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Optimal structural design for a certain near-space composite propeller of airship using adaptive region division blending model

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Chinese Journal of Aeronautics 2024年第5期37卷 301-316页

作者： Weigang AN tianyu lin Shigen WANG School of Aeronautics Northwestern Polytechnical UniversityXi’an 710072China

Near-space airship is a frontier and hotspot in current military research and development,and the near-space composite propeller is the key technology for its *** order to obtain higher aerodynamic efficiency at an altitude of 22 km,a certain near-space composite propeller is designed as a long and slender aerodynamic shape with a 10 m diameter,which brings many challenges to the composite structure *** initial design is obtained by the composite structure variable stiffness design method using based on fixed region division blending ***,it weighs 23.142 kg,exceeding the required 20 *** order to meet the structural design requirements of the propeller,a variable stiffness design method using the adaptive region division blending model is proposed in this *** with the methods using the fixed region division blending model,this method optimizes region division,stacking thickness and stacking sequence in a single level,considering the coupling effect among *** a more refined region division,this method can provide a more optimal design for composite tapered ***,to improve the efficiency of optimization subjected to manufacturing constraints,a hierarchical penalty function is proposed to quickly filter out the solutions that do not meet manufacturing *** above methods combined with a Genetic Algorithm(GA)using specific encoding are adopted to optimize the near-space composite *** optimal design of the structure weighs 18.831 kg,with all manufacturing constraints and all structural response constraints being *** with the initial design,the optimal design has a more refined region division,and achieves a weight reduction of 18.6%.This demonstrates that a refined region division can significantly improve the mechanical performance of the composite tapered structure.

关键词： Structural optimization Composite tapered structure Genetic algorithm Adaptive region division Manufacturing constraint Near-space composite propeller

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砂土地基中螺旋锚上拔承载特性试验与理论研究

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岩土工程学报 2024年第8期46卷 1582-1595页

作者：胡伟林天宇林志冯世进 IVAN Puig Damians 岩土工程稳定控制与健康监测湖南省重点实验室湖南湘潭411201 福建省高速公路融通投资有限公司福建福州350005 同济大学地下建筑与工程系上海200092 Department of Civil and Environmental Engineering(DECA) School of Civil EngineeringUniversitat Politècnica de Catalunya-BarcelonaTech(UPC)Jordi Girona 1-308034 Barcelona

目前多锚片螺旋锚上拔承载的理论研究需人为引入临界埋深比和临界间距比的概念,这将一个连续演化问题割裂成多种特殊工况,但两个临界值的取值标准又存在不统一的问题,导致理论的工程应用存在风险。基于模型试验并结合数字照相测量技术... 详细信息

目前多锚片螺旋锚上拔承载的理论研究需人为引入临界埋深比和临界间距比的概念,这将一个连续演化问题割裂成多种特殊工况,但两个临界值的取值标准又存在不统一的问题,导致理论的工程应用存在风险。基于模型试验并结合数字照相测量技术开展砂土地基中螺旋锚上拔承载特性研究,主要得到以下结论:①单、双锚片螺旋锚上拔荷载位移曲线的变化均可分为增长区间和震荡下降区间两个阶段,埋深比越大,荷载峰值越高,但随之增强的土拱效应也导致曲线震荡幅度越显著。②抗拔承载力突破因子Nγ随埋深比的变化曲线存在峰值特征,先快速增大后缓慢减小;下层锚承载力发挥系数η随间距比的增大呈先快后缓的增加趋势。③多锚片螺旋锚的各层锚片对应的破坏滑动面均可用随埋深比增大长短轴比逐渐减小的椭圆来刻画,首层锚滑动面与同埋深下单锚片滑动面形态一致,下层锚滑动面的椭圆长短轴之比受到间距比变化的影响可分为3个阶段。④多锚片螺旋锚的首层锚和下层锚各自有3种滑动面工况,对应3种力学模型,这取决于埋深比和间距比,螺旋锚总的上拔承载力学模型由它们组合而成。⑤推导建立了多锚片螺旋锚上拔承载力计算方法,该方法可以考虑任意锚片数量、埋深比和间距比,并通过对4个松砂和中密砂地基中试验案例的计算验证了该方法的有效性。

关键词：螺旋锚埋深比间距比抗拔承载力承载力发挥系数滑动面

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Robotic single-incision left hemihepatectomy for intrahepatic bile duct stones by Da Vinci single-site surgical system: A case report with video

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Laparoscopic, Endoscopic and Robotic Surgery 2021年第3期4卷 90-92页

作者： Xiao Liang Junhao Zheng Jiaqi Gao Yubin Sheng tianyu lin Xiujun Cai Department of General Surgery Sir Run Run Shaw HospitalZhejiang University School of MedicineHangzhou 310016China Key Laboratory of Laparoscopic Technology of Zhejiang Province Hangzhou 310016China Zhejiang Minimal Invasive Diagnosis and Treatment Technology Research Center of Severe Hepatobiliary Disease Hangzhou 310016China Zhejiang Research and Development Engineering Laboratory of Minimally Invasive Technology and Equipment Hangzhou 310016China Zhejiang University Cancer Center Hangzhou 310058China

Minimally invasive surgery is a trend in hepatobiliary surgery.A 56-year-old female patient was admitted to our institution for intrahepatic *** CT scan showed multiple calculi in the left liver,dilation of the left intrahepatic bile duct and liver atrophy of the left *** single-incision left hemihepatectomy by the single-site systemwas successfully *** the idea of enhanced recovery after surgery,the patient was discharged on the third day after the operation without any *** single-incision surgery is more frequent in gynecologic and urological *** far as we know,this is the first robotic single-incision left hemihepatectomy report in the world.

关键词： Robotic liver resection Single-incision surgery Video case

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Organic heterojunction synaptic device with ultra high recognition rate for neuromorphic computing

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Nano Research 2024年第6期17卷 5614-5620页

作者： Xuemeng Hu Jialin Meng Tianyang Feng tianyu Wang Hao Zhu Qingqing Sun David Wei Zhang lin Chen School of Microelectronics State Key Laboratory of Integrated Chips and SystemsFudan UniversityShanghai 200433China National Integrated Circuit Innovation Center Shanghai 201203China

Traditional computing structures are blocked by the von Neumann bottleneck,and neuromorphic computing devices inspired by the human brain which integrate storage and computation have received more and more ***,a flexible organic device with 2,7-dioctyl[1]benzothieno[3,2-b][1]benzothiophene(C8-BTBT)and 2,9-didecyldinaphtho[2,3-b:2′,3′-f]thieno[3,2-b]thiophene(C10-DNTT)heterostructural channel having excellent synaptic behaviors was fabricated on muscovite(MICA)substrate,which has a memory window greater than 20 *** device shows better electrical characteristics than organic field effect transistors with single organic semiconductor ***,the device simulates organism synaptic behaviors successfully,such as paired-pulse facilitation(PPF),long-term potentiation/depression(LTP/LTD)process,and transition from short-term memory(STM)to long-term memory(LTM)by optical and electrical ***,the neuromorphic computing function was verified using the Modified National Institute of Standards and Technology(MNIST)pattern recognition,with a recognition rate nearly 100%without *** research proposes a flexible organic heterojunction with the ultra-high recognition rate in MNIST pattern recognition and provides the possibility for future flexible wearable neuromorphic computing devices.

关键词： organic heterojunction neuromorphic computing synapse behaviors optical modulation Modified National Institute of Standards and Technology(MNIST)pattern recognition

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Transdermal treatment for malignant melanoma by aptamer-modified tetrahedral framework nucleic acid delivery of vemurafenib

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Chinese Chemical Letters 2024年第4期35卷 260-267页

作者： Dexuan Xiao tianyu Chen Tianxu Zhang Sirong Shi Mei Zhang Xin Qin Yunkun Liu Longjiang Li Yunfeng lin State Key Laboratory of Oral Diseases National Clinical Research Center for Oral DiseasesWest China Hospital of StomatologySichuan UniversityChengdu 610041China Sichuan Provincial Engineering Research Center of Oral Biomaterials Chengdu 610041China Department of Head and Neck Oncology National Clinical Research Center for Oral DiseasesWest China Hospital of StomatologySichuan UniversityChengdu 610041China

Melanoma is one of the most malignant skin tumors, whose high invasion is generally associated with BRAF gene mutation. Although new chemotherapeutic drugs, such as vemurafenib, have been developed to inhibit the growth of melanoma, these drugs are usually administered intravenously or orally, resulting in toxic side effects on major tissues and organs. Tetrahedral framework nucleic acids(tFNAs) are a novel type of DNA nanostructures with excellent biocompatibility and versatility which have been proven to penetrate through skin barrier with ease. In this study, we prepared t FNAs with vemurafenib and connected DNA aptamer AS1411 at the apex of t FNAs(AS1411-tFNAs/vemurafenib). On one hand, AS1411-tFNAs/vemurafenib could kill melanoma cells by blocking the mutated BRAF gene in vitro. Compared with free vemurafenib, AS1411-tFNAs/vemurafenib had no obvious toxicity to normal cells. On the other hand,AS1411-tFNAs could transfer vemurafenib to cross through the skin barrier and permeate into tumor tissues. In vivo, transdermal delivery of AS1411-t FNAs/vemurafenib could inhibit the growth of human A375melanoma, whose inhibiting effect was stronger than intravenous administration of vemurafenib. These results demonstrated the application prospects of tFNAs combined with chemotherapeutic drugs in skin tumors.

关键词： Melanoma Vemurafenib DNA nanostructure Transdermal treatment Side effect

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InGaZnO-based photoelectric synaptic devices for neuromorphic computing

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Journal of Semiconductors 2024年第9期45卷 42-47页

作者： Jieru Song Jialin Meng tianyu Wang Changjin Wan Hao Zhu Qingqing Sun David Wei Zhang lin Chen School of Microelectronics State Key Laboratory of Integrated Chips and SystemsFudan UniversityShanghai 200433China School of Integrated Circuits Shandong UniversityJinan 250100China National Integrated Circuit Innovation Center Shanghai 201203China School of Electronic Science and Engineering Nanjing UniversityNanjing 210023China Jiashan Fudan Institute Jiashan 314102China

Photoelectric synaptic devices could emulate synaptic behaviors utilizing photoelectric effects and offer promising prospects with their high-speed operation and low crosstalk. In this study, we introduced a novel InGaZnO-based photoelectric memristor. Under both electrical and optical stimulation, the device successfully emulated synaptic characteristics including excitatory postsynaptic current (EPSC), paired-pulse facilitation (PPF), long-term potentiation (LTP), and long-term depression (LTD). Furthermore, we demonstrated the practical application of our synaptic devices through the recognition of handwritten digits. The devices have successfully shown their ability to modulate synaptic weights effectively through light pulse stimulation, resulting in a recognition accuracy of up to 93.4%. The results illustrated the potential of IGZO-based memristors in neuromorphic computing, particularly their ability to simulate synaptic functionalities and contribute to image recognition tasks.

关键词： InGaZnO artificial synapse neuromorphic computing photoelectric memristor

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Chiral Pair Density Waves with Residual Fermi Arcs in RbV3Sb5

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Chinese Physics Letters 2024年第9期41卷 88-92页

作者： Xiao-Yu Yan Hanbin Deng tianyu Yang Guowei Liu Wei Song Hu Miao Zhijun Tu Hechang Lei Shuo Wang Ben-Chuan lin Hailang Qin Jia-Xin Yin Department of Physics Southern University of Science and TechnologyShenzhen 518055China Materials Science and Technology Division Oak Ridge National LaboratoryOak RidgeTennessee 37831USA Beijing Key Laboratory of Optoelectronic Functional Materials MicroNano Devices Department of PhysicsRenmin University of ChinaBeijing 100872China Key Laboratory of Quantum State Construction and Manipulation(Ministry of Education) Renmin University of ChinaBeijing 100872China Shenzhen Institute for Quantum Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Guangdong Provincial Key Laboratory of Quantum Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area Shenzhen 518055China

The chiral 2×2 charge order has been reported and confirmed in the kagome superconductor RbV3Sb5,while its interplay with superconductivity remains elusive owing to its lowest superconducting transition temperature Tc of about 0.85K in the AV3Sb5 family(A=K,Rb,Cs)that severely challenges electronic spectroscopic ***,utilizing dilution-refrigerator-based scanning tunneling microscopy down to 30 mK,we observe chiral 2×2 pair density waves with residual Fermi arcs in *** find a superconducting gap of 150eV with substantial residual in-gap *** spatial distribution of this gap exhibits chiral 2×2 modulations,signaling a chiral pair density wave(PDW).Our quasi-particle interference imaging of the zero-energy residual states further reveals arc-like *** discuss the relation of the gap modulations with the residual Fermi arcs under the space-momentum correspondence between PDW and Bogoliubov Fermi states.

关键词： Fermi chiral utilizing

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十二指肠胃肠间质瘤外科治疗的艰难选择:胰十二指肠切除还是局部切除

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中华胃肠外科杂志 2020年第9期23卷 861-865页

作者：钱浩然林天宇浙江大学医学院附属邵逸夫医院普通外科浙江大学微创外科研究所杭州310016

十二指肠胃肠间质瘤(GIST)由于其处于特殊的解剖学部位,它的治疗方式选择一直是外科医生关注的重点。目前为止,原发性十二指肠GIST首选治疗方法还是手术切除,包括局部手术切除和胰十二指肠切除。研究认为,十二指肠GIST预后取决于肿瘤自... 详细信息

十二指肠胃肠间质瘤(GIST)由于其处于特殊的解剖学部位,它的治疗方式选择一直是外科医生关注的重点。目前为止,原发性十二指肠GIST首选治疗方法还是手术切除,包括局部手术切除和胰十二指肠切除。研究认为,十二指肠GIST预后取决于肿瘤自身病理学因素,与手术方式无明显相关,而靶向药物如伊马替尼的强势介入,让十二指肠GIST拥有更多局部切除的机会。双镜技术及机器人技术的发展将为十二指肠GIST的局部微创治疗开启新的纪元。

关键词：胃肠间质瘤,十二指肠胰十二指肠切除局部切除伊马替尼

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重复频率微秒脉冲电压下多间隙气体开关级间绝缘子沿面闪络特性

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高电压技术 2022年第12期48卷 4780-4790页

作者：林天煜李舟李巍王雨王宁杨兰均西安交通大学电气工程学院电力设备电气绝缘国家重点实验室西安710049 国网陕西省电力公司西安供电公司西安710032

多级间隙气体开关是高功率微波装置中的关键器件,其中级间绝缘子沿面绝缘强度是影响开关稳定性和寿命的关键因素之一。文中模拟级间绝缘子实际工作条件,对平行平板电极中的圆柱形绝缘子试样施加重频微秒脉冲电压,开展闪络电压、闪络时... 详细信息

多级间隙气体开关是高功率微波装置中的关键器件,其中级间绝缘子沿面绝缘强度是影响开关稳定性和寿命的关键因素之一。文中模拟级间绝缘子实际工作条件,对平行平板电极中的圆柱形绝缘子试样施加重频微秒脉冲电压,开展闪络电压、闪络时延以及沿面寿命的实验研究。结果表明:气/固介电常数差异加剧电场畸变,使得闪络电压随着绝缘子材料介电常数增大而降低,SF_(6)中不同材料闪络电压的差异小于空气中;由于累积效应,闪络电压和闪络时延随着重复频率增加整体呈下降趋势;相同欠压比下,绝缘子沿面寿命随着气压升高而增长,SF_(6)中沿面寿命高空气中一个数量级,介电常数较大的材料具有更优异的沿面寿命;SF_(6)与空气闪络路径的差异导致SF_(6)中沿面闪络特性具有与空气中不同的特点,闪络放电分散性低于空气中,重频脉冲作用下材料表面光电发射作用更为显著,连续闪络中劣化猝发等。该研究为级间绝缘子沿面绝缘设计和绝缘材料筛选提供了理论依据。

关键词：级间绝缘子重频微秒脉冲沿面闪络沿面寿命闪络路径

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重频纳秒脉冲电压下聚酰亚胺薄膜层叠结构的绝缘特性

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高电压技术 2021年第2期47卷 695-704页

作者：喻梦晗杨兰均林天煜张永鹏刘刚丁健西安交通大学电力设备电气绝缘国家重点实验室西安710049 宁波送变电建设有限公司甬城配电网建设分公司宁波315000

为提高脉冲功率技术中绝缘结构的绝缘性能,延长设备使用寿命,研究了重频纳秒脉冲电压作用下,多层绝缘薄膜层叠结构的绝缘特性,采用上升时间为115 ns、脉宽为225 ns的重频源,在重复频率为1 kHz的条件下,对比了不同厚度和层叠数的聚酰亚... 详细信息

为提高脉冲功率技术中绝缘结构的绝缘性能,延长设备使用寿命,研究了重频纳秒脉冲电压作用下,多层绝缘薄膜层叠结构的绝缘特性,采用上升时间为115 ns、脉宽为225 ns的重频源,在重复频率为1 kHz的条件下,对比了不同厚度和层叠数的聚酰亚胺单层膜和多层膜的短时击穿场强和长时耐受脉冲数,建立了重频纳秒脉冲电压下1500万次以内的电老化单因子寿命模型。试验结果表明层叠结构有利于提高聚酰亚胺的绝缘强度,快速击穿场强最高增大45.44%,这是由于层叠结构减小了单层绝缘厚度,单层绝缘的击穿场强随厚度的减小而增大。耐受脉冲电压数也明显提升,并且总绝缘厚度相同的情况下分层数越多,快速击穿场强越高,同时耐受脉冲数也越多。耐受脉冲电压数与场强满足指数关系,这为场强的选择和绝缘结构设计提供了依据。

关键词：重频纳秒脉冲薄膜绝缘层叠结构击穿场强寿命模型

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