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Статті в журналах з теми "EOQ formula":
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Vujošević, Mirko, Dobrila Petrović, and Radivoj Petrović. "EOQ formula when inventory cost is fuzzy." International Journal of Production Economics 45, no. 1-3 (August 1996): 499–504. http://dx.doi.org/10.1016/0925-5273(95)00149-2.
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Smola, Douglas A., and Bob L. Foote. "On Plenert's bottleneck formula for constrained EOQ." Journal of Manufacturing Systems 13, no. 1 (January 1994): 59–60. http://dx.doi.org/10.1016/0278-6125(94)90018-3.
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Islam, Nafish Sarwar. "A Variant Deterministic Model of Classical EOQ Formula." IOSR Journal of Business and Management 14, no. 3 (2013): 09–11. http://dx.doi.org/10.9790/487x-1430911.
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Kohn, W. S. "Sticking up for an ‘old friend’—the EOQ formula." Production Engineer 64, no. 2 (1985): 13. http://dx.doi.org/10.1049/tpe.1985.0034.
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Axsäter, Sven. "Using the Deterministic EOQ Formula in Stochastic Inventory Control." Management Science 42, no. 6 (June 1996): 830–34. http://dx.doi.org/10.1287/mnsc.42.6.830.
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Turnip, Melpa Syari Kristiani, and Dwi Kartikasari. "ANALISIS PERBANDINGAN PENGENDALIAN PERSEDIAAN BAHAN BAKU METHANOL ANTARA PENDEKATAN MODEL ECONOMIC ORDER QUANTITY DENGAN JUST IN TIME PADA CV MAMABROS SERVICINDO BATAM." JOURNAL OF APPLIED MANAGERIAL ACCOUNTING 1, no. 2 (September 28, 2017): 77–90. http://dx.doi.org/10.30871/jama.v1i2.471.
Анотація:
Penelitian ini bertujuan untuk mengetahui metode pengendalian persediaan yang optimal digunakan oleh CV Mamabros Servicindo Batam dengan membandingkan antara kebijakan yang telah dijalankan perusahaan dengan dua metode persediaan yaitu Economic Order Quantity dan Just In Time. Teknik pengumpulan data yang digunakan dalam penelitian ini observasi, dokumentasi dan wawancara. Metode analisis data yang digunakan dalam penelitian ini adalah EOQ formula, Safety Stock, Reorder Point serta Just In Time Formula. Hasil penelitian menunjukkan bahwa sistem EOQ dan JIT lebih efisien dibandingkan dengan sistem persediaan perusahaan. Namun sistem JIT memiliki tingkat efisiensi biaya yang lebih tinggi dibanding sistem EOQ. Pada tingkat permintaan persediaan methanol 41.273 liter, sistem persediaan perusahaan menghasilkan biaya persediaan sebesar Rp 6.946.052, dibandingkan dengan JIT yang hanya memiliki biaya persediaan sebesar Rp 3.056.263 dapat menghemat biaya sekitar Rp 3.889.789 atau 55% lebih efisien dari biaya persediaan perusahaan. Sedangkan metode EOQ menghasilkan biaya persediaan sebesar Rp 3.700.608, atau hanya 46% lebih efisien dari biaya persediaan berdasarkan kebijakan perusahaan.
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BEYER, DIRK, and SURESH P. SETHI. "A proof of the EOQ formula using quasi-variational inequalities." International Journal of Systems Science 29, no. 11 (November 1998): 1295–99. http://dx.doi.org/10.1080/00207729808929616.
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van Delft, Ch, and J. P. Vial. "Discounted costs, obsolescence and planned stockouts with the EOQ formula." International Journal of Production Economics 44, no. 3 (July 1996): 255–65. http://dx.doi.org/10.1016/0925-5273(96)80001-u.
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Ghafour, Karzan Mahdi, and Rezan Hama Rashid. "Optimizing Multi-Item EOQ when the Constraint of Annual Number of Orders is Active." Modern Applied Science 11, no. 1 (October 5, 2016): 55. http://dx.doi.org/10.5539/mas.v11n1p55.
Анотація:
The responsibility in inventory models decides of how much or how many of inventory items to order. An economic order quantity (EOQ) differs from a model to another according to the assumptions and the variables. This paper has developed the EOQ in two deterministic inventory model (Purchases with shortage and production with shortage) of multi-item when the objective function is subjected to annual number of orders. The constraints are assumed to be active if the left hand side does not satisfy the right hand side condition. Thus, Lagrange method is used to find the new multi-item EOQ in each two models with the constraint to achieve the new formula of EOQ. Finally, a numerical example is provided to justify the proposed model.
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Sphicas, Georghios P. "Generalized EOQ formula using a new parameter: Coefficient of backorder attractiveness." International Journal of Production Economics 155 (September 2014): 143–47. http://dx.doi.org/10.1016/j.ijpe.2013.09.014.
Дисертації з теми "EOQ formula":
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Vinberg, Karl, and Lukas Klevtun. "Etablering av strategier och rutiner för seriestorlekar : En fallstudie på Företag X." Thesis, Linnéuniversitetet, Institutionen för ekonomistyrning och logistik (ELO), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-104999.
Анотація:
Purpose: The purpose of the study is to identify, design and apply a method for operational production planning. The purpose of the method is that it takes into account the respective demand patterns of the articles, which determines the choice of calculation model and that the method also takes into account the production capacity limitation set. The result can be applied as a basis for decision-making for small and medium-sized manufacturing companies that are facing an expansion. Objective: The following research question was the main objective of this study.How would an appropriate operational planning method be shaped according to the specific characteristics of the products and their diverse demand patterns in small and medium-sized manufacturing companies with capacity limiters? Method: The study is a qualitative one-case study with quantitative elements. The empirical data used in the study was collected through unstructured and semi-structured interviews where the snowball effect has been applied and also observations have been performed. Results: The study has enabled a higher degree of utilization of the capacity limitation set, by developing standardized block sizes. The first step was to identify demand patterns into which the studied articles could be categorized. The demand pattern was applied in order to be able to apply the correct calculation model to the correct article. The calculation model was then standardized by applying PoT to be able to obtain standardized block sizes. The method was illustrated in a Gantt chart to demonstrate its usefulness.Syfte: Studiens syfte är att identifiera, utforma och applicera en metod för operativ produktionsplanering. Ändamålet med metoden är att den tar hänsyn till artiklarnas respektive efterfrågemönster vilket avgör valet av beräkningsmodell samt att metoden tar även hänsyn till produktionens kapacitetsbegränsning ställare. Resultatet kan appliceras som beslutsunderlag för små samt medelstora tillverkande företag som står inför en expansion. Forskningsfråga: Följande forskningsfråga var objektet för denna studie. Hur skulle en lämplig operativ planering formas utefter artiklarnas specifika egenskaper och deras olikartade efterfrågemönster hos små och medelstora tillverkande företag med kapacitetsbegränsningen ställare? Metod: Studien är en kvalitativ en-fallstudie med kvantitativa inslag. Den empiriska data som använts i studie än insamlad genom ostrukturerade samt semistrukturerade intervjuer där snöbollseffekten tillämpats och även observationer har utförts. Resultat: Studien har möjliggjort en högre utnyttjandegrad av kapacitetsbegränsningen ställare, genom att framta standardiserade blockstorlekar. Första steget var att identifiera efterfrågemönster som de studerade artiklarna kunnat kategoriseras in i. Efterfrågemönstret har tillämpats för att kunna använda rätt beräkningsmodell på rätt artikel. Beräkningsmodellen standardiserades därefter genom tillämpning av PoT för att kunna erhålla standardiserade blockstorlekar. Metoden illustrerades i ett Gantt-schema för att påvisa dess användbarhet.
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Ekberg, Julia, and Hanna Madani. "Optimering av tillverkningskvantiteter." Thesis, Högskolan i Gävle, Avdelningen för Industriell utveckling, IT och Samhällsbyggnad, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-20949.
Анотація:
För att öka lönsamheten hos ett tillverkande företag är det viktigt att ha optimala tillverkningskvantiteter så att resurserna utnyttjas optimalt. Hur ett tillverkande företag utnyttjar produktionen påverkar effektiviteten i produktionssystemet, lagret och hos personalen. Syftet med denna studie är att hitta en metod för att optimera tillverkningskvantiteter så att kostnaden per produkt blir så låg som möjligt. I denna studie har vi använt oss av företagets distributör i Indien som ett exempel för hur en manuell produktion ser ut i dagslägen och jämför hur kostnaderna skulle se ut om denna produktion skulle ske maskinellt. Arbetet är en fallstudie där tillverkningskvantiteter analyseras. Både kvalitativ och kvantitativ forskning har bedrivits för att få en djupare förståelse av problemet. I arbetet ingår bland annat teorier som rör lager, partiformning och kostnader som rör tillverkning och orderhantering. Ett antal observationer och intervjuer har utförts för att för att få en djupare inblick i tillverkning och hantering av produkter hos företag. Empirisk data som nämns är beskrivningar av företagets produktionssystem och lager. Denna studie resulterar i att ”företag” bör använda partiformningsmetoden "Ekonomisk orderkvantitet" för optimering av tillverkningskvantiteter. Metoden går ut på att balansera ordersärkostnader och lagerhållningskostnader. Är dessa kostnader likvärdiga uppnås den mest kostnadseffektiva tillverkningskvantiteten. Studien har resulterat i en lathund där den mest optimala tillverkningskvantiteten presenteras beroende på produktefterfrågan per år. En analys av distributören Indiens order resulterar i att ”företag” bör producera ordrar likt Indiens beställningar maskinellt istället för omarbetning manuellt vilket sker i dagsläget. Redan vid en tillverkningskvantitet på 120 produkter är maskinell bearbetning mest kostnadseffektivt jämfört med en manuell ombearbetning.
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Martin, Petitfrere. "EOS based simulations of thermal and compositional flows in porous media." Thesis, Pau, 2014. http://www.theses.fr/2014PAUU3036/document.
Анотація:
Les calculs d'équilibres à triphasiques et quadriphasiques sont au cœur des simulations de réservoirs impliquant des processus de récupérations tertiaires. Dans les procédés d'injection de gaz ou de vapeur, le système huile-gaz est enrichi d'une nouvelle phase qui joue un rôle important dans la récupération de l'huile en place. Les calculs d'équilibres représentent la majeure partie des temps de calculs dans les simulations de réservoir compositionnelles où les routines thermodynamiques sont appelées un nombre conséquent de fois. Il est donc important de concevoir des algorithmes qui soient fiables, robustes et rapides. Dans la littérature peu de simulateurs basés sur des équations d'état sont applicables aux procédés de récupération thermique. A notre connaissance, il n'existe pas de simulation thermique complètement compositionnelle de ces procédés pour des cas d'applications aux huiles lourdes. Ces simulations apparaissent essentielles et pourraient offrir des outils améliorés pour l’étude prédictive de certains champs. Dans cette thèse, des algorithmes robustes et efficaces de calculs d’équilibre multiphasiques sont proposés permettant de surmonter les difficultés rencontrés durant les simulations d'injection de vapeur pour des huiles lourdes. La plupart des algorithmes d'équilibre de phases sont basés sur la méthode de Newton et utilisent les variables conventionnelles comme variables indépendantes. Dans un premier temps, des améliorations de ces algorithmes sont proposées. Les variables réduites permettent de réduire la dimensionnalité du système de nc (nombre de composants) dans le cas des variables conventionnelles, à M (M<Three to four phase equilibrium calculations are in the heart of tertiary recovery simulations. In gas/steam injection processes, additional phases emerging from the oil-gas system are added to the set and have a significant impact on the oil recovery. The most important computational effort in many chemical process simulators and in petroleum compositional reservoir simulations is required by phase equilibrium and thermodynamic property calculations. In field scale reservoir simulations, a huge number of phase equilibrium calculations is required. For all these reasons, the algorithms must be robust and time-saving. In the literature, few simulators based on equations of state (EoS) are applicable to thermal recovery processes such as steam injection. To the best of our knowledge, no fully compositional thermal simulation of the steam injection process has been proposed with extra-heavy oils; these simulations are essential and will offer improved tools for predictive studies of the heavy oil fields. Thus, in this thesis different algorithms of improved efficiency and robustness for multiphase equilibrium calculations are proposed, able to handle conditions encountered during the simulation of steam injection for heavy oil mixtures. Most of the phase equilibrium calculations are based on the Newton method and use conventional independent variables. These algorithms are first investigated and different improvements are proposed. Michelsen’s (Fluid Phase Equil. 9 (1982) 21-40) method for multiphase-split problems is modified to take full advantage of symmetry (in the construction of the Jacobian matrix and the resolution of the linear system). The reduction methods enable to reduce the space of study from nc (number of components) for conventional variables to M (M<
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Liang, Tzu-Wen, and 梁子文. "Applying EIQ Technique to formulate the differential inventory policies of a Distribution Center." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/333pcg.
Анотація:
碩士朝陽科技大學
工業工程與管理系碩士班
94
Numerous items, small order, and frequent delivery are the characteristic of small and medium sized urban distribution centers. Such characteristics generally increase the operating costs of the distribution center. To remedy this problem, this study suggests differentiate the service levels of different products according to the importance of the customer to reduce the inventory costs. This study employs the Entry-Item-Quantity (EIQ) method, which was proposed by Suzuki. Sin, to identify the characteristic of a distribution center, and further analyzes the importance degree of customers and the frequently ordered products. By differentiating customer values and product values, different service levels are applied to different products based on their importance degrees. Differential (s, S) inventory policies are then formulated accordingly. With such differential inventory policies, we expect to reduce the inventory costs of the distribution center. The proposed approach is illustrated by a case study.
Книги з теми "EOQ formula":
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Liao, Guisheng. Yao shan EQ: San fen zhong xue hui jian kang Zhong yi shu. 8th ed. Taibei Xian Xindian Shi: Mei meng cheng zhen wen hua shi yeh yu xian gong si, 1997.
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Frye, Joan Marie. Sub-doppler infrared laser spectroscopy: Symmetry breakdown in tetrahedral molecules and vibrational dependence of eqQ in [formula]. 1985.
Частини книг з теми "EOQ formula":
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Vidal-Carreras, Pilar I., Jose P. Garcia-Sabater, Maria Valero-Herrero, and Cristina Santandreu-Mascarell. "Estimating Costs in the EOQ Formula." In Lecture Notes in Management and Industrial Engineering, 175–82. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04705-8_20.
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Pradhan, Sudip, Birendra Bajracharya, Kiran Shakya, and Bikram Shakya. "Geospatial Information Technology for Information Management and Dissemination." In Earth Observation Science and Applications for Risk Reduction and Enhanced Resilience in Hindu Kush Himalaya Region, 251–67. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-73569-2_13.
Анотація:
AbstractOver the last few decades, the development of geospatial technologies has converged with a variety of formal information technology disciplines (Zwartjes in Eur J Geogr 9(4):138–151, 2018; Jackson and Schell in Directions Magazine, 2009). The rapidly growing location-based services seamlessly integrate data and technologies from Earth observation (EO), Geographic Information System (GIS), Geographic Position System (GPS), and wireless and mobile communications (Huang et al. in J Location Based Servi 12(2):63–93, 2018).
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Rudalevige, Andrew. "Bargaining with the Bureaucracy." In By Executive Order, 25–48. Princeton University Press, 2021. http://dx.doi.org/10.23943/princeton/9780691194363.003.0002.
Анотація:
This chapter builds on the brief discussion from the previous chapter to explore the strands of public administration scholarship stressing the organizational complexity of the executive branch and the difficulty of imposing centralized leadership upon it. It considers the transaction costs involved in managing the executive branch — and seeks to situate presidents as they both respond to the administrative products of the agencies and create their own within the Executive Office of the President (EOP). The notion of contingent centralization, used in other research on policy formulation, is adapted here to the president's decision to “make or buy” a given executive order. What characteristics of an order, or an agency, shape presidential decisions about where to formulate an executive order? When will EOP intervention be most required; when will agencies be given freer rein? The vantage is largely presidential here in asking how presidents can lower their managerial transaction costs. But that frame allows for agencies to have influence over the provision of information and thus scope to shape presidents' cost-benefit analysis.
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Enoki, Toshiaki, Morinobu Endo, and Masatsugu Suzuki. "Electron Transport Properties." In Graphite Intercalation Compounds and Applications. Oxford University Press, 2003. http://dx.doi.org/10.1093/oso/9780195128277.003.0008.
Анотація:
In GICs, charge transfer between graphite and intercalate produces a large concentration of charge carriers, featuring an electron or hole nature in donor or acceptor GICs, respectively, as discussed in Chapter 5. GICs are therefore metallic, in contrast with the semi-metallic properties of host graphite. The typical inplane conductivity values for GICs are in the range of ~ 105 Ω−1 cm−1, which is one order of magnitude larger than the in-plane conductivity of pristine graphite (Delhaes, 1977). It is well known that the conductivity of some GICs, such as AsF5, exceeds that of copper, suggesting the properties of synthetic metals (Vogel et al., 1977). As discussed in Chapter 5, GICs have two-dimensional (2D) features in the electronic properties inherent to their stacking structure, so that electron transport is considerably anisotropic between in-plane and interplane electron conduction processes. In the in-plane process, conduction electrons, whose concentration is estimated from eq (5.9), contribute to the coherent electron conduction, and the electrical conductivity σa or resistivity ρa is described as follows (Drude formula): . . .σa =1/ρa = Neμ= Ne2τ/(m*). . . . . .(6.1). . . where N, μ, τ, and m* are the density, mobility, relaxation time, and effective mass of the conduction carriers (electrons or holes), respectively.
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Zalasiewicz, Jan, and Mark Williams. "Earth as a Snowball." In The Goldilocks Planet. Oxford University Press, 2012. http://dx.doi.org/10.1093/oso/9780199593576.003.0008.
Анотація:
Our attempts to reconstruct the climate of the distant Archaean in Chapter 1 might seem a little like reading a volume of Tolstoy’s War and Peace recovered from a burnt-out house. Most of the pages have turned to ash, and only some scattered sentences remain on a few charred pages. The Proterozoic Eon that followed began 2.5 billion years ago, thus is not quite so distant from us in time. We know it a little better than the Archaean—at least a handful of pages from its own book have survived. And this book is long—the Proterozoic lasted nearly two billion years. This is as long as the Hadean and Archaean together, and not far short of half of Earth’s history. Like many a soldier’s account of war, it combined long periods of boredom and brief intervals of terror—or their climatic equivalents, at least. The latter included the most intense glaciations that ever spread across the Earth. Some of these may have converted the planet into one giant snowball. The earliest traces of glaciation on Earth are seen even before the Proterozoic, in rock strata of Archaean age, 2.9 billion years old, near the small South African town of Pongola. These rocks include sedimentary deposits called tillites, which are essentially a jumble of rock fragments embedded in finer sediment. The vivid, old-fashioned term for such deposits is ‘boulder clays’, while the newer and more formal name is ‘till’ for a recent deposit and ‘tillite’ for the hardened, ancient version. Many of the ancient blocks and boulders in the tillites of Pongola are grooved and scratched—a tell-tale sign that they have been dragged along the ground by debris-rich ice. This kind of evidence is among the first ever employed by scientists of the mid-nineteenth century, such as Louis Agassiz and William Buckland, to tell apart ice-transported sediments from superficially similar ones that had formed as boulder-rich slurries when rivers flooded or volcanoes erupted. Ice, then, appeared on Earth in Archaean times.
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Kobayashi, Shiro, Soo-Ik Oh, and Taylan Altan. "The Finite-Element Method—Part I." In Metal Forming and the Finite-Element Method. Oxford University Press, 1989. http://dx.doi.org/10.1093/oso/9780195044027.003.0009.
Анотація:
The concept of the finite-element procedure may be dated back to 1943 when Courant approximated the warping function linearly in each of an assemblage of triangular elements to the St. Venant torsion problem and proceeded to formulate the problem using the principle of minimum potential energy. Similar ideas were used later by several investigators to obtain the approximate solutions to certain boundary-value problems. It was Clough who first introduced the term “finite elements” in the study of plane elasticity problems. The equivalence of this method with the well-known Ritz method was established at a later date, which made it possible to extend the applications to a broad spectrum of problems for which a variational formulation is possible. Since then numerous studies have been reported on the theory and applications of the finite-element method. In this and next chapters the finite-element formulations necessary for the deformation analysis of metal-forming processes are presented. For hot forming processes, heat transfer analysis should also be carried out as well as deformation analysis. Discretization for temperature calculations and coupling of heat transfer and deformation are discussed in Chap. 12. More detailed descriptions of the method in general and the solution techniques can be found in References [3-5], in addition to the books on the finite-element method listed in Chap. 1. The path to the solution of a problem formulated in finite-element form is described in Chap. 1 (Section 1.2). Discretization of a problem consists of the following steps: (1) describing the element, (2) setting up the element equation, and (3) assembling the element equations. Numerical analysis techniques are then applied for obtaining the solution of the global equations. The basis of the element equations and the assembling into global equations is derived in Chap. 5. The solution satisfying eq. (5.20) is obtained from the admissible velocity fields that are constructed by introducing the shape function in such a way that a continuous velocity field over each element can be denned uniquely in terms of velocities of associated nodal points.
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Thomas, Michael E. "Spectroscopy of Matter." In Optical Propagation in Linear Media. Oxford University Press, 2006. http://dx.doi.org/10.1093/oso/9780195091618.003.0007.
Анотація:
It is critical to understand the nature of the propagation medium in terms of the available resonances which couple to the electromagnetic field. The detailed specification of the complex index of refraction as a function of frequency is the subject of spectroscopy. Since propagation media cover all phases of matter, the spectroscopy of gases, solids, and liquids is introduced in this chapter. Topics are not exhaustively covered, but rather with sufficient depth to support the practical applications that will come later. The chapter begins with a formal review of topics covered in stationary-state quantum mechanics necessary for the development of spectroscopy. The next section develops models to calculate spectral line positions, which are necessary to characterize a spectral line. The full development of spectral line parameters is not only the goal of this chapter but the next two as well. The remaining sections address the essential elements of the spectroscopy of gases, solids and liquids. Both classical and quantum models are used. Time-independent quantum mechanics allows the description of the quantized energy level structure of matter. This is the central topic of this chapter. Time-dependent quantum mechanics is necessary for the development of a theory covering transitions between stationary-state energy levels and is the topic of Chapter 5. The classical concept of light is that of an oscillating continuous wave field, as presented in the first two chapters. This is consistent with the classical electrodynamics based on Maxwell’s equations. However, the work by Planck on blackbody radiation and Einstein on the photoelectric effect showed that optical fields also have a quantized or particle-like nature. Planck, in 1900, suggested that the energy of light, E, be quantized according to . . . E = h f [J] (3.1) . . . where f is frequency (sec−1) and h is Planck’s constant (h = 6.6260755(40) × 10−34 J-sec). This allowed a theoretical description of blackbody radiation for the first time. However, it was Einstein, who, a few years later, made Eq. 3.1 more credible by applying it to explain the photoelectric effect.
Тези доповідей конференцій з теми "EOQ formula":
1
Mohammadi, Hossein, Raymond Cartier, and Rosaire Mongrain. "Development of a 1D Model for Assessing the Aortic Root Pressure Drop With Viscosity and Compliance." In ASME 2013 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/sbc2013-14749.
Анотація:
Aging and some pathologies such as arterial hypertension, diabetes, hyperglycemia, and hyperinsulimenia cause some geometrical and mechanical changes in the aortic valve microstructure. Cupsal thickening and lost of extensibility (increasing stiffness) are the consequences of these changes in the aortic valve which have a negative impact on the function of the valve [1]. The most frequent form of diseases of the aortic valve is the calcific aortic stenosis which is responsible for 80% of the North American deaths due to valvular heart diseases [2]. In this pathology, calcified nodules on the valve leaflets occur which lead to the thickening and stiffening of the leaflets and restricting the natural motion of the valve which presents an increased resistance to forward blood flow during the ejection phase of the cardiac cycle. To reduce the mortality and morbidity from the aortic stenosis, clinical management and proper diagnosis are essential [3]. Tranvalvular pressure gradient (TPG) and the effective orifice area (EOA), the minimum cross sectional area of the blood flow across the stenosis, are the most commonly used indices for assessing the aortic stenosis [4]. Numerous studies have been done to relate the TPG across the stenosis to the blood flow rate and EOA. Gorlin (1951) was the first to establish a relationship between TPG and EOA [5]. Several studies have reported deviations in valve area calculation by using Gorlin formula. This formula was derived based on some assumptions such as rigid circular orifice, non viscous and steady flow, while valvular orifices are compliant and the flow through them is viscous and pulsatile [6]. Several corrections have been proposed. However, even with these improved formula, significant deviations are still reported [7]. Calark (1978), Bermejo et al (2002) and Garcia et al (2006), by presenting a theoretical model, tried to express TPG in terms of the blood flow rate and EOA [8–10]. None of these studies considered the effect of the aortic root compliance on TPG. Nobari et al reported that the stiffening of the aorta changes the pressure drop and affects the leaflets motion [11]. Therefore, the objective of this study is to develop a 1D model for assessing the aortic pressure drop for the transient viscous blood flow across the aortic stenosis, by taking into account the vessel wall compliance. The derived TPG will be expressed in terms of the surrogate variables which are anatomical and hemodynamic data meaningful and accessible for physicians.
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S. Júnior, Paulo J., and André C. Drummond. "Proteção por Pré-provisionamento em Redes Ópticas Elásticas." In XVI Workshop em Desempenho de Sistemas Computacionais e de Comunicação. Sociedade Brasileira de Computação - SBC, 2017. http://dx.doi.org/10.5753/wperformance.2017.3358.
Анотація:
Com o surgimento das redes EON, as técnicas de proteção exploradas para as redes WDM são reavaliadas e a investigação por novas técnicas toma nova importância. Este trabalho objetiva explorar as principais técnicas de proteção e comparar a forma offline, pré-provisionamento, e online, provisionamento, adaptando as estratégias tomadas pela literatura para as redes EON. Este estudo explora a visão realista de se prever o tráfego e adaptar as técnicas de roteamento a essa premissa. São apresentadas heurísticas para roteamento e alocação de espectro para pré-provisionamento de proteção DLP, Proteção Dedicada por Enlace, e DPP, Proteção Dedicada por Caminho. Resultados mostram que o uso de técnicas de pré-provisionamento em EON obtém bons resultados, comparadosás soluções clássicas de provisionamento.
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Besse, Jean-Guillaume. "Derivation to Calculate Pipe Collapse Performance using a Combined Loading Equivalent Grade Accounting for Axial Stress, Internal Pressure, Bending and Torsion." In SPE/IADC International Drilling Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/204126-ms.
Анотація:
Abstract This paper proposes a new analytical derivation to incorporate bending and torsion into collapse calculation, further pushing the already existing approach of combined loading equivalent grade proposed in API TR 5C3 (2019) Clause 8.4.6 Eq. (42) for axial stress and internal pressure (identical to ISO TR 10400 Clause 8.4.7) used to calculate a differential collapse pressure. This new derivation is also based on Hencky-von Mises maximum distortion criterion. The interest of developing such combined loading equivalent grade is to enable the use of the four collapse types described in Clause 8 i.e., Yield Strength, Plastic, Transition and Elastic. The formulae are adapted to a closed-form equation similar to current Eq. (42), enabling pipe collapse performance calculation. Newly derived formulae are checked against a size governed by yield strength collapse to verify consistency. The restrictions regarding collapse performance under compression are discussed.
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Movahed, Saeid, Reza Kamali, and Mohammad Eghtesad. "Analytical Approach for Finding Velocity and Temperature Distribution of Electroosmotic Flow in Micro- and Transitional Nano-Channels." In ASME 2009 7th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2009. http://dx.doi.org/10.1115/icnmm2009-82202.
Анотація:
The past decade has seen tremendous growth in areas of micro- and nano-fluidics, and MEMs flow control. Nowadays, there is considerable interest in micro- and nano/technologies consisting of small structures in contact with liquid media. By increasing the motivations of using miniaturized devices such as MEMS and NEMS and inventing new methods of their manufacturing, the inspirations of their study and analysis have been increased more and more. One of the most important characteristics of these devices which have undeniable impacts on their performances is miniaturized-channel flow field. By decreasing the dimensions of channels, the influence of surface effects becomes prominent and cannot be ignored. One of the most charismatic categories of these phenomena is elecrokinetic effect which can results in electroosmotic flow field (EOF) that has many advantages such as being vibration free, being much more compact, having flat-form velocity and etc. These beneficiaries lead to the increasing stimulus of using this type of flow field. One of the most important disadvantages of EOF is the Joule heating effect, the generation of heat due to the electroosmosis effect. Besides, miniaturized-channels are usually used as heat sink in miniaturized devices. By considering these facts, it can be concluded that heat characteristics of EOF must be studied carefully in order to manage the Joule heating effect and to utilize the cooling characteristics of miniaturized-channels. By reviewing the studies that have been performed in this field of study, it can be concluded that there is not any analytical approaches in dealing with heat transfer of EOF in miniaturized-channels though analytical formulas are completely essential for investigating, monitoring and controlling of any systems. In this regards, having some analytical studies on heat transfer analysis of miniaturized-channel flow field is completely essential. In the present study, by using the Schwartz-Christoffel mapping, an analytical tactic will be proposed in order to find electroosmotic velocity and consequently temperature distribution of EOF in micro- and transitional nano-channels.
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de Lima e Lima, Wanessa Oliveira. "A INDUÇÃO DE ESTRESSE OXIDATIVO PELA PRÁTICA DE EXERCÍCIO AGUDO E ATUAÇÃO DO ÓLEO DE COCO EXTRA VIRGEM PARA SUAVIZAÇÃO DO PROCESSO." In I Congresso Brasileiro de Bioquímica Humana On-line. Revista Multidisciplinar em Saúde, 2021. http://dx.doi.org/10.51161/rems/669.
Анотація:
Introdução: O estresse oxidativo (EO) ocorre devido ao desequilíbrio entre compostos oxidantes e a atuação de mecanismos de defesa antioxidante. Compostos oxidantes fazem-se presentes no organismo de duas maneiras: exógena - através da dieta, ou endógena - produzido pelo próprio organismo. Tendo em vista o esforço exercido pelo organismo devido ao estímulo da atividade física, estudos apontam a elevação dos níveis de EO em atletas, sendo estes variáveis entre tipo e categoria de esporte, e idade dos mesmos. Objetivo: Avaliar o impacto da atividade física no aumento de espécies reativas de oxigênio (ERO) de forma a induzir significativamente o EO, analisando o tipo de esporte de maior influência e a faixa etária de atletas mais suscetíveis a tal acometimento. Material e métodos: A busca foi realizada em bases de dados digitais, sendo considerados artigos originais e de revisão que atendessem ao tema da pesquisa, disponíveis na íntegra e nos idiomas português, inglês e espanhol. Resultados: Com base nos dados levantados, observa-se que o exercício agudo promove um estímulo ao EO, visto que o mesmo eleva a concentração de lactato, succinato desidrogenase e a atividade de citocromo c oxidase no organismo independente da idade, enquanto os níveis de glicogênio muscular reduziram. Exercícios prolongados reduzem os níveis de glutationa, além de notar-se também que com o envelhecimento os níveis de EO sobem ainda mais, reduzindo a capacidade antioxidante e favorecendo lesões musculoesqueléticas oxidativas. Por outro lado, exercícios moderados auxiliam no controle do EO. A suplementação com óleo de coco extra virgem (OCV) por sua vez auxilia na redução de ERO, suavizando os efeitos sofridos por atletas de forma contínua. Conclusão: Desta maneira, conclui-se que o exercício agudo induz à formação de ERO tendo como consequência o EO, condição esta que pode ser suavizada com o uso de OCV.
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Tretiacova, Tatiana, Vladimir Todiras, and Ana Gusan. "Eficacitatea produsului NEEM01 în combaterea păduchilor în livezi și spaţii protejate." In International Scientific Symposium "Plant Protection – Achievements and Prospects". Institute of Genetics, Physiology and Plant Protection, Republic of Moldova, 2020. http://dx.doi.org/10.53040/9789975347204.49.
Анотація:
Considering the growing demand for organic production of food and registration-related problems, the number of pest management products that can be used in this sort of production is limited. In this study the efforts have been made to formulate the Neem oil emulsions which would be used as agrochemicals. Bioassays were performed on aphids (Myzodes persicae Sulz., Aphis gossypii Glow , Aphis pomi Deg.) in order to compare the insecticidal activity of the neem oil new preparative form NEEM-01 with that of the commercial biorational product Pelecol EO. The bioassays conducted on the aphids demonstrated that the NEEM-01 aplicated at the doze 8,0 l/ha was not effective as the commercial product Pelecol EO. But at the doze 10,0 l/ha new preparative form of neem oil has demonstrated a good biological effectiveness during 7 days after two treatments.
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Ariadji, T. "Full Field EOR Implementation of A Low Cost Surfactant Continuous Injection at Arahan-Banjarsari, South Sumatra." In Digital Technical Conference. Indonesian Petroleum Association, 2020. http://dx.doi.org/10.29118/ipa20-e-375.
Анотація:
The objective of this paper is to describe a series of laboratory work results in conjunction with successful implementation of the surfactant (micellar) continuous injection in the Muara Enim sand of the Arahan-Banjarsari Field, South Sumatra. A series of lab tests were conducted using field cores and fluids taken from the Arahan-Banjarsari (AR-BS) field. The tests included phase behavior, mixture viscosity measurement, spontaneous imbibition, and static isotherm adsorption tests. Several surfactant formulas had been tested to find the most consistent and most suitable to the reservoir conditions. The surfactant injection was started in March 2009 into three AR wells. The injection was divided into 4 stages with initial concentration of 0.45% and the final concentration of 0.1%. Total volume of micellar solution injected in 110 days was 52,365 bbls. An increase in oil production was observed not only in two AR wells but also in 8 wells in the neighboring BS field (500 meters distance) after 140 days since injection of micellar solution started with injection rates of 200-250 bpd. Two BS wells were reopened and produced 28% and 54% water cut (the water cut before the two wells were shut in was 19% and 76%). This micellar solution injection managed to decrease the decline rate of 70% to 26% per year, increase production rate from AR and BS fields from 90 bopd to a peak of 220 bopd in 5 months since injection started, and reserves enhancement of 183 M bbls (10% OOIP) during 3.5 years of continuous injection. The low cost, full scale chemical EOR leads to changes in the common understanding about micellar flooding and shows a high impact on oil recovery of 183 Mbls (AB-5c sand with OOIP of 1.8 MMSTB).
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Hasan, Nazmul. "Passenger Track Curve Design Criteria: Comfort Criteria, Equivalent Comfort Criteria, and Application." In 2011 Joint Rail Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/jrc2011-56012.
Анотація:
It is generally recognized by FRA, AREMA, Amtrak, OSHA, and many other applicable authorities that the maximum acceptable rate of radial acceleration for passengers comfort is 0.1g, where ‘g’ is 9.81 m/s/s [1]. Jerk is limited to 0.03g/s [1]. Roll is limited to 1 deg/sec. In this paper all values computed with the aforesaid standard values are referred to as the maximum desirable values as these may be exceeded if needed. Currently there is no procedure in the literature to compute the maximum desirable values. From these comfort criteria the formulae for superelevation run off, rate of change of curvature, radius, and spiral angle etc. are derived. Applications of these formulae and further potential applications thereof are presented. This study is intended for conventional non-tilting train. The equilibrium (Eq), actual (Ea), and unbalance superelevation (Eu) run-off are calculated to be 45 mm/sec, 26 mm/sec and 19 mm/sec respectively. From the run-off rates, the maximum desirable actual and unbalance superlevation comes out to be 87 mm and 63 mm respectively. The desirable ratio between unbalance and actual super-elevation comes to be 0.72. This helps in proportioning equilibrium superelevation to ensure comfort. Equations of spiral length are derived by proportioning 3.33 sec’s ride with the maximum desirable values of superelevation and these equations are found to be exactly the same as those derived another way in the paper no. JRC 2010-36050.
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Joseph, Aaron T., James H. Schreiner, and Deborah Thurston. "Design Decision Tradeoffs for Environmental Impact and End of Life Recovery of Cellphones." In ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-46769.
Анотація:
Tradeoff decision making is a difficult problem in design, and even more so when designing for the product lifecycle. Tradeoffs must be made among a broader set of issues, including environmental impact. In addition, normative methods such as utility analysis can become more difficult to implement because of decision modeling issues. This paper presents formal, normative methods for overcoming these difficulties. The method includes a lifecycle analysis which reveals elements of the cellphone design that are most impactful on the environment. A baseline estimate of impacts provides insight into possible redesign options based on minimization of negative environmental impacts. The proposed method also employs a multiattribute utility copula approach, which can be useful when the condition of utility independence is not easily satisfied when formulating a multiattribute utility function. An example using the decision process for end of life (EOL) processing alternatives for cellphones illustrates the method. The extraction of sub-assemblies was determined to be the best decision alternative to recapture value at the disposal stage of the product lifecycle. The copula structure is shown to be effective in analyzing a firm’s tradeoff preferences as well as attribute valuation, providing a straightforward tool for tradeoff decision making.
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Zhu, Bicheng, and Utpal Roy. "Towards a Semantic Web Approach for Disassembly Planning." In ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/detc2014-34793.
Анотація:
Disassembly, as one of the core steps in the End of Life (EOL) activities, has been a popular topic of research in both industrial and academic areas. It not only reduces product lifecycle cost, but also substantially influences environmental impact. Although different methods have been proposed for tackling different aspects of the disassembly planning problems, certain gaps still exist. For example, in the case of the disassembly sequencing, traditional methods focus mainly on the geometry and topology constraints, but omit the important technical constraints like force (gravity), connector type, etc.; it makes these methods less efficient and realistic. Also, the determination of an optimal disassembly sequence requires an extensive exchange and sharing of the disassembly related knowledge among the different stakeholders like manufacturers, product designers, maintenance staffs and material engineers. A mechanism to support such information interoperability is important in the disassembly process. In order to address those research issues, this paper proposes a Semantic Web based Disassembly Planning Framework. In the framework, the proposed “Disassembly Core Ontology” (DCO) serves as a formal, explicit information core for different users like product designer and disassembler. By exploiting the rich semantic knowledge (like gravity, connector type, etc.) that has been explicitly embedded in the proposed DCO, it has been demonstrated that the semantic web approach has potentials to address both efficiency- and interoperability-related issues in disassembly planning problems.
Звіти організацій з теми "EOQ formula":
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Gaetano, Mark. Implementation of the New Wholesale EOQ Safety Level Formula. Fort Belvoir, VA: Defense Technical Information Center, August 1988. http://dx.doi.org/10.21236/ada199110.