Denudation and geomorphic change in the Anthropocene; a global overview

The effects of human activity on geomorphic processes, particularly those related to denudation/sedimentation, are investigated by reviewing case studies and global assessments covering the past few centuries. Evidence we have assembled from different parts of the world, as well as from the literature, show that certain geomorphic processes are experiencing an acceleration, especially since the mid-twentieth century. This suggests that a global geomorphic change is taking place, largely caused by anthropogenic landscape changes

Applying a Robust Heteroscedastic Probabilistic Neural Network to Analog Fault Detection and Classification

Abstract—The problem of distinguishing and classifying the responses of analog integrated circuits containing catastrophic faults has aroused recent interest. The problem is made more difficult when parametric variations are taken into account. Hence, statistical methods and techniques such as neural networks have been employed to automate classification. The major drawback to such techniques has been the implicit assumption that the variances of the responses of faulty circuits have been the same as each other and the same as that of the fault-free circuit. This assumption can be shown to be false. Neural networks, moreover, have proved to be slow. This paper describes a new neural network structure that clusters responses assuming different means and variances. Sophisticated statistical techniques are employed to handle situations where the variance tends to zero, such as happens with a fault that causes a response to be stuck at a supply rail. Two example circuits are used to show that this technique is significantly more accurate than other classification methods. A set of responses can be classified in the order of 1 s. Index Terms—Automatic test pattern generation (ATPG) testing, fault-diagnosis, quiescent supply current (IDDQ), mixed-signal_test. I

NORMAL COORDINATES FOR VINYL FLUORIDE AND THE SEVEN DEUTEROVINYL FLUORIDES

$^{1}$ B. Bak and D. Christensen, Spectrochim, Acta 12, 355 (1958). $^{2}$ J. R. Scherer and W. J. Potts, J. Chem Phys. 31, 1691 (1959).Author Institution: Department of Chemistry, Thermodynamic Research Center Texas A\&M UniversityAnnual coordinate calculation was carried out for these eight isotopic molecules based mainly on the experimental data reported by Bak and $Christensen.^{1}$ A perturbation program was used and the most general quadratic valence force potential function was assumed. A six-constant potential function did reproduce very closely the 24 out-of-plane vibrations. The results agree very well with those of Scherer and $Potts.^{2}$ A least-squares fit of the 72 calculated to the observed in-plane frequencies was obtained using a 45-constant potential function. On the basis of these calculations, the in-plane fundamental vibrational assignments of Bak and Christensen were reexamined and modified. The new assignments as well as the final set of potential functions will be presented and discussed