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Assessment of cortical bone fatigue using coded nonlinear ultrasound

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Chinese Physics B 2021年第9期30卷 274-283页

作者： Duwei Liu Boyi Li Dongsheng Bi Tho N.H.T.Tran Yifang Li Dan Liu Ying Li dean Ta Center for Biomedical Engineering School of Information Science and TechnologyFudan UniversityShanghai 200433China Academy for Engineering and Technology Fudan UniversityShanghai 200433China Human Phenome Institute Fudan UniversityShanghai 200433China

Bone fatigue accumulation is a factor leading to bone fracture,which is a progressive process of microdamage deteriorating under long-term and repeated *** the microdamage of the early stage in bone is difficult to be investigated by linear ultrasound,the second harmonic generation method in nonlinear ultrasound technique is employed in this paper,which is proved to be more sensitive to *** solve the deficiency that the second harmonic component is easily submerged by noise in traditional nonlinear measurement,a weighted chirp coded sinusoidal signal was applied as the ultrasonic excitation,while pulse inversion is implemented at the receiving *** effectiveness of this combination to improve the signal-to-noise ratio has been demonstrated by in vitro *** fatigue loading experiments were conducted on the cortical bone plate in vitro for microdamage *** was a significant increase in the slope of the acoustic nonlinearity parameter with the propagation distance(increased by 8%and 24%respectively)when the bone specimen was at a progressive level of *** results indicate that the coded nonlinear ultrasonic method might have the potential in diagnosing bone fatigue.

关键词： nonlinear ultrasonic Lamb wave bone fatigue chirp code pulse inversion

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m & m?

汽车与运动 2014年第6期 100-104页

作者： Dan Prosser dean Smith 王兴宇

m235i这辆车带有"m"标识,但BmW却没有按照m家族命名体系给它"正名"。这辆双门轿跑车是否还具备纯正的"m"血统?为此,我们特地找到一辆跟他售价相近的二手E92 m3,通过对比来验证一下它的成色如何费劲干辛万苦,我们赶在日出之前到达了布雷... 详细信息

m235i这辆车带有"m"标识,但BmW却没有按照m家族命名体系给它"正名"。这辆双门轿跑车是否还具备纯正的"m"血统?为此,我们特地找到一辆跟他售价相近的二手E92 m3,通过对比来验证一下它的成色如何费劲干辛万苦,我们赶在日出之前到达了布雷肯山顶,但是事情往往不会一帆风顺——大雨在我们之前来到了这里。东方一大片乌云将我们希冀的一轮红日遮了个严实,更别提那夹杂着冰陵的刺骨寒风了。在这样的天气下,我们惟一能做的,就是躲在车内以免被冻伤。在m235i车内暖风的照料下,我凝视着车窗外的那辆E92 m3,开始从久远的记忆中梳理出关于它的点点线索。隆起的引擎盖。

关键词：一轮红日日出之前购车计划做事方式给你限滑差速器手动变速器从车抓地力冰棱

Amplitude modulation excitation for cancellous bone evaluation using a portable ultrasonic backscatter instrumentation

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Chinese Physics B 2022年第11期31卷 106-114页

作者： Boyi Li Chengcheng Liu Xin Liu Tho N.H.T.Tran Ying Li Dan Li Dongsheng Bi Duwei Liu dean Ta Academy for Engineering and Technology Fudan UniversityShanghai 200433China The Center for Biomedical Engineering Fudan UniversityShanghai 200433China The State Key Laboratory of medical Neurobiology Fudan UniversityShanghai 200433China

The ultrasonic backscatter(UB)has the advantage of non-invasively obtaining bone density and structure,expected to be an assessment tool for early diagnosis *** former UB measurements were based on exciting a short single-pulse and analyzing the ultrasonic signals backscattered in *** study aims to examine amplitude modulation(Am)ultrasonic excitation with UB measurements for predicting bone *** Am multiple lengths excitation and backscatter measurement(Am-UB)functions were integrated into a portable ultrasonic instrument for bone *** apparent integrated backscatter coefficient in the Am excitation(AIB_(Am))was evaluated on the Am-UB *** correlation coefficients of the AIB_(Am) estimating volume fraction(BV/TV),structure model index(SmI),and bone mineral density(BmD)were then *** correlations(|R|=0.82-0.93,pm),BV/TV,SmI,and *** growing the Am excitation length,the AIB_(Am) values exhibit more stability both in 1.0-mHz and 3.5-mHz *** recommendations in Am-UB measurement were that the avoided length(T1)should be lower than Am excitation length,and the analysis length(T2)should be enough long but not more than Am excitation *** authors conducted an Am-UB measurement for cancellous bone *** the Am excitation length could substantially enhance AIB_(Am) values stability with varying analyzed *** study suggests the portable Am-UB instrument with the integration of real-time analytics software that might provide a potential tool for osteoporosis early screening.

关键词： ultrasonic backscatter measurement amplitude modulation osteoporosis bone diagnosis

通过模拟学习最大限度地提高物理治疗的临床实习成效（英文）

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康复学报 2015年第1期25卷 44-49页

作者： Alice Y m JONES margot A SKINNER Elizabeth dean 格里菲斯大学联合健康科学学院悉尼大学健康科学院奥塔哥大学物理治疗学院英属哥伦比亚大学医学院物理治疗部门

本文描述物理治疗专业和物理治疗入门级教育在中国康复医学教育中的演变,提倡以模拟学习技术(simulation-based learning,SBL)为临床实习生积累经验。与医学专业的学生一样,物理治疗专业学生的教育需要一个结构化的临床教育方案,以确保... 详细信息

本文描述物理治疗专业和物理治疗入门级教育在中国康复医学教育中的演变,提倡以模拟学习技术(simulation-based learning,SBL)为临床实习生积累经验。与医学专业的学生一样,物理治疗专业学生的教育需要一个结构化的临床教育方案,以确保毕业时具备一定的临床专业能力。SBL多年以来一直是医学、工程以及航空专业的首选教学模式。在物理治疗专业培养方案中,SBL培养临床技能的教学模式已经出现。本文亦论述SBL在物理治疗专业入门级教育中的优势,尤其是使用模拟标准化患者作为核心临床教育内容,为学生进入临床实习做好准备。我们建议中国可以将SBL应用在物理治疗专业人才培养方案中,这能够最大限度地提高学生的临床实习经验。

关键词：物理治疗教育模拟学习模式临床实习成效最大化

A study of mechanical behavior of rock-fill materials with reference to particle crushing

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Science China(Technological Sciences) 2007年第z1期50卷 125-135页

作者： HUANG WenXiong1?, REN QingWen1 & SUN dean2 1 Department of Engineering mechanics, Hohai University, Nanjing 210098, China 2 Department of Civil Engineering, Shanghai University, Shanghai 200072, China Department of Engineering mechanics Hohai University Nanjing 210098 China Department of Civil Engineering Shanghai University Shanghai 200072 China

In rock-fill dams of 200 to 300 m high, maximum compressive stress can exceed 6 mPa. At such a high stress level, rock-fill materials may experience particle crushing during shear. The material behavior is highly sophisticated exhibiting pressure and density dependency as well as particle crushing effects. Through scrutinizing the relevant experimental data on rock-fill materials and sands published in the literatures, this paper is focused on understanding basic mechanical characteristics of this sort of materials in the light of constitutive modelling.

关键词： rock-fill materials granular materials compressibility shear dilatancy particle crushing

Linear Dimension Reduction for multiple Heteroscedastic multivariate Normal Populations

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Open Journal of Statistics 2015年第4期5卷 311-333页

作者： Songthip T. Ounpraseuth Phil D. Young Johanna S. van Zyl Tyler W. Nelson dean m. Young Department of Biostatistics University of Arkansas for Medical Sciences Little Rock AK USA Department of Statistical Science Baylor University Waco TX USA

For the case where all multivariate normal parameters are known, we derive a new linear dimension reduction (LDR) method to determine a low-dimensional subspace that preserves or nearly preserves the original feature-space separation of the individual populations and the Bayes probability of misclassification. We also give necessary and sufficient conditions which provide the smallest reduced dimension that essentially retains the Bayes probability of misclassification from the original full-dimensional space in the reduced space. moreover, our new LDR procedure requires no computationally expensive optimization procedure. Finally, for the case where parameters are unknown, we devise a LDR method based on our new theorem and compare our LDR method with three competing LDR methods using monte Carlo simulations and a parametric bootstrap based on real data.

关键词： Linear Transformation Bayes Classification Feature Extraction Probability of misclassification

Feasibility study for bone health assessment based on photoacoustic imaging method

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Chinese Optics Letters 2020年第12期18卷 49-53页

作者： Ting Feng Yunhao Zhu Yejing Xie dean Ta Jie Yuan Qian Cheng School of Electronic and Optical Engineering Nanjing University of Science and TechnologyNanjing 210094China Institute of Acoustics School of Physics Science and EngineeringTongji UniversityShanghai 200092China School of Electronic Science and Engineering Nanjing UniversityNanjing 210094China Department of Electronic Engineering Fudan UniversityShanghai 200433China Key Laboratory of Spine and Spinal Cord Injury Repair and Regeneration of ministry of Education Orthopaedic Department of Tongji HospitalTongji University School of MedicineShanghai 200065China

This study investigated the feasibility of photoacoustic(PA) imaging of bone and characterization of bone features. By conducting the experiments on bovine femoral heads ex vivo, the light and ultrasonic penetration in bones was studied, together with the depth of PA imaging and measurement in bones. Then, the possibility of three-dimensional(3 D) PA imaging of bones by raster scanning of the focusing transducer was studied. The micro-computerized tomography images of the bovine ribs with and without ethylenediaminetetraacetic acid(EDTA) treatment indicated that the 3 D PA images could present the changes of bone microstructure resulting from the EDTA treatment. By using PA spectral analysis, the bone samples with and without the treatment of EDTA solution can be distinguished, and the microstructures can be characterized. This study was based on the bovine bone whose size is comparable to human bones, suggesting that PA technology can be used as a novel bone diagnostic technique.

关键词： photoacoustic imaging bone assessment osteoporosis bone health cliaracterization

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英语角 2021年第35期 36-39页

作者： dean 不详

Doing His Homework Nathan is sitting on the back of his pet dog and writing something when his mother comes *** is surprised."What on earth are you doing there?Where is your sister?"she asks."Well,the teacher told us to write an essay on our favourite animal,"Nathan answers.“That's why I'm here and that's why Sally is sitting in the goldfish bowl.'

关键词： something 快乐阅读 she

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美国电力研究所的煤灰利用研究

煤炭转化 1986年第1期 72-82页

作者： dean m.Golden,P.E,葛世培美国电力研究所

本文叙述美国电力研究所的一个五年计划项目。这个项目的目的是在全国范围内增加煤灰的大量利用(high volume uses),同时也包括国际范围内的应用。煤灰的大量利用包括:用于建造公路、铁路、回填、路面的基层、混凝土和灌浆等。也包括萃... 详细信息

本文叙述美国电力研究所的一个五年计划项目。这个项目的目的是在全国范围内增加煤灰的大量利用(high volume uses),同时也包括国际范围内的应用。煤灰的大量利用包括:用于建造公路、铁路、回填、路面的基层、混凝土和灌浆等。也包括萃取以后煤灰的再利用。

关键词：煤灰电厂酸浸提法电力美国美利坚合众国北美洲研究所利用研究