Polymers with both high refractive index and excellent transmittance are in demand for use optoelectronic devices. Polyarylates regarded as one of the most promising categories optical materials. However, there higher requirements polyarylates terms refraction a degree light reansmission.In this study, series novel were designed synthesized by nucleophilic reaction using bisphenol pendant cardo structure acid chloride from bio-based diacid (2,5-thiophenedicarboxylic acid). These displayed...

Abstract A dynamic model of the nonlinear torsional vibration in main drive system a rolling mill was established, accounting for friction torque obtained from lubrication effect at interface and parameter excitation caused by inclination universal joint shaft. The response equation under combined action parame-ter external solved using multi-scale method, determining am-plitude-frequency characteristics vibration. influence structural parameters, disturbances, on behavior analyzed. results...

A high sensitivity strain sensor based on micro-helix micro taper long period fiber grating (MH-MTLPFG) is proposed and experimentally investigated. The MH-MTLPFG fabricated by periodically tapering helix structure a standard single-mode with arc discharge technology. arrangement of makes the have sensing sensitivity. experiment results show that up to −3.478 pm/ <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math...

A high accuracy blade manufacture variation decomposition method was proposed to decompose the variations of compressor blades systematic and non-systematic variation, which could help clearly quantify statistical characteristics effect on aerodynamic performance guide modeling in geometric uncertainty quantification robust design studies. By conducting with 100 newly manufactured a high-pressure compressor, it found that be modeled by using seven representative geometry parameters well mean...

Abstract This paper presents the research results on rheological behavior of Polyamide 6 (PA6) film during uniaxial stretching. The creep and relaxation tests PA6 films were conducted dynamic mechanical analysis (DMA) tester under tensile conditions. And analyzed different stress temperature, strain. With increase temperature or stress, was enhanced. strain, showed an enhanced tendency. Fractional-order Maxwell model, fractional-order Kelvin model linear body used to fit analyze experimental...

Aiming at the problem of target location in process approaching non-cooperative targets, a algorithm based on double-line-of-sight cooperative angle-only measurement is proposed, and accuracy can be improved by optimizing proximity configuration. Firstly, two-spacecraft scheme using only line-of-sight extended Kalman filter designed. Then, introducing normal distribution crossover operator, variable mutation index simulated catastrophe, NSGA-Ⅱ applied to optimization Finally, numerical...

The gravity tends to coincide with the Earth’s rotation vector in polar region, degrading coarse alignment azimuth of strapdown inertial navigation system (SINS) a large misalignment. Under misalignment, linear error model inevitably renders unacceptable theoretical errors integrated alignment. In addition, region challenges such sensors as star sensor celestial navigation, which fails provide high-precision attitude reference for Therefore, allusion misalignment mentioned above based on...

In the dynamic point-to-point communication, to track and aim at antenna fast accurately is guarantee of high quality communication signal. order solve problem alignment, we used least square method (LSM) fit optimal level signal value (LSV) point which based on coordinate coarse tracking alignment matrix scanning strategy find LSV in this paper. Antenna driven by two-dimensional turntable (azimuth elevation angle (AE)): decomposed into two independent one-dimensional turntables, AE...

As a key component in the engine system, silicon nitride igniter's stable and reliable operation is necessary condition for proper functioning of system. However, an online high temperature sensor igniter inside absent. This paper presents demonstrates novel in-fiber integrated array with spatial resolution field measurement on igniter. The series weak reflectors written by femtosecond laser core single-mode fiber. reflectivity each reflector can be controlled from 10 <sup...

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The traditional polar rapid transfer alignment (RTA) are generally modeled under small angle misalignment assumption. Those linearized and nonlinear RTA error models presented, so far, not capable of accurately representing the properties system where all-orientation large attitude errors happen between master slave strap-down inertial navigation systems (SINS). It cannot satisfy accuracy for SINS initialization has a singularity in computation. In this article, quaternion grid frame was...

The polar rapid transfer alignment (RTA) is preferred to initialize the moving base. heading error under grid frame accumulates with time, and aid navigation required calibrate strapdown inertial system (SINS). However, Arctic has a complex environment where auxiliary devices, customarily used in low medium latitudes, cannot operate appropriately regions. SINS attitude reference may contain errors contaminate measurement quality of RTA, causing failure. Thus,we introducedpolarized-light...

Redundant manipulators are suitable for working in narrow and complex environments due to their flexibility. However, a large number of joints long slender links make it hard obtain the accurate end‐effector pose redundant manipulator directly through encoders. In this paper, estimation method is proposed with fusion vision sensors, inertial Firstly, according complementary characteristics each measurement unit original data corrected enhanced. Furthermore, an improved Kalman filter (KF)...

The marine navigation system is the precondition for all kinds of military and civilian vehicles to reach polar regions sail safely. However, special environment region reduces performance system, which even cannot be applied. In order fundamentally understand application systems in regions. On basis systematically expounding development history vehicle applied We propose comprehensively analyze impact on main four aspects: earth kinematics, geophysical field, geographic environment. And we...

The satellite navigation and the celestial navigation, as traditional auxiliary sources cannot totally provide available continuous information in polar regions, especially under conditions such magnetic storms day. Consequently, it leads to difficulties integrated alignment. In this paper, a new alignment algorithm is proposed based on azimuth velocity, which are supplied by improved polarized light (PL) Doppler velocity log (DVL) respectively. Initially, PL for region existing transverse...

The Tri-axial high temperature superconducting (HTS) cable usually subjects to the impact of fault currents in power system. During fault, a large amount Joule heat is generated, which may be damage cable. In this paper, an analysis model electromagnetic thermal transient characteristics 10 kV/1 kA built. HTS are analyzed under current 15 rms lasting 0.14 s, and current, resistance obtained. maximum 153.1 K current. Meanwhile, safe operating range 25 results will provide theoretical basis...

Banking systems play a crucial role in any economy, supporting financial intermediation and facilitating economic growth. As globalization continues to reshape the world, comprehending similarities distinctions between these banking becomes increasingly crucial. The Chinese system operates within centralized governance state control, with state-owned banks dominating. In contrast, US is characterized by more decentralized approach mix of privately owned banks, including substantial number...

Alignment between preoperative images (high-resolution magnetic resonance imaging, angiography) and intraoperative medical (digital subtraction is currently required in neurointerventional surgery. Treating a lesion usually guided by 2D DSA silhouette image. increase procedure time radiation exposure due to the lack of anatomical information, but information from MRA can be utilized compensate for this order improve efficiency. In paper, we abstract into problem relative pose correspondence...