Wyniki wyszukiwania - Biblioteka Nauki

1

Effects of mobile phone radiation on germination and early growth of different bean species

100%

Chen H.-Y. , Chen C.

|

nr 6

EN

Five species of beans were chosen to observe the effects of intermittent periods and doses of cell phone electromagnetic field radiation (EMR) on germination seeds. Beans were grown under the same environment and the EMR was different. The treatment included two intermittent periods (4 and 24 h) and three radiation intensities (high, low, and check). The frequency of EMR was 1805-1850 MHz. The mean power density was 0.4809 mW/cm2 for high treatment and 1.455 mW/cm2 for low treatment. The specific absorption rating (SAR) values were measured and expressed as units of W/kg for the five beans. The effects of EMR on the germination rates of seeds were inconsistent. Germination differed under EMR treatment for red bean, soybean, and Mologa bean but not mung and Hyacinth bean. The 24 h intermittent exposure had a significant effect on the height and fresh weight of mung beans. Results differed under high, low, and with check. The 4 h intermittent exposure did not significantly affect the height or fresh weight. Hyacinth and mologa beans showed similar results. Only 24 h intermittent exposure with high treatment had a significant effect on height and fresh weight. Under the same EMR and exposure times the received dose was the same. However, bean species had different germination.

2

Synthesis of PVDF/SBT composite thin films by spin coating technology and their ferroelectric properties

80%

Chen C. , Hu P. , Yang J. , Liu Z.

Materials Science Poland

|

2016

|

tom Vol. 34, No. 3

650--654

EN

Ferroelectric composite thin films of x-SBT/PVDF with different SBT content (weight ratios of SBT to PVDF, x = 0 %, 5 %, 10 %, 15 %, 20 %) were prepared by spin-coating method. The crystal structures of x-SBT/PVDF films were analyzed by X-ray diffraction (XRD) measurements and Fourier transform-infrared spectroscopy (FT-IR), respectively. Experimental results demonstrated that both α, β-phases PVDF and the layered perovskite SBT co-existed in the x-SBT/PVDF samples. With an increase of SBT content in the x-SBT/PVDF thin films, both the dielectric constant and the saturated polarization were also increased, compared with those of pure PVDF thin film. More importantly, when the SBT content in the x-SBT/PVDF thin films was larger than 15 %, the coercive field of x-SBT/PVDF thin films was also decreased.

3

Stability of nominally stable uncertain singularly perturbed systems with multiple time delays

80%

Chen C. , Pan S. , Hsieh J.

Control and Cybernetics

|

2002

|

tom Vol. 31, no 1

5-16

EN

In this paper, the robust asymptotic stability problem for a class of nominally stable uncertain singularly perturbed systems with multiple non-commensurate time delays is considered. A delay-dependent criterion is first proposed in this paper to guarantee robust asymptotic stability of the system under consideration. Based on this result, the range of allowable bounds of the perturbation matrices preserving the closed-loop stability can easily be found. Moreower, a simple criterion is also proposed to guarantee asymptotic, stability of the nominal system. Furthermore, a simple estimation of the stability bound epsilon* is proposed such that the nominal system is asymptotically stable for epsilon [belongs to](0,epsilon*). It can be seen that the stability bound proposed in this paper is less conservative than that presented in recent research. Finally, a numerical example is provided to illustrate our main results.

4

Tissue contents and intracellular distribution of selenium and iodine in human tissues studied by neutron activation analysis

80%

Chen C. , Zhao J. , Gao Y. , Chai Z.

Chemia Analityczna

|

2005

|

tom Vol. 50, No. 1

169-178

EN

Selenium and iodine are two essential elements in living systems. In this paper, the tissue contents and subcellular distributions of selenium and iodine in human liver, - kidney and heart samples were studied by neutron activation analysis (NAA). Certified reference materials were used as analytical quality control. Selenium was highly enriched in human kidney, followed by liver and then heart. In contrast, iodine was only enriched in liver. Different subceHular distribution patterns were also found in different tissues. In addition, selenium was mainly enriched in mitochondria and nuclei, whereas the lowest concentration of iodine was in the soluble fractions of cells. About 45-70% of total Se and 1 were in the nuclear fractions. The present data can reflect the long-term accumulation of selenium and iodine inhuman body. Our study also provides the reference data of selenium and Iodine in human important tissues and the corresponding subcellular fractions.

PL

Metoda,neutronowej analizy aktywacyjnej oznaczano zawartość i rozkład wewnątrzkomórkowy selenu i jodu w próbkach ludzkiej wątroby, nerek i serca. Wyniki skontrolowano stosując certyfikowane materiały referencyjne. Istotne wzbogacenie w selen stwierdzono \v nerkach, a następnie w wątrobie i sercu. Zwiększenie steżeniajodu stwierdzono jedynie w wątrobie. Stwierdzono również różnice w rozkładzie pierwiastków na poziomie wewnątrzkomórkowym w różnych tkankach. Selen ulegał wzbogaceniu głównie w mitochondriach i jądrach komórkowych, podczas gdy najniższe stężenie jodu stwierdzono w rozpuszczalnych frakcjach komórek. Około 45-70% całkowitej zawartości selenu i jodu stwierdzono w jądrach komórkowych. Dane te odzwierciedlają długotrwałą akumulacje selenu i jodu w ludzkim ciele. Nasze badania dostarczają porównawczych danych odnośnie zawartości pierwiastków w ważnych tkankach ludzkich oraz we frakcjach wewnątrzkomórkowych.

5

Investigations of topographic effect on radial current in South Yellow Sea

80%

Chen C. , Wang Y. , Huang H.

Polish Maritime Research

|

2017

|

tom 24

|

nr Special Issue S3

EN

Large scaled projects are conducted in South Yellow Sea in recent years. Topographic effect and tidal current are key issues to the coastal engineering and the ocean engineering. In this study, field surveys were conducted to investigate the tidal level, current velocity, and current direction in South Yellow Sea. A numerical model was developed to simulate the radial current field based on the field data. To investigate the mechanism of the radial current field, the actual topography and a smoothed topography were applied in the numerical model, respectively. Results show that, the current field appeares radial because of the tidal system rather than the submarine topography. Local topography centralized the radiation centre and shifted the high-velocity zones. The actual topographic effect is proposed, and results show that local topography increases the flood tide velocity and decreases the ebb tide velocity. Lagrangian residual currents are calculated to illustrate possible sediment sources and transport routes

6

Towards the building information modeling-based capital project lifecycle management in the luxury yacht industry

80%

Liu F. , Chen C. , Wu W.

|

2017

|

tom S 3

41--48

EN

It will be a new approach that BIM’s capital project lifecycle management (CPLM) applied to the yacht industry. This paper explored the feasibility of applying the principles and rationales of BIM for capital project lifecycle management in luxury yacht design, engineering, fabrication, construction and operation. The paper examined the premises and backbone technology of BIM. It then evaluated leading naval engineering and shipbuilding software applications and their development trends from the functional lens of BIM. To systematically investigate a BIM-based approach for capital project lifecycle management (CPLM) in the luxury yacht industry, the paper proposed and outlined an implementation framework. A case study and a student competition use case were discussed to delineate the core constituents and processes of the proposed framework. The case of BIM was reviewed. Through the domestic custom luxury yacht design and prototyping student competition, the application of this framework in educational research is demonstrated and the initial quantitative assessment of the framework is carried out. Conclusions: a BIM-based CPLM implementation framework can help the luxury yacht industry capitalize on the global transformation to an information-centric and data-driven new business paradigm in shipbuilding with integrated design, manufacturing and production.

7

Hindlimb suspension - induced cell apoptosis in the posterior parietal cortex and lateral geniculate nucleus: corresponding changes in c - Fos protein and the PI3K/Akt signaling pathway

80%

Huang W. , Chen C. , Liu X.

Acta Neurobiologiae Experimentalis

|

2018

|

tom 78

|

nr 3

EN

Recent physiological studies indicate that weightlessness reliably alters ocular structure and function, as well as the ability to process visual‑spatial information. The posterior parietal cortex (PPC) and lateral geniculate nucleus (LGN) are two key brain areas implicated in the processing of visual‑spatial information. Here, we used the modified tail‑suspension rat model to simulate the physiological effects of microgravity. Rats were divided into four groups, which exposed to the simulated microgravity environment for 0 (Control group), 7, 14, or 28 days. We found a significant increase in cellular apoptosis in the PPC and the LGN after 7 days of simulated microgravity. In addition, there was an increase in expression of c‑Fos protein in the PPC, and a repression of the PI3K/Akt signaling pathway in the LGN after 7 days. Based on these results, we conclude that short‑term simulated microgravity may induce cell apoptosis in the PPC and LGN, and reflect a neural adaptive process to accommodate a microgravity environment

8

D-stability for a class of discrete descriptor systems with multiple time delays

80%

Pan S. , Chen C. , Hsieh J.

Control and Cybernetics

|

2002

|

tom Vol. 31, no 1

79-89

EN

In this paper, the research on discrete descriptor systems is extended to include discrete multiple time-delay descriptor systems. The impulse-free and D-stability problem for a class of discrete descriptor systems with multiple time delays is investigated. A delay-dependent criterion is first derived to guarantee that the system is proper. A delay-dependent stability criterion in terms of spectral radius is then presented to ensure the D-stability of the system. Furthermore, a delay-dependent criterion is proposed to guarantee that the system is nebular, impulse-free, and D-stable. Finally, a numerical example is provided to illustrate our main results.

9

Investigations of Topographic effect on radial current in South Yellow Sea

80%

Chen C. , Wang Y. , Huang H.

|

2017

|

tom S 3

123--129

EN

Large scaled projects are conducted in South Yellow Sea in recent years. Topographic effect and tidal current are key issues to the coastal engineering and the ocean engineering. In this study, field surveys were conducted to investigate the tidal level, current velocity, and current direction in South Yellow Sea. A numerical model was developed to simulate the radial current field based on the field data. To investigate the mechanism of the radial current field, the actual topography and a smoothed topography were applied in the numerical model, respectively. Results show that, the current field appeares radial because of the tidal system rather than the submarine topography. Local topography centralized the radiation centre and shifted the high-velocity zones. The actual topographic effect is proposed, and results show that local topography increases the flood tide velocity and decreases the ebb tide velocity. Lagrangian residual currents are calculated to illustrate possible sediment sources and transport routes.

10

Towards the building information modeling-based capital project lifecycle management in the luxury yacht industry

80%

Liu F. , Chen C. , Wu W.

Polish Maritime Research

|

2017

|

tom 24

|

nr Special Issue S3

EN

It will be a new approach that BIM’s capital project lifecycle management (CPLM) applied to the yacht industry. This paper explored the feasibility of applying the principles and rationales of BIM for capital project lifecycle management in luxury yacht design, engineering, fabrication, construction and operation. The paper examined the premises and backbone technology of BIM. It then evaluated leading naval engineering and shipbuilding software applications and their development trends from the functional lens of BIM. To systematically investigate a BIM-based approach for capital project lifecycle management (CPLM) in the luxury yacht industry, the paper proposed and outlined an implementation framework. A case study and a student competition use case were discussed to delineate the core constituents and processes of the proposed framework. The case of BIM was reviewed. Through the domestic custom luxury yacht design and prototyping student competition, the application of this framework in educational research is demonstrated and the initial quantitative assessment of the framework is carried out. Conclusions: a BIM-based CPLM implementation framework can help the luxury yacht industry capitalize on the global transformation to an information-centric and data-driven new business paradigm in shipbuilding with integrated design, manufacturing and production

11

Abnormal phase removing method in phase measuring profilometry

71%

Xu X. , Cao Y. , Chen C. , Cao S. , Peng K.

Optica Applicata

|

2017

|

tom Vol. 47, nr 1

85--95

EN

An abnormal phase removing method in phase measuring profilometry is proposed. In the five equal shifting phase steps algorithm, the shifting phase might be extracted from the deformed patterns captured by CCD camera. But there may be some errors introduced by a digital fringe projector and CCD camera in these deformed patterns. The impurity of the deformed patterns may lead to four classes of abnormalities when extracting the shifting phase. These abnormalities may cause the wrong shifting phase extraction by which the reconstructed object might be misshapen or anamorphic, or even in failure. By this proposed method, the above abnormalities can be removed, and the shifting phase can be auto-extracted precisely from the impure deformed patterns without knowing its value. Experimental results verify the feasibility and effectiveness of the proposed method.

12

Traffic fatalities prediction based on support vector machine

71%

Li T. , Yang Y. , Wang Y. , Chen C. , Yao J.

Archives of Transport

|

2016

|

tom Vol. 39, iss. 3

21--30

EN

To effectively predict traffic fatalities and promote the friendly development of transportation, a prediction model of traffic fatalities is established based on support vector machine (SVM). As the prediction accuracy of SVM largely depends on the selection of parameters, Particle Swarm Optimization (PSO) is introduced to find the optimal parameters. In this paper, small sample and nonlinear data are used to predict fatalities of traffic accident. Traffic accident statistics data of China from 1981 to 2012 are chosen as experimental data. The input variables for predicting accident are highway mileage, vehicle number and population size while the output variables are traffic fatality. To verify the validity of the proposed prediction method, the back-propagation neural network (BPNN) prediction model and SVM prediction model are also used to predict the traffic fatalities. The results show that compared with BPNN prediction model and SVM model, the prediction model of traffic fatalities based on PSO-SVM has higher prediction precision and smaller errors. The model can be more effective to forecast the traffic fatalities. And the method using particle swarm optimization algorithm for parameter optimization of SVM is feasible and effective. In addition, this method avoids overcomes the problem of “over learning” in neural network training progress.

13

Modeling and controller synthesis of a hybrid-LCL APF for power quality conditioning applications

61%

Han Y. , Xu L. , Mansoor Khan M. , Chen C. , Yao G. , Zhou L.

Przegląd Elektrotechniczny

|

2010

|

tom R. 86, nr 9

326-333

EN

This paper proposes an LCL-filter-based hybrid active power filter for harmonic mitigation and reactive power of a 10/0.4kV residential distribution system. Adaptive linear neural network (ADALINE) is applied for individual harmonic component extraction from distorted nonlinear load currents, and the estimated signals are used for the selective harmonic elimination (SHE) purpose in the current-loop controller. A robust deadbeat current control law is derived based on the low frequency model of the presented topology. By using the ADALINE based SHE strategy, the currentloop controller bandwidth is significantly reduced thus the stability of whole system is ensured. The proposed control algorithms were digitally implemented in TMS320F2812 DSP controllers, where the dual DSP plus FPGA hardware configuration was adopted for precise signal conditioning and calculation. Both the laboratory experiments and field tests are implemented. The feasibility and effectiveness of the proposed system have been substantially confirmed by the laboratory experiments and field tests, which were obtained from the practical installation of the prototype systems in a residential distribution system as well as in the distribution system in the punching shop of an auto manufactory factory.

PL

W artykule zaproponowano aktywny filtr LCL do tłumienia harmonicznych i mocy biernej w 10/0.4 kV lokalnej sieci rozdzielczej. Wykorzystano adaptacyjną sieć neuronową do ekstrakcji harmonicznych z prądów odkształconych a wyznaczony sygnał zastosowano do selektywnej eliminacji harmonicznych. Odporny układ kontroli prądu bazuje na niskoczęstotliwościowym modelu sieci. Dzięki proponowanej strategii pasmo kontrolera jest zredukowane a stabilnosć poprawiona. Proponowany algorytm implementowano wykorzystując procesor typu TMS 320F2812 w którym adaptowano podwójny DSP i FPGA układ do precyzyjnego kondycjonowania sygnału i obliczeń. Testy laboratoryjne potwierdziły skuteczność algorytmu. System sprawdzono w lokalnej sieci rozdzielczej w fabryce samochodów.

14

A Robust Deadbeat Control Scheme for Active Power Filter with LCL Input Filter

61%

Han Y. , Xu L. , Yao G. , Zhou L. , Khan M. , Chen C.

Przegląd Elektrotechniczny

|

2010

|

tom R. 86, nr 2

14-19

EN

This paper proposes a novel robust deadbeat control scheme for the active power filter with LCL input filter. The selection of the current loop gain is discussed by using root locus diagram representation to ensure stability of the closed-loop control algorithm. A feed-forward plus feedback control structure is adopted to achieve accurate steady-state performance and fast dynamic response by using the adaptive linear neural network (ANN) harmonic detection scheme. The validity of the control scheme is verified by the extensive simulation and experimental results.

PL

Artykuł przedstawia nowy odporny system sterowania dla aktywnych filtrów energetycznych z wejściowym filtrem LCL. Dobór wzmocnienia pętli prądowej jest analizowany dla zapewnienia stabilności sterowania przy zamkniętej pętli. Zaadaptowano sprzężenie do przodu i sprzężenie zwrotne dla dokładnego osiągnięcia stanu ustalonego i szybkiej odpowiedzi dynamicznej przy wykorzystaniu adaptacyjnej liniowej sieci neuronowej. Jakość sterowania potwierdzono badaniami symulacyjnymi i eksperymentalnymi.

15

Significant effect of oxygen atmosphere on the structure, optical and electrical properties of Ti-doped In2O3 transparent conductive thin films

61%

Dong C. J. , Yu W. X. , Xu M. , Chen C. , Song Z. Y. , Li L. , Wang Y. D.

Optica Applicata

|

2011

|

tom Vol. 41, nr 3

765--775

EN

Titanium-doped indium oxide (In2O3) transparent conductive thin films were deposited on glass and sapphire (0001) substrates with/without oxygen atmosphere by DC magnetron sputtering at 300 °C. The content of titanium is estimated to be about 1.8 at.% using energy dispersive spectroscopy. The smooth surfaces were covered with more uniform octahedral grains. X-ray diffraction measurements indicated that the preferential growth orientation along the (400) plane for the sample grown without oxygen atmosphere shifts to (222) for the sample grown in the oxygen atmosphere. The average optical transmittance of the sample grown with the introduction of oxygen varies from 70% to 90% in the visible region, which corresponds well to the variation of carrier and mobility. Hence, both intermediate dopant and oxygen atmosphere will provide the optimum balance between carrier concentration and mobility leading to the best transport properties of Ti-doped In2O3 films.

16

A method for measuring the quality parameters of image intensifier based on projecting phase-shifting gratings

61%

Sun S. , Cao Y. , Chen C. , Fu G. , Wang Y. , Xu X.

|

tom Vol. 48, nr 1

39--51

EN

A method for measuring the quality parameters of image intensifier based on projecting phase-shifting gratings is proposed. A set of designed phase-shifting gratings are projected into the measuring system orderly to obtain the magnification parameter of the measured image intensifier, and the phase caused by the measured image intensifier. After obtaining the referential phase caused by only the magnification of the measured image intensifier, the phase caused by the distortion of the measured image intensifier is extracted by phase calculating and phase unwrapping. Both the global distortion and the partial distortion of the measured image intensifier can be measured by phase-to-distortion matching at the same time. The experimental results show that the proposed method can measure the multiple quality parameters of image intensifier effectively.

17

Sequence variations and expression analysis of FAD2 gene among safflower materials with different linoleic acid content in seed oil

61%

Li D. , Yu J. , Wang Q. , Hu B. , Chen C. , Hou K. , Wu W.

Acta Physiologiae Plantarum

|

2019

|

tom 41

|

nr 08

EN

Safflower varieties were commonly divided into high, low and middle linoleic acid (LA) types according to their LA relative percentage contents in the seed oil. Fatty acid desaturase 2 (FAD2) plays a key role for LA content in seed. The sequence variations of FAD2 (CtFAD2-2, CtFAD2-10, CtFAD2-11) genes which could express in developmental seed of safflower were analyzed in 15 different LA-type materials. The results revealed that the CtFAD2-2 sequences were the same in all materials, and the CtFAD2-10, CtFAD2-11 sequences formed into two haplotypes independent of the LA-type of safflower seed. Yeast expression analysis revealed that two haplotypes of CtFAD2-10 had the function of oleic acid desaturase. The real-time PCR analysis of FAD2 in high and low LA-type materials at different seed developmental stages revealed that CtFAD2-2, CtFAD2-10 and CtFAD2-11 expressed mainly at 10 days after flower (DAF) for two different LA-type materials and the accumulation of few mRNA was detected in 14–22 DAF. The expression pattern of CtFAD2-1 in two different LA-type safflower materials was significantly divergent. For high-LA type, the accumulation of CtFAD2-1 mRNA was extremely low in 10 DAF, and its expression level increased sharply between 14 and 18 DAF and decreased slightly after 18 DAF. For low-LA type, the accumulation of CtFAD2-1 mRNA was extremely low during seed development stages. In conclusion, the gene structure and expression level of CtFAD2-1 may be the main factor affecting the differentiation of LA-type for safflower materials.

18

Implementation of the PWM gating and IGBT protection scheme for the grid-connected multilevel inverter applications

61%

Xu L. , Han Y. , Chen C. , Pan J. , Yao G. , Khan M. , Zhou L.

Przegląd Elektrotechniczny

|

2010

|

tom R. 86, nr 7

360-365

EN

A novel approach for implementation of the PWM gating and IGBT protection scheme is proposed for the grid-connected cascaded Hbridge multilevel inverter applications. The controller architecture based on the master/slave configuration is presented, with the main focus on the implementation issues of the bottom FPGA controller and IGBT drivers. The gating strategies and protection scheme are presented by introducing the hardware circuitry and the VHDL codes. Experimental results based on three H-bridge modules are provided for verification.

PL

Zaproponowano nową możliwość wykorzystania bramkowania PWM i protekcji IGBT w sieciowo połączonej kaskadzie wielopoziomowych przekształtników. Architektura kontrolera bazowała na konfiguracji master/slave. Strategia bramkowania i schemat zabezpieczeń zostały sprawdzone sprzętowo. Wyniki eksperymentu z trzema mostkowymi modułami typu H potwierdziły założenia. (Zastosowanie bramkowania PWM i zabezpieczenia IGBT w kratowo połączonym wielopoziomowym przekształtniku.

19

Exosome-derived uterine microRNAs isolated from cows with endometritis impede blastocyst development

61%

Wang X. , Tian F. , Chen C. , Feng Y. , Sheng X. , Guo Y. , Ni H.

Reproductive Biology

|

2019

|

tom 19

|

nr 2

20

Heavy metal concentrations in soil and agricultural products near an industrial district

61%

Guo Y.-B. , Feng H. , Chen C. , Jia C.-J. , Xiong F. , Lu Y.

Polish Journal of Environmental Studies

|

2013

|

tom 22

|

nr 5

EN

This study investigated heavy metals in soils and agricultural products near an industrial district in Dongguan City. The concentrations of Cu, Zn, Pb, Cd, Hg, and As in soil and agricultural products from vegetable and banana fields were determined. Results indicated that except for Zn in one sample and Cd in five samples, the majority of the samples were notably enriched by heavy metals compared with background values. The concentrations of heavy metals (mg·kg⁻¹ dry soil) in agricultural soils in the study area ranged from 22.2 to 93.0 for Cu, 31.2 to 213.6 for Zn, 47.6 to 133.5 for Pb, 0.01 to 0.67 for Cd, 0.15 to 0.56 for Hg, and 20.5 to 28.9 for As. Among these soil samples, concentrations of Cu, Zn, Cd, and Hg in 20.6%, 8.8%, 29.4% and 38.2% soil samples, respectively, exceeded Chinese maximum allowable concentrations (MAC) for agricultural soil. The concentrations of Zn, Pb, and Cd were significantly higher in vegetable than in banana fields. Cu, Zn, Pb, Cd, and Hg accumulated in the topsoil of vegetable fields, but only Pb and Hg accumulated in banana fields. Zn, Cd, and Hg accumulated more easily in flowering cabbage than other vegetables. Cu, Zn, and As were accumulated more easily in banana than lettuce, bunching onion and eggplant. Therefore, the findings suggest more attention should be focused on the accumulation of heavy metals in banana. This study presents a practical methodology for screening crops with lower bio-concentration factors for heavy metals to reduce metal contaminants in the general food supply chain.