scholarly journals Influence of Space Charge on the Relative Sensitivity Coefficient of a Triode Gauge

2017 ◽  
Vol 60 (12) ◽  
pp. 490-494
Author(s):  
Shigemi SUGINUMA ◽  
Masahiro HIRATA ◽  
Tokihiko KOBATA
Keyword(s):  
Space Charge ◽  
Relative Sensitivity ◽  
Sensitivity Coefficient

scholarly journals Manifestation of propagation traits for polymer square lattice micro-structured optical fiber in THz regime: a simplified model

2021 ◽  
Author(s):  
Hukam Singh ◽  
Dinesh Kumar Sharma ◽  
Saurabh Mani Tripathi
Keyword(s):  
Optical Fiber ◽  
Numerical Aperture ◽  
Relative Sensitivity ◽  
Sensitivity Coefficient ◽  
Spot Size ◽  
Square Lattice ◽  
Confinement Loss ◽  
Design Parameters ◽  
Solid Core ◽  
Material Loss

Abstract To sustain the pace with immense prominence, interest in low-loss terahertz (THz) waveguides increases due to their particular applications in the multidisciplinary arena. This paper narrates a novel solid-core polymer-based square lattice micro-structured optical fiber (SL-MOF) with circular air-holes for efficient propagation of THz waves. The anticipated model’s guiding attributes are described by employing the numerically efficient finite-element method (FEM) in conjunction with an auxiliary Ring Model. Numerical analysis of the model exhibits confinement loss of about ~ 10 -7 dB/cm and low effective material loss of ~ 0.19 cm -1 at the applied frequency of 1.0 THz. It is also demonstrated that the considered geometry furnishes low bending loss over the extended range of THz frequency. The relative sensitivity coefficient is evaluated in context for the targeted design parameters to enable the said model’s practical utility. Other nameworthy propagation characteristics, such as effective mode-index, power fraction, effective mode-area, numerical aperture, spot-size, and the beam divergence are also investigated. The improved outcomes are anticipated that the proposed configuration will be opened a new epoch in the THz waveband.

scholarly journals National assessment of throughfall sensitivity to changes in storm magnitude for the forests of Iran

2018 ◽  
Vol 27 (3) ◽  
pp. e019 ◽  
Author(s):  
Pedram Attarod ◽  
Qiuhong Tang ◽  
John Van Stan II ◽  
Xingcai Liu
Keyword(s):  
Tree Species ◽  
Coupled Model ◽  
Relative Sensitivity ◽  
Sensitivity Coefficient ◽  
Linear Relationships ◽  
Forest Sites ◽  
High Emission ◽  
Precipitation Projection ◽  
Intercomparison Project ◽  
Storm Frequency

Aim of study: To understand throughfall (TF) sensitivity to variability in rainfall amount (Pg) for typical forest sites across the main climate types of Iran.Area of study: Nine forest stands of several common native and introduced tree species situated in all common Iranian climate types, but located primarily in northern Iran.Material and methods: A nondimensional relative sensitivity coefficient was employed to predict responses of TF to Pg changes. Projected Pg changes over the measurement sites for the period 2020-50 were estimated using one of the Coupled Model Intercomparison Project phase 5 (CMIP5) known as HadGEM2-ES under low and high emission scenarios (RCP 2.6 and 8.5).Main results: TF displayed strong positive linear relationships with Pg at all sites [TF=0.66 Pg -0.16; R2=0.91]. The sensitivity coefficient ranged from 0.96-2.35 across the nine forest sites and large sensitivity coefficientdifferences were found between small (< mean annual Pg) and large (> mean annual Pg) storms for arid and Mediterranean plantations. Shifts in Pg and increased small storm frequency are predicted for these regions (2020-50) under low and high emission scenarios.Research highlights: TF sensitivity may be a useful variable when selecting tree species for afforestation to buffer expected shifts in Pg due to climate change.Keywords: climate change; forest ecosystems; precipitation projection; throughfall sensitivity.

scholarly journals Simulation of Relative Sensitivity Coefficient of Bayard-Alpert Gauge

2016 ◽  
Vol 59 (6) ◽  
pp. 156-159 ◽  
Author(s):  
Shigemi SUGINUMA ◽  
Masahiro HIRATA ◽  
Tokihiko KOBATA
Keyword(s):  
Relative Sensitivity ◽  
Sensitivity Coefficient

Hollow-Core Photonic Crystal Fiber Based on C2H2 and NH3 Gas Sensor

2013 ◽  
Vol 411-414 ◽  
pp. 1577-1580
Author(s):  
Bao Qun Wu ◽  
Ying Lu ◽  
Cong Jing Hao ◽  
Liang Cheng Duan ◽  
Nan Nan Luan ◽  
...  
Keyword(s):  
Refractive Index ◽  
Photonic Crystal ◽  
Gas Sensor ◽  
Photonic Crystal Fiber ◽  
Gas Sensing ◽  
Relative Sensitivity ◽  
Sensitivity Coefficient ◽  
Hollow Core ◽  
Crystal Fiber ◽  
Mode Field

In this paper, we propose a new hollow-core photonic crystal fiber, which can be available for gas sensor. In addition, properties of the fiber are analyzed at the wavelength of C2H2and NH3absorption peak 1530nm and 1967nm, respectively. For both wavelengths, relative sensitivity coefficients are higher than 0.95, which makes sense in gas sensing. We also get relationship between relative sensitivity coefficient and radius of fiber core, as well as effective refractive index of the mode field.

scholarly journals HOW WILL CLIMATE CHANGE IMPACT THE STORM MAGNITUDE AND THROUFALL IN SEVERAL FOREST AREAS IN IRAN?

2019 ◽  
Vol XLII-4/W18 ◽  
pp. 117-125
Author(s):  
P. Attarod ◽  
Q. Tang ◽  
J. T. Van Stan II ◽  
T. G. Pypker ◽  
X. Liu
Keyword(s):  
Climate Change ◽  
Coupled Model ◽  
Relative Sensitivity ◽  
Sensitivity Coefficient ◽  
Emission Scenarios ◽  
Forest Sites ◽  
Primary Driver ◽  
High Emission ◽  
Intercomparison Project ◽  
Storm Frequency

Abstract. Across all forest systems, the primary driver of throughfall (TF) amount is rainfall amount (Pg) though no work has addressed the sensitivity of the TF response to projected shifts in Pg due to climate change. We assessed how climate change may impact TF sensitivity to variability in Pg for eleven typical forest sites across the main climate types of Iran using a nondimensional relative sensitivity coefficient. The Coupled Model Intercomparison Project phase 5 (CMIP5) HadGEM2-ES product was used under two emission scenarios (Representative Concentration Pathway (RCP) 2.6 and 8.5) to project yearly precipitation and Pg for the measurement sites during 2020–50. There was a strong linear relationship between TF and Pg at all sites [TF = 0.66 (Pg) – 0.30; R2 = 0.91; n = 639]. The sensitivity coefficient ranged from 0.96–5.3 across the eleven forest sites. Large sensitivity coefficient differences were found between small (< mean annual Pg) and large (> mean annual Pg) storms for arid plantations. To buffer expected shifts in storm size due to climate change, it may be suitable to incorporate TF sensitivity when choosing landscaping and urban greening. Shifts in Pg and increased small storm frequency are predicted for 2020–50 per CMIP5 HadGEM2-ES low and high emission scenarios.

Electron holography of interfaces in electroceramics

1993 ◽  
Vol 51 ◽  
pp. 1088-1089
Author(s):  
Vinayak P. Dravid ◽  
V. Ravikumar ◽  
Richard Plass
Keyword(s):  
Space Charge ◽  
Direct Evidence ◽  
Materials Science ◽  
Theoretical Work ◽  
Electron Holography ◽  
Resolution Limit ◽  
Interference Phenomenon ◽  
X Ray ◽  
Electron Sources ◽  
Science Community

With the advent of coherent electron sources with cold field emission guns (cFEGs), it has become possible to utilize the coherent interference phenomenon and perform “practical” electron holography. Historically, holography was envisioned to extent the resolution limit by compensating coherent aberrations. Indeed such work has been done with reasonable success in a few laboratories around the world. However, it is the ability of electron holography to map electrical and magnetic fields which has caught considerable attention of materials science community.There has been considerable theoretical work on formation of space charge on surfaces and internal interfaces. In particular, formation and nature of space charge have important implications for the performance of numerous electroceramics which derive their useful properties from electrically active grain boundaries. Bonnell and coworkers, in their elegant STM experiments provided the direct evidence for GB space charge and its sign, while Chiang et al. used the indirect but powerful technique of x-ray microchemical profiling across GBs to infer the nature of space charge.

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