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Glidant effect of hydrophobic and hydrophilic nanosilica on a cohesive powder： Comparison of different flow characterization techniques

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Particuology 2017年第2期15卷 69-79页

作者： ahmad fahmi bin ruzaidi Uttam Kumar Mandal Bappaditya Chatterjee Pharmaceutical Technology Kulliyyah of Pharrnacy IIUM Kuantan 25200 Malaysia

The methods used for flow characterization of a powder mass include the angle of repose （AOR）, Carr index （CI）, and powder flow tester （PFT）. The use of nanosilica as a flow modifier （glidant） is very common in industry. This study aims to compare the glidant effect of hydrophobic and hydrophilic silica on a poorly flowable active pharmaceutical ingredient （ibuprofen） by different flow characterization techniques. Different percentages （0.5, 1.0, and 2.0 wt%） of both types of mixed silica–ibuprofen powders were evaluated by the AOR, CI, bulk density, and PFT. The flow factor, effective angle of friction, and cohesion were determined to explain the bulk powder properties. The results show that different types of silica show different levels of flow property improvement, but the techniques do not equally discriminate the differences. Hydrophobic silica results in better improvement of the flow property than hydrophilic silica, probably because of its better surface coverage of silica on the host particles. Change of the bulk density with applied pressure was significant for the different powders. This study demonstrates that combining several characterization methods provides a better understanding of bulk powder flow properties with respect to powder–process relationships than a single flow indicator.

关键词： Silica Flow measurement Shear flow tester Cohesion Effective angle of friction Bulk density

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Real-Time Control System Adopted to Energy Storage for Smart Grid Low Wind Applications:A Part of Distributed Renewables in Smart City

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Journal of Electronic Science and Technology 2021年第4期19卷 379-389页

作者： MD Shahrukh Adnan Khan Yoong Choon Chang Md Ashraful Kabir Muhammad Izuan fahmi bin Romli Chockalingam Aravind Vaithilingam Jakir Hosain with the Department of Electrical and Electronic Engineering Canadian University of BangladeshDhaka 1212 with the Department of Electrical&Electronic Engineering Universiti Tunku Abdul RahmanKamper 31900 with the Department of Computer Science&Engineering Canadian University of BangladeshDhaka 31900 with the Department of Electrical and Electronic Engineering University Malaysia PerlisPerlis 01000 with the Department of Electrical and Electronic Engineering Taylor’s UniversityKuala Lumpur 47500 with the School of Science&Engineering Canadian University of BangladeshDhaka 1212

In this paper,extensive efforts have been undertaken to design and develop a control system,which is incorporated with an energy storage device that can store energy from low-voltage renewable *** developed device acts as a storage element,which can be used to charge small-scale batteries,cellular devices,and other applications in remote places where the grid connection is not *** circuit is developed using a case-by-case *** order to solve the low output voltage problem,a bipolar junction transistor-metal oxide semiconductor field-effect transistor(BJT-MOSFET)based switch control technology with the Arduino microcontroller has been *** developed control system is extremely efficient in charging batteries through a supercapacitor for low-voltage *** this research,a small-scale 200-W portable vertical axis wind turbine is used at a wind speed of 3 m/*** result shows the efficiency of the proposed system as compared with the conventional *** proposed system can be an important tool of the latest distributed energy generation technology which is an important part of a smart ***,the limitations and future scopes of the development of the control device are discussed for the future *** important future scope identified is to integrate the Internet of Things based mobile interface for remote monitoring for any kind of pandemic situation like ***,it is high time to get our smart city concept aligned with the post COVID pandemic situation and get us prepared smartly for similar future occurrences.

关键词： Energy storage low-voltage application novel control system post pandemic smart city

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Intraday Lead-Lag Relationship between Index Futures and Stock Index Markets:Evidence from Malaysia

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Journal of Modern Accounting and Auditing 2018年第10期14卷 561-569页

作者： Jude W. Taunson Mohd. fahmi bin Ghazali Minah Japang Abd. Kamal bin Char Universiti Malaysia Sabah SabahMalaysia

This paper investigates the lead-lag relationship between the stock index futures(known as FKLI)and its underlying index,the Kuala Lumpur Composite Index(KLCI)in the emerging Malaysian *** 15-second interval data,cross-correlation,and the partial adjustment model,we find a bi-directional asymmetric lead-lag relationship and that the KLCI’s lead over FKLI is much *** evidence also suggests that the KLCI returns over-react to information,more so once thin trading effects are ***,the evidences suggest that traders prefer to exploit stock specific information in the underlying market despite the advantages of trading the index futures.

关键词： lead-lag relations index futures emerging market

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Radiographic Equipment and Accessories as a Potential Source of Nosocomial Infection

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Open Journal of Radiology 2024年第3期14卷 147-155页

作者： Lina fahmi Hammad Essam Hussain Mattar Hanadi Talal Ahmedah Mohamed Zain Shamweel ahmad Hiba Shamweel Radiological Sciences Department College of Applied Medical Sciences King Saud University Riyadh KSA Department of Medical Laboratory Technology Faculty of Applied Medical Sciences King Abdulaziz University Rabegh KSA Botany and Microbiology Department College of Science King Saud University Riyadh KSA Department of Medical Laboratory Sciences College of Medical Sciences Prince Sattam Bin Abdulaziz University Al Kharj KSA Al-Haram Diagnostic Research and Training Center Srinagar Kashmir

Background: Nosocomial infections have become a major challenge in healthcare facilities as they affect the quality of medical care. Radiological imaging plays a crucial role in medical diagnosis. However, the equipment and accessories used increase the risk of transmission of nosocomial bacteria. Objective: This study aims to reveal the extent and nature of microbiological contamination in four hospital diagnostic imaging departments to determine their potential role in the spread of nosocomial bacteria and to evaluate the effectiveness of routine daily disinfection practices in controlling microorganisms in diagnostic imaging departments. Methods & Results: In each department, swabs were taken from the surfaces of selected parts of the equipment and accessories three times a day (early morning, noon, and evening) for five consecutive days. Bacteria were isolated from 65 swabs (36.1% of all samples). The bacteria were isolated 3 times (4.6%) in the morning, 16 times (24.6%) at midday, and 46 times (70.7%) in the evening. The bacteria isolated were Escherichia coli (isolated 34 times;52.3%), Staphylococcus aureus (20 times;30.8%), Staphylococcus epidermidis (6 times;9.3%), and Klebsiella species (5 times;7.7%). Discussion & Conclusion: Findings demonstrated that radiology equipment and accessories are not free of bacteria and further improvements in the sterilization and disinfection of radiology equipment and accessories are needed to protect staff and patients from nosocomial infections.

关键词： Diagnostic Imaging Department Nosocomial Infection Radiographic Accessories Radiographic Equipment

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随机变温作用下徐变对预应力混凝土梁桥结构行为的影响

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公路交通科技 2017年第12期34卷 82-89页

作者：鲁薇薇杨永清李晓斌西南交通大学土木工程学院四川成都610031

结合在自然环境条件下开展徐变试验和既有研究成果,对现有可考虑温度影响的徐变模型包括fahmi提出的基于时间-温度等效原理的徐变模型、CEB-FIP(1990)模型、BP模型、B3模型和组合徐变模型进行比选,并将比选出的组合徐变模型应用于预应... 详细信息

结合在自然环境条件下开展徐变试验和既有研究成果,对现有可考虑温度影响的徐变模型包括fahmi提出的基于时间-温度等效原理的徐变模型、CEB-FIP(1990)模型、BP模型、B3模型和组合徐变模型进行比选,并将比选出的组合徐变模型应用于预应力混凝土梁桥的徐变效应分析中。假定徐变符合弹性徐变理论,基于初应变法解决了应用组合徐变模型进行桥梁结构徐变效应分析的问题。通过将基于组合徐变模型和依据我国公路04桥规分析得到的桥梁结构变形、应力和预应力损失结果进行比较,探究忽略实际变温对徐变影响可能导致的桥梁结构行为估算偏差。研究结果表明:考虑实际环境变温影响的徐变系数预测值与试验值更为贴近,现行徐变模型因未计入环境变温影响,可能低估了冬季和春季浇注混凝土的徐变,高估了夏季和秋季浇注混凝土的徐变;在考虑自然环境温度影响的徐变作用下,梁体下挠度可较规范值大约15.5 mm,截面应力与规范值的最大相对偏差约为10%,预应力损失可较规范值大约40%以上。随机变温作用下混凝土徐变,加剧了桥梁梁体持续下挠、混凝土开裂和预应力损失等问题。因此,在桥梁结构设计中推荐采用组合徐变模型计入实际环境变温对结构混凝土徐变行为的影响,从而为预应力束的合理布置与张拉控制、梁体预拱度的准确设置等方面提供参考。

关键词：桥梁工程徐变效应分析组合徐变模型预应力混凝土梁桥随机变化温度

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