In order to improve the performance of ceramic composite armor it is essential to know the mechanisms during each phase of the projectile–target interaction and their influence on the penetration resistance.Since the...In order to improve the performance of ceramic composite armor it is essential to know the mechanisms during each phase of the projectile–target interaction and their influence on the penetration resistance.Since the view on the crater zone and the tip of a projectile penetrating a ceramic is rapidly getting obscured by damaged material,a flash X-ray technique has to be applied in order to visualize projectile penetration.For this purpose,usually several flash X-ray tubes are arranged around the target and the radiographs are recorded on film.At EMI a flash X-ray imaging method has been developed,which provides up to eight flash radiographs in one experiment.A multi-anode 450 k V flash X-ray tube is utilized with this method.The radiation transmitted through the target is then detected on a fluorescent screen.The fluorescent screen converts the radiograph into an image in the visible wavelength range,which is photographed by means of a high-speed camera.This technique has been applied to visualize and analyze the penetration of 7.62 mm AP projectiles into three different types of Si C ceramics.Two commercial Si C grades and MICASIC(Metal Infiltrated Carbon derived Si C),a C-Si Si C ceramic developed by DLR,have been studied.The influences,not only of the ceramic but also the backing material,on dwell time and projectile erosion have been studied.Penetration curves have been determined and their relevance to the ballistic resistance is discussed.展开更多
In film production cinematography is a visual medium that connects the film experience to the viewers.Just like other crew members such as directors and actors,specific names of cinematographers become common in the A...In film production cinematography is a visual medium that connects the film experience to the viewers.Just like other crew members such as directors and actors,specific names of cinematographers become common in the African film industry.Abebe Ketsela,who has a career spanning many decades and popular designations,is regarded as one of the best intellect cinematographers in Ethiopian cinema.This qualitative content analysis examines his works his cinematography skill emerged from his ability to utilize shot selection,framing,and composition.This qualitative content analysis of Aster film focuses on the Cinematography concept of camera mobility,and lighting techniques to tell the story naturally so.This is the revised transcription of an interview with Abebe Ketsela that took place on September 27th 2021 at the Department of Film Production Studio at Ale-School of Fine Arts and Design,Adds Ababa University,St.marry Avenue,Addis Ababa,Ethiopia,the place where African filmmakers teach film directing,Cinematography,and screenplay writing.The film production Department is the first Film School which is opened in 2015.This place in this site is a vigorous Black African center as film making education school at the level of second Degree and the excremental area of his creative works.The interview spanned three and a half hours and roofed an extensive range of topics,most of which pivoted around:A glimpse on Ethiopian film through a cinematographer of Aster:how his visual creation reveals in his cinematography.展开更多
基金financial support of the study by the Bundeswehr Research Institute for Materials, Fuels and Lubricants (WIWe B) (grant number E/E210/AB015/9F120)
文摘In order to improve the performance of ceramic composite armor it is essential to know the mechanisms during each phase of the projectile–target interaction and their influence on the penetration resistance.Since the view on the crater zone and the tip of a projectile penetrating a ceramic is rapidly getting obscured by damaged material,a flash X-ray technique has to be applied in order to visualize projectile penetration.For this purpose,usually several flash X-ray tubes are arranged around the target and the radiographs are recorded on film.At EMI a flash X-ray imaging method has been developed,which provides up to eight flash radiographs in one experiment.A multi-anode 450 k V flash X-ray tube is utilized with this method.The radiation transmitted through the target is then detected on a fluorescent screen.The fluorescent screen converts the radiograph into an image in the visible wavelength range,which is photographed by means of a high-speed camera.This technique has been applied to visualize and analyze the penetration of 7.62 mm AP projectiles into three different types of Si C ceramics.Two commercial Si C grades and MICASIC(Metal Infiltrated Carbon derived Si C),a C-Si Si C ceramic developed by DLR,have been studied.The influences,not only of the ceramic but also the backing material,on dwell time and projectile erosion have been studied.Penetration curves have been determined and their relevance to the ballistic resistance is discussed.
文摘In film production cinematography is a visual medium that connects the film experience to the viewers.Just like other crew members such as directors and actors,specific names of cinematographers become common in the African film industry.Abebe Ketsela,who has a career spanning many decades and popular designations,is regarded as one of the best intellect cinematographers in Ethiopian cinema.This qualitative content analysis examines his works his cinematography skill emerged from his ability to utilize shot selection,framing,and composition.This qualitative content analysis of Aster film focuses on the Cinematography concept of camera mobility,and lighting techniques to tell the story naturally so.This is the revised transcription of an interview with Abebe Ketsela that took place on September 27th 2021 at the Department of Film Production Studio at Ale-School of Fine Arts and Design,Adds Ababa University,St.marry Avenue,Addis Ababa,Ethiopia,the place where African filmmakers teach film directing,Cinematography,and screenplay writing.The film production Department is the first Film School which is opened in 2015.This place in this site is a vigorous Black African center as film making education school at the level of second Degree and the excremental area of his creative works.The interview spanned three and a half hours and roofed an extensive range of topics,most of which pivoted around:A glimpse on Ethiopian film through a cinematographer of Aster:how his visual creation reveals in his cinematography.
