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Search Results: 1 - 10 of 1994 matches for " Petr Heneberg "
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Effects of Print Publication Lag in Dual Format Journals on Scientometric Indicators
Petr Heneberg
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0059877
Abstract: Background Publication lag between manuscript submission and its final publication is considered as an important factor affecting the decision to submit, the timeliness of presented data, and the scientometric measures of the particular journal. Dual-format peer-reviewed journals (publishing both print and online editions of their content) adopted a broadly accepted strategy to shorten the publication lag: to publish the accepted manuscripts online ahead of their print editions, which may follow days, but also years later. Effects of this widespread habit on the immediacy index (average number of times an article is cited in the year it is published) calculation were never analyzed. Methodology/Principal Findings Scopus database (which contains nearly up-to-date documents in press, but does not reveal citations by these documents until they are finalized) was searched for the journals with the highest total counts of articles in press, or highest counts of articles in press appearing online in 2010–2011. Number of citations received by the articles in press available online was found to be nearly equal to citations received within the year when the document was assigned to a journal issue. Thus, online publication of in press articles affects severely the calculation of immediacy index of their source titles, and disadvantages online-only and print-only journals when evaluating them according to the immediacy index and probably also according to the impact factor and similar measures. Conclusions/Significance Caution should be taken when evaluating dual-format journals supporting long publication lag. Further research should answer the question, on whether the immediacy index should be replaced by an indicator based on the date of first publication (online or in print, whichever comes first) to eliminate the problems analyzed in this report. Information value of immediacy index is further questioned by very high ratio of authors’ self-citations among the citation window used for its calculation.
Processing and Unification of Environmental Noise Data from Road Traffic with Spatial Dimension Collected through Mobile Phones  [PDF]
Petr Duda
Journal of Geoscience and Environment Protection (GEP) , 2016, DOI: 10.4236/gep.2016.413001
Abstract: Noise measurement using mobile phones is now developed very well. While there are some good applications for the measurement of noise from road traffic, thus on processing of measured data is only paid a very little attention. The data, however, are burdened by specific errors and for further work with them it is necessary to adjust and determine their uncertainty. One of the biggest problems is inaccuracy in position versus the noise source and the shortest length of measurement that can be regarded as representative. Imprecision in terms of location can be determined by calculating the variance of possible distance from the noise source, which for measurement of traffic noise requires a map-matching data points both transverse to the street (sidewalk) network and in the longwise direction. During typical urban measurements, this error can even reach 7 - 10 dB. Three basic types of algorithms for the calculation of uncertainty and positional correction based on the type of input and output data (raster, vector, vector-oriented) were tested. Uncertainty in the variability of the measurement data is necessary to determine from the number of passing vehicles per time unit. The presented solutions are implemented in the Mobile Noise system.
Synthesis of PMMA-co-PMAA Copolymer Brush on Multi-Wall Carbon Nanotubes  [PDF]
Petr Slobodian, Petr Svoboda, Pavel Riha, Petr Saha, Roman Boruta
Journal of Surface Engineered Materials and Advanced Technology (JSEMAT) , 2012, DOI: 10.4236/jsemat.2012.223034
Abstract: Poly(methyl methacrylate)/poly(methacrylamide) copolymer (PMMA-co-PMAA) was synthesized by a free radical copolymerization of MMA and MAA monomers in methylethyl ketone using AIBN as radical initiator. Multi-wall carbon nanotubes (MWCNT) were oxidized in KMnO4 acidic suspension. Carboxyl groups on the surface oxidized MWCNT were reacted with primary amide group of PMMA-co-PMAA copolymer in MEK solution under ultrasound to form polymer brush on the surface of MWCNT. With the help of TG analyses the amount of covalently grafted PMMA-co-PMAA copolymer onto MWCNT surface was determined as ?47 wt%. TEM analyses identified thin co-polymer layer adhered onto MWCNT surface with average thickness ?5 nm.
A Study of the Behavior of Alkyl Side Chains Phenols and Arenes in Polar and Nonpolar GC Stationary Phases  [PDF]
Pavel Straka, Petr Buryan
American Journal of Analytical Chemistry (AJAC) , 2011, DOI: 10.4236/ajac.2011.23040
Abstract: Gas chromatographic measurements of the relative retention times of alkyl-substituted arenes and phenols on capillary columns at temperatures of 125 – 140°C have shown that logarithms of retention times increase bilinearly with the number of carbon atoms in the molecule. It was found that in a high density stationary phase, the longer alkyl side chains of compounds in question are subject to cyclization as a result of the resistance force of this phase affecting molecules during their thermal and diffusion motion. Consequently, common conventional aromatic-aliphatic molecules become new molecules with quasi-alicyclic rings. In comparison with the conventionally conceived molecules, the resulting aromatic–quasi-alicyclic molecules are characterized by rather different, possibly even completely different non-covalent interactions between the molecules, which then affect the retention characteristics. Moreover, cyclization facilitates the mixing of n-alkyl arenes and n-alkyl phenols with high-molecular stationary phases, because the thermodynamic condition for mixing is better fulfilled.
Sexual Reproduction One Billion Years Ago  [PDF]
Petr N. Kolosov
Natural Resources (NR) , 2013, DOI: 10.4236/nr.2013.45047
Abstract:

The facts regarding to the early stages of algae evolution in the Precambrian are very rare (more than 542 million years ago). In this paper, the author describes the first discovered evidence that the sexual reproduction process took place one billion years ago. As it is known, sexual reproduction led to the diversity of living organisms on the Earth, and in general, accelerated the evolution process.

Primitive Mammoth Hunters and the Earliest Breed of Dog  [PDF]
Petr N. Kolosov
Natural Resources (NR) , 2014, DOI: 10.4236/nr.2014.53011
Abstract:

Primitive man have managed to survive in the rigorous climatic conditions of the arctic regions in northeast Asia owing to the hunting for mammoth, bison, wooly rhinoceros and other Pleistocene mammals with the assistance of the laika, a domesticated wolf. This is how the colonization of the Arctic began. The domestic dog appeared in this region about 25 - 30 thousand years ago as a result of the severe climatic conditions in which both hunting tribes and the ancestors of the domestic dog had to live. A wolf is a predator, an able hunter. Therefore, most likely wolves were originally trained to hunt with humans—the leaders of the hunting pack. Thus, in northeast Asia, there was a direct relationship between man’s colonization of the Arctic, the appearance of the hunting dog, and a decrease in the number of mammoth, bison, and other large animals in the region, as a result of hunting when whole herds were killed.

Another Understanding of the Model of Genetic Code Theoretical Analysis  [PDF]
Petr Petrovich Gariaev
Open Journal of Genetics (OJGen) , 2015, DOI: 10.4236/ojgen.2015.52008
Abstract: At present the model of the genetic code (the code of protein biosynthesis) proposed almost 50 years ago by M. Nirenberg and F. Crick has undergone severe erosion. Tactically, it is true that triplicity and the synonymous degeneracy are unmistakable. But the Nirenberg-Crick postulate about unambiguous coding of amino acids, i.e., the strategy raises reasonable doubt. The reasons to doubt showed up very early: it turned out that the triplet UUU codes both phenylalanine and leucine, which was inconsistent with the declaration of the unambiguity of the DNA-RNA encoding of amino acids in proteins. On the other hand, the ambiguity automatically stems from the Wobble Hypothesis by F. Crick relating to the wobbling of the third nucleotide in codons, (random, undetermined behavior), which means the 3’-5’ codon-anticodon pair is not involved in the encoding, and represents a “steric crutch”. In fact, amino acids are coded not by triplet, but by doublet of nucleotides in a triplet, according to “Two-out-of-Three” rule by Ulf Lagerkvist. From this perspective, the codon families split into two classes: 32 codon-synonym triplets and 32 codon triplets with undetermined coding functions, that is inherent to one of the 32 codons UUU. These “undetermined” codons have called homonyms. They are ambiguous as they potentially and simultaneously encode two different amino acids, or amino acid and the stop function. However, the ambiguity is overcome in real protein biosynthesis. This is due to the sign orientations of ribosomes within mRNA contexts. This is the way the semantics of the codon-homonyms occur, as an exact analogy of the consciousness work in the human languages, abounding with homonyms. This turn in the understanding of the protein code, as actual text formation, leads to a strong idea of the genome as a quasi-intelligent biocomputer structure of living cells. Ignoring this leads to erroneous and dangerous works of genetic engineering, the most important results are Synthia bacteria with synthetic genome and GM foods. Protein biosynthesis is a key, but not the only basic information function of chromosomes. There are other, no less important, holographic and quantum non-locality functions related to morphogenesis. In this plane, the work of the genome, as a quantum biocomputer, occurs on the wave level. Here the main function is regulatory quantum broadcasting of genetic-metabolic information on the intercellular, tissue and organism levels using a coherent photon DNA radiation and its nonlinear vibrational states (sound). DNA information presents itself in
Domain decomposition methods with overlapping subdomains for time-dependent problems
Petr Vabishchevich,Petr Zakharov
Computer Science , 2014,
Abstract: Domain decomposition (DD) methods for solving time-dependent problems can be classified by (i) the method of domain decomposition used, (ii) the choice of decomposition operators (exchange of boundary conditions), and (iii) the splitting scheme employed. To construct homogeneous numerical algorithms, overlapping subdomain methods are preferable. Domain decomposition is associated with the corresponding additive representation of the problem operator. To solve time-dependent problems with the DD splitting, different operator-splitting schemes are used. Various variants of decomposition operators differ by distinct types of data exchanges on interfaces. They ensure the convergence of the approximate solution in various spaces of grid functions.
Words for the Animal Elephant/Mammoth in Relation to the DNA Genealogy Data  [PDF]
Petr Jandá?ek, Anton Perdih
Advances in Anthropology (AA) , 2017, DOI: 10.4236/aa.2017.74014
Abstract: The onomatopoetic Mongol word for the animal elephant, zaan, reflects the primordial Eurasian word for the trumpeting animal mammoth. Subsequently it had diversified into the many variants such as slen, sian, sion, san, chan, slon, silonit, glan, zilonis, zihon, zo, masan, tsonoqua and many other local forms. The endings and are characteristic for Europe, whereas is characteristic for East Asia. Exceptions to this continuum are the Cambodian (Khmer) word damri and the Lithuanian (Baltic) word dramblys. DNA Genealogy and geophysical data indicate that about 68,000 years ago the people having the Y Chromosome haplogroups A00, A0, A1a, A1b1, and B survived on the East African highlands and spread later across Africa, whereas in the area of Alps and Balkans in Europe there survived the people having the Y Chromosome haplogroups BT and CT, whose descendants subsequenly split into the Y Chromosome haplogroups C through T, which in time spread all over the world. This may be the source of the observed
The Compound Spectral Indices of Human Stress  [PDF]
Petr Kloucek, Armin Von Gunten
Applied Mathematics (AM) , 2018, DOI: 10.4236/am.2018.912090
Abstract:
Temporally fine-grained and objective measures of mental states or their surrogate states are desperately needed in clinical psychiatry. Stress, both acute and especially chronic stress, is an important mental and physiological state observed in many mental disorders. It is a potential precipitant of acute psychiatric decompensations, be they anxious, affective, psychotic, or behavioural. Thus, being able to objectively follow stress or its surrogate parameters over time in a clinician-friendly way would help predict and prevent decompensations and monitor subsequent treatment success. Thus, we introduce the Compound Spectral Stress Indices (CSSI) that are derived from sensing data of various physiological and physiological and behavioural parameters we use as surrogate stress measures. To obtain the CSSI we use a hierarchical approach provided by adaptability, congruency and derived stress coefficient matrices. Adaptability is defined as a macroscopic characterisation of physiological and physiological and behavioural performance constructed as a product of the total variation of time-segmented complexity indices multiplied by the frequency of the time-varying distribution of complexity indices of the measured physiological or physiological and behavioural parameters, where complexity is expressed in terms of the Hurst exponent. Congruency is expressed by a constant characterising a demand-resource balance and it is then expressed in the form of a stress coefficient matrix. The CSSI is given by the spectral distance of the stress coefficient matrices from the ideal demand-resource matrix.
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