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Fourier Concentration from Shrinkage

Russell Impagliazzo, Valentine Kabanets
2016 Computational Complexity  
We prove that this Fourier concentration is essentially optimal.  ...  For Boolean functions computed by de Morgan formulas of subquadratic size or read-once de Morgan formulas, we prove a sharp concentration of the Fourier mass on "small-degree" coefficients.  ...  The learning and compression results follow immediately from Fourier concentration, using standard methods (cf. [36] ).  ... 
doi:10.1007/s00037-016-0134-y fatcat:czv5akwlnnaubcnhalr2s6nxqq

Fourier Concentration from Shrinkage

Russell Impagliazzo, Valentine Kabanets
2014 2014 IEEE 29th Conference on Computational Complexity (CCC)  
We prove that this Fourier concentration is essentially optimal.  ...  For Boolean functions computed by de Morgan formulas of subquadratic size or read-once de Morgan formulas, we prove a sharp concentration of the Fourier mass on "small-degree" coefficients.  ...  The learning and compression results follow immediately from Fourier concentration, using standard methods (cf. [36] ).  ... 
doi:10.1109/ccc.2014.39 dblp:conf/coco/ImpagliazzoK14 fatcat:xrlhsaa2x5b2nbn6udykgvzn2a

ForWaRD: Fourier-Wavelet Regularized Deconvolution for Ill-Conditioned Systems

R. Neelamani, H. Choi, R. Baraniuk
2004 IEEE Transactions on Signal Processing  
engineering in 1999 and 2003, respectively, from Rice University, Houston, TX.  ...  Ramesh Neelamani (S'00-M'03) received the B.Tech. degree in electrical engineering in 1997 from the Indian Institute of Technology, Bombay, India, and the M.S. and Ph.D. degrees in electrical and computer  ...  The signal energy is concentrated in fewer wavelet components than Fourier components.  ... 
doi:10.1109/tsp.2003.821103 fatcat:qex4a7q4rbcm7hgombtddnrtwe

Manufacturing of Opals from Polymethylmethacrylate Particles in Dispersion Media with Different Viscosities

Ivan V. Nemtsev, Olga V. Shabanova
2021 Journal of Siberian Federal University Mathematics & Physics  
The purpose of this study is to obtain three-dimensional photonic crystals by self-assembly from submicron spherical monodisperse particles of polymethylmethacrylate in dispersion media with different  ...  From longer polymer chains, nanoglobules are formed that capture a larger amount of the dispersion medium (with an increased concentration of monomer).  ...  The volume concentrations of acetone and DMSO were taken at random.  ... 
doi:10.17516/1997-1397-2021-14-2-178-185 fatcat:2h7ue7nkdrghxik2xjxmhukfkq

Effect of heat wave at the initial stage in spark plasma sintering

Long Zhang, Xiaomin Zhang, Zhongxiang Chu, Song Peng, Zimin Yan, Yuan Liang
2016 SpringerPlus  
It cannot access from the classical Fourier heat conduction law since it implies that thermal diffusion velocity is infinite (the classical Fourier heat conduction law may apply to the conventional pressure-less  ...  ., temperature, pressure, etc.) often differ from the test environment, but for the transient behavior at the initial sintering stage instead of the whole densification process, non-Fourier heat conduction  ... 
doi:10.1186/s40064-016-2344-9 pmid:27386287 pmcid:PMC4917513 fatcat:bm35yzrtzjam7fvzdnjxwmj5ma

Influence of the Activator Concentration and Solid/Liquid Ratio on the Strength and Shrinkage Characteristics of Alkali-Activated Slag Geopolymer Pastes

Zikai Xu, Jinchao Yue, Guanhong Pang, Ruixia Li, Peng Zhang, Shengtang Xu, Jiaolong Ren
2021 Advances in Civil Engineering  
These findings are expected to be ascribed from the changes in the content of the alkali-activated product (i.e., hydrate calcium aluminosilicate), which depends on the activator concentration.  ...  A higher activator concentration, as well as a lower solid/liquid ratio, generally led to serious geopolymers drying shrinkage.  ...  At the same solid/liquid ratio (28 d), when the activator concentration is 30%, the increase is the largest, from 7.23 MPa to 17.92 MPa, but the smallest increase is at 70%, from 27.43 MPa to 32.62 MPa  ... 
doi:10.1155/2021/6631316 fatcat:wtqhhc5ifffwvln7mt35r7x5hm

Multiscale Graphene Topographies Programmed by Sequential Mechanical Deformation

Po-Yen Chen, Jaskiranjeet Sodhi, Yang Qiu, Thomas M. Valentin, Ruben Spitz Steinberg, Zhongying Wang, Robert H. Hurt, Ian Y. Wong
2016 Advanced Materials  
Contrast-enhanced SEM images of G 1 -1D wrinkles from the GO concentration at (a) 0.657, (b) 0.329, (c) 0.219, and (d) 0.066 mg mL -1 . (e) Their Fourier transform spectra are shown.  ...  By decreasing the GO concentration from 0with different thickness in either uniaxial (SEM images shown in a-d) or biaxial (SEM images shown in e-h) G 1 shrinkage, the wrinkles/crumples with variable surface  ... 
doi:10.1002/adma.201506194 pmid:26996525 fatcat:a77dleadyfdklln3653ohhggbu

Noise reduction in astronomical spectra using wavelet packets

M. Fligge, S. K. Solanki
1997 Astronomy and Astrophysics Supplement Series  
It clearly separates the signal from the noise, in particular also at the noise-dominated highest frequencies.  ...  We test this method on intensity and circularly polarized spectra of the sun and compare with Fourier and other wavelet-based de-noising algorithms.  ...  In Fig. 5b the Fourier and Wavelet shrinkage curves coincides almost completely.  ... 
doi:10.1051/aas:1997208 fatcat:wph42zotvvgk3anppikig24xue

Effect of shrinkage and concentration basis on water diffusivity estimation and oil transfer during deep-fat frying of foods
Efecto del encogimiento y bases de cálculo en la estimación de la difusividad del agua y transferencia de aceite durante el freído por inmersión de alimentos

J. Del Rosario-Santiago, Benemérita Universidad Autónoma de Puebla, H. Ruiz-Espinosa, C.E. Ochoa-Velasco, A. Escobedo-Morales, I.I. Ruiz-López
2022 Revista Mexicana de Ingeniería Química  
Assumptions used in model Water concentration units 2 Method development Fourier number Shrinkage Variable D w c w X w Y w Z w MOS (proposed) θ = (Dw/L)dt Yes Yes 2.42 1.92 4.15 4.71 MOS (proposed) θ =  ...  (a) estimated from c w (no simplifications), (b) estimated from X w (constant density), (c) estimated from Y w (constant concentration of fat-free solids), and (d) estimated from Z w (constant concentration  ... 
doi:10.24275/rmiq/alim2667 fatcat:cvytouowbvcodiwqgq3mz6dw3m

Development and characterization of glycerol coating on the PAN/PVDF composite membranes

M K Chan, C S Ong, P Kumaran
2018 IOP Conference Series: Materials Science and Engineering  
It was found that with increasing glycerol concentration from 0 to 30 vol%, the membranes exhibited higher water flux due to lower contact angle and larger pore size.  ...  The percentage of shrinkage, pore size, porosity and the water permeation of the membranes were also studied.  ...  Acknowledgement The authors gratefully acknowledge the financial support from SEGi Research Fund (Project number: SEGi/2015-01/FOEBE-15/84)  ... 
doi:10.1088/1757-899x/458/1/012006 fatcat:l623namo2ffwpldgjamxtgrdlm

N-body codes

Sverre J. Aarseth
2006 Proceedings of the International Astronomical Union  
In this short review we concentrate mainly on these aspects which are vital for further progress.  ... Downloaded from  ... 
doi:10.1017/s1743921307011210 fatcat:kqvgamsub5fink5ov6xln2sgki

Gap junction structures. VIII. Membrane cross-sections

G.E. Sosinsky, J.C. Jésior, D.L. Caspar, D.A. Goodenough
1988 Biophysical Journal  
Radiation-induced shrinkage can be accounted for by mass loss principally from the membrane bilayer.  ...  After normal levels of electron irradiation, the membrane thickness shrinks to about half that of unirradiated controls, but no shrinkage occurs in the hexagonal lattice plane.  ...  Funds to purchase and maintain the Philips EM420T Transmission Electron Microscope were obtained from a Shared Instrumentation grant SIORR02464-01 awarded to Carolyn Cohen by the National Institutes of  ... 
doi:10.1016/s0006-3495(88)83152-7 pmid:2455550 pmcid:PMC1330249 fatcat:irbg2unrj5d2zalx3caambp4ra

Curvelet based image de-noising using beta-trim shrinkage for magnetic resonance images

A. Sumaiya Begum, S. Poornachandra
2014 2014 International Conference on Science Engineering and Management Research (ICSEMR)  
Curvelet transform for de-noising Magnetic Resonance images corrupted with Rician noise using a newly proposed technique called beta-trim shrinkage.  ...  In this paper beta-trim shrinkage is combined with Bayesian thresholding technique to recover the image corrupted with noise. The classical wavelet transform codes homogenous regions effectively.  ...  In wavelet shrinkage, energy of the function will be concentrated in a few coefficients [3] [4] [5] [6] .  ... 
doi:10.1109/icsemr.2014.7043674 fatcat:i7oj7v3oynasnleeeiuzvfvmge

Study of POSS on the Properties of Novel Inorganic Dental Composite Resin

Jiahui Wang, Yizhi Liu, Jianxin Yu, Yi Sun, Weili Xie
2020 Polymers  
With the additions of POSS, the volume shrinkage decreased and the mechanical properties initially increased.  ...  The scanning electron microscopy (SEM), optical microscopy, fourier transform infrared spectroscopy (FTIR), nanoindentation, nanoscratch and three-point flexure tests were performed.  ...  The big size effect of the particles can cause stress concentration under loading.  ... 
doi:10.3390/polym12020478 pmid:32093186 pmcid:PMC7077635 fatcat:ntaugdkr2bhfpdq3k4jngzsrne

Robust adaptive Wiener filtering

Ethan Anderes
2012 2012 19th IEEE International Conference on Image Processing  
A recent paper by Anderes and Paul [1] analyze a regression characterization of a new estimator of lensing from cosmic microwave observations, developed by Hu and Okamoto [2, 3, 4] .  ...  A key tool used in that paper is the application of the robust generalized shrinkage priors developed 30 years ago in [5, 6, 7] to the problem of adaptive Wiener filtering.  ...  Remark 1: In our implementation we partition the Fourier frequencies l into concentric annuli around the origin and construct the posteriors P(ξ|y) and P(φ|y) separately on each annuli.  ... 
doi:10.1109/icip.2012.6467551 dblp:conf/icip/Anderes12 fatcat:brhwecijt5bibg3vr4wr326dem
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