Aromatic difluoroboron β-diketonate complexes (BF2bdks) are classic fluorescent molecules that have been explored as photochemical reagents, two-photon dyes, and oxygen sensors. To gain a better understanding of their emissive properties in both solution polymer matrices, BF2bdks with varying aromatic groups were synthesized photophysical investigated methylene chloride poly(lactic acid) (PLA). Absorption spectra showed systematic variations well correlated structural features, including the...

Halide-substituted difluoroboron β-diketonates were synthesized and display mechanochromic luminescence quenching. Material structure is halide dependent dynamic recovery properties for dyes are slower than the hydrogen counterpart.

Difluoroboron β-diketonate (BF2bdk) dyes display reversible mechanochromic luminescence (ML) in the solid state. A series of BF2bdk with methyl, phenyl, naphthyl and anthracyl groups (i.e. arene substituents bdk ligands: Me–Ph = mbm, Ph–Ph dbm, Np–Ph nbm, An–Ph abm) were prepared to test effects π conjugation length size on ML properties. Solid-state emission spectra recorded for powders, spin-cast films, dye coated weighing paper. The materials emit at various wavelengths from blue red,...

The structure and mechanical properties of crystalline materials three boron difluoride dibenzoylmethane (BF2dbm) derivatives were investigated to examine the correlation, if any, among mechanochromic luminescence (ML) behaviour, solid-state structure, behaviour single crystals. Qualitative deformation tests show that crystals BF2dbm( (t) Bu)2 can be bent permanently, whereas those BF2dbm(OMe)2 exhibit an inhomogeneous shearing mode deformation, finally BF2dbmOMe are brittle. Quantitative...

Difluoroboron β-diketonates (BF2 bdks) show both fluorescence (F) and room-temperature phosphorescence (RTP) when confined to a rigid matrix, such as poly(lactic acid). These materials have been utilized optical oxygen sensors (e.g., in tumors, wounds, cells). Spectral features include charge transfer (CT) from the major aromatic donor dioxaborine acceptor. A series of naphthyl-phenyl dyes nbm) (1-6) were prepared test heavy-atom placement effects. The BF2 nbm dye (1) was substituted with Br...

Amino acids are well known as natural stimulators of plant growth and widely used to promote crop yield quality. Several studies have been conducted investigate the effects amino acid (s) a foliar spray on variety species. However, soil amendment different concentrations water-soluble fertilizer physiological characteristics, yield, quality pepper remain unclear. Following this, three experimental sets in ratio 1.8: 2.7: 3.6 kg including control (CK) were Lintao county, Gansu province. The...

The interferometric phases in highly sloped terrain have the characteristics of large fringe density, narrow width, low correlation, and under-sampling. local frequ- ency (LFF) is a criterion to evaluate trend magnitude gradient can be employed improve quality interferograms. results traditional LFF estimation method affected by phase noise, sometimes unwrapping (PU) operation also required for some regions. When it comes terrain, phenomenon under-sampling may cause incorrectness absolute...

In this paper, a modified two-layer scattering model is applied to three-stage algorithm for high-precision retrieval of forest parameters from Polarimetric Synthetic Aperture Radar Interferometry (Pol-InSAR) data. Traditional Random-Volume-over-Ground (RVoG) considers target as combination flat ground and volumetric canopy. However, when it comes sloped terrain, the inversion accuracy process deteriorates with ascending estimation error in volume correlation which mainly caused by existence...

Phase unwrapping (PU) is a key step of interferometric SAR signal processing. The accuracy the phase directly affects digital elevation model (DEM). traditional path-integral methods and global-planning cannot take into account both PU processing efficiency, causes error diffusion large-area holes. To solve these problems, this study proposed an improved strategy based on dynamic adjacent table. For problem holes that appears in methods, introduces local quality maps to guide operation,...

In highly sloped terrain, the interferometric phase gradients of adjacent pixels are more than π . Therefore, conventional unwrapping methods cannot correctly obtain absolute phase. To solve this problem, a method based on multi‐frequency synthetic aperture radar (MF‐InSAR) is proposed. method, joint probability density function MF‐InSAR established to estimate gradient in and thanks small changes differences between pixels, an set further proposed improve robust algorithm. After...

Multifrequency (MF) interferometric synthetic aperture radar (InSAR) phase unwrapping (PU) technology is proposed for PU in steep terrains where the changes of adjacent pixels exceed commonly required threshold <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\pi $ </tex-math></inline-formula> . Traditional MF methods will fail case extremely terrain such as artificial buildings due to insufficient quality...

In this paper, a creative hybrid adaptive filtering algorithm is designed to combine modified mode filter with an median for the suppression of interferometric phase noise which quality insurance following unwrapping operation. This combination provides remarkable flexibility terrain. At first, paper presents shortest sub-interval estimator. Then, it uses result as variable local center and improves window varying residue density correlation coefficient. Finally, proposed reduction noise....

Compared with LEO SAR, the orbital altitude of GEO SAR is higher and eccentricity larger, so spatial decorrelation model traditional repeat pass InSAR can not be applicable for InSAR. Considering special problems InSAR, a established which expressions coefficient critical baseline are derived. Finally, in simulated when J2 perturbation considered.

Image registration is a key step in signal processing of interferometric SAR. Traditional real correlation method common and robust approach for InSAR images registration. When the distortion between two SAR large complex, accuracy this traditional limited. To enhance accuracy, paper proposes an improved strategy with three improvements comparing algorithm. Firstly, adjacent sample windows overlapping search are employed window partitioning. Secondly, two-step singular points removal...

This paper proposes a multidisciplinary multi-objective optimization method for vehicle Crashworthiness design. Multi-objective methods are discussed. Considering the objective functions with difference dimensions, we improve -method based on normalizes function. As numerical example, crashworthiness design problem is calculated, and compare results SO method, interior point active-set where improved -method. Examples indicate that this algorithm has less number of iteration than others. DOI...

This paper first introduces the basic concepts of precision guidance technology and artificial intelligence technology. Then gives a brief introduction intelligent technology, with help development weapon based on deep learning project in foreign: LRASM missile project, TRACE BLADE this an overview current foreign Finally, future trend is summarized, mainly concentrated multi objectives, classification, weak target detection recognition, between complex environment jamming multi-source,...