Lehigh University

About: Lehigh University is a education organization based out in Bethlehem, Pennsylvania, United States. It is known for research contribution in the topics: Catalysis & Fracture mechanics. The organization has 12684 authors who have published 26550 publications receiving 770061 citations.

A giant planet undergoing extreme-ultraviolet irradiation by its hot massive-star host

Abstract: The amount of ultraviolet irradiation and ablation experienced by a planet depends strongly on the temperature of its host star. Of the thousands of extrasolar planets now known, only six have been found that transit hot, A-type stars (with temperatures of 7,300–10,000 kelvin), and no planets are known to transit the even hotter B-type stars. For example, WASP-33 is an A-type star with a temperature of about 7,430 kelvin, which hosts the hottest known transiting planet, WASP-33b (ref. 1); the planet is itself as hot as a red dwarf star of type M (ref. 2). WASP-33b displays a large heat differential between its dayside and nightside, and is highly inflated–traits that have been linked to high insolation. However, even at the temperature of its dayside, its atmosphere probably resembles the molecule-dominated atmospheres of other planets and, given the level of ultraviolet irradiation it experiences, its atmosphere is unlikely to be substantially ablated over the lifetime of its star. Here we report observations of the bright star HD 195689 (also known as KELT-9), which reveal a close-in (orbital period of about 1.48 days) transiting giant planet, KELT-9b. At approximately 10,170 kelvin, the host star is at the dividing line between stars of type A and B, and we measure the dayside temperature of KELT-9b to be about 4,600 kelvin. This is as hot as stars of stellar type K4 (ref. 5). The molecules in K stars are entirely dissociated, and so the primary sources of opacity in the dayside atmosphere of KELT-9b are probably atomic metals. Furthermore, KELT-9b receives 700 times more extreme-ultraviolet radiation (that is, with wavelengths shorter than 91.2 nanometres) than WASP-33b, leading to a predicted range of mass-loss rates that could leave the planet largely stripped of its envelope during the main-sequence lifetime of the host star.

The Perinatal Grief Scale: development and initial validation.

Abstract: The theoretical strategy underlying development of the Perinatal Grief Scale is described. The instrument was completed by 194 subjects as part of a longitudinal study of factors affecting the resolution of grief following spontaneous abortion, fetal or neonatal death, or ectopic pregnancy. Variables found to be significant predictors of grief, as measured by this scale, were: overall physical health of mother, gestational age at time of loss, quality of the marital relationship, and pre-loss mental health symptomatology.

Multi-sensor image fusion and its applications

Abstract: Preface AN OVERVIEW OF IMAGE FUSION Rick S. Blum, Zhiyun Xue, and Zhong Zhang MUTUAL INFORMATION BASED IMAGE REGISTRATION WITH APPLICATION TO 3D MEDICAL BRAIN IMAGERY Hua-Mei Chen and Pramod K. Varshney STUDIES IN REGISTRATION AND FUSION OF RETINAL IMAGES France Laliberte and Langis Gagnon NONRIGID MR/US REGISTRATION FOR TRACKING BRAIN DEFORMATIONS Xavier Pennec, Nicholas Ayache, Alexis Roche, and Pascal Cathier MULTISENSOR DATA INVERSION AND FUSION BASED ON SHARED IMAGE STRUCTURE Robert A. Weisenseel, William C. Karl, and Raymond C. Chan ENTROPIC GRAPHS FOR REGISTRATION Huzefa Neemuchwala and Alfred Hero FUSION OF IMAGES FROM DIFFERENT ELECTRO-OPTICAL SENSING MODALITIES FOR SURVEILLANCE AND NAVIGATION TASKS Alexander Toet A STATISTICAL SIGNAL PROCESSING APPROACH TO IMAGE FUSION USING HIDDEN MARKOV MODELS Jinzhong Yang and Rick S. Blum MULTIMODAL HUMAN RECOGNITION SYSTEMS Arun Ross and Anil K. Jain CHANGE DETECTION/INTERPRETATION WITH EVIDENTIAL FUSION OF CONTEXTUAL ATTRIBUTES: APPLICATIONS TO MULTIPASS RADARSAT-1 DATA Alexandre Jouan, Yannick Allard, and Yves Marcoz MULTISENSOR REGISTRATION FOR EARTH REMOTELY SENSED IMAGERY Jacqueline Le Moigne and Roger Eastman SYSTEM AND MODEL-BASED APPROACHES TO DATA FUSION FOR NDE APPLICATIONS Lalita Udpa, Satish Udpa, and Antonello Tamburrino FUSION OF MULTIMODAL NDI IMAGES FOR AIRCRAFT CORROSION DETECTION AND QUANTIFICATION Zheng Liu, David S. Forsyth, and Jerzy P. Komorowski FUSION OF BLURRED IMAGES Filip ?Sroubek and Jan Flusser GAZE-CONTINGENT MULTIMODALITY DISPLAYS FOR VISUAL INFORMATION FUSION: SYSTEMS AND APPLICATIONS Stavri Nikolov, Michael Jones, Iain Gilchrist, David Bull, and Nishan Canagarajah STRUCTURAL AND INFORMATION THEORETIC APPROACHES TO IMAGE QUALITY ASSESSMENT Kalpana Seshadrinathan, Hamid R. Sheikh, Alan C. Bovik, and Zhou Wang

Shape-adaptive discrete wavelet transforms for arbitrarily shaped visual object coding

Abstract: This paper presents a shape-adaptive wavelet coding technique for coding arbitrarily shaped still texture. This technique includes shape-adaptive discrete wavelet transforms (SA-DWTs) and extensions of zerotree entropy (ZTE) coding and embedded zerotree wavelet (EZW) coding. Shape-adaptive wavelet coding is needed for efficiently coding arbitrarily shaped visual objects, which is essential for object-oriented multimedia applications. The challenge is to achieve high coding efficiency while satisfying the functionality of representing arbitrarily shaped visual texture. One of the features of the SA-DWTs is that the number of coefficients after SA-DWTs is identical to the number of pixels in the original arbitrarily shaped visual object. Another feature of the SA-DWT is that the spatial correlation, locality properties of wavelet transforms, and self-similarity across subbands are well preserved in the SA-DWT. Also, for a rectangular region, the SA-DWT becomes identical to the conventional wavelet transforms. For the same reason, the extentions of ZTE and EZW to coding arbitrarily shaped visual objects carefully treat "don't care" nodes in the wavelet trees. Comparison of shape-adaptive wavelet coding with other coding schemes for arbitrarily shaped visual objects shows that shape-adaptive wavelet coding always achieves better coding efficiency than other schemes. One implementation of the shape-adaptive wavelet coding technique has been included in the new multimedia coding standard MPEG-4 for coding arbitrarily shaped still texture. Software implementation is also available.