Spectrophotometric Determination of Stability Constants of Lactato and B-Hydroxypropionato Complexes of Cobalt(ll), Nickel(II), and Copper(II)

Stability constants for lactato and B-hydroxypropionato complexes of Co(II), Ni(II), and Cu(II) were obtained from spectrophotometric data, using Bjerrum\u27s method of corresponding solutions. Measurements were made in the visible range and the results plotted for graphical evaluation by Fronaeus\u27 method. Graphically determined values for each stability constant were utilized for averaging and least-squares calculations with a digital computer programmed according to R. S. Tobias (»Gauss Z« program)

Spectrophotometric Determination of Stability Constants of Lactato and B-Hydroxypropionato Complexes of Cobalt(ll), Nickel(II), and Copper(II)

Stability constants for lactato and B-hydroxypropionato complexes of Co(II), Ni(II), and Cu(II) were obtained from spectrophotometric data, using Bjerrum\u27s method of corresponding solutions. Measurements were made in the visible range and the results plotted for graphical evaluation by Fronaeus\u27 method. Graphically determined values for each stability constant were utilized for averaging and least-squares calculations with a digital computer programmed according to R. S. Tobias (»Gauss Z« program)

Muon-spin rotation measurements of the penetration depth of the Mo_3Sb_7 superconductor

Measurements of the magnetic field penetration depth \lambda in superconductor Mo_3Sb_7 (T_c~2.1 K) were carried out by means of muon-spin-rotation. The absolute values of \lambda, the Ginzburg-Landau parameter \kappa, the first H_{c1} and the second H_{c2} critical fields at T=0 are \lambda(0)=720(100)nm, \kappa(0)=55(9), \mu_0H_{c1}(0)=1.8(3)mT, and \mu_0H_{c2}(0)=1.9(2)T. The zero temperature value of the superconducting energy gap \Delta(0) was found to be 0.35(1)meV corresponding to the ratio 2\Delta(0)/k_BT_c=3.83(10). At low temperatures \lambda^{-2}(T) saturates and becomes constant below T~0.3T_c, in agreement with what is expected for s-wave BCS superconductors. Our results suggest that Mo_3Sb_7 is a BCS superconductor with the isotropic energy gapComment: 5 pages, 4 figure

The Nile Water-Food-Energy Nexus under Uncertainty: Impacts of the Grand Ethiopian Renaissance Dam

This is the author accepted manuscript. The final version is available from ASCE via the DOI in this recordData Availability Statement: All data, models, code that support the findings of this study are available from the corresponding author upon request.Achieving a water, food, and energy (WFE) nexus balance through policy interventions is challenging in a transboundary river basin because of the dynamic nature and intersectoral complexity that may cross borders. The Nile basin is shared by a number of riparian countries and is currently experiencing rapid population and economic growth. This has sparked new developments to meet the growing water, food, and energy demands, alleviate poverty, and improve the livelihood in the basin. Such developments could result in basinwide cooperation or trigger conflicts among the riparian countries. A system dynamics model was developed for the entire Nile basin and integrated with the food and energy sectors in Egypt to investigate the future of the WFE nexus with and without the Grand Ethiopian Renaissance Dam (GERD) during filling and subsequent operation using basinwide stochastically generated flows. Different filling rates from 10% to 100% of the average monthly flow are considered during the filling process. Results suggest that the GERD filling and operation would affect the WFE nexus in Egypt, with the impact likely to be significant if the filling process occurred during a dry period. Food production from irrigated agriculture would be reduced by 9%–19% during filling and by about 4% during GERD operation compared with the case without it. The irrigation water supply and hydropower generation in Sudan will be reduced during the filling phase of the GERD, but this is expected to be improved during the dam operation phase as a result of the regulation afforded by the GERD. Ethiopian hydropower generation is expected to be boosted by the GERD during the filling and operation of the dam, adding an average of 15,000  GWh/year once GERD comes online. Lastly, the results reveal the urgency of cooperation and coordination among the riparian countries to minimize the regional risks and maximize the regional rewards associated with the GERD.Ministry of Higher Education (MoHE), EgyptUniversity of Exete

Reintroduction of the European beaver (Castor fiber L.) into Serbia and return of its parasite: The case of Stichorchis subtriquetrus

After becoming extinct in the second half of the 20th century, the European beaver (Castor fiber L., 1758) was successfully reintroduced from Bavaria into Serbia during 2004-2005. In the necropsy of an adult female beaver (found dead in December of 2007), we discovered some parasites identified as Stichorchis subtriquetrus in the colon and peritoneal area. This is the first occurrence of the given specific parasite of beavers in Serbia. Decoding of a subcutaneous implanted microchip has confirmed that our specimen was one of the released beavers. We therefore conclude that the parasite in question was reintroduced into Serbia with the beavers originating from Bavaria.Nakon nestanka u drugoj polovini XX veka, evropski dabar (Castor fiber L. 1758) je tokom 2004-2005. godine, uspešno reintrodukovan sa područja Bavarske u Srbiju. Tokom obdukcije jedne adultne ženke(pronađena mrtva u decembru 2006) pronašli smo parazite u želucu koji su identifikovani kao Stichorchis subtriquetrus. To je prvi nalaz ovog specifičnog parazita dabra u Srbiji. Dekodiranjem subkutano implantiranog mikročipa, potvrđeno je da pronađena ženka jedna od 20 jedinki koje su decembra 2004. godine naseljene na području Specijalnog rezervata prirode Obedska bara. Ova činjenica nam sugeriše da je parazit neželjeno reintrodukovan u Srbiju zajedno sa dabrovima koji su poreklom iz Bavarske naseljavani u Srbiju.Projekat ministarstva br. TR 2001

Investigations of the Changes in the Bentonite Structure Caused by the Different Treatments

Abstract: Th

Magnetic field dependence of the oxygen isotope effect on the magnetic penetration depth in hole-doped cuprate superconductors

The magnetic field dependence of the oxygen-isotope (^{16}O/^{18}O) effect (OIE) on the in-plane magnetic field penetration depth \lambda_{ab} was studied in the hole-doped high-temperature cuprate superconductors YBa_2Cu_4O_8, Y_0.8Pr_0.2Ba_2Cu_3O_7-\delta, and Y_0.7Pr_0.3Ba_2Cu_3O_7-\delta. It was found that \lambda_ab for the ^{16}O substituted samples increases stronger with increasing magnetic field than for the ^{18}O ones. The OIE on \lambda_ab decreases by more than a factor of two with increasing magnetic field from \mu_0H=0.2 T to \mu_0H=0.6 T. This effect can be explained by the isotope dependence of the in-plane charge carrier mass m^\ast_{ab}.Comment: 4 pages, two figure

Polarographic Investigations of Lactato Complexes of Copper, Lead, Cadmium, and Indium

The stability constants of copper, lead , and cadmiwn lactate complexes have been d etermined by the polarographic method in water solutions of a constant ionic strength 2. The examinations were carried out in the lactate concentration range up to 2 M