Transport Stream Research Articles

Aspects regarding at 13C isotope separation column control using Petri nets system

This paper is intended to show that Petri nets can be also applicable in the chemical industry. It used linear programming, modeling underlying Petri nets, especially discrete event systems for isotopic separation, the purpose of considering and control events in real-time through graphical representations. In this paper it is simulate the control of 13C Isotope Separation column using Petri nets. The major problem with 13C comes from the difficulty of obtaining it and raising its natural fraction. Carbon isotopes can be obtained using many methods, one of them being the cryogenic distillation of carbon monoxide. Some few aspects regarding operating conditions and the construction of such cryogenic plants are known today, and even less information are available as far as the separation process modeling and control are concerned. In fact, the efficient control of the carbon monoxide distillation process represents a necessity for large-scale 13C production. Referring to a classic distillation process, some models for carbon isotope separation have been proposed, some based on mass, component and energy balance equations, some on the nonlinear wave theory or the Cohen equations. For modeling the system it was used Petri nets because in this case it is deal with discrete event systems. In use of the non-timed and with auxiliary times Petri model, the transport stream was divided into sections and these sections will be analyzed successively. Because of the complexity of the system and the large amount of calculations required it was not possible to analyze the system as a unitary whole. A first attempt to model the system as a unitary whole led to the blocking of the model during simulation, because of the large processing times.

Acoustic streaming, fluid mixing, and particle transport by a Gaussian ultrasound beam in a cylindrical container

A computational study is reported of the acoustic streaming flow field generated by a Gaussian ultrasound beam propagating normally toward the end wall of a cylindrical container. Particular focus is given to examining the effectiveness of the acoustic streaming flow for fluid mixing within the container, for deposition of particles in suspension onto the bottom surface, and for particle suspension from the bottom surface back into the flow field. The flow field is assumed to be axisymmetric with the ultrasound transducer oriented parallel to the cylinder axis and normal to the bottom surface of the container, which we refer to as the impingement surface. Reflection of the sound from the impingement surface and sound absorption within the material at the container bottom are both accounted for in the computation. The computation also accounts for thermal buoyancy force due to ultrasonic heating of the impingement surface, but over the time period considered in the current simulations, the flow is found to be dominated by the acoustic streaming force, with only moderate effect of buoyancy force.

Analysis hierarchical model for discrete event systems

The This paper presents the hierarchical model based on discrete event network for robotic systems. Based on the hierarchical approach, Petri network is analysed as a network of the highest conceptual level and the lowest level of local control. For modelling and control of complex robotic systems using extended Petri nets.Such a system is structured, controlled and analysed in this paper by using Visual Object Net ++ package that is relatively simple and easy to use, and the results are shown as representations easy to interpret. The hierarchical structure of the robotic system is implemented on computers analysed using specialized programs.Implementation of hierarchical model discrete event systems, as a real-time operating system on a computer network connected via a serial bus is possible, where each computer is dedicated to local and Petri model of a subsystem global robotic system. Since Petri models are simplified to apply general computers, analysis, modelling, complex manufacturing systems control can be achieved using Petri nets. Discrete event systems is a pragmatic tool for modelling industrial systems. For system modelling using Petri nets because we have our system where discrete event. To highlight the auxiliary time Petri model using transport stream divided into hierarchical levels and sections are analysed successively. Proposed robotic system simulation using timed Petri, offers the opportunity to view the robotic time. Application of goods or robotic and transmission times obtained by measuring spot is obtained graphics showing the average time for transport activity, using the parameters sets of finished products. individually.

The estimation of probability of the downtime of the vehicles under the changing conditions of the port industrial process

The estimation of the probability of downtime of the means of transport at varying conditions of port industrial process was suggested which affect the intensity and the time of processing vessel. The number of means of transport at the port terminal at a time and the number of efficient handling machines is referred under the productive process. The approach is based on the theory of queuing systems operating in a random environment. The case of direct interaction option of two transport streams were considered at one berth. To solve this problem the use of a special algorithm is provided, which is a combination of the probability of an asymptotic expansion in powers of a small parameter and matrix algorithm. The results allowed to formulate probabilistic indicators of port industrial process under varying conditions. The practical use of these parameters enables the management of a port terminal for more efficient process control and forecasting of possible economic losses caused by the decrease in the intensity of means of transport handling.

Using RFID and accelerometer-embedded tracers to measure probabilities of bed load transport, step lengths, and rest times in a mountain stream

We present new measurements of bed load tracer transport in a mountain stream over several snowmelt seasons. Cumulative displacements were measured using passive tracers, which consisted of gravel and cobbles embedded with radio frequency identification tags. The timing of bed load motion during 11 transporting events was quantified with active tracers, i.e., accelerometer-embedded cobbles. Probabilities of cobble transport increased with discharge above a threshold, and exhibited slight to moderate hysteresis during snowmelt hydrographs. Dividing cumulative displacements by the number of movements recorded by each active tracer constrained average step lengths. Average step lengths increased with discharge, and distributions of average step lengths and cumulative displacements were thin tailed. Distributions of rest times followed heavy-tailed power law scaling. Rest time scaling varied somewhat with discharge and with the degree to which tracers were incorporated into the streambed. The combination of thin-tailed displacement distributions and heavy-tailed rest time distributions predict superdiffusive dispersion.

Predictive analytics for truck arrival time estimation: a field study at a European distribution centre

Distribution centres (DCs) are the hubs connecting transport streams in the supply chain. The synchronisation of coming and going cargo at a DC requires reliable arrival times. To achieve this, a reliable method to predict arrival times is needed. A literature review was performed to find the factors that are reported to predict arrival time: congestion, weather, time of day and incidents. While travel time receives considerable attention, there is a gap in literature concerning arrival vs. travel/journey time prediction. None of the reviewed papers investigate arrival time: all the papers found investigate travel time. Arrival time is the consequence of travel time in combination with departure time, so though the travel time literature is applicable, the human factor involved in planning the time of departure can affect the arrival time (especially for truck drivers who have travelled the same route before). To validate the factors that influence arrival time, the authors conducted a detailed case study that includes a survey of 230 truckers, a data analysis and a data mining experiment, using real traffic and weather data. These show that although a ‘big data’ approach delivers valuable insights, the predictive power is not as high as expected; other factors, such as human or organisational factors, could influence arrival time, and it is concluded that such organisational factors should be considered in future predictive models.

Smells Like Home: The Role of Olfactory Cues in the Homing Behavior of Blacktip Sharks, Carcharhinus limbatus.

Animal navigation in the marine environment is believed to be guided by different sensory cues over different spatial scales. Geomagnetic cues are thought to guide long-range navigation, while visual or olfactory cues allow animals to pinpoint precise locations, but the complete behavioral sequence is not yet understood. Terra Ceia Bay is a primary nursery area for blacktip sharks, Carcharhinus limbatus, on southwestern Florida's Gulf of Mexico coast. Young-of-the-year animals show strong fidelity to a specific home range in the northeastern end of the bay and rapidly return when displaced. Older juveniles demonstrate annual philopatry for the first few years, migrating as far south as the Florida Keys each fall, then returning to Terra Ceia Bay each spring. To examine the sensory cues used in homing, we captured neonate (<3 weeks old) blacktip sharks from within their home range, fitted them with acoustic tags, and translocated them to sites 8 km away in adjacent Tampa Bay and released them. Intact animals returned to their home range, within 34 h on average, and remained there. With olfaction blocked, fewer animals returned to their home range and they took longer to do so, 130 h on average. However, they did not remain there but instead moved throughout Terra Ceia Bay and in and out of Tampa Bay. Since sharks from both treatments returned at night in tannic and turbid water, vision is likely not playing a major role in navigation by these animals. The animals in this study also returned on incoming or slack tides, suggesting that sharks, like many other fish, may use selective tidal stream transport to conserve energy and aid navigation during migration. Collectively, these results suggest that while other cues, possibly geomagnetic and/or tidal information, might guide sharks over long distances, olfactory cues are required for recognizing their specific home range.

Chemical characterization and in vitro antitumor activity of a single-component polysaccharide from Taxus chinensis var. mairei

An alkali-soluble single-component polysaccharide, named CPTC-2, was isolated and purified from the leaves of Taxus chinensis var. mairei. by ion-exchange and gel-permeation chromatography in series. The weight-average molecular mass (Mw) of CPTC-2 was about 73.53kDa determined by gel permeation chromatography (GPC). The structural characteristics of CPTC-2 were analyzed by gas chromatography (GC), Infrared (IR) spectrum, nuclear magnetic resonance (NMR) spectroscopy, periodate oxidation and Smith degradation studies, as well as methylation analysis. The results showed that CPTC-2 consisted of glucose, mannose, xylose, arabinose, rhamnose, and galactose with a molar ratio of 1.00:0.32:0.27:3.34:1.22:1.84. CPTC-2 was mainly composed of one type of sugar, α-glycosidic linkage. It had a backbone composed of α-(1→3) Araf, α-(1→5) Araf and α-(1→4) Galp with branches composed of α-(1→3,5) Araf and β-(1→3,6) Manp. In vitro anti-tumor experiments with SGC-7901 cells were performed and assessed by MTS (MPEG-2 Transport Stream) method and flow cytometry. The results showed CPTC-2 could inhibit the growth of SGC-7901 cells in a concentration-dependent manner via increased apoptosis. The relationship between the structure of CPTC-2 and its anti-tumor activity indicated that the α-configuration glycosidic bond residues may be essential for the anti-tumor activity of this polysaccharide.

A simple DEM assessment procedure for gully system analysis in the Lake Manyara area, northern Tanzania

Gully erosion is a major threat concerning landscape degradation in large areas along the northern Tanzanian Rift valley. It is the dominant erosion process producing large parts of the sediments that are effectively conducted into the river network. The study area is located in the Lake Manyara—Makuyuni River catchment, Arusha, northern Tanzania. During fieldwork, we measured topographic data of eight gully systems close to Makuyuni Town. The main focus of this study is to assess gully erosion dynamics using improved DEMs with original resolutions of 30 and 20 m, respectively. We assessed terrain characteristics to extract information on environmental drivers. To improve the DEM, we integrated information deduced from satellite images as well as from acquired GPS field data. Topographic indices such as Stream Power Index or Transport Capacity Index were derived from the re-interpolated DEM. To evaluate gully evolution, we assessed also the longitudinal slope profiles. Finally, the gully evolution phases of each gully were classified according to the concept proposed by Kosov et al. (Eksperimental’naya geomorfologiya, vol 3. Moscow University, Moskva, pp 113–140, 1978). The re-interpolated DEMs revealed a positive response especially for the more developed gullies. We show that the extraction of information on this spatial process scale based on “low-resolution” data is feasible with little additional fieldwork and image interpretation. In fact, areas identified as having a greater risk of gully erosion have been confirmed by observations and surveys carried out in the field.

Mapping spatial patterns of stream power and channel change along a gravel-bed river in northern Yellowstone

Stream power represents the rate of energy expenditure along a river and can be calculated using topographic data acquired via remote sensing or field surveys. This study sought to quantitatively relate temporal changes in the form of Soda Butte Creek, a gravel-bed river in northeastern Yellowstone National Park, to stream power gradients along an 8-km reach. Aerial photographs from 1994 to 2012 and ground-based surveys were used to develop a locational probability map and morphologic sediment budget to assess lateral channel mobility and changes in net sediment flux. A drainage area-to-discharge relationship and DEM developed from LiDAR data were used to obtain the discharge and slope values needed to calculate stream power. Local and lagged relationships between mean stream power gradient at median peak discharge and volumes of erosion, deposition, and net sediment flux were quantified via spatial cross-correlation analyses. Similarly, autocorrelations of locational probabilities and sediment fluxes were used to examine spatial patterns of sediment sources and sinks. Energy expended above critical stream power was calculated for each time period to relate the magnitude and duration of peak flows to the total volumetric change in each time increment. Collectively, we refer to these methods as the stream power gradient (SPG) framework. The results of this study were compromised by methodological limitations of the SPG framework and revealed some complications likely to arise when applying this framework to small, wandering, gravel-bed rivers. Correlations between stream power gradients and sediment flux were generally weak, highlighting the inability of relatively simple statistical approaches to link sub-budget cell-scale sediment dynamics to larger-scale driving forces such as stream power gradients. Improving the moderate spatial resolution techniques used in this study and acquiring very-high resolution data from recently developed methods in fluvial remote sensing could help improve understanding of the spatial organization of stream power, sediment transport, and channel change in dynamic natural rivers.

Transport Stream Playout System for MPEG-TS using Program Clock Reference

This paper presents the working and implementation of streaming rate control mechanism in real time video streaming over IP for Digital Video Broadcasting using PCR (Program Clock Reference). DVB (Digital Video Broadcasting) supports MPEG-TS mode of transmission such that videos are encoded in transport streams. Moving video images must be delivered in real time and with a consistent rate of presentation in order to preserve the illusion of motion. The PCR is a time reference that is sequentially transmitted with each program of a transport stream. PCR refers to the timing information for proper synchronization of audio and video which simultaneously control the rate of the packet transmitted. For sequential streaming of multiple MPEG-TS parameters in PAT (Program Association Table)are required to be same for all programs being streamed. PAT table is generated in transport stream packet with specific PID values.

Apical stem culturing to enhance cell sap assimilates towards grain sucrose and glutamine metabolism in wheat

Apical stem culturing offers an alternative approach of manipulating cell sap for wheat grain carbon and nitrogen metabolism in a near in vivo conditions. Employing this technique, role of sucrose and glutamine in transport stream on sucrose metabolism, ammonia assimilation and aminotransferase activities were assessed towards starch and protein accumulation in two wheat genotypes PBW 343 (low yield) and PBW 621 (high yield). At mid-milky stage, detached tillers were cultured in complete liquid medium containing varied concentration of glutamine and sucrose for seven days during year 2012–13 and 2013–14. Increasing glutamine concentration from 17 to 25 mM in the culture medium having 117 mM sucrose enhanced activities of nitrate reductase, glutamate synthase, glutamate oxaloacetate transaminase (GOT) and glutamate pyruvate transaminase (GPT) at 4 days after culturing (DAC) in correspondence with an increase in soluble protein content. However, at 7 DAC content of soluble protein decreased whereas starch accumulation increased showing, thereby a compensatory effect on carbon and nitrogen metabolism. Apparently, activities of sucrose synthase, soluble acid and neutral invertase significantly decreased. Increasing sucrose concentration from 117 to 125mMled to an increase in transformation of sugars to starch in grain but protein content decreased. PBW621 showed high protein content due to higher activities of GOT, GPT at 4 DAC which subsequently increased carbon skeleton of proteins towards starch synthesis at 7 DAC. Grain filling processes in terms of soluble sugars/starch were strongly correlated to invertase activities whereas proteins to aminotransferases.

TECHNOLOGIES OF HIGH-SPEED TRANSPORT FOR THE NORTH OF RUSSIA

The North of Russia in the short term remains not captured high-speed movement. Such situation can be rectified by application magnetic and levitation technologies, and so string trestle technologies. However, the careful ecological and economic reasoning, and also adaptation of constructive elements and technologies to North conditions has to precede use of such technologies. For development of the railway high-speed communication it is necessary to create rings of the high-speed movement. Thus the cellular network structure which is much more effective existing treelike, taking place in the Komi Republic, the Arkhangelsk and Murmansk areas will be initially formed. Container message of trestle type Ivdel - Indiga about 1100 km long can become possible application of magnetic and levitation technology in the north of Russia. From Ivdel the container highway can be continued in the southern direction to border with China. At the organization of the high-speed movement it is necessary to divide passenger and cargo transport streams. If to execute passenger modules in the form of individual vehicles (four-five-seater), elements of infrastructure will be less expensive. The sizes and loading capacity of containers for high-speed transportations can be also reduced. Developers of string transport systems actively study questions of design of transport modules of various mission, creation of low-cost transport infrastructure. In the conditions of the North of Russia development of transport system which would combine advantages of magnetic and levitation and string transport is of interest. Stability of such system can be provided when using effect of «a magnetic potential hole». Implementation of large transport projects of the high-speed movement in the Russian Federation can promote strengthening international cooperation and be carried out on its basis.

Transport Stream Analysis of a ISDB-T Signal Using an Embedded and Reconfigurable System

Quality management is an important criterion to evaluate broadcaster's transmission system integrity, which can be affected by radiofrequency signal impairments and by coding, multiplexing, and/or modulation errors. The international system integrated services digital broadcasting - terrestrial (ISDB-T) was designed to provide a reliable reception, even with interferences inherent to radio wave propagation. However, channel noise, as well as problems in the transmission system, may corrupt the transport stream (TS), causing image failures and, depending on the error level, even a complete loss of signal. This paper presents a supervisory system consisting of an ISDB-T front-end with spatial diversity of four branches, associated with a system-on-chip (SoC) board, in order to analyze the TS of any broadcaster, identifying transmission errors in real-time. The system continuously searches received data for impairments such as cyclic redundancy check - 32 and continuity counter errors, table/section intervals, and program clock reference jitter. The SoC comprises a field programmable gate array that includes a hard-wired processor, used to compute and show the analysis results.

Integrating food webs with metabolic networks: modeling contaminant degradation in marine ecosystems.

Integrating food webs with metabolic networks: modeling contaminant degradation in marine ecosystems.

About the influence of intercepting parking on traffic flows in Kharkiv

At that time the actual direction to reduce traffic load transport networks in the largest cities is organization of intercepting parking. This article presents an analysis of the research on the organization of intercepting parking in cities. The main steps of the developed technique of investigation of intercepting parking influence on the parameters of traffic flow in the city of Kharkov are given. This methodology is based on the modeling of transport streams using a mathematical model of transport network load. According to the simulation results, based on a variation of the flow of intercept to intercepting parking lots, the mathematical models of changes in the characteristics of traffic flows are developed. The dependence of the total running and the average time of movement on the transport network on the intensity of the use of intercepting parking are determined. These models allow making the quantitative estimates of the effect of intercepting parking on the characteristics of the traffic flow. The obtained results can be used to justify the feasibility of the organization and the necessary capacity of intercepting parking.

Multiple pathways regulate shoot branching.

Shoot branching patterns result from the spatio-temporal regulation of axillary bud outgrowth. Numerous endogenous, developmental and environmental factors are integrated at the bud and plant levels to determine numbers of growing shoots. Multiple pathways that converge to common integrators are most probably involved. We propose several pathways involving not only the classical hormones auxin, cytokinins and strigolactones, but also other signals with a strong influence on shoot branching such as gibberellins, sugars or molecular actors of plant phase transition. We also deal with recent findings about the molecular mechanisms and the pathway involved in the response to shade as an example of an environmental signal controlling branching. We propose the TEOSINTE BRANCHED1, CYCLOIDEA, PCF transcription factor TB1/BRC1 and the polar auxin transport stream in the stem as possible integrators of these pathways. We finally discuss how modeling can help to represent this highly dynamic system by articulating knowledges and hypothesis and calculating the phenotype properties they imply.

Sediment and nutrient dynamics during storm events in the Enxoé temporary river, southern Portugal

In temporary (or intermittent) rivers the first storm event after a dry period is responsible for transferring large amounts of sediment and nutrients into water reservoirs, thereby justifying close monitoring. The objective of this study was to analyse the contribution of storm events to sediment and nutrient transport in the Enxoé temporary river (southern Portugal) using detailed monitoring collected during three hydrological years (September, 2010 to August, 2013), and identify possible sediment and nutrient source areas based on the interpretation of hysteresis in the concentration–discharge relationship. The Enxoé River was monitored for suspended sediment concentration (SSC), total phosphorus (TP), particulate phosphorus (PP), soluble reactive phosphorus (SRP), and nitrate (NO3−). An empirical model was used to describe changes in solute concentrations, and the magnitude and rotational patterns of the hysteretic loops. Twenty-one storm events were registered. SSC, TP, PP, SRP, and NO3− concentrations varied between 1.6 and 3790.1, 0.05–11.4, 0–7.6, 0–0.67, and 0–27.84mgl−1, respectively. The highest SSC, TP, and PP concentrations were registered during the first storm event after an extended drought period. Annual sediment yields (13–480kgha−1y−1) and nitrate (4.4–45.5kgha−1y−1) were relatively low, while phosphorus losses (0.04–0.96kgha−1y−1) reached relatively high values during humid years. Sediment and phosphorus transport was influenced by the stream transport capacity and particle availability, whereas nitrate loads were influenced by rainfall, soil hydraulic characteristics, and land management. This work highlights the main processes involved in sediment and nutrients loads in a temporary river during storm events, with a quantification of the relevant elements.

Tissue distribution and urinary excretion of intravenously administered chemically functionalized graphene oxide sheets.

The design of graphene-based materials for biomedical purposes is of great interest. Graphene oxide (GO) sheets represent the most widespread type of graphene materials in biological investigations. In this work, thin GO sheets were synthesized and further chemically functionalized with DOTA (1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid), a stable radiometal chelating agent, by an epoxide opening reaction. We report the tissue distribution of the functionalized GO sheets labeled with radioactive indium (111In) after intravenous administration in mice. Whole body single photon emission computed tomography (SPECT/CT) imaging, gamma counting studies, Raman microscopy and histological investigations indicated extensive urinary excretion and predominantly spleen accumulation. Intact GO sheets were detected in the urine of injected mice by Raman spectroscopy, high resolution transmission electron microscopy (HR-TEM) and electron diffraction. These results offer a previously unavailable pharmacological understanding on how chemically functionalized GO sheets transport in the blood stream and interact with physiological barriers that will determine their body excretion and tissue accumulation.

GIS as a tool for efficient management of transport streams

GIS as a tool for efficient management of transport streams