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Passive Intermodulation : Concepts and Technology
Focusing on passive intermodulation (PIM), a common instance of distortion in high-power multi-channel communication systems, the book introduces the concepts and technology of PIM. In the context of "space-ground-object" integrated communication and increasing spectrum resource constraints, the PIM problem is becoming increasingly prominent, while microwave components and system-level PIM are facing new challenges.Based on the experience and achievements in engineering practice of the China Academy of Space Technology in Xi’an, this title describes the basic theory, generation mechanism, analysis and evaluation methods, location detection and suppression techniques for microwave components of spacecraft PIM from a theoretical and engineering perspective.Furthermore, the latest achievements of microwave component PIM are outlined in depth, along with operational guidance and paths for further advancement. This book will be a useful reference for researchers, engineers and students interested in microwave technology, satellite technology and mobile communication technology.Wanzhao Cui is a professor at the National key Laboratory of Science and Technology on Space Microwave, at the China Academy of Space Technology, Xi’an, China.His current research interests include microwave technology and satellite communication.Jun Li is a professor at the National key Laboratory of Science and Technology on Space Microwave, at the China Academy of Space Technology, Xi’an, China.He is engaged in research on microwave technology and satellite communication.Huan Wei is a senior engineer at the National key Laboratory of Science and Technology on Space Microwave, at the China Academy of Space Technology, Xi’an, China.Her expertise is in the field of space microwave technology.Xiang Chen is a senior engineer at the National Key Laboratory of Science and Technology on Space Microwave, at the China Academy of Space Technology, Xi’an, China.His research interests are microwave and millimeter wave technology.
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Passive Conflict
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G4M 12" Passive Speaker and 15" Passive Subwoofer
The G4M 12" Passive Speaker is designed to deliver powerful and clear sound for a wide range of applications. This speaker features a 12" woofer and a 1.35" compression driver that work together to produce rich deep bass and crisp detailed highs. The speaker features 2-pole Speakon input and output connections which ensure a reliable and secure connection to your audio system. Additionally the 35mm stand pole connection allows for easy integration with a range of stands and mounting hardware making it easy to set up and use. The G4M 15" Passive Sub is designed to deliver powerful and clear sound for a wide range of applications. This speaker features a 15" woofer with a 3" voice coil together they help produce rich detailed and deep bass. With a power handling capacity of 500W RMS 1000W peak power and a frequency response of 35Hz to 160Hz the G4M 15" Passive sub is capable of delivering high-quality audio for both music and sound design applications. It also has a sensitivity of 96dB and an impedance of 8 ohms making it compatible with a wide range of amplifiers and audio systems. This bundle includes a speaker pole and cable.
Price: 449.99 € | Shipping*: 0.00 € -
G4M 15" Passive Speaker and 18" Passive Subwoofer
The G4M 15" Passive Speaker is designed to deliver powerful and clear sound for a wide range of applications. This speaker features a 15" woofer and a 1.35" compression driver that work together to produce rich deep bass and crisp detailed highs. The speaker features 2-pole Speakon input and output connections which ensure a reliable and secure connection to your audio system. Additionally the 35mm stand pole connection allows for easy integration with a range of stands and mounting hardware making it easy to set up and use. The G4M 18" Passive Sub is designed to deliver powerful and clear sound for a wide range of applications. This speaker features an 18" woofer with a 3" voice coil together they help produce rich detailed and deep bass. With a power handling capacity of 500W RMS 1000W peak power and a frequency response of 35Hz to 150Hz the G4M 15" Passive sub is capable of delivering high-quality audio for music and sound design applications. It also has a sensitivity of 96dB and an impedance of 8 ohms making it compatible with a wide range of amplifiers and audio systems. This bundle includes a speaker pole and cable.
Price: 529.99 € | Shipping*: 0.00 €
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Handbook of Research on Science Teacher Education
This groundbreaking handbook offers a contemporary and thorough review of research relating directly to the preparation, induction, and career long professional learning of K–12 science teachers. Through critical and concise chapters, this volume provides essential insights into science teacher education that range from their learning as individuals to the programs that cultivate their knowledge and practices.Each chapter is a current review of research that depicts the area, and then points to empirically based conclusions or suggestions for science teacher educators or educational researchers.Issues associated with equity are embedded within each chapter.Drawing on the work of over one hundred contributors from across the globe, this handbook has 35 chapters that cover established, emergent, diverse, and pioneering areas of research, including: Research methods and methodologies in science teacher education, including discussions of the purpose of science teacher education research and equitable perspectives; Formal and informal teacher education programs that span from early childhood educators to the complexity of preparation, to the role of informal settings such as museums; Continuous professional learning of science teachers that supports building cultural responsiveness and teacher leadership; Core topics in science teacher education that focus on teacher knowledge, educative curricula, and working with all students; and Emerging areas in science teacher education such as STEM education, global education, and identity development. This comprehensive, in-depth text will be central to the work of science teacher educators, researchers in the field of science education, and all those who work closely with science teachers.
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Brodit Passive holder
Brodit Passive holder
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Passive earmuffs Num'axes
The use of firearms, lawnmowers and jackhammers exposes the hearing system to loud noises that can cause side effects such as ringing in the ears and hearing loss.CAS1047 noise-cancelling headphones significantly attenuate ear-damaging noise. They reduce dangerous sounds by an average of 28 dB.Product benefitsSlimmer shells for easier shoulder supportFoldable, compact helmetLightweightAdjustable, comfortable padded headbandCAS1047 earmuff featuresNoise attenuation of approx. 28 dB (SNR): H=33 dB M=25 dB L=17 dB2-year warrantyErgonomicsWeight: 203 gAvailable in two colors: black or orange1 CAS1047 black or orange earmuff1 user guide
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Zebra TC5NG PASSIVE NO CHARGE VEHICLE HOLDER Passive holder Mobile com
Zebra TC5NG PASSIVE NO CHARGE VEHICLE HOLDER Passive holder Mobile computer Black
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