Improved AQPSO Algorithm for Solving the Model of the Skin Effect Electric Heating System

Ding Li,Ding Xinghua,Ren Weina,Lin Aiguo 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.5

In view of the importance of the skin-eff ect electric heat tracing system of the submarine oil pipeline in heating and condensation reduction, it is necessary to start from the skin electric heating mechanism and construct its complete mathematical model to realize the effi cient operation of the system. Aiming at the problem of unknown parameters in the model of the skin-eff ect electric heat tracing system, an improved adaptive quantum behaviour particle swarm optimization algorithm (AQPSO) based on the quantum behaviour particle swarm optimization algorithm is proposed, in order to eff ectively identify the model parameters. In the algorithm design, in view of the high dependence of the basic QPSO algorithm on the shrinkage and expansion coeffi cients, the particle aggregation factor is introduced, and the shrinkage and expansion coeffi cients are redesigned. In view of the diff erent proportions of the fi tness value of the individual optimal position, the weight coeffi cient is introduced to construct the best position of the average weight to realize the improvement of the basic QPSO algorithm. The simulation results show that the AQPSO algorithm has better performance than QPSO in terms of convergence accuracy and robustness. This algorithm not only overcomes the inherent premature defects of particle swarms, but also improves the accuracy of the algorithm and obtains accurate model parameters. It can be seen that the improved adaptive quantum behaviour particle swarm algorithm has certain feasibility and eff ectiveness in the parameter identifi cation of Hammerstein model.

Excessive mechanical strain accelerates intervertebral disc degeneration by disrupting intrinsic circadian rhythm

Ding Sheng-Long,Zhang Tai-Wei,Zhang Qi-Chen,Ding Wang,Li Ze-Fang,Han Guan-Jie,Bai Jin-Song,Li Xi-Lei,Dong Jian,Wang Hui-Ren,Jiang Li-Bo 생화학분자생물학회 2021 Experimental and molecular medicine Vol.53 No.-

Night shift workers with disordered rhythmic mechanical loading are more prone to intervertebral disc degeneration (IDD). Our results showed that circadian rhythm (CR) was dampened in degenerated and aged NP cells. Long-term environmental CR disruption promoted IDD in rats. Excessive mechanical strain disrupted the CR and inhibited the expression of core clock proteins. The inhibitory effect of mechanical loading on the expression of extracellular matrix genes could be reversed by BMAL1 overexpression in NP cells. The Rho/ROCK pathway was demonstrated to mediate the effect of mechanical stimulation on CR. Prolonged mechanical loading for 12 months affected intrinsic CR genes and induced IDD in a model of upright posture in a normal environment. Unexpectedly, mechanical loading further accelerated the IDD in an Light-Dark (LD) cycle-disrupted environment. These results indicated that intrinsic CR disruption might be a mechanism involved in overloading-induced IDD and a potential drug target for night shift workers.

Study on the Porosity of TiO_2 Films Prepared by Using Magnetron Sputtering Deposition

Ding Ren,Yu Zou,ChangYong Zhan,NingKang Huang 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.58 No.41

TiO_2 films with potential for dye-sensitized solar cells were deposited by using reactive medium frequency magnetron sputtering deposition. Two groups of films were prepared respectively by changing the oblique angle of the substrate and the total pressure. Scanning electron microscopy and spectroscopic ellipsometry measurements were used to characterize the deposited TiO<SUB>2</SUB> films. The result showed that increasing the oblique angle and increasing the total pressure were both effective in increasing the porosity of the TiO_2 films.

Research on Deep-Sea Pipeline Tube Bundle Heating System

Li Ding,Xinghua Ding,Weina Ren,Yingying Mu,Aiguo Lin 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.6

In order to ensure the safety of deep-sea submarine pipelines, this paper focuses on the analysis of the axial temperature distribution model of the submarine pipeline and the distribution parameter circuit model of the tube bundle heating system. Combined with these two models, theoretical analysis shows that the heating eff ect of the tube bundle heating system depends on the distributed circuit parameters and power frequency of the system. In order to improve the heat tracing effi ciency, the power frequency needs to be adjusted according to the change of the load temperature, so the power supply frequency of the tube bundle heating system based on the Hammerstein model is optimized. Using a neuro-fuzzy algorithm, not only the theoretical values of heating power and power frequency are obtained, but also the drawbacks of determining the above parameters based on engineering experiments are avoided. Moreover, the pipeline heating is effi cient and stable, the dynamic response is fast, and the working condition is also well adapted.

Effect of Monensin and Live Yeast Supplementation on Growth Performance, Nutrient Digestibility, Carcass Characteristics and Ruminal Fermentation Parameters in Lambs Fed Steam-flaked Corn-based Diets

Ding, J.,Zhou, Z.M.,Ren, L.P.,Meng, Q.X. Asian Australasian Association of Animal Productio 2008 Animal Bioscience Vol.21 No.4

In performance, digestibility and slaughter trials, a total of forty five male weaned lambs were used to examine the effects of monensin and live yeast supplementations on growth performance, nutrient digestibility, carcass characteristics and ruminal fermentation parameters when the lambs were fed steam-flaked corn-based diets. Animals were allotted to one of three treatment diets in a completely randomized design. The three treatment diets were: (1) basal diet (CON) with steam-flaked corn as a sole grain source, (2) basal diet supplemented with monensin (MO), and (3) basal diet supplemented with live yeast (LY). Total average daily intake (ADI) was unaffected by MO and LY supplementations. LY supplementation increased (p<0.05) average daily gain (ADG) by 13.1% compared with the CON diet. Both MO and LY supplementations resulted in a significant improvement (p<0.05) of feed efficiency over the CON diet (4.47, 4.68 vs. 5.05). Hemicellulose digestibility was higher (p<0.05) for lambs in the LY supplementation group (62.4%) as compared with the CON group (55.7%), but no differences were observed in digestibilities of dry matter (DM), organic matter (OM), crude protein (CP), neutral detergent fiber (NDF) and acid detergent fiber (ADF). All carcass traits were not influenced by dietary supplementations. Ruminal pH in lambs fed the LY supplemental diet was more stable than that with the CON diet (6.57 vs. 6.17). Neither MO nor LY supplementation influenced the concentration of ruminal ammonia-N and total volatile fatty acid (VFA), and molar percentages of individual VFA. Plasma urea-N concentration was decreased (p<0.05) by MO and LY supplementations, while plasma ${\beta}$-hydroxybutyrate (BHBA), glucose and other blood parameters were unaffected. In conclusion, while both MO and LY supplementations had a positive impact on feed efficiency and LY supplementation stabilized ruminal pH and improved fiber utilization, none of the supplements had the capacity to significantly enhance the carcass characteristics.

Regulation of OsLPR1 gene on the formation of rice root iron plaque under low phosphorus

Ding Yan,Ren Menglian,Mo Shuangrong,Liu Jing,Wang Zegang,Ge Cailin,Wang Yulong 한국식물생명공학회 2022 Plant biotechnology reports Vol.16 No.3

In rice, low phosphorus results in the formation of reddish-brown iron plaque on the root surface, affecting the absorption of different elements by roots. In this paper, three different types of rice varieties were used as materials, and the transcriptomic and proteomic analysis, real-time fluorescence quantitative PCR (qRT-PCR), and OsLPR1 gene knockout techniques were employed to study the regulation of the OsLPR1 gene on the formation of iron plaque on root under low phosphorus. The transcriptomics and qRT-PCR analysis results showed that the transcription of five OsLPR1 homologous genes in roots of the three tested rice varieties was significantly induced by low-phosphorus treatment. Proteomic analysis results demonstrated that low-phosphorus treatment increased LPR1 protein content in rice roots compared with the control. Furthermore, the formation of iron plaque on rice root surface under low-phosphorus treatment was significantly inhibited by OsLPR1 gene knockout. These results further evidence that low phosphorus-induced OsLPR1 gene expression promotes the formation of iron plaque on rice root surface.

3D Architectures of LaVO₄:Eu³⁺ Microcrystals via an EG-assisted Hydrothermal Method: Phase Selective Synthesis, Growth Mechanism and Luminescent Properties

Ding, Yi,Zhang, Bo,Ren, Qifang,Zhang, Qicai,Zha, Weiwei,Li, Xin,Chen, Shaohua,Oh, Won-Chun The Korean Ceramic Society 2017 한국세라믹학회지 Vol.54 No.2

In this article, pure $m-LaVO_4:Eu^{3+}$ and $t-LaVO_4:Eu^{3+}$ nanocrystals were prepared by an EG-assisted hydrothermal method with regular shapes. A series of controlled experiments showed that the pH value of a mixed solution, the volume ratio of $EG/H_2O$ and the dosage of the doped $Eu^{3+}$ all had an important effect on the sizes and shapes of the final products. Furthermore, the constitutional unit of the products changed from 0D to 2D with an increase in the EG dosage. The PL results showed that $t-LaVO_4$ doped with $Eu^{3+}$ ions had better luminescence properties than $m-LaVO_4$ due to its special structure. All of these results not only expand our understanding of the luminescence properties of lanthanide orthovanadates, but they also elucidate the principles of the crystal growth.

Structural health monitoring of a high-speed railway bridge: five years review and lessons learned

Ding, Youliang,Ren, Pu,Zhao, Hanwei,Miao, Changqing Techno-Press 2018 Smart Structures and Systems, An International Jou Vol.21 No.5

Based on monitoring data collected from the Nanjing Dashengguan Bridge over the last five years, this paper systematically investigates the effects of temperature field and train loadings on the structural responses of this long-span high-speed railway bridge, and establishes the early warning thresholds for various structural responses. Then, some lessons drawn from the structural health monitoring system of this bridge are summarized. The main context includes: (1) Polynomial regression models are established for monitoring temperature effects on modal frequencies of the main girder and hangers, longitudinal displacements of the bearings, and static strains of the truss members; (2) The correlation between structural vibration accelerations and train speeds is investigated, focusing on the resonance characteristics of the bridge at the specific train speeds; (3) With regard to various static and dynamic responses of the bridge, early warning thresholds are established by using mean control chart analysis and probabilistic analysis; (4) Two lessons are drawn from the experiences in the bridge operation, which involves the lacks of the health monitoring for telescopic devices on the beam-end and bolt fractures in key members of the main truss.

Modal Analysis of a Single-Aperture Monopulse Feed Horn

Ren Chun,Ding Zhiyoung,Ki-Rock Kim,Ononchimeg Sodnomtseren,Bierng-Chearl Ahn 한국정보기술학회 2008 한국정보기술학회논문지 Vol.6 No.6

In this paper, we present a modal analysis of a single-aperture monopulse feed horn. The horn aperture is of square type and it is assumed that necessary higher-order modes can be generated by suitable means. First we consider the type of higher-order modes that can be employed in the realization of the sum and difference patterns for the monopulse feed. The principle of choosing mode ratios for the sum and difference channels is presented and an optimum set of mode ratios are derived. With the derived mode ratios, we compute and plot the aperture electric field distribution and the resultant radiation patterns.

Study on the Waterproofing Performance of FGD Gypsum Building Products from Inorganic-Organic Composite Additives

Ding, Yi,Fang, Youchun,Ren, Qifang,Fang, Hui,Zhang, Qicai,Oh, Won-Chun Materials Research Society of Korea 2015 한국재료학회지 Vol.25 No.11

In this article, poly methyl triethoxy silane was compounded with an inorganic waterproof admixture at a certain ratio to improve the performance of gypsum products; a new type of high-efficiency compound water-proofing additive was also investigated. Furthermore, the waterproof mechanism and the various properties on the hardened gypsum plaster were investigated in detail by XRD and SEM. The results show that the intenerate coefficient of gypsum plaster increased to more than 0.9; the water absorbing rate decreased to less than 10 %. Both the bending strength and the compressive strength of gypsum plaster increased by various degrees. The intenerate coefficient reached a maximum value of 0.73 and the strength of the samples showed almost no change when 5% cement alone was added. In this new type of the high-efficiency compound with waterproof additive, the optimal technological parameters for formulas were obtained to be: 5% cement, 18 % mineral powder, and 0.8% poly methyl triethoxy silane, to compound gypsum plaster. Meanwhile, the production of high performance gypsum as a building material has become possible.