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MAUSAM ◽  
2021 ◽  
Vol 42 (2) ◽  
pp. 183-186
Author(s):  
S. B. S. S. SARMA

The coastal waters of Indian sub -continent do not have reliable measurements of fine structure of radio refractivity especially in near real-time basis needed to mitigate the effects of anomalous propagation for the defence communications as well as for antisubmarine warfare. This programme was designed to document the radio refractive layer structure and variations of the marine layer in tropical waters of India. The paper describes the above observations taken using the airborne microwave refractometer developed by the author at National Physical Laboratory, New Delhi. Typical observations taken (for the first time in India) under normal and anomalous propagation conditions are presented and the results are compared with the special shipborne observations made under MONEX operation over the coastal waters of India.


Sensors ◽  
2021 ◽  
Vol 21 (23) ◽  
pp. 8119
Author(s):  
Ondrej Pospisil ◽  
Petr Blazek ◽  
Karel Kuchar ◽  
Radek Fujdiak ◽  
Jiri Misurec

In recent years, the Industry 4.0 paradigm has accelerated the digitalization process of the industry, and it slowly diminishes the line between information technologies (IT) and operational technologies (OT). Among the advantages, this brings up the convergence issue between IT and OT, especially in the cybersecurity-related topics, including new attack vectors, threats, security imperfections, and much more. This cause raised new topics for methods focused on protecting the industrial infrastructure, including monitoring and detection systems, which should help overcome these new challenges. However, those methods require high quality and a large number of datasets with different conditions to adapt to the specific systems effectively. Unfortunately, revealing field factory setups and infrastructure would be costly and challenging due to the privacy and sensitivity causes. From the lack of data emerges the new topic of industrial testbeds, including sub-real physical laboratory environments, virtual factories, honeynets, honeypots, and other areas, which helps to deliver sufficient datasets for mentioned research and development. This paper summarizes related works in the area of industrial testbeds. Moreover, it describes best practices and lessons learned for assembling physical, simulated, virtual, and hybrid testbeds. Additionally, a comparison of the essential parameters of those testbeds is presented. Finally, the findings and provided information reveal research and development challenges, which must be surpassed.


2021 ◽  
Vol 2111 (1) ◽  
pp. 012041
Author(s):  
R Badarudin ◽  
D Hariyanto ◽  
M Ali ◽  
S Meunmany

Abstract This article describes the realization of testing the characteristics of a DC motor on Simulink as a virtual laboratory. Testing of DC motors based on real conditions in a physical laboratory by combining two DC machines coupled to shafts including DC motors and DC generators. The types of DC motors tested include separately excited DC motors, shunt DC motors, and series DC motors. The implementation of the Simulink model adopts the wiring diagram in the real test. The test procedure is also adopted on the real test procedure. The data from the test results are made in DC motor characteristics graph. Virtual laboratory using Simulink can be used to realize DC motor testing, including test procedures, running no-load DC motors, increasing the load of DC motors with infinitely simulation features on Simulink. The results of the study show the characteristics of the experimental data for all types of DC motors tested according to the theory.


Diagnostics ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1519
Author(s):  
Ivana P. Nedeljkovic ◽  
Vojislav Giga ◽  
Marina Ostojic ◽  
Ana Djordjevic-Dikic ◽  
Tamara Stojmenovic ◽  
...  

COVID-19 infection in athletes usually has a milder course, but in the case of complications, myocarditis and even sudden cardiac death may occur. We examined an athlete who felt symptoms upon returning to training after asymptomatic COVID-19 infection. Physical, laboratory, and echocardiography findings were normal. The cardiopulmonary exercise test was interrupted at submaximal effort due to severe dyspnea in the presence of reduced functional capacity in comparison to previous tests. Cardiac magnetic resonance (CMR) detected the focal myocarditis. After three months of recovery, CMR still revealed the presence of focal myocarditis and the persistence of decreased functional capacity. This case raises the question of screening athletes even after asymptomatic forms of COVID-19 infection.


2021 ◽  
Vol 12 ◽  
Author(s):  
Aline Waeber

This paper introduces frame-specific randomization devices to vary the situational context of an online lying experiment. Participants are asked to report outcomes of random draws from two different sources of uncertainty—decimals of the value of a stock index or a neutrally framed random number generator. The findings show that the frame-specific randomization device is not prone to the social norm effects documented in the literature. Because different environments can evoke different norms, I replicate the experiment in the more constrained setting of a traditional physical laboratory revealing no systematic differences in behavior. Furthermore, I am not able to show that participants who take longer to report are more honest and this is specific to the physical laboratory environment. Finally, the findings reveal gender differences in honesty depending on the environment—males are more honest when they participate in the laboratory as opposed to online.


2021 ◽  
Author(s):  
Jonathan P. Bowen

Did Alan Turing OBE FRS (23 June 1912 – 7 June 1954), the celebrated mathematician, codebreaker, and pioneer computer scientist, ever visit Oxford? He is well-known for his connections with the University of Cambridge, Bletchley Park, the National Physical Laboratory, and the University of Manchester, but there is no known written archival record of him ever visiting Oxford, despite it being the location of the University of Oxford, traditionally a rival of Cambridge. However, surely he must have done so.


Author(s):  
S. Cipriani ◽  
E. Maseroli ◽  
V. Di Stasi ◽  
I. Scavello ◽  
T. Todisco ◽  
...  

Abstract Purpose To explore the effects of 6-month systemic testosterone (T) administration on clitoral color Doppler ultrasound (CDU) parameters in women with female sexual dysfunction (FSD). Methods 81 women with FSD were retrospectively recruited. Data on CDU parameters at baseline and after 6 months with four different treatments were available and thus further longitudinally analyzed: local non-hormonal moisturizers (NH group), n = 37; transdermal 2% T gel 300 mcg/day (T group), n = 23; local estrogens (E group), n = 12; combined therapy (T + E group), n = 9. Patients underwent physical, laboratory, and genital CDU examinations at both visits and completed different validated questionnaires, including the Female Sexual Function Index (FSFI). Results At 6-month visit, T therapy significantly increased clitoral artery peak systolic velocity (PSV) when compared to both NH (p < 0.0001) and E (p < 0.0001) groups. A similar increase was found in the T + E group (p = 0.039 vs. E). In addition, T treatment was associated with significantly higher FSFI desire, pain, arousal, lubrication, orgasm, and total scores at 6-month visit vs. baseline. Similar findings were observed in the T + E group. No significant differences in the variations of total and high-density lipoprotein-cholesterol, triglycerides, fasting glycemia, insulin and glycated hemoglobin levels were found among the four groups. No adverse events were observed. Conclusion In women complaining for FSD, systemic T administration, either alone or combined with local estrogens, was associated with a positive effect on clitoral blood flow and a clinical improvement in sexual function, showing a good safety profile. Trial registration number NCT04336891; date of registration: April 7, 2020.


2021 ◽  
Vol 30 (1) ◽  
pp. 1-22
Author(s):  
Hugh Murphy

Cet article est le premier d’une série de trois sur les organismes de recherche en construction navale britannique et en fabrication de gros moteurs marins (diésel et à turbine). Dans cette première partie, qui traite de la période 1900-1945, l’auteur analyse les antécédents et la création ultérieure de deux associations de recherche propres à l’industrie, soit la British Shipbuilding Research Association et la Parsons Marine Turbine Research and Development Association, toutes deux créées en 1944. Il traite également de William Doxford & Sons, le premier fabricant britannique de moteurs diésel marins à faible vitesse établi sur la rivière Wear à Sunderland et, tangentiellement, du National Physical Laboratory, une institution financée par l’État, et sa division des navires.


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