bluuebunny/crossref_metadata_2025 huggingface dataset:
A new genus of nautiloid in the Toarcian of the Iberian peninsula (Spain and Portugal)
Authors: Barroso-Barcenilla Fernando , Comas-Rengifo María José , Duarte Luís Vítor , Goy Antonio , Martínez Gemma
Published: November 2011

Historically, most of the nautiloids arisen during the Early Jurassic have been assigned initially to the genus NautilusLinnaeus, 1758, and subsequently to CenocerasHyatt, 1884. At present, a tendency to rehabilitate other genera or to describe new ones predominates among the few authors who try to classify and to group these problematic cephalopods. In the present work, the new genus Ligeiceras has been described for remarkably small and involute nautiloids with notably retrogressive suture lines. It has a smooth or slightly ornamented external surface, limited to thin tenuous, ventraly retroverse and distant growth lines and longitudinal and transversal striae. This group, seemingly, appeared after the biotic crisis of the end of the Tenuicostatum/Polymorphum Zone, evolved during the radiation of the Early Toarcian Serpentinum/Levisoni Zone and the Late Toarcian, and survived at least until the Aalenian. New specimens from the Iberian peninsula (Basque-Cantabrian and Iberian basins, Spain; and Lusitanian basin, Portugal), belonging to the taxa Nautilus fournetiDumortier, 1874 (selected as type species), Nautilus inornatusd’Orbigny, 1843, Nautilus anomphalusPia, 1914, Nautilus jurensisQuenstedt, 1846-49, and, with doubts, Cenoceras globulusRulleau, 2008, have been collected, described and assigned to this systematic group. Although some of these species have already been cited in the literature, Ligeiceras fourneti, Ligeiceras jurensis and Ligeiceras? globulus have never been previously clearly described or illustrated, and their stratigraphic distribution has not been determined accurately for the Iberian peninsula, as has been done here for these taxa and for Ligeiceras inornatus and Ligeiceras anomphalus. Therefore, the present work on the new genus Ligeiceras constitutes a notable advance in the knowledge of these nautiloids, and seems to confirm that the dwarfism could have been a relatively generalized tendency in the Upper Toarcian of southwestern Europe, possibly due to palaeoenvironmental causes.
Taphonomic analysis and sequence stratigraphy of the Albarracinites beds (lower Bajocian, Iberian range, Spain). An example of shallow condensed section
Authors: Fernández-López Sixto Rafael
Published: November 2011

Several ammonite fossil assemblages from Sierra de Albarracín (Teruel, Castilian Branch) contain abundant specimens of the Ovale and Laeviuscula zones (lower Bajocian, Middle Jurassic), including microconchs and macroconchs of the characteristic genus Albarracinites. Over 1500 ammonites from the type horizon of the species A. albarraciniensis, in the outcrop of Masada Toyuela, have been studied.

Ammonites are commonly preserved as phosphatized, calcareous, concretionary internal moulds (mean size = 50.5 mm) of unflattened shells, partially or completely filled with relatively heterogeneous mudstone to wackestone sediment. Incomplete, fragmented phragmocones with calcitic septa are the dominant remains, generally bearing traces of rounding, incrustation and bioerosion. Taphonomic data, such as the predominant taphonomic populations of type 3, composed of reelaborated, relatively heterogeneous concretionary internal moulds, isolated concretionary body chambers and hollow ammonites, bearing traces of abrasion, bioerosion and encrusting organisms, are indicative of low rate of sedimentation and occasional high rate of sediment accumulation, due to sedimentary winnowing and bypassing interrupted by storm depositional events, in shallow-water marine environments. The exceptional occurrence of taphonic populations of type 2 belonging to Albarracinites and Hebetoxyites, with dominant shells of pre-adults and absence of juveniles, suggests autochthonous biogenic production of shells by indigenous populations of Sub-Mediterranean taxa at the Iberian platform system.

In the outcrop of Masada Toyuela, the Albarracinites beds correspond to a condensed section, developed in shallow-water, open-marine, carbonate environments of the External Castilian platform. The sharp, irregular base of beds and the normal grading of reworked elements suggest these carbonate deposits were affected by tractive currents, scouring and redeposition. Limestone beds represent storm-related sedimentary events, whereas the local marly intervals represent background-sedimentation time-intervals of winnowing and bypassing on the seafloor. This condensed section is composed of at least four, decimetric or centimetric, expanded-deposit intervals, stacked and showing an overall thinning upward, which constitute a deepening sequence developed during two biochrons. Taphonomic results also corroborate the development of an incipient-deepening phase, which represents the first episode of a deepening half-cycle of third order, in the Albarracín area within the Castilian platform, during the Ovale and Laeviuscula biochrons (early Bajocian).
Cenozoic tectonics of the Western Approaches Channel basins and its control of local drainage systems
Authors: Le Roy Pascal , Gracia-Garay Claire , Guennoc Pol , Bourillet Jean-François , Reynaud Jean-Yves , Thinon Isabelle , Kervevan Patrick , Paquet Fabien , Menier David , Bulois Cédric
Published: November 2011

The geology of the Channel Western Approaches is a key to understand the post-rift evolution of the NW European continental margin in relation with the Europe/Africa collision. Despite considerable evidence of Tertiary tectonic inversion throughout the Channel basin, the structures and amplitudes of the tectonic movements remain poorly documented across the French sector of the Western Approaches. The effect of the tectonic inversion for the evolution of the “Channel River”, the major system that flowed into the English Channel during the Plio-Quaternary eustatic lowstands, also needs to be clarified. Its drainage basin was larger than the present-day English Channel and constituted the source of terrigenous fluxes of the Armorican and Celtic deep sea fans. A lack of high-resolution seismic data motivated the implementation of the GEOMOC and GEOBREST cruises, whose main results are presented in this paper. The new observations highlight the diachronism and the contrast in amplitudes of the deformations involved in the inversion of the French Western Approaches. The tectonic inversion can be described in two stages: a paroxysmal Paleogene stage including two episodes, Eocene (probably Ypresian) and Oligocene, and a more moderate Neogene stage subdivided into Miocene and Pliocene episodes, driven by the reactivation of the same faults. The deformations along the North Iroise fault (NIF) located at the termination of the Medio-Manche fault produced forced folds in the sedimentary cover above the deeper faults. The tectonic inversion generated uplift of about 700 m of the mid-continental shelf south of the NIF. The isochron map of the reflectors bounding the identified seismic sequences clearly demonstrates a major structural control on the geometry of the Neogene deposits. First, the uplift of the eastern part of the Iroise basin during the upper Miocene favoured the onset of a broad submarine delta system that developed towards the subsiding NW outer shelf. The later evolution of the ’palaeovalley’ network corresponding to the western termination of the “Channel River” exhibits a ’bayonet’ pattern marked by a zigzagging pattern of valleys, with alternating segments orientated N040oE and N070oE, controlled by Neogene faulting. The palaeovalley network could have begun during Reurevian or Pre-Tiglian sea-level lowstands, which exposed the entire shelf below the shelf edge. The amplitude of the sea-level fall is assumed to have been magnified by uplift of the Iroise basin, followed by later tilting of the outer shelf, as observed in many other examples documented along the North Atlantic margins.
Grasshopper Injury to Potato: Consumption, Effect on Photosynthesis, and Economic Injury Level
Authors: Bastos Cristina , Whipple Sean D. , Hoback W. Wyatt , Higley Leon G.
Published: November 2011

Generalist grasshopper species feed at agricultural field edges, often triggering management practices because of defoliation injury. Few controlled studies in agroecosystems, however, have quantified grasshopper consumption or plant photosynthetic response to feeding. Consequently, we examined if injury caused by the red‐legged grasshopper Melanoplus femurrubrum (DeGeer), would influence the gas exchange parameters on the remaining tissue. We conducted this examination on three potato (Solanum tuberosum L.) cultivars (Norkotah, Atlantic, and Frito‐Lay proprietary) and at three times during potato growth (all post flowering). With injury rates of about 10 to 25%, we observed no significant change in photosynthetic rates on the remaining leaf tissue in any cultivar or in any of the three experiments. Additionally, we measured potato canopy area and, in the laboratory, placed individual M. femurrubrum on premeasured potato leaflets. Individual grasshoppers consumed a mean of 4.4 cm2 d−1 of leaf area. Early in the season when potato plant leaf area indices (LAIs) are less than about 4.5, grasshoppers have the potential to significantly reduce yield. When potato canopies reach LAIs of 5.0, however, which in Nebraska typically occurs in July when grasshopper numbers also increase, grasshopper densities are rarely high enough to justify treatment.
Corn Response to Harvest Date as Affected by Plant Population and Hybrid
Authors: Thomison Peter R. , Mullen Robert W. , Lipps Patrick E. , Doerge Tom , Geyer Allen B.
Published: November 2011

Many corn (Zea mays L.) growers in Ohio delay harvest as a management strategy for reducing grain drying costs. However, this practice increases the risk of yield loss due to extended crop weathering. Field studies were conducted at three Ohio locations in 2002 to 2004 to determine effects of three harvest date periods, early to mid‐October (HD1), early to mid‐November (HD2), and early to mid‐December (HD3), and four plant densities (59,000; 74,000; 89,000; and 104,000 plants ha−1) on the agronomic performance of four corn hybrids differing in maturity and stalk strength. Interactions between harvest date, plant population, and hybrid indicated that decreases in grain yield and increases in stalk rot and lodging associated with harvest delays were influenced by plant population and hybrid characteristics. Significant yield losses due to delayed harvest were evident only after HD2. When harvest was delayed until HD3, yields decreased at the higher plant populations, especially at 104,000 plants ha−1. Stalk rot and lodging increased at the higher plant populations, and this effect was magnified by late harvesting. Hybrids with lower stalk strength scores exhibited greater stalk lodging and yield loss when harvest was delayed beyond HD2. Stalk rot showed a greater increase between HD1 and HD2, whereas stalk lodging generally showed a greater increase after HD2. Harvest delays after HD2 achieved little or no additional grain drying. Results of this study indicate that harvest delays should be avoided when using plant populations above 74,000 plants ha−1, especially if planting hybrids that are not highly rated for stalk strength.
Controlled Warming Effects on Wheat Growth and Yield: Field Measurements and Modeling
Authors: Grant R. F. , Kimball B. A. , Conley M. M. , White J. W. , Wall G. W. , Ottman M. J.
Published: November 2011

Climate warming may raise wheat (Triticum aestivum L.) yields in cooler climates and lower them in warmer climates. To understand these contrasting effects, infrared heating lamps were used to warm irrigated spring wheat by 1.5°C (day) and 3.0°C (night) above unheated controls during different times of the year at Maricopa, AZ. Changes in wheat growth with warming were used to test hypotheses for temperature effects on crop growth in the process model ecosys. Infrared heating substantially raised phytomass growth and grain yield under lower air temperature (Ta) following plantings from September through December. The same heating, however, lowered growth and yield under higher Ta following plantings from January through March. Gains in wheat yield of as much as 200 g C m−2 with heating under lower Ta were attributed in the model to more rapid CO2 fixation and to reduced chilling effects on seed set. These gains were only partially offset by losses from shortened wheat growth periods. Losses in wheat yield of as much as 100 g C m−2 with heating under higher Ta were attributed in the model to adverse effects of heating on crop water status and on CO2 fixation vs. respiration, to greater heat stress effects on seed set, and to shortened crop growth periods. Model hypotheses thus explained contrasting effects of heating on wheat yields under different Ta found in the field experiment as well as in many earlier studies. Well‐constrained tests of these hypotheses are vital for models used to project climate change impacts on agricultural ecosystems.
Planting Date Affects Biomass and Brix of Sweet Sorghum Grown for Biofuel across Florida
Authors: Erickson J. E. , Helsel Z. R. , Woodard K. R. , Vendramini J. M. B. , Wang Y. , Sollenberger L. E. , Gilbert R. A.
Published: November 2011

Sweet sorghum [Sorghum bicolor (L.) Moench] is a potential bioenergy crop that is capable of high biomass and sugar yields, but production for biofuel in the Southeast is not well understood. The present study examined the effects of planting date (three dates from mid‐March to mid‐June) on primary and ratoon crop fresh biomass, brix, and estimated sugar yield of three sweet sorghum cultivars (‘Dale’, ‘Topper 76‐6’, and ‘M‐81E’) grown at three sites from North (29°24′ N) to South Florida (26°40′ N). Across all treatments, primary crop fresh biomass, brix and estimated sugar yields were 70 Mg ha−1, 148 g kg−1, and 5.69 Mg ha−1, respectively. Primary crop yields were greatest for the two earliest planting dates (mid‐March to mid‐May), and for our southernmost site. The yield potential for ratoon crops was in general only about half as much as the primary crop across all years, sites, and cultivars for the earliest planting date. An exception, however, was ratoon crop yields at the southernmost site, which were in some cases equal to or greater than primary crop yields. Low primary crop brix values were found for all cultivars on the muck soils in South Florida compared to the other two sites, and for M‐81E compared to Dale and Topper 76‐6. These low brix values were correlated with greater fresh biomass production. Further research is needed on planting dates for optimizing primary and ratoon crop yields along with varietal development with improved ratoon crop yields.
Optimal Nitrogen Fertilization Timing and Rate in Dry‐Seeded Rice in Northwest India
Authors: Mahajan G. , Chauhan B. S. , Gill M. S.
Published: November 2011

Dry‐seeded aerobic rice (Oryza sativa L.) (DSR) is an emerging production system in the northwest Indo‐Gangetic Plains (IGP) due to increasing constraints of labor and water availability. Very limited research has been done in this region on optimizing nutrient management to produce high yield in DSR. In this study, we investigated yield and dry matter of rice, and N translocation in response to timing and rate of N application. Nitrogen was applied in three splits (as per regional recommendation of transplanted rice) and four splits with or without N application at sowing time (basal dose) at rates of 120, 150, and 180 kg ha−1. The crop did not respond to increasing N levels from 120 to 180 kg ha−1 when applied in three splits. However, increasing N application to 150 kg ha−1 when applied in four splits with no N at sowing time resulted in 7.55 and 7.76 Mg ha−1 yields in 2009 and 2010, respectively; highest among all the treatments. Application of 150 kg N ha−1 in four splits with no‐N at sowing resulted in 9 to 12, 19 to 24, and 5% increase in panicle number m−2, filled grains panicle−1, and 1000‐grain weight, respectively, over the application of 120 kg N ha−1 in three split doses. The relative contribution of mean preanthesis assimilates to grain increased from 23% at 120 kg N ha−1 applied in three splits to 40% at 150 kg N ha−1 applied in four splits with no N at sowing, indicating that fertilizer application schedules for transplanted rice are not suitable for DSR. This study revealed that application of N at anthesis may further boost the productivity of DSR. From these results, it could also be inferred that, for DSR, application of N at sowing time can be skipped because it may not be immediately used by the emerging seedlings.
Use of Gypsum for Crop Grain Production under a Subtropical No‐Till Cropping System
Authors: Caires Eduardo F. , Garbuio Fernando J. , Churka Susana , Joris Hélio A. W.
Published: November 2011

Gypsum has been used in tropical and subtropical agriculture when subsoil acidity is an important yield‐limiting factor. However, the conditions that promote increased crop yield as a result of gypsum addition in no‐till (NT) systems still remain unclear. A field trial examined the effects of newly and previously surface‐applied gypsum in a long‐term NT system on the soil chemical properties and nutrition and yield of corn (Zea mays L.), wheat (Triticum aestivum L.), and soybean [Glycine max (L.) Merr.] on a clayey Rhodic Hapludox in Parana State, Brazil. Gypsum was surface‐applied at 0 and 6 Mg ha−1 in 2004 on plots that had received gypsum previously at 0, 3, 6, and 9 Mg ha−1 in 1998. Surface‐applied gypsum newly and previously improved exchangeable Ca and SO4–S availability throughout the soil profile, and increased the cumulative grain yield of the crops. Exchangeable K losses through leaching caused by gypsum application were low, and a larger mobility of exchangeable Mg as compared with exchangeable K in soil was found as a result of gypsum addition. An increase in Ca content in the corn, wheat, and soybean leaves, and in S content in the corn and wheat leaves occurred following the gypsum application. The use of gypsum showed economic viability to maximize crop grain production in a long‐term NT soil with a sufficient level of exchangeable Ca (≥8 mmolc dm−3) and low levels of exchangeable Al (≤4 mmolc dm−3) and Al saturation (≤15%) in the subsoil layers (20–60 cm).
Closure of an Open Wound Associated with Bisphosphonate-Related Osteonecrosis of the Jaw in a Breast Cancer Patient
Authors: Soolari Nafiseh , Soolari Ahmad
Published: November 2011

Background and Objective:

Many clinicians will not treat patients presenting with bisphosphonate-related osteonecrosis of the jaw following long-term use of bisphosphonates because of the lack of predictable outcomes.

Materical and Methods:

The patient presented with pain from a nonhealing lesion in the posterior maxilla following extraction of the maxillary right third molar. The lesion had not responded to any conventional dental treatment. The patient had suffered from breast cancer, and her treatment included several years of therapy with Zometa (zoledronic acid), a bisphosphonate.

Results:

The patient stopped taking Zometa and commenced rinsing with phosphate buffer–stabilized 0.1% chlorine dioxide–containing mouthwash. After 5 months, changes in the morphology of the lesion were noted and the soft tissue had closed over the open wound.

Conclusion:

Cessation of bisphosphonate therapy and usage of a phosphate buffer–stabilized 0.1% chlorine dioxide–containing mouthwash lessened the patient’s pain and resulted in closure of the soft tissue lesion.
Regional Climate Model Simulations of the 1998 Summer China Flood: Dependence on Initial and Lateral Boundary Conditions
Authors: Liu Shuyan , Liang Xin-Zhong , Gao Wei , He Yuxiang , Ling Tiejun
Published: November 2011

The dependence of the RegCM3 (Regional Climate Model version 3) downscaling skill on initial conditions (ICs) and lateral boundary conditions (LBCs) are investigated for the 1998 summer flood along the Yangtze River Basin in China. The effect of IC uncertainties is depicted by 15 realizations starting on each consecutive day from April 1 to 15 while all ending on September 1, 1998 with identical driving LBCs, analyses are based on June, July and August simulations. The result reveals certain IC effect on precipitation for daily evolution but little for summer mean geographical distribution. In contrast, the effect of LBCs uncertainties as represented by four different reanalyses are notably larger in both daily evolution and summer mean distribution. The ensemble average among either 15 IC realizations or 4 LBC runs does not show important skill improvement over the individuals. None of the RegCM3 simulations (including the ensemble means) captured the observed main rain band along the Yangtze River Basin. This
general failure suggests the need for further model physics improvement.
Intake Based Milk Allocation Improves Health and Growth of Calves
Authors: Halachmi I. , Shabtay A. , Asher A. , Agmon R. , Orlov A. , Mazaribe M. , Zuabi A. , Brosh A.
Published: November 2011

The problem:

The same feeding plan can be applied to all animals with individual differences rarely considered. On the contrary, individual intake-based feeding regime claims that if a calf has missed meals and therefore could not consume its daily milk allocation, it should be compensated.

Methods:

The objective of this study was (1) to compare ‘age-based milk allocation’ with calf individual ‘intake-based milk allocation’ (milk amount depending on the actual consumption). The study achieved its objective through the following phases (2) to design a real-time algorithm, (3) to embed the algorithm in the feeder’s control software, (4) unique mechanical design capable of the computer-controlled feeder.

One hundred and fifty male calves were fed. If a calf has not consumed its accumulated milk allocation from birth to date it receives an additional 1.5 liters (L) per day until it has consumed the entire planned amount.

Results:

Daily weight gain was 691 g/day in the age-based group vs. 794 g/day (SE = 36) in the intake-bared group. The average body weights (BW) at weaning were 76 kg vs. 82 kg. The indicator of health 57% vs. 66%.
On the probability stability of discrete-time control systems
Authors: Jovanovic Zoran , Dankovic Bratislav
Published: November 2011

The problem of probability stability discrete-time control system is considered. A method for stability estimation of the arbitrary order systems is given. Probability stability discrete-time control systems with random parameters are also analyzed.
Variable step-size LMS adaptive filters for CDMA multiuser detection
Authors: Egiazarian Karen , Kuosmanen Pauli , Bilcu Ciprian
Published: November 2011

Due to its simplicity the adaptive Least Mean Square (LMS) algorithm is widely used in Code-Division Multiple access (CDMA) detectors. However its convergence speed is highly dependent on the eigen value spread of the input covariance matrix. For highly correlated inputs the LMS algorithm has a slow convergence which require long training sequences and therefore low transmission speeds. Another drawback of the LMS is the trade-off between convergence speed and steady-state error since both are controlled by the same parameter, the step-size. In order to eliminate these drawbacks, the class of Variable Step-Size LMS (VSSLMS) algorithms was introduced. In this paper, we study the behavior of some algorithms belonging to the class of VSSLMS for training based multiuser detection in a CDMA system. We show that the proposed Complementary Pair Variable Step-Size LMS algorithms highly increase the speed of convergence while reducing the trade-off between the convergence speed and the output error.
Evaluation of a fault-tolerant call control system
Authors: Bozinovski Marjan , Gavrilovska Liljana , Prasad Ramjee , Schwefel Hans-Peter
Published: November 2011

The session initiation protocol (SIP) is the main signaling protocol in the 3GPP IP multimedia subsystem (IMS). The SIP sessions in IMS have to be highly reliable. The developed fault-tolerant SIP call control concept includes state-sharing mechanism, failure-detection and fail-over management. The state-sharing mechanism representing the core entity in the overall system has been developed to meet the specific SIP functional features and requirements for reliability of SIP services. Theoretical analysis and measurements in a prototype implementation showed that TFTP outperforms FTP.
On VHDL synthesis of self-checking two-level combinational circuits
Authors: Stankovic Tatjana , Stojcev Mile , Djordjevic Goran
Published: November 2011

Concurrent error detection (CED) is an important technique in the design of system in which dependability and data integrity are important. Using the separable code for CED has the advantage that no decoding is needed to get the normal output bits. In this paper, we address the problem of synthesizing totally self-checking two level combinational circuits starting from a VHDL description. Three schemes for CED are proposed. The first scheme uses duplication of a combinational logic with the addition of a totally self-checking comparator. The second scheme for synthesizing combinational circuits with CED uses Bose-Lin code. The third scheme is based on parity codes on the outputs of a combinational circuit. The area overheads and operating speed decreases for seven combinational circuits of standard architecture are reported in this paper.
Detection and recording of partial discharges below the so-called inception voltage
Authors: Danikas Michael , Prionistis Frixos
Published: November 2011

The problem of insulation damage from partial discharges below the so-called inception voltage has not attracted much attention from the insulation community. Indications of possible damage exist from previous research. In the present paper, the possibility of existence of such phenomena is investigated with small air gaps and non-uniform electrode arrangements. It is shown that random discharges below inception voltage exist, which on occasions can be quite numerous. Such discharges are registered and their implications are discussed.
High sensitivity photo receiver design
Authors: Bielecki Zbigniew , Kolosowski Wladyslaw , Sedek Edward
Published: November 2011

The paper describes low noise preampliers designed for optical detectors Analysis of operating conditions affecting signal-to-noise ratio has been carried out. Each preamplier was carefully optimized to work with particular type of the detector.
Spherical logarithmic quantization and its application for DPCM
Authors: Huber Johannes , Matschkal Bernd
Published: November 2011

A new method for efficient digitizing analog signals while preserving the original waveform as close as possible with respect to the relative quantization error is presented. Logarithmic quantization is applied to short vectors of samples represented in sphere coordinates. The resulting advantages, i.e. a constant Signal-to-Noise Ratio over a very high dynamic range at a small loss with respect to rate-distortion theory are discussed. In order to increase the Signal-to-Noise Ratio (SNR) by exploitation of correlations within the source signal, a method of combining differential pulse code modulation (DPCM) with spherical logarithmic quantization is presented. The resulting technique achieves an efficient digital representation of waveforms with a high long term as well as segmental SNR at an extreme low delay of the signal.
On the boundaries of the MIMO-channel-capacity with a focus on line-of-sight-connections
Authors: Chouayakh Mohamed , Knopp Andreas , Lankl Berthold
Published: November 2011

In this paper we show that geometric optimization is the most efficient way to reach maximum channel capacity when the channel is characterized by a powerful Line-Of-Sight signal component but it will result in larger antenna spacing than they are found customary. To have a quantitative criterion for comparison we firstly derive boundaries for the channel capacity when considering a pure Line-Of-Sight signal component. For finding the upper and lower bound we take into account signal pre-processing strategies in conjunction with systematic power allocation schemes. Having detected these bounds we calculate the capacity in the case of a linear antenna array spaced half-wavelength at both the transmitter as well as the receiver as it is commonly chosen in mobile communications. The capacity turns out adopting values close to the lower bound even if it is optimized best by means of signal processing and power allocation. On the contrary we present an exemplary geometrically optimized set of antenna elements, which is dedicated to reach the upper bound of the channel capacity.
An algorithm using genetic programming for the compensation of nonlinear distortion based on wiener system model
Authors: Xie Changsong , Xuhui Li
Published: November 2011

In this paper we presented an iteration algorithm using genetic programming (GP) to get the Wiener model of a nonlinear system and then to compensate the nonlinear distortion. The GP is used to identify the linear time-invariant (LTI) part and memory less nonlinear (MLNL) part of the Wiener model of the object system. By means of iteration, the identification precision will be improved gradually with the iteration steps. In order to compensate the non linearity a distortion compensation function (DCF) will be estimated also by means of GP. If the object system can be well described using Wiener model, this algorithm converges. The experiment results show that the compensation precision is fairly high.
Watermarking schema for digital still images based on geometrical transformation
Authors: Micic Aca , Nikolic Sasa , Stojanovic Vidosav
Published: November 2011

In real time watermarking applications robustness and computational complexity are playing very important role. In this paper we focus on new algorithm for inserting of watermark in digital still images. This algorithm is based on simple but efficient geometrical transformation of image and has fast embedding and extracting watermark pattern with acceptable robustness. Proposed method is illustrated on one example. It has been shown that it is possible to confirm existing of the watermark also in JPEG compressed image.
A novel approach for providing quality of service in multi service IP networks
Authors: Stojanovic Mirjana , Acimovic-Raspopovic Vladanka
Published: November 2011

Considering specific operational and corporate service requirements, this article proposes an approach for providing quality of service (QoS) in multi service networks based on the IP (Internet Protocol) technology. The basic elements of the proposed approach encompass DiffServ - aware QoS architecture, proposal for traffic classification, proposal for configuration of the data plane QoS implementation mechanisms, as well as the model of QoS control and management. Particularly, the proposed approach is applicable to private networks with specific operational and corporate needs (power utilities, traffic and transport, etc), which mandatory require different levels of QoS in order to assure stable and reliable system operation.
Presentation and simulation of computer architectures
Authors: Vojinovic Oliver , Milentijevic Ivan , Genov Dejan , Radulovic Aleksandar
Published: November 2011

Understanding modern computer architectures requires a good knowledge of the dynamic behavior of processors. A new alternative platform for creating and delivering presentations that successfully combines positive issues of both general and special-purpose presentation tools for computer architectures is proposed in this paper. Proposed platform introduces the concept of dynamic usage of data providers during the presentation and creating slide templates instead of slide creation. Originally developed presentation/simulation tool SimArch that implements almost all key features from the new platform is described. SimArch is designed for teaching/research purposes and devoted to description and visualization of computer architectures. Crucial novelties in SimArch related to involving of slide templates, behavior cases and selection of examples are demonstrated on examples based on MIPS architecture subsets.
Simulation of electrical tree propagation in a solid insulating material containing spherical insulating particle of a different permittivity with the aid of cellular automata
Authors: Vardakis George , Danikas Michael
Published: November 2011

The electrical tree propagation inside a solid insulating material is simulated in the present paper. The effect of a small insulating spherical particle inside the solid insulating material is investigated as far as the electrical field is concerned. Laplace's equation is solved inside the solid insulating material setting the boundary conditions around the spherical particle. An attempt for comparison between the simulation results and experimental data from the technical literature is being made, trying to shed light to the physical mechanisms that are involved in the phenomenon.
On the steady state of birth-death process with coefficients of moderate growth
Authors: Danielian Eduard , Astola Jaakko
Published: November 2011

The standard birth-death process with various forms of intensities (coefficients) is a source for obtaining natural skewed distributions which in turn are important in modeling different phenomena: the number of transcripts in eukaryotic cells, the number of words in a text, the number of citations of an author, etc. In these cases the coefficients of the respective birth-death process have moderate growth. The most general assumptions of growth for these cases are presented in this paper. These assumptions of moderate growth allow simplification of the well-known conditions for the existence of the steady state distribution of the process.
Calculation of selection probabilities of stack filters through BDD
Authors: Stojkovic Suzana , Astola Jaakko , Egiazarian Karen
Published: November 2011

This paper presents a procedure for calculation of selection probabilities of stack filters using Binary decision diagrams (BDDs) to represent the positive Boolean function that defines the stack filter. The procedure is derived by a modification of the spectral method for calculation of selection probabilities of stack filters. The usage of BDDs, instead of vectors overcomes the exponential complexity of the corresponding spectral method and extends application of the spectral method to stack filters with large windows widths.
An easy-to-use distributed framework for image processing
Authors: Pescaru Dan , Mocofan Muguras
Published: November 2011

In this paper an easy to use and still efficient parallel image processing framework is presented. The aim of this research is to provide a simply portable and efficient programming interface for these algorithms. Performances is gained using a message passing distributed model on the JPVM platform. Examples and experimental results where shown.
Level crossing rate of phase noise IM-DD optical systems in presence of interference
Authors: Pavlovic D.
Published: November 2011

In this paper the joint probability density function of the envelope and the first time derivative of envelope, and phase and first time derivative of phase for signals in IM-DD optical systems are derived. The level crossing rate and the average fade duration for envelope and phase of sine wave plus narrowband Gaussian noise are given. The envelope of signal and its derivative are independent. The first time derivative of the signals has Gaussian distribution. .
The influence of semi-spherical inhomogenity on the linear grounding system characteristics
Authors: Cvetkovic Nenad , Rancic Predrag
Published: November 2011

The influence of semi-spherical ground inhomogenity on quasistationary characteristics of linear grounding systems (LGS) was analyzed. For that purpose, firstly electric scalar potential (ESP) distribution in the vicinity of wire electrodes grounding system was determined. Afterwards, corresponding system of integral equations (SIE) was formed having distribution of leakage current from conductor surfaces as unknown function. The SIE is solved using Method of Moments (MoM). In deriving procedure of quasistationar expressions for ESP, quasistationary image theory in flat and modified image theory in spherical semi-conducting mirror are used. The application of proposed model is illustrated with many different examples of grounding systems.
An advanced method for active power flow control in electric power interconnections
Authors: Popovic Dragan
Published: November 2011

This paper presents an advanced method for active power flow control by use of static phase shifting transformer. It is based on non-standard load-flow model, which enables more accurate evaluation of the relevant technical effects of phase shifting transformer installation. For solution of the power flow control problem defined, the special fast decoupled procedure is developed. The high numerical efficiency and simplicity of this procedure has been established on the example of real interconnection formed by the Electric Power System of Serbia and Montenegro, Romania, Bulgaria, Former Yugoslav Republic of Macedonia, Greece and Albania (ex Second UCTE synchronous zone).
Comparison of compression ratios for ECG signals by using three time-frequency transformations
Authors: Ilic Sinisa
Published: November 2011

In this paper are presented compression results of ECG signal by using three time-frequency transformations: Discrete Wavelet Transform, Wavelet Packets and Modified Cosine Transform. By using transforms mentioned, samples of signals are transformed to appropriate groups of transformation coefficients. Almost all coefficients below the determined threshold are rounded to zero values and by inverse transform the similar signal to original one is created. By using run-length coder, consecutive zero value coefficients can be replaced by single value that shows how many consecutive coefficients with zero value exists. In this way small number of coefficients is stored, and compression is obtained. Depending on transform used, different number of coefficients is rounded to zero in different positions, hence the reconstructed signal is more or less similar to the original one. In general there exists measures that show how much reconstructed signal is similar to the original one, and the most used is Percentage Root mean square Difference (PRD). Comparison of compression is performed in obtaining the larger compression ratio for the smaller PRD.
Fingerprint minutiae filtering based on multiscale directional information
Authors: Popovic Brankica , Maskovic Ljiljana
Published: November 2011

Automatic identification of humans based on their fingerprints is still one of the most reliable identification methods in criminal and forensic applications, and is widely applied in civil applications as well. Most automatic systems available today use distinctive fingerprint features called minutiae for fingerprint comparison. Conventional feature extraction algorithm can produce a large number of spurious minutiae if fingerprint pattern contains large regions of broken ridges (often called creases). This can drastically reduce the recognition rate in automatic fingerprint identification systems. We can say that for performance of those systems it is more important not to extract spurious (false) minutia even though it means some genuine might be missing as well. In this paper multiscale directional information obtained from orientation field image is used to filter those spurious minutiae, resulting in multiple decrease of their number.
Most complex Boolean functions detected by the specialized normal form
Authors: Steinbach Bernd
Published: November 2011

It is well known that Exclusive Sum-Of-Products (ESOP) expressions for Boolean functions require on average the smallest number of cubes. Thus, a simple complexity measure for a Boolean function is the number of cubes in its simplest ESOP. It will be shown that this structure-oriented measure of the complexity can be improved by a unique complexity measure which is based on the function. Thus, it is suggested to detect all most complex Boolean functions more precisely by means of the Specialized Normal Form (SNF). The SNF is a unique (canonical) ESOP representation of a Boolean function. In this paper properties of the most complex Boolean functions are studied. Adjacency graphs of the SNF will be used to calculate minimal ESOPs as well as to detect special properties of most complex Boolean functions. These properties affect the procedure of finding exact minimal ESOPs. A solution is given that overcomes these observed problems. Using the SNF, the number of most complex Boolean functions was found. A recursive algorithm will be given that calculates each most complex Boolean function for a given number of variables.
Set-based SAT-solving
Authors: Steinbach Bernd , Posthoff Christian
Published: November 2011

The 3-SAT problem is one of the most important and interesting NP-complete problems with many applications in different areas. In several previous papers we showed the use of ternary vectors and set-theoretic considerations as well as binary codings and bit-parallel vector operations in order to solve this problem. Lists of orthogonal ternary vectors have been the main data structure, the intersection of ternary vectors (representing sets of binary solution candidates) was the most important set theoretic operation. The parallelism of the solution process has been established on the register level, i.e. related to the existing hardware, by using a binary coding of the ternary vectors, and it was also possible to transfer the solution process to a hierarchy of processors working in parallel. This paper will show further improvements of the existing algorithms which are easy to understand and result in very efficient algorithms and implementations. Some examples will be presented that will show the recent results.
An integrated approach for combining BDDs and SAT provers
Authors: Drechsler Rolf , Fey Görschwin , Kinder Sebastian
Published: November 2011

Many formal verification tools today are based on Boolean proof techniques The two most powerful approaches in this context are Binary Decision Diagrams (BDDs) and methods based on Boolean Satisfiability (SAT). Recent studies have shown that BDDs and SAT are orthogonal, i.e. there exist problems where BDDs work well, while SAT solvers fail and vice versa. Beside this, the techniques are very different in general. E.g. SAT solvers try to find a single solution and BDDs represent all solutions in parallel. In this paper the first integrated approach is presented that combines BDDs and SAT within a single data structure. This hybrid approach combines the advantages of the two techniques, i.e. multiple solutions can be computed while the memory requirement remains small. Experimental results demonstrate the quality of the approach in comparison to BDDs and SAT solvers.
Linearization of multi-output logic functions by ordering of the autocorrelation values
Authors: Keren Osnat , Levin Ilya
Published: November 2011

The paper deals with the problem of linear decomposition of a system of Boolean functions. A novel analytic method for linearization, by reordering the values of the autocorrelation function, is presented. The computational complexity of the linearization procedure is reduced by performing calculations directly on a subset of autocorrelation values rather than by manipulating the Boolean function in its initial domain. It is proved that unlike other greedy methods, the new technique does not increase the implementation cost. That is, it provides linearized functions with a complexity that is not greater than the complexity of the initial Boolean functions. Experimental results over standard benchmarks and random Boolean functions demonstrate the efficiency of the proposed procedure in terms of the complexity measure and the execution time.
Octoechos: A model and inspiration for Serbian medieval hymnographer
Authors: Subotin-Golubovic Tatjana
Published: November 2011

Octoechos is not merely a musical manual in everyday use during the service
in Orthodox Church, but also a comprehensive anthology of church poetry. It
contains poetical works of great Byzantine poets, such as John of Damascus,
Joseph the Hymnographer, Andrew of Crete. The use of Octoechos during the
service is strictly regulated by Typicon. After accepting the Orthodox rite,
the Slavs were acquainted with Octoechos which has undoubtedly made a great
impression on the attentive audiences present at the service. Octoechos has
also influenced the work of medieval Serbian hymnographers all of whom were,
as it is well known, pious men. The influence of the poetics typical of hymns
of the Octoechos has already been present in the Akoluthia to St. Simeon
written by St. Sava. In the hymnographical work of Theodosius this influence
is even more present, especially in his Canons on the eight modes (echoi)
that follow the pattern of the supplicatory canons of the Octoechos. Ephraim,
who was the Serbian patriarch in two turns (1375-1379, 1389-1392), wrote his
church hymns and prayers following those of the Octoechos. Ephraim composed
his stichera dedicated to Christ and Theotokos following the regular change
of tones of the Octoechos. The spirit of Octoechos has also marked the work
of the last Serbian anonymous hymnographers who wrote Akoluthia to the
Translation of the holy relics of Saint Apostle Luke to Serbia and the
Paraklisis to St. Luke (mid 15th century).
Chromaticism: A theoretical construction or a practical transformation?
Authors: Katsanevaki Athena
Published: November 2011

Chromaticism is a phenomenon which is shared by different musical cultures.
In the Balkans it is evident both in ecclesiastical and traditional music. In
antiquity it was attested by ancient Greek writers and was described in
theory. It is also apparent in different forms in ancient Greek musical
fragments. Nevertheless it is disputed whether it represents a theoretical
form (genus) or reflects a musical practice and its formation. Apart from any
theoretical analysis of ancient Greek testimony, ethnomusicology can
contribute to an explanation by classification and interpretation of various
forms in which chromaticism is found in the Balkans. In Northwestern Greece
many different forms can offer us various melodic paths that, if followed by
vocal or instrumental musical practice, result in special chromatic melodic
movements. Such movements reveal the genesis of tense chromatic and actually
reveal some implications about the differences between the two chromatic
shades (tense and soft) in traditional and ecclesiastical music.