The circumferential incremental Young's modulus was measured in 59 major arteries of both "young" (less than 35 years age) and "old" (greater subjects. Dynamic measurements wall elasticity viscosity were made which indicated a high the femoral arteries. This attributed to their content muscle. Although group showed, at any given pressure, an increasing stiffness towards periphery, arteries, opposite trend found. When dimensional changes (radius thickness) considered it apparent that all...

A new approach to coherent detection is demonstrated which achieves the same high sensitivity as homodyne but without need phase lock local oscillator laser. In addition, 1470 ps/nm of chromatic dispersion compensated with zero net penalty by electronic domain equalization, a result has not been achieved before because zero-penalty equalization possible after direct detection. The method proposes use high-speed digital signal processing technology, and experimental results are obtained using...

We have shown from both simulations and experiments that zwitterion functionalized carbon nanotubes (CNTs) can be used to construct highly efficient desalination membranes. Our predicted functional groups at the ends of CNTs allow a high flux water, while rejecting essentially all ions. synthesized CNT/polyamide nanocomposite membranes with varying loadings assessed these for water desalination. The within polyamide layer were partially aligned through high-vacuum filtration step during...

The hydraulic load presented to the left ventricle by systemic circulation was characterized expressing pressure-flow relationships in ascending aorta as input impedance. This determined spectral or Fourier analysis of simultaneously recorded pressure and flow waves 1 unanesthetized 27 anesthetized dogs. Impedance modulus fell steeply from its value at zero frequency (the peripheral resistance) lowest (less than 1/20th over that band frequencies (usually between 1.5 10 cycle/sec) which...

The advent of digital signal processing (DSP) to optical coherent detection means that more phase estimation options are available, compared the earlier generation where phase-locked loops (PLLs) were invariably deployed in synchronous receivers. Several methods numerically modeled: maximum a posteriori (MAP) estimate, decision directed power law-Wiener filter estimate and law-PLL estimate. An asynchronous case is also modeled. estimates evaluated with respect their tolerance finite laser...

Dynamic elastic moduli (E dyn ) and viscous (ηω) of the arterial wall were obtained at a number sites systemic vascular tree living dogs anesthetized with pentobarbital. Constants calculated using first harmonics pressure diameter from Fourier analysis simultaneously recorded pulse waves. The means standard errors E , in dynes cm -2 x 10 6 mean blood pressures ranging 87 to 130 mm Hg frequencies 1.1 2.8 cps were: 3.0±0.33 (9 midthoracic aortas), 9.8±1.2 (7 midabdominal 11.0 (4 iliac...

The cascade and parallel realizations of an arbitrary digital filter are both formed using second order sections as building blocks. This simple recursive is commonly implemented 2's complement arithmetic for the addition operation. Overflow can then occur at adder resulting nonlinearity causes self-oscillations in filter. character oscillations section here analyzed some detail. A necessary sufficient condition on feedback tap gains to insure stability, even with presence nonlinearity,...

Pressure/flow relationships in the femoral artery have been expressed as vascular impedance of bed. The results obtained were consistent and reproducible under control conditions with irregular well regular heart rates; vasoconstriction vasodilation caused changes predicted from theoretical principles. In a mathematical model similar when realistic values dimensions physical properties bed used. Arterial pressure/flow provide valuable information on beyond.

Changes to surface motifs provide precise tailoring of nanoparticle properties.

If a randomly varying signal or noise is used as input, it possible to study the input-output relations of system, over wide band frequencies, by use power spectrum analysis. This technique has been applied cardiovascular deliberately introducing irregularity in pressure and flow pattern, random electrical pacing heart. Examples are given determination, spectral analysis range 0.25 25 cycles/sec, aortic femoral arterial impedance dog, also transmission ratio for oscillations along aorta. The...

Abstract Despite the great advances in synthesis and structural determination of atomically precise, thiolate-protected metal nanoclusters, our understanding driving forces for their colloidal stabilization is very limited. Currently there a lack models able to describe thermodynamic stability these ‘magic-number’ nanoclusters as function atomic-level characteristics. Herein, we introduce theory, derived from first principles, which address number core atoms thiolates on nanocluster shell....

Atomically precise metal nanoclusters with tailored surface structures are important for both fundamental studies and practical applications. The development of new methods tailoring the structure in a controllable manner has long been sought. In this work, we report reconstruction induced by cadmium doping into [Au23(SR)16]- (R = cyclohexyl) nanocluster, which two neighboring Au atomic sites "coalesce" one Cd site and, accordingly, bimetal [Au19Cd2(SR)16]-, is produced. Interestingly,...

The Telegraph equations have been used to obtain expressions for the following quantities in an attenuating electric transmission line: 1. input impedance terms of length open-circuited line, 2. modulus voltage as a function distance along 3. ` apparent phase velocity at point ' from origin and nature termination, 4. over finite interval same type 5. reflection coefficient (4). Numerical examples computed (1)-(4) are presented. use line model approaching understanding dynamics arterial...

Simple and powerful physics-based adsorption model on nanoparticles is developed using statistics, DFT, tabulated properties.

Rare-earth and actinide complexes are critical for a wealth of clean-energy applications. Three-dimensional (3D) structural generation prediction these organometallic systems remains challenge, limiting opportunities computational chemical discovery. Here, we introduce Architector, high-throughput in-silico synthesis code s-, p-, d-, f-block mononuclear capable capturing nearly the full diversity known experimental space. Beyond space, Architector performs design new including any chemically...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of the crystalline A and B starch polymorphs investigation crystallization by high-resolution carbon-13 CP/MAS NMRR. P. Veregin, C. A. Fyfe, R. H. Marchessault, M. G. TaylorCite this: Macromolecules 1986, 19, 4, 1030–1034Publication Date (Print):April 1, 1986Publication History Published online1 May 2002Published inissue 1 April 1986https://pubs.acs.org/doi/10.1021/ma00158a016https://doi.org/10.1021/ma00158a016research-articleACS...

This is the first of two papers which consider theoretical capabilities computing systems designed from unreliable components. paper discusses memories; second entire systems. Both present existence theorems analogous to information theory. The fundamental result theory that communication channels have a capacity, C, such for all rates less than arbitrarily reliable can be achieved. In analogy with this result, it shown each type memory has an storage redundancies greater 1/C Since...

The work presented here has had two aims; first to determine experimentally the behaviour of oscillatory pressure waves in a rubber tube, when frequency, fluid density and viscosity were varied; secondly compare findings with theoretical treatments, highly simplified electrical transmission-line analogue, second more realistic hydrodynamic theory Womersley.

A cam-driven pump, delivering sinusoidal flow, was used to feed a long, water-filled rubber tube. The resulting pressure oscillations were measured, and analysed into sine cosine terms by relay resolver. From these measurements, determinations made of the input impedance an occluded segment pipe as function its length, driving frequency (4-12 c.p.s.). Measurements also moduli at points along segment, apparent phase velocity oscillations.