Autor: Zhang, D. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: A Comprehensive Study of the Electrostatic Discharge Sensitivity and Chargeability of Tris(carbohydrazide)zinc Perchlorate
Autorzy:: Li, Z.
Zeng, D.
Zhou, Z.
Zhou, M.
Zhang, T.
Huang, H.
Zhang, J.
Yang, L.
Powiązania:: https://bibliotekanauki.pl/articles/358298.pdf
Data publikacji:: 2014
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:: primary explosive
tris(carbohydrazide)zinc perchlorate
electrostatic discharge sensitivity
chargeability
Opis:: Most primary explosives are non-conductors, easily accumulate charge when contacting with and separating from other materials, and are sensitive to electrostatic discharge (ESD). In order to reduce the number of accidents caused by ESD initiation of primary explosives, studies on their electrostatic hazards are necessary. This work presents comprehensive experimental results of electrostatic discharge sensitivity and chargeability of tris(carbohydrazide)zinc perchlorate (ZnCP) under different conditions. The influences of the testing conditions, of devices, particle size, ambient temperature and relative humidity on the electrostatic discharge sensitivity and chargeability have been investigated in detail, and the quantitative regression equations obtained.
Źródło:: Central European Journal of Energetic Materials; 2014, 11, 4; 553-573
1733-7178
Pojawia się w:: Central European Journal of Energetic Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: A fault diagnosis method for substation grounding grid based on the square-wave frequency domain model
Autorzy:: Zhang, P.-H.
He, J.-J.
Zhang, D.-D.
Wu, L.-M.
Powiązania:: https://bibliotekanauki.pl/articles/221635.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: square-wave
frequency characteristics
grounding grid
fault diagnosis
Opis:: Current methods of fault diagnosis for the grounding grid using DC or AC are limited in accuracy and cannot be used to identify the locations of the faults. In this study, a new method of fault diagnosis for substation grounding grids is proposed using a square-wave. A frequency model of the grounding system is constructed by analyzing the frequency characteristics of the soil and the grounding conductors into which two different frequency square-wave sources are injected. By analyzing and comparing the corresponding information of the surface potentials of the output signals, the faults of the grounding grid can be diagnosed and located. Our method is verified by software simulation, scale model experiments and field experiments.
Źródło:: Metrology and Measurement Systems; 2012, 19, 1; 63-71
0860-8229
Pojawia się w:: Metrology and Measurement Systems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: A large xenusiid lobopod with complex appendages from the Lower Cambrian Chengjiang Lagerstatte
Autorzy:: Liu, J
Shu, D.
Han, J.
Zhang, Z.
Zhang, X.
Powiązania:: https://bibliotekanauki.pl/articles/21541.pdf
Data publikacji:: 2006
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: Chengjiang Lagerstatte
Lobopodia
China
arthropod
Jianshanopodia decora
large lobopod
lobopod
body length
Arthropoda
Xenusiidae
Cambrian
paleontology
Lower Cambrian
Opis:: A large lobopod, Jianshanopodia decora gen. et sp. nov., with body length (excluding appendages) about 220 mm from the Lower Cambrian Haikou section, near Kunming, Yunnan, southwest China, shows a mixture of characters, including features of the lobopod Xenusion Pompeckj, 1927, e.g., a large cylindrical body with annulations, stout and strong lobopod appendages each bearing bases of serial tubercles, and of Aysheaia Walcott, 1911, i.e., a pair of large frontal appendages. This suggests that the new genus might be a connecting link between Xenusion and Aysheaia. Besides, Jianshanopodia shares some features with the Early Cambrian stem group arthropod Pambdelurion Budd, 1997, and Kerygmachela Budd, 1993, e.g., the pairs of mid−gut diverticula, the possible presence of tail fan, the mouth cone, the frontal pharyngeal structures and the pharynax are surrounded by the bases of the large frontal appendages. However, compared with a series of segmentally arranged, imbricating, paddle−shaped, movable lateral flaps of both Pambdelurion and Kerygmachela, Jianshanopodia possesses distinct complex appendages with tree−like or lamellate branches. The discovery of this rare transitional form not only throws new light on the early diversification of lobopods, and may also have significance with respect to the origin of arthropods.
Źródło:: Acta Palaeontologica Polonica; 2006, 51, 2
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: A Lujiatun-like dinosaurian assemblage from the Jehol Biota of Ningcheng, Inner Mongolia, Northeast China
Autorzy:: Zhang, H.
Yu, D.
Feng, Y.
Pei, R.
Zhou, C.-F.
Powiązania:: https://bibliotekanauki.pl/articles/31341389.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: dinosaur
Jehol Biota
Ningcheng county
Yixian Formation
fossil
fauna composition
Early Cretaceous
Cretaceous
Inner Mongolia
China
Źródło:: Acta Palaeontologica Polonica; 2022, 67, 3; 617-621
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: A new Early Cretaceous flea from China
Autorzy:: Zhang, Y.
Shih, C.
Rasnitsyn, A.P.
Ren, D.
Gao, T.
Powiązania:: https://bibliotekanauki.pl/articles/2082117.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: Insecta
Siphonaptera
Saurophthiridae
Saurophthirus
ectoparasitic insects
compression fossils
Mesozoic
Asia
Opis:: Fleas are highly specialized holometabolic insects. So far, only 16 species of fossil fleas in five families have been reported due to the rare fossil records. At present, the earliest flea fossils are reported from the Middle Jurassic Jiulongshan Formation of Northeastern China. The descriptions of these earliest species pushed back the origin of Siphonaptera by at least 40 million years. It is generally accepted that saurophthirids are the “transitional” taxa from stem Jurassic fleas to living crown groups. Herein, we described a new “transitional” flea species, Saurophthirus laevigatus Zhang, Shih, Rasnitsyn, and Gao sp. nov., from the Lower Cretaceous Yixian Formation of Northeastern China, assigned to Saurophthiridae. The new species provides new evidence to support saurophthirids as a “transitional” group. Sexual dimorphism suggests significant differences in biology of opposite sexes in Saurophthirus. Analysis of described Mesozoic species demonstrates the body size reduction from the Middle Jurassic to the Early Cretaceous. Smaller body size was likely advantageous in reducing the probability of being detected and removed by the host and in minimizing flea’s demand for blood intake and energy input, indicating the adaptation of the ectoparasitic lifestyle of fleas in their early stage of evolution.
Źródło:: Acta Palaeontologica Polonica; 2020, 65, 1; 99-107
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: A New Potential Superhard Phase of $OsN_2$
Autorzy:: Fan, Q.
Wei, Q.
Yan, H.
Zhang, M.
Zhang, D.
Zhang, J.
Powiązania:: https://bibliotekanauki.pl/articles/1205218.pdf
Data publikacji:: 2014-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 62.20.de
65.40.-b
62.20.dq
Opis:: A new phase of C2/m $OsN_2$ is proposed in this paper. The crystal structure, elasticity and electronic properties of C2/m $OsN_2$ were studied by first-principles calculations. The elastic constants, the elastic moduli (B, G, and E) and Poisson's ratio v of $OsN_2$ have been investigated. From the first-principles calculations, we find that C2/m $OsN_2$ is metallic and mechanically stable. The quasi-harmonic Debye model, using a set of total energy versus molar volume obtained from the first-principles calculations, is applied to the study of the thermal and vibrational effects. The dependence of structural parameters, thermal expansions, heat capacities, Grüneisen parameters and Debye temperatures on the temperature and pressure are obtained in the whole pressure range from 0 to 80 GPa and temperature range from 0 to 800 K as well as compared with available data.
Źródło:: Acta Physica Polonica A; 2014, 126, 3; 740-746
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: A novel method for 3D measurement of RFID multi-tag network using a machine vision system
Autorzy:: Zhuang, X.
Yu, X.
Zhao, Z.
Zhang, W.
Liu, Z.
Lu, D.
Dong, D.
Powiązania:: https://bibliotekanauki.pl/articles/221058.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: 3D measurement
RFID multi-tag network
dual-CCD system
neural network
machine vision
Opis:: The three-dimensional (3D) coordinate measurement of radio frequency identification (RFID) multi-tag networks is one of the important issues in the field of RFID, which affects the reading performance of RFID multi-tag networks. In this paper, a novel method for 3D coordinate measurement of RFID multi-tag networks is proposed. A dual-CCD system (vertical and horizontal cameras) is used to obtain images of RFID multi-tag networks from different angles. The iterative threshold segmentation and the morphological filtering method are used to process the images. The template matching method is respectively used to determine the two-dimensional (2D) coordinate and the vertical coordinate of each tag. After that, the 3D coordinate of each tag is obtained. Finally, a back-propagation (BP) neural network is used to model the nonlinear relationship between the RFID multi-tag network and the corresponding reading distance. The BP neural network can predict the reading distances of unknown tag groups and find out the optimal distribution structure of the tag groups corresponding to the maximum reading distance. In the future work, the corresponding in-depth research on the neural network to adjust the distribution of tags will be done.
Źródło:: Metrology and Measurement Systems; 2018, 25, 3; 475-486
0860-8229
Pojawia się w:: Metrology and Measurement Systems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: A novel Δ12-fatty acid desaturase gene from methylotrophic yeast Pichia pastoris GS115
Autorzy:: Wei, D
Li, M
Zhang, X
Zhou, H
Xing, L
Powiązania:: https://bibliotekanauki.pl/articles/1041169.pdf
Data publikacji:: 2006
Wydawca:: Polskie Towarzystwo Biochemiczne
Tematy:: fatty acid desaturase gene
Pichia pastoris
Saccharomyces cerevisiae
linoleic acid
Opis:: The methylotrophic yeast Pichia pastoris GS115, a widely used strain in production of various heterologous proteins, especially membrane-bound enzymes, can also produce linoleic and linolenic acids, which indicates the existence of membrane-bound Δ12 and Δ15-fatty acid desaturases. This paper describes the cloning and functional characterization of a novel Δ12-fatty acid desaturase gene from this methylotrophic yeast. The open reading frame of the gene (named Pp-FAD12) is 1263 bp in size and encodes a 420-amino-acid peptide. The deduced Pp-FAD12 protein shows high identity (50-67%) with Δ12-fatty acid desaturases from other fungi. It also shows a high identity (57%) with Δ15-fatty acid desaturase (named Sk-FAD15) from Saccharomyces kluyveri. Expression of Pp-FAD12 in polyunsaturated fatty acids non-producing yeast Saccharomyces cerevisiae demonstrated that its product converted oleic acid (18 : 1) to linoleic acid (18 : 2). This result suggests that Pp-FAD12 encodes a novel Δ12-fatty acid desaturase in P. pastoris GS115. This is the first report about the cloning and functional characterization of Δ12-fatty acid desaturase gene in methylotrophic yeast.
Źródło:: Acta Biochimica Polonica; 2006, 53, 4; 753-759
0001-527X
Pojawia się w:: Acta Biochimica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: A numerical approach in applying panel method for the added mass of a group of sections in fluids
Autorzy:: Zhang, D.
Li, P.
Wang, Q.
Yang, Y.
Powiązania:: https://bibliotekanauki.pl/articles/38695713.pdf
Data publikacji:: 2023
Wydawca:: Instytut Podstawowych Problemów Techniki PAN
Tematy:: numerical method
panel method
fluid-structure interaction
confined fluid
fluid mass coefficients
Opis:: This paper firstly expands an efficient numerical methodology developed from the source panel method to the added mass calculation of long column systems in fluid. Structures submerged in fluid are considered as two-dimensional and are discretized into a number of source panels. The influence coefficient matrices and the potential function are then calculated and the fluid forces are calculated by the unsteady Bernoulli equation. Finally, we utilize this present method to calculate the mass coefficients of some typical problems, which effectively verifies its feasibility and accuracy. This method takes into account both applicability and computational efficiency. On the one hand, in contrast to the analytical method which is only applicable to specific cross-sections, this method is applicable to arbitrary boundaries with C⁰ continuity in mathematics. On the other hand, this method requires less mesh and computation than commercial software. This paper extends the application of the source panel method which is widely used in aerodynamics to provide a reference for added mass calculation problems in engineering.
Źródło:: Archives of Mechanics; 2023, 75, 1-2; 151-168
0373-2029
Pojawia się w:: Archives of Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: A prediction method for load distribution in threaded connections
Autorzy:: Zhang, D.
Gao, S.
Niu, S.
Liu, H.
Powiązania:: https://bibliotekanauki.pl/articles/949123.pdf
Data publikacji:: 2018
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: load distribution
threaded connections
finite element analysis
Opis:: A new method has been developed for predicting the load distribution along the thread portion of a bolt and nut connection. The calculated results were validated by comparison with three-dimensional finite element analysis and Yamamoto’s method. It was shown that the load distribution predicted by the model in this paper was in good agreement with the results from finite element model, and the load ratio on the first thread by the prediction model and finite element model was slightly larger than the results from Yamamoto’s method. In addition, the results of calculation and finite element analysis indicated that the decreasing of the lead angle could improve the load distribution, the increasing of the length of thread engaged could significantly improve the load bearing capacity of the first thread, and the adopting of a material with low stiffness for the nut with respect to the bolt could improve the load distribution slightly.
Źródło:: Journal of Theoretical and Applied Mechanics; 2018, 56, 1; 157-168
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Actuator fault tolerant control design based on a reconfigurable reference input
Autorzy:: Theilliol, D.
Join, C.
Zhang, Y.
Powiązania:: https://bibliotekanauki.pl/articles/929874.pdf
Data publikacji:: 2008
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: sterowanie odporne na błędy
akomodacja uszkodzeń
urządzenie wykonawcze
rekonfigurowalne wejście odniesienia
fault tolerant control (FTC)
actuator fault accommodation
reconfigurable reference input
Opis:: The prospective work reported in this paper explores a new approach to enhance the performance of an active fault tolerant control system. The proposed technique is based on a modified recovery/trajectory control system in which a reconfigurable reference input is considered when performance degradation occurs in the system due to faults in actuator dynamics. An added value of this work is to reduce the energy spent to achieve the desired closed-loop performance. This work is justified by the need of maintaining a reliable system in a dynamical way in order to achieve a mission by an autonomous system, e.g., a launcher, a satellite, a submarine, etc. The effectiveness is illustrated using a three-tank system for slowly varying reference inputs corrupted by actuators faults.
Źródło:: International Journal of Applied Mathematics and Computer Science; 2008, 18, 4; 553-560
1641-876X
2083-8492
Pojawia się w:: International Journal of Applied Mathematics and Computer Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: An improved resonant thermal converter based on micro-bridge resonator
Autorzy:: Dong, L.
Han, J.
Zhang, P.
Zhao, Z.
Cheng, B.
Han, D.
Powiązania:: https://bibliotekanauki.pl/articles/220878.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: thermoelectric transfer difference
micro-bridge resonator
thermal converter
bifilar heater
Opis:: This paper presents the design, fabrication and testing of an improved thin-film thermal converter based on an electro-thermally excited and piezo-resistively detected micro-bridge resonator. The resonant thermal converter comprises a bifilar heater and an opposing micro-bridge resonator. When the micro-bridge resonator absorbs the radiant heat from the heater, its axial strain changes, then its resonant frequency follows. Therefore the alternating voltage or current can be transferred to the equivalent DC quantity. A non-contact temperature sensing mechanism eliminates heat loss from thermopiles and reduces coupling capacitance between the temperature sensor and the heater compared with traditional thin-film thermal converters based on thermopiles. In addition, the quasi-digital output of the resonant thin-film thermal converter eliminates such problems as intensity fluctuations associated with analogue signals output by traditional thin-film thermal converters. Using the fast-reversed DC (FRDC) method, the thermoelectric transfer difference, which determines the frequency-independent part of the ac-dc transfer difference, is evaluated to be as low as 1.1 · 10^-6. It indicates that the non-contact temperature sensing mechanism is a feasible method to develop a high-performance thermal converter.
Źródło:: Metrology and Measurement Systems; 2018, 25, 4; 715-725
0860-8229
Pojawia się w:: Metrology and Measurement Systems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: An improved space vector modulation strategy for common-mode voltage reduction in matrix rectifier
Autorzy:: Liu, X.
Zhang, Q.
Hou, D.
Powiązania:: https://bibliotekanauki.pl/articles/950664.pdf
Data publikacji:: 2014
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: matrix converter
space vector modulation
common-mode voltage
Opis:: The matrix rectifier modulated by the classical space vector modulation (SVM) strategy generates common-mode voltage (CMV). The high magnitude and high du/dt of the CMV causes serious problems such as motor damage, electromagnetic noise and many others. In this paper, an improved SVM strategy is proposed by replacing the zero vectors with suitable couple of active ones that substantially eliminate the CMV. Theoretical analysis proves that the proposed strategy can reduce the amplitude of the CMV to half of the original value. In addition, the quality of the input and output waveforms is not affected by extra active vectors. Simulation and experimental results demonstrate the feasibility and effectiveness of the proposed strategy are shown.
Źródło:: Archives of Electrical Engineering; 2014, 63, 1; 93-106
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Application the optimization models to analysis of the industrial pollutant emission in China
Autorzy:: Zhang, Z.
Liu, G.-D.
Guo, H.
Liu, L.
Deng, S.-H.
Powiązania:: https://bibliotekanauki.pl/articles/950041.pdf
Data publikacji:: 2013
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: industrial emissions
air pollution
mathematical models
sulfur dioxide
air pollutant emission
environmental indicators
industrial pollutants
smoke emission
emisja przemysłowa
zanieczyszczenie powietrza
model matematyczny
dwutlenek siarki
ditlenek siarki
emisja zanieczyszczeń powietrza
wskaźniki środowiskowe
zanieczyszczenia przemysłowe
emisja dymu
Opis:: An industrial planning is made based on the optimization model. Factor analysis was used to reject relativity among the environmental indicators. Then, thirty nine industries were clustered into four clusters. Lastly, optimization model was used to plan the industrial structure. Adjusting the industrial structure, it is difficult to reduce vast SO2, smoke, and dust with total industrial output value growth; the air pollutant emission only can be decreased by 10%. The parameters of smoke emission are limited constrains for the optimization. The reasonable and feasible way to solve the problem is to introduce the lower smoke emission technique of the cluster 2 and 4 industries.
Źródło:: Environment Protection Engineering; 2013, 39, 1; 87-99
0324-8828
Pojawia się w:: Environment Protection Engineering
Dostawca treści:: Biblioteka Nauki