Chaofeng Wu
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View article: Microscopic mechanisms of grain size effects on domain switching in sodium potassium niobate ceramics
Microscopic mechanisms of grain size effects on domain switching in sodium potassium niobate ceramics Open
Lead-free potassium sodium niobate [(K0.5Na0.5)NbO3, KNN]-based piezoceramics have emerged as promising alternatives to lead-based counterparts. Although grain-size effects in KNN ceramics have been widely investigated, most prior studies …
View article: Eliminating lead-exposure in nebulization therapy by lead-free piezoelectric
Eliminating lead-exposure in nebulization therapy by lead-free piezoelectric Open
Present main-stream medical ultrasonic nebulizers contain Pb(Zr,Ti)O3-based piezoceramics, which could expose the patients to toxic lead when the acidic liquid medicine, compounded with ultrasonic vibration, corrodes the piezoceramics. Eno…
View article: Fine‐Grain Densification in Faceted Grain Ceramics Via Chemical Modification
Fine‐Grain Densification in Faceted Grain Ceramics Via Chemical Modification Open
Densification of faceted grain ceramics, exemplified by lead‐free piezoelectric potassium sodium niobate (KNN), remains a longstanding challenge due to preferential grain growth and directional diffusion, which degrade performance and hind…
View article: Impact of Steel Slag Ratio on Strength and Durability of Flowable Waste Soil for Foundation Pit Backfill
Impact of Steel Slag Ratio on Strength and Durability of Flowable Waste Soil for Foundation Pit Backfill Open
In order to broaden the means of resource utilization of waste soil and steel slag produced in the process of urban construction, in this study, steel slag was used to replace part of the cement with waste soil, to prepare flowable waste s…
View article: Field‐Induced Polarization Rotation in Order–Disorder (K,Na)NbO<sub>3</sub>‐Based Ferroelectrics
Field‐Induced Polarization Rotation in Order–Disorder (K,Na)NbO<sub>3</sub>‐Based Ferroelectrics Open
Phase boundary is highly recognized for its capability in engineering various physical properties of ferroelectrics. Here, field‐induced polarization rotation is reported in a high‐performance (K, Na)NbO 3 ‐based ferroelectric system at th…
View article: Defect engineering induced phase competition in BNT-based relaxor ferroelectrics for dielectric energy storage
Defect engineering induced phase competition in BNT-based relaxor ferroelectrics for dielectric energy storage Open
Dielectric capacitors are independent in advanced electronics and pulse power systems as an energy storage and conversion medium. However, achieving high energy density at a low electric field remains challenging for dielectric materials t…
View article: Aliovalent Sm-doping enables BNT-based realxor ferroelectric ceramics with > 90% energy efficiency
Aliovalent Sm-doping enables BNT-based realxor ferroelectric ceramics with > 90% energy efficiency Open
Dielectric capacitors, as physical powers, are critical components of advanced electronics and pulse power systems. However, achieving high energy efficiency without sacrificing recoverable energy density remains a challenge for most diele…
View article: Low-field-driven large strain in lead zirconate titanium-based piezoceramics incorporating relaxor lead magnesium niobate for actuation
Low-field-driven large strain in lead zirconate titanium-based piezoceramics incorporating relaxor lead magnesium niobate for actuation Open
Studies on the piezoelectric materials capable of efficiently outputting high electrostrains at low electric fields are driven by the demand for precise actuation in a wide range of applications. Large electrostrains of piezoceramics in op…
View article: Origin of ultrahigh-performance barium titanate-based piezoelectrics: Stannum-induced intrinsic and extrinsic contributions
Origin of ultrahigh-performance barium titanate-based piezoelectrics: Stannum-induced intrinsic and extrinsic contributions Open
Despite the pivotal role of stannum doping in achieving ultrahigh piezoelectric performance in barium titanate-based ceramics, the fundamental mechanisms underlying this enhancement remain elusive. Here, we introduce a single variable nons…
View article: Stability and Controller Research of Double-Wing FMAV System Based on Controllable Tail
Stability and Controller Research of Double-Wing FMAV System Based on Controllable Tail Open
This study aimed to enhance the stability and response speed of a passive stabilized double-wing flapping micro air vehicle (FMAV) by implementing a feedback-controlled biomimetic tail. A model for flapping wings accurately calculated the …
View article: Insect‐scale fast moving and ultra‐load‐carrying robot
Insect‐scale fast moving and ultra‐load‐carrying robot Open
The load capacity of small robots plays a crucial role in practical applications. Drawing inspiration from biological load‐carrying mechanisms, a crawling robot based on piezoelectric bending is proposed. It is an insect‐scale piezoelectri…
View article: Application of the ‘online assessment + FOBT at home’ to improve participation and the efficacy of opportunistic screening for colorectal cancer: a retrospective cohort study
Application of the ‘online assessment + FOBT at home’ to improve participation and the efficacy of opportunistic screening for colorectal cancer: a retrospective cohort study Open
Background Colorectal cancer (CRC) screening faces two major challenges: insufficient screening coverage and poor adherence. A smartphone applet named “Early Screening Assistant (ESA)” was developed to create an online risk-assessment and …
View article: Caveolin-1 is critical for hepatic iron storage capacity in the development of nonalcoholic fatty liver disease
Caveolin-1 is critical for hepatic iron storage capacity in the development of nonalcoholic fatty liver disease Open
Background Nonalcoholic fatty liver disease (NAFLD) is associated with disordered lipid and iron metabolism. Our previous study has substantiated the pivotal role of Caveolin-1 (Cav-1) in protecting hepatocytes and mediating iron metabolis…
View article: Evolving electromechanical properties of defect engineered Pb(Zr,Ti)O3-based piezoceramics
Evolving electromechanical properties of defect engineered Pb(Zr,Ti)O3-based piezoceramics Open
Chemical modification is the frequently-adopted strategy to enhance the electromechanical properties of piezoelectric ceramics. However, chemically modified piezoelectric materials will inevitably produce point defects, such as dopant ions…
View article: An Insect-Scale Four-Winged Robot Designed by Flexure Hinge
An Insect-Scale Four-Winged Robot Designed by Flexure Hinge Open
This paper proposes a novel biologically inspired design for an insect-scale flapping robot. The proposed scheme employs two motors to drive four wings, mimicking the flapping motion of nat-ural four-winged insects. The vehicle incorporate…
View article: Calculation Model of Multi-Well Siphoning and Its Feasibility Analysis of Discharging the Groundwater in Soft Soil
Calculation Model of Multi-Well Siphoning and Its Feasibility Analysis of Discharging the Groundwater in Soft Soil Open
The use of a siphon is a drainage method that does not require the use of external power, and siphons are used extensively in practice. The application of siphons in the treatment of soft soils has become a popular approach in recent years…
View article: LPV Modeling and Robust Sampled-Data H∞ Control of a Tailless Flapping Wing Micro Aerial Vehicle With Parameter Uncertainties
LPV Modeling and Robust Sampled-Data H∞ Control of a Tailless Flapping Wing Micro Aerial Vehicle With Parameter Uncertainties Open
In order to achieve improved tracking performance, this paper considers the distinct features of tailless flapping wing micro air vehicles (FWMAVs), and proposes a robust $\bm{H_{\infty}}$ controller. A linear parameter Varying (LPV) model…
View article: Effects of Mn-doping on the structure and electrical properties of Sm-PMN-PT piezoceramics
Effects of Mn-doping on the structure and electrical properties of Sm-PMN-PT piezoceramics Open
Mn[Formula: see text]-modified [Formula: see text] ceramics were prepared via a solid-state reaction approach. Results of detailed characterizations revealed that the addition of Mn[Formula: see text] has influence on the grain size, and a…
View article: LPV modeling and PI-based H∞ Control for a Tailless Flapping Wing Micro Aerial Vehicle With Parameter Uncertainties and Input Saturation
LPV modeling and PI-based H∞ Control for a Tailless Flapping Wing Micro Aerial Vehicle With Parameter Uncertainties and Input Saturation Open
To overcome the aerodynamic and system parameters uncertainties of the tailless flapping wing micro aerial vehicle (FWMAV) caused by inaccurate measurement, we establish an linear parameter varying (LPV) model and propose a H∞ controller w…
View article: Ginsenosides Rg1 regulate lipid metabolism and temperature adaptation in Caenorhabditis elegans
Ginsenosides Rg1 regulate lipid metabolism and temperature adaptation in Caenorhabditis elegans Open
Rg1 reduced fat accumulation by regulating lipid metabolism via nhr-49 and enhanced stress resistance by its antioxidant effect in C. elegans.
View article: Robust Sampled-data H∞ Control Of Flapping Wing Micro Aerial Vehicles With Parameter Uncertainties and Actuator Saturation
Robust Sampled-data H∞ Control Of Flapping Wing Micro Aerial Vehicles With Parameter Uncertainties and Actuator Saturation Open
Robust control is essential to the flapping wing micro aerial vehicle (FWMAV) due to model uncertainties, environmental or self changes during flight, such as the change of drag coefficient caused by airflow and the asymmetric effect cause…
View article: LPV Modeling and Robust Sampled-Data H∞ Control of a Tailless Flapping Wing Micro Aerial Vehicle With Parameter Uncertainties
LPV Modeling and Robust Sampled-Data H∞ Control of a Tailless Flapping Wing Micro Aerial Vehicle With Parameter Uncertainties Open
In order to achieve improved tracking performance, this paper considers the distinct features of tailless flapping wing micro air vehicles (FWMAVs), and proposes a robust $\bm{H_{\infty}}$ controller. A linear parameter Varying (LPV) model…
View article: Adaptive Control of Flapping-Wing Micro Aerial Vehicle with Coupled Dynamics and Unknown Model Parameters
Adaptive Control of Flapping-Wing Micro Aerial Vehicle with Coupled Dynamics and Unknown Model Parameters Open
With the complex aerodynamics, the accurate system model of the flapping-wing micro aerial vehicle required for precise control is hard to acquire, meanwhile, due to the unique control strategy, the coupling between the actuators also brin…
View article: More Detailed Disturbance Measurement and Active Disturbance Rejection Altitude Control for a Flapping Wing Robot Under Internal and External Disturbances
More Detailed Disturbance Measurement and Active Disturbance Rejection Altitude Control for a Flapping Wing Robot Under Internal and External Disturbances Open
With the goal of designing a biologically inspired robot that can hold a stable hover under internal and external disturbances. We designed a tailless Flapping-wing Micro Aerial Vehicle (FMAV) with onboard 3D velocity perception. In this w…
View article: Piezoelectric, ferroelectric and pyroelectric properties of (100 − x)Pb(Mg1/3Nb2/3)O3 − xPbTiO<sub>3</sub> ceramics
Piezoelectric, ferroelectric and pyroelectric properties of (100 − x)Pb(Mg1/3Nb2/3)O3 − xPbTiO<sub>3</sub> ceramics Open
A series of (100[Formula: see text]Pb(Mg[Formula: see text]Nb[Formula: see text]O[Formula: see text]PbTiO 3 (PMN[Formula: see text]PT, [Formula: see text]= 24, 25, 26) ceramics were prepared by solid-state reaction technique using MgNb 2 O…