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Primary hydatid cyst of the pterygomandibular region: an unusual cyst, location and case report
Siji J,Chiramel,Arjun Gopinath,Sreejith VP,Shermil Sayd 대한구강악안면외과학회 2020 대한구강악안면외과학회지 Vol.46 No.1
Hydatid disease is a zoonotic infection in humans. The disease is endemic in some parts of the world, including Africa, Australia, and Asia, where cattle grazing is common; the disease is spread by an enteric route following the consumption of food contaminated with the eggs of the parasite. Failure to identify this parasite results in delayed diagnosis and increased morbidity to the patient. Upon diagnosis, every possible step should be taken, both surgical and medical, to prevent anaphylactic reactions from the cystic fluid. Postsurgical long-term follow up along with periodical ultrasonography of the liver and computed tomography scan of the abdomen is essential to rule out possible recurrence.
Sijie Tan,Ju Zou,Meixiang Li,David T Yew,S. Tan 대한독성 유전단백체 학회 2015 Molecular & cellular toxicology Vol.11 No.4
Abuse of ketamine increased rapidly and chronic use of ketamine may result in dependence. We investigated the long-term effects of ketamine on anxiety like behaviors and gene expression changes in neurotransmitter receptors and regulators in mice. One month old ICR mice received sub-anesthetics dose of ketamine daily for 3 months. An Elevated Plus Maze (EPM) was employed to assess anxiety like behaviors in these mice and a PCR Array was used to evaluate gene expression changes in neurotransmitter receptors and regulators in the brain. Ketamine decreased the time spent in the open arms and the visit of the open arms in the EPM. Drug dependence related genes, namely Prokr2, Npffr1 and GalR2 were differentially expressed in ketamine treated mice. The results of the present study depicted addictive potential of ketamine and may be beneficial for developing pharmacotherapies for ketamine dependence.
Rejection rate and mechanisms of drugs in drinking water by nanofiltration technology
Sijie Ge,Li Feng,Liqiu Zhang,Qiang Xu,Yifei Yang,Ziyuan Wang,Ki-Hyun Kim 대한환경공학회 2017 Environmental Engineering Research Vol.22 No.3
Nanofiltration (NF) technology is a membrane-based separation process, which has been pervasively used as the high-effective technology for drinking water treatment. In this study, a kind of composite polyamide NF thin film is selected to investigate the removal efficiencies and mechanisms of 14 trace drugs, which are commonly and frequently detected in the drinking water. The results show that the removal efficiencies of most drugs are quite high, indicating the NF is an effective technology to improve the quality of drinking water. The removal efficiencies of carbamazepine, acetaminophen, estradiol, antipyrine and isopropyl-antipyrine in ultrapure water are 78.8 ± 0.8%, 16.4 ± 0.5%, 65.4 ± 1.8%, 71.1 ± 1.5% and 89.8 ± 0.38%, respectively. Their rejection rates increase with the increasing of their three-dimensional sizes, which indicates that the steric exclusion plays a significant role in removal of these five drugs. The adsorption of estradiol with the strongest hydrophobicity has been studied, which indicates that adsorption is not negligible in terms of removing this kind of hydrophobic neutral drugs by NF technology. The removal efficiencies of indomethacin, diclofenac, naproxen, ketoprofen, ibuprofen, clofibric acid, sulfamethoxazole, amoxicillin and bezafibrate in ultrapure water are 81 ± 0.3%, 86.3 ± 0.5%, 85.7 ± 0.4%, 93.3 ± 0.3%, 86.6 ± 2.5%, 90.6 ± 0.4%, 59.7 ± 1.7%, 80.3 ± 1.4% and 80 ± 0.5%, respectively. For these nine drugs, their rejection rates are better than the above five drugs because they are negatively charged in ultrapure water. Meanwhile, the membrane surface presents the negative charge. Therefore, both electrostatic repulsion and steric exclusion are indispensable in removing these negatively charged drugs. This study provides helpful and scientific support of a highly effective water treatment method for removing drugs pollutants from drinking water.
Mathew, Siji,Haridas, Karickal R. Korean Chemical Society 2010 대한화학회지 Vol.54 No.6
Two derivatives of star shaped compounds based on naphthylamine benzene고리에 methoxy기와 ethoxy기가 치환기로 연결되어있는 naphthylamine 관련 화합물을 합성하였다. 합성한 화합물의 전자 및 열적특성을 cyclic voltametry (CV) 및 differential scanning calorimetry (DSC)를 이용하여 조사하였다. Two derivatives of star shaped compounds based on naphthylamine with symmetric trisubstituted benzene as core, methoxy and ethoxy as end substitutions are synthesized. The synthesized compounds are characterized by UV-visible, FT-IR and NMR spectrometric techniques. The electronic and thermal properties of the compounds are studied using cyclic voltametry (CV) and differential scanning calorimetry (DSC) respectively. The data's obtained have similarity with the arylamines that have been already used in optoelectronic devices. So these compounds are interesting materials for applications in such devices.
EFFECT OF A SAUSAGE OSCILLATION ON RADIO ZEBRA-PATTERN STRUCTURES IN A SOLAR FLARE
Yu, Sijie,Nakariakov, V. M.,Yan, Yihua American Astronomical Society 2016 The Astrophysical Journal Vol.826 No.1
<P>Sausage modes that are axisymmetric fast magnetoacoustic oscillations of solar coronal loops are characterized by variation of the plasma density and magnetic field, and hence cause time variations of the electron plasma frequency and cyclotron frequency. The latter parameters determine the condition for the double plasma resonance (DPR), which is responsible for the appearance of zebra-pattern (ZP) structures in time spectra of solar type IV radio bursts. We perform numerical simulations of standing and propagating sausage oscillations in a coronal loop modeled as a straight, field-aligned plasma slab, and determine the time variation of the DPR layer locations. Instant values of the plasma density and magnetic field at the DPR layers allowed us to construct skeletons of the time variation of ZP stripes in radio spectra. In the presence of a sausage oscillation, the ZP structures are shown to have characteristic wiggles with the time period prescribed by the sausage oscillation. Standing and propagating sausage oscillations are found to have different signatures in ZP patterns. We conclude that ZP wiggles can be used for the detection of short-period sausage oscillations and the exploitation of their seismological potential.</P>
Design and Optimization of a New Compliant Rotary Positioning Stage with Constant Output Torque
Piyu Wang,Sijie Yang,Qingsong Xu 한국정밀공학회 2018 International Journal of Precision Engineering and Vol.19 No.12
This paper presents the design, optimization, and experimental testing of a new compliant rotary positioning stage with constant torque output. The constant-torque rotary stage is devised based on flexure-based zero-stiffness beams. It exhibits a simpler structure than existing works and is easier to fabricate. Based on the principle of zero-stiffness beam, the dominant parameters are determined by introducing an optimization algorithm. The performance of the rotary stage is verified by executing finite element analysis (FEA) simulation study, which predicts that the designed stage caters for the desired objective. A prototype rotary stage is fabricated by 3D printer for rapid prototyping. Experimental studies are carried out to validate the proposed conceptual design. Repeatability test verifies the stability and feasibility of the designed constant-torque rotary stage.
Danling Hu,Sijie Liao,Xue Chen,Jincao Du,Kamran Dawood,Sachin Chauhan,Chao Gao,Wei Li 대한화학회 2020 Bulletin of the Korean Chemical Society Vol.41 No.7
A novel fluorescent probe TSA for the high selectivity of mercury (Hg2+) ion has been explored, which was obtained by two-step synthesis. Probe TSA was barely emissive in HEPES buffer. In the presence of Hg2+ ion, the dithioacetal unit in probe TSA was hydrolyzed to be formyl group, consequently causing the intense sky-blue emission via aggregation-induced emission and intramolecular charge transfer mechanisms. Moreover, probe TSA was potential to detect Hg2+ ion in dyeing wastewater and clay soil.
Theoretical Study on the Influence of Welding Collar on the Shear Behavior of Stud Shear Connectors
Yulin Zhan,Siji Lu,Yuanbiao Zheng,Haijun Jiang,Shaohui Xiong 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.4
Arc stud welding will melt the root of the stud to form a welding collar. For the purpose of exploring the influence of welding collar, numerical method is adopted for the theoretical analysis on shear resistance of the stud under several groups of different welding collar parameters. Firstly, the shear resistance between whether the headed studs considering the welding collars or not is compared. Then, the radius and height parameters of welding collar are changed. Finally, the increment ratio of bearing capacity by welding collars with the same height-diameter ratio is taken into consideration. Experimental data from three push-out test are adopted to validate the accuracy of the numerical method. The results show that the welding collar changes the yield area at the bottom of the stud. The height parameter has less influence than the radius. Under the condition that welding collars have the same height-diameter ratio, the improvement of shear resistance with different diameters roughly converges to 7.28%. The formulas of various countries show that at the height-diameter ratio of 0.25, the average value of bearing capacity of welding collar in various specification approach 7.1% of formula value.