RESEARCH STUDIES IN HIGHER EDUCATION: EDUCATING MULTICULTURAL COLLEGE STUDENTS-Ch 7

Book Chapte

Surface coupling effects on the capacitance of thin insulating films

A general form for the surface roughness effects on the capacitance of a capacitor is proposed. We state that a capacitor with two uncoupled rough surfaces could be treated as two capacitors in series which have been divided from the mother capacitor by a slit. This is in contrast to the case where the two rough surfaces are coupled. When the rough surfaces are coupled, the type of coupling decides the modification of the capacitance in comparison to the uncoupled case. It is shown that if the coupling between the two surfaces of the capacitor is positive (negative), the capacitance is less (higher) than the case of two uncoupled rough plates. Also, we state that when the correlation length and the roughness exponent are small, the coupling effect is not negligible

The Effect of Interlanguage and Arabic Verb System on Producing Present Perfect by EFL Learners

The acquisition of foreign language goes through many processes. One of these processes, which attempts to frame the impact of native language on foreign language, is Interlanguage. This study investigated the effect of Interlanguage and Arabic Verb System on producing Present Perfect by EFL learners. The participants of the study were Lebanese University undergraduates who had been studying EFL for 14 years. The erroneous, absence or unconventional USAge of the present perfect motivated the researcher to inspect the reasons behind this production. The instrument of the study is four topics, addressing the present perfect temporal notion,was presented to the learners who chose two of them, and wrote a paragraph on each. The studied samples, which consisted of 100 paragraphs, belonged to 50 participants. Following quantitative and descriptive approach, the samples were collected, corrected, and data were analyzed using tables to demonstrate the percentages of proper USAge of the present perfect and the verb forms that replaced it mistakenly. The results revealed that interlanguage is the reason behind the learnersrsquo wrong production of the present perfect form, as they produced their own systematic linguistic system, which mixed between their native Arabic language verb system and their English tenses in replacing erroneously the present perfect

About A Rare Cause Of Primary Hyperparathyroidism

Introduction: Primary hyperparathyroïdism is observed in 35 to 44 subjects/ 100000 persons. The increased production of parathyroid hormones is secondary to primary glandular modifications consisting mainly in adenomas. The authors report a clear-cell hyperplasia causing primary hyperparathyroidism. Observation: We report the case of a 25-year-old man who was admitted to explore pathologic fractures of the left arm and a malignant hypercalcaemia. Complementary laboratory tests revealed primary hyperparathyroidism. A multiple endocrine neoplasia was excluded by radiologic examinations. Cervical ultra-sound examination revealed 2 parathyroid adenomas and per-operative exploration showed 3 « adenomas ». Microscopic examination of the 4 parathyroid glands specimen concluded to a clear cell hyperplasia. Conclusion: Clear cell hyperplasia is a benign cause of primary hyperparathyroidism. The diagnosis is based upon histologic findings and examination of the 4 glands

Momentum average approximation for models with boson-modulated hopping: Role of closed loops in the dynamical generation of a finite quasiparticle mass

We generalize the momentum average approximation to study the properties of single polarons in models with boson affected hopping, where the fermion-boson scattering depends explicitly on both the fermion's and the boson's momentum. As a specific example, we investigate the Edwards fermion-boson model in both one and two dimensions. In one dimension, this allows us to compare our results with exact diagonalization results, to validate the accuracy of our approximation. The generalization to two-dimensional lattices allows us to calculate the polaron's quasiparticle weight and dispersion throughout the Brillouin zone and to demonstrate the importance of Trugman loops in generating a finite effective mass even when the free fermion has an infinite mass.Comment: 15 pages, 14 figure

Pistachio (Pistacia vera) by-products as ruminant feed: a review on production, management and utilization in arid and semi-arid areas in the Middle East

This review presents recent knowledge of the inclusion of pistachio by-products in diets of ruminants. Pistachio harvesting and processing result in considerable amounts of by-products which include hulls (the outer cover of fruit), woody shells (mesocarp), blank fruits, clusters (sometimes referred as twigs) and leaves. The by-products can be preserved by natural drying or ensilaging. This review evaluates pistachio by-products in terms of chemical composition, nutritive value and their effects on ruminant performance and product quality. Their nutritive value is affected by factors which include type of by-product, pistachio variety, harvesting time and preservation method. Pistachio by-products can use as a source of protein and energy in ruminant feeding to support maintenance and production of meat, milk, wood and hair. Their replacement value in diets of growing, fattening and lactating ruminants ranges between 21-35%.The replacement values of silage from pistachio by-products ranges between 15-24%. However, the presence of high levels of copper and phenolic compounds in pistachio by-products may restrict their inclusion in high proportions into ruminant diets. There is need for more research on the inactivation of phenolic compounds in pistachio by-products so that they can be fed to ruminants in larger proportions. Further studies are needed to evaluate the effects of pistachio by-products on production and reproduction performance of ruminants as well as product quality. The presence of pesticides, fungicides and phenolic compounds in pistachio by-products necessitate identifying the effect of long term feeding on livestock health

Histological evaluation of pulp response to Pulpine NE versus Biodentine as direct pulp capping materials in a dog model

Objective: The material used for pulp capping has a significant impact on the outcome of vital pulp therapy. This study compared the pulp tissue response to Pulpine NE versus Biodentine as direct pulp capping materials in a dog model. Methods: Twenty-four teeth in two mongrel dogs (1-2-year-old) were used. In each dog (n=12 teeth), the dental pulps were exposed in 8 teeth (2 experimental groups, 4 teeth each) and left unexposed in 4 teeth (control group, n=4 teeth). A class V cavity was performed on the buccal surface of the selected teeth in the experimental groups. The exposed pulps were capped either with Pulpine-NE (group I) or Biodentine (group II). Then, the cavities were restored with Riva resin modified glass ionomer filling material. One dog was euthanized at 14 days after pulp capping and the second dog was euthanized after 45 days. Histological analysis of the continuity of dentin bridge, tissue disorganization and inflammatory reaction were statistically analyzed. Results: The results revealed that Biodentine exhibited statistically significant higher dentin bridge formation than Pulpine NE after 14 and 45 days (PConclusion: Pulpine NE was capable of inducing reparative dentin when used as a direct pulp capping material. Nevertheless, Biodentine showed more efficient dentin bridge formation, tissue organization and anti-inflammatory potential than Pulpine NE