检索结果-南通市图书馆

Efficient and robust CNN-LSTM prediction of flame temperature aided light field online tomography

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2024年第1期67卷 271-284页

作者： NIU ZhiTian QI hong sun AnTai REN YaTao HE MingJian GAO BaoHai School of Energy Science and Engineering Harbin Institute of TechnologyHarbin 150001China Key Laboratory of Aerospace Thermophysics Ministry of Industry and Information TechnologyHarbin 150001China

Light field tomography,an optical combustion diagnostic technology,has recently attracted extensive attention due to its easy implementation and ***,the conventional iterative methods are high data throughput,low efficiency and time-consuming,and the existing machine learning models use the radiation spectrum information of the flame to realize the parameter field measurement at the current *** is still an offline measurement and cannot realize the online prediction of the instantaneous structure of the actual turbulent combustion *** this work,a novel online prediction model of flame temperature instantaneous structure based on deep convolutional neural network and long short-term memory(CNN-LSTM)is *** method uses the characteristics of local perception,shared weight,and pooling of CNN to extract the threedimensional(3D)features of flame temperature and outgoing radiation ***,the LSTM is used to comprehensively utilize the ten historical time series information of high dynamic combustion flame to accurately predict 3D temperature at three future moments.A chaotic time-series dataset based on the flame radiation forward model is built to train and validate the performance of the proposed CNN-LSTM *** is proven that the CNN-LSTM prediction model can successfully learn the evolution pattern of combustion flame and make accurate predictions.

关键词： temperature prediction convolutional neural network long short-term memory light field imaging online tomography

Persistent greening against drying in northeast Asian semiarid grasslands:Asymmetrical responses of direct and legacy effects to intensified drought

在线全文

学校读者我要写书评

暂无评论

Advances in Climate Change Research 2024年第1期15卷 9-20页

作者： Yu-Tong MA Hai-Shan CHEN Yao-Ming SONG Bo-Tao ZHOU Shan-Lei sun Xin-Guan DU yue sun Key Laboratory of Meteorological Disaster Ministry of Education/Joint International Research Laboratory of Climate and Environment Change/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science and TechnologyNanjing 210044China School of Atmospheric Sciences Nanjing University of Information Science and TechnologyNanjing 210044China

Despite experiencing a decadal shift towards drought conditions at the end of the 2Oth century,semiarid grasslands in northeast Asia(NEA)exhibited an evident greening trend from 1982 to ***,the mechanism behind this phenomenon remains ***,we analysed the interdecadal changes in vegetation response to drought on the basis of the standardised precipitation evapotranspiration index(SPEI)and Global Inventory Modelling and Mapping Studies LAI4g datasets,with an emphasis on the differences between direct and legacy effects(as measured by resilience),to explore the mechanism of persistent grassland *** revealed that during the post-drought shift period(2000-2020),the sudden decrease in the water content of the intermediate soil layer triggered an intensified vegetation response to ***,although direct effects and resilience were amplified,they exhibited asymmetric *** was stronger than direct effects,and this difference increased with increasing drought(drought recovery)*** combined effects may account for persistent greening against intensified drying in the semiarid grasslands in *** the projected exacerbation of future droughts,this study holds notable importance for comprehending the long-term change dynamics of dryland ecosystems.

关键词： Semiarid grassland Drought decadal shift Direct effect Legacy effect(resilience) Northeast Asia

Hydrometallurgical recovery of lithium carbonate and iron phosphate from blended cathode materials of spent lithium-ion battery

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2024年第3期43卷 1275-1287页

作者： Shao-Le Song Run-Qing Liu Miao-Miao sun Ai-Gang Zhen Fan-Zhen Kong yue Yang School of Minerals Processing and Bioengineering Central South UniversityChangsha410083China Zhejiang Tianneng New Materials Co. Ltd.Huzhou313103China

The recycling of cathode materials from spent lithium-ion battery has attracted extensive attention,but few research have focused on spent blended cathode *** reality,the blended materials of lithium iron phosphate and ternary are widely used in electric vehicles,so it is critical to design an effective recycling *** this study,an efficient method for recovering Li and Fe from the blended cathode materials of spent LiFePO_(4)and LiNi_(x)Co_(y)Mn_(1-x-y)O_(2)batteries is ***,87%A1 was removed by alkali ***,91.65%Li,72.08%Ni,64.6%Co and 71.66%Mn were further separated by selective leaching with H_(2)SO_(4)and H_(2)O_(2).Li,Ni,Co and Mn in solution were recovered in the form of Li_(2)CO_(3)and hydroxide ***,98.38%Fe was leached from the residue by two stage process,and it is recovered as FePO_(4)·2H_(2)O with a purity of 99.5%by *** and P were present in FePO_(4)·2H_(2)O in amounts of 28.34%and 15.98%,***,the drift and control of various components were discussed,and cost-benefit analysis was used to assess the feasibility of potential application.

关键词： Spent lithium-ion battery Blended cathode materials Recovery Lithium carbonate Iron phosphate

Frequency-comb-linearized, widely tunable lasers for coherent ranging

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2024年第4期12卷 663-681页

作者： BAOQI SHI YI-HAN LUO WEI sun yue HU JINBAO LONG XUE BAI ANTING WANG JUNQIU LIU Department of Optics and Optical Engineering University of Science and Technology of ChinaHefei 230026China International Quantum Academy Shenzhen 518048China Shenzhen Institute for Quantum Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China

Tunable lasers,with the ability to continuously vary their emission wavelengths,have found widespread applications across various fields such as biomedical imaging,coherent ranging,optical communications,and *** these applications,a wide chirp range is advantageous for large spectral coverage and high frequency ***,the frequency accuracy and precision also depend critically on the chirp linearity of the *** extensive efforts have been made on the development of many kinds of frequency-agile,widely tunable,narrow-linewidth lasers,wideband yet precise methods to characterize and linearize laser chirp dynamics are also *** we present an approach to characterize laser chirp dynamics using an optical frequency *** instantaneous laser frequency is tracked over terahertz bandwidth at 1 MHz *** this approach we calibrate the chirp performance of 12 tunable lasers from Toptica,Santec,New Focus,EXFO,and NKT that are commonly used in fiber optics and integrated *** addition,with acquired knowledge of laser chirp dynamics,we demonstrate a simple frequency-linearization scheme that enables coherent ranging without any optical or electronic linearization *** approach not only presents novel wideband,highresolution laser spectroscopy,but is also critical for sensing applications with ever-increasing requirements on performance.

关键词： tunable Focus coherent

Abnormal Innervation,Demyelination,and Degeneration of Spiral Ganglion Neurons as Well as Disruption of Heminodes are Involved in the Onset of Deafness in Cx26 Null Mice

在线全文

学校读者我要写书评

暂无评论

Neuroscience Bulletin 2024年第8期40卷 1093-1103页

作者： yue Qiu Le Xie Xiaohui Wang Kai Xu Xue Bai Sen Chen Yu sun Department of Otorhinolaryngology Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022China Department of Otolaryngology Nanchang UniversityNanchang 330006China

GJB2 gene mutations are the most common causes of autosomal recessive non-syndromic hereditary *** individuals suffering from severe to profound GJB2-related deafness,cochlear implants have emerged as the sole remedy for auditory *** previous studies have highlighted the crucial role of preserving cochlear neural components in achieving favorable outcomes after cochlear ***,we generated a conditional knockout mouse model(Cx26-CKO)in which Cx26 was completely deleted in the cochlear supporting cells driven by the Sox2 *** Cx26-CKO mice showed severe hearing loss and massive loss of hair cells and Deiter’s cells,which represented the extreme form of human deafness caused by GJB2 gene *** addition,multiple pathological changes in the peripheral auditory nervous system were found,including abnormal innervation,demyelination,and degeneration of spiral ganglion neurons as well as disruption of heminodes in Cx26-CKO *** findings provide invaluable insights into the deafness mechanism and the treatment for severe deafness in Cx26-null mice.

关键词： Spiral ganglion neurons Gjb2 Heminode Hearing loss

空气溶入与扩散对高扬程虹吸管内空气积累影响(英文)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2015年第9期16卷 760-768页

作者： yue-liang CAI hong-yue sun yue-quan SHANG Zhi-jun WU College of Civil Engineering and Architecture Zhejiang University Ocean College Zhejiang University

目的:探索长时间停流情况下高扬程虹吸管中空气累积现象的发生发展及其对虹吸持续工作的危害,并给出应对该现象的工程预防措施。创新点:利用物理模型实验,结合理论解析推导,得到高扬程虹吸管内空气累积的原因及关键影响因素,突破高扬程... 详细信息

目的:探索长时间停流情况下高扬程虹吸管中空气累积现象的发生发展及其对虹吸持续工作的危害,并给出应对该现象的工程预防措施。创新点:利用物理模型实验,结合理论解析推导,得到高扬程虹吸管内空气累积的原因及关键影响因素,突破高扬程虹吸排水在少雨地区的使用局限,给出其长期适用的工程设计条件,对其在实际边坡工程中的推广应用提供理论技术指导。方法:通过物理模型试验,揭示长期停流虹吸管内出现空气累积的必然性;利用理论公式推导,对不同因素的影响结果进行对比分析,得出影响空气累积的主要因素。结论:1.溶于水的空气因压力降低而析出、管端空气溶入扩散到虹吸管顶部及温度变化引起空气析出等现象是无法避免的;其中,原有空气的析出及温度变化引起的空气累积是主要因素;2.边坡虹吸排水设计时进水端口距控制水位至少应预留2.05 m的地下水位上升余量,或者保持出水口的高程比进水口高程低4.1 m来保证析出空气段处于下水管中。

关键词：边坡虹吸排水旱季停流空气累积气体扩散温度

在线全文

学校读者我要写书评

暂无评论

边坡高扬程虹吸排水管流态特征研究(英文)

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2014年第1期15卷 22-30页

作者： yue-liang CAI hong-yue sun yue-quan SHANG Xiao-liang XIONG College of Civil Engineering and Architecture Zhejiang University Ocean College Zhejiang University

研究目的:从实验及理论角度阐述边坡高扬程虹吸排水容易断流造成虹吸中断的原因,并提供解决方案,实现虹吸排水的长期有效。创新要点:利用物理模型实验,结合理论解析推导,得到了高扬程虹吸排水管顶部流态特征及其与管径的关系,解决了高... 详细信息

研究目的:从实验及理论角度阐述边坡高扬程虹吸排水容易断流造成虹吸中断的原因,并提供解决方案,实现虹吸排水的长期有效。创新要点:利用物理模型实验,结合理论解析推导,得到了高扬程虹吸排水管顶部流态特征及其与管径的关系,解决了高扬程虹吸排水容易断流造成虹吸中断问题,保证了虹吸排水技术在边坡治理工程中的长期有效性。研究方法:通过物理模型试验,揭示虹吸水流经过管顶区段的三种流型特征(见图4);利用热力学理论推导,得到了虹吸水流经过管顶区段由贴壁流向弹状流转变的临界管径,见公式(23)。重要结论:管中形成气液共同移动的完整弹状流是实现虹吸排水长期稳定的关键,虹吸水流经过管顶区段由贴壁流向弹状流转变时存在临界管径。保证边坡工程中虹吸排水长期稳定的管径以3.6 mm为宜。

关键词：虹吸排水贴壁流弹状流虹吸管径液面形状

Evicting and filling attack for linking multiple network addresses of Bitcoin nodes

在线全文

学校读者我要写书评

暂无评论

Cybersecurity 2024年第3期7卷 49-68页

作者： Huashuang Yang Jinqiao Shi yue Gao Xuebin Wang Yanwei sun Ruisheng Shi Dongbin Wang School of Cyberspace Security Bejing University of Posts and TelecommunicationsBeijingChina Tsinghua University Bejing 100084China Institute of Information Engineering Chinese Academy of SciencesBeijingChina

Bitcoin is a decentralized P2P *** supports users to use pseudonyms instead of network addresses to send and receive transactions at the data layer,hiding users'real network *** transaction tracing attack cuts through the network layer to directly associate each transaction with the network address that issued it,thus revealing the sender's network *** this attack can be mitigated by Bitcoin's network layer privacy *** Bitcoin protects the unlinkability of Bitcoin addresses and there may be a many-to-one relation-ship between addresses and nodes,transactions sent from the same node via different addresses are seen as com-ing from different nodes because attackers can only use addresses as node *** this paper,we proposed the evicting and flling attack to expose the correlations between addresses and cluster transactions sent from different addresses of the same *** attack exploited the unisolation of Bitcoin's incoming connection processing *** particular,an attacker can utilize the shared connection pool and deterministic connection eviction strategy to infer the correlation between incoming and evicting connections,as well as the correlation between releasing and flling *** on inferred results,different addresses of the same node with these connections can be linked together,whether they are of the same or different network *** designed a multi-step attack procedure,and set reasonable attack parameters through analyzing the factors that affect the attack effciency and *** mounted this attack on both our self-run nodes and multi-address nodes in real Bitcoin network,achieving an aver-age accuracy of 96.9% and 82%,***,we found that the attack is also applicable to Zcash,Litecoin,Dogecoin,Bitcoin Cash,and *** analyzed the cost of network-wide attacks,the application scenario,and proposed countermeasures of this attack.

关键词： Security and privacy Bitcoin Address linking

Prognosis and outcome of intrauterine treatment of fetuses with critical congenital heart disease

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Medical Journal 2024年第12期137卷 1431-1436页

作者： Liqing Zhao Lei Wang hongping Xia Yurong Wu Xianting Jiao hong Zhu sun Chen Kun sun Department of Pediatric Cardiology Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghai 200092China Department of Diagnosis and Treatment Center for in utero Pediatric Disease Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghai 200092China Department of Neonatology Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghai 200092China

Background:Intrauterine valvuloplasty is an innovative therapy,which promotes ventricular growth and function in some congenital heart diseases(CHDs).The technique remains challenging and can only be performed in a few *** study aimed to assess the feasibility and mid-term outcomes of fetal cardiac intervention(FCI)in fetuses with critical CHD in an experienced tertiary ***:Five fetal aortic valvuloplasty(FAV)or fetal pulmonary valvuloplasty(FPV)procedures were performed in our fetal heart center between August 2018 and May *** success was defined as crossing the aortic or pulmonary valve and balloon inflation,followed by evidence of increased blood flow across the valve and/or new ***-up clinical records and echocardiography were obtained during the prenatal and postnatal ***:Five fetuses received FAV or FPV,including critical aortic stenosis(n=2)and pulmonary atresia with intact ventricular septum(n=3).The mean maternal age was 33.0±2.6 *** median gestational age(GA)at diagnosis was 24 weeks(range,22-26 weeks).The median GA at intervention was 29 weeks(range,28-32 weeks).All five cases underwent successful or partially successful *** patient had pulmonary valve perforation without balloon *** procedure-related deaths or significant complications ***,one neonatal death occurred due to heart and renal *** median follow-up period was 29.5 months(range,8.0-48.0 months).The four surviving patients had achieved biventricular circulation,exhibited improved valve,and ventricular development at the last follow-up ***:Intrauterine FCI could be performed safely with good prognosis in critical CHD.

关键词： Fetal cardiac intervention Valvuloplasty Pulmonary atresia Critical aortic stenosis Congenital heart disease