Experimental data of the aqueous NH3and CO2absorption at temperatures from 15 °C to 35 °C, NH3concentrations from 5% to 15% and CO2 loadings from 0.2 to 0.6 measured with the Wetted Wall Column

The absorption between aqueous NH3and CO2is studied using the Wetted Wall Column in order to show the effect of the solvent condition on the rate of reaction. A total of 27 different cases are investigated in the region defined by temperatures from 15 °C to 35 °C, NH3concentrations from 5% to 15% and CO2loadings from 0.2 to 0.6. The paper reports the data measured during the experiments, the experimental apparatus description and the experimental procedure. The data here presented are both the raw data measured with their uncertainty and the final value of the overall mass transfer coefficient. The overall mass transfer coefficient is the result of the raw data treatment explained in the research paper related to this data. The data here reported are analyzed in the paper by Lillia et al. (2018) [1]

Low immediate scientific yield of the PhD among medical doctors

BACKGROUND: We studied the scientific yield of the medical PhD program at all Danish Universities. METHODS: We undertook a retrospective observational study. Three PhD schools in Denmark were included in order to evaluate the postdoctoral research production over more than 18 years through individual publications accessed by PubMed. RESULTS: A total of 2686 PhD-graduates (1995–2013) with a medical background were included according to registries from all PhD schools in Denmark. They had a median age of 35 years (interquartile range (IQR), 32–38) and 53 % were women at the time of graduation. Scientific activity over time was assessed independently of author-rank and inactivity was measured relative to the date of graduation. Factors associated with inactivity were identified using multivariable logistic regression. 88.6 % of the PhD theses were conducted in internal medicine vs. 11.4 % in surgery. During follow-up (median 6.9 years, IQR 3.0–11.7), PubMed data searches identified that 87 (3.4 %) of the PhD graduates had no publication after they graduated from the PhD program, 40 % had 5 or less, and 90 % had 30 or less. The median number of publications per year after PhD graduation was 1.12 (IQR 0.61–1.99) papers per year. About 2/3 of the graduates became inactive after 1 year and approximately 21 % of the graduates remained active during the whole follow-up. Female gender was associated with inactivity: adjusted odds ratio 1.59 (95 % confidence interval 1.24–2.05). CONCLUSIONS: The scientific production of Danish medic PhD-graduates was mainly produced around the time of PhD-graduation. After obtaining the PhD-degree the scientific production declines suggesting that scientific advance fails and resources are not harnessed

Differential changes in serum uric acid concentrations in sibutramine promoted weight loss in diabetes: results from four weeks of the lead-in period of the SCOUT trial

<p>Abstract</p> <p>Background and aims</p> <p>Elevated levels of serum uric acid are associated with an increased risk of cardiovascular morbidity and mortality. The response of uric acid to weight loss therapy (lifestyle plus sibutramine) in an overweight and obese cardiovascular high risk population was studied.</p> <p>Methods and results</p> <p>Data from a four week single-blind lead-in period of the Sibutramine Cardiovascular OUTcomes (SCOUT) study were analyzed. 2584 patients (24%) had diabetes mellitus (DM) only, 1748 (16%) had cardiovascular disease (CVD) only and 6397 (60%) had both DM + CVD. Uric acid concentrations (mean ± standard deviation) at screening were significantly higher among patients with CVD compared to patients without CVD (p < 0.0001): 369 ± 86 μmol/L, 374 ± 98 μmol/L and 342 ± 87 μmol/L in CVD only, CVD+DM and DM only groups, respectively. During treatment uric acid decreased significantly more in patients without DM (p < 0.0001): -15.0 μmol/L (95% confidence interval -17.7;-12.4), -4.6 μmol/L (-6.2;-3.0), and -6.6 μmol/L (-8.7;-4.5) in CVD only, CVD+DM, and DM only groups, respectively. In patients who failed to lose weight, sibutramine induced lower uric acid levels, but greater weight loss and diabetes were associated with smaller falls in blood uric acid levels; decreasing fasting and urinary glucose concentrations in diabetes were associated with increases in uric acid levels.</p> <p>Conclusion</p> <p>A four week daily intake of sibutramine and life style changes was associated with significant reductions in mean uric acid levels. Changes in renal glucose load in diabetes seem to counteract a potential uricosuric effect of sibutramine.</p> <p>Trial Registration</p> <p>The trial is registered at ClinicalTrial.gov number: NCT00234832.</p

Synthesis Properties of Feco3: Understanding the Underground Reactive Rock

Combatting anthropogenic CO2 emissions is one of the humanities considerable challenges, and carbon capture and storage (CCS) technologies are one of the tools that has been proposed for this. FeCO3 is attracting attention as it has been proposed to be a potential storage unit for CO2 injection in underground basaltic rock. Through mineral carbonation, dissolved CO2 reacts with underground reactive divalent metal-containing rock. However, the properties of FeCO3 is not well understood, and optimal permanent storage hinges on knowledge of the properties of the reactive species. We investigate the influence of synthesis parameters through a variation study, such as temperature, synthesis duration, and pressure. We then investigate the material properties, where the crystal structure and crystalline domains size is examined through XRD, thermal degradation stability with TGA and particle size with SEM. Through this investigation, a fundamental understanding of FeCO3 was gained, which will enhance the understanding of underground storage in reactive basaltic rock.publishedVersio

CO2 Impact on FeCO3 Corrosion Product

Reduction of the emissions of CO2 and other greenhouse gases is a global challenge. Carbon capture and storage (CCS) is one of the most ready to use technologies applicable for industries such as biogas upgrading, cement, and in general, gas cleaning. Even though the technology is mature, optimization is still needed to reduce costly production losses and shutdowns. CO2 corrosion is a significant problem in the industry, and therefore, fundamental information regarding the corrosion product, FeCO3, is needed. FeCO3 creates a protective barrier on the steel surface under the right conditions, and therefore information on the solubility is important. In this study, the solubility of FeCO3 in water and under the influence of CO2 is investigated. Results revealed that the FeCO3 solubility in water (with and without the presence of CO2) is constant with temperature. A global maximum in the FeCO3 solubility was seen when increasing CO2 pressure. This phenomenon is not seen in the typical carbonate systems.publishedVersio

Extended UNIQUAC Thermodynamic Modeling of Aqueous Two-Phase Systems, Water + Salt + Short-Chain Alcohol

The extended UNIQUAC activity coefficient model for electrolyte solutions was used for simulating the water + short-chain alcohol (1-propanol, 2-propanol, and tert-butanol) + salt (NaCl, KCl, NH4Cl, Na2SO4, and K2SO4) systems in a wide temperature range (0–100 °C). Experimental data were used for determining the interaction parameters (water + alcohol and alcohol + ion) and the volume and surface area parameters. Parameters for water + ion interactions were taken from previous publications. Equilibrium calculations including SLLV, SLL, SLV, LLV, LV, SV, and SL were performed with the model. The results are largely in agreement with those obtained experimentally. Model parameters previously published for these systems were revised based on new data