•The explosion properties of n-alkane/nitrous oxide (N2O) mixtures are investigated.•N2O mixtures exhibit higher explosion pressures than the corresponding O2 mixtures.•The LEL values are in the ...following order: alkane/O2≈alkane/air > alkane/N2O.•The Burgess–Wheeler law is observed to hold for the alkane/N2O mixtures.
The explosion properties of alkane/nitrous oxide mixtures were investigated and were compared with those of the corresponding alkane/oxygen and alkane/air mixtures. The explosion properties were characterized by three parameters: the explosion limit, explosion pressure, and deflagration index. For the same alkane, the order of the lower explosion limits (LELs) of the mixtures was found to be alkane/oxygen≈alkane/air>alkane/nitrous oxide. In addition, the mixtures containing nitrous oxide tended to exhibit higher explosion pressures than the corresponding mixtures containing oxygen under fuel-lean conditions. The Burgess–Wheeler law was also observed to hold for the mixtures containing nitrous oxide.
Full text
Available for:
GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
This paper reviews the opportunities of ecotourism development in South Georgia, in particular, in the Gujareti valley located in Samtskhe-Javakheti region which has a rich tourism and recreation ...potential. Recreation areas with unused potential are strengthening the tourism and recreation cluster of Samtskhe-Javakheti with new capabilities. For this purpose the example and experience of Borjomi-Kharagauli National Park, natural conditions, balnelogy resources and medieval cultural heritage of the Gujareti valley have been studied. In the SWOT-table the supporting and obstructing factors of the development were analyzed.
The general concept for landscape planning of spatial zoning were worked out, which envisages the protection of natural diversity, prospects of cultural, educational, healthcare tourism and supports interests of local communities, in terms of ecotourism promotion and creates a positive environment for organic agriculture.
Full text
Available for:
GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
CONFERENCES REGARDING ENVIRONMENTAL PROTECTION DOBRESCU M. EMILIAN; POCIOVĂLIȘTEANU DIANA MIHAELA
Analele Universităţii Constantin Brâncuşi din Târgu Jiu : Seria Economie,
12/2015, Volume:
1, Issue:
Special Issue ECO-TREND 2015
Journal Article
Peer reviewed
Open access
The international community decided to resolve the issues regarding the environment through collective measures at a global level, which it tried to define and apply through the use of a proper ...international framework. This action framework at international level was created in time and is constantly evolving, including legally binding measures as treaties or conventions or non binding measures, as declarations, resolutions or compilations of executive guidances and political orientations, of the institutional measureas and sustainable financing mechanisms.
In China’s western coal mining area, the traditional room mining technology is facing coal pillar instability, mine earthquake, large-area roof subsidence in the goaf, surface subsidence, water and ...soil loss, vegetation deterioration, and other environmental problems. To solve the aforementioned problems and to improve coal recovery, the roadway backfill coal mining (RBCM) method was proposed as a solution and its technical principle and key equipment were presented in this paper. In addition, the microstructure and mechanical behavior (strain-stress relation in confined compressive test) of aeolian sand and loess backfill materials were studied for a rational backfill design for underground mines. Further, coal pillar stress, plastic zone change, and surface deformation of the RBCM schemes were studied using the FLAC
3D
numerical simulation software, and a reasonable mining scheme of “mining 7 m and leaving 3 m” was determined. The engineering application in Changxing Coal Mine shows that the RBCM method with loess and aeolian sand as backfill materials allows a stable recovery of coal pillars with a recovery ratio of more than 70 %. The maximum accumulated surface subsidence and the maximum horizontal deformation were measured to be 15 mm and 0.8 mm/m respectively, indicating that the targeted backfilling effect can help protect the environment and also control surface subsidence.
Full text
Available for:
EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
The quality of the Soła river flowing into the dam reservoir Tresna was presented in this paper. This is the highest reservoir of so called Sola cascade, which is important in case of flood control ...and as a reservoir of water used for municipal purposes. The aim of the study was to evaluate the effectiveness of protective measures for water resources realized in reservoirs catchment. Presented results showed positive influence on water quality of Soła river, but some parameters has remained at unsatisfactory levels. Especially the excessive load of nitrogen and phosphorus which flows into the reservoir was observed. The last mentioned, in flood conditions, also applies to solids (suspensions). Furthermore microbial contamination was noticed as well. All those factors indicates not entirely appropriate spatial planning of basin area.
This article presents the complex processing of low-grade and substandard chromium ores, as well as sludge tailings, with the production of composite chromium-containing materials and pigments, while ...improving environmental performance in the Republic of Kazakhstan through the utilization and processing of technogenic raw materials. In this work, to study the physicochemical properties of the starting materials, modern analytical, thermodynamic, chemical, granulometric, as well as computational, mathematical, laboratory, and experimental methods were used. In particular, studies of a method for producing composite pellets for chromite pigments based on industrial technogenic waste of the Republic of Kazakhstan are presented. Based on the results of the experimental studies, composite pellets were obtained, having a compressive strength of 150–220 kg/pellet and containing 49.7% of chromium oxide and 0.5–1.0% of carbon in its composition. The resulting chromite pigment based on the composite pellets is a modification of chromium oxohydroxide with the formula γ-CrOOH. The density of the resulting pigment is 3.4 kg/m3. The chromite pigment based on the composite pellets is recommended for use in various coloring compositions, including using it for printing on cotton and mixed fabrics intended for sewing outerwear.
Improved Low-Drag Pontoons for Water Bikes Nesteruk, Igor; Krile, Srećko; Möller, Thorsten
Journal of marine science and engineering,
09/2023, Volume:
11, Issue:
9
Journal Article
Peer reviewed
Open access
The popularity of modern water bikes increases due to the relatively high speed developed with the use of a human muscle power only. For example, the maximum speed of prototypes reaches the value 3 ...m/s. Similar vehicles can be used not only for recreation and fitness, but also for transportation. To increase their speed and tonnage, we recommend improving the pontoon shape and using electrical power. The underwater part of the pontoon shape was recommended to be similar to the body shape of the fastest fish in order to decrease the wave resistance and total drag. The optimal depth of the movement of corresponding shapes was calculated. The total drag and maximum speeds of the vehicles with the human muscle and electrical power are estimated. Expected success in improving the pontoon shape opens wide prospects for the use of these special-shaped hulls in shipbuilding.
This article is the revised text of the 2020 Stockholm Environmental Law lecture. Its two parts discuss, respectively, some of the issues surrounding access to justice by NGOs in order to protect the ...environment and whether the time has come to add a fifth crime of ‘ecocide’ to the crimes against humanity that are criminalised under the Rome Statute.
This paper reports the development and characterization of new ceramics from hazardous bauxite red mud (50 to 100 wt. %) and blast furnace slag (10 and 50%). The research aimed to demonstrate the ...possibility of expanding the base of powder raw materials for production of ceramics, completely replacing the traditional clay and sand with composites made from hazardous industrial wastes, which provide increasing local and global sustainability. The investigation of the physical–chemical changes in the ceramics structure was conducted by the AAS, XRD, SEM, XRF, LAMMA, and EDS tests. Changes in water absorption, density, linear shrinkage, and flexural strength were determined while the sintering processes ranged from 1000° to 1225 °C. Flexural strength reached 19.78 MPa after sintering at 1225 °C due to the syntheses of new structure formations, mainly similar to glass, confirmed by the characterization methods used, attesting to the complete binding of heavy metals.
Full text
Available for:
CEKLJ, EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
Urban sewage sludge treatment is important for sustainable utilisation and virtuous cycle of freshwater resources. However, with the improvement of sewage discharge standards, ensuring stable ...operation of sewage sludge treatment plants is becoming an urgent problem to be solved in the sewage treatment industry. This paper proposes a FNN control framework based on different working conditions to optimise the whole process of municipal sewage sludge treatment and discharge. The framework first divides the working conditions according to the weather, forming a separate feature and an input vector together with the typical indicators of other sewage treatment plants. Then the FNN is used to complete the control and optimisation of various indicators, achieving the dual objectives of reducing energy consumption and optimising water quality. Finally, the model is tested for the tracking index of sewage flow. The results demonstrate that the FNN control method used has significantly lower MAE than the single method in the two indexes of energy consumption and water quality evaluation. This provides new ideas for the optimisation of urban sewage sludge treatment process in the future. Overall, the paper effectively highlights the importance of urban sewage sludge treatment and presents a well-designed FNN control framework for optimising the treatment process. Additionally, the paper could benefit from further elaboration on the significance of the results obtained, and suggestions for future research in this area.
PDF
