Results 101 to 110 of about 36,924 (279)

Self‐Adaptive Anhydrous Passivation Mitigates Open‐Circuit Voltage Loss in Pb‐Sn Mixed Perovskite Solar Cells

Advanced Functional Materials, EarlyView.
In this report, a self‐adaptive anhydrous passivation strategy is introduced by incorporating trimellitic anhydride (TMAH) into the perovskite precursor. In situ hydrolysis of TMAH yields trimellitic acid (TMA); ‐C═O/‐COO− groups of TMAH/TMA form a chelate with undercoordinated Pb2+/Sn2+, regulate nucleation, promote (100) orientation, passivate ...
Md. Ataur Rahman, Md. Abdul Karim, Md. Emrul Kayesh, Siliang Cao, Shamim Ahmmed, Kiyoto Matsuishi, Ashraful Islam   +6 more
wiley   +1 more source

Glissile Interphase Boundaries Enable Collective Phase Switching in Epitaxial Polar Oxides

Advanced Functional Materials, EarlyView.
A triple point is identified in the phase diagram of low‐symmetry epitaxial BiFeO3 thin film along with an extended regime of phase competition associated with a flattened energy landscape. The electromechanical response is shown to be governed by correlated interphase‐boundary motion, including scale‐free avalanche dynamics characteristic of systems ...
Mohammad Moein Seyfouri, Oliver Paull, Ralph Bulanadi, Yasuhiro Sakamoto, Shintaro Yasui, Mikayla Lord, Mahak Chhabra, David Walker, Patrycja Paruch, Shery Chang, Nagarajan Valanoor, Daniel Sando   +11 more
wiley   +1 more source

The effects of I/Q imbalance of the performances of QPSK in uncoded and coded schemes : imbalance detection and compensation techniques [PDF]

, 2002
Analogue implementations of quadrature modulation circuits are usually imperfect and suffer from several impairments. Among these impairments, the amplitude imbalance and phase imbalance are the major source of signal distortions especially for direct ...
Wang, Yuan Dong
core  

Electro‐Steric Ion Confinement in Polyelectrolyte Networks for Robust Nonvolatile Artificial Synapse

Advanced Functional Materials, EarlyView.
Polyelectrolyte stoichiometry governs ion transport and retention in electrolyte‐gated synaptic transistors. A PSS‐rich network creates electro‐steric ion confinement that suppresses ion back‐diffusion and stabilizes channel doping, enabling robust nonvolatile synaptic memory, linear weight updates, and low‐energy operation.
Donghwa Lee, Jinbo Kim, Myeongjin An, Jisoo Park, Junho Sung, Eunsung Hwang, Suhwan Seok, Seong‐Min Bak, Jeonghun Kim, Eunho Lee   +9 more
wiley   +1 more source

A Compact QPSK Modulator with Low Amplitude and Phase Imbalance for Remote Sensing Applications

, 2012
A new, compact and wide-band Quadrature Phase Shift Keying (QPSK) modulator is presented for remote sensing applications. The microstrip-based modulator employs quadrature hybrid coupler, Wilkinson divider, rat race coupler and GaAs MESFET switches.
Mobeen, M. Kashan, Al-Naffouri, Tareq Y., Ghaffar, Farhan Abdul, Salama, Khaled N., Shamim, Atif   +4 more
core  

Modeling VSC with Active/Reactive Current Excitation and Internal Voltage Response for Grid Amplitude/Frequency Modulation Dynamics Analysis

CSEE Journal of Power and Energy Systems
Increasing penetration of power electronic (PE) grid-tied devices has caused more and more dynamic problems with unknown mechanisms. Since grid operation asks for a certain voltage amplitude and frequency level when there is a power imbalance, roles of ...
Xuan Gong, Xiaoming Yuan, Jiabing Hu, Sicheng Wang   +3 more
doaj   +1 more source

Integrated Balanced BPSK Modulator for Millimeter Wave Systems

Active and Passive Electronic Components, 2007
This paper details the design of integrated balanced PSK modulator using finline coplanar line hybrid junction. The PSK signal output is in suspended stripline with incident wave carrier in finline.
Ashok Mittal, Asok De
doaj   +1 more source

Blood Biomarkers and Surface‐Enhanced Raman Spectroscopy for Gout: A Comprehensive Review

Advanced Functional Materials, EarlyView.
Schematic illustrating gout disease progression from asymptomatic hyperuricemia to chronic tophaceous disease, highlighting the limitations of conventional imaging and biochemical diagnostics and the potential of engineered SERS platforms for ultrasensitive blood‐based detection of urate‐related biomarkers across disease stages, with the color gradient
Isuri Perera, Chiranjeevi Kanike, Appurva Tiwari, Hongyan Wu, Larry D. Unsworth, Ben Bin Xu, Xuehua Zhang   +6 more
wiley   +1 more source

Methods for quadrature modulator imbalance compensation

, 2008
Quadrature modulator (demodulator) is used in transmitting (receiving) part of many devices. Unwanted imbalance can influence amplitude, phase or DC offset of modulator (demodulator). Correction of imbalance was a main subject of thesis.
Povalač, Karel
core  

Optical transmitter IQ impairment estimation based on Kramers-Kronig receiving technology

Tongxin xuebao
Aiming at the problem of high cost of IQ impairment estimation for high-speed coherent optical transmitters, an IQ impairment estimation method of optical transmitter based on Kramers-Kronig receiving technology was proposed.
Gao Yuyang, Li Yufeng, Bao Sihong, Li Minghua, Zhang Fan, Zhou Xian   +5 more
doaj