Physical Sciences and Mathematics Commons^™

Modifications To Gravitational Wave Equation From Canonical Quantum Gravity, Andrea Dapor, Klaus Liegener

Faculty Publications

It is expected that the quantum nature of spacetime leaves its imprint in all semiclassical gravitational systems, at least in certain regimes, including gravitational waves. In this paper we investigate such imprints on gravitational waves within a specific framework: space is assumed to be discrete (in the form of a regular cubic lattice), and this discrete geometry is quantised following Dirac's canonical quantisation scheme. The semiclassical behavior is then extracted by promoting the expectation value of the Hamiltonian operator on a semiclassical state to an effective Hamiltonian. Considering a family of semiclassical states representing small tensor perturbations to Minkowski background, …

Zenithal Pedestrian Detection Using Multiple Feature Fusion In Monocular Vision, Chunhui Tang

Journal of System Simulation

Abstract: There were extensive literatures on pedestrian detection, mostly supposed that visible humans were observed in flat view. Sometimes pedestrian detection from another perspective should be considered. The pedestrian detection with a vertical view camera was taken into account, which was usually used to count the pedestrian number. A method is put forward for zenithal pedestrian detecting based on rectangular partition features, in which the pedestrian head detection takes place of the body detection. It is by the exhaustive scanning to find targets in an image and so all the candidates are put into a series of rectangular feature …

Research On Anchor Handling Simulation System, Zhongxian Zhu, Yin Yong, Helong Shen

Journal of System Simulation

Abstract: Anchor handling simulator (AHS) can provide a good visualization platform for the researchers and the anchor handling trainees, and has important significance on improving the working environment and efficiency. To build the anchor handling simulation platform, the mooring system's dynamics model was established based on Lumped Mass Method(LMM), and the offshore platform and anchor handling vessel's mathematical models were introduced based on the existing technologies in marine simulator. By utilizing the OpenSceneGraph(OSG) scene management engine and applying a series of visualization technologies, realized the simulation of the anchor handling operations, a real-time …

A Multicenter Mixed-Effects Model For Inference And Prediction Of 72-H Return Visits To The Emergency Department For Adult Patients With Trauma-Related Diagnoses, Ehsan Yaghmaei, Louis Ehwerhemuepha, William Feaster, David Gibbs, Cyril Rakovski

Mathematics, Physics, and Computer Science Faculty Articles and Research

Objective

Emergency department (ED) return visits within 72 h may be a sign of poor quality of care and entail unnecessary use of healthcare resources. In this study, we compare the performance of two leading statistical and machine learning classification algorithms, and we use the best performing approach to identify novel risk factors of ED return visits.

Methods

We analyzed 3.2 million ED encounters with at least one diagnosis under “injury, poisoning and certain other consequences of external causes” and “external causes of morbidity.” These encounters included patients 18 years or older from across 128 emergency room facilities in the …

Highly Swelling Ph-Responsive Microgels For Dual Mode Near Infra-Red Fluorescence Reporting And Imaging, Mingning Zhu, Dongdong Lu, Qing Lian, Shanglin Wu, Wenkai Wang, L. Andrew Lyon, Weiguang Wan, Paulo Bártolo, Mark Dickinson, Brian R. Saunders

Engineering Faculty Articles and Research

Near infra-red (NIR) fluorescence is a desirable property for probe particles because such deeply penetrating light enables remote reporting of the local environment in complex surroundings and imaging. Here, two NIR non-radiative energy transfer (NRET) fluorophores (Cy5 and Cy5.5) are coupled to preformed pH-responsive poly(ethylacrylate-methacrylic acid-divinylbenzene) microgel particles (PEA-MAA-5/5.5 MGs) to obtain new NIR fluorescent probes that are cytocompatible and swell strongly. NIR ratiometric photoluminescence (PL) intensity analysis enables reporting of pH-triggered PEA-MAA-5/5.5 MG particle swelling ratios over a very wide range (from 1–90). The dispersions have greatly improved colloidal stability compared to a reference temperature-responsive NIR MG based on …

Erratum: Basis Set Dependence Of Higher-Order Correlation Effects In Π -Type Interactions (J. Chem. Phys. (2012) 136 (014103) Doi: 10.1155/2019/4057848), Emily J. Carrell, Cara M. Thorne, Gregory S. Tschumper

Chemistry Faculty Research & Creative Works

For a sequence of three correlation consistent basis sets,1 an algebraic expression can be obtained from Feller's three-parameter exponential function for the complete basis set (CBS) limit of the Hartree–Fock (HF) energy.2 During the derivation of a general three-point algebraic expression for the HF CBS limit,3 it was recognized that Eq. (2) in our original paper4 had the wrong sign in the last term in the denominator. The correct equation is as follows: (Formula Presented). (Table Presented).

Evidence For A Supergalactic Structure Of Magnetic Deflection Multiplets Of Ultra-High-Energy Cosmic Rays, Rasha U. Abbasi

Physics: Faculty Publications and Other Works

Evidence for a large-scale supergalactic cosmic-ray multiplet (arrival directions correlated with energy) structure is reported for ultra-high-energy cosmic-ray (UHECR) energies above 1019 eV using 7 years of data from the Telescope Array (TA) surface detector and updated to 10 years. Previous energy–position correlation studies have made assumptions regarding magnetic field shapes and strength, and UHECR composition. Here the assumption tested is that, because the supergalactic plane is a fit to the average matter density of the local large-scale structure, UHECR sources and intervening extragalactic magnetic fields are correlated with this plane. This supergalactic deflection hypothesis is tested by the entire …

Multicourse Comparative Study Of The Core Aspects For Flipped Learning: Investigating In-Class Structure And Student Use Of Video Resources, Nicole Naibert, Emryse Geye, Michael M. Phillips, Jack Barbera

Chemistry Faculty Publications and Presentations

Since 2013, the number of publications on flipped learning within chemistry have steadily increased. However, most of these studies focus on flipped course reforms within individual institutions, while the outcomes of any learning environment are dependent on how the environment is structured and the degree to which students interact with its elements. In this study, we apply a coordinated set of assessment practices to investigate similarities among flipped chemistry courses at five institutions in the United States. All courses in the study followed the two basic tenets of flipped learning: (1) foundational information was delivered through preclass materials (PCMs), and …

Examining The Intersection Of Environmental Justice, Chronic Disease, And Pandemics; How A Mobile Health App Could Improve Health Outcomes And Inform Policy, Jessica Snow

Master's Projects and Capstones

The purpose of this paper is to analyze the intersection of environmental justice, chronic disease and illness, and pandemics. The inequitable distribution of polluting factories, landfills, and hazardous waste sites have been a long-standing concern in the field of environmental justice. Local zoning codes and land use policies have been tools for segregating people and concentrating pollution in low-income communities and communities of color. Many studies have found that pollution varies among racial and minority groups, and the burden of pollution is not one that is evenly shared. Communities of color and low income communities are disproportionately affected by air …

Fostering Climate Change Resilience: A Socio-Ecological Forest Systems Approach, Alyssa R. Soucy

Electronic Theses and Dissertations

As climate change continues to impact socio-ecological systems, those that rely on natural resources are highly sensitive to climatic changes. Maine’s forest industry provides for the economic and social well-being of many residents and is especially vulnerable to climate change impacts. Changes in growing season length and timing, forest health threats imposed by insects and pathogens, extreme weather events, shifting forest composition, and changes in natural disturbance severity and frequency have already begun, and are projected to continue, to impact forest systems in the Northeastern U.S. While climate change presents a threat to forest systems, opportunities also arise due to …

The Impact Of Different Grassland Land‐Uses On Earthworm Populations In A New Zealand Fragi‐Pallic Soil, Todd A. White, Trevor L. Knight, C. L. Goulter, W. J. Clarke-Hill

IGC Proceedings (1993-2023)

No abstract provided.

Patterns In Tropical Grass Silicification: Response To Substrate Fertilization, Valentin Kindomihou, Pierre Meerts, Brice Sinsin

IGC Proceedings (1993-2023)

No abstract provided.

Snackjack: A Toy Model Of Blackjack, Stewart N. Ethier, Jiyeon Lee

UNLV Gaming Research & Review Journal

Snackjack is a highly simplified version of blackjack that was proposed by Ethier (2010) and given its name by Epstein (2013). The eight-card deck comprises two aces, two deuces, and four treys, with aces having value either 1 or 4, and deuces and treys having values 2 and 3, respectively. The target total is 7 (vs. 21 in blackjack), and ace-trey is a natural. The dealer stands on 6 and 7, including soft totals, and otherwise hits. The player can stand, hit, double, or split, but split pairs receive only one card per paircard (like split aces in blackjack), and …

Galvanic Corrosion Of Carbon Steel-Stainless Steel Welds, Mi Li

Electronic Thesis and Dissertation Repository

A water leak in one of the Canada Deuterium Uranium (CANDU) nuclear reactors could lead to galvanic corrosion between the materials of its supporting structures: carbon steel (CS) and stainless steel (SS). This project investigates the effects of physical and chemical solution parameters on the corrosion of galvanically coupled dissimilar CS-SS welds, with the aim of developing a corrosion dynamics model that can be used to assess the long-term integrity of the CANDU reactor structural materials with confidence. The studied parameters were solution pH, temperature, the presence or absence of γ-radiation and the cathode:anode surface area ratio. Multiple electrochemical techniques …

Virtual Reality In Transportation: A Survey, Zhaohui Wu, Guo Yu, Wang Hui, Xiuna Miao

Journal of System Simulation

Abstract: The state-of-the-art of virtual reality application in the field of transportation was focused on. The novel virtual reality applications were summarized from the following six aspects: traffic simulation, accident simulation, virtual driving system, transportation achievements exhibition, behavior and psychology of traffic, virtual design and maintenance, and so on. The existing problems were discussed in the virtual reality application of transportation. The trends of virtual reality were proposed to try to solve the real traffic problems based on the transportation status of China.

Aesthetic Assessment For Digital Portrait Photos, Zeen Tao, Yuanyuan Pu, Xu Dan, Yiwei Liu

Journal of System Simulation

Abstract: Computational aesthetic evaluation is a challenging research. With the widespread use of digital products, it needs to improve the intelligence of digital products. How are these photos judged good or bad? The traditional photo aesthetic quality evaluation mainly is done based on subjective judgment or experts or the photographer's understanding for beauty. It is not only slow, but also with highly subjective. The results of face detect and eye detect were used to calculate visual balance of digital portrait based on face proportion and other features for aesthetic assessment of digital portrait photo were extracted too. The computer aesthetic …

Regional Credible Fusion Based Color-Texture Image Segmentation Approach, Yang Yong, Guo Ling, Wenzheng Dai, Yangdong Ye

Journal of System Simulation

Abstract: An approach is proposed based on the combined color information and texture information for color-texture image segmentation. The compacted multi-scale texture information is extracted by using singular value decomposition and principal component analysis dimension reduction under decomposing the multi-scale structure tensor, and then it is integrated with scale information and color information for improving the description ability to color-texture. To avoid the phenomenon such as over-segmentation and error segmentation appeared, the regional credible fusion degree is computed by combining four kinds of region information, such as region adjacency relationship, region size, common edge between regions, and J-divergence distance. Meanwhile, …

Multi-Agent Path Planning Maco Algorithm In Web3d Mountain Scene, Fengting Yan, Jinyuan Jia

Journal of System Simulation

Abstract: There is amount of data in a mountain scene, and the path planning algorithm in it is very complex, so it is not impossible to be shown detailed in Web. Usually the common potential path planning using contours can not find an optimal path because the path is easily cut under the cliff. To solve the above problems, a mACO (mountain ACO) path planning algorithm was addressed for the Web3D application, a planar grid ACO path planning algorithm and a A* path planning were completed in Web3D environment. Then a typical battle scene case was used for the …

Virtual Viewpoint Synthesis Based On Grid Mapping, Yao Li, Qiongying Wu, Xu Hui

Journal of System Simulation

Abstract: Due to imperfect depth maps, occlusion and the illumination difference between reference images, annoying artifacts, such as holes and ghost edges, appearing in the rendering image by DIBR, holes filling being time-consuming, triangle mesh based on the depth contour and maps mesh triangles with energy constrains were created. Image fusion algorithm merged different viewpoint images and got final virtual viewpoint image. While DIBR warped the image with pixels, triangles were mapped with. Compared with the traditional DIBR, the proposed algorithm has a faster processing speed than the traditional pixel based processing method in the same image quality.

Algorithm For Rgbd Point Cloud Denoising And Simplification Based On K-Means Clustering, Benyue Su, Jinyu Ma, Yusheng Peng, Sheng Min

Journal of System Simulation

Abstract: Aiming at the problem that the point cloud data scanned by Kinect or other depth camera have a huge number and more noise, a feature preserving method for point cloud denoising and simplification was proposed. This algorithm classified the point cloud rapidly by K-D tree; find The corresponding surface curvature values were obtained using curvature estimation algorithm; The K-means clustering algorithm for point cloud clustering was used. For each point in the cluster, the Euclidean distance was depended on between the point and center of the cluster and the change of the near points curvature to determine whether …

3d Skull Surface Completion Method Based On Multi-Exemplars, Reziwanguli Xiamixiding, Guohua Geng, Gulisong Nasierding, Qingqiong Deng, Dilinuer Keyimu, Zulipiya Maimaitiming, Wanrong Zhao, Zheng Lei

Journal of System Simulation

Abstract: In order to repair the damaged skulls, a skull completion method based on multiple exemplars was proposed. A 3D skull model database was constructed, and all the exemplars within the database were registered with a standard skull model. Each exemplar was then divided into a missing part and a remaining part according to the given damaged skull. After that, the relationship between the missing part and the remaining part was obtained by a regression algorithm. This relationship was used to calculate the missing part of the given skull, and a complete skull could be obtained by merging the two …

Mono-Slam Based Method For Stitching Images Of Sequence From Uav, Yuelong Ma, Zhao Yong, Xuefeng Cao

Journal of System Simulation

Abstract: It is an effective method to generate orthoimage from image sequence obtained from UAV. Most of the SfM-based methods for generating orthoimage are expensive computation and need hours or more to process image sequence, but the orthoimages generated finally are not satisfactory most of the time. An algorithm to stitch image sequence obtained from UAV incrementally was designed based on monocular SLAM generating orthoimage for large-scale instantaneously. Through the flow of SLAM, the system could estimate the position and attitude of the camera and the trajectory of UAV, meanwhile, generate a map of 3D point cloud. With the …

Study On Irregular Projection Surface Depth Perception Geometric Correction, Baoxing Bai, Yang Fan, Han Cheng, Zhang Chao

Journal of System Simulation

Abstract: In order to improve the universality of the projector projection scene, a method of depth perception geometric correction on the irregular projection surface was proposed. With the theoretical analysis of the coupling, the weaken coupling solution was proposed. The depth of the irregular projection surface could be acquired by the encoded color structured light. After that, the feedback was used to solve the maximum visual projection area, the dynamic slicing algorithm for the irregular surfaces depth information was used to pull away the stratification planes, so a corresponding homography matrix for each stratification plane was calculated and the homography …

Evaluation Method For Interior Layout Based On Voronoi Diagram, Milan Liu, Jiang Hao, Tianlu Mao, Zhaoqi Wang

Journal of System Simulation

Abstract: Three-dimensional interior model can be used to guide the indoor objects layout in real life. It is hard to evaluate an interior layout by a precise data because of the polymorphism and fuzzy of the evaluation problem of interior layout itself. In order to evaluate an interior layout objectively from the user’s view, an evaluation method for interior layout was proposed based on Voronoi Diagram. This method combined the knowledge of interior design and robot path planning, and generated moving lines in the scene by Voronoi Diagram. It could evaluate the interior layout objectively from aspects of patency, smoothness …

Multi-View Feature Learning Based On User Contributed Tag, Tian Feng, Fuhua Shang, Zhuoxuan Liu, Xukun Shen

Journal of System Simulation

Abstract: A multi-view feature learning method based on user contributed tag was proposed. Bag-of-words representation for content feature and textual feature was learned. A multi-view feature learning framework was proposed to explicitly model the relevance between multimedia object and tags by learning a linear mapping from textual representation to visual representation. The learned feature encoded the information conveyed by original feature, and inner products of leaned features were preserved with a high probability with visual features and textual features. The complexity of the method is linear with respect to the size of dataset. Furthermore, the method can be extended …

Spatial Cues Gradient In Time Domain Based Audio Attention Computational Model, Hang Bo, Wang Yi, Changqing Kang, Huang Jian

Journal of System Simulation

Abstract: In virtual reality audio, sound source whose directions change rapidly should have higher attention level. But present bottom-up audio attention computational models extract the underlying characteristics of single channel audio such as energy, pitch, zero crossing rate etc., which can not effectively express the audio attention caused by such signals. To solve this problem, based on the psychological principles that spatial information affects attention, a model was proposed to introduce the short-term spatial gradient cues to measure the attention caused by the single audio source space direction changing. Compared to the traditional audio attention computational model, the recall of …

360-Degree Virtual Fitting Based On Kinect, Xiaoli Zhang, Junfeng Yao, Huang Ping

Journal of System Simulation

Abstract: A lot of virtual fitting systems only study human-computer interaction and clothing simulation, but they can’t make clothes model to rotate 360 degree along with human. To solve this problem, an improved method of virtual fitting based on Kinect using motion prediction was proposed. With the help of Kinect, the skeleton feature points of user for real-time tracking were obtained. According to the obtained information of the joint point of the head and color image, face was detected and judging the front or back of the user. The motion trajectory of the left and right shoulders’ joint points based …

Visualization Of 2d Dynamic Vector Fields Based On Topology Analysis, Li Chao, Lingda Wu, Bin Zhao

Journal of System Simulation

Abstract: Flow is one of the most fundamental phenomenon in natural world. Flow visualization can give an intuitive view of flow fields and contribute to the observation and analysis of flow. Real flow fields are all dynamic while traditional visualization approaches are not able to reflect the trends of flows or the diversity inside them. Based on the research of Lagrangian Coherent Structures in Computational Fluid Dynamics, the concept of flow field topology was redefined, two typical 2D dynamic vector fields were selected for topology analysis, and the results were used to optimize the visual effects of geometric visualization. Experiments …

Graphics-Driver-Awared Heterogeneous Hardware-Accelerated Rendering Model, Zhiwei Ai, Cao Yi, Xiao Li, Huawei Wang

Journal of System Simulation

Abstract: As 3D graphics acceleration hardware technologies become more sophisticated, heterogeneous hardware-accelerated rendering model is one of effective means to improve interactive performance of large-scale data visualization. A graphics-driver-awared heterogeneous hardware-accelerated rendering model was proposed, and adaptive matching graphics architecture and graphics driver library in complex environment-improved the interactive performance of graphics rendering. Key technologies include runtime virtual layer technology, redundant graphics driver pool, running IntelliSense methods and graphics driver library dynamic loading technology. In practical application of visual analysis of nuclear reactor average flux, interactive performance of heterogeneous hardware rendering model available about 14 times speedup, has a …

Quadratic Rational Trigonometric Spline Curves With Shape Controlling, Xinru Liu, Manman Wei, Shengjun Liu, Dangfu Yang

Journal of System Simulation

Abstract: A new quadratic rational trigonometric spline curve with a shape parameter was proposed. The value control and the inflection-point control of the interpolation scheme were discussed in theory. And the optimal methods for calculating the desired inflection-points was proposed, by using optimization theory. Numerical experiments show the interpolation spline and the optimization method can be used in modeling design.