Search Results

1 - 10 of 66 items :

  • Energy Engineering x
Clear All
Efficiency of Water Quality Index Approach as an Evaluation Tool

of water quality of river Ravi at Madhopur (India).Global J Environ Sci. 2009;8(1):49-57. [5] Hurley T, Sadiq R, Mazumder A. Adaptation and evaluation of the Canadian Council of Ministers of the Environment Water Quality Index (CCME WQI) for use as an effective tool to characterize drinking source water quality. Water Res. 2012;46(11):3544-3552. DOI: 10.1016/j.watres.2012.03.061. [6] Kahler-Royer CA. A water quality index devised for the Des Moines River in Central IOWA. IOWA State University. Master of Science thesis - Supervised by

Open access
Acta Universitatis Sapientiae, Electrical and Mechanical Engineering
The Journal of Sapientia Hungarian University of Transylvania
Open access
Evaluation Of The Usefulness Of Spider Webs As An Air Quality Monitoring Tool For Heavy Metals

Abstract

The study aims at evaluating whether webs reflect the level of air pollution measured with conventional methods. Webs of species Malthonica silvestris (l. KOCH, 1872) (Araneae: Agelenidae) were sampled. Samples were analyzed for heavy metals (Pb, Zn) content. According webs analyses and classic measurements three traffic-oriented sites in Wroclaw (South-West Poland) showed significantly higher mean concentrations of heavy metals than two other sites situated in quieter, low traffic areas. A very strong significant positive correlation was revealed among average concentrations of Zn and Pb associated with fine particulate matter of atmospheric aerosol (PM1) and webs. We also observed a very strong significant positive correlation among Zn and Pb concentrations on webs and PM2.5. Any significant correlation among PM-emission fractions 2.5 and 10 and associated heavy metals and dust deposited on spider webs was not observed. Although spider webs proved useful indicators of environmental pollution the obtained results suggest that this tool should be used to evaluate the emission of heavy metals in the similar way as other bioindicators such as mosses and lichens are commonly used. The measured concentrations on webs do not reflect results obtained with classic methods. We conclude that spider webs are good for bioindication of road traffic emissions, they could be even more reliable compared to use of some other bioindicators whose activity is often limited by the lack of water and sun.

Open access
Metabolomics - Useful Tool for Study of Plant Responses to Abiotic Stresses

Metabolomics - Useful Tool for Study of Plant Responses to Abiotic Stresses

Abiotic stresses are produced by inappropriate levels of physical components of the environment and cause plant injury through unique mechanisms that result in specific responses. Metabolomics is a relatively new approach aimed at improved understanding of metabolic networks and the subsequent biochemical composition of plants and other biological organisms. The paper is focused on the use of metabolomics, metabolic profiling and metabolic fingerprinting to study plant responses to some environmental stresses (eg elevated temperature, chilling and freezing, drought, high salinity, UV radiation, high ozone levels, nutrient deficiency, oxidative stress, herbicides and heavy metals). Attention is also devoted to the effects of some environmental factors on plants such as high or low levels of CO2 or different levels of irradiance. Alterations of plants metabolites due to multiple abiotic stresses (drought-heat, drought-salinity, elevated CO2-salinity) are analysed as well. In addition, metabolomic approach to study plant responses to some artificial abiotic stresses, mechanical stress or pulsed electric field-induced stress is discussed. The most important analytical methods applied in metabolomics are presented and perspectives of metabolomics exploitation in the future are outlined, too.

Open access
About the Profile Accuracy of the Involute Gear Hob

] Yefim, Kotlyar, (2000). “Precision Finish Hobbing”, in Gear technology magazine, vol. 17, nr.4 , 2000. pp. 22-26. Retrieved on 16.04.2015, from http://www.lmt-tools.de/verzkat/page119.html #/124 [6] *** DIN 3972. Wälzfräser-Bezugsprofile [7] Hollanda, D., “Bazele așchierii și generării suprafețelor II”. lecture notes, Petru Maior University of Tîrgu-Mureș, 1994. [8] Dudás, I., Bányai, K., Varga, Gy., “Simulation of meshing of worm gearing”, in American Society of Mechanical Engineers, Design Engineering Division (Publication) DE 88 , 1996, pp

Open access
Using ATP tests for assessment of hygiene risks

Passos FJ, Sebastião Brandão SC, Rodrigues CG. Braz Arch Biol Technol. 2004;47(3):399-405. DOI: 10.1590/S1516-89132004000300010. [43] Deininger R, Lee J. Field Anal Chem Technol. 2001;5(4):185-189. DOI: 10.1002/fact.1020. [44] Deininger R, Lee J. Rapid detection of bacteria in drinking water. In: Omelchenko A, Pivovarov AA, Swindall WJ, editors. Modern Tools and Methods of Water Treatment for Improving Living Standards. Netherlands: Springer; 2005. http://link.springer.com/chapter/10.1007%2F1-4020-3116-5_4#page-1 . [45] Deininger R, Lee J, Clark R

Open access
Quality of Rivers: Comparison of Hydro-Morphological, Physical-Chemical and Biological Methods

-deck imputation of missing data. Ecol Indic. 2012; 17:108-119. DOI:10.1016/j.ecolind.2011.04.023. [4] Turley MD, Bilotta GS, Extence CA, Brazier RE. Evaluation of a fine sediment biomonitoring tool across a wide range of temperate rivers and streams. Freshwater Biol. 2014;59(11):2268-2277 DOI: 10.1111/fwb.12429. [5] Nichols SJ, Barmuta LA, Chessman BC, Davies PE, Dyer FJ, Harrison ET, et al. The imperative need for nationally coordinated bioassessment of rivers and streams. Mar Freshwater Res. 2017;68(4):599-613. DOI: 10.1071/mf15329. [6] Beavan L, Sadler J

Open access
The Demonstration Model of an Electromagnetic Accelerator Gun

Abstract

These days a lot can be heard about special weapons which accelerate the projectile not based on the traditional, chemical energy release, but providing the muzzle velocity with the help of electromagnets. In English terminology, many descriptions can be read about these devices, referred to as “coilgun”. There are so many hobbyist and amateurs who make these devices [1,2] and publish their results on the internet [3,4]. The purpose of the project is dual. On one hand, features, advantages, disadvantages and the limits of the electromagnetically accelerated weapons can be found by building an experimental tool. On the other hand, it was intended to point out the fact that anybody can build such a tool using commercially available commercial components. Although the muzzle energy of the device presented in this paper is not more than 6.8J, but it can cause serious injury. The paper also points out that in a similar way, still not using special components, a weapon can be made with a larger (10-20J) muzzle energy.

Open access
Application of Artificial Neural Networks in the Dimensioning of Retention Reservoirs

Abstract

One of the essential needs for retention reservoirs is to reduce the volume of wastewater flows in sewer systems. Their main advantage is the potential to increase retention in the system, which in turn improves hydraulic safety by reducing the risk of node flooding and the emergence of the phenomenon of “urban flooding”. The increasingly common use of retention reservoirs, the observed changes in the climate and the development of dedicated software tools necessitate the updating of the methods used to dimension retention reservoirs. So far, the best known procedures in this regard involve the application of analytical formulas and tools in the hydrodynamic modelling of current sewage systems. In each case the basis for the retention facility design is the evaluation of rainfall in terms of the probability of occurrence and duration that would result in a critical rainwater flow condition in the sewer system in order to define the required reservoir retention capacity. The purpose of this paper is to analyse of the feasibility of applying artificial neural networks in the preliminary estimation of the duration of critical rainfalls. Such an application of these networks is essential to the process of hydrodynamic modelling of the system and to determining the required retention capacity of the reservoir. The study used an artificial neural network model typically used as part of planning processes, as well as the Statistica software suite.

Open access
The ways to increase efficiency of soil bioremediation

Abstract

The aim of this paper was to present possibilities of using different substrates to assist the bioremediation of soils contaminated with heavy metals, pesticides and other substances. Today's bioengineering offers many solutions that enable the effective conduct of biological remediation, including both biostimulation and bioaugmentation. For this purpose, they are used to enrich various organic substances, sorbents, microbiological and enzymatic preparations, chemical substances of natural origin or nanoparticles. The use of genetic engineering as a tool to obtain microorganisms and plants capable of efficient degradation of pollutants may cause the risks that entails the introduction of transgenic plants and microorganisms into the environment. In order to determine the efficacy and possible effects of the various bioremediation techniques, it is required to conduct many studies and projects on a larger scale than only in the laboratory. Furthermore, it should be emphasized that bioremediation involves interdisciplinary issues and therefore, there is a need to combine knowledge from different disciplines, such as: microbiology, biochemistry, ecology, environmental engineering and process engineering.

Open access