![]() ![]() Cook: Depth-sensing indentation at macroscopic dimensions. Pascucci: Indentation fracture of polycrystalline cubic materials. Cook: Cone crack nucleation at sharp contacts. Liniger: Kinetics of indentation cracking in glass. Pharr: Direct observation of indentation cracking in glass and ceramics. Fairbanks: Kinetics of shear-activated indentation crack initiation in soda-lime glass. Lawn: Residual stress effects in sharp-contact cracking: I. Conradt: Composition dependence of indentation deformation and indentation cracking in glass. Matsuoka: Effect of densification on crack initiation under Vickers indentation test. Rouxel: Quantitative evaluation of indentation-induced densification in glass. Yoffe: Elastic stress fields causes by indenting brittle materials. Evans: The response of solids to elastic/plastic indentation I. Ito: A new low-brittleness glass in the soda-lime-silica glass family. Swain: Indentation deformation/fracture of normal and anomalous glasses. Fujita: Crack resistance of glass on Vickers indentation. Marshall: Hardness, toughness and brittleness: An indentation analysis. Arzt: Contact area determination in indentation testing of elastomers. Chaudhri: Indentation of elastic solids with a rigid Vickers pyramidal indenter. Peter: Densification and flow phenomena of glass in indentation. Ernsberger: Role of densification in deformation of glasses under point loading. The political opposition has been calling for the dismissal of Błaszczak over that matter.F.M. Army leaders have pushed back against that claim, insisting they fulfilled their duties properly. Officials have said that no traces of explosives were found at the site where the aerial object was discovered.ĭefense Minister Mariusz Błaszczak this week pointed to the operational commander of the armed forces as being to blame for not properly informing political leaders of the object. The National Security Bureau, a body that advises the president on security and defense matters, said Friday that its head, Jacek Siewiera, and Duda were informed on April 26 about the object, which the bureau said "may be a Russian-made cruise missile.” President Andrzej Duda and Prime Minister Mateusz Morawiecki were only informed of the December airspace incursion in late April. The issue is raising questions about the authorities' handling of its air defenses amid new risks created by the war in Ukraine. ![]() Polish military and political officials are also facing questions about another object that landed on Polish territory in December, but which was only discovered in April by chance by a member of the public who was riding her horse in a forest. Western officials said they believed a Ukrainian air defense missile went astray as Ukrainian air forces tried to repel a large-scale attack by Russia. In November, two Polish men were killed when a missile landed in eastern Poland. The development reported Saturday follows two other known incursions into Poland's airspace since Russia launched its full-scale invasion of Ukraine, which lies on Poland's eastern border. The ministry said that the Territorial Defense Forces were deployed to search for the object. The ministry tweeted that radar contact with the object was lost near Rypin, a town in central Poland 143 kilometers (89) northwest of the capital, Warsaw. Warsaw, Poland: Poland's Defense Ministry said Saturday that it has detected an object in Polish airspace that flew in from the direction of Belarus, and that it's probably an observation balloon. ![]()
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