As mobile shopping has gradually become the mainstream mode, recommendation systems are gaining an increasingly wide adoption. Existing mainly based on explicit and implicit user behaviors. However, these behaviors may not directly indicate users' inner feelings, causing erroneous preference estimation thus leading to inaccurate recommendations. Inspired by our key observation correlation between pupil size we consider using change of when browsing model preferences, so as achieve targeted...

In this paper, with the aims of alleviating pressure from shortage spectrum resource and addressing inefficient utilization, we investigate sharing for moving vehicles in Heterogeneous Vehicular Networks (HVNs) consisting macrocells Road Side Units (RSUs) Cognitive Radio (CR) technology. We first propose an incentive mechanism encouraging to share vehicle users, which CR-enabled RSUs perform sensing availability surrounding urban environments. Furthermore, downlink allocation users...

Abstract Oligomeric acceptors are an effective π‐conjugate extension for small molecules because they effectively combine the advantages of polymeric and molecular acceptors. The choice linker group oligomer position is however crucial efficient expression π‐expansion advantages. Here, vinylene chosen as three oligomeric produced with different connecting positions or end‐groups. Under illumination, dimer acceptor dBTIC‐γV‐BO achieves best power conversion efficiencies 17.14% a T 80 lifetime...

Abstract The highly planar molecular structure is conducive to electron delocalization, thus facilitating efficient charge transport. A new thiophene terminal‐linked dimerized small‐molecular acceptor (DSMA), DTY‐2Cl, synthesized, which achieves high planarity with a bithiophene linkage. results of theoretical calculation and single crystal analysis regional configuration demonstrate that the twisting angle between binding unit DTY‐2Cl almost zero. Devices based on DTY‐2Cl:D18 show an...

Open AccessCCS ChemistryRESEARCH ARTICLES30 Jun 2024Molecular Skeletons Modification Induces Distinctive Aggregation Behaviors and Boosts the Efficiency Over 19% in Organic Solar Cells Hanjian Lai, Xue Yongwen Lang, Yongmin Luo, Liang Han, Yulin Zhu, Shilong Xiong, Xiangyu Shen, Yafei Ding, jiaying Wu, Gang Li Feng He Lai , Lang Luo Han Zhu Xiong Shen Ding Wu https://doi.org/10.31635/ccschem.024.202404482 SectionsSupplemental MaterialAboutPDF ToolsAdd to favoritesDownload CitationsTrack...

Selenium-containing materials are believed to expand the range of light absorption. The larger and more polarizable selenium atoms enable strong Se–Se interactions between molecules, which enhance both crystallinity electron mobility. Dimerized acceptor linked by end-groups exhibit reduced due sacrifices end-groups. To dimers, we substituted central core Y-series molecules with used selenophene as linker unit synthesize three dimer acceptors. introduction led a noteworthy increase in...

Improving the power conversion efficiency (PCE) and long-term stability are crucial for making organic solar cells (OSCs) commercially viable. Utilizing dimerized acceptors in quasi-planar heterojunction (Q-PHJ) architectures can significantly improve device stability. Halogenation, including fluorination chlorination, is a highly effective strategy enhancing performance ultimately improving PCE of OSCs with nonfullerene (NFAs). In this study, impact halogenation on photovoltaic properties...

The effect of isomerism in polymer donors is appealing as a means optimization molecular configurations organic solar cells (OSCs) but has not been well explored. Two isomers, PAB-α and PAB-γ, with different orientations their fused thiophene rings were designed synthesized to investigate the influence on photovoltaic conversions. It was shown that two polymers almost identical structures exhibited significant differences power conversion efficiency (PCE) devices. PAB-α-based devices achieve...

Correction for ‘Simple oxime functionalized fluorene polymers organic solar cells’ by Abdullah Adewale Adeoba et al. , Polym. Chem. 2024, 15 4474–4481.

Food safety public opinion in the prepared vegetable industry has a negative impact on development of industry. The lack as well school lunch standards, absence self-regulation, inadequacy regulatory system and low transparency information are deep-seated reasons for outbreak healthy requires joint efforts many parties. systematic construction standard is an important prerequisite orderly industry; real performance self-regulation internal incentive improvement perfection measures early...

It is challenging yet appealing for researchers to construct new polymer donors that can work cooperatively with the acceptors and thus realize maximum power conversion efficiencies (PCEs) of all-polymer solar cells (PSCs). We have synthesized two dithieno[3,2-f:2′,3′-h]quinoxaline-based wide band gap donor polymers (PBQx-Me-TF PBQx-H-TF) a γ-position based narrow acceptor: PBTIC-γ-TT. The temperature-dependent absorption spectra showed removal weaker electron-donating methyl group in...

Morphology instability holds the major responsibility for efficiency degradation of organic solar cells (OSCs). However, how to develop polymer donors simultaneously with high and excellent morphology stability remains challenging. Herein, we reported naphtho[2,1-b:3,4-b']dithiophene-5,6-imide (NDTI)-based new polymers PNDT1 PNDT2. The alkyl chain engineering leads crystallinity, hole mobility (>10-3 cm2 V-1 S-1), nanofibrous film morphology, which enable PNDT2 exhibit an 18.13% a remarkable...

Chlorine substitution, as an effective and low-cost modification strategy, has been applied in the design of donor acceptor structures organic solar cells. We synthesized a series chlorinated dimerized acceptors to investigate effect chlorine numbers locations on photovoltaic properties. The results show that planarity morphology DYV-γ-2Cl are greatly improved due appropriate positions substituted atoms. Therefore, device based PM6:DYV-γ-2Cl achieves superior power conversion efficiency...

It is arguable whether individuals with T1-T2 papillary thyroid cancer (PTC) who have a clinically negative (cN0) diagnosis should undergo prophylactic central lymph node dissection (pCLND) on routine basis. Many inflammatory indices, including the neutrophil-to-lymphocyte ratio (NLR), platelet-to-lymphocyte (PLR), monocyte-to-lymphocyte (MLR), and systemic immune-inflammatory index (SII), been reported in PTC. However, associations between inflammation response (SIRI) risk of metastasis...

Organic solar cells (OSCs) with low-temperature solution processing have attracted extensive research. To achieve well-phase separation and molecular nucleation crystallization, the active layer usually needs to be processed low...

Abstract End group modification is a crucial strategy for fine‐tuning non‐fullerene acceptors in organic solar cells (OSCs). Extending the conjugation of end groups enhances electron delocalization, promotes tighter intermolecular stacking, and improves crystallinity spectral absorption. In this study, series isomeric dimer with conjugation‐extended synthesized to investigate how position extension affects performance dimers. Using one‐pot Still coupling method, three dimers inner extensions...

Three non-fullerene acceptors with benzonitrile groups were synthesized, which could reduce the non-radiative recombination energy loss and enhance efficiency in organic solar devices.

Mathematical relationship between porosity and thermal conductivity coefficient of foamed concrete was deduced according to the principle calculus. model on equivalent established based serial parallel network models resistance. Porosities coefficients dry with different densities were measured. Applicability mathematical analyzed comparison theoretical values measured values. Thermal decreases as increases. There is a linear coefficient. Theoretical resistance has smaller deflection than...