This work analyzes the photometric data of the Oort spike comets C/2019 L3(ATLAS)and C/2019 O3(Palomar)obtained between 2016 and 2023 by the ATLAS network and the Belgian Olmen Observatory.The comets Palomar and ATLAS...This work analyzes the photometric data of the Oort spike comets C/2019 L3(ATLAS)and C/2019 O3(Palomar)obtained between 2016 and 2023 by the ATLAS network and the Belgian Olmen Observatory.The comets Palomar and ATLAS have a typical and unusually high activity level,respectively,based on the Afρparameter corrected to phase angle zero at perihelion.The absolute magnitude of comets ATLAS and Palomar in the o-band is 4.71±0.05 and 4.16±0.02 respectively.The cometary activity of comets ATLAS and Palomar probably began at r>13 au before perihelion and will end at r>14 au after perihelion,which means that they could remain active until the second half of 2026.The nucleus of comet ATLAS has a minimum radius of 7.9 km,and the nucleus of comet Palomar could be a little larger.The c-o colors of the comets ATLAS and Palomar are redder and bluer,respectively,at perihelion than the solar twin YBP 1194.These comets showed a bluish trend in the coma color with decreasing heliocentric distance.Comet Palomar probably had two outbursts after its perihelion,each releasing about 10^(8)kg of dust.The slopes of the photometric profile of the comae of these comets were between 1and 1.5,indicating a steady state during the observation campaign.展开更多
[Objectives]The extraction conditions of formula oolong tea were investigated by an orthogonal experiment.[Methods]The technical conditions were optimized by the 4C method,and the application of formula oolong tea ext...[Objectives]The extraction conditions of formula oolong tea were investigated by an orthogonal experiment.[Methods]The technical conditions were optimized by the 4C method,and the application of formula oolong tea extract in cigarettes was studied.[Results]①In the experimental range,the best sensory evaluation effect of formula oolong tea extract was obtained with extraction conditions of 70%ethanol as extraction solvent,extraction time h,extraction temperature 25℃,and ultrasonic frequency 80 kHz,and follow-up low-temperature concentration,low-temperature sedimentation and low-temperature centrifugation.②The effects of different centrifugal speeds on the quality of formula oolong tea extract were explored.The formula oolong tea extract obtained under the conditions of 3000 r/min and centrifugal time of 10 min showed the best evaluation effect with soft and delicate smoke,rich smoke fragrance,good comfort and refreshing mouthfeel.③The effective aroma components in the formula oolong tea extract were qualitatively analyzed by GC-MS.[Conclusions]This study provides high-quality raw materials and a theoretical basis for the research of independent flavor blending in cigarette industry enterprises.展开更多
The prevalence of Hepatitis C viral infection in Egypt is the highest rate in the world. It is a major public health problem in Egypt. The objective of this study was to detect the clearance of HCV-RNA in Egyptian pat...The prevalence of Hepatitis C viral infection in Egypt is the highest rate in the world. It is a major public health problem in Egypt. The objective of this study was to detect the clearance of HCV-RNA in Egyptian patients who were recommended for combination therapy of pyglated interferon α 2a and ribavirin (PEG-interferon/Ribavirin). Ninety-five positive HCV-IgG cases were tested for HCV-RNA at baseline and at weeks 4, 12, 24, 48 and 72 of treatment with PEG-interferon α 2a/Ribavirin. The correlations between the viral parameters during and after treatment were evaluated. Patients recommended receiving PEG-interferon 2a/ribavirin combination therapy showed high response rate determined as 71.9% achieved Sustained Virological Response (SVR) from total patients, and 71.4% from patients who received 48 weeks therapy. In general, the employment of TMA provided us the accuracy of results with confidence in our work. There was a significant relation (p < 0.001) between results of Transcription mediated amplification (TMA) and response to therapy that indicate to positive correlation. The development of sensitive accurate assays for HCV-RNA detection and quantification is necessary to improve not only the assessment of the response to antiviral therapy but also our understanding of the mechanism underlying antiviral resistance.展开更多
基金The ATLAS project is primarily funded to search for near-earth asteroids through NASA grants NN12AR55G,80NSSC18K0284,and 80NSSC18K1575funded by Kepler/K2 grant J1944/80NSSC19K0112 and HST GO-15889,and STFC grants ST/T000198/1 and ST/S006109/1。
文摘This work analyzes the photometric data of the Oort spike comets C/2019 L3(ATLAS)and C/2019 O3(Palomar)obtained between 2016 and 2023 by the ATLAS network and the Belgian Olmen Observatory.The comets Palomar and ATLAS have a typical and unusually high activity level,respectively,based on the Afρparameter corrected to phase angle zero at perihelion.The absolute magnitude of comets ATLAS and Palomar in the o-band is 4.71±0.05 and 4.16±0.02 respectively.The cometary activity of comets ATLAS and Palomar probably began at r>13 au before perihelion and will end at r>14 au after perihelion,which means that they could remain active until the second half of 2026.The nucleus of comet ATLAS has a minimum radius of 7.9 km,and the nucleus of comet Palomar could be a little larger.The c-o colors of the comets ATLAS and Palomar are redder and bluer,respectively,at perihelion than the solar twin YBP 1194.These comets showed a bluish trend in the coma color with decreasing heliocentric distance.Comet Palomar probably had two outbursts after its perihelion,each releasing about 10^(8)kg of dust.The slopes of the photometric profile of the comae of these comets were between 1and 1.5,indicating a steady state during the observation campaign.
文摘[Objectives]The extraction conditions of formula oolong tea were investigated by an orthogonal experiment.[Methods]The technical conditions were optimized by the 4C method,and the application of formula oolong tea extract in cigarettes was studied.[Results]①In the experimental range,the best sensory evaluation effect of formula oolong tea extract was obtained with extraction conditions of 70%ethanol as extraction solvent,extraction time h,extraction temperature 25℃,and ultrasonic frequency 80 kHz,and follow-up low-temperature concentration,low-temperature sedimentation and low-temperature centrifugation.②The effects of different centrifugal speeds on the quality of formula oolong tea extract were explored.The formula oolong tea extract obtained under the conditions of 3000 r/min and centrifugal time of 10 min showed the best evaluation effect with soft and delicate smoke,rich smoke fragrance,good comfort and refreshing mouthfeel.③The effective aroma components in the formula oolong tea extract were qualitatively analyzed by GC-MS.[Conclusions]This study provides high-quality raw materials and a theoretical basis for the research of independent flavor blending in cigarette industry enterprises.
文摘The prevalence of Hepatitis C viral infection in Egypt is the highest rate in the world. It is a major public health problem in Egypt. The objective of this study was to detect the clearance of HCV-RNA in Egyptian patients who were recommended for combination therapy of pyglated interferon α 2a and ribavirin (PEG-interferon/Ribavirin). Ninety-five positive HCV-IgG cases were tested for HCV-RNA at baseline and at weeks 4, 12, 24, 48 and 72 of treatment with PEG-interferon α 2a/Ribavirin. The correlations between the viral parameters during and after treatment were evaluated. Patients recommended receiving PEG-interferon 2a/ribavirin combination therapy showed high response rate determined as 71.9% achieved Sustained Virological Response (SVR) from total patients, and 71.4% from patients who received 48 weeks therapy. In general, the employment of TMA provided us the accuracy of results with confidence in our work. There was a significant relation (p < 0.001) between results of Transcription mediated amplification (TMA) and response to therapy that indicate to positive correlation. The development of sensitive accurate assays for HCV-RNA detection and quantification is necessary to improve not only the assessment of the response to antiviral therapy but also our understanding of the mechanism underlying antiviral resistance.
