During dental implantation, if the temperature within bone tissue exceeds a critical value, thermal necrosis of cells may take place, inhibiting osseointegration. In contrast to conventional implant surgery, surgery guided by surgical template is safer and more efficient technique; however, field difficult control, because guide blocks irrigation water. The purpose this study was investigate distribution in drilling site when preparing for placement with guide, derive suggestions clinical...

Organic light-emitting diodes (OLEDs) with multiple-quantum-well structures, which consist of copper phthalocyanine and N,N′-bis-(1-naphthyl)-N,N′-diphenyl-1,1′ biphenyl 4, 4′-diamine, have been fabricated. The effect the MQW structure upon performance OLEDs tris(8-hydroxyquinoline) aluminum as emitting material has investigated. Compared luminous efficiency conventional diode number 0, that 4 sharply increased up to 10.8 cd/A. Such an improvement in device was attributed improved...

A novel diaphragm-based miniature optical fiber pressure sensor has been shown to work at temperatures up 700/spl deg/C with a sensitivity of 2.93 nm/psi and resolution 0.01 psi (68.9 Pa). passive temperature compensation scheme was used reduce the dependence 0.0076 psi//spl (52.4 Pa//spl deg/C). The exhibited linear response in available testing range from 0 200 (1.38 MPa), being composed entirely fused silica, sensor's structure is very reliable, corrosion resistant, immune electromagnetic...

Efficient red-light emission is obtained with a novel, non-doped, naphtho[2,3-c][1,2,5]thiadiazole (NTD) derivative (see figure). This material does not contain strong donor groups so dipole–dipole interactions and inter-molecular π–π stacking can be substantially suppressed. Non-doped pure-red OLEDs high efficiency have been prepared indicating that this has great potential in the fabrication of high-performance red OLEDs.

Acoustic emission technology has been applied to many fields for years. However, the conventional piezoelectric acoustic sensors cannot be used in extreme environments, such as those with heavy electromagnetic interference, high pressure, or strong corrosion. In this paper, a novel fiber-optic ring sensor is proposed. The exhibits sensitivity, anti-electromagnetic and corrosion resistance. First, principle of introduced. Different from other fiber sensors, includes both sensing skeleton...

Detonation velocity is an important parameter for explosive, and it crucial many fields such as dynamic chemistry burn models, detonation propagation prediction, explosive performance estimation, so on. Dual-channel measurement method system are described. The CFBG sensors pasted both on the surface in center of cylinder. length measured via hot-tip probe method. light intensity reflected from attached to transformed voltage, voltage-time then with oscilloscope. According five experiments...

In a normal environment on Earth, there are several methods for obtaining the deflection curve of satellite wing frame, such as laser method and electronic resistance strain gauge method. However, none them suitable outer space environment. Therefore, developing reliable sensing solution high noise, vacuum, extremely low-temperature may be very challenging task. this paper, new fiber Bragg grating (FBG) sensors is proposed to meet harsh need. First, hundreds FBG pasted onto surface frame...

In this experiment, we investigated the effects of different reactions on growth process and morphology h-MoO3 α-MoO3, their optical properties photocatalytic activities were also investigated. Orthogonal experiments designed to investigate four influencing factors, namely amount ammonium molybdate tetrahydrate (AHM), type acid, reaction temperature holding time, by a microwave hydrothermal method. The phase analyzed using advanced physicochemical techniques. XRD results showed that samples...

With the increase of space activities, safety detection equipment in supercold environment becomes more and important. However, liquid hydrogen is an unsolved worldwide problem. This paper presents a new method to detect acoustic emission (AE) signals environment, which can be used confirm reliability working hydrogen. First, principle mandrel-based fiber-optic ring (MBFOR) AE sensor corresponding demodulation are introduced. Second, effects physical parameters such as length sensing fiber,...

To achieve functional and esthetic results, implants must be placed accurately; however, little information is available regarding the effect of surgical templates on accuracy implant placement. Thus, aim this study was to measure deviation between actual planned positions, determine caused by template.Jaws from 16 patients were scanned using cone beam computed tomography (CBCT). For our study, 53 in a virtual 3D environment, which 35 inserted mandible 18 maxilla. A stereolithographic (SLA)...

Fault diagnosis of the rolling bearing means a lot for property and life safety. In this paper Fiber Bragg Grating (FBG) vibration sensor resonance demodulation technology are used in fault bearing. Traditionally, signals measured by resistance strain gauge, accelerometer, etc. But those traditional electronic sensors usually influenced industry electromagnetic noise. FBG is totally different. It has advantages such as small volume, light weight, easy connection so on. And high noise nothing...

The velocity of acoustic emission (AE) wave at super-low temperatures is important in many fields, such as aerospace, aviation, nuclear power, superconductors, and military industry. Here, we propose a new fiber-optic AE theory, sensor equipment to measure the liquid nitrogen. In this transmitted into an optical phase inside fiber, demodulated. A ring are built test theory. Finally, experiments performed For first time, nitrogen measured, which 870.63 ± 5.35 m/s. This scheme could provide...

Fiber Bragg grating (FBG) acoustic emission (AE) sensors have been used in many applications. In this paper, based on an FBG AE sensor, the sensing principle of interaction between wave and sensor is introduced. Then, directionality surface a thin polymer-bonded explosive (PBX) material studied. Finally, time coefficient location method proposed to correct detected by thereby improving accuracy experiments.

An axial superresolution diffraction theory is developed in a two-photon microfabrication system. This method can improve the of A theoretical analysis photosensitive resin discussed based on exciting power and concentration free radical theory. Simulated results verify show that it provide insight into

The short wavelength infrared (SWIR) band near 1.0-3.0μm plays an important role in many applications such as weather forecast, earth environmental or resource observation, low light level systems and astronomical observation. It is well known that InGaAs detectors can shift the cutoff from 1.7μm to 2.5μm with higher fraction of indium ternary In_XGa_1-XAs material grown on InP, which results defects poorer device characteristics due lattice mismatch. Dark...

Fiber Bragg grating acoustic emission sensors have been used in many applications. In this paper, based on four fiber sensors, an location experiment is carried out the surface of a cylindrical polymer-bonded explosive specimen. Due to difference strain sensitivity different directions, traditional time-difference method not fit for sensors. A 4-layer dense neural network together with Bayesian regularization calculate coordinates wave source. The experimental results show that suitable

The navigation and positioning system is the key technology for robot in unattended substation to inspect equipments. Therefore, author makes up hardware system, which consists of fiber optic-gyro (FOG), odometric, accelerometer, DGPS receiver computer. Also, software this integrated orientation designed based on differential GPS (DGPS) Dead Reckoning (DR) principle, adopts method self-north-seeker switching-integrated navigation. simple trustiness, meanwhile, has good practicability....

A heatsink is a large experimental device which used to simulate the outer space environment. In this paper, Raman-based distributed temperature sensor was for real-time and continuous monitoring, special sensing method system have been proposed. This takes advantage of three calibration parameters ( Δ α , γ C ) calculate temperature. These are related attenuation optical fiber, Raman translation, difference optoelectronic conversion, respectively. Optical time domain reflectometry location....