Due to the multiculturalism of this region, the rural tourism products most demanded by the tourists are natural and cultural resources, and the traditions and customs of the Banat’s village. The ...history of the people living here and the crafts such as pottery or traditional agricultural produce processing constitute but part the tourism offer of the Banat’s village for those in search of authenticity. Introducing these tourism products among other tourism products can help promoting both tourism products and routes because the interest in the tourism destinations is already known.
Ecotourism Management in Banat’s Protected Areas Ionuţ Mircea Petroman; Ioan Csosz; Cornelia Petroman ...
Lucrări științifice zootehnie şi biotehnologii,
09/2023, Letnik:
47, Številka:
2
Journal Article
Odprti dostop
The strategies developed in the field of ecotourism contribute to the creation of a favourable environment in this sector of activity and to the meeting of tourists’ demands without endangering the ...natural resources in the Banat’s protected areas. Management should take into account the main requirements regarding the ecological exploitation of the areas, the judicious exploitation of the tourist flows and the establishment of support thresholds as well as the implementation of material recycling measures in the area. Cooperation between rural and ecological tourism produces benefits such as diversification of economic activities, development of infrastructure and increase of demand for rural goods and services – all this contributing to the long-term economic stability in areas with such natural resources.
With its about 10 million sheep and goats, Romania ranks third in Europe after United Kingdom and Spain. Though, in Romania, lamb consumption is significant only at Easter, at world level mutton is ...much appreciated. In Romania, according to the General Agricultural Census in 2010, there were 8,386,000 sheep, of which 8,152,000 (97.21%) on agricultural establishments with no legal personality and 234,000 (2.79%) on legal personality establishments. There were also 1,237,000 goats exclusively on farms with no legal personality. The domestic market, lamb demand has decreased these last years significantly because of the decrease of the purchase power of the Romanians and because of the better export price. Demands at world level ask Romanian sheep breeders to improve their animals in order to produce better meat and milk. Romania benefits from a series of factors that will allow it, in time, to achieve better performances both quantitatively and qualitatively, particularly in sheep.
Tracking sinusoidal references with high precision and rejection of sinusoidal disturbances is a challenging task in the motion control practice. In order to deal with this control problem, a new ...resonant extended state observer is proposed and introduced in the active disturbance rejection control concept. The frequency analysis shows that an appropriate selection of resonant frequency provides complete rejection of sinusoidal disturbance and ideal reference tracking in the steady state. Further, it is shown that the proposed structure achieves better performances than generalised extended state observer based system in the wide frequency range. Moreover, in order to improve the system performances in transient period, the optimal parameter tuning method is developed. The results demonstrate that the optimally tuned system achieves better performances than the conventionally tuned one by about 25%, with the same robustness and noise sensitivity. The experimental validation of the new controller is carried out on the laboratory model of the didactic three-axis radar platform in fast sinusoidal reference tracking mode.
The Sava River Basin is a major drainage basin of southeastern Europe, significantly influenced by anthropogenic activities. Our study was focused on diatom communities as an indicator of the ...ecological status of running waters. We investigated over 937km of the Sava River at 19 sampling sites. Benthic diatom communities and 17 diatom indices were analyzed along with a large set of environmental parameters. CCA revealed that the most important elements along the spatial gradient were As and Si. Our results show that the species Navicula recens (Lange-Bert.) Lange-Bertalot and Eolimna minima (Grunow) Lange-Bertalot are very abundant at downstream localities where the highest concentrations of As were measured. The number of motile diatoms increased along the nutrient gradient, i.e. with Si availability. Correlations between diatom indices and selected environmental factors showed that temperature, As, Si and Fe are in significant negative correlation with most diatom indices. Analysis revealed the influence of As and metals in water on diatoms, although their concentrations did not exceed environmental standards. While our findings do not confirm that diatom indices reveal the intensity of pressures solely caused by nutrient and/or organic pollutants, they suggest that in moderately polluted large rivers benthic diatoms are good bioindicators of multiple pressures, and that diatom indices could serve as indicators of the level of overall degradation of an ecosystem.
Display omitted
•Benthic diatoms in the Sava River under anthropogenic pressures were studied.•In large rivers, diatoms are indicators of multiple pressures.•Arsenic and silicon are important factors determining diatom communities.•Diatom indices are appropriate metrics for overall degradation of large rivers.
This study deals with bleak (
Alburnus alburnus
) sensitivity in detecting of the wastewater related pressure in large lowland rivers. The major objective was to investigate if the response measured ...in bleak should be linked to a certain stretch of the river and characterised as ”stretch specific”, or it should be linked to the sampling site and characterised as ”site specific”. The response was evaluated via condition index, metal pollution index, DNA damage and cell viability using integrated biomarker response approach. The study was conducted at 3 sub-sites characterized by different pollution levels in a relatively short stretch (2 km) of the Sava River (Serbia). Results indicated that the response of the biomarkers in bleak can be interpreted as ”site specific”. Among the studied biomarkers, DNA damage assessed by comet assay and micronucleus test has shown high sensitivity in differentiation of the sites.
•Active disturbance rejection controller for multi-axis control platform is proposed.•Robustness analysis of the considered controller in frequency domain is given.•FPGA system level-based ...implementation of the ADRC algorithm is analyzed in detail.•Experimental results show good dynamic and tracking performances.
The real-time control of high precision multi-axis system with modeling uncertainties and strong nonlinear coupling dynamics is a demanding task for conventional multivariable control applications. To this end, this research addresses the design of Active Disturbance Rejection Control (ADRC) for multi-axis system and its implementation in the Field Programmable Gate Array (FPGA) platform. For the ADRC algorithm, the minimum plant model information is necessary, and that enables a strong system robustness and adaptability under modeling uncertainty, coupling effects and external disturbances. Distinct from the traditional Very high speed integrated circuit Hardware Description Language (VHDL) design, the proposed FPGA implementation of ADRC is based on the system level design and it considerably reduces the design cycle. Moreover, the optimal fixed-point realization and controller architecture are selected as a tradeoff between control performances and FPGA resource occupancy. The ADRC tracking performances, robustness and stability are confirmed through the frequency domain analysis and experimentally validated on three-axis didactic radar antenna control system in different working conditions.
Introduction/purpose: The hydraulic buffering valve has the greatest influence on the dynamic characteristics of power-shift transmission. The hydraulic buffering valve is a transmission element that ...controls increase in pressure in friction assemblies during the gear shifting process. By choosing the optimal control of pressure increase during shifting, reduction of dynamic loads in gear transmissions and thermal loads in friction assemblies is achieved. Methods: The paper analyzes the principle of one of hydraulic buffering valve solutions as well as the influence of certain parameters on the control of pressure increase. After the analysis of the working principle of the hydraulic buffering valve, a simulation model was developed in the MATLAB/Simulink software package. Results: The results obtained using the simulation model were compared with the experimental results of the selected pressure modulator solution. The selected hydraulic buffering valve was developed as part of the development of a device for power-shift transmission. The simulation results showed a satisfactory match with the experimental results. Conclusion: The developed simulation model enables a relatively easy and quick change of the parameters of the hydraulic buffering valve as well as a possibility of a faster and better understanding of the influence of individual parameters on pressure increase during the gear shifting process.
Current ulcerative colitis (UC) treatments are focused on symptom management primarily via immune suppression. Despite the current arsenal of immunosuppressant treatments, the majority of patients ...with UC still experience disease progression. Importantly, aggressive long-term inhibition of immune function comes with consequent risk, such as serious infections and malignancy. There is thus a recognized need for new, safe and effective treatment strategies for people living with UC that work upstream of managing the symptoms of the disease. The objective of this study was to evaluate a microbial-based treatment, QBECO, that functions to productively activate rather than suppress mucosal immune function as a novel approach to treat UC.
Two established models of experimental colitis, namely chemically-induced DSS colitis and the spontaneous colitis that develops in
deficient mice, were used to assess whether QBECO treatment could ameliorate gastrointestinal disease. A small exploratory 16-week QBECO open-label trial was subsequently conducted to test the safety and tolerability of this approach and also to determine whether similar improvements in clinical disease and histopathology could be demonstrated in patients with moderate-to-severe UC.
QBECO treatment successfully reduced inflammation and promoted mucosal and histological healing in both experimental models and in UC patients. The preclinical models of colitis showed that QBECO ameliorated mucosal pathology, in part by reducing inflammatory cell infiltration, primarily that induced by neutrophils and inflammatory T cells. The most rapid and noticeable change observed in QBECO treated UC patients was a marked reduction in rectal bleeding.
Collectively, this work demonstrates for the first time that strategically activating immune function rather than suppressing it, not only does not worsen colitis induced-damage, but may lead to an objective reduction in UC disease pathology.
Background/Aim. The best treatment for the occlusion of the largest artery in the thigh is a femorodistal (FD) bypass. Ankle-brachial index (ABI) and multidetector computed tomographic (MDCT) ...angiography are the gold standards for diagnosing peripheral arterial occlusive disease. The finite element analysis (FEA) method can help measure the quantity of blood flow and arterial pressure in the arteries in the leg. The aim of this study was to examine the possibility of using the FEA method in predicting the outcome of FD bypass surgery. Methods. The study involved 45 patients indicated for FD arterial reconstruction from December 1, 2021, to March 31, 2023. Each patient underwent pre- and postoperative MDCT angiography of the arteries of the lower extremities, on the basis of which, with the use of FEA, models were made for measuring ABI. All patients had their ABI measured pre-operatively and postoperatively using the Doppler ultrasound and sphygmomanometer. Based on the findings of the preoperative MDCT angiography, postoperative virtual surgical models were created using the FEA method, on which ABI were also measured. The values of ABI were divided into five groups: ABI measured preoperatively (ABI pre-op), ABI measured postoperatively (ABI post-op), ABI measured on FEA models based on the MDCT findings ABI (sim) pre-op, ABI sim post-op, and ABI measured on virtual surgery model ABI sim post-op (virtual). The ABI of the models were statistically compared with preoperative and postoperative measurements done on patients. Results. The values based on the virtual ABI model did not show significant differences compared to the values obtained on patients and values obtained with the FEA method using MDCT angiography (p < 0.001). A strong statistically significant correlation was shown between the virtual ABI and the values obtained by the other two methods, measured on the postoperative MDCT angiography model and virtual postoperative model (p < 0.001). Conclusion. Virtual simulation based on the MDCT angiography parameters of peripheral blood vessels can be successfully used to predict the immediate outcome of the FD bypass surgery.
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