Autor: Zhang, H.. - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Effect of electrolyte addition on flotation response of coal
Autorzy:: Zhang, H.
Tematy:: coal flotation
salt solutions
zeta potential
induction time
froth stability; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/109420.pdf Link otwiera się w nowym oknie
Opis:: In this study, the flotation of naturally hydrophobic coal particles in salt solutions with different cations (Na+, Ca2+, and Al3+) was investigated to clarify the flotation enhancement mechanism. The surface chemistry aspects were examined using the zeta potential measurements and bubble-particle attachment time experiments. The results of the flotation experiments showed that the presence of electrolytes in the flotation system clearly enhanced the flotation performance in a manner dependent on the type and concentration of the electrolytes. In the experiments, the AlCl3 and NaCl solutions showed the highest and the lowest flotation performance improvements, respectively. The zeta potential measurements showed that AlCl3 had a stronger influence on the surface charge of coal particles than CaCl2 or NaCl did. The induction time measurements indicated that the attachment decreased with increasing salt concentration and ionic valency state. In addition, abundant fine bubbles were generated in higher concentration salt solutions, particularly for the AlCl3 solutions, which prevented from the bubble coalescence and increased froth stability. It is concluded that the addition of salt solutions to a flotation system enhances the coal flotation performance, particularly for high-valence electrolyte solutions, which is attributed to the abundance of finer bubbles in the froth phase, depending on the type and concentration of the electrolyte.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Incorporation of Experimental Methods into Teaching Real Estate Economics: Process, Practice and Development
Autorzy:: Zhang, H.
Zhang, Y.
Tematy:: experimental teaching
real estate economics
real estate bubble
case; Pokaż więcej
Wydawca:: Wydawnictwo Adam Marszałek
Powiązania:: https://bibliotekanauki.pl/articles/45637729.pdf Link otwiera się w nowym oknie
Opis:: Inspired by the prominent effects that experimental methods have achieved in economics, management, and other fields, this paper tries to introduce the experimental methods into the teaching of real estate economics. For investigating the feasibility and the effectiveness of experimental teaching in a real estate course, we designed and conducted an experiment about the real estate bubble. The effectiveness of the experiment was assessed by questionnaires in four aspects: theoretical understanding, perceptual knowledge, study enthusiasm and practical skills. The results indicate that the experimental methods can be used as an effective teaching method for a real estate economics course.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Fuzzy method and neural network model parallel implementation of multi-layer neural network based on cloud computing for real time data transmission in large offshore platform
Autorzy:: Zhang, H..
Qin, W.
Tematy:: parallel implementation
multi-layer neural network
cloud computing; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/259083.pdf Link otwiera się w nowym oknie
Opis:: With the rapid development of electronic technology, network technology and cloud computing technology, the current data is increasing in the way of mass, has entered the era of big data. Based on cloud computing clusters, this paper proposes a novel method of parallel implementation of multilayered neural networks based on Map-Reduce. Namely in order to meet the requirements of big data processing, this paper presents an efficient mapping scheme for a fully connected multi-layered neural network, which is trained by using error back propagation (BP) algorithm based on Map-Reduce on cloud computing clusters (MRBP). The batch-training (or epoch-training) regimes are used by effective segmentation of samples on the clusters, and are adopted in the separated training method, weight summary to achieve convergence by iterating. For a parallel BP algorithm on the clusters and a serial BP algorithm on uniprocessor, the required time for implementing the algorithms is derived. The performance parameters, such as speed-up, optimal number and minimum of data nodes are evaluated for the parallel BP algorithm on the clusters. Experiment results demonstrate that the proposed parallel BP algorithm in this paper has better speed-up, faster convergence rate, less iterations than that of the existed algorithms.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Experimental study of the aerodynamics of sail in natural wind
Autorzy:: Zeng, X.
Zhang, H..
Tematy:: natural wind
wind sail
aerodynamics
sail assisted ship; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/259718.pdf Link otwiera się w nowym oknie
Opis:: In order to evaluate the impacts of a motor vessel after installing wind sails, the aerodynamics of the sail should be accurately calculated. However most of the research on sails are based on stable wind instead of natural wind which is changing horizontally and vertically. In this paper wind tunnel tests are carried out based on stable wind field and simulated natural wind field, the results shown that there are 16–44% decrease in natural wind in terms of lifting coefficient and 11–42% decrease for drag coefficient. This would provide a valuable reference to the effectiveness evaluation of the impact of sails for sail assisted ships.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Lignite cleaning in NaCl solutions by the reverse flotation technique
Autorzy:: Zhang, H.
Liu, Q.
Tematy:: lignite
reverse flotation
NaCl
kinetics
coal preparation; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/110516.pdf Link otwiera się w nowym oknie
Opis:: A cleaning possibility of low (BD) and high ash content (IM) lignites in NaCl solutions using a reverse flotation technique was studied. Preliminary test results indicated that BD lignite cannot be cleaned effectively in the traditional manner because gangue was floated first rather than a combustible material. Further studies indicated that the lignite cleaning in NaCl solutions using the reverse flotation technique is possible. However, a large quantity of dodecyl amine hydrochloride (DAH) was required. A lower ash content in a concentrate can be obtained by addition of NaCl. A concentrate yield can be im-proved by addition of starch. Under the test conditions, for BD lignite with the ash content in the feed 15.19%, the ash content in the concentrate 11.44% and the concentrate yield 67.38% were obtained. Similarly, for IM lignite with the ash content in the feed 57.40%, the ash content in the concentrate 32.90% and the concentrate yield 25.08% were obtained. The flotation rate constant k and maximum ash recovery ε∞ significantly increased with the NaCl concentration.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Theoretical Studies of the Spin Hamiltonian Parameters and Local Structures for the Two Tetragonal $Cu^{2+}$ Centers in $Ca(OH)_2$
Autorzy:: Zhang, H.
Wu, S.
Zhang, Z.
Tematy:: 76.30.Fc; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1493658.pdf Link otwiera się w nowym oknie
Opis:: The spin Hamiltonian parameters (g factors $g_{∥ },$ $g_{⊥}$ and the hyperfine structure constants $A_{∥ },$ $A_{⊥}$) and the local structures for the two tetragonal $Cu^{2+}$ centers I and II in $Ca(OH)_2$ are theoretically studied from the perturbation formulae of these parameters for a $3d^9$ ion under tetragonally elongated octahedra. The $[Cu(OH)_6]^{4-}$ clusters on the substitutional $Ca^{2+}$ site are found to suffer the relative elongations by about 0.083 Å and 0.065 Å for centers I and II, respectively, along the $C_4$ axis due to the Jahn-Teller effect. The above tetragonal elongations may entirely depress the original trigonal distortion of the host $Ca^{2+}$ site in $Ca(OH)_2$. The calculated spin Hamiltonian parameters based on the above Jahn-Teller elongations show good agreement with the experimental results. The EPR spectra and the local structures for the two centers are compared with one another.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Growth and Characterization of Vanadate Laser Crystals
Autorzy:: Yu, H.
Zhang, H.
Wang, J.
Tematy:: 81.10.Fq
42.55.Px; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1399465.pdf Link otwiera się w nowym oknie
Opis:: Based on the invention and widely application of the Czochralski pulling method, vanadate crystals have been grown and commercialized in recent decades. In this paper, the growth and characterization of a series of neodymium doped vanadate crystals have been reviewed, including $Nd:YVO_4$, $Nd:GdVO_4$, and $Nd:LuVO_4$. The excellent thermal-mechanical and laser property make them to be used in many respects.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Laser frequency stability estimation and velocity measurement in the atmosphere with self-heterodyne
Autorzy:: Zhang, H.
Wang, H.
Zhao, S.
Tematy:: frequency stability
atmospheric propagation
self-heterodyne
Doppler velocity; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/174066.pdf Link otwiera się w nowym oknie
Opis:: We present a novel method of self-heterodyne for laser frequency stability estimation in the atmosphere. At the same time, it is used in the Doppler velocity measurement for moving targets in the atmosphere. The transmission range is 16.2 km (round-trip propagation with 8.1 km) in the horizontal atmospheric path, and the measuring results showed that the frequency stability of the whole laser detection system is 53.4 kHz with 20.7 kHz stand deviation. This frequency stability is the integrated influence with the whole detection system not just for the laser, but it can be considered as the estimation of the laser’s frequency stability. It is much more practical for the heterodyne detection in the atmosphere. At last, the method of self-heterodyne was used for 16.2 km round trip velocity measurement. It is showed that the velocity absolute error is less than 1.5 cm/s in the turbulent atmosphere, and the relative error is not higher than 5%.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Improved Gaussian Mixture Probability Hypothesis Density for Tracking Closely Spaced Targets
Autorzy:: Zhang, H.
Ge, H.
Yang, J.
Tematy:: closely spaced targets
random finite set
probability hypothesis density filter
Gaussian mixture PHD
weight redistribution; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/227341.pdf Link otwiera się w nowym oknie
Opis:: Probability hypothesis density (PHD) filter is a suboptimal Bayesian multi-target filter based on random finite set. The Gaussian mixture PHD filter is an analytic solution to the PHD filter for linear Gaussian multi-target models. However, when targets move near each other, the GM-PHD filter cannot correctly estimate the number of targets and their states. To solve the problem, a novel reweighting scheme for closely spaced targets is proposed under the framework of the GM-PHD filter, which can be able to correctly redistribute the weights of closely spaced targets, and effectively improve the multiple target state estimation precision. Simulation results demonstrate that the proposed algorithm can accurately estimate the number of targets and their states, and effectively improve the performance of multi-target tracking algorithm.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Fibre Number of the Cross-section of Ringspun Yarn and its Strength Prediction Model
Liczba włókien w przekroju poprzecznym przędzy obrączkowej i model dla przewidywania jej wytrzymałości
Autorzy:: Zhang, H. W.
Li, Y. L.
Tematy:: ring-spun yarn
yarn incross section
fibre number
yarn twist
yarn strength predication model
przędza obrączkowa
wytrzymałość przędzy
model wytrzymałości przędzy obrączkowej
masa liniowa; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Powiązania:: https://bibliotekanauki.pl/articles/232277.pdf Link otwiera się w nowym oknie
Opis:: A calculation equation of the fibre number on the cross-section of ring-spun yarn was deduced theoretically and verified with test data of 20 representative pure cotton ring spun yarns. The equation is practical and convenient to use by substituting the yarn count, yarn twist, and fibre decitex. On the basis of the above equation, a yarn strength predication model was established. The revising functions of yarn count and twist to yarn strength were deduced in practical tests of the strength of 20 commonly used ring-spun yarns, and were used to revise the yarn strength predication model obtained. Substituting the fibre decitex, fibre strength, yarn count, yarn twist and yarn strength can be precisely calculated with this model.
Przeprowadzając teoretyczne rozważania autorzy opracowali matematyczny wzór dotyczący liczby włókien w przekroju poprzecznym przędzy obrączkowej. We wzorze tym uwzględnili oddziaływanie: kształtu przekroju poprzecznego włókien i przędzy, masy liniowej włókien i przędzy, gęstości właściwej włókien i przędzy. Zaproponowane równanie pozwala projektować zamienniki przędzy pod względem ich masy liniowej (tex), liczby skrętu i masy liniowej włókien (tex). Traktując rozpatrywane równanie jako punkt wyjścia autorzy opracowali model przewidywania wytrzymałości przędzy. Otrzymane zależności teoretyczne zweryfikowano poprzez badania eksperymentalne. Przebadano 20 powszechnie stosowanych przędz obrączkowych. Opracowane modele pozwalają precyzyjnie obliczyć wytrzymałość przędzy obrączkowej.
Dostawca treści:: Biblioteka Nauki

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