High Sensitivity Research Papers - Academia.edu (original) (raw)

The effect of corrosive solutions on stress relaxation behavior of pure Mg and its alloys is studied. Pure magnesium shows a crucial corrosion stress relaxation in 3.5wt.% NaCl even at room temperature in comparison with tests in air. Die-cast Mg alloys AZ91D, AM50 and AS21 at room temperature show a relatively small stress decrease both in air and in different

- by Emmanuel Gutman
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- Stress relaxation, Magnesium, Dislocations, Grain Boundary
- by Patrick Bertrand
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- Analytical Chemistry, Biomedical Engineering, Biosensors, Chitosan
- by Jerzy Karpiuk
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- Materials Engineering, Condensed Matter Physics, Fluorescence, Time Resolved
- by Vishal Shinde
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- Mechanical Engineering, Civil Engineering, Signal Processing, Structural Health Monitoring
- by Kiran Soma
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- Physiology, Zoology, Animal Behavior, Reproduction
- by Sheridan Mayo
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- Engineering, Fluorescence Microscopy, Trace Metals, Titanium
- by Jose Luis Hormaechea
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- Argentina, Multidisciplinary, System Design, Radars
- by Mohamed Walash
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- Engineering, Chemical Engineering, Analytical Chemistry, Colorimetry
- by mingjie zhou
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- Analytical Chemistry, Kinetics, Fluorescence, Humans
- by Hossein Afarideh and +1
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- Materials Engineering, Nanotechnology, UV light, Low Temperature
- by bahareh khodadadi
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- Thin Film, Gas Sensor, High Sensitivity, Sol Gel Method
- by Salvatore Giannetto and +1
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- Microbiology, Parasitology, Medical Microbiology, Cats
- by Takaaki Aoki
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- Geochemistry, Secondary Ion Mass Spectrometry, Time of Flight, Interdisciplinary Engineering
- by Kamal Dasgupta
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- Materials Engineering, Low Dose, Non crystalline solids, Dose rate
- by Jens Hornung
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- Geology, Geomorphology, Climate Change, Ground Penetrating Radar
- by REZA VALIZADEH
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- Geochemistry, Chemistry, Interdisciplinary Engineering, Ion Beam
- by Janardan Lamichhane
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- Respiratory Disease, Avian Influenza, Bird Flu, influenza A virus
- by James FM F Meaney
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- Cognition, Aging, Electroencephalography, Diarrhea
- by Undurti Das
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- Epidemiology, Obesity, Anthropometry, Physical Activity
- by Santhosh KV and +1
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- Thermal Conductivity, Mathematical Model, Capacitive Pressure Sensor, Pressure Sensor

TiO2 and SnO2 are the well-known sensing materials with a good thermal stability of the former and a high sensitivity of the latter. Carbon nanotubes (CNTs) have also gas sensing ability at room temperature. CNTs-included SnO2/TiO2 material was a new exploration to combine the advantages of three kinds of materials for gas-sensing property. In this work, a uniform SnO2/TiO2 solution was prepared by the sol gel process with the ratio 3:7 in mole. The CNTs with contents in the range of 0.001 0.5 wt% were dispersed in a mixed SnO2/TiO2 matrix by using an immersion-probe ultrasonic. The SnO2 TiO2 and the CNTs-included SnO2 TiO2 thin films were fabricated by the sol gel spin-coating method over Pt-interdigitated electrode for gas-sensor device fabrication and they were heat treated at 500 °C for 30 min. FE-SEM and XRD characterizations indicated that the inclusion of CNTs did not affect the particle size as well as the morphology of the thin film. The sensing properties of all as-fabricated sensors were investigated with different ethanol concentrations and operating temperatures. An interesting sensing characteristic of mixed SnO2/TiO2 sensors was that there was a two-peak shape in the sensitivity versus operating temperature curve. At the region of low operating temperature (below 280 °C), the hybrid sensors show improvement of sensing property. This result gives a prospect of the stable gas sensors with working temperatures below 250 °C.

- by Nguyen Van Hieu
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- Materials Engineering, Carbon Nanotube, Nanotechnology, Sol Gel Process

Recently, a novel approach to a highly sensitive and quantitative detection of rare earth element (REE) ions including La3+, Eu3+ and Tb3+, by the polymerase chain reaction (PCR) technique, has been reported. The detection of REE ions is based on the catalytic nature of REE ions targeting the deoxyribonucleic acid (DNA), thus monitoring of the ions can be achieved by reading the level of intact DNA by PCR. Despite of its high sensitivity (at ppb to ppt levels), the conventional PCR-based REE detection protocol requires certain length of time (1-2 hours). In the present study, we modified the PCR-based REE detection protocols by employing the high-speed PCR, and performed the automated and rapid detection of La3+ in small-sized aqueous samples within 5min.

- by Tomonori Kawano
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- Environmental Engineering, Biochemistry, Marine Biology, Microbiology
- by Stephen Holness
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- Geology, Geomorphology, Climate Change, Climate
- by Remo Sanges
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- Engineering, Zoology, Technology, Biotechnology
- by J Hibbeln
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- Humans, Stable Isotope, Clinical Sciences, Adult
- by Hanna Pawlowska and +2
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- Remote Sensing, Climate Change, Atmospheric Science, Atmospheric sciences

The paper describes the results of studies on the fabrication and characterisation of a thick-film humidity sensor based on the semiconducting metal oxide MnWO4. The sensor element possesses a novel ‘sandwich’-configuration with a 40 μm porous MnWO4 ceramic layer sandwiched by two 10 μm polarity-reversed, interdigitated metal films. Instead of traditional glass frits, LiCl powders are used as adhesion promoters

- by Jörg-Uwe Meyer
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- Materials Engineering, Analytical Chemistry, Humidity Sensor, Particle Size
- by Carlos Mateus
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- Biosensors, Photonics, Molecular Biophysics, Photodetectors
- by Oguz Akyuz
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- High Dynamic Range Imaging, High Dynamic Range, Noise reduction, Image Enhancement

Rapid advances in biosensors have recently been reported. This has been possible due to rapid growth in the development of new biomaterials such as conducting polymers, copolymers and sol gels etc and the reported improvements in sensing techniques. Biosensors are miniaturized devices employing biochemical molecular recognition as the basis for a selective analysis. The response generated as a result of biochemical reaction is detected by a transducer to give a signal (optical/electrical/thermal) that can be used with or without amplification for the estimation of the concentration of an analyte in a given test sample. Among the various biosensors, electrochemical sensors, especially amperometric biosensors presently hold a leading position.Due to specificity, portability, simplicity, high sensitivity, potential ability for real-time and on-site analysis coupled with the speed and low cost, biosensors have been projected to have applications in food analysis, environment control, clinical detection, drug and agriculture industries etc. Besides this, biosensors offer exciting opportunities for numerous decentralized clinical applications, ranging from emergency room screening, home self testing and alternative site testing, continuous and real-time in vivo monitoring. New generation of biosensors combining new bioreceptors with the ever-growing number of transducers is emerging. The present paper highlights some of the recent advances in the area of biosensors contributed by our laboratory.

- by Sandeep Chaubey
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- Biomedical Engineering, Food Analysis, Molecular Recognition, Emergency Room

The purpose of this study was to (a) examine the concurrent validity of the Dynamic Indicators of Basic Early Literacy Skills (DIBELS) with the Com- prehensive Test of Phonological Processing (CTOPP), and (b) explore the diag- nostic accuracy of the DIBELS in predicting CTOPP performance using suggested and alternative cut-scores. Eighty-six students were administered the DIBELS and the CTOPP in

- by John Hintze
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- Phonology, Statistical Analysis, Prediction, School Psychology

A high-performance liquid chromatography (HPLC) procedure for the separation of choline lysophospholids including 1-acyl-lysophosphatidylcholines and 1-O-alkyl-lysophosphatidyl-cholines, like the lysoform of the platelet activating factor... more

- by Giovanni Camussi
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- Water, Fluorescence, Methanol, High Performance Liquid Chromatography
- by R. Cerbo and +2
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- Emergency Medical Services, Humans, Female, Male
- by Beata Walczak
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- Pattern Recognition, Mass Spectrometry, Support Vector Machines, Food Chemistry

A micro-gas analysis system, μGAS, is proposed here for the continuous and highly sensitive on-site measurement of atmospheric trace gases. The μGAS presented here is comprised of a microchannel scrubber and a high-sensitivity small fluorescence detector. The key to the μGAS is the fabrication of a good gas permeable membrane on a shallow channel to allow for the efficient accumulation of the analyte into the absorbing solution. The channel is formed by micromachining, and a gas permeable membrane of any desired thickness is formed by spin-coating on a fluorosilane-treated substrate. In this work, polydimethylsiloxane was used for both the channel block and the gas permeable membrane, and were easily tightly bonded. The microchannel structure ensures a high sensitivity, and the sensitivity is inversely proportional to the membrane thickness. The device, including the air supply function, is set in only 30-mm-cube. The performance of the μGAS has been demonstrated as a H2S gas sensor. The μGAS consumes only 1ml of the reagent solution in 8h of operation with a detection limit of 1ppbv.

- by Shin-Ichi Ohira
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- Analytical Chemistry, Gas Sensor, Microanalysis, Membrane

Abstract: - This paper describes a fully integrated acoustic sensor that combines high sensitivity, wide frequency range and low cost of batch processed miniaturized silicon components. A sputtered piezoelectric ZnO layer transforms the... more

- by Sherif Salah
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- Computer Science, Solar Cell, Gas Sensor, Band Gap
- by amien amien
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- Hepatology, Hepatitis C Virus, Clinical Sciences, High Sensitivity
- by Torsten Eken
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- Trauma, Emergency Medical Services, Humans, Triage

A simple and sensitive in situ method for monitoring the occurrence of toxic algal blooms and shellfish contamination events has been developed. The technique involves the passive adsorption of biotoxins onto porous synthetic resin filled sachets (SPATT bags) and their subsequent extraction and analysis. The success of the method is founded on the observation that during algal blooms significant amounts of toxin, including the low polarity lipophilic compounds such as the pectenotoxins and the okadaic acid complex toxins, are dissolved in the seawater. The results of field trials during Dinophysis acuminata and Protoceratium reticulatum blooms are presented. These data prove the concept and demonstrate that the technique provides a means of forecasting shellfish contamination events and predicting the net accumulation of polyether toxins by mussels. As an early warning method it has many advantages over current monitoring techniques such as shellfish-flesh testing and phytoplankton ...

- by Andy Selwood
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- Genetics, Water, Mass Spectrometry, Eutrophication
- by Alessio Papini and +1
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- Sensitivity Analysis, Multi objective optimization, Nitrogen, Enzyme
- by Elizabeth Thomas and +1
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- Life Sciences, Signal Transduction, Histamine, Smooth muscle
- by Coconut s
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- Gastroenterology, Humans, Female, Male

Current micro-calorimetry equipment requires large sample volumes. To overcome this limitations, a highly sensitive nano-calorimeter with reduced sample volume and decreased response time was developed (Winter, W. and Hohne, G.W.H., Thermochimica Acta, vol.403, p.43-53, 2003; Eframov, M. Yu et al., Thermochimica Acta, vol.412, p.13-23, 2004). Sensitivity is evinced by detection of phase transitions in liquid crystals, solutions of a phospholipid

- by Isabella Moser
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- IEEE, Flow measurement, Phase transition, Enzyme

Purpose (1) To determine the effect of solution pH before lyophilization, over the range of 1.5 to 10, on the salt and polymorphic forms of glycine crystallizing in frozen solutions and in lyophiles. (2) To quantify glycine crystallization during freezing and annealing as a function of solution pH before lyophilization. (3) To study the effect of phosphate buffer concentration on the extent of glycine crystallization before and after annealing. Materials and Methods Glycine solutions (10% w/v), with initial pH ranging from 1.5 to 10, were cooled to −50°C, and the crystallized glycine phases were identified using a laboratory X-ray source. Over the same pH range, glycine phases in lyophiles obtained from annealed solutions (0.25, 2 and 10% w/v glycine), were characterized by synchrotron X-ray diffractometry (SXRD). In the pH range of 3.0 to 5.9, the extent of glycine crystallization during annealing was monitored by SXRD. Additionally, the effect of phosphate buffer concentration (50 to 200 mM) on the extent of glycine crystallization during freezing, followed by annealing, was determined. Results In frozen solutions, β-glycine was detected when the initial solution pH was ≥ 4. In the lyophiles, in addition to β- and γ-glycine, glycine HCl, diglycine HCl, and sodium glycinate were also identified. In the pH range of 3.0 to 5.9, decreasing the pH reduced the extent of glycine crystallization in the frozen solution. When the initial pH was fixed at 7.4, and the buffer concentration was increased from 50 to 200 mM, the extent of glycine crystallization in frozen solutions decreased with an increase in buffer concentration. Conclusion Both solution pH and solute concentration before lyophilization influenced the salt and polymorphic forms of glycine crystallizing in frozen solutions and in lyophiles. The extent of glycine crystallization in frozen solutions was affected by the initial pH and buffer concentration of solutions. The high sensitivity of SXRD allowed simultaneous detection and quantification of multiple crystalline phases.

- by Larry Gatlin
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- Polymorphism, Pharmaceutical Technology, Crystallization, Pharmaceutical
- by A. Kalyuzhny
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- Immunology, Cytokines, Aluminum, Humans