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Number of results: 3
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Abstract

In this study, the modified Sauer cavitation model and Kirchhoff-Ffowcs Williams and Hawkings (K-FWH) acoustic model were adopted to numerically simulate the unsteady cavitation flow field and the noise of a threedimensional NACA66 hydrofoil at a constant cavitation number. The aim of the study is to conduct and analyze the noise performance of a hydrofoil and also determine the characteristics of the sound pressure spectrum, sound power spectrum, and noise changes at different monitoring points. The noise change, sound pressure spectrum, and power spectrum characteristics were estimated at different monitoring points, such as the suction side, pressure side, and tail of the hydrofoil. The noise characteristics and change law of the NACA66 hydrofoil under a constant cavitation number are presented. The results show that hydrofoil cavitation takes on a certain degree of pulsation and periodicity. Under the condition of a constant cavitation number, as the attack angle increases, the cavitation area of the hydrofoil becomes longer and thicker, and the initial position of cavitation moves forward. When the inflow velocity increases, the cavitation noise and the cavitation area change more drastically and have a superposition tendency toward the downstream. The novelty is that the study presents important calculations and analyses regarding the noise performance of a hydrofoil, characteristics of the sound pressure spectrum, and sound power spectrum and noise changes at different monitoring points. The article may be useful for specialists in the field of engineering and physics.
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Authors and Affiliations

He Xiaohui
1
Liu Zhongle
2
Yang Chao
1
Yuan Zhiyong
2

  1. Jiangnan Industry Group Co., Ltd., Wuyi Village, China
  2. Naval University of Engineering, Wuhan, China
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Abstract

Telomerase reverse transcriptase (TERT) vectors were transfected into bone marrow mesen- chymal stem cells (BMSCs) which were then cultured and selected to establish TERT-BMSC cell lines whilst sequencing BMSCs and TERT-BMSCs via transcriptome in this study to explore their regulatory mechanism and effect on osteogenic differentiation after TERT ectopic expres- sion in sheep BMSCs. After sequencing and analysing differential genes, PI3K/Akt signalling pathway related to osteogenic differentiation was investigated. Western blot was used before and after applying the PI3K/Akt signalling pathway inhibitor LY294002 to detect protein expression levels of AKT and p-AKT. On the twenty-first day of osteogenic differentiation, RT-qPCR and Western blot were used to detect mRNA and protein expression levels of RUNX2 and OPN and alizarin red staining was utilised to analyse calcium salt deposition. Results showed that pro- tein expression levels of AKT and p-AKT were significantly up-regulated, mRNA and protein expression levels of RUNX2 and OPN increased and calcium salt deposition increased after ectopic expression of TERT. After applying LY294002, the protein expression of AKT and p-AKT was down-regulated, mRNA and protein expression levels of RUNX2 and OPN were reduced and calcium salt deposition was reduced. These results confirmed the stable integration and expression of the exogenous TERT gene in BMSCs to promote the differentiation of BMSC osteoblasts, which may be mediated by the PI3K/Akt signalling pathway.

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Authors and Affiliations

X. Zhu
L. Zhou
Z. Liu
X. Chen
L. Wei
Z. Zhang
Y. Liu
Y. Zhu
Y. Wang
ORCID: ORCID
X. Yang
Y. Han
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Abstract

The article discusses views and the ideological evolution carried out by Pitirim Alexandrovich Sorokin, a Russian-American sociologist, philosopher and political activist. Influenced by his observations of the events of 1917, Sorokin radically reformulated his opinions about Marx and Marxism which resulted in his espousing of a traditionalist and anti-revolutionary position. He still shared with Marx his negative diagnosis of the modern world, but proposed a different solution as a remedy. His solution was a purification of the idea of equality by liberating it from reductive materialism. Nevertheless Sorokin’s concept of spiritual equality was as utopian as Marx’s. He presented his ideas in a littleknown novel titled: Предтеча (or Прачечная человеческих душ – ‘предтеча’ means ‘ancestor’ and is commonly referred to John the Baptist). This work is a signal for Sorokin’s denial of Marx’s ideas and his revolutionary zeal.

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Authors and Affiliations

Marek Jedliński
ORCID: ORCID

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