http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Changrong Liu,Hongbin Tan,Aiguo Zheng,Xiangmei Kang,Ao Jiang,Rui Fang,Haorong Ren,Wanwei Fang 한양대학교 세라믹연구소 2020 Journal of Ceramic Processing Research Vol.21 No.3
The manufacture of sodium sulfide through a carbon reduction process, using sodium sulfate as raw material, generatessodium sulfide by-product sediment, which has potential health and environmental impacts. Herein, a novel strategy isproposed to recover sodium oxide from the sediment by using acidic treatment and the influence of solution pH on sodiumoxide content is systematically studied. The results reveal that the sodium oxide content decreases with decreasing pH valueof the solution. At pH = 4, the as-treated sediment results in Na2O content of 3.10 wt. %, which recovery rate is about 90%. Furthermore, the influences of sintering temperature and time on compressive strength and bulk density are studied. Ingeneral, the compressive strength and bulk density increase with increasing sintering temperature and time. After sinteringat 1,300 oC for 120 min, the compressive strength and bulk density of the sintered porous ceramic are 26.66 MPa and 1.31 g/cm3, respectively. The porous ceramic, sintered at 1,300 oC, mainly consists of hauyne, gehlenite and hematite phases. Insummary, the few flaws in cell-walls result in high compressive strength of the as-prepared porous ceramics.
On the Prevention of Juvenile Deviant Behaviors in Adolescence
Changrong Zhang 아시아경찰학회 2011 아시아경찰학회 국제학술회의 Vol.2011 No.-
Juveniles are in a crucial stage of physical and mental development, and are inclined to have deviant behaviors. So the prevention of juvenile deviance is of great significance for the control of juvenile delinquency. This project conducted a sample survey on 5,594 Grade 9 students, discovering a few new juvenile deviant behaviors in adolescence that deserved attention. Both schools and families still lay emphasis on ranking good and bad academic performances based on their scores, which results in more and more prominent negative effects. Prevention of juvenile deviant behaviors is a very important basis for crime prevention, therefore, the whole society should work together to prevent the juvenile deviance and create positive conditions to reduce the juvenile delinquency by improving infrastructure.
Study of Heat Source Calibration and Modelling for Laser Welding Process
Changrong Chen,Yueh-Jaw Lin,Hengan Ou,Yan Wang 한국정밀공학회 2018 International Journal of Precision Engineering and Vol.19 No.8
Heat source model is an important part when carrying out simulations of welding processes. The calibration process involves a great amount of numerical simulations or theoretical deductions with many simplifications. In this paper, an interaction finite element and optimization algorithm package is programmed to automatically calibrate heat source models. The results are then used to establish mathematical relationships between parameters of heat source and welding process variables. The models show that the absorption efficiency and depth of heat source are exponential functions of depth of focus and laser power, respectively while radius of heat source is determined by depth of focus quadratically.
Preparation of anhydrous from red gypsum and effect of high strength gypsum on its properties
Changrong Liu,Lu Wang,Hongbin Tan,Faqin Dong,Xiaoling Ma,Feihua Yang 한양대학교 청정에너지연구소 2022 Journal of Ceramic Processing Research Vol.23 No.6
Red gypsum waste comes from titanium dioxide production by sulphuric acid method. Anhydrite was prepared from thewaste. The effects of calcined temperature on the properties of anhydrite were studied. The normal consistency of anhydritedecreased with the increase of calcined temperature, while the compressive strength firstly increase and then decrease. Theeffect of high strength gypsum on the properties of anhydrite was also studied. The normal consistency of sample decreasedwith the increase of high strength gypsum content, while the setting time firstly decrease and then increase, strength anddensity increased.
Structure and electrical properties of Bi0.5(Na, K)0.5TiO3-BiGaO3 lead-free piezoelectric ceramics
Changrong Zhou,Xinyu Liu,Weizhou Li,Changlai Yuan,Guohua Chen 한국물리학회 2010 Current Applied Physics Vol.10 No.1
Lead-free piezoelectric ceramics (1 - x - y)Bi0.5Na0.5TiO3-xBi0.5K0.5TiO3- yBiGaO3 have been fabricated by an ordinary sintering technique, and their structure and electrical properties and depolarization temperature have been studied. The results of X-ray diffraction reveal that Bi0.5K0.5TiO3 and BiGaO3 diffuse into the Bi0.5Na0.5TiO3 lattices to form a new solid solution with a pure perovskite structure. An obvious change in microstructure with increasing concentration of Bi0.5K0.5TiO3 and BiGaO3 was observed. The piezoelectric constant d33 and the electromechanical coupling factor kp of the ceramics attain maximum values of 165 pC/N and 0.346 at y = 0.01(x = 0.18) and x = 0.21(y = 0.01), respectively. The temperature dependence of dielectric constant indicates an obvious relaxor characteristic with strong frequency dependence of dielectric constant. The depolarization temperature decreased with increasing content of BiGaO3 and first decreases and then increases with increasing amount of Bi0.5K0.5TiO3.
In situ monitoring of pore structure of magnesium oxysulfate cement paste: Effect of MgSO4/H2O ratio
Shengwen Tang,Changrong Wei,Rongjin Cai,Jiasheng Huang,E. Chen,Junhui Yuan 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.83 No.-
This work systematically presented the pore structure evolution of different magnesium oxysulfate(MOS) cement pastes by non-contact impedance measurement (NCIM), fractal theory and othermicrostructural experiments. According to the evolution of electrical impedance response, threehydration stages (dissolution, acceleration and hardened stages) can be identified in the pastes. Furthermore, based on the results obtained from NCIM and fractal theory, the porosity, incremental porevolume, pore tortuosity, average pore diameter and maximal pore diameter of MOS cement pastes areinvestigated. The influence of MgSO4/H2O ratio on pore structure of MOS cement paste is primarilyexplained. It can be inferred from predicted and experimental results that NCIM is a good method toanalyze the microstructure evolution of MOS cement pastes in-situ.
Peng Li,Changrong Liao 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.12
Dense network deployment is an important approach to meet the requirements of the future mobile communications. LTE-Advanced Heterogeneous Networks (HetNets) has been introduced by the 3rd Generation Partnership Project (3GPP) to increase cell throughput, offload data from macro-cell and improve indoor coverage. However, it also brings serious inter-cell interference with the co-channel deployment. Although the Almost Blank Subframes (ABS) scheme, one solution of Enhanced Inter-Cell Interference Coordination (eICIC), mitigates the interference, it results in undesirable fairness, huge difference of users’ throughput in the system and even the incapability of communication. To address this problem, we introduce Dynamic Subframes Assignment Guaranteeing Fairness (DSAGF), in which the ABS pattern is set to mitigate inter-cell interference while guaranteeing fairness. As demonstrated in the simulation results, DSAGF significant decline in outage ratios of user equipments, narrowing difference of users’ throughput, and improvement for fairness with inter-cell interference mitigation.
( Qiuke Hou ),( Yongquan Huang ),( Changrong Zhang ),( Shuilian Zhu ),( Peiwu Li ),( Xinlin Chen ),( Zhengkun Hou ),( Fengbin Liu ) 대한소화기기능성질환·운동학회(구 대한소화관운동학회) 2018 Journal of Neurogastroenterology and Motility (JNM Vol.24 No.4
Background/Aims MicroRNAs (miRNAs) were reported to be responsible for intestinal permeability in diarrhea-predominant irritable bowel syndrome (IBS-D) rats in our previous study. However, whether and how miRNAs regulate visceral hypersensitivity in IBS-D remains largely unknown. Methods We established the IBS-D rat model and evaluated it using the nociceptive visceral hypersensitivity test, myeloperoxidase activity assay, restraint stress-induced defecation, and electromyographic (EMG) activity. The distal colon was subjected to miRNA microarray analysis followed by isolation and culture of colonic epithelial cells (CECs). Bioinformatic analysis and further experiments, including dual luciferase assays, quantitative real-time polymerase chain reaction, western blot, and enzyme-linked immunosorbent assay, were used to detect the expression of miRNAs and how it regulates visceral hypersensitivity in IBS-D rats. Results The IBS-D rat model was successfully established. A total of 24 miRNAs were differentially expressed in the distal colon of IBS-D rats; 9 were upregulated and 15 were downregulated. Among them, the most significant upregulation was miR-200a, accompanied by downregulation of cannabinoid receptor 1 (CNR1) and serotonin transporter (SERT). MiR-200a mimic markedly inhibited the expression of CNR1/SERT. Bioinformatic analysis and luciferase assay confirmed that CNR1/SERT are direct targets of miR-200a. Rescue experiments that overexpressed CNR1/SERT significantly abolished the inhibitory effect of miR-200a on the IBS-D rats CECs. Conclusions This study suggests that miR-200a could induce visceral hyperalgesia by targeting the downregulation of CNR1 and SERT, aggravating or leading to the development and progression of IBS-D. MiR-200a may be a regulator of visceral hypersensitivity, which provides potential targets for the treatment of IBS-D. (J Neurogastroenterol Motil 2018;24:656-668)
Research on Upgrading Plan of Transmission Line for Voltage Sag Treatment
Wang Xue,Liu Changrong 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.3
When the overhead lines are replaced with cables, the voltage sag will reduce with the decrease of line failure. For a regional power grid, the whole eff ect of voltage sag treatment is directly correlated with the upgrading plan of overhead line. In the paper a method to study the transmission line upgrading plan is proposed, in which the treatment cost, treatment stage and order are considered. First, the upgrading benefi ts and upgrading costs of each overhead line are studied. Then, aimed at the maximum treatment benefi t, the overhead line upgrading plan optimization model of is established, and the cuckoo algorithm is used to solve the model to obtain the upgrading plan. If the lines needed to be upgraded are too many or the investment is limited, the upgrading can’t be done within one year, the model is solved in two stages to obtain the phased upgrading plan. At last, IEEE 30-node system is adopted to test the proposed method. The result shows that compared with other methods the proposed method can provide upgrading plan with more details, and off er theoretical support for the voltage sag treatment in system side