Boron and Phosphorus Removal During High Purity Hypereutectic Al–Si Solidification

Yanlei Li,Jian Chen 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.4

Al–Si solvent refining is a promising process for silicon purification, and the key impurity elements are boron and phosphorus. Thermodynamic calculation and experiments in particular temperatures show that boron and phosphorus segregationcoefficients in Al–Si melt decrease with decreasing temperature, and it is not verified in traditional solidification. In orderto character boron and phosphorus removal in Al–Si solidification over a temperature range, high purity hypereutecticAl–Si melts were solidified at relatively low cooling rate. It is found that boron and phosphorus removal rates increase withdecreasing temperature. The tread that the boron and phosphorus segregation coefficients in the Al–Si melt decease withdecreasing temperature is confirmed in solidification over a temperature range. In addition, aluminum content in purifiedsilicon is close to the maximum solid solubility of aluminum in silicon.

Identification of failure mechanisms for CFRP-confined circular concrete-filled steel tubular columns through acoustic emission signals

Yanlei Wang,Dong-Sheng Li,Fangzhu Du,Zhi Chen 국제구조공학회 2016 Smart Structures and Systems, An International Jou Vol.18 No.3

The CFRP-confined circular concrete-filled steel tubular column is composed of concrete, steel, and CFRP. Its failure mechanics are complex. The most important difficulties are lack of an available method to establish a relationship between a specific damage mechanism and its acoustic emission (AE) characteristic parameter. In this study, AE technique was used to monitor the evolution of damage in CFRP-confined circular concrete-filled steel tubular columns. A fuzzy c-means method was developed to determine the relationship between the AE signal and failure mechanisms. Cluster analysis results indicate that the main AE sources include five types: matrix cracking, debonding, fiber fracture, steel buckling, and concrete crushing. This technology can not only totally separate five types of damage sources, but also make it easier to judge the damage evolution process. Furthermore, typical damage waveforms were analyzed through wavelet analysis based on the cluster results, and the damage modes were determined according to the frequency distribution of AE signals.

Damage analysis of carbon nanofiber modified flax fiber composite by acoustic emission

Dongsheng Li,Junbo Shao,Jinping Ou,Yanlei Wang 국제구조공학회 2017 Smart Structures and Systems, An International Jou Vol.19 No.2

Fiber reinforced polymer (FRP) has received widespread attention in the field of civil engineering because of its superior durability and corrosion resistance. This article presents the damage mechanisms of a novelty composite called carbon nanofiber modified flax fiber polymer (CNF-modified FFRP). The ability of acoustic emission (AE) to detect damage evolution for different configurations of specimens under uniaxial tension was examined, and some useful AE characteristic parameters were obtained. Test results shows that the mechanical properties of modified composites are associated with the CNF content and the evenness of CNF dispersed in the epoxy matrix. Various damage mechanisms was established by means of scanning electron microscope images. The fuzzy c-means clustering were proposed to classify AE events into groups representing different generation mechanisms. The classifiers are constructed using the traditional AE features - six parameters from each burst. Amplitude and peak-frequency were selected as the best cluster-definition features from these AE parameters. After comprehensive comparison, a correlation between these AE events classes and the damage mechanisms observed was proposed.

Molecular Cloning and Functional Characterization of FOUR LIPS in Pomegranate, a Protein Involved in Regulating the Gravitropic Set-Point Angle of Adventitious Roots

Wang Zenghui,Li Jialin,Wang Chuanzeng,Feng Lijuan,Yin Yanlei 한국식물학회 2022 Journal of Plant Biology Vol.65 No.5

Self-rooted pomegranate seedlings are widely used in the horticultural industry to cut costs and time. However, these seedlings produce shallow roots that exhibit poor cold resistance. Thus, deeper adventitious roots generated through gravitropism are imperative for seedling survival, and understanding the molecular mechanisms of gravitropism can facilitate improved breeding techniques. We hypothesized that gravitropism in pomegranate is partially controlled by pomegranate FOUR LIPS (PgFLP), an R2R3-MYB protein that interacts with and controls the transcriptional expression of PgPIN10, which facilitates transmembrane auxin signaling. We studied subcellular localization of PgFLP, quantified auxin levels, and measured gravitropic set-point angle (GSA) to investigate the underlying mechanisms regulating PgPIN10 expression during the formation of GSA in pomegranate adventitious roots. We found that PgFLP was localized to the nucleus based on use of green florescent proteins, suggesting that this protein is a transcription factor. When using the tractable 35S::PgFLP, we observed stronger gravitational response in overexpression lines leading to a narrower GSA than in the wild-type Arabidopsis, and the expression of PgFLP and PgPIN10 in ‘Lanbaoshi’ (LBS; a deep-rooted cultivar) was higher than that in ‘Taishanhong’ (TSH; a shallow-rooted cultivar), which indicates that PgFLP may participate in regulating the GSA of adventitious roots via PgPIN10 in pomegranate. Taken together, our results indicate that the pomegranate R2R3-MYB transcription factor, PgFLP, plays a vital role in setting the GSA of adventitious roots in this crop species.

Research on Operating Performance and E-business Marketing Strategy in Retail Enterprises based on Online Shopping

Yongqiang Zhang,Yanlei Gao,Xiang Li,Duchun Wang 보안공학연구지원센터 2015 International Journal of Security and Its Applicat Vol.9 No.11

In recent years, with the rapid development of internet technology, enterprise business model has entered a new century. The emergence of network economy has forced retail enterprises to change the original marketing mode, global information resources can be shared instantly, which greatly improve the operational efficiency and reduce the cost. In this paper, we analyze the influence factors that impact on retail enterprises based on consumers online shopping behavior, survey data from small and medium enterprises. The result shows that macro environment factors, market competition, enterprise self factors will affect the enterprise's e-commerce performance, and significantly promote the enterprise's market strategy innovation. Therefore, it is an important way to improve the competitiveness of enterprises by carrying out the E-business market strategy.

Fabrication of composite nanofiltration membranes with enhanced structural stability for concentrating oligomeric proanthocyanidins in ethanol aqueous solution

Yanyan Ma,Yanlei Su,Yafei Li,Zhongyi Jiang 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.9

Composite nanofiltration (NF) membranes with enhanced structural stability were fabricated and used to concentrate oligomeric proanthocyanidins (OPC) in ethanol solution. The composite NF membranes were prepared by interfacial polymerization of piperazine (PIP) with trimesoyl chloride (TMC), upon the porous supports of polyethersulfone (PES) and polyvinyl formal (PVF) blend membranes. The active layers of composite NF membranes were covalently linked to porous supports owing to hydroxyl groups of PVF upon support surface, which could participate in the interfacial polymerization reaction. The pure water fluxes of the composite NF membranes reached 34.9 L/m2h, while the rejections of Na2SO4 and orange GII were 92.7% and 98.4%, respectively. The enhanced structural stability of the composite NF membranes were confirmed by long-term immersion experiment in ethanol. NF concentration process was considered as a potential alternative to conventional evaporation concentration process for OPC concentration in ethanol solution.

Rapid Nondestructive Prediction of Multiple Quality Attributes for Different Commercial Meat Cut Types Using Optical System

Jiangying An,Yanlei Li,Chunzhi Zhang,Dequan Zhang 한국축산식품학회 2022 한국축산식품학회지 Vol.42 No.4

There are differences of spectral characteristics between different types of meat cut, which means the model established using only one type of meat cut for meat quality prediction is not suitable for other meat cut types. A novel portable visible and near-infrared (Vis/NIR) optical system was used to simultaneously predict multiple quality indicators for different commercial meat cut types (silverside, back strap, oyster, fillet, thick flank, and tenderloin) from Small-tailed Han sheep. The correlation coefficients of the calibration set (Rc) and prediction set (Rp) of the optimal prediction models were 0.82 and 0.81 for pH, 0.88 and 0.84 for L*, 0.83 and 0.78 for a*, 0.83 and 0.82 for b*, 0.94 and 0.86 for cooking loss, 0.90 and 0.88 for shear force, 0.84 and 0.83 for protein, 0.93 and 0.83 for fat, 0.92 and 0.87 for moisture contents, respectively. This study demonstrates that Vis/NIR spectroscopy is a promising tool to achieve the predictions of multiple quality parameters for different commercial meat cut types.

Experimental Study on Y-shaped Bridge Under 3-dimentional Earthquake Ground Motions

Yan Lei,Li Qingning 대한토목학회 2017 KSCE JOURNAL OF CIVIL ENGINEERING Vol.21 No.6

Based on similar theory and multi-dimensional seismic design theory, a Y-shaped bridge model with the scale ratio of 1:20 was made to conduct the seismic simulation shaking table test in this paper. Failure mode and dynamic responses of Y-shaped bridge under different seismic wave spectrum, different peak accelerations and different seismic excitation directions were studied. The experimental results show that, the piers mostly exhibit bending failure mode and the vertical ground motion has a great influence on the development of cracks in girders. Dynamic responses of the Y-shaped bridge are different and presented different laws when three different seismic waves were applied. Seismic wave is input along the direction of the branch straight girder, which is the most unfavorable earthquake input direction when calculating the peak acceleration at the top of piers. Multi-dimension seismic excitation should be considered when calculating the width of the expansion joint between adjacent girders. The horizontal bidirectional seismic excitation can satisfy the design requirements of strain response at the bottom of pier. The model structure would cause vertical vibration during its horizontal seismic excitation, and vertical seismic excitation exerts more significant influence on the vertical vibration of branch straight girder.