Search results for "Environmental engineering"
showing 10 items of 2674 documents
Cheap Sensor Made of Multicrystalline Silicon for Insolation and Temperature Measurements
2016
Abstract In the paper some results on measurement of insolation and „real” cell’s temperature carried out with use of standard silicon solar cells are presented. Two identical cells are applied in such a sensor. Short circuit current of one cell is a direct indication of insolation value and open circuit voltage of the other cell is indirect indication of actual sensor’s temperature but in this case more complex formula must be used for temperature calculation.
A software for the integrated design of wastewater treatment plants
1998
Abstract A software package has been developed for automated design of wastewater treatment plants. A user-friendly environment has been implemented to facilitate design tasks, allowing rapid evaluation of different alternatives as well as performing sensitivity analyses. Flexible treatment plant configurations can be established with preliminary, primary, biological and tertiary wastewater treatments, and sludge treatment units. A generalized steady-state model developed for biological processes is also included. The design process includes treatment units sizing, plant layout, hydraulic profile calculation and equipment assignment. The system capabilities for designing new plants and upgr…
Lethal and behavioural effects of a green insecticide against an invasive polyphagous fruit fly pest and its safety to mammals
2021
Abstract Plant essential oil-based insecticides, with special reference to those that may be obtained from largely available biomasses, represent a valuable tool for Integrated Pest Management. However, the sublethal effects and the potential effects on aggressive insect traits of these green insecticides are understudied. Herein, the lethal and sub-lethal effects of the carlina oxide, constituting more than 97% of the whole Carlina acaulis (Asteraceae) root essential oil (EO), were determined against an invasive polyphagous tephritid pest, Ceratitis capitata (medfly). The carlina oxide was formulated in a mucilaginous solution containing carboxymethylcellulose sodium salt, sucrose, and hyd…
Integrated modelling of the influence of urbanization and climate change on river water quality
2010
Climate change is one of the most important drivers modifying the hydrologic and environmental characteristics of natural catchments. When dealing with the quality of natural waters, these factors should be weighed up against anthropogenic factors that may increase or decrease the effect of climatic modifications. However, a detailed and more generalised analysis of such environmental impacts at a relatively small scale is currently lack. This paper aims to fill this gap. The use of a holistic approach is also required by the EU Water Framework Directive, which prescribes integrated analysis for river basin management in order to meet environmental and ecological objectives. In order to qua…
Uncertainty Assessment of a Water-Quality Model for Ephemeral Rivers Using GLUE Analysis
2011
Every model is, by definition, a simplification of the system under investigation. Although it would be desirable to reduce the gap between the simulated and the observed behaviors of the system to zero, this reduction is generally impossible owing to the unavoidable uncertainties inherent in any modeling procedure. Uncertainty analyses can provide useful insights into the best model approach to be used for obtaining results with a high level of significance and reliability. The evaluation of parameter uncertainties is necessary for calibration and for estimating the impact of these uncertainties on model performance. In this context, the uncertainty of a river water-quality model developed…
Assessment of data availability influence on integrated urban drainage modelling uncertainty
2009
In urban water quality management, several models are connected and integrated for analysing the fate of pollutants from the sources in the urban catchment to the final recipient; classical problems connected with the selection and calibration of parameters are amplified by the complexity of the modelling approach increasing their uncertainty. The present paper aims at studying the influence of reductions in available data on the modelling response uncertainty with respect to the different integrated modelling outputs (both considering quantity and quality variables). At this scope, a parsimonious integrated home-made model has been used allowing for analysing the combinative effect of data…
A Borderland and the Local Authority
2014
In the era of globalization, unifi cation and the disappearance of borders, paradoxically, increasingly important is their determination, stressing the diversity, regionalization eff orts to achieve autonomy. Th is is evident in the ongoing scientific discussion at the junction of many areas where there is the issue of the border is quite clearly marked. Th ese considerations place them in the context of politics, and therefore power, but located locally. This authority, its scope, instruments are determined by the nature of the border, which is analyzed in relation to the center. Th us, they are seen as places where all processes are either specific or autonomous in relation to those occur…
Legal and Political Determinants of Implementation of the Principle of Subsidiarity in the Federal Republic of Germany
2015
It is not surprising that subsidiarity is very often discussed with autonomy and federation (equally multidimensional concepts, similarly discussed in science). It is clearly evident taking into account, for example, results of analysis of the key words (tags) in scientific publications. The European Union has significantly contributed in popularizing of the concept so it is no surprise that strongly linked with EU's problems has become a central point of the discussion of its organizational structure and internal relationships between forming elements. It is difficult to imagine analysis of the conditions for implementing of subsidiarity in Germany without prior presentation of the state p…
European federation as a systemic response to the crisis of leadership in Europe?
2015
The idea of European federation keeps recurring in politicians' and intellectuals' discourses on the future of the European Union. The logic of global rivalry of “large territories” favors this in particular, as it somehow forces Europe’s states to enter into a tighter integration if they want to realize their politics. The biggest challenge which the Union faces is the problem of leadership, understood both in the context of internal policy and relationally towards the surrounding. The problem, however, is the diversity of the member states and the unrelenting tension between particular concern about a national interest and European universalism. European federation sensu stricto, just bec…
The Role of the Principle of Subsidiarity in the Third Sector in the Republic of Poland
2015
The principle of subsidiarity not only has formed many of provisions in the act on Public Benefit and Volunteer Work (particularly those related to social consultations and transferring of public tasks), but is also a directive forming the cooperative habits between the public and non-public sectors. This is a matter of great importance taking into account that the subsidiarity in Poland is not effectively implemented as it could be because of limited autonomy of the self–government and frequently occurring interference of the State. Unfortunately it results in limiting of ability to decide on the type and methods of performing tasks. In addition, financial resources usually are not suffici…