A latent olefin metathesis catalyst, bearing two polymeric NHC ligands, was embedded in a semicrystalline polymer matrix containing cyclic olefins. The catalyst activated by straining the solid material under compression, resulting polymerization and cross-linking reactions of monomers situ. Catalyst activation state may be employed new self-healing materials.

Vision-and-Language Navigation (VLN), as a crucial research problem of Embodied AI, requires an embodied agent to navigate through complex 3D environments following natural language instructions. Recent has highlighted the promising capacity large models (LLMs) in VLN by improving navigational reasoning accuracy and interpretability. However, their predominant use offline manner usually suffers from substantial domain gap between task LLM training corpus. This paper proposes novel strategy...

Four catalysts, viz. 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD), potassium bis(trimethylsilyl)amide (KHMDS), methoxide (KOMe), and tert-butoxide (KO-t-Bu), are screened for a low-toxicity route toward (poly)urethane/urea preparation from carbonate/carbamate esters. On the basis of similar kinetics, catalytically active species KHMDS, KO-t-Bu, KOMe is inferred to be alkoxide anion RO–, depending on R group in carbonate/carbamate. Its activity much higher than that TBD. Computational simulation...

In the study of brain-computer interfaces (BCIs) based on steady-state visual evoked potentials (SSVEPs), how to improve classification accuracies BCIs has always been focus researchers. Canonical correlation analysis (CCA) is widely used in BCI systems SSVEPs because its rapidity and scalability. However, classical CCA algorithm encounters difficulty low accuracy a short time. For targetless stimuli, this paper proposes fusion (CCA-CWT-SVM) that combined with CCA, continuous wavelet...

Abstract The dissolution behavior of hydroxyapatite (HA) and its effect on the initial cellular response is both fundamental clinical importance. In this study, plasma-sprayed HA coatings were characterized by X-ray diffraction Fourier transform infrared spectroscopy (FTIR). Calcium (Ca) inorganic phosphorous (Pi) ions released from within 3 weeks measured flame atomic absorption colorimetrically molybdenum blue complex, respectively. To investigate osteoblast response, additional Ca Pi...

Abstract Here, an isocyanate‐free approach to produce polyureas from diamines and dicarbamates as monomers is reported. A side reaction limiting the molecular weight during diamine/ dicarbamate polymerization, that is, N‐alkylation of amine end groups, investigated. Mitigation N‐alkylation, either by enhancing carbamate aminolysis rate or substitution dimethylcarbamates with more sterically hindered diethylcarbamates, affords sufficiently high weights assure satisfactory mechanical...

With integration of large-scale renewable energy, new controllable devices, and required reinforcement power grids, modern systems have typical characteristics such as uncertainty, vulnerability openness, which makes operation control grids face severe security challenges.Application artificial intelligence (AI) technologies represented by machine learning in grid regulation is limited reliability, interpretability generalization ability complex modeling.Mode hybrid-augmented (HAI) based on...

Objectives To assess the demands for support measures of healthcare workers (HCWs) in China’s high-workload provinces during COVID-19 pandemic and identify specific needs to make evidence-based recommendations. Design Prospective cross-sectional study. Setting Conducted three Chinese characterised by their significant pandemic. Participants The study comprised 683 HCWs, including doctors, nurses, resident physicians hospital administrators. sample was predominantly female (68.1%), with...

Traditional Hessian multiscale filter consider only the local geometric feature but not global grayscale information. In medical image analysis, is usually used to enhance blood vessels. However, it also produces some pseudo va

A series of cholesteryl-containing imidazolium chlorides and tetrachloroaluminates were synthesised, the chemical structure, liquid crystalline behaviour ionic conductivity characterised by several technical methods. Whereas show chiral smectic (SmA*) phase on heating cooling cycles, display nematic (N*) phase, which is uncommon for crystals (ILCs). The similar transition temperature entropy, indicating cholesteryl component influence predominately rather than different alkyl substituent...

Phytochemical investigation on the ethanol extract of green walnut husks (Juglans mandshurica Maxim.) led to isolation two previously unknown compounds, including a macrolide compound (13S)-8-oxo-(9E, 11E)-8-oxo-octadeca-9,11-dien-13-olide (1) and diarylheptanoid 1-(3'-methoxy-4'-hydroxyphenyl)-7-(3″,4″-dimethoxyphenyl)heptan-3-one (2), together with 19 known compounds. The structures these 21 compounds were elucidated by extensive analyses NMR HR-MS data, basis spectroscopic analysis.

For decades, a great deal of interest in investigating brain network functional connective features has arisen brain-computer interfaces (BCIs) based on steady-state visual evoked potentials (SSVEPs). Traditional decoding algorithms, for example, canonical correlation analysis (CCA), only consider the inherent properties each channel terms feature extraction single electroencephalogram (EEG) signal, with inadequate that cannot fully utilize information transmitted by brain. This paper...

In the study of motor imagery (MI) brain-computer interfaces (BCIs), how to improve task classification accuracy has been always one major challenges in applications MI-BCIs. As a type crucial temporal and spatial feature, nonlinear Granger Causality (NGC) analysis was applied feature extraction MI-electroencephalogram (EEG) signals because constructed brain network features can reflect causal relationship between different channels various regions. However, MI-BCI recognition often suffer...

This paper is the first to estimate health benefits of largest inter-basin water diversion project in world, namely, Chinese South–North Water Transfer (SNWT) project. Using detailed household-level data, we exploit natural experimental setting middle route SNWT implement a difference discontinuity design. We find that reduced incidences waterborne diseases and cancer by more than 25% 16%, respectively. The cost-benefit analysis shows outweigh construction costs 4–10 years, which highlights...

Abstract t ‐Butyl‐oxycarbonylated diamines (“di‐Boc‐carbamates”) are investigated as dicarbamate monomers for diamine/dicarbamate polymerizations. Polyureas (PUs) and polyurethanes (PURs) with high molecular weights prepared from stoichiometric polymerizations of or diols N‐N′ ‐di‐ ‐butyl‐oxycarbonyl isophorone diamine (DiBoc‐IPDC) using KO ‐Bu a catalyst, while gelation is observed when an excess DiBoc‐IPDC used respect to the diols. Stable dispersions obtained PUs PURs 3,3′‐diamino‐ N...

ABSTRACT An isocyanate‐free strategy for the preparation of anionically stabilized water‐borne polyurea (PU) dispersions was developed with diamines, dicarbamates, and dianhydrides as monomers. Poly(amic acid urea)s (PAAUs) number average molecular weights up to 34 kDa were synthesized from ethylenediaminetetraacetic dianhydride diamine‐functional PUs. The latter produced polymerization dicarbamates diamines. factors that affected particle sizes corresponding PAAU investigated. Water‐borne...