Unilibrary. Oliy ta'lim muassasalarining yagona elektron kutubxona axborot tizimi.

Principles of Electronic Communication Systems

This new third edition of Principles of Electronic Communication Systems is fully revised and updated to make it one of the most current textbooks available on wireless, networking, and other communications technologies. Because the field of electronic communications changes so fast, it is a never-ending challenge to keep a textbook up to date. While principles do not change, their emphasis and relevance do as technology evolves. Furthermore, students need not only a firm grounding in the fundamentals but also an essential understanding of the real world components, circuits, equipment, and systems in everyday use. This latest edition attempts to balance the principles with an overview of the latest techniques.

МЕДНЫЕ МОНЕТЫ ЦЕНТРАЛЬНОЙ АЗИИVIII-X ВВ.

абота посвящена истории возникновения медного раннемусульманского чекана на террито-рии Центральной Азии, его дальнейшего развития и трансформации. В книге рассматривается история сложения и развития формуляра медных монетVIII-X вв., разработана методика источ-никоведческого анализа данного вида исторического источника.

OʻZBEKISTON ARXEOLOGIYASI

Ўрта Осиё, неолит, маданият, индустрия, макро-микроиндустрия, учириндили-пластинали индустрия, Калтаминор, Ҳисор, Марказий Фарғона, Сазаған, Қайнар Камар, Тўда-1. Мақола Ўрта Осиё неолит даври маданиятларининг айрим хусусиятлари ва улардаги индустриал комплексларнинг номланиши борасидаги мулоҳозаларга бағишланган

Геодезия

В учебнике дано описание принципов работы современных геодезических приборов и инструментов, геодезических и фотограмметрических работ при изысканиях, проектировании, строительстве и эксплуатации сооружений, освещены основы обмеров зданий и сооружений геодезическими и фотограмметрическими методами.

MEHMONXONA INTERERI VA LANDSHAFTI

Hozirgi kunda turizmning, nafaqat, tarixiy yoki an’anaviy, balki, yangidan-yangi turlari, shakl hamda ko‘rinishlari vujudga kelmoqdaki, bu yangi tendensiyalar mazkur sohani valyuta kirib keluvchi manba sifatidagina emas, mintaqaviy rivojlanishning asosiy faktorlaridan biri deb qabul qilinishiga olib kelmoqda.

O’ZBEKISTON ARXEOLOGIYASI

Ушбу мақола2018-йилда Қанқа шаҳристонидан аниқланган бир қатор ноёб топилмаларга бағишланади. Булар орасида нилуфар қиёфасида ишланган, тахтда ўтирган Будданинг кичик бронза ҳайкалчаси муҳим топилма ҳисобланади.

ҚАЗАҚ ӘДЕБИЕТІ ТАРИХЫ

Ежелден тарихы тамырлас, мәдени құндылыктары ортак, гасырлар бойы ынтымағы жараскан бауырлас халыктар, өзбектер мен казактарды егемендік алған ширек ғасыр бойы айнымас достық пен татулық, дін, тіл, тарих, салт-дәстүр сынды ортақ рухани құндылықтар біріктіріп келе жатыр. Сол ортақ құндылықтардың арқасында екі елдің әдеби және мәдени карым-қатынасы тұрактылық пен бейбітшілікті нығайтудың кепілі болып қызмет аткаруда. «...жас ұрпақтың рухани-интеллектуал дәрежесін, санасы мен дүниетанымын арттыру, Отанға және халқына деген шексіз махаббат сезімін оятуда және ұрпақ тәрбиелеуде кітап оқу мәдениеті ерекше манызға ие. Өткізілген бақылау мен талқылаулар нәтижесінде бұл салада өз шешімін табу кажет болған өзекті проблемалар бар екені айқын.

O’ZBEKISTON ARXEOLOGIYASI 10

Мақола Ўзбекистон ҳудудида содир бўлган илк антропогенез жараѐнлари тарихининг шартли даврий чегараларини аниқлашга, ўша даврдаги табиий иқлим шароит хусусиятларини ўрганишга бағишланган.

High Frequency Techniques. An Introduction to RF and Microwave Engineering

A practical guide for today’s wireless engineer. High Frequency Techniques: An Introduction to RF and Microwave Engineering is a clearly written classical circuit and field theory text illustrated with modern computer simulation software. The book’s ten chapters cover: The origins and current uses of wireless transmission. A review of AC analysis, Kirchhoff’s laws, RLC elements, skin effect, and introduction to the use of computer simulation software. Resonators, Q definitions, and Q-based impedance matching. Transmission lines, waves, VSWR, reflection phenomena, Fano’s reflection bandwidth limits, telegrapher, and impedance transformation equations. Development and in-depth use of the Smith Chart Matrix algebra with Z, Y, ABCD, S, and T matrix applications. An unusually thorough introduction to electromagnetic field theory, step-by-step development of vector calculus, Maxwell’s equations, waveguides, propagation, and antennas. Backward wave, branch line, rat race and Wilkinson couplers, impedance measurements, and detailed even and odd mode analysis.

Wireless Transceiver Design. Mastering the Design of Modern Wireless Equipment and Systems

Building upon the success of the first edition (2007), Wireless Transceiver Design 2nd Edition is an accessible textbook that explains the concepts of wireless transceiver design in detail. The architectures and the detailed design of both traditional and advanced all-digital wireless transceivers are discussed in a thorough and systematic manner, while carefully watching out for clarity and simplicity. Many practical examples and solved problems at the end of each chapter allow students to thoroughly understand the mechanisms involved, to build confidence, and enable them to readily make correct and practical use of the applicable results and formulas. From the instructors' perspective, the book will enable the reader to build courses at different levels of depth, starting from the basic understanding, whilst allowing them to focus on particular elements of study. In addition to numerous fully-solved exercises, the authors include actual exemplary examination papers for instructors to use as a reference format for student evaluation.

Moliya: Korxonalar moliyasi

Mazkur darslikda moliya tizimining shakillanishida korxonalar moliyasining tutgan o'rni,korxonalarining moliya-kredit tashkilotlari bilan munosabatlari,korxona foydasini shakillantirish va taqsimlash tartibi,korxonalarni soliqqa tortish va investitsiyaviy faoliyuatni tashkil etish yo'llari,korxonalarda o'z kapitali va bahoni shakillantirish xusisiyatlari, korxonalarda moliyaviy rejalashtrishning mohiyati keltirilgan.

Wireless Communications. Principles and Practice

As cellular telephones become commonplace business tools, interest in wireless technology is booming. This book responds to that demand with a comprehensive survey of the field, suitable for educational or technical use. Materials are drawn from academic and business sources, numerous journals, and an IEEE professional reader. Extensively illustrated, Wireless Communications is filled with examples and problems, solved step by step and clearly explained.Wireless Communications covers the design fundamentals of cellular systems, including issues of frequency reuse, channel assignments, radio propagation, and both analog and digital modulation techniques. Speech coding, channel coding, diversity, spread spectrum, and multiple access are also discussed.

Bino va Inshootlar xavfsizligi.

Mazkur darslik oliy o‘quv yurtlarida 61020200-Mehnat muhofazasi va texnika xavfsizligi bakalavriat ta’lim yo‘nalishida ta’lim olayotgan talabalariga mo‘ljallangan bo‘lib, mavzular, huquqiy-normativ hujjatlar, xalqaro, mahalliy standartlar, meyorlar va qoidalar, QMQ lar asosida tayyorlangan, shuningdek mutaxssislar ma’lumotlari va mahalliy hamda chet el adabiyotlaridan foydalanilgan holda ilmiy asoslab yozilgan.

Principles of Communication Systems

Suppose that two people, separated by a considerable distance, wish to communicate with one another. If there is a pair of conducting wires extending from one location to another, and if each place is equipped with a microphone and earpiece, the communication problem may be solved. The microphone, at one end of the wire communications channel, impresses an electric signal voltage on the line, which voltage is then received at the other end. The received signal, however, will have associated with it an erratic, random, unpredictable voltage waveform which is described by the term noise. The origin of this noise will be discussed more fully in Chaps. 7 and 14. Here we need but to note that at the atomic level the universe is in a constant state of agitation, and that this agitation is the source of a very great deal of this noise. Because of the length of the wire link, the received message signal voltage will be greatly attenuated in comparison with its level at the transmitting end of the link. As a result, the message signal voltage may not be very large in comparison with the noise voltage, and the message will be perceived with difficulty or possibly not at all. An amplifier at the receiving end will not solve the problem, since the amplifier will amplify signal and noise alike.

IQTISODIY T AHLIL NAZARIYASI

O'zbekiston Respublikasida jamiyat taraqqiyotmmg barcha jabhalarida, eng avvalo iqtisodiy sohada islohotlarni yanada chuqurlashtirish va erkinlashtirish borasida aniq dastur ishlab chiqilgan. Bu dasturning joriy etishdan ko'zlangan asosiy maqsad - O'zbekistonning demokratik va bozor islohotlarini am alga oshirish, jahon hamjamiyatiga keng integratsiyalashuvi va barqaror olg'a borishi uchun mustahkam zamin yaratishdir.

Microwave Filters, Impedance-Matching Networks, and Coupling Structures

The organization of this book has three general objectives. The first objective is to present fundamental concepts, techniques, and data that are of general use in the design of the wide range of microwave structures discussed in this book. The second objective is to present specialized data in more or less handbook form so that a designer can work out practical designs for structures having certain specific configurations, without having to recreate the design theory or the derivation of the equations. (However, the operation of most of the devices discussed herein is sufficiently complex that knowledge of some of the basic concepts and techniques is usually important.) The third objective is to present the theory upon which the various design procedures are based, so that the designer can adapt the various design techniques to new and unusual situations, and so that researchers in the field of microwave devices may use some of this information as a basis for deriving additional techniques.