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

VHF and UHF Antennas

Describes a wide range of antenna designs and the fundamentals of their operation. Particular attention is paid to the effects of an antenna's ambient environment and the structure upon which it is mounted (permanent or mobile), and methods of predicting and measuring its performance. Antennas do not become obsolete since they are based on unvarying physical principles. Sometimes the applications for which specific antennas were developed themselves disappear and the antennas fall out of use. They may nevertheless be admirably suited for new applications. One purpose of this book is to present to the antenna engineer as wide a range of antennas as possible, to indicate their performance characteristics and to comment on any limitations. In the course of 46 years of antenna design, the author has on many occasions been able to adapt old designs to new applications simply because he was aware of the original design. If this book gives the reader new ideas for antennas it will have served that purpose.

Einführung in die Fachsprache der Betriebswirtschaft: Band II

Das Lehrwerk dient der sprachlichen Vorbereitung von Ausländern auf ein betriebswirtschaftliches Studium an einer Universität, Fachhochschule oder Wirtschaftshochschule, von Studenten technischer Disziplinen an Fachhochschulen auf ihre Betriebswirtschaftssemester und von Kandidaten auf fachorientierte Teile der "Prüfung Wirtschaftsdeutsch International", die vom Goethe-Institut, dem DIHT und der CDC entwickelt wurde.Es leistet ferner Vorbereitungsarbeit für WirtschaftsdeutschPrüfungen, die schwierigkeitsmäßig höher angesiedelt sind. Darüber hinaus wendet es sich an alle, die aus beruflichen oder ausbildungsmäßigen Gründen über grundlegende Terminologie aus der Betriebswirtschaftslehre verfügen und Fachtexte aus diesem Gebiet rezipieren oder produzieren müssen.

АНАЛИТИК ГЕОМЕТРИЯ ВА чизиқли АЛГЕБРА

Дярсликда аналитик геометрия ва чизи^ли алгебра асослари: детерминантлар назарияси, чизи^ли тенгламалар системаларини текши- риш, векторлар алгебраси элементлари.

Propagation Modeling for Wireless Communications

This chapter starts with a brief introduction into what are wireless communication systems and networks and their applications. Basic concepts and mechanisms driving the wireless propagation are briefly introduced depending on the different media (air, water, etc.) and modes (waves, particles etc.) used for communication. Readers are next motivated toward why we need to model the propagation environment, why modeling the environment is challenging and why it is crucial to come up with a model as accurate as possible. The chapter is rounded with some historical and philosophical perspectives. Today we cannot really imagine ourselves without a mobile phone. What is it used for? Mobile phones are used for communicating between two people that are separated by some amount of distance. According to Merriam-Webster, telecommunication is dened as communications at a distance. We generally associate mobile phones with telecommunications or wireless communications.

ANALITIK GEOMETRIYADAN MISOL VA MASALALAR II-qism

Ushbu o‘quv-metodik qo‘llanma Oliy ta’lim muassasalarining ,,Matematika” ta’lim yo‘nalishida tahsil olayotgan talabalar uchun mo‘ljallab yozilgan.

ALGEBRA VA SONLAR NAZARIYASI

O'quv qo'llanma «Algebra va sonlar nazariyasi» fani DavIat ta'lim standarti hamda dasturiga to'la mos keladi. Tavsiya etilayotgan nazariy savollar va amaliy topshiriqIar modullarda jamlangan bo'lib, ularda keltirilgan metodik tavsiyalar ushbu o'quv qo'llanmadan foydaIanuvchilarga keng imkoniyatlar yaratadi.

YARIMO’TKAZGICHLAR FIZIKASIDAN MASALALAR VA SAVOLLAR TO’PLAMI

Ushbu o'quv qo'llanma 4 xil qiyinlik darajasidagi savol, masala va testlai to'plamidan iborat. Birinchi va ikkinchi qiyinlik darajadagi savollar, mashqlai va masaialar to'plami elementar fizika hajmidagi vazifalar bo'iib, ular o'rta maxsus o'quv yurtlari o'quvchilari hamda yarimo'tkazgichiar fizikasidan masala yechishni o'rganmoqchi bo'lgan bakaiavrlar uchun mo'ljallangan.

Radio Wave Propagation Fundamentals

This completely updated second edition of an Artech House classic provides a thorough introduction to the basic principles of electromagnetic wave propagation of radio frequencies in real-world conditions, fully updated by including new achievements in theory and technology. It serves as an invaluable daily reference for practitioners in the field and as a complete, organized text on the subject. This comprehensive resource covers a wide range of essential topics, from the classification of radio waves, electromagnetic wave theory, and antennas for RF radio links, to the impact of the earth surface on the propagation of ground waves, atmospheric affects in radio wave propagation, and radio wave reception.

ЯРИМ УТКАЗГИЧЛАР ФИЗИКАСИ

Ушбу кулланмада каттик жисмлар физикасининг ярим утказгичлар кисмига тегишли зарурий тушунчалар х,акида кискача маълумот келти- рилган. Ярим утказгич моддалар, уларнинг тузилиши ва турлари, мазкур моддаларда электронлар х,амда коваклар статистикаси ва кинетик ходисалар назарияси асослари баён килинган.

Gidrotexnika ishlarini bajarish

Mazkur darslikda gidrotexnika qurilishiga oid bo`lgan ish turlari va ularni bajarish to`g`risidagi ma`lumotlar yozilgan. Kitobda fan bo`yicha umumiy ma`lumotlar yer beton temir beton yig`ish gidroizolyatsiya o`zan rostlash va boshqa ishlar hamda qurilish transportini tashkil qilish haqida materiallar berilgan.

ЯРИМ УТКАЗГИЧЛИ АСБОБЛАР ФИЗИКАСИ

Ушбу цулланмада ярим утказгичли асбоблар физикаеинии асосий булимлари буйича маълумотлар кслтирилган.

YARIMO'TKAZGICHLAR VA YARIMO'TKAZGICHLI ASBOBLAR TEXNOLOGIYASI

O'quv qo'llanmada Ydrimo'tkazglchlar haqida umumiy ma'lumotlar, yarimo'tkazgichli moddalar olish va Ydrimo'tkazgichli asboblar tayyorlash texnologiyasi bayon qilingan. Bundan tashqari, ma'vzularni chuqurroq o'zlashtirishga yordam beruvchi rdsmlar, jadvallar ilova qilingan.

OLIY MATEMATIKADAN TESTLAR TO’PLAMI I qism

Ushbu o'quv qo'Uanma texnika oliy o'quv yurtlarida bakalavrlar tayyorlash uchun mo ’Ijallangan bo ’lib, undan iqtisod yo ’nalishlari uchun ham foydalanish mumkin. О ’quv qo 'llanma "Oliy matematika ’’ fanining tasdiqlangan namunaviy dasturi asosida yaratilgan.

Muhandislik qidiruv asoslari

Darslikda loyihalashning turli bosqichlarida bajariladigan Muhandislik qidiruvni asosiy nazariyalari va usullari yoritilgan. Unda loyihalashning turlari va bosqichlari, injiner-geologik, gidrologik, injiner-geodezik va iqtisodiy qidiruvlar bayon etilgan. Injiner-geologik qidiruvlar guruntlarni xususiyatlari, tog`-jinslarini oddiylashtirilgan klassifikatsiyasi va ko`p uchraydigan fizik-geologik jarayonlar berilgan. Geodeziyani injiner-geologik qidiruvlardagi o`rniga e`tibor qaratilgan.

ЯДЕРНАЯ ФИЗИКА

Общий план книги и характер изложения не претерпели кардинальных изменений.

Introduction to Antenna Analysis Using EM Simulators

Electric current always and forever flows in complete loops. This basic bit of information is sometimes lost in the details of advanced antenna design, resulting in surprises when an antenna or circuit is turned on. Let's review this basic concept. Back in elementary school, we used two wires to connect a battery to a light bulb. The electrical appliances we use also have two wires (and possibly a third, but that is for safety). Thus, electricity requires a complete loop, going out one wire, and coming back the other. This is true for both direct current (DC) as with a battery, and for alternating current (AC) as in our electrical appliances. Both DC and AC systems are divided into three parts: the power supply (the battery, or wall outlet), the transmission line (the two parallel wires), and the load (lamp, or electrical appliance); see Figure 1.1. The devices that are sent electricity are typically called loads and include, for example, lamps, resistors, and integrated circuits (ICs).