Revised Reference Curve for the α2-Antiplasmin Assay by the Addition of Detergents

1984 ◽  
Vol 51 (02) ◽  
pp. 297-297 ◽  
Author(s):  
C Kluft ◽  
G Wijngaards ◽  
H van Voorthuizen
Keyword(s):  
Reference Curve

scholarly journals 14C INTERCOMPARISON EXERCISE ON BONES AND IVORY SAMPLES: IMPLICATIONS FOR FORENSICS

Radiocarbon ◽  
2021 ◽  
pp. 1-12
Author(s):  
G Quarta ◽  
M Molnár ◽  
I Hajdas ◽  
L Calcagnile ◽  
I Major ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
International Atomic Energy Agency ◽  
Accelerator Mass Spectrometry ◽  
Reference Curve ◽  
Nuclear Testing ◽  
Energy Agency ◽  
Widespread Application ◽  
Intercomparison Exercise ◽  
High Degree ◽  
Data Calibration

ABSTRACT The application of accelerator mass spectrometry radiocarbon (AMS 14C) dating in forensics is made possible by the use of the large excursion of the 14C concentration in the post-WWII terrestrial atmosphere due to nuclear testing as a reference curve for data calibration. By this approach high-precision analyses are possible on samples younger than ∼70 years. Nevertheless, the routine, widespread application of the method in the practice of forensics still appears to be limited by different issues due to possible complex interpretation of the results. We present the results of an intercomparison exercise carried out in the framework of an International Atomic Energy Agency (IAEA) CRP-Coordinated Research Project between three AMS laboratories in Italy, Hungary, and Switzerland. Bone and ivory samples were selected with ages spanning from background (>50 ka) to 2018. The results obtained allow us to assess the high degree of reproducibility of the results and the remarkable consistency of the experimental determinations.

Transformation in Austenitic Stainless Steel Sheet under Different Loading Directions

2011 ◽  
Vol 473 ◽  
pp. 444-451
Author(s):  
A.H. van den Boogaard ◽  
J. Krauer ◽  
Pavel Hora
Keyword(s):  
Phase Transformation ◽  
Martensitic Transformation ◽  
Sheet Material ◽  
Stress Triaxiality ◽  
Austenitic Stainless Steels ◽  
Tensile Tests ◽  
Sheet Forming ◽  
Uniaxial Tensile ◽  
Reference Curve ◽  
Strain Relation

The stress-strain relation for austenitic stainless steels is based on 2 main contributions: work hardening and a phase transformation from austenite to martensite. The transformation is highly temperature dependent. In most models for phase transformation from austenite to martensite, the stress triaxiality plays an important role also. The sensitivity to triaxiality is often investigated based on uniaxial compression and tensile tests. To validate the common formulation for triaxiality dependence of the martensitic transformation, a series of experiments is performed with the Twente biaxial tester for sheet material. A number of deformation directions are prescribed between plane strain and simple shear. Uniaxial tensile tests were performed at different temperatures to get a temperature corrected reference curve for the martensite–strain relation. The current results for typical stress states in sheet forming do not show the dependency on the triaxiality that is given in literature. This means that for sheet forming simulations, changes in stress state affects the martensitic transformation less than expected from tension–compression experiments.

Bi-Crystal Compensation Method for the Over-Response of Solid-State Dosimetry

2014 ◽  
Vol 605 ◽  
pp. 540-543 ◽  
Author(s):  
Ruo Xi Wang ◽  
Patrick Pittet ◽  
Julien Ribouton ◽  
Guo Neng Lu ◽  
Jean Marc Galvan ◽  
...  
Keyword(s):  
Solid State ◽  
Measured Data ◽  
Compensation Method ◽  
Low Energy ◽  
Field Size ◽  
Reference Curve ◽  
Pencil Beam ◽  
Dose Ratio ◽  
Highly Sensitive

Solid-state dosimetry employs highly sensitive semiconductors such as Gallium Nitride (GaN) and Silicon (Si), but they have a common drawback of over response compared to tissues for low-energy scattered photons, which induces inacceptable errors for radiotherapy application. To tackle this issue, we propose a compensation method consisting in using two different materials of dosimetric interest with different atomic numbers. Their responses are denoted as SC1 and SC2. The response ratio SC1/water as a function of the ratio SC1/SC2 exhibits a monotonic curve that can serve as reference to compensate the over-response of SC1. To validate this method, we have studied the dosimetric response of GaN (0.1 mm3) and Si crystals (2.5 mm3) by simulations, using a validated model based on the general cavity theory in a homogeneous water phantom. The dosimetric response of GaN and Si calculated using the model has errors within 2.5% compared to measured data. The local fluence spectra have been obtained by convolution of pencil beam kernel built by Monte Carlo simulations for different clinical irradiation conditions with field size (from 5×5 cm2up to 20×20 cm2) at depth in the phantom (from 2 cm to 25 cm). The obtained results confirm a monotone relationship between GaN/water dose ratio and GaN/Si dose ratio. The reference curve is independent of irradiation conditions (field size, dosimeter position...), and allows determination of compensation value by identification.

scholarly journals Ultrasound Assessment of Bone Mass in Central Africans Population

2017 ◽  
Vol 2 (4) ◽  
pp. 323
Author(s):  
Joseph-Médard Kabeya-Kabenkama ◽  
Jean Mukaya Tshibola ◽  
Michel Lelo Tshikwela ◽  
Tozin Rahma ◽  
Jean-Jacques Malemba ◽  
...  
Keyword(s):  
Speed Of Sound ◽  
Central Africa ◽  
Cross Sectional Study ◽  
Mean Value ◽  
Hormonal Status ◽  
Reference Curve ◽  
Cross Sectional ◽  
Polynomial Curve ◽  
Republic Of The Congo ◽  
Growth Feature

<p><em>Background: Osteodensitometry, a procedure increasingly accepted by clinicians to access osteoporosis is not yet fully validated by WHO. It requires the establishment of normal values and references curves for each population, and in our community, this is not yet assessed.</em></p><p><em>The purpose of this study was twofold: to describe the profile of the speed of sound of proximal phalangeal metaphysis and establish references curves in central Africans and to compare them with those of other populations specially Caucasians.</em></p><p><em>Methods: This cross sectional study was carried out at Kinshasa, Democratic Republic of the Congo in Central Africa from January to December 2016.</em></p><p><em>Four hundred twenty four subjects aged from 20 to 87 years old, were explored and the speed of sound in theirs proximal phalanges measured using ultrasound equipment. Age, gender, hormonal status and speed of sound were collected and analyzed.</em></p><p><em>Results: The mean value of the amplitude dependant speed of sound (AD-SoS) showed a growth feature with age (from 2056 m/sec at second decade of life to 2145.27 m/sec at fourth decade followed by a progressive decrease which was present in both sexes but more marked in postmenopausal women (1927.06 m/sec). This mean value was higher than in Caucasian studies. In this study, age and hormonal status seems to be the bone quality most influencing anthropometric factors as seen in many series.</em></p><p><em>The curve profile with age was also a polynomial curve as seen in others populations of the world.</em></p><p><em>Conclusion: This study provides normal data for phalangeal ultrasound measurements and reference curve of central Africans which were compared to those of Western studies.</em></p>

On-Machine Metrology System Using Confocal Chromatic Probe and Motion Error Correction for Ultra-Precision Machine Tool

2020 ◽  
Author(s):  
Hao Duan ◽  
Shinya Morita ◽  
Takuya Hosobata ◽  
Masahiro Takeda ◽  
Yutaka Yamagata
Keyword(s):  
Machine Tool ◽  
Free Form ◽  
Reference Curve ◽  
Optical Surface ◽  
Motion Error ◽  
Precision Machine ◽  
Ultra Precision ◽  
Axis Position ◽  
Form Deviation ◽  
Accuracy And Repeatability

Abstract Aspherical or free-form optical surface machining using an ultra-precision machine tool is a common and effective method in precision optics manufacturing. However, this method sometimes causes waviness due to the machine’s motion in mid-spatial frequency (MSF) form deviations. This waviness lowers the quality of the optical surface. To address this problem, we use the waviness of the axial displacement of the ultra-precision machine tool. The waviness is obtained by a non-contact on-machine metrology (OMM) system that measures an optical flat as a correction reference curve, which is used to correct the surface of the workpiece to reduce the effect of waviness in advance. The OMM system consists of a displacement probe and a machine tool axis position capture device. The probe system uses a confocal chromatic probe on an ultra-precision machine tool to evaluate the form deviation of the workpiece with 1 nm resolution. The axis position capture system uses a signal branch circuit of linear scale on each axis from the ultra-precision machine tool. The OMM system is tested in terms of accuracy and repeatability. In comparison to the results of the shaper cutting of an oxygen-free copper (OFC) workpiece with feed-forward correction, we were able to reduce the profile error from 125.3 nm to 42.1 nm in p-v (peak to valley) and eventually also reduced the waviness.

Performance of a local reference curve for predicting small for gestational age fetuses in pregnant women with HIV / AIDS

2020 ◽  
Author(s):  
Daniel Massamatsu Pianovski Kato ◽  
Liziane Lorusso ◽  
Rafael Frederico Bruns ◽  
Elisa Chicareli Pinhat ◽  
Natália Roberta Andrade Dalla Costa ◽  
...  
Keyword(s):  
Pregnant Women ◽  
Gestational Age ◽  
Small For Gestational Age ◽  
Reference Curve ◽  
Local Reference ◽  
Women With Hiv ◽  
Hiv Aids

Fatigue Crack Growth Curve for Austenitic Stainless Steels in PWR Environment

2004 ◽  
Author(s):  
Yuichiro Nomura ◽  
Kazuya Tsutsumi ◽  
Hiroshi Kanasaki ◽  
Naoki Chigusa ◽  
Kazuhiro Jotaki ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Growth Curve ◽  
Stainless Steels ◽  
Austenitic Stainless Steels ◽  
Stress Intensity Factor Range ◽  
Reference Curve ◽  
Pressurized Water ◽  
Crack Growth Curve

Although reference fatigue crack growth curves for austenitic stainless steels in air environments and boiling water reactor (BWR) environments were prescribed in JSME S NA1-2002, similar curves for pressurized water reactors (PWR) were not prescribed. In order to propose the reference curve in PWR environment, fatigue tests of austenitic stainless steels in simulated PWR primary water environment were carried out. According to the procedure to determine the reference fatigue crack growth curve of BWR, which of PWR is proposed. The reference fatigue crack growth curve in PWR environment have been determines as a function of stress intensity factor range, Temperature, load rising time and stress ratio.

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