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Study of steam heat transfer enhanced by CO_(2) and chemical agents: In heavy oil production

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Petroleum Science 2023年第2期20卷 1030-1043页

作者： Ya-li liu Chao Zhang song-yan li Zhao-Min li Key Laboratory of Unconventional Oil&Gas Development(China University of Petroleum(East China)) Ministry of EducationQingdao266580ShandongPR China School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongPR China

Steam flooding with the assistance of carbon dioxide (CO_(2)) and chemicals is an effective approach for enhancing super heavy oil recovery. However, the promotion and application of CO_(2) and chemical agent-assisted steam flooding technology have been restricted by the current lack of research on the synergistic effect of CO_(2) and chemical agents on enhanced steam flooding heat transfer. The novel experiments on CO_(2)–chemicals cooperate affected steam condensation and seepage were conducted by adding CO_(2) and two chemicals (sodium dodecyl sulfate (SDS) and the betaine temperature-salt resistant foaming agent ZK-05200).According to the experimental findings, a “film” formed on the heat-transfer medium surface following the co-injection of CO_(2) and the chemical to impede the steam heat transfer, reducing the heat transfer efficiency of steam, heat flux and condensation heat transfer coefficient. The steam seepage experiment revealed that the temperature at the back end of the sandpack model was dramatically raised by 3.5–12.8 °C by adding CO_(2) and chemical agents, achieving the goal of driving deep-formation heavy oil. The combined effect of CO_(2) and SDS was the most effective for improving steam heat transfer, the steam heat loss was reduced by 6.2%, the steam condensation cycle was prolonged by 1.3 times, the condensation heat transfer coefficient was decreased by 15.5%, and the heavy oil recovery was enhanced by 9.82%. Theoretical recommendations are offered in this study for improving the CO_(2)–chemical-assisted steam flooding technique.

关键词： Steam flooding Heavy oil Carbon dioxide Chemical agent Enhanced oil recovery(EOR) Heat transfer

Penny-shaped interfacial crack between dissimilar magnetoelectroelastic layers

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Acta Mechanica Sinica 2011年第3期27卷 371-381页

作者： yan-song li Zeng-He Xu Wen-Jie Feng Institute of Engineering Mechanics Northeastern University 110004 Shenyang China Department of Engineering Mechanics Shijiazhuang Tiedao University 050043 Shijiazhuang China

A penny-shaped interfacial crack between dissimilar magnetoelectroelastic layers subjected to magnetoelectromechanical loads is investigated,where the magnetoelectrically impermeable crack surface condition is adopted. By using Hankel transform technique,the mixed boundary value problem is firstly reduced to a system of singular integral equations,which are further reduced to a system of algebraic equations. The field intensity factors and energy release rate are finally derived. Numerical results elucidate the eects of crack configuration,electric and/or magnetic loads,and material parameters of the magnetoelectroelastic layers on crack propagation and growth. This work should be useful for the design of magnetoelectroelastic composite structures.

关键词： Interfacial crack . Penny-shaped crack - Hankel transform . Energy release rate.Magnetoelectroelastic layer

Quantum teleportation of particles in an environment

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Chinese Physics B 2020年第6期29卷 79-81页

作者： Lu yang Yu-Chen liu yan-song li State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics Tsinghua UniversityBeijing 100084China Frontiers Science Center of Quantum Information Beijing 100084China School of Physics Jilin UniversityChangchun 130012China

We discuss the teleportation of particles in an environment of an N-body *** this case,we can change a many-body system into an arbitrary shape in space by teleporting some or all the constituent particles,and thus we call the quantum teleportation under this circumstance as quantum tele-transformation(QTT).The particular feature of QTT is that the wave function of the internal degrees of freedom remains the same,while the spatial wave function experiences a drastic *** notion of QTT provides conceptual and pedagogical convenience for quantum information *** view of QTT,teleportation is the change of a single particle in space,while entanglement swapping is the change of one particle of an entangled pair.

关键词： quantum tele-transformation teleportation entanglement swapping

Rotation-translation coupling of a double-headed Brownian motor in a traveling-wave potential

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Frontiers of physics 2021年第3期16卷 165-175页

作者： Wei-Xia Wu Chen-Pu li yan-li song Ying-Rong Han Zhi-Gang Zheng Science Education Department Beijing Institute of Graphic CommunicationBeijing102600China College of Science Hebei University of ArchitectureZhangjiakou075000China School of Science Tianjin UniversityTianjin300072China School of Science Hebei University of TechnologyTianjin300401China Institute of Systems Science and College of Information Science and Engineering Huaqiao UniversityXiamen361021China

Considering a double-headed Brownian motor moving with both translational and rotational degrees of freedom,we investigate the directed transport properties of the system in a traveling-wave *** is found that the traveling wave provides the essential condition of the directed transport for the system,and at an appropriate angular frequency,the positive current can be optimized.A general current reversal appears by modulating the angular frequency of the traveling wave,noise intensity,external driving force and the rod *** transforming the dynamical equation in traveling-wave potential into that in a tilted potential,the mechanism of current reversal is *** both cases of Gaussian and Lévy noises,the currents show similar dependence on the ***,the current in the tilted potential shows a typical stochastic resonance *** external driving force has also a resonance-like effect on the current in the tilted *** the current in the traveling-wave potential exhibits the reverse behaviors of that in the tilted ***,the currents obviously depend on the stability index of the Lévy noise under certain conditions.

关键词： Brownian motor rotation-translation coupling traveling-wave potential current reversal

Expression characteristics of peripheral lymphocyte programmed death 1 and FoxP3+ Tregs in gastric cancer during surgery and chemotherapy

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World Journal of Gastroenterology 2023年第40期29卷 5582-5592页

作者： Hao li Guan-Mei Cao Guo-li Gu song-yan li yang yan Ze Fu Xiao-Hui Du Graduate School Medical School of Chinese People’s Liberation ArmyBeijing 100039China Department of General Surgery Air Force Medical CenterAir Force Medical UniversityBeijing 100142China Department of Radiology Beijing Tiantan HospitalCapital Medical UniversityBeijing 100070China Department of General Surgery Chinese PLA General HospitalBeijing 100039China

BACKGROUND Programmed death 1(PD-1)and CD4^(+)CD25^(+)FoxP3^(+)expression in peripheral blood T-cells has been previously reported in various types of ***,the specific variation tendency during surgery and chemotherapy,as well as their relationship in gastric cancer patients,still remain *** this aspect may provide some novel insights for future studies on tumor recurrence and tumor immune escape,and also serve as a reference for determining the optimal timing and dose of clinical anti-PD-1 *** To observe and analyze the expression characteristics of peripheral lymphocyte PD-1 and FoxP3^(+)regulatory T cells(FoxP3^(+)Tregs)before and after surgery or chemotherapy in gastric cancer *** Twenty-nine stomach cancer patients undergoing chemotherapy after a D2 gastrectomy provided 10 mL peripheral blood samples at each phase of the perioperative period and during *** study also included 29 agematched healthy donors as a control ***-1 expression was detected on lymphocytes,including CD4^(+)CD8^(+)CD45RO^(+),CD4^(+)CD45RO^(+),and CD8^(+)CD45RO^(+)lymphocytes as well as regulatory T *** We observed a significant increase of PD-1 expression on immune subsets and a larger number of FoxP3^(+)Tregs in gastric cancer patients(Plinear correlation analysis indicated a positive correlation between PD-1 expression and the number of CD4^(+)CD45RO^(+)FoxP3high activated Tregs(aTregs)on the total peripheral lymphocytes(r=0.5622,P<0.0001).CONCLUSION The observed alterations in PD-1 expression and the activation of regulatory T cells during gastric cancer treatment may offer novel insights for future investigat

关键词： Programmed death 1 Active regulatory T cells Stomach cancer Peripheral lymphocyte

Multidisciplinary discussion and management of synchronous colorectal liver metastases: A single center study in China

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World Journal of Gastrointestinal Oncology 2023年第9期15卷 1616-1625页

作者： Hao li Guo-li Gu song-yan li yang yan Shi-Dong Hu Ze Fu Xiao-Hui Du Graduate School Medical School of Chinese People’s Liberation ArmyBeijing 100039China Department of General Surgery Air Force Medical CenterAir Force Medical UniversityBeijing 100142China Department of General Surgery Chinese People’s Liberation Army General HospitalBeijing 100039China

BACKGROUND The multidisciplinary team(MDT)has been carried out in many large hospitals ***,given the costs of time and money and with little strong evidence of MDT effectiveness being reported,critiques of MDTs *** To evaluate the effects of MDTs on patients with synchronous colorectal liver metastases and share our opinion on management of synchronous colorectal liver *** In this study we collected clinical data of patients with synchronous colorectal liver metastases from February 2014 to February 2017 in the Chinese People’s liberation Army General Hospital and subsequently divided them into an MDT+group and an *** total,93 patients in MDT+group and 169 patients in MDT-group were included *** Statistical increases in the rate of chest computed tomography examination(P=0.001),abdomen magnetic resonance imaging examination(P=0.000),and preoperative image staging(P=0.0000)were observed in patients in MDT+***,the proportion of patients receiving chemotherapy(P=0.019)and curative resection(P=0.042)was also higher in MDT+*** analysis showed that the population of patients assessed by MDT meetings had higher 1-year[hazard ratio(HR)=0.608,95%confidence interval(CI):0.398-0.931,P=0.022]and 5-year(HR=0.694,95%CI:0.515-0.937,P=0.017)overall *** These results proved that MDT management did bring patients with synchronous colorectal liver metastases more opportunities for comprehensive examination and treatment,resulting in better outcomes.

关键词： Synchronous colorectal liver metastases Multidisciplinary team Imaging examination Treatment strategy Oncological outcome

A review of development methods and EOR technologies for carbonate reservoirs

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Petroleum Science 2020年第4期17卷 990-1013页

作者： Zheng-Xiao Xu song-yan li Bin-Fei li Dan-Qi Chen Zhong-Yun liu Zhao-Min li School of Petroleum Engineering China University of Petroleum(East China)Qingdao 266580ShandongChina Key Laboratory of Unconventional Oil and Gas Development China University of Petroleum(East China)Ministry of EducationQingdao 266580ShandongChina Sinopec Group Beijing 100728China

Carbonate reservoirs worldwide are complex in structure,diverse in form,and highly *** on these characteristics,the reservoir stimulation technologies and fluid flow characteristics of carbonate reservoirs are briefly described in this *** development methods and EOR technologies of carbonate reservoirs are systematically summarized,the relevant mechanisms are analyzed,and the application status of oil fields is *** challenges in the development of carbonate reservoirs are discussed,and future research directions are *** the current development processes of carbonate reservoirs,water flooding and gas flooding remain the primary means but are often prone to channeling *** flooding is an effective method of tertiary oil recovery,but the harsh formation conditions require high-performance chemical *** application of emerging technologies can enhance the oil recovery efficiency and environmental friendliness to a certain extent,which is welcome in hard-to-recover areas such as heavy oil reservoirs,but the economic cost is often *** future research on EOR technologies,flow field control and flow channel plugging will be the potential directions of traditional development methods,and the application of nanoparticles will revolutionize the chemical EOR *** the basis of diversified reservoir stimulation,combined with a variety of modern data processing schemes,multichannel EOR technologies are being developed to realize the systematic,intelligent,and cost-effective development of carbonate reservoirs.

关键词： Carbonate reservoir Reservoir stimulation Flow characteristic Development method EOR technology

Tribological Performance Improvement of Bearing Steel GCr15 by an Alternating Magnetic Treatment

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Acta Metallurgica Sinica(English Letters) 2017年第10期30卷 957-964页

作者： yan-li song Cheng Yu Xia Miao Xing-Hui Han Dong-Sheng Qian Xu Chen Hubei Key Laboratory of Advanced Technology of Automotive Parts Wuhan University of Technology Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan University of Technology School of Materials Science and Engineering Wuhan University of Technology

This paper discusses the tribological performance of the bearing steel GCr15 treated by an alternating magnetic field. The wear test results showed that the average of wear mass losses decreased by nearly 80% after the magnetic treatment, compared to those before the magnetic treatment. The micro-hardness and microstructures（i.e., grain size,carbide morphology and dislocation distribution） before and after the magnetic treatment were experimentally investigated,and the mechanism of the tribological performance improvement of the bearing steel GCr15 due to the magnetic treatment was then revealed based on the above results.

关键词： Tribological performance Magnetic treatment Bearing steel

Effect of psychological nursing intervention on anxiety level and quality of life in patients with gastrointestinal peptic ulcer

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World Journal of Gastrointestinal Surgery 2024年第9期16卷 2953-2960页

作者： Xiao-Rong Zhang yan-song li Ya-Na Xu Department of Neurology Wuhan Fourth HospitalWuhan 430030Hubei ProvinceChina Department of Nursing Bengbu Railway Police CollegeBengbu 233000Anhui ProvinceChina

BACKGROUND Peptic ulcer is a common gastrointestinal disease,and psychological intervention has an important influence on its occurrence and *** To investigate the effect of psychological nursing intervention on the anxiety level and quality of life of patients with gastrointestinal peptic *** Two groups of patients with peptic ulcer were selected from January to December 2012,with 60 cases in each group,and psychological nursing intervention and routine treatment were respectively *** nursing interven-tions include cognitive behavioral therapy,psychological support and relaxation ***-rating anxiety scale(SAS)and quality of life questionnaire were used to evaluate the anxiety level and quality of life of patients before,during and after *** The SAS scores of the experimental group significantly decreased over the course of treatment,from 52.3 before treatment to 30.5 after treatment,while SAS scores of the control group did not change ***,the experimental group's quality of life score(SF-36)significantly improved over the course of treatment,from 65.2 to 85.2,while the control group remained *** analysis showed that sex and age had no significant influence on the effect of *** men and women,young and old,showed similar trends in anxiety relief and improved quality of life after *** Psychological nursing-based intervention program has a positive effect on the anxiety level and quality of life of patients with gastrointestinal peptic ulcer.

关键词： Gastrointestinal peptic ulcer Psychological nursing Anxiety level Quality of life Cognitive behavioral therapy