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| 1 | Threshold pressure gradient of fluid flow through multi-porous media in low and extra-low permeability reservoirs显示文摘After analyzing many studies of fluid flow theory of multi-porous media in low and extra-low permeability reservoirs and the numerical simulation of non-Darcy flow, we found that a negative flow rate occurs in the existing non-Darcy flow equation, which is unreasonable. We believe that the existing equation can only be considered as a discriminant to judging Darcy flow or non-Darcy flow, and cannot be taken as a fluid flow governing equation of multi-porous media. Our analysis of the experimental results shows that the threshold pressure gradient(TPG) of low and extra-low permeability reservoirs is excessively high, and does not conform to fluid flow through multi-porous media in the actual reservoir situation. Therefore, we present a reasonable TPG ranging from 0.006 to 0.04 MPa/m at the well depth of 1500 m and oil drainage distance of 500 m. The results of our study also indicate that the non-Darcy flow phenomenon will disappear when the TPG reaches a certain value. In addition, the TPG or non-Darcy flow in low and extra-low permeability reservoirs does not need to be considered in the productivity prediction and reservoir numerical simulation. At present, the black oil model or dual-porous media is suitable for simulating low and extra-low permeability reservoirs. | DOU HongEn MA ShiYing ZOU CunYou YAO ShangLin | 2014 | Science China Earth Sciences2014，57，11： | 8 |
| 2 | Stress and sleep:a survey based on wearable sleep trackers among medical and nursing staff in Wuhan during the COVID-19 pandemic显示文摘Backgroud COVID-19 pandemic has significantly affected the sleep health of local medical and nursing staff.Aim We used wearable pulse oximeters to monitor and screen the medical and nursing staff working in hospitals designated for COVID-19 in the Wuhan area.This study aimed to establish a reliable basis to provide sleep intervention for the medical and nursing staff.Methods Thirty medical and nursing staff members with symptoms of insomnia were instructed to wear medical ring-shaped pulse oximeters to monitor their sleep overnight.We also used the Insomnia Severity Index(ISI)and the Chinese version of the Self-Reporting Questionnaire(SRQ-20)to evaluate the severity of insomnia and mental health status,respectively,for each participant.Results Among the 30 participants,only 26 completed the screening.Ten cases(38.5%)demonstrated moderate to severe sleep apnoea-hypopnea syndrome(SAHS)when using an oxygen desaturation index^15 times/hour as the cut-off value.Participants with comorbid moderate to severe SAHS had significantly higher ISI and SRQ scores(p values 0.034 and 0.016,respectively)than those in the insomnia group.Correlation analysis revealed that ISI was positively correlated with total sleep time(TST)(r=0.435,p=0.026),and negatively correlated with deep sleep(r=-0.495,p=0.010);furthermore,patient SRQ scores were positively correlated with TST,sleep efficiency(SE)and REM(rapid eyes movement)sleep%(r=0.454 and 0.389,0.512;p=0.020,0.050 and 0.008,respectively).Stepwise logistic regression indicated that SRQ-20 and sex were risk factors for insomnia with comorbid SAHS,and their OR values were 1.516 and 11.56(95%Cl 1.053 to 2.180 and 1.037 to 128.9),respectively.Conclusion Medical and nursing staff with insomnia showed clear signs of comorbid sleep apnoea attributable to stress.The wearable pulse oximeters accurately monitored the participants'breathing when asleep. | Kaiming Zhuo Cunyou Gao Xiaohui Wang Chen Zhang Zhen Wang | 2020 | General Psychiatry2020，33，3： | 3 |
| 3 | GABRB2 Association with Schizophrenia: Commonalities and Differences Between Ethnic Groups and Clinical Subtypes显示文摘 | Wing-Sze Lo Mutsuo Harano Micha Gawlik Zhiliang Yu Jianhuan Chen Frank W. Pun Ka-Lok Tong Cunyou Zhao Siu-Kin Ng Shui-Ying Tsang Naohisa Uchimura Gerald Stober Hong Xue | 2007 | Biological Psychiatry2007，，5： | 1 |
| 4 | Molten steel level stability in continuous casting slab mold under electromagnetic stirring显示文摘Fluctuation of molten steel level in continuous casting process is a critical issue. The analytic function for the liquid steel surface stability index( F) of the continuous casting slab mold under the action of electromagnetic stirring was derived. The effects on the F value of the electromagnetic field,casting mold,submerged entry nozzle,and casting speed were observed,and the stability of the process parameters of a practical continuous casting system was evaluated. The main results generated are as follows:①Based on the free flow jet theory,a formula is established for the level stability index of continuous casting slab mold under electromagnetic stirring.②According to the results of calculation,the various parameters in decreasing order of the magnitude of their influence are magnetic flux density,nozzle submersion depth,casting speed,slab width,stirring current frequency,and nozzle side-hole inclination angle.③For practical continuous casting with a slab thickness of 230 mm,the calculated F values are between 3 and 5 for different matches between slab width and casting speed,but the parameter optimization space is much larger for wider slab widths and lower casting speeds. | WEN Hongquan WU Cunyou ZHOU Yueming | 2019 | Baosteel Technical Research2019，13，1： | 1 |
| 5 | Progress on research of induction heating in Baosteel显示文摘Owing to the development of newproducts and higher requirement of product properties,the current existing induction heating technology of Baosteel can no longer satisfy the newrequirements of the product line.Control of the induction heating temperature to an appropriate value is a key consideration in induction heating technology. To obtain acculturated temperatures,investigations were focused on the parameters of an induction heating system,including those of induction heating equipment and heating processes. In these investigations,computer simulation was used to model the induction heating process,followed by physical experimentation to verify and improve the simulation model; finally,optimized induction heating parameters were suggested. The use of computer simulations dramatically decreased physical experimental times,and the computed heating parameters were used to guide the physical experimentation and design of the product line; this increased the efficiency of subsequent investigations. This study focuses on the development of induction heating technology in Baosteel,which includes the overall induction heating technology used in manufacturing backup rollers and in the thermomechanical control process. | WU Cunyou ZHOU Yueming JIN Xiaoli | 2016 | Baosteel Technical Research2016，10，1： | 1 |
| 6 | Simulation of temperature field in pipe during single-face quenching process显示文摘Temperature-time curves were measured for the air cooling and laminar cooling of a steel plate.Convective heat transfer coefficients of steel plate and air as well as steel plate and laminar cooling water were computed inversely. Therefore,the temperature field in the single-face quenching process of a steel pipe was simulated using ABAQUS finite element softw are,and the relationships betw een the temperatures and quenching time at different positions of the steel pipe were obtained. In addition,the relationships betw een the cooling rates and quenching time,as w ell as betw een cooling rates and temperatures,were obtained. The simulation quickly produced accurate results,and it can be used to optimize the quenching process. In addition,the results provide a basis for rationally designing the composition of a single-face quenching steel pipe. | LIU Sheng WU Cunyou JIN Xiaoli | 2016 | Baosteel Technical Research2016，10，2： | 1 |
| 7 | The control of crystal orientation in ceramics by imposition of a high magnetic field显示文摘 | Shuqin L Cunyou W Kensuke S Shigeo A | 2006 | Mater Sci Eng A2006，422，： | 1 |
| 8 | Grain refinement of Sn–Pb alloy under a novel combined pulsed magnetic field during solidification显示文摘 | Junshan Hua Yongjie Zhang Cunyou Wu | 2010 | Journal of Materials Processing Tech2010，，3： | 1 |
| 9 | Numerical simulation of multistage induction heating of coated steel tubes in Baosteel显示文摘The electromagnetic and temperature fields in the multistage intermediate-frequency induction heating of coated steel tubes were calculated using a numerical simulation.The influence of the voltage and frequency on the parameters of power circuit and heating temperature of the steel pipe was also analyzed.The results indicate that:(1) the electromagnetic field of induction heating is concentrated between the induction coil and steel tube and dissipated more at both ends of the coil;(2) during the induction heating,the temperature difference between the outer and inner walls of the steel pipe is approximately 3040 K,and the two temperatures rapidly tend to be the same after exiting the induction heater;(3)during the natural cooling,the temperature drop of the steel tube in the low-temperature section is approximately 10 K,and that in the high-temperature section is approximately 20 K;(4)the appropriate induction heating frequency and matching capacitance should be selected,so that the temperature of the steel pipe,especially at the outer wall,meets the coating process requirements,and as to achieve a synchronous improvement of the power efficiency and heating efficiency.This study is beneficial to building a more low-consumption and high-efficiency coating line of large-diameter steel pipes in Baosteel. | HE Chunyao WEN Hongquan WU Cunyou | 2022 | Baosteel Technical Research2022，16，1： | 0 |
| 10 | Physical modeling and numerical simulation of electromagnetic stirring in a slab continuous casting mold显示文摘Through physical modeling and numerical simulation,the flow field in a slab continuous casting mold with electromagnetic stirring is measured under different casting parameters and stirring currents. To qualitatively evaluate the flow field in the mold,two indexes,i. e.,mold flux entrapment and velocity uniformity,are proposed.Based on these two indexes,some optimized stirring parameters under different casting conditions can be determined. | LI Bin LEI Zuosheng GE Jiangmeng ZHONG Yunbo REN Zhongming ZHOU Yueming WU Cunyou JIN Xiaoli WEI Rujun | 2016 | Baosteel Technical Research2016，10，1： | 0 |
| 11 | Effect of induction heating and tempering on properties and microstructures of quenched and tempered pipes显示文摘In this study,a C-Mn quenched steel tube was quickly tempered by induction heating,and the influence of the tempering temperature on its performance was studied and compared with that by traditional tempering. The results show that the yield strength of both is quite strong with regular changes in the tempering temperature,but that the tensile strength of the tube tempered by induction heating is higher than that tempered by traditional tempering by about 25 MPa,and the elongation after induction tempering is significantly higher than that after traditional tempering. The differences in the microstructures of tubes after induction and traditional tempering were compared by metallographic microscope,scanning electron microscopy,and transmission electron microscopy.Theoretical analysis was also performed. Compared with traditional tempering,a fine dispersion of precipitated carbides occurs after induction tempering,which is the main reason for the performance differences. | SUN Wen WU Cunyou LIU Yaoheng MA Yannan ZHANG Zhonghua | 2020 | Baosteel Technical Research2020，14，2： | 0 |
| 12 | Research on electromagnetic properties of electromagnetic stirring roller显示文摘Using computer simulation and test measurements,the relationship between the electromagnetic properties of an electromagnetic stirring roller and the roller structure parameters was analyzed and compared. The distribution of the magnetic field,magnitude of the electromagnetic force,and matched-load characteristics were systematically investigated at different parameter values for the induction coils,iron core,shield,and roller sleeve.The results indicate that the change in the electromagnetic force with stirring frequency is non-linear and has a maximum value higher than 10 Hz;the electromagnetic force largely depends on the diameter of the core;and there is a mutual restriction relationship between the two-phase imbalance and the electromagnetic force. | WU Cunyou KONG Xianghong ZHOU Yueming | 2020 | Baosteel Technical Research2020，14，2： | 0 |
| 13 | Low cost development strategy for oilfields in China under low oil prices显示文摘By reviewing the challenges in the development of oilfields in China under low oil prices,this study analyzes the root causes of cost rising,put forwards the low cost oilfield development strategy and specific paths to realize the strategy,and predicts the development potential and prospect of oilfields in China.In addition to the low grade of the reservoir and high development maturation,the fundamental reasons of development full cost rising of oilfields in China are as follows:(1)Facing the problem of resources turning poorer in quality,we have built production capacity at a pace too fast before making enough technical and experimental preparation;(2)technical engineering service model leads to high service cost;(3)team of oil development expertise and matched engineering system cannot satisfy the technical requirements of stabilizing oil production,controlling water cut and fine development.To realize development at low cost,the core is to increase economic recoverable reserves.The concrete paths include:(1)to explore the'Daqing oilfield development culture',improve the ability of leaders in charge of development,and inspire potential of staff;(2)to improve the ability of reservoir dynamics control,and implement precise development by following scientific principles;(3)to speed up integration of water flooding and enhanced oil recovery(EOR)and technological upgrading in order to enhance oil recovery;(4)to innovate key techniques in gas flooding and accelerate the industrial popularization of gas flooding;(5)to break the related transaction barriers and create new management models;and(6)to collaboratively optimize strategic layout and cultivate key oil bases.Although oilfield development in China faces huge challenges in cost,the low-cost development strategy will succeed as long as strategic development of mature and new oil fields is well planned.The cores to lower cost are to control decline rate and enhance oil recovery in mature oil fields,and increase single well productivity through technical innovation and improve engineering service efficiency through management innovation in new oil fields. | SONG Xinmin QU Debin ZOU Cunyou | 2021 | Petroleum Exploration and Development2021，48，4： | 0 |
| 14 | Numerical simulation of key factors influencing sparking during edge induction heating显示文摘To address the phenomenon of sparking during the edge induction heating process in hot strip mills,this paper uses numerical simulation to systematically investigate the key factors influencing sparking and their effects.The distribution of induced current density in the steel plate above roller conveyor table during the heating process is calculated and compared under different conditions,including the relative positions of the steel plate and induction coil,the width of the steel plate,and changes in load. The results show that when a narrow steel plate is heated or the steel plate shifts to the side of the induction coil,sparking between the steel plate and roller conveyor is more likely to occur. | WU Cunyou JIN Xiaoli ZHOU Yueming | 2018 | Baosteel Technical Research2018，12，4： | 0 |
| 15 | Solute redistribution and macrosegregation in continuous casting slab of carbon steel during solidification process显示文摘Based on the modified Scheil model of solute redistribution,the effects of solidification rate,molten steel flow,and alloy composition on solute macrosegregation during the solidification of carbon steel continuous casting billet are calculated and analyzed. The formation mechanism of 'white band 'segregation under the condition of electromagnetic stirring is also involved,and some practical countermeasures to restrain the central segregation are suggested. The results show that the modified Scheil model can be applied to predict and analyze the macrosegregation of casting slab effectively. The ratio vx/R of the flow velocity of molten steel to solidification rate has decisive formations of segregation such as linear,V,and 'white band'types. It is an effective way to select sufficient terminal cooling and reasonable electromagnetic stirring in order to decrease macrosegregation in the slab. The concept of the characteristic distance of solute enrichment layer can drastically simplify the calculation of solute redistribution at the solid/liquid interface of various elements in carbon steel. | WEN Hongquan WU Cunyou ZHOU Yueming | 2020 | Baosteel Technical Research2020，14，4： | 0 |
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