Access Spacing Based on Turning-Vehicle Acceleration

2017 ◽  
Vol 2618 (1) ◽  
pp. 1-7
Author(s):  
James L. Gattis ◽  
Justin R. Chimka ◽  
Andrew Evans
Keyword(s):  
Small Study ◽  
Access Management ◽  
Left Turn ◽  
The Core ◽  
Different Types ◽  
Vehicle Acceleration ◽  
Time Required ◽  
Vehicle Movement ◽  
Suburban Environment

Spacing between access connections—whether between a public roadway and a driveway or between two successive driveways—is one of the core techniques employed to effect access management. Several rationales reflecting different types of traffic interactions have been developed as a basis for minimum spacing distances. A small study was done in which two attributes were recorded: positions of vehicles turning from a side street and accelerating along the through roadway and time required for vehicles to turn left from the through roadway into a driveway. The vehicle movement described—a vehicle turning right from the side street into the through roadway—may be more likely to surprise the driver contemplating a left turn from the through roadway. Information derived from these observations, combined with perception–reaction values found in the literature, offers a basis for minimum spacing criteria that addresses one of many types of traffic interactions related to spacing, where a left turn is allowed across the through roadway downstream of another connection. These findings provide one more means to assess spacing along four-lane arterials in a developed suburban environment. A study with a greater scope to expand these findings is also proposed.

scholarly journals RESEARCH INTO AUTOMOBILE MOVEMENT ON A CURVE UNDER WINTER CONDITIONS / AUTOMOBILIO JUDĖJIMO POSŪKYJE TYRIMAS ŽIEMOS SĄLYGOMIS

2012 ◽  
Vol 3 (6) ◽  
pp. 25-28
Author(s):  
Kristina Kemzūraitė ◽  
Šarūnas Mikaliūnas ◽  
Edgar Sokolovskij ◽  
Giedrius Garbinčius
Keyword(s):  
Road Surface ◽  
Lateral Acceleration ◽  
Winter Conditions ◽  
Vehicle Acceleration ◽  
Vehicle Movement

The article analyzes the movement of the car on the curve on the slippery and snowy road surface with asphalted ruts. The paper reviews literature related to lateral and longitudinal vehicle acceleration and dynamics of vehicle movement. The experimental facts of vehicle lateral acceleration are given in graphical charts. The article also describes the acceleration values and stability of the automobile depending on the speed in the curve. The findings are given based on the results. Santrauka Straipsnyje nagrinėjamas automobilio judėjimas posūkyje esant slidžiai ir snieguotai su asfaltuotomis provėžomis kelio dangai. Apžvelgiama literatūra, susijusi su automobilių skersiniais ir išilginiais pagreičiais, automobilių judėjimo dinamika. Eksperimentinėje dalyje pateikiami automobilių skersinių pagreičių grafikai. Nagrinėjamas pagreičių dydis ir automobilio stabilumas priklausomai nuo judėjimo greičio tame kelio posūkyje. Remiantis gautais rezultatais pateikiamos išvados.

scholarly journals Design and Fabrication of Automatic Sorting Machine using Arduino

2020 ◽  
pp. 85-90
Author(s):  
Kadole Pavan Prabhakar ◽  
Choudhury Rajat Kumar Pattnaik ◽  
Akash Kumar Nath ◽  
Aditya Dubey ◽  
KM Vishall Somaiya
Keyword(s):  
Embedded System ◽  
Human Error ◽  
Conveyor Belt ◽  
Conveyor System ◽  
Automatic Sorting ◽  
Manual Sorting ◽  
Ir Sensors ◽  
Different Types ◽  
Transport Line ◽  
Time Required

This work is based on Design of a transport line conveyor belt for sorting and arranging products based on their height using the IR sensors for detecting the object and mechanism to drive the conveyor belt. The project is locally controlled by the use of Arduino based embedded system. The automatic sorting and arranging machine are used to sort the different types of products based on the product height. This automation significantly reduces the time required for manual sorting in the production line of small/medium scale industries and hence it also decreases the percentage of human error during sorting/arranging. The products are placed on the transport line conveyor system and as it moves on the conveyor it is scanned by the IR sensor, depending on the height of the product these will be sorted into different bins automatically.

Agents of peace: place, identity and peacebuilding

2018 ◽  
Author(s):  
Gëzim Visoka
Keyword(s):  
Place Identity ◽  
Critical Hermeneutics ◽  
The Core ◽  
Post Conflict ◽  
Everyday Practices ◽  
Sustainable Peace ◽  
Different Types ◽  
Nuanced Understanding ◽  
And Performance ◽  
Modes Of Governance

This chapter provides a new account of identity and practices of agents in the context of post-conflict peacebuilding. It investigates how place, habitus, and fields of interaction alongside the performative roles shape the identity of agents and their socialization in practice. To explore the relation between the agents’ presence and their impact on peacebuilding, this paper bypasses the exclusionary dichotomies between local/international and liberal/indigenous agents, and develops a typology of six types of agents horizontally arranged around their insideness and outsideness towards a particular conflict-affected place. Using human geography and critical hermeneutics, this paper categorises ‘agents of peace’ in six different types: existential insiders, subjective insiders, empathetic insiders, behavioural insiders, objective outsiders, and existential outsiders. The core argument of this article is that the differentiation of agents around the geographical and performance towards a particular place facilitates the exploration of pluralist forms of agency and a more nuanced understanding of dynamics in post-conflict societies. An expanded and plural view of agents captures better the fields of interaction and hybridization, agential knowledge and narratives, modes of governance, and various everyday practices that enable or inhibit sustainable peace.

Security and Privacy Concerns of Virtual Worlds

2011 ◽  
pp. 244-256
Author(s):  
Greg Gogolin
Keyword(s):  
Risk Management ◽  
Resource Management ◽  
Virtual Worlds ◽  
Security And Privacy ◽  
Access Management ◽  
Security Risks ◽  
Privacy Concerns ◽  
The Core ◽  
Product Risk ◽  
Virtual Meetings

This chapter looks at security and privacy concerns of virtual worlds by investigating the use and capabilities of current and emerging technologies such as gaming, blogging, podcasting, virtual meetings, and virtual worlds. Security and privacy concerns will be investigated in the context of exploits and IT-related security risks, access management and confidentiality, reputation and product risk management, resource management, financial considerations and accountability, and safety. Several technologies and personal practices are reviewed, as well as ways to mitigate or eliminate their associated risks. The core principles of information security -confidentiality, integrity, and availability - provide an overall framework for the chapter.

scholarly journals EFFECTS OF ADMIXTURES ON THE CRYSTALLISATION RATE OF GYPSUM A BATCH CRYSTALLISATION STUDY

REAKTOR ◽  
2017 ◽  
Vol 8 (2) ◽  
pp. 85
Author(s):  
S. Muryanto ◽  
H. M. Ang
Keyword(s):  
Equilibrium Concentration ◽  
Crystallization Rate ◽  
Supersaturated Solution ◽  
Different Types ◽  
Different Temperatures ◽  
Copper Zinc ◽  
Time Required ◽  
Crystallisation Rate ◽  
Zinc Concentrate ◽  
Concentrate Production

This paper descripbes a study on the effects of admixtures on the crystallization rate of gypsum. Two different types of biodegradable admixtures commonly used as flotation agent in copper/zinc concentrate production, namely, sodium isopropyl xanthate (=SIPX) and isopropyl thionocarbamate were investigated in this study. A laboratory batch crystallizer was used in this study, and the experiments were run using seeded method. The rate of desupersaturation or the time required to reach the equilibrium concentration was  compared for varying admixture oncentrations. It was discovered that the added seed crystals started growing imediately upon addition into the supersaturated solution, i.e. there  was no induction time.Results of this batch crystallizationstudy suggest that addition of admixtures individually or in combination, significantly affects the crystallization kinetics and in particular, reduces the rate of crystallization of gypsum. Activation energies were determined using three different temperatures, and the values obtained  mostly agreed with other published values, i.e. 60.00 ± 3.00, 57.39 ± 2.87, and 37.65 ±1.88 kj/mol, for pure gypsum, isopropyl yhionocarbamate, and SIPX, respectively.Keywords : activation energy; admixtures; CaSO4.2H2O; crystallization, gypsum; reaction rate

Main Steam Line Break Calculations Using a Coupled RELAP5/PARCS Model for the Ringhals-3 Pressurized Water Reactor

2008 ◽  
Author(s):  
Mathias Sta˚lek ◽  
Jo´zsef Ba´na´ti ◽  
Christophe Demazie`re
Keyword(s):  
Steady State ◽  
Fuel Assembly ◽  
Thermal Power ◽  
Steam Line ◽  
Pressurized Water ◽  
The Core ◽  
Different Types ◽  
Main Steam Line ◽  
Main Steam ◽  
Control Rods

A Main Steam Line Break (MSLB) is an important transient for Pressurized Water Reactors (PWR) due to the strong positive reactivity introduced by the over-cooling of the core. Since this effect is stronger when the Moderator Temperature Coefficient (MTC) has a large amplitude, a conservative result will be obtained for a high burnup of the fuel due to the more negative MTC late in the cycle. The calculations have been performed at a cycle burnup of 12.9742 GWd/tHM. The Swedish Ringhals-3 PWR is a three loop Westinghouse design, currently with a thermal power of 3000 MW. The PARCS model has 157 fuel assemblies of 8 different types. Four different types of reflector are used. The cross sections, and kinetic data were obtained from CASMO-4 calculations, using a cross section interface developed at the department. There are 24 axial nodes, and 2×2 radial nodes for each assembly. The transient option for calculating the effect of poisoning was used. The PARCS model has been validated against steady-state measurements from Ringhals-3 of the Relative Power Fraction (RPF) and of the core criticality. The RELAP5 model has 157 channels for the core which means that there is a one to one correspondence between the thermal hydraulics model and the neutronics model. There is eight axial nodes. Originally, the intention was to have 24 axial nodes but this proved not to work because of some limitation in RELAP5. There is currently no mixing between the different channels in the core. The feedwater, and turbines are modelled as boundary conditions. The stand-alone RELAP5 model has been validated against steady state measurements from Ringhals-3. A number of different cases were considered. In the first case, both the isolation of the feedwater for the broken loop, and all the control rods were assumed to work properly. For the second case one of the control rods was assumed to be stuck. The stuck rod was located in the fuel assembly with the highest power. This rod has also one of the highest rod worths. In the final case, the feedwater control valve for the broken loop was fully open. None of the cases led to any recriticality. The increase in power for each fuel assembly was also investigated. With the control rod located in the assembly with the highest power, the maximum power increase before scram turned out to be about 25% compared to the initial power.

The estimation algorithm of operative capabilities of complex countermeasures to resist UAVs

SIMULATION ◽  
2018 ◽  
Vol 95 (6) ◽  
pp. 569-573
Author(s):  
Igor Korobiichuk ◽  
Yuriy Danik ◽  
Oleksyj Samchyshyn ◽  
Sergiy Dupelich ◽  
Maciej Kachniarz
Keyword(s):  
Unmanned Aerial Vehicle ◽  
Estimation Algorithm ◽  
Probability Of Detection ◽  
Software Implementation ◽  
Observation Model ◽  
Different Types ◽  
Aerial Vehicle ◽  
Use Efficiency ◽  
Time Required

The proposed observation model provides for calculating the probability of detection of different types of unmanned aerial vehicle (UAV) at a certain range with regard to their tactical and technical characteristics and security equipment capabilities. The comparison of the obtained values of generalized indicators of security equipment use efficiency is based on a specified criterion. To take into account factors that significantly affect a modeling object, calculations are carried out under specified conditions and restrictions. UAVs should be detected until a covering object gets in a swath width given the time required for countermeasures. Based on the software implementation of the algorithm we have evaluated the efficiency of use of hypothetical security equipment for detecting certain types of UAVs, and defined means of further use or improvement.

scholarly journals Indium Phosphide-Based Semiconductor Nanocrystals and Their Applications

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
Paul Mushonga ◽  
Martin O. Onani ◽  
Abram M. Madiehe ◽  
Mervin Meyer
Keyword(s):  
Indium Phosphide ◽  
Surface Passivation ◽  
Semiconductor Nanocrystals ◽  
Core Size ◽  
The Core ◽  
Colloidal Semiconductor Nanocrystals ◽  
Biological Studies ◽  
Fluorescent Materials ◽  
Different Types ◽  
Heating Up

Semiconductor nanocrystals or quantum dots (QDs) are nanometer-sized fluorescent materials with optical properties that can be fine-tuned by varying the core size or growing a shell around the core. They have recently found wide use in the biological field which has further enhanced their importance. This review focuses on the synthesis of indium phosphide (InP) colloidal semiconductor nanocrystals. The two synthetic techniques, namely, the hot-injection and heating-up methods are discussed. Different types of the InP-based QDs involving their use as core, core/shell, alloyed, and doped systems are reviewed. The use of inorganic shells for surface passivation is also highlighted. The paper is concluded by some highlights of the applications of these systems in biological studies.

Eddy Current Array Inspection of Damaged CFRP Sandwich Panels

2020 ◽  
Vol 3 (3) ◽  
Author(s):  
P. R. Underhill ◽  
T. Rellinger ◽  
T. W. Krause ◽  
D. Wowk
Keyword(s):  
Carbon Fiber ◽  
Eddy Current ◽  
Sandwich Panels ◽  
Fiber Reinforced Polymer ◽  
Face Sheet ◽  
Carbon Fiber Reinforced Polymer ◽  
The Core ◽  
Reinforced Polymer ◽  
Different Types ◽  
Phase Map

Abstract The use of eddy current (EC) arrays to detect damage in sandwich panels, such as disbonding of the carbon fiber reinforced polymer (CFRP) face-sheet to the core, is investigated. It is shown that the array is very sensitive to slight core crush and can readily find small dents and disbonds. At the same time, the eddy current array can look much deeper into the honeycomb to detect defects such as tears. The phase map of the EC signal can be used in some cases to distinguish between different types of damage. EC arrays offer the ability to rapidly scan large areas of CFRP panels.

Planet Formation

2018 ◽  
Author(s):  
Morris Podolak
Keyword(s):  
Planet Formation ◽  
Giant Planet ◽  
Terrestrial Planet ◽  
Interstellar Space ◽  
Normal Density ◽  
Main Question ◽  
Primitive Form ◽  
The Core ◽  
Gas Giant ◽  
Time Required

Modern observational techniques are still not powerful enough to directly view planet formation, and so it is necessary to rely on theory. However, observations do give two important clues to the formation process. The first is that the most primitive form of material in interstellar space exists as a dilute gas. Some of this gas is unstable against gravitational collapse, and begins to contract. Because the angular momentum of the gas is not zero, it contracts along the spin axis, but remains extended in the plane perpendicular to that axis, so that a disk is formed. Viscous processes in the disk carry most of the mass into the center where a star eventually forms. In the process, almost as a by-product, a planetary system is formed as well. The second clue is the time required. Young stars are indeed observed to have gas disks, composed mostly of hydrogen and helium, surrounding them, and observations tell us that these disks dissipate after about 5 to 10 million years. If planets like Jupiter and Saturn, which are very rich in hydrogen and helium, are to form in such a disk, they must accrete their gas within 5 million years of the time of the formation of the disk. Any formation scenario one proposes must produce Jupiter in that time, although the terrestrial planets, which don’t contain significant amounts of hydrogen and helium, could have taken longer to build. Modern estimates for the formation time of the Earth are of the order of 100 million years. To date there are two main candidate theories for producing Jupiter-like planets. The core accretion (CA) scenario supposes that any solid materials in the disk slowly coagulate into protoplanetary cores with progressively larger masses. If the core remains small enough it won’t have a strong enough gravitational force to attract gas from the surrounding disk, and the result will be a terrestrial planet. If the core grows large enough (of the order of ten Earth masses), and the disk has not yet dissipated, then the planetary embryo can attract gas from the surrounding disk and grow to be a gas giant. If the disk dissipates before the process is complete, the result will be an object like Uranus or Neptune, which has a small, but significant, complement of hydrogen and helium. The main question is whether the protoplanetary core can grow large enough before the disk dissipates. A second scenario is the disk instability (DI) scenario. This scenario posits that the disk itself is unstable and tends to develop regions of higher than normal density. Such regions collapse under their own gravity to form Jupiter-mass protoplanets. In the DI scenario a Jupiter-mass clump of gas can form—in several hundred years which will eventually contract into a gas giant planet. The difficulty here is to bring the disk to a condition where such instabilities will form. Now that we have discovered nearly 3000 planetary systems, there will be numerous examples against which to test these scenarios.

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