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Electronic properties of (Zn,Co)O systems probed by scanning tunnelling spectroscopy
L. Moldovan
Journal of Electrical and Electronics Engineering , 2008,
Abstract: The aim of this paper is to gain insight into theelectronic properties of (Zn,Co)O system - a widebandgap Diluted Magnetic Semiconductors (DMS)showing room temperature (RT) ferromagnetism undern-type doping conditions. On the experimental side, ultrahigh-vacuum scanning tunnelling microscopy andspectroscopy (STM and STS) at variable temperature (T)are used to probe the local electronic structure of thesystem. It is presented the map of the local density ofstates (LDOS) of polar ZnO surfaces. Then, it is possibleto decorate (incorporate) Co atoms onto (into) thesemiconductor.
2D Hole System Characterization by T/TF Dependence of Electrical Resistivity
L. Moldovan
Journal of Electrical and Electronics Engineering , 2009,
Abstract: The paper presents an experimental setup design for two-dimensional (2D) systems characterization at ultra low-temperature. The electrical resistivity can be measured for variable density of carriers. The resistivity measurements were done for different densities and shows the influence of finite-temperature over the behavior for an 2DHS confined in GaAs.
List of rare, endemic and threatened plants in Romania (II)
I. MOLDOVAN,Denes PAZMANY,L. DRAGOS
Notulae Botanicae Horti Agrobotanici Cluj-Napoca , 1989,
Abstract: This note presents another 35 endemic species accepted by the Romanian specialists (8) consecutive to the IUCN list published earlier (13) as well as 137 rare species, the majority of them threatened. The ecologic, sozologic and phytocenotic indices are presented by IUCN Red Data Book Categories.
Entomofauna of the Linaria vulgaris Mill.
Teodosie PERJU,I. MOLDOVAN,L. TEODOR
Notulae Botanicae Horti Agrobotanici Cluj-Napoca , 1993,
Abstract: From the plants were collected a lot of insects: Chrysopa carnea (Neuroptera), Exolygus rugulipennis, Holcosthetus vernalis (Heteroptera), Cymnetron antirrhini, G. tetrum, Pseudathous rufipes, Vadonia livida (Coleoptera). From flowers were collected the following species: Taenyothrips linariae (Thysanoptera) and Meligethes aeneus (Coleoptera). From capsels were reared the species: Cymnetron antirrhini, G. tetrum (Coleoptera), Cochylis posterana, C. hybridella, Eupoecilia angustana, Balseuncaria ciliella and Eupithecia linariata (Lepidoptera). From galv, developed on the roots of the plant, was reared the wecvil Cymnetron collinum (Coleoptera). There was made also some biological and ecological considerations about the Cymnetron species, heese being more important factors to reduce the multiplication capacity of Linaria spp.
Invertebrate fossils from cave sediments: a new proxy for pre-Quaternary paleoenvironments
O. T. Moldovan,A. Mihevc,L. Mikó,S. Constantin
Biogeosciences Discussions , 2011, DOI: 10.5194/bgd-8-3403-2011
Abstract: Five samples of clastic sediments from interior cave facies taken in three Slovenian relic caves (Trhlovca, Ra i ka pe ina, and a cave in rnoti e Quarry, Classical Karst, SW Slovenia) provided invertebrate fossil remains. Most of them belong to Oribatida but sparse individuals of Cladocera and insects were also identified. They represent the first pre-Quaternary invertebrate fossils found in sediments of continental temperate climate. The Pliocene/Pleistocene age of the sediments was determined by paleomagnetic dating chronologically calibrated by micromammal biostratigraphy. Invertebrate fossils could be validated as new proxy for the study of cave sediments due to their suitability for ecological and paleogeographic correlations in caves and outside the caves. They also bring additional information about cave formation and karst hydraulic regime in the area. Even if the number of remains was very low, it represents evidence that climatic conditions in caves allow a better preservation of fossil remains of some groups as compared to most of the surface habitats. This may open a new direction in the study of cave sediments.
Assessment of the Efficacy of Cardio-Metabolic Pathology Treatment and of the Medical Recommendations Adherence in a Military Population
L?cr?mioara Ana MOLDOVAN,Nicolae H?NCU
Applied Medical Informatics , 2008,
Abstract: Aim: To assess the efficacy of cardio-metabolic diseases treatment, the compliance to treatment, and to evaluate the obtained results compared to the previous published ones.Methods: A screening was conducted in the military population, including male and female with age at least 20 years, with of without: diabetes, impaired fasting glucose, obesity, hypertension, dyslipidemia. The anthropometrics parameters, body fat percent, and blood pressure were evaluated. The following data were collected: glycemia, lipid profile, renal and hepatic function, level of physical activity, smoking status, personal associated diseases. The compliance to treatment was noted in percentages declared by patient in a survey. The IRIS 2 score of insulin resistance and cardiovascular risk using EURO’98 charts, Framingham Score and SCORE system were calculated. The metabolic syndrome diagnosis was performed using the International Diabetes Federation 2005 criteria. Results: 338 persons were investigated; the majority were males, 192 with normal glycemia. The objectives of the treatment were reached in < 50% cases for each pathological aspect. A negative correlation was found between anthropometric parameters and the compliance to diet and physical exercise, and positive correlation between bodyweight, high cardiovascular risk and medication. The study showed the same pattern of the treatment as in other studies, with a low compliance to medical nutrition therapy and with low percentage in witch the objective for cardio-metabolic pathology are reached. Conclusions: An active and sustained attitude is necessary to promote a healthy lifestyle in the respect of improvement of treatment and prevention of metabolic and cardiovascular morbidity and mortality.
Swimming Efficiency of Bacterium Escherichia Coli
Suddhashil Chattopadhyay,Radu Moldovan,Chuck Yeung,X. L. Wu
Physics , 2005, DOI: 10.1073/pnas.0602043103
Abstract: We use in vivo measurements of swimming bacteria in an optical trap to determine fundamental properties of bacterial propulsion. In particular, we determine the propulsion matrix, which relates the angular velocity of the flagellum to the torques and forces propelling the bacterium. From the propulsion matrix dynamical properties such as forces, torques, swimming speed and power can be obtained from measurements of the angular velocity of the motor. We find significant heterogeneities among different individuals even though all bacteria started from a single colony. The propulsive efficiency, defined as the ratio of the propulsive power output to the rotary power input provided by the motors, is found to be 0.2%.
Resonant valley filtering of massive Dirac electrons
D. Moldovan,M. Ramezani Masir,L. Covaci,F. M. Peeters
Physics , 2013, DOI: 10.1103/PhysRevB.86.115431
Abstract: Electrons in graphene, in addition to their spin, have two pseudospin degrees of freedom: sublattice and valley pseudospin. Valleytronics uses the valley degree of freedom as a carrier of information similar to the way spintronics uses electron spin. We show how a double barrier structure consisting of electric and vector potentials can be used to filter massive Dirac electrons based on their valley index. We study the resonant transmission through a finite number of barriers and we obtain the energy spectrum of a superlattice consisting of electric and vector potentials. When a mass term is included the energy bands and energy gaps at the K and K' points are different and they can be tuned by changing the potential.
The epidermal study of sweet chestnut-tree Leaf (Castanea sativa Mill.)
I. MOLDOVAN,Aurelia MOLDOVAN
Notulae Botanicae Horti Agrobotanici Cluj-Napoca , 1992,
Abstract: This paper is part of a broader study on the ontogenetic evolution of C. sativa. On detached epidermis, obtained by different methods, the following structural aspects have been studied: the shape and size of the cells of each sample and their number on surface unity, the type of stomata, the size of stomata, the number of stomata on surface unity and the stomatic index. At the same time remarks have been made concerning the protecting and secretive hairs of each sample.
Spectrophotometric determination of nitrite by its catalytic effect on the oxidation of congo red with bromate
Zenovia Moldovan
Bulletin of the Chemical Society of Ethiopia , 2012,
Abstract: A novel simple, sensitive and rapid kinetic-spectrophotometric method for the determination of trace amounts of nitrite is proposed. The method is based on its catalytic effect on the oxidation of congo red (CR) by potassium bromate in acidic solution. The oxidation reaction is monitored spectrophotometrically by measuring the decrease in the absorbance of CR at a suitable λmax= 570 nm for the first 10–40 s from the start of the reaction. Under the optimum experimental conditions (sulfuric acid, 0.3 M; CR, 0.75x10-4 M; potassium bromate, 5x10-4 M and 25 oC), nitrite can be determined in the range of 0.015–0.75 μg mL 1 with the detection limit of 0.006 μg mL 1. The relative standard deviation of five replicate determination of 0.25 μg mL 1 nitrite was 2.5%. The proposed method was applied satisfactorily to the determination of nitrite in spiked drinking water samples. KEY WORDS: Nitrite, Catalytic effect, Congo red, Spectrophotometry, Drinking water Bull. Chem. Soc. Ethiop. 2012, 26(2), 159-169. DOI: http://dx.doi.org/10.4314/bcse.v26i2.1
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