... Title : NONLINEAR VIBRATIONS: A COMPARATIVE STUDY WITH APPLICATIONS TO CENTRIFUGAL PENDULUM VIBRATION ABSORBERS,. ...

BackgroundCardiac dysfunction in boys with Duchenne muscular dystrophy (DMD) is a leading cause of death. Cardiac resynchronization therapy (CRT) has been shown to dramatically decrease mortality in eligible adult population with congestive heart failure. We hypothesized that mechanical dyssynchrony is present in DMD patients and that cardiovascular magnetic resonance (CMR) may predict CRT ...

... or in comparing the absorption efficiency of similar drugs. ... to t = -, and that the plasma concentration is the ... The percentage of drug absorbed at time, t ...

Analysis of heat transfer in solar collectors with heat pipe absorbers is compared to that for collectors with flow through absorbers. Both pumped and thermosiphon systems that produce hot water or other heated fluids are discussed. In these applications the heat pipe absorber suffers a heat transfer penalty ...

A promising means to increase the decay rate of vibration along the rail is using a rail absorber for noise reduction. Compound track models with the tuned rail absorber are developed for investigation of the performance of the absorber on vibration reduction. Through analysis of the track dynamics with the rail ...

The behavior of dynamic vibration absorbers of conventional and novel design has been investigated experimentally and found to compare closely with prediction. The dynamic absorbers were employed to suppress the transmissibility at resonance across a one-...

A non-traditional dynamic vibration absorber is proposed for the minimization of maximum vibration velocity response of a vibrating structure. Unlike the traditional damped absorber configuration, the proposed absorber has a linear viscous damper connecting the absorber mass directly to the ground instead of the ...

Thermal surface absorbers convert all incident radiation to heat at a single local temperature. The fluid flows perpendicular to the radiation`s propagation direction. In contrast, in volumetric absorbers the fluid flows parallel to the radiation`s propagation direction, and the absorber may exhibit temperature stratification along the ...

A new method using an array of MOS transistors formeasuring dose absorbed from ionizing radiation is

... the 6061 composite was comparable to a traditional metal foam in terms of energy absorption capacity (energy absorbed per volume), specific ...

... The spherical model with a layered energy absorbing skull yields highly attenuatcd and smoothed tensile pressure peaks in the brain as compared ...

... The spherical model with a layered energy absorbing skull yields highly attenuated and smoothed tensile pressure peaks in the brain as compared ...

Heat transfer in evacuated-tube solar collectors with heat-pipe absorbers is compared with that for similar collectors with flow-through absorbers. In systems that produce hot water or other heated fluids, the heat-pipe absorber suffers a heat transfer penalty compared with the flow-through ...

We describe a simple technique for producing arrays of silver ellipsoidal particles with parallel principal axes. The optical absorbance of the silver ellipsoids produced by this technique was measured as a function of angle, polarization, and wavelength of the incident light. Calculations of the optical absorbance were made using nonretarded ...

Heat transfer in evacuated-tube solar collectors with heat-pipe absorbers is compared with that for similar collectors with flow-through absorbers. In systems that produce hot water or other heated fluids, the heat-pipe absorber suffers a heat transfer pe...

measurements with CIGS cells were used to compare absorbers fabricated by evaporation and by selenization, and to compare CdS and Cd-partial-electolyte buffer layers....

Burnable absorber usage for pressurized water reactor (PWR) reload cores continues to increase as utilities seek improved fuel efficiency and increased plant availability. Extended cycle lengths, increased fuel burnups, and reduced neutron leakage fuel management strategies have contributed to this trend. To help customers meet their core management objectives, Westinghouse ...

The precision of UV absorbance of intact and acid degraded cephalosporins, ninhydrin, high performance liquid chromatography and iodometric methods used for analysis of cefoxitin, cefotaxime, cephazolin and cephalexin were compared. To obtain the calibration graphs the analytical signal used were: absorbance, first derivative ...

Two challenges facing the use of large area (2mm�2mm) bismuth absorbers for microcalorimetry are uncertainties in the heat capacity of bismuth and the effects of lateral heat conduction and position dependence due to the absorber's large size. We have measured the heat capacity of three Bi samples to be 0.3-0.6JK-1m-3 at 100mK. These ...

Utilization of electromagnetic absorbers under high power is increasing. The absorbers are used in anechoic chambers for performance estimation of high power radars. Variation of the absorption characteristics of the absorbers under such conditions is expected, due to the generation of heat or temperature change. In this paper, first ...

A method is described for generating boundary conditions that can be applied to total fields rather than the usual scattered fields. As compared with the traditional use of absorbing boundary conditions for total-field formulations this method has the adv...

The reduction of thermal neutron density by an absorbing disc is calculated for both cases in which the disc is of large radius and in which the radius is comparable to the mean free path. (D.L.C.)

During the winter of 1979-1980, the Los Alamos Scientific Laboratory devoted seven test cells to comparing the performance of selective absorber coatings and night insulation on Trombe walls and water walls. The results showed that black chrome performed ...

Palladium-109 and holmium-166 are radionuclides with nuclear, physical and chemical characteristics appropriate for therapeutic purposes. Radiation absorbed doses are calculated and compared with currently used radionuclides in synoviotherapy. PMID:2822630

A nondimensional vibration parameters expression is presented which is suitable for design of vibration absorbers. Compared with the single-degree-of-freedom system, the results show that the numerical analyses in parameter design are made to wide frequen...

This paper describes a model of the absorption process in a falling film ammonia-water absorber. The model consists of two ordinary, first-order differential equations with suitable inlet and interface conditions. The model was validated by comparing its ...

A spectrophotometric procedure to determine the purity of barium styphnate monohydrate based upon the absorbance of the styphnate ion at 326 and 413.3 nm has been developed. The purity is determined by comparing the absorbance of the styphnate ion in bari...

Twelve impacts tests on instrumented human cadavers were performed at Wayne State University to compare the load attenuating capability of an energy absorbing earcup with that of the standard rigid earcup used in SPH-4 flight helmets. SPH-4 helmeted cadav...

This study was undertaken to compare methods of calculating the transmittance of cover plate materials and the reflectance of absorber materials. Optical data were obtained for both aged and unaged test specimens using an integrating sphere spectrophotome...

A program of measurements was performed to determine if the size of a source organ affected the absorbed fraction in various target organs. Some results from measurements in a phantom are shown compared with calculated values. 5 figs, 2 tables (GHT)

The lateral punch-through produced by the interaction of a (pi)'s beam with a lead absorber has been measured. The experimental results are compared to the GEANT predictions in order to normalize the dimuon spectrometer simulations. Extrapolation of the r...

Estimates and techniques that are valid to calculate the linear extrapolation distance for an infinitely long circular cylindrical absorbing region are reviewed. Two estimates, in particular, are put into consideration, that is the most probable and the v...

We list the materials that are anticipated to be placed into the Linac Coherent Light Source (LCLS) x-ray free electron laser (XFEL) beam line, their positions, and the absorbed dose, and compare this dose with anticipated damage thresholds.

When compared to a thick absorber mask, a thin absorber EUV mask is expected to have a comparable process window, a reduced shadowing effect, and lower MEEF. However, regardless of the mask absorber thickness, the dark-field in EUV lithography is never 100% dark. Using the same ...

A state-switched absorber (SSA) is a device that is capable of switching between discrete stiffnesses, thus it is able to instantaneously switch between resonance frequencies. The state-switched absorber is essentially a passive vibration absorber between switch events; however, at each switch event the SSA instantly 'retunes' its ...

Radial and chordwise damped vibration absorbers embedded in the rotor blade are compared for rotor lag damping augmentation. Results show that the radial absorber is more effective in transferring damping to the rotor blade lag mode. The chordwise absorber needs to be at a more outboard location and have a larger ...

An analytical method has been proposed to calculate thermodynamic properties of refrigerant-absorbent mixtures of polar molecules. The critical pressure, critical temperature, critical volume and experimental dipole moment and pure components are required in the proposed method. The calculated properties have been compared with the available experimental ...

Proton absorbed doses determined using thermoluminescent, activation and ionization methods are compared. It is shown that dispersion of absorbed dose values determined does not exceed 9-11 percent for proton energies from 82 upto 120 MeV and 18-24 percen...

The 10 cm absorbances of water and deuterium oxide were compared as a function of temperature from 0.8 to 1.8 mu . The results indicate that measurements of aqueous absorption spectra of metallic ions may be extended into the infrared by a factor of 1.4 in wave length by changing from light to heavy water media. (auth)

Some dozens of ultraviolet absorbents were extracted from leaves of pure natural plants, such as frangipani, mango, and sweet-scented osmanthus. Then the spectral properties of these ultraviolet absorbents were analyzed. The plant that has the best effect of absorbing ultraviolet ray was selected by comparing one ...

It is necessary to understand the heat and mass transfer processes and determine the variation of the exergy destruction in the absorber for improving the performance. In this study, the exergy analysis of a coil absorber using water/lithium bromide solution pair is carried out. By using the developed simulation, the effects of variation of parameters ...

The biological effect taking place in the medium as the result of irradiation is determined by the absorbed irradiated energy and its micro and macro distribution in the tissue under irradiation. The quantitative evaluation of irradiation is effected by the measured dose contained in the air and expressed in roentgen units. The necessity to quantitatively evaluate ...

A method based on the use of absorbents as packing materials in the interface of the direct coupling between reversed phase liquid chromatography and gas chromatography (RPLC-GC) is proposed. To that end, a comparative study on different adsorbents and absorbents was carried out. Specifically, Tenax TA and Gaschrom were used as ...

This paper considers the optimization of the performance of a state-switched absorber (SSA) in controlling the vibration of a continuous beam. A state-switched absorber has the capability to instantaneously change its stiffness, which allows the absorber to 'retune' to a new natural frequency instantaneously. Between each 'retuning', ...

... of prostate cancer are higher in blacks than in any other racial group. ... capacity to absorb zinc when compared with other racial groups because of ...

... of prostate cancer are higher in blacks than in any other racial group. ... capacity to absorb zinc when compared with other racial groups because of ...

various types of nonreflecting or absorbing boundary ... flat plate computed with the nonreflective characteristic boundary conditions compared with the ...

Acrylonitrile is readily absorbed in animals following ingestion or inhalation, while dermal absorption is poor (1%) compared to that of the lungs. Acrylonitrile is metabolized to cyanide, which is transformed to thiocyanic acid and by cyanoethylation of ...

A discussion is given of an integral which occurred in the theoretical calculation of the rate of energy absorption. This integral, in the notatton of W. H. Clingman. is compared to a Bessel function. (C.J. G.)

A thin film planar waveguide is studied for application as a chemical sensor for liquid-phase absorbance measurements. The waveguide is comprised of a thin film of tantalum pentoxide deposited on a glass substrate with a pair of diffraction gratings etched into the substrate surface. The buried grating couplers allow the launch and collection optics to be isolated from the ...

Performance and engineering data for design of steel flat plate solar absorbers are briefly presented. Comparisons with copper and aluminum are included. Design parameters which affect thermal performance, producibility and material costs, coating compatibility and application cost for several steel alloys are tabulated. An extensive table comparing ...

A study of the microwave absorbing properties of polymer (epoxy) based nanocomposites is presented. The ferrite nanoparticles employed as filler materials were produced by a co-precipitation method, which was designed for production of large amounts at low cost. The absorbing properties of different kinds of ferrite nanoparticles, soft (manganese) and hard ...

Current ASTM standards concerned with the durability and reliability of absorptive coatings rely on integrated solar absorptance and emittance as the primary methods for assessing changes in absorber optical performance resulting from environmental exposure. This study was undertaken to determine if infrared reflectance measurements are a more sensitive technique for detecting ...

The efficiency of the solar collector consisting of a selective absorber and a selective transparent filter is derived for comparing and evaluating the collectors. The efficiency of Drude mirror type selective transparent filters is calculated in cases of a blackbody absorber and the Al(2)O(3)-Mo-Al(2)O(3)-Mo highly selective ...

The fabrication and performance testing of a single glass cover solar air heater with a packed-bed absorber made of iron shavings as well as one of iron wires and scraps of aluminum are reported. A test procedure recommended by the National Bureau of Standards has been followed during experimentation. The comparative efficiencies of both heaters are ...

This paper investigates suppression of vibrations in 2dof forced linear system with a nonlinear energy sink (NES) attached. Ability of the properly tuned single NES to successfully absorb energy from both excited modes of the linear subsystem is demonstrated. The proposed methodology of the NES tuning is based on the results of analytic treatment. The strongly nonlinear ...

The method to measure absorbed dose to water in a field of carbon ions as applied for the heavy ion therapy project at the Heavy Ion Research Laboratory in Darmstadt (GSI), Germany, is described in detail. Thimble ionization chambers with a water absorbed calibration factor are applied. The dose obtained with this method was compared ...

To derive the absorbed dose to water from a standard of absorbed dose to graphite, the metrology laboratories which apply such a method usually make use of cavity ionization chambers as transfer instruments. In addition, the BNM-LPRI has tested, as such instruments, two types of Fricke dosimeter in its cobalt-60 beam. The two procedures are ...

We investigate the use of complex absorbing potentials for the calculation of partial cross sections in multichannel photofragmentation processes. An exactly solvable, coupled-two-channel problem involving square-well potentials is used to compare the performance of various types of absorbing potentials. Special emphasis is given to ...

This paper describes a model of the absorption process in a falling film ammonia-water absorber. The model consists of two ordinary, first-order differential equations with suitable inlet and interface conditions. The model was validated by comparing its predictions to experimental data. The objective of the work was to define strategies to enhance the ...

The acoustic properties of a compound micro-perforated panel (MPP) absorber array are investigated. The absorber array consists of three parallel-arranged MPP absorbers with different cavity depths. A finite element procedure is used to simulate its acoustic behaviors under normal incidence. Experimental studies are carried out to ...

This paper presents optimal design of a controllable magnetorheological (MR) shock absorber for a passenger vehicle and shows several advantages of the optimized MR shock absorber on vibration control performance. In order to achieve this goal, a cylindrical MR shock absorber, which satisfies design specifications for a mid-sized ...

The water-adsorptive capabilities of Gd2O3@MCM-41 as contrast agents with various gadolinium additions were evaluated by molecular dynamic simulation, which indicates that increasing gadolinum leads to the decrease in water molecules adsorbed on the surfaces of mesoporous silica and Gd2O3 nanocluster. Gd2O3@MCM-41 nanoparticles were synthesized by a one-step method. The ...