2,547 research outputs found
On the topology of elliptic singularities
For any elliptic normal surface singularity with rational homology sphere
link we consider a new elliptic sequence, which differs from the one introduced
by Laufer and S. S.-T. Yau. However, we show that their length coincide. Using
the properties of both sequences we succeed to connect the common length with
the geometric genus and also with several topological invariants, e.g. with the
Seiberg--Witten invariant of the link
Mechanical and thermal induced phase transformations in superduplex stainless steel
The aim of this work is to study the microstructural changes in SAF 2507 type superduplex
stainless steel due to heat treatments and mechanical fatigue process. Specimens were heat
treated in the 400-1360 °C temperature range for 1 and 5 hours respectively. An other series of
specimens were periodically loaded by using a fatigue testing machine. The microstuctural
changes were investigated by using a complex micromagnetic measuring system which includes a
Barkhausen noise measuring and a magnetic harmonic analysing system. The RMS value of the
Barkhausen noise, the distortion factor (k), and magnetic coercivity values were measured. The
microstuctural changes were investigated by metallography using scanning electron microscope
A HARCI KUTATĂS-MENTĂS KEZDETI LĂPĂSEI
A harci kutatĂĄs-mentĂ©s a II. vilĂĄghĂĄborĂș kiterjedt lĂ©gi mƱveletei sorĂĄn vĂĄlt a haderĆ kĂ©pessĂ©geinek rĂ©szĂ©vĂ©. MegfelelĆ helyen Ă©s idĆben törtĂ©nĆ alkalmazĂĄsĂĄval kritikus harci kĂ©pessĂ©gek Ă©s emberi erĆforrĂĄsok ĂłvhatĂłk meg, miközben az ellensĂ©get Ă©rtĂ©kes felderĂtĂ©si adatoktĂłl fosztja meg. KiemelkedĆ jelentĆsĂ©ge van a harci morĂĄl, Ă©s vĂ©gsĆsoron a harci kĂ©pessĂ©gek fenntartĂĄsĂĄban. A cikk röviden ismerteti a nĂ©met, angol Ă©s amerikai tengeri lĂ©gi kutatĂĄs-mentĂ©s kezdeti lĂ©pĂ©seit, bemutatja a feladat vĂ©grehajtĂĄs sorĂĄn alkalmazott eszközöket, kikĂ©pzĂ©si mĂłdszereket, valamint az egyes orszĂĄgok ĂĄltal hasznĂĄlt eljĂĄrĂĄsokat. | Combat search and rescue became a part of military operational capabilities with the advent of largescale air operations during World War II. Applying in the right time and right place preserves critical combat resources while denying the enemy from a potential intelligence source. It is a key element in sustaining the morale, cohesion, and, ultimately, the operational performance of friendly forces. The article shortly describes the initial steps of German, English and US air sea rescue, and the procedures, training and equipments used by theese countries
HARCI KUTATĂS-MENTĂS AZ 1990-1991-es ĂBĂLHĂBORĂBAN
Az ĂbölhĂĄborĂș lĂ©gi hadjĂĄrata alatt a koalĂciĂłs erĆk 109876 [1] bevetĂ©st hajtottak vĂ©gre iraki cĂ©lpontok ellen, melyek eredmĂ©nyekĂ©nt megsemmisĂtettĂ©k Irak lĂ©gierejĂ©t, szĂĄrazföldi erĆinek többsĂ©gĂ©t Ă©s a nemzeti infrastruktĂș-ra nagy rĂ©szĂ©t. Az erĆs Ă©s szervezett iraki lĂ©gvĂ©delem ellenĂ©re a szövetsĂ©ges erĆk vesztesĂ©gei viszonylag alacso-nyak voltak, mindössze 43 repĂŒlĆgĂ©pet veszĂtettek ellensĂ©ges tƱz következtĂ©ben. Ugyanakkor a szemĂ©lyi mentĂ©se-ket tekintve a lĂ©gi hadjĂĄrat sorĂĄn lelĆtt 64 gĂ©pszemĂ©lyzet tag közĂŒl csak 3-at sikerĂŒlt kiemelni. A cikk megvizs-gĂĄlja, hogy mely körĂŒlmĂ©nyek segĂtettĂ©k elĆ a vesztesĂ©gek alacsony szinten tartĂĄsĂĄt, valamint a harci kutatĂł-mentĆ mƱveletek vĂ©grehajtĂĄsĂĄnak rĂ©szleteit, alacsony hatĂ©konysĂĄgĂĄnak lehetsĂ©ges okait. | Over the air campaign of the Gulf War the coalition forces had a total of 109876 sorties against Iraqi targets, while destroyed the air force, a major portion of its army, and a large portion of the national infrastructure. In spite of the strong and well organized Iraqi air defense system the coalition forcesâ losses were relatively few, with only 43 aircraft lost in combat. At the same time concerning the personal recovery only three of 64 downed aircrews were successfully picked up. The article investigates the circumstances leading to the low losses, the details of the combat search and rescue operations and the possible reasons of their low efficiency
A HARCI KUTATĂS-MENTĂS A VIETNĂMI HĂBORĂBAN
A harci kutatĂĄs-mentĂ©s megfelelĆ helyen Ă©s idĆben törtĂ©nĆ alkalmazĂĄsĂĄval kritikus harci kĂ©pessĂ©gek Ă©s emberi
erĆforrĂĄsok ĂłvhatĂłk meg. KiemelkedĆ jelentĆsĂ©ge van a harci morĂĄl, Ă©s vĂ©gsĆ soron a harci kĂ©pessĂ©gek fenntartĂĄsĂĄban.
A vietnĂĄmi konfliktus kezdetĂ©n az amerikai lĂ©gierĆ nem rendelkezett a feladat hatĂ©kony vĂ©grehajtĂĄsĂĄhoz
szĂŒksĂ©ges kĂ©pessĂ©gekkel. A hĂĄborĂș vĂ©gĂ©re a helyzet gyökeresen megvĂĄltozott, a tapasztalatok alapjĂĄn olyan
ĂŒtĆkĂ©pes szervezetet hoztak lĂ©tre, mely lefektette az alapjait a mai modern harci kutatĂĄs-mentĂ©snek. A cikk rövid
törtĂ©nelmi ĂĄttekintĂ©s utĂĄn ismerteti a harci kutatĂĄs-mentĂ©s fejlĆdĂ©sĂ©nek lĂ©pĂ©seit a vietnĂĄmi hĂĄborĂș alatt, beleĂ©rtve
a szervezeti vĂĄltozĂĄsokat, technikai eszközök fejlĆdĂ©sĂ©t, valamint az Ășj harceljĂĄrĂĄsok kidolgozĂĄsĂĄt is. | Applying combat search and rescue in the right time and right place preserves critical combat resources. It is a
key element in sustaining the morale, and ultimately, the operational performance of friendly forces. At the beginning
of the Vietnam conflict US Airforce did not have the capabilities for efficient combat search and rescue
mission. By the end of the war the situation had completely changed. Using the combat experiences a new combat
ready organisation was created, which laid down the basics of todays combat search and rescue. The article
after a short historical review describes the evolution of combat search and rescue during the Vietnam war,
including organizational changes, technological development, new technics and tactics
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