concentration level
Recently Published Documents

Computer simulation of the Raman lidar equation for measurement of the hydrogen molecules at the concentration level of 1013 cm-3 and higher in atmosphere at the ranging distances up to 100 m in the synchronous photon counting mode and selection of such a lidar optimal parameters have been fulfilled. It is shown that for hydrogen molecules concentration of N(z)=1013 cm-3 measurement at the distances from 5 to 100 m the measurement time t is in the range from 3.83 s to 26.5 min, for measurement of concentration N(z) = 1015 cm-3 - from 38 ms to 15.9 s and for the concentration measurement of N(z) = 1017 cm-3 - already from 0.4 ms to 160 ms, respectively.

Amidst the COVID-19 pandemic situation, the human race has entered the era of hope and transformation, and there is growing pressure and focus to raise awareness to adopt alternative interventions and sustainable practices to ensure gaining sound functioning of physiological organs. Can yoga and meditation promote clarity in thoughts and enhance alertness at work? Does practice of mudras help in improving concentration level of individuals? Do yoga and meditation help to improve the improve quality of life in general? The aim of this chapter is to help new practitioners, scholars, and employees to understand fitness mantra without stress and strain through Indian style of yoga and meditation. This chapter presents an overview of collection of research papers and articles written by yoga experts, saints, and researchers that have emphasized psychology, spirituality, and mentioned evidence for better mental health or effectiveness of yoga, meditation, and mudra interventions as tools for improving the overall personality and mental health of individuals.

The Gaussian solution of the diffusion equation for line source is used to have the first four moments of the vertical concentration distribution (centroid, variance, skewness, and kurtosis). The magnitude and position of maximum concentration level were evaluated. Also the plume advection wind speed is estimated. Equations for the ground level concentration were compared with wind tunnel measurements.

In this article, a planar metamaterial sensor designed at terahertz (THz) frequencies is utilized to sense glucose concentration levels that cover hypoglycemia, normal, and hyperglycemia conditions that vary from 54 to 342 mg/dL. The sensor was developed using a symmetric complementary split rectangular resonator at an oblique incidence angle. The resonance frequency shift was used as a measure of the changes in the glucose level of the samples. The increase in the glucose concentration level exhibited clear and noticeable redshifts in the resonance frequency. For instance, a 67.5 GHz redshift has been observed for a concentration level of 54 mg/dL and increased up to 122 GHz for the 342 mg/dL concentration level. Moreover, a high sensitivity level of 75,700 nm/RIU was observed for this design. In the future, the proposed THz sensors may have potential applications in diagnosing hypocalcemia and hyperglycemia cases.

In this study, the effect of impregnation with natural extracts on decay resistance and color change of pine and beech wood was analyzed. Flowers of Rhododendron luteum and Rhododendron ponticum plants were extracted according to the decoction method and aqueous solutions were prepared at different concentration levels (2 %, 4 % and 7 %). In addition, ferrous sulfate, copper sulfate and aluminum sulfate mordants were added to the solution to improve the properties of the extracts. Then the wood specimens were impregnated with the prepared solutions. The results indicated that the effect of plant species on the mass loss of specimens exposed to T. versicolor (white-rot fungus) was insignificant. Non-mordant extracts had a slight effect on the mass loss of the specimens. However, in pine and beech specimens impregnated with mordant-added (especially ferrous sulfate-added) extracts, mass loss was significantly reduced and resistance to fungal rot was almost completely achieved. The concentration level did not have a significant effect on the mass loss of specimens treated with mordant-added extracts. After impregnation, the L* value of all specimens (especially those treated with ferrous sulfate-added extracts) decreased and the specimens darkened. The a* and b* values increased in specimens treated with non-mordant and aluminum sulfate-added extracts and these specimens tend to have a red-yellow color. The a* value decreased and the b* value increased in wood specimens treated with copper sulfate-added extracts. The green-yellow color trend of these specimens increased. Both the a* and b* values of the specimens treated with ferrous sulfate-added extracts decreased and the green-blue color tendency increased in these specimens. The increase in the concentration level positively affected the determined color changes. The total color change (ΔE*) was higher in wood specimens (especially pine) treated with ferrous sulfate-added R. ponticum extracts.

Abstract The aim of the research was to study the effect of fresh chicken droppings on the dynamics of the physical-chemical and agrochemical properties of sod-podzolic soil and the yield of grain crops. In the sod-podzolic light loamy soil of the Yaroslavl region in the layer of 0-0.20 m in May, fresh chicken droppings were embedded at the dose of 120 t/ha. By autumn, in the 0-0.40 m layer of pHKc1 increased from 4.53-4.99 to 5.38-7.09, the content of mobile phosphorus and exchangeable potassium increased by 2.0-2.4 times, nitrate and ammonium nitrogen - 3-5 times. The content of nitrates in the soil has exceeded the Maximum Allowable Concentration level. The grain yield of the spring wheat studied varieties, triticale and barley varied from 6.7 to 9.5 t/ha, chaffy oats - from 5.7 to 5.9, hulless oats - from 4.4 to 4.6 t/ha. At the beginning of the growing season of crops in the 0-0.40 m layer, the stocks of nitrate nitrogen were close to the stocks of the autumn observation period of 2019, and ammonium nitrogen decreased by 285 kg/ha.

Quail (Coturnix coturnix japonica) is one of the poultry produced meat and eggs commodity. The problem quail raising is excreta produces NH3 and H2S gases are chemicals in a free form and can pollute the environment. This study examines the effect of basil leaf extract on the reduction of NH3 and H2S quail excreta. Fresh excreta given extract with concentration level 200 mg mL-1, 150 mg mL-1, 100 mg mL-1, 50 mg mL then incubate for 24 hours. The method of basil leaf extraction by maceration soaking simplisia on ethanol 96% with comparison ratio 1:10. Antibacterial activity extract test used disc diffusion method. The inoculum contains 106 mL-1 bacterial cells S.aureus and E.coli are spreads on the MHA media then incubated at 37 oC for 24 hour. The result of this study that the levels of NH3 and H2S decreased (P<0.05) after given additional extract. Basil extract can inhibit bacterial activity S.aureus and E.coli (P<0.05). This study indicates that the additional basil leaf extract with a maximum concentration 200 mL-1 optimal can reduce NH3 and H2S gas levels compared to controls were not given additional extract.

A selective and sensitive method has been developed for the determination of ethyl-(3S,4R,5S)-4-acetamido-5-amino-2-azido-3-(pentan-3-yloxy)cyclohexanecarboxylate (OSPRC-A) by using liquid chromatography coupled with mass spectrometer with single mass analyzer (LC-MS).The method was developed by using column DEVELOSIL ODS-UG-5, (50×3.0 mm, 5.0 µm) with linearity range of 0.005% to 0.0151% which meets to quantification level of 150% range. The column oven temperature was maintained at 40ºC. The flow rate was set as 1.5 mL/min. Injection volume was 10 µL and the detection wavelength was 215 nm. The signal to noise ratio values obtained were found to be 4.79 at concentration level of 0.00015% for the limit of detection (LOD) and 13.46 at concentration level of 0.0005% for the limit of quantification (LOQ). The % recovery was found to be in between the range 80.0% to 101.32% at LOQ to 150% level. The result obtained in method precision and intermediate precision are found to be within the specification limit. The percentage RSD for the content of OSPRC-A of method precision was 4.26. The percentage RSD for the content of OSPRC-A for intermediate precision was 4.00. The sample prepared in analytical solution was found to be stable for 24 h. This method can be used for the identification of impurity, OSPRC-A in Oseltamivir phosphate drug substances in its manufacturing.

LC-SPE/cryo NMR and MS methodologies have been developed and employed for a rapid structure determination of 4″-tetrahydrofurfuryl macrozone reaction mixture components. Macrozones, novel conjugates of azithromycin, and thiosemicarbazones have shown very good in vitro antibacterial activities against susceptible and some resistant bacterial strains and are promising agents for further development. The post-column multiple trapping of the chromatographically separated reaction mixture components on the SPE cartridges increased the sensitivity and together with cryogenically cooled NMR probe made it possible to identify and structurally characterize main 4″-tetrahydrofurfuryl macrozone reaction mixture compounds including those present at very low concentration level. This approach has several advantages over a classical off-line procedure, efficiency and low solvent consumption being the two most important ones. All identified components were process-related. It has been demonstrated that two different kinds of compounds with respect to structure were identified, i.e., macrolide-related and thiosemicarbazone-related ones. This methodology can serve as a platform for reliable and effective macrolides reaction components structure profiling, serving as both isolation and identification tools.

The research presented in this article investigates and analyzes the concentration of knowledge production in Brazil, in the context of a public policy, at postgraduate level, by using the spectral methods grounded on the LQ (location quotient) and CI (concentration index) indicators, in three dimensions, from 2013 to 2018. The dimensions are economics, geography, and time. Economics is represented by Fields and Major Fields of knowledge production. Geography corresponds to the regions identified by each Federation unit (FU). Time is a chronological unit of the timeline in which knowledge is produced. The research then evaluates knowledge concentration in the income performance of the families by FU. The results are robust and indicate significant evidence that sectorial knowledge production in Brazil is regionally unequal and impacts on family incomes, but those family incomes evolve regardless of the knowledge concentration level produced. The research contributions are relevant to assist public policy regulators and monitoring managers, as well as to encourage future discoveries in regional economics applications.