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STABILITY OF TRANSONIC SHOCKS TO THE EULER-POISSON SYSTEM WITH VARyinG BACKGROUND CHARGES

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Acta Mathematica Scientia 2024年第4期44卷 1487-1506页

作者： Yang CAO yuanyuan XING Na ZHANG School of Mathematical Sciences Dalian University of TechnologyDalian 116024China

This paper is devoted to studying the stability of transonic shock solutions to the Euler-Poisson system in a one-dimensional nozzle of finite *** background charge in the Poisson equation is a piecewise constant *** structural stability of the steady transonic shock solution is obtained by the monotonicity ***,this transonic shock is proved to be dynamically and exponentially stable with respect to small perturbations of the initial *** of the crucial ingredients of the analysis is to establish the global well-posedness of a free boundary problem for a quasilinear second order equation with nonlinear boundary conditions.

关键词： Euler-Poisson system transonic shock varying background charges stability

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Argus软件评估乳腺癌新辅助化疗疗效

中国介入影像与治疗学 2016年第1期13卷 52-55页

作者：尹媛媛穆学涛王宏中国人民武装警察部队总医院磁共振科北京100039

目的探讨采用心脏专用Argus软件评估乳腺癌新辅助化疗(NAC)疗效的可行性。方法收集经病理学确诊的乳腺浸润性导管癌患者23例(1例为双侧病变,共计24侧),分别于化疗前及4次化疗后接受3.0T动态增强磁共振扫描(DCE-MRI)。将DCE-MRI第2期图像... 详细信息

目的探讨采用心脏专用Argus软件评估乳腺癌新辅助化疗(NAC)疗效的可行性。方法收集经病理学确诊的乳腺浸润性导管癌患者23例(1例为双侧病变,共计24侧),分别于化疗前及4次化疗后接受3.0T动态增强磁共振扫描(DCE-MRI)。将DCE-MRI第2期图像经3D软件重建后载入心脏专用Argus浏览器,由2名放射科医师分别盲法绘制并计算肿瘤体积,最终结果取二者的平均值。采用配对t检验比较NAC前后肿块体积差异。结果化疗前24侧乳腺癌肿块体积为3.9~42.1cm^3,平均(13.71±9.47)cm^3,4次化疗后体积为0.3~29.4cm^3,平均(4.81±4.15)cm^3,二者差异有统计学意义(t=6.36,P<0.01)。结论 Argus心脏专用软件包可方便、准确地测量乳腺癌肿块体积、用于评估乳腺癌NAC化疗疗效。

关键词：乳腺肿瘤新辅助化疗磁共振成像 Argus软件

企业技术创新过程中专利文献检索应用及适用报告实战研究

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图书情报工作 2007年第10期51卷 60-63,128页

作者：杨薇炯殷媛媛上海图书馆/上海科学技术情报研究所上海200031

通过企业技术创新过程各阶段不同环节中专利信息检索应用及规范的适用报告实战研究,强调专利检索应用在创新过程中对助推企业形成自主知识产权起到重要作用,对企业如何充分利用专利检索、采取各种保护措施和应对策略来提升其创新能力与... 详细信息

通过企业技术创新过程各阶段不同环节中专利信息检索应用及规范的适用报告实战研究,强调专利检索应用在创新过程中对助推企业形成自主知识产权起到重要作用,对企业如何充分利用专利检索、采取各种保护措施和应对策略来提升其创新能力与市场竞争能力,如何及时有效地规避技术创新中潜在的各种专利侵权风险起到有益的指导作用。

关键词：专利信息检索专利信息应用企业技术创新创新过程适用报告

Stage separation of recoverable liquid launch vehicle by using moving pulsating ball analogue for propellant sloshing

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Chinese Journal of Aeronautics 2024年第2期37卷 360-370页

作者： Yu LU Baozeng YUE Bailong HAO Bole MA Feng LIU yuanyuan CHANG School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China Beijing Institute of Astronautical Systems Engineering Beijing 100076China

In the process of stage separation of recoverable liquid launch vehicles,because of the large amount of residual fuel in the storage tanks,the influence of liquid sloshing on separation safety must be *** calculation simplicity and operation practicability,the Moving Pulsating Ball Model(MPBM)of large amplitude liquid sloshing is introduced into the calculation of launch vehicle stage *** the dynamic equation of the model with the energy relationship during"breathing movement",the formula calculating the force of liquid on the rigid body is *** with the calculations of commercial CFD calculation software,the accuracy of MPBM model is ***,all the external forces and moments are applied to the rigid body of the stages,so that the translational and rotational dynamic equations of the stages are obtained *** to the relative position of the two stages,the geometric shape of the interstage section and the engine of the second stage,the minimum clearance in the separation process can be decided to guarantee that the separation process is safe.

关键词： Moving Pulsating Ball Model(MPBM) Dynamics of stage separation Large amplitude sloshing Recoverable liquid launch vehicle Flight dynamics

我国研究联合体研究的知识图谱分析——基于1992—2017年中国知网期刊文献

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科技管理研究 2019年第5期39卷 246-250页

作者：马宗国尹圆圆山东师范大学商学院山东济南250014 济南大学商学院山东济南250002

作为我国企业自主创新的一种有效路径,研究联合体受到学术界的广泛关注。基于知识图谱理论,运用CiteSpace软件绘制研究联合体国内文献的关键词共现知识图谱及研究前沿时间线图,对我国研究联合体研究的热点主题、前沿趋势进行分析。研究... 详细信息

作为我国企业自主创新的一种有效路径,研究联合体受到学术界的广泛关注。基于知识图谱理论,运用CiteSpace软件绘制研究联合体国内文献的关键词共现知识图谱及研究前沿时间线图,对我国研究联合体研究的热点主题、前沿趋势进行分析。研究发现:我国研究联合体的研究主题趋于成熟和完善,多以案例研究为主,研究内容逐渐丰富,正向纵深发展。

关键词：研究联合体知识图谱热点领域前沿趋势

Interfacial friction induced capillary flow within nanofiber-supported ionic liquid droplets

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Green Energy & Environment 2024年第5期9卷 789-791页

作者： yuanyuan Zhao Gang Xia yintung Lam John Haozhong Xin School of Fashion and Textiles The Hong Kong Polytechnic UniversityHong KongChina Shenzhen Research Institute The Hong Kong Polytechnic UniversityShenzhenChina

As global economic growth increases,the demand for energy sources *** fossil fuels have traditionally satisﬁed this demand,their environmental inﬂuence and limited reserves require *** fuel combustion contributes substantially to greenhouse gas emissions,with a pressing need to halve these emissions by 2030 and target net-zero by *** energy sources,contributing currently to 29%of global electricity,are viewed as promising *** wind energy's potential,Zheng's team developed a novel method to harness even low wind speeds using well-aligned nanoﬁbers and an innovative“drop wind generator”.This system,combining moisture-saturated ionic liquid 3-Methyl-1-octylimidazolium chloride with speciﬁc nanoﬁber arrays,exploits wind-inducedﬂows for energy *** study highlights the vast untapped potential of low-speed wind as a sustainable energy source potentially for electronics.

关键词： Wind energy Low-speed wind Ionic liquid Electronic devices

Survivability model of LEO satellite constellation based on GERT with limited backup resources

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Journal of Systems Engineering and Electronics 2024年第4期35卷 976-986页

作者： NIE yuanyuan FANG Zhigeng LIU Sifeng GAO Su College of Economics and Management Nanjing University of Aeronautics and AstronauticsNanjing 211106China Institute of Telecommunication Satellite China Academy of Space TechnologyBeijing 100094China

Survivability is used to evaluate the ability of the satellite to complete the mission after failure,while the duration of maintaining performance is often *** effective backup strategy can restore the constellation performance timely,and maintain good network communication performance in case of satellite *** the perspective of network utility,the low Earth orbit(LEO)satellite constellation survivable graphical eva-luation and review technology(GERT)network with backup satel-lites is constructed.A network utility transfer function algorithm based on moment generating function and Mason formula is proposed,the network survivability evaluation models of on-orbit backup strategy and ground backup strategy are *** survivable GERT model can deduce the expected mainte-nance time of LEO satellite constellation under different fault states and the network utility generated during the state mainte-nance *** case analysis shows that the proposed surviv-able GERT model can consider the satellite failure rate,backup satellite replacement rate,maneuver control replacement ability and life requirement,and effectively determine the optimal sur-vivable backup strategy for LEO satellite constellation with limi-ted resources according to the expected network utility.

关键词： survivability low Earth orbit(LEO)satellite constella-tion graphical evaluation and review technology(GERT) backup strategy

Structural Optimization of the Inlet Header of Supercritical Carbon Dioxide Printed Circuit Board Heat Exchanger

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Journal of Thermal Science 2024年第4期33卷 1458-1467页

作者： WANG Yanquan LU Yuanwei WANG yuanyuan HAN Xinlong WU Yuting GAO Qi MOE Key Laboratory of Enhanced Heat Transfer and Energy Conservation Beijing Key Laboratory of Heat Transfer and Energy ConversionBeijing University of TechnologyBeijing100124China

Supercritical carbon dioxide printed circuit board heat exchangers are expected to be applied in third-generation solar thermal power ***,the uniformity of supercritical carbon dioxide entering the heat exchanger has a significant impact on the overall performance of the heat *** order to improve the uniformity of flow distribution in the inlet header,this article studies and optimizes the inlet header of a printed circuit board heat exchanger through numerical *** results indicate that when supercritical carbon dioxide flows through the header cavity,eddy currents will be generated,which will increase the uneven distribution of flow rate,while reducing the generation of eddy currents will improve the uniform distribution of flow *** the dimensionless factor of the inlet header is 6,the hyperbolic configuration is the optimal *** also reduced the eddy current region by adding transition segments,and the results showed that the structure was the best when the dilation angle was 10°,which reduced the non-uniformity by 21%compared to the hyperbolic configuration,providing guidance for engineering practice.

关键词： third-generation solar thermal power generation inlet header PCHE numerical simulation

EGFR-targeted and gemcitabine-incorporated chemogene for combinatorial pancreatic cancer treatment

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Nano Research 2024年第2期17卷 848-857页

作者： Miao Xie Qiushuang Zhang yuanyuan Guo Lijuan Zhu Xinyuan Zhu Chuan Zhang School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative MoleculesInstitute of Molecular MedicineSixth people’s HospitalSchool of MedicineShanghai Key Laboratory for Molecular Engineering of Chiral DrugsShanghai Jiao Tong UniversityShanghai 200240China Department of Radiology Shanghai Jiao Tong University Affiliated Sixth People’s HospitalSchool of MedicineShanghai Jiao Tong UniversityShanghai 200233China Institute of Molecular Medicine Shanghai Jiao Tong University Affiliated Renji HospitalSchool of MedicineShanghai Jiao Tong UniversityShanghai 200127China

Pancreatic cancer stands out as a recognized intractable tumor due to its high malignancy and mortality rates,which are largely attributed to the insensitivity of current clinical chemotherapies or *** chemo and gene therapy that integrates different therapeutic targets,may increase the chemosensitivity of pancreatic cancer and synergistically enhance the antitumor ***,conventional co-delivery of gene and chemo drugs is intensively dependent on complex nanoparticle delivery systems,thus would be limited by unstable drug packaging,nonspecific biodistribution,and biosafety ***,we rationally designed an epidermal growth factor-receptor(EGFR)-targeted and gemcitabine-incorporated oligonucleotide(termed as chemogene)with anti-Bcl-2 sequence,which achieves simple and precise integration of gemcitabine into a gene regulative agent,as well as the EGFR-targeted delivery for pancreatic cancer *** solid-phase synthesis,gemcitabine,as the first-line chemodrug for pancreatic cancer,is introduced to the antisense oligonucleotide to replace all cytosine nucleosides to obtain the gemcitabine-integrated chemogene(Ge-ASO^(Bcl-2)).Thereafter,Ge-ASO^(Bcl-2)is covalently coupled with EGFR nanobody to construct the final targeted chemogene without any exogenous ***,this nanobody-conjugated chemogene exhibits remarkable tumor targeting capability and antitumor effects both in vitro and in vivo,which initiates a first step toward the application of combinatorial chemo and gene therapy for future pancreatic cancer treatment.

关键词： antisense oligonucleotide chemogene nanobody drug delivery system pancreatic cancer