Wyniki wyszukiwania - Biblioteka Nauki

1

Enrichment capacity of lead in water by aquatic plants

100%

Ma Q. , Peng Y. , Zhang J. , Ji M.

Polish Journal of Environmental Studies

|

2019

|

tom 28

|

nr 4

EN

Phytoremediation is a promising, low-cost and environmentally friendly technology. By simulating different concentrations of Pb, Pb+Zn and Pb+EDTA in aqueous solutions, taking Acorus calamus, Eichhornia crassipes and Iris tectorum as experimental material, hydroponics was used to study the enrichment of aquatic plants to Pb in water under different conditions. The results show that Eichhornia crassipes has the best bioconcentration capacity, Acorus calamus has good bioconcentration and Iris tectorum has weak bioconcentration. The bioconcentration factors (BCFs) are more than 1 and the BCFs of the underground parts are greater than that of the aboveground parts. However, the translocation factors (TFs) are less than 1. The presence of Zn enhances the enrichment of the aquatic plants to Pb. The presence of EDTA reduces the enrichment, but promotes the transfer of Pb from underground parts to aboveground parts. All of the conclusions can provide reference for the application of aquatic plants for Phytoremediation of Pb.

2

An optimization approach to the intermodal transportation network in fruit cold chain, considering cost, quality degradation and carbon dioxide footprint

100%

Ma Q. , Wang W. , Peng Y. , Song X.

Polish Maritime Research

|

2018

|

tom nr 1

61--69

EN

This model optimizes port hinterland intermodal refrigerated container flows , considering both cost and quality degradation, which is distinctive from the previous literature content in a way that it quantifies the influence of carbon dioxide (CO2) emission in different setting temperature on intermodal network planning. The primary contribution of this paper is that the model is beneficial not only to shippers and customers for the novel service design, but also offer , for policy-makers of the government, insights to develop inland transport infrastructures in consideration of intermodal transportation. The majority of models of multimodal system have been established with an objective of cost minimization for normal commodities. As the food quality is possible to be influenced by varying duration time required for the storage and transportation, and transportation accompanied with refrigeration producing more CO2 emission, this paper aims to address cost minimization and quality degradation minimization within the constraint of CO2 footprint. To achieve this aim, we put the quality degradation model in a mixed-integer linear programming model used for intermodal network planning for cold chain. The example of Dalian Port and Yingkou Port offer insight into trade-offs between transportation temperature and transport mode considering CO2 footprint. Furthermore, the model can offer a useful reference for other regions with the demand for different imported food, which requires an uninterrupted cold chain during the transportation and storage.

3

An unconditionally positive and global stability preserving NSFD scheme for an epidemic model with vaccination

100%

Ding D. , Ma Q. , Ding X.

International Journal of Applied Mathematics and Computer Science

|

2014

|

tom Vol. 24, no. 3

635--646

EN

In this paper, a NonStandard Finite Difference (NSFD) scheme is constructed, which can be used to determine numerical solutions for an epidemic model with vaccination. Here the NSFD method is employed to derive a set of difference equations for the epidemic model with vaccination. We show that difference equations have the same dynamics as the original differential system, such as the positivity of the solutions and the stability of the equilibria, without being restricted by the time step. Our proof of global stability utilizes the method of Lyapunov functions. Numerical simulation illustrates the effectiveness of our results.

4

An optimization approach to the intermodal transportation network in fruit cold chain, considering cost, quality degradation and carbon dioxide footprint

100%

Ma Q. , Wang W. , Peng Y. , Song X.

Polish Maritime Research

|

2018

|

tom 25

|

nr 1

EN

This model optimizes port hinterland intermodal refrigerated container flows , considering both cost and quality degradation, which is distinctive from the previous literature content in a way that it quantifies the influence of carbon dioxide (CO2) emission in different setting temperature on intermodal network planning. The primary contribution of this paper is that the model is beneficial not only to shippers and customers for the novel service design, but also offer , for policy-makers of the government, insights to develop inland transport infrastructures in consideration of intermodal transportation. The majority of models of multimodal system have been established with an objective of cost minimization for normal commodities. As the food quality is possible to be influenced by varying duration time required for the storage and transportation, and transportation accompanied with refrigeration producing more CO2 emission, this paper aims to address cost minimization and quality degradation minimization within the constraint of CO2 footprint. To achieve this aim, we put the quality degradation model in a mixed-integer linear programming model used for intermodal network planning for cold chain. The example of Dalian Port and Yingkou Port offer insight into trade-offs between transportation temperature and transport mode considering CO2 footprint. Furthermore, the model can offer a useful reference for other regions with the demand for different imported food, which requires an uninterrupted cold chain during the transportation and storage

5

Dynamic Balance Optimisation for the Middle Shaft System of a Cotton Comber Based on ADAMS

100%

Xu B. , Ma Q. , Liu X.

Fibres & Textiles in Eastern Europe

|

2012

|

tom Vol. 20, no. 3 (92)

43--45

EN

For the vibration problem of a cotton comber, a model of the middle shaft system of a headstock was built using SOLIDWORKS software. It was found that the vibration was mainly caused by the shifting of the centroid. Then a dynamic optimisation model was established according to the dynamic balancing theory using the revolving method. The installment of the middle shaft system was optimised using ADAMS software with the aim of minimising its counterforce. The optimal value of the flange plate and timing regulation plan are given correspondingly. The results show that the noise and vibration of the comber CM500 are decreased significantly.

PL

Dla rozważenia problemu drgań przędzarki bawełniarskiej, opracowano model zespołu wału środkowego głowicy wykorzystując program SOLIDWORKS. Stwierdzono, że wibracje powstają głównie przez przesunięcie środka ciężkości. Opracowano dynamiczny model optymizacji drgań zgodnie z teorią dynamicznego równoważenia. Opracowano sposób zamocowania wału z wykorzystaniem programu ADAMS, przyjmując jako kryterium minimum siły reakcji. Podano parametry zamocowania oraz schemat regulacji. Stwierdzono, że po optymalizacji wartość drgań i hałasu została wyraźnie zmniejszona.

6

Studies on the Melt Spinning Process of Square 8-hole Hollow Polyester Fibre

100%

Feng P. , Pan J. , Ma Q. , Yang C.

Fibres & Textiles in Eastern Europe

|

2018

|

tom Vol. 26, no. 3 (129)

14--16

EN

In this paper, the shape of the spinneret capillary was discussed, and optimized spinneret capillaries were successfully processed by a computer numerical control processing method which takes a C-shape silver electrode as the basic unit. Based on the optimised spinning process, a new type of square 8-hole hollow PET fibre was prepared by the experimental method.

PL

W artykule omówiono i zoptymalizowano kształt kapilary przędzalniczej, przy użyciu komputerowej metody sterowania numerycznego i zastosowaniem srebrnej elektrody w kształcie litery C. W oparciu o zoptymalizowany proces przędzenia opracowano nowy rodzaj kwadratowych 8-otworowych włókien poliestrowych z pustymi przestrzeniami.

7

MiR-140-5p inhibits the proliferation, migration and invasion of vascular smooth muscle cells by suppressing the expression of NCKAP1

100%

Ma Q. , Liu J. , Li C. , Wang D.

Folia Histochemica et Cytobiologica

|

2021

|

tom 59

|

nr 1

8

Order estimation of japanese paragraphs by supervised machine learning and various textual features

100%

Murata M. , Ito S. , Tokuhisa M. , Ma Q.

Journal of Artificial Intelligence and Soft Computing Research

|

2015

|

tom Vol. 5, No. 4

247--255

EN

In this paper, we propose a method to estimate the order of paragraphs by supervised machine learning. We use a support vector machine (SVM) for supervised machine learning. The estimation of paragraph order is useful for sentence generation and sentence correction. The proposed method obtained a high accuracy (0.84) in the order estimation experiments of the first two paragraphs of an article. In addition, it obtained a higher accuracy than the baseline method in the experiments using two paragraphs of an article. We performed feature analysis and we found that adnominals, conjunctions, and dates were effective for the order estimation of the first two paragraphs, and the ratio of new words and the similarity between the preceding paragraphs and an estimated paragraph were effective for the order estimation of all pairs of paragraphs.

9

Spectral analysis for GNSS coordinate time series using chirp fourier transform

100%

Feng S. , Bo W. , Ma Q. , Wang Z.

|

tom Vol. 65, no. 6

1111--1118

EN

Spectral analysis for global navigation satellite system (GNSS) coordinate time series provides a principal tool to understand the intrinsic mechanism that affects tectonic movements. Spectral analysis methods such as the fast Fourier transform, Lomb–Scargle spectrum, evolutionary power spectrum, wavelet power spectrum, etc. are used to find periodic characteristics in time series. Among spectral analysis methods, the chirp Fourier transform (CFT) with less stringent requirements is tested with synthetic and actual GNSS coordinate time series, which proves the accuracy and efficiency of the method. With the length of series only limited to even numbers, CFT provides a convenient tool for windowed spectral analysis. The results of ideal synthetic data prove CFT accurate and efficient, while the results of actual data show that CFT is usable to derive periodic information from GNSS coordinate time series.

10

The AtDREB1A transcription factor up-regulates expression of a vernalization pathway gene, GmVRN1-like, delaying flowering in soybean

89%

Suo H. , Lii J. , Ma Q. , Ma Q. , Yang C. Y. , Zhang X. X. , Meng X. , Huang S. , Nian H.

Acta Physiologiae Plantarum

|

2016

|

tom 38

|

nr 06

11

Molecular characterization of the genomic region harboring the BYDV-resistance gene Bdv2 in wheat

88%

Gao L. , Ma Q. , Liu Y. , Xin Z. , Zhang Z.

Journal of Applied Genetics

|

2009

|

tom 50

|

nr 2

89-98

EN

Barley yellow dwarf virus (BYDV) can cause significant losses of wheat worldwide. The long arm segment of Thinopyrum intermedium chromosome 7Ai#1 carrying the BYDV resistance gene Bdv2 was translocated to the distal region of the long arm of wheat chromosome 7D in translocation line Yw642. In this study, 40 wheat EST sequences located in the distal region of 7DL were explored to identify specific PCR markers for the Bdv2 region on the basis of the homoeologous relationship between wheat chromosome 7D and Th.intermedium chromosome 7Ai#1. Our results revealed 8 novel EST-PCR markers specific to the Bdv2 region, including 5 EST-STS markers of BE404744, BE498985, BE591497, BG606695 and BQ161842, and 3 EST-SSCP markers of BE404953, BG312663 and BE498985. These EST-PCR markers could distinguish Bdv2 from another BYDV-resistance gene located on Th.intermedium chromosome 2Ai-2. These specific bands for the Bdv2 region were further cloned and sequenced. The sequencing analysis indicated that the specific sequences for the Bdv2 region were highly homologous with the original wheat EST sequences that were used to design primers, and encode respectively a protein kinase, P450, centrin, transducin, and a hypothetical protein. This study created a starting point for eventual cloning of the Bdv2 gene and understanding the defense mechanism.

12

3-D simulation of vertical-axial tidal current turbine

88%

Zhang Z. , Ma Y. , Jiang J. , Liu W. , Ma Q.

Polish Maritime Research

|

2016

|

tom 23

|

nr 4

EN

Vertical-axial tidal current turbine is the key for the energy converter, which has the advantages of simple structure, adaptability to flow and uncomplex convection device. It has become the hot point for research and application recently. At present, the study on the hydrodynamic performance of vertical-axial tidal current turbine is almost on 2-D numerical simulation, without the consideration of 3-D effect. CFD (Computational Fluid Dynamics) method and blade optimal control technique are used to improve accuracy in the prediction of tidal current turbine hydrodynamic performance. Numerical simulation of vertical-axial tidal current turbine is validated. Fixed and variable deflection angle turbine are comparatively studied to analysis the influence of 3-D effect and the character of fluid field and pressure field. The method, put the plate on the end of blade, of reduce the energy loss caused by 3-D effect is proposed. The 3-D CFD numerical model of vertical-axial tidal current turbine hydrodynamic performance in this study may provide theoretical, methodical and technical reference for the optimal design of turbine

13

VvWRKY13 enhances ABA biosynthesis in Vitis vinifera

88%

Hao J. , Ma Q. , Hou L. , Zhao F. , Liu X.

Acta Societatis Botanicorum Poloniae

|

2017

|

tom 86

|

nr 2

EN

Abscisic acid (ABA) plays critical roles in plant growth and development as well as in plants’ responses to abiotic stresses. We previously isolated VvWRKY13, a novel transcription factor, from Vitis vinifera (grapevine), and here we present evidence that VvWRKY13 may regulate ABA biosynthesis in plants. When VvWRKY13 was ectopically expressed in Arabidopsis, the transgenic lines showed delayed seed germination, smaller stomatal aperture size, and several other phenotypic changes, indicating elevated ABA levels in these plants. Sequence analysis of several genes that are involved in grapevine ABA synthetic pathway identified WRKY-specific binding elements (W-box or W-like box) in the promoter regions. Indeed, transient overexpression of VvWRKY13 in grapevine leaves significantly increased the transcript levels of ABA synthetic pathway genes. Taken together, we conclude that VvWRKY13 may promote ABA production by activating genes in the ABA synthetic pathway.

14

3-D simulation of vertical-axial tidal current turbine

88%

Zhang Z. , Ma Y. , Jiang J. , Liu W. , Ma Q.

|

tom nr 4

73--83

EN

Vertical-axial tidal current turbine is the key for the energy converter, which has the advantages of simple structure, adaptability to flow and uncomplex convection device. It has become the hot point for research and application recently. At present, the study on the hydrodynamic performance of vertical-axial tidal current turbine is almost on 2-D numerical simulation, without the consideration of 3-D effect. CFD (Computational Fluid Dynamics) method and blade optimal control technique are used to improve accuracy in the prediction of tidal current turbine hydrodynamic performance. Numerical simulation of vertical-axial tidal current turbine is validated. Fixed and variable deflection angle turbine are comparatively studied to analysis the influence of 3-D effect and the character of fluid field and pressure field. The method, put the plate on the end of blade, of reduce the energy loss caused by 3-D effect is proposed. The 3-D CFD numerical model of vertical-axial tidal current turbine hydrodynamic performance in this study may provide theoretical, methodical and technical reference for the optimal design of turbine.

15

Production of bacteriocin E50-52 by small ubiquitin-related modifier fusion in Escherichia coli

88%

Wang Q. , Fu W. , Ma Q. , Yu Z. , Zhang R.

Polish Journal of Microbiology

|

2013

|

tom 62

|

nr 4

EN

Bacteriocin E50-52, a class IIa bacteriocin with a wide antibacterial spectrum, and has a huge potential to be a substitute for conventional antibiotics. In this research, the bacteriocin E50-52 gene was cloned into the expression vector pET SUMO (small ubiquitin-related modifier) and introduced into Escherichia coli BL21 (DE3). The recombinant fusion protein SUMO-bacteriocin E50-52 expressed in a soluble form was purified to a purity of more than 90% by Ni-NTA sepharose column and 117 mg fusion protein was obtained per liter of fermentation culture. The fusion protein was cleaved with SUMO protease and re-applied to a Ni-NTA Sepharose column. Finally, about 16 mg recombinant bacteriocin E50-52 (rbE50-52) was obtained from a 1-liter fermentation culture with no less than 95% purity. The rbE50-52 had similar antimicrobial properties and molecular weight as the native bacteriocin E50-52 and showed very low hemolytic activity.

16

Study on Dissociation of Nano Bamboo Extractives

88%

Zhang Z. , Xue Q. , Huang K. , Ma Q. , Guo Y.

Przegląd Elektrotechniczny

|

2013

|

tom R. 89, nr 3b

212--215

EN

Bamboo, which is considered one of the best renewable resources on the planet, has widely been used. However, the extractives has a serious influence on bamboo processing, pulping and papermaking. Therefore, bamboo extractives of Phyllostachys heterocycla was done in the different solution, and studied by GC-MS. The results showed that the optimal extracting time of ethanol extraction, benzene/ethanol extraction and acetic ether extraction reached the largest leaching rate of bamboo extractives was 8h, 7h and 6h, respectively. The bamboo benzene/alcohol extractives had a main retention time between 30-40 min and contained 55 components. The acetic ether extractives had a main retention time between 20-40 min and contain 46 components. The ethanol extractives had a main retention time below 40 min and contain 28 components,.

PL

W artykule przedstawiono wyniki analiz drewna bambusowego, pod względem wpływu jego ekstraktów na proces przetwórczy. W badaniu wykorzystano metodę GC-MS, na podstawie której wyznaczono szybkość wydobycia poszczególnych substancji. Dodatkowo określono skład każdego z wydobytych ekstraktów.

17

Effects of external supplied sucrose on the uptake and metabolism of glycine by pakchoi (Brassica chinensis L.)

88%

Ma Q. , Ma J. , Sun Y. , Chen J. , Wu L.

Acta Physiologiae Plantarum

|

2017

|

tom 39

|

nr 08

18

The Reinforcement of the TNT System by a Newly-designed GAP-based Polyurethane-Urea: a Molecular Simulation Investigation

75%

Qian W. , Shu Y. , Ma Q. , Li H. , Wang S. , Chen X.

Central European Journal of Energetic Materials

|

2016

|

tom Vol. 13, no. 2

411--426

EN

A glycidyl azide (GAP)-based polyurethane-urea (PUU) modifier used in the 1,3,5-trinitrotoluene (TNT)-based composite explosive was investigated by molecular simulation. Inter-molecular interactions were investigated using quantum chemistry calculation on the dimer of TNT and GAP-PUU, and attractive forces were found between the two molecules. The cohesive energy densities and the solubility parameters were obtained through molecular dynamics simulations combined with thermodynamic calculations on the TNT and GAP-PUU amorphous cell models, and the miscibility of the modifier in molten TNT was predicted to be good. The interaction energies and the mechanical properties were then obtained by molecular simulations and mechanical calculations on the solid-phase models of the GAP-PUU with TNT along three crystalline directions, and an improvement in the mechanical properties was predicted.

19

Microstructure and Mechanical Properties of Duplex Structured Mg-Li-Zn-Y Alloys

75%

Su J. , Yang Y. , Fu X. , Ma Q. , Ren F. , Peng X.

Archives of Foundry Engineering

|

2018

|

tom Vol. 18, iss. 1

181--185

EN

As-cast Mg-6Li-0.3Zn-0.6Y and Mg-6Li-1.2Zn-1.2Y (wt%) alloys were prepared and extruded at 260 ºC with an extrusion ratio of 25. The microstructure and mechanical behavior of as-cast and extruded alloys are reported and discussed. The results show that Mg-6Li-1.2Zn- 1.2Y alloy is composed of α-Mg, β-Li, and W-Mg3Zn3Y2 phases while Mg-6Li-0.3Zn-0.6Y alloy contains α-Mg, β-Li, W-Mg3Zn3Y2 phase and X-Mg12ZnY. After hot extrusion, the microstructure of specimens is refined and the average grains size of extruded alloys is 15 μm. Dynamic recrystallization occurs during the extrusion, leading to grain refinement of test alloys. Both the strength and elongation of test alloys are improved by extrusion. The extruded Mg-6Li-0.3Zn-0.6Y alloy possesses an ultimate strength of 225 MPa with an elongation of 18% while the strength and elongation of Mg-6Li-1.2Zn-1.2Y alloy are 206 MPa and 28%, respectively. The X-phase in Mg-6Li-0.3Zn- 0.6Y is beneficial to the improvement of strength, but will lead to the decrease of ductility.

20

A Facile Synthesis of 3,3'-Dinitro-5,5'-diamino-bi-1,2,4-triazole and a Study of Its Thermal Decomposition

75%

Ma Q. , Lu H. , Qu Y. , Liao L. , Li J. , Fan G. , Chen Y.

Central European Journal of Energetic Materials

|

2017

|

tom Vol. 14, no. 2

281--295

EN

3,3’-Dinitro-5,5’-diamino-bi-1,2,4-triazole (DABNT) was synthesized by a facile method and its crystalline density was determined as 1.839 g·cm−3 at 293(2) K by X-ray diffraction. Its thermal decomposition kinetics and mechanism were studied by means of differential scanning calorimetry-thermogravimetry (DCS-TG), in situ thermolysis by rapid-scan Fourier transform infrared spectroscopy (RSFTIR) and simultaneous TG-IR technology. The results showed that the apparent activation energies obtained by the Kissinger, Ozawa and Starink methods were 122.9 kJ·mol−1, 123.2 kJ·mol−1 and 123.5 kJ·mol−1, respectively. The thermodynamic parameters of ΔS≠, ΔH≠ and ΔG≠ were −37.5 J·K−1·mol−1, 118.4 kJ·mol−1 and 138.7 kJ·mol−1, respectively. The decomposition reaction process of DABNT starts with the transformation from a primary amine to a secondary amine and then the loss of one nitro-group from the DABNT structure. Gaseous products, such as N2O and H2O, were detected from decomposition in the range of 50-300 °C. Density functional theory (DFT) calculations were further employed to illustrate the decomposition mechanism. The above-mentioned information on the synthesis and thermal behaviour is quite useful for the scale-up and evaluation of the thermal safety of DABNT.