Autor: Zhang, Min - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Effects of combined hypobaric and atmosphere cold storage on the preservation of honey peach
Autorzy:: Wen-xiang, Li.
Zhang, Min
Wydawca:: Polska Akademia Nauk. Instytut Agrofizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/24759.pdf Link otwiera się w nowym oknie
Dostawca treści:: Biblioteka Nauki

Artykuł

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Skocz do pozycji: 2.

Tytuł:: Curve skeleton extraction via k-nearest-neighbors based contraction
Autorzy:: Zhou, Jianling
Liu, Ji
Zhang, Min
Tematy:: curve skeleton
points contraction
point cloud
k nearest neighbors
szkieletyzacja
chmura punktów
metoda k najbliższych sąsiadów; Pokaż więcej
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Powiązania:: https://bibliotekanauki.pl/articles/331332.pdf Link otwiera się w nowym oknie
Opis:: We propose a skeletonization algorithm that is based on an iterative points contraction. We make an observation that the local center that is obtained via optimizing the sum of the distance to k nearest neighbors possesses good properties of robustness to noise and incomplete data. Based on such an observation, we devise a skeletonization algorithm that mainly consists of two stages: points contraction and skeleton nodes connection. Extensive experiments show that our method can work on raw scans of real-world objects and exhibits better robustness than the previous results in terms of extracting topology-preserving curve skeletons.
Dostawca treści:: Biblioteka Nauki

Artykuł

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Skocz do pozycji: 3.

Tytuł:: Efficacy and safety of oral sildenafil in children with Down syndrome and pulmonary hypertension
Autorzy:: Zhang, Min
Rudziński, Andrzej
Beghetti, Maurice
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Artykuł

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Skocz do pozycji: 4.

Tytuł:: Study on microwave-assisted TBM double-edged cutter rock-breaking efficiency and its positional relationship
Autorzy:: Wen, Sen
Du, Lin
Kong, Qingmei
Zhang, Min
Ding, Xinru
Tematy:: microwave-assisted rock-breaking
ouble-edged cutter
discrete element
specific energy
positional relationship; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Powiązania:: https://bibliotekanauki.pl/articles/59112793.pdf Link otwiera się w nowym oknie
Opis:: In this study, based on a microwave test, the discrete element program (PFC) is used to establish a microwave-assisted disc cutter rock-breaking model and explore the influence law of the positional relationship between microwave radiation and disc cutter penetration on rock-breaking efficiency, and the results show that: The improvement of the positional relationship has a significant effect on improving the rock-breaking efficiency, and the double-edged cutter reaches and minimum rock-breaking specific energy when breaking the rock in the center position with a waveguide spacing of 90 mm and in the innerand outerpositions with a waveguide spacing of 150 mm; When the waveguide spacing is 150mm, the double-edged cutter with cutter spacing of 110mm, 130mm, and 190mm have their advantages in rock-breaking efficiency and economic benefits, which should be selected according to the actual needs of the project. The follow-up research should also fully consider the rock type, microwave parameters, cutter profile,engineering environment, and other factors for in-depth investigation.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Work stress and the risk of recurrent coronary heart disease events: A systematic review and meta-analysis
Autorzy:: Li, Jian
Zhang, Min
Loerbroks, Adrian
Angerer, Peter
Siegrist, Johannes
Tematy:: work stress
recurrence
coronary heart disease
meta-analysis
epidemiology
prospective studies; Pokaż więcej
Wydawca:: Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Powiązania:: https://bibliotekanauki.pl/articles/2176999.pdf Link otwiera się w nowym oknie
Opis:: Though much evidence indicates that work stress increases the risk of incident of coronary heart disease (CHD), little is known about the role of work stress in the development of recurrent CHD events. The objective of this study was to review and synthesize the existing epidemiological evidence on whether work stress increases the risk of recurrent CHD events in patients with the first CHD. A systematic literature search in the PubMed database (January 1990 – December 2013) for prospective studies was performed. Inclusion criteria included: peer-reviewed English papers with original data, studies with substantial follow-up (> 3 years), end points defined as cardiac death or nonfatal myocardial infarction, as well as work stress assessed with reliable and valid instruments. Meta-analysis using random-effects modeling was conducted in order to synthesize the observed effects across the studies. Five papers derived from 4 prospective studies conducted in Sweden and Canada were included in this systematic review. The measurement of work stress was based on the Demand- Control model (4 papers) or the Effort-Reward Imbalance model (1 paper). According to the estimation by meta-analysis based on 4 papers, a significant effect of work stress on the risk of recurrent CHD events (hazard ratio: 1.65, 95% confidence interval: 1.23–2.22) was observed. Our findings suggest that, in patients with the first CHD, work stress is associated with an increased relative risk of recurrent CHD events by 65%. Due to the limited literature, more well-designed prospective research is needed to examine this association, in particular, from other than western regions of the world.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 6.

Tytuł:: Anisotropy degree of elastic materials
Autorzy:: Zhang, Jin Min
Rychlewski, J.
Wydawca:: Polish Scientific Publishers IFTR
Powiązania:: Archives of Mechanics
Opis:: Od Vol. 53, issue 4/5 (2001) wyd: PAS. IFTR
The definition of the anisotropy degree of tensors, functions and functionals with respect to some given operation group is presented. The anisotropy degree of four-order tensors is investigated in details. Numerical examples are given for cubic, transversely-isotropic and orthoropic linear elastic materials.
Od Vol. 43, issue 1 (1991) wyd.: Polish Scientific Publishers = PWN
Od Vol. 50, issue 4 (1998) wyd.: Agencja Reklamowo-Wydawnicza A. Grzegorczyk
[1], 617-791 s. ; 24 cm
Dostawca treści:: RCIN - Repozytorium Cyfrowe Instytutów Naukowych

Książka

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Skocz do pozycji: 7.

Tytuł:: The reactive power and voltage control management strategy based on virtual reactance cloud control
Autorzy:: Zhang, Wei Min
Zhang, Yan Xia
Tematy:: cloud model
graph theory
virtual reactance
voltage reactive power management; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/949903.pdf Link otwiera się w nowym oknie
Opis:: The paper aims at the higher reactive power management complexity caused by the access of distributed power, and the problem such as large data exchange capacity, low accuracy of reactive power distribution, a slow convergence rate, and so on, may appear when the controlled objects are large. This paper proposes a reactive power and voltage control management strategy based on virtual reactance cloud control. The coupling between active power and reactive power in the system is effectively eliminated through the virtual reactance. At the same time, huge amounts of data are treated to parallel processing by using the cloud computing model parallel distributed processing, realize the uncertainty transformation between qualitative concept and quantitative value. The power distribution matrix is formed according to graph theory, and the accurate allocation of reactive power is realized by applying the cloud control model. Finally, the validity and rationality of this method are verified by testing a practical node system through simulation.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Simulation of the migration path of the maximum pollutants’ concentration. Case study of the tailing pond, southwest China
Autorzy:: Zhang, Jing
Ma, Yong
Xing, Bing
Zhang, Jian-Min
Ren, Yu-Feng
Liang, Yue
Tematy:: groundwaters
tailing pond
zinc mine
lead mine
ground contaminants
wody gruntowe
staw osadowy
kopalnia cynku
kopalnia ołowiu
zanieczyszczenie gruntu; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/2086910.pdf Link otwiera się w nowym oknie
Opis:: Following China's economic development, lots of tailing deposits have become potential pollution sources, and their leaching would release the trace elements into the natural environment. The leakage rate model and the solute transport models of groundwater are coupled to investigate the effects of the tailing ponds on groundwater. It indicates that the anti-seepage layer is a necessary and important component of the tailing ponds, which could protect the soil or groundwater to be polluted by wastewater. Under three scenarios (scenario A - ideal conditions, scenario B - the worst conditions, and scenario C), the proportions of maximum concentration to source concentration are 1.2, 94.6, and 19.1%, respectively. Under the worst states of anti-seepage layers, the pollution areas after 730, 1800, 3807 and 7300 days were 130 500, 313 200, 523 800, and 729 000 m2, respectively. Compared with Scenario B, the pollution areas of Scenario C after 1800, 3807, and 7300 days were cut by 52.97, 74.55, and 81.73, respectively. Given important anti-seepage layers, the tracking monitor system is necessary and important to discover whether the groundwater was contaminated in time.
Dostawca treści:: Biblioteka Nauki

Artykuł

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Skocz do pozycji: 9.

Tytuł:: An analytical study of pigments in Qing Dynasty murals of Longwang Temple, Xiazhuang, Xinrong district, Datong
Autorzy:: Haijiao, Zhang
Min, Zhang
Tematy:: frescoes
pigments
SEM-energy spectroscopy
Raman spectroscopy; Pokaż więcej
Wydawca:: Łódzkie Towarzystwo Naukowe
Powiązania:: https://bibliotekanauki.pl/articles/55996176.pdf Link otwiera się w nowym oknie
Opis:: The frescoes of Xia Zhuang Longwang Temple in Xinrong District, Datong, were Ming Dynasty frescoes of the Qing Dynasty. To understand their pigment composition, this work used a combination of scanning electron microscopy-energy spectrometry and laser micro Raman spectroscopy to analyze the pigment samples. The results show that the murals of Xia Zhuang Longwang Temple are all inorganic pigments. The white pigment is hard gypsum, the red pigment is mainly cinnabar, the green pigment is alkaline copper chloride, the blue pigment is cobalt blue, the black and gray pigments are mainly carbon black, the pink pigment coloring component is iron red, and the yellow pigment contains coloring components cinnabar and lead. The results of the study are important for understanding the production process of folk murals and the use of pigments in the Qing Dynasty.
Freski dynastii Ming w świątyni Xia Zhuang Longwang w dystrykcie Xinrong w Datong pochodzą z okresu z dynastii Qing. Aby poznać skład ich pigmentów wykorzystano kombinację skaningowej mikroskopii elektronowej, spektrometrii energetycznej i laserowej mikrospektroskopii Ramana do analizy próbek pigmentu. Wyniki pokazują, że wszystkie malowidła ścienne świątyni Xia Zhuang Longwang wykonane zostały za pomocą pigmentów nieorganicznych. Biały pigment to twardy gips, czerwony to głównie cynober, zielony to alkaliczny chlorek miedzi, niebieski to kobaltowy błękit, czarne i szare pigmenty to głównie sadza, komponentem różowego pigmentu jest żelazo, zaś na pigment żółty składa się cynober i ołów. Wyniki badań są ważne dla zrozumienia procesu tworzenia fresków w czasach dynastii Qing.
Dostawca treści:: Biblioteka Nauki

Artykuł

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Skocz do pozycji: 10.

Tytuł:: Research on hydrodynamic properties of annular cavitator with water injection
Autorzy:: Jiang, Zhenyu
Xiang, Min
Lin, Mingdong
Zhang, Weihua
Zhang, Shuai
Tematy:: computation fluid dynamics (CFD)
annular cavitator
water injection; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/259874.pdf Link otwiera się w nowym oknie
Opis:: Annular cavitator with water injection is one of the key parts of the long-range supercavitating vehicle powered by water ramjet. In this paper, hydrodynamic properties of annular cavitator are studied numerically. The standard k ~ ĺ turbulence model is coupled with the Reynolds Averaged Navier-Stokes (RANS) equations to model the natural supercavitation process. The multiphase flow is considered as a mixture of varying density and modeled by the mass exchange equations. To fully understand this process, numerical simulations were performed for different annular cavitators. Computational Fluid Dynamics (CFD) results, including the pressure distribution and forces acting on the cavitator surface, mass flow and pressure loss of water injection, various supercavity sizes, were obtained and analyzed. The pressure distribution on the cavitator surface was significantly changed which resulted in 4 ~ 6% increase of the total drag of the vehicle. The results show that the mass flow and velocity of the injection water is mainly dependent on the tube size, while the total pressure loss of the water injection is mostly related to the outlet pressure. Supercavity generated by annular cavitator is smaller than that of the discal one. Based on the correlation analysis of the supercavity size and other factors, it could be concluded that the contraction of the cavity size is mainly caused by the diffluent mass flow of the water injection.
Dostawca treści:: Biblioteka Nauki

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