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Purpose The purpose of this paper is to provide a framework for guiding social innovation in service (SIS), defined as the creation of novel, scalable and sustainable market based service offerings that solve systemic societal problems. Design/methodology/approach This research provides a review and synthesis of transdisciplinary literatures to establish a basis for the conceptual framework proposed for SIS. Findings It is argued that the primary unit of an SIS is the service firm and that there are micro-, meso-, and macro-level actors and enablers in the ecosystem that can help bring about SIS. Examples from the hospitality and tourism industry are used to demonstrate key points. Practical implications Benefits of an SIS to companies include growth through new markets and innovative value offerings, sustainable supply chains in production, building consumer value and trust in the company/brand, attracting and retaining talent and being proactive in including social and environmental measures of success in customer metrics and company financial reporting. Originality/value This paper contributes to the social innovation and service literature by: offering a new, scientifically supported view of an SIS; providing managers with a framework to guide social innovation within their service firm and for the benefit of their company and its stakeholders; and directing service scholars to research issues necessary to advance SIS.

The critical behavior and phase transition in the 2+1 dimensional Bañados, Teitelboim, and Zanelli (BTZ) black holes are discussed. By calculating the equilibrium thermodynamic fluctuations in the microcanonical ensemble, canonical ensemble, and grand canonical ensemble, respectively, we find that the extremal spinning BTZ black hole is a critical point, some critical exponents satisfy the scaling laws of the "first kind", and the scaling laws related to the correlation length suggest that the effective spatial dimension of extremal black holes is one, which is in agreement with the argument that the extremal black holes are the Bogomol'nyi saturated string states. In addition, we find that the massless BTZ black hole is a critical point of spinless BTZ black holes. PACS numbers: 04.70.Dy, 04.60.KzAccording to the definition of Kaburaki [17], some critical exponents can be given as

In a hip simulator wear test using bovine serum as a lubricant, the heat generated by ball-cup friction may cause precipitation of the proteins from the lubricant. The resultant accumulation of a solid layer of precipitated protein between the ball and cup could artificially protect the bearing surfaces from wear, in a manner that does not occur in vivo. Alternatively, the gradual depletion of the soluble proteins could interfere with their ability to act as boundary lubricants on the bearing surfaces, thereby artificially increasing the wear rate. Because the rate of protein precipitation may depend on the maximum temperature at the bearing surfaces during sliding, rather than the mean temperature of the bulk lubricant, this study determined the transient surface temperatures using an array of thermocouples embedded in acetabular cups of GUR 415 ultra-high molecular weight polyethylene (UHMWPE) and femoral balls of metal or ceramic, in conjunction with a finite element model of the temperature distribution. The prostheses were tested at one cycle/s under a Paul-type, physiological load profile with 2030 N maximum force, with the load cycle synchronized to the motion cycle. The steady state temperatures of the bulk lubricant were 38 degrees C for the zirconia balls, 36 degrees C for the cobalt-chromium and 33 degrees C for the alumina. However, the corresponding surface temperatures of the polyethylene, calculated with the finite element model, were 99 degrees C with zirconia ceramic, 60 degrees C with cobalt-chromium alloy, and 45 degrees C with alumina ceramic. The rank order of the surface temperatures corresponded to the relative amounts of protein that were precipitated in the test chambers during wear tests with these materials.

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Multimillion-to-billion-atom molecular dynamics simulations are performed to investigate the interaction of voids in silica glass under hydrostatic tension. Nanometer size cavities nucleate in intervoid ligaments as a result of the expansion of Si-O rings due to a bond-switching mechanism, which involves bond breaking between Si-O and bond formation between that Si and a nonbridging O. With further increase in strain, nanocracks form on void surfaces and ligaments fracture through the growth and coalescence of ligament nanocavities in a manner similar to that observed in ductile metallic alloys.

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