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How to balance the development of new surgical techniques and protection of patients' health interests

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Hepatobiliary Surgery and Nutrition 2020年第3期9卷 333-335页

作者： xiao-Ping geng Hepatobiliary Surgery Department The First Affiliated Hospital of Anhui Medical University Hefei 230022 China

In 1992,when the usage of laparoscopic cholecystectomy began to rise,Altman(1)published"When Patient's Life Is Price of Learning New Kind of Surgery"in The New York Times.

关键词： Surgery patients Times

Numerical and experimental study on the falling film flow characteristics with the effect of co-current gas flow in hydrogen liquefaction process

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Petroleum Science 2024年第2期21卷 1369-1384页

作者： Chong-Zheng Sun Yu-Xing Li Hui Han xiao-Yi geng xiao Lu College of Energy Storage Technology Shandong University of Science and TechnologyQingdao 266590ShandongChina College of Pipeline and Civil Engineering/Shandong Provincial Key Laboratory of Oil&Gas Storage and Transportation Safety China University of PetroleumQingdao 266580ShandongChina

Liquid hydrogen storage and transportation is an effective method for large-scale transportation and utilization of hydrogen energy. Revealing the flow mechanism of cryogenic working fluid is the key to optimize heat exchanger structure and hydrogen liquefaction process(LH2). The methods of cryogenic visualization experiment, theoretical analysis and numerical simulation are conducted to study the falling film flow characteristics with the effect of co-current gas flow in LH2spiral wound heat *** results show that the flow rate of mixed refrigerant has a great influence on liquid film spreading process, falling film flow pattern and heat transfer performance. The liquid film of LH2mixed refrigerant with column flow pattern can not uniformly and completely cover the tube wall surface. As liquid flow rate increases, the falling film flow pattern evolves into sheet-column flow and sheet flow, and liquid film completely covers the surface of tube wall. With the increase of shear effect of gas-phase mixed refrigerant in the same direction, the liquid film gradually becomes unstable, and the flow pattern eventually evolves into a mist flow.

关键词： Hydrogen liquefaction Spiral wound heat exchanger Flow pattern transition Falling film flow

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MD simulation of a copper rod under thermal shock

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Acta Mechanica Sinica 2010年第4期26卷 599-604页

作者： Rong-Hou Xia xiao-geng Tian Ya-Peng Shen MOE Key Laboratory for Strength andVibration Xi'an Jiaotong University Xi'an 710049 China Xi'an University of Technology Xi'an 710048 China

In this paper, thermoelastic problem of onedimensional copper rod under thermal shock is simulated using molecular dynamics method by adopting embedded atom method potential. The rod is on axis x, the left outermost surface of which is traction free and the right outermost surface is fixed. Free boundary condition is imposed on the outermost surfaces in direction y and z. The left and right ends of the rod are subjected to hot and cold baths, respectively. Temperature, displacement and stress distributions are obtained along the rod at different moments, which are shown to be limited in the mobile region, indicating that the heat propagation speed is limited rather than infinite. This is consistent with the prediction given by generalized thermoelastic theory. From simulation results we find that the speed of heat conduction is the same as the speed of thermal stress wave. In the present paper, the simulations are conducted using the large-scale atomic/molecular massively parallel simulator and completed visualization software.

关键词： Embedded atom method potential Molecular dynamics simulation Thermoelastic coupling Thermal stress

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Design of a CMOS Distributed Power Amplifier with Gradual Changed Gain Cells

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Chinese Journal of Electronics 2018年第6期27卷 1158-1162页

作者： ZHANG Ying LI Zeyou YANG Hua geng xiao ZHANG Yi College of Electronic and Optical Engineering College of Microelectronics Nanjing University of Posts and Telecommunications National and Local Joint Engineering Laboratory of RF Integration and Micro-Assembly Technology Nanjing University of Posts and Telecommunications

A non-uniform Distributed power amplifier(DPA) is designed and implemented in a 0.18μm CMOS technology. The gradual changed gain cells work with the tapered on-chip inductors to construct non-uniform artificial transmission lines, which improves the output power and efficiency in a wide frequency band while maintaining good input and output impedance matching. The proposed DPA achieves 9 dB average associated gain from 1 to 17.2 GHz, and the input return loss is less than--9 dB while the output return loss is less than-8.5 dB in the desired frequency band. The output power at 1 dB Output compression point(OP1 dB) is more than 7.8 dBm in the frequency band of 2-16 GHz, and the peak power-added efficiency is 6.2% with the OP1 dB12.6 dBm at 4 GHz.

关键词： Distributed amplifier Impedance matching Power added efficiency Artificial transmission line

Enhanced Special Drawing Rights＂ How China Could Contribute to a Reformed International Monetary Architecture

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China & World Economy 2018年第4期26卷 41-61页

作者： Matthew Harrison geng xiao Hong Kong Institute of International Finance China Peking University HSBC Business School China

Since the end of the Bretton Woods era, the world has operatea on a ae jacto system of free-floating exchange rates, with the US dollar as the dominant international currency. The system, characterized by large pro-cyclical capital flows and chronic imbalances, is inherently unstable, and has contributed to repeated crises, recessions and geopolitical tensions. One potentially ＂least-difficult＂ line of reform would be to allow the evolution of a multi-currency system, underpinned by an expanded role for Special Drawing Rights （SDRs）. Attempts to promote wider use of the SDR have foundered on the liquidity premium. However, for Chinese corporations and institutions, at present restricted in their capital account activities, the SDR liquidity premium would appear less daunting, The Chinese authorities eould provide policy encouragement for the use of SDRs by their institutions. This initiative, supported by China＇s Special Administrative Region Hong Kong, would kick-start an international SDR ecosystem, and encourage even broader use of SDRs, to the benefit of international monetary stability.

关键词： imbalances international monetary architecture monetary stability reform Special Drawing Rights

Traditional investigation and management for recurrent hemarthrosis after total knee arthroplasty: A case report

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World Journal of Clinical Cases 2020年第10期8卷 1966-1972页

作者： xiao geng Yang Li Xuan He Hua Tian Orthopedic Department Peking University Third HospitalBeijing 100191China

BACKGROUND Recurrent hemarthrosis is a rare complication of total knee arthroplasty,and only a few cases have been reported;hence,it is hard to establish comprehensive diagnosis and treatment *** here report a case of recurrent hemarthrosis after total knee arthroplasty,and briefly review the *** SUMMARY A 50-year-old man,with a history of hypertension,presented to the Orthopedic Department of our hospital for non-traumatic acute left knee pain and swelling associated with a warmth sensation 14 mo after total knee ***(ultrasound,aspiration,and arthroscopy)and managements(nonsurgical,arthroscopy and open exploration)were performed,and the clinical effects of these interventions were analyzed *** evidence indicates that the cause of this case was rupture of a pseudoaneurysm of the medial superior genicular *** The present case indicated that angiography is essential in cases of hemarthrosis after TKA;arthroscopy may not always be adequate as it may not provide a clear view;and traditional open exploration is still effective and sometimes necessary.

关键词： Total knee arthroplasty Recurrent hemarthrosis Arthroscopy Open exploration Case report

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涉税数据行为与个人信息安全保护研究

税务与经济 2025年第1期 43-51页

作者：孙璐伟耿晓北京大学法学院北京100871

大数据时代的税收征管需要利用涉税数据要素、依托涉税数据行为,但其中存在危害纳税人个人信息安全的诸多风险,如过度收集、非法使用、不当共享涉税数据和数据泄露等。只有对涉税数据行为与个人信息安全保护的内在联系展开深入研究和探... 详细信息

大数据时代的税收征管需要利用涉税数据要素、依托涉税数据行为,但其中存在危害纳税人个人信息安全的诸多风险,如过度收集、非法使用、不当共享涉税数据和数据泄露等。只有对涉税数据行为与个人信息安全保护的内在联系展开深入研究和探讨才能有效应对风险和破解难题,保障纳税人信息权利、规范涉税数据行为并助推大数据时代的税收法治现代化建设。为此,需要在解析纳税人信息权益面临的各风险类型和成因的基础上,立足“技术—制度”双向互动的视角提出务实的解决之策,包括修订《税收征管法》并优化相关法律制度的法治完善路径、充分保障纳税人信息权利束的权利落实路径和高质量建设智慧税务的技术支撑路径。

关键词：涉税数据涉税数据行为个人信息安全税收征管

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Deep learning framework for multi‐round service bundle recommendation in iterative mashup development

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CAAI Transactions on Intelligence Technology 2023年第3期8卷 914-930页

作者： Yutao Ma xiao geng Jian Wang Keqing He Dionysis Athanasopoulos School of Computer Science Wuhan UniversityWuhanChina School of Computer Science Central China Normal UniversityWuhanChina School of Electronics Electrical Engineering and Computer ScienceQueen's University BelfastBelfastUK

Recent years have witnessed the rapid development of service‐oriented computing *** boom of Web services increases software developers'selection burden in developing new service‐based systems such as *** recommending appropriate component services for developers to build new mashups has become a fundamental problem in service‐oriented software *** service recom-mendation approaches are mainly designed for mashup development in the single‐round *** is hard for them to effectively update recommendation results according to developers'requirements and behaviours(*** service selection).To address this issue,the authors propose a service bundle recommendation framework based on deep learning,DLISR,which aims to capture the interactions among the target mashup to build,selected(component)services,and the following service to ***,an attention mechanism is employed in DLISR to weigh selected services when rec-ommending a candidate *** authors also design two separate models for learning interactions from the perspectives of content and invocation history,respectively,and a hybrid model called *** on a real‐world dataset indicate that HISR can outperform several state‐of‐the‐art service recommendation methods to develop new mashups iteratively.

关键词： attention deep learning mashup development recommender systems service bundle

Ganoderic acid hinders renal fibrosis via suppressing TGF-β/Smad and MAPK signaling pathways

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中国药理学与毒理学杂志 2019年第10期 771-772页

作者： geng xiao-qiang Department of Pharmacology School of Basic Medical Sciences Peking University

OBJECTIVE To investigatethe anti-renal fibrotic effect of Ganoderic acid（GA） and the related mechanisms in vivo and in vitro. METHODS We investigated whether GA could hinder renal fibrosis and the related mechanisms in a unilateral ureteral obstruction（UUO） mouse model and TGF-β1-stimulated HK-2 cells model. The C57 mice were randomly devided into sham group, sham with GA administration group, UUO group and UUO with GA treatment group. After UUO surgery,the mice were treated with GA(3.125, 12.5 and 50 mg·kg;per day, ip) for 14 d. Then the mice were sacrificed for collecting blood and kidneys. The kidney functions were revealed by blood urea nitrogen and serum *** fibrosis and tubules injury levels were detected by Masson staining and HE staining. The epithelial-mesenchymal transition（EMT） level was detected by Western blotting and immunohistochemical staining. The changes of related signaling pathways and underlying mechanisms were demonstrated by Western blotting. The cell model was adopted to identify the potent inhibitor of renal fibrosis. RESULTS After 14 d treatment, GA dosedependently attenuated UUO-induced tubular injury and renal fibrosis; GA(50 mg·kg;) significantly ameliorated renal disfunction during fibrosis progression. We further revealed that GA treatment significantly decreased the expression of mesenchymal cell markers alpha-smooth muscle actin（α-SMA） and vimentin, and up-regulated E-cadherin expression in the kidney, suggesting the suppression of tubular EMT. Further study showed that GA downregulated both TGF-β/Smad and MAPK（ERK,JNK, P38） signaling pathways both in vivo and in ***-A, a GA monomer, was identified as a potent inhibitor on renal fibrosis in TGF-β1-stimulated HK-2 cell *** GA inhibits renal interstitial fibrosis induced by UUO, mostly by suppressing EMT progression and inhibiting TGF-β/Smad and MAPK signaling pathways. In conclusion, our results suggest that GA and its purified monomer GA-A might be develo

关键词： ganoderic acid chronic kidney disease renal fibrosis