The electronic structures of charged point defects influence electrical and optical properties semiconductors. Understanding the orbital interactions responsible for therefore promotes a chemical intuition defect-driven mechanisms in In this tutorial, we discuss molecular theory-based framework understanding defect-induced states based on local between defect atoms surrounding site. By using Mg...

Using an ab initio molecular-dynamics scheme ~the ‘‘fireball’’ scheme!, we determined the equilibrium structure of intermediate-size SinGem (n1m571) nanoclusters with and without hydrogen passivation on the surface. Due to the strong surface distortion, defect states are found to permeate the energy gap of SinGem clusters. However, the defect states are removed by adding H atoms on the surface ...

OBJECTIVES This study presents the role of the temporalis muscle flap in primary reconstruction after orbital exenteration. METHODS A retrospective nonrandomized study of orbital exenterations performed between 1990 and 2010 for malignant tumors of the skin, paranasal sinus, and nasal cavity is presented. RESULTS The study included 13 patients (nine men, four women; age range, 30-82 years) ...

Within the wide range of severity of orbital fractures, the small group of complex fractures causes most of the sequelae. Therefore identification of severe injuries and adequate treatment is of major importance. The introduction of craniofacial techniques made possible a wide exposure of even large orbital wall defects and their reconstruction by grafts. In spite of significant progresses, rep...

Maxillary sinus mucocele can occur due to many medical factors such as chronic infection, allergic sinonasal disease, trauma, and previous surgery. However, it occurs mainly after Caldwell-Luc operation, usually more than 10 years after surgery. There are a few cases of maxillary sinus mucocele with ocular symptoms. Also, a case causing ocular symptoms because of invasion to the orbital floor i...

We propose a local real-space formulation for orbital-free DFT with density dependent kinetic energy functionals and a unified variational framework for computing the configurational forces associated with geometry optimization of both internal atomic positions as well as the cell geometry. The proposed real-space formulation, which involves a reformulation of the extended interactions in elect...

BACKGROUND The objective of this article is to evaluate clinical outcomes of combined orbital floor and medial wall fracture repair using a three-dimensional pre-bent titanium implant in an East Asian population. METHODS Clinical and radiologic data were analyzed for 11 patients with concomitant orbital floor and medial wall fractures. A combined transcaruncular and inferior fornix approach w...

Forty-nine cases of orbital cellulitis were reviewed. The average age of patients at presentation was 31 years. The onset of symptoms varied from seven days or less in 28 patients, one to four weeks in 17 patients, and more than four weeks in four patients. The leucocyte count, available in 33 patients, was greater than 10 X 10(9)/l in only nine. Abnormal sinuses were noted radiographically in ...

Objective: To describe a detailed presentation and the utility of ocular imaging, both ultrasound orbital computed tomography (CT), to confirm diagnosis traumatic ONA in which megadose steroid would give no advantage. Case Presentation: A five-year-old boy came with unilateral sudden visual loss after incidentally falling his left eye struck handlebar parked bicycle. His had light perception, o...

Porous polyethylene is a widely used implants in orbital reconstruction, on which comprehensive clinical analysis, various treatments, and different prognosis according to specific classification principles on long-term complications have not been reported.To investigate the new clinical symptoms, intraoperative findings, treatments, and outcomes of complications long period after previous surg...