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Search Results: 1 - 10 of 1312 matches for " Mirjana Peri? "
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Influence of Conductor Sag on Magnetic Field Distribution in Vicinity of Power Lines
Mirjana Peri,Slavoljub Aleksi?
International Journal of Emerging Sciences , 2011,
Abstract: Determination of the magnetic field distribution in the vicinity of power lines is the subject of many studies during previous years. Some researches show that those fields can have an adverse impact on human health. Magnetic field calculation in vicinity of power line usually assume that its conductors are straight, horizontal wires of infinite length. To introduce a three-dimensional analysis into this calculation, an effect of conductor sag is considered. In this paper the conductor sag is approximated with an approximation of the catenary equation. The Biot-Savart law is applied and expressions for magnetic field components are given. Obtained results will be presented graphically and compared with the exact solution.
Dielectric body with arbitrary shaped and positioned cavity in homogeneous transversal electric field
PeriMirjana T.
Serbian Journal of Electrical Engineering , 2004, DOI: 10.2298/sjee0402175p
Abstract: This paper presents an application of Charge Simulation Method for calculation of the electric field strength and the potential in the arbitrary shaped and positioned cavity of the dielectric body. The dielectric body can also have an arbitrary, but known shape. Several examples of the dielectric body with the cavity are presented. The whole system is in the homogeneous transverse electrical field. The results obtained in this way have been compared to the results obtained by the program’s packages: Bela 1.0 and Quickfield 4.2 (Student’s Edition).
Effects of Two Formulations Based on Bacillus thuringiensis subsp. israelensis on Aedes aegypti Mosquito Larvae under Laboratory Conditions
Milenka Peri,Mirjana Prijovi?,Goran Andri?
Pesticidi i Fitomedicina , 2008,
Abstract: Toxicity and persistence of two formulations based on Bacillus thuringiensis subsp. israelensis applied to Aedes aegypti mosquito larvae were tested under laborabory conditions. The formulations were: a) water dispersible granules (product VectoBac WDG), and b) aqueous suspension (product VectoBac 12AS). The effects of both products on mosquito larvae were tested immediately after their dilution in pure water (zero time) and in 1-, 2-, 8- and 13-day old solutions. The two products were also tested in mixtures of water and clay at a rate of 0.5 g clay/150 ml water immediately after product dilution, and in one-day old solutions containing 0.1 and 0.05 g of clay in the same amount of water. The product VectoBacWDG was persistant and highly effective against Ae. aegypti larvae in pure water after the longest experimental period of 13 days, and significantly more effective than VectoBac 12AS at equal rates of application. The effectiveness of VectoBac 12AS weakened significantly after 8 and 13 days of treatment, compared to the effects at zero time and in 1- and 2-day old solutions. High clay content in water significantly reduced the larvicidal effectivenessof both products, indicating its possible compromising role during product application in practice.
The effects of nitrogen on protein, oil and trypsin inhibitor content of soybean
Peri? Vesna,Srebri? Mirjana,Jankuloski Ljupcho,Jankulovska Mirjana
Genetika , 2009, DOI: 10.2298/gensr0902137p
Abstract: Nitrogen fertilization have influence on protein, oil and trypsin inhibitor content of different soybean genotypes. Seed protein content was increased over control by 60 kg ha-1 nitrogen while trypsin inhibitor was reduced by all treatmens (30, 60,90 N kg ha-1) as compared to controls. Significant genetic variation in TI was found both within the genotype class with the Kunitz inhibitor present as well as within the class lacking this inhibitor. Genotypes containing the Kunitz trypsin inhibitor protein (KTI) exhibit a higher TI than genotypes lacking this protein, however, in both groups of genotypes TI was similary affected by nitrogen application. Oil content was reduced following nitrogen fertilisation.
Choledochoduodenal fistula of ulcer etiology
?olovi? Radoje,Grubor Nikica,Peri?i? Mirjana,Micev Marjan
Srpski Arhiv za Celokupno Lekarstvo , 2010, DOI: 10.2298/sarh1006347c
Abstract: Introduction Choledochoduodenal fistulas are very rare and in most cases are caused by a long-lasting and poorly treated chronic duodenal ulcer. They may be asymptomatic or followed by symptoms of ulcer disease, by attacks of cholangitis or bleeding or vomiting in cases of ductoduodenal stenosis. The diagnosis is simple and safe, however treatment is still controversial. If surgery is the choice of treatment, local findings should be taken into consideration. As a rule, intervention involving closure of fistula is not recommended. Case Outline The authors present a 60-year-old woman with a long history of ulcer disease who developed attacks of cholangitis over the last three years. Ultrasonography and CT showed masive pneumobilia due to a choledochoduodenal fistula. . As there was no duodenal stenosis or bleeding, at operation the common bile duct was transected and end-to-side choledochojejunostomy was performed using a Roux-en Y jejunal limb. From the common bile duct, multiple foreign bodies of herbal origin causing biliary obstruction and cholangitis were removed. After uneventful recovery the patient stayed symptom free for four years now. Conclusion The performed operation was a simple and good surgical solution which resulted in complication-free and rapid recovery with a long-term good outcome. .
Diffusion disorder in liver cirrhosis
?ulafi? ?or?e,Peri?i? Mirjana D.,Rebi? Predrag M.
Srpski Arhiv za Celokupno Lekarstvo , 2002, DOI: 10.2298/sarh0204068c
Abstract: The impairment of diffusion capacity is a very common functional disorder in patients with liver cirrhosis and portal hypertension. Disproportionately higher reduction of the transfer factor compared to restrictive ventilatory disorder, suggests that diffusion disorder is primarily induced by inadequate pulmonary perfusion. The isolated reduction of the transfer factor cannot be only explained in each case by intrapuimonary vascular dilatation.
Syringomyelia in demyelinating disease of the central nervous system: Report of two cases
Savi? Dejan,Vojinovi? Slobodan,Spasi? Mirjana,Peri? Zoran
Srpski Arhiv za Celokupno Lekarstvo , 2011, DOI: 10.2298/sarh1110657s
Abstract: Introduction. Syringomyelia is a cavitary extension inside the spinal cord which can be either symptomatic or congenitally-idiopathic. Syringomyelia during the course of the disease in patients presenting with clinically definite multiple sclerosis was described earlier. Syringomyelia in patients presenting with a clinically isolated syndrome suggestive of multiple sclerosis is unusual. Case Outline. We present two patients presenting with demy-elinating disease of the central nervous system with syringomyelia in the cervical and thoracic spinal cord. We did not find classical clinical signs of syringomyelia in our patients, but we disclosed syringomyelia incidentally during magnetic resonance exploration. Magnetic resonance exploration using the gadolinium contrast revealed the signs of active demyelinating lesions in the spinal cord in one patient but not in the other. Conclusion. Syringomyelia in demyelinating disease of the central nervous system opens the question whether it is a coincidental finding or a part of clinical features of the disease. Differentiation of the significance of syringomyelia finding in these patients plays a role in the choice of treatment concept in such patients.
Efectiveness of Spirodiclofen in the Control of European Red Mite (Panonychus ulmi) on Apple and Pear Psylla (Cacopsylla pyri)
Dejan Mar?i?,Pantelija Peri,Irena Ogurli?,Mirjana Prijovi?
Pesticidi i Fitomedicina , 2007,
Abstract: The effectiveness of spirodiclofen, an acaricide and insecticide with a novel mode of action, in protecting apple from the European red mite (Panonychus ulmi) and pear from pear psylla (Cacopsylla pyri) was tested in field trials in four sites in Serbia in 2004, 2005 and2007. The efficacy of P. ulmi control was investigated at Morovi ( id), where the effects of spirodiclofen were compared with those of fenazaquin, clofentezine, fenpyroximate and bifenthrin. Applied in 2004 at a rate of 0.096 g a.i. L-1 against the overwintering eggs ofP. ulmi, spirodiclofen achieved 86% efficacy, while the efficacies of fenazaquin and clofentezine (25 days after treatment) were 84.4% and 27.8%, respectively. In the same season, spirodiclofen displayed high and prolonged efficacy against a summer population of P. ulmi: the efficacy of this acaricide applied at concentrations of 0.096 and 0.144 g a.i. L-1 was 98% and 96.9%, respectively, while fenpyroximate, clofentezine and bifenthrin achieved 43%, 59.5% and 62% efficacy, respectively (45 days after treatment). This effect of spirodiclofen against the summer population was confirmed in the same site in 2005, when 94.9-95.7% efficacy was achieved (47 days after treatment). The efficacy of spirodiclofen, amitraz and abamectin against eggs and larvae of the first generation of C. pyri was examined at a Bela Crkva site in 2004, and in sites at Mandjelos (Sremska Mitrovica) and Bela Crkva in 2005. Applied at a concentration of 0.144 g a.i. L-1 at the beginning of hatching, spirodiclofen was found to achieve 83.2-95% efficacy, abamectin 93.5-94.9% and amitraz 78.9-95.6% efficacy (14 days after treatment). Applied in a site at Borkovac (Ruma) in 2007 at a rate of 0.096 g a.i.L-1 before hatching of the first generation larvae, spirodiclofen reduced the number of eggs and larvae of C. pyri by 72%, 82% and 89% in evaluations 18, 25 and 38 days after treatment, while abamectin and diflubenzuron achieved reductions of 92%, 95% and 91%, and 78%,71% and 86%, respectively.
Effects of Bioinsecticides in Control of Greenhouse Whitefly (Trialeurodes vaporariorum Westwood) on Tomato
Dejan Mar?i?,Mirjana Prijovi?,Tanja Drobnjakovi?,Pantelija Peri
Pesticidi i Fitomedicina , 2011,
Abstract: The effects of commercial products of entomopathogenic fungus Beauveria bassiana(Naturalis; 0.1%, 0.2% and 0.3%), azadirachtin (NeemAzal T/S; 1% and 2%) and oxymatrin(KingBo; 0.1% and 0.2%) in the control of greenhouse whitefly (Trialeurodes vaporariorumWestwood) on tomato were tested in plastic covered greenhouse. The effects of the bioinsecticides,applied twice at five-day interval, were compared to effects of abamectin (AbastateEW; 0.075%) and thiamethoxam (Actara 25-WG; 0.05%). Tested bioinsecticides reducedthe number of larvae by 82-97% (Naturalis), 90-99% (NeemAzal T/S) and 90-96% (KingBo),with the efficacy of >96% according to Henderson-Tilton, in the assessment 16 days aftertreatment. In the same assessment, achieved percentages in adults reduction and efficacyamounted 24-89% and 67-95% (Naturalis), 85-93% and 93-97% (NeemAzal T/S), 86-96%and 94-98% (KingBo). Percentages of abundance reduction and efficacy after treatment withAbastate EW were 31% and 88% (larvae) and 64% and 84% (adults), while after treatmentwith Actara 25-WG they amounted 96% and 99% (larvae) and 83% and 92% (adults). The resultsobtained show that NeemAzal T/S, Naturalis and KingBo can be an efficient alternativeto current insecticides in control of T. vaporariorum populations.
Determination of heavy metal concentrations in tea samples taken from Belgrade market, Serbia
Peri?-Gruji? Aleksandra A.,Pocajt Viktor V.,Risti? Mirjana ?.
Hemijska Industrija , 2009, DOI: 10.2298/hemind0905433p
Abstract: Tea is one of the world's most popular beverages. Economic and social interest in tea is clear from the fact that about 18-20 billion tea cups are being consumed daily in the world. Consequently, chemical components in tea leaves have received great interest because they are related to health and disease. Various reports have discussed the potential health implications of some chemical factors such as heavy metals in tea, particularly since tea bush is known to accumulate trace metals. Metallic constituents of tea leaves depend on the type of tea and geological origin. In the present study four tea samples (two black and two green) and four herbal tea samples (two Mentha piperita and two Matricaria chammomilla) were collected from the local market in Belgrade, Serbia, in May 2008. The sample preparation has been performed using wet and dry digestion procedures. The metal content (Cu, Zn, Mn, Cd, Ni and Pb) in the digested samples has been analyzed by using flame atomic absorption spectrometry. The comparison of wet and dry digestion has shown significant differences in results, indicating that dry digestion is more appropriate method. The levels of the examined metals obtained by dry digestion in this study compared well with those reported for tea samples from some other parts of the world. Among the investigated metals, the most abundant nutritive metal, Mn, has been the highest with 26.0 to 199.3 mg/kg, while fortunately toxic heavy metal, Cd, has been below the detection limit (0.1 mg/kg). The concentrations of lead and nickel have been in the range 5.1-13.7 and 1.4- -4.4, respectively. The content of lead in two samples (Mentha piperita) has been higher than the maximum permissible concentration of 10 mg/kg specified by the national legislation.
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