Filters








136,628 Hits in 3.0 sec

COMPUTATIONAL GEOMETRY COLUMN 46

JOSEPH O'ROURKE
2004 International journal of computational geometry and applications  
Their software follows this recipe, computing T (1), and then numerically solving the differential equation.  ...  ACM SIGACT News Here r and κ(1) are both n-vectors, and M(t) is the n × n inverse matrix of the Jacobian computed for the polytope P (t).  ... 
doi:10.1142/s021819590400155x fatcat:ytdj3wetengl5dg5flfasc3f7a

Computational geometry column 46

Joseph O'Rourke
2004 ACM SIGACT News  
Their software follows this recipe, computing T (1), and then numerically solving the differential equation.  ...  ACM SIGACT News Here r and κ(1) are both n-vectors, and M(t) is the n × n inverse matrix of the Jacobian computed for the polytope P (t).  ... 
doi:10.1145/1027914.1027926 fatcat:3oxwucinbfevzhnn5ituumrupq

Computational Geometry Column 62

Jean Cardinal
2015 ACM SIGACT News  
Their software follows this recipe, computing T (1), and then numerically solving the differential equation.  ...  ACM SIGACT News Here r and κ(1) are both n-vectors, and M(t) is the n × n inverse matrix of the Jacobian computed for the polytope P (t).  ... 
doi:10.1145/2852040.2852053 fatcat:ifrqku3vfrgfzojwmkjqm7q3ay

Computational Geometry Column 61

Bernardo Ábrego, Adrian Dumitrescu, Silvia Fernández, Csaba D. Tóth
2015 ACM SIGACT News  
Their software follows this recipe, computing T (1), and then numerically solving the differential equation.  ...  ACM SIGACT News Here r and κ(1) are both n-vectors, and M(t) is the n × n inverse matrix of the Jacobian computed for the polytope P (t).  ... 
doi:10.1145/2789149.2789162 fatcat:qos3evf5j5gffjztor234xybk4

Use of circular cylinders as surrogates for hexagonal pristine ice crystals in scattering calculations at infrared wavelengths

Yong-Keun Lee, Ping Yang, Michael I. Mishchenko, Bryan A. Baum, Yong X. Hu, Hung-Lung Huang, Warren J. Wiscombe, Anthony J. Baran
2003 Applied Optics  
Thus it is quite reasonable to use a circular cylinder geometry as a surrogate for pristine hexagonal ice columns for scattering calculations at infrared ͑8 -12-m͒ wavelengths.  ...  We apply the finite-difference time-domain method to compute the optical properties of hexagonal ice columns smaller than 40 m.  ...  It has also been shown that it is not proper to approximate a complex aggregate geometry with a simplified geometry such as a hexagonal column for computing optical properties.  ... 
doi:10.1364/ao.42.002653 pmid:12777000 fatcat:jf2ytlrvknhmdbmumhk54aroh4

Morphometric structural diversity of a natural armor assembly investigated by 2D continuum strain analysis

Swati Varshney, Juha Song, Yaning Li, Mary C. Boyce, Christine Ortiz
2015 Journal of Structural Biology  
The results can be used to develop computational shape morphing algorithms such as our MetaMesh model (Duro-Royo et al., 2014), which defines local, regional, and global hierarchies of design rules of  ...  The technique can also be used to morph a shape into a target geometry with the application of a heterogeneous strain field.  ...  To validate our finite element computation of strain, we show that the computed strain fields comparing a biological scale to the reference geometry can be applied as a heterogeneous strain field to the  ... 
doi:10.1016/j.jsb.2015.10.011 pmid:26481418 fatcat:uu7hxdv7trbmfhwsx4ucdm34pi

Using Powder Diffraction Patterns to Calibrate the Module Geometry of a Pixel Detector

Jonathan P. Wright, Carlotta Giacobbe, Eleanor Lawrence Bright
2022 Crystals  
The precision and accuracy of diffraction measurements with 2D area detectors depends on how well the experimental geometry is known.  ...  A method is described to measure the module geometry in order to obtain accurate strain data using a new Eiger2 4M CdTe detector.  ...  The 2D spot position was given by this computed centroid in one direction, while it corresponds to an integer value (row or column index) in the other direction.  ... 
doi:10.3390/cryst12020255 fatcat:p7lemw5nfvdwbaf3xo4arlya6u

Page 23 of School Science and Mathematics Vol. 29, Issue 1 [page]

1929 School Science and Mathematics  
A study of the table shows that in eight scores computed for each child taking the geometry Test, and in Test IV (problems) in algebra General Mathematics pupils had slightly or no greater chance of being  ...  If it were suggested that the chances were computed so that the median of Group I pupils will be more than 5 points superior in positive scores in Geometry, and more than 1 score superior (less in number  ... 

Harmonic vibrational frequency scaling factors for the new NDDO Hamiltonians: RM1 and PM6

Z. A. Fekete, E. A. Hoffmann, T. Körtvélyesi, B. Penke
2007 Molecular Physics  
A leastsquares approach is used with a training set comprised of 90 singlet-state molecules and 922 distinct vibrations, extracted from the NIST Computational Chemistry Comparison and Benchmark Database  ...  Table: summary statistics of absolute (middle column) and relative deviations (right column). Table: summary statistics of absolute (middle column) and relative deviations (right column).  ...  : summary statistics of absolute (middle column) and relative deviations (right column).  ... 
doi:10.1080/00268970701598089 fatcat:6xaiskbdpzewjoqrhhv3wo4tta

Low-density parity-check codes based on finite geometries: a rediscovery and new results

Y. Kou, S. Lin, M.P.C. Fossorier
2001 IEEE Transactions on Information Theory  
Four classes of LDPC codes are constructed based on the lines and points of Euclidean and projective geometries over finite fields.  ...  Finite-geometry LDPC codes can be decoded in various ways, ranging from low to high decoding complexity and from reasonably good to very good performance.  ...  Therefore, finite-geometry LDPC codes in general require more computations than their equivalent computer-generated LDPC codes with small row and column weights (often column weight is or and the row weight  ... 
doi:10.1109/18.959255 fatcat:luevsonfsjbx7i33dmb3oeatgu

Evaluating long-duration blast loads on steel columns using computational fluid dynamics

Jack W. Denny, Simon K. Clubley
2019 Structure and Infrastructure Engineering  
With limited drag coefficient availability for specific structural geometries, Computational Fluid Dynamics (CFD) can be the only satisfactory approach for analysing blast loading on user-specified, finite  ...  geometries.  ...  simulation times and computational demand.  ... 
doi:10.1080/15732479.2019.1599966 fatcat:i2ub52jvsfcp5iv3dxr3ydn3fu

Synthetic Bone: Design by Additive Manufacturing

D. Barba, E. Alabort, R.C. Reed
2019 Acta Biomaterialia  
Systematic evaluation is then carried out: (i) their accuracy is characterised at high spatial resolution using computed X-ray tomography, to assess manufacturing robustness with respect to the original  ...  The first column shows the ideal lattice, the middle column the reconstruction of the real lattice from computer tomography analysis and the third column the comparison between both.  ...  The first column shows the ideal lattice, the middle column the reconstruction of the real lattice from computer tomography analysis and the third column the comparison between both.  ... 
doi:10.1016/j.actbio.2019.07.049 pmid:31394295 fatcat:mfys5uldyze4rjb5ikcuonit5e

Pressurized water reactor spent nuclear fuel data library produced with the Serpent2 code

Zsolt Elter, Li Pöder Balkeståhl, Erik Branger, Sophie Grape
2020 Data in Brief  
The simulations were done with a PWR fuel pin cell geometry, for both initial UO2 and MOX fuel load for a wide range of initial enrichments (IE) or initial plutonium content (IPC), discharge burnup (BU  ...  The file has 288 columns and 1,321,397 rows in addition to the header row. 789,406 rows describe UO 2 inventories (131 BU steps, 131 CT steps and 46 IE steps as described in the Specifications table).  ...  The first column contains an index, the next 8 columns are presented in Table 1 .  ... 
doi:10.1016/j.dib.2020.106429 pmid:33134449 pmcid:PMC7588691 fatcat:klo4nbkylrf2zcqaz5cmtdqkte

Fast computation of effective diffusivities using a semi-analytical solution of the homogenization boundary value problem for block locally-isotropic heterogeneous media [article]

Nathan G. March, Elliot J. Carr, Ian W. Turner
2020 arXiv   pre-print
We also demonstrate how the new solution method can be applied to complex heterogeneous geometries represented by a grid of blocks.  ...  Direct numerical simulation of diffusion through heterogeneous media can be difficult due to the computational cost of resolving fine-scale heterogeneities.  ...  The effective diffusivities for cases 1-3 are diagonal matrices as each geometry is invariant under a rotation of 180 • [46, 47] .  ... 
arXiv:1812.06680v4 fatcat:y6dl2lrx2vcttacpakfr3o7j3m

Noninvasive recovery of epicardial potentials in a realistic heart-torso geometry. Normal sinus rhythm

B J Messinger-Rapport, Y Rudy
1990 Circulation Research  
A stylized torso that approximates the actual geometry was designed, and its performance in the inverse computations was evaluated.  ...  In addition, application was extended from the above setting, in which the geometry was precisely known and potentials at a large number of leads were measured accurately, to a situation that is more representative  ...  Measured epicardial potential distributions are in left column, and corresponding inverse-computed epicardial potentials are in right column.  ... 
doi:10.1161/01.res.66.4.1023 pmid:2317885 fatcat:cy5li4su6fhqvpowgbquokzdmu
« Previous Showing results 1 — 15 out of 136,628 results