41 Result(s)
within
Characterization and Evaluation of Materials
JI ZHOU
Article
-
Article
Ensemble learning models to predict the compressive strength of geopolymer concrete: a comparative study for geopolymer composition design
Currently, single machine learning models are mostly used for predicting the compressive strength of geopolymer concrete, but the use of single models has limitations. This study proposes the use of an integra...
-
Article
Enhanced Electrochemical Properties of N-Doped Carbon Nanofibers by Co9S8 Nanoparticles Derived from ZIF-67
ZIF-67 has been widely utilized for the preparation of Co-based catalysts, N-doped porous carbon, and a variety of energy storage nanomaterials. In this paper, ultrafine Co9S8 nanoparticles derived from ZIF-67 ha...
-
Article
Open AccessImprovement in mechanical properties in AlN-h-BN composites with high thermal conductivity
It is possible to improve the machinability of aluminum nitride-hexagonal boron nitride (AlN-h-BN) ceramics while maintaining high strength and high thermal conductivity. The composite ceramics with 0–30 wt% B...
-
Article
Computational investigation of sensing properties of Ca-doped zinc oxide nanotube toward formaldehyde
Following an experimental work, we employed density functionals B3LYP, B97D, CAM-B3LYP, BMK, and M06-HF to study the impact of Ca-do** on a ZnO nanotube (ZnONT) sensing performance to the formaldehyde gas. T...
-
Article
Facile microwave-assisted synthesis of Ti3C2 MXene quantum dots for ratiometric fluorescence detection of hypochlorite
A dual-channel “naked-eye” colorimetric and ratio fluorescent probe has been developed based on titanium carbide quantum dots for the detection of curcumin and hypochlorite (ClO−). The fluorescence emission of T...
-
Article
ε-Poly-L-lysine-protected Ti3C2 MXene quantum dots with high quantum yield for fluorometric determination of cytochrome c and trypsin
Titanium carbide quantum dots functionalized with ε-poly-L-lysine (PLL) were synthesized by sonication cutting and hydrothermal synthesis. The deprotonated Ti3C2 MXene quantum dots (Ti3C2 MQDs) exhibit excitation...
-
Article
Open AccessHigh-performance bifunctional polarization switch chiral metamaterials by inverse design method
Multifunctional polarization controlling plays an important role in modern photonics, but their designs toward broad bandwidths and high efficiencies are still rather challenging. Here, by applying the inverse...
-
Article
Low-PAPR interleaved single-carrier FDM scheme for optical wireless communications
As a potential complementary access technology for the 5G wireless systems, optical wireless communication (OWC) gains extensive attention for decades owing to its numerous advantages of broad license-free spe...
-
Article
Experimental comparison of 28 Gb/s NRZ and EDB schemes for faster-than-Nyquist PON
In this paper, we experimentally demonstrate 28 Gb/s non-return-to-zero (NRZ) and electrical duo-binary (EDB) schemes over 25-km standard single-mode fiber transmission for faster-than-Nyquist passive optical ...
-
Article
An improved diversity combining receiver for layered ACO-FOFDM in IM/DD systems
In this paper, an improved receiver based on diversity combining is proposed to improve the bit error rate (BER) performance of layered asymmetrically clipped optical fast orthogonal frequency division multipl...
-
Article
Enhanced thermal expansion by micro-displacement amplifying mechanical metamaterial
It is important to achieve materials with large coefficient of thermal expansion in science and engineering applications. In this paper, we propose an experimentally-validated metamaterial approach to amplify ...
-
Article
A Comparison of Texture Development in an Experimental and Industrial Tertiary Oxide Scale in a Hot Strip Mill
Electron backscatter diffraction (EBSD) has been used to investigate the microstructure and texture-based features of an industrial tertiary oxide scale formed on a micro-alloyed low-carbon steel from a hot st...
-
Article
Low-temperature solution-processed alumina dielectric films for low-voltage organic thin film transistors
We studied low-temperature alumina (AlOx) gate dielectrics by a simple spin-coating of home-made aluminum acetate hydroxide precursor (Al(OH)(C2H3O2)2) for low-voltage organic thin-film transistors (OTFTs). To im...
-
Article
Enhanced performances of organic thin film transistors by dual interfacial modification of dielectric layer
In this paper, we demonstrate an effective method for the performance improvement of organic thin film transistors (OTFTs), in which the SiO2 dielectric layer was dually modified with polystyrene (PS) and hexame...
-
Article
Artificial isotropic magnetism and negative refraction of metamaterial consisting of dielectric spherical shells
We present a detailed study on the artificial magnetism of high-permittivity dielectric spherical shell array and the negative refraction behavior of the composite consisting of dielectric spherical shells and...
-
Article
Structure and Manufacturing Process of MnO2 Counter Electrode in Niobium Suboxide Capacitors
The influence of iterative heat treatment of impregnated aqueous Mn(NO3)2 solution on the microstructure of the produced MnO2 has been investigated in the fabrication process for niobium suboxide capacitors. We s...
-
Article
Resistive switching in a negative temperature coefficient metal oxide memristive one-port
A current-controlled memristive one-port was constructed from cobalt monoxide (CoO) using a traditional solid reaction method at 1150 °C in argon atmosphere. Hysteretic current–voltage (I–V) characteristics and r...
-
Article
Open AccessLow-fired Y-type hexagonal ferrite for hyper frequency applications
Y-type hexagonal ferrite with planar magnetocrystalline anisotropy has ultrahigh cut-off frequency up to GHz and excellent magnetic properties in hyper frequency range, so that is regarded as the most suitable...
-
Article
Open AccessTowards rational design of low-temperature co-fired ceramic (LTCC) materials
High performance low temperature co-fired ceramic (LTCC) dielectrics is highly desired for next generation information technology. The rational design is a key issue for the development of new LTCC materials. ...
-
Article
Phase structure and vibrational spectra of rare-earth-oxide ceramics of Dy2(1−x)Tm2x O3
Rare-earth-sesquioxide ceramics have been found to possess potential applications in solid-state lasers due to their excellent physical and chemical properties as well as low cost. In this paper, composite pow...
