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Found 6289 publications

Vibration analysis of a suspension system subject to high level of measurement noise

Gabor Rodonyi György Istenes Ferenc Szauter

Publication Name: 2017 4th International Conference on Control Decision and Information Technologies Codit 2017

Publication Date: 2017-11-08

Volume: 2017-January

Issue: Unknown

Page Range: 881-886

Description:

Using only vertical acceleration measurements for the sprung and unsprung masses of a suspension system of a commercial city bus, the goal of the paper is to develop an analysis method to find the vibration modes of the mechanical system from data measured during real life operation. The identified vibration modes can be used to (in)validate first principle physical models of the system, while the identified ARMA models can be used to develop uncertainty models. The challenge in the problem is that the measurements are subject to very high level of noise due to maneuvering of the vehicle, nonlinear effects of the suspension system, vibration of the engine and the gear system, and sensor noise. Nonparametric and parametric modeling methods are applied to evaluate the quality of the measurements and find the invariant properties of the suspension system. It is shown based on multiple experiments that independently of the actual road properties and operating conditions, eigen-frequencies of some vibration modes can be determined with relatively small uncertainty, while the corresponding damping factors have varying amount of uncertainty. Comparing the results with the modes of a full car vehicle model developed based on physical considerations, it can be concluded that an identification algorithm for obtaining the parameters of the physical model must be complemented with a suitable uncertainty modeling and classification.

Open Access: Yes

DOI: 10.1109/CoDIT.2017.8102707

Entropy based fuzzy classification and detection aid for colorectal polyps

Ferenc Lilik L. T. Kóczy Szilvia Nagy

Publication Name: 2017 IEEE AFRICON Science Technology and Innovation for Africa AFRICON 2017

Publication Date: 2017-11-03

Volume: Unknown

Issue: Unknown

Page Range: 78-82

Description:

Colorectal polyps affect a large percentage of the population all over the world, and they can be a basis for more serious conditions such as cancers. As the most reliable method for detecting a polyp in the lower bowel tract is colonoscopy, more and more image processing experiments appear that help to find or characterize such a lesion. The social benefit of such methods is clear, any aid in detecting pre-cancer states saves lives. In the present considerations a fuzzy decision method for finding polyps on a colonoscopy image is presented. As a first step, the image taken during the colonoscopy is cut into tiles of size N by N, thus a rough localization of the lesion within the picture is also possible. The antecedent dimensions consist of statistical characteristics of the colour channels of the tiles, their Renyi entropies, edge density and fitted polynomial coefficients. The method's dependence on the tile-size within the images are also studied, and the success rate increases with the decrease of the tile size between 70 by 70 and 20 by 20 tile sizes.

Open Access: Yes

DOI: 10.1109/AFRCON.2017.8095459

Automatic ELM detection using gSPRT on the COMPASS tokamak

M. Berta M. Szutyányi M. Hron R. Pánek A. Bencze

Publication Name: Fusion Engineering and Design

Publication Date: 2017-11-01

Volume: 123

Issue: Unknown

Page Range: 950-954

Description:

This paper contains the description of the generalized Sequential Probability Ratio Test (gSPRT) method used for automatic ELM detection in different diagnostic signals collected on the COMPASS tokamak. After determination of H-mode region based on Dα signal in a given shot, ELMs are automatically detected in different diagnostic time traces (e.g. magnetic signals and also in Dα signals). The onset time, the maximum location and the peak value, and the duration of each detected ELM is determined. Analyzed diagnostic signals came from different radial positions of the studied plasma volume, thus from arrival times of given ELM into different detectors, the average radial propagation velocity of the ELM event can be also estimated. Comparison of results from gSPRT method with two different, commonly used automatic ELM detection method (threshold technique and correlation based technique) is also reported.

Open Access: Yes

DOI: 10.1016/j.fusengdes.2017.03.025

Factors affecting the quality of raw sheep and goat milk

Székelyhidi Rita

Publication Name: Magyar Allatorvosok Lapja

Publication Date: 2017-11-01

Volume: 139

Issue: 11

Page Range: 687-696

Description:

Based on large number of publications in scientific literature, the author provide information on the factors affecting the quality of raw sheep and goat milk. She presents the effect of the variety within species, the impact of stage of lactation and seasons, the influence of milking and changes in somatic cell count in milk composition. In sheep milk the amount of milk fat, milk protein and casein in the final stage of the lactation rises compared to the first stage. In goat milk the concentration of milk fat decreases in the middle stage of lactation compared to the first stage and it increases in the final stage and the amount of milk protein and casein constantly increases during the lactation. High milk yield is usually combined with a long lactation period, normally 8-10 months, but the dairy sheep maintain lactation for 2 years without more calving. A high somatic cell count milk have a higher proteolytic activity, and they contain larger quantities of fat and casein and lower concentration of whey proteins, especially serum albumin and immunoglobulin. The proteolytic enzymes in the somatic cells attack the as2- and β-casein. Just like the goats, the sheep also respond to changes in the environment, they have developed a genetic multiplication pace that follows the seasons change and the better food endowments. If the lactation period begins before the spring or the rainy season, lactation period will be longer because of the better feed. There is 80-90% correspondence between the udder size and the milk yield, and the milk yield depends on the surface size of alveoli, too. Increasing the number of milking ordinarily increases the amount of the expressed milk, but in this case there are significant differences between individual animals.

Open Access: Yes

DOI: DOI not available

Application of laser-based photoacoustic spectroscopy and colorimetry for quantification of anthocyanin in hard boiled candy

Mihály Kovács Zsolt Ajtony Ottó Dóka Dane Bicanic

Publication Name: Microchemical Journal

Publication Date: 2017-11-01

Volume: 135

Issue: Unknown

Page Range: 100-104

Description:

The analytical performance of the newly proposed laser-based photoacoustic spectroscopy (LPAS) and colorimetric method for quantification of anthocyanin (E163) in commercially available hard boiled candies are compared to that of the spectrophotometry (SP). Both LPAS and colorimetry are direct methods that unlike SP do not require the extraction of the analyte or some additional sample treatment. Results indicate that LPAS and colorimetry are both suitable for quickly screening content of anthocyanin in hard boiled candies. The correlation between the two methods and spectrophotometry is linear with R2 = 0.9989 for LPAS and R2 = 0.9570 for colorimetry.

Open Access: Yes

DOI: 10.1016/j.microc.2017.08.013

Effect of genetic and nongenetic factors on chemical composition of individual milk samples from dromedary camels (Camelus dromedarius) under intensive management

P. Nagy J. Reiczigel Zs N. Fábri J. Juhász László Varga

Publication Name: Journal of Dairy Science

Publication Date: 2017-11-01

Volume: 100

Issue: 11

Page Range: 8680-8693

Description:

The aims of the present study were to monitor the changes in gross chemical composition of individual dromedary camel milk over a 5-yr period, to provide reference values, and to determine the effect of genetic and nongenetic factors influencing camel milk composition under intensive management. A total of 1,528 lactating dromedary camels were included in the study. Animals were fed a constant diet and were milked twice a day in a herringbone parlor. Milk samples were collected at monthly intervals using a sampling device and then fat, protein, lactose, total solids (TS), and solids-nonfat (SNF) concentrations of raw camel milk were determined with an automatic milk analyzer. For each milk sample, production parameters were recorded and quantities (grams) of milk constituents were calculated. The overall mean quantity and fat, protein, lactose, SNF, and TS concentrations of the morning milk were 4.0 kg, 2.58%, 2.95%, 4.19%, 8.08%, and 10.46%, respectively. Milk quantity showed a positive correlation with lactose and a negative correlation with all other components. Parity exerted a strong effect on all milk parameters. Primiparous dromedaries (n = 60) produced less milk with higher concentrations of components than did multiparous animals (n = 1,468). Milk composition varied among the 7 breeds tested, but none of the genotypes was found to be superior to the others in this respect. We detected a significant, yet small calf sex-biased difference in milk yield and composition. Stage of lactation and season strongly influenced milk yield and all milk components. We also found a significant interaction between month postpartum (mPP) and month of the year. The concentration of all milk components decreased from 1 to 5 mPP. Later, lactose concentration and quantity continued to decrease parallel with decreasing milk production. The concentration of other components showed a temporary increase in mid lactation, from 6 to 11 mPP, and in late lactation, from 18 to 23 mPP. Mean fat, protein, SNF, and TS concentrations showed a high seasonal variation (9.5 to 28.7%), with the lowest and highest values being measured during summer and winter, respectively. This seasonal variation was independent of nutrition and may reflect an endogenous circannual rhythm. We observed a noticeable variation among years. Dromedary camels could provide a useful in vivo model to study the homeorhetic regulation of mammary cell function by endogenous and environmental factors.

Open Access: Yes

DOI: 10.3168/jds.2017-12814

Breakage test of railway ballast materials with new laboratory method

Szabolcs Fischer

Publication Name: Periodica Polytechnica Civil Engineering

Publication Date: 2017-10-24

Volume: 61

Issue: 4

Page Range: 794-802

Description:

This paper summarizes the results of a R&D work in 2014. Five different types of andesite railway ballast material with different LARB (%) (Los Angeles abrasion) as well as MDERB (%) (Micro-Deval abrasion) values were investigated in laboratory with pulsating test which models the real condition much better (the used parameters were determined accordance with international dynamic design method). Grain size distributions related to the five several aggregates were defined before and after pulsating tests. Particle breakages were then calculated by different method publicized in international literature. Relationships were searched between particle breakages due to laboratory test and LARB (%) as well as MDERB (%) values of railway ballast samples. Time interval (cycle) of ballast cleaning work were attempted to compute with help of special parameters used by Hungarian and other railway companies underlined the limits of calculation method. Finally recommendations were formulated related to use of this new laboratory test method for estimation of ballast particle breakage.

Open Access: Yes

DOI: 10.3311/PPci.8549

Diagnostic measurement and data evaluation for the effective performance of motor vehicles with free acceleration

István Lakatos Péter Ori

Publication Name: Sisy 2017 IEEE 15th International Symposium on Intelligent Systems and Informatics Proceedings

Publication Date: 2017-10-23

Volume: Unknown

Issue: Unknown

Page Range: 219-224

Description:

During car services, it is sometimes necessary to measure the effective performance of the engines. After repairs it is very useful to check the change of the performance. In this case you don't have possibility of dismantling. You can measure the vehicle on roll benches. In this case you have so-called wheel performance as result. The new method discussed and described in this article provides a solution to this problem. The paper contains the theoretical and practical introduction of the measurement of engine performance with diagnostic measurement processes.

Open Access: Yes

DOI: 10.1109/SISY.2017.8080556

Comparison of different linux containers

Akos Kovacs

Publication Name: 2017 40th International Conference on Telecommunications and Signal Processing Tsp 2017

Publication Date: 2017-10-19

Volume: 2017-January

Issue: Unknown

Page Range: 47-51

Description:

The new generation of virtualization is containerization. In this paper we measured the most common container techniques to determinate the performance of these techniques regarding computing power and network performance with industry standard measurement applications. We used these measurement results to compare them with native performance without any container techniques and with the Linux standard virtualization KVM performance. For the first time, this paper also measures the performance of the Singularity container system, which is a new approach of HPC systems container usage.

Open Access: Yes

DOI: 10.1109/TSP.2017.8075934