Very High Sensitivity Heterodyne Detection of X-Band Radiation with Neon Indicator Lamps

Abstract Fisheries has a major contribution for the Indonesian economy both on a local and national scale. However, the phenomenon of climate change can threaten the sustainability of this sector. Therefore, a scientific approach is needed to determine the level of risk and adaptation strategies for fisheries, one of which is through vulnerability analysis. Vulnerability is the final analysis resulted from the analysis of sensitivity and exposure. Both of these analyses are important to determine the parameters that will affect the value of the fishery vulnerability to climate change. This research is focused on sensitivity and exposure analysis with the coverage limit is the province area to determine the sensitivity and exposure index that exists in the study area. The result will be important input in further research for the vulnerability of capture fisheries to climate change. Three provinces in Indonesia were selected through purposive sampling method. The source of data for indices variables were using recorded data in 2009-2020 from relevant sources. Result described that SST variability in the three provinces has the same pattern. In the exposure analysis, the SST is linked to the catch resulting in different exposure statuses in each province. It also illustrated those areas with a very high number of fishermen and catches will have very high sensitivity. The research will support in the sustainable management of capture fish at the province scale.

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Performance of Multibeam Very High Throughput Satellite Systems Based on FSO Feeder Links with HPA Nonlinearity

10.36227/techrxiv.12413384 ◽

2020 ◽

Author(s):

Emna Zedini ◽

Abla Kammoun ◽

Mohamed-Slim Alouini

Keyword(s):

Outage Probability ◽

High Throughput ◽

Direct Detection ◽

Satellite Communications ◽

Ergodic Capacity ◽

Heterodyne Detection ◽

High Signal ◽

Free Space Optical ◽

Asymptotic Results ◽

Very High

Due to recent advances in laser satellite communications technology, free-space optical (FSO) links are presented as an ideal alternative to the conventional radio frequency (RF) feeder links of the geostationary satellite for next generation very high throughput satellite (VHTS) systems. In this paper, we investigate the performance of multibeam VHTS systems that account for nonlinear high power amplifiers at the transparent fixed gain satellite transponder. Specifically, we consider the forward link of such systems, where the RF user link is assumed to follow the shadowed Rician model and the FSO feeder link is modeled by the Gamma-Gamma distribution in the presence of beam wander and pointing errors where it operates under either the intensity modulation with direct detection or the heterodyne detection. Moreover, zero-forcing precoder is employed to mitigate the effect of inter-beam interference caused by the aggressive frequency reuse in the user link. The performance of the system under study is evaluated in terms of the outage probability, the average bit-error rate (BER), and the ergodic capacity that are derived in exact closed-forms in terms of the bivariate Meijer's G function. Simple asymptotic results for the outage probability and the average BER are also obtained at high signal-to-noise ratio.

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The enhanced photoelectric properties of ZnO-doped WSe2 thin film

International Journal of Modern Physics B ◽

10.1142/s021797922150082x ◽

2021 ◽

pp. 2150082

Author(s):

Jingyi Zhu ◽

Xin Ding ◽

Xiaoyu Zhang ◽

Xiying Ma

Keyword(s):

Thin Films ◽

Light Absorption ◽

High Sensitivity ◽

Nucleation Density ◽

Light Power ◽

Thermal Evaporation Method ◽

Si Substrates ◽

Photoelectric Properties ◽

Very High ◽

Photoluminescence Efficiency

The photoelectric properties of ZnO-doped WSe2 thin films created on Si substrates by a thermal evaporation method were investigated. The effects of ZnO on the surface morphology, structure, photoluminescence, light absorption characteristics and electrical properties of WSe2 thin films were analyzed. It is found that the nucleation density and the crystallinity of the ZnO-doped WSe2 nanowires are higher than without doping, and the electron mobility of the doped sample is about 1.4 times that of the undoped sample. Also, doping improved the light absorption and photoluminescence efficiency. Additionally, the [Formula: see text]–[Formula: see text] curve of the ZnO-doped WSe2/Si heterojunction gradually changes from a rectification characteristic to a linear dependence, and the photocurrent increases by about four times when the light power increases from 0 to 25 mW/cm2. Moreover, the heterojunction has a very high sensitivity to operating temperature; the current significantly increases as the temperature increases to 300[Formula: see text]. With high absorptivity and photoluminescence efficiency, and sensitivity to light and temperature, ZnO-doped WSe2 film is promising for use in optoelectronic devices.

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Identification of macrotroponin T: findings from a case report and non-reproducible troponin T results

Clinical Chemistry and Laboratory Medicine (CCLM) ◽

10.1515/cclm-2021-0626 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Leo Lam ◽

Leah Ha ◽

Campbell Heron ◽

Weldon Chiu ◽

Campbell Kyle

Keyword(s):

Troponin T ◽

Protein A ◽

Cardiac Injury ◽

High Sensitivity ◽

High Molecular Weight Complex ◽

High Incidence ◽

Laboratory Results ◽

Clinical Consequences ◽

Very High ◽

Biochemical Features

Abstract Objectives Macrotroponin is due to cardiac troponin (cTn) binding to endogenous cTn autoantibodies. While previous studies showed a high incidence of macrotroponin affecting cTnI assays, reports of macrotroponin T, particularly without cTnI reactivity, have been rare. Although the clinical significance of macrotroponin is not fully understood, macroenzymes and complexes are recognised to cause confusion in interpretation of laboratory results. The potential for adverse clinical consequences due to misinterpretation of affected results is very high. Methods We describe four cases of macrotroponin T with persistently low high sensitivity cTnT (hs-cTnT) by the 9 min compared to the 18 min variant of the assay. Three cases were serendipitously identified due to the use of a lot number of Roche hs-cTnT affected by non-reproducible results, necessitating measurement of cTnT in duplicate. We identified and characterised these macrotroponin specimens by immunoglobulin depletion (Protein A and PEG precipitation), mixing studies with EDTA and recombinant cTnT. Results In cases of macro-cTnT, a lower result occurred on the hs-cTnT using the 9 min compared to 18 min variant assay (ratio of 9–18 min hs-cTnT <0.80). Mixing studies with recombinant cTnT or EDTA demonstrated a difference in recovery vs. controls. One of these patients demonstrated a high molecular weight complex for cTnI and cTnT demonstrating a macrocomplex involving both cTn. This patient demonstrated a rise and fall in cTn when measured by several commercial assays consistent with genuine acute cardiac injury. Conclusions We identified several cases of macro-cTnT and described associated clinical and biochemical features.

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T7 exo-mediated FRET-breaking combined with DSN–RNAse–TdT for the detection of microRNA with ultrahigh signal-amplification

The Analyst ◽

10.1039/c9an00303g ◽

2019 ◽

Vol 144 (10) ◽

pp. 3216-3220 ◽

Cited By ~ 5

Author(s):

Van Thang Nguyen ◽

Binh Huy Le ◽

Young Jun Seo

Keyword(s):

False Positive ◽

Signal Amplification ◽

High Sensitivity ◽

Positive Signal ◽

False Positive Signal ◽

Breaking Mechanism ◽

Very High

A DSN–RNAse–TdT–T7 exo probing system allows the detection of miRNA 21 with very high sensitivity (LOD = 2.57 fM) and selectivity—the result of (i) avoiding the false-positive signal from miRNA reacting with TdT polymerase and (ii) signal amplification occurring through a FRET-breaking mechanism involving T7 exo.

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High Velocity Gas in the Halos of Spiral Galaxies

Symposium - International Astronomical Union ◽

10.1017/s0074180900197293 ◽

2004 ◽

Vol 217 ◽

pp. 136-141 ◽

Cited By ~ 3

Author(s):

Filippo Fraternali ◽

Tom Oosterloo ◽

Rense Boomsma ◽

Rob Swaters ◽

Renzo Sancisi

Keyword(s):

High Velocity ◽

Spiral Galaxies ◽

High Sensitivity ◽

Neutral Gas ◽

Ngc 6946 ◽

Inclination Angles ◽

High Velocity Clouds ◽

Halo Gas ◽

Very High ◽

Thick Layers

Recent, high sensitivity, HI observations of nearby spiral galaxies show that their thin ‘cold’ disks are surrounded by thick layers (halos) of neutral gas with anomalous kinematics. We present results for three galaxies viewed at different inclination angles: NGC 891 (edge-on), NGC 2403 (i=60°), and NGC 6946 (almost face-on). These studies show the presence of halo gas up to distances of 10-15 kpc from the plane. Such gas has a mean rotation 25-50 km s−1 lower than that of the gas in the plane, and some complexes are detected at very high velocities, up to 200-300 km s−1. The nature and origin of this halo gas are poorly understood. It can either be the result of a galactic fountain or of accretion from the intergalactic medium. It is probably analogous to some of the High Velocity Clouds (HVCs) of the Milky Way.

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