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Xing’an Zhao,Biao Huang,Tairan Chen,Guoyu Wang,Deming Gao,Jing Zhao 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.2
We used computational modeling to investigate the cavitation performance of an aviation fuel pump, and optimize structural parameters using the surrogate-based method. In the numerical simulation, a rotation-curvature correction was adapted to the k-ε turbulence model, and a four-component surrogate fuel was selected to reproduce the physical properties of the China RP-3 kerosene. Then the performance of the aviation fuel pump was predicted. In the optimization, based on the series of the numerical results, Surrogate-based analysis and optimization (SBAO) was used to optimize the structural parameters of the fuel pump (the variation of the outlet blade angle for the inducer △β b1 and the variation of the inlet blade angle for the impeller △β b2 ). The results show that the prediction of cavitation performance agrees well with the experimental data. The results show that cavitation areas are mainly distributed in the inlet of the inducer. The volume of cavities grows with the decreasing NPSHa. The head of the fuel pump has a sudden head-drop when NPSHa ≤ 5.64 m. Furthermore, the surrogate-based approach is available in structural optimization of the fuel pump. The cavitation performance of the optimized pump improved about 22 % with a little drop of head coefficient when △β b1 = 4.33° and △β b2 = 3.24°. The numerical approach employed in this paper can accurately predict the cavitating flow of the high rotating speed fuel pump and the surrogate-based method is available in the structural optimization for a better cavitation performance.
Chen, Jun-Xing,Deng, Nan,Chen, Xu,Chen, Ling-Wu,Qiu, Shao-Peng,Li, Xiao-Fei,Li, Jia-Ping Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.5
Purpose: To assess efficacy of Ki67 combined with VEGF as a molecular grading model to predict outcomes with non-muscle invasive bladder cancer (NMIBC). Materials: 72 NMIBC patients who underwent transurethral resection (TUR) followed by routine intravesical instillations were retrospectively analyzed in this study. Univariate and multivariate analyses were performed to confirm the prognostic values of the Ki67 labeling index (LI) and VEGF scoring for tumor recurrence and progression. Results: The novel molecular grading model for NMIBC contained three molecular grades including mG1 (Ki67 $LI{\leq}25%$, VEGF $scoring{\leq}8$), mG2 (Ki67 LI>25%, VEGF $scoring{\leq}8$; or Ki67 $LI{\leq}25%$, VEGF scoring > 8), and mG3 (Ki67 LI > 25%, VEGF scoring > 8), which can indicate favorable, intermediate and poor prognosis, respectively. Conclusions: The described novel molecular grading model utilizing Ki67 LI and VEGF scoring is helpful to effectively and accurately predict outcomes and optimize personal therapy.
Oscillation of Cantilever through In-plane Interdigitated Comb-drive Actuators Driving
Xing Chen,Young-Soo Choi,Dong-Weon Lee 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
We present the concept of scanning force microscopy cantilevers with large deflection and ultra slope at the free end of the lever arm and pure single crystal silicon property exclusion of any types of surface deposition, which are realized through the new actuation mode. This novel cantilever bending actuation mode is firstly proposed totally differing from all of the conventional modes, the out of plane motion of the cantilever is achieved by integrated pre-bent cantilever with in-plane interdigitated comb-drive actuators, the horizontal comb-drive actuator actuation could be transferred to the pre-bent cantilever as a bend moment hence the in-plane actuation of the actuators offer the out of plane actuation for the cantilever.
Design and optimization of in-plane actuator driven cantilever with high sensitivity sensors.
Chen, Xing,Lee, Dong-Weon American Scientific Publishers 2010 Journal of nanoscience and nanotechnology Vol.10 No.5
<P>We present a new mode of actuation and excitation for cantilevers, which endows cantilevers with large deflection for the specific application. Differing from all of the conventional methods in which the deflection is aroused by the vertical drive of cantilever itself or external vibration, the bending and oscillating actuation here is by means of the in-plane actuators, where the out-of-plane motion of the cantilever is driven by the actuation of integrated in-plane actuators combined with curl-shaped cantilever. Because the driving force of the horizontal actuator can be converted through curl-shaped cantilever into a bending moment that results in cantilever deflection, out-of-plane actuation source for cantilever deflection is independent of the cantilever itself. An in-plane electrostatic actuator with comb-drive structures that has two sets of fixed fingers and one set of moving fingers was introduced for both statically bending and dynamically oscillating the cantilever. The optimal structure was obtained through an analytical model and finite element simulation; it achieves a substantially greater deflection and a concentrated stress distribution located on the hinges, in which the integrated piezoresistive sensors are embedded to suffer from larger stress for high sensitive sensing.</P>
Practical Design Methods for Fire Resistance of Restrained Cellular Steel Beams
Xing Chen,Xiangrong Chen,Gang Li 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.6
Thermal responses of steel beams under fi re can be intricate, considering the coupling eff ects between material thermalexpansion, mechanical property degradation, and constraints by surrounding structural members. While research eff orts have focused on catenary action of structural members without initial imperfections, few accurate and effi cient methods are found to reveal the fi re resistance of restrained cellular steel beams (RCSBs). In this paper, parametric and regression analysis are applied to investigate the thermal behavior of RCSBs with initial imperfections. Eight groups of RCSBs are set up to demonstrate how various design parameters may aff ect structural responses at elevated temperatures. The results indicate that axial restraint stiff ness ratio, load ratio, and opening diameter-to-height ratio signifi cantly aff ect the structural responses of RCSBs in fi re, followed by the rotational restraint stiff ness ratio and span-to-depth ratio as secondary eff ects. Through the orthogonal and regression analysis, simplifi ed formulas for four characteristic temperatures and four characteristic internal forces are defi ned, which agree with fi nite element results to a certain extent. Meanwhile, reasonable range of each design parameter is put forward for a more effi cient and applicable calculation of thermo-mechanical responses of RCSBs. The proposed formulas are practical, convenient and accurate enough to be applied for engineering design.
Integrated Logistics Network Optimization by Using a Hybrid Genetic Algorithm
Xing CHEN,Anudari CHULUUNSUKH,윤영수 한국물리학회 2017 New Physics: Sae Mulli Vol.67 No.5
In this paper, we suggest an integrated logistics network optimization (ILNO). For designing the ILNO, the part supplier, part inventory center, module manufacturer, product manufacturer, distribution center, retailer, customer, collection center, remanufacturing center, used market and waste disposal center in forward logistics (FL) and reverse logistics (RL) are taken into consideration. Therefore, the ILNO combines and integrates FL and RL. For the integration concept, several new parts from the part supplier in FL and several recovered parts from the remanufacturing center in RL are sent to the part inventory center, and all of them are then sent to the module manufacturer in FL. A mathematical formulation for representing the ILNO is suggested and is then implemented in a proposed hybrid genetic algorithm (pro-HGA) approach. In a numerical experiment, various comparisons between the pro-HGA approach and other conventional approaches are performed using several scales of the ILNO. The experimental results prove that the pro-HGA approach is more efficient than the others.
Ce3+ triggers fenton-like processes in neutral solutions for effective catechol degradation
Xing Chen,Xu Liu,Hai-Bo Wang,Kang-Ping Cui,Rohan Weerasooriya,Shi-Long He,Guang-Hong Li,Jun Pan,Kai Zhou 대한환경공학회 2022 Environmental Engineering Research Vol.27 No.1
Classical Fenton and Fenton-like processes destruct organic pollutants in water non-selectively to complete mineralization. However, the usage of classical Fenton or Fenton-like processes is often limited due to the narrow operational pH window, sludge accumulation, inefficient H₂O₂ and efficiency decline. To overcome these constraints, in this study, we used a homogeneous Fe<SUP>3+</SUP>-Ce<SUP>3+</SUP>-H₂O₂ Fenton-like process to degrade catechol at different experimental conditions. At pH 7, almost 97% of 10 mM catechol can be destructed within 60 min while the degradation by Classical Fenton or Fe<SUP>3+</SUP>-H₂O₂ Fenton-like process only 36.2% and 23.7%. The resultant solution after the degradation contains only traces of cerium ions. The sludge created by the process was extensively characterized by FTIR and XPS spectroscopy to elucidate the fate of cerium ions. Electron spin resonance (ESR) data confirmed •OH as the major free radical in Fe<SUP>3+</SUP>-Ce<SUP>3+</SUP>-H₂O₂ process. Our Fenton-like process widens the optimal pH values to neutral condition.