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ON THE 2k-TH POWER MEAN VALUE OF THE GENERALIZED QUADRATIC GAUSS SUMS
He, Yanfeng,Zhang, Wenpeng Korean Mathematical Society 2011 대한수학회보 Vol.48 No.1
The main purpose of this paper is using the elementary and analytic methods to study the properties of the 2k-th power mean value of the generalized quadratic Gauss sums, and give two exact mean value formulae for k = 3 and 4.
On the 2k-th power mean value of the generalized quadratic Gauss sums
Yanfeng He,Wenpeng Zhang 대한수학회 2011 대한수학회보 Vol.48 No.1
The main purpose of this paper is using the elementary and analytic methods to study the properties of the 2k-th power mean value of the generalized quadratic Gauss sums, and give two exact mean value formulae for k=3 and 4.
Yanfeng Zhou,Dan Wang,Jianyuan He,Weifang Chen,Rupeng Zhu 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.11
Systematic experimental studies of disc springs are sparse. In this paper, quasistatic and dynamic compression experiments are performed on a single disc spring under both symmetric and asymmetric frictional conditions for different series of disc springs. On this basis, multiple disc springs stacked in parallel are also investigated. The full-range load-displacement curves of disc springs under quasi-static and dynamic compression are obtained and compared with the theoretical values, and the limitations of the existing analytical solutions are pointed out. The analysis revealed that frictional conditions of contact boundaries greatly affect the damping of disc springs. As the compression frequency increases, the damping of the disc spring gradually increases and finally remains stable. When the disc springs are stacked in parallel, the stiffness relationship can be approximated as conforming to the law of parallel connection, but the damping increases significantly due to the introduction of friction between internal contact surfaces.
Guo, Zhixin,Wang, Yanfeng,Feng, Xue,Bao, Chaogetu,He, Qiburi,Bao, Lili,Hao, Huifang,Wang, Zhigang Asian Australasian Association of Animal Productio 2016 Animal Bioscience Vol.29 No.11
Mammalian target of rapamycin complex 1 (mTORC1) is a central regulator of cell growth and metabolism and is sufficient to induce specific metabolic processes, including de novo lipid biosynthesis. Elongation of very-long-chain fatty acids 1 (ELOVL1) is a ubiquitously expressed gene and the product of which was thought to be associated with elongation of carbon (C) chain in fatty acids. In the present study, we examined the effects of rapamycin, a specific inhibitor of mTORC1, on ELOVL1 expression and docosahexaenoic acid (DHA, C22:6 n-3) synthesis in bovine mammary epithelial cells (BMECs). We found that rapamycin decreased the relative abundance of ELOVL1 mRNA, ELOVL1 expression and the level of DHA in a time-dependent manner. These data indicate that ELOVL1 expression and DHA synthesis are regulated by mTORC1 in BMECs.
Sorption enhancement of TBBPA from water by fly ash-supported nanostructured g-MnO2
Yun Zhang,Lingyun Jing,Xinghua He,Yanfeng Li,Xin Ma 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
Tetrabromobisphenol A (TBBPA), an emerging contaminant, has been detected frequently in theenvironmental media. This study reports the adsorption kinetics, equilibrium and thermodynamics ofTBBPA on fly ash modified by nanostructured MnO2 (FA@nM). The resulting nano-adsorbent wascharacterized by means of the Fourier transform infrared spectra (FT-IR), XRD and scanning electronmicroscope (SEM). The adsorption results showed that the equilibrium adsorption capacity has beensignificantly improved by increasing the initial TBBPA concentration and contact time. While a largereduction of TBBPA uptake was observed in alkaline conditions and at high temperatures and ionicstrength. The equilibrium between TBBPA and FA@nM was achieved in approximately 40 min withremoval of 98% of the TBBPA. The sorption kinetics were well described by a pseudo-first-order ratemodel, while both Langmuir and Freundlich models described the sorption isotherms well at 298 K. Thermodynamic parameters suggested that the adsorption of TBBPA is exothermic and spontaneous atthe temperatures studied. As fly ash is a low-cost material that is often available on-site, it offers aninteresting alternative to high-cost advanced wastewater treatment systems for removing such organicpollutants.