Object is measured for mass and center of mass with accuracies of 0.01% and 0.14 respectively, using

Simulation of Electron and Ion Lenses for Mass Spectrometry ... accurate performance simulations of mass spectrometers used for detection and measurement of ...

Bifilar pendulum, if great care is taken to provide accurate measurements, is very accurate (in .... Seismic accelerometers were able to measure mass line ...

Jan 22, 2011 ... Using differential astrometry SIM will search for planets with masses as ... the measurement of accurate dynamical masses for stars in binary ...

An apparatus and method for accurate measurement of a fluid mass in real time are described. The system is effective under conditions of reduced gravity and is used for urine collection and measurement during space flight. Diagrams of the device are provi...

The most accurate mass measurements by far are measurements of charge-to-mass ratios, with the assumption that there is only one fundamental unit of charge. The most accurate of such antimatter mass measurements, by orders of ...

Jan 22, 2011... the measurement of accurate dynamical masses for stars in binary systems. ... dc.title, Taking the Measure of the Universe : precision ...

The object of the paper is to show how to make highly accurate mass measurements using an appropriate electronic balance without the use of external mass standards. The method eliminates the need for a set of external mass standards and, therefore, the ne...

Gaia will provide astrometric measurements accurate enough for deriving the masses of spectroscopic binary (SB) components with uncertainties around 1%. A list of a bit less than 100 SB is set up for that purpose. However, the spectroscopic elements of these systems need to be derived again from accurate radial ...

A method for the accurate mass measurement of negative radical ions by matrix-assisted laser desorption/ionisation time-of-flight mass spectrometry (MALDI-TOFMS) is described. This is an extension to our previously described method for the accurate mass ...

Accurate estimation of snow mass is important for the characterization of the hydrological cycle at different space and time scales. For effective water resources management, accurate estimation of snow storage is needed. Conventional snow gauges measure ...

Trace-level components of mixtures were successfully identified or confirmed by mass spectrometric accurate mass measurements, made at high resolution with selected ion recording, using GC and LC sample introduction. Measurements were made at 20 000 or 10 000 resolution, respecti...

Virtually all hydrocarbons are bought and sold by volume, i.e., gallons, barrels, standard cubic feet per meter, liters, etc. But variations in component content and density make it difficult to measure NGLs in this conventional manner. This paper reports how measuring NGLs first by mass measurement is more ...

The air surrounding a projectile affects the projectile's motion in three very different ways: the drag force, the buoyant force, and the added mass. The added mass is an increase in the projectile's inertia from the motion of the air around it. Here we experimentally measure the added mass of a spherical ...

The Penning trap mass spectrometer SMILETRAP is designed for precision mass measurements using the merits of highly charged ions. In this paper we describe the feature of SMILETRAP and give examples of mass measurements involving , , and ions. These emphasize the importance of ...

Atomic masses and isotopic abundances are independent and complementary properties for discriminating among ion compositions. The number of possible ion compositions is greatly reduced by accurately measuring exact masses of monoisotopic ions and the relative isotopic abundances...

We have measured the atomic masses of ten species with a typical accuracy of 10(exp-10) by comparing the cyclotron frequencies of 20 different pairs of alternately trapped ions. The mass of (28)Si provides a possible route to realizing an atomic standard ...

A knowledge of permeability is required to accurately assess and/or predict seepage conditions within a rock mass. This report reviews techniques available for measuring rock mass permeability and provides guidance concerning their application and interpr...

Exact mass measurements were obtained for a variety of potassium- and tetra-n-butylammonium organotrifluoroborates using commercially available organic sulfate salts as internal reference standards. Accuracies were determined within 5 ppm using a sector ESI mass spectrometer operating in the negative ionization mode.

High-resolution mass spectrometry has become ever more accessible with improvements in instrumentation, such as modern FT-ICR and Orbitrap mass spectrometers. This has resulted in an increase in the number of articles submitted for publication quoting accurate mass data. There is a plethora of terms related to ...

... Calibration of the Toledo scale showed it to be accurate to within 0.5 lb . An error of 0.5 lb m m in measuring the mass of water in the tank resulted ...

... INTRODUCTION A Thrust Stand micro-Mass Balance (TSMB) has been developed to accurately measure the thrust (or impulse) and change in ...

Magnetic resonance imaging (MRI) will be performed pre-and post-flight as the most accurate means of measuring cardiac mass, including sufficient ...

A novel diagnostic method is described that utilizes a thrust stand mass balance (TSMB) to directly measure time-accurate mass flow from a solid-fuel thruster. The accuracy of the TSMB mass flow measurement technique was demonstrated in three ways including the use of an ...

A novel diagnostic technique has been developed, utilizing the Thrust Stand Mass Balance, to directly measure a time accurate mass flow from a solid-fuel thruster for systems where the mass flow rate is of the same order as the experimental error. The mas...

A novel diagnostic technique has been developed, utilizing the Thrust Stand Mass Balance, to directly measure a time accurate mass flow from a solid-fuel thruster for systems where the mass flow rate is of the same order as the experimental error. The mas...

In this activity, learners use basic measurements of the Earth and pieces of rock and iron to estimate the mass of the Earth. Learners will calculate mass, volume, and density, convert units, and employ the water displacement method. To calculate an even more accurate estimate of the mass of ...

The object of the paper is to show how to make highly accurate mass measurements using an appropriate electronic balance without the use of external mass standards. The method eliminates the need for a set of external mass standards and, therefore the need to have these ...

An accurate determination of the bone mineral mass of lumbar vertebrae is needed as a measurement of bone demineralization in weight-bearing bones in addition to the more routinely performed measurements of the extremities. A system was developed utilizin...

The masses of six neutron-deficient rare holmium and thulium isotopes close to the proton drip line were determined with the SHIPTRAP Penning trap mass spectrometer. For the first time the masses of the proton-unbound isotopes {sup 144,145}Ho and {sup 147,148}Tm were directly measured. The proton separation ...

High-precision pulsar timing relies on a solar system ephemeris in order to convert times of arrival (TOAs) of pulses measured at an observatory to the solar system barycenter. Any error in the conversion to the barycentric TOAs leads to a systematic variation in the observed timing residuals; specifically, an incorrect planetary mass leads to a ...

High-precision pulsar timing relies on a solar system ephemeris in order to convert times of arrival (TOAs) of pulses measured at an observatory to the solar system barycenter. Any error in the conversion to the barycentric TOAs leads to a systematic variation in the observed timing residuals; specifically, an incorrect planetary mass leads to a ...

placed at the center. For these measurements, myoglobin was used as the calibrant. The samples were also mixed with myoglobin and run again for more accurate mass determination with an internal calibration experiments in the following way. The mass spectra of the mixture of the gliadin sample with the myoglobin

Jul 2, 2008 ... Glenn Research Center. Skip Navigation (press 2) ... When working in low gravity , it is difficult to accurately measure the mass of ... Developing Techniques for Evaluating Separator Materials for Lithium-Ion Batteries ...

In response to pending regulation to control mercury emissions in the United States and Canada, several projects have been conducted to perform accurate mass balances at pulverized coal (pc)-fired utilities. Part of the mercury mass balance always include...

A method for the accurate mass measurement of positive radical ions by matrix-assisted laser desorption/ionisation time-of-flight mass spectrometry (MALDI-TOFMS) is described. Initial use of a conjugated oligomeric calibration material was rejected in favour of a series of ...

For the past decade, we have used double focusing mass spectrometers to determine compositions of ions observed in mass spectra produced from compounds introduced by GC based on measured exact masses of the ions and their +1 and +2 isotopic profiles arising from atoms of ...

Eclipsing binaries are the only systems that provide accurate fundamental parameters of distant stars. Currently, only a handful of accurate measurements of stars with masses between 40-80 Msun have been made. We propose to make accurate measurements of the ...

This paper describes the use of the relative isotopic mass defect, which is the mass defect between the monoisotopic mass of an element and the mass of its A + 1 or its A + 2 isotopic cluster. The relative isotopic mass defect is combined with the intensity of the isotopic cluster and a formula ...

In a pilot plant gasification program, the measurement and control of major process variables such as flow, temperature, pressure, density and level are essential to develop accurate material balance and reliable scale-up data. Of these, solids mass flow ...

A review is given of nonleptonic decays of D mesons. Measurements of the psi (3772), the accurate determination of D masses and their consequences, inclusive measurements and tagged events are given. 36 references. (ERA citation 03:034070)

An accurate measuring assembly using permalloy transducers for an electromagnet injection field H = 90 gauss and excitation from the main power supply is described. The maximum error is 0.1%. (R.V.J.)

This paper uses accurate Fermi surface measurements as a test of hybridization models in CeSb. Detailed measurements of the Fermi surface geometry and effective masses are presented which show a number of unusual properties associated with the magnetic st...

This resource is an informative and entertaining fact sheet on the history of the kilogram, the SI unit for measuring mass. It is the last remaining base unit to be defined as a "physical object". Often, it is difficult for beginning students to understand the kilogram in terms of a fundamental constant. This site discusses the 100-year quest to find a ...

The combination of high-precision gamma-ray measurements with precision mass determinations allows determination of fundamental constants, such as the neutron mass and the molar Planck constant. The basic principle of these measurements will be discussed. Experimental results from measurements ...

The combination of high-precision gamma-ray measurements with precision mass determinations allows determination of fundamental constants, such as the neutron mass and the molar Planck constant. The basic principle of these measurements will be discussed. Experimental results from measurements ...

The effective use of deadweight and dewpoint equipment is reviewed in this paper. Deadweight gauges are commonly used for the accurate measurement of gas or liquid pressures in pipe lines, refineries, petro-chemical plants, power plants, and in laboratories where accurate pressure measurement is required. ...

A method for on-line accurate monitoring and precise control of molecular beam epitaxial growth of Groups III-III-V or Groups III-V-V layers in an advanced semiconductor device incorporates reflection mass spectrometry. The reflection mass spectrometry is responsive to intentional perturbations in molecular fluxes incident on a ...

This invention is comprised of a method for on-line accurate monitoring and precise control of molecular beam epitaxial growth of Groups III-III-V or Groups III-V-V layers in an advanced semiconductor device incorporates reflection mass spectrometry. The reflection mass spectrometry is responsive to intentional perturbations in ...

A method for on-line accurate monitoring and precise control of molecular beam epitaxial growth of Groups III-III-V or Groups III-V-V layers in an advanced semiconductor device incorporates reflection mass spectrometry. The reflection mass spectrometry is responsive to intentional perturbations in molecular fluxes incident on a ...

to calculate the most accurate measurement of the H I mass function (HIMF) of galaxies to date Catalogue, which is a complete, but smaller, sub-sample of galaxies. The cosmological mass density of H I universe. Once an accurate HIMF has been measured, it can be used to ...

The beta spectrum of the decay of free molecular tritium has been accurately measured in order to search for a finite anti nu/sub e/ mass. The final state effects in molecular tritium are accurately known and the data thus yield an essentially model indep...

During studies of neonatal piglet growth it is important to be able to accurately assess changes in body composition. Previous studies have demonstrated that quantitative magnetic resonance (QMR) provides precise and accurate measurements of total body fat mass, lean mass and total body water ...

Today, it is necessary to identify relevant compounds appearing in discovery and development of new drug substances in the pharmaceutical industry. For that purpose, the measurement of accurate molecular mass and empirical formula calculation is very important for structure elucidation in addition to other available analytical methods. ...

The use of an on-line mass spectrometer to make direct mass measurements of short-lived isotopes far from the stability line has been improved to yield more accurate mass measurements for 27-30Na, new mass measurements for 11Li, ...

Penning trap mass measurements of neutron-deficient Cd isotopes Cd99-109 have been performed with the ISOLTRAP mass spectrometer at ISOLDE/CERN, all with relative mass uncertainties below 3�10-8. A new mass evaluation has been performed. The mass of Cd99 has been ...

The accurate determination of atomic masses and the high-precision measurement of the bound-electron g factor are prerequisites for the determination of the electron mass, which is one of the fundamental constants of nature. In the 2002 CODATA adjustment [P.J. Mohr, B.N. Taylor, Rev. Mod. Phys. 77 (2005) 1], the ...

Sampling has been something of a haphazard operation. This work covers the step-by-step installation of an effective and accurate method of collecting a composite sample by the use of measurement interface and by maintaining the product as it is in the pipeline from the start of the operation to the final analysis. The best approach to accomplish ...

A magnetic flux measuring system was converted for the identification of M/e positions in a 6-inch radius, directional focusing, mass spectrometer. The voltage generated by a synchronous motor-driven rotating coil'' placed in the magnetic field of the analyzer section of the mass spectrometer is ...

Method of measuring mechanical characteristics of human palm against small impact force is proposed. Medical doctors qualitatively evaluate the mechanical characteristics of the human body by manipulation and percussion. In the field of bioengineering, accurate quantitative analysis of the mechanical characteristics of the human body is required. In this ...

Although it has been over 50 years since the neutrino was postulated by Pauli and nearly 35 years since the first experimental evidence of neutrinos was observed by Reines and Cowan, the question of whether the neutrino has a non-zero mass still remains unanswered. Today, more than a dozen experiments observing the beta-decay of tritium are underway in the quest for an answer ...

Phosphodiesterase type 5 (PDE-5) inhibitors are a class of drugs used primarily in the treatment of erectile dysfunction. The Food and Drug Administration (FDA) approved PDE-5 inhibitors include sildenafil citrate, vardenafil hydrochloride and tadalafil. In this study, accurate mass measurements were made by electrospray ionization ...

... AD0244448. Title : A PROCEDURE FOR THE ACCURATE MEASUREMENT OF INFRARED DICHROISM OF ORIENTED FILMS. ...

... Title : A METHOD OF ACCURATELY MEASURING DYNAMIC STABILITY DERRIVATIVES IN TRANSONIC AND SUPERSONIC WIND TUNNELS,. ...

The beta spectrum of the decay of free molecular tritium has been accurately measured in order to search for a finite anti nu/sub e/ mass. The final state effects in molecular tritium are accurately known and the data thus yield an essentially model independent upper limit of 29 eV on the anti nu/sub e/ ...

The detection, identification, confirmation, and quantitation of pesticides in fruits and vegetables are typically performed from a list of suspect compounds or targets. However, there is mounting concern that pesticides not targeted are finding their way into the food supply. This chapter describes the use of LC with time-of-flight mass spectrometry (LC/TOF-MS) for the ...

Accurate mass density information is critical in high-pressure studies of materials. It is, however, very difficult to measure the mass densities of amorphous materials under high pressure with a diamond anvil cell (DAC). Employing tomography to measure mass density of ...

Accurate mass density information is critical in high-pressure studies of materials. It is, however, very difficult to measure the mass densities of amorphous materials under high pressure with a diamond anvil cell (DAC). Employing tomography to measure mass density of ...

The NPL is the UK's national measurement institute, established in 1900 to develop and apply accurate measurement standards for science and technology. The NPL conducts international research, provides commercial services in calibration, and maintains a collection of publications and reference materials relating to standard ...

A highly accurate method for measuring pentachlorophenol (PCP) concentrations in textile samples was developed. This highly accurate method for the analysis of textile samples is valuable, given the inherent challenges associated with the complexity of the sample matrix. This method can be applied to certify the concentration of ...

The density determination of a small solid object with a mass of only a few hundred milligrams is always a difficult and often an ellusive measurement. The advent of highly accurate hydrostatic weighing techniques and the density scale based on solid obje...

Work on the determination of the polymeric composition of LiF vapor in equilibrium with the condensed phase was continued using beam modulation mass spectrometry. It was found that accurate experimental measurements could not be made for LiF and Li3F2 bec...

Explains the phenomenon of Brownian motion, which serves as a mathematical model for random processes. Topics addressed include kinetic theory, Einstein's theory, particle displacement, and others. Points out that observations of the random course of a particle suspended in fluid led to the first accurate measurement of atomic mass. ...

A new type of electroless deposition monitor has been constructed from a monolithic acoustic wave device utilizing plate modes with shear displacement components. This device, which operates at 158 MHz, provides a highly accurate means of measuring mass c...

... accurate cluster mass measurements can place strong constraints on cosmological models. Using AXAF ACIS-I we will observe a sample of distant clusters ...

... accurate cluster mass measurements can place strong constraints on cosmological models. Using AXAF ACIS-I we will observe a sample of distant clusters ...

Results obtained from the PROGNOZ-8 ion composition experiment which indicates that He(+) ions may be more abundant in the solar wind than previous measurements have indicated. The experiment has a sufficiently high mass resolution to accurately discrimin...

Using advanced, novel signal processing techniques, we have measured the rapidly changing, spatial mass neuroelectric patterns associated with preparation and execution of precise right- and left-hand finger pressures in response to visual numeric stimuli...

The likely role of atmospheric atomic oxygen in the recession of spacecraft surfaces and in the shuttle glow has revived interest in the accurate measurement of atomic oxygen densities in the upper atmosphere. The Air Force Geophysics Laboratory is supply...

Faraday cups have proven to be very reliable and accurate instruments capable of making 3-D velocity distribution measurements on spinning or 3-axis stabilized spacecraft. Faraday cup instrumentation continues to be appropriate for heliospheric missions. ...

... columns were 5-8 mm long and masses ranged from 0.58 g to only 0.08 g. Accurate, reproducible detonation velocity measurements have been ...

...the number of organic HAP in the exhaust stream exceeds five, you must take into account the use of multiple chromatographic columns and analytical techniques to get an accurate measure of at least 90 percent of the total organic HAP mass...

Measurement of the special nuclear material (SNM) content of a vessel containing a homogeneous liquid solution consists of three principal operations: (1) measurement of liquid mass (either by weighing directly or by measuring the volume, temperature, and specific gravity); (2) obtaining a representative sample of ...

Progress is reviewed towards the development of a global strategy that aims to extend the sensitivity, dynamic range, comprehensiveness and throughput of proteomic measurements based upon the use of high performance separations and mass spectrometry. The approach uses high accuracy mass measurements from Fourier ...

The electron impact mass spectra of 22 compounds, grouped in five series, containing the oxindole, pseudoindoxyle and indolenine rings, some of them with potential pharmacological interest, have been studied, and their fragmentation patterns have been proposed on the basis of metastable studies, accurate mass ...

The electron impact (EI) mass spectra of 2,6-di-tert-butyl-4-methylphenol (BHT) and certain of its alteration products are described in detail. Accurate mass measurements confirm the element compositions of important fragment ions in the EI spectra. Colli...

Hybrid two-stage mass spectrometers capable of both highly accurate mass measurement and high throughput MS/MS fragmentation have become widely available in recent years, allowing for significantly better discrimination between true and false MS/MS peptide identifications by the application of a relatively narrow ...

The spatial distribution of proteins in tissue sections can be used to identify potential markers for pathological processes. Tissue sections are often subjected to enzymatic digestion before matrix-assisted laser desorption/ionization (MALDI) imaging. This study is targeted at improving the on-tissue identification of tryptic peptides by accurate mass ...

A microfabricated mass-sensitive chemical preconcentrator actively measures the mass of a sample on an acoustic microbalance during the collection process. The microbalance comprises a chemically sensitive interface for collecting the sample thereon and an acoustic-based physical transducer that provides an electrical output that is ...

Observations of H2O masers from circumnuclear disks in active galaxies for the Megamaser Cosmology Project (MCP) allow accurate measurement of the mass of supermassive black holes (BH) in these galaxies. We present the Very Long Baseline Interferometry images and kinematics of water maser emission in six active galaxies: NGC 1194, NGC ...

The limiting uncertainty in recent high accuracy measurements of the mass attenuation coefficient is the measurement of the integrated column density. An improvement in the design of the absorption foil holder is described which reduces the integrated column density uncertainty. The new design allows the edges of the foil to be more ...

We report herein, a facile metabolite identification workflow on the antimicrobial strictosamide, which is derived from accurate mass measurement by a hybrid ion trap-TOF mass spectrometer. In step 1, the parent drug and metabolites in rat bile were separated on an HPLC column followed by ion trap-TOF ...

The Penning trap mass spectrometer SHIPTRAP at GSI Darmstadt allows accurate mass measurements of radionuclides, produced in fusion-evaporation reactions and separated by the velocity filter SHIP from the primary beam. Recently, the masses of the three nobelium isotopes No252-254 were ...

The mass excess of exp 48 K was measured to be -32.117 +or- .027 MeV using the exp 48 Ca( exp 7 Li, exp 7 Be) exp 48 K reaction at 52 MeV. The result is consistent with predictions and a previous less accurate measurement. There is evidence for an excited...

This article informs the reader of changes in the field of surface and thermal ionization isotopic mass spectrometer measurements since the Manhattan Project of World War II. The author compares the new and old data in diagrams and tables, and discusses the instrumental and procedural changes which resulted in more accurate ...

While investigating the in-source CID fragmentation of nonsteroidal antiinflammatory drugs (NSAIDs), it was noticed that the same fragment ion (nominal mass) formed in either positive or negative ion electrospray for a suite of NSAIDs. For example, ibuprofen with a molecular mass of 206, fragments to the m/z 161 ion in negative ion from its deprotonated ...

According to Cities Service, the required accuracy of metering LNG is increasing as its cost continues to rise. There are several factors to consider when selecting a metering system or arrangement for LNG. Details are presented on measuring, equipment, mass measurement, and sample analysis. LNG metering may be for custody transfer, ...

As demonstrated by Cities Service Oil Co., Tulsa, mass measurement of LP-gases provides an accurate measuring system that does not depend upon unknown physical properties for correcting the measurement to standard conditions. The system is applicable to mixtures containing ethane or ethylene ...

We examine resonant slepton production at the LHC with gravitinos in the final state. The slepton undergoes gauge decay into a neutralino and a lepton, the neutralino decays into a photon and a gravitino. By measuring the transverse masses of the ?G~ and the l?G~ subsystems it is possible to accurately reconstruct both the slepton and ...

The Antiproton Source Accumulator has been used by Fermilab experiments E760 and E835 to search for and measure the various states of charmonium below the open charm threshold. Accurate determination of the resonance parameters (mass, width, and branching ratios) of these states requires a precise measurement of ...

The x-ray mass-attenuation coefficients of gold are measured at 91 energies between 14 keV and 21 keV using synchrotron radiation. The measurements are accurate to between 0.08% and 0.1%. The photoelectric mass-absorption coefficients and the imaginary component of the form factors of gold are ...

Relations among the masses of neighboring nuclei provide a convenient and reasonably accurate method for the estimation of unknown masses. A set of such relations is presented. Each member of this set gives a prediction of roughly equal statistical accuracy for the unknown mass of a given nuclide. The average and ...

Calorimetry is a primary measurement technique for assay of quantities of plutonium in the United States. It is the most accurate NDA technique for many forms of plutonium-bearing materials. This paper provides an overview of the use of calorimetry in combination with high-resolution gamma-ray spectroscopy for accurate plutonium ...

In space, projectiles with hypervelocity can deliver large amounts of energy to the target. Long range and high accuracy are essential. This report presents a method of improving the accuracy of hypervelocity vehicles by measuring the output velocity and correcting the direction by impulse from a laser beam normal to the projectile flight path. The ...

The structural elucidation of small molecules using mass spectrometry plays an important role in modern life sciences and bioanalytical approaches. This review covers different soft and hard ionization techniques and figures of merit for modern mass spectrometers, such as mass resolving power, mass accuracy, ...

The structural elucidation of small molecules using mass spectrometry plays an important role in modern life sciences and bioanalytical approaches. This review covers different soft and hard ionization techniques and figures of merit for modern mass spectrometers, such as mass resolving power, mass accuracy, ...

Recently, high-resolution mass spectrometry has been largely employed for compound identification, thanks to accurate mass measurements. As additional information, relative isotope abundance (RIA) is often needed to reduce the number of candidates prior to tandem MS(n). Here, we report on the evaluation of the ...

Proper calibration of a line densitometer will help ensure accurate measurement of liquid density in a petroleum-products pipeline. The best method for field calibration of a densitometer is with a pycnometer. Care in use of the pycnometer method is a key in the calibration test's reliability. Mass ...

In principle, dual-energy CT can only accurately decompose a mixture into two materials. To decompose a mixture into three constitute materials using dual-energy CT measurements, a third criteria must be provided to solve for three unknowns with only two spectral measurements. One solution is to assume that the sum of the volumes of ...

The Detector for Advanced Neutron Capture Experiments (DANCE) is a 162-element 4{pi} BaF2 array designed to make neutron capture cross-section measurements on rare or radioactive targets with masses as little as one milligram. Accurate capture cross sections are needed in many research areas, including stellar nucleosynthesis, advanced ...

The Detector for Advanced Neutron Capture Experiments (DANCE) is a 162-element 4? BaF2 array designed to make neutron capture cross-section measurements on rare or radioactive targets with masses as little as one milligram. Accurate capture cross sections are needed in many research areas, including stellar nucleosynthesis, advanced ...

Current algorithms for quantifying peptide identification confidence in the accurate mass and time (AMT) tag approach assume that the AMT tags themselves have been correctly identified. However, there is uncertainty in the identification of AMT tags, because this is based on matching LC-MS/MS fragmentation spectra to peptide sequences. In this paper, we ...

This research program is concerned with measuring atomic masses and decay schemes of short-lived, neutron-rich fission products with the TRISTAN on-line mass separator located at the High Flux Beam Reactor (HFBR), Brookhaven National Laboratory. The determination of accurate masses for neutron ...

We have used aperture masking interferometry and adaptive optics (AO) at the Palomar 200 inch telescope to obtain precise mass measurements of the binary M dwarf GJ 623. AO observations spread over 3 yr combined with a decade of radial velocity measurements constrain all orbital parameters of the GJ 623 binary system ...

With the nowadays achievable accuracy in Penning trap mass spectrometry on short-lived exotic nuclides as well as stable atoms, precision fundamental tests can be performed, among them a test of the Standard Model, in particular with regard to the weak interaction, the CPT symmetry conservation, and the unitarity of the Cabibbo-Kobayashi-Maskawa quark mixing matrix. In ...

The beta spectrum of the decay of free molecular tritium has been accurately measured in order to search for a finite anti nu/sub e/ mass. The betas originating from the decay of free tritium molecules in a differentially pumped source region were momentum analyzed in a toroidal beta spectrometer with 36-eV resolution. The final state ...

Sound scoring methods for sequence database search algorithms such as Mascot and Sequest are essential for sensitive and accurate peptide and protein identifications from proteomic tandem mass spectrometry data. In this paper, we present a software package that interfaces Mascot with Percolator, a well performing machine learning method for rescoring ...

The Viking gas chromatograph mass spectrometer experiment provided significant data on the atmospheric composition at the surface of Mars, including measurements of several isotope ratios. However, the limited dynamic range of this mass spectrometer resulted in marginal measurements for the important Kr and Xe ...

Using a novel orbitrap mass spectrometer, the authors investigate the dynamic range over which accurate masses can be determined (extent of mass accuracy) for short duration experiments typical for LC/MS. A linear ion trap is used to selectively fill an intermediate ion storage device (C-trap) with ions of ...

We used synchrotron x rays to measure the x-ray mass attenuation coefficients of gold at nine energies from 38 to 50 keV with accuracies of 0.1%. Our results are much more accurate than previous measurements in this energy range. A comparison of our measurements with calculated ...

We used synchrotron x rays to measure the x-ray mass attenuation coefficients of gold at nine energies from 38 to 50 keV with accuracies of 0.1%. Our results are much more accurate than previous measurements in this energy range. A comparison of our measurements with calculated ...

We have developed a technique to simultaneously compare the cyclotron frequencies of two single ions to obtain atomic mass ratios with fractional accuracies at or below 10-11. Much like a balance scale, this two-ion technique cancels many sources of noise and error - chief among them magnetic field noise. The new mass comparisons are used in combination ...

Accurate measurement of the concentration of pulverized coal in various pipes plays a key role in assuring safe and economic operation in a pulverized coal-fired boiler in the process of combustion. In this paper, experimental studies are implemented on the measurement of a lean mass flow in a pneumatic conveying ...

An accurate determination of the bone mineral mass of lumbar vertebrae is needed as a measurement of bone demineralization in weight-bearing bones in addition to the more routinely performed measurements of the extremities. A system was developed utilizing the two photon attenuation technique and a modified dual ...

A calibration method was developed for the SMCC (sonic measuring and control cross section) which provides a fast and accurate control and measurement of gas mass flows. The method gives the relation between the pen position and the throughflow surface using a second degree polynomial. The static error of this ...

...denaturants may be made by volume, weight, accurate mass flow meter, or by any...spirits to be denatured by volume, weight, accurate mass flow meter, or other...denaturants to be used by volume, weight, accurate mass flow meter, or...

Percentage of body fat is strongly associated with the risk of several chronic diseases but its accurate measurement is difficult. Bioelectrical impedance analysis (BIA) is a relatively simple, quick and non-invasive technique, to measure body composition. It measures body fat accurately in ...

Percentage of body fat is strongly associated with the risk of several chronic diseases but its accurate measurement is difficult. Bioelectrical impedance analysis (BIA) is a relatively simple, quick and non-invasive technique, to measure body composition. It measures body fat accurately in ...

... Title : AN ACCURATE LABORATORY TEST SYSTEM USING COMMERCIAL EQUIPMENT FOR EDDY CURRENT MEASUREMENTS. ...

Quantitative analysis of liquid chromatography (LC)- mass spectrometry (MS) and tandem mass spectrometry (MS/MS) data is essential to many proteomics studies. We have developed MASIC to accurately measure peptide abundances and LC elution times in low-resolution LC-MS/MS analyses. This software program uses an ...

A comprehensive multi-residue method for the chromatographic separation and accurate mass identification of 101 pesticides and their degradation products using liquid chromatography/time-of-flight mass spectrometry (LC/TOF-MS) is reported here. Several classes of compounds belonging to different chemical families (triazines, ...

This is a continuation of a project begun in Cycle 7 and continued up through Cycle 11. The program consists of annual or biannual WFPC2 or FGS observations of three visual binary stars that will ultimately yield fundamental astrophysical results, once their orbits and masses are determined. Our targets are the following: {1} Procyon {P = 41 yr}, for which our first WFPC2 ...

We report a new tandem mass spectrometric approach for the improved identification of polypeptides from mixtures (e.g., using genomic databases). The approach involves the dissociation of several species simultaneously in a single experiment and provides both increased speed and sensitivity. The data analysis makes use of the known fragmentation pathways for polypeptides and ...

Theoretical tryptic digests of all predicted proteins from the genomes of three organisms of varying complexity were evaluated for specificity and possible utility of combined peptide accurate mass and predicted LC normalized elution time (NET) information. The uniqueness of each peptide was evaluated using its combined mass (+/- 5 ppm ...

Recent calculations have significantly decreased the scheme and residual scale dependence of basic radiative corrections of the Standard Electroweak Model. This leads to a theoretically accurate prediction of the W-boson mass MW, as well as a reduced upper bound for the Higgs boson mass MH. The implications of a precise MW ...

The first half of 1994 was highlighted at TASCC by the funding of the Canadian Penning Trap (CPT) mass spectrometer. It will be connected on-line to TASCC via a helium-jet transport system and is expected to yield mass measurements accurate to 10(sup -8) ...

The intravenous anesthetic etomidate was measured in human plasma by mass fragmentography. The method is accurate, sensitive, and specific. Results of the analyses indicate that after a single 0.3-mg/kg iv dose of etomidate, there are at least three phases in its disappearance from human plasma. Detectable plasma concentrations exist ...

Roots and extracts of the kava plant have been used in herbal medicine to treat sleep disturbances, stress and anxiety, although reported cases of liver toxicity led to many countries restricting its sale. The detection of the presence of kava in many medicinal products requires the use of methods capable of identifying the kavalactones with high certainty. Here, we describe the use of Fourier ...

The mass spectrometric behaviour of a series of 6,6-disubstituted dibenzo(d,f)(1,3)dioxepine derivatives have been studied. The fragmentation patterns were described and discussed in detail with the aid of labelled compounds, accurate mass measurements and collisionally induced dissociation experiments performed ...

This report describes factors which affect the thermal performance of built-up roof systems, and a technique for making in-place measurements of thermal resistance. This measurement technique utilizes a combination of infrared thermographic imaging, surface heat-flow meters, and surface thermopiles. The thermal resistance of the roof system is computed ...

This review will describe developments, primarily from our laboratory, in fundamental and applied aspects of separations, and mass spectrometric instrumentation important for making more effective and quantitative proteomics measurements. The basis for better quantitation and ultra-high sensitivity will be highlighted for high resolution capillary liquid ...

Accurate centre-of-mass corrections for geodetic spherical satellites are expected to contribute to accurate determination of the scale of the earth, i.e. , ...

The assessment of total hemoglobin mass (tHb-mass) with the optimized carbon monoxide-rebreathing procedure (oCOR) is discussed as a promising method to detect blood doping. The method requires repeated measurements of the carboxyhemoglobin fraction (%HbCO) using spectrophotometers (CO oximeters). In order to determine whether %HbCO ...

Understanding the composition, structure and dynamics of macromolecules and their assemblies is at the forefront of biological science today. Hydroxyl-radical-mediated protein footprinting using mass spectrometry can define macromolecular structure, macromolecular assembly and conformational changes of macromolecules in solution based on measurements of ...

We propose to obtain high precision, high time resolution X-ray observations of the high mass X-ray binary 4U0900-40, as part of a multi-wavelength campaign to unambiguously measure the mass of the compact companion. UV time series obtained with HST reveal the presence of reprocessed X-ray pulses emanating from the atmosphere of the ...

It is possible to determine the mean molecular mass of a planetary atmosphere using pressure and temperature measurements made by an entry probe descending at terminal velocity. The descent trajectory of an entry probe can be determined from pressure, temperature, and mean molecular mass data. This technique offers redundancy for large ...

Projectile fragments separated in flight with the FRS have been injected into the storage ring ESR. Operating the ESR in the isochronous mode has enabled high-resolution mass measurements of short-lived isotopes. Already in our pilot experiments the Isochronous Mass Spectrometry (IMS) has provided accurate results ...

For many decades the accurate and precise determination of isotope ratios has remained a very strong interest to many researchers due to its important applications in earth, environmental, biological, archeological, and medical sciences. Traditionally, thermal ionization mass spectrometry (TIMS) has been the technique of choice for achieving the highest ...

This research's focus was to build a prototype of a computerized liquid dispensing system. This liquid metering system is based on the concept of altering the representative volume to account for temperature changes in the liquid to be dispensed. This is actualized by using a measuring tank and a temperature compensating displacement plunger. By constantly monitoring ...

This research`s focus was to build a prototype of a computerized liquid dispensing system. This liquid metering system is based on the concept of altering the representative volume to account for temperature changes in the liquid to be dispensed. This is actualized by using a measuring tank and a temperature compensating displacement plunger. By constantly monitoring the ...