Objective: To carry out meaningful comparisons on results of different research studies mild cognitive impairment (MCI), it is critical to select an appropriate objective memory test examine deficit. We aim refine the operational criteria amnestic MCI (aMCI) neuropsychological tests that optimally balance sensitivity and specificity. Methods: focused 206 non-demented subjects from clinic. then classified each individual as having or subjective decline (SCD) according criteria. By following...

The photoluminescent properties of atomically precise metal nanoclusters (MCs) have garnered significant attention in the fields chemical sensing and biological imaging. However, limited brightness single-component hinders their practical applications, conventional ligand engineering approaches proven insufficient enhancing emission efficiency MCs. Here, we present a DNA framework-guided strategy to prepare highly luminescent cluster nanoaggregates. Our approach involves an amphiphilic...

A sensing structure consisting of a short multimode fiber (MMF) spliced in just upstream uniform Bragg grating (FBG) is proposed and experimentally demonstrated for temperature-independent curvature measurement. The MMF section generates cladding modes the that contains FBG. Several these get reflected back by FBG at shorter wavelengths re-enter launch after passing through section. net recoupling efficiency between incident forward core mode -20 dB when straight, but decays applied on...

Abstract The best instrument to measure the refractive index of liquids is Abbe refractometer which can only provide accuracies order 10 −5 at visible wavelengths and −4 in near infrared. Here we present a technique by exact wavelength positions infrared frequency comb tilted grating inscribed core an optical fiber be used absolute value liquid inserted, with accuracy ±5×10 . This contrast typical optic‐based “refractometry” where variations measured accurately, hence appellation “true”...

Photothermal therapy (PTT) is regarded as one of the potential techniques to replace surgery in treatment tumors. Polyaniline (PANI) shows better biocompatibility than inorganic reagents, which has been widely used tumor photoacoustic (PA) imaging and PTT. However, poor water solubility nonspecific aggregation PANI nanoparticles severely restricted their biomedical application. In addition, it difficult control photothermal effect just on cancer cells. Herein, we develop pH-responsive...

A novel hot-wire anemometer based on a silver-coated optical fiber Bragg grating (FBG) is proposed and experimentally demonstrated with the assistance of short length no-core (NCF). The silver coating deposited surface FBG absorbs light pump laser, which coupled into cladding by NCF, to generate heat, whereas air flow cools down taking heat away. dynamic thermal equilibrium temperature codetermined laser power airflow velocity can be reached. wavelength changes thus used measure velocity....

An optical fiber thermal anemometer is proposed based on a silver film-coated Bragg grating (FBG) assisted by core offset fusion splice. Light from pump laser propagating along the coupled into cladding splice and absorbed film to generate heat increase temperature of FBG. Air flow cools down FBG its velocity can be measured wavelength shift Experimental results show that allows high resolution 0.022 m/s in range up 6 m/s.

Cesium lead halide perovskite nanocrystals (CsPbX3, X = Cl, Br, I) have been reported as efficient light-harvesting and light-emitting semiconductor materials, but their nonlinear optical properties seldom touched upon. In this paper, we prepare layered CsPbBr3 nanocrystal films characterize physical properties. Broadband linear absorption from ∼0.8 to over 2.2 μm at the 1-μm wavelength region are measured. The saturable absorber (SA), manufactured by drop-casting of colloidal liquid...

Polyphenols with antioxidant properties are of significant interest in medical and pharmaceutical applications. Given the diverse range activities polyphenols vivo, accurate detection these compounds plays a crucial role nutritional surveillance development. Yet, efficient quantitation polyphenol contents qualification monomer compositions present notable challenge when studying bioavailability. In this study, platinum-modified nickel-iron layered double hydroxide (Pt/NiFe-LDH hybrids) were...

Abstract Identifying the intentions of aerial targets is crucial for air situation understanding and decision making. Deep learning, with its powerful feature learning representation capability, has become a key means to achieve higher performance in target intention recognition (ATIR). However, conventional supervised deep methods rely on abundant labelled samples training, which are difficult quickly obtain practical scenarios, posing significant challenge effectiveness training models. To...

Nitrogen dioxide (NO2) is broadly acknowledged as one of the six key air pollutants, posing a significant threat to environmental stability and human health. The profile atmospheric nitrogen required for quantifying NO2 emissions from fossil fuel combustion industry. In continuous-wave differential absorption lidar (CW-DIAL) systems, laser sources employed are subject issues varying output characteristics poor instability. This study presents CW-DIAL system remote sensing that employs...

Passivation (PV) layers could effectively improve the positive gate bias-stress (PGBS) stability of amorphous InGaZnO (a-IGZO) thin-film transistors (TFTs), whereas related physical mechanism remains unclear. In this study, SiO₂ or Al₂O₃ films with different thicknesses were used to passivate a-IGZO TFTs, making devices more stable during PGBS tests. With increase in PV layer thickness, TFTs improved due stronger barrier effect layers. When thickness was larger than characteristic length,...

Graphitic carbon nitrides (CNs) have appeared as a new type of photocatalyst for water splitting, but their optical properties (e.g., nonlinear absorption), to the best our knowledge, been seldom explored. Here, we report saturable absorption effects novel 2D carbon-nitride-type nanosheets and use them absorbers passively mode-lock Yb-doped fiber lasers. The CN-based absorber is manufactured by solution coating CN on gold mirror has modulation depth saturation intensity 12.5% 7.5 MW/cm2,...

A novel, to the best of our knowledge, reflective sensor fabricated by simply sandwiching a homemade hollow core Bragg fiber (HCBF) between two single-mode fibers is proposed and demonstrated for simultaneous measurement temperature strain. Different from traditional Fabry-Perot interferometer (FPI) sensors that can achieve only one-parameter sensing with inevitable cross-correspondence other parameters, based on HCBF, which functions as an FPI-inducing FPI spectrum pattern weak waveguide...

A novel inline Mach-Zehnder interferometric (MZI) sensor based on a homemade grapefruit microstructured fiber (GMF) was proposed and experimentally demonstrated. The sensing unit consists of short segment GMF sandwiched between two single mode fibers using lateral offset splicing. fabrication the GMF-based MZI introduced. Mode analysis theoretical simulation were investigated matched well with experimental results. performance for temperature strain tested. sensitivity are 1.97pm/μɛ 37pm/°C,...

In this paper, we report a passively Q-switched and mode-locked ytterbium fiber laser employing Bi2S3 nanowire as saturable absorber (SA). The Q-switching mode-locking can be achieved in the same cavity at pump power through carefully rotating intra-cavity polarization controller. experiment, maximum output pulse energy is 157.2 nJ with repetition rate of 22.26 kHz 116.7 mW, while for passive mode-locking, train has 3.94 MHz, width 782 ps SNR ~49 dB. wavelength are both centered ~1038 nm, 3...

The nonlinear absorption and optical limiting properties of a chiral polymer were investigated by employing Z-scan technique in femtosecond regime. Reverse saturable was observed the at 800 nm coefficient 5.97 cm/GW obtained irradiance 2.75 GW/cm2. versus input measured to meet linear increasing function, giving evidence two-photon induced excited-state existing. Particularly, shown possess large ratio (∼251) ground-state cross-section remarkable behavior achieved it.

A tunable passively Q-switched fiber laser is fabricated using a graphene saturable absorber. The absorber composed of tapered coated with nanosheets. It combines the abilities and power-dependent filter, thereby simplifying structure laser. transmission peak linearly dependent on input power temperature, slopes approximately -0.35 nm/mW -3.63 nm/°C, respectively. exhibits wavelength range 7 nm (from 1558 to 1565 nm). output pulse offers shortest duration 2.22 μs repetition rate 39.1 kHz...