A facile iodine-mediated decarboxylative cyclization from α-amino acids and N-heterocyclic carbaldehydes was developed. By virtue of this method, a series imidazo[1,5-a]N-heterocycles can be synthesized efficiently under mild conditions. tentative reaction mechanism proposed based on the experimental results previous reports.

Navigation and positioning technology is closely related to our routine life activities, from travel aerospace. Recently it has been found that Cataglyphis (a kind of desert ant) able detect the polarization direction skylight navigate according this information. This paper presents a real-time bionic camera-based navigation sensor. sensor two work modes: one single-point measurement mode other multi-point mode. An indoor calibration experiment done under beam standard polarized light. The...

Novel DNA-MMT hybrid supported metal nanoparticle catalysts, such as Pt/DNA-MMT, Pd/DNA-MMT, Au/DNA-MMT, were prepared for application in highly selective aerobic oxidation of primary alcohols to aldehydes, acids and esters, respectively. Taking advantage the water-soluble reversibility these all transformations could be performed smoothly water reuse catalysts has also been accomplished by a very simple phase separation process.

For most of the attention-based sequence-to-sequence models, decoder predicts output sequence conditioned on entire input processed by encoder. The asynchronous problem between encoding and decoding makes these models difficult to be applied for online speech recognition. In this paper, we propose a model named synchronous transformer address problem, which can predict chunk chunk. Once fixed-length is encoder, begins symbols immediately. During training, forward-backward algorithm...

Non-autoregressive transformer models have achieved extremely fast inference speed and comparable performance with autoregressive sequence-to-sequence in neural machine translation.Most of the non-autoregressive transformers decode target sequence from a predefined-length mask sequence.If predefined length is too long, it will cause lot redundant calculations.If shorter than sequence, hurt model.To address this problem improve speed, we propose spike-triggered model for end-to-end speech...

Although attention based end-to-end models have achieved promising performance in speech recognition, the multi-pass forward computation beam-search increases inference time cost, which limits their practical applications.To address this issue, we propose a non-autoregressive recognition system called LASO (listen attentively, and spell once).Because of property, predicts textual token sequence without dependence on other tokens.Without beam-search, one-pass propagation much reduces cost...

This article presents a framework for 3D reconstruction of colonic surface using stereo colonoscopic images. Due to the limited overlaps between consecutive frames and nonexistence large loop closures during normal screening colonoscopy, state-of-art simultaneous localization mapping (SLAM) algorithms cannot be directly applied this scenario, thus colon model segmented from CT scans is used together with colonosocopic images achieve high accuracy. The proposed includes scan (point cloud RGB...

A facile CuI-catalyzed and air promoted oxidative cyclization was developed for the synthesis of polyarylated oxazoles. By virtue this method, a variety arylated oxazoles could be easily synthesized from readily available starting materials at room temperature in air.

Abstract A cascade oxidative cyclization reaction for the synthesis of chromone derivatives was developed by using LiO t Bu as a mediator and air an oxidant. The carried out without assistance transition metal under mild conditions to afford chromones in good yields with high regioselectivities.

Abstract Three-dimensional (3D) direct writing based on the meniscus-confined electrodeposition of copper metal wires was used in this study to develop vertical capacitive microelectromechanical switches. Vertical switches reduce form factor and increase area density such devices integrated circuits. We studied electromechanical characteristics by exploring dependence switching voltage various device structures, particularly with regard length, wire diameter, distance between two wires. A...

Abstract A fluorescence polarization competitive assay was developed to efficiently screen and evaluate inhibitors of PCAF bromodomain/Tat‐AcK50 protein–peptide interaction. series pyridine 1‐oxide derivatives were synthesized evaluated. Some the novel compounds, 2‐(3‐aminopropylamino) derivatives, could be effective association. Specifically, 2‐(3‐aminopropylamino)‐5‐(hydroxymethyl)pyridine hydrochloride ( 15 ) 5‐((3‐aminopropylamino)methyl) derivative 20 found ligands for BRD pocket. First...

Alkyl chain engineering is widely used to prepare high-performance donor materials. However, relatively few studies have been focused on the alkyl optimization of acceptor Herein, a series new A–D–A (acceptor–donor–acceptor) type small molecule acceptors (ITBTR-C2, ITBTR-C4, ITBTR-C6, and ITBTR-C8) with indacenodithieno[3,2-b]thiophene (IDTT) as core, benzothiadiazole (BT) π bridge, ethyl-, butyl-, hexyl-, octyl-substituted 2-(1,1-dicyanomethylene) rhodanine end groups, respectively, are...

Human p300/CBP associated factor bromodomain (PCAF BRD), a relatively conserved host cell protein, can selectively bind with Tat-AcK50 (tat acetylated lys50). This interaction is essential for the transcription activation of HIV-1 viral gene, therefore PCAF BRD provides potential targeting protein to inhibit transcription. We synthesized series N1-aryl-propane-1,3-diamine compounds BRD. And cellular level anti-HIV-1 assay showed that these small molecules had good inhibitory potency on...

Users in a hotspot area may experience low Quality of Service (QoS) owing to the high traffic demands and limited bandwidth resources downloading from nearby Macro Base Station (MBS). Deploying Drone Stations (DBSs) over help MBS transmit users is an efficient way improve user QoS. Essentially, DBSs are considered as relay nodes, which deployed close users, with data rates. This paper discusses multiple 3D deployment strategy given area, i.e., determining latitude, longitude, altitude each...

The ability to navigate in complex environments is crucial for both animals and mobile robots. Most robots adopt dead reckoning navigation because of its high efficiency low cost. In order use this mechanism, distance information directional must be available. research, a real-time three-channel camera-based polarization sensor developed provide robot navigation. accuracy the can kept within 0.3 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...

Depth map estimation is a classical problem in computer vision. Conventional depth relies on stereo/multi-view matching or sensing devices alone. In this paper, we propose system which addresses high resolution and quality based joint fusion of stereo Kinect data. The formulated as maximum posteriori probability (MAP) reliability two are derived. estimated further refined by color image guided matting 2D polynomial regression (LPR)-based filtering. Experimental results show that our can...

This paper aims to study the construction of 3D temperature distribution reconstruction system based on binocular vision technology. Initially, a traditional calibration method cannot be directly used, because thermal infrared camera is only sensitive temperature. Therefore, calibrated separately. Belief propagation algorithm also investigated and its smooth model improved in terms stereo matching optimize mismatching rate. Finally, built point cloud 2D information. Experimental results show...

This paper proposes a movable image-based rendering (M-IBR) system for improving the viewing freedom and environmental modeling capability of conventional static IBR systems. The supports object-based 3-D reconstruction consists three main components. <orderedlist continuation="restarts" numeration="arabic" posttext=")" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><listitem><para>An improved video stabilization method to reduce shaky motion...

In this paper, we propose an improved UWB based indoor localization system using Bayesian filtering techniques. The contains two key components: (1) miniaturized, high updating rate and highly reconfigurable sensors with a linear regression model to calibrate range measurement errors; (2) set of filters which can improve the precision by utilizing spatial correlation between stationary base stations mobile station. Furthermore, novel transform is proposed reduce computational complexity....