Bangladesh Journal of Medical Physics最新文献_第2页

Effect of top cover tilt angle with ground surface on productivity of basin type solar distillation unit 顶盖与地面倾角对盆式太阳能蒸馏装置生产效率的影响

Bangladesh Journal of Medical Physics Pub Date : 2018-12-03 DOI: 10.3329/bjmp.v10i1.39149

H. Begum, M Abu Yousuf, K. S. Rabbani

引用次数: 1

Development of Low Cost Miniature USB Based Data Acquisition System for Biomedical Instrumentation 低成本微型USB生物医学仪器数据采集系统的研制

Bangladesh Journal of Medical Physics Pub Date : 2018-12-03 DOI: 10.3329/bjmp.v10i1.39146

A. Amin, K. S. Rabbani

{"title":"Development of Low Cost Miniature USB Based Data Acquisition System for Biomedical Instrumentation","authors":"A. Amin, K. S. Rabbani","doi":"10.3329/bjmp.v10i1.39146","DOIUrl":"https://doi.org/10.3329/bjmp.v10i1.39146","url":null,"abstract":"In biomedical instrumentation, computer based data acquisition system is required for recording of physiological parameters and bioelectric signals, which allows signal processing, display, analysis and storage in digital media. However, Most of the commercially available PC based Data Acquisition systems are of very high cost and requires specific commercial software, again at a very high cost. Moreover, if the data is not stored in raw binary or known format, it is not possible for the user to use the data in other system or software of their own choice. Therefore, a low cost, simple and open source PC based data acquisition system for biomedical application would be very useful for biomedical instrument developers and researchers in the low resource countries. In this work, we present such development of data acquisition system. The developed system utilizes an 8-bit ordinary low cost microcontroller and some electronic circuit component to develop the data acquisition system and implementation of USB 1.1 (Universal Serial Bus) interface to PC. The onboard 10-bit ADC of the microcontroller was used for analog data sampling. Two sampling and data transfer mode is implemented, (i) Continuous mode with low sampling rate (800 sample/sec) and practically real time plotting and (ii) Batch mode, with high sampling rate (76.9 k sample/sec) but with batch type plotting. To evaluate the system, PC side GUI (Graphical User Interface) software was also developed. The GUI of system shows that a test sinusoidal signal is reproduced very nicely without any amplitude and phase distortion within the frequency band of 1 to 10 KHz. The system is suitable for low frequency bioelectric signals like ECG, EEG etc. and as well as high frequency signal like EMG, NCV etc. The system is low cost, miniature, simple, and efficient and being used in several indigenously developed medical devices like ECG, EMG, NCV and FIM [Rabbani et al, 1999] at the authors’ department with excellent satisfactory results.Bangladesh Journal of Medical Physics Vol.10 No.1 2017 1-11","PeriodicalId":134261,"journal":{"name":"Bangladesh Journal of Medical Physics","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132815500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of top cover material on productivity of solar distillation unit 顶盖材料对太阳能蒸馏装置生产效率的影响

Bangladesh Journal of Medical Physics Pub Date : 2018-07-04 DOI: 10.3329/BJMP.V9I1.37303

H. Begum, M Abu Yousuf, K. S. Rabbani

{"title":"Effect of top cover material on productivity of solar distillation unit","authors":"H. Begum, M Abu Yousuf, K. S. Rabbani","doi":"10.3329/BJMP.V9I1.37303","DOIUrl":"https://doi.org/10.3329/BJMP.V9I1.37303","url":null,"abstract":"This work was taken up to design a cost effective and simple domestic scale solar water distillation device for use in the coastal villages of Bangladesh where saline free drinking water is scarce. This study mainly looked at the feasibility of using stretched transparent PVC cover in solar distillation devices in lieu of traditionally used transparent glass sheet. To increase total evaporative surface area of the bottom of stills, those were covered with black cotton fabrics with extended fibers. For the same angle of inclination (130) of the transparent cover, the average amount of distilled water produced by the transparent PVC sheet covered still was about 42% of that collected from a glass sheet covered still. The reason behind this poor performance could be traced to the increased surface adhesion of condensed water droplets with the PVC cover, which essentially scattered sunrays away from the solar still. So the way to go is to find a suitable plastic sheet material that has reduced surface adhesion to water or to find a coating material that can reduce surface adhesion too. Unless this can be done, traditional glass covered solar distillation device still remains the cover material of choice.Bangladesh Journal of Medical Physics Vol.9 No.1 2016 11-16","PeriodicalId":134261,"journal":{"name":"Bangladesh Journal of Medical Physics","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122059923","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

Changes in the distribution of F-latency (DFL) for different postures of head and neck 不同头颈体位f -潜伏期分布的变化

Bangladesh Journal of Medical Physics Pub Date : 2018-07-04 DOI: 10.3329/BJMP.V9I1.37302

S. Sharmin, K. S. Rabbani

{"title":"Changes in the distribution of F-latency (DFL) for different postures of head and neck","authors":"S. Sharmin, K. S. Rabbani","doi":"10.3329/BJMP.V9I1.37302","DOIUrl":"https://doi.org/10.3329/BJMP.V9I1.37302","url":null,"abstract":"Distribution of F-Latency (DFL) is a new neurological parameter conceived by the Biomedical Physics group of Dhaka University. Previous experimental studies have indicated that DFL, obtained from median nerve, varies with postures of the subject, particularly with the bending of the head. It agreed with the contention that bending of head might produce compression or stretching of nerve fibers as they come out of the vertebra, and that DFL is a sensitive parameter that gets affected by even such temporary changes. The present work was taken up with two objectives, i) to improve upon the earlier work by taking measurements with a few specific angles of head bending, particularly in the left and right directions, and ii) to provide a verification of earlier results. For bending of head to left and right sides, we chose 300 and 450 respectively. For forward and backward directions the angles were not measured and the subjects were asked to bend as much as they could without going beyond a comfort level. The study was carried out on 6 student volunteers aged between 24 and 26. The DFLs obtained with different postures of the head were analyzed to look for systematic trends in the changes, if any. Changes in several parameters like peak, mean, standard deviation, skewness and half-width in the rising and falling edges (down to 50 % height of the peak) were studied for different postures of head and neck which showed consistent changes.Bangladesh Journal of Medical Physics Vol.9 No.1 2016 1-10","PeriodicalId":134261,"journal":{"name":"Bangladesh Journal of Medical Physics","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126327391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Development of an electrical impedance based spirometer 基于电阻抗的肺活量计的研制

Bangladesh Journal of Medical Physics Pub Date : 2018-07-04 DOI: 10.3329/BJMP.V9I1.37304

Md Anas Ali, M. A. Kadir, K. S. Rabbani

{"title":"Development of an electrical impedance based spirometer","authors":"Md Anas Ali, M. A. Kadir, K. S. Rabbani","doi":"10.3329/BJMP.V9I1.37304","DOIUrl":"https://doi.org/10.3329/BJMP.V9I1.37304","url":null,"abstract":"Spirometry, or measurement of respiration conventionally involves measurement of the time variation of volume or flow of air breathed in or out through the mouth using an air-flow sensor. Electrical impedance of thorax changes during breathing and conceptually this modality should be applicable in spirometry, but no attempts have been made so far. This paper describes the development of an electrical impedance based spirometer placing electrodes on four limbs so that the whole lung volume may contribute to the measurement. An impedance based measurement system (IBS) consisting of a constant current drive at 11 kHz and necessary voltage measurement circuitry was designed and developed for this purpose. A portable oscilloscope (PicoScope 2208A) was used for acquisition of the measured voltage signal to a PC and an algorithm in Matlab software was used to demodulate the time varying impedance from a carrier signal. The variation of impedance with time during forced expiration as measured by the implemented impedance measurement system was compared with that obtained using a standard bellows type commercial spirometer (Vitalograph) on eight volunteers, between 22 and 32 years of age. The subjects included smokers, non-smokers, and asthma patients. Repeatability of the measurements were satisfactory. The correlation coefficient between the spirogram obtained using the IBS and that obtained using standard spirometer varied from 0.81 to 0.99 indicating preliminary success of the proposed technique. However, a possible source of error is the bending of the body during forced expiration which, if prevented, may give a better outcome.Bangladesh Journal of Medical Physics Vol.9 No.1 2016 17-27","PeriodicalId":134261,"journal":{"name":"Bangladesh Journal of Medical Physics","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116868279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0