Role of the host matrix on the thermal sensitivity of Er3+ luminescence in optical temperature sensors

2012 ◽  
Vol 174 ◽  
pp. 176-186 ◽  
Author(s):  
Sergio F. León-Luis ◽  
Ulises R. Rodríguez-Mendoza ◽  
Patricia Haro-González ◽  
Inocencio R. Martín ◽  
Víctor Lavín
Keyword(s):  
Thermal Sensitivity ◽  
Temperature Sensors ◽  
Host Matrix

Automatic Beach & Garden Umbrella with Rain Sensor

2021 ◽  
Vol 9 (VI) ◽  
pp. 1714-1722
Author(s):  
Md Subhan Alam
Keyword(s):  
Efficient Method ◽  
High Intensity ◽  
Power Transmission ◽  
Temperature Sensors ◽  
Summer Season ◽  
Project Report ◽  
Is Management ◽  
Human Effort ◽  
Cost Efficient

The aim of this project report is to form a sensible umbrella which may cut back human effort to its practicality and may target the market to its distinctive style, is basically vital in trendy society in danger of rain and wind while not coverage the aim of this project is to form such associate umbrella that's extremely sensitive within the incidences of rain and daylight at domestic and market level. Specifically, in summer season the ground of open areas gets thus heat to sun lightweight that produces problem for operating. This umbrella covers the whole hall throughout the rain and daylight. This umbrella operates with the assistance of various sensors like temperature sensors, water sensors and wind sensors. The gap and shutting of umbrella is being controlled through a motor. Motor will provides a fast and instant response to the shaft so shaft will play a significant role of power transmission for gap and shutting of umbrella. Motor provides needed rate to the shaft. Whenever temperature of the atmosphere goes on top of 28°, temperature device sends signal to Arduino that is management unit box. Then Arduino sends signal more to the motor so motor might activate and deliver needed rate to the coupling shaft. This project could be a cost-efficient method of providing machine-controlled controlled shade from high intensity daylight and rain. So, the issues of open and large areas is solved by mistreatment such kinds of machine-controlled umbrellas.

scholarly journals Role of carbon allocation efficiency in the temperature dependence of autotroph growth rates

2018 ◽  
Vol 115 (31) ◽  
pp. E7361-E7368 ◽  
Author(s):  
Bernardo García-Carreras ◽  
Sofía Sal ◽  
Daniel Padfield ◽  
Dimitrios-Georgios Kontopoulos ◽  
Elvire Bestion ◽  
...  
Keyword(s):  
Growth Rate ◽  
Temperature Dependence ◽  
Growth Rates ◽  
Carbon Allocation ◽  
Thermal Sensitivity ◽  
Potential Growth ◽  
Allocation Efficiency ◽  
Population Growth Rates ◽  
Performance Curves

Relating the temperature dependence of photosynthetic biomass production to underlying metabolic rates in autotrophs is crucial for predicting the effects of climatic temperature fluctuations on the carbon balance of ecosystems. We present a mathematical model that links thermal performance curves (TPCs) of photosynthesis, respiration, and carbon allocation efficiency to the exponential growth rate of a population of photosynthetic autotroph cells. Using experiments with the green alga, Chlorella vulgaris, we apply the model to show that the temperature dependence of carbon allocation efficiency is key to understanding responses of growth rates to warming at both ecological and longer-term evolutionary timescales. Finally, we assemble a dataset of multiple terrestrial and aquatic autotroph species to show that the effects of temperature-dependent carbon allocation efficiency on potential growth rate TPCs are expected to be consistent across taxa. In particular, both the thermal sensitivity and the optimal temperature of growth rates are expected to change significantly due to temperature dependence of carbon allocation efficiency alone. Our study provides a foundation for understanding how the temperature dependence of carbon allocation determines how population growth rates respond to temperature.

Role of charge transfer state and host matrix in Eu3+-doped alkali and earth alkali fluoro-aluminoborate glasses

2012 ◽  
Vol 34 (8) ◽  
pp. 1477-1481 ◽  
Author(s):  
N.T. Thanh ◽  
V.X. Quang ◽  
V.P. Tuyen ◽  
N.V. Tam ◽  
T. Hayakawa ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Charge Transfer State ◽  
Host Matrix ◽  
Transfer State

scholarly journals Absorption and Photoluminescence Study of Cds Quantum Dots: The Role of Host Matrix and Nanocrystal Size and Density

1999 ◽  
Vol 571 ◽  
Author(s):  
Yu.P. Rakovich ◽  
A.G. Rolo ◽  
M.V. Stepikhova ◽  
M.I. Vasilevskiy ◽  
M.J.M. Gomes ◽  
...  
Keyword(s):  
Volume Fraction ◽  
Optical Transition ◽  
Spectral Position ◽  
Host Matrix ◽  
The Matrix ◽  
Mean Size ◽  
Free Films ◽  
Matrix Free ◽  
Cds Crystallites

ABSTRACTIn this paper we present results of the absorption and photoluminescence (PL) of CdSdoped Si02 films fabricated by RF co-sputtering (semiconductor volume fraction f=1–15%, nano-crystallite's mean size 5–7nm) and matrix-free films of close-packed CdS nanocrystallites (f∼30%, size 2–5nm) produced by an original chemical method. The absorption spectra have been modelled using the modified Maxwell-Garnett model. This gives the e-h pair state energies and evidence of a strong absorption in the glass matrix containing CdS. The temperature dependence of the spectral position and broadening of the PL peak is analysed. It is concluded that a photo-generated hole is captured on an acceptor-type trap before the radiative recombination with a confined electron. The excitation of this ‘band-edge’ PL occurs through some states in the matrix and directly in the CdS crystallites for the two kinds of samples, respectively. The temperature coefficients of the optical transition energies for the nearly matrix-free films are similar to those of bulk CdS, while for the CdS/glass films they are smaller. This may be because of the different boundary conditions for the thermal expansion of CdS crystallites.

scholarly journals Recent Advances on Nanocomposite Resists With Design Functionality for Lithographic Microfabrication

2021 ◽  
Vol 8 ◽  
Author(s):  
E. D. Martínez ◽  
A. Prado ◽  
M. Gonzalez ◽  
S. Anguiano ◽  
L. Tosi ◽  
...  
Keyword(s):  
Functional Materials ◽  
Host Matrix ◽  
Size Dependent ◽  
Current Trends ◽  
Functional Composites ◽  
The Matrix ◽  
Carbon Based Nanomaterials ◽  
Novel Devices ◽  
Near Future

Nanocomposites formed by a phase-dispersed nanomaterial and a polymeric host matrix are highly attractive for nano- and micro-fabrication. The combination of nanoscale and bulk materials aims at achieving an effective interplay between extensive and intensive physical properties. Nanofillers display size-dependent effects, paving the way for the design of tunable functional composites. The matrix, on the other hand, can facilitate or even enhance the applicability of nanomaterials by allowing their easy processing for device manufacturing. In this article, we review the field of polymer-based nanocomposites acting as resist materials, i.e. being patternable through radiation-based lithographic methods. A comprehensive explanation of the synthesis of nanofillers, their functionalization and the physicochemical concepts behind the formulation of nanocomposites resists will be given. We will consider nanocomposites containing different types of fillers, such as metallic, magnetic, ceramic, luminescent and carbon-based nanomaterials. We will outline the role of nanofillers in modifying various properties of the polymer matrix, such as the mechanical strength, the refractive index and their performance during lithography. Also, we will discuss the lithographic techniques employed for transferring 2D patterns and 3D shapes with high spatial resolution. The capabilities of nanocomposites to act as structural and functional materials in novel devices and selected applications in photonics, electronics, magnetism and bioscience will be presented. Finally, we will conclude with a discussion of the current trends in this field and perspectives for its development in the near future.

scholarly journals Ion transporter gene expression is linked to the thermal sensitivity of calcification in the reef coral Stylophora pistillata

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
C. Bernardet ◽  
E. Tambutté ◽  
N. Techer ◽  
S. Tambutté ◽  
A. A. Venn
Keyword(s):  
Gene Expression ◽  
Dissolved Inorganic Carbon ◽  
Thermal Sensitivity ◽  
Expression Patterns ◽  
Transport Processes ◽  
Gene Expression Response ◽  
Stylophora Pistillata ◽  
Coral Calcification ◽  
Spread Model

AbstractCoral calcification underpins biodiverse reef ecosystems, but the physiology underlying the thermal sensitivity of corals to changing seawater temperatures remains unclear. Furthermore, light is also a key factor in modulating calcification rates, but a mechanistic understanding of how light interacts with temperature to affect coral calcification is lacking. Here, we characterized the thermal performance curve (TPC) of calcification of the wide-spread, model coral species Stylophora pistillata, and used gene expression analysis to investigate the role of ion transport mechanisms in thermally-driven declines in day and nighttime calcification. Focusing on genes linked to transport of dissolved inorganic carbon (DIC), calcium and H+, our study reveals a high degree of coherence between physiological responses (e.g. calcification and respiration) with distinct gene expression patterns to the different temperatures in day and night conditions. At low temperatures, calcification and gene expression linked to DIC transport processes were downregulated, but showed little response to light. By contrast, at elevated temperature, light had a positive effect on calcification and stimulated a more functionally diverse gene expression response of ion transporters. Overall, our findings highlight the role of mechanisms linked to DIC, calcium and H+ transport in the thermal sensitivity of coral calcification and how this sensitivity is influenced by light.

Metal-Containing Diamond-Like Nanocomposite Thin Film for Advanced Temperature Sensors

2005 ◽  
Vol 475-479 ◽  
pp. 2079-2082 ◽  
Author(s):  
T. Takeno ◽  
Toshiyuki Takagi ◽  
Aleksandra A. Bozhko ◽  
M. Shupegin ◽  
T. Sato
Keyword(s):  
Temperature Sensors ◽  
Nanocomposite Films ◽  
Metal Nanoclusters ◽  
Satisfactory Explanation ◽  
Silicon Phase ◽  
Carbon Phase ◽  
Host Matrix ◽  
Silicon Matrix ◽  
Wide Range ◽  
Inelastic Tunneling

The conductivity of metal-carbon-silicon nanocomposite films considered as potential candidates for the application as wide-range temperature sensors for severe environmental conditions is studied. The films combine unique properties of amorphous carbons with a new functionality imparted by the presence of metal nanoclusters in host matrix. The deposition of carbon-silicon phase was performed using PECVD of siloxane vapors. Metals (W, Nb, and Cr) with concentration in the range from 12 to 40 at. % were incorporated in the carbon-silicon host matrix by DC magnetron co-sputtering. The conductivity of the films decreases with temperature in the range 80-400 K, being well described by the power-law dependence. The conductivity mechanism found satisfactory explanation in the framework of the model of inelastic tunneling of electrons between metal nanoclusters dispersed in carbon-silicon matrix. The parallel study of the influence of metal concentration increase on carbon phase microstructure was carried out using Raman spectroscopy.

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