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Sun Xiaoxia,Zhao Yang,Meng Wenjun,Zhai Yiying 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.11
Incorrect formula of average particle vertical velocity can lead to incorrect derivation of the formula of conveying quantity, thus leading to incorrect design of the vertical screw conveyor. In this paper, the vertical velocity of rubber particles in vertical screw conveyor is analyzed by discrete element simulation, and the vertical velocity distribution of particle flow in vertical screw conveyor with different scale structure is analyzed. In order to reduce the computational burden of the training sample and improve the accuracy of the neural network prediction, the BP neural network method is employed. Firstly, the univariate vertical velocity of different influencing factors in microscale structure is trained and predicted, and then the average vertical velocity involving two important input variables, spiral speed and pipe diameter, is trained to get the predicted values of the average vertical velocity of neural network. Finally, the experimental verification is carried out. In this paper, the BP neural network model of the average vertical velocity of rubber particles is established, which not only provides a method for the establishment of other particle neural network models, but also avoids the repeated use of discrete element simulation, and saves a lot of time.
( Haiqing Sun ),( Fernando Bravo De Laguna ),( Shuai Wang ),( Fengju Liu ),( Liang Shi ),( Haidi Jiang ),( Xiaoxia Hu ),( Peng Qin ),( Jiajian Tan ) 한국축산학회 2022 한국축산학회지 Vol.64 No.1
We studied the effects of Saccharomyces cerevisiae boulardii CNCM I-1079 (LSB) supplemented to lactating sows on reproductive traits and farrowing duration and to piglets from day 7 of life on post-weaning performance and IgG concentration. Ninety-six Landrace × Yorkshire sows started the trial 5 days before the expected farrowing date. Sows were distributed into 2 groups according to parity number and backfat thickness: control (CON: regular lactation diet) and LSB (CON + LSB at 2 × 10<sup>9</sup> colony forming units [CFU]/kg of feed). Seven days after birth, litters were randomly selected from each group and supplemented creep feed with or without LSB at 2 × 10<sup>9</sup> CFU/kg. At weaning, piglets from CON sows were shifted to a commercial farm and allocated to 14 pens in groups of 25 piglets/pen according to the creep feed supplemented during lactation. Piglets followed a 3-phase feeding program: creep, pre-starter and starter, with or without LSB at 2 × 10<sup>9</sup> CFU/kg LSB in creep and pre-starter, and 1 × 10<sup>9</sup> CFU/kg LSB in starter. The piglets were vaccinated against classical swine fever on days 41 and 72 of life. One day before each vaccination and at the end of the trial, blood samples were collected from 15 randomly selected piglets per treatment and assessed for total IgG. Supplemented sows with non-supplemented litters displayed the lowest backfat thickness loss during lactation (p < 0.05). The LSB supplementation shortened farrowing duration (p < 0.05) and increased feed intake (p < 0.05) during the first week of lactation. The LSB-fed piglets were heavier at the end of creep (p < 0.05), pre-starter (p < 0.05), and the trial (p < 0.05); grew faster during creep (p < 0.05), starter (p < 0.05), and overall (p < 0.05); and displayed an improved feed conversion ratio during creep (p < 0.05). Total IgG content was higher at days 40 (p < 0.05) and 71 (p < 0.05) in LSB-fed piglets. We conclude that supplementing sows with Saccharomyces cerevisiae boulardii CNCM I-1079 from late gestation until weaning shortens farrowing duration, increases feed intake, and minimizes backfat losses during lactation. When supplemented to piglet diet, post-weaning performance is improved. This improvement observed could be linked to a better immune status, as suggested by the higher IgG.
A Q-gram Filter for Local Alignment in Large Genomic Database
Decai Sun,Xiaoxia Wang 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.1
Fast and exact searching for sequences similar to a query sequence in genomic databases remains a challenging task in molecular biology. In this paper, the problem of finding all e-matches in a large genomic database is considered, i.e. all local alignments over a given length w and an error rate of at most e. A new database searching algorithm called QFLA is designed to solve this problem. The proposed algorithm is a full-sensitivity algorithm which is a refined q-gram filter and implemented on a q-gram index. First, new features are extracted from match-regions by logically partitioning both query sequence and genomic database. Second, a large part of irrelevant subsequences are eliminated quickly by these new features during the searching process. Last, the unfiltered regions are verified by the well-known smith-waterman algorithm. The experimental results demonstrate that our algorithm saves time by improving filtration efficiency in a short filtration time.
( Ouyang Ping ),( Sun Mao ),( He Xuewen ),( Wang Kaiyu ),( Yin Zhongqiong ),( Fu Hualin ),( Li Yinglun ),( Geng Yi ),( Shu Gang ),( He Changliang ),( Liang Xiaoxia ),( Lai Weiming ),( Li Lixia ),( Zou 한국미생물 · 생명공학회 2017 Journal of microbiology and biotechnology Vol.27 No.1
Staphylococcus aureus (S. aureus) is a common gram-positive bacterium that causes serious infections in humans and animals. With the continuous emergence of methicillin-resistant S. aureus (MRSA) strains, antibiotics have limited efficacy in treating MRSA infections. Accordingly, novel agents that act on new targets are desperately needed to combat these infections. S. aureus alpha-hemolysin plays an indispensable role in its pathogenicity. In this study, we demonstrate that sclareol, a fragrant chemical compound found in clary sage, can prominently decrease alpha-hemolysin secretion in S. aureus strain USA300 at sub-inhibitory concentrations. Hemolysis assays, western-blotting, and RT-PCR were used to detect the production of alpha-hemolysin in the culture supernatant. When USA300 was co-cultured with A549 epithelial cells, sclareol could protect the A549 cells at a final concentration of 8 μg/ml. The protective capability of sclareol against the USA300-mediated injury of A549 cells was further shown by cytotoxicity assays and live/dead analysis. In conclusion, sclareol was shown to inhibit the production of S. aureus alpha-hemolysin. Sclareol has potential for development as a new agent to treat S. aureus infections.
Zhao Yang,Sun Xiaoxia,Meng Wenjun 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.6
An incorrect formula of the average axial speed can lead to the incorrect derivation of the conveying volume formula, which in turn can produce an incorrect design of the vertical screw conveyor. In this study, the conveying model of the vertical screw conveyor and the raw coal particle model are established. Using the discrete element method, the influence of various parameters, such as the spiral speed, filling rate, pipe diameter, and pitch, on the axial velocity of the raw coal particles is calculated, simulated, and analyzed. Corresponding to the average axial velocity distribution histogram and the derivation of the particle average axial velocity formula, a theoretical basis for the optimization design of the vertical screw conveyor is provided.
Effects of Additives on Nutrients and Fermentation Quality of Alfalfa Silage
Xiaoqing Zhang,Qizhong Sun,Xingyou Li,Xiaoxia Li 한국초지조사료학회 2009 한국초지조사료학회 학술대회논문집 Vol.2009 No.08
Two-year-old, full flower aohan alfalfa (Medicaga sativa cv. aohan) was chosen to evaluate the silage effect by using different additives of Qingbao Ⅱ , Caihe and Yishengkang. Result indicated that additives increased CP content (P<0.05) and decreased CF, ADF and NDF content significantly (P<0.05). Lactic acid content in additives treatments were significantly higher (P<0.01) than control. These result showed that additives improved silage fermentation quality, reduced cellulose contents and improved silage nutritive value. Among three treatments, Caihe and Yishengkang were priority to Qingbao Ⅱ on the effect of promoting the desired lactic acid fermentation.
Effects of Acteoside on Porcine Oocyte Meiotic Resumption and Development of Parthenogenic Embryo
Keun Jung Kim,Ji Hye Lee,Xiaoxia Li,Eun Young Kim,Youn Bae Park,Kang Sun Park,Yu-Na Ha,Maria Kim,Kil Woo Han,Jun Jong Baek,Jae Sam Lim,Jae Seok Woo,Min Kyu Kim 한국동물번식학회 2012 Reproductive & developmental biology Vol.36 No.2
Effects of Acteoside on Porcine Oocyte Meiotic Resumption and Development of Parthenogenic Embryo
Keun Jung Kim,Ji Hye Lee,Xiaoxia Li,Eun Young Kim,Youn Bae Park,Kang Sun Park,Yu-Na Ha,Maria Kim,Kil Woo Han,Jun Jong Baek,Jae Sam Lim,Jae Seok Woo,Min Kyu Kim 한국동물번식학회 2012 Reproductive & Developmental Biology(Supplement) Vol.36 No.2s
Acteoside acts as an anti-oxidative activity and anti-apoptosis in the cells. But, it has been not studied on maturation and development of porcine oocytes. The aims of the present study were to examine the effects of acteoside on the morphological progress of meiosis, developmental competence, and ROS in porcine oocytes. Oocytes were matured in tissue culture medium-199, supplemented with acteoside at various concentrations: 0 (control), 10, 30 and 50 μM. The oocytes maturation rates of groups supplemented with acteoside were no significantly different (81.13, 85.96, 82.95 and 83.68%, respectively). Level of ROS was significantly decreased in acteoside treated group. Furthermore, the parthenogenetic blastocyst rate was significantly improved in 10 μM acteoside treated group compared with control group (44.83 vs. 27.75%). And we investigated effect of acteoside on the oocytes condition represented by cytoplasmic maturation by homogeneous distribution and formation of cytoplasmic organelles and regulation of apoptosis-related genes. In the results. during IVM, 10 μM acteoside treated oocytes showed that the mitochondria and lipid droplet were smaller and homogeneous distribution in cytoplasm compare with control oocytes. And reverse transcription polymerase chain reaction (RTPCR) of parthenogenetic blstocysts revealed that acteoside increased the anti-apoptotic genes (Mcl-1, Bcl-2 and Bcl-xL), whereas reduced the expression of pro-apoptotic genes (Bax and Bak). In conclusion, based on the results, the effect of acteoside on IVM was not attractive. However, in acteoside treated group, cytoplasmic maturation seemed to be improved with morphologically uniform distribution of cytoplasmic organelles. Furthermore, embryonic development in acteoside treated group was significantly highly increased than that of non-treated group. Our results represents that addition of acteoside to the IVM medium has a beneficial effect in physiology of porcine oocytes, providing a improved method for porcine oocytes in vitro. * This work was supported by a grant (Code# PJ008148) from BioGreen21 Program, Rural Development Administration, Republic of Korea.