Fruit Nutrition Variation during the Harvest of Black Currant

Yadong Li,Yinghai Liang,Lin Wu,Zhidong Zhang 한국원예학회 2006 한국원예학회 기타간행물 Vol.- No.-

Studies on Shoot Regeneration from Leaf Pieces of Rubus in Vitro

Yadong Li,Wei An,Shuying Liu,Zhidong Zhang,Lin Wu 한국원예학회 2006 한국원예학회 기타간행물 Vol.- No.-

The dependence of luminescence on reduction of Sm2+ ions doped in lithium barium borate glasses

Li, Yadong,Huang, Yanlin,Jiang, Chuanfang,Jang, Kiwan Springer-Verlag 2009 APPLIED PHYSICS A MATERIALS SCIENCE AND PROCESSING Vol.97 No.3

Vibration-based delamination detection of composites using modal data and experience-based learning algorithm

Wei-Li Luo,Hui Wang,Yadong Li,Xing Liang,Tongyi Zheng 국제구조공학회 2022 Steel and Composite Structures, An International J Vol.42 No.5

In this paper, a vibration-based method using the change ratios of modal data and the experience-based learning algorithm is presented for quantifying the position, size, and interface layer of delamination in laminated composites. Three types of objective functions are examined and compared, including the ones using frequency changes only, mode shape changes only, and their combination. A fine three-dimensional FE model with constraint equations is utilized to extract modal data. A series of numerical experiments is carried out on an eight-layer quasi-isotropic symmetric (0/-45/45/90)s composited beam for investigating the influence of the objective function, the number of modal data, the noise level, and the optimization algorithms. Numerical results confirm that the frequency-and-mode-shape-changes-based technique yields excellent results in all the three delamination variables of the composites and the addition of mode shape information greatly improves the accuracy of interface layer prediction. Moreover, the EBL outperforms the other three state-of-the-art optimization algorithms for vibration-based delamination detection of composites. A laboratory test on six CFRP beams validates the frequency-and-mode-shape-changesbased technique and confirms again its superiority for delamination detection of composites.

Experimental Study and Analysis on Axial Compression Performance of High-Strength Recycled Concrete-Filled Steel Tube Column in Corrosive Environments

Cun Hui,Ke Li,Yonggang Li,Yadong Bian,Ran Hai,Chunqing Li 한국강구조학회 2022 International Journal of Steel Structures Vol.22 No.2

To explore the axial compression performance of high-strength recycled concrete-fi lled steel tube (RCFST) column in corrosive environments, ten high-strength RCFST columns with diff erent wall thicknesses of steel tube and corrosion degrees and two ordinary concrete-fi lled steel tube (CFST) columns were designed. Subsequently, an axial compression test was carried out on these specimens to obtain the load–displacement curve, skeleton curve, and rigidity degeneration curve. The stress process, failure morphology, characteristic load, and characteristic displacement were analyzed. According to the research fi ndings, the steel tube at the end of each specimen bulges. With increasing load, buckling occurs in the middle region, and the core concrete is crushed. The higher the corrosion degree of a specimen, the more obvious the buckling on its surface. The corrosion of a steel tube signifi cantly aff ects the initial stiff ness of high-strength RCFST column, which results in a signifi cant decline in its bearing capacity and stiff ness. An increase in the wall thickness of steel tubes can enhance the bearing capacity of a specimen. The ultimate balance theory was used to derive the calculation formula for the bearing capacity of each specimen, and the eff ects of diff erent lateral pressure coeffi cients on the results were compared and analyzed. Reasonable values were obtained by comparing with the experimental results. The software ABAQUS was used to establish a fi nite element numerical analysis model, and the damage deformation and load–displacement curves of each specimen were obtained. The analysis and comparison of the results obtained by the model and the obtained results verify the accuracy of the fi nite element analysis model.

Scalded Skin of Rat Treated by Using Fibrin Glue Combined with Allogeneic Bone Marrow Mesenchymal Stem Cells

( Yadong Yang ),( Wenyuan Zhang ),( Ying Li ),( Guojian Fang ),( Keji Zhang ) 대한피부과학회 2014 Annals of Dermatology Vol.26 No.3

Background: It is difficult to achieve satisfactory results with the traditional treatment of large-area skin defects and deep burns. Objective: To test the treatment effect of an active dressing film made of a mixture of fibrin glue and bone marrow mesenchymal stem cells (BMSCs) for repairing burn wounds on the skin of rats. Methods: Two scald wounds were made on the back of each rat. A total of 30 scald wounds were randomly divided into 3 groups, with 10 wounds in each group. In the experimental treatment group, the scald wounds were covered with the fibrin glue and BMSC mixture. The wounds of the experimental control group were covered with fibrin glue only. No intervention was administered to the blank control group. Thirty days after treatment, pathological sections were cut from the scalded local tissues of all rats from the 3 groups and observed with a microscope. Results: The speed of scald wound healing in the experimental treatment group was faster than the other 2 groups. In the experimental treatment group, histopathological analysis revealed that the sebaceous glands showed obviously proliferous at the edge of the new tissue and gradually extended to the deep dermal layer of the new tissue. Conclusion: BMSCs may have an active role in promoting skin tissue repair and generating skin appendages. Allogeneic BMSCs mixed with fibrin glue can contribute to the quick formation of a film-like gel over the scald wounds, which might be of significance for emergency treatment and skin-grafting operations. (Ann Dermatol 26(3) 289∼295, 2014)

Dissolution Kinetics of Thiourea in Triglycol Solution

Li, Hua,Guo, Feng,Hu, Guoqin,Zhao, Lei,Zhang, Yadong Korean Chemical Society 2010 대한화학회지 Vol.54 No.1

이소프로필 멀케푸탄은 중요한 약품 중간체이며 싸이오우레아와 트리글리콜은 이소프로필 멀케푸탄을 합성을 하는데 중요한 화합물이다. 그러므로 트리글리콜 용액에서의 싸이오우레아의 용해는 이소프로필 멀케푸탄의 생산에 중요하다. 트리글리콜용액에서 싸이오우레아의 용해 반응속도론을 조사하고 이소프로필 멀케푸탄을 생산하는 대체 공정을 제시하는것이 본 연구의 목적이다. 트리글리콜용액에서 싸이오우레아의 용해 반응속도론을 조사하기 위하여 용액 농도와 반응 온도를 중점적으로 관찰하였다. 싸이오우레아의 용해속도는 용액농도와 온도가 증가할수록 증가하였다. Isopropyl mercaptan is an important pharmaceutical intermediate and chemical material. And thiourea and triglycol are the main materials for the synthesis of isopropyl mercaptan. Therefore the dissolution of thiourea in triglycol solution is very important for the production of isopropyl mercaptan. The aims of this study are to examine the dissolution kinetics of thiourea in triglycol solution, and to present an alternative process for producing isopropyl mercaptan. In order to investigate the dissolution kinetics of thiourea in triglycol solution, the concentrations of solution and reaction temperature were selected as experimental parameters. It was determined that the dissolution rate of thiourea increased with the increase in solution concentration and temperature. An empirical equation was used in fitting the data. Statistical analysis indicated small errors and the results should be reliable.

Analysis of tool wear performance and surface quality in post milling of additive manufactured 316L stainless steel

Yadong Gong,Pengfei Li 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.5

Laser additive manufacturing (LAM) technology applied to the 316L stainless steel is attracting interest in the machining industry since it can shorten the production cycle and reduce numbers of machining steps. It still needs to be machined because of the poor surface quality, so the tool wear of post milling process after LAM needs to be studied. However, there are a few studies about the tool wear in milling of laser additive manufacturing stainless steel alloy. The aim of the paper is to evaluate the tool wear performance and surface quality when post milling the 316L stainless steel under different post milling (PM) time. The tool wear behavior was investigated using different analysis techniques. 3-D surface contour profilometer was used to measure the surface roughness and observe the morphology of small area; digital optical ultra-depth microscope analysis was carried out to evaluate tool wear and broken; the wear width of the blade was an indicator of the degree of the tool wear; different post milling methods were also compared. The obtained results demonstrate that the height of the LAM parts were connected with the heat dissipation effect; there are three stages of tool wear: initial wear stage, normal processing stage, and severe broken stage; usually the down-milling is better than up-milling at the bottom surface roughness, quality and edge morphology.

Effect of post-heat treatment on the microstructure and mechanical properties of laser metal deposition Inconel 718

Pengfei Li,Jianzhong Zhou,Yadong Gong,Xiankai Meng,Jinzhong Lu 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.7

The microstructure, hardness, and fracture strength of Inconel 718 fabricated with laser metal deposition are investigated. The solution treatment plus aging (STA) (including 980 °C, 720 °C, and 620 °C for 1, 8, and 8 h, respectively) and low-temperature stress-relief annealing (LTSLA) (including 650 °C for 1 h) are compared, which can respectively improve the hardness and tensile properties. Results show that the as-deposited sample mainly contained γ matrix, coarse Laves phase, granular carbides, and nitrides. STA and LTSLA post-heat treatments could respectively improve the hardness and tensile properties, while the elongation slightly decreased. The solution treatment promoted almost Laves phase to dissolve into γ matrix and homogenized the matrix, and the aging treatment promoted the precipitation of γ′ and γ′′ phases, which significantly improved the mechanical properties.

Luminescence characteristics and site-occupancy of Eu²⁺- and Eu³⁺-doped MgZn₂(PO₄)₂ phosphors

Xu, Chuanyan,Li, Yadong,Huang, Yanlin,Yu, Young Moon,Seo, Hyo Jin The Royal Society of Chemistry 2012 Journal of materials chemistry Vol.22 No.12

<P>Eu<SUP>2+</SUP>- and Eu<SUP>3+</SUP>-doped MgZn<SUB>2</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB> were prepared using the high temperature solid-state reaction method. The excitation spectra in the UV and VUV region, the emission spectra, and the luminescence decay curves of the Eu<SUP>2+</SUP> and Eu<SUP>3+</SUP> ions were investigated. The crystallographic distributions of the Eu<SUP>2+</SUP> and Eu<SUP>3+</SUP> sites in MgZn<SUB>2</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB> lattices are different. MgZn<SUB>2</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB>:Eu<SUP>2+</SUP> presents a bluish green luminescence with two distinct emission centers at 450 and 525 nm. MgZn<SUB>2</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB>:Eu<SUP>3+</SUP> presents an reddish orange color with luminescence transitions from the <SUP>5</SUP>D<SUB>0</SUB> level of the Eu<SUP>3+</SUP> ions. There exist two Eu<SUP>2+</SUP>-crystallographic sites in MgZn<SUB>2</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB>:Eu<SUP>2+</SUP>, which occupy both Mg<SUP>2+</SUP> and Zn<SUP>2+</SUP> sites. However, there is only one Eu<SUP>3+</SUP>-site in the MgZn<SUB>2</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB>:Eu<SUP>3+</SUP> lattices, which was confirmed by site-selective excitation and emission spectroscopy, and the luminescence decay in the <SUP>5</SUP>D<SUB>0</SUB>→<SUP>7</SUP>F<SUB>0</SUB> region of the Eu<SUP>3+</SUP> ions under a pulsed, tunable, narrowband dye laser. The Eu<SUP>3+</SUP> ion was suggested to occupy the octahedral Mg<SUP>2+</SUP>-site in the MgZn<SUB>2</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB> lattices. The spectral characteristics, the temperature-dependent luminescence intensity and activation energies of thermal stabilities and the microstructures were discussed on the basis of the crystal structure and the luminescence results.</P> <P>Graphic Abstract</P><P>Eu<SUP>2+</SUP> ions occupy both Mg<SUP>2+</SUP> and Zn<SUP>2+</SUP> sites in MgZn<SUB>2</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB>:Eu<SUP>2+</SUP>, and the occupancy on Zn<SUP>2+</SUP> sites is dominant. However, Eu<SUP>3+</SUP> ions are only distributed on the octahedral Mg<SUP>2+</SUP> sites in MgZn<SUB>2</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB>:Eu<SUP>3+</SUP>. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2jm16352g'> </P>