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TUPROQ KIMYOSI

Tuproq tirik mavjudot hayot-mamoti negizidir, deb aytgan edi o‘z zamonasida Abu Ali Ibn Sino. Hozir ham bu fikr o‘z kuchi va qiymatini yo‘qotgani yo‘q. Tuproqni kimyoviy nuqtayi nazardan o‘rganish eng avvalo uning unumdorlik darajasini oshirishga qaratilmog‘i darkor. Bu boradagi qilingan ilmiy ishlar ko‘p. Biroq ular hozirda aniq bir tizimga muhtoj. Har bir fan o‘z nazariyasi, uslubiyoti va tarixiga ega bo‘lgani kabi tuproqlar kimyosi ham o‘z tarixiga ega. Bu tarix o‘z navbatida bevosita tuproq xususiyatlari, uning sifat belgisi bilan bog‘liq bo‘lib, tuproq fazalarining kimyoviy tarkibi, jarayonlari va ulami boshqarish yoTlarini o‘rganadi. Tuproq kimyosining o‘rganilish tarixi qadimdan boshlangan boTib, u o‘z ichiga bir qancha davrlarni oladi.

TUPROQ BONITIROVKASI

Sug‘oriladigan, lalmikor tuproqlami bonitirovkalashda tuproqning asosiy xususiyatlari va tabiiy sharoitlariga ko‘ra pasaytirish omillari yoritilgan. Qishloq xo‘jaligiga mo'ljallangan yerlami qiymat bahosini (me’yoriy narxini) aniqlash, qishloq xo'jaligi ekinlarining hisoblab chiqilgan me’yoriy hosildorligi, yalpi mahsulot va daromad ko'rsatkichlari tavsifi berilgan. Darslik universitetlaming agrokimyo va agrotuproqshunoslik, tuproqshunoslik, tuproq bonitirovkasi yo'nalishlari uchun yozilgan bo'lib, undan yer tuzuvchilar, agroiqtisodchilar, agronomlar va boshqa qishloq xo'jalik hodimlari hamda qishloq xo'jalik kollejlari talabalari foydalanishlari mumkin.

Высшая математика

Профессионально ориентированный учебник содержит вопросы аналитической геометрии на плоскости, основы математического анализа, элементы теории вероятностей и математической статистики.

MIKROBIOLOGIY A IMMUNOLOGIYA VIRUSOLOGIYA

M ikrobiologiya (yunoncha m ikros — kichik, bios — hayot va logos — ta’lim ot) — m ayda, sodda, k o ‘zga ko 'rin m ay d ig an bir hujayrali organizm lar haqidagi fan. Bu fan mikroblam ing hayot faoliyati, ular ta’sirida odam , hayvon va o 'sim lik lar organizm ida sodir bo'ladigan o ‘zgarishlar qonuniyatlarini o'rganadi. K eyingi y illard a m ik ro b io lo g iy a fani so h asid a shu q a d a r k o ‘p m a’lum otlar to'plandiki, endilikda u bir necha tarm oqlarga boMingan va bu tarm o q lar o ‘ziga xos riv o jlan ish y o 'lid a n b o rm o q d a. T ibbiyot, v eterin ariy a, san o at yoki tex n ik a, q ish lo q x o 'ja lig i, o z iq -o v q atlar mikrobiologiyasi. kosmik mikrobiologiya va boshqalar shular jumlasidandir. H ozirgi zam on tibbiyot m ikrobiologiyasi keng qam rovli soha b o ’lib, o ‘z navbatida bakteriologiya (bakteriyalar haqidagi ta" lim ot), virusologiya (viruslar haqidagi ta ’lim ot), im m unologiya (organizm ning patogen va patogen boMmagan mikroorganizm lardan ham da organizm ga irsiy jihatdan begona b o ’lgan antigenlardan him oya qiladigan vositalarini o'rganadi), m ikologiya (odam organizm iga ziyoni b o 'lg an zam b u ru g 'lar faoliyatini o 'rganadi), protozoologiya (bir hujayrali patogen sod d ajo n iv o rlar hayot faoliyatini o'rganadi) kabi fanlarga bo'linadi.

Благоустройство о обустройство автомобильных дорог

В книге изложены основы благоустройства и обустройства автомобильных дорог комплексы обслуживания дорожного движения озеленения автомобильных дорог ограждения и их классификация дорожные знаки принципы их расстановки проектирования и эксплуатация систем освещения автомобильных дорог.

Introduction to Wireless Communication Circuits

Over the past decade the tremendous development of wireless communications has changed human life incredibly. Considerable advancement has been made in the design and architecture of communications related RF and microwave circuits. This book is focused on special circuits dedicated to the RF level of wireless communications. From oscillators to modulation and demodulation and from mixers to RF and power amplifier circuits, the topics are presented in a sequential manner. A wealth of analysis is provided in the text alongside various worked out examples. Related problem sets are given at the end of each chapter. Basic concepts of RF analog circuit design are developedin the book.

Electronic Communications

The major additions to the fourth edition are new chapters on digital signals and digital communications. Many of the other chapters have been considerably expanded, and new problem sets have been added. Mathcad1 has been introduced as a tool for problem solving, but the problems are formulated in such a way that these can be solved using other computer packages, or a good calculator. Although there are many powerful software packages available for circuit and system analysis, most are too highly specialized to be included here. A more general program such as Mathcad requires the user to be able to formulate the physical concepts in mathematical terms, which requires a good understanding of the underlying theory. Also, algebraic manipulation, with its attendant errors, can usually be avoided, as can simplifying assumptions which limit accuracy in certain instances.

Аудит

Дарслик Давлат таълим стандартининг талабларига мувофиқ тайёрланган бўлиб, хўжалик юритувчи субъектлар молиявий-хўжалик фаолиятининг аудиторлик текшируви услубиёти ва усулларига бағишланган.

Muhandislik va kompyuter grafikasi

Darslikda ortogonal proyeksiyalash va ularni qayta tuzish, tasvirlar va detallarning fazoviy shakli, muhandislik chizmalari hamda konstruktorlik xujjatlarining yogona tizimi to‘g‘risida ma’lumotlar keltirilgan. Shuningdek, darslikda fan dasturining mashinasozlik chizmachiligi bo‘limi yuzasidan tala-balar topshirishi shart bo‘lgan, grafik ishlar topshiriqlarining mazmuni va ularni bajarish bo‘yicha tavsiyalar berilgan.

Qayta tiklanuvchi energiya manbalari va foydalanish texnologiyalari

Darslikda QTEM va ulardan qishloq va suv xo‘jaligida foydalanishning hozirgi holati va rivojlanishi, energetik xavfsizligi va ekologik muammolari, quyosh, shamol, kichik suv oqimi, biomassa va past potensialli energiya manbalar to‘g‘risida ma’lumotlar va ushbu energiya manba’laridan ishlaydigan texnik vositalarning parametrlarini hisoblash va tanlash yoritilgan.

Estrada cholg'ularini chalishni o'rgatish uslubiyoti

Ushbu o'quv qo'llanma o'rta maxsus musiqa o'quv yurtlarida tahsil oluvchio'quvchilarga esrada cholg'ulari ijrochiligi sir-asrorlarini atroflicha o'rgatish bjrasida uslubiy ko'rsatmalar beruvchi muhim manbadir.

EPIZOOTOLOGIYA VA INFEKSION KASALLIKLAR

“Epizootologiya” atamasi “epizootiya” va “logos” tushunchalaridan iborat. Epizootiya (gr. epi - yuzasi, zoon - hayvon) - epizootik jarayon intensivligining o'rtaeha darajasi bo‘lib, infeksiyaning nosog'lom manzil chegarasidan chiqib, viioyat, hatto respublika va mamlakatlar bo‘ylab tarqalishidir. Logos - ta’limot. Ammo, epizootologiya birgina epizootiyani o‘rganib qolmasdan, u kasallik qo‘zg‘atuvchilaming patogenlik xususiyati bilan organizm o'rtasidagi o‘zaro ta’sir mexanizmlarini, ya’ni hayvonlar o‘rtasida infeksion kasalliklarning kelib chiqishi, namoyon bo'lishi, tarqalishi, so'nishi hamda ulaming oldini olish va bartaraf etishning ob’ektiv qonuniyatlarini o'rganadigan fandir. Epizootologiya 2 ta vazifani bajaradi: - birinchidan, kasallikning kelib chiqish sababini, bir xil namoyon bo‘lmasligini, tarqalishini, infeksiyaning so‘nishini va yo‘qolishini (epizootik jarayon mohiyatini), tashqi muhitning epizootik jarayon intensivligiga ta’sirini, bir so‘z bilan aytgauda, epizootik jaiayormi o'rganadi;

The RF and Microwave Handbook

The recent shift in focus from defense and government work to commercial wireless efforts has caused the job of the typical microwave engineer to change dramatically. The modern microwave and RF engineer is expected to know customer expectations, market trends, manufacturing technologies, and factory models to a degree that is unprecedented in the history of RF/microwave engineering. With a broad, balanced range of material, The RF and Microwave Handbook provides you with the means to understand and use these factors to improve your overall performance. With contributions from 100 prominent researchers and practitioners, this outstanding work is filled with essential information on microwave theory, techniques, and applications. It provides an overview of microwave and RF products including both existing and emerging commercial wireless applications, such as cellular phones and wireless LANs, as well as traditional military applications such as radar and electronic countermeasures.

Principles of Communications: Systems, Modulation and Noise

Sections on important areas such as spread spectrum, cellular communications, and orthogonal frequency-division multiplexing are provided. Computational examples are included, illustrating how to use the computer as a simulation tool, thereby allowing waveforms, spectra, and performance curves to be generated. Overviews of the necessary background in signal, system, probability, and random process theory required for the analog and digital communications topics covered in the book.

ЦИТОЛОГИЯ С ОСНОВАМИ ПАТОЛОГИИ КЛЕТКИ

Первое описание клетки - элементарной структурной и функ­ циональной единицы живых организмов, было сделано более 300 лет назад. Увидеть и изучить ее позволил изобретенный в 17 веке микроскоп. До сих пор нельзя с уверенностью назвать имя его соз­ дателя. По одним данным это были голландские оптики отец и сын Ганс и Захарий Янсен (1590 г.), по другим - Галилео Галилей, сконструировавший в 1609 году сначала «земную зрительную тру­ бу» (подзорную трубу), а затем на ее основе первый микроскоп. Кто бы ни являлся автором этого оптического прибора, он, несо­ мненно, сделал великое изобретение.

Amsats and Hamsats. Amateur Radio and other Small Satellites

Amsats and Hamsats provides a step by step guide to how you can communicate through amateur radio satellites and how to receive signals from other small satellites and 'weather' satellites. The book gets right into the techniques you will need for working amateur radio stations through amateur radio satellites, then moves on to listening, or watching, signals from other satellites. There are chapters answering questions like, ‘how do satellites stay in orbit’ and ‘why are they so expensive to launch?’ Followed by sections about the history of amateur radio satellites, the mathematics governing orbits, TLE files, different types of satellite and their orbits. It covers the equipment you need, to track and use the amateur satellites and some of the satellite tracking software that is available. There are detailed sections covering transponders, satellite bands, feeders, masthead preamplifiers, antenna systems and automated rotator control.