This paper presents a scheduling problem with unrelated parallel machines and sequencedependent setup times that minimizes the total weighted tardiness. A new branch-and-bound (B and B) algorithm is designed incorporating the lower and upper bounding schemes and several dominance properties. The lower and upper bounds are derived through an assignment problem and the composite dispatching rule ...

copper matrix composite reinforced by 1wt.% tib2 particles was prepared using in situ reaction of cu-1.4wt.% ti and cu-0.7wt.% b by rapid solidification and subsequent heat treatment for 1-20 hrs at 900ºc. high-resolution transmission electron microscopy (hrtem) characterization showed that primary tib2 particles were formed in liquid copper. heat treatment of as-solidified samples led to the f...

OBJECTIVE Classical Hodgkin lymphoma shows a peak incidence at 15-35 years, and a second peak in elderly patients; however, pathological characteristics of elderly patients with classical Hodgkin lymphoma have not been analyzed enough. METHODS In a total of 154 patients with classical Hodgkin lymphoma, we analyzed the clinicopathological characteristics of classical Hodgkin lymphoma patients ...

The aim of this in vitro study was to evaluate and compare the color stability of different esthetic restorative materials (one microfilled composite, one nanofilled composite, one nanoceramic composite, one microfilled hybrid composite, one microfilled hybrid composite, one nanohybrid Ormocer based composite and one supra-nano spherical hybrid composite) after exposure to different staining so...

PURPOSE The objective of this in-vitro study was to measure and compare microleakage around preventive resin restorations prepared conventionally or with air abrasion, in the presence or absence of acid etching. METHODS One hundred extracted human non carious molars were assigned to each of four groups. Group A: fissures opened with a high speed handpiece, etched, and restored with composite ...

Rheumatoid arthritis (RA) is related to alterations in different inflammatory and connective tissue biomarkers. The diagnostic values the factors affecting these biomarkers are conflicting. In present study, a bone-related composite (B-composite), made from z-score of stromelysin-1 (MMP3), colony-stimulating factor 2 (CSF2), osteopontin (OPN), I-composite, reflecting immune activation, tumor ne...

OBJECTIVE The objective of this study was to investigate, by simulation, the effect of conventional composite resin insertion techniques on cuspal deflection using bonded typodont artificial teeth. The deflection produced by a new low-shrinkage composite was also determined. MATERIALS AND METHODS Sixty standardized MOD preparations on ivorine maxillary premolars were prepared: group A at 4 mm...