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Journal articles on the topic 'Geometric Transport'

Author: Grafiati

Published: 4 June 2021

Last updated: 14 February 2022

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1

BINI, DONATO, CHRISTIAN CHERUBINI, GIANLUCA CRUCIANI, and ROBERT T. JANTZEN. "GEOMETRIC TRANSPORT ALONG CIRCULAR ORBITS IN STATIONARY AXISYMMETRIC SPACETIMES." International Journal of Modern Physics D 13, no. 09 (October 2004): 1771–803. http://dx.doi.org/10.1142/s0218271804005237.

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Parallel transport along circular orbits in orthogonally transitive stationary axisymmetric spacetimes is described explicitly relative to Lie transport in terms of the electric and magnetic parts of the induced connection. The influence of both the gravito-electromagnetic fields associated with the zero angular momentum observers and of the Frenet–Serret parameters of these orbits as a function of their angular velocity is seen on the behavior of parallel transport through its representation as a parameter-dependent Lorentz transformation between these two inner-product preserving transports which is generated by the induced connection. This extends the analysis of parallel transport in the equatorial plane of the Kerr spacetime to the entire spacetime outside the black hole horizon, and helps give an intuitive picture of how competing "central attraction forces" and centripetal accelerations contribute with gravitomagnetic effects to explain the behavior of the 4-acceleration of circular orbits in that spacetime.

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2

Mehrafarin, Mohammad, and Reza Torabi. "Geometric aspects of phonon polarization transport." Physics Letters A 373, no. 25 (June 2009): 2114–16. http://dx.doi.org/10.1016/j.physleta.2009.04.041.

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3

Rau, Jochen. "Geometric magnetism in classical transport theory." Physical Review E 56, no. 2 (August 1, 1997): R1295—R1298. http://dx.doi.org/10.1103/physreve.56.r1295.

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4

Sil, Gourab, Avijit Maji, Suresh Nama, and Akhilesh Kumar Maurya. "OPERATING SPEED PREDICTION MODEL AS A TOOL FOR CONSISTENCY BASED GEOMETRIC DESIGN OF FOUR-LANE DIVIDED HIGHWAYS." Transport 34, no. 4 (July 17, 2019): 425–36. http://dx.doi.org/10.3846/transport.2019.10715.

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Researchers have studied two-lane rural highways to predict the operating speed on horizontal curves and correlated it with safety. However, the driving characteristics of four-lane-divided highways are different. Weak lane discipline is observed in these facilities, which influences vehicle speed in adjacent lane or space. So, irrespective of its lane or lateral position, vehicles in four-lane divided highways are considered free flowing only when it maintains the minimum threshold headway from any lead vehicle. Examination of two conditions is proposed to ensure the free flow. Vehicles meeting both conditions, when tracked from the preceding tangent section till the centre of the horizontal curve, are considered as free flowing. The speed data of such free flowing passenger cars at the centre of eighteen horizontal curves on four-lane divided highways is analysed to develop a linear operating speed prediction model. The developed model depends on curve radius and preceding tangent length. The operating speed of passenger car in four-lane divided highways is influenced by horizontal curve of radius 360 m or less. Further, longer tangent would yield higher operating speed at the centre of the curve. Finally, two nomograms are suggested for conventional design, consistency based design and geometric design consistency evaluation of four-lane divided horizontal curves.

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Abercrombie, Ronald F., and James E. Moore. "Ca Chelators and Membrane Transport: “Geometric” Considerations." Open Enzyme Inhibition Journal 1, no. 1 (April 7, 2008): 1–4. http://dx.doi.org/10.2174/1874940200801010001.

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6

Léger, Flavien. "A Geometric Perspective on Regularized Optimal Transport." Journal of Dynamics and Differential Equations 31, no. 4 (July 2, 2018): 1777–91. http://dx.doi.org/10.1007/s10884-018-9684-9.

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7

Dontsov, I. E. "Storage of Geometric Data." World of Transport and Transportation 17, no. 2 (September 13, 2019): 190–96. http://dx.doi.org/10.30932/1992-3252-2019-17-2-190-196.

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The implementation of railway digitalization programs is associated with development of information management systems and telecommunications, with enhancement of integrated automation of management and control systems.A new type of information system which is geographic information systems (GIS) is of interest as it is intended for decision-making in transport management and control systems. Besides, varioustraining simulators, that simulate movement of various objects and control procedures, have been widely implemented in civil aviation, on railways and in other modes of transport. The development of simulators is associated with development of visualization systems based on computer software.Respective operations are based on spatially distributed geometric information. The article depicts basic approaches to core methods of its storage and transmission via information networks.

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Rimkus, A. "OPTIMIZATION OF GEOMETRIC FORMS FOR URBAN TRANSPORT STOPS." Statyba 5, no. 2 (January 1999): 116–22. http://dx.doi.org/10.1080/13921525.1999.10531445.

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9

Li, Zuofeng, and Jeffrey F. Williamson. "Volume-based geometric modeling for radiation transport calculations." Medical Physics 19, no. 3 (May 1992): 667–77. http://dx.doi.org/10.1118/1.596810.

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10

Kirwin, William D., and Siye Wu. "Geometric Quantization, Parallel Transport and the Fourier Transform." Communications in Mathematical Physics 266, no. 3 (July 7, 2006): 577–94. http://dx.doi.org/10.1007/s00220-006-0043-z.

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11

CHAE, J., H. J. YANG, H. BAEK, J. HA, Y. KUK, S. Y. JUNG, Y. J. SONG, et al. "CHARGE PUDDLES AND EDGE EFFECT IN A GRAPHENE DEVICE AS STUDIED BY A SCANNING GATE MICROSCOPE." International Journal of High Speed Electronics and Systems 20, no. 01 (March 2011): 205–16. http://dx.doi.org/10.1142/s0129156411006532.

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Despite the recent progress in understanding the geometric structures of defects and edges in a graphene device (GD), how such defects and edges affect the transport properties of the device have not been clearly defined. In this study, the surface geometric structure of a GD was observed with an atomic force microscope (AFM) and the spatial variation of the transport current by the gating tip was measured with scanning gate microscopy (SGM). It was found that geometric corrugations, defects and edges directly influence the transport current. This observation is linked directly with a proposed scattering model based on macroscopic transport measurements.

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12

Mishchenko, Alexander, and Arshak Magalov. "ANALYSIS OF PARAMETERS OF ROAD TRACKING LIMITATIONS IN TERRITORIAL DESIGN." Current problems of architecture and urban planning, no. 58 (November 30, 2020): 283–90. http://dx.doi.org/10.32347/2077-3455.2020.58.283-290.

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Due to the need for mass construction of transport routes there is a need to develop theoretical foundations and methods of their design, which will simplify the design process, develop geometric models to optimize transport links, improve existing and create new methods of geometric modeling of optimal trajectories. terrain and road parameters. In the process of designing transport links, the main objective function is the economic effect of their construction. The cost-effectiveness of the overpass should include minimizing the length of the road, taking into account construction costs, which also depend on the minimum allowable parameters of transport routes, the peculiarities of traffic. To develop an optimization model for determining the trajectory of the road in the territorial design, the analysis of geometric parameters of the features of transport routes such as the minimum: turning radius in terms of Rgor; profile angle of rise of the path angle α; profile angle of descent path angle β, profile radius of path convex curves Rprof1; profile radius of the path concave curves Rprof2; step of supporting structures of engineering supports ∆L. And also the maximum height of transport engineering support ∆H. These indicators will serve as limitations in optimizing the trajectory of overpasses. А conditional classification of relief surfaces taking into account geometrical features and parameters of different types of overpasses is offered. Its use will promote increase of quality of designing of transport ways on a terrain relief, simplification of design process and improvement of quality of design planning decisions at territorial designing. The further use of the optimization model to determine the trajectory of roads for different types of transport will improve the quality of design, solving planning problems of spatial design.

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13

CHATTERJEE, SAIKAT, AMITABHA LAHIRI, and AMBAR N. SENGUPTA. "PARALLEL TRANSPORT OVER PATH SPACES." Reviews in Mathematical Physics 22, no. 09 (October 2010): 1033–59. http://dx.doi.org/10.1142/s0129055x10004156.

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We develop a differential geometric framework for parallel transport over path spaces and a corresponding discrete theory, an integrated version of the continuum theory, using a category-theoretic framework.

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Erlich, Alexander, Philip Pearce, Romina Plitman Mayo, Oliver E. Jensen, and Igor L. Chernyavsky. "Physical and geometric determinants of transport in fetoplacental microvascular networks." Science Advances 5, no. 4 (April 2019): eaav6326. http://dx.doi.org/10.1126/sciadv.aav6326.

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Across mammalian species, solute exchange takes place in complex microvascular networks. In the human placenta, the primary exchange units are terminal villi that contain disordered networks of fetal capillaries and are surrounded externally by maternal blood. We show how the irregular internal structure of a terminal villus determines its exchange capacity for diverse solutes. Distilling geometric features into three parameters, obtained from image analysis and computational fluid dynamics, we capture archetypal features of the structure-function relationship of terminal villi using a simple algebraic approximation, revealing transitions between flow- and diffusion-limited transport at vessel and network levels. Our theory accommodates countercurrent effects, incorporates nonlinear blood rheology, and offers an efficient method for testing network robustness. Our results show how physical estimates of solute transport, based on carefully defined geometrical statistics, provide a viable method for linking placental structure and function and offer a framework for assessing transport in other microvascular systems.

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15

LI, HUA-ZHONG. "WEYL'S GAUGE TRANSFORM AND QUANTUM GEOMETRIC PHASE FACTORS." Modern Physics Letters A 22, no. 07n10 (March 28, 2007): 645–50. http://dx.doi.org/10.1142/s0217732307023249.

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The historical and geometrical origin of Gauge Transformation and Yang's phase loop of gauge theory are discussed. In the present talk, we present the following points: 1. Parallel transport of a vector; 2. Weyl 1918 gauge transformation 3. Concept of non-integrable phase factor; 4. Berry's quantum geometrical phase; 5. Parallel transport of quantum state vector produces the phase physics.

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16

Letnik, Tomislav, Iztok Peruš, Stane Božičnik, and Matej Mencinger. "ON FUNDAMENTAL PRINCIPLES OF THE OPTIMAL NUMBER AND LOCATION OF LOADING BAYS IN URBAN AREAS." Transport 34, no. 6 (December 23, 2019): 722–40. http://dx.doi.org/10.3846/transport.2019.11779.

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The paper is dealing with the problem of finding the optimal number and location of Loading Bays (LBs) for efficient urban last mile deliveries. To solve the problem a multi-parametric model of the idealized urban area is introduced and applied to various instances of a rectangular urban grid structured zones. Multi-parametric approach is used to assess statistically the most relevant number and location of LBs. Computational and graphical results of the idealized model exhibit geometric patterns showing that the optimal Number of LBs (#LB) naturally tends to perfect squares. Moreover, even in case of generalized instances, at a selected number of LBs their distribution is not random but follows specific laws. The optimality is closely related to the prefixed (maximal) walking distance dmax, from the LB to the customer. Based on various simulations the existence and robustness of a descending convex dependence dmax = (#LB) is proven. The results might serve as a decision-making tool to determine the optimal number and location of LBs for any real-life city centre.

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17

Ptak, Mariusz. "PEDESTRIAN SAFETY: A NEW METHOD TO ASSESS PEDESTRIAN KINEMATICS." Transport 34, no. 1 (January 16, 2019): 41–51. http://dx.doi.org/10.3846/transport.2019.7081.

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The progress in pedestrian safety enhancement is the result of multi-stage work, which is based mainly on the vehicle enhancement and appropriate traffic organization. However, the full separation of vehicle traffic and pedestrians seem to be impossible nowadays. The paper presents a new method for assessing the influence of vehicle structural components on pedestrian kinematics. An integral part of the method is the relationship, named as the k parameter, which can determinate the geometric property of the pedestrian body movement (kinematics) after a collision. The development of the new algorithm is the answer to the problem of assessing the risk posed by the impact of the vehicle with a high bumper/bonnet reference line (e.g. a Sport Utility Vehicle – SUV) on a pedestrian. The presented method can be a useful engineering tool to assess the safety of vehicles, both brand-new and used. The developed test system binds together a new defined kinematic criterion as well as the existing biomechanical criteria (the assessment of vehicles using pedestrian impactors). The presented method was verified on a compact vehicle and a SUV.

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18

Li, Li, Dong Zhang, Xiao-Yun Cheng, Ping Wang, and Gui-Ping Wang. "A COMPOSITIONAL APPROACH FOR TRAFFIC DISTRIBUTION EVALUATION OF TRIPLE LEFT-TURN LANES FROM AN INDIVIDUAL PERSPECTIVE." Transport 36, no. 2 (May 4, 2021): 110–22. http://dx.doi.org/10.3846/transport.2021.14676.

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This study analysed unbalanced traffic distribution on Triple Left-Turn Lanes (TLTLs) at signalized intersections that is caused by left-turn drivers’ unequal lane preferences. To develop statistical bonding between the multilane traffic flow and individual lane choices, the lane volumes are formatted as compositional data to subject the sum-constant constraint. One-way and two-way Compositional ANalysis Of VAriance (CANOVA) models were formulated respectively to estimate the independent effect of one factor and its joint effects with other factors on the multilane traffic distribution. TLTL volume composition was the dependent variable of the models, while the factors of geometric design and traffic control that could affect left-turn drivers’ lane choice were the independent variables. Results indicate that variance of vehicle turning curve, length of the upstream segment, the location of triple left-turn sign, signal phase / cycle length, could affect the traffic distribution, and its balance could be achieved at specific levels of a factor. The joint effects of some factor couples could improve the unbalanced traffic distribution while others could not work.

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19

Fumeron, S. "A geometric approach for radiation transport inside complex systems." Physics Letters A 357, no. 2 (September 2006): 81–85. http://dx.doi.org/10.1016/j.physleta.2006.04.038.

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20

Moosmüller, Caroline, Felix Dietrich, and Ioannis G. Kevrekidis. "A Geometric Approach to the Transport of Discontinuous Densities." SIAM/ASA Journal on Uncertainty Quantification 8, no. 3 (January 2020): 1012–35. http://dx.doi.org/10.1137/19m1275760.

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21

Jakob, Wenzel, and Steve Marschner. "Geometric tools for exploring manifolds of light transport paths." Communications of the ACM 58, no. 11 (October 23, 2015): 103–11. http://dx.doi.org/10.1145/2823402.

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22

BASU, CHAITALI, and ABHIJIT MOOKERJEE. "EQUIVALENCE IN GEOMETRIC SCALING OF TRANSPORT PROPERTIES AND WAVEFUNCTIONS." International Journal of Modern Physics B 07, no. 05 (February 28, 1993): 1309–19. http://dx.doi.org/10.1142/s021797929300233x.

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The transport properties and wavefunction behave identically with respect to multifractal scaling. To establish the above statement, we carried out multifractal analysis on normalised transmittance and normalised wavefunction of two types of electron states, namely the resonance state and the localised state of a one-dimensional Anderson model.

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23

Santos, Fernando, Sébastien Fumeron, Bertrand Berche, and Fernando Moraes. "Geometric effects in the electronic transport of deformed nanotubes." Nanotechnology 27, no. 13 (February 22, 2016): 135302. http://dx.doi.org/10.1088/0957-4484/27/13/135302.

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24

Marisamynathan, Sankaran, and Perumal Vedagiri. "PEDESTRIAN SAFETY EVALUATION OF SIGNALIZED INTERSECTIONS USING SURROGATE SAFETY MEASURES." Transport 35, no. 1 (March 4, 2020): 48–56. http://dx.doi.org/10.3846/transport.2020.12157.

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The large proportions of pedestrian fatalities led researchers to make the improvements of pedestrian safety at intersections. Thus, this paper proposes a methodology to evaluate crosswalk safety at signalized intersections using Surrogate Safety Measures (SSM) under mixed traffic conditions. The required pedestrian, traffic, and geometric data were extracted based on the videographic survey conducted at signalized intersections in Mumbai (India). Post Encroachment Time (PET) for each pedestrian were segregated into three categories for estimating pedestrian–vehicle interactions and Cumulative Frequency Distribution (CDF) was plotted to calculate the threshold values for each interaction severity level. The Cumulative Logistic Regression (CLR) model was developed to predict the pedestrian mean PET values in the cross-walk at signalized intersections. The proposed model was validated with a new signalized intersection and the results were shown that the proposed PET ranges and model appropriate for Indian mixed traffic conditions. To assess the suitability of model framework, model transferability was carried out with data collected at signalized intersection in Kolkata (India). Finally, this study can be helpful to rank the severity level of pedestrian safety in the crosswalk and improve the existing facilities at signalized intersections.

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25

Coronell, Garis, Julián Arellana, and Víctor Cantillo. "LOCATION OF SPEED CONTROL CAMERAS ON HIGHWAYS: A GEOSPATIAL ANALYSIS." Transport 36, no. 3 (August 17, 2021): 199–212. http://dx.doi.org/10.3846/transport.2021.15117.

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This research proposes a methodology to identify critical sections of highways where the location of speeding control may be beneficial. The method relies on a spatial and statistical analysis of infrastructure risks, along with traffic accident frequency and severity. A relevant feature of this methodology is related to its potential to be used in areas where there are no detailed historical records about traffic crashes, which is common in Global South countries. We applied the methodology to a rural road network in Colombia, where a recent law established that technical criteria should support the location of speed cameras. The case study uses accident information from six years, and risk data from a road safety audit carried out in the area under study. Even though historical records of accidents in the area were not fully available, the methodology allowed prioritising speed camera installations in the zone and identifying the relevant variables to define camera location. The relevant variables were the geometric characteristics of the road, traffic flows, risk factors, and proximity to populated centres. The use of speed controls should be part of a road safety management system, which allows defining camera location according to robust technical criteria.

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26

Rimkus, Aleksas. "OPTIMIZATION OF GEOMETRIC FORMS FOR URBAN TRANSPORT STOPS/VISUOMENINIO TRANSPORTO STOTELIŲ RACIONALIŲ GEOMETRINIŲ FORMIŲ NUSTATYMAS." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 5, no. 2 (April 30, 1999): 116–22. http://dx.doi.org/10.3846/13921525.1999.10531445.

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In order to improve the functioning of urban transport it is necessary to increase the efficiency of intermediate stops and organization of municipal transport service. There are two ways of solving problems of developing urban transport: 1) to install special lanes in the streets for urban transport only and 2) to improve the geometric forms of the existing stops arranging stop “pockets”. The first way requires a lot of investments. The second is more preferable. It allows a safe and efficient use of vehicles, an increase in stop usage intensity. Therefore it may be considered the most important means for developing passenger transport. The experimental investigations have shown that stop pockets should be of 4 m width. Such pockets diminish considerably the number of conflict situations and troubles with transport vehicles driving along the first and second lanes and ensure for passengers the possibilities of getting comfortably and safely on a vehicle. An abrupt braking of a bus or trolley-bus before a stop or in its area affects in an unpleasant way the passengers, causes dangerous situations, transport vehicles are sometimes damaged and shear stresses result in street covering deformations. It was established that deceleration and acceleration lengths depend on a vehicle speed influenced by deceleration and acceleration value a = 1,2 m/s2. The length of deceleration and acceleration is from 30 to 116 m. It has been found by an analysis for tracks of public transport vehicles entering and leaving the stop pockets that they do not enter a stop pocket by a radius arc but by a varying curve. The shape of such a curve depends on drivers' professional skills, vehicle technical parameters and speed. In accordance with experiments and calculations, data and formulas were obtained for detailed coordinates of stop pockets. Geometric forms and parameters of stop pockets were established. Regarding the geometric shape of stop pockets, the entering speed of vehicles and their plans as initial parameters, the dimensional values of stop pocket elements were differentiated according to categories of streets and their disposition in relation to crossings (Table 4.2). The calculations have shown that investments into stop pocket development are profitable in many aspects: the entire area of a stop pocket is used, the traffic safety and duration of street coverings are increased, no traffic jams occur before the stop, the passenger servicing and municipal transport maintenance are improved. The expenses for installing a stop pocket in repaid in 0,49 of a year.

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27

Drijfhout, S. S. "What Sets the Surface Eddy Mass Flux in the Southern Ocean?" Journal of Physical Oceanography 35, no. 11 (November 1, 2005): 2152–66. http://dx.doi.org/10.1175/jpo2776.1.

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Abstract The Ocean Circulation and Climate Advanced Modelling (OCCAM) global, eddy-permitting ocean general circulation model has been used to investigate the surface eddy mass flux in the Southern Ocean. The isopycnal eddy mass flux in the surface layer is almost uniformly poleward and scales well with the local Ekman transport. This seems at odds with other models and observations suggesting topographic localization of the eddy fluxes with locally, large rotational components. Integrated over the thermocline depth the eddy fluxes do show such topographic localization. The surface eddy mass flux is mainly a consequence of the intermittent deepening of the mixed layer with the seasonal cycle, which redistributes the Ekman transport over the stack of layers that eventually become ventilated. Baroclinic instability gives rise to much smaller eddy-induced transports. Independent of the framework in which the residual mean flow is analyzed (isopycnal or geometric), the eddy-induced transport that opposes the wind-driven Ekman flow only partially compensates the Deacon cell. The associated overturning cell is about 5 Sv (where 1 Sv ≡ 106 m3 s−1), responsible for a cancellation of the Deacon cell of 30%. In geometric coordinates, a strong signature (14 Sv) of the Deacon cell remains for the residual mean flow. Only after transformation to density coordinates is a further reduction with 10 Sv obtained. Zonal tilting of isopycnals makes along-isopycnal recirculations appear as vertical overturning cells in geometric coordinates. These cells disappear in the isopycnal framework without any eddy-induced transport being involved.

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28

Маркин and Leonid Markin. "The Ways to Create Geometric Patterns Automated Layout." Geometry & Graphics 3, no. 1 (April 17, 2015): 64–69. http://dx.doi.org/10.12737/10460.

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Improving the quality of products associated with improving the quality of their design, which is achieved by using modern information technologies. Considering the high density layout of a modern transport technology, is an urgent development of mathematical software and automated layout system. The basis for the creation of mathematical development and software development need the steps to geometric modeling as placed objects, and the allocating process. The article discusses the layout automation products with a high density layout (especially means of transport). Since the problem of accommodation is a classical geometrical problem, then it is necessary to develop solutions appropriate geometric models. The article describes the main types of geometric models describing the shape of composable objects, their classification and application. We describe an automated layout problem as a problem of placement of a certain group of objects of specified sizes and shapes in a confined space. The paper shows that with an abundance of models used in modern applied geometry, allowing to describe the geometric shape of objects of any complexity, their use in computer-aided layout does not provide a solution to the problem of automated layout. The article shows the possibilities of modern software and reasons that do not allow its direct use in tasks of automated layout. The mathematical formulation of the problem as a layout optimization problem, indicating its objective function, constraints and performance criteria. An approach (unit normal equations), which allows the creation of geometric models of automated layout, move from exhaustive search of accommodation options composable objects to intelligent automated placement algorithms.

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Bullough, John D., and Xiang Liu. "ASSESSING THE VISIBILITY OF RAISED PAVEMENT MARKERS AND ALTERNATIVE FORMS OF DELINEATION." Transport 35, no. 1 (April 1, 2020): 98–107. http://dx.doi.org/10.3846/transport.2020.12072.

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Raised Pavement Markers (RPMs) are used by a number of transportation agencies with the objective of improving roadway safety, especially in complex roadway geometries and along wet roads. Because of maintenance and cost issues, many transportation agencies are exploring alternatives to RPMs such as wet reflective pavement tape and barrier-mounted reflective delineators. In order to assess the relative potential of these devices to contribute to nighttime driving safety, the luminances of new and used RPM samples from different manufacturers and having different colors and of several alternative delineation devices were measured in the laboratory using a range of geometric conditions relevant to the driving task. From these data, Luminances under representative low-beam headlight illumination were determined and these quantities were used to estimate driver visual performance. Large variations in luminance yielded relatively small differences in visual performance for a viewing distance of 100 m, primarily because of the plateau characteristic of visual performance. Differences in threshold visibility distances were greater, with distances at identification threshold for the devices measured ranging approximately from 150 to 400 m. Used RPMs had luminances 20…30% lower than new RPMs but similar visibility characteristics as new devices. The analysis method in this study may be useful for practitioners seeking to characterize the visual effectiveness of RPMs and other roadway delineation devices and systems.

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30

Xu, Xujun, Yanyan Zhao, Jicheng Wang, Ning Zhang, Chunlei Wang, Jicheng Zhang, and Ning Wei. "Water flow inside various geometric nano-confinement channels." Physical Chemistry Chemical Physics 22, no. 42 (2020): 24633–39. http://dx.doi.org/10.1039/d0cp04491a.

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31

Wu, Lei. "Diffusive limit with geometric correction of unsteady neutron transport equation." Kinetic & Related Models 10, no. 4 (2017): 1163–203. http://dx.doi.org/10.3934/krm.2017045.

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32

Wang, Shubo, Guancong Ma, and Che Ting Chan. "Topological transport of sound mediated by spin-redirection geometric phase." Science Advances 4, no. 2 (February 2018): eaaq1475. http://dx.doi.org/10.1126/sciadv.aaq1475.

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33

Exner, P., M. Tater, and D. Vaněk. "A single-mode quantum transport in serial-structure geometric scatterers." Journal of Mathematical Physics 42, no. 9 (September 2001): 4050–78. http://dx.doi.org/10.1063/1.1389287.

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34

Hsieh, Shang-Chieh, Fur-Der Mai, Soonmin Jang, Hong-Yi Tang, and Feng-Yin Li. "Geometric Effects on Conductance in Single Molecule Electron Transport Junctions." Journal of the Chinese Chemical Society 56, no. 6 (December 2009): 1198–204. http://dx.doi.org/10.1002/jccs.200900173.

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35

Shin, M., K. W. Park, S. Lee, and E. H. Lee. "Strong dependence of multichannel ballistic transport on the geometric symmetry." Superlattices and Microstructures 23, no. 1 (January 1998): 139–44. http://dx.doi.org/10.1006/spmi.1996.0325.

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36

Lu, Peng‐Xian, Man‐Man Lu, Chun Kong, Meng Zhang, and Zhi‐Wei Zhao. "Thermoelectric transport calculation of Si nanoclusters with different geometric shapes." Micro & Nano Letters 13, no. 1 (January 2018): 87–92. http://dx.doi.org/10.1049/mnl.2017.0446.

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37

Wagh, Apoorva G., and Veer Chand Rakhecha. "Gauge-independent formalism for parallel transport, geodesics and geometric phase." Journal of Physics A: Mathematical and General 32, no. 27 (January 1, 1999): 5167–78. http://dx.doi.org/10.1088/0305-4470/32/27/314.

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38

Kaur, Milanpreet, Ravinder Singh Sawhney, and Derick Engles. "Perusing Quantum Transport Through Geometric Gold Electrodes in Flexible Electronics." Quantum Matter 4, no. 2 (April 1, 2015): 182–89. http://dx.doi.org/10.1166/qm.2015.1191.

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39

Wu, Lei, and Yan Guo. "Geometric Correction for Diffusive Expansion of Steady Neutron Transport Equation." Communications in Mathematical Physics 336, no. 3 (February 25, 2015): 1473–553. http://dx.doi.org/10.1007/s00220-015-2315-y.

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Bubnelis, Vytautas Motiejus, Benas Slepakovas, Laura Černiauskaitė, and Henrikas Sivilevičius. "GELEŽINKELIO KELIO GEOMETRINIŲ PARAMETRŲ DINAMIKOS TYRIMAS TAIKANT KELIO KOKYBĖS INDEKSĄ / RAILWAYS GEOMETRICAL PARAMETERS DYNAMICS INVESTIGATION BY TRACK QUALITY INDEX." Mokslas - Lietuvos ateitis 10 (December 21, 2018): 1–7. http://dx.doi.org/10.3846/mla.2018.6165.

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Rail transport, in competition with other modes of transport, has to improve the quality of passenger and freight transport. In order to carry passengers and goods quickly, efficiently and safely, it is necessary take maintenance railways so that their geometric parameters do not exceed the tolerances. About real railway track condition, the data is obtained by track geometry recording car, measuring seven geometric parameters dispersion. This paper presents the methodology for determining and estimating the geometric parameters of the track geometry, which shows that the track quality index (TQI) is the sum of the variance of seven geometric parameters. Experimental research on the two-track A (8km) and B (11km) a three-year period (2015-2017) for all 12-month KKI, establish their quality dynamics (change over time). These data indicate that the quality of the analyzed sections A and B was good, but due to the increasing mass (in megatons) of transported loads, there is a tendency to deteriorate. Santrauka Geležinkelių transportas, konkuruodamas su kitomis transporto rūšimis, privalo gerinti keleivių ir krovinių vežimų kokybę. Norint greitai, efektyviai ir saugiai vežti keleivius ir krovinius, būtina taip prižiūrėti geležinkelių kelius, kad jų geometrinių parametrų nuokrypiai neviršytų leidžiamųjų nuokrypių. Apie tikrąją geležinkelių kelio būklę duomenys gaunami kelmačiu išmatavus septynių geometrinių parametrų sklaidą. Šiame darbe pateikta geležinkelio kelio geometrinių parametrų sklaidos nustatymo ir vertinimo metodika, kurioje įrodyta, kad kelio kokybės indeksas (KKI) yra septynių geometrinių parametrų dispersijų suma. Eksperimentiškai ištyrus dviejų geležinkelio kelių A (8 km) ir B (11 km) trijų metų laikotarpiu (nuo 2015 iki 2017 metų) visų 12 mėnesių KKI, nustatyta jų kokybės dinamika (kaita bėgant laikui). Šie duomenys rodo, kad ištyrinėtų A ir B ruožų kelio kokybė buvo gera, bet dėl didėjančios pervežtų krovinių suminės masės (megatonų skaičiaus) turi tendenciją blogėti.

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Petkevičius, Kazys, Lijana Maskeliūnaitė, and Henrikas Sivilevičius. "DETERMINING TRAVEL CONDITIONS ON MOTORWAYS FOR AUTOMOBILE TRASPORT BASED ON THE CASE STUDY FOR LITHUANIAN HIGHWAYS." Transport 34, no. 1 (February 5, 2019): 89–102. http://dx.doi.org/10.3846/transport.2019.7842.

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In Lithuania, the efforts are made to ensure the conditions of safe, comfortable and fast passenger and freight transportation on Lithuanian roads, satisfying geometric characteristics of their particular categories and the specified requirements to their pavement. The considered characteristics of pavement include its roughness, strength and the admissible rut depth and destruction level. Rest and Service Areas (RSAs) are usually set up at the roadside. The paper presents a description of the conditions specified for the movement of motor vehicles on the major Lithuanian roads in the seasons of warm weather and a Classification Model (CM) of the required conditions. It also provides the results of the evaluation of actual Travel Conditions (TCs) on the main Lithuanian roads by using the developed model. The obtained results show that in 2016 on the considered highways were good and very good, except for road A9, where the TCs were satisfactory. It is demonstrated that the distances between RSAs comply with the recommended distances. It is also shown that roughness of pavement and strength of the Structure of the Pavement (SP) depend on the destruction level of pavement. The values of such pavement parameters as roughness, rut depth and destruction level, which should not be exceeded because they help to ensure either comfortable or good TCs on Lithuanian highways, are given. The suggested model of road TCs can be used for determining the quality of TCs on highways.

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GROSSE, H., and E. LANGMANN. "THE GEOMETRIC PHASE AND THE SCHWINGER TERM IN SOME MODELS." International Journal of Modern Physics A 07, no. 21 (August 20, 1992): 5045–83. http://dx.doi.org/10.1142/s0217751x92002301.

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We discuss the quantization of fermions interacting with external fields and observe the occurrence of equivalent as well as inequivalent representations of the canonical anticommutation relations. Implementability of gauge and axial gauge transformations leads to generators which fulfil an algebra of current with a Schwinger term. This term can be written as a cocycle and leads to the boson-fermion correspondence. Transport of a quantum-mechanical system along a closed loop of parameter space may yield a geometric phase. We discuss models for which nonintegrable phase factors are obtained from the adiabatic parallel transport. After second quantization, one obtains, in addition, a Schwinger term. Depending on the type of transformation, a subtle relationship between these two obstructions can occur. We indicate finally how we may transport density matrices along closed loops in parameter space.

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Yan, Yuguang, Mingkui Tan, Yanwu Xu, Jiezhang Cao, Michael Ng, Huaqing Min, and Qingyao Wu. "Oversampling for Imbalanced Data via Optimal Transport." Proceedings of the AAAI Conference on Artificial Intelligence 33 (July 17, 2019): 5605–12. http://dx.doi.org/10.1609/aaai.v33i01.33015605.

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The issue of data imbalance occurs in many real-world applications especially in medical diagnosis, where normal cases are usually much more than the abnormal cases. To alleviate this issue, one of the most important approaches is the oversampling method, which seeks to synthesize minority class samples to balance the numbers of different classes. However, existing methods barely consider global geometric information involved in the distribution of minority class samples, and thus may incur distribution mismatching between real and synthetic samples. In this paper, relying on optimal transport (Villani 2008), we propose an oversampling method by exploiting global geometric information of data to make synthetic samples follow a similar distribution to that of minority class samples. Moreover, we introduce a novel regularization based on synthetic samples and shift the distribution of minority class samples according to loss information. Experiments on toy and real-world data sets demonstrate the efficacy of our proposed method in terms of multiple metrics.

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Di Palma, Paolo Roberto, Nicolas Guyennon, Andrea Parmigiani, Christian Huber, Falk Heβe, and Emanuele Romano. "Impact of Synthetic Porous Medium Geometric Properties on Solute Transport Using Direct 3D Pore-Scale Simulations." Geofluids 2019 (April 3, 2019): 1–13. http://dx.doi.org/10.1155/2019/6810467.

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Transport processes in porous media have been traditionally studied through the parameterization of macroscale properties, by means of volume-averaging or upscaling methods over a representative elementary volume. The possibility of upscaling results from pore-scale simulations, to obtain volume-averaging properties useful for practical purpose, can enhance the understanding of transport effects that manifest at larger scales. Several studies have been carried out to investigate the impact of the geometric properties of porous media on transport processes for solute species. However, the range of pore-scale geometric properties, which can be investigated, is usually limited to the number of samples acquired from microcomputed tomography images of real porous media. The present study takes advantage of synthetic porous medium generation to propose a systematic analysis of the relationships between geometric features of the porous media and transport processes through direct simulations of fluid flow and advection-diffusion of a non-reactive solute. Numerical simulations are performed with the lattice Boltzmann method on synthetic media generated with a geostatistically based approach. Our findings suggest that the advective transport is primarily affected by the specific surface area and the mean curvature of the porous medium, while the effective diffusion coefficient scales as the inverse of the tortuosity squared. Finally, the possibility of estimating the hydrodynamic dispersion coefficient knowing only the geometric properties of porous media and the applied pressure gradient has been tested, within the range of tested porous media, against advection-diffusion simulations at low Reynolds (<10-1) and Peclet numbers ranging from 101 to 10-2.

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Shiler, Alexander, Valeriy Shiler, and Ilkham Galiev. "Block design of a wheelset for railway transport." MATEC Web of Conferences 265 (2019): 02017. http://dx.doi.org/10.1051/matecconf/201926502017.

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The paper presents an analysis of the features of geometric contacting of the rolling surfaces of a block design of a wheelset and a rail. The peculiarities of the contact slipping by the rolling surfaces of the contact stresses are considered.

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Wang, Hua, and Changlong Gu. "VEHICLE TRAJECTORY BASED CONTROL DELAY ESTIMATION AT INTERSECTIONS USING LOW-FREQUENCY FLOATING CAR SAMPLING DATA." Transport 35, no. 5 (February 6, 2020): 523–32. http://dx.doi.org/10.3846/transport.2020.11962.

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Control delay is an important parameter that is used in the optimization of traffic signal timings and the estimation of the level of service at signalized intersection. However, it is also a parameter that is very difficult to estimate. In recent years, floating car data has emerged as an important data source for traffic state monitoring as a result of high accuracy, wide coverage and availability regardless of meteorological conditions, but has done little for control delay estimation. This article proposes a vehicle trajectory based control delay estimation method using low-frequency floating car data. Considering the sparseness and randomness of low-frequency floating car data, we use historical data to capture the deceleration and acceleration patterns. Combined with the low-frequency samples, the spatial and temporal ranges where a vehicle starts to decelerate and stop accelerating are calculated. These are used together with the control delay probability distribution function obtained based on the geometric probability model, to calculate the expected value of the control delay for each vehicle. The proposed method and a reference method are compared with the truth. The results show that the proposed method has a root mean square error of 11.8 s compared to 13.7 s for the reference method for the peak period. The corresponding values for the off-peak period are 9.3 s and 12.5 s. In addition to better accuracy, the mean and standard deviation statistics show that the proposed method outperforms the reference method and is therefore, more reliable. This successful estimation of control delay from sparse data paves the way for a more widespread use of floating car data for monitoring the state of intersections in road networks.

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Kazula, Stefan, Mark Wöllner, and Klaus Höschler. "Identification of efficient geometries for variable pitot inlets for supersonic transport." Aircraft Engineering and Aerospace Technology 92, no. 7 (June 1, 2020): 981–92. http://dx.doi.org/10.1108/aeat-11-2019-0228.

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Purpose This paper aims to reveal the influence of selected geometric parameters on the aerodynamic performance of circular variable aero engine inlets in transonic and supersonic civil aviation. Design/methodology/approach The trade-off in inlet design and aerodynamic evaluation parameters is presented. The approach to investigate the dependencies between the aerodynamic and geometric parameters at different flight conditions by means of a parametric design study is introduced. Findings The dependencies of inlet drag and efficiency from geometric parameters at flight speeds of Mach 0.95 up to Mach 1.6 are identified. Although entailing additional weight, the inlet length represents the parameter with the highest potential for drag reduction by up to 50% in the selected design space. Ideal geometries for variable pitot inlets are determined. After considering weight, their potential range benefit nearly disappears for subsonic applications, but remains above 20% for supersonic flight at Mach 1.6. Originality/value Hence, the technology of circular variable pitot inlets for supersonic transport aircraft could be a way to achieve the ambitious ecological, safety and economic goals for future civil aviation.

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Khesin, Boris, Gerard Misiołek, and Klas Modin. "Geometric hydrodynamics and infinite-dimensional Newton’s equations." Bulletin of the American Mathematical Society 58, no. 3 (June 2, 2021): 377–442. http://dx.doi.org/10.1090/bull/1728.

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We revisit the geodesic approach to ideal hydrodynamics and present a related geometric framework for Newton’s equations on groups of diffeomorphisms and spaces of probability densities. The latter setting is sufficiently general to include equations of compressible and incompressible fluid dynamics, magnetohydrodynamics, shallow water systems and equations of relativistic fluids. We illustrate this with a survey of selected examples, as well as with new results, using the tools of infinite-dimensional information geometry, optimal transport, the Madelung transform, and the formalism of symplectic and Poisson reduction.

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Andrews, David Q., Revital Cohen, Richard P. Van Duyne, and Mark A. Ratner. "Single molecule electron transport junctions: Charging and geometric effects on conductance." Journal of Chemical Physics 125, no. 17 (November 7, 2006): 174718. http://dx.doi.org/10.1063/1.2363182.

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Bachman, S. D., D. P. Marshall, J. R. Maddison, and J. Mak. "Evaluation of a scalar eddy transport coefficient based on geometric constraints." Ocean Modelling 109 (January 2017): 44–54. http://dx.doi.org/10.1016/j.ocemod.2016.12.004.

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