NUMERICAL CALCULATION OF SHIELDING EFFECTIVENESS OF ENCLOSURE WITH APERTURES BASED ON EM FIELD COUPLING WITH WIRE STRUCTURES

In this paper a shielding effectiveness of protective metal enclosure with apertures and receiving antenna placed inside is numerically considered. The purpose of antenna, here considered as a dipole, is to detect the electromagnetic (EM) field level within the enclosure and to transfer this information via a coaxial cable to network analyzer. This follows the experimental procedure used to measure the shielding effectiveness of enclosure. Numerical model, based on the Transmission-Line Matrix (TLM) method and enhanced with so-called wire node, is used to simulate this experimental setup in order to investigate how much the antenna/cable presence underestimates the level of shielding effectiveness due to their two-way coupling with EM field inside enclosure. The numerical model is first verified with experimental results available in literature and then used to estimate the influence of radius and length of dipole-receiving antenna and the impact of cable presence on the distribution of EM field inside the enclosure and resonant frequencies shift

Uticaj dužine rezidbe na masu grozda stonih sorti vinove loze

Each grapevine variety has specific pruning requirements to ensure optimal grape yield and quality. The main objective of this paper is to examine the impact of pruning severity on cluster size in table grapevine varieties under conditions of the Kozara wine-growing region. The research was conducted on the grapevine varieties ’Lasta’, ’Karmen’, ’Palatine’, ’Esther’,’Muscat Saint Vallier’ and ’Chasselas rose’. Cluster position on the fruiting shoot developing from both the spur and the cane,cluster weight and number of clusters per node were analyzed. Moving node position away from the base of the fruiting shoot results in reduced cluster size in ’Lasta’, ’Karmen’, ’Palatine’, ’Esther’ and ’Chasselas rose’, and in increased cluster weight in ’Muscat Saint Vallier’. A significant correlation was observed betweencluster weightandcluster position onthe fruiting shootin ’Lasta’, ’MuscatSaintVallier’and ’Palatine’.Svaka sorta vinove loze zahteva određen način rezidbe kako bi se dobio odgovarajući prinos i kvalitet grožđa. Osnovni cilj rada predstavlja ispitivanje uticaja dužine rezidbe na veličinu grozda stonih sorti vinove loze u uslovima Kozaračkog vinogorja. Istraživanje je obavljeno na sortama Lasta, Karmen, Palatina, Esther, Muscat St. Vallier i Chaselas rose. Kod ispitivanih sorti analizirana je pozicija pojave grozda na rodnim lastarima kondira i luka, njihova masa i učestalost pojave grozda na nodusima. Udaljavanjem pozicije nodusa od baze rodnog lastara, dolazi do smanjenja krupnoće grozda kod sorti Lasta, Karmen, Palatina, Esther i sorte Chasselas rose, a kod sorte Muscat St. Vallier do povećanja mase grozda.Utvrđena je značajna zavisnost mase grozda i pozicije pojave grozda na rodnom lastaru kod sorti Lasta, Muscat St. Vallier i Palatina

THE CHARACTERISTICS OF FRUITFULNESS OF SOME INTERSPECIES GRAPEVINE CULTIVARS

The results of important agro-biological and technological characteristics of three grapevine interspecies cultivars (Medina, Gecej Zamatos, and Kristala) are presented in this study. The following parameters were monitored: the total number of developed shoots, the number of fertile shoots, the number of bunch per vine, grape yield, fertility coefficient, the average bunch weight, yield per hectare, bunch and berry structural indicators and grape quality expressed through the content of sugar in must. Statistically significant differences were determined between the examined varieties regarding following characteristics: the number and yield of bunches per vine, structural indicators of berries and sugar content in must. The analysis of the obtained results related with the analyzed grape varieties in the agro-ecological conditions of Northern Bosnia showed that those varieties can successfully be cultivated in similar or identical agro-ecological conditions

Daily Eastern News: December 02, 1998

https://thekeep.eiu.edu/den_1998_dec/1001/thumbnail.jp

Biological Indication of Heavy Metal Pollution in the Areas of Donje Vlase and Cerje (Southeastern Serbia) Using Epiphytic Lichens

The performance of two epiphytic lichen species (Evernia prunastri (L.) Ach. and Parmelia sulcata Taylor) as bioindicators of heavy metal pollution in natural areas around the city of Nis (southeastern Serbia) were evaluated. The concentration of 19 heavy metals in lichen samples was measured by inductively coupled plasma-optical emission spectroscopy. For the majority of the elements the concentrations found in Parmelia sulcata Taylor were higher than in Evernia prunastri (L.) Ach. In addition, interspecific differences in heavy metal accumulation between Evernia prunastri (L.) Ach. and Parmelia sulcata Taylor are observed. Parmelia sulcata Taylor showed a tendency to accumulate Fe, Mn, Ni and Ti while Evernia prunastri (L.) Ach. preferentially concentrated Cu on both locations. A clear distinction between lithogenic (Mn-Cu-Ti) and atmospheric elements (Ni-Co-Cr-Ag-Pb-Hg) was achieved by cluster analysis

Application of some graph invariants to the analysis of multiprocessor interconnection networks

Let G be a graph with diameter D, maximum vertex degree Δ, the largest eigenvalue λ1 and m distinct eigenvalues. The products mΔ and (D+1) λ1 are called the tightness of G of the first and second type, respectively. In the recent literature it was suggested that graphs with a small tightness of the first type are good models for the multiprocessor interconnection networks. We study these and some other types of tightness and some related graph invariants and demonstrate their usefulness in the analysis of multiprocessor interconnection networks. Tightness values for graphs of some standard interconnection networks are determined. We also present some facts showing that the tightness of the second type is a relevant graph invariant. We prove that the number of connected graphs with a bounded tightness is finite

Some new models for multiprocessor interconnection networks

A multiprocessor system can be modeled by a graph G. The vertices of G correspond to processors while edges represent links between processors. To find suitable models for multiprocessor interconnection networks (briefly MINs), one can apply tools and techniques of spectral graph theory. In this paper, we extend some of the existing results and present several graphs which could serve as models for e cient MINs based on the small values of the previously introduced graph tightness. These examples of possible MINs arise as a result of some well-known and widely used graph operations. We also examine the suitability of strongly regular graphs (briefly SRGs) to model MINs, and prove the uniqueness of some of them

Determination of di(2-ethylhexyl) phthalate in plastic medical devices

The presence of DEHP in dialysis and infusion sets for peritoneal dialysis and parenteral nutrition, which are made of PVC and other plastic polymeric materials, were investigated. Phthalate determination was carried out by gas chromatography–mass spectrometry method (GC–MS). The results showed that the peritoneal dialysis set (bag and tubing) made of PVC contains DEHP in significant amount, about 31–34%. Solution for peritoneal dialysis which was stored in the investigated PVC bag, contains low amount of DEHP, about 3.72 µg dm–3. Infusion bottles which are made of LDPE, also contain DEHP but in lower amount than PVC bags. LDPE bottle for packaging physiological saline solution (0.9 % NaCl) showed higher amount of DEHP than LDPE bottle for packaging Ringer’s solution. In con-trast, solution stored in bottle with lower DEHP level, i.e., Ringer’s solution, contained about three times higher concentration of DEHP than physiological saline solution stored in bottle with higher DEHP level. Concentrations of DEHP in Ringer’s solution and physio-logical saline solution are 17.30 and 5.83 µg dm–3, respectively. The obtained values are under estimated upper-bound dose of DEHP received by adult patients undergoing pro-cedures of peritoneal dialysis and parenteral nutrition

EFFECT OF CLIMATIC PARAMETERS ON UVOLOGICAL CHARACTERISTICS OF VARIETY ’BLATINA’

The winegrowing hills of Mostar as part of the Herzegovinian winegrowing region have always been considered suitable for grapevine cultivation, mostly as a result of favorable soil and climatic conditions. Herzegovina is home to a range of ancient grapevine varieties assumed to be indigenous to Bosnia and Herzegovina, with only few of them being commercial. 'Blatina' is the most important indigenous variety in Bosnia and Herzegovina intended for red wine production. It develops functionally female flowers, and the success of its fertilization is largely dependent on climatic conditions. This paper provides the results of an analysis of major bunch and berry characteristics conducted over a three-year period. Research findings indicate a significant effect of environmental conditions on some uvological traits of the bunch and berry