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A passive,reusable,and resonating wearable sensing system for ondemand,non-invasive,and wireless molecular stress biomarker detection

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Nano Research 2024年第8期17卷 7542-7556页

作者： Shingirirai Chakoma Xiaochang Pei Huiting Qin Anita Ghandehari sahar NajafiKhoshnoo Jerome Rajendran rahim Esfandyarpour Department of Electrical Engineering and Computer Science University of CaliforniaIrvineCA 92697USA Laboratory for Integrated Nano BioElectronics Innovation The Henry Samueli School of EngineeringUniversity of CaliforniaIrvineCA 92697USA Henry Samueli School of Engineering University of CaliforniaIrvineCA 92697USA

The significant impact of stress on health necessitates accurate assessment methods,where traditional questionnaires lack reliability and *** advancements like wearables with electrocardiogram(ECG)and galvanic skin response(GSR)sensors face accuracy and artifact *** biosensors detecting cortisol,a critical stress hormone,present a promising ***,existing cortisol assays,requiring saliva,urine,or blood,are complex,expensive,and unsuitable for continuous *** study introduces a passive,molecularly imprinted polymer-radio-frequency(MIP-RF)wearable sensing system for real-time,non-invasive sweat cortisol *** system is wireless,flexible,battery-free,reusable,environmentally stable,and designed for long-term monitoring,using an inductance-capacitance *** transducer translates cortisol concentrations into resonant frequency shifts with high sensitivity(~160 kHz/(log(μM)))across a physiological range of 0.025–1μ*** with near-field communication(NFC)for wireless and battery-free operation,and threedimensional(3D)-printed microfluidic channel for in-situ sweat collection,it enables daily activity cortisol level *** of cortisol circadian rhythm through morning and evening measurements demonstrates its effectiveness in tracking and monitoring sweat cortisol levels.A 28-day stability test and the use of cost-effective 3D nanomaterials printing enhance its economic viability and *** innovation paves the way for a new era in realistic,on-demand health monitoring outside the laboratory,leveraging wearable technology for molecular stress biomarker detection.

关键词： cortisol wearable flexible sensors three-dimensional(3D)nanomaterials printing reusable environmentally stable

Recent advances in lung-on-a-chip technology for modeling respiratory disease

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生物设计与制造(英文) 2023年第5期6卷 563-585页

作者： Jorge A.Tavares-Negrete Prativa Das sahar Najafikhoshnoo Steven Zanganeh rahim Esfandyarpour Department of Electrical Engineering University of CaliforniaIrvineCA 92697USA Department of Biomedical Engineering University of CaliforniaIrvineCA 92697USA Henry Samueli School of Engineering University of CaliforniaIrvineCA 92697USA Laboratory for Integrated Nano Bio Electronics Innovation Henry Samueli School of EngineeringUniversity of CaliforniaIrvineCA 92697USA Department of Mechanical and Aerospace Engineering University of CaliforniaIrvineCA 92697USA Department of Bioengineering University of Massachusetts DartmouthDartmouthMAUSA

Tissue engineering approaches,including those to functional lung tissues,are finely honed by the inclusion of upgraded devices that mimic biophysical and biochemical features in *** culture is one of these essential biophysical characteristics enabled by the introduction of microfluidic devices in recent *** review links the importance of dynamic culture for in vitro maintenance of functional lung cells to the modeling of respiratory *** identify and discuss different parameters for fabricating the requisite microfluidic models for lung cells,as well as their application in modeling lung diseases caused by external factors such as smoking and *** possibility of creating a multi-organ-on-a-chip to establish a more physiologically relevant model is ***,the focus is on different prospects for the in vitro modeling approach and for lungs-on-a-chip for developing advanced,reliable technology to analyze the pathophysiology of respiratory diseases and screen potential treatments.

关键词： Lung-on-a-chip In vitromodeling Lung pathophysiology Respiratory diseases 3D culturemodel

Bilateral Coupled Epsilon Negative Metamaterial for Dual Band Wireless Communications

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Computers, Materials & Continua 2022年第4期71卷 1263-1281页

作者： md Mhedi Hasan Mohammad Tariqul Islam md Moniruzzaman Mohd Hafiz Uddin Norsuzlin Binti Mohd sahar md Samsuzzaman Department of Electrical Electronic and Systems Engineering Faculty of Engineering and Built EnvironmentUniversiti Kebangsaan MalaysiaSelangor43600Malaysia Space Science Centre Institute of Climate ChangeUniversiti Kebangsaan MalaysiaSelangor43600Malaysia Department of Computer and Communication Engineering Faculty of Computer Science and EngineeringPatuakhali Science and Technology UniversityPatuakhali8602Bangladesh

This work presents a dual band epsilon negative(ENG)metamaterial with a bilateral coupled split ring resonator(SRR)for use in C and X band wireless communication *** traditional split-ring resonator(SRR)has been amended with this engineered *** proposed metamaterial unit cell is realized on the 1.6 mm thick FR-4 printed media with a dimension of 10×10 *** resonating patch built with a square split outer *** interlinked inner rings are coupled vertically to the outer ring to extend its electrical length as well as to tune the resonance *** simulation is performed using CST studio suite 2019 to design and performance *** transmission coefficient(S21)of the proposed unit cell and array configuration exhibits two resonances at 6.7 and 10.5 GHz with wide bandwidth extended from 4.86 to 8.06 GHz and 10.1 to 11.2 GHz,*** permittivity is noted at frequencies between 6.76–9.5 GHz and 10.5–12 GHz,consecutively,with near-zero refractive index and *** optimal EMR value depicts the compactness of the proposed *** 1×2,2×2 and 4×4 arrays are analyzed that shows similar response compared to the unit *** results of the 2×2 array shows the close similarity of S21 response as compared to *** observed properties of the proposed unit cell ascertain its suitability for wireless communications by enhancing the gain and directivity of the antenna system.

关键词： Metamaterial epsilon negative near-zero index split ring resonator wireless communications

The Influence of Power Control on the Diameter of Nd：YAG Crystal

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材料科学与工程（中英文A版） 2011年第1X期1卷 93-97页

作者： Wan Hairul Anuar Kamaruddin md Supar Rohani md.rahim sahar Advanced Optical Material Research Laboratory Physics Department Faculty of Science Universiti Teknologi Malaysia 81310 UTM Skudai Johor Malaysia

The Nd: YAG crystal has successfully been grown in a pure argon atmosphere using Czochralski method with ADC (Automatic Diameter Control) r. f. heating. The effect of power control on growth parameters, which include the crystal rotation rate, pull rate and hot-zone geometries were investigated. A series of experiments were run with the rotation speed of the seed were 2 – 15 rpm and the pulling rate was kept constant at 0.75 mm/hr. All runs were made with growth along the c-axis direction. The result shows that lowering the power control will accelerate the crystallization and larger the diameter and/or increasing the power control will decrease or smaller the diameter.

关键词： ND:YAG晶体自动直径控制电力控制电源控制生长参数旋转速率几何形状旋转速度

Polarization Insensitive Broadband Zero Indexed Nano-Meta Absorber for Optical Region Applications

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Computers, Materials & Continua 2022年第4期71卷 993-1009页

作者： Ismail Hossain md Samsuzzaman Ahasanul Hoque Mohd Hafiz Baharuddin Norsuzlin Binti Mohd sahar Mohammad Tariqul Islam Space Science Center(ANGKASA) Universiti Kebangsaan Malaysia43600UKM BangiSelangorMalaysia Department of Computer and Communication Engineering Faculty of Computer Science and EngineeringPatuakhali Science and Technology UniversityDumki8602PatuakhaliBangladesh Department of Electrical Electronic and Systems EngineeringFaculty of Engineering and Built EnvironmentUniversiti Kebangsaan Malaysia43600UKM BangiSelangorMalaysia

Broadband response metamaterial absorber(MMA)remains a challenge among researchers.A nanostructured new zero-indexed metamaterial(ZIM)absorber is presented in this study,constructed with a hexagonal shape resonator for optical region *** design consists of a resonator and dielectric layers made with tungsten and quartz(Fused).The proposed absorbent exhibits average absorption of more than 0.8972(89.72%)within the visible wavelength of 450–600 nm and nearly perfect absorption of 0.99(99%)at 461.61 *** on computational analysis,the proposed absorber can be characterized as *** developments of ZIM absorbers have demonstrated plasmonic resonance characteristics and a perfect impedance *** incidence obliquity in typically the range of 0◦–90◦both in TE and TM mode with maximum absorbance is more than 0.8972(∼89.72%),and up to 45◦angular stability is suitable for solar cell applications,like exploiting solar *** proposed structure prototype is designed and simulated by studying microwave technology numerical computer simulation(CST)*** finite integration technique(FIT)based simulator CST and finite element method(FEM)based simulator HFSS also helps validate the numerical data of the proposed ZIM *** proposed MMA design is appropriate for substantial absorption,wide-angle stability,absolute invisible layers,magnetic resonance imaging(MRI),color images,and thermal imaging applications.

关键词： Hexagonal resonator loaded star shaped polarization insensitive compact broadband metamaterial absorber optical region applications

Computational Investigation of Multiband EMNZ Metamaterial Absorber for Terahertz Applications

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Computers, Materials & Continua 2022年第5期71卷 3905-3920页

作者： Ismail Hossain md Samsuzzaman Mohd Hafiz Baharuddin Norsuzlin Binti Mohd sahar Mandeep Singh Jit Singh Mohammad Tariqul Islam Space Science Center Universiti Kebangsaan Malaysia43600UKM BangiSelangorMalaysia Department of Computer and Communication Engineering Faculty of Computer Science and EngineeringPatuakhali Science and Technology UniversityBangladesh Department of Electrical Electronic and Systems EngineeringFaculty of Engineering and Built EnvironmentUniversiti Kebangsaan MalaysiaMalaysia

This study presents an Epsilon Mu near-zero(EMNZ)nanostructured metamaterial absorber(NMMA)for visible regime *** resonator and dielectric layers are made of tungsten(W)and quartz(fused),where the working band is expanded by changing the resonator layer’s *** to perfect impedance matching with plasmonic resonance characteristics,the proposed NMMA structure is achieved an excellent absorption of 99.99%at 571 THz,99.50%at 488.26 THz,and 99.32%at 598 THz *** absorption mechanism is demonstrated by the theory of impedance,electric field,and power loss density distributions,*** geometric parameters are explored and analyzed to show the structure’s performance,and a near-field pattern is used to explain the absorption mechanism at the resonance frequency *** numerical analysis method describes that the proposed structure exhibited more than 80%absorbability between 550 and 900 *** Computer Simulation Technology(CST Microwave Studio 2019)software is used to design the proposed ***,CSTHFSS interference is validated by the simulation data with the help of the finite element method(FEM).The proposed NMMA structure is also exhibits glucose concentration sensing capability as *** the proposed broadband absorber may have a potential application in THz sensing,imaging(MRI,thermal,color),solar energy harvesting,light modulators,and optoelectronic devices.

关键词： Metamaterial absorber terahertz applications multiband EM near zero nanostructured visible regime applications

Cullet-Clay Brick from Recycle Glass

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材料科学与工程（中英文版） 2011年第3期5卷 293-297页

作者： md. rahim sahar Munirah Mohd Razi Advanced Optical Material Research Group Department of Physics Faculty of Science Universiti Teknologi Malaysia 81310Skudai Johor Malaysia

Series of cullet-clay based ceramic from (100-x) cullet-(x) clay has successfully been made using a slip casting process before undergoing solid state reaction. The sample’s density has been determined by using Archimedes method while their hardness has been determined by Vickers hardness test. The Young modulus also has been determined and the ceramic crystallinity has been observed using the x-ray diffraction method. It is found out that the density of the samples is in the range of 2.05-2.20 g·cm-3 depending on the amount of cullet used. Meanwhile the hardness is observed to be around 65.71-240.3 MPa and is compositional dependence. The Young modulus is found to be around 309.9-650.8 MPa and is in the increasing trend as the amount of cullet is increased. The x-ray diffraction analysis showed that the ceramic is composed of silicate compound but the amount varies with the clay content.

关键词：碎玻璃粘土砖维氏硬度试验射线衍射分析回收杨氏模量阿基米德法复合硅酸盐

Physical and Mechanical Properties of Ceramic-Based Recycled Paper-Cullet-Clay

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材料科学与工程（中英文版） 2011年第4期5卷 447-450页

作者： md.rahim Bin sahar Khamisah Binti Abu Samah Advanced Optical Material Research Group Department of Physics Faculty of Science Universiti Teknologi Malaysia Skudai81310 Johor Malaysia

A series of ceramic based on (x) recycle paper - (80-x) cullet–20 Kaolin clay (where 10 ≤ x ≤45wt%) has successfully been made by slip casting technique followed by sintering at 1000 °C. The ceramic density has been determined using Archimedes method while their hardness has been tested using Vickers hardness test method. The Young Modulus of the sample has also been determined using Universal Testing Machine and the existence of major phase in incinerate recycle paper has been determined by Energy dispersive analysis of X-ray (EDAX). It is found that the sample density is around 2.17 gcm-3 to 2.42 gcm-3 while their hardness are in the range of 144.2 MPa to 541.3 MPa, increases with the increased of cullet content. The Young Modulus is observed to be about 195.4 MPa to 603.4 MPa and is very much depend on the cullet content, while the EDAX shows that the major phase of the incinerated recycle paper contained around 56% of SiO2, 31% Al2O3 and 10% CaO depending on the composition.

关键词： Recycle paper glass cullet kaolin clay mechanical properties

Physicians’ Perception of Drug Information Resources in the Emirate of Abu Dhabi-UAE

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Pharmacology & Pharmacy 2013年第1期4卷 52-56页

作者： Hadaya Gharibyar Yasser Sharif Kefah Al Qawasme sahar Fahmy Assistant Professor College of Pharmacy Helwan University Cairo Egypt Head Medication & Medical Products Safety Section Health Authority Abu Dhabi UAE Medication Safety Officer Health Authority Abu Dhabi UAE

Objectives: To determine physicians’ preferences for different drug information resources in the United Arab Emirates. Methods: A questionnaire survey to determine preferences for different drug information resources was created and sent electronically from April 1 to May 13, 2012. A total of 3463 licensed physicians were identified from a comprehensive list of healthcare professionals provided by the Health Authority-Abu Dhabi Licensing Department. A total of 431 started the survey but only 372 physicians completed it entirely. Key Findings: Continuing medical education (46%) was ranked as the most favored source of information, followed by drug information references (28%), diagnosis/patient information (20%), and lastly peer-to-peer interactions (7%). Online sources of drug information were preferable (74%) to hardcopy (26%). A comparison of different physicians’ qualifications (consultant, specialist, and general practitioner) and number of references utilized for a particular topic (up to 3 resources versus 3 references or more) showed that their differences were statistically significant (p-value = 0.000). The most utilized sources of drug information by physicians was the British National Formulary (BNF), followed by Package Inserts, UpToDate, Drugs in Pregnancy & Lactation, Physicians’ Desk Reference, and Micromedex. When asked which drug information resource they would like to have access to, the majority of physicians choose the BNF, followed by UpToDate, md Consult, Drugs in Pregnancy & Lactation, Micromedex, and Drugs Facts & Comparisons. Physicians from Europe/USA/Australia spent less time utilizing drug information resources (p-value of 0.013) compared to other nationalities. Conclusion: Preferences for different drug information resources did not vary significantly even amongst a diverse group of expatriate physicians licensed to practice in the United Arab Emirates.

关键词： Drug Information Abu Dhabi United Arab Emirates Physicians Medical Information