A unified view on the interfacial instability in a model of aluminium reduction cells in the presence of a uniform, vertical, background magnetic field is presented. The classification of instability modes is based on the asymptotic theory for high values of parameter β, which characterises the ratio of the Lorentz force based on the disturbance current, and gravity. It is shown that the spectr...

we define a new type of spectrum, called δ-approximate spectrum, of an element a in a complex unital banach algebra a and show that the δ-approximate spectrum σ_δ (a) of a is compact. the relation between the δ-approximate spectrum and the usual spectrum is investigated. also an analogue of the classical gleason-kahane-zelazko theorem is established: for each ε>0, there is δ>0 such that if ϕ is...

Characterizing heterogeneity in reservoir rocks at the pore scale is crucial to understand flow patterns better, and estimate petrophysical properties such as porosity permeability. This study introduces multifractals descriptors for rock samples’ scale. We analyzed twenty samples from sandstone carbonate reservoirs using their 3D X-ray micro-computed tomography images. In addition, we s...

The recycling of marine exploration equipment after it has surfaced is greatly affected by sea state. In order to estimate the state in real time, this paper proposes a method for measuring wave elevation, which modifies integrated results GNSS/SINS up direction virtual horizontal lines extract fluctuation information. From these information, significant heights (SWH) can be calculated as only ...

The apparatus used in the experiment which is the subject of this communication is related to that named after Puccianti.' It consists essentially of identical tubes about 85 cm. long with optically plane parallel ends placed in the arms of an interferometer and filled to the same pressure with hydrogen. A powerful discharge was passed through one of the tubes while "white-light" fringes from a...

To progress in the understanding of the impact of non-linear wave profiles in scattering from sea surfaces, a non-linear model for infinite depth gravity waves is considered. This model, termed the “Choppy Wave Model” (CWM), is based on horizontal deformation of a linear, reference random surface. It is numerically efficient and enjoys explicit second-order statistics for height and slope, whic...

We simulate the measurements of an active bifocal terahertz imaging system to reproduce ability detect internal structure foams having embedded defects. Angular spectrum theory and geometric optics tracing are used calculate incident received electric fields scattered light distribution measured object. The finite-element method is also scattering object for comparison with model. simulations c...

The codling moth, Cydia pomonella (L.) (Lepidoptera: Tortricidae), is a primary pest of apples throughout the United States. Reliance on broad spectrum organophosphates has been declining with the slated cancellation and has shifted towards narrow spectrum insecticides. Novaluron, a chitin synthesis inhibitor, has primarily been used for its ovicidal and larvacidal activities. However, recent s...

We present the results of a joint investigation aimed at constraining the primordial He content (YP ) on the basis of both the Cosmic Microwave Background (CMB) anisotropy and two stellar observables, namely the tip of the Red Giant Branch (TRGB) and the luminosity of the Zero Age Horizontal Branch (ZAHB). Current baryon density estimates based on CMB measurements cover a wide range values 0.00...

β-lactams are antibiotic molecules able to inhibit cell wall biosynthesis. Among other mechanisms, resistance in Gram-negative bacteria is mostly associated with production of β-lactamase enzymes able to bind and hydrolyze the β-lactam ring. Extended-spectrum β-lactamases extend this ability also to third- and fourth-generation cephalosporins, as well as to carbapenems and monobactams. Vibrio c...