检索结果-南通市图书馆

Analysis of the Influence of Sound Source Position and Electrode Placement on the Stimulation Pattern of the Cochlear Implant under Noise Conditions: Optimization of Auditory Perceptual Effects

引用

International Journal of Otolaryngology and Head & Neck Surgery 2024年第3期13卷 194-212页

作者： johannes burkart School of Advanced Education Research and Accreditation Castell&#243n de la Plana Spain Department of Otorhinolaryngology Head and Neck Surgery University Hospital Mannheim Mannheim Germany

Background: Cochlear implants (CI) are widely used to restore hearing in people with severe to profound hearing loss. However, optimizing CI performance, especially in difficult listening environments with background noise, remains a major challenge. Understanding the influence of factors such as sound source position and electrode placement on CI stimulation patterns is critical to improving auditory perception. Methods: In this study, an analysis was conducted to investigate the influence of sound source position and electrode placement on CI stimulation patterns under noisy conditions. For this purpose, a special measurement setup with a CI speech processor-microphone test box was used to simulate realistic listening scenarios and measure CI performance. Results: The results show that the effectiveness of CI noise reduction systems is influenced by factors such as the position of the sound source and electrode placement. In particular, the beamforming ultra zoom mode showed significantly better noise reduction than the omnidirectional mode, especially under real listening conditions. Furthermore, differences in electrode responses indicate individual variability in the CI user experience, highlighting the importance of personalized fitting algorithms. Conclusions: The results demonstrate the importance of considering environmental factors and individual differences when optimizing CI performance. Future research efforts should focus on the development of personalized fitting algorithms and the exploration of innovative strategies, such as the integration of artificial intelligence, to improve CI functionality in different listening environments. This study contributes to our understanding of CI stimulation patterns and lays the foundation for improving auditory perception in CI users.

关键词： Cochlear Implants Noise Reduction Ultra Zoom Beamforming Anatomical Variations Personalized Fittings

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Development and Optimization of Universal Bone Conduction Hearing Spectacles

引用

International Journal of Otolaryngology and Head & Neck Surgery 2024年第5期13卷 344-358页

作者： johannes burkart Mona Kirstin Fehling Saadu Adamu Raúl Pérez Ramos Daniel Häussler Department of Otorhinolaryngology Head and Neck Surgery University Hospital Mannheim Mannheim Germany National Ear Care Centre Kaduna Nigeria School of Advanced Education Research and Accreditation University Isabel I Castelln de la Plana Spain

Background: Non-implantable bone anchored hearing devices (BCHDs) are utilized for patients with conductive or mixed hearing loss who are unsuitable for conventional hearing aids or have unresolved middle ear issues. These devices can be surgically implanted or attached using adhesive plates, dental sticks, elastic headbands, or bone conduction spectacles. Optimal fitting of bone conduction spectacles requires appropriate frame selection and contact pressure in the temporal and mastoid areas. The ANSI S3.6 and DIN EN ISO 389-3 standards recommend a contact area of approximately 1.75 cm2 and a maximum force of 5.4 N for effective sound transmission and comfort. Methods: This study aimed to evaluate the technical fit and mechanical stability of universal bone conduction hearing spectacles compared to established systems. A Sen-Pressure 02 thin-film sensor connected to an Arduino Uno R3 board measured contact force in the temporal and mastoid areas. Several BCHDs were tested, including the Bruckhoff la belle BC D50/70, Radioear B71 headset, Radioear B71 elastic headband, Cochlear Baha SoundArc M, and Cochlear Baha elastic headband, on a PVC artificial head, with data analyzed using ANOVA and LSD post hoc tests. Results: The la belle BC D50/70 spectacles showed comparable contact force to established BCHDs, ensuring adequate sound transmission and comfort. Significant differences were observed between the systems, with the Radioear B71 headset exhibiting the highest forces. The la belle BC D50/70 had similar forces to the Radioear B71 elastic headband. Conclusion: The la belle BC D50/70 universal bone conduction hearing spectacles are a technically equivalent alternative to established BCHDs, maintaining pressure below 5.4 N. Future research should explore the impact of different contact forces on performance and comfort, and the integration of force control in modified spectacles. This study indicates that the la belle BC D50/70 is a viable alternative that meets audio

关键词： Bone Conduction Hearing Devices (BCHD) Universal Bone Conduction Hearing Spec-Tacles Non-Implantable Hearing Aids Contact Pressure Optimization

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Analysis of the Influence of Sound Source Position and Electrode Placement on the Stimulation Pattern of the Cochlear Implant under Noise Conditions: Optimization of Auditory Perceptual Effects

引用

International Journal of Otolaryngology and Head & Neck Surgery（耳鼻喉） 2024年第3期 194页

作者： johannes burkart

来源：博看期刊评论

在线全文

博看期刊

学校读者我要写书评

暂无评论

Methods for measuring pre-,intra-,and postoperative skin thickness for cochlear implants

引用

Journal of Otology 2022年第2期17卷 72-77页

作者： Lena Zaubitzer Elena Schaefer Elisabeth Wallhaeuser-Franke johannes burkart Katrin Herrmann Beatrice Walter Angela Schell Claudia Scherl Jerome Servais Daniel Haeussler Department of Otorhinolaryngology Head and Neck Surgery University Hospital MannheimMedical Faculty MannheimRuprecht-Karls-Universitat HeidelbergGermany Department of Neuroradiology University Hospital MannheimMedical Faculty MannheimRuprecht-Karls-Universitat HeidelbergGermany

Objective:This study was conducted to determine whether there is a reliable method for measuring the thickness of the retroauricular skin before,during,and after cochlear implantation,which allows the assessment of the optimal force of the external magnet of the cochlear implant(CI).Methods:The retroauricular skin thickness of 83 patients who received a CI was measured using three different *** thickness was measured on pre-and postoperative CT images,as well as *** magnet category chosen by the surgeon was recorded when the implant was switched on and during the first follow-up *** analyses were performed on the different skin thickness measurements and between the skin thickness and magnet strength ***:Only six patients required an exchange of the magnet until the *** the median absolute thickness differed significantly between the three measures(p<0.0001),their thickness values showed highly significant correlations(Pearson’s r=0.457-0.585;p<0.01).In addition,magnet strength,was significantly correlated with the flap thickness determined pre-,post-,and during *** lowest correlation with magnet strength was found in the intraoperative needle ***:All three measurements methods provided a suitable base for determining the ideal magnetic ***,of particular interest were the pre-and postoperative CT *** first enabled the early assessment of the required magnetic strength and thus a timely postoperative supply,whereas the latter helped to estimate the need for magnetic strength reduction during follow-up care and the feasibility of an early swith-on.

关键词： Cochlear implant Headpiece Magnet strength Flap thickness

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

高产能大型传动轴生产

引用

金属加工（冷加工） 2010年第17期 23-24页

作者： johannes burkart 德国埃尔温勇克机器制造有限公司

水上交通工具是人类发明的最大的可移动建筑。如果我们把一艘船拆分开来,观察其组成部分,便会发现：船舶中使用了超常规的大型零件,并且需要保证其长达几十年的正常使用。因此，对船舶中的每个零件和各种部件的质量要求都十分苛刻。而... 详细信息

水上交通工具是人类发明的最大的可移动建筑。如果我们把一艘船拆分开来,观察其组成部分,便会发现：船舶中使用了超常规的大型零件,并且需要保证其长达几十年的正常使用。因此，对船舶中的每个零件和各种部件的质量要求都十分苛刻。而作为船舶的心脏，发动机和变速箱的重要性尤为突出。

关键词：传动轴生产产能大型零件交通工具组成部分船舶可移动

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

用于五轴精密加工的3D管件激光切割设备

引用

现代制造 2014年第41期 28-28,30,31页

作者： johannes burkart

如今，Mazak公司可以提供一种专门为复杂或弯状的长型管件和型材进行3D精密切割的FabriGear激光切割设备。该设备适用于对建筑业、汽车业和机器制造业上部件的加工。Mazak公司开发此类设备主要就是为了满足用户对切割速度和加工盲径的... 详细信息

如今，Mazak公司可以提供一种专门为复杂或弯状的长型管件和型材进行3D精密切割的FabriGear激光切割设备。该设备适用于对建筑业、汽车业和机器制造业上部件的加工。Mazak公司开发此类设备主要就是为了满足用户对切割速度和加工盲径的高要求。

关键词：切割设备精密加工激光管件 3D Mazak公司五轴机器制造业

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Application of dynamic image analysis to the optical characterisation of fibrous bulk material

引用

Particuology 2024年第7期90卷 51-60页

作者： johannes Lunewski Eberhard Schmidt Institute of Particle Technology University of WuppertalGermany

Dynamic image analysis provides an automated evaluation method to determine the size and shape of multiple particles. This method represents a common application for ordinary bulk material. The latest draft of ISO 13322–2:2021 describes the state of the art, but lacks instructions for handling fibrous bulk material. Interlocking fibres complicate the measurement conditions and require a disentanglement of fibrous samples during a pre-dispersion step. A further error source includes the fibre orientation inside the measurement zone of the device. If the thresholding algorithm fails to differentiate between the fibre projection area and the background, a subsequent image optimisation solves the problem. This article addresses the mentioned problems by analysing cotton cellulose and polyacrylonitrile fibres. Besides the execution of a pre-dispersion step, the experiments compare the discrepancies between dry and wet dispersion. Here, the software packages PAQXOS and ImageJ perform the image evaluation. In this case, the wet dispersion setup with a subsequent image evaluation by ImageJ provides comprehensible results.

关键词： Bootstrap method Dynamic image analysis Fibre diameter Fibre length distribution Natural fibres Synthetic fibres

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Training muscles to keep the aging brain fit

引用

Journal of Sport and Health Science 2024年第6期13卷 761-763页

作者： johannes Burtscher Martin Burtscher Department of Biomedical Sciences University of LausanneLausanne CH-1005Switzerland Institute of Sport Sciences University of LausanneLausanne CH-1015Switzerland Department of Sport Science University of InnsbruckInnsbruck A-6020Austria

*** and exercise Aging is associated with the decline of cellular,tissue,and systemic functions and is characterized by at least 7 highly interdependent molecular pillars of aging1(Fig.1).Besides compromised genetic functions(telomer shortening and epigenetic dysregulation),metabolic efficiency(impaired mitochondrial functions and nutrient sensing),and cellular stress responses *** disruption of normal protein regulation(proteostasis)in combination with impaired cellular waste clearance leads to the accumulation of macromolecular damage(and in some cases to specific protein aggregation pathologies,like in Alzheimer’s dementia brains).

关键词： impaired aging aggregation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Unveiling the culprit:the fusobacterium lineage that populates colorectal cancer

引用

Signal Transduction and Targeted Therapy 2024年第6期9卷 2349-2350页

作者： johannes Betge Matthias P.Ebert Department of Medicine Ⅱ Medical Faculty MannheimHeidelberg UniversityMannheimGermany Junior Clinical Cooperation Unit Translational Gastrointestinal Oncology and Preclinical Models German Cancer Research Center(DKFZ)HeidelbergGermany DKFZ Hector Cancer Institute at University Medical Center MannheimGermany MMPU Microbiota Drug Metabolism and Cancer Therapy European Molecular Biology LaboratoryHeidelbergGermany

In a recent study published in Nature,Zepeda-Rivera et al.1 discovered that one distinct clade of Fusobacterium nucleatum animalis(Fna)dominates the colorectal cancer(CRC)tumor *** work unravels a more precise understanding of a major bacterial species associated with CRC progression,thereby establishing a new focus for future studies,which may aid to develop improved microbiome-based diagnostics and treatments(Fig.1).

关键词： colorectal al. cancer

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Wear dependent virtual flow rate sensor for progressing cavity pumps with deformable stator

引用

Petroleum Science 2024年第2期21卷 1346-1353页

作者： Jens Müller Sebastian Leonow johannes Schulz Christian Hansen Martin Monnigmann Ruhr-Universitat Bochum Universit atsstraûe 150Bochum44801Germany SEEPEX GmbH Scharnh olzstraûe 344Bottrop46240Germany

This contribution presents a novel wear dependent virtual flow rate sensor for single stage single lobe progressing cavity pumps. We study the wear-induced material loss of the pump components and the impact of this material loss on the volumetric efficiency. The results are combined with an established backflow model to implement a backflow calculation procedure that is adaptive to wear. We use a laboratory test setup with a highly abrasive fluid and operate a pump from new to worn condition to validate our approach. The obtained measurement data show that the presented virtual sensor is capable of calculating the flow rate of a pump being subject to wear during its regular operation.

关键词： Backflow Progressing cavity pump Virtual sensor Wear

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

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：