1,806 research outputs found
Extractions of zinc from ammoniacal solutions by Hostarex DK-16
No full textHostarex DK-16 was introduced by Hoechst, Germany. This paper concerns the extraction of zinc from aqueous ammoniacal solutions using Hostarex DK-16 as the extractant. The effect of the pH of the aqueous solution, and subsequent zinc ammine complex formation, on the extraction of zinc were examined. The effect of temperature on the extraction of zinc was also studied. Stripping was carried out at various temperatures and acid concentrations. Arrhenius plots were drawn for extraction as well as stripping studies. The extraction and stripping rates and their distribution isotherms have been examined. The loading capacity and temperature effect for Hostarex DK-16 were compared with other extractants
DK conjecture for Grassmannian flips
No full textPh.D.We investigate the DK conjecture on derived categories of coherent sheaves stated by Bondal-Orlov and Kawamata: there should be a derived embedding for any flip and in particular a derived equivalence for any flop. Unlike the situations for flops, there are few examples of flips proven to satisfy the DK conjecture except for some toroidal flips.We construct new examples of flips from Grassmannians, called Grassmannian flips, that satisfy the DK conjecture.我們對由彭督-奧爾洛夫（Bondal-Orlov）和川又（Kawamata）提出關於凝聚層的導出範疇相關的DK猜測進行探討：即對於任何翻轉（flip），都應該有導出（範疇的）嵌入，尤其是對於任何平轉 （flop），都應該有導出（範疇的）等價。與平轉（flop）的情況不同，除了一些環形翻轉（toroidal flips） 之外，鮮有反轉的例子證明能夠被證明滿足DK猜想。我們從格拉斯曼簇出發構造了滿足DK猜想的新例子，稱為格拉斯曼翻轉（Grassmannian flips）。Xie, Ying.Thesis Ph.D. Chinese University of Hong Kong 2020.Includes bibliographical references (leaves 84-88).Abstracts also in Chinese.Title from PDF title page (viewed on February 7, 2022)
Evidence for the Suppressed Decay B- -�� DK-, D -�� K+pi-
No full textThe suppressed decay chain B- -�� DK-, D -�� K+pi(-), where D indicates a (D) over bar (0) or D-0 state, provides important information on the CP-violating angle phi(3). We measure the ratio R-DK of the decay rates to the favored mode B- -�� DK-, D -�� K+pi(-) to be R-DK = [1.63(-0.41)(+0.44)(stat)(-0.13)(+0.07)(syst)] x 10(-2), which indicates the first evidence of the signal with a significance of 4.1 sigma. We also measure the asymmetry A(DK) between the charge-conjugate decays to be A(DK) = -0.39(-0.28)(+0.26)(stat)(-0.03)(+0.04)(syst). The results are based on the full 772 x 10(6) B (B) over bar pair data sample collected at the Gamma(4S) resonance with the Belle detector.We thank the KEKB group for excellent operation of the accelerator, the KEK cryogenics group for efficient solenoid operations, and the KEK computer group and the NII for valuable computing and SINET3 network support. We acknowledge support from MEXT, JSPS and Nagoya’s TLPRC (Japan); ARC and DIISR (Australia); NSFC (China); MSMT (Czechia); DST (India); MEST, NRF, NSDC of KISTI, and WCU (Korea); MNiSW (Poland); MES and RFAAE (Russia); ARRS (Slovenia); SNSF (Switzerland); NSC and MOE (Taiwan); and DOE (USA)
Evidence for the Suppressed Decay B- -> DK-, D -> K+pi-
No full textThe suppressed decay chain B- -> DK-, D -> K+pi(-), where D indicates a (D) over bar (0) or D-0 state, provides important information on the CP-violating angle phi(3). We measure the ratio R-DK of the decay rates to the favored mode B- -> DK-, D -> K+pi(-) to be R-DK = [1.63(-0.41)(+0.44)(stat)(-0.13)(+0.07)(syst)] x 10(-2), which indicates the first evidence of the signal with a significance of 4.1 sigma. We also measure the asymmetry A(DK) between the charge-conjugate decays to be A(DK) = -0.39(-0.28)(+0.26)(stat)(-0.03)(+0.04)(syst). The results are based on the full 772 x 10(6) B (B) over bar pair data sample collected at the Gamma(4S) resonance with the Belle detector.LPH
Measurement of the CKM angle γ in B<sup>±</sup>→DK<sup>∗</sup>(892)<sup>±</sup> decays
No full textMeasurements of CP observables and the CKM angle γ are performed in B±→DK∗(892)± decays, where D represents a superposition of D0 and D¯0 states, using the LHCb dataset collected during Run 1 (2011-2012) and Run 2 (2015-2018). A comprehensive study of this channel is presented with the D meson reconstructed in two-body final states K±π∓, K+K− and π+π−; four-body final states K±π∓π±π∓ and π+π−π+π−; and three-body final states K0Sπ+π− and K0SK+K−. This analysis includes the first observation of the suppressed B±→[π+K−]DK∗± and B±→[π+K−π+π−]DK∗± decays. The combined result gives γ=(63±13)∘
Nu-DESC DK: the Danish version of the nursing delirium screening scale (nu-DESC)
No full textAbstract Background Delirium is one of the most common complications among elderly hospitalized patients, postoperative patients and patients on intensive care units with a prevalence between 11 and 80%. Delirium is associated with higher morbidity and mortality. Reliable instruments are required to detect delirium at an early time point. The Nursing-Delirium Screening Scale (Nu-DESC) is a screening tool with high sensitivity and good specificity. However, there is currently no official translation after ISPOR guidelines of any Danish delirium assessment tools available. Thereby hampering the implementation of 2017 ESA-Guidelines on postoperative Delirium in the clinical routine. The aim of this study is to provide an official translation and evaluation of the Nu-DESC into Danish following the ISPOR process. Methods The Nu-DESC was translated after International Society for Pharmacoecomonics and Outcome Research (ISPOR) guidelines to Danish after permission of the original author, and is evaluated by medical staff and finally approved by the original author. Results All steps of the ISPOR guideline were consecutively followed, without any major problems. The evaluation of the Nu-DESC DK regarding its intelligibility and feasibility showed no statistically significant differences between nurses and medical doctors ratings. The translation was authorized and approved by the original author. Conclusion This study provides the Nu-DESC DK, an official Danish delirium screening instrument, which can detect all psychomotor types of delirium
Relativistic segmented contraction basis sets with core-valence correlation effects for atoms 57La through 71Lu : Sapporo-DK-nZP sets (n = D, T, Q)
No full textFor the 15 lanthanide atoms 57La through 71Lu, we report Sapporo-DK-nZP sets (n = D, T, Q), which are natural extensions of the Sapporo-(DK)-nZP sets for lighter atoms and efficiently incorporate the correlation among electrons in the N through P shells as well as the relativistic effect. The present sets well describe the correlation among the 4s and 4p electrons, which are important in the excitation of 4f electrons. Atomic test calculations of 57La, 58Ce, 59Pr, and 60Nd at configuration interaction with the Davidson correction level of theory confirm high performance of the present basis sets. Molecular test calculations are carried out for 57LaF and 70YbF diatomics at the coupled cluster level of theory. The calculated spectroscopic constants approach smoothly to the experimental values as the quality of the basis set increases
Testicular Protection From Thyroid Hormone Mediated Oxidative Stress. Webmed Central Reproduction 2013; 4: 1–16. Available: http://www.webmedcentral.com/article_view/4252
No full textAbstract Testis is very rich in unsaturated fatty acids with poor antioxidant defense system and due to presence of a potential reactive oxygen species (ROS)-generating systems, it is much more vulnerable to oxidative damage than other tissues. Thyroid hormones are well known to regulate steroidogenesis and spermatogenesis, thereby, affecting male fertility. In the presence of disturbed thyroid conditions, in hyperthyroidism as well as hypothyroidism testis is much more susceptible to oxidative stress. The increase of testicular oxidative stress marked by elevated MDA or TBARS levels, lipid hydroperoxide, hydrogen peroxide or protein carbonyl contents along with disturbed antioxidant enzyme levels happens during L-thyroxine or tri-iodothyronine induced hyperthyroidism. The reduction of testicular oxidative stress can be achieved either by increasing glutathione contents through administration of melatonin or by vitamin E and/or curcumin or by elevating of levels of antioxidant defence enzymes like SOD, CAT or GPx through administration of vitamin E and/or curcumin. In contrast, during hypothyroidism, the extent of testicular oxidative stress is marked by elevation in rat testicular mitochondrial membrane protein carbonylation, lower GSH contents and decreased antioxidant enzyme levels. Hypothyroidism-induced oxidative stress condition could not be reversed with T 3 treatment. Furthermore, such oxidative stress condition is not nullified still after withdrawal of reversible goitrogen PTU. Besides, in case of transient hypothyroidism, the oxidative stress condition is prevailed as marked by decreased antioxidant enzymes like SOD, CAT, GPx and GR levels and that might be responsible for triggering germ cell apoptosis in transient hypothyroid rats results in reduction in sperm count
The Gender Gap in Political Knowledge: Is It All About Guessing? An Experimental Approach
No full textThis article analyzes the extent to which the format and the “Do not know” (DK) protocol of political knowledge questions influence the size of the gender gap. By using a set of experiments that manipulated the DK protocol and the format (open vs. closed ended) of political knowledge questions in a face-to-face representative survey of the Spanish population, we show that the format of the questions (open vs. closed ended) is not relevant in explaining the gender gap. DK protocols, however, influence outspoken levels of political knowledge differently for men and women. DK-discouraging protocols tend to encourage the emergence of hidden knowledge among women, whereas they mostly boost guessing among men. This finding suggests that the meaning and the use of the DK option appear to be gender biased
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