Wyniki wyszukiwania - Biblioteka Nauki

1

The port service ecosystem research based on the Lotka-Volterra model

100%

Li W. , Liu W. , Xu X. , Gao Z.

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2017

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tom S 3

86--94

EN

Under the new normal of China’s economy, the competition among the port enterprises is not only the competition of the core competence of the port, the port industry chain or the port supply chain, but also the competition of the port service ecosystem. In this paper, the concept and characteristics of the port service ecosystem is discussed, a hierarchical model of the port service ecosystem is constructed. As an extended logistic model, Lotka-Volterra model is applied to study the competitive co-evolution and mutually beneficial co-evolution of enterprises in the port service ecosystem. This paper simulates the co-evolution of enterprises in the port service ecosystem by using MATLAB programming. The simulation results show that the breadth of the niche of the enterprises is changing with the change of the competition coefficient and the coefficient of mutual benefit in the port service ecosystem. Based on that, some proposals are put forward to ensure the healthy and orderly development of the port service ecosystem.

2

Study of the Inclusion Complexes of Catecholamines with beta-Cyclodextrin by Cyclic Voltammetry

100%

Gao Z. , Wen X. L. , Li H. L.

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tom Vol. 76 / nr 7

1001-1007

EN

The inclusion complexes of catecholamines (dopamine, DA, and adrenaline, AD) with beta-cyclodextrin (beta-CD) have been studied by cyclic voltammetry (CV) using glassy carbon electrode (GCE) for expanding the potential window. The variations of peak potential and peak current were observed on cyclic voltammograms, when the electroactive guest molecules, DA and AD are complexed with beta-CD. Dissociation constants of cyclodextrin inclusion complexes have been calculated. The experimental results indicate that bothDAandADcan form a 1:1 inclusion complexes with beta-CD in aqueous solutions. It was observed that the light and oxygen sensitivity of the inclusion complex is much lower than those of the free catecholamines, which can be used to improve their storage and handling, and also widen their applications in pharmaceutical industry. Furthermore, it was found that their electrochemical oxidation in the aqueous solutions could be inhibited by beat-CD.

3

Exergy analysis of an externally-fired combined cycle power plant using the concept of avoidable thermodynamic inefficiencies

100%

Cziesla F. , Tsatsaronis G. , Gao Z.

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tom R. 101, z. 4-M

51--62

EN

The real thermodynamic inefficiencies in a thermal system are related to exergy destruction and exergy loss. An exergy analysis identifies the system components with the highest exergy destruction and the processes that cause them. However, only a part of the exergy destruction in a component can be avoided. A minimum exergy destruction rate for each system component is imposed by physical, technological, and economic constraints. The difference between the total and the unavoidable exergy destruction rate represents the avoidable exergy destruction rate, which provides a realistic measure of the potential for improving the thermodynamic efficiency of a component. This concept is applied to the exergetic analysis and evaluation of an externally-fired combined cycle power plant.

PL

W pracy przedstawiono analizę strat termodynamicznych w rzeczywistych układach cieplnych odnoszącą się do egzergii i umożliwiającą identyfikację elementów systemu wykazujących największe jej rozpraszanie. Wielkość rozpraszanej egzergii dla każdego składnika zależy od czynników fizycznych, technologicznych i ekonomicznych. Różnica pomiędzy całkowitym a niemożliwym do uniknięcia rozpraszaniem egzergii przedstawia możliwą do uniknięcia jej stratę i stanowi miarę możliwego zwiększenia efektywnej wydajności termodynamicznej elementu. Koncepcję tą zastosowano do analizy egzergii w systemach energetycznych z zewnętrzną komorą spalania.

4

Automatic Identification of Jacquard Warp-knitted Fabric Patterns Based on the Wavelet Transform

88%

Jiang G. M. , Zhang D. , Cong H. L. , Zhang A. L. , Gao Z.

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tom Vol. 22, no. 2 (104)

53--56

EN

In view of the fact that the design of jacquard warp knitting patterns is time-consuming, this paper proposes a rapid segmentation method to divide the multi-textural regions of jacquard warp-knitted fabric which could be used for automatic identification of fabric patterns to improve the efficiency of design. After pretreatment, the images scanned were decomposed by a two-layer two-dimensional wavelet transform and the standard deviations of five channels were extracted as the eigen values. Then, after giving the cluster centers, a multi-channel clustering was made combined with a K-means clustering algorithm. Finally the removal of noises caused by classification errors was needed , after which an accurate identification image was obtained. The experiments show that this method can achieve automatic texture segmentation of jacquard warp-knitted fabric with more than three textural regions. The identification results have high regional consistency, and the segmentation accuracy is up to 92%. The method can also adapt to a variety of mesh regions. Besides this, the approach is fast and can simplify craft personnel’s traditional process of pattern tracing classification when it is combined with CAD. Through this method, the efficiency of jacquard warp-knitted product designing can be improved a lot.

PL

Biorąc pod uwagę, że określenie wzorów żakardowych dzianin osnowowych jest czasochłonne, zastosowano metodę szybkiej segmentacji wzorów dla wydzielenia wielostrukturalnych rejonów dzianin, które mogłyby zostać wykorzystane dla automatycznej identyfikacji wzorów dzianin i usprawnieniu procesu projektowania. Po wstępnej obróbce zeskanowane obrazy zostają podzielone poprzez dwuwarstwową, dwuwymiarową transformacje typu „wavelet”, następnie określa się odchylenia standardowe dla pięciu kanałów i ekstrahuje się jako wartość własną. Następnie przeprowadza się wielowarstwową analizę klastrów opartą na specjalnym algorytmie. W końcu usuwa się szumy spowodowane przez błędy klasyfikacyjne co pozwala na dokładną identyfikację obrazów. Eksperymenty wykazują, że opracowana metoda pozwala na automatyczną segmentację struktury osnowowych dzianin żakardowych z więcej niż trzema regionami strukturalnymi. Opracowana metoda zapewnia identyfikację z dokładnością do 92% i znacznie usprawnia proces projektowania dzianin żakardowych.

5

Research on Improved LEACH Protocol of Wireless Sensor Networks

75%

Shan J. , Dong L. , Liao X. , Shao L. , Gao Z. , Gao Y.

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2013

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tom R. 89, nr 1b

75--77

EN

This investigation was performed to see if the improved LEACH protocol operates more effectively than the traditional LEACH protocol. The improved protocol adds energy factor and distance factor to the threshold T(n). The multi-hop routing algorithm of cluster head is introduced too, it based on the hop count and the remaining energy. MATLAB was used to simulate. The simulation data suggests that the death rate of nodes of the improved protocol was lower than the traditional one. It is concluded that the improved LEACH protocol can balance network load and extend the life-cycle of network.

PL

Zbadano efektywność pracy udoskonalonego, w stosunku do tradycyjnego, protokołu hierarchicznego klastrowania LEACH. Udoskonalenie protokołu polega na wprowadzeniu współczynników energii i odległości węzłów oraz wykorzystaniu ich przy obliczaniu wartości progowej T(n). Zastosowano również wielo-przeskokowy algorytm klastrowania węzła głównego. Algorytm działa na zasadzie liczenia przeskoków i zachowania energii. Do symulacji wykorzystano program MATLAB. Wyniki symulacji wykazują, że tempo uszkodzeń węzłów przy zastosowaniu udoskonalonego protokołu jest mniejsze niż w przypadku tradycyjnego. Podsumowując, udoskonalony protokół LEACH może zrównoważyć obciążenie i wydłużyć okres życia sieci.

6

Genome-wide identification of the auxin response factor (ARF ) gene family and expression analysis of its role associated with pistil development in Japanese apricot (Prunus mume Sieb. et Zucc)

75%

Song J. , Gao Z. , Huo X. , Sun H. , Xu Y. , Shi T. , Ni Z.

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nr 08

EN

Auxin has been widely implicated in various aspects of plant growth and development, including flower development. In order to further elucidate the role of auxin during flower development, especially on the pistil development process, auxin response factors (ARFs), an important component in auxin signalling pathway, were studied in the early flower buds of Japanese apricot (Prunus mume Sieb. et Zucc). In this study, a comprehensive overview of the ARF gene family in Japanese apricot is presented, including the chromosomal locations, phylogenetic relationships, gene structures, the domain and nuclear localization analysis. Seventeen Japanese apricot genes that encode ARF proteins (PmARFs) have been identified based on the genome sequence of Japanese apricot. Comparison of the expression of some PmARF genes between perfect and imperfect flower buds in Japanese apricot suggests that PmARFs, especially the PmARF13 and PmARF17 gene may be required for pistil development and function in Japanese apricot. These results will be useful for future functional analyses of the ARF family genes in plants.

7

Geometric Model for Multi-axial Warp-knitted Fabric Based on NURBS

75%

Jiang G. , Gu L. , Cong H. L. , Miao X. H. , Zhang A. , Gao Z.

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tom Vol. 22, no. 3 (105)

91--97

EN

Based on studying the constitution of yarn system and the geometric modality of relevant yarns in the multi-axial warp-knitted structure, 3D solid models of the loop yarns, insertion yarns and chopped strand mat in modern multi-axial warp-knitted fabrics were built to reflect the geometric structures of the three items by using NURBS curves and the principle of curved surfaces. Besides, OpenGL was employed to explore the corresponding 3D computer simulation system under the condition of VC++.NET, which could simulate the geometric model of multi-axial warp-knitted fabric. Meanwhile, through the selection of the unit cell of the fabric, the unit cell model of modern multi-axial warp-knitted fabric with chopped strand mat was developed and the relation between geometric parameters and process variables was deduced. The theoretical fibre volume fraction formula of modern multi-axial warp-knitted fabric with chopped strand mat was obtained as well. Furthermore, by using different specifications of fabric as samples, theoretical and experimental values of the fibre volume fraction were compared. The results revealed that there was good agreement between the theoretical and experimental values, which proved that the model was scientific and practical.

PL

Na podstawie badań struktury systemu przędz i geometrycznej modalności odpowiednich przędz w wieloosiowej dzianej strukturze osnowowej opracowano modele brył 3D przędz pętli, przędz wprowadzanych i struktur z włókien odcinkowych we współczesnych wieloosiowych dzianinach osnowowych w celu zobrazowania ich geometrycznych struktur dzięki zastosowaniu krzywych NURBS i reguł dotyczących zakrzywionych powierzchni. Oprócz tego zastosowano program OpenGL dla zbadania systemu symulacji komputerowej 3D przy warunkach VC++.NET, co pozwala na symulację geometrycznego modelu wieloosiowych dzianin osnowowych. Jednocześnie dzięki selekcji komórki podstawowej dzianiny opracowano model takiej komórki podstawowej dla konfiguracji wcześniej opisanej. Określono również zależności pomiędzy parametrami geometrycznymi a zmiennymi procesowymi. Uzyskano teoretyczną objętość włókien, następnie korzystając ze specyfikacji różnego rodzaju próbek określono zależności pomiędzy teoretycznymi i eksperymentalnymi wartościami objętości poszczególnych frakcji włókien. Wyniki wykazały, że istnieje zgodność pomiędzy teoretycznymi i eksperymentalnymi wartościami, co oznacza, że opracowany model jest naukowo uzasadniony i możliwy do stosowania w praktyce.

8

The effect of polyacrylic acid on the surface properties of calcite and fluorite aiming at their selective flotation

63%

Zhang C. , Gao Z. , Hu Y. , Sun W. , Tang H. , Yin Z. , He J. , Guan Q. , Zhu Y.

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tom Vol. 54, iss. 3

868--877

EN

In this study, the polyacrylic acid (PAA) was studied as a selective depressant for calcite in the selective flotation of fluorite and calcite, and the implications of this process for the separation of fluorite ore were studied using micro-flotation tests, and the results were analyzed with Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) analyses. The flotation tests indicated that the preferential adsorption of PAA onto calcite rather than sodium oleate (NaOl) could selectively depress the flotation of calcite, allowing its separation from fluorite at pH 7. The zeta potential of calcite became more negative with the addition of PAA rather than with NaOl. However, the characteristic features of PAA adsorption were not observed for fluorite, suggesting that NaOl preferentially adsorbed on the surface of fluorite, or that PAA could be replaced by NaOl on the fluorite surface. FT-IR and XPS analysis were utilized to obtain a better understanding of the mechanism by which PAA was more strongly adsorbed on the calcite surface than NaOl. This was revealed to occur through chemical bonding between the carboxyl group of PAA and the hydroxyl groups of the Ca species on the calcite surface, modifying the structure of the adsorbed layer. A possible adsorption mechanism, along with a postulated adsorption mode for the surface interaction between PAA and calcite, is proposed.

9

Pistil abortion in Japanese apricot (Prunus mume Sieb. et Zucc.): isolation and functional analysis of PmCCoAOMT gene

63%

Sun H. , Shi T. , Song J. , Xu Y. , Gao Z. , Song X. , Ni Z. , Cai B.

Acta Physiologiae Plantarum

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2016

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tom 38

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nr 05