Wyniki wyszukiwania - Biblioteka Nauki

1

Generation of Electronic Nautical Chart Data for Assessment of Navigational Safety in Harbour and Waterway Design

100%

Guan K. , Shi C. , Wu S. , Xu T.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

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2010

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tom Vol. 4, no. 1

17--22

EN

Navigational simulator is widely applied in the assessment of Navigational Safety in the harbour and waterway design. According to the needs of ENC(Electronic Nautical Chart) data in the navigational assessment, this paper analyzes the source of ENC data, such as S-57 data, MVCF(Military Vector Chart Format) data and CAD(Computer Aided Design) data. An effective method of ENC data generation has been developed. Special techniques are investigated for generating ENC data, such as ENC data structure design-ing, chart data conversion, digitization method of raster images of CAD design drawing, optimization ap-proaches and data integration methods. Software has been developed to edit the chart data with good perfor-mance. The technologies developed in this paper have been applied to more than 100 practical projects and successful results have been obtained.

2

An investigation of mechanical properties of recycled coarse aggregate concrete

100%

Deng X. H. , Lu Z. L. , Li P. , Xu T.

Archives of Civil Engineering

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2016

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tom Vol. 62, nr 4/II

19--34

EN

Recycling construction and demolition waste not only reduces project costs; and saves natural resources, but also solves the environmental threat caused by construction waste disposal. In this paper, C25 waste road concrete is used as an experimental material, the uniaxial compression strength and tensile splitting strength of C25 RAC whose coarse aggregate replacement rate is 0%, 25%, 50%, 75%, and 100% are tested under the condition that the water-to-cement ratio is 0.47, 0.55 and 0.61. The results show: (1) the uniaxial compression strength and tensile splitting strength decrease with the increase of RAC; (2) for concrete with the same water-to-cement ratio, when the coarse aggregate replacement rate changes from 0% to 50%, the uniaxial compression strength and tensile splitting strength of RAC changes slightly. When the coarse aggregate replacement rate changes from 50% to 100%, the uniaxial compression strength and tensile splitting strength of RAC decreases rapidly.

PL

Recykling odpadów budowlanych oraz materiałów pochodzących z rozbiórek nie tylko zmniejsza koszty projektu i oszczędza zasoby naturalne, ale również zażegnuje zagrożenie dla środowiska spowodowane przez składowanie odpadów budowlanych. Szczególnie w odniesieniu do właściwości mechanicznych betonu z kruszywa gruboziarnistego poddanego recyklingowi, odpady betonu drogowego C25 są używane jako materiał eksperymentalny, pod warunkiem że stosunek wody do cementu wynosi 0,47, 0,55 i 0,61 oraz są przygotowane próbki betonu o wskaźniku zamiany betonu z kruszywa gruboziarnistego poddawanego recyklingowi wynoszącym 25%, 50%, 75% i 100% betonu z naturalnego kruszywa gruboziarnistego. Próbka to sześcian o wymiarach 150 × 150 × 150 mm. Przygotowaliśmy 6 próbek dla każdego wskaźnika zamiany betonu z kruszywa gruboziarnistego poddawanego recyklingowi. Przygotowano łącznie 90 próbek betonu. Próbki zostały usunięte 24 godziny po ustawieniu oraz były utwardzane w temperaturze 20°C i wilgotności 90% przez 28 dni. Następnie przeprowadzono próby ściskania jednoosiowego oraz wytrzymałości na rozciąganie przez rozłupywanie betonu z kruszywa poddawanego recyklingowi C25.

3

Progressive collapse test of ship structures in waves

100%

Pei Z. , Xu T. , Wu W.

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nr Special Issue S3

EN

The external loads and structural ultimate strength are two important aspects for the safety of ship hull girder. It may collapse in case the structural capacity is less than the external forces in extreme seas. In the present research, progressive collapse test is performed to investigate the collapse mechanism of ship structure in waves. External load with time history and corresponding structural collapse behavior are measured and discussed to demonstrate the interaction of fluid and structures

4

UV-induced photodecomposition of 2, 2′, 4, 4′, 6, 6′-hexanitrostillbene (HNS)

100%

Sun Y. , Xu T. , Shu Y. , Zhong F.

Materials Science Poland

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2013

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tom Vol. 31, No. 3

306--311

EN

HNS (2, 2’, 4, 4’, 6, 6’-hexanitrostillbene) is a heat-resistant photosensitive explosive widely used in the booster charge. Investigation of the photodecomposition mechanism may provide important information for controlling and enhancing the detonation performance, also for the lifetime prediction. The UV-induced photodecomposition of HNS has been subjected to experimental studies. The UV-Vis spectra, X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance spectra (EPR) demonstrate the formation of NO2 free radicals and nitroso derivatives of HNS upon UV irradiation, which proves well known facts that C–NO2 breaking and removal of oxygen from the nitro group take part in the photodecomposition of HNS.

5

Marine Traffic Real-Time Safety Index

100%

Xu T. , Hu Q. Y. , Xiang Z. , Wang D. L.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

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2014

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tom Vol. 8 no. 4

599--603

EN

To reflect the safety degree of marine traffic in real-time and intuitively, this paper put forward a concept of real-time safety index of marine traffic, established marine traffic real-time safety index system, and constructed a real-time safety index evaluation model by using vessel traffic and navigation environmental data provided by shore-based AIS base station network, and quantifying a variety of data which impacts the safety of marine traffic such as ships’ real-time dynamic data, weather changes and so on. A continuous real-time evaluation to a specific area was carried out in the form of real-time index curve, taking the Waigaoqiao Channel of Port Shanghai as an example, to verify the feasibility and effectiveness of marine traffic real-time safety index.

6

Future directions in Multiple Instance Learning

100%

Chiu D. , Gondra I. , Xu T.

Journal of Theoretical and Applied Computer Science

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2013

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tom Vol. 7, nr 3

29--39

EN

In Multiple Instance Learning, each training sample consists of a set of unlabelled instances. The set as a whole is labeled positive if at least one instance in the set is positive, or negative otherwise. Given such training samples, the goal is to learn either an explicit description of the common positive instance(s) or a bag classifier that can assign labels to bags. Previous research has focused on this standard definition of the problem where instances in a set are independent. This raises a question: if we remove the independence assumption, can we generalize the goal of finding a description of the common instance(s) to that of finding a description of the common pattern(s) among instances? Similarly, can we generate bag classifiers that discriminate based on common pattern(s) among instances instead of just common instance(s)? This question raises many other related questions that have not been yet fully explored in the context of this problem. In this paper we first present a survey of existing methods that work with the standard definition of the problem and then elaborate on the previous question in the hope that researchers will investigate this exciting research direction.

7

Reef Reservoir Identification by Wavelet Decomposition and Reconstruction : A Case Study from Yuanba Gas Field in China

100%

Cheng B. , Xu T. , Robbins B. , Shen Z. M.

Acta Geophysica

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2015

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tom Vol. 63, no. 4

1025--1043

EN

The organic reef is a special type of carbonate reservoir which always dominates the spatial distribution, reserves and accumulations of natural gas. However, it is difficult to determine the organic reef’s internal structure and gas reservoirs due to numerous adverse factors such as the low resolution of seismic data, depth of burial, strong anisotropy, irregular spatial distribution and complex internal structure. A case study of wavelet decomposition and reconstruction technology applied to elucidate the features of organic reef reservoirs in the Changxing formation from Yuanba gas field shows that the seismic record reconstructed by high frequency signal can adequately describe the internal properties of organic reef reservoirs. Furthermore, the root mean square amplitude ratio of both low and high frequency data obtained from the reconstructed seismic data clearly show spatial distribution of gas and water in reef reservoirs.

8

Identification, characterisation and expression analysis of MADS-box genes in sweetpotato wild relative Ipomoea trifida

100%

Zhu P. , Dong T. , Xu T. , Kang H.

Acta Physiologiae Plantarum

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2020

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tom 42

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nr 11

9

Progressive collapse test of ship structures in waves

100%

Pei Z. , Xu T. , Wu W.

Polish Maritime Research

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2018

|

tom S 3

91--98

EN

The external loads and structural ultimate strength are two important aspects for the safety of ship hull girder. It may collapse in case the structural capacity is less than the external forces in extreme seas. In the present research, progressive collapse test is performed to investigate the collapse mechanism of ship structure in waves. External load with time history and corresponding structural collapse behavior are measured and discussed to demonstrate the interaction of fluid and structures.

10

Efficient in vitro plant regeneration of Pinellia ternata [Thunb] Breit

100%

Xu T. , Zhang L. , Sun X. , Tang K.

Acta Biologica Cracoviensia. Series Botanica

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2005

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tom 47

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nr 2

EN

An efficient plant regeneration system for Pinellia ternata (Thunb) Breit, an important wild Chinese herb, was established. The investigated factors influencing callus induction and plant regeneration included sterilizing agents, explant type, culture medium, and combinations of plant growth regulators in the medium. Ten min treatment of explants with 0.1% HgCl2 was more suitable for sterilization of tuber explants than NaCIO and H2O2. Tubers as explants were superior to leaves and petioles, and MS medium was better than N6 and White’s media. It was found that 9.1 µM 2,4-dichlorophenoxyacetic acid (2,4-D) plus 4.4 µM 6-benzyladenine (BA) in the medium was the best hormone combination for promoting callus induction. The highest shoot regeneration frequency (99%) was achieved from callus cultured on MS medium supplemented with 9.3 µM kinetin (KN) and 2.3 µM 2,4-D. The rooted shoots were successfully transplanted in soil, with over 95% survival. Establishment of an efficient plant regeneration procedure provides a basis for rapid in vitro propagation of P. ternata, which is in great demand in China, and represents an excellent tool for further work on its genetic manipulation.

11

The Comparison Study on AIS Signal Reception Rate with Directional Antenna and Omni Antenna

88%

Xu T. , Hu Q. , Xiang Z. , Yang C. , Wang D.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

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2016

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tom Vol. 10, no. 2

205--211

EN

With the wide use of AIS system in the world, especially in ports and the waters with heavy traffic, AIS message loss may be related to environmental conditions, obstacle, limitation of VHF technology and AIS network overload, thereby reducing the AIS signal successful reception rate. This paper selected typical AIS data received by Yagi and Omni antennas at the same time in specific waters, uses grid and AIS data recovery technology, establishes the AIS signal coverage model, analyzes signal reception rate of Yagi antenna and Omni antenna of AIS base station, and verified the superiority of Yagi antenna in AIS signal reception rate.

12

A study and application of high-resolution methods for reef reservoir identification

88%

Yan L. , Cheng B. , Xu T. , Wei S. , Qian Z.

Acta Geophysica

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2017

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tom Vol. 65, no. 5

907--917

EN

Reefs represent a special type of carbonate trap that plays a key role in the migration, accumulation, and formation of a reservoir. They have commonly been the targets of exploration and development. However, reefs have complex interior structures and easily grow as thin, interbedded geological frames with reef microfacies that include the cap, core, and base of the reef. Because of the inherent drawbacks of seismic signals, including their low frequencies and narrow bandwidths, it is difficult to accurately identify reef reservoirs. Fortunately, the seismic frequency, phase, energy, waveform and other dynamic and geometrical properties can be used to compensate for the energy, expand the frequency bandwidth, and decompose and reconstruct the wavelet to obtain high-resolution seismic data. These data can highlight certain seismic responses of reefs, including boundary reflections, dome-shaped reflections from the reef outline, strong reflections from the reef cap, reflections from the reef bottom, and onlap reflections from the reef flanks. Some impedance response regularities, such as the lower impedance of the reef cap relative to the reef core and biodetritus beach and the fluctuating impedance of the reef-flat complex, are observed by combining log data with geological and high-resolution seismic data for a reef reservoir inversion. These methods were applied to the Changxing Formation in the Yuanba Gas Field. Good prediction results were obtained with a high consistency between the log and seismic data in a comparative analysis with the original seismic data and well logs.

13

Microstructure and Mechanical Behavior of Mg-0.5Si-xSn Alloys

88%

Fu X. , Yang Y. , Ma Q. Y. , Peng X. , Xu T.

Archives of Foundry Engineering

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2017

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tom Vol. 17, iss. 4

179--184

EN

Mg-0.5Si-xSn (x=0.95, 2.9, 5.02wt.%) alloys were cast and extruded at 593K (320 ºC) with an extrusion ratio of 25. The microstructure and mechanical properties of as-cast and extruded test alloys were investigated by OM, SEM, XRD and tensile tests. The experimental results indicate that the microstructure of the Mg-0.5Si-xSn alloys consists of primary α-Mg dendrites and an interdendritic eutectic containing α-Mg, Mg2Si and Mg2Sn. There is no coarse primary Mg2Si phase in the test alloys due to low Si content. With the increase in the Sn content, the Mg2Si phase was refined. The shape of Mg2Si phase was changed from branch to short bar, and the size of them were reduced. The ultimate tensile strength and yield strength of Mg-0.52Si-2.9Sn alloy at the temperature of 473K (200 ºC) reach 133MPa and 112MPa respectively. Refined eutectic Mg2Si phase and dispersed Mg2Sn phase with good elevated temperature stability are beneficial to improve the elevated temperature performance of the alloys. However, with the excess addition of Sn, large block-like Mg2Sn appears around the grain boundary leading to lower mechanical properties.

14

Pinellia ternata agglutinin produced in Bombyx mori cells exhibits bioactivity

88%

Xu T. , Wang B. , Wang L. , Zhang Y. , Lv Z.

Acta Biochimica Polonica

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2012

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tom 59

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nr 2

EN

Pinellia ternata agglutinin (PTA) is highly homologous to many other monocot mannose-binding lectins which reportedly possess antitumor activities. Its production in silkworm cells has great application potential because the baculovirus expression system can produce post-translationally modified proteins at low cost. In the current study, the pta gene was cloned and expressed in silkworm cells, and the expressed protein was analyzed using a hemagglutination assay. A preliminary in vitro study on its anti-proliferative activity was performed. The results show that the recombinant PTA with an apparent molecular mass of 29 kDa can hemagglutinate rabbit erythrocytes and this activity can be inhibited by D-mannan at a low concentration. In addition, the recombinant hemagglutinin exhibited a dose-dependent anti-proliferative activity on hepatoma cells. The results of the current study suggest that PTA and other important bioactive proteins could be produced by silkworm bioreactor for biomedicine research and application.

15

The toxicity of cerium nitrate to Elodea canadensis: subcellular distribution, chemical forms and physiological effects

75%

Chu W. Y. , Cai S. J. , Fu Y. Y. , Li F. F. , Xu T. , Qiu H. , Xu Q. S.

Acta Physiologiae Plantarum

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2014

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tom 36

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nr 09

EN

The rare earth elements are increasingly being used as trace supplements in different fields. In this study, subcellular distribution, the chemical forms and toxicity of cerium (Ce) were evaluated for Elodea canadensis. The effect of Ce (5–20 mg L⁻¹) applied for 7 days was assessed by measuring changes in the nutrient elements, photosynthetic pigments, malondialdehyde and antioxidant systems. Ce accumulation was greatest in the cell walls, followed by the organelles and the soluble fraction. Ce levels were higher in cellulose and pectin than in other biomacromolecules. The toxic effects caused by Ce were shown by a reduction in photosynthetic pigments, disruption of nutrient elements, and increases in MDA content. E. canadensis shows Ce-induced oxidative stress by modulating antioxidant enzymes, such as guaiacol peroxidase and catalase. Elevated Ce levels may represent a potential risk for aquatic ecosystems.

16

Numerical study on failure behavior of brittle rock specimen containing pre-existing combined flaws under different confining pressure

75%

Yang S. Q. , Xu T. , He L. , Jing H. W. , Wen S. , Yu Q. L.

Archives of Civil and Mechanical Engineering

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2015

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tom Vol. 15, no. 4

1085--1097

EN

To understand deeply the fracture mechanism of brittle rock material, the rock specimen containing combined flaws (two square holes and one pre-existing fissure) with seven different fissure angles is carried out the numerical simulation by RFPA2D. Numerically simulated results show a good agreement with the experimental results. The crack coalescence behavior of specimen containing combined flaws under uniaxial compression is summarized, which is closely dependent to fissure angle. The stable propagation of original cracks does not lead to a larger AE event, but the coalescence of new cracks causes a larger AE event. The peak strength of specimen containing combined flaws increases with the confining pressure. According to the linear Mohr–Coulomb criterion, the cohesion and internal friction angle of specimen containing combined flaws are obtained, which is found to take on a distinct nonlinear relation with the fissure angle. The accumulated AE events decreases as the confining pressure increases from 0 to 30 MPa, which results mainly from the restraining of higher confining pressures on the initiation and propagation of tensile cracks at the fissure tips and nearby double squares.

17

Review of the Photodecomposition of Some Important Energetic Materials

75%

Sun Y. , Shu Y. , Xu T. , Shui M. , Zhao Z. , Gu Y. , Wang X.

Central European Journal of Energetic Materials

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2012

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tom Vol. 9, nr 4

411-423

EN

The photodecomposition mechanisms of energetic materials vary with molecular structure, photodissociation wavelength, the phase of the material, experimental pressure and temperature etc. In this paper, the significant progress on photodecomposition studies of some important energetic materials achieved in recent years is introduced in detail, including nitromethane, DMNA (dimethylnitramine), TATB (1,3,5-triamino-2,4,6-trinitrobenzene), RDX (hexahydro-1,3,5-trinitro-1,3,5-triazine), HMX (1,3,5,7-tetranitro-1,3,5,7- tetrazacycloctane) and CL-20 (2,4,6,8,10,12-hexanitrohexaazaisowurtzitane). The difficulties and prospects of photodecomposition research of energetic materials are also indicated.

18

A light and electron microscopy study of the yak placentome

75%

Xu T. , Liu B. , Cui Y. , He J. , Fan J. , Yu S.

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nr 4

EN

Background and Materials and methods: In order to clarify and reveal the morphological characteristics of yak placentomes, placentomes obtained from 151 to 180 days of pregnant yaks were observed using light microscopy and scanning and transmission electron microscopy. Results: The results indicated that sessile, dome-shaped yak placentomes seemed to have a relatively complex villous-crypt architecture pattern. There was a straight maternal plate beneath the placentome. Plentiful uterine glands and a dense cellular layer were present in the endometrium lamina propria close to the maternal plate. Trophoblast giant cells appeared to have similar ultrastructure features to these in other ruminants, including abundant mitochondria, an extensive array of rough endoplasmic reticulum, advanced Golgi complex and many specific secretory granules. Trophoblast giant cells could also secrete neutral and acid glycoconjugates. Furthermore, numerous glycoconjugates were distributed in the connective zones between mononuclear trophoblast cells and crypt epithelial cells as well as in maternal connective tissues. Mononucleate trophoblast cells, which had abundant microvilli that interdigitated with the corresponding microvilli arising from the crypt epithelial cells, had numerous mitochondria and vesicles, but there were no glycoconjugates. Conclusions: The morphological structures of yak placentomes were similar to those of other bovid genera; however, certain differences were observed. These findings might provide morphological evidence for evolutionary relationships between different bovid genera. (Folia Morphol 2019; 78, 4: 818–826)

19

Quantification of potential flood inundation areas in the marsh wetland of Honghe National Natural Reserve, Northeast China

75%

Liu Z. , Zhao L. , Xu T. , Bu F. , Liu X. , Zhou D.

International Journal of Ecohydrology and Hydrobiology

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2018

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tom 18

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nr 4

20

Generation and characterization of a monoclonal antibody against duck Tembusu virus envelope protein

63%

Han K. , Zhao D. , Liu Y. , Liu Q. , Huang X. , Yang J. , Bi K. , Xu T. , Li Y.

Polish Journal of Veterinary Sciences

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2016

|

tom 19

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nr 4

EN

Duck Tembusu virus (DTMUV) is a newly emerging pathogenic flavivirus that has caused massive economic losses to the duck industry in China. Envelope (E) protein of DTMUV is an important structural protein, which is able to induce protective immune response in target animals and can be used as specific serological diagnosis tool. In this study, a novel monoclonal antibody, designated mAb 3E9, was generated against DTMUV E protein. It is positive in indirect ELISA against both His-E protein and the purified whole viral antigen. Also, this mAb showed positive reaction with DTMUV in Western blot and indirect immunofluorescence assay, and the isotype was IgG1. End-point neutralizing assay performed in BHK-21 cells revealed that the neutralization titer of 3E9 against DTMUV JS804 strain reached 1:50. Furthermore, functional studies revealed that 3E9 blocks infection of DTMUV at a step on viral attachment. The anti-E mAbs produced in the present work may be valuable in developing an antigen-capture ELISA test for antigen detection or a competitive ELISA test for antibody detection or therapeutic medicine for DTMUV in poultry.