A series of unreported aluminum complexes supported by asymmetrically O,N,N,O-quadridentate hemi-salen ligands were synthesized binaphthyl-imine derivatives. These characterized and used as catalysts in rac-lactide or l-lactide polymerization. The X-ray diffraction analysis showed that molecular structures (S)-3 (rac)-4 mononuclear coordination compounds with five-coordinated atoms the solid state. Using 2-propanol cocatalyst, complex (S)-6 revealed highest activity among these toward...

A series of zinc complexes based on asymmetrical N,N,O-tridentate ligands were prepared via binaphthyl diamine derivatives. These characterized and employed as catalysts in lactide polymerization. The X-ray diffraction analyses revealed that molecular structures 1b 2b mononuclear with atoms distorted octahedral geometries. Upon co-catalysis isopropanol, complex 2a showed the highest activity among these for ring-opening polymerization L-lactide, 3a exhibited stereoselectivity rac-lactide...

Object detection in remote sensing imagery poses significant challenges due to the vast scale variations and longtail class distributions inherent these scenarios. Traditional object detectors often struggle balance conflicting requirements of translation invariance for classification equivariance localization. In this paper, we propose a Decoupled Multi-class Detection (DMOD) framework designed address challenges. The DMOD introduces novel decoupling strategy, which separates optimization...

The fullPIERS (Pre‐eclampsia Integrated Estimate of RiSk) model is a promising tool for the prediction adverse outcomes in pre‐eclampsia, developed using worst values predictor variables measured within 48 hours admission. We reassessed performance obtained 6 and 24 admission, found that stratification capacity, calibration ability, classification accuracy remained high. accurate as rule‐in test maternal outcome, with likelihood ratio 14.8 (95% CI 9.1–24.1) or 17.5 11.7–26.3) based on 6‐...

ABSTRACT A series of bimetallic aluminum Schiff‐base complexes have been prepared and characterized. The used as catalysts were applied in the lactide polymerization to test their activities stereoselectivities. All polymerizations are living, evidenced by narrow polydispersities good fit between calculated found number‐average molecular weights isolated polymers. Isotactic enriched polylactide was obtained using these complexes. Kinetic studies indicated that both first‐ordered with respect...

Three kinds of bimetallic Schiff base titanium complexes with different substituent moieties on organic ligands were synthesized. Ring‐opening polymerizations (ROP) lactides carried out by using these as catalysts. The polymerization data and kinetic studies showed that complex 1a had the highest activity 2a lowest for ROP lactides. Moreover, all three newly synthesized higher better molecular weight control than their monometallic counterparts reported in our previous work.

This paper is aimed at the telemetry data of Luojia1-01 satellite attitude control system, and carries out research on high-dimensional feature extraction fault detection based supervised local linear embedding (SLLE). Because general method can not mine information nonlinear data, a designed. Combined with statistics SPE T <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> , low-dimensional obtained for monitoring faults. Due to embedded...

This paper studies robust adaptive Kalman filtering and smoothing problems for the linear state-space model with heavy-tailed multiplicative (measurement) noise additive (process measurement) noises. First, to noises, state transition measurement likelihood densities are modeled as two generalized <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">t</i> distributions. Then, unknown covariance matrices of process noises inverse Wishart...

Many electronic loads in DC distribution systems behave as constant-power (CPLs) which are known to exhibit negative incremental impedance and have destabilizing effect the system. To improve stability of with CPLs, research efforts been focused on impedance-based criterion, design advanced controllers, passive or active damping solutions. In this paper, an adaptive method based is proposed. Therein, load bus voltage monitored damper used stabilize system once instability detected. The...

Addressing the problems of insurmountable unknown frictional disturbance and balancing trade-off between high maneuverability stability during attitude maneuver are important in low-cost miniaturized single control moment gyro clusters (SGCMGs) for hyper-agile satellite. This paper proposes a new concept reconfigurable octagonal cone-type SGCMGs by considering practical engineering requirements satellites. Firstly, momentum characteristics typical configurations quantitatively explained,...

Ti3SiC2 based ceramic reinforced by 5 wt-% graphene nanoplatelets (GNPs) was prepared hot pressing at 1550°C for 1 h under a uniaxial pressure load of 30 MPa. The effects GNPs on the strengthening and toughening pressed were investigated. Comparing with t monolithic ceramic, flexural strength facture toughness Ti3SiC2–GNP significantly improved. fracture increased from 451.9 to 800.6 MPa, 6.23 9.67 MPa m1/2 respectively. mechanism these mechanical property improvements attributed layered...

In Energy Internet mode, a large number of alarm information is generated when equipment exception and multiple faults in power grid, which seriously affects the collection, fault analysis delays accident treatment for monitors. To this point, paper proposed method grid monitoring to monitor diagnose real time, constructed logical model based on five section information, built standard set, realized optimization, location, type diagnosis, false-report message missing-report using matching...

Aiming at the attitude disturbance of airborne ground tracking system and problem pointing stability under high-frequency vibration, effectively utilizing wind power outside cabin, a new type simulation platform-wind pendulum control is designed, designed to TMS320F28335 For main chip, controller adopts an improved genetic PID algorithm realize function rapid braking movement according any desired trajectory. The results show that, compared with traditional algorithm, can better solve...

Tightly regulated fast electronic loads are known to behave like constant-power (CPLs) and exhibit negative incremental impedance. CPLs can be found in many applications such as power systems of aircraft, ships, vehicles, etc. While each CPL has its own controller, the stability entire integrated system might not guaranteed due CPL's destabilizing effect. In this paper, an adaptive method is proposed stabilize by monitoring DC bus voltage enabling active damping circuit depending on...

We investigate the nonlinear optical response of graphene nanoribbon (GNR) heterojunctions both without and with one or multiple topological interface states. By implementing a distant-neighbor quantum-mechanical (DNQM) method, we demonstrate pronounced enhancement GNR as number states at their interfaces increases. Specifically, find that exhibit notably stronger third-order in comparison similarly sized counterparts single state such Furthermore, observe presence can induce significant...

The reconfigurability metric of distributed control torque gyro (CMG) Jilin-1 super agile satellite is studied, and a CMG under energy constraints proposed in this paper. According to the design requirements for attitude system satellite, linear dynamics kinematic equations expressed form state space are established, Gram matrix measurement scheme designed. minimum eigenvalue used as criterion evaluating CMG. Finally, reconfigurable simulation experiment performed on CMGs, results verify...

The denoising of SEM images and extracting image information have attracted attention in the micro-nano research fields. In this paper, we analyze noise types characteristics propose method deep convolutional neural network to denoise images. On basis denoising, suitable methods are used identify position single, multiple nanowires positional relationship depth direction. Because special imaging principles, there many differences between ordinary gray To image, has more significant...