Ćemal Višnjić

University of Sarajevo | UNSA · Faculty of Forestry

The forest plays an important role in regulating the water regime, i.e., preventing the occurrence of torrential floods, which depends on the type of trees that make up the stand, the canopy, age, and the structure of the stand. This paper examines the influence of the structural characteristics of the stand on the water regime, using the example...

Abstract Provenance experiments with forest trees provide valuable information about the growth and adaptability of population, often transferred from remote geographical regions and various climate conditions. This study researches the growth of nine provenances of silver fir from the area of its natural distribution in Bosnia and Herzegovina. The...

Provenance experiments with forest trees provide valuable information about the growth and adaptability of population, often transferred from remote geographical regions and various climate conditions. This study researches the growth of nine provenances of silver fir from the area of its natural distribution in Bosnia and Herzegovina. The experime...

Izvod U ovom radu su predstavljeni rezultati istra-živanja brojnosti, stepena oštećenosti, vitaliteta i načina pojavljivanja prirodnog podmlatka unu-tar šuma bukve i jele sa smrčom na planini Bje-lašnici. Istaživanja su provedena na dva lokali-teta unutar šuma bukve i jele sa smrčom na sje-vernim-sjeveroistočnim padinama Bjelašnice i to Ravna vala...

Poplavne šume tvrdih (lužnjak) i mekih (topola, vrba i joha) lišćara u Bosni i Hercegovini općenito su slabo očuvane. Najčešći razlog male očuvanosti su različiti negativni antropogeni uticaji, uglavnom zbog fragmentacije njihovih staništa za različite potrebe života ljudi: poljoprivreda, urbanizacija, razvoj transportne mreže (cestovne i zeljeznič...

Istraživanja su provedena unutar gospodarskih šuma bukve i jele sa smr-čom na Vranici, Grmeču i na Konjuhu. Na pomenutim planinama su unutar šuma bukve i jele s smrčom postavljene trajne eksperimentalne plohe oblika kvadrata, površine 1 hektara. Na svakoj trajnoj plohi je postavljena po 81 ploha kružnog oblika, radijusa 3 metra, na kojim je istraži...

U ovom radu istraživan je utjecaj različitih načina stratifikacije na energiju klijanja i klijavost sjemena paulovnije (Paulownia tomentosa). Istraživanje je provedeno u laboratoriji za sjemenarstvo Šumarskog fakulteta u Sarajevu. Sjeme paulovnije je sakupljeno u jesen 2014. godine sa stabla u parku ispred Šumarskog fakulteta. Nakon sakupljanja izv...

The paper represents a methodological approach in categorization of coppice beech stands in Sarajevo Canton area in relation to their ecological, productive, structural and silvicultural characteristics. For the collection of necessary data, method of temporary experimental surfaces, systematically allocated in squares 200 meters distant from each...

Istraživanje je provedeno na formiranom ogledu sa jelom u neposrednoj blizini Očevje-Olovo, sa devet provenijencija porijeklom iz prirodnih populacija BiH u starosti od 22 godine. U istraživanju su posmatrane sljedeće provenijencije: sastojine iz okoline Bugojna, Bos. Petrovca, Olova – Palež, Olova – Klis, Pala, Konjica, Fojnice, Sokoca i Prozora....

This paper compares the forest structure, regeneration and distribution of dead wood in a virgin forest remnant and a close-to-nature managed beech–conifer mixture situated on Grmeč Mountain in Western Bosnia. The investigations were carried out in a 1 ha permanent sample plot and 35 circular plots (20 m radius) in the virgin forest and in 17 circu...

This paper compares the forest structure, regeneration and distribution of dead wood in a virgin forest remnant and a close-to-nature managed beech–conifer mixture situated on Grmeč Mountain in Western Bosnia. The investigations were carried out in a 1 ha permanent sample plot and 35 circular plots (20 m radius) in the virgin forest and in 17 circu...

Studies of old-growth forests are becoming increasingly important for the improvement of silviculture and for understanding environmental changes. However, in Europe such forests are rare, fragmented and influenced by millennia of human activity. Comparative studies of old-growth forests across Europe are needed to improve knowledge on how direct a...

Studies of old-growth forests are becoming increasingly important for the improvement of silviculture and for understanding environmental changes. However, in Europe such forests are rare, fragmented and influenced by millennia of human activity. Comparative studies of old-growth forests across Europe are needed to improve knowledge on how direct a...

Beech, silver fir and Norway spruce mountain forests represent one of major forest types in east and southeast Europe. They are well preserved since they were less influenced by humans compared to lowland or high mountain forests. The majority of European old-growth forests lie in this region, while productive forests are often managed by unevenage...

The Atacama B‐mode Search (ABS) experiment is a 145 GHz polarimeter designed to measure the B‐mode polarization of the Cosmic Microwave Background (CMB) at large angular scales. The ABS instrument will ship to the Atacama Desert of Chile fully tested and ready to observe in 2010. ABS will image large‐angular‐scale CMB polarization anisotropies on...

The next generation of Cosmic Microwave Background (CMB) experiments probing for signals of inflation and small angular scale polarization anisotropies require higher sensitivity and better control of systematics. We are developing monolithic arrays of orthomode transducer (OMT) coupled transition edge sensor (TES) polarimeters designed for operati...

Background and Purpose: In this paper was researched the morphological variability of seed and one-year seedlings of beech of different proveniences from the major part of its natural dispersing in Bosnia and Herzegovina (from the Bužim, Bugojno, Banja Luka, Bosansko Grahovo, Posušje and Olovo). Material and Methods: There were researched: length (...

We are developing feedhorn‐coupled TES polarimeters to measure the polarization anisotropies of the cosmic microwave background (CMB) radiation. These devices will be deployed in arrays of hundreds to thousands and will be measured using multiplexed SQUID readout electronics. Since multiplexed devices share common circuitry, a high degree of unifor...

We present results from modeling the electrothermal performance of feedhorn-coupled transition edge sensor (TES) polarimeters under development for use in cosmic microwave background (CMB) polarization experiments. Each polarimeter couples radiation from a corrugated feedhorn through a planar orthomode transducer, which transmits power from orthogo...

We present data characterizing the optical properties of feedhorn-coupled TES polarimeters useful for future CMB measurements. In this detector architecture, TES bolometers are coupled to radiation through superconducting microstrip to a planar ortho-mode transducer inserted into waveguide. Filters in the microstrip define the pass bands for the de...

Izvod Na lokalitetu „Delimusa“ odjel 86, gospodarska jedinica „Krivaja“ na ŠPP „Olovsko“, podignuta je eksperimentalna ploha jele sa devet provenijencija. Analizirali smo broja iglica po cm dužnom po provenijencijama, dužine i širine iglica po provenijencijama i učešće iglica prema starosti. Za sva svojstva analiza varijanse, kao i Duncanov test s...

We present simulations and discuss measurements of a planar orthomode transducer (OMT) being developed for use with bolometric detectors in observations of the polarization of the cosmic microwave background (CMB). This OMT couples radiation from a circular waveguide onto microstrip where it is filtered and then detected. A corrugated feed horn def...

The next generation of cosmic microwave background (CMB) polarization experiments targeting the signatures of inflation will require unprecedented sensitivities in addition to careful control of systematics. With existing detector technologies approaching the photon noise limit, improvements in system sensitivities must come from ever-larger focal...

On the "Delimusa" section 86, economic units "Krivaja" the SPP "Olovsko", was built experimental plane regular fir with nine provenaence. We analyzed the number of needles per cm by provenience, the length and width of needles by provenience and the participation of needles according to age. The results of the number of needles per cm and the lengt...

Silver fir (Abies alba Mill.) is the most significant and economically most important conifer species in Bosnia and Herzegovina, and due attention needs to be dedicated to it. The trial surface was established in the Olovo area, with nine silver fir provenances descending from natural populations. For the trial we used the following provenances: B...

Pokusna površina „Delimusa“ smještena je u odjel 86, gospodarske jedinica „Krivaja“ u ŠPP „Olovsko“, podignuta je 1991. godine u cilju eksperimentalne rajonizacije obične jele u Bosni i Hercegovini. U ovaj pokus uključeno je devet provenijencija, koje predstavljaju izdvojene sjemenske objekte. U istraživanju smo analizirali prosječni periodični vis...

Virgin forests are relatively rare in the European temperate zone. This is due to the continuous use of forest historically and to increasing high population densities. Virgin forests are forest where the structure and dynamics have developed entirely under natural conditions, without any human interference or influence. This article assesses the P...

Veći dio planova razvoja šumarstva odnosi se na povećanju raspoložive sječive mase drveta. Između ostalih značajno mjesto je rezervirano za metodu uvećanja mase kroz aktivnosti koje se naslanjaju na konverziju niskih šuma. Prije svega radi se o niskim šumama sa veoma slabim prirasnim mogućnostima, na staništima velike proizvodne sposobnosti. Usljed...

Istraživana je proizvodnost običnog bora u pokusu „Vis“ kod Tarčina. Pokus je podignut u tipičnoj degradiranoj bukovoj šumi, na kiselim smeđim tlima. To je inače tipično stanište bukve u središnjoj Bosni, a koje se vrlo često pokušava prevesti direktnom konverzijom sa običnim borom u visoki uzgojni oblik. Provedenim istraživanjima analizirani su pa...

Obična jela (Abies alba Mill.) je najznačajnija vrsta među četinarima u Bosni i Hercegovini. Eksperiment je podignut na području SP ,,Olovsko", a devet provenijencija jele je sa područja Bugojna, Bos. Petrovac; Olovo - Palež, Pala, Konjica, Fojnice, Sokolca, Olovo - Klis i Prozor. Cilj ovog istraživanja je da određenim metodama utvrdimo među-popula...

We report on the first measurement of 39Ar in argon from underground natural gas reservoirs. The gas stored in the US National Helium Reserve was found to contain a low level of 39Ar. The ratio of 39Ar to stable argon was found to be ≤4×10-17 (84% C.L.), less than 5% the value in atmospheric argon (39Ar/Ar=8×10-16). The total quantity of argon curr...

We report on the first measurement of 39Ar in argon from underground natural gas reservoirs. The gas stored in the US National Helium Reserve was found to contain a low level of 39Ar. The ratio of 39Ar to stable argon was measured to be ⩽4×10-17 (84% C.L.), less than 5% the value in atmospheric argon (39Ar/Ar=8×10-16). The total quantity of argon c...

We report on the first measurement of 39 Ar in argon from underground natural gas reservoirs. The gas stored in the US National Helium Reserve was found to contain a low level of 39 Ar. The ratio of 39 Ar to stable argon was found to be ≤4×10 −17 (84% C.L.), less than 5% the value in atmospheric argon (39 Ar/Ar=8×10 −16). The total quantity of argo...

Struktura sastojine u uzgojnom pogledu obuhvata prostorni raspored drveća, grmlja i prizemne vegetacije kao strukturnih obilježja sastojine (DENGLER, 1992). " Struktura je definisana preko pozicije stabla, prečnika stabala, vrsnog diverziteta i vertikalne strukture u pogledu spratovnosti. Ova strukturna obilježja su pod utjecaj em uzgojnih mjera i...

The research objective for this study was to investigate the fir plantations’ timber yield in the eroded beech-forest belt located on the acidic brown soil type of mid Bosnia. Special emphasis was placed on the effect the fir tree density per hectare of soil exerts on the quantity and quality of the plantation itself. The research also encompasses...

This paper includes investigations on 9-year-old plants of 16 European beech provenances (fig. 1). The plantation was established in 1991 with two-year-old container seedlings from Germany, central and southern Italy, from Bosnia and Herzegovina, Slovenia and Romania (tab. 1). The aim of the research was to gain indicators on resistance of the beec...

This study was carried out on two standing inspection sites in the area of 1ha located in the protection beech forest Tisovac and the primary beech forest Kakanj. The objective of the study was to compare structures of these forests and to determine the regulating measures for managing beech forests based on the data obtained. In this study we pres...

Im Urwaldreservat "Ravna vala" bei Sarajevo (Bosnien-Herzegowina) wurden in einem Bestand des Abieti-Fagetum illyricum epiphytische und Totholz bewohnende Moose und Flechten erfasst. Bodenbewohnende Arten spielen im Gebiet nur eine äußerst untergeordnete Rolle und wurden nicht aufgenommen. Auf einer 1 ha großen Untersuchungsfläche konnten insgesamt...