Wang Y.,Shanghai Tobacco Group Co.
Tobacco Science and Technology | Year: 2013
To avoid suddenly dropping during descending or ascending, the control means of the clamping machine in depot of primary department was modified. The clamper control was changed from PLC time delay sequential control to PLC sequential control combining with in-converter logic control. The accurate control of right clamping time was achieved by setting the control parameters of the frequency converter and modifying the relevant control program. The results of application showed that the improved clamping machine ran well, the incidence of unexpected drop decreased to 0 from 6 times/month, the equipment damage was effectively avoided, the maintenance cost was reduced by about 300 thousand RMB yuan per year, and the machine efficiency was increased.
Zheng S.,Shanghai Tobacco Group Co. |
Hua Q.,Shanghai Tobacco Group Co. |
Gu W.,Shanghai Tobacco Group Co. |
Liu B.,Shanghai Tobacco Group Co.
Journal of Molecular Catalysis A: Chemical | Year: 2014
Catalytic CO oxidation was studied over LaMn1-xFe xO3 perovskites prepared by co-precipitation and rotor-vapor citrate method. The catalysts were characterized by X-ray diffraction (XRD), Transmission electron microscope (TEM) and X-ray photoelectron spectroscopy (XPS). XRD analysis showed that LaMn 1-xFexO3 samples prepared by rotor-vapor citrate method were single-phase perovskite-type oxides, but not prepared by co-precipitation. XPS results indicated that Mn element was mainly in Mn 4+ state and Fe element was mainly in Fe3+ state on the surface of the catalysts. LaMn1-xFexO3 prepared by rotor-vapor citrate method exhibited higher activity for CO oxidation than which prepared by co-precipitation, and among the LaMn1-xFe xO3 series prepared by rotor-vapor citrate method LaMn0.4Fe0.6O3 showed highest activity due to highest BET surface area. The lowest apparent activation energy (Ea) towards the oxidation of CO over LaMn0.4Fe0.6O3 dues to the highest dispersion of Mn4+-O-Fe3+ species on the surface of LaMn0.4Fe0.6O3. © 2014 Elsevier B.V.
Zhou X.,Shanghai Tobacco Group Co.
Tobacco Science and Technology | Year: 2015
The film tends to be out of alignment and its length varies in the process of unwinding, cutting and transferring in carton overwrapper YB95A. The film transferring was driven independently by a servo motor instead of by main drive via referring to the design of carton overwrapper YB917. To achieve that, a servo motor and relevant sensors, encoders and electronic control programs were added. The control unit of the independent transferring device was integrated into the MICRO II control system, and its control program become parts of the MICRO II control program. The adjustment of film length and seam position would be fulfilled by changing the setting on IPC(Industrial Personal Computer). The results showed that the transferring error reduced from ±2 to ±0.5 mm, and the defective cartons decreased from 20-25 to 0-2 carton/day; the cutting length and transferring position of film were automatically regulated. The modified carton overwrapper YB95A is adaptive for color printed film as well. ©, 2015, Editorial Office of Tobacco Science and Technology. All right reserved.
Li J.,East China University of Science and Technology |
Wu Z.,East China University of Science and Technology |
Cheng F.,East China University of Science and Technology |
Li W.,East China University of Science and Technology |
And 3 more authors.
Scientific Reports | Year: 2014
MicroRNAs (miRNAs) play important roles in multiple biological processes and have attracted much scientific attention recently. Their expression can be altered by environmental factors (EFs), which are associated with many diseases. Identification of the phenotype-genotype relationships among miRNAs, EFs, and diseases at the network level will help us to better understand toxicology mechanisms and disease etiologies. In this study, we developed a computational systems toxicology framework to predict new associations among EFs, miRNAs and diseases by integrating EF structure similarity and disease phenotypic similarity. Specifically, three comprehensive bipartite networks: EF-miRNA, EF-disease and miRNA-disease associations, were constructed to build predictive models. The areas under the receiver operating characteristic curves using 10-fold cross validation ranged from 0.686 to 0.910. Furthermore, we successfully inferred novel EF-miRNA-disease networks in two case studies for breast cancer and cigarette smoke. Collectively, our methods provide a reliable and useful tool for the study of chemical risk assessment and disease etiology involving miRNAs.
Li G.,Shanghai Tobacco Group Co. |
Wu D.,Shanghai Tobacco Group Co. |
Xie W.,Shanghai Tobacco Group Co. |
Sha Y.,Shanghai Tobacco Group Co. |
And 2 more authors.
Journal of Chromatography A | Year: 2013
A new one-step derivatization and microextraction technique was developed for determination of amino acids in tobacco samples. In the proposed method, amino acids were derivatized with isobutyl chloroformate (IBCF) in aqueous solution. The derivatives were extracted by dispersive liquid-liquid microextraction based on solidification of floating organic droplet (DLLME-SFO). Parameters affecting the extraction efficiency were investigated in detail. The optimum conditions were as follows: a mixture of 500μL acetone, containing 40μL 2-dodecanol, was rapidly injected by syringe into the 2mL water sample. After centrifugation, the 2-dodecanol droplets were floated at the top of the tube. Then, the tube was cooled in an ice bath. After 5min the solvent had solidified and was then transferred into a conical vial; it melted quickly at room temperature and it was injected into a gas chromatograph for analysis. Under the optimum conditions, the limits of detection were of the order of 0.12-2.82μg/mL. The calibration curves showed good linearity over the investigated concentration range between 0.5 and 200μg/mL with a coefficient of estimation (R2)>0.9887 for GC-MS (SIM). The proposed method is an alternative approach to the quantification of amino acids in tobacco samples. © 2013 Elsevier B.V.
Shanghai Tobacco Group Co. and Shanghai Puffman Automation & Instrument Co. | Date: 2012-07-04
A method and device for forming a cigarette filter rod. The method is as follows: in a process of continuously conveying forward cigarette filter materials that tend to converge to have a rod shape, multiple granular additives are continuously output in accordance with a certain time interval, and are sprayed into the cigarette filter materials that converge forwards under the action of continuous transporting flows, so that after the cigarette filter materials converge to form a continuous filter rod, multiple groups of additive unit combinations formed of different granular additive units are embedded in an axial direction of the filter rod. With the method and device for forming a cigarette filter rod, a filter rod containing multiple granular additives can be formed in one step; multiple granular additives can be combined and arranged in any way along an axial direction of the filter rod; dosage positions and intervals of various granular additives can be adjusted and changed randomly; a production process is simplified and the production cost is reduced.
Shanghai Tobacco Group Co. | Date: 2014-08-18
A full-automatic dynamic tobacco moisture analysis climate chamber comprises an enclosed constant-temperature constant-humidity cabin, which is communicated with an air temperature and humidity processor to form an air circulation loop; a weighing platform is disposed inside the constant-temperature constant-humidity cabin, a sample delivery hanger is hung inside the constant-temperature constant-humidity cabin, at least one placement carrier is disposed below the sample delivery hanger, a sample vessel is placed on the placement carrier, the sample delivery hanger is further connected to a drive mechanism outside the constant-temperature constant-humidity cabin and the drive mechanism drives the sample delivery hanger to perform operations, to place the sample vessel on the weighing platform for weighing. The climate chamber, can minimize the test period, minimize intermediate links and human operation errors, and obtain a moisture content change rule of a tobacco sample as an important basis for performance evaluation of a tobacco humectant.
Shanghai Tobacco Group Co. | Date: 2013-04-07
The present invention relates to the field of tobacco, and more particularly to a use of a saline aqueous solution as a hydrated humectant for tobacco stem. The present invention provides a use of a saline aqueous solution as a hydrated humectant for tobacco stem, and the saline aqueous solution is an aqueous solution of A_(n)B, wherein the cation A is selected from one of potassium, sodium, ammonium, and hydrogen, the anion B is selected from one of hydrogen phosphate, dihydrogen phosphate, oxalate, lactate, citrate, malate, gluconate, and acetate, and n is a positive integer. The hydrated humectants in the present invention has the effect of taking part in a substitution reaction with calcium pectate inside the tobacco stems to generate a hydrated calcium salt, thereby preventing escape of water molecules, reducing evaporation and dissipation of moisture, and achieving a desirable moistening efficacy. Moreover, the inorganic or organic acid and metal salts thereof in the present invention are components of tobacco stem itself or common additives, which are safe, nontoxic, and easy to promote wide application.
Shanghai Tobacco Group Co. | Date: 2010-12-16
A supercritical extraction of characteristic fragrant substances in different fragrant tobacco leaves, which involves the following steps: 1) cutting the tobacco leaves into shreds and placing the shreds into an extraction vessel with supercritical CO_(2 )fluid; 2) setting the extraction pressure and extraction temperature of supercritical CO_(2 )fluid about 100 to 350 bar and 35 to 70 C., extracting statically the tobacco shreds for 10 to 35 minutes in the condition, then setting the dynamic extracting speed of the supercritical CO_(2 )fluid about 1.0 to 3.5 L/min, and extracting dynamically the tobacco shreds for 5 to 15 minutes; 3) collecting the obtained supercritical CO_(2 )fluid extract, and obtaining the key fragrant substances, which act as the determinants for tobacco fragrance, after completely volatilizing CO_(2).
Shanghai Tobacco Group Co. | Date: 2011-07-15
The present invention provides a gas chromatographyinverse gas chromatography combined analysis device, which includes a gas chromatography column and an inverse gas chromatography column, an input end of the gas chromatography column is connected to a sample feeder, an output end of the gas chromatography column is connected to an input end of the inverse gas chromatography column, the output end of the gas chromatography column is further connected to a first detector, the input end of the inverse gas chromatography column is further connected to a carrier gas tube, an output end of the inverse gas chromatography column is connected to a second detector, and the first detector and the second detector are both connected to a signal collector. The present invention not only can investigate adsorption performance of a tested solid adsorption material with respect to a single probe, but also can investigate adsorption performance of different solid adsorption materials with respect to different constituents in a combined probe at the same time, thereby improving the development efficiency of the inverse gas chromatography technologies.