Wyniki wyszukiwania - Biblioteka Nauki

1

Comparisons of thermal and evaporative resistances of kapok coats and traditional down coats

100%

Wang F.

Fibres & Textiles in Eastern Europe

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2010

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tom Vol. 18, no. 1 (78)

75--78

EN

The main aim of this paper is to contribute to finding a good solution to the ethical problem of live plucking. The use of new eco-environmental kapok fibres as a coat filler substitute for traditional duckling down was reported. The physical structures of kapok fibre were studied by scanning electron microscopy (SEM). The thermal and evaporative resistance properties of twelve sets of traditional duckling down coats and kapok coats were measured and compared using a novel sweating thermal manikin called “Walter”. The results showed that there are no significant statistical differences in thermal and evaporative resistances among traditional duckling down coats and kapok coats. It was also found that there is the best mix rate of material and air trapped inside, which provides the best thermal resistance for the coat. Finally, we proposed that kapok fibres be used as a coat filling to lower the product price. Most importantly, the use of kapok fibre results in as good thermal and evaporative resistances of a coat as with traditional duckling down.

PL

Głównym celem pracy było znalezienie technologii pozwalającej zastąpić tradycyjny puch kaczy wypełnieniem z włókien kapoku. Strukturę włókien kapoku badano przy użyciu SEM. Badano właściwości termiczne i przepuszczalność pary wodnej dla 12 zestawów ubrań wykonanych z puchu kaczego i kapoku, które porównano również przy użyciu specjalnie opracowanego manekinu uwzględniającego pocenie się osoby badanej. Wyniki badan wykazały, że nie istnieją statystycznie istotne różnice badanych właściwości. Stwierdzono również, że istnieje optymalny stosunek włókien kapokowych i powietrza w wypełnieniu ubrań ochronnych. W wyniku badań zaproponowano stosowanie kapoku zamiast puchu kaczego dla obniżenie ceny produktu.

2

Pulsation signals analysis of turbocharger turbine blades based on optimal EEMD and TEO

100%

Wang F.

Polish Maritime Research

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2019

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tom 26

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nr 3

EN

Turbocharger turbine blades suffer from periodic vibration and flow induced excitation. The blade vibration signal is a typical non-stationary and sometimes nonlinear signal that is often encountered in turbomachinery research and development. An example of such signal is the pulsating pressure and strain signals measured during engine ramp to find the maximum resonance strain or during engine transient mode in applications. As the pulsation signals can come from different disturbance sources, detecting the weak useful signals under a noise background can be difficult. For this type of signals, a novel method based on optimal parameters of Ensemble Empirical Mode Decomposition (EEMD) and Teager Energy Operator (TEO) is proposed. First, an optimization method was designed for adaptive determining appropriate EEMD parameters for the measured vibration signal, so that the significant feature components can be extracted from the pulsating signals. Then Correlation Kurtosis (CK) is employed to select the sensitive Intrinsic Mode Functions (IMFs). In the end, TEO algorithm is applied to the selected sensitive IMF to identify the characteristic frequencies. A case of measured sound signal and strain signal from a turbocharger turbine blade was studied to demonstrate the capabilities of the proposed method

3

Wideband optical frequency comb generation using a fiber re-circulating loop cascaded with a spectrum expander including highly nonlinear fiber

63%

Wang F. , Kang W.

Optica Applicata

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2021

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tom Vol. 51, nr 2

181--191

EN

A wideband optical frequency comb (OFC) generator using a fiber re-circulating loop (FRL) including a phase modulator and optical amplifier, cascaded with a spectrum expander containing a high-power erbium-doped fiber amplifier and highly nonlinear fiber (HNLF) is proposed and experimentally demonstrated, in which the FRL is used as a source to generate seed comb lines, and then generated seed comb lines are extended to a wideband optical frequency comb using cascaded four-wave mixing in the HNLF. Only using one stage spectrum expander, a stable 20-GHz optical comb with 201 comb lines within 30-dB power deviation, spanning 40-nm bandwidth, is achieved. The results show that the HNLF has unique ability to broaden output spectrum from the FRL. In addition, an optical frequency comb is dramatically broadened, which may be predicted by optimizing gain and dispersion of the FRL or configuration of the spectrum expander, or both.

4

Dynamic response analysis of drill pipe considering horizontal movement of platform during installation of subsea production tree

63%

Wang F. , Chen N.

Polish Maritime Research

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2020

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tom 27

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nr 3

5

Multimodal biometric authentication based on score level fusion using support vector machine

63%

Wang F. , Han J.

Opto-Electronics Review

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2009

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tom Vol. 17, No. 1

59-64

EN

Fusion of multiple biometrics for human authentication performance improvement has received considerable attention. This paper presents a novel multimodal biometric authentication method integrating face and iris based on score level fusion. For score level fusion, support vector machine (SVM) based fusion rule is applied to combine two matching scores, respectively from Laplacianface based face verifier and phase information based iris verifier, to generate a single scalar score which is used to make the final decision. Experimental results show that the performance of the proposed method can bring obvious improvement comparing to the unimodal biometric identification methods and the previous fused face-iris methods.

6

Investigation of a tunable and switchable multi-wavelength bidirectional Brillouin-erbium fiber ring laser

63%

Wang F. , Yuan R. Y.

Optica Applicata

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2021

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tom Vol. 51, nr 3

375--389

EN

A multi-wavelength bidirectional Brillouin-erbium fiber ring laser with switchable Brillouin frequency spacing (BFS) is proposed and experimentally demonstrated. In the presented Brillouin-erbium ring laser, including an optical amplifier and a highly nonlinear fiber, and without any optical isolator, due to Rayleigh scattering, stimulated Brillouin scattering, and cascaded four-wave mixing initiated successively by the Brillouin pump (BP) light, the odd- and even-order Stokes lines are generated and circulate in the opposite direction in the ring cavity. The BP light and Stokes-induced Rayleigh backscattering light also simultaneously circulate in the ring cavity. Only by adjusting BP power, the gain competition between Brillouin based Stokes and cavity modes’ oscillation can be controlled, the laser output can be conveniently switched between single BFS and odd- or even-order double BFS. In addition, under the certain BP power conditions, the proposed multi-wavelength Brillouin-erbium fiber laser also can realize switchable odd- or even-order Stokes generation and Stokes generation with single BFS, with an increasing wavelength number in turn, only by simply adjusting pump power of the erbium-doped fiber amplifier. Stability and wavelength tunability of the proposed multi-wavelength bidirectional Brillouin-erbium fiber ring laser are also investigated, respectively.

7

Nonlinear stability of corrugated shallow spherical shell

63%

Liu R. H. , Wang F.

International Journal of Applied Mechanics and Engineering

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2005

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tom Vol. 10, no 2

295-309

EN

In this paper, a nonlinear bending theory for a corrugated shallow spherical shell is constructed. By means of this theory and the modified iteration method, the analytical solution of the critical buckling pressure for a corrugated shallow spherical shell with a rigidly clamped edge under the action of uniform pressure is obtained.

8

Investigation of a selectable multi-passband microwave photonic filter based on cascaded optical comb filters

63%

Wang F. , Peng M. M.

Optica Applicata

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2021

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tom Vol. 51, nr 3

457--467

EN

A multi-passband microwave photonic filter (MPF) with selectable passband frequency, spanning 0-20 GHz frequency range, is proposed, and experimentally demonstrated, in which passband frequency can be flexibly selected within a maximum passband number to four. The scheme is based on the generation of tunable optical comb lines using a broadband optical source sliced by cascaded optical comb filters, achieved by connecting an in-line birefringence fiber filter and a reconfigurable Lyot filter in series, such that various filter tap spacing and spectral combinations are obtained for the configuration of the MPF. The proposed MPF can operate with four different passband states, namely, single-, dual-, triple-, and quadruple-passband, only by adjusting polarization states of the cascaded optical comb filters. All these passbands are with a 3-dB bandwidth varying from 200 to 460 MHz and more than 20-dB sidelobe suppression.

9

Effects of phytogenic products on in vitro rumen fermentation and methane emission in goats

51%

Dong G. Z. , Wang X. J. , Liu Z. B. , Wang F.

Journal of Animal and Feed Sciences

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2010

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tom 19

|

nr 2

218-229

EN

This study evaluated the effects of addition of lucerne extract (LE), Artemisiae annuae extract (AAE), and mixed herbal medicine (MHM) into different goat diets on in vitro rumen fermentation and methane production. In addition to the negative control (NC), addition of monensin (MO) served as the positive control (PC). Four ruminally cannulated Nanjiang Yellow goats (45 ± 2 kg liveweight) were used as donors of ruminal fluid. The results showed: 1. compared with NC, addition of all the additives into the mixed grass diet increased propionate concentration (P<0.05). Protozoa numbers and methane production were reduced by addition of all the additives (P<0.05); 2. compared with NC, LE and AAE in the lucerne diet increased propionate concentration (P<0.05). All the additives reduced protozoa numbers (P<0.05). Methane production was decreased by addition of LE compared with NC and PC (P<0.05); 3. addition of LE into the mixed grass-concentrate diet resulted in an increase of the propionate concentration compared with NC and PC (P<0.05). Protozoa numbers were reduced by addition of LE and AAE compared with NC (P<0.05). Methane production was decreased by addition of AAE compared with NC and PC (P<0.05); 4. compared with NC, addition of AAE and MHM into the lucerne-concentrate diet resulted in an increase of propionate concentration (P<0.05). Protozoa numbers were reduced by addition of all the additives (P<0.05). Methane production was decreased by addition of AAE and MHM (P<0.05). In conclusion, addition of LE, AAE and MHM into different diets reduced methane production, increased propionate concentration and decreased protozoa numbers to a certain extent, and the inhibitory effects of the phytogenic products on methane production are more remarkable in the mixed-grass diet. The phytogenic products appear to be promising alternatives to MO in altering in vitro rumen fermentation and reducing methane production in goats.

10

Elastic-plastic analysis for circumferential through crack at boundary of semi’s brace under beam wave

51%

Wang F. , Deng X. , Li Y.

Polish Maritime Research

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2018

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tom nr 4

106--113

EN

In order to ensure the safety and reliability of the horizontal brace of semi-submersible platform (SEMI) which functions as the supporting structure in SEMI, this article presents an elastic-plastic method to analyze the variations of the crack tip opening displacement, elastic zone and plastic zone of the cracked section of the horizontal brace under beam wave. The brace of the SEMI was assumed to be located a circumferential through crack at its boundary in this article. In addition, the cracked section of the brace has been divided into crack zone, tensile plastic zone, elastic zone and compressive plastic zone in the presented theoretical model. Moreover, the closed form of the solution has been found in this article which is especially suitable solving complicated problems in practical engineering application. Also, a typical new-generation SEMI that is in practical use was selected to analyze the variation tendency of the cracked brace’s parameters using the proposed model which could give good suggestion to semi-submersible platform designers and managers.

11

Coupling mechanism and coupling degree measurement model of shipbuilding industry cluster

51%

Su Y. , Wang F. , An X.

Polish Maritime Research

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2016

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tom S 1

78--85

EN

This article was aimed to analyse the working condition of the coupling mechanism in Chinese shipbuilding industry cluster. Literature review was conducted to unveil the coupling mechanism of shipbuilding industry cluster, providing analysis of the present development of shipbuilding industry. A theoretical model was proposed by using the efficacy function and the capacity of the coupling coefficient while measuring the coupling of the shipbuilding industry cluster. Four coupling characteristics were found including relevant, systemic, diversity, and collaborative in the shipbuilding industry cluster. The shipbuilding industry cluster has two levels of coupling mechanism including the core layer coupling mechanism and the support layer coupling mechanism respectively. The improvement through coupling the core layer, support layer, and the coupling between two levels, is an effective way to achieve long-term stable development in Chinese shipbuilding industry cluster.

12

An improved method for evaluating regional resource carrying capacities: a case study of the Tarim River basin in Arid China

51%

Wang F. , Wang C. , Ye Y. , Wen B.

Polish Journal of Environmental Studies

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2019

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tom 28

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nr 4

EN

Resource endowment and resource carrying capacity (RCC) are the most important cornerstones of regional sustainable development. By applying a newly established RCC method, namely, the relative resources carrying capacity (RRCC) method, we evaluated the RCC in the Tarim River basin (TRB) in arid China in Xinjiang during 2000-2011. Research results show that the relative resources carrying capacity can be effectively served as indicators of regional resources sustainable development status. Taking Xinjiang as the reference region, the TRB can be characterized as an area with an overloaded population and surplus economy during the whole research period, where land resources are relative advantage resources carrying the regional population growth and economic development and water resources are relative disadvantage resources restricting rapid regional development. Taking TRB as the reference region, 42 counties and cities in TRB performed significant temporal and spatial disparities according to the RRCC based on population and economic perspectives. Based on the spatial-temporal evolution of RRCC, 42 counties and cities in TRB were classified into four matching modes (A, B, C, and D). The spatial-temporal evolution characteristics and mechanisms about the 42 prefectures and cities were examined, and the suitable development strategies for every different mode were recommended.

13

Development Processes and Property Measurements of Moisture Absorption and Quick Dry Fabrics

51%

Wang F. , Zhou X. , Wang S.

Fibres & Textiles in Eastern Europe

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2009

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tom Vol. 17, no. 2 (73)

46--49

EN

In this study, a new type of honeycomb-patterned micro-porous polyester fibre was used to develop good moisture absorption and quick drying properties of woven fabrics. Details of the development and after-finish processes of the fabrics were illustrated. The water transport, vapour transmission and quick dry properties of the seven different end products were also investigated. It was evident that weaving parameters and after-finish processes are crucial factors in the fabric production process. The final products can also have good water transport and quick dry properties without additive treatment.

PL

Nowy rodzaj mikroporowatych włókien poliestrowych o strukturze plastra miodu został użyty do opracowania tkanin wykazujących dobrą absorpcję wilgoci i szybkoschnących. Przedstawiono szczegółowo opracowanie tych tkanin oraz procesy wykańczalnicze. Dla siedmiu wyprodukowanych tkanin określono transport wody, przepuszczalność pary wodnej oraz szybkość schnięcia. Wykazano jednoznacznie że parametry procesu tkania i wykańczania tkanin są decydującymi właściwościami dla otrzymania odpowiednich parametrów tkanin. stwierdzono również, że produkty finalne mogą wykazywać dobry transport wody i szybkie schnięcie bez dodatkowej obróbki.

14

Foxo3a aggravates inflammation and induces apoptosis in IL-1-treated rabbit chondrocytes via positively regulating tenascin-c

51%

Wang F. , Wang Q. , Zhu M. , Sun Q.

Folia Histochemica et Cytobiologica

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2020

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tom 58

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nr 1

15

Elastic-plastic analysis for circumferential through crac at boundary of semi's brace under beam wave

51%

Wang F. , Deng X. , Li Y.

Polish Maritime Research

|

2018

|

tom 25

|

nr 4

EN

In order to ensure the safety and reliability of the horizontal brace of semi-submersible platform (SEMI) which functions as the supporting structure in SEMI, this article presents an elastic-plastic method to analyze the variations of the crack tip opening displacement, elastic zone and plastic zone of the cracked section of the horizontal brace under beam wave. The brace of the SEMI was assumed to be located a circumferential through crack at its boundary in this article. In addition, the cracked section of the brace has been divided into crack zone, tensile plastic zone, elastic zone and compressive plastic zone in the presented theoretical model. Moreover, the closed form of the solution has been found in this article which is especially suitable solving complicated problems in practical engineering application. Also, a typical new-generation SEMI that is in practical use was selected to analyze the variation tendency of the cracked brace’s parameters using the proposed model which could give good suggestion to semi-submersible platform designers and managers

16

Theoretical study on wavelength conversion using cross-polarization modulation in a single semiconductor optical amplifier

51%

Wang F. , Xia G. , Wu Z.

Optica Applicata

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2005

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tom Vol. 35, nr 2

365-375

EN

Wavelength conversion based on the cross-polarization modulation (XPM) in a single semiconductor optical amplifier (SOA) has been numerically investigated by using the theoretical model in which the birefringence has been taken into account. The results show that the non-inverted and inverted wavelength conversion can be realized through selecting reasonably the parameters; there exit some differences in the chirp, extinction ratio (ER), and eye diagram of the converted signal between the non-inverted and inverted conversion; with the increase of the bit rate, the chirp increases and the eye opening ratio (EOR) decreases.

17

Identification and characterization of differentially expressed genes from tobacco roots after decapitation

51%

Qi Y. , Ma L. , Wang F. , Liu W.

Acta Physiologiae Plantarum

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2012

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tom 34

|

nr 2

EN

Nicotine is the major alkaloid in tobacco and its biosynthesis is regulated by a variety of factors. Topping, as an important agronomic factor, can induce the nicotine biosynthesis increase. Some key nicotine biosynthesisrelated genes and the framework of nicotine biosynthesis pathway have been well studied, but the details of nicotine biosynthesis pathway are not well understood now. To investigate the genes expressed after tobacco topping, we constructed a suppression subtractive hybridization library using cDNA from control tobacco plants as driver and those from topped tobacco plants as tester. The insert size of positive clones was 200–1,000 bp confirmed by PCR. After differential screening, 560 significantly differently expressed clones among 1,950 positive clones were acquired, sequenced and 273 high quality expressed sequence tags (ESTs) were acquired. The results of nucleotide blast homological analysis indicated that these ESTs mainly involved in alkaloid biosynthesis (4%), plant hormone metabolism (3%), signaling/transcription (18%), stress/ defense (32%), protein metabolism (9%), carbon metabolism (6%), other metabolism (15%) and function unknown (13%). The expression of selected genes was analyzed by reverse transcription polymerase chain reaction and RNA gel blot hybridization, and the result indicated that their transcription amount increased after tobacco topping. NtNAC-R1was in silico cloned, and the expression level of NtNAC-R1 increased at 12 and 24 h in tobacco roots after topping, which indicated that NtNAC-R1 may play an important role in the signal transduction after tobacco topping. In addition to many previously reported nicotine biosynthesis-related genes, some new genes, such as transcription factors related to nicotine biosynthesis/regulation and the members of plant hormone pathway, were discovered in our library. The results contribute new data to the list of possible candidate genes involved in nicotine biosynthesis and regulation.

18

Parallel and Serial Methods of Calculating Thermal Insulation in European Manikin Standards

51%

Kuklane K. , Gao C. , Wang F. , Holmer I.

International Journal of Occupational Safety and Ergonomics

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2012

|

tom Vol. 18, No. 2

171--179

EN

Standard No. EN 15831:2004 provides 2 methods of calculating insulation: parallel and serial. The parallel method is similar to the global one defined in Standard No. ISO 9920:2007. Standards No. EN 342:2004, EN 14058:2004 and EN 13537:2002 refer to the methods defined in Standard No. EN ISO 15831:2004 for testing cold protective clothing or equipment. However, it is necessary to consider several issues, e.g., referring to measuring human subjects, when using the serial method. With one zone, there is no serial–parallel issue as the results are the same, while more zones increase the difference in insulation value between the methods. If insulation is evenly distributed, differences between the serial and parallel method are relatively small and proportional. However, with more insulation layers overlapping in heavy cold protective ensembles, the serial method produces higher insulation values than the parallel one and human studies. Therefore, the parallel method is recommended for standard testing.

19

Reliability Evaluation of Distribution System with Multiple Micro-Sources

51%

Wang F. , Qi Y. , Fu Z.

Przegląd Elektrotechniczny

|

2013

|

tom R. 89, nr 1b

266--270

EN

A new minimal path model of reliability evaluation of distribution system with multiple micro-sources is presented to analyze the effect of different type micro-source to the distribution system reliability in which the control mode of micro-source, the network configuration, operation and control characteristics of microgrid are fully considered. The results of the RBTS bus 6 verify the validity of the model and show the remarkable different effect of different type micro-source and its control mode to the reliability of distribution system.

PL

Analizowano niezawodność sieci z dołączonymi mikro-źródłami. Rozważono konfiguracje sieci oraz charakterystyki sterowania.

20

A Review of Technology of Personal Heating Garments

51%

Wang F. , Gao C. , Kuklane K. , Holmer I.

International Journal of Occupational Safety and Ergonomics

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2010

|

tom Vol. 16, No. 3

387--404

EN

Modern technology makes garments smart, which can help a wearer to manage in specific situations by improving the functionality of the garments. The personal heating garment (PHG) widens the operating temperature range of the garment and improves its protection against the cold. This paper describes several kinds of PHGs worldwide; their advantages and disadvantages are also addressed. Some challenges and suggestions are finally addressed with regard to the development of PHGs.