Xorijiy tillarni o’qitishda didaktik o’yinlarning ahamiyati

Ushbu maqolada xorijiy tillarni o’qitishda didaktik o’yinlarning o’rni hamda didaktik o’yinlarning ta’lim sifatini oshirishdagi ahamiyati haqida muhokama qilinadi, tavsiyalar beriladi

Ikkilamchi polietilentereftalatning mexanik qayta ishlash retsikli

Hozirgi kunda ishlab chiqarishning, fan va texnikaning rivojlanishi atrof-muhitga ko’plab turli chiqindilarning to’planishiga sabab bo’lmoqda. Yer aholisi soni o’tgan asrning boshidan to yangi asrning shu kunigacha bir necha barobar o’sdi. Bu esa o’z yo’lida ularni hayotiy zarur mahsulotlar bilan ta’minlash uchun mamlakatlarda ko’plab zavod-fabrikalarning qurilishiga, plastik chiqindilarning ko’payishiga olib keldi. Oqibatda tabiat ayovsiz ishlatildi va ishlatilmoqda va uning o’zi turli chiqindilar bilan to’lib toshmoqda. Ushbu maqolada polietilentereftalat chiqindilarini qayta ishlash usullari keltirilgan

KIBERXAVFSIZLIKDAN HIMOYALANISHDA IT (INFORMATION TECHNOLOGY) SOHASINI AHAMIYATI VA ZARURLIGI

Bugungi axborortlashuv asrida har bir sohadagi turli ko‘rinishdagi xavf-xatarlarni hisobga olgan holda, ularni oldindan bartarf etishda muhim hisoblangan, “Information technology”(axborotlashgan qurilmalar) vositalarini joriy etishdan iboratdir. Bugungi jamiyatda axborotlarni izlash, ularni qayta ishlash va tarqatish muhim sanalib, ularni ishonchliligi hamda to‘liqligini ta’minlash zarur hisoblanadi. Chunki, shu orqali kiberxavfsizlikni ta’minlashimiz mumkin bo‘lad

CO2 reduction over Cu-ZnGaMO (M = Al, Zr) catalysts prepared by a sol-gel method: Unique performance for the RWGS reaction

Cu-ZnGaMO (M = Al, Zr) catalysts prepared by a surfactant-free sol-gel method were characterized and tested in the reverse water-gas shift (RWGS) reaction. Their catalytic behavior was analyzed under 0.1–3 MPa at 250–325 °C and using a reactant mixture of CO2/H2 = 1/3. The catalytic results are analyzed in the light of the characteristics of the catalysts. The Cu-ZnGaZrO catalysts were highly selective for the RWGS reaction; a major role of surface copper and interface oxygen vacancies is proposed. CO2 conversion and CO selectivity increased on increasing the reaction temperature. CO2 conversion reaches 16.8% with 99.7% selectivity for CO under 0.1 MPa at 325 °C over the Cu-ZnGaZrO1 catalyst. It is suggested that CO and methanol production proceed via independent reaction pathways

Analysis of patterns in the formation of phase composition during thermal and thermocyclic treatment of maraging steel

The paper studies changes in the phase composition of typical maraging steel. The analysis performed made it possible to determine the amount of retained austenite depending on the modes of thermal and thermocyclic treatment with heating in the temperature range of α-γ transformation. The processes occurring during heating in the region of α-γ transformation are divided into two temperature regions. As a result, it is noted that the identified patterns in the formation of the phase composition during thermal and thermocyclic treatment with the temperature range of α-γ transformation make it possible to both control changes in the phase composition and properties of steel and predict these changes

Methane steam reforming over Ir/Ce0.9Gd0.1O2-x:m catalytic and redox properties

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