检索结果-南通市图书馆

Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 156-168页

作者： Yifeng Li Zhuoran Yang Ziming Yan Huibin shi Zhanli Liu Kaijie Wang Department of Engineering Mechanics School of Aerospace Engineering Tsinghua University Beijing Tongren Eye Center Beijing Tongren Hospital Capital Medical University Beijing Ophthalmology & Visual Sciences Key Lab

Orthokeratology(OK) is widely used for effective myopia correction and control. However, the incomplete understanding of its biomechanical mechanisms makes OK lens fitting rely heavily on clinician judgment, complicating accurate predictions of treatment outcomes. In this paper, we performed clinical experiments and numerical analysis to study corneal deformation modes and long-term changes in central corneal thickness. Clinical experiments were conducted on 194 Chinese myopic patients under OK treatment for 3 months. Based on the experimental data, a patient-specific computational biomechanical model for OK was established and validated. Specifically, the anisotropic mechanical properties of the cornea were incorporated into the model to describe the significant difference between its shear modulus(29.5 kPa) and tensile modulus(768.4 kPa). Additionally, a viscohyperelastic material model with a prolonged corneal relaxation time of 5.6 h was developed to capture the long-term deformation response. The results show that corneal thickness reduction in OK is primarily due to out-of-plane shear deformation,influenced by the cornea's low shear resistance. Modeling the extended corneal relaxation time is crucial for predicting long-term biomechanical responses. The computational model effectively captures long-term changes in central corneal thickness, potentially improving OK lens fitting accuracy.

关键词：

A New Zircon U-Pb Age of 107.15 Ma for the Dongshan Formation, Boli Basin, Northeast China

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2020年第2期94卷 568-571页

作者： ZHANG Sheng FANG shi SHAO Hongjun WANG Silin zhao yun PING Shuaifei College of Earth Sciences Jilin UniversityChangchun 130061China Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanisms Ministry of EducationBeijing 100083China Key Laboratory for Evolution of Past Life and Environments in Northeast Asia(Jilin University) Ministry of EducationChangchun 130061China Key Laboratory of Mineral Resources Evaluation of Northeast Asia Ministry of Natural ResourcesChangchun 130061China Key Laboratory for Oil Shale and Coexisting Minerals Jilin UniversityChangchun 130061China China Coal Energy Heilongjiang Coal Chemical Co..Ltd.Harbin 154854 China College of Earth Research Jilin UniversityChangchun 30026China

Many studies have focused on the Cretaceous evolution of NE China,including the 973 Scientific Exploration Well Work program,which completed two drill holes in this *** Cretaceous Basin Group of eastern NE China is highly altered,so the evolution,controlling factors and interpretation of the Early Cretaceous Dasanjiang Basin are controversial,and fundamental aspects of the rocks are poorly *** Boli Basin is the largest Cretaceous basin within NE China,but the temporal and spatial extent of Mesozoic strata within this basin,especially the Dongshan Formation,arc not well-known.

关键词： Cretaceous basin Basin

FM interference suppression for PRC-CW radar based on adaptive STFT and time-varying filtering

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2010年第2期21卷 219-223页

作者： zhao zhao Xiangquan shi School of Electronic Engineering and Optoelectric Technology Nanjing University of Science and Technology Nanjing 210094 E R. China

The influence of frequency modulation （FM） interfer- ence on correlation detection performance of the pseudo random code continuous wave （PRC-CW） radar is analyzed. It is found that the correlation output deteriorates greatly when the FM inter- ference power exceeds the anti-jamming limit of the radar. Accord- ing to the fact that the PRC-CW radar echo is a wideband pseudo random signal occupying the whole TF plane, while the FM in- terference only concentrates in a small portion, a new method is proposed based on adaptive short-time Fourier transform （STFT） and time-varying filtering for FM interference suppression. This method filters the received signal by using a binary mask to excise only the portion of the TF plane corrupted by the interference. Two types of interference, linear FM （LFM） and sinusoidal FM （SFM）, under different signal-to-jamming ratio （S JR） are studied. It is shown that the proposed method can effectively suppress the FM interference and improve the performance of target detection.

关键词： interference suppression frequency modulation in- terference adaptive short-time Fourier transform (STFT) time- varying filtering pseudo random code continuous wave (PRC-CW) radar.

Nature and timing of a prehistoric giant landslide on the eastern margin of the Tibetan Plateau

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2020年第6期17卷 1438-1451页

作者： zhao Xun WANG yun-sheng WANG shi-yuan zhao Bo ZENG Lu LIU Yu FENG Qian-qian State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu 610059China Sichuan Earthquake Agency Chengdu 610041China Key Laboratory of Mountain Hazards and Earth Surface Processes Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu 610041China

Studying the characteristics of a prehistoric giant landslide and ascertaining its relationship with palaeo-seismic events could provide useful information on the role of regional tectonic activities in hillslope ***,a giant palaeoseismic landslide(GPSL),namely,the Luanshibao(LSB)landslide,located on the eastern margin of the Qinghai-Tibet Plateau,was investigated to ascertain its characteristics and occurrence *** relationship between occurrence age and palaeoseismic episodes was also discussed by using 14 C dating on the adjacent active faults,including the regional Yidun-Litang-Dewu(YD-LT-DW)fault zone,which crossed the LSB *** dating of multiple samples acquired from palaeo-seismic trenches revealed that at least 5 palaeo-seismic episodes had occurred in the vicinity of the LSB landslide over the last 5000 *** occurrence age of the LSB landslide(3635±387 a BP)coincides with palaeo-seismic episode I,and the LSB landslide is convincingly inferred to have been triggered during episode I,which reached a seismic intensity(Chinese scale)of at least degree VII near the LSB landslide during *** timing of a second reactivation phase coincides with palaeo-seismic episode IV,which occurred at 2100-2200 a *** study could provide reference for studying the regional palaeoseismic activities and palaeo landslide evolution near the Litang area.

关键词： Prehistoric landslide Active fault zone Palaeo-seismic episode Dating

基于瓦片分区的雷达动态定量降水估测方法研究

在线全文

学校读者我要写书评

暂无评论

高原气象 2025年第1期44卷 122-133页

作者：李佳慧马建立陈明轩史朝成都信息工程大学四川成都610225 北京城市气象研究院北京100089

雷达定量降水估测(QPE)考虑雨滴谱的时空变异性,是提高QPE的有效途径。雷达采用Z-R关系开展降水估测时,雨滴谱的差异,主要表现为Z-R关系式不同;利用瓦片分区方法,将降水估测区域进行瓦片分区,每个瓦片内利用雷达和自动站数据动态拟合Z-... 详细信息

雷达定量降水估测(QPE)考虑雨滴谱的时空变异性,是提高QPE的有效途径。雷达采用Z-R关系开展降水估测时,雨滴谱的差异,主要表现为Z-R关系式不同;利用瓦片分区方法,将降水估测区域进行瓦片分区,每个瓦片内利用雷达和自动站数据动态拟合Z-R关系式开展QPE。文中利用六次天气过程对瓦片分区降水估测方法进行评估,从QPE各项评价指标看,误差较传统的固定Z-R关系法和全域动态Z-R关系法,有很好的提升,降水估测结果与强降水中心基本一致,各项误差指标均最小;结果表明瓦片分区降水估测方法是提升雷达QPE的有效方式。

关键词：降水估测雷达组网分区拟合

在线全文

学校读者我要写书评

暂无评论

复方白花蛇舌草治疗肺癌荷瘤小鼠的实验研究

实用中西医结合临床 2014年第9期14卷 81-83页

作者：赵诗云张瑾楠吴东风卢仁军尹小明江西省中医药研究院南昌330046 江西中医药大学 2012级研究生南昌330006 江西省人民医院南昌330006

目的:探讨复方白花蛇舌草体内抗肿瘤作用。方法:将肺癌荷瘤C57小鼠分为模型组、环磷酰胺(CTX)组、CTX+复方白花蛇舌草高、中、低剂量组与复方白花蛇舌草高剂量组,复方白花蛇舌草水煎剂灌胃,环磷酰胺腹腔注射。观察各组小鼠体重,瘤体、... 详细信息

目的:探讨复方白花蛇舌草体内抗肿瘤作用。方法:将肺癌荷瘤C57小鼠分为模型组、环磷酰胺(CTX)组、CTX+复方白花蛇舌草高、中、低剂量组与复方白花蛇舌草高剂量组,复方白花蛇舌草水煎剂灌胃,环磷酰胺腹腔注射。观察各组小鼠体重,瘤体、胸腺、脾脏重量,抑瘤率及血细胞变化。结果:CTX组与模型组比较荷瘤小鼠胸腺系数显著降低(P<0.05),白细胞显著下降(P<0.01);各治疗组对荷瘤鼠肿瘤的生长均有一定程度的抑制作用。结论:复方白花蛇舌草能够抑制荷瘤鼠肿瘤的生长,与CTX联合能够达到协同增效解毒的作用,且复方白花蛇舌草对血液系统未见毒副作用。

关键词：肺癌荷瘤小鼠复方白花蛇舌草 CTX 实验研究

The influence of MoS_2 on tribology characteristic parameter of Ni60A/MoS_2 composite lubricating coating

在线全文

学校读者我要写书评

暂无评论

Journal of Coal Science & Engineering(China) 2010年第1期16卷 94-98页

作者： zhao yun-cai GE shi-rong Institute of Tribology and Reliability Engineering China University of Mining and Technology Xuzhou 221003 China Department of Mechanical Engineering Jiangxi University of Science and Technology Ganzhou 341000 China

The influence of MoS2 on the tribology characteristic parameter of Ni60A/MoS2 composite lubricating coating was researched on the UMT-2 fretting abrasion tester （USA） The result shows that with increasing content of MoS2, the hardness curve of the composite coating decreases and the trend accelerates. Under the same experimental conditions, the mass loss of plasma spray composite coating without adding MoS2 iS 1.27×10^-2 mg. When the amount of MoS2 reaches 35%, the mass loss is 0.96×10^-2 mg. It can be seen that adding MoS2 phase can improve the wear resistance, the amplitude of which is close to 30%. The friction coefficient of plasma spray composite coating without adding MoS2 is 0.23. Adding MoSz could decrease the friction coefficient of the coating and presents a downtrend. When the mass fraction is 35%, the friction coefficient is the smallest （0.13）, and the range is doubled.

关键词： plasma spraying MoS2 phase composite lubricant coating tribology characteristic parameter friction coefficient

Hydrophilicity Modification of Addition-cured Room Temperature Vulcanization Silicone Rubber

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2006年第4期17卷 533-536页

作者： yun Xia QI shi Gui zhao Wei Feng JIANG Xin Xin YANG School of Material Science and Engineering Shandong University Jinan 250061

Allyl terminated polyether was used to improve the hydrophilicity of addition-cured room temperature vulcanization silicone rubber. With the increasing of the polyether, both the hydrophilicity and water absorbed of the vulcanizates were increased. The mechanical properties were also improved by adding the polyether. The result showed that 1.5wt% of the polyether provided the silicone rubber with proper hydrophilicity.

关键词： Allyl terminated polyether addition-cured silicone rubber room temperature vulcanization hydrophilicity mechanical properties.

Ancient Microorganisms and Carotenoids Preserved in Fluid Inclusions in Halite from Chaka Salt Lake,Western China:Evidence from Micro-observation and in situ Raman Spectroscopy

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2021年第3期95卷 1008-1015页

作者： CHEN Yong WANG Jiuyuan ZHOU Zhenzhu CHEN Xiaolan zhao Zhenyu shi Peng HAN yun School of Geosciences China University of Petroleum(East China)QingdaoShandong 266580China Shandong Provincial Key Laboratory of Depositional Mineralization&Sedimentary Mineral Shandong University of Science and TechnologyQingdaoShandong 266590China Department of Earth and Planetary Sciences Yale UniversityNew HavenCT 06511USA PetroChina Exploration and Development Institute Beijing 100083China Bohai Oil Research Institute Tianjin Branch of CNOOC Ltd300459Tianjin 300459China

Trapped ancient microorganisms in halite fluid inclusions are of special interest to the understanding of biology and ecology in salt lake *** the integration of petrologic,microthermometric,and Raman spectroscopic analyses,this study utilizes fluid inclusions from Chaka Salt Lake,eastern Qaidam Basin,NW China,to assess the possibility of microorganism-trapping by fluid ***,we report that the solid phase of some primary fluid inclusions contains carotenoids,which is interpreted as evidence of Dunaliella algae,and that the coexisting liquid phase comprises SO_(4)^(2-).The homogenization temperatures of single-phase primary fluid inclusions indicate that the precipitation temperature of the Holocene halite in Chaka Salt Lake ranges from 13.5℃ to 36.4℃.This suggests that fluid inclusions in halite are a good medium for trapping and preserving ancient microorganisms and organic matter in salt lakes,and that Raman spectroscopy has good potential to identify halophilic archaea.

关键词： invertebrate paleontology halophile microorganisms halite fluid inclusions carotenoids Qinghai Province

在线全文

学校读者我要写书评

暂无评论

稳心颗粒对心房颤动患者炎性因子的影响

河南中医 2016年第12期36卷 2101-2103页

作者：曹文斋张汀钟德超石兆云余江恒自贡市第一人民医院四川自贡643000 四川卫生康复职业学院四川自贡643000

目的:观察稳心颗粒对心房颤动(房颤)患者炎性因子的影响。方法:将220例房颤患者随机分为对照组111例和治疗组109例,对照组给予常规治疗,治疗组在对照组基础上口服稳心颗粒治疗。观察两组患者的临床疗效及治疗前后血清高敏C-反应蛋白(hig... 详细信息

目的:观察稳心颗粒对心房颤动(房颤)患者炎性因子的影响。方法:将220例房颤患者随机分为对照组111例和治疗组109例,对照组给予常规治疗,治疗组在对照组基础上口服稳心颗粒治疗。观察两组患者的临床疗效及治疗前后血清高敏C-反应蛋白(high-sensitivity Creaction protein,hs-CRP)、白细胞介素(interleukin,IL-6)和肿瘤坏死因子(tumor necrosis factor,TNF-α)的变化情况。结果:对照组有效率为58.6%,治疗组有效率为89.0%,两组患者临床疗效比较,差异具有统计学意义(P<0.05)。两组患者治疗后血清hs-CRP、IL-6、TNF-α优于治疗前,且治疗组优于对照组,差异均有统计学意义(P<0.05)。治疗过程中,稳心颗粒组患者未见明显副作用。结论:稳心颗粒治疗房颤疗效肯定,且无明显毒副反应。

关键词：心房颤动稳心颗粒炎性因子