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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

Fabrication of a High-Performance and reusable Planar Face Mask in Response to the COVID-19 Pandemic

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Engineering 2022年第2期8卷 101-110页

作者： Shui Hu Hongchi Tian Shijia Zhang Dan Wang Guozhuo Gong Weihua Yue Keyang Liu Song Hong Rui Wang Qingqing Yuan Yonglai Lu Dong Wang Liqun Zhang Jianfeng Chen State Key Laboratory of Organic–Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China Dawn Polymer(Beijing)Technology Co. Ltd.Beijing 101599China Beijing Municipal Institute of Labor Protection Beijing 100054China Beijing Institute of Medical Device Testing Beijing 101111China School of Materials Design and Engineering Beijing Institute of Fashion TechnologyBeijing 100029China

The coronavirus disease 2019(COVID-19)pandemic has caused a surge in demand for face masks,with the massive consumption of masks leading to an increase in resource-related and environmental *** this work,we fabricated meltblown polypropylene(mb-PP)-based high-performance planar face masks and investigated the effects of six commonly used disinfection methods and various mask-wearing periods on the reusability of these *** results show that,after three cycles of treatment using hot water at 70℃ for 30 min,which is one of the most scalable,user-friendly methods for viral disinfection,the particle filtration efficiency(PFE)of the mask remained almost *** mask wearing for 24 h and subsequent disinfection using the same treatment procedures,the PFE decreased to 91.3%;the average number of bacterial and fungal colonies was assessed to be 9.2 and 51.6 colony-forming units per gram(CFU∙g^(-1)),respectively;and coliform and pyogenic bacteria were not *** the PFE and the microbial indicators are well above the standard for reusable masks after *** pho-tography was then used to assess the capabilities of used and disinfected masks during use;it showed that the masks exhibit a high performance in suppressing the spread of breathed air.

关键词： Mask reusable Particle filtration efficiency Disinfection Schlieren photography

Maximum information bits stored in reusable memory

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Chinese Science Bulletin 1995年第15期40卷 1241-1244页

作者：符方伟 Department of Mathematics Nankai University Tianjin 300071 China

Heegard, Ahlswede and Simonyi proposed the general mathematical model ofreusable memory with random noise and error. A probabilistic channel is introduced todescribe the state transmission mechanism of storage element in the reusable memory. Thecoding and capacity problems are studied by using methods in multiuser information theo-

关键词： reusable memory multiuser information theory capacity region infonnation quantity.

Covalently anchored sulfonic acid on silica gel(SiO_2-R-SO_3H)as an efficient and reusable heterogeneous catalyst for the one-pot synthesis of 1,8-dioxooctahydroxanthenes under solvent-free conditions

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Chinese Chemical Letters 2009年第5期20卷 539-541页

作者： Gholam Hossein Mahdavinia Mohammad A.Bigdeli Yaser Saeidi Hayeniaz Department of Chemistry Islamic Azad University-Marvdasht BranchMarvdashtIran Faculty of Chemistry Tarbiat Moalem University49 Mofateh StreetTehranIran

A highly efficient one-pot synthesis of 1,8-dioxooctahydroxanthenes under solvent-free conditions catalyzed by sulfonic acid covalently anchored onto the surface of silica gel is reported. All types of aldehydes, including aromatic, unsaturated, and heterocyclic, are used. The silica gel/sulfonic acid catalyst （SiO2-R-SO3H） is completely heterogeneous and can be recycled.

关键词： 1,8-Dioxooctahydroxanthenes Heterogeneous catalysis SiO2-R-SO3H reusable

An integrated flexible and reusable graphene field effect transistor nanosensor for monitoring glucose

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Journal of Materiomics 2020年第2期6卷 308-314页

作者： Cong Huang Zhuang Hao Tianxu Qi Yunlu Pan Xuezeng Zhao Key Laboratory of Micro-systems and Micro-structures Manufacturing of Ministry of Education Harbin Institute of TechnologyHarbin150001HeilongjiangChina School of Mechatronics Engineering Harbin Institute of TechnologyHarbin150001HeilongjiangChina School of Chemistry and Chemical Engineering Harbin Institute of TechnologyHarbin150001HeilongjiangChina

Diabetes is a chronic metabolic disease that has effect on blood sugar level and affects millions of *** present an integrated flexible and reusable graphene-based field effect transistor(GFET)nanosensor for the detection of glucose using pyrene-1-boronic acid(PBA)as the *** nanosensor fabricated on the polyimide performs GFET-based rapid transduction of the glucose-PBA binding,thereby potentially allowing the detection of glucose that are sampled reliably from human bodily fluids(e.g.,sweat)in wearable sensing *** to the reversible binding interaction between PBA and glucose,reusability of our nanosensor can be realized by exposing graphene surface to acidic *** characterizing the stability and reusability of the nanosensor for wearable applications,we investigated the effects of substrate bending,multiple reuse and long-time storage on the equilibrium dissociation constant between the PBA and *** show that bending,multiple reuse(over 10 times)and long-time storage has negligible effect on the sensing *** detection of glucose with a limit of detection(LOD)of 0.15 μM and a dynamic range of 0.05-100 μM,which covers the reference scope of physical examination or screening of ***,our flexible GFET nanosensor is promising for wearable and reusable biosensing applications.

关键词： Graphene Flexible reusable Glucose sensor Field-effect transistor

Study on the Treatment of reusable Care Equipment in Public and Private Dental Practices in the City of Conakry

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Open Journal of Stomatology 2024年第8期14卷 351-361页

作者： Magna Condé Aly Badara Nabé Moussa Doré Julie Gaëlle Yepmo Sambou Alhassane Alpha Camara Amadou Traoré Kouamé Patrice Attogbain Department of Odontology Faculty of Health Sciences and Techniques Gamal Abdel Nasser University of Conakry Conakry Guinea African Center of Excellence for the Prevention and Control of Communicable Diseases (CEA-PCMT) Faculty of Health Sciences and Techniques Gamal Abdel Nasser University of Conakry Conakry Guinea Department of Odontology and Maxillofacial Surgery Ignace Deen National Hospital Conakry Guinea Department of Pathology and Therapeutics UFR Odonto-Stomatology Flix Houphouet University Boigny Abidjan Cte dIvoire

Introduction: The effective sterilization of reusable instruments in dental care is a crucial issue for public health. The aim of this study was to contribute to improving the processing conditions of reusable care instruments in dental practices in the city of Conakry. Methods: We carried out an observational and cross-sectional study of a descriptive type lasting three months from January to April 2022 in public and private dental practices approved for activities. Results: A total of 48 dental practices were surveyed, including 7 public and 41 private. 91.67% had the trays for instrument sterilization. 77.08% had a sterilization device. The instruments were: cleaned 100%, disinfected 70.83%, sterilized 20.83% and 20.83% reused the instruments without being sterilized. 72.97% sterilized the instruments at the end of the day. 50% of respondents declared that there were six stages of sterilization. According to standard standards, one dental office or 2.70% respected the normal sterilization process and 13.51% respected the duration and temperature. The storage quality was inadequate at 95.83%. 95.83% of dental practices are at high risk of contamination. The difficulties encountered by staff in daily activity during our study were lack of hygienists (87.50%), insufficient material resources (58.33%), and lack of protocol procedure (45.83%). Conclusion: This study allowed us to note shortcomings of dental surgeons in the process of processing reusable care materials.

关键词： Treatment Materials Care reusable Dental Practices Conakry

The Optimal Inventory Policy for reusable Items with Random Planning Horizon Considering Present Value

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Applied Mathematics 2014年第2期5卷 292-299页

作者： Shou-Mei Su Shy-Der Lin Li-Fen Chang Department of Applied Mathematics and Business Administration Chung Yuan Christian University Taiwan Department of Applied Mathematics Chung Yuan Christian University Taiwan Department of Banking and Finance Takming University of Science and Technology Taiwan

We discuss five areas of inventory model, including reusable raw material, EPQ model, optimization, random planning horizon and present value. In the traditional EPQ model, the stock-holding cost of raw material was not counted as a part of relevant cost. We explored the possibility of reducing a company’s impact on the environment and increasing their competitiveness by recycling their repair and waste disposal. The products are manufactured with reusable raw material. Our analysis takes into account the time value, and the present value method is applied to determine the optimal inventory policies for reusable items with random planning horizon. Results show how the heuristic approach can achieve global optimum. Numerical examples are given to validate the proposed system.

关键词： reusable EPQ Optimization Random Planning Horizon Present Value

Study on Feasibility of reusable Rocket Launching Technology by Use of Scramjet and Maglev Technologies

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Aerospace China 2016年第2期17卷 27-36页

作者： ZHAO Jincai GOU Yongjie YIN Liming Shanghai Aerospace Systems Engineering Research Institute Shanghai Rail Traffic Equipment Co. Ltd.

The scramjet and maglev engineering technology development and trends at home and abroad are firstly presented in this paper. A new launch mode of space transportation system is proposed based on scramjet and magnetic suspension technologies, and its key technologies required are given. This paper also makes analysis on using scramjet and magnetic suspension technologies to launch a reusable rocket, and the results show that a normal temperature conductor maglev launch system is feasible.

关键词： Scramjet reusable Launch vehicle Maglev technology Rocket launching technology

Research on Key Technologies for reusable Liquid Rocket Engines

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Aerospace China 2022年第4期23卷 24-34页

作者： LI Bin Academy of Aerospace Propulsion Technology Xi'an 710100

Based on current research,the development trend of reusable liquid rocket engines was *** technologies and research focuses of the reusable liquid rocket engine have been analyzed and summarized,and then suggestions o... 详细信息

关键词： reusable liquid rocket engine development trend key technology