检索结果-内蒙古大学图书馆

您好，读者！请登录

内蒙古大学图书馆

首页
概况
党建
资源
服务
科研支持
- 论文收录引用证明
- 科技查新
知识产权
档案馆
帮助

咨询与建议

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

您的常用邮箱：*

您的手机号码：*

问题描述：

当前已输入0个字，您还可以输入200个字

全部搜索
期刊论文
图书
学位论文
标准
纸本馆藏
外文资源发现
数据库导航
超星发现

高级检索

时间限定

出版年份：

文献类型

图书期刊文献学位论文多媒体

馆藏选择

电子馆藏纸本馆藏

核心期刊

全部期刊 SCI 收录期刊 SSCI 收录期刊 EI 收录期刊 CSCD 收录期刊 CSSCI 收录期刊

语言

中文英文

文献类型

期刊文献图书学位论文标准纸本馆藏

帮助

文字说明：

T=题名（书名、题名），A=作者（责任者），K=主题词，P=出版物名称，PU=出版社名称，O=机构（作者单位、学位授予单位、专利申请人），L=中图分类号，C=学科分类号，U=全部字段，Y=年（出版发行年、学位年度、标准发布年）

检索规则说明：

AND代表“并且”；OR代表“或者”；NOT代表“不包含”；(注意必须大写,运算符两边需空一格)

检索范例：

范例一：(K=图书馆学 OR K=情报学) AND A=范并思 AND Y=1982-2016
范例二：P=计算机应用与软件 AND (U=C++ OR U=Basic) NOT K=Visual AND Y=2011-2016

分类表

所选分类

>> <<

限定检索结果

文献类型

150 篇 会议
33 篇 期刊文献

馆藏范围

183 篇 电子文献
0 种 纸本馆藏

日期分布

学科分类号

77 篇 工学
- 56 篇 生物医学工程（可授...
- 34 篇 生物工程
- 19 篇 仪器科学与技术
- 15 篇 计算机科学与技术...
- 12 篇 软件工程
- 10 篇 电气工程
- 10 篇 电子科学与技术（可...
- 9 篇 光学工程
- 9 篇 材料科学与工程（可...
- 7 篇 信息与通信工程
- 6 篇 机械工程
- 5 篇 化学工程与技术
- 4 篇 动力工程及工程热...
- 3 篇 力学（可授工学、理...
- 3 篇 船舶与海洋工程
- 3 篇 航空宇航科学与技...
- 2 篇 土木工程
71 篇 理学
- 46 篇 物理学
- 30 篇 生物学
- 23 篇 数学
- 8 篇 统计学（可授理学、...
- 5 篇 化学
- 3 篇 系统科学
24 篇 医学
- 20 篇 临床医学
- 18 篇 基础医学(可授医学...
- 15 篇 药学(可授医学、理...
- 2 篇 公共卫生与预防医...
- 2 篇 护理学（可授医学、...
5 篇 管理学
- 3 篇 图书情报与档案管...
- 2 篇 公共管理
1 篇 教育学
1 篇 农学

主题

27 篇 ultrasonic imagi...
13 篇 biomedical engin...
11 篇 acoustics
11 篇 electrocardiogra...
11 篇 cardiology
10 篇 phantoms
9 篇 ultrasonics
8 篇 image segmentati...
8 篇 signal analysis
8 篇 muscles
7 篇 ultrasonic varia...
7 篇 testing
6 篇 blood
6 篇 biomedical measu...
6 篇 electroencephalo...
6 篇 biological tissu...
6 篇 frequency
6 篇 humans
6 篇 bones
5 篇 attenuation

机构

20 篇 biomedical engin...
19 篇 biomedical engin...
9 篇 biomedical engin...
6 篇 biomedical engin...
4 篇 biomedical engin...
4 篇 biomedical engin...
4 篇 electrical engin...
4 篇 biomedical engin...
4 篇 department of ca...
4 篇 biomedical engin...
4 篇 biomedical engin...
4 篇 biomedical engin...
3 篇 biomedical engin...
3 篇 laboratory of ul...
2 篇 brain mapping an...
2 篇 universidade fed...
2 篇 sport and physic...
2 篇 laboratorio de a...
2 篇 hospital univers...
2 篇 biomedical engin...

作者

22 篇 w. c. a. pereira
14 篇 pereira w.c.a.
12 篇 infantosi a.f.c.
12 篇 j. nadal
9 篇 m. a. von krüger
9 篇 nadal j.
8 篇 a.f.c. infantosi
8 篇 a. f. c. infanto...
8 篇 m.n. souza
7 篇 w.c.a. pereira
5 篇 alberto schanaid...
5 篇 monica soldan
5 篇 p.r.b. barbosa
4 篇 barbosa-filho j.
4 篇 wagner c. pereir...
4 篇 d.m. simpson
4 篇 g. a. cortela
4 篇 wagner c. a. per...
4 篇 w. gómez
4 篇 jurandir nadal

语言

182 篇 英文
1 篇 其他

检索条件"机构=Biomedical Engineering Program/Coppe"

共 183 条记录，以下是41-50 订阅

全选清除本页清除全部题录导出标记到"检索档案"

详细简洁

排序：

The ultrasonic attenuation coefficient for human blood plasma in the frequency range of 7-90 MHz

The ultrasonic attenuation coefficient for human blood plasm...

引用

2004 IEEE Ultrasonics Symposium

作者： Filho, M. M. Calor Machado, J.C. PETROBRAS Rio de Janeiro RJ 21945-900 Brazil Biomedical Engineering Program COPPE Federal University of Rio de Janeiro Rio de Janeiro RJ 21945-970 Brazil

ISBN: (纸本)0780384121

This work presents experimental results of the ultrasound attenuation coefficient of human blood plasma in the frequency range of 7-90 MHz. Measurements were done with a sample of 450 μL of plasma immersed in a water bath with the temperature controlled at 36.5°C. The results follow the power law frequency dependence with an exponent of 1.43, compatible with the literature results for low frequency. Also, the results indicate a relaxation mechanism in the vicinity of 10 MHz. © 2004 IEEE.

关键词： Ultrasonics

来源：评论

学校读者我要写书评

暂无评论

Simples coherence vs. multiple coherence: A somatosensory evoked response detection investigation

Simples coherence vs. multiple coherence: A somatosensory ev...

引用

12th Mediterranean Conference on Medical and Biological engineering and Computing, MEDICON 2010

作者： Melges, D.B. De Sá, A. M. F. L. Miranda Infantosi, A.F.C. Biomedical Engineering Program COPPE Federal University of Rio de Janeiro Av. Horácio Macedo 2030 Sala 327 CEP 21941-914 Rio de Janeiro Brazil

ISBN: (纸本)9783642130380

In this work the performance of two techniques useful for detecting the somatosensory evoked potential (SEP), namely the Magnitude-Squared Coherence (MSC or Simple Coherence) and its multivariate version, the Multiple Coherence (MC), was compared. Electroencephalographic (EEG) signals during somatosensory stimulation were collected from forty adult volunteers without history of neurological pathology using the 10-20 International System. All leads were referenced to the earlobe average. The stimulation was carried out throughout current pulses (200 μs width) applied to the right posterior tibial nerve (motor threshold intensity level) at the rate of 5 Hz. The response detection was based on rejecting the null hypothesis of response absence (M = 100 epochs and significance level α = 0.05). The MSC was applied to the derivations [Cz], [Fz], [C3] and [C4], usually employed in the SEP recordings when bipolar derivations are used. The MC was applied to the pairs [Cz][Fz] and [C3][C4]. The results indicated that if two derivations are available, it should be better to use the MC applied to both leads than the MSC applied to each one. © 2010 International Federation for Medical and Biological engineering.

关键词： Electroencephalography

来源：评论

学校读者我要写书评

暂无评论

Analysis of different techniques for measuring the attenuation coefficient in ultrasonic phantom

Analysis of different techniques for measuring the attenuati...

引用

Pan American Health Care Exchanges, PAHCE 2011 - Conference, Workshops, and Exhibits. Cooperation / Linkages: An Independent Forum for Patient Care and Technology Support

作者： Maggi, L.E. Costa, J.F.S. Cortela, G.A. Pereira, W.C.A. Von Kruger, M.A. State University of Goiás Goiânia GO Brazil Biomedical Engineering Program COPPE/UFRJ Rio de Janeiro RJ Brazil Ultrasonic Acoustics Laboratory UDELAR Montevideo Uruguay

ISBN: (纸本)9781612849164

This work describes some techniques for estimating the attenuation coefficient of longitudinal wave in a phantom made with RTV615 (GE) and silicone. The AWAY method presented results with lower standard deviation when RMS or FFT was applied to analyze the ultrasonic signal. Furthermore, it was observed that the use of APPARENT AWAY method with the FFT has sensitivity to number of cycles of the burst used, because the increased number of cycles considerably reduced the standard deviation of the results. However, if the number of cycles is greater than 10, the application of FFT and RMS methods gave similar results and should provide the same standard deviation. © 2011 IEEE.

关键词： Phantoms

来源：评论

学校读者我要写书评

暂无评论

Speech aid for the deaf based on a representation of the vocal tract: the vowel module

Speech aid for the deaf based on a representation of the voc...

引用

Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： P.M.T. de Oliveira M.N. Souza Biomedical Engineering Program COPPE Federal University of Rio de Janeiro Brazil

Presents a new method for speech training of deaf and hard-of-hearing people, using a computer accompanied with an A/D sound card. The idea is to produce a visual feedback of the deaf person's voice, also giving information about what must be done in order to correctly produce the required speech sound. The visual representation attempts to reproduce the configuration of the speaker's vocal tract in real time, during vowel articulation. Since changes in this configuration reflect changes of the spectral envelope of the speech signal, we need to solve the inverse problem: obtaining the vocal tract shape from the speech signal. To solve this problem, signal processing techniques such as linear predictive coding were used. We hope that this representation can be more effective than other representations in use today, such as spectra and spectrograms, due to its closer association with the speech production processes.

关键词： Deafness Linear predictive coding Speech processing Feedback Resonance Signal processing Tongue Mouth Data acquisition biomedical engineering

来源：评论

学校读者我要写书评

暂无评论

Active contours without edges applied to breast lesions on ultrasound

Active contours without edges applied to breast lesions on u...

引用

作者： Gómez, W. Infantosi, A.F.C. Leija, L. Pereira, W.C.A. Department of Electrical Engineering CINVESTAV-IPN Mexico D.F. Mexico Biomedical Engineering Program COPPE/UFRJ Cidade Universitária Horácio Macedo Ave. 2030 Rio de Janeiro Brazil

ISBN: (纸本)9783642130380

A computerized lesion segmentation technique for breast ultrasound images is proposed. It uses a deformable model based on active contours without edges. The performance of this technique was accessed by comparing the resulting contours of 50 ultrasonographies with those manually delineated by two radiologists. For the boundary, the error metrics used were the Hausdorff distance (HD) and the mean absolute distance (MD). The error area was assessed by using the percentage of false positive (FP), false negative (FN), and true positive (TP) pixels. The results were HD = 8.76±6.04, MD = 2.78±1.20, FP = 4.98±3.83, FN = 16.19±6.85, and TP = 83.86±6.75. These findings indicate that the proposed technique was capable to reach high detailed contours. © 2010 International Federation for Medical and Biological engineering.

关键词： Image segmentation

来源：评论

学校读者我要写书评

暂无评论

Ischemic episode detection using an artificial neural network trained with isolated ST-T segments

Ischemic episode detection using an artificial neural networ...

引用

Computers in Cardiology (CinC)

作者： D. Frenkel J. Nadal Biomedical Engineering Program COPPE Federal University of Rio de Janeiro Brazil

The presence of changes in the ST segment of the ECG followed or not by chest pain is related to ischemic heart disease and indicates increased risk of malignant arrhythmia and sudden death. This paper proposes a method for automatic ST changes detection to help the analysis of ambulatory monitoring. ECG data segments with ST-T intervals are extracted and, through principal component analysis, reduced to six components that represent 98.1% of total data variance. Data from 45 patients of the European ST-T Database were organized into three groups to develop, validate and test feedforward ANN. With six inputs, 10 neurons in the hidden layer and three in the output the ANN showed 69.6% total accuracy when classifying isolated segments. Fixed thresholds were applied to the output neutrons for detecting sequences of abnormal ST segments. The performance, 85.83% sensitivity for negative and 78.38% for positive, are similar to others reported in literature.

关键词： Artificial neural networks Electrocardiography Pain Cardiac disease Cancer Patient monitoring Computerized monitoring Data mining Principal component analysis Databases

来源：评论

学校读者我要写书评

暂无评论

Principal components clustering through a variance-defined metric

Principal components clustering through a variance-defined m...

引用

12th Mediterranean Conference on Medical and Biological engineering and Computing, MEDICON 2010

作者： Costa, J.C.G.D. Melges, D.B. Almeida, R.M.V.R. Infantosi, A.F.C. Biomedical Engineering Program COPPE-Federal University of Rio de Janeiro Av. Horacio Macedo 2030 Bl. H Rio de Janeiro Zip code 21941-972 Brazil

ISBN: (纸本)9783642130380

This work aims at proposing a clustering procedure through a new metric, a weighted Euclidean distance, in which the weights are the ratio of corresponding eigenvalues and the largest eigenvalue found after a Principal Components Analysis. In order to illustrate the method, the procedure was carried out on twenty-one newborn EEG segments, classified as TA (Tracé Alternant) or HVS (High Voltage Slow) patterns. The observed clustering structure was assessed by the cophenetic and agglomerative coefficients. Results showed that, despite its unlikely existence, a clustering structure was suggested by the traditional approach. This structure, however, was not confirmed by the proposed method. © 2010 International Federation for Medical and Biological engineering.

关键词： Principal component analysis

来源：评论

学校读者我要写书评

暂无评论

An interpolation-free and fitting-less sub-sample time-delay estimation algorithm

An interpolation-free and fitting-less sub-sample time-delay...

引用

International Conference on Health Informatics, ICHI 2013

作者： Teixeira, César A. Ruano, M. Graça Pereira, W.C.A. Centre for Informatics and Systems University of Coimbra Coimbra Portugal University of Algarve Faro Portugal Biomedical Engineering Program - COPPE Federal University of Rio de Janeiro-UFRJ Rio de Janeiro Brazil

ISBN: (纸本)9783319030043

In this paper we propose a new algorithm for sub-sample time-delay estimation between two discrete-time signals. The new algorithm operates just over the discrete-time signals without the need for interpolation or fitting. The proposed method is compared with a method based on spline fitting, and that is referred to outperform other methods over a broader set of conditions (Viola&Walker, 2005). The new approach, besides presenting a low computational cost (70% less), seemed to outperforms the spline approach in situations of high noise levels (typically signal-to noise ratios smaller than 20dB). © 2014, Springer International Publishing Switzerland.

关键词： Interpolation

来源：评论

学校读者我要写书评

暂无评论

Tracing the shear modulus of blood plasma during clotting and based on acoustic radiation force induced vibration of an embedded sphere

Tracing the shear modulus of blood plasma during clotting an...

引用

2017 IEEE International Ultrasonics Symposium, IUS 2017

作者： Silva Costa, Jose Francisco Machado, Joao Carlos Guilherme Crossetti Parcero João Carlos Machado Biomedical Engineering Program COPPE/UFRJ Rio de Janeiro Brazil Post-Graduation Program in Surgical Sciences Dept. of Surgery/School of Medicine/UFRJ Rio de Janeiro Brazil

ISBN: (纸本)9781538633830

During coagulation, blood changes from liquid to gel, and the clot viscoelastic properties continue modifying until fibrinolysis. Ultrasound (US) was used in this work to trace the time-changing shear modulus, μ, during plasma clotting, based on the vibration signature induced by an impulsive acoustic radiation force (iARF) on a sphere embedded in a plasma sample along its clotting process induced based on the aPTT (activated partial thromboplastin time) assay. An US push system transmitted bursts of US pulses (2.03 MHz, 1000 cycles and 1.25 Hz of pulse repetition frequency) to generate an iARF on the glass sphere (4.0 mm in diameter and density of 2500 kg/m3), which displacement was monitored by a 5.0 MHz US pulse-echo probing system. The relative delays between the rf-echo signals from the sphere yielded the signal representing the sphere damped oscillation that was fitted with a theoretical-model displacement function whose unknowns are the iARF amplitude and the medium μ and shear viscosity, η. The method was repeated five times and the time-changing mean μ was determined along 2100 s of the clotting process. During the first 15 s μ remained at 20 Pa and then varied rapidly until 60 s, at a rate of 1.9 Pa/s. Between 60 and 800 s, μ varied at a rate of 0.2 Pa/s. From 800 to 2100 s μ remained stable at about 280 Pa. The interval of fast changing μ corresponds to the fibrin formation period and comprehends the clotting time of 25s typically obtained with the aPTT assay for control plasma. © 2017 IEEE.

关键词： Coagulation Plasmas Acoustics Force Glass Transducers

来源：评论

学校读者我要写书评

暂无评论

Preliminary study of pseudoarthrosis ultrasonic characterization

Preliminary study of pseudoarthrosis ultrasonic characteriza...

引用

2009 IEEE International Ultrasonics Symposium, IUS 2009

作者： Matusin, Daniel Patterson Pereira, Wagner Coelho De A. Machado, Christiano Bittencourt Ferreira, Manoel L. Schanaider, Alberto Biomedical Engineering Program - COPPE Federal University of Rio de Janeiro Rio de Janeiro Brazil Experimental Surgery Department - CCS Federal University of Rio de Janeiro Rio de Janeiro Brazil

ISBN: (纸本)9781424443895

Pseudoarthosis is a consequence of a failure in bone fracture healing process, resulting in a non-union and relative motion between fragments. The evolution of fracture consolidation and the diagnosis of pseudoarthrosis have often a follow-up with conventional X-rays exams. Quantitative ultrasound (US) characterization has the advantage of being a non-ionizing energy and of low cost. A pulse-echo substitution method to characterize biological tissues by backscattered US was implemented. Pseudoarthrosis characterization was made by parameters Apparent Integrated Backscatter - AIB, Frequency Slope Apparent Backscatter - FSAB and Time Slope Apparent Backscatter - TSAB. Initials results have shown that parameters AIB and FSAB were able to differentiate normal from pseudoarthrotic tissues with statistical significance. Additional experiments with a greater number of samples are to be made, as well as some methodological adjustments aiming in vivo applications. ©2009 IEEE.

关键词： Ultrasonics

来源：评论

学校读者我要写书评

暂无评论

没有更多数据了...

全选清除本页清除全部题录导出标记到“检索档案”

共19页 << < 1 2 3 4 5 6 7 8 9 10 > >>

检索报告对象比较合并检索0

隐藏清空

合并搜索

回到顶部

执行限定条件

内容：

评分：

请选择保存的检索档案：

请选择收藏分类：

订阅名称：

通借通还

温馨提示：

图书名称：

借书校区：

取书校区：

手机号码：

邮箱地址：

一卡通帐号：

电话和邮箱必须正确填写，我们会与您联系确认。

联系人：

所在院系：

联系邮箱：

联系电话：

内蒙古自治区呼和浩特市赛罕区大学西街235号邮编: 010021

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：