412 research outputs found
Thermally-enhanced oil recovery from stranded fields: Synergy potential for geothermal and oil exploitation
No full textAccepted author manuscriptReservoir EngineeringApplied Geolog
Upaya Pengenalan Masalah Kesehatan Pada Keluarga ny. S Khususnya an. Z Dengan Status Gizi Kurang Di Kabupaten Sukoharjo
No full textNutritional deficiency worldwide is one cause of death in children under 5 years of age due to a lack of nutrients, energy and protein which is the main energy source in humans in this case children under the age of 5 years.
Methods : Essay writer stacking using descriptive method with case study approach that the scientific method is to collect data, analyze the data and draw conclusions data.
Results : From the results of nursing care found that output in Mrs. S lack of knowledge about the health problems that occur in Child. Z causing An. Z deficiency in nutrition less than -3.3 curve by WHO in 2006 so that in this case the author as nurses provide nursing care in the form of health education regarding balanced nutrition in a child's age Child. Z
Conclusion : The family is the center of health care in total, because if one of the family members have health problems it will affect the system of the family members, family nursing care done by the family nursing approach
Investigation of the synergy potential of oil and geothermal energy from a fluvial oil reservoir
No full textGeothermal projects, as renewable energy projects, are not economically attractive in most places of the world at the current state of development; for this reason, subsidies are required by energy and environmental authorities in order to increase the interest in such projects. In this paper, we assess and model strategies for integration of geothermal energy with oil productions of the Moerkapelle oil field in the Netherlands. To do so, numerical simulations have been employed to analyse the feasibility of a fluvial oil reservoir for the synergy potential of oil and geothermal energy exploitation. In order to implement the simulation studies, single phase and two-phase non-isothermal fluid flow modelling are utilized for the geothermal well doublet system and for water flooding in an oil reservoir (including facies heterogeneity), respectively. A series of simulations have been conducted to investigate how hot water from a geothermal reservoir beneath a heavy oil reservoir in the fluvial sedimentary system of the West Netherlands Basin can be used for Thermal Enhanced Oil Recovery (TEOR) and geothermal energy production. This study finds that the high degree of heterogeneity in fluvial oil reservoirs could significantly affect oil recovery improvement and hence the synergy strategy. High values of a) Net to gross (N/G) b) Bottom Hole Pressure (BHP) and c) horizontal wellbore length are favourable for oil recovery. In contrast, wide horizontal wellbore spacing and high oil viscosity have an adverse effect on oil recovery enhancement. Furthermore, the results display that the enhanced oil production helps to reduce the required subsidy for a single doublet geothermal project up to 100%. Consequently, the extra amount of oil produced by utilising the geothermal energy, could make the geothermal business case independent and profitable.Accepted Author ManuscriptReservoir Engineerin
Exploring the evolution of biofuel supply chains: An agent-based modeling approach
No full textOne of the challenges of the twenty-first century is the transition to a sustainable energy system. Road transport biofuels can play an important role in this energy transition. Indeed, biofuels have the largest global share as a mitigation measure in the road transport sector. In 2012, biofuels accounted for 3.4% of global road transport fuel demand (2.3%of total transport fuels). Biofuels are also considered as a promising strategy to decarbonize other transport sectors such as marine and aviation in the short-medium term. Nevertheless, biofuels are not cost competitive compared to fossil fuels and thus require government intervention to stimulate their production and consumption...Energie and Industri
Discussion of ‘‘Re-Examination of Undrained Strength at Atterberg Limits Water Contents’’ by H.B. Nagaraj, A. Sridharan & H.M. Mallikarjuna
No full textHaving recently investigated soil strength at the Atterberg limits, the discussers read the paper by Nagaraj et al. (2012) with interest. Whilst some of the conclusions of the paper concur with those of our own work, there are other areas in which we would question the authors’ conclusions
Microstructural characterization of crack-healing enabled by bacteria-embedded polylactic acid (PLA) capsules
No full textThe current study investigates short-term and long-term crack-healing behaviour of mortars embedded with bacteria-based poly-lactic acid (PLA) capsules under both ideal and realistic environmental conditions. Two sets of specimens were prepared and subjected to different healing regimes, with the first set kept in a mist room for varying short durations (i.e., 1 week, 2 weeks, 3 weeks and 8 weeks) and the second set placed in an unsheltered outdoor environment for a long-term healing process (i.e., 1 year). Alteration of microstructure because of self-healing was characterized by backscattered electron (BSE) imaging and energy dispersive X-ray spectroscopy (EDS) via crack cross-sections. Results show that visible crack healing enabled by bacteria began after 2 weeks in a humid environment. The healing products initially precipitated at crack mouths and gradually moved deeper into cracks, with the precipitated calcium carbonate crystals growing larger over time. After 8 weeks, healing products can be found even a few millimetres deep inside cracks. Observations of crack healing in a realistic environment revealed significant differences compared to healing under controlled conditions. While no healing products can be found at crack mouths, a substantial healing process was observed throughout the entire crack depth. It is likely that the environmental actions such as rainfall and/or freeze and thaw cycles may have worn away the healing products at crack mouths and thus led to a deeper ingress of oxygen into cracks, which promoted the activation of healing agents and associated calcium carbonate precipitation deep inside a crack.Materials and Environmen
Zemstvo Doctor and Dramatist
No full textThe study of the life and professional activity of Hryhorii Maksymovych Borakovskyi (1846–?), zemstvo doctor, doctor of medicine, forensic expert, public figure, writer, extraordinary personality, has been carried out. He made a significant contribution to the development of zemstvo medicine in Katerynoslav-Dnipropetrovsk region. Hryhorii Borakovskyi headed the district and zemstvo hospital in Novomoskovsk for 27 years, performed a large number of surgeries. As an expert, he was invited to participate in complicated forensic cases. His reports about visits to hospitals in Moscow, Odesa, Palestine, Prague are of educational importance. Doctor H.M. Borakovskyi also occupies an honorable place in Ukrainian dramaturgy. He is an author of many vaudevilles, comedies, and dramas (the most famous one is «Marusya Churai»)
A fibre reinforced polymer quay wall: Feasibility study
No full textThe first quay walls were constructed in 2400 BC and were constructed with bricks. Since then, the quay walls have developed a lot. The quay walls nowadays are constructed out of steel, concrete or a combination of both materials. An upcoming material in the field of hydraulic engineering is fibre reinforced polymer (FRP). FRP has several advantages such as the low weight to strength ratio. Bridges and lock gates have already been constructed out of FRP. This thesis is a feasibility study to an FRP quay wall. An FRP quay wall is designed based on a reference project provided by the engineering bureau of Gemeente Rotterdam. CUR96 has been applied as a design guideline. The focus of this feasibility study is the retaining wall. The anchors and superstructure are not included in this study. A variant study has been conducted concerning 4 types of quay walls. The cantilever quay wall, an anchored quay wall, an L-wall and a caisson. For each of the variants a preliminary design has been made. As a result of the variant study the anchored quay wall is proven to be the most suitable type of quay wall. The maximum allowable deformation is based on the heeling angle and draught of the governing vessel as well as the distance between the moored vessel and quay wall. The quay wall from the case study has been modelled with the program ‘D sheet Piling’. The stiffness of the quay wall has been lowered until the deformation of the quay wall was more or less equal to the maximum deformation. The Young’s modulus of FRP is a static variable while the moment of inertia is a dynamic variable. The moment of inertia depends on the cross section of the quay wall profile. The cross section of the FRP quay wall is similar to Z-profiles used for steel sheet piling. The FRP quay wall consists out of 2 skin laminates, web laminates which connect the skin laminates with one another and foam that fills the space between the skins when no web is present. The foam has no significant mechanical properties and will therefore be neglected. The skin laminate has been designed as an anisotropic laminate while the web laminate has been designed as a quasi-isotropic laminate. The laminates are designed with the programs ‘eLamX2’ and ‘Kolibri’. According to CUR96 the strain in the laminates may not be higher than 0,27%. With a hand calculation, a 2D model in ‘SCIA’ and a 3D FEM model in ‘SCIA’ the strains in the laminates have been calculated for the governing loading combination. The skin and web laminates have been checked for the following failure mechanisms: buckling, interlaminar shear stress, wrinkling and shear stress between the laminates. From these checks it can be concluded that neither the skin nor the web laminate is sensitive to these failure mechanisms. Common checks related to quay walls have been performed as well. The anchor capacity, overall stability, bearing capacity and deadweight of the quay wall have been checked. The joints of the FRP quay wall have been discussed theoretically. This concerns the joints between 2 Z-profiles as well as the connection between the skin and web laminate. It is stated in design guidelines that the design of the joint between the skin and web laminate has to be verified with testing and a numerical calculation with a FEM. Literature shows that FRP is already being applied as shoring equipment but with a limited retaining height. The type of connection used in the shoring equipment is similar to the connections used with steel sheet piling. The required installation technique for a FRP quay wall has been researched as well. Driving, vibrating and pressing the FRP quay wall to the required depth is not feasible. A diaphragm wall installation technique is therefore assumed to be the best alternative. An LCA has been performed for the steel combi wall from the case study as well as for the FRP quay wall. The carbon footprint and environmental impact has been calculated for both quay walls and are compared to one another. The results are the same, the impact of the FRP quay wall is way bigger than the impact of the steel combi wall. The LCA has been performed for a running meter quay wall. The FRP quay wall has been compared to the steel combi wall based on the LCA. Both structures have also been compared to one another based on a cost estimation for a running meter quay wall. The result of this estimation is that the FRP quay wall is far more expensive than the steel combi wall. The conclusion of this feasibility study is that an FRP quay wall is technically feasible.Civil Engineering and GeosciencesHydraulic EngineeringCivil Engineerin
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