224 research outputs found
Thermalization of gluons at RHIC: Dependence on initial conditions
We investigate how thermalization of gluons depends on the initial conditions
assumed in ultrarelativistic heavy ion collisions at RHIC. The study is based
on simulations employing the pQCD inspired parton cascade solving the Boltzmann
equation for gluons. We consider independently produced minijets with GeV and a color glass condensate as possible initial
conditions for the freed gluons. It turns out that full kinetic equilibrium is
achieved slightly sooner in denser system and its timescale tends to saturate.
Compared with the kinetic equilibration we find a stronger dependence of
chemical equilibration on the initial conditions.Comment: 8 pages, 4 figures; Contribution to Proceedings of the Quark-Gluon
Plasma Thermalization workshop, Vienna, Austria, August 10-12, 200
Graphene nanoribbons with zigzag and armchair edges prepared by scanning tunneling microscope lithography on gold substrates
The properties of graphene nanoribbons are dependent on both the nanoribbon width and the crystallographic orientation of the edges. Scanning tunneling microscope lithography is a method which is able to create graphene nanoribbons with well defined edge orientation, having a width of a few nanometers. However, it has only been demonstrated on the top layer of graphite. In order to allow practical applications of this powerful lithography technique, it needs to be implemented on single layer graphene. We demonstrate the preparation of graphene nanoribbons with well defined crystallographic orientation on top of gold substrates. Our transfer and lithography approach brings one step closer the preparation of well defined graphene nanoribbons on arbitrary substrates for nanoelectronic applications
Species Composition of Indigenous Trichoderma Fungi Affected by Cd,Ni and Zn Heavy Metals in Calcareous Chernozem Soil
Different sensing mechanisms in single wire and mat carbon nanotubes chemical sensors
Chemical sensing properties of single wire and mat form sensor structures
fabricated from the same carbon nanotube (CNT) materials have been compared.
Sensing properties of CNT sensors were evaluated upon electrical response in
the presence of five vapours as acetone, acetic acid, ethanol, toluene, and
water. Diverse behaviour of single wire CNT sensors was found, while the mat
structures showed similar response for all the applied vapours. This indicates
that the sensing mechanism of random CNT networks cannot be interpreted as a
simple summation of the constituting individual CNT effects, but is associated
to another robust phenomenon, localized presumably at CNT-CNT junctions, must
be supposed.Comment: 12 pages, 5 figures,Applied Physics A: Materials Science and
Processing 201
Generalized thermodynamic uncertainty relations
We analyze ensemble in which energy (E), temperature (T) and multiplicity (N)
can all fluctuate and with the help of nonextensive statistics we propose a
relation connecting all fluctuating variables. It generalizes Lindhard's
thermodynamic uncertainty relations known in literature.Comment: 13 pages, 2 figures, version to occur in Physica A (2011);
doi:10.1016/j.physa.2011.05.00
Opposite tendency between yield and taste of organic tomato by increasing biochar doses in a slightly humous arenosol
Received: February 4th, 2022 ; Accepted: April 6th, 2022 ; Published: April 28th, 2022 ; Correspondence: [email protected] tomato is the edible berry of the plant Solanum lycopersicum. Tomato plants are
widely grown in temperate climates worldwide and are mostly cultivated as annuals. The
objective of this study was to understand the interrelation between fruit quality of tomato, some
soil biological parameters, and the addition of increasing biochar (BC) soil amendment doses.
BC is an industrial product, made from organic waste by pyrolysis. Its use in the soil is known to
improve fertility and several soil functions. Among organic, ecological conditions, a field
experiment was performed in a type of slightly humous arenosol soil. Effect of increasing doses
of biochar (BC) (0.5-, 1.0-, 2.5-, 5.0, 10 m/m% and control) was studied. Nutrient content and
Total Soluble Solid (TSS) of the fruits, the ripeness, and the marketable/non-marketable ratio of
yield were assessed. The presence of some cultivable microbial physiological groups (fungi,
bacteria) and the soil-dehydrogenase activity (DHA) was estimated. Results represented that the
changes of fruit TSS content was not linear with the increasing doses of BC. The increased yield
(+53%) had an inverse correlation with the TSS content of the berry's pulps, and the content was
lowest at the highest BC dose. Optimum doses of BC were considered, like 1–2.5 m/m%,
supported by the nutritive element content (+55% N, +76% P, +83% K) and enhanced microbial
activities (+45% DHA). Grouping the parameters by Pearson Correlation Coefficient, the biochar
amendment was a driving factor for tomato growth, with certain dose limits in the studied organic
agricultural practice
Canonical Ensemble of Initial States Leading to Chiral Fluctuations
In energetic heavy ion collisions, if quark-gluon plasma is formed, its
hadronization may lead to observable critical fluctuations, i.e., DCC
formation. The strength and observability of these fluctuations depend on the
initial state. Here we study the canonical ensemble of initial states of chiral
fluctuations in heavy ion collisions and the probability to obtain observable
domains of chiral condensates.Comment: 13 pages (figures included) Accepted for publication in Phys. Rev.
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