Wind characteristics of a strong typhoon in marine surface boundary layer

Song, Lili,Li, Q.S.,Chen, Wenchao,Qin, Peng,Huang, Haohui,He, Y.C. Techno-Press 2012 Wind and Structures, An International Journal (WAS Vol.15 No.1

High-resolution wind data were acquired from a 100-m high offshore tower during the passage of Typhoon Hagupit in September, 2008. The meteorological tower was equipped with an ultrasonic anemometer and a number of cup anemometers at heights between 10 and 100 m. Wind characteristics of the strong typhoon, such as mean wind speed and wind direction, turbulence intensity, turbulence integral length scale, gust factor and power spectra of wind velocity, vertical profiles of mean wind speed were investigated in detail based on the wind data recorded during the strong typhoon. The measured results revealed that the wind characteristics in different stages during the typhoon varied remarkably. Through comparison with non-typhoon wind measurements, the phenomena of enhanced levels of turbulence intensity, gust factors, turbulence integral length scale and spectral magnitudes in typhoon boundary layer were observed. The monitored data and analysis results are expected to be useful for the wind-resistant design of offshore structures and buildings on seashores in typhoon-prone regions.

Wind characteristics of a strong typhoon in marine surface boundary layer

Lili Song,Q. S. Li,Wenchao Chen,Peng Qin,Haohui Huang,Y.C. He 한국풍공학회 2012 Wind and Structures, An International Journal (WAS Vol.15 No.1

High-resolution wind data were acquired from a 100-m high offshore tower during the passage of Typhoon Hagupit in September, 2008. The meteorological tower was equipped with an ultrasonic anemometer and a number of cup anemometers at heights between 10 and 100 m. Wind characteristics of the strong typhoon, such as mean wind speed and wind direction, turbulence intensity, turbulence integral length scale, gust factor and power spectra of wind velocity, vertical profiles of mean wind speed were investigated in detail based on the wind data recorded during the strong typhoon. The measured results revealed that the wind characteristics in different stages during the typhoon varied remarkably. Through comparison with non-typhoon wind measurements, the phenomena of enhanced levels of turbulence intensity, gust factors, turbulence integral length scale and spectral magnitudes in typhoon boundary layer were observed. The monitored data and analysis results are expected to be useful for the wind-resistant design of offshore structures and buildings on seashores in typhoon-prone regions.

The Smart Technology Application Study of the Leisure Agriculture Parks

LifangQiao,Lili Song,Xinzheng Li 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.8

The leisure agriculture parks in China develop rapidly. The object in this paper is a leisure agriculture park in Qinyang City, Henan Province. The paper studied the framework and approach of integrating smart technology into the planning of leisure Agriculture Park. The application of smart technology centers on integrated platform, and is divided into smart breeding, smart planting, smart sunlight greenhouse, virtual park, visualization, smart logistics, smart sale modes and so on, and it forms a hierarchical structure consisting of perception layer, network layer, application layer, platform layer and service layer. Integrating smart technology into leisure Agriculture Park’s planning can improve product quality, increase production management efficiency in the park, and facilitate the sustainable development of the park.

Different distribution patterns of microorganisms between aquaculture pond sediment and water

Dai Lili,Liu Chengqing,Peng Liang,Song Chaofeng,Li Xiaoli,Tao Ling,Li Gu 한국미생물학회 2021 The journal of microbiology Vol.59 No.4

Aquatic microorganisms in the sediment and water column are closely related; however, their distribution patterns between these two habitats still remain largely unknown. In this study, we compared sediment and water microeukaryotic and bacterial microorganisms in aquaculture ponds from different areas in China, and analyzed the influencing environmental factors as well as the inter-taxa relationships. We found that bacteria were significantly more abundant than fungi in both sediment and water, and the bacterial richness and diversity in sediment were higher than in water in all the sampling areas, but no significant differences were found between the two habitats for microeukaryotes. Bacterial taxa could be clearly separated through cluster analysis between the sediment and water, while eukaryotic taxa at all classification levels could not. Spirochaetea, Deltaproteobacteria, Nitrospirae, Ignavibacteriae, Firmicutes, Chloroflexi, and Lentimicrobiaceae were more abundantly distributed in sediment, while Betaproteobacteria, Alphaproteobacter, Cyanobacteria, Roseiflexaceae, Dinghuibacter, Cryomorphaceae, and Actinobacteria were more abundant in water samples. For eukaryotes, only Cryptomonadales were found to be distributed differently between the two habitats. Microorganisms in sediment were mainly correlated with enzymes related to organic matter decomposition, while water temperature, pH, dissolved oxygen, and nutrient levels all showed significant correlation with the microbial communities in pond water. Intensive interspecific relationships were also found among eukaryotes and bacteria. Together, our results indicated that eukaryotic microorganisms are distributed less differently between sediment and water in aquaculture ponds compared to bacteria. This study provides valuable data for evaluating microbial distributions in aquatic environments, which may also be of practical use in aquaculture pond management.

Effect of GZO thickness and annealing temperature on the structural, electrical and optical properties of GZO/Ag/GZO sandwich films

Shumei Song,Tianlin Yang,Yanqing Xin,Lili Jiang,Yanhui Li,Zhiyong Pang,Maoshui Lv,Shenghao Han 한국물리학회 2010 Current Applied Physics Vol.10 No.2

The GZO/Ag/GZO sandwich films were deposited on glass substrates by RF magnetron sputtering of Gadoped ZnO (GZO) and ion-beam sputtering of Ag at room temperature. The effect of GZO thickness and annealing temperature on the structural, electrical and optical properties of these sandwich films was investigated. The microstructures of the films were studied by X-ray diffraction (XRD). X-ray diffraction measurements indicate that the GZO layers in the sandwich films are polycrystalline with the ZnO hexagonal structure and have a preferred orientation with the c-axis perpendicular to the substrates. For the sandwich film with upper and under GZO thickness of 40 and 30 nm, respectively, it owns the maximum figure of merit of 5.3 × 10-2 Ω-1 with a resistivity of 5.6 × 10-5 Ω cm and an average transmittance of 90.7%. The electrical property of the sandwich films is improved by post annealing in vacuum. Comparing with the as-deposited sandwich film, the film annealed in vacuum has a remarkable 42.8% decrease in resistivity. The sandwich film annealed at the temperature of 350 ℃ in vacuum shows a sheet resistance of 5 Ω/sq and a transmittance of 92.7%, and the figure of merit achieved is 9.3 × 10-2 Ω-1.

Repair of bone defects using dynamic fabricated tissue-engineered bone based on a bio-derived porous bone scaffold

Kedong Song,Liying Li,Lili Ji,Siyuan Li,Chunfeng Mu,Yiwei Wang,Tianqing Liu 한국통합생물학회 2016 Animal cells and systems Vol.20 No.5

Fabrication and transplantation of tissue-engineered bones in a rotating wall vessel bioreactor (RWVB) was studied in the present study aiming to repair segmental bone defects. Osteoblasts were transfected with green fluorescent protein prior to seeding on bio-derived porous bone scaffolds at a density of 1 × 106 cells/mL and cultured in an RWVB for one week. For comparison, constructs were also cultured in a static condition. Morphology and structure of fabricated bones were examined using an inverted microscope, scanning electron microscope and histology analysis via hematoxylin–eosin and toluidine blue staining. Moreover, an animal model for repairing segmental bone defects of a Zelanian rabbit was used to assess the efficacy and biosafety of fabricated bones. In conclusion, tissue-engineered bones grew favorably in RWVB. In animal study, a preliminary repair of bone defects was noticed only in the experimental group after 4 weeks of implantation. Using RWVB, the fabricated tissue-engineered bone constructs were approved with better bio-capability in repairing the segmental bone defect.

Antioxidant Activity of Silk Peptide and Co-initiation Behavior in Free Radical Photopolymerization of Acrylamide

Xuying Nan,Lili Sun,Xinming Song,Mingshu Wu,Guangying Chen,Yuhua Yao 한국섬유공학회 2019 Fibers and polymers Vol.20 No.8

A water-soluble silk peptide (SP) was fractioned to a series of SP fractions with different molecular weight. Theantioxidant activity of these fractions was investigated by the ABTS and DPPH assays, and the co-initiating ability of eachfraction in type II photoinitiator was evaluated in photopolymerization of acrylamide, using camphorquinone as thesensitizer. Gel permeation chromatograph was used to investigate molecular weight distributions of SP fractions. The resultsshowed that with the increase of the proportion of the component with molecular weight of about 200 in SP fractions,antioxidant activity and co-initiation ability became poor. Four essential amino acids, Ala, Gly, Ser and Tyr of SP and theirrespective pentapeptides were also assessed for these two functions. Among them, pentatyrosine exhibited the most excellentperformance in two functions, which might be ascribed to its excellent electron/hydrogen donation capability. Andpentaglycine had good behavior in these two functions, suggesting that the polypeptide chain was responsible for electron/hydrogen donation. By 1H NMR analysis, it was speculated that the photoinitiation active center was located on themethylene group of pentaglycine. The electron/hydrogen donor of SP is the inherent reason for antioxidant function andphotoinitiation performance of SP.

The Role of Intestinal Fungi and Its Metabolites in Chronic Liver Diseases

Ningning You,Lili Zhuo,Jingxin Zhou,Yu Song,Junping Shi 거트앤리버 소화기연관학회협의회 2020 Gut and Liver Vol.14 No.3

Current studies have confirmed that liver diseases are closely related to intestinal microorganisms; however, those studies have mainly concentrated on bacteria. Although the proportion of intestinal microorganisms accounted for by colonizing fungi is very small, these fungi do have a significant effect on the homeostasis of the intestinal microecosystem. In this paper, the characteristics of intestinal fungi in patients with chronic liver diseases such as alcoholic liver disease, nonalcoholic fatty liver disease and cirrhosis are summarized, and the effects of intestinal fungi and their metabolites are analyzed and discussed. It is important to realize that not only bacteria but also intestinal fungi play important roles in liver diseases.

Electric Control of Friction on Silicon Studied by Atomic Force Microscope

Yan Jiang,Lili Yue,Boshen Yan,Xi Liu,Xiaofei Yang,Guoan Tai,Juan Song 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.3

We investigated friction on an n-type silicon surface using an atomic force microscope when a bias voltage was applied to the sample. Friction forces on the same track line were measured before and after the bias voltages were applied and it was found that the friction forces in n-type silicon can be tuned reversibly with the bias voltage. The dependence of adhesion forces between the silicon nitride tip and Si sample on the bias voltages approximately follows a parabolic law due to electrostatic force, which results in a significant increase in the friction force at an applied electric field.

Comparative proteomic analysis of parasitic loranthus seeds exposed to dehydration stress

Limei Pan,Lingyun Wan,Lili He,Lisha Song,Hairong Long,Xiaowen Ji,Ni Jiang,Juan Huo,Shugen Wei,Jine Fu 한국식물생명공학회 2021 Plant biotechnology reports Vol.15 No.1

Parasitic loranthus [Taxillus chinensis (DC.) Danser] is an important medicinal plant that produces recalcitrant seeds that are sensitive to dehydration. Desiccation tolerance is critical for the survival of recalcitrant seeds in low-moisture environments. Clarifying how these seeds respond to desiccation is important for long-term conservation. Thus, the viability, germination, microstructure, and antioxidant enzyme activities of dehydrated parasitic loranthus seeds were investigated. Diverse organelles were degraded or deformed during dehydration treatments. Additionally, superoxide dismutase and catalase activities gradually decreased in response to desiccation stress. A proteomic analysis involving TMT-labeling and LC–MS/ MS were performed. A total of 1479 proteins were identifed, of which 141 were diferentially expressed proteins (DEPs) at 16 and 36 h after initiating the dehydration treatments. A functional annotation based on gene ontology revealed that the DEPs were mainly localized in chloroplasts and were related to energy metabolism, responses to stimuli, and the regulation of biological processes. A KEGG pathway enrichment analysis determined that several of the identifed proteins were associated with signal transductions, photosynthesis, and glycolysis/gluconeogenesis. The results suggest that the efcient removal of excessive ROS amounts may be crucial for promoting parasitic loranthus seed germination under dehydration stress conditions. A series of candidate dehydration stress-related proteins were identifed and may be relevant for enhancing the dehydration tolerance of the recalcitrant seeds. To the best of our knowledge, this is the frst study to elucidate the possible molecular mechanisms underlying the sensitivity of recalcitrant parasitic loranthus seeds to dehydration via a proteomic analysis involving TMT-labeling.