Error comparison and analysis of six-light-screen vertical target under different light-screen-array model

2018 ◽  
Author(s):  
Rui Chen ◽  
Jinping Ni ◽  
Ding Chen
Keyword(s):  
Comparison And Analysis

The Effects of the sphragis on male and female genitalia in Acraea (Nymphalidae) butterflies

2020 ◽  
Vol 22 ◽  
Author(s):  
Shannon L Summers ◽  
Akito Y Kawahara ◽  
Ana P. S. Carvalho
Keyword(s):  
Interspecific Variation ◽  
Sperm Storage ◽  
Male Mating ◽  
Museum Collections ◽  
Storage Organ ◽  
Mating Plug ◽  
Males And Females ◽  
Comparison And Analysis ◽  
Imagej Software ◽  
Sexually Antagonistic Coevolution

Male mating plugs have been used in many species to prevent female re-mating and sperm competition. One of the most extreme examples of a mating plug is the sphragis, which is a large, complex and externalized plug found only in butterflies. This structure is found in many species in the genus Acraea (Nymphalidae) and provides an opportunity for investigation of the effects of the sphragis on the morphology of the genitalia, which is poorly understood. This study aims to understand morphological interspecific variation in the genitalia of Acraea butterflies. Using specimens from museum collections, abdomen dissections were conducted on 19 species of Acraea: 9 sphragis bearing and 10 non-sphragis bearing species. Genitalia imaging was performed for easier comparison and analysis and measurements of genitalia structures was done using ImageJ software. Some distinguishing morphological features in the females were found. The most obvious difference is the larger and more externalized copulatory opening in sphragis bearing species, with varying degrees of external projections. Females of the sphragis bearing species also tend to have a shorter ductus (the structure that connects the copulatory opening with the sperm storage organ) than those without the sphragis. These differences may be due to a sexually antagonistic coevolution between the males and females, where the females evolve larger and more difficult to plug copulatory openings and the males attempt to prevent re-mating with the sphragis.

Comparison and Analysis of Algorithms Used for Detecting Slums in Satellite Images

2019 ◽  
Author(s):  
Pallavi Saindane ◽  
Gayatri Ganapathy ◽  
Neha Prabhavalkar ◽  
Nilesh Bhatia ◽  
Aishwarya Vaidya
Keyword(s):  
Satellite Images ◽  
Analysis Of Algorithms ◽  
Comparison And Analysis

Comparison and analysis of the fda approved orphane drugs registerand the vital and essential drugs list of the Russian Federation

2020 ◽  
pp. 4-16
Author(s):  
D.S. Yurochkin ◽  
◽  
A.A. Leshkevich ◽  
Z.M. Golant ◽  
I.A. NarkevichSaint ◽  
...  
Keyword(s):  
United States ◽  
Russian Federation ◽  
Rare Diseases ◽  
Orphan Drugs ◽  
The United States ◽  
Orphan Diseases ◽  
Essential Drugs ◽  
The Russian Federation ◽  
Comparison And Analysis ◽  
The Government

The article presents the results of a comparison of the Orphan Drugs Register approved for use in the United States and the 2020 Vital and Essential Drugs List approved on October 12, 2019 by Order of the Government of the Russian Federation No. 2406-r. The comparison identified 305 international non-proprietary names relating to the main and/or auxiliary therapy for rare diseases. The analysis of the market of drugs included in the Vital and Essential Drugs List, which can be used to treat rare (orphan) diseases in Russia was conducted.

scholarly journals Virtual straightening of scraper conveyor based on the position and attitude solution of industrial robot model

2021 ◽  
Author(s):  
Suhua Li ◽  
Jiacheng Xie ◽  
Fang Ren ◽  
Xin Zhang ◽  
Xuewen Wang ◽  
...  
Keyword(s):  
Coal Seam ◽  
Industrial Robot ◽  
Steering Committee ◽  
High Accuracy ◽  
Simulation System ◽  
Direct Proportion ◽  
Hydraulic Support ◽  
Actual Distance ◽  
Scraper Conveyor ◽  
Comparison And Analysis

AbstractThe movement of the floating connecting mechanism between a hydraulic support and scraper conveyor is space movement; thus, when the hydraulic support pushes the scraper conveyor, there is an error between the actual distance of the scraper conveyor and the theoretical moving distance. As a result, the scraper conveyor cannot obtain the straightness requirement. Therefore, the movement law of the floating connecting mechanism between the hydraulic support and scraper conveyor is analyzed and programmed into the Unity3D to realize accurate pushing of the scraper conveyor via hydraulic support. The Coal Seam + Equipment Joint Virtual Straightening System is established, and a straightening method based on the motion law of a floating connection is proposed as the default method of the system. In addition, a straightening simulation of the scraper conveyor was performed on a complex coal seam floor, the results demonstrate that the average straightening error of the scraper conveyor is within 2–8 mm, and is in direct proportion to the fluctuation of the coal seam floor in the strike of the seam with high accuracy, the straightness of scraper conveyor is more affected by the subsidence terrain during straightening than by the bulge terrain. And some conclusions are verified by experiment. Based on the verification of the relevant conclusions, a comparison and analysis of Longwall Automation Steering Committee (LASC) straightening technology and default straightening method in the simulation system shows that the straightness accuracy of LASC straightening technology under complex floor conditions is slightly less than that of the default straightening method in the proposed system.

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