Numerical evaluation on the intraparticle transfer in butylene oxidative dehydrogenation fixed-bed reactor over ferrite catalysts

Kai Huang,Sheng Lin,Jiejie Wang,Zhenghong Luo 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.29 No.-

Ferrite catalysts with high intraparticle pore volume and surface area are frequently used in theoxidative dehydrogenation of butylene. Whether the non-inclusion of intraparticle transfer limitation infixed-bed reactors for oxidative dehydrogenation over ferrite catalysts in previous studies is appropriateremains unclear. In this study, we attempt to verify this process using a multi-scale modelingtechnology. The multi-scale model consists of a porous medium model and a single particle model underthe oxidative dehydrogenation condition. This model can predict the influences of intraparticle transferon the main component distributions in reactors and demonstrate that the intraparticle transferlimitation is obvious.

A heat shock cognate 70 gene in the endoparasitoid, Pteromalus puparum, and its expression in relation to thermal stress

( Huan Wang ),( Sheng Zhang Dong ),( Kai Li ),( Cui Hu ),( Gong Yin Ye ) 생화학분자생물학회 2008 BMB Reports Vol.41 No.5

Electron Heating and Current Scaling in a Two-dimensional Electron System in Close Proximity to Nanoscale Scatterers

Yi-Ting Wang,Chun-Kai Yang,Sheng-Di Lin,Chi-Te Liang 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.10

We have performed magneto-transport measurements on a two-dimensional electron system(2DES) which is in close proximity to nanoscaled scatterers. Weak localization, as evidenced bynegative magnetoresistance, is observed. In this work, we use the extracted phase coherence rateas a thermometer to measure the electron’s effective temperature Te in our 2DES when a highdriving current I flows through the device. We find that Te / I0.52, consistent with 1/ep T2in two dimensions, where 1/ep is the electron-phonon scattering rate. However, the phase coherencerate 1/ T, with a very small offset, is consistent with zero-temperature dephasing. Mostimportantly, our experimental results are in agreement with the fact that at low temperatures, thedominant phase-breaking mechanism is electron-electron scattering, not electron-phonon scattering. Therefore we are able to investigate both electron-electron scattering and electron-phonon scatteringwhich are, in most cases, difficult to study independently in the linear region. Our data showthat the electron heating effect is a very powerful tool for studying semiconductor devices.

Heavy concrete shielding properties for carbon therapy

Jin-Long Wang,Jiade J Lu,Da-Jun Ding,Wen-Hua Jiang,Ya-Dong Li,Rui Qiu,Hui Zhang,Xiao-Zhong Wang,Huo-Sheng Ruan,Yan-Bing Teng,Xiao-Guang Wu,Yun Zheng,Zi-Hao Zhao,Kai-Zhong Liao,Huan-Cheng Mai,Xiao-Dong Korean Nuclear Society 2023 Nuclear Engineering and Technology Vol.55 No.6

As medical facilities are usually built at urban areas, special concrete aggregates and evaluation methods are needed to optimize the design of concrete walls by balancing density, thickness, material composition, cost, and other factors. Carbon treatment rooms require a high radiation shielding requirement, as the neutron yield from carbon therapy is much higher than the neutron yield of protons. In this case study, the maximum carbon energy is 430 MeV/u and the maximum current is 0.27 nA from a hybrid particle therapy system. Hospital or facility construction should consider this requirement to design a special heavy concrete. In this work, magnetite is adopted as the major aggregate. Density is determined mainly by the major aggregate content of magnetite, and a heavy concrete test block was constructed for structural tests. The compressive strength is 35.7 MPa. The density ranges from 3.65 g/cm³ to 4.14 g/cm³, and the iron mass content ranges from 53.78% to 60.38% from the 12 cored sample measurements. It was found that there is a linear relationship between density and iron content, and mixing impurities should be the major reason leading to the nonuniform element and density distribution. The effect of this nonuniformity on radiation shielding properties for a carbon treatment room is investigated by three groups of Monte Carlo simulations. Higher density dominates to reduce shielding thickness. However, a higher content of high-Z elements will weaken the shielding strength, especially at a lower dose rate threshold and vice versa. The weakened side effect of a high iron content on the shielding property is obvious at 2.5 µSv=h. Therefore, we should not blindly pursue high Z content in engineering. If the thickness is constrained to 2 m, then the density can be reduced to 3.3 g/cm³, which will save cost by reducing the magnetite composition with 50.44% iron content. If a higher density of 3.9 g/cm³ with 57.65% iron content is selected for construction, then the thickness of the wall can be reduced to 174.2 cm, which will save space for equipment installation.

Histogram Analysis of Diffusion Kurtosis Magnetic Resonance Imaging for Diagnosis of Hepatic Fibrosis

Ruo-Fan Sheng,Kai-Pu Jin,Li Yang,He-Qing Wang,Hao Liu,Yuan Ji,Cai-Xia Fu,Meng-Su Zeng 대한영상의학회 2018 Korean Journal of Radiology Vol.19 No.5

Objective: To investigate the diagnostic value of diffusion kurtosis imaging (DKI) histogram analysis in hepatic fibrosis staging. Materials and Methods: Thirty-six rats were divided into carbon tetrachloride-induced fibrosis groups (6 rats per group for 2, 4, 6, and 8 weeks) and a control group (n = 12). MRI was performed using a 3T scanner. Histograms of DKI were obtained for corrected apparent diffusion (D), kurtosis (K) and apparent diffusion coefficient (ADC). Mean, median, skewness, kurtosis and 25th and 75th percentiles were generated and compared according to the fibrosis stage and inflammatory activity. Results: A total of 35 rats were included, and 12, 5, 5, 6, and 7 rats were diagnosed as F0–F4. The mean, median, 25th and 75th percentiles, kurtosis of D map, median, 25th percentile, skewness of K map, and 75th percentile of ADC map demonstrated significant correlation with fibrosis stage (r = -0.767 to 0.339, p < 0.001 to p = 0.039). The fibrosis score was the independent variable associated with histogram parameters compared with inflammatory activity grade (p < 0.001 to p = 0.041), except the median of K map (p = 0.185). Areas under the receiver operating characteristic curve of D were larger than K and ADC maps in fibrosis staging, although no significant differences existed in pairwise comparisons (p = 0.0512 to p = 0.847). Conclusion: Corrected apparent diffusion of DKI histogram analysis provides added value and better diagnostic performance to detect various liver fibrosis stages compared with ADC.

Transcriptome analysis reveals distinct innate immunity and ribosomal response at early stage of AcMNPV infection in haemocyte of silkworm resistant and susceptible strains

Li Tao,Qin Sheng,Sun Xia,Zhang Kai-xiang,Ding Xin-yi,Wang Xue-yang,Li Muwang 한국응용곤충학회 2022 Journal of Asia-Pacific Entomology Vol.25 No.3

Baculoviruses are enveloped rod-shaped viruses that with circular double-stranded and large DNA genome. Baculoviruses successfully invade by using the host factors, especially at the process of establishing early infection. In this study, we investigated the different resistant strains of silkworm in response to AcMNPV early infection by RNA-sequencing. Our data revealed that the genes involved in innate immunity and ribosomal proteins were suppressed and cytoskeleton were induced in susceptible strain p50, thus facilitating the viral replication. However, in resistant strain C108, the genes participated in endocytosis and RNA transport were down-regulated, while up-regulation of ribosomal proteins and energy metabolic to inhibit the infection of the virus. These data provide a new sight of the initial host transcriptional responses to viral infection in silkworm.

EFFECT OF SUBSTITUENTS IN THE IMIDAZOLIUM RING ON THE PERFORMANCE OF SOLID-STATE DYE-SENSITIZED SOLAR CELLS

Juan Li,ZHONG-SHENG WANG,KAI LV,HONG SUN 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.5

Three solid-state imidazolium iodides have been designed and synthesized for use as all-solid-stateelectrolytes in solid-state dye-sensitized solar cells (ssDSSCs). The e®ect of substituents in theimidazolium ring on the ionic conductivity and solar cell performance of ssDSSCs has been inves-tigated. As compared to the methyl-ethyl-substituted imidazolium iodide, replacement of one alkylgroup (the methyl group) with an ester group increases the ionic conductivity and solar cell per-formance signi¯cantly, and further replacement of the other alkyl group (the ethyl group) with ahydroxyethyl group further increases the ionic conductivity and solar cell performance signi¯-cantly. A power conversion e±ciency of 7.45% has been achieved under the irradiation of simulatedAM1.5G solar light (100 mW cm? 2 ) with the ssDSSC using the hydroxyethyl and ester co-func-tionalized imidazolium iodide based solid-state electrolyte and a metal-free organic dye sensitizer.

Percutaneous Endoscopic Interbody Debridement and Fusion for Pyogenic Lumbar Spondylodiskitis: Surgical Technique and the Comparison With Percutaneous Endoscopic Drainage and Debridement

Po-Ju Lai,Sheng-Fen Wang,Tsung-Ting Tsai,Yun-Da Li,Ping-Yeh Chiu,Ming-Kai Hsieh,Fu-Cheng Kao 대한척추신경외과학회 2021 Neurospine Vol.18 No.4

Objective: Surgical treatment of severe infectious spondylodiskitis remains challenging. Although minimally invasive percutaneous endoscopic drainage and debridement (PEDD) may yield good results in complicated cases, outcomes of patients with extensive structural damage and mechanical instability may be unsatisfactory. To address severe infectious spondylodiskitis, we have developed a surgical technique called percutaneous endoscopic interbody debridement and fusion (PEIDF), which comprises endoscopic debridement, bone-graft interbody fusion, and percutaneous posterior instrumentation. Methods: Outcomes of PEIDF in 12 patients and PEDD in 15 patients with infectious spondylodiskitis from April 2014 to July 2018 were reviewed retrospectively. Outcome were compared between 2 kinds of surgical procedures. Results: Patients in PEIDF group had significantly lower rate of revision surgery (8.3% vs. 58.3%), better kyphosis angle (-5.73°±8.74 vs. 1.07°±2.70 in postoperative; 7.09°±7.23 vs. 0.79°±4.08 in kyphosis correction at 1 year), and higher fusion rate (83.3% vs. 46.7%) than those who received PEDD. Conclusion: PEIDF is an effective approach for treating infectious spondylodiskitis, especially in patients with spinal instability and multiple medical comorbidities.

Ischemic postconditioning protects cardiomyocytes against ischemia/reperfusion injury by inducing MIP2

Hong-Lin Zhu,Kang-Kai Wang,Xing Wei,Shun-Lin Qu,Chi Zhang,Xiao-Xia Zuo,Yan-Sheng Feng,Qi Luo,Guang-Wen Chen,Mei-Dong Liu,Lei Jiang,Xian-Zhong Xiao 생화학분자생물학회 2011 Experimental and molecular medicine Vol.43 No.8

Cardiomyocytes can resist ischemia/reperfusion (I/R)injury through ischemic postconditioning (IPoC)which is repetitive ischemia induced during the onset of reperfusion. Myocardial ischemic preconditioning up-regulated protein 2 (MIP2) is a member of the WD-40family proteins, we previously showed that MIP2 was up-regulated during ischemic preconditioning (IPC). As IPC and IPoC engaged similar molecular mechanisms in cardioprotection, this study aimed to elucidate whether MIP2 was up-regulated during IPoC and contributed to IPoC-mediated protection against I/R injury. The experiment was conducted on two models,an in vivo open chest rat coronary artery occlusion model and an in vitro model with H9c2 myogenic cells. In both models, 3 groups were constituted and randomly designated as the sham, I/R and IPoC/hypoxia postconditioning (HPoC) groups. In the IPoC group, after 45 min of ischemia, hearts were allowed three cycles of reperfusion/ischemia phases (each of 30 s duration)followed by reperfusion. In the HPoC group, after 6 h of hypoxia, H9c2 cells were subjected to three cycles of 10 minute reoxygenation and 10 minute hypoxia followed by reoxygenation. IPoC significantly reduced the infarct size, plasma level of Lactate dehydrogenase and creatine kinase MB in rats. 12 h after the reperfusion,MIP2 mRNA levels in the IPoC group were 10 folds that of the sham group and 1.4 folds that of the I/R group. Increased expression of MIP2 mRNA and attenuation of apoptosis were similarly observed in the HPoC group in the in vitro model. These effects were blunted by transfection with MIP2 siRNA in the H9c2cells. This study demonstrated that IPoC induced protection was associated with increased expression of MIP2. Both MIP2 overexpression and MIP2 suppression can influence the IPoC induced protection.

Arm Exoskeleton Rehabilitation Robot with Assistive System for Patient after Stroke

Guan De Lee,Wei-Wen Wang,Kai-Wen Lee,Sheng-Yen Lin,Li-Chen Fu,Jin-Shin Lai,Wen-Shiang Chen,Jer-Junn Luh 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10

Exercise dosage is proven to be an important factor in the physical treatment. Robot assistive approach can improve the rehabilitation quality and evaluate patient’s recovery quantitatively. This paper presents kinematic structure, assistive control system, and integrated F/T sensor for an upper limb rehabilitation robot. By using the human arm dynamic, there are three rehabilitation modes presented in this paper: active mode, assistive mode, and passive mode. In assistive mode, we have two strategies to implement it. One is to amplify interactive torque, and the other is to apply assist-as-needed concept. The goal of this mode is to assist patients to finish motion tasks. The rehabilitation robot under investigation has 7 degree of freedom (DOF) actuated by DC motors, which are programmed to drive the robot arm in the 3D space. To validate our control design, some realistic experiments are conducted and its satisfactory performance is demonstrated. This work is approved clinical testing by the Department of Health, Executive Yuan, R.O.C. So far, we are demonstrating the effect of our controller.