Theoretical and experimental studies of high-resolution inverse Raman spectra of molecular nitrogen at 1-10 atm

1987 ◽  
Vol 91 (1) ◽  
pp. 41-46 ◽  
Author(s):  
M. L. Koszykowski ◽  
L. A. Rahn ◽  
R. E. Palmer ◽  
M. E. Coltrin
Keyword(s):  
High Resolution ◽  
Raman Spectra ◽  
Molecular Nitrogen ◽  
Experimental Studies

Laser interstitial thermotherapy (LITT) monitoring using high-resolution digital mammography: theory and experimental studies

2002 ◽  
Vol 47 (16) ◽  
pp. 2987-2999 ◽  
Author(s):  
Ahmed M Minhaj ◽  
Fabrice Manns ◽  
Peter J Milne ◽  
David B Denham ◽  
Nelson Salas Jr ◽  
...  
Keyword(s):  
High Resolution ◽  
Digital Mammography ◽  
Experimental Studies ◽  
Interstitial Thermotherapy

scholarly journals Photoionization Cross-Sections of Carbon-Like N+ Near the K-Edge (390–440 eV)

Atoms ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 27
Author(s):  
Jean-Paul Mosnier ◽  
Eugene T. Kennedy ◽  
Jean-Marc Bizau ◽  
Denis Cubaynes ◽  
Ségolène Guilbaud ◽  
...  
Keyword(s):  
High Resolution ◽  
Cross Section ◽  
Cross Sections ◽  
Experimental Studies ◽  
Photoionization Cross Section ◽  
Theoretical Work ◽  
Rydberg Series ◽  
R Matrix ◽  
Resonance Strengths ◽  
Nitrogen Ion

High-resolution K-shell photoionization cross-sections for the C-like atomic nitrogen ion (N+) are reported in the 398 eV (31.15 Å) to 450 eV (27.55 Å) energy (wavelength) range. The results were obtained from absolute ion-yield measurements using the SOLEIL synchrotron radiation facility for spectral bandpasses of 65 meV or 250 meV. In the photon energy region 398–403 eV, 1s⟶2p autoionizing resonance states dominated the cross section spectrum. Analyses of the experimental profiles yielded resonance strengths and Auger widths. In the 415–440 eV photon region 1s⟶(1s2s22p2 4P)np and 1s⟶(1s2s22p2 2P)np resonances forming well-developed Rydberg series up n=7 and n=8 , respectively, were identified in both the single and double ionization spectra. Theoretical photoionization cross-section calculations, performed using the R-matrix plus pseudo-states (RMPS) method and the multiconfiguration Dirac-Fock (MCDF) approach were bench marked against these high-resolution experimental results. Comparison of the state-of-the-art theoretical work with the experimental studies allowed the identification of new resonance features. Resonance strengths, energies and Auger widths (where available) are compared quantitatively with the theoretical values. Contributions from excited metastable states of the N+ ions were carefully considered throughout.

HIGH RESOLUTION RAMAN SPECTROSCOPY OF GASES: I. EXPERIMENTAL METHODS

1954 ◽  
Vol 32 (5) ◽  
pp. 330-338 ◽  
Author(s):  
B. P. Stoicheff
Keyword(s):  
Raman Spectroscopy ◽  
High Resolution ◽  
Magnesium Oxide ◽  
Raman Spectra ◽  
Experimental Methods ◽  
Resolving Power ◽  
Polar Molecules ◽  
High Current ◽  
Rotational Constants ◽  
Moments Of Inertia

An apparatus for obtaining intense Raman spectra of gases excited by the Hg 4358 line is described. It consists of a mirror-type Raman tube irradiated by two high-current mercury lamps, completely enclosed in a reflector of magnesium oxide. The lamps are externally water-cooled along their entire length and emit sharp lines of high intensity.Rotational Raman spectra of gases at a pressure of 1 atm. have been photographed in the second order of a 21 ft. grating in exposure times of 6 to 24 hr. The Raman lines are sharp and a resolving power of about 100,000 has been achieved. It will be possible to resolve the rotational Raman spectra, and hence to evaluate the rotational constants of molecules having moments of inertia of up to 300 × 10−10 gm. cm.2 Such investigations will be especially useful for non-polar molecules.

scholarly journals A low-cost, human-like, high-resolution, tactile sensor based on optical fibers and an image sensor

2018 ◽  
Vol 15 (4) ◽  
pp. 172988141878363 ◽  
Author(s):  
Utku Büyükşahin ◽  
Ahmet Kırlı
Keyword(s):  
High Resolution ◽  
Spatial Resolution ◽  
Fiber Optic ◽  
Low Cost ◽  
Experimental Studies ◽  
Main Idea ◽  
Tactile Sensor ◽  
Image Sensor ◽  
Sensor Design ◽  
Tactile Sensors

Tactile sensors are commonly a coordinated group of receptors forming a matrix array meant to measure force or pressure similar to the human skin. Optic-based tactile sensors are flexible, sensitive, and fast; however, the human fingertip’s spatial resolution, which can be regarded as the desired spatial resolution, still could not be reached because of their bulky nature. This article proposes a novel and patented optic-based tactile sensor design, in which fiber optic cables are used to increase the number of sensory receptors per square centimeter. The proposed human-like high-resolution tactile sensor design is based on simple optics and image processing techniques, and it enables high spatial resolution and easy data acquisition at low cost. This design proposes using the change in the intesity of the light occured due to the deformation on contact/measurement surface. The main idea is using fiber optic cables as the afferents of the human physiology which can have 9 µm diameters for both delivering and receiving light beams. The variation of the light intensity enters sequent mathematical models as the input, then, the displacement, the force, and the pressure data are evaluated as the outputs. A prototype tactile sensor is manufactured with 1-mm spatial and 0.61-kPa pressure measurement resolution with 0–15.6 N/cm2 at 30 Hz sampling frequency. Experimental studies with different scenarios are conducted to demonstrate how this state-of-the-art design worked and to evaluate its performance. The overall accuracy of the first prototype, based on different scenarios, is calculated as 93%. This performance is regarded as promising for further developments and applications such as grasp control or haptics.

scholarly journals Probing the structure of giant fullerenes by high resolution trapped ion mobility spectrometry

2019 ◽  
Vol 21 (35) ◽  
pp. 18877-18892 ◽  
Author(s):  
Patrick Weis ◽  
Frank Hennrich ◽  
Regina Fischer ◽  
Erik K. Schneider ◽  
Marco Neumaier ◽  
...  
Keyword(s):  
High Resolution ◽  
Ion Mobility Spectrometry ◽  
Ion Mobility ◽  
Molecular Nitrogen ◽  
Trapped Ion ◽  
Trapped Ion Mobility Spectrometry

We present high-resolution trapped ion mobility spectrometry (TIMS) measurements for fullerene ions in molecular nitrogen.

Experimental studies on few-view reconstruction for high-resolution micro-CT

2013 ◽  
Vol 21 (1) ◽  
pp. 25-42 ◽  
Author(s):  
Kriti Sen Sharma ◽  
Xin Jin ◽  
Christian Holzner ◽  
Shree Narayanan ◽  
Baodong Liu ◽  
...  
Keyword(s):  
High Resolution ◽  
Experimental Studies ◽  
Micro Ct ◽  
View Reconstruction

scholarly journals Dynamic Penumbra Demonstrated by Sequential Multitracer PET after Middle Cerebral Artery Occlusion in Cats

1994 ◽  
Vol 14 (6) ◽  
pp. 892-902 ◽  
Author(s):  
W.-D. Heiss ◽  
R. Graf ◽  
K. Wienhard ◽  
J. Löttgen ◽  
R. Saito ◽  
...  
Keyword(s):  
High Resolution ◽  
Middle Cerebral Artery ◽  
Cerebral Artery ◽  
Focal Cerebral Ischemia ◽  
Control Level ◽  
Experimental Studies ◽  
Arterial Occlusion ◽  
Oxygen Extraction Fraction ◽  
Mca Occlusion ◽  
Border Zones

Experimental models of focal cerebral ischemia have provided important data on early circulatory and biochemical changes, but typically their correspondence with metabolic and hemodynamic findings in stroke patients has been poor. To fill the gap between experimental studies at early time points and rather late clinical studies, we repeatedly measured CBF, CMRO2, oxygen extraction fraction (OEF), cerebral blood volume (CBV), and CMRglc in six cats before and up to 24 h after permanent middle cerebral artery (MCA) occlusion (MCAO), using the 15O steady state and [18F]fluorodeoxyglucose methods and a high-resolution positron emission tomography (PET) scanner. Likewise, three sham-operated control cats were studied during the same period. Final infarct size was determined on serial histologic sections. In the areas of final glucose metabolic depression that were slightly larger than the histologic infarcts, mean CBF dropped to ∼40% of control values immediately on arterial occlusion. It further decreased to <20% during the course of the experiment. This progressive ischemia was most conspicuous in border zones. CMRO2 fell to a lesser degree (55%), eventually reaching ∼25% of its control level. At early stages, OEF increased mainly in the center of ischemia. With time, areas of increased OEF moved from the center to the periphery of the MCA territory. Concurrently, progressive secondary decreases in OEF in conjunction with further reductions of CBF and CMRO2 indicated the development of central necrosis. The findings are highly suggestive of a dynamic penumbra. In five cats with complete MCA infarcts, CBF decreased and OEF increased in the contralateral hemisphere after 24 h, suggesting whole-brain damage. This effect may be explained by the widespread brain edema found histologically in addition to the nonspecific CBF reductions and OEF elevations observed also in the sham-operated controls after 1 day in the experimental condition. In one cat, cortical OEF increased only transiently. Normal CMRO2 and CMRglc were eventually restored, and the final infarct was small. This study demonstrates that acute regional pathophysiologic changes can be repeatedly assessed by multivariate PET in cats. Viable tissue can be detected up to several hours after MCA occlusion, and the transition of misery-perfused regions into necrosis or preserved tissue can be followed over time. The present results support the concept of a dynamic penumbra, in which for up to 24 h tissue damage spreads progressively from the center to the periphery of ischemia. Sequential high-resolution PET provides insight into the dynamics of regional pathophysiology and may thus further the development of rational therapeutic strategies.

scholarly journals High-Resolution Infrared and Raman Spectra of the Polycrystalline Sinomenine Hydrochloride

2016 ◽  
Vol 67 ◽  
pp. 03025
Author(s):  
Xiao-Dong Liu ◽  
Lu Liu ◽  
Sen Gao ◽  
Hua-Mao Meng ◽  
Wen Zhang
Keyword(s):  
High Resolution ◽  
Raman Spectra ◽  
Infrared And Raman Spectra ◽  
Sinomenine Hydrochloride
Sign in / Sign up

Export Citation Format

Share Document