HYBRID MEAN VALUE OF GENERALIZED BERNOULLI NUMBERS, GENERAL KLOOSTERMAN SUMS AND GAUSS SUMS

Liu, Huaning,Zhang, Wenpeng Korean Mathematical Society 2007 대한수학회지 Vol.44 No.1

The main purpose of this paper is to use the properties of primitive characters, Gauss sums and Ramanujan's sum to study the hybrid mean value of generalized Bernoulli numbers, general Kloosterman sums and Gauss sums, and give two asymptotic formulae.

Sinapic acid(SA) attenuated the letrozole-induced ovarian fibrosis and modulated the abolic disturbances in polycystic ovary syndrome(PCOS) SD rat

Huan Lan,Zhewen Dong,Yaqi Wu,Chaojie Chong,Zhiqiang Liu,Wanying Li,Zixian Wang,Junyang Liu,Qi Qi Pang,Jia-Le Song,Yanyuan Zhou 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10

This study investigated the antifibrotic effects of SA on ovarian fibrosis in letrozole-induced PCOS in rats. SA treatment restored letrozole-induced alterations in the body weight (BW), relative weights of the ovaries, and visceral adipose tissues. Histological observation showed that SA reduced the number of atretic follicles, cystic follicles, and fibrosis of the ovaries in PCOS rats. SA treatment also modulated the serum levels of sex hormones, which decreased the luteinizing hormone (LH), and testosterone (T) and increased the follicle-stimulating hormone (FSH) in PCOS rats. Administration of SA reduced letrozole-induced metabolic dysfunction by decreasing the serum levels of triglyceride (TG) and total cholesterol (TC) and increasing the levels of high-density lipoprotein cholesterol (HDL-C) in PCOS rats. Finally, SA treatment appeared to increase the activity of PPAR-γ, reduce the activation of the TGF-β1/Smad pathway, and reduce the collagen I, α-SMA and CTGF levels in the ovaries of the PCOS rats. Our results demonstrated that SA significantly ameliorated ovarian fibrosis and abolic disturbances in the letrozole-induced PCOS rats.

Study on High Resistance Distance Relay in Directly Earth System

Liu, Huan-Zhang,Li, Ying-Hong The Korean Institute of Electrical Engineers 2011 The Journal of International Council on Electrical Vol.1 No.4

The coverage of transition resistance and the avoidance of load impedance is in essence a contradiction for distance protection. It's evident from the impedance plane that the requirement to avoid the load impedance results in that the action space of the distance relay is greatly limited, which accordingly reduces the ability of the relays to cover the transition resistance. In fact, there are some limitations to analyze the distance relays in the impedance plane. It would be better in the voltage plane. The three elements of distance relay in the voltage plane are the polarization voltage, operation voltage and operation characteristic, of which the polarization voltage is most important. The relay could ideally select pre-fault voltage as polarization voltage, while it practically employs the positive voltage. The difference between the two kinds of polarization voltage is negligible in the state of low impedance ground fault, while significant in the state of high impedance ground fault. Thus, this paper uses the memory and the non-fault phase parameters to gain the pre-fault voltage, that is, the new polarization voltage, and puts forward a new self-adaptive high impedance ground distance relay.

Multi-strategy structural damage detection based on included angle of vectors and sparse regularization

Huan-Lin Liu,Ling Yu,Ziwei Luo,Zexiang Chen 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.75 No.4

Recently, many structural damage detection (SDD) methods have been proposed to monitor the safety of structures. As an important modal parameter, mode shape has been widely used in SDD, and the difference of vectors was adopted based on sensitivity analysis and mode shapes in the existing studies. However, amplitudes of mode shapes in different measured points are relative values. Therefore, the difference of mode shapes will be influenced by their amplitudes, and the SDD results may be inaccurate. Focus on this deficiency, a multi-strategy SDD method is proposed based on the included angle of vectors and sparse regularization in this study. Firstly, inspired by modal assurance criterion (MAC), a relationship between mode shapes and changes in damage coefficients is established based on the included angle of vectors. Then, frequencies are introduced for multi-strategy SDD by a weighted coefficient. Meanwhile, sparse regularization is applied to improve the ill-posedness of the SDD problem. As a result, a novel convex optimization problem is proposed for effective SDD. To evaluate the effectiveness of the proposed method, numerical simulations in a planar truss and experimental studies in a six-story aluminum alloy frame in laboratory are conducted. The identified results indicate that the proposed method can effectively reduce the influence of noises, and it has good ability in locating structural damages and quantifying damage degrees.

PREPARATION AND CHARACTERIZATION OF SILVER NANOPARTICLES/CARBON NANOFIBERS VIA ELECTROSPINNING WITH RESEARCH ON THEIR CATALYTIC PROPERTIES

Huan Liu,Jie Bai,Chunping Li,Shan Wang,Yarong Huang,QI WANG,WEIYAN SUN 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.3

Ag nanoparticles (Ag NPs) embedded carbon nano¯bers (CNFs) were prepared by a new routewhich included chemical reaction process, electrospinning and calcination technique. The mor-phology and structure of the composite nano¯bers were investigated by scanning electron mi-croscopy, energy dispersive X-ray spectroscopy, transmission electron microscopy and X-raydi®raction. It indicated that Ag NPs were uniformly distributed in the CNFs. This e®ectivesynthesis method can be used to prepare other composite nano¯bers with functionality. The AgNPs/CNFs that served as supported catalysts were used in the styrene epoxidation by TBHP. The Ag NPs/CNFs catalyst showed its highly catalytic activity for the epoxidation of styrene(conversion: 40.6%, SO selectivity: 35.9%). This kind of composite nano¯ber membrane wasproved e®ectively catalytic activity and recycled easily in the styrene epoxidation.

On the mean values of Dedekind sums and Hardy sums

Huaning Liu 대한수학회 2009 대한수학회지 Vol.46 No.1

For a positive integer $k$ and an arbitrary integer $h$, the classical Dedekind sums $s(h, k)$ is defined by <수식> where <수식>J. B. Conrey et al proved that <수식> For m≥2, C. Jia reduced the error terms to O(k^{2m-1}). While for m=1, W. Zhang showed <수식> In this paper we give some formulae on the mean value of the Dedekind sums and and Hardy sums, and generalize the above results. For a positive integer $k$ and an arbitrary integer $h$, the classical Dedekind sums $s(h, k)$ is defined by <수식> where <수식>J. B. Conrey et al proved that <수식> For m≥2, C. Jia reduced the error terms to O(k^{2m-1}). While for m=1, W. Zhang showed <수식> In this paper we give some formulae on the mean value of the Dedekind sums and and Hardy sums, and generalize the above results.

Abdominal-Deformation Measurement for a Shape-Flexible Mannequin Using the 3D Digital Image Correlation

Liu, Huan,Hao, Kuangrong,Ding, Yongsheng Korean Institute of Information Scientists and Eng 2017 Journal of Computing Science and Engineering Vol.11 No.3

In this paper, the abdominal-deformation measurement scheme is conducted on a shape-flexible mannequin using the DIC technique in a stereo-vision system. Firstly, during the integer-pixel displacement search, a novel fractal dimension based on an adaptive-ellipse subset area is developed to track an integer pixel between the reference and deformed images. Secondly, at the subpixel registration, a new mutual-learning adaptive particle swarm optimization (MLADPSO) algorithm is employed to locate the subpixel precisely. Dynamic adjustments of the particle flight velocities that are according to the deformation extent of each interest point are utilized for enhancing the accuracy of the subpixel registration. A test is performed on the abdominal-deformation measurement of the shape-flexible mannequin. The experiment results indicate that under the guarantee of its measurement accuracy without the cause of any loss, the time-consumption of the proposed scheme is significantly more efficient than that of the conventional method, particularly in the case of a large number of interest points.

Impact of selected fungi from an artificial diet on the growth and development of Drosophila suzukii (Diptera: Drosophilidae)

Huan-Huan Gao,Nan Xu,Hao Chen,Qian Liu,Qian-Yun Pu,Dong-Yun Qin,Yi-Fan Zhai,Yi Yu 한국응용곤충학회 2017 Journal of Asia-Pacific Entomology Vol.20 No.1

Drosophila suzukii (Diptera: Drosophilidae) is one of the very few Drosophila species which are able to lay eggs and feed on healthy ripening fruit. Adults and larvae are all able to obtain the nutrition in the decaying food, which will generate many microorganisms. However, the relationship between D. suzukii and microorganism is poorly understood. In this study, 13 species of fungi were identified in an artificial diet fed by D. suzukii. Short-term and continuously life table experiments were conducted to determine the impact of three of these fungus species including Geotrichum candidum, Talaromyces minioluteus and Actinomucor elegans on the growth and development of Drosophila suzukii. Results revealed that, compared to the control, G. candidum, T.minioluteus and A. elegans increased the mortality of D. suzukii adults in the short time, while extended the developmental time of pupal D. suzukii by 18.00%, 16.22% and 26.44%, respectively in the life table experiment. T. minioluteus reduced the total longevity of D. suzukii by 15.52%, while A. elegans enhanced the total longevity by 25.96%. G. candidum and A. elegans increased the fecundity bymore than two folds. T. minioluteus elongated the mean generation time (T) by 31.34%, whereas G. candidum shortened it by 15.26% but increased the net reproductive rate (R0) by 217.76%, intrinsic rate of increase (r) by 88.89% and finite rate of increase (λ) by 9.17%. It was concluded that G. candidumand A. elegans significantly had the beneficial effect on the growth and reproduction of D. suzukii, however, T. minioluteus had the negative effect on D. suzukii. Our results could provide a new integrated pest management strategy for D. suzukii which would be discussed in this study.

Characterization of the Parameters for the Refining Intensity in Terms of Performance

Huan Liu,Jixian Dong,Hui Jing,Xiya Guo,Lijie Qiao 한국펄프·종이공학회 2019 펄프.종이기술 Vol.51 No.2

Refining intensity is typically used to measure the efficiency of refining in the pulp and paper industry, and the refining intensity is difficult to analyze due to the various parameters influencing it. In this paper, the previously published refining intensities of a disc refiner were analyzed, and the characterization parameters were proposed. Based on the bar interactions, the refining intensity was established using theoretical derivation. The cut edge length (CEL), the CEL-based characterization parameters and bar interactions (BI) characterization parameters were used to show that the CEL directly reflected the number of bar interaction points, but it had no direct relationship with the bar interaction area (BIA) and bar interaction length (BIL). By analyzing the relationship between the different refining intensities and the properties of the fibers or pulp, it could be concluded that the specific refining energy (SRE) better reflected the variations in the beating degree of the pulp during the refining process compared with the specific surface load (SSL) and BI-based refining intensities. Also, the intensity based on the bar interaction length (BIL) can better characterize the changes in the average fiber length. However, all the intensities analyzed in this paper do not comprehensively describe the refining process and cannot predict all the parameters of the pulp and fibers but only partly characterize their properties. Therefore, further studies are required to establish a more comprehensive and precise measure of refining intensity.

Rhamnocitrin (Rha) attenuates ovarian fibrosis in rats with letrozole-induced experimental polycystic ovary syndrome (PCOS)

Huan Lan,Zhewen Dong,Yaqi Wu,Chaojie Chong,Zhiqiang Liu,Wanying Li,Zixian Wang,Junyang Liu,Qi Qi Pang,Jia-Le Song,Yanyuan Zhou 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10

In this study, we investigated the antifibrotic effects of Rha on letrozole-induced PCOS in rats. Rha treatment restored letrozole-induced alterations in the body weight (BW), relative weights of the ovaries, and relative weights of uterine and visceral adipose tissues. Histological observation showed that Rha reduced the number of atretic follicles, cystic follicles, and fibrosis of the ovaries in the PCOS rats. Administration of Rha reduced letrozole-induced metabolic dysfunction by decreasing the serum levels of TG and TC and increasing the levels of HDL-C in the PCOS rats. Rha treatment also modulated the serum levels of sex hormones, which decreased the LH, E2 and T and increased the FSH in PCOS rats. Finally, Rha treatment appeared to increase the activity of PPAR-γ, reduce the activation of the TGF-β1/Smad pathway, and reduce the collagen I, α-SMA and CTGF levels in the ovaries of the PCOS rats. Our results demonstrated that Rha significantly ameliorated metabolic disturbances and ovarian fibrosis in the letrozole-induced PCOS rats. Rha may be an effective compound in preventing ovarian fibrosis in the future.