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Cooperative of multiple nonholonomic vehicles can be converted into tracking problems of a single-vehicle. The reference trajectory design within distributed features for each vehicle in the group is addressed in this note. The motivation is that nonholonomic vehicles cannot achieve asymptotical stabilization of non-feasible reference signals, and modifications about the virtual reference trajectory design are needed. Reduced-order design and time-varying technique, and some simple geometry tricks are applied to derive the dynamic reference trajectory.

The generation of Fe(II) from Fe(III) is the rate-limiting step in the heterogeneous Fenton reaction, and accelerating this step is critical for enhancing the reaction efficiency and also the subject of extensive studies. In this work, the oxidized multi-walled carbon nanotubes (CNTs) were coupled with ferrihydrite (Fh) to synthesize novel and highly efficient heterogeneous Fenton catalysts (CNTs/Fh). Interestingly, the calculated apparent rate constants by 3%CNTs/Fh could reach ∼7.1 times as high as that by Fh, well in agreement with the accelerated decomposition rate of H2O2, as well as the enhanced generation rate of Fe(II) and hydroxyl radicals in the CNTs/Fh system. The density functional theory calculations and the cyclic voltammograms curves both well indicated that the Fe(III)/Fe(II) redox cycling on CNTs/Fh could be significantly enhanced during the Fenton reaction, from both dynamic (accelerating the electron transfer from H2O2 to Fh) and thermodynamic (lowering Fe(III)/Fe(II) redox potential) aspects.

The leader-follower formation control analysis for multiple quad-rotor systems is investigated in this paper. To achieve predefined formation in the three-dimensional air space ($x,y$ and $z$), a novel local tracking control law and a distributed observer are obtained. The local tracking control law starts with finding a bounded continuous yet greater-than-zero control in $z$, based on which following a feedback linearization controls derived for errors associated with $x$ and $y$. The distributed observer achieves position coordination among followers, though there are only partial followers can know the leader's states and only neighboring communication is available. Simulation results validate the proposed formation scheme.

Yan L, Zhang Z, Yin X, Li Y. Onco Targets Ther. 2020;13:2449–2458. The Editor and Publisher of OncoTargets and Therapy wish to retract the following article. We were notified by another publisher that they had received a submission which had a high degree of similarity to the published article. Our investigation determined the other publisher received their submission while the published article was still under consideration at OncoTargets and Therapy. There were no shared authors or affiliations between either version. Both versions appeared to share identical images used in Figures 1A, 1C, 1D, 1E, 1F; Figures 2A, 2C and Figures 3C, 3D. There was also a high degree of similarity in the text used for both versions and both versions shared identical references. Despite several attempts, the authors were unable to respond to our queries in a timely manner and the editor determined that the findings of the study could no longer be considered valid and requested for the article to be retracted. Our decision-making was informed by our policy on publishing ethics and integrity and the COPE guidelines on retraction. The retracted article will remain online to maintain the scholarly record, but it will be digitally watermarked on each page as “Retracted”. This retraction relates to this paper

This paper has been retracted.Lixia Yan, 1,* Ze Zhang, 1,* Xingmei Yin, 1 Yongxia Li 2 1Department of Breast and Thyroid Surgery, Dongying People’s Hospital, Dongying, Shandong 257091, People’s Republic of China; 2Department of Stomatology and Eye, Dongying People’s Hospital, Dongying, Shandong 257091, People’s Republic of China*These authors contributed equally to this workCorrespondence: Xingmei YinDepartment of Breast and Thyroid Surgery, Dongying People’s Hospital, Dongying People’s Hospital, No. 317, Nanyi Road, Dongying, Shandong 257091, People’s Republic of ChinaTel +86-15505462059Fax +86-546-8901211Email zhong33669558@163.comPurpose: To investigate the association between the lncRNA NEAT1 and breast cancer, and to determine the influence of NEAT1 on regulation of other signaling molecules in breast cancer.Methods: In the present study, we measured levels of the lncRNA NEAT1 in 106 breast cancer patients and in a human breast cancer cell line by qRT-PCR. The correlation between NEAT1 expression and patients’ clinical characteristics was analyzed with in-house and TCGA data. We used cellular functioning assays and cell immunofluorescence assay to evaluate the role of NEAT1 and its target molecules in proliferation, invasion and migration in breast cancer. We used Western blotting to explore possible targets of NEAT1 and a subcellular fractionation assay to locate NEAT1 expression.Results: NEAT1 was overexpressed in breast cancer tissue and also closely related to advanced clinical stages and positive lymph node metastases. NEAT1 levels were also tightly correlated to prognosis for breast cancer patients in survival analyses. Cellular function assays revealed that downregulation of NEAT1 could inhibit breast cancer cell viability, invasion and migration. Western blotting revealed down-regulation of CBX7 and up-regulation of RTCB following NEAT1 inhibition. Based on the cytoplasmic a

Herein, we have reported an effective strategy to solve the rate-limiting step in a heterogeneous Fenton reaction, i.e., the generation of Fe(II) from Fe(III), which also inevitably consumes a large amount of H2O2. For the first time, a novel heterogeneous photo-Fenton catalyst - Ag/AgBr/ferrihydrite (Ag/AgBr/Fh) was successfully developed by combing AgBr with ferrihydrite (Fh) and then in-situ generating Ag nanoparticles on the surface of AgBr/Fh. This strategy can introduce photo-generated electrons from semiconductor-based plasmonic photocatalysts to heterogeneous Fenton catalysts and significantly increase the efficiency to degrade contaminants. The presence of both AgBr and Ag nanoparticles was proved by a combination of structural characterization studies (i.e., XRD, SEM, TEM, and XPS). Under visible light irradiation, the generated Fe(II) on the samples and the degradation rate constants of bisphenol A (BPA) followed the same order: Ag/AgBr/Fh > AgBr/Fh > Fh, which could be attributed to the accelerated reduction of Fe(III) to Fe(II) by the photo-generated electrons from AgBr and Ag nanoparticles, and also profit from the strong electron trapping ability of Ag nanoparticles in separating the electron-hole pairs of AgBr. The Ag/AgBr/Fh system could produce more hydroxyl radicals (•OH), and its catalytic performance was less affected by decreasing H2O2 concentration, which suggested a more efficient utilization of H2O2. The Ag/AgBr/Fh system exhibits relatively high photo-Fenton reactivity even at neutral pH. In addition, a much lower Fe3+ dissolution indicates that a large portion of the contribution is from the direct heterogeneous Fenton reaction in this system.