Research and Development on the Fault Diagnosis System of Automatic Production Line Based on PROFIBUS

Shengyong Lei 보안공학연구지원센터 2014 International Journal of Control and Automation Vol.7 No.1

Numerical simulation of holes and inclusions using adaptive polygonal finite element method

Shengyong Ding,Guojian Shao,Ang Li,Jingbo Su,Hougai Shi 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.9

An adaptive polygonal finite element method using the techniques of cut-cell and quadtree refinement is presented for modeling holes and inclusions in 2-D solids. A mesh template is used to ensure the high-quality refined elements generated in quadtree refinement. By coupling the level set method, the polygonal computational mesh is directly extracted from the mesh template in every adaptive cycle. An error estimator based on recovery stress is devoted for adaptive purpose, which allows the mesh where it is needed is further refining. This method allows to model arbitrary shape holes and inclusions in arbitrary-geometry 2-D solid using the initial mesh of few rectangular elements, which considerably simplifies construction of the finite element model. And one curved boundary can be accurately represented though several steps of refinement. Numerical examples are solved and the obtained results are compared with reference solutions to show the simplicity and efficiency of the proposed method.

THE SUITABILITY OF MITOCHONDRIAL AND MICROSATELLITE DNA AS GENETIC TAGS TO ASSESS STOCK ENHANCEMENT OF Portunus trituberculatus

Shengyong Xu,Shanshan Cai,Xiumei Zhang,Ming Liu,Na Song,Jun Wang,Tianxiang Gao 한국수산과학회 양식분과 2015 한국수산과학회 양식분과 학술대회 Vol.2015 No.5

Batch Process Control, From Traditional Approaches to 2D Control

Yi Yang,Shengyong Mo,Furong Gao 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10

In batch process, it is very important to closed-loop control the key process variables in the quality insurance system. The early studies can be classed to the direct application of advanced continuous control strategies, such as adaptive control and feed-forward control, to deal with the inherent process nonlinear and time-varying characteristics. These control strategies does not make use of the repetitive nature of batch process. Recently, two-dimensional (2D) control strategy has been developed for batch processes control. It is an integration of iterative learning control and feed-back control to handle the repetitive uncertainty and non-repetitive uncertainty, respectively. Both simulation and experimental test results to injection molding, a typical batch process, have shown the effectiveness of the proposed control strategy.

A Techno-Economic Investigation of Wind Power Potential in Coastal Belt of Sindh: Preventing Energy Crisis in Pakistan

Bhagat Kalsoom,Ye Shengyong,Dai Chaohua,Lian Jingru,Bhayo M. Zubair 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.6

Pakistan has been facing an energy crisis for many years. Techno-economic analysis of wind power generation is carried out to meet energy demand. Wind data from 2016 to 2018 has been selected for a coastal site of Sindh, Pakistan. For this purpose, four distribution functions, namely Weibull, Gamma, Rayleigh, and Lognormal are used. These distribution functions are compared using the coeffi cient of determination (R 2 ) and root mean square error tests. Wind potential on a daily, monthly, yearly and seasonal basis is evaluated. In this regard, various turbine models are selected to estimate their power generation capacity. The assessment results for a hub height of 100 m shows the average wind speed for three years is 7.9 m/s with direction dominated between the West and Southwest. The most probable wind speed is 9.5 m/s having a maximum energy density of 455 kWh/m 2 in May. The maximum mean wind speed of 8.55 m/s is in the spring. The Weibull distribution function (k = 2.92 & C = 8.86 m/s) performs the best. The maximum capacity factor for Fuhrlander LLC WTU 3.0–120 is 55.49% and for Siemens SWT-3.15–142 is 55.22%. Likewise, the estimated lowest LCOE ($/1kWh) for Fuhrlander LLC WTU 3.0–120 and Siemens SWT-3.15–142 is $0.04016 and $0.04035 respectively. Thus, this site contains suitable technical and economic characteristics of the wind power plant.

Effects of Ruminal Infusion of Garlic Oil on Fermentation Dynamics, Fatty Acid Profile and Abundance of Bacteria Involved in Biohydrogenation in Rumen of Goats

Zhu, Zhi,Mao, Shengyong,Zhu, Weiyun Asian Australasian Association of Animal Productio 2012 Animal Bioscience Vol.25 No.7

This study aimed to investigate the effects of ruminal infusion of garlic oil (GO) on fermentation dynamics, fatty acid (FA) profile, and abundance of bacteria involved in biohydrogenation in the rumen. Six wethers fitted with ruminal fistula were assigned to two groups for cross-over design with a 14-d interval. Each 30-d experimental period consisted of a 27-d adaptation and a 3-d sample collection. Goats were fed a basal diet without (control) or with GO ruminal infusion (0.8 g/d). Ruminal contents collected before (0 h) and at 2, 4, 6, 8, and 10 h after morning feeding were used for fermentation analysis, and 0 h samples were further used for FA determination and DNA extraction. Garlic oil had no influence on dry matter intakes of concentrate and hay. During ruminal fermentation, GO had no effects on total VFA concentration and individual VFA molar proportions, whereas GO increased the concentrations of ammonia nitrogen and microbial crude protein (p<0.05). Compared with control, GO group took a longer time for total VFA concentration and propionate molar proportion to reach their respective maxima after morning feeding. The ratio of acetate to propionate in control reduced sharply after morning feeding, whereas it remained relatively stable in GO group. Fatty acid analysis showed that GO reduced saturated FA proportion (p<0.05), while increasing the proportions of C18, t11-18:1 (TVA), c9,t11-conjugated linoleic acid (c9,t11-CLA), t10,c12-CLA, and polyunsaturated FA (p<0.05). The values of TVA/(c9,t11-CLA+TVA) and C18:0/(TVA+C18:0) were reduced by GO (p<0.05). Real-time PCR showed that GO tended to reduce Butyrivibrio proteoclasticus abundance (p = 0.058), whereas GO had no effect on total abundance of the Butyrivibrio group bacteria. A low correlation was found between B. proteoclasticus abundance and C18:0/(TVA+C18:0) (p = 0.910). The changes of fermentation over time suggested a role of GO in delaying the fermentation process and maintaining a relatively modest change of ruminal environment. The inhibitory effects of GO on the final step of biohydrogenation may be related to its antibacterial activity against B. proteoclasticus and other unknown bacteria involved.

Influence of quantum well states on the formation of Au–Pb alloy in ultra-thin Pb films

Kim, Jungdae,Qin, Shengyong,Zhang, Yi,Zhu, Wenguang,Shih, Chih-Kang Elsevier 2015 Surface science Vol.632 No.-

<P><B>Abstract</B></P> <P>The thickness dependence of Au–Pb alloy formation on Pb quantum films is studied via <I>in-situ</I> low-temperature scanning tunneling microscopy/spectroscopy (STM/S). 2D islands with moiré pattern are observed on top of Pb films when sub-monolayer Au is deposited onto Pb films at a substrate temperature of 90K. After annealing at up to 250K, various types of 2D islands, including Au–Pb alloys, are formed and show very different electronic structures. A detailed STS study suggests that the formation of these islands is directly related to the quantum well states (QWS) of Pb films, indicating quantum size effects (QSE) on the formation of Au–Pb alloys.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The thickness dependence of Au-Pb alloy formation on Pb quantum films is observed via <I>in-situ</I> STM/S. </LI> <LI> DFT shows Au can get into either subsurface interstitial sites or surface-layer substitutional sites of Pb(111) surface. </LI> <LI> 2D islands with moiré pattern are observed on Pb films when sub-monolayer Au is deposited onto Pb films at 90K. </LI> <LI> 2D islands with moiré pattern are transformed into various types of Au-Pb alloys after annealing at up to 250K. </LI> <LI> A STS study suggests that the formation of these Au-Pb alloys is directly related to the quantum well states of Pb films. </LI> </UL> </P>

Experimental Research and Finite Element Analysis on Structural Stability of Disc-Buckle Type Formwork Support

Jinfeng Dong,Haiqing Liu,Shengyong Xia,Yang Cheng,Ming Lei,Zimu Chen 한국강구조학회 2022 International Journal of Steel Structures Vol.22 No.3

In order to study the structural stability of the disc-buckle type formwork support, the multi-parameter experimental analysis of the disc-buckle type formwork support structure was carried out by using experimental and fi nite element analysis method. The infl uence parameters of working conditions, lift height, diagonal bracing and sleeve on the structural stability bearing capacity was mainly considered. The regularity of the buckling direction of the vertical pole, the stress at each typical position on the vertical pole and the axial force of the vertical pole was studied based on the experimental results. Based on the characteristics of semi-rigid connection joints, the correctness of the experimental results was verifi ed by fi nite element analysis, and the results show that reducing lift height and arranging diagonal bracing have remarkable infl uence on improving the structural stability bearing capacity. The usage of sleeves has little infl uence on the structural stability, and the corner pole was the worst position of the overall structural stability. The factors of working conditions and diagonal bracing have the remarkable infl uence on the buckling direction of the vertical pole. The factor of working condition has the most obvious infl uence on the stress uniformity of the vertical pole. The axial force of the vertical pole in the disc-buckle type formwork support structure presented a relatively uniform state from bottom to top in the loading process. The arrangement of diagonal bracing and the usage of sleeves have an infl uence on the uniformity of the axial force of the vertical pole. Compared with the fi nite element results, the error of the structural stability bearing capacity was within 6%, indicated that the fi nite element can accurately simulate the structural stability bearing capacity.

Effect of Gynosaponin on Rumen In vitro Methanogenesis under Different Forage-Concentrate Ratios

Manatbay, Bakhetgul,Cheng, Yanfen,Mao, Shengyong,Zhu, Weiyun Asian Australasian Association of Animal Productio 2014 Animal Bioscience Vol.27 No.8

The study aimed to investigate the effects of gynosaponin on in vitro methanogenesis under different forage-concentrate ratios (F:C ratios). Experiment was conducted with two kinds of F:C ratios (F:C = 7:3 and F:C = 3:7) and gynosaponin addition (0 mg and 16 mg) in a $2{\times}2$ double factorial design. In the presence of gynosaponin, methane production and acetate concentration were significantly decreased, whereas concentration of propionate tended to be increased resulting in a significant reduction (p<0.05) of acetate:propionate ratio (A:P ratio), in high-forage substrate. Gynosaponin treatment increased (p<0.05) the butyrate concentration in both F:C ratios. Denaturing gradient gel electrophoresis (DGGE) analysis showed there was no apparent shift in the composition of total bacteria, protozoa and methanogens after treated by gynosaponin under both F:C ratios. The real-time polymerase chain reaction (PCR) analysis indicated that variable F:C ratios significantly affected the abundances of Fibrobacter succinogenes, Rumninococcus flavefaciens, total fungi and counts of protozoa (p<0.05), but did not affect the mcrA gene copies of methanogens and abundance of total bacteria. Counts of protozoa and abundance of F.succinogenes were decreased significantly (p<0.05), whereas mcrA gene copies of methanogens were decreased slightly (p<0.10) in high-forage substrate after treated by gynosaponin. However, gynosaponin treatment under high-concentrate level did not affect the methanogenesis, fermentation characteristics and tested microbes. Accordingly, overall results suggested that gynosaponin supplementation reduced the in vitro methanogenesis and improved rumen fermentation under highforage condition by changing the abundances of related rumen microbes.

Diversity of Butyrivibrio Group Bacteria in the Rumen of Goats and Its Response to the Supplementation of Garlic Oil

Zhu, Zhi,Hang, Suqin,Mao, Shengyong,Zhu, Weiyun Asian Australasian Association of Animal Productio 2014 Animal Bioscience Vol.27 No.2

This study aimed to investigate the diversity of the Butyrivibrio group bacteria in goat rumen and its response to garlic oil (GO) supplementation as revealed by molecular analysis of cloned 16S rRNA genes. Six wethers fitted with ruminal fistulas were assigned to two groups for a cross-over design with 28-d experimental period and 14-d interval. Goats were fed a basal diet without (control) or with GO ruminal infusion (0.8 g/d). Ruminal contents were used for DNA extraction collected before morning feeding on d 28. A total bacterial clone library was firstly constructed by nearly full-length 16S rRNA gene cloned sequences using universal primers. The resulting plasmids selected by Butyrivibrio-specific primers were used to construct a Butyrivibrio group-specific bacterial clone library. Butyrivibrio group represented 12.98% and 10.95% of total bacteria in control and GO group, respectively. In libraries, clones were classified to the genus Pseudobutyrivibrio, Butyrivibrio and others within the family Lachnospiraceae. Additionally, some specific clones were observed in GO group, being classified to the genus Ruminococcus and others within the family Ruminococcaceae. Based on the criterion that the similarity was 97% or greater with database sequences, there were 29.73% and 18.42% of clones identified as known isolates (i.e. B. proteoclasticus and Ps. ruminis) in control and GO groups, respectively. Further clones identified as B. fibrisolvens (5.41%) and R. flavefaciens (7.89%) were specifically found in control and GO groups, respectively. The majority of clones resembled Ps. ruminis (98% to 99% similarity), except for Lachnospiraceae bacteria (87% to 92% similarity) in the two libraries. The two clone libraries also appeared different in Shannon diversity index (control 2.47 and GO group 2.91). Our results indicated that the Butyrivibrio group bacteria had a complex community with considerable unknown species in the goat rumen.