Finite Element Simulation and Experiment Verification of Rolling Forming for the Truck Wheel Rim

Gang Fang,Wei-Ran Gao,Xiao-Ge Zhang 한국정밀공학회 2015 International Journal of Precision Engineering and Vol. No.

The present research aims to investigate general laws of three-pass roll forming of steel wheel rim by finite element simulation. Firstly, finite element models of the rolling process were built on ABAQUS. To ensure the validity of models, some important settings as multistep construction, flexible boundary conditions of side rolls and nonlinear loading curves were considered, which provide the basis for high-accuracy numerical simulation of rim forming. Based on the results of simulation, each pass of the rim forming process was then analyzed. Especially, the investigations of wall thickness distribution and equivalent plastic strain on formed wheel rim are conducted, from which the role of three rolling passes and characteristics of rim forming can be summarized. Moreover, experiment results verified the reliability of finite element model. Subsequently, for analyzing the problems of welding-line cracking, model of flaring dies with various flaring angles were tried in simulations to discuss their influences on forming results of the wheel rim.

GUI Reliability Assessment based on Bayesian Network and Structural Profile

Zhi-Fang Yang,Zhong-Xing Yu,Bei-Bei Yin,Cheng-Gang Bai 보안공학연구지원센터(IJSIP) 2015 International Journal of Signal Processing, Image Vol.8 No.1

Graphical User Interfaces (GUI) is becoming increasingly important in the software field as it builds a friendly way between users and software through continuous interactions. A well-developed GUI is therefore an important factor of software quality. In particular, the reliability of GUIs is still on the way of development. Existing software reliability assessment techniques attempt to statistically describe the software testing process and predict the reliability of the system. However, those techniques are not suitable for GUI as quality of GUI is challenged by immense number of event interactions and complex structural profile etc. Furthermore, GUI has a wealth of information about GUI architecture, components, windows and their interactions with each other, which can be adopted to guide the testing process and establish confidence assessment of GUI. In this paper, a Bayesian network model of GUI reliability is introduced to discuss the reliability model topology and its issues encountered in the modeling process. A case is also presented to verify the validity of the model during the GUI reliability assessment process.

Microwave-assisted Approach for the Rapid Enzymatic Digestion of Rapeseed Meal

Ju-Fang Li,Fang Wei,Lu-Lu Guo,Gang-You Yuan,Feng-Hong Huang,Mu-Lan Jiang,Yuan-Di Zhao,Xu-Yan Dong,Guang-Ming Li,Hong Chen 한국식품과학회 2010 Food Science and Biotechnology Vol.19 No.2

This study demonstrates the use of a new microwave-assisted approach for accelerating the enzymatic digestion of rapeseed meal. The effects of different microwave parameters, such as the time, temperature, and power level, on the degree of hydrolysis (DH) were investigated by using response surface methodology (RSM). The maximum predicted DH value (10.2%) was in good agreement with the value obtained experimentally using an alkaline protease, which was 12.57% under optimal conditions. In only 7 min, the microwave-assisted method achieved a DH value similar to that obtained by the conventional enzymatic digestion method (4 hr). Therefore,this new technique for rapid enzymatic digestion will improve the application of rapeseed meal in the preparation of protein hydrolysates for use in food and feed.

Selective extraction of thorium to directly form self-assembly solid from HNO3 solution

Fang Zhang,Qiang Wu,Lei-Tao Sha,Yang Li,Xu-Xin Li,Ze-Yang Wang,Xuan Fu,Qing-Gang Huang,Bin Liu,Ze-Yi Yan 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.123 No.-

Based on ions exchange between [DMDSA]+[Cl]- (Dimethyl distearyl ammonium chloride) and N,Ndialkyl-succinamide acid (SCA), three novel bifunctional [DMDSA]+[SCA]- ionic liquids (ILs) were firstlysynthesized for extraction of thorium (IV) by self-assembly strategy. The simultaneous extraction andsolidification of Th(IV) were unexpectedly realized in one-step operation using the present ILs in HNO3solution, and more than 99% thorium (IV) was enriched and immediately aggregated into selfassemblysolid at the biphasic interface. The self-assembly solid was further identified by FT-IR, SEM withelement mapping EDS and XPS analysis, and revealing that the self-assembly extraction (SAE) was triggeredby the amphiphilic [DMDSA]+ cations. A three-step extraction mechanism dominated by [SCATh(NO3)4]- was proposed based on the slope analysis method and HRMS analysis. The self-assembly extractionof Th(IV) exhibited the extremely excellent selectivity in the presence of U(VI) and typical lanthanideelements including La(III), Eu(III) and Lu(III), and the separation factors reached 2516 for Th/U, 1885 forTh/La, 1512 for Th/Eu and 558 for Th/Lu, respectively. The proposed SAE strategy was proved to be anefficient method for one-step separation and solidification of thorium ions from U(VI) and/or lanthanides.

Electrochemical control of the conversion of cellulose oligosaccharides into glucose

Fang Yang,Qian Zhang,Hong-Xian Fan,Yang Li,Gang Li 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5

This paper presents a novel method to convert cellulose oligosaccharides to glucose by using constant-potential electrolysis. Firstly experiments were performed to seek the optimum conditions and catalyst dosage to make the catalytic electrode, and it is found that the most active catalytic electrode (g-MnO2/graphite/PTFE) can be made using 5% g-MnO2 as catalysts which is prepared at calcinations temperature of 500 8C and calcinations time of 3 h. Following this, experiments were conducted to find the optimum operation conditions for the maximum glucose yield using the above-developed catalytic electrode. The results show that the maximum glucose yield of 72.4% can be achieved under the following operation conditions: electrolysis potential vs. SEC 1.0 V, pH value of 3 and electrolytic reaction time of 8 h. The cyclic voltammetry performance on MnO2/graphite/PTFE electrode suggests that g-MnO2 acts not only as electrode material but also as a catalyst. The g-MnO2 displays high electrocatalytic activity toward the breakage of b-1,4-glycoside bond of oligosaccharides and gives 100% selectivity to glucose. Crown Copyright

GBA inhibition suppresses ovarian cancer growth, survival and receptor tyrosine kinase AXL-mediated signaling pathways

Gang Wang,Baisha Ouyang,Fang Jing,Xiaoyan Dai 대한약리학회 2023 The Korean Journal of Physiology & Pharmacology Vol.27 No.1

The poor outcome of advanced ovarian cancer under conventional therapy necessitates new strategies to improve therapeutic efficacy. β-glucosidase (encoded by GBA) is a lysosomal enzyme and is involved in sphingolipids metabolism. Recent studies revealed that β-glucosidase plays a role in cancer development and chemoresistance. In this work, we systematically evaluated the expression and role of GBA in ovarian cancer. Our work demonstrates that inhibition of β-glucosidase has therapeutic potential for ovarian cancer. Gene Expression Profiling Interactive Analysis database, western blot and immunohistochemistry analyses of patient samples demonstrated that GBA mRNA and protein expression levels were significantly increased in ovarian cancer compared to normal tissues. Functional studies using gainof- function and loss-of-function approaches demonstrated that GBA overexpression did not affect growth and migration but alleviated cisplatin’s efficacy in ovarian cancer cells. In addition, GBA depletion resulted in growth inhibition, apoptosis induction, and enhancement of cisplatin’s efficacy. Of note, we found that GBA inhibition specifically decreased receptor tyrosine kinase AXL level, leading to the suppression of AXL-mediated signaling pathways. Our data suggest that GBA represents a promising target to inhibit AXL signaling and overcome cisplatin resistance in ovarian cancer.

Preparation and characterization of low density polystyrene/TiO2 core–shell particles for electronic paper application

Xujia Fang,Hong Yang,Gang Wu,Weigang Li,Hongzheng Chen,Mang Wang 한국물리학회 2009 Current Applied Physics Vol.9 No.4

In order to reduce the density mismatch between TiO2 and the low dielectric medium and improve the dispersion stability of the electrophoretic particles in the low dielectric medium for electrophoretic display application, polystyrene/titanium dioxide (PS/TiO2) core–shell particles were prepared via in-situ sol–gel method by depositing TiO2 on the PS particle which was positively charged with 2-(methacryloyloxy) ehyl trimethylammonium chloride (DMC). The morphology and average particle size of PS/TiO2 core–shell particles were observed by transmission electron microscopy (TEM), scanning electron microscope (SEM) and particle size analyzer. It was found that density of PS/TiO2 core–shell particles were reduced obviously and the particles can suspend in the low dielectric medium of low density. The PS/ TiO2 core–shell particles can endure ultrasonic treatment because of the interaction between TiO2 and PS. Zeta potential and electrophoretic mobility of the fabricated core–shell particles in a low dielectric medium with charge control agent was measured to be -44.3 mV and -6.07 × 10-6 ㎠/Vs, respectively, which presents potential in electronic paper application. In order to reduce the density mismatch between TiO2 and the low dielectric medium and improve the dispersion stability of the electrophoretic particles in the low dielectric medium for electrophoretic display application, polystyrene/titanium dioxide (PS/TiO2) core–shell particles were prepared via in-situ sol–gel method by depositing TiO2 on the PS particle which was positively charged with 2-(methacryloyloxy) ehyl trimethylammonium chloride (DMC). The morphology and average particle size of PS/TiO2 core–shell particles were observed by transmission electron microscopy (TEM), scanning electron microscope (SEM) and particle size analyzer. It was found that density of PS/TiO2 core–shell particles were reduced obviously and the particles can suspend in the low dielectric medium of low density. The PS/ TiO2 core–shell particles can endure ultrasonic treatment because of the interaction between TiO2 and PS. Zeta potential and electrophoretic mobility of the fabricated core–shell particles in a low dielectric medium with charge control agent was measured to be -44.3 mV and -6.07 × 10-6 ㎠/Vs, respectively, which presents potential in electronic paper application.

Experimental Study and Numerical Simulation of Precast Shear Wall with Rabbet-Unbonded Horizontal Connection

Chong-fang Sun,Shu-ting Liang,Xiao-jun Zhu,Hu Li,Jian-min Guo,Gang Li,Ya-min Song,Dong-yue Wu 한국콘크리트학회 2020 International Journal of Concrete Structures and M Vol.14 No.1

This paper reports the results of a seismic performance study of a precast shear wall with a new horizontal connection. The new connection is the rabbet-unbonded horizontal connection, which is composed of rabbets and unbonded rebar segments. The rabbets are used to improve the shear capacity and prevent slippage of the connection, and the unbonded rebar segments are used to improve the ductility and energy dissipation. Three specimens were tested with different parameters under cyclic quasi-static loading. The test results showed that the specimen with a larger unbonded level had a richer hysteresis curve, larger ductility, larger energy dissipation, and slightly smaller bearing capacity. Moreover, in relation to the stiffness degradation, in the initial stage, the specimen with a larger unbonded level had a smaller stiffness, whereas in the last stage, the stiffnesses were similar regardless of the unbonded level. A parameter analysis using a finite element model proved that the ductility and energy dissipation of a shear wall with the rabbet-unbonded horizontal connection increased with the unbonded length and level. In addition, when the axial compression ratio increased, the bearing capacity increased, but the load-displacement curves decreased more rapidly. It was concluded that the unbonded length and unbonded level could effectively improve the ductility and energy dissipation of a shear wall. However, they should not be too large under high pressure, and the design suggestions for the new connection need further research considering other factors.

Development of a Harvest Mechanism for Plant Factory Harvest Robots

( Shao-fang Hsu ),( Gang-jhy Wu ),( Yi-chich Chiu ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1

A harvest mechanism was designed and developed for harvesting plant factory cultured plants, lettuce for example. Three major components are included in the mechanism to enable it to harvest one tray of the plant at one time, line by line: a positioning unit aligns a cutting unit to one targeted harvest line, the cutting unit cuts off and collects the plants on the line, and an unloading unit transfers the harvested plants to a collecting box. The position unit then moves the cutting unit to the next line, and the cutting and collecting procedures repeated until one tray of plants were harvested. Experiments were conducted to harvest 9 trays, total 126 plants, of Boston Lettuces with the developed mechanism. The experiment results showed that the averaged time for the mechanism to harvest and unload one tray, 14 plants, of lettuce was 1060 s. The successful harvest rate was 93%. The averaged weight retain rate was 65%, and was affected by the shape of the lettuce (round-shape lettuce resulted in higher retain rate). Quality deterioration condition of the mechanism harvested lettuces was as good as those of the manual harvested ones. Although improvements, like the harvest speed, are needed, the design of the mechanism was proved to be feasible and practical. The developed mechanism will be integrated with a mobile-lifting platform to implement a developing harvest robot for plant factory harvesting.

The Value of Infectious Biomarkers for Prediction of Complication after Pancreatic Surgery

( Yuan Fang ),( Gang Jin ),( Xubao Liu ),( Yajin Chen ),( Bei Sun ),( Zhongtao Zhang ),( Wenchuan Wu ),( Wenhui Lou ) 대한간학회 2018 춘·추계 학술대회 (KASL) Vol.2018 No.1

Aims: To assess the predictive value of biomarkers for early complication after pancreatic surgery. Methods: 950 cases were recruited from 6 centers in China. Procalcitonin,C-reactive protein and WBC were measured on 1st, 3rd and 5th postoperative day . Chi-square test was for the complication risk factors. One-way ANOVA was for the comparison between the biomarkers in these 4 days. ROC curves was for the complication predictive value. Results: 1) 502 with and 448 without complication, pancreatic fistula (380,40%) had the highest morbidity, while the level A B C fistula were 278,90 and 12. 2) In the non-complication subgroup, the mean baseline,POD1, POD3 and POD 5 of PCT were 0.1, 0.81, 0.93, 0.57ug/L (P=0.118); CRP were 8.39, 70.81,99.59, 49.49mg/L (P=0.000). In the complication subgroup, the mean baseline,POD1, POD3 and POD 5 of PCT were 0.09, 0.93, 0.77, 0.37(P=0.000), CRP were 9.30, 79.70, 153.01, 85.83. (P=0.000) 3) There were significant differences in the subgroups classified by occurrence of infectious complication, abdominal infection and sepsis in POD3 and POD 5 of PCT, and significant difference by occurrence of complication, pancreatic fistula in POD3 and POD 5 of CRP, WBC and neutrophil%. 5) The AUC of POD3 and POD 5 of PCT were 0.8, 0.7, 0.6 (P=0.000) to predict sepsis, abdominal infection and infectious complication. AUC of POD3 and POD5 of CRP and WBC were 0.7,0.6 (P=0.000)to predict complication and pancreatic fistula. Conclusions: PCT is better to predict infectious complication, abdominal infection and sepsis while CRP, WBC and Neutrophil % are better to predict complication and pancreatic fistula.