Investigation on the influence of number of blades on flow-induced noise optimization design of a centrifugal pump

Chang Guo,Feiran Lv,Ming Gao,Wei Wei,Shen Cheng 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.10

Aiming at the quiet centrifugal pump design, the effect of number of blades on the flow-induced noise is explored. The results show that the sound pressure fluctuation is generated due to the influence of sound source fluctuation and adjacent spatial locations, and the fluctuation ranges of sound source and sound pressure at the same location change little with the change in the number of blades. Additionally, the total sound source intensity increases along the flow direction in the volute under the same rotational radius, while it increases slowly and even decreases near the outlet of the impeller, which causes similar evolution characteristics of noise. Besides, the volume-weighted standard deviation of sound source (V-STDSS) is proposed to characterize the overall sound intensity, and the V-STDSS proportion of impeller is more than 0.6. The impeller with an even number of blades has a better sound performance, while the noise induced by volute with an odd number of blades is lower. Generally, the centrifugal pumps with an even number of blades have a better sound performance. This research can guide the noise control and optimization design of centrifugal pumps.

An extremum method for bending-wrinkling predictions of inflated conical cantilever beam

Changguo Wang,Zhenyong Du,Huifeng Tan 국제구조공학회 2013 Structural Engineering and Mechanics, An Int'l Jou Vol.46 No.1

An extremum method is presented to predict the wrinkling characteristics of the inflated cone in bending. The wrinkling factor is firstly defined so as to obtain the wrinkling condition. The initial wrinkling location is then determined by searching the maximum of the wrinkling factor. The critical wrinkling load is finally obtained by determining the ratio of the wrinkling moment versus the initial wrinkling location. The extremum method is proposed based on the assumption of membrane material of beam wall, and it is extended to consider beam wall with thin-shell material in the end. The nondimensional analyses show that the initial wrinkling location is closely related to the taper ratio. When the taper ratio is higher than the critical value, the initial wrinkles will be initiated at a different location. The nondimensional critical wrinkling load nonlinearly increases as the taper ratio increases firstly, and then linearly increases after the critical taper ratio. The critical taper ratio reflects the highest load-carrying efficiency of the inflated cone in bending, and it can be regarded as a measure to optimize the geometry of the inflated cone. The comparative analysis shows fairly good agreement between analytical and numerical results. Over the whole range of the comparison, the mean differences are lower than 3%. This gives confidence to use extremum method for bending-wrinkling analysis of inflated conical cantilever beam.

Parallel Implementation of the Recursive Least Square for Hyperspectral Image Compression on GPUs

( Changguo Li ) 한국인터넷정보학회 2017 KSII Transactions on Internet and Information Syst Vol.11 No.7

Compression is a very important technique for remotely sensed hyperspectral images. The lossless compression based on the recursive least square (RLS), which eliminates hyperspectral images` redundancy using both spatial and spectral correlations, is an extremely powerful tool for this purpose, but the relatively high computational complexity limits its application to time-critical scenarios. In order to improve the computational efficiency of the algorithm, we optimize its serial version and develop a new parallel implementation on graphics processing units (GPUs). Namely, an optimized recursive least square based on optimal number of prediction bands is introduced firstly. Then we use this approach as a case study to illustrate the advantages and potential challenges of applying GPU parallel optimization principles to the considered problem. The proposed parallel method properly exploits the low-level architecture of GPUs and has been carried out using the compute unified device architecture (CUDA). The GPU parallel implementation is compared with the serial implementation on CPU. Experimental results indicate remarkable acceleration factors and real-time performance, while retaining exactly the same bit rate with regard to the serial version of the compressor.

Lossless Compression of Hyperspectral Images Using Three-Stage Prediction with Adaptive Search Threshold

Changguo Li,Ke Guo 보안공학연구지원센터(IJSIP) 2014 International Journal of Signal Processing, Image Vol.7 No.3

An extremum method for bending-wrinkling predictions of inflated conical cantilever beam

Wang, Changguo,Du, Zhenyong,Tan, Huifeng Techno-Press 2013 Structural Engineering and Mechanics, An Int'l Jou Vol.46 No.1

An extremum method is presented to predict the wrinkling characteristics of the inflated cone in bending. The wrinkling factor is firstly defined so as to obtain the wrinkling condition. The initial wrinkling location is then determined by searching the maximum of the wrinkling factor. The critical wrinkling load is finally obtained by determining the ratio of the wrinkling moment versus the initial wrinkling location. The extremum method is proposed based on the assumption of membrane material of beam wall, and it is extended to consider beam wall with thin-shell material in the end. The nondimensional analyses show that the initial wrinkling location is closely related to the taper ratio. When the taper ratio is higher than the critical value, the initial wrinkles will be initiated at a different location. The nondimensional critical wrinkling load nonlinearly increases as the taper ratio increases firstly, and then linearly increases after the critical taper ratio. The critical taper ratio reflects the highest load-carrying efficiency of the inflated cone in bending, and it can be regarded as a measure to optimize the geometry of the inflated cone. The comparative analysis shows fairly good agreement between analytical and numerical results. Over the whole range of the comparison, the mean differences are lower than 3%. This gives confidence to use extremum method for bending-wrinkling analysis of inflated conical cantilever beam.

중국 조선족 사회위상 정립의 필요성과 과제 - 한락연 연구를 중심으로 -

전창국 ( Quan Changguo ) 한국다문화 디아스포라학회 2020 다문화와 디아스포라연구 Vol.16 No.-

북경에서 2017년 10월 설립된 한락연 연구회는 국가적 차원에서 소수민족으로서 중국사회의 공헌에 대한 조선족의 기여를 점검하는 계기가 되었고 그 영향으로 조선족학계를 비롯한 전국 각지에서 범민족적인 홍보와 연구 활동이 활발히 진행되고 있다. 한락연 연구가 활발하게 된 배경은 한락연이 중국에서 “피카소”로 불리는 저명한 미술가의 신분 외에 조선인으로 공산당에 가입 1인자이고 중국 동북지방 기층당 조직 건설의 주도적인 역할을 하여 반파시즘 노동계급의 혁명자로 중국사회에 평가 받고 있다는 것이다. 따라서 한락연 연구는 조선족의 사회위상을 정립할 수 있는 플랫폼을 구축할 수 있는 기반을 마련하였다. Founded in October 2017 in Beijing, the Han Le Ran, Research Society was an opportunity to examine the contribution of the Korean-Chinese to the contribution of Chinese society as a minority at the national level. As a result of this, pan-ethnic public relations and research activities are being actively conducted in various parts of the country, including the Korean-Chinese academic community. The background behind the study of Han Le Ran was an eminent artist named “Picasso” in China. In addition, He was the first Korean-Chinese to join the Communist Party and played a leading role in the construction of the ruling party in Northeastern China. Forming a research group to study his historical role was that he provided a platform to establish the social status of the Korean-Chinese.

Identification and expression analysis of WRKY transcription factor genes in response to fungal pathogen and hormone treatments in apple (Malus domestica)

Shuai Lui,Changguo Luo,Longming Zhu,Renhe Sha,Shenchun Qu,Binhua Ca,Sanhong Wang 한국식물학회 2017 Journal of Plant Biology Vol.60 No.2

The WRKY family, a large family of transcription factors (TFs) found in higher plants, plays central roles in many aspects of biological processes and adaption to environment. However, little information is available on this family in apple (Malus domestica). In the present study, a total of 119 candidate WRKY genes in apple genome were identified and classified into three main groups (Group I–III) based on the structure of the conserved domains. Each group or subgroup showed similar exon–intron structures and motif compositions. The evolution analysis showed that 44 MdWRKY genes clustered into 20 intensive regions (<100 kb) and 78 MdWRKY formed 85 pairs of collinear relationships, suggesting that both tandem and segmental duplications played an important role in the evolution and diversification of the WRKY gene family in apple. Furthermore, the expression of the MdWRKY genes in apple leaves in response to biotic stress (Alternaria alternate) and hormone treatments [salicylic acid (SA), methyl jasmonate (MeJA) and ethephon] was examined by using RNA-seq and qRT-PCR. The results showed that 63 MdWRKY genes had differential expression in their transcript abundance in response to Alternaria alternata apple pathotype infection. Moreover, most pathogen responsive MdWRKY genes were also changed significantly when apple leaves were treated by SA, MeJA or ethephon plant growth regulations, suggesting an interaction between SA, JA and ethylene (Eth) hormone signaling under biotic stress. This work may provide the basis for future studies of the genetic modification of WRKY genes for pathogen resistance in apple.

Lossless Compression for Hyperspectral Images based on Adaptive Band Selection and Adaptive Predictor Selection

( Fuquan Zhu ),( Huajun Wang ),( Liping Yang ),( Changguo Li ),( Sen Wang ) 한국인터넷정보학회 2020 KSII Transactions on Internet and Information Syst Vol.14 No.8

With the wide application of hyperspectral images, it becomes more and more important to compress hyperspectral images. Conventional recursive least squares (CRLS) algorithm has great potentiality in lossless compression for hyperspectral images. The prediction accuracy of CRLS is closely related to the correlations between the reference bands and the current band, and the similarity between pixels in prediction context. According to this characteristic, we present an improved CRLS with adaptive band selection and adaptive predictor selection (CRLS-ABS-APS). Firstly, a spectral vector correlation coefficient-based k-means clustering algorithm is employed to generate clustering map. Afterwards, an adaptive band selection strategy based on inter-spectral correlation coefficient is adopted to select the reference bands for each band. Then, an adaptive predictor selection strategy based on clustering map is adopted to select the optimal CRLS predictor for each pixel. In addition, a double snake scan mode is used to further improve the similarity of prediction context, and a recursive average estimation method is used to accelerate the local average calculation. Finally, the prediction residuals are entropy encoded by arithmetic encoder. Experiments on the Airborne Visible Infrared Imaging Spectrometer (AVIRIS) 2006 data set show that the CRLS-ABS-APS achieves average bit rates of 3.28 bpp, 5.55 bpp and 2.39 bpp on the three subsets, respectively. The results indicate that the CRLS-ABS-APS effectively improves the compression effect with lower computation complexity, and outperforms to the current state-of-the-art methods.

Differential Expression of PPARγ, FASN, and ACADM Genes in Various Adipose Tissues and Longissimus dorsi Muscle from Yanbian Yellow Cattle and Yan Yellow Cattle

Ji, Shuang,Yang, Runjun,Lu, Chunyan,Qiu, Zhengyan,Yan, Changguo,Zhao, Zhihui Asian Australasian Association of Animal Productio 2014 Animal Bioscience Vol.27 No.1

The objective of this study was to investigate the correlation between cattle breeds and deposit of adipose tissues in different positions and the gene expressions of peroxisome proliferator-activated receptor gamma ($PPAR{\gamma}$), fatty acid synthase (FASN), and Acyl-CoA dehydrogenase (ACADM), which are associated with lipid metabolism and are valuable for understanding the physiology in fat depot and meat quality. Yanbian yellow cattle and Yan yellow cattle reared under the same conditions display different fat proportions in the carcass. To understand this difference, the expression of $PPAR{\gamma}$, FASN, and ACADM in different adipose tissues and longissimus dorsi muscle (LD) in these two breeds were analyzed using the Real-time quantitative polymerase chain reaction method (qRT-PCR). The result showed that $PPAR{\gamma}$ gene expression was significantly higher in adipose tissue than in LD in both breeds. $PPAR{\gamma}$ expression was also higher in abdominal fat, in perirenal fat than in the subcutaneous fat (p<0.05) in Yanbian yellow cattle, and was significantly higher in subcutaneous fat in Yan yellow cattle than that in Yanbian yellow cattle. On the other hand, FASN mRNA expression levels in subcutaneous fat and abdominal fat in Yan yellow cattle were significantly higher than that in Yanbian yellow cattle. Interestingly, ACADM gene shows greater fold changes in LD than in adipose tissues in Yan yellow cattle. Furthermore, the expressions of these three genes in lung, colon, kidney, liver and heart of Yanbian yellow cattle and Yan yellow cattle were also investigated. The results showed that the highest expression levels of $PPAR{\gamma}$ and FASN genes were detected in the lung in both breeds. The expression of ACADM gene in kidney and liver were higher than that in other organs in Yanbian yellow cattle, the comparison was not statistically significant in Yan yellow cattle.

Effect of microencapsulation of egg yolk immunoglobulin Y by sodium alginate/chitosan/sodium alginate on the growth performance, serum parameters, and intestinal health of broiler chickens

Yuanming Jin,Haojie Lv,Mingzhu Wang,Chong-Su Cho,Jongsuh Shin,Lianhua Cui,Changguo Yan Asian Australasian Association of Animal Productio 2023 Animal Bioscience Vol.36 No.8

Objective: Egg yolk immunoglobulin (IgY) is an antibiotic alternative to prevent and fight intestinal pathogenic infections. This study aimed to investigate the effects of sodium alginate/chitosan/sodium alginate IgY microcapsules on the growth performance, serum parameters, and intestinal health of broiler chickens. Methods: One-day-old broilers (Ross 308) were divided into five treatments, each with 10 replicates of five chickens. The dietary treatments were maintained for 28 days and consisted of a basal diet (NC), basal diet + 500 mg chlortetracycline/kg diet (CH), basal diet + 50 mg non-microencapsulated IgY/kg diet (NM), basal diet + 600 mg low levels microencapsulated IgY/kg diet (LM), and basal diet + 700 mg high levels microencapsulated IgY/kg diet (HM). Results: Throughout the 28-day trial period, the NM, LM, HM, and CH groups increased average daily gain compared with the NC group (p<0.05), and the HM group reduced feed conversion ratio compared with the CH group (p<0.05). The LM and HM groups increased relative organ weights of thymus and spleen compared with the CH and NM groups (p<0.05). The HM group improved the duodenal, jejunal and ileum villi height (VH) and villus height to crypt depth ratio (VH:CD) compared with the CH and NM groups (p<0.05). Compared with the CH group, the HM group increased serum immunoglobulin (IgA), immunoglobulin G (IgG), superoxide dismutase, total antioxidant capacity, and glutathione peroxidase levels (p<0.05), and decreased serum malondialdehyde levels (p<0.05). Compared with the NC group, the NM, LM, HM, and CH groups reduced colonic Escherichia coli and Salmonella levels (p<0.05). and the HM group promoted the levels of lactic acid bacteria and bifidobacteria compared with the CH group (p<0.05). Conclusion: Microencapsulation could be considered as a way to improve the efficiency of IgY. The 700 mg high levels microencapsulated IgY/kg diet could potentially be used as an alternative to antibiotics to improve the immune performance and intestinal health, leading to better performance of broiler chickens.