Performance-enhanced solar-blind photodetector based on a CH3NH3PbI3/β-Ga2O3 hybrid structure

2019 ◽  
Vol 7 (45) ◽  
pp. 14205-14211 ◽  
Author(s):  
Linpeng Dong ◽  
Tiqiang Pang ◽  
Jiangang Yu ◽  
Yucheng Wang ◽  
Wenguo Zhu ◽  
...  
Keyword(s):  
Electromagnetic Radiation ◽  
Hybrid Structure ◽  
The Sun ◽  
Accuracy And Precision ◽  
Solar Blind ◽  
Excellent Accuracy

Solar-blind photodetectors have drawn great attention due to their excellent accuracy and precision ignoring the electromagnetic radiation interference from the sun.

Collaborative Study of Methods for the Analysis and Control of AG-Chlordane and Its Formulations

1973 ◽  
Vol 56 (3) ◽  
pp. 591-595
Author(s):  
Marshall A Malina
Keyword(s):  
Coefficient Of Variation ◽  
Chromatographic Method ◽  
Collaborative Study ◽  
Assay Method ◽  
Good Precision ◽  
Accuracy And Precision ◽  
Infrared Method ◽  
Gas Chromatographic Method ◽  
And Control ◽  
Excellent Accuracy

Abstract Four methods for the analysis of AG-chlordane and its formulations were submitted to a collaborative study. Fifteen laboratories, including 5 CIPAC laboratories, participated in this study. The infrared method for the analysis of the content of the 2 chlordane isomers was precise, with a coefficient of variation of 0.015. The gas chromatographic method for the analysis of the heptachlor content also yielded good precision with a standard deviation of 0.16. The infrared assay method for granular formulations exhibited excellent accuracy and precision, with a coefficient of variation of 0.067 and an error of only +0.25% relative. The gas chromatographic assay method for emulsifiable concentrates exhibited poor accuracy and precision and was found unacceptable. The first 3 methods have been adopted as official first action.

Computer-Controlled Instrument System for Sequential Clinical Chemical Testing. II. Evaluation of Instrumental Performance

1973 ◽  
Vol 19 (10) ◽  
pp. 1122-1127 ◽  
Author(s):  
E Clifford Toren ◽  
Stephen A Mohr ◽  
Michael G Busby ◽  
George S Cembrowski
Keyword(s):  
Individual Component ◽  
Human Intervention ◽  
Instrumental Performance ◽  
Accuracy And Precision ◽  
Clinical Chemical ◽  
Instrumental System ◽  
Computer Controlled ◽  
Chemical Testing ◽  
Automated Modes ◽  
Excellent Accuracy

Abstract The instrumental system described [Clin. Chem.19, 1114 (1973)] is evaluated in manual, partially automated, and totally automated modes to measure system and individual component performance. Excellent accuracy and precision were observed, hence the system is judged suitable for most analytical applications. Results are: wavelength accuracy and reproducibility in automated mode: ±0.004 nm and ±0.1 nm, respectively; photometric accuracy and precision: ca. 0.8% relative and ±0.007 A, respectively, in both the manual and automated modes; and ratemeter accuracy and precision: ±0.4% relative and ±0.873 (SD) mV/min (or mA/ min), respectively, for standard synthetic ramps and ±1.2% relative and ±2.2 (SD) mV/min, respectively, under actual laboratory conditions for rates in the range of 1 to 200 mV/min. Automated experiments are made without human intervention after the samples are loaded.

scholarly journals The HPLC Analysis of Aflatoxins in Raw Peanuts with Sep-pak® Cleanup

1984 ◽  
Vol 11 (1) ◽  
pp. 21-23 ◽  
Author(s):  
W. Jeffrey Hurst ◽  
Kevin P. Snyder ◽  
Robert A. Martin
Keyword(s):  
Hplc Analysis ◽  
Analysis Data ◽  
Hplc Method ◽  
Aqueous Acetone ◽  
Accuracy And Precision ◽  
Excellent Accuracy

Abstract An HPLC method for the determination of aflatoxins is described. The aflatoxins are extracted with aqueous acetone and interfering compounds precipitated with CuCO3. After defatting, the aflatoxins are extracted into CH2Cl2 for cleanup with silica Sep-pak® which eliminates other interfering compounds. The resulting extract is then treated with TFA to form the hemiacetal derivatives prior to final HPLC analysis. Data indicated that the method exhibits excellent accuracy and precision. In addition, it is time and solvent conservative.

scholarly journals Effect of solar activity on electromagnetic fields and seismicity of the Earth

2021 ◽  
Vol 929 (1) ◽  
pp. 012019
Author(s):  
N.T. Tarasov
Keyword(s):  
Solar Activity ◽  
Ionizing Radiation ◽  
Total Energy ◽  
Electromagnetic Radiation ◽  
Electromagnetic Fields ◽  
Geomagnetic Storms ◽  
The Sun ◽  
Strong Earthquakes ◽  
Probability Of Occurrence ◽  
The Earth

Abstract It is shown that bursts of intensity of ionizing electromagnetic radiation from the Sun, as well as geomagnetic storms, cause a statistically significant decrease in the total number of earthquakes on Earth. After bursts of ionizing radiation from the Sun, a statistically significant decrease in the total energy of earthquakes occurs, and after geomagnetic storms, its increase is observed. This is mainly due to an increase in the number of the strongest earthquakes with MS > 7 after geomagnetic storms and a decrease in the number of such earthquakes after bursts of ionizing electromagnetic radiation from the Sun. During geomagnetic storms and for several days after them, the probability of occurrence of strong earthquakes increases more than two times, and after bursts of ionizing electromagnetic radiation from the Sun, this probability decreases almost twice.

Validated UV-Visible spectrometry using water as a solvent for determination of chloroquine in tablet samples

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Linear Dependence ◽  
Dosage Forms ◽  
Distilled Water ◽  
Pharmaceutical Tablet ◽  
Accuracy And Precision ◽  
Tablet Formulations ◽  
Uv Visible ◽  
Tablet Dosage ◽  
Excellent Accuracy

Methods reported including the official methods for determination ofchloroquine in tablet samples use carcinogenic organic solvents. In this study,UV-Vis spectrometry using water as a solvent was developed for determination ofchloroquine phosphate in pharmaceutical tablet dosage forms. The method wasvalidated according to the International Conference on Harmonization (ICH) andUSP guidelines. The absorbance of chloroquine phosphate in distilled water at max of 343 nm showed linear dependence on concentration in the range 10.88-30.56μg mL-1 with determination coefficient of 0.99972. Recovery results in the range98.79–101.20% and low coefficient of variation values for intra-day and interdayprecisions (0.37% and 0.76%, respectively) showed the accuracy andreproducibility of the method. The method was used for determination ofchloroquine phosphate in tablet formulations of different brands. Results in therange 100.63–103.52% of the labeled chloroquine phosphate in tabletformulations confirmed the applicability of the developed method for real sampleanalysis. Hence, the developed UV-Vis method using environmentally friendlywater as a solvent, with an excellent accuracy and precision showed that thedeveloped method can be a potential substituent for the official referencemethods.

scholarly journals Miniaturized, light-adaptive, wireless dosimeters autonomously monitor exposure to electromagnetic radiation

2019 ◽  
Vol 5 (12) ◽  
pp. eaay2462
Author(s):  
Kyeongha Kwon ◽  
Seung Yun Heo ◽  
Injae Yoo ◽  
Anthony Banks ◽  
Michelle Chan ◽  
...  
Keyword(s):  
Electromagnetic Radiation ◽  
Field Studies ◽  
Skin Aging ◽  
The Sun ◽  
Power Circuit ◽  
Multiple Wavelengths ◽  
Mode Of Detection ◽  
Ultralow Power ◽  
Lighting Systems ◽  
Wireless Dosimeters

Exposure to electromagnetic radiation (EMR) from the sun and from artificial lighting systems represents a modifiable risk factor for a broad range of health conditions including skin cancer, skin aging, sleep and mood disorders, and retinal damage. Technologies for personalized EMR dosimetry could guide lifestyles toward behaviors that ensure healthy levels of exposure. Here, we report a millimeter-scale, ultralow-power digital dosimeter platform that provides continuous EMR dosimetry in an autonomous mode at one or multiple wavelengths simultaneously, with time-managed wireless, long-range communication to standard consumer devices. A single, small button cell battery supports a multiyear life span, enabled by the combined use of a light-powered, accumulation mode of detection and a light-adaptive, ultralow-power circuit design. Field studies demonstrate single- and multimodal dosimetry platforms of this type, with a focus on monitoring short-wavelength blue light from indoor lighting and display systems and ultraviolet/visible/infrared radiation from the sun.

scholarly journals Excitation Properties of Photopigments and Their Possible Dependence on the Host Star

2021 ◽  
Vol 921 (2) ◽  
pp. L41
Author(s):  
Manasvi Lingam ◽  
Amedeo Balbi ◽  
Swadesh M. Mahajan
Keyword(s):  
Electromagnetic Radiation ◽  
Mechanical Model ◽  
Photon Flux ◽  
Quantum Mechanical ◽  
The Sun ◽  
Late Type ◽  
M Dwarfs ◽  
The Earth ◽  
Simple Quantum ◽  
Stellar Temperature

Abstract Photosynthesis is a plausible pathway for the sustenance of a substantial biosphere on an exoplanet. In fact, it is also anticipated to create distinctive biosignatures detectable by next-generation telescopes. In this work, we explore the excitation features of photopigments that harvest electromagnetic radiation by constructing a simple quantum-mechanical model. Our analysis suggests that the primary Earth-based photopigments for photosynthesis may not function efficiently at wavelengths >1.1 μm. In the context of (hypothetical) extrasolar photopigments, we calculate the potential number of conjugated π-electrons (N ⋆) in the relevant molecules, which can participate in the absorption of photons. By hypothesizing that the absorption maxima of photopigments are close to the peak spectral photon flux of the host star, we utilize the model to estimate N ⋆. As per our formalism, N ⋆ is modulated by the stellar temperature, and is conceivably higher (lower) for planets orbiting stars cooler (hotter) than the Sun; exoplanets around late-type M-dwarfs might require an N ⋆ twice that of the Earth. We conclude the analysis with a brief exposition of how our model could be empirically tested by future observations.

Fast-response solar-blind ultraviolet photodetector with a graphene/β-Ga2O3/graphene hybrid structure

2017 ◽  
Vol 692 ◽  
pp. 634-638 ◽  
Author(s):  
Meilin Ai ◽  
Daoyou Guo ◽  
Yingyu Qu ◽  
Wei Cui ◽  
Zhenping Wu ◽  
...  
Keyword(s):  
Fast Response ◽  
Hybrid Structure ◽  
Ultraviolet Photodetector ◽  
Solar Blind

Chromospheric activity as a function of age in main-sequence stars

1966 ◽  
Vol 24 ◽  
pp. 40-43
Author(s):  
O. C. Wilson ◽  
A. Skumanich
Keyword(s):  
Main Sequence ◽  
The Sun ◽  
Main Sequence Stars ◽  
Tentative Conclusion ◽  
Chromospheric Activity ◽  
General Field ◽  
Large Clusters

Evidence previously presented by one of the authors (1) suggests strongly that chromospheric activity decreases with age in main sequence stars. This tentative conclusion rests principally upon a comparison of the members of large clusters (Hyades, Praesepe, Pleiades) with non-cluster objects in the general field, including the Sun. It is at least conceivable, however, that cluster and non-cluster stars might differ in some fundamental fashion which could influence the degree of chromospheric activity, and that the observed differences in chromospheric activity would then be attributable to the circumstances of stellar origin rather than to age.

Galactic orbits of stars

1966 ◽  
Vol 25 ◽  
pp. 93-97
Author(s):  
Richard Woolley
Keyword(s):  
Globular Cluster ◽  
Potential Field ◽  
High Velocity ◽  
Velocity Vector ◽  
Variable Stars ◽  
The Sun ◽  
Proper Motions ◽  
Rr Lyrae ◽  
The Galaxy

It is now possible to determine proper motions of high-velocity objects in such a way as to obtain with some accuracy the velocity vector relevant to the Sun. If a potential field of the Galaxy is assumed, one can compute an actual orbit. A determination of the velocity of the globular clusterωCentauri has recently been completed at Greenwich, and it is found that the orbit is strongly retrograde in the Galaxy. Similar calculations may be made, though with less certainty, in the case of RR Lyrae variable stars.

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