Готові списки джерел за темами / KSS Bound

Добірка наукової літератури з теми "KSS Bound"

Автор: Grafiati

Опубліковано: 22 червня 2021

Оновлено: 2 лютого 2022

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Статті в журналах з теми "KSS Bound":

Chirco, G., C. Eling, and S. Liberati. "Non-equilibrium Spacetime Thermodynamics, Entanglement viscosity and KSS bound." Journal of Physics: Conference Series 314 (September 22, 2011): 012033. http://dx.doi.org/10.1088/1742-6596/314/1/012033.

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Sadeghi, Mehdi. "Black brane solution in Rastall AdS massive gravity and viscosity bound." Modern Physics Letters A 33, no. 37 (December 5, 2018): 1850220. http://dx.doi.org/10.1142/s0217732318502206.

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In this paper, we introduced the black brane solution in Rastall theory and in the context of massive gravity. The ratio of shear viscosity to entropy density is calculated for this solution. Our result shows that the KSS bound violates this theory.

Sadeghi, Mehdi. "AdS black brane solution surrounded by quintessence in massive gravity and KSS bound." Modern Physics Letters A 36, no. 28 (September 14, 2021): 2150202. http://dx.doi.org/10.1142/s0217732321502023.

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In this paper, the Einstein AdS black brane solution in the presence of quintessence in context of massive gravity is introduced. The ratio of shear viscosity to entropy density for this solution violates the KSS bound by applying the Dirichlet boundary and regularity conditions on the horizon for [Formula: see text]. Our result shows that this value is independent of quintessence in any arbitrary dimensions.

Dobado, A., and F. J. Llanes-Estrada. "On the violation of the holographic viscosity versus entropy KSS bound in non-relativistic systems." European Physical Journal C 51, no. 4 (August 2007): 913–18. http://dx.doi.org/10.1140/epjc/s10052-007-0332-5.

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Dobado, A., and F. J. Llanes-Estrada. "The ratio of viscosity to entropy density in a pion gas satisfies the KSS holographic bound." European Physical Journal C 49, no. 4 (January 11, 2007): 1011–13. http://dx.doi.org/10.1140/epjc/s10052-006-0176-4.

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SHOU, Magang, Qin MEI, JR Michael W. ETTORE, Renke DAI, Thomas A. BAILLIE, and Thomas H. RUSHMORE. "Sigmoidal kinetic model for two co-operative substrate-binding sites in a cytochrome P450 3A4 active site: an example of the metabolism of diazepam and its derivatives." Biochemical Journal 340, no. 3 (June 8, 1999): 845–53. http://dx.doi.org/10.1042/bj3400845.

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Cytochrome P450 3A4 (CYP3A4) plays a prominent role in the metabolism of a vast array of drugs and xenobiotics and exhibits broad substrate specificities. Most cytochrome P450-mediated reactions follow simple Michaelis-Menten kinetics. These parameters are widely accepted to predict pharmacokinetic and pharmacodynamic consequences in vivo caused by exposure to one or multiple drugs. However, CYP3A4 in many cases exhibits allosteric (sigmoidal) characteristics that make the Michaelis constants difficult to estimate. In the present study, diazepam, temazepam and nordiazepam were employed as substrates of CYP3A4 to propose a kinetic model. The model hypothesized that CYP3A4 contains two substrate-binding sites in a single active site that are both distinct and co-operative, and the resulting velocity equation had a good fit with the sigmoidal kinetic observations. Therefore, four pairs of the kinetic estimates (KS1, kα, KS2, kβ, KS3, k∆, KS4 and kγ) were resolved to interpret the features of binding affinity and catalytic ability of CYP3A4. Dissociation constants KS1 and KS2 for two single-substrate-bound enzyme molecules (SE and ES) were 3-50-fold greater than KS3 and KS4 for a two-substrate-bound enzyme (SES), while respective rate constants k∆ and kγ were 3-218-fold greater than kα and kβ, implying that access and binding of the first molecule to either site in an active pocket of CYP3A4 can enhance the binding affinity and reaction rate of the vacant site for the second substrate. Thus our results provide some new insights into the co-operative binding of two substrates in the inner portions of an allosteric CYP3A4 active site.

Chen, Yuansi. "An Almost Constant Lower Bound of the Isoperimetric Coefficient in the KLS Conjecture." Geometric and Functional Analysis 31, no. 1 (February 2021): 34–61. http://dx.doi.org/10.1007/s00039-021-00558-4.

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AbstractWe prove an almost constant lower bound of the isoperimetric coefficient in the KLS conjecture. The lower bound has the dimension dependency $$d^{-o_d(1)}$$ d - o d ( 1 ) . When the dimension is large enough, our lower bound is tighter than the previous best bound which has the dimension dependency $$d^{-1/4}$$ d - 1 / 4 . Improving the current best lower bound of the isoperimetric coefficient in the KLS conjecture has many implications, including improvements of the current best bounds in Bourgain’s slicing conjecture and in the thin-shell conjecture, better concentration inequalities for Lipschitz functions of log-concave measures and better mixing time bounds for MCMC sampling algorithms on log-concave measures.

Benevides, Fabricio Siqueira, and Małgorzata Sulkowska. "Percolation and best-choice problem for powers of paths." Journal of Applied Probability 54, no. 2 (June 2017): 343–62. http://dx.doi.org/10.1017/jpr.2017.4.

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AbstractThe vertices of thekth power of a directed path withnvertices are exposed one by one to a selector in some random order. At any time the selector can see the graph induced by the vertices that have already appeared. The selector's aim is to choose online the maximal vertex (i.e. the vertex with no outgoing edges). We give upper and lower bounds for the asymptotic behaviour ofpn,kn1/(k+1), wherepn,kis the probability of success under the optimal algorithm. In order to derive the upper bound, we consider a model in which the selector obtains some extra information about the edges that have already appeared. We give the exact asymptotics of the probability of success under the optimal algorithm in this case. In order to derive the lower bound, we analyse a site percolation process on a sequence of thekth powers of a directed path withnvertices.

Warrilow, Andrew G., Josie E. Parker, Diane E. Kelly та Steven L. Kelly. "Azole Affinity of Sterol 14α-Demethylase (CYP51) Enzymes from Candida albicans and Homo sapiens". Antimicrobial Agents and Chemotherapy 57, № 3 (28 грудня 2012): 1352–60. http://dx.doi.org/10.1128/aac.02067-12.

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ABSTRACTCandida albicansCYP51 (CaCYP51) (Erg11), full-lengthHomo sapiensCYP51 (HsCYP51), and truncated Δ60HsCYP51 were expressed inEscherichia coliand purified to homogeneity. CaCYP51 and both HsCYP51 enzymes bound lanosterol (Ks, 14 to 18 μM) and catalyzed the 14α-demethylation of lanosterol usingHomo sapienscytochrome P450 reductase and NADPH as redox partners. Both HsCYP51 enzymes bound clotrimazole, itraconazole, and ketoconazole tightly (dissociation constants [Kds], 42 to 131 nM) but bound fluconazole (Kd, ∼30,500 nM) and voriconazole (Kd, ∼2,300 nM) weakly, whereas CaCYP51 bound all five medical azole drugs tightly (Kds, 10 to 56 nM). Selectivity for CaCYP51 over HsCYP51 ranged from 2-fold (clotrimazole) to 540-fold (fluconazole) among the medical azoles. In contrast, selectivity for CaCYP51 over Δ60HsCYP51 with agricultural azoles ranged from 3-fold (tebuconazole) to 9-fold (propiconazole). Prothioconazole bound extremely weakly to CaCYP51 and Δ60HsCYP51, producing atypical type I UV-visible difference spectra (Kds, 6,100 and 910 nM, respectively), indicating that binding was not accomplished through direct coordination with the heme ferric ion. Prothioconazole-desthio (the intracellular derivative of prothioconazole) bound tightly to both CaCYP51 and Δ60HsCYP51 (Kd, ∼40 nM). These differences in binding affinities were reflected in the observed 50% inhibitory concentration (IC50) values, which were 9- to 2,000-fold higher for Δ60HsCYP51 than for CaCYP51, with the exception of tebuconazole, which strongly inhibited both CYP51 enzymes. In contrast, prothioconazole weakly inhibited CaCYP51 (IC50, ∼150 μM) and did not significantly inhibit Δ60HsCYP51.

von Wettstein-Knowles, P., J. Gotthardt Olsen, K. Arnvig McGuire та S. Larsen. "Molecular aspects of β-ketoacyl synthase (KAS) catalysis". Biochemical Society Transactions 28, № 6 (1 грудня 2000): 601–7. http://dx.doi.org/10.1042/bst0280601.

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Crystal structure data for Escherichia coli β-ketoacyl synthase (KAS) I with C10 and C12 fatty acid substrates bound in conjunction with results from mutagenizing residues in the active site leads to a model for catalysis. Differences from and similarities to the other Claisen enzymes carrying out decarboxylations reveal two catalytic mechanisms, one for KAS I and KAS II, the other for KAS III and chalcone synthase. A comparison of the structures of KAS I and KAS II does not reveal the basis of chain-length specificity. The structures of the Arabidopsis thaliana KAS family are compared.

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Дисертації з теми "KSS Bound":

Martin, Luke. "Viscosity Bound Violation in the MTZ Black Hole:." Thesis, Boston College, 2021. http://hdl.handle.net/2345/bc-ir:109169.

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Thesis advisor: Kevin Bedell
Using the AdS/CFT correspondence, it has been shown that the ratio of shear viscosity to entropy density is bounded from below in strongly coupled field theories with a gravity dual. More recently, this bound has been shown to be grossly violated in novel non-Fermi liquids and the unitary Fermi gas in the presence of superfluid fluctuations above T_c. Nevertheless, a holographic approach to such systems which break the lower bound have been strongly reliant on AdS spacetimes with massive gravitons. In this work, we propose a violation of the viscosity over entropy bound in 3+1 dimensional AdS spacetimes that support stable black hole solutions with non-zero scalar field. Such a black hole is shown to be characterized by a novel phase transition at large negative mass, where the underlying thermodynamics agrees with the Larkin-Ovchinnikov-Fulde-Ferrell (LOFF)-like phase seen in the unitary Fermi gas near Tc and the bound is similarly broken. Such a work paves the way for a holographic description of strongly-entangled quantum fluids at high Reynolds number
Thesis (BS) — Boston College, 2021
Submitted to: Boston College. College of Arts and Sciences
Discipline: Scholar of the College
Discipline: Physics

Книги з теми "KSS Bound":

Alan, Barnes. Kiss Kiss Bang! Bang!: The unofficial James Bond film companion. 2nd ed. London: Batsford, 2000.

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Alan, Barnes. Kiss kiss bang bang: The unofficial James Bond film companion. London: BT Batsford, 1997.

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Alan, Barnes. Kiss, kiss, bang, bang!: The unofficial James Bond film companion. Woodstock, NY: Overlook Press, 1998.

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Tesche, Siegfried. "Mr. Kiss Kiss Bang Bang": Die Geschichte der James-Bond-Filmmusiken. Mainz: Schott, 2006.

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Maney, Mabel. Kiss the girls and make them spy: An original Jane Bond parody. New York: HarperEntertainment, 2001.

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BC Red (KS2) +/5A Island Bound GRC. Pearson Education, Limited, 2013.

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Springer, Jan. A Hero's Kiss (Pleasure Bound) (Volume 4). CreateSpace Independent Publishing Platform, 2017.

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Hearn, Marcus. Kiss Kiss Bang Bang: The Secret History of James Bond. Overlook TP, 1998.

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Barnes, Alan, and Marcus Hearn. Kiss Kiss Bang! Bang!: The Unoffical James Bond 007 Film Companion. 2nd ed. Batsford, 2003.

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Gaston, Diane, Kathryn Albright, and Preston Janice. Harlequin Historical December 2016 - Box Set 1 of 2: Christmas Kiss from the Sheriff / Bound by a Scandalous Secret / The Governess's Secret Baby. Harlequin Enterprises, Limited, 2016.

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Частини книг з теми "KSS Bound":

Bruening, Michael W. "Conclusion." In Refusing to Kiss the Slipper, 299–310. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780197566954.003.0010.

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The book’s conclusion demonstrates the extent to which the various anti-Calvinist networks overlapped, showing that there was a truly international web of opposition to Calvinism among francophone evangelicals. What chiefly bound them together was hatred of Calvin (and/or Beza), opposition to the execution of Servetus, and disgust at Calvin’s assumption of uncompromising religious authority. This section offers some preliminary explanations for the Calvinists’ ultimate victory, pointing to their dominance of major cities, printing presses, educational institutions, and synods, as well as to their concerted propaganda campaigns against their enemies and their insistence on unambiguous doctrinal statements. Those treated in this book, by contrast, challenged religious authority but mostly failed to establish religious communities. As such, they can be seen as the earliest practitioners of modern theologian Paul Tillich’s “Protestant Principle.”

Тези доповідей конференцій з теми "KSS Bound":

Dobado, Antonio, Felipe J. Llanes-Estrada, Juan Miguel Torres Rincón, José D. Edelstein, Nicolás Grandi, Carmen Núñez, and Martin Schvellinger. "The Status of the KSS Bound and its Possible Violations (How Perfect Can a Fluid Be?)." In TEN YEARS OF ADS∕CFT. AIP, 2008. http://dx.doi.org/10.1063/1.2972009.

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Shi, Yuxuan, Gong Cheng, Trung-Kien Tran, Jie Tang, and Evgeny Kharlamov. "Keyword-Based Knowledge Graph Exploration Based on Quadratic Group Steiner Trees." In Thirtieth International Joint Conference on Artificial Intelligence {IJCAI-21}. California: International Joint Conferences on Artificial Intelligence Organization, 2021. http://dx.doi.org/10.24963/ijcai.2021/215.

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Exploring complex structured knowledge graphs (KGs) is challenging for non-experts as it requires knowledge of query languages and the underlying structure of the KGs. Keyword-based exploration is a convenient paradigm, and computing a group Steiner tree (GST) as an answer is a popular implementation. Recent studies suggested improving the cohesiveness of an answer where entities have small semantic distances from each other. However, how to efficiently compute such an answer is open. In this paper, to model cohesiveness in a generalized way, the quadratic group Steiner tree problem (QGSTP) is formulated where the cost function extends GST with quadratic terms representing semantic distances. For QGSTP we design a branch-and-bound best-first (B3F) algorithm where we exploit combinatorial methods to estimate lower bounds for costs. This exact algorithm shows practical performance on medium-sized KGs.

Xu, Hongqing, Nathan Palm, and Anees Udyawar. "Technical Basis for Expansion of ASME BPVC Section XI, KIC Curve Applicability." In ASME 2019 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/pvp2019-93988.

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Abstract When the Appendix G methodology, fracture toughness criteria for protection against failure, was first adopted by ASME Section III in 1972, it included a lower-bound Kir curve for ferritic steels with specified minimum room-temperature yield strength up to 50 ksi. In 1977, Section III Appendix G added a requirement to obtain fracture-toughness data for at least three heats (base metal, weld metal, and heat-affected zone) if the KIR curve is used for ferritic steels with specified minimum room-temperature yield strength between 50 and 90 ksi. The three-heat data requirement has not changed when the lower bound curve was adopted by Section XI, or when the lower-bound crack initiation toughness curve was changed from the dynamic Kir curve to the static KIc curve during the 2000s. Based on the accumulation of fracture-mechanics data of ferritic steels with specified minimum yield strength between 50 ksi and 90 ksi and their use for Class 1 pressure vessel production, Section XI recently expanded the applicability of the KIc curve to SA-508 Grade 2 Class 2, SA-508 Grade 3 Class 2, SA-533 Type A Class 2, and SA-533 Type B Class 2 whose specified minimum room-temperature yield strength is 65 ksi or 70 ksi. This paper describes the technical basis including the fracture-mechanics data to support the expansion of the applicability of the KIc curve by ASME Section XI.

Lee, Yin Tat, and Santosh Srinivas Vempala. "Eldan's Stochastic Localization and the KLS Hyperplane Conjecture: An Improved Lower Bound for Expansion." In 2017 IEEE 58th Annual Symposium on Foundations of Computer Science (FOCS). IEEE, 2017. http://dx.doi.org/10.1109/focs.2017.96.

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Yu, Hailing, and David Jeong. "Finite Element Bond Modeling for Indented Wires in Pretensioned Concrete Crossties." In 2016 Joint Rail Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/jrc2016-5782.

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Indented wires have been increasingly employed by concrete crosstie manufacturers to improve the bond between prestressing steel reinforcements and concrete, as bond can affect several critical performance measures, including transfer length, splitting propensity and flexural moment capacity of concrete ties. While extensive experimental testing has been conducted at Kansas State University (KSU) to obtain bond characteristics of about a dozen commonly used prestressing wires, this paper develops macro-scale or phenomenological finite element bond models for three typical wires with spiral or chevron indent patterns. The steel wire-concrete interface is homogenized and represented with a thin layer of cohesive elements sandwiched between steel and concrete elements. The cohesive elements are assigned traction-displacement constitutive or bond relations that are defined in terms of normal and shear stresses versus interfacial dilatation and slip within the elasto-plastic framework. A yield function expressed in quadratic form of shear stress and linear form of normal stress is adopted. The yield function takes into account the adhesive mechanism and hardens in the post-adhesive stage. The plastic flow rule is defined such that the plastic dilatation evolves with the plastic slip. The mathematical forms of the yield and plastic flow functions are the same for all three wire types, but the bond parameters are specific for each wire. The adhesive, hardening and dilatational bond parameters are determined for each wire type based on untensioned pullout tests and pretensioned prism tests conducted at KSU. Simulation results using these bond models are further verified with surface strain data measured on actual concrete crossties made with the three respective prestressing wires at a tie manufacturing plant.

Gupta, Karan K., Christopher L. Hoffmann, Andrew M. Hamilton, and Frank DeLose. "Fracture Toughness of Pressure Boundary Steels With Higher Yield Strength." In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25214.

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ASME Section III Appendix G provides a fracture mechanics methodology for evaluating the fracture resistance of pressure vessel materials based on comparing the applied stress intensity from service induced loadings on the assumed flaw to a material fracture toughness (KIR) curve. The applicable fracture toughness curve described in Appendix G is defined as a lower bound curve for static, dynamic, and crack arrest fracture toughness tests for a database that includes a number of pressure vessel materials having specified minimum yield strengths of 50 ksi or less. For materials which have specified minimum room temperature yield strength greater than 50.0 ksi but not exceeding 90.0 ksi, the same fracture toughness curve may be used provided fracture mechanics data points are obtained on at least three heats of the material on a sufficient number of specimens to cover the temperature range of interest, including the weld metal and heat affected zone, and provided that the data points are equal to or above that of the fracture toughness curve of Appendix G of the ASME Code (Fig. G-2210-1). At present, the pressure boundary components of steam generators and pressurizers typically use SA-508 Grade 3 Class 2 forgings and SA-533 Type B Class 2 plate material with minimum yield strength of 65 ksi and 70 ksi respectively. The fracture toughness for these materials is not readily available. This technical paper is compilation of fracture toughness of forging and plate material, weld metal, and heat affected zone of such higher strength forgings and plate materials. The paper includes toughness data of weld metal and heat affected zone resulting from high heat input process and includes the toughness test data with long term postweld heat treatment. All dynamic fracture toughness values for the ASME forgings with a minimum yield strength of 65 ksi and plate material with a minimum yield strength of 70 ksi, heat affected zone, and weld metals exceed the ASME specified minimum KIR given in Article G-2000 of the ASME Boiler and Pressure Vessel Code. This data concludes that the ASME specified minimum reference KIR curve can be used conservatively for the forging and plate materials with minimum yield strength of 65 ksi and 70 ksi that are currently specified for construction of steam generators and other Section III, Class 1 components.

Wei, Liwu, Jinhua Shi, and John Buckland. "An Improved Method of Evaluating the Stress Intensity Factor for a Penetrating Circumferential Defect in a Self-Balancing Residual Stress Field in a Weld." In ASME 2016 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/pvp2016-63042.

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It is required to determine the stress intensity factor (SIF) contributed from a through-wall residual stress distribution when assessing the structural integrity of a welded joint containing flaws. By decomposing the through-wall residual stress distribution into a membrane stress component (σm), bending stress component (σb) and self-balancing stress component (σsb), the total SIF from the through-wall residual stress distribution (Ktotal) comprises Km (due to σm), Kb (due to σb) and Ksb (due to σsb). Km and Kb can be relatively easy to determine as there are standard solutions available for common geometries and flaw types. However, it is not straightforward to calculate Ksb owing to the arbitrary distribution of the self-balancing stress component. In particular, no SIF solutions are available for a through-wall penetrating defect in a plate or a cylinder subjected to an arbitrary through-wall self-balancing stress distribution other than for three special distributions (cosine, triangular and square distributions). Neglecting the contribution of σsb to the Ktotal could significantly underestimate the crack driving force, thus leading to a non-conservative assessment of limiting defect size. Therefore, the calculation of Ksb for a though-wall penetrating defect in a plate or a cylinder under an arbitrary stress distribution is of the primary concern in this work. Understandably, finite element analysis (FEA) can be used to calculate the Ksb in these situations, but it is costly to perform such analysis. In this work, a simple method is proposed for estimating Ksb due to the self-balancing component which has a different distribution from the cosine, triangular and square distributions. This method is an extension of the approach adopted by Annex Q, BS 7910:2013 in dealing with the calculations of Ksb resulted from the σsb profiles which are decomposed from the proposed upper bound through-wall welding residual stress profiles. Some typical through-wall welding residual stress distributions are investigated with the proposed method in estimation of the Ksb for a through-wall penetrating defect in a plate or a cylinder. Discussion and highlights are given in the aspects of the effects of welding residual stress profiles on SIFs, the implications for limiting defect sizes, and the likelihood of underestimating the Ksb when using the equation established in R6 Revision 4 with a cosine distribution for any other distributions.

Holste, Joseph R., Robert J. Peterman, Naga Narendra B. Bodapati, B. Terry Beck, and Chih-Hang John Wu. "Transfer Bond Test Used to Predict Transfer Length of Concrete Railroad Ties." In ASME 2013 Rail Transportation Division Fall Technical Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/rtdf2013-4726.

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A study was conducted at Kansas State University to determine the correlation between tensioned-wire pullout tests and the corresponding transfer lengths in prestressed concrete railroad ties. Five different 5.32-mm-diameter pre-stressing wires were selected to be used on this project based on previous testing conducted at Kansas State University (KSU). The wires were tested to simulate the transfer-length bond. The transfer-length bond test involved tensioning each of the wires to 75% of their ultimate capacity, casting concrete around each wire and then de-tensioning the wire when the concrete had reached 4,500 psi. End-slip and force measurements were recorded on both sides of the specimen as the wire was de-tensioned. Transfer bond data was used to investigate the transfer length that each wire type would expect to see in a concrete railroad tie. Prisms with each wire type were cast and the transfer length was measured for each type of wire. Prism measurements were used along with the transfer bond data to correlate a relation between the transfer bond test and the transfer lengths of the prisms.

Carter, Robert H., and David M. Gray. "Gun Liner Emplacement Using Elastomeric Materials." In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25955.

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The development of a process to emplace a refractory metal liner inside a gun tube is described. The process consists of filling the liner with an elastomeric material and then slipping this arrangement into the gun tube whose inner diameter is close to the outer diameter of the liner. The ends of the liner are plugged with plastic disks and pressure is applied to the elastomeric material by a load frame. This pressure can produce a residual internal stress within the steel gun tube that produces a frictional bond between the liner and gun tube. Initial efforts have resulted in bond strengths over 3 ksi (21 MPa). In addition, by tailoring the degree of lubrication between the elastomeric material and the liner, a graded autofrettage can be produced in the steel gun tube.

Li, Xiaoji, Ramgopal Thodla, Fabio Alves, Mario Castro, and Anand Venkatesh. "Hydrogen Embrittlement Evaluation of Different Heats of AISI 8630 Steel in Subsea Applications." In ASME 2020 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/pvp2020-21478.

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Abstract AISI 8630 steel used in subsea applications is subject to hydrogen embrittlement from externally applied cathodic protection. In this work, susceptibility variation on three grades of 8630 steel of different yield strength (YS), 100 ksi, 110 ksi and 120 ksi, were evaluated in terms of fracture toughness. Two different testing methods, slow rising displacement and incremental step loading testing, were used to generate J-R curves and determine the fracture toughness. The tests were performed at 40°F in air and simulated sea water (3.5 wt.% NaCl) with applied CP of −1050 mV SCE. The normalized fracture toughness values are discussed in this work. In all three grades, regardless of the test methods, the environmental toughness under CP conditions were significantly lower than the in-air values indicating that they are susceptible to hydrogen embrittlement. Effect of YS on the hydrogen embrittlement was also observed. The incremental step loading technique showed that Jth and the J-R curve slope decreased as the YS increases. The rising displacement method also clearly showed the lowest toughness and the flattest J-R curve slope in the highest strength grade (120ksi) despite showing similar performance between the 100ksi and 110ksi grades. The true stress-true strain analysis showed different strain hardening behavior among the three grades that may suggest the strain hardening plays a role in influencing the hydrogen embrittlement behavior among the grades. Overall, slight variation could be observed in the results from the two test methods which, however, did not appear to be biased against each other in determining lower bounds of the results.

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Nahmer, Thomas. Die Investition in Fine Wine unter Diversifikations- und Kostengesichtspunkten. Sonderforschungsgruppe Institutionenanalyse, 2018. http://dx.doi.org/10.46850/sofia.9783941627710.

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Dieses Papier untersucht die Sinnhaftigkeit von Fine Wine als Alternatives Investment unter besonderer Berücksichtigung der Kosten eines Fine Wine Investments. Ist Fine Wine zur weiteren Diversifizierung und damit zur Verbesserung des Risikio-Return-Profils von global in Aktien und Anleihen investierenden Portfolios geeignet? Die Analyse erfolgt in einem ersten Schritt auf Indexbasis und in einem zweiten Schritt auf Basis von realen Investitions-möglichkeiten. Die Referenzwährungen sind der US-Dollar und der Euro. Für die Indexbetrachtung werden auf der Aktienseite der MSCI-World-Index und für die Anleihen der JPM-World-Government-Bond-Index verwendet. Bei den Daten für die Investition in Fine Wine liegt der Fokus auf dem Liv-ex-50-Index der im Jahre 1999 gegründeten Londoner Weinbörse Liv-ex. Bei der realen Investition werden für die Datenanalyse bei Aktien und Anleihen Indexfonds verwendet. Da es für die Investition in Fine Wine keinen Indexfonds gibt, wird der Liv-ex-50-Index inklusive aller Kosten einer realen Investition berechnet. Es werden verschiedene Portfoliozusammensetzungen verglichen. Zum einen wird ein Portfolio aus 50% Aktien und 50% Anleihen einem Portfolio aus 45% Aktien, 45% Anleihen und 10% Fine Wine gegenübergestellt. Zum an-deren wird ein Portfolio aus 25% Aktien und 75% Anleihen gegen ein Portfolio aus 20% Aktien, 70% Anleihen und 10% Fine Wine gemessen. Als Vergleichsmaßstab werden die annualisierte Rendite, die Standardabweichung sowie das Sharpe-Ratio der jeweiligen Portfolios berechnet. Die Ergebnisse für die genannten Zeiträume sind ernüchternd. Die Beimischung von Fine Wine führt auf Indexebene lediglich zu einer leichten Verbesserung der annualisierten Rendite aber zu einer markanten Erhöhung des Risi-kos. Bei der Betrachtung der realen Investition kommen die hohen Kosten eines Investments in Fine Wine zum Tragen. Die annualisierte Rendite ist im Vergleich zu den Portfolios ohne Beimischung von Fine Wine niedriger bei gleichzeitig höheren Risikowerten. Lediglich bei der Betrachtung auf Indexbasis in Euro kann bei einem Portfolio eine leichte Verbesserung der Sharpe-Ratio verzeichnet werden. Bei der Betrachtung nach Kosten führt in allen Fällen die Beimischung von Fine Wine zu einer Verschlechterung der Sharpe-Ratios.