Lu, Wanbo Yang, Dong Boudt, Kris

The traditional estimation of higher order co-moments of non-normal random variables by the sample analog of the expectation faces a curse of dimensionality, as the number of parameters increases steeply when the dimension increases. Imposing a factor structure on the process solves this problem; however, it leads to the challenging task of selecti...

Bolea Fernandez, Eduardo Leite, Diego Rua Ibarz, Ana Maria Liu, Tong Woods, Glenn Aramendia, Maite Resano, Martin Vanhaecke, Frank

Brinkmann, Gunnar Zamfirescu, Carol

In 1956, Tutte showed that every planar 4-connected graph is hamiltonian. In this article, we will generalize this result and prove that polyhedra with at most three 3-cuts are hamiltonian. In 2002 Jackson and Yu have shown this result for the subclass of triangulations. We also prove that polyhedra with at most four 3-cuts have a hamiltonian path....

Ardia, David Bluteau, Keven Boudt, Kris

The modern calculation of textual sentiment involves a myriad of choices as to the actual calibration. We introduce a general sentiment engineering framework that optimizes the design for forecasting purposes. It includes the use of the elastic net for sparse data-driven selection and the weighting of thousands of sentiment values. These values are...

De Witte, Chloë Demeyere, Kristel De Bruyckere, Sofie Taminiau, Bernard Daube, Georges Ducatelle, Richard Meyer, Evelyne Haesebrouck, Freddy

Helicobacter suis has been associated with development of gastric ulcers in the non-glandular part of the porcine stomach, possibly by affecting gastric acid secretion and altering the gastric microbiota. Fusobacterium gastrosuis is highly abundant in the gastric microbiota of H. suis-infected pigs and it was hypothesized that this micro-organism c...

CHATTERJEE, S SUGILAL, G PRABHU, SV

Heat transfer in a partially-filled, rotating inclined pipe with water flowing through it is experimentally investigated. The test section is a 1000 mm long stainless steel pipe with 32.8 mm inner diameter and 1.1 mm wall thickness. The outer wall is painted black to improve its emissivity. The outer wall temperature distribution is captured using ...

CHATTERJEE, S SUGILAL, G PRABHU, SV

Single phase heat transfer in a partially-filled, rotating horizontal pipe with axial liquid (water) flow is studied in this work. Thermal imaging is used to capture outer wall temperature of the partially filled rotating heated pipe. Local heat transfer coefficient along the length of the rotating pipe is calculated. Various parameters influencing...

VENUGOPAL, A AGRAWAL, A PRABHU, SV

The influence of Reynolds number and blockage ratio on the vortex dynamics of a trapezoidal bluff body placed inside a circular pipe is studied experimentally and numerically. Lowaspect ratio, high blockage ratio, curved end conditions (junction of pipe and bluff body), axisymmetric upstream flow with shear and turbulence are some of the intrinsic ...

SETHURAMAN, YPM SINHA, K LARSSON, J

In this work, we use numerical simulation and linear inviscid theory to study the thermodynamic field generated by the interaction of a shock wave with homogeneous isotropic turbulence. Fluctuations in density, pressure, temperature and entropy can play an important role in shock-induced mixing, combustion and energy transfer processes. Data from s...

CHAHAL, JS GHORPADE, SR

The Carlitz-Wan conjecture, which is now a theorem, asserts that for any positive integer n, there is a constant C n such that if q is any prime power > C(n )with GCD(n, q - 1) > 1, then there is no permutation polynomial of degree n over the finite field with q elements. From the work of von zur Gathen, it is known that one can take C-n = n(4). On...