Results 131 to 140 of about 261,383 (301)
A Low-Density Parity-Check Code Search Algorithm for Low Peak-to-Average Power Ratio
, 2007 Orthogonal Frequency Division Multiplexing (OFDM) is popular modulation scheme for wireless system. Because OFDM has advantages of multipath-delay-spread tolerance, immunity to frequency selective fading channel and high spectral efficiency, many ...
范君霖, Fan, Chun-Lin
core
Creating Ti–Fe α/β Alloys by Diffusion‐Driven Solid‐State Processing
Advanced Engineering Materials, EarlyView.This study proposes making alloys containing fast diffusing elements that are difficult to produce by ingot metallurgy, by diffusion‐driven solid‐state HIP processing of elemental powders and low‐temperature homogenisation. Here, novel Fe‐Ti α–β alloys are formed having fine α–β lamellae, a small β prior grain size without significant intermetallics ...
Jiaqi Xu +10 more
wiley +1 more source
Advanced Engineering Materials, EarlyView.A simplified thermoplastic pultrusion model is developed to predict thermal fields in glass fiber/polyethylene terephthalate (GF/PET) composites with reduced computational cost. By combining effective material homogenization, validation against literature data, and Gaussian‐process‐based optimization, the study reveals how heating limits, pulling speed,
Elder Soares +3 more
wiley +1 more source
Advanced Engineering Materials, EarlyView.Additive manufacturing provides precise control over the placement of continuous fibres within polymer matrices, enabling customised mechanical performance in composite components. This article explores processing strategies, mechanical testing, and modelling approaches for additive manufactured continuous fibre‐reinforced composites.
Cherian Thomas, Amir Hosein Sakhaei
wiley +1 more source
Phase Field Failure Modeling: Brittle‐Ductile Dual‐Phase Microstructures under Compressive Loading
Advanced Engineering Materials, EarlyView.The approach by Amor and the approach by Miehe and Zhang for asymmetric damage behavior in the phase field method for fracture are compared regarding their fitness for microcrack‐based failure modeling. The comparison is performed for the case of a dual‐phase microstructure with a brittle and a ductile constituent.
Jakob Huber, Jan Torgersen, Ewald Werner
wiley +1 more source
Karl Popper and the Mechanisms of Hydrogen Embrittlement
Advanced Engineering Materials, EarlyView.Representation of the beginning of loss of ductility rather than embrittlement. Small concentrations of hydrogen in a diffusible form within iron are well‐established to harm the mechanical integrity of steels. There are theories that attempt to explain the pernicious role of hydrogen.
H. K. D. H. Bhadeshia
wiley +1 more source
Overview on Crest Fator Reduction Techniques to Reduce Peak-to-Average Power Ratio in OFDM Signals [PDF]
, 2009 Aquest TFC consisteix en l'estudi i desenvolupament en matlab d'algunes de les tècniques de reducció de la potència de pic dels senyals OFDM. L'objectiu és la reducció del peak-to-average power ratio (PAPR)dels senyals a fi d'obtenir una amplificació en ...
López Caro, Alberto
core +1 more source
A Bit-Wise XOR Method to Reduce Peak-to-Average Power Ratio for OFDM Systems
, 2007 無線通道本身有許多的效應，包括信號隨路徑迅速衰減、訊號與訊號彼此之間的干擾、雜訊干擾、不同頻道彼此干擾、與多路徑的問題等，導致高速的傳輸不易應用在無線接取網路。正交載波分頻多工調變系統本身是多載波調變技術的一種，它能夠利用增加循環字首與在接收端使用簡單的等化器以抵抗干擾與多路徑的問題。隨著數位電路技術的進步，正交分頻多工調變系統複雜的調變器可以使用快速的反傅立葉轉換法實現。雖然它擁有這些優點，然而，它的訊號波形變化非常大，通常我們可以把這現象量化成峰均比來衡量與判斷系統的優劣 ...
Huang, Vuyan, 黃富源
core
Microstructure Evolution of a VMnFeCoNi High‐Entropy Alloy After Synthesis, Swaging, and Annealing
Advanced Engineering Materials, EarlyView.The synthesis and processing (rotary swaging and annealing) of the novel VMnFeCoNi alloy is investigated, alongside the estimation of the grain size effect on hardness. Analysis of a wide grain size range of recrystallized microstructures (12–210 µm) reveals a low annealing twin density.
Aditya Srinivasan Tirunilai +6 more
wiley +1 more source
Tailoring Functional Properties of Ti–Ni–Cu Shape Memory Alloy Thin Films for MEMS Actuators
Advanced Engineering Materials, EarlyView.A comprehensive study of critical parameters required to develop well‐performing Ti–Ni–Cu thin film shape memory alloy microactuators is provided. Materials science and device integration aspects are integrated by addressing structural and physical relationships using complementary characterization techniques as well as a practical fabrication solution
Elaheh Akbarnejad +6 more
wiley +1 more source