Science Publishers Ltd. in this category."


Jih Ru Hwu
(National Central University, Taiwan)


Browse Contents


Webmaster Contact: info@benthamopen.com
Copyright © 2017 Bentham Open