Liu Bo

• Tianjin University

Emerging contaminants are considered as some substances of actual or potential threat to human health or environment, which include pharmaceutical, personal care products, endocrine disruptors, nanoparticles, antibiotic resistance genes and chemicals used in packaging products, etc. How to treat these emerging pollutants in water bodies with green,...

gamma-CuI crystal was prepared by using slow solvent evaporation method. The optical transmission spectrum reveals that the crystal is transparent with band gap of 2.96 eV. Two near -band -edge emission peaks are located at 410 nm, 430 nm, and an iodine related defect emission band near 720 nm of the crystal appear under UV excitation. The emission...

Emerging contaminants are considered as some substances of actual or potential threat to human health or environment, which include endocrine disruptors, pharmaceutical, personal care products, nanoparticles, antibiotic resistance genes and chemicals used in packaging products, etc. The disposal and treatment of emerging contaminants has become a k...

LuTaO4 is a kind of novel material for radiation detectors, but using it to prepare high-quality and transparent thin film is of great challenges. In our previous study, high-quality LuTaO4 thin film was prepared with thickness of single film only about 60 nm, but multilayers film easy to crack. In this study, to ensure no cracking and high transpa...

LuTaO4 is a kind of novel material for radiation detectors, but using it to prepare high-quality and transparent thin film is of great challenges. In our previous study, high-quality LuTaO4 thin film was prepared with thickness of single film only about 60 nm, but multilayers film easy to crack. In this study, to ensure no cracking and high transpa...

Emerging contaminants are considered as some substances of actual or potential threat to human health or environment, which include endocrine disruptors, pharmaceutical, personal care products, nanoparticles, antibiotic resistance genes and chemicals used in packaging products, etc. The disposal and treatment of emerging contaminants has become a k...

InAlN/GaN heterostructures were grown on sapphire substrates by low-pressure metal organic chemical vapor deposition. The influences of NH3 flux and growth temperature on the In composition and morphologies of the InAlN were investigated by X-ray diffraction and atomic force microscopy. It's found that the In composition increases quickly with NH3...

Urban tourism competitiveness is divided into four factors by starting from the perspective of competitive factor based on the grasp of urban tourism competitiveness, including the tourism market competitiveness, tourism factor competitiveness, urban environment competitiveness and urban opening degree competitiveness. On that basis, urban competit...

The evaluation of environmental cost for coal resource development is the foundation of the environmental impact compensation for coal resource development. The evaluation index system of the environmental cost for the coal resource development was constructed from three aspects, including the impact on natural environment, impact on ecological env...

The uncertain factors influencing the whole schedule of construction supply chain and the uncertain factors of the enterprises in influencing the schedule in each panel point are analyzed. Based on the analysis of influencing factors made by the ISM method, two aspects are generalized: The extent of the cooperation consciousness of the strategic pa...

This paper has proposed a new group synchronization protocol for nonlinear dynamical complex networks whose information interaction exists among different groups via pinning control schemes. By constructing an effective Lyapunov function, we have proved that all nodes in each group can converge to its own synchronous state respectively. Finally, so...

Tourist industry plays a greater and greater role in the economic development in China. In order to learn about the comprehensive strength of the listed tourism company, the principal component analysis has been applied to carry out the comprehensive performance assessment for six listed tourism company, which will be favorable for their improvemen...

An Ni/Au Schottky contact on an AlGaN/GaN heterostructure has been prepared. By using the peak-conductance model, the threshold voltage and the series resistance of the AlGaN/GaN diode are simultaneously extracted from the conductance—voltage (G—V) curve and found to be in good agreement with the ones obtained by using the capacitance—voltage (C—V)...

Using measured capacitance—voltage curves and current—voltage characteristics for the AlGaN/AlN/GaN heterostructure field-effect transistors with different gate lengths and drain-to-source distances, the influence of drain bias on the electron mobility is investigated. It is found that below the knee voltage the longitudinal optical (LO) phonon sca...

The effect of an initially grown high-temperature AlN buffer (HT-AlN) layer's thickness on the quality of an AlN epilayer grown on sapphire substrate by metalorganic chemical vapor deposition (MOCVD) in a two-step growth process is investigated. The characteristics of AlN epilayers are analyzed by using triple-axis crystal X-ray diffraction (XRD) a...

We report the DC and RF performance of InAlN/GaN high-electron mobility transistors with AlGaN back barrier grown on SiC substrates. These presented results confirm the high performance that is reachable by InAlN-based technology. The InAlN/GaN HEMT sample showed a high 2DEG mobility of 1550 cm2/(Vs) at a 2DEG density of 1.7 × 1013 cm−2. DC and RF...

We use first-principles calculation with pseudo-potential and plane wave method to study the electronic structure of LuI3. Exchange and correlation are treated in the local density approximation based on the density functional theory. The results show that the narrow bands with a width of about 0.2 eV near -4.4 eV are dominated by the 4f bands of L...

We investigate the emission properties of CuI film scintillators and the effect of distributed Bragg reflectors. The free-exciton emission and the donor-acceptor pair emission from the CuI thin film with the peak wavelengths of 410 nm and 420 nm are observed. However, for the two emission bands, the distributed Bragg reflector reflection results in...

This paper investigates controllability of discrete-time multi-agent systems with multiple leaders on fixed networks. The leaders are particular agents playing a part in external inputs to steer other member agents. The followers can arrive at any predetermined configuration by regulating the behaviors of the leaders. Some sufficient and necessary...

Organophilic montmorillonite (OMMT) was prepared via ionic exchange of the cetyl trimethyl ammonium bromide (CTAB). OMMT was compounded with natural rubber (NR) by mechanical mixing method. The structures and performances were characterized by scanning electron microscope (SEM), infrared spectroscopy (IR), thermogravimetric analysis (TGA) and X-ray...

A hard transparent titania/silicone hybrid film with tunable refractive index was studied. The titanate coupling agent, Isopropyl tri(dioctylpyrophosphate) titanate(TTPO) and the silane coupling agent, trimethoxysilylpropylmethacrylate (TMSPM), were applied with tetrabutoxytitanate (TBOT) via sol-gel process to obtain a transparent stabilized titan...

We report an enhancement-mode InAlN/GaN MISHEMT with a low gate leakage current by a thermal oxidation technique under gate. The off-state source-drain current density is as low as ∼10−7 A/mm at VGS = 0 V and VDS = 5 V. The threshold voltage is measured to be +0.8 V by linear extrapolation from the transfer characteristics. The E-mode device exhibi...

Electrical stress experiments under different bias configurations for AlGaN/GaN high electron mobility transistors were performed and analyzed. The electric field applied was found to be the extrinsic cause for the device instability, while the traps were recognized as the main intrinsic factor. The effect of the traps on the device degradation was...

In this paper, we consider the problem of the strategy adopted by individuals in the vertices of the network for evolution on the lattice of the Prisoner's Dilemma Game. Based on the WSLS strategy (Win-Stay-Lose-Shift), we propose a new strategy which can be reflect the effect of other individuals for the evolution game. As the imitating strategy r...

This paper establishes a more general continuous time swarm model with N-member. It takes the time delay and disturbances into account. We proved that the swarm members will converge and form a cohesive cluster around the center in a finite time in the presence of communication delays and disturbances. Moreover, we consider the multi-modal gaussian...

We investigate second-order consensus of multi-agent systems with undirected topology and two kinds of time-varying delays. By introducing adaptive strategies to both the coupling strengths and the feedback gains of the position and velocity, we propose a decentralized adaptive consensus algorithm for multi-agent systems. For the derivable and boun...

We use first-principles calculation with pseudo-potential and plane wave method to study the bulk meduli, electronic structures and optical properties of copper halides CuX (X = Cl, Br, I). A comparison of the calculation results with the available experimental results show that it is more suitable using the generalized gradient approximation to st...

A lattice-matched InAlN/GaN heterostructure was grown on sapphire substrate by using low-pressure metal organic chemical vapor deposition (MOCVD), and Hall effect measurements shown that the sheet charge density and electron mobility were 2.6×1013 cm−3 and 1210cm2/V•s, respectively. Large gate periphery (2.5mm) high electron mobility transistors (H...

We reported on the fabrication and characterization of AlGaN metal-semiconductor-metal (MSM) photodetectors (PDs). AlGaN epitaxial material with an Al content of 0.6 were grown on sapphire substrates by metalorganic chemical vapor deposition (MOCVD). Schottky contacts were made with Ni/Pt/Au by the way of standard lift-off technique. We measured th...

In this paper, a new type of fiber Bragg grating (FBG) sensor matching demodulation system based on piezoelectric ceramic (PZT) is designed. Through the micro displacement of phase-sensitive detector (PSD)'s displacement feedback signal counterproductive in PZT, a closed-loop control system can be formed, with the function of driving, detecting and...

This paper introduces a method of image encryption algorithm which was improved. Chaotic sequence is generated by the Logistic chaos mapping. Image encryption is realized by gray value of substitutes and pixel position scrambling. Encryption algorithm and decryption algorithm use Matlab to simulate image. The results proved the feasibility of the p...

A frequency stabilization control system based on confocal F-P interferometer for semiconductor lasers is introduced to realize a stable frequency output. The system consists of the MCU MSP430, F-P confocal interferometer, current control and temperature control system. Giving an audio scanning voltage to the interferometer can make the laser power...

Based on the “convexly separable” concept, we present a solid geometric theory and a new general framework to design piecewise linear classifiers for two arbitrarily complicated nonintersecting classes by using a “multiconlitron,” which is a union of multiple conlitrons that comprise a set of hyperplanes or linear functions surrounding a convex reg...

Nanopowders of indium-doped tin dioxide (ITO) was prepared by a new sol-gel combustion hybrid method using acetylene black as a fuel. Nanosized indium-doped tin dioxide/waterborne polyurethane (WPU) nanocomposite materials were prepared by the blending method with self-made nanosized indium-doped tin dioxide slurry and waterborne polyurethane synth...

WO(3)-Polymer hybrid sol was prepared from self-prepared 9-Tungstophosphate acid based on polyvinylpyrrolidone (PVP) by alcoholysis at a certain temperature. Coatings on glass substrates were obtained by spraying technique and subsequently dried at room temperature. The transparent WO(3)-Polymer coatings could be transformed to blue after exposed t...

We have performed the first-principles linear response calculations of the lattice dynamics, thermal equation of state and thermodynamical properties of hcp Os metal by using the plane-wave pseudopotential method. The thermodynamical properties are deduced from the calculated Helmholtz free energy by taking into account the electronic contribution...

The electronic structure of M’ type GdTaO4 is studied by first-principle pseudopotential calculation within the frame of density-functional theory. The calculated band structure of M’-GdTaO4 revealed that the top of the valence band is dominated by O-2p and the bottom of the conduction band is dominated by e orbits of Ta-5d. The spin-up and spin-do...

A temperature-insensitive displacement sensor based on high-birefringence photonic crystal fiber loop mirror (Hi-Bi PCFLM) is proposed. Through the measurement of transmission peak wavelength of the Hi-Bi PCFLM, this displacement sensor quantifies the free end displacement of a uniform-strength cantilever beam, on which part of Hi-Bi PCF is pasted....

Efficient algorithms for compressing three-dimensional (3D) triangle meshes have been widely developed in recent years, but most of them are designed to deal with manifold meshes. A progressive geometry-driven 3D triangle meshes algorithm is proposed in this work which can be easily extended to non-manifold mesh compression and polygon mesh compres...

A novel fiber Bragg grating (FBG) sensing multiplexing system based on the combination of InGaAs spectrometer and Fabry–Perot (F-P) filter (InGaAs/F-P) is proposed. The multiplexing system only demodulates FBG sensors whose peak wavelengths are shifting. The demodulation can be sequenced according to each sensor's priority, latency time and wavelen...

In this article, we reported a polarization orthogonal single-longitudinal-mode distributed Bragg reflector (DBR) fiber laser. The laser operated robustly in single longitudinal mode and dual polarizations with frequency difference of 976.93 MHz. This laser has simple structure as well as frequency adjustable. It can be used in a wide range of comm...

Nanosized ZnAl(2)O(4) particles with average particle size of about 40 nm were synthesized by sonicating an aqueous solution of Al(NO(3))(3)center dot 9H(2)O, Zn(NO(3))(2)center dot 6H(2)O and precipitant, and sequently heating the resulting precipitate at 850 degrees C for 5 h. The structure of these nanosized ZnAl(2)O(4) particles was characteriz...

Nanosized MnFe2O4 was synthesized with the aid of ultrasound radiation by a precursor approach. Sonicating an aqueous solution of MnCl2 center dot 4H(2)O, FeCl3 center dot 6H(2)O and urea yielded a precursor which produced nanosized MnFe2O4 particles with average particles size of 35 nm after heating at 950 degrees C for 15 h. The nanosized MnFe2O4...

Nanosized CdFe2O4 was synthesized by an ultrasonic precipitation method. Sonicating an aqueous solution of Cd(NO3)(2).4H(2)O, Fe(NO3)(3)center dot 9H(2)O and precipitant yielded a precipitation which produced nanosized CdFe2O4 particles with average particle size of 56 mn after heating at 850 degrees C for 5 h. The nanosized CdFe2O4 particles have...

Bragg gratings are straightforwardly written into a 10-ring photonic crystal fibre (PCF) with a highly Ge3+ -doped core by means of a 193 nm ArF excimer laser. The grating inscription efficiency is improved, due to enhanced photosensitivity and the large overlap between the fundamental mode and the photosensitive core. The exposure duration only la...

In this paper a novel and intuitive method for the interactive deformation of 3D meshes is proposed. This method is based on skeleton. After a region of the model to be deformed is selected and several reference points are specified, a skeleton is created implicitly and automatically through the reference points and the screen. Then the vertices in...

In this paper, we analyzed the frequency splitting phenomena when distributed Bragg reflector (DBR) fiber laser was influenced by lateral pressure. We gave the relationship of the frequency interval and the lateral pressure. This frequency splitting phenomena is based on Intracavity birefringent effects which are modulated by lateral pressure. So,...

An intra-cavity coherent coupling Michelson Er-doped fibre (EDF) laser (MCEDFL) is proposed and demonstrated. Characteristics of the MCEDFL are investigated. It is found that the MCEDFL with a polarizer can be coherent combined effectively. By the experiment based on fibre Bragg gratings (FBGs) with different reflectivity, we find that the reflecti...

In this paper, we propose a new mesh editing method worked in the dual domain for ROI (region of interest). This method has intuitive user interface and efficient reconstruction process. The mesh detail is represented by dual Laplacian, and the reconstructed mesh is obtained by solving a quadratic minimization problem which preserves the mesh detai...

A novel blind watermarking method for the 3D mesh model is proposed. This method is based on the geometry image which is created by the parameterization and sampling of the model. The geometry image except the boundary is partitioned into several sub-images of equal size. Every sub-image is normalized and decomposed with two-dimensional Haar wavele...

In this paper, we present a technique for multi-resolution meshes deformation based on pyramid coordinates. Pyramid coordinates are rotation invariant, and can achieve low distortion editing for large deformations. Their drawback is that the reconstruction process is nonlinear and time consuming especially for large meshes. In order to decrease the...

In this paper, we propose a new energy-minimizing mesh parameterization method, which linearly combines two new energies E_Q and E_M. It not only avoids triangles overlap in the parameter domain, but also is invariant under rotation, translation and scale transformations. We first parameterize the original 3D mesh to the paramet...

A fiber ring down with a weak long period grating for temperature and strain sensing is proposed and demonstrated. The sensing devices consist of two matched fiber Bragg gratings, a section of single mode fiber, a weak long period grating, a pulsed laser source and a photodiode. The LPG incorporated in fiber ring cavity is used as sensing element...

Although a number of normalized edit distances presented so far may offer good performance in some applications, none of them can be regarded as a genuine metric between strings because they do not satisfy the triangle inequality. Given two strings X and Y over a finite alphabet, this paper defines a new normalized edit distance between X and Y as...

Fibre Bragg gratings (FBGs) are inscribed in homemade microstructured fibres by the standard phase mask method. Enhanced couplings between the forward fundamental mode and backward cladding modes are obtained. The mode coupling and spectral characteristics are investigated experimentally. The cladding mode resonances can be affected by filling acti...

Although a number of normalized edit distances presented so far may offer good performance in some applications, none of them can be regarded as a genuine metric between strings because they do not satisfy the triangle inequality. Given two strings X and Y over a finite alphabet, this paper defines a new normalized edit distance between X and Y as...

A novel direct cut-and-paste editing method over 3D triangular meshes is proposed in this paper. The source feature mesh is transferred to the position where it is to be pasted through the corresponding planes. The planes are created using the least squares approximation. To decrease the distortion of pasting region, the local mesh representation i...

In order to describe mesh bit-streams which can be adapted to the heterogeneity of network bandwidth and terminals graphics capabilities, the concepts of quality scalability and resolution scalability are introduced. A triangle mesh compression scheme based on wavelet transform is proposed to generate bit-streams with both scalabilities. Each subba...

We report a novel method for measuring photo-induced birefringence of photosensitive fibres based on a fibre loop. The method is simple and is only slightly affected by the surroundings. The experimental results show that the photo-inducing normalized birefringence of the photosensitive fibre is multi-decaying-exponentially proportional to the expo...

The transient electric fields caused by contact discharge in the IEC61000-4-2 standard set-up are measured using a broadband loaded V-antenna. The results show that: the spectrum of the radiated fields are not influenced by discharge voltage and polarity, but the longer distance away the discharge point is, the shorter bandwidth of spectrum is. The...

Making use of the two modified finite-difference time-domain (FDTD) methods, that is, ADI-FDTD and R-FDTD, we propose a new time domain method in this paper. The method is established from Maxwell curl and divergence equations. It inherits the advantages of both former methods, i.e., not only eliminating the restraint of the Courant-Friedrich-Levy...

As a recently developed technique for FDTD algorithm, R-FDTD leads to a memory-efficient formulation, with a direct memory reduction of 33% in the storage of the fields compared to traditional FDTD algorithm. However, R-FDTD is complicated to deal with the regions including conductors and source. In this paper, a method of subregion is used to get...