the aim of this study was to evaluate the effect of chlorhexidine (chx) application on immediate and two-month bond strength of a filled adhesive system. methods: forty eight non-carious human third molars without enamel of occlusal surface were randomly divided into two main groups according to chx application: control and chx. each main group was further subdivided into 2 subgroups depending ...

Software is neither material nor immaterial but durable, entrenched and scaffolded. In this article we suggest that services and software should be understood through the diverse forms of durability and temporality they take. We borrow concepts from evolution and development, but with a critical eye towards the diagnosis of value(s) and the need for constant maintenance. We look at examples fro...

This chapter examines how product price, product complexity and product durability influence consumers’ comparison.shopping.process...Frequently.comparison.shopping.is.equated.only.to.price.comparisons.. However, comparison shopping is becoming far broader than finding the cheapest price over the Internet. Nowadays.a.vast.variety.of.products.are.sold.over.the.Internet...Some.are.relatively.simp...

We develop a model to show that cartels that produce goods with lower durability are easier to sustain implicitly. This observation generates the following results: 1) implicit cartels have an incentive to produce goods with an inefficiently low level of durability; 2) a monopoly or explicit cartel is welfare superior to an implicit cartel; 3) welfare is non–monotonic in the number of firms; 4)...

this paper aims at investigating the influence of partial replacement of portland cement with ultrafine fillers compared to limestone powder on the durability and mechanical characteristics of concrete. for this purpose, ultrafine calcium carbonate materials with different specific surface areas of 9.7 and 15.1 m2/g and limestone powder (0.72 m2/g) were used. the results indicate that the ultra...

To clarify the friction durability, both during and after the high-temperature heating of nanometer-thick diamond-like carbon (DLC) films, deposited using filtered cathodic vacuum arc (FCVA) and plasma chemical vapor deposition (P-CVD) methods, the dependence of the friction coefficient on the load and sliding cycles of the DLC films, were evaluated. Cluster-I consisted of a low friction area i...

Transcatheter aortic valve (TAV) intervention is now the standard-of-care treatment for inoperable patients and a viable alternative treatment option for high-risk patients with symptomatic aortic stenosis. While the procedure is associated with lower operative risk and shorter recovery times than traditional surgical aortic valve (SAV) replacement, TAV intervention is still not considered for ...

A research program was conducted on different clay-bearing rocks selected from the Ilam, Sarpol-e Zahab and Tajarak regions (Iran) to predict their slaking characteristics. The new durability apparatus (nested mesh drums) separates disintegrated particles varying from > 25.4 to < 2 mm as the drums were rotated. On the basis of the particle size distribution, the disintegration ratio (DR) was us...

Surface finishes are used to preserve and promote solderability of exposed copper metallization on printed wiring boards. While in the best of worlds, the solder used in assembly should dictate the solder interconnect reliability, surface finishes are known to have an effect. The effect of surface finishes on solder interconnect reliability can be particularly strong under high strain rate load...

Title of Document: MODELING RATE DEPENDENT DURABILITY OF LOW-AG SAC INTERCONNECTS FOR AREA ARRAY PACKAGES UNDER TORSION LOADS Vikram Srinivas, Master of Science, 2010 Directed By: Chair Professor, Michael G. Pecht, Department of Mechanical Engineering The thesis discusses modeling rate-dependent durability of solder interconnects under mechanical torsion loading for surface mount area array com...