Autor: Zhang, Yang - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Determination of Truck Maintenance Allocation Scheme Based on SA-GA
Autorzy:: Qiu, Jiandong
Ren, Wei
Tang, Minan
Ma, Panpan
Zhang, Yang
Tematy:: railway transportation
train-line
train depot
maintenance of railway trucks
renovations
repair schedule
SA-GA
transport kolejowy
linia kolejowa
zajezdnia kolejowa
konserwacja taboru kolejowego
prace remontowe
harmonogram remontów; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/2173924.pdf Link otwiera się w nowym oknie
Opis:: As an important department of railway transportation and production, large freight train depot is responsible for the regular overhaul and maintenance of railway trucks. The shunting operation of freight train depot covers the whole process of railway trucks entering, storing, overhauling and leaving the depot. It is an important step in the implementation of the maintenance operation. Usually, shunting personnel in the depot transport the trucks to be overhauled to the maintenance line by relying on the shunting operation plan, which is the key to determine the shunting operation plan according to the distribution relationship between vehicles and maintenance. Firstly, this paper analyzes the process of centralized shunting operation in the freight train depot and the factors affecting the time-consuming based on the research idea of flexible workshop scheduling problem. Then, on the premise that the proportion of the weight coefficient will have an impact on the time-consuming of truck busy and shunting in the shunting process, and with the goal of minimizing the time-consuming of truck maintenance busy and shunting, the allocation model between trucks and maintenance lines is established; In addition, an improved genetic algorithm is proposed to solve the established model; Finally, combined with the maintenance of railway trucks in a large freight train depot, an example analysis is carried out on this basis. The results demonstrate that using simulated annealing genetic algorithm to solve the model can obtain the allocation scheme between railway trucks and maintenance operation line. Under the influence of three different coefficients, compared with genetic algorithm, simulated annealing genetic algorithm can reduce the detention time of railway trucks in depot by 0.21%, 0.09% and 0.12% respectively, which is beneficial to reducing the detention time of maintenance vehicles in depot, It plays a positive role in improving the maintenance efficiency of trucks in the depot, and also provides new ideas for the research of railway truck shunting
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Research on AGV positioning method combined with IMU and UWB
Autorzy:: Qiu, Jiandong
Zhang, Yang
Tang, Minan
Ma, Panpan
Ran, Jiajia
Tematy:: intelligent storage system
extended Kalman filter
AGV
data fusion positioning
inertial navigation
inteligentny system przechowywania
rozszerzony filtr Kalmana
pozycjonowanie danych
nawigacja bezwładnościowa; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/2179826.pdf Link otwiera się w nowym oknie
Opis:: Aiming at the problem that automated guided vehicle (AGV) is difficult to locate accurately due to the influence of environment and time drift when it works in the indoor intelligent storage system. In this paper, an extended Kalman filtering (EKF) framework is designed. In order to make full use of the original ranging values of ultra wideband (UWB) and inertial measurement unit (IMU), the framework realizes the fusion positioning between UWB module and IMU module in a tight coupling manner, so as to ensure that the system can still work when the available base station signal is inaccurate. Firstly, for the problem that the traditional UWB positioning method is easily affected by the non-line of sight (NLOS) error in-doors, the calculated positioning coordinate value is unstable. With the help of different NLOS probability distribution curves of different obstacles, the weighted least square method is applied to the UWB positioning method to determine the positioning coordinate value of UWB, which improves the sudden change of AGV positioning coordinate in the static environment. Then the data fusion algorithm is optimized, and the error value of IMU and UWB coordinate is taken as the observation value of EKF, which reduces the influence of cumulative error on IMU positioning results, provides the global optimal estimation of the system optimal state, and improves the fusion positioning accuracy. Finally, the measured data of UWB and IMU systems in indoor complex environment are simulated in MATLAB. The experimental results show that when NLOS signal seriously affects the positioning effect, the UWB and IMU combined positioning system can provide more reliable positioning results than the single IMU positioning system. It improves the positioning accuracy of AGV and provides a new idea for indoor positioning mode.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: The effects of velvet antler polypeptides on the phenotype and related biological indicators of osteoarthritic rabbit chondrocytes
Autorzy:: Zhang, Zhengyao
Liu, Xiaofeng
Duan, Lengxin
Li, Xia
Zhang, Yang
Zhou, Qiuli
Tematy:: velvet antler polypeptides
MMP
osteoarthritic chondrocytes
apoptosis; Pokaż więcej
Wydawca:: Polskie Towarzystwo Biochemiczne
Powiązania:: https://bibliotekanauki.pl/articles/1039876.pdf Link otwiera się w nowym oknie
Opis:: Objective: To study the effects of velvet antler polypeptides (VAPs) on osteoarthritic chondrocytes (OCs) in rabbits. Methods: An osteoarthritic rabbit model was established according to Hulth's method. OCs were isolated and cultured for observation of the cell cycle. Cell proliferation was detected by MTT assay and the cell cycle was monitored by flow cytometry. The phenotype was determined by toluidine blue staining as well as immunohistochemical staining for collagen type II. The expression of MMP-1, MMP-3, MMP-13, TIMP-1, and collagen I and X mRNA by chondrocytes was assayed by RT-PCR. Results: The VAPs had no obvious proliferative effect on OCs and did not affect the cell cycle. However, they significantly reduced the proportion of early apoptotic cells in a dose-dependent manner. Further, VAPs inhibited the expression of collagen I and X mRNA and induced abnormal expression of MMP-1 and MMP-13 mRNA. VAPs had no significant effect on MMP-3 and TIMP-1 mRNA levels. The toluidine blue and collagen type II immunohistochemical staining intensities of VAP-treated chondrocytes were positively correlated with the concentration of VAPs used. Conclusion: VAPs had no significant effect on OC proliferation and the cell cycle, but did increase the glycosaminoglycan (GAG) and collagen type II expression levels in the extracellular matrix, and down-regulated collagen I and X mRNA expression. Treatment of cartilage cells with VAPs maintained their normal phenotype, inhibited matrix metalloproteinases (MMPs) secretion, kept the balance of cartilage matrix metabolism, and sustained an external environment where the cartilage cells could survive. Moreover, VAPs reduced the proportion of early apoptotic cells, suggesting that they may block the apoptotic pathway in OCs.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

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Skocz do pozycji: 5.

Tytuł:: The influence of hydraulic loading on biofilm properties in a subsurface wastewater infiltration system
Autorzy:: Zhang, L.
Yang, J.
Tematy:: subsurface wastewater infiltration system
biofilms
hydraulic loading
spatial distribution
biofilm properties; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/205392.pdf Link otwiera się w nowym oknie
Opis:: In this study, a pilot-scale subsurface wastewater infiltration system (SWIS) was deployed to study landscape water treatment. The goal of the study was to investigate the effects of hydraulic loading on pollutant removal and the spatial distribution of biofilm properties in SWIS. Results showed that the efficiencies of chemical oxygen demand (COD), total nitrogen (TN) and total phosphorus (TP) removal degraded as hydraulic loading increased. Furthermore, quantities of the biofilm properties parameter s increased with the hydraulic loading. Polysaccharide and protein levels ranged from 560 to 1110 μg/g filler and 60 to 190 μg/g filler, respectively, at a hydraulic loading of 0.2 m/d. At a hydraulic loading of 0.4 m/d, the quantities of polysaccharide and protein ranged from 1200 to 3300 μg/g filler and 80 to 290 μg/g filler, respectively. Biofilm intensity and biofilm activity per unit weight decreased with the increase in hydraulic loading.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Microbial communities and relationship with biofilm spatial distributions in subsurface wastewater infiltration systems
Autorzy:: Zhang, L.
Yang, J.
Tematy:: water treatment
wastewater infiltration system
DGGE
volatile suspended solids
oczyszczanie ścieków oczyszczanie wody
systemy infiltracji ścieków
lotne zawiesiny; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/207883.pdf Link otwiera się w nowym oknie
Opis:: A pilot-scale subsurface wastewater infiltration system (SWIS) was designed for the treatment of polluted river water. The components of microbial communities have been identified and characterized and their dependences on some indicators of biofilm formation in the SWIS have been determined. The average efficiencies of COD, TN and removal were 43.3%, 28.8% and 79.6%, respectively. According to the denaturing gradient gel electrophoresis (DGGE) profile, high intensity and uniform bands were generated, indicating an abundant microbial community in each layer of the SWIS. Furthermore, the Shannon index analysis showed high correlation to the spatial distribution of microbial communities as well as the quantity of biofilm in each sample, which were characterized by measuring volatile suspended solids (VSS), phospholipids, proteins and polysaccharides. Sequencing of partial 16S rRNA gene fragments revealed that the composition of the total bacterial communities was dominated by Alphaproteobacteria, Gammaproteobacteria, Deltaproteobacteria, Pseudomonas, Bacillus, Flavobacteriaceae, TM-7, and other uncultured bacteria. These bacteria may contribute to nutrient removal in SWIS. +4 NH –N
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Sharp Upper Bounds on the Clar Number of Fullerene Graphs
Autorzy:: Gao, Yang
Zhang, Heping
Tematy:: fullerene
Clar number
Clar set
leapfrog transformation; Pokaż więcej
Wydawca:: Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Powiązania:: https://bibliotekanauki.pl/articles/31342425.pdf Link otwiera się w nowym oknie
Opis:: The Clar number of a fullerene graph with $n$ vertices is bounded above by $ \floor { n // 6 } − 2 $ and this bound has been improved to $ \floor{ n//6 } − 3 $ when $n$ is congruent to 2 modulo 6. We can construct at least one fullerene graph attaining the upper bounds for every even number of vertices $ n \ge 20 $ except $n = 22 $ and $ n = 30 $.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Sewage sludge as barrier material for heavy metals in waste landfill
Autorzy:: Zhang, H.
Yang, B.
Zhang, G.
Zhang, X.
Tematy:: sewage sludge
hydraulic conductivity
heavy metal pollution
heavy metal retardation; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/204656.pdf Link otwiera się w nowym oknie
Opis:: Heavy metal pollutants in the leachate of waste landfill are a potential threat to the environment. In this study, the feasibility of using municipal sewage sludge as barrier material for the containment of heavy metal pollutants from solid waste landfills was evaluated by compaction test and hydraulic conductivity test concerning compaction property, impermeability and heavy metal retardation. Results of the compaction test showed that the maximum dry density of 0.79 g·cm⁻³ was achieved at the optimum water content of about 60%. The hydraulic conductivities of compacted sewage sludge permeated with synthetic heavy metal solutions were in the range of 1.3×10⁻⁸ – 6.2×10⁻⁹ cm·s⁻¹, less than 1.0 ×10−⁻⁷cm·s⁻¹ recommended by regulations for barrier materials. Chemical analyses on the effluent from the hydraulic conductivity tests indicated that the two target heavy metals, Zn and Cd in the permeants were all retarded by compacted sewage sludge, which might be attributed to the precipitation and adsorption of heavy metal ions. The results of this study suggest that specially prepared material from sewage sludge could be used as a barrier for waste landfills for its low permeability and strong retardation to heavy metal pollutants.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Effects of Reagent Concentration and Particle Size οn Diffusion Rate of Mixed Ores with Rare Elements
Autorzy:: Yang, X.
Zhang, L.
Tematy:: 66.30.Fq
91.65.Rg; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1399505.pdf Link otwiera się w nowym oknie
Opis:: The leaching reaction kinetics of weathered crust elution-deposited rare earth with mixed ammonium salts was studied. The influence of concentration of reagents and particle size of ore on leaching rate was investigated. The results showed that the diffusion process and leaching rate could be improved by increasing reagents concentration and decreasing leaching flowing rate and particle size. The leaching process could be explained with the shrinking core model, which could be controlled by the diffusion rate of reacting reagents in porous solid layer. The leaching rate obeyed the equation as $ 1-2//3η-(1-η)^{2//3}=7.126 \times 10^{-4} C^{0.3038} R^{0.1942}t $.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Study on a concise and unified unstable creep model for rocks
Autorzy:: Cheng, Yang
Zhang, Liangliang
Tematy:: rock mechanics
creep model
antisymmetric
unsteady creep
damage; Pokaż więcej
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/62644984.pdf Link otwiera się w nowym oknie
Opis:: The unsteady creep curve of rocks is antisymmetric to the dynamic surface subsidence curve of coal mining. Accordingly, a four-parameter unsteady creep model of rock was established using an analogous reasoning method from the perspective of phenomenology, and a simple method for determining the model parameters was proposed. The test curves of four different types of rocks were in good agreement with the theoretical curves of the model. In particular, the accelerated creep test curves with nonlinear characteristics were consistent with the theoretical curves of the model, verifying the rationality and accuracy of the model.
Dostawca treści:: Biblioteka Nauki

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