Flower-like g-C 3 N 4 /CuCo 2 O structures have been successfully established by decorating on CuCo nanostructures, demonstrating excellent specific capacity and cyclic stability as a pseudocapacitance electrode.

Interferometric Fiber Optic Hydrophones (IFOHs) are highly sensitive for underwater acoustic detection but face challenges owing to the trade-off between laser monochromaticity and coherence length. In this study, we propose a pseudo-random binary sequence (PRBS) phase modulation method control For first time, establish clear theoretical model that quantitatively linked PRBS parameters length IFOH noise. Our findings indicate interference visibility, which represents length, is approximately...

Interferometric Fiber Optic Hydrophones (IFOHs) are highly sensitive for underwater acoustic detection but face challenges owing to the trade-off between laser monochromaticity and coherence length. In this study, we propose a pseudo-random binary sequence (PRBS) phase modulation method control For first time, establish clear theoretical model that quantitatively linked PRBS parameters length IFOH noise. Our findings indicate interference visibility, which represents length, is approximately...

The development of prototype metropolitan-scale quantum networks is underway and entails transmitting information via single photons through deployed optical fibers spanning several tens kilometers. major challenges in building are compensation for polarization fluctuation, high-precision clock synchronization, cumulative transmission time fluctuations. One approach addressing these to copropagate classical probe signals the same fiber as signal. Thus, both experience conditions, changes can...

In this paper, a low-crosstalk and polarization-independent inline interferometric optical fiber sensor array with four time division multiplexing (TDM) channels was demonstrated. The low level of the multireflection (MR) induced crosstalk realized by ultra-weak (<;1%) Bragg gratings (FBGs). FBGs were fabricated in single-mode without any fusion points pulling force phase mask matching method. A polarization switching (PS) method based on phase-generated carrier (PGC) scheme proposed to...

The process-based water system models have been transitioning from single-functional to integrated multi-objective and multi-functional since the worldwide digital upgrade of urban management. proliferation model complexity results in more significant uncertainty computational requirements. However, conventional calibration methods are insufficient dealing with extensive time limited monitoring samples. Here we introduce a novel machine learning designed expedite parameter optimization data...

To reduce the influence of redundant data on imaging accuracy in process electrical capacitance tomography (ECT) image reconstruction, we proposed a method to eliminate based hierarchical clustering (HC) algorithm. According characteristics obtained by sensor, used an HC algorithm classify data. Through simulation research four typical medium distributions, arrived at preliminary conclusion that there were more when was close sensor electrode, whereas redundancy phenomenon not obvious...

The acoustic pressure sensitivities of hollow-core photonic bandgap fibers (HC-PBFs) with different thicknesses silica outercladding and polymer jacket were experimentally investigated.Experiment a HC-PBF 7 μm-thick outer cladding 100 Parylene C demonstrated sensitivity 10 dB higher than the commercial HC-1550-02 fiber 25 standard single mode fiber.The significant enhancement in would simplify design hydrophone arrays increase number sensors that could be multiplexed fiber.

Free-space Quantum key distribution (QKD) has shown the potential for practical production of cryptographic ultra-secure communications. The performance any QKD system is ultimately limited by signal to noise ratio on single-photon channel, and over most useful communications links resulting rates are impractical performing continuous one-time-pad encryption today's broadband We have adapted clock data recovery techniques from modern telecommunications practice, combined with a synchronous...

We modeled the intensity noise of a distributed-feedback fiber laser (DFB-FL) with external injection. The transfer function for injected power perturbation was obtained. Simulation indicates that relaxation oscillation frequency is not affected by injection and determined pump power, which provides promising way to investigate actual budget over whole wavelength-division multiplexing (WDM) fiber-laser sensor array integrated in single fiber. enhancement each sensing unit thus can be...

An inline time-division multiplexing (TDM) fiber Fabry-Pérot sensor array based on the low-reflectivity Bragg gratings (FBGs) is promising for lots of sensing applications. The intrinsic multireflection (MR) between FBGs with same wavelength a serious problem, which induces crosstalk and generates false detection information. Furthermore, amplitude demodulated signal cannot reach stable state due to MR. Here, we presented full theoretical demonstration MR-induced fluctuation demodulation...

The development of prototype metropolitan-scale quantum networks is underway and entails transmitting information via single photons through deployed optical fibers spanning several tens kilometers. major challenges in building are compensation polarization mode dispersion, high-precision clock synchronization, for cumulative transmission time fluctuations. One approach addressing these to co-propagate classical probe signals the same fiber as signal. Thus, both experience conditions,...

Chemotherapy is a well-established method for treating cancer, but it has limited effectiveness due to its high dosage and harmful side effects. To address this issue, researchers have explored the use of photothermal agent nanoparticles as carriers precise drug release in vivo. In study, three different sizes polydopamine (PDA–1, PDA–2, PDA–3) were synthesized evaluated. PDA–2 was selected optimal size, encapsulation rate, loading rate. The from PDA–2@TAX tested at pH NIR laser irradiation...

We propose a novel and practical method to exactly measure the transient reflectance spectra (TRS) of adaptive filters based on dynamic population gratings. The modulating signals applied laser source play an important role. specially designed train triangular amplitude modulated pulses with small duty modulate frequency, then TRS was obtained from grating responses this pulse train. measured half-zero-point bandwidths filter without 2.6 m cavity length are 20 60 MHz, respectively. Our...

The polarization switching and phase generated carrier (PS-PGC) hybrid method is typically adopted to control signal fading induced by fiber birefringence precisely demodulate signals in interferometric Bragg grating (FBG) sensor arrays. Unlike simple PGC demodulation, the real-time delay between detected interference has more adverse effects as both demodulation accuracy background noise can be deteriorated, which may invalidate (PS) method. Aiming at this issue, its compensation were...

Relaxation oscillations in Er(3+)-doped and Yb(3+)/Er(3+) co-doped fiber grating lasers were investigated. Intensity noise models established for both cases which the fluctuations of pump power cavity loss analyzed. Simulation indicates that relaxation oscillation is induced by fluctuation, fluctuation can broaden peak enhance amplitude. The a laser with exhibits lower frequency larger amplitude than an laser. Distributed Bragg reflector fabricated, measured. For former, at magnitude several...

With the recent development of traffic networks, detector layout has become very complicated, due to complexity network structures and states. Thus, this paper presents an optimal method for based on centrality using complex theory. It mainly depends topology network, does not depend pre-conditions (e.g., OD (Origin Destination)) traffic, path prior matrix, so on) or consider route-choosing behavior too much. Considering travel time, demand, observation demand urban managers, dynamic...

As one of the most common mesoscale phenomena in ocean, ocean front is defined as a narrow transition zone between two water masses with obviously different properties. In this study, we proposed an reconstruction method based on K-means algorithm iterative hierarchical clustering sound speed profile (SSP). This constructed frontal from perspective SSP. Meanwhile, considering that acoustic ray tracing very sensitive tool for detecting location fronts because strong dependence transmission...

The optical nonlinear properties of CdSeS/ZnS quantum dots (QDs) are investigated by Z-scan technique using fundamental harmonic generation (1064 nm) mode-locked Nd:YAG laser for the first time. experimental results show that two photon absorptions (TPA) occur at input intensity up to 12.5 GW/cm2. QDs have an average TPA cross section 13710 GM and large refractive index on order 10-7 esu. nonlinearities perhaps allow be one kind candidate material bioimaging fluorescence label, limiting...