In this study, a novel compound (S)-N-benzyl-1-phenyl-5-(thiophen-3-yl)-4-pentyn-2-amine (abbreviated as BPTPA) was synthesized and structurally characterized by FT-IR, NMR and UV spectroscopy. The molecular geometry and vibrational frequencies of BPTPA in the ground state have been calculated b...

We have prepared 3-methoxymethyl-16β,17β-epiestriol-O-cyclic sulfone (1c) and used it as a substrate for the production of F-18 16α-fluoroestradiol, via nucleophilic fluorination with fluoride ion. The compound is straightforward to make from the commercially available epiestriol and is a sta...

We resolved 1,2-diphenylethylamine (DPEA) into its (S)- and (R)-enantiomer and used them as precursors for synthesis of (S)- and (R)-1-(1,2-diphenylethyl)piperidine, flexible homeomorphs of the NMDA channel blocker MK-801. We also describe the synthesis of the dicyclohexyl analogues of DPEA. The...

The 2-(2-adamantyl)piperidines 13 and 15a-c were synthesized and evaluated for anti-influenza virus A and B activity. The parent N-H compound 13 was 3–4 times more active than amantadine and rimantadine against H2N2 influenza A. N-alkylation of 13 resulted in derivatives 15a-c that were devoid ...

The key hydrolytic enzymes of the endocannabinoid system, fatty acid amide hydrolase (FAAH) and monoacylglycerol lipase (MAGL), are potential targets for various therapeutic applications. In this paper, we present more extensively the results of our previous work on piperazine and piperidine car...

A compact Brillouin thulium-doped fluoride fiber (TDFF) multi-wavelength fiber lasers (MWFLs) operating in the S/S+ band region is proposed and demonstrated. The system is based on a linear design and utilizes two Faraday mirrors at both ends of the cavity to enable bi-directional oscillation. A...

In this paper we give various finiteness results concerning terms of recurrence sequences Un representable as a sum of S-units with a fixed number of terms. We prove that under certain (necessary) conditions, the number of indices n for which Un allows such a representation is finite, and can be...

This paper proposes an adaptive S transform (AST) to extract the feature vectors of voltage sags. With the effective window width matches the Fourier spectrum of sag signals, the standard deviation σ of Gaussian window may be determined as well. The narrowest and the widest window width of AST ...

This paper addresses the single-item single-stocking location non-stationary stochastic lot sizing problem under the (s, S) control policy. We first present a mixed integer non-linear programming (MINLP) formulation for determining near-optimal (s, S) policy parameters. To tackle larger instance...

Nanostructured scheelite (CaWO4) was synthesized by calcination in air of enriched wolframite (Fe1−xMnxWO4) ore and calcium carbonate (CaCO3). The effects of process parameters such as milling conditions of the solid reactants, calcination in flowing or static air, and use of stoichiometric exce...

Various civilian, agricultural and industrial activities cause the presence of nitrogen compounds in surface and groundwater, where they are further converted into ammonia and its salts. The progressive increase in ammonium concentration in the environment represents a serious concern since it i...

Nitrates are important components of atmospheric aerosols. Organic components are widely present in the atmosphere, while their influence on the hygroscopicity of nitrates has not been fully explored. The hygroscopic growth of nitrate aerosols internally mixed with water-soluble organic acids (s...

Protocatechuic acid (PCA) is a natural antioxidant with beneficial cardiovascular properties. In this study, the effect of supplementation with PCA was investigated in deoxycorticosterone acetate (DOCA)-salt hypertension. Male Wistar rats received DOCA (25 mg/kg, s.c.) twice weekly and 1% NaCl i...

A simple method on dispersive liquid–liquid microextraction combining with smartphone colorimetric analysis was developed to determine trace calcium. The colored complex of calcium and glyoxal bis(2-Hydroxyanil) (GBHA) can be extracted into a mixture solvent of chloroform and 1,2-dichloromethan...

The kinetics of nitric acid leaching of cerium was investigated for the oxidation roasted Baotou mixed rare earth concentrate. The effects of leaching temperature, HNO3 concentration, liquid–solid ratio (L/S) and stirring rate on rare earth extraction were studied. The XRD and SEM mapping analy...

The ammonium salt of heteropoly acid (NH4HPA) deposited on the surface of mesoporous silica (SBA-15) support was prepared and characterized using the following analytical techniques: X-ray diffraction (XRD), nitrogen adsorption–desorption, scanning electron microscopy (SEM), particle size analy...

L alanine added nickel sulphate hexahydrate (LANSH)crystals were grown by slow evaporation method in aqueous solution at room temperature. The grown crystals were characterized structurally, optically and thermally. X-ray diffraction studies proved the crystalline nature of the grown compound an...

Supported nickel sulfate was proved to be an efficient catalyst for gas-phase dehydration of glycerol to acrolein at 340 °C in the presence of oxygen. At a GHSV of glycerol of 873 h−1, glycerol conversion over 17NiSO4-350 was still higher than 90% even after 10 h of reaction, with selectivity t...

Lime neutralization is widely used to precipitate heavy metals including copper and nickel from wastewater. Limestone (calcium carbonate: CaCO3) is too stable to be used directly for this purpose. Grinding of CaCO3 in the solutions of copper and nickel sulfate was conducted to raise its reactivi...

Due to the complexity of occurrence of valuable metals and high content of alkali gangue in nickel-copper sulfide concentrate, traditional pyrometallurgical processing is not suitable. In this work, a two-stage co-sulfating roasting process was used to selectively extract valuable metals from Ch...