On a SHOCKLEY-READ-HALL model for semiconductors

The Shockley-Read-Hall model was introduced in 1952 to describe the statistics of recombination of holes and electrons in semiconductors occurring through the mechanism of trapping and we consider initial-boundary value problems with initial conditions

Holocord low grade astrocytoma – Role of radical irradiation and chemotherapy

AbstractSpinal intradural tumors, especially those extending along the entire length of the spinal cord, termed as ‘holocord’ tumors are uncommon. Most of these are gliomas, with astrocytomas (low grade) predominating in children and ependymomas in adults. Other histologies, though reported, are even rarer. Management is debatable, with both surgery and radiotherapy of such extensive tumors posing challenges. We describe a case of a 14-year-old girl with holocord astrocytoma extending from cervicomedullary junction till lumbar spine, who recovered full neurological function following radical irradiation of entire spine followed by temozolomide-based chemotherapy. No grade 3/4 bone marrow morbidity was seen. Five years following treatment, she maintained normal neurological function and apparently normal pubertal and skeletal growth despite residual disease visible on imaging. Literature review of existing reports of holocord astrocytomas highlighting management and outcome is presented

INSIGHT INTO ANTIMICROBIC EVALUATION TECHNIQUES AND THEIR ROLE IN BETTER ASSESSMENT OF ANTIMICROBIC AGENTS: A REVIEW

At present, researchers have a keen interest in creating advanced antimicrobic agents to overcome microbial resistance from various new sources either from plants or microbes. For this, robust attention has been given to the advancement in the rapid antimicrobic assessment strategies and methods to develop antimicrobic agents. Some of the antimicrobic techniques such as well diffusion using broth and agar and disc diffusion are more prominent in assaying antimicrobial testing while techniques such as bioluminescence, flow cytofluorometry methods are less used due to specific equipment’s, high calibration and evaluation processes. Thus, the information of precise antimicrobial techniques is must to the new researchers for antimicrobic testing. In this review article, various antimicrobic techniques with their advantages and limitations are being reported which are currently being carried out for antimicrobial testing

Environnemental aspects of thermal power plants utilization in Novi Sad - air pollution

Problem aerozagađenja usled rada termoenergetskih postrojenja (toplana) jedan je od glavnih ekoloških problema velikih gradova, pa i drugog grada po veličini u Republici Srbiji – Novog Sada. Javno komunalno preduzeće „Novosadska toplana“ sa svoja četiri velika objekta snage preko 50MW i velikim brojem emitera toplana smeštenih u zonama stanovanja ima značajan uticaj na kvalitet vazduha u gradu. Osnovni cilj rada je ispitivanje ekoloških aspekata rada termoenergetskih postrojenja u Novom Sadu sa posebnim akcentom na aerozagađenje. Istraživanjem je obuhvaćeno četiri najveća postrojenja JКP „Novosadska toplana“ i monitoring CO, NOX, SO2 i praškastih materija za period od 2011-2015.godine. Rezultati istraživanja imaju za cilj da pokažu da li je nivo aerozagađenja nastao kao posledica rada termoenergetskih postrojenja koja koriste prirodni gas kao osnovni energent u okviru zakonske regulative, odnosno ne prelaze vrednosti ( graničnih vrednosti emisije GVE) i ne utiču bitno na kvalitet vazduha grada Novog Sada. Takođe je vršeno istraživanje uticaja meteoroloških parametara na nivo aerozagađenja kao i uticaj aerozagađenja na pojavu hroničnih respiratornih bolesti. Na osnovu dobijenih rezultata dat je predlog mera za unapređenje ekoloških performansi termoenergetskih postrojenja.Ono što se najviše nameće kao potreba jeste smanjenje emisije štetnih supstanci u životnu sredinu, gledano sa aspekta termoenergetskih postrojenja to se najviše odnosi na smanjenje emisije NOx, CO, kao i praškastih materija

IMMOBILIZATION OF AMYLASE PRODUCING BACTERIA (BACILLUS SUBTILIS) FROM SOIL OF WESTERN HIMALAYAN REGION SOLAN, HIMACHAL PRADESH, INDIA

Objective: The paper aimed to immobilize amylase producing bacterial strain on a suitable matrix and characterization of its physicochemical properties so that much amount of amylase could be produced to be applied in different industries. Methods: Bacterial colonies were sub-cultured from samples collected from soil in freshly prepared dishes containing starch agar by dot method using sterile inoculating needles from which five different bacteria belonged to genus Bacillus were isolated and assigned as A1, A2, A3, A4, and A5. Results: It was found that A1 displayed the highest enzyme activity of 17.89 IU/ml with enzyme assay of 0.83 mg/ml and the bacterium was identified to be Bacillus subtilis. A5 displayed 10.13 IU/ml with protein contents of 0.11 mg/ml indicated that A1 possess the highest enzyme activities which were categorized under Bacillus and protein contents and A5 showed less amount of enzyme activities and protein contents as compared to other. Conclusion: The bacteria which were produced much amount of enzyme activities identified as Bacillus subtilis and recommended and have been recommended to be cultured for the production of amylase enzyme

Über die Größe der Einzugsbereichedes Newtonverfahrens transzendenter ganzer Funktionen

Eines der bekanntesten numerischen Verfahren zur Approximation von Nullstellen differenzierbarer Funktionen ist das Newtonverfahren. In dieser Arbeit schätzen wir die Größe der Einzugsbereiche der Nullstellen gewisser Funktionen unter dem Newtonverfahren ab. Dabei bezeichnen wir die Menge aller Punkte, die unter Iteration des Newtonverfahrens gegen eine Nullstelle der betrachteten Funktion konvergieren, als Einzugsbereich. Für geeignet normierte Polynome gab Kriete eine Abschätzung der Größe der Einzugsbereiche. Er bewies insbesondere, dass für solche Polynome der Flächeninhalt der Einzugsbereiche unendlich ist. In dieser Arbeit zeigen wir ähnliche Ergebnisse für reelle transzendente ganze Funktionen, deren Ordnung durch zwei beschränkt ist. Dass man für Funktionen höherer Ordnung derartige Ergebnisse nicht erwarten kann, erhält man aufgrund eines Ergebnisses von Haruta. Sie bewies, dass schon für Funktionen, die die Gestalt f(z) = P(z) · exp(Q(z)) haben, wobei P ein Polynom vom Grad größer als zwei und Q ein beliebiges Polynom ist, die Größe der Einzugsbereiche endlich sind. Wir werden beweisen, dass für Funktionen aus der Laguerre-Pólya-Klasse (LP) die Einzugsbereiche der Fixpunkte des Newtonverfahrens unendlichen Flächeninhalt besitzen. Dabei besteht die Laguerre-Pólya-Klasse aus den Funktionen, die sich lokal gleichmäßig durch reelle Polynome mit ausschließlich reellen Nullstellen approximieren lassen. Es gilt der folgende Satz. Satz 1 Es sei f ∈ LP oder allgemeiner f von der Gestalt f = g · P, wobei g ∈ LP und P ein reelles Polynom ist. Ferner sei z_0 ∈ C eine Nullstelle von f und U der unmittelbare Einzugsbereich von z_0 bezüglich des Newtonverfahrens. Dann gilt area(U) = ∞. Mit Hilfe des Ergebnisses über LP-Funktionen beweisen wir, dass für Flächeninhalte reeller transzendenter ganzer Funktionen der Ordnung kleiner als zwei eine quantitative Abschätzung nach unten möglich ist. Es gilt folgender Satz. Satz 2 Es sei f : C → C eine transzendente ganze Funktion endlicher Ordnung ρ≥0 mit f(R) ⊂ R, welche nur endlich viele nicht reelle Nullstellen habe. Weiter sei z_0 ∈ C eine Nullstelle von f und U der unmittelbare Einzugsbereich von z_0 bezüglich des Newtonverfahrens. Ferner sei ε ∈ R>0. Dann existiert eine Konstante R_0>0 derart, dass area (U ∩ A(0, R_0, R)) ≥ R^{2−ρ−ε} für alle R >2_R0. Insbesondere gilt area(U) = ∞, falls ρ < 2 ist

Accelerometer-Measured Versus Self-reported Physical Activity in College Students: Implications for Research and Practice

Objective: To determine the level of moderate-vigorous physical activity (MVPA) assessed via self-report and accelerometer in the college population, and to examine intrapersonal and contextual variables associated with PA. Participants: Participants were 77 college students at a university in the northwest sampled between January 2011 and December 2011. Methods: Participants completed a validated self-report measure of PA and measures of athletic identity and benefits and barriers to exercise. Participants’ PA levels were assessed for two weeks via accelerometry. Results: Participants’ estimations of their time spent engaged in MVPA was significantly higher when measured via self-report vs. accelerometry. Stronger athletic identity, perceived social benefits and barriers, and time-effort barriers were related to PA levels. Conclusions: Estimation of college level PA may require interpretation of data from different measurement methods, as self-report and accelerometry generate different estimations of PA in college students who may be even less active than previously believed