检索结果-南通市图书馆

Fault-tolerant Control Design Based on Adaptive Dynamic Sliding Mode Technique for Near Space Vehicles

中华医学会第三届全国间质性肺病暨弥漫性泛细支气管炎学术会议

作者： Department of ICU,The Affiliated Hospital of Medical College of Chinese People’ s Armed Force Police,Tianjin 3001.2 LI Guo-qiang~1.ZHANG Yu-hua~1.WEI Lu-qing~1.lv Fang-fang~1.

Idiopathic pulmonary fibrosis is a chronic diffuse lung disease of unknown cause,and a risk factor for increasing morbidity and mortality after lung *** exacerbation of idiopathic pulmonary fibrosis after lung surgery...

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Fault-tolerant Control Design Based on Adaptive Dynamic Slid...

A fast forward computational method for nuclear measurement using volumetric detection constraints

第24届中国控制与决策会议

作者： Jing Zhao 1., Bin Jiang 1., and Peng Shi 2, 3, Xunhong lv 1.1. College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 21.01., China2. Department of Computing and Mathematical Sciences, University of Glamorgan, Pontypridd CF37 1.L, UK 3. School of Engineering and Science, Victoria University, Melbourne, Vic 8001. Australia

In this paper, a novel adaptive dynamic sliding mode （ADSM） fault-tolerant control （FTC） methodology is developed for near space vehicle attitude control systems with actuator faults. The proposed ADSM approach which combines dynamic sliding mode with adaptive control strategies can make the systems stable and accurately track the desired signals in presence of external disturbances, model parameter uncertainties and even actuator faults. Firstly, the faulty attitude dynamic model of X-33 is introduced, and then the ADSM control and fault-tolerant control laws are designed for outer-loop and inner-loop respectively. Finally, simulation results are provided to show the effectiveness of the proposed FTC scheme.

关键词： Fault Tolerant Control Adaptive Dynamic Sliding Mode Near Space Vehicles

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2024年第2期35卷 47-63页

作者： Qiong Zhang Lin-lv Lin University of Electronic Science and Technology of China Chengdu 610000China

Owing to the complex lithology of unconventional reservoirs,field interpreters usually need to provide a basis for interpretation using logging simulation *** the various detection tools that use nuclear sources,the detector response can reflect various types of information of the *** Monte Carlo method is one of the primary methods used to obtain nuclear detection responses in complex ***,this requires a computational process with extensive random sampling,consumes considerable resources,and does not provide real-time response ***,a novel fast forward computational method(FFCM)for nuclear measurement that uses volumetric detection constraints to rapidly calculate the detector response in various complex environments is ***,the data library required for the FFCM is built by collecting the detection volume,detector counts,and flux sensitivity functions through a Monte Carlo ***,based on perturbation theory and the Rytov approximation,a model for the detector response is derived using the flux sensitivity function method and a one-group diffusion *** environmental perturbation is constrained to optimize the model according to the tool structure and the impact of the formation and borehole within the effective detection ***,the method is applied to a neutron porosity tool for *** various complex simulation environments,the maximum relative error between the calculated porosity results of Monte Carlo and FFCM was 6.80%,with a rootmean-square error of 0.62 *** field well applications,the formation porosity model obtained using FFCM was in good agreement with the model obtained by interpreters,which demonstrates the validity and accuracy of the proposed method.

关键词： Nuclear measurement Fast forward computation Volumetric constraints

不同佐剂对猪圆环病毒衣壳蛋白免疫原性的影响

在线全文

学校读者我要写书评

暂无评论

中国畜牧兽医 2016年第11期43卷 3037-3046页

作者：王立波吴润生闫超吕暾福州大学生物科学与工程学院福州350116 福州大北农生物科技有限公司福州350014

试验旨在研究猪圆环病毒不同佐剂疫苗的制备及其对免疫原性的影响。将去除信号肽的PCV2(porcine circovirus type 2,PCV2)Cap蛋白基因连接在pET-28a载体上,进行诱导表达,用脱氧胆酸钠(DOC)和低浓度尿素对表达产物进行溶解,制备氢氧化铝... 详细信息

试验旨在研究猪圆环病毒不同佐剂疫苗的制备及其对免疫原性的影响。将去除信号肽的PCV2(porcine circovirus type 2,PCV2)Cap蛋白基因连接在pET-28a载体上,进行诱导表达,用脱氧胆酸钠(DOC)和低浓度尿素对表达产物进行溶解,制备氢氧化铝胶体佐剂、脂质体佐剂、弗氏佐剂、白油佐剂、蜂胶佐剂,并与纯化的PCV2-Cap蛋白混合制成亚单位疫苗,以商品化的灭活疫苗作为阳性对照,免疫小鼠,并使用ELISA方法检测动物血清中抗体及细胞因子含量的变化,评估其免疫保护效果。结果显示,表达产物以包涵体的形式存在,使用DOC溶解包涵体可省略蛋白复性步骤,且纯化方法简单,获得纯度较高的衣壳蛋白;ELISA检测结果表明PCV2-Cap蛋白能诱导产生特异性较高的抗体;水系佐剂制备的亚单位疫苗具有较高的免疫活性,为亚单位疫苗的商品化提供重要的数据支持。

关键词：猪圆环病毒包涵体佐剂亚单位疫苗

Fractures interaction and propagation mechanism of multi-cluster fracturing on laminated shale oil reservoir

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2024年第4期21卷 2600-2613页

作者： Jia-Xin lv Bing Hou Key Laboratory of Petroleum Engineering Ministry of Education China University of Petroleum (Beijing) State Key Laboratory of Petroleum Resources and Engineering China University of Petroleum (Beijing) Department of Petroleum Engineering China University of Petroleum (Beijing) at Karamay

The continental shale reservoirs of Jurassic Lianggaoshan Formation in Sichuan Basin contain thin lamina, which is characterized by strong plasticity and developed longitudinal shell limestone *** improve the production efficiency of reservoirs by multi-cluster fracturing, it is necessary to consider the unbalanced propagation of hydraulic fractures and the penetration effect of fractures. This paper constructed a numerical model of multi-fracture propagation and penetration based on the finite element coupling cohesive zone method; considering the construction cluster spacing, pump rate,lamina strength and other parameters studied the influencing factors of multi-cluster fracture interaction propagation; combined with AE energy data and fracture mode reconstruction method, quantitatively characterized the comprehensive impact of the strength of thin interlayer rock interfaces on the initiation and propagation of fractures that penetrate layers, and accurately predicted the propagation pattern of hydraulic fractures through laminated shale oil reservoirs. Simulation results revealed that in the process of multi-cluster fracturing, the proportion of shear damage is low, and mainly occurs in bedding fractures activated by outer fractures. Reducing the cluster spacing enhances the fracture system's penetration ability, though it lowers the activation efficiency of lamina. The high plasticity of the limestone interlayer may impact the vertical propagation distance of the main fracture. Improving the interface strength is beneficial to the reconstruction of the fracture height, but the interface communication effect is limited. Reasonable selection of layers with moderate lamina strength for fracturing stimulation, increasing the pump rate during fracturing and setting the cluster spacing reasonably are beneficial to improve the effect of reservoir stimulation.

关键词： Laminated shale Multi-cluster fracturing Cross-layer Cohesive zone model Acoustic emission technique

基于语料库的英源类词缀语义突显与文化顺涵研究

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

蚌埠学院学报 2017年第3期6卷 125-129页

作者：吕艳王中平南华大学外国语学院湖南衡阳421001 衡阳市第一高级中学湖南衡阳421001

基于"新词语研究资源库"所提供的新词频度与文本数,选取了典型英源类词缀与非典型英源类词缀进行案例分析。研究表明,英源类词缀受语法化认知机制与语言接触、语用功能的影响,既具源语认知意义上的延续性,又因语义突显和文化顺涵而彰显... 详细信息

基于"新词语研究资源库"所提供的新词频度与文本数,选取了典型英源类词缀与非典型英源类词缀进行案例分析。研究表明,英源类词缀受语法化认知机制与语言接触、语用功能的影响,既具源语认知意义上的延续性,又因语义突显和文化顺涵而彰显了汉民族性。

关键词：典型英源类词缀非典型英源类词缀语法化语义突显文化顺涵

Control of chiral-optical activities by magnetic field based on the transformation of achiral binary crystals into chiral ternary crystals

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第7期67卷 2300-2305页

作者： Zhiyan Chen Yan lv Wei Qin College of Physics Qingdao UniversityQingdao 266071China School of Physics State Key Laboratory of Crystal MaterialsShandong UniversityJinan 250100China Shandong Linuo Photovoltaic Hi-Tech Co. Ltd.Jinan 250100China

Multicomponent self-assembled chiral systems have attracted great attention due to their promising application in the area of spin-photonics and *** this work,through introducing an achiral third component into an achiral binary crystal,a chiral organic ternary crystal is fabricated,where both pronounced chiral-optical coupling and magnetic field dependence of chiral-optical activities are *** transformation of achiral structure into chiral structure generates a significant effect on the polarized state of light and the electron spin resonance ***,the coupling between circularly polarized photon and spin is observed in chiral ternary crystal with pronounced chiral orbit,where obvious magnetic field-transmissivity loop is ***,temperature could increase the magnitude of lattice parameters to lead to a larger helix radius to increase the chiral orbit ***,this work indicates that the further exploration of photon-chiral orbit-spin interactions in organic chiral ternary crystals is promising.

关键词： organic chiral ternary crystals chiral orbit chiral-optical activities magnetic field

Numerical Study on Local Flow and Heat Transfer Characteristics of Supercritical CO_(2) in PCHE with Sinusoidal Channels

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2024年第1期33卷 41-55页

作者： WENZhexi lv Yigao LI Qing WU Jinglin School of Energy Science and Engineering Central South UniversityChangsha 410083China

Local heat transfer and flow characteristics,which is crucial to the overall performance of supercritical CO_(2) recuperators,is rarely examined in details in reported *** this paper,the local heat transfer and flow characteristics of supercritical CO_(2) in sinusoidal channel printed circuit heat exchangers are numerically investigated under the working conditions of *** on the simplified physical model constituted by1. pitches,the variations of Re,heat flux,Nu,secondary flow and other relevant parameters along the flow direction are analyzed *** is further made between the high and low temperature recuperators(HTR and LTR).It's observed that the local heat transfer and flow characteristics vary greatly from the inlet to the outlet,especially in the *** of 1.7.5% and 61.7% can be observed on the cold side of the LTR for Re and heat transfer coefficient h, *** indicate that the temperature difference and heat transfer coefficient h should not be regarded as constant and the distribution of h should be carefully considered in the design of the *** complicated interactions among the varying thermophysical properties,buoyancy and the periodically changed centrifugal force are believed to be the key that shapes the flow ***,the changes of the wavy angle θ are found to have greater influence than the changes of mass flow rate in reshaping the flow field when θ>25°.Though gravity direction strongly affects the local heat transfer and flow characteristics,it's also found that the effects on the overall thermal-hydraulic performance are relatively *** the installation direction that yields a_y=g should better be avoided for the sinusoidal channel printed circuit heat exchanger.

关键词： printed circuit heat exchanger supercritical CO_(2) sinusoidal channel heat transfer recuperator

A Generalized MSST Algorithm for Counting Points of Elliptic Curves over F_(p)^(n)

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2024年第4期37卷 1738-1754页

作者： LI Xiao lv Chang PAN Zhizhong Key Laboratory of Cyberspace Security Defense Institute of Information EngineeringChinese Academy of SciencesBeijing 100085China School of Cyber Security University of Chinese Academy of SciencesBeijing 100085China Huawei Technologies Co. Ltd.Shenzhen 518129China

Elliptic curve cryptography is an important part of nowaday's public key *** points of elliptic curves over finite fields is of great significance to the selection of safety *** present,there are many p-adic algorithms,such as SST algorithm,generalized AGM algorithm,Kedlaya algorithm,etc.,which can deal with the situation of finite fields of small *** this paper,the authors generalize the MSST algorithm of characteristic 2 to general fields of odd characteristic,and propose the generalized MSST *** generalized MSST algorithm is achieved by combining the advantages of the SST algorithm and the generalized AGM *** the time complexity of the multiplication of two n-bit numbers is denoted as O((n)^(μ)),then the time complexity of the generalized MSST algorithm is O(n^(2μ+1.1.μ)),which is the same as the improved SST *** practical experiments,the running time of the generalized MSST algorithm is less than that of the improved SST algorithm.

关键词： Elliptic curve generalized AGM algorithm generalized MSST algorithm SST algorithm