scholarly journals Power-to-Gas: Analysis of potential decarbonization of Spanish electrical system in long-term prospective

Energy ◽  
2018 ◽  
Vol 159 ◽  
pp. 656-668 ◽  
Author(s):  
Pilar Lisbona ◽  
Guido Francesco Frate ◽  
Manuel Bailera ◽  
Umberto Desideri
Keyword(s):  
Gas Analysis ◽  
Electrical System ◽  
Power To Gas

scholarly journals Quantitative effects of environmental variation on stomatal anatomy and gas exchange in a grass model

2021 ◽  
Author(s):  
Tiago DG Nunes ◽  
Magdalena W Slawinska ◽  
Heike Lindner ◽  
Michael T Raissig
Keyword(s):  
Gas Exchange ◽  
Anatomical Variation ◽  
Brachypodium Distachyon ◽  
Carbon Assimilation ◽  
Light Response ◽  
Gas Analysis ◽  
Environmental Signals ◽  
Grass Model ◽  
Kinetics Of

Stomata are cellular pores on the leaf epidermis that allow plants to regulate carbon assimilation and water loss. Stomata integrate environmental signals to regulate pore apertures and optimize gas exchange to fluctuating conditions. Here, we quantified intraspecific plasticity of stomatal gas exchange and anatomy in response to seasonal variation in Brachypodium distachyon. Over the course of two years we (i) used infrared gas analysis to assess light response kinetics of 120 Bd21-3 wild-type individuals in an environmentally fluctuating greenhouse and (ii) microscopically determined the seasonal variability of stomatal anatomy in a subset of these plants. We observed systemic environmental effects on gas exchange measurements and remarkable intraspecific plasticity of stomatal anatomical traits. To reliably link anatomical variation to gas exchange, we adjusted anatomical gsmax calculations for grass stomatal morphology. We propose that systemic effects and variability in stomatal anatomy should be accounted for in long-term gas exchange studies.

scholarly journals Heart valve injury due to radiation therapy

Kardiologiia ◽  
2019 ◽  
Vol 59 (2S) ◽  
pp. 56-68
Author(s):  
M. G. Poltavskaya ◽  
E. I. Emelina ◽  
Yu. V. Avdeev ◽  
G. E. Gendlin ◽  
G. N. Paramonova
Keyword(s):  
Radiation Therapy ◽  
Heart Valves ◽  
Single Photon ◽  
Stress Test ◽  
Gas Analysis ◽  
Long Term Results ◽  
Cardiovascular Pathology ◽  
Results Of Treatment ◽  
Clinically Significant

Relevance.Radiation therapy (RT) plays an important role in oncology, improving the immediate and long-term results of treatment of a number of tumors. One of the most significant complications of RT are lesions of the heart valves.Objective.To study the variants of valve damage that occur in patients who received radiation therapy for cancer.Patients and methods.A group of patients who, during the period from 1978 to 2002, underwent chemo-radiation therapy (CRT) for Hodgkin's lymphoma (LH) of 2–4 stages with damage to the intrathoracic lymph nodes: 71 patients, 60 of whom did not go to the cardiologist and were invited to be examined, 11 were hospitalized due to clinically significant cardiovascular pathology (CHF, myocardial infarction, angina pectoris, valvular defect, AV block). The study methods included: standard clinical and laboratory examination, spirometry, 24‑hour ECG monitoring, echocardiography, in some patients single-photon myocardial emission tomoscintigraphy (SPECT), and CT scan of the chest organs. In 60 patients, a stress test on an ECG-controlled treadmill was performed, in 18 patients – a maximum stress test on a treadmill with a gas analysis – ergospirometry.Results and discussion. Valve pathology was detected in 49.3 % of cases, most often (in 46.5 %) mitral regurgitation (MR) occurred, primarily due to MR of the 1 st degree, which had no clinical significance. Pathology of the aortic valve (12.7 % of patients) was represented mainly by mild regurgitation (11.3 %). Aortic stenosis was diagnosed in 4.2 % of patients. In the studied cohort of patients, predominantly non-severe valve lesions were detected. In addition, examples of patients with clinically significant valve valvular lesions are presented.

Modelling the integrated power and transport energy system: The role of power-to-gas and hydrogen in long-term scenarios for Italy

Energy ◽  
2018 ◽  
Vol 154 ◽  
pp. 592-601 ◽  
Author(s):  
Paolo Colbertaldo ◽  
Giulio Guandalini ◽  
Stefano Campanari
Keyword(s):  
Energy System ◽  
Power To Gas

Long term stability of dynamic reference systems for NO2 atmospheric monitoring

2021 ◽  
Author(s):  
Edgar Flores ◽  
Faraz Idrees ◽  
Philippe Moussay ◽  
Robert I. Wielgosz
Keyword(s):  
International Comparisons ◽  
Reference Value ◽  
Gas Analysis ◽  
Decay Rates ◽  
Reference Systems ◽  
Initial Comparison ◽  
Fit For Purpose ◽  
Gas Standards ◽  
Stability And Accuracy

<p>The long-term monitoring of reactive gases, such as NO<sub>2</sub>, provides significant challenges for the development of gas standards that can demonstrate fit-for-purpose stability and accuracy.  Over the last fifteen years the BIPM’s primary gas facility for the dynamic production of mixtures of nitrogen dioxide in nitrogen, operating over the range (1 μmol/mol to 15 μmol/mol) has been shown to operate with a relative standards uncertainty of 0.4%. The system is based on continuous weighing of a permeation tube and on the accurate impurity quantification and correction of the gas mixtures using FT-IR.</p><p>The operation of the system has been demonstrated in two international comparisons organized by the CCQM Working Group on Gas Analysis (CCQM-GAWG), in 2009 and 2018, with the former demonstrating the requirement to correct for HNO<sub>3</sub> impurities in gas standards produced in cylinders, and the more recent, the potential for non-linear decay in NO<sub>2</sub> concentration in gas cylinder standards in the first 100 to 150 days following their production.</p><p>The CCQM-K74 (2009/2010) was organized, with all cylinders prepared by the one NMI (VSL) with the same surface treatment and characterized for stability and with reference values provided by the BIPM dynamic reference facility. The initial comparison identified small decay rates in the circulated standards, accounted for by the addition of an uncertainty to the reference value, and calculated to have been no more than 0.1 nmol/mol per day loss of NO<sub>2</sub>. However, the 2009 comparison did not examine standards maintained by individual participating institutes directly. The protocol of the CCQM-K74.2018 comparison, was modified so that the standards prepared by participating institutes (two per participant), were all directly measured at the BIPM against its dynamic reference facility. The modified protocol, although technically more challenging, has allowed the different decay rates in different cylinder preparations from different institutes to be identified, as well as the time dependence of these days rates.</p><p>The work has highlighted the challenges in NO<sub>2</sub> standard development, and that fit-for-purpose standards can be obtained following appropriate protocols. Further development of these protocols is the focus of a number of research programmes, for example  METNO2 and MetroPEMS projects within the EMPIR programmes. Further activities at the BIPM facility are focused on validating the performance of NO<sub>2</sub> dynamic reference systems below 1 μmol/mol and into the nmol/mol range, with the comparison of different dynamic reference systems, in support of future international comparisons and knowledge transfer activities.</p>

Surgical Retrieval of a Transected Umbilical Artery Catheter

2007 ◽  
Vol 26 (2) ◽  
pp. 133-134 ◽  
Author(s):  
Roderick Thomas Mitchell ◽  
Richard Thompson ◽  
Sumesh Thomas
Keyword(s):  
Umbilical Artery ◽  
Blood Pressure Monitoring ◽  
Blood Gas Analysis ◽  
Operative Management ◽  
Premature Baby ◽  
Gas Analysis ◽  
Pressure Monitoring ◽  
Arterial Circulation ◽  
Premature Babies

UMBILICAL ARTERY catheters (UACs) are commonly used in neonates and particularly in premature babies. They are crucial in enabling accurate blood pressure monitoring, blood gas analysis, and blood sampling. There is a relatively low rate of major complications with these catheters; however, complications may result from fracture or transection of the catheter.1,2Complications of retained UACs include hemorrhage and thromboembolic events. Long-term sequelae have also been described, including limb abnormalities as a result of ischemia and recurrent umbilical infection following unrecognized retained UACs.2,3We report a case of accidental transection of a UAC and subsequent migration of the catheter into the arterial circulation. This resulted in the premature baby requiring a laparotomy to retrieve the catheter. We describe the events leading to the transection, present its operative management, and offer suggestions for preventing this complication.

Study on the Relationship between Total Hydrocarbon and Gases Dissolved in Transformer Oil

2014 ◽  
Vol 556-562 ◽  
pp. 502-506
Author(s):  
Yi Chen ◽  
Bin Song
Keyword(s):  
Carbon Monoxide ◽  
Correlation Coefficient ◽  
Pearson Correlation ◽  
Gas Analysis ◽  
Transformer Oil ◽  
Pearson Correlation Coefficient ◽  
Dissolved Gas ◽  
Total Hydrocarbon ◽  
The Relationship

Dissolved gas analysis (DGA) in transformer oil is considered as one of the preferred projects to discover the potential faults of the transformer. To identify the aging characteristics of oil-immersed transformer oil in long-term operations, it is important to study relationship between total hydrocarbon and gases dissolved in transformer oil. This paper used Pearson correlation coefficient to analyze the relationship with the data of DGA. At last, it gives the result that the correlations between the total hydrocarbon and carbon monoxide, methane, ethane, ethylene, acetylene was positive. Therefore, this study lays the foundation which help to diagnose the aging status of transformer.

Transcutaneous Po2 Monitoring in Routine Management of Infants and Children With Cardiorespiratory Problems

PEDIATRICS ◽  
1976 ◽  
Vol 57 (5) ◽  
pp. 681-690
Author(s):  
R. Huch ◽  
A. Huch ◽  
M. Albani ◽  
M. Gabriel ◽  
F. J. Schulte ◽  
...  
Keyword(s):  
Intensive Care ◽  
Pediatric Intensive Care ◽  
Blood Gas Analysis ◽  
Gas Analysis ◽  
Blood Gas ◽  
Close Correspondence ◽  
Arterial Po2 ◽  
Transcutaneous Po2 ◽  
Made In

Results are reported concerning the clinical application of the transcutaneous Po2 method (tc Po2 method) according to Huch et al. for monitoring arterial Po2. Thirty long-term continuous tc Po2 recordings were made in 22 ventilated children and infants with cardiorespiratory problems in four different pediatric intensive care units (Zürich, Göttingen, Kassel, and Mainz). These recordings were compared with 132 arterial Po2 determinations made during the same period of time. There was a linear relationship and a close correspondence between arterial Po2 and tc Po2 (r = .94). The continuous recordings have shown that the variability of Po2 is much greater than assumed so far by single blood gas analysis. This fact restricts greatly the value of single samples. Continuous tc Po2 monitoring has proved to be a great help in optimal respirator setting.

Sign in / Sign up

Export Citation Format

Share Document