29 research outputs found
Femtosecond Covariance Spectroscopy
The success of non-linear optics relies largely on pulse-to-pulse
consistency. In contrast, covariance based techniques used in photoionization
electron spectroscopy and mass spectrometry have shown that wealth of
information can be extracted from noise that is lost when averaging multiple
measurements. Here, we apply covariance based detection to nonlinear optical
spectroscopy, and show that noise in a femtosecond laser is not necessarily a
liability to be mitigated, but can act as a unique and powerful asset. As a
proof of principle we apply this approach to the process of stimulated Raman
scattering in alpha-quartz. Our results demonstrate how nonlinear processes in
the sample can encode correlations between the spectral components of
ultrashort pulses with uncorrelated stochastic fluctuations. This in turn
provides richer information compared to the standard non-linear optics
techniques that are based on averages over many repetitions with well-behaved
laser pulses. These proof-of-principle results suggest that covariance based
nonlinear spectroscopy will improve the applicability of fs non-linear
spectroscopy in wavelength ranges where stable, transform limited pulses are
not available such as, for example, x-ray free electron lasers which naturally
have spectrally noisy pulses ideally suited for this approach
Assessment of a continuous blood gas monitoring system in animals during circulatory stress
<p>Abstract</p> <p>Background</p> <p>The study was aimed to determine the measurement accuracy of The CDI⢠blood parameter monitoring system 500 (Terumo Cardiovascular Systems Corporation, Ann Arbor MI) in the real-time continuous measurement of arterial blood gases under different cardiocirculatory stress conditions</p> <p>Methods</p> <p>Inotropic stimulation (Dobutamine 2.5 and 5 Οg/kg/min), vasoconstriction (Arginine-vasopressin 4, 8 and 16 IU/h), hemorrhage (-10%, -20%, -35%, and -50% of the theoretical volemia), and volume resuscitation were induced in ten swine (57.4 ¹ 10.7 Kg).Intermittent blood gas assessments were carried out using a routine gas analyzer at any experimental phase and compared with values obtained at the same time settings during continuous monitoring with CDI⢠500 system. The Bland-Altman analysis was employed.</p> <p>Results</p> <p>Bias and precision for pO<sub>2 </sub>were - 0.06 kPa and 0.22 kPa, respectively (r<sup>2 </sup>= 0.96); pCO<sub>2 </sub>- 0.02 kPa and 0.15 kPa, respectively; pH -0.001 and 0.01 units, respectively ( r<sup>2 </sup>= 0.96). The analysis showed very good agreement for SO<sub>2 </sub>(bias 0.04,precision 0.33, r<sup>2 </sup>= 0.95), Base excess (bias 0.04,precision 0.28, r<sup>2 </sup>= 0.98), HCO<sub>3 </sub>(bias 0.05,precision 0.62, r<sup>2 </sup>= 0.92),hemoglobin (bias 0.02,precision 0.23, r<sup>2 </sup>= 0.96) and K<sup>+ </sup>(bias 0.02, precision 0.27, r<sup>2 </sup>= 0.93). The sensor was reliable throughout the experiment during hemodynamic variations.</p> <p>Conclusions</p> <p>Continuous blood gas analysis with the CDI⢠500 system was reliable and it might represent a new useful tool to accurately and timely monitor gas exchange in critically ill patients. Nonetheless, our findings need to be confirmed by larger studies to prove its reliability in the clinical setting.</p
Wayforlight : the Catalogue of European light sources
Wayforlight.eu is the gateway to find-ing the most suitable instruments for experiments with synchrotron, FEL, and laser light sources. The portal's main asset is a de-tailed searchable catalogue of facilities, beam-lines, and instrumentation available at Euro-pean light sources. Thanks to its advanced search tools, a visitor can filter beamlines by scientific discipline, by technique, but also by energy range or sample type
A 0.25-¾m CMOS, 7-ppm/°C, 8-¾A Quiescent Current, 5-mA Output Current Low-Dropout Voltage Regulator
Monitoring dynamic electrochemical processes with in situ ptychography
he present work reports novel soft X-ray Fresnel CDI ptychography results, demonstrating the potential of this method for dynamic in situ studies. Specifically, in situ ptychography experiments explored the electrochemical fabrication of Co-doped Mn-oxide/polypyrrole nanocomposites for sustainable and cost-effective fuel-cell air-electrodes. Oxygen-reduction catalysts based on Mn-oxides exhibit relatively high activity, but poor durability: doping with Co has been shown to improve both reduction rate and stability
Refining scan positions in Ptychography through error minimisation and potential application of Machine Learning
Rib plating of acute and sub-acute non-union rib fractures in an adult with cystic fibrosis: a case report
XRF topography information: Simulations and data from a novel silicon drift detector system
none22siThis work presents the latest findings of an ongoing research project where the angular dependence of XRF detection could be exploited for the topographical study of the specimen. It presents the results of a simulation framework and of measurements performed with a new detector system deployed on the TwinMic beamline (Elettra Sincrotrone Trieste, Trieste, Italy).noneKourousias, G.; Billè, F.; Cautero, G.; Bufon, J.; Rachevski, A.; Schillani, S.; Cirrincione, D.; Altissimo, M.; Menk, R.H.; Zampa, G.; Zampa, N.; Rashevskaya, I.; Borghes, R.; Gandola, M.; Picciotto, A.; Borghi, G.; Ficorella, F.; Zorzi, N.; Bellutti, P.; Bertuccio, G.; Vacchi, A.; Gianoncelli, A.Kourousias, G.; Billè, F.; Cautero, G.; Bufon, J.; Rachevski, A.; Schillani, S.; Cirrincione, D.; Altissimo, M.; Menk, R. H.; Zampa, G.; Zampa, N.; Rashevskaya, I.; Borghes, R.; Gandola, M.; Picciotto, A.; Borghi, G.; Ficorella, F.; Zorzi, N.; Bellutti, P.; Bertuccio, G.; Vacchi, A.; Gianoncelli, A