Wyniki wyszukiwania - Biblioteka Nauki

1

Experiment and prediction of water content of sour natural gas with an modified cubic plus association equation of state

100%

Liu Y. , Zhu Y. , Zhu J.

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tom Vol. 20, nr 2

98--106

EN

In this work, new experimental value for water content in sour natural gas were reported. In addition, to predict the water content in sour natural gas, a modified cubic plus association equation of state (CPA-EoS) was also proposed. In this model, a new energy parameter a was proposed to make an accurate description of saturated liquid density. Additionally, a temperature dependent binary interaction parameter kij for six binary systems was also obtained. Lastly, a comparison between the prediction results of the modified CPA-EoS and the experimental data was presented, and the results showed that the modifi ed CPA-EoS could predict the water content in sour natural gas with high accuracy, which has an AAD of 3.6722% with experimental data in literatures and an AAD of 1.946% for experimental data reported in this work.

2

3D Measurement and Modelling of Magnetic Properties of Soft Magnetic Composite

100%

Zhu J. , Lin Z. , Guo Y. , Huang Y.

Przegląd Elektrotechniczny

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2009

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tom R. 85, nr 1

11-15

EN

The soft magnetic composite (SMC) is a new type of soft magnetic material made of insulated iron powders. Its special characteristics could enable the development of low cost high performance electrical machines. This paper presents the measurement and modelling of magnetic properties of SMC under 3D magnetizations. Detailed descriptions of the 3D magnetic property tester, principle of measurement, core loss models, and experimental results are included and discussed.

PL

Magnetycznie miękkie kompozyty (soft magnetic composites – SMC) są nowym rodzajem magnetycznie miękkich materiałów wykonanych z elektrycznie izolowanych cząsteczek proszku żelaza. Specjalne charakterystyki takich materiałów mogą umożliwić rozwój tanich i wydajnych maszyn elektrycznych. Artykuł prezentuje pomiary i modelowanie własności magnetycznych SMC w warunkach przemagnesowania 3D. Podano dokładny opis użytej techniki pomiarowej, modelu i wyników pomiarowych.

3

Toxicity evaluation of antibiotics in piggery wastewater by luminescent bacteria

100%

Sun J. , Li W. , Zheng P. , Zhu J.

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nr 3

EN

Antibiotics, as special pollutants in piggery wastewater, have negative effects on wastewater treatment processes. However, it is difficult to obtain a clear understanding of the toxic potency of antibiotics using the common inhibitory experiments of wastewater because of their low concentrations. Therefore, this study for the first time reports research on examining the toxic strength of piggery wastewater containing antibiotics by acute toxicity experiments using luminescent bacteria. Also reported herein for the first time were the mixed toxic effects of different antibiotics on luminescent bacteria using orthogonal experimental designs. Results showed that piggery wastewater had high ecotoxicity equal to 24.6 mg∙L⁻¹ HgCl₂, and the toxicity units (TU) of Chlortetracycline, amoxicillin, florfenicol, and sulfamethazine (SM₂) were 85.5, 64.72, 1.27, and 1.20, respectively, which fell under high or significant ecotoxicity according to the Toxicity Classification System (TCS). The IC₁₀ values indicated that the antibiotics could impose single or mixed toxic effects on luminescent bacteria even in trace concentrations. Among these antibiotics, Chlortetracycline was the most significant one needing more attention in the treatment of wastewater-containing antibiotics.

4

ASYMMETRIC LEAVES2-LIKE38 gene, a member of AS2/LOB family of Arabidopsis, casues leaf dorsoventral alternation in transgenic cockscomb plants

88%

Meng L.-S. , Liu H.-L. , Cui X. , Sun X.-D. , Zhu J.

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nr 6

EN

ASYMMETRIC LEAVES2-LIKE38/LBD41 gene of Arabidopsis is a member of the ASYMMETRIC LEAVES2 (AS2)/LATERAL ORGAN BOUNDARIES (LOB) domain gene family. To explore ASL38 function, we transformed 35S:ASL38 constructs into cockscomb (Celosia plumosus) plants via Agrobacterium tumefaciens and obtained T1 35S:ASL38 plants. The extremely folded or crinkly leaves were seen in these T1 cockscomb plants. The anatomical analysis of these malformed leaf blades indicated that adaxial cells revealed abaxialized traits, which were never seen in those of wild-type plants. These results suggested that ectopic expression of ASL38 might lead to alternations of dorsoventrality in folded or crinkly leaves of 35S:ASL38 cockscomb. In general, all data showed that ASL38 might be involved in dorsoventral determination in lateral organ development of plants.

5

Effect of nitrogen addition on soil respiration in a larch plantation

88%

Zhu J. , Kang F. , Chen J. , Cheng X. , Han H.

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tom 26

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nr 3

EN

Knowledge about the impact of nitrogen (N) addition on soil respiration (Rs) is critical for understanding soil carbon (C) balance and its responses to climate change. We conducted a long-term field experiment to evaluate the response of Rs to N addition in a larch (Larix principis-rupprechtii) plantation during the growing season in northern China. We applied four N (in the form of NH₄NO₃) levels, i.e., control (N0: 0 g N m⁻² year⁻¹), low-N (N1: 5 g N m⁻² year⁻¹), medium-N (N2: 10 g N m⁻² year⁻¹), and high-N (N3: 15 g N m⁻² year⁻¹) monthly starting in June 2015. The results showed that N addition – especially N2 and N3 levels – significantly stimulated Rs. N1 and N2 levels resulted in the increase of Rs in a short time, whereas the duration of N3 level can last across the whole month or at least 10 days. The results highlight the need for improving the Rs sampling interval after N addition to ensure more accurate evaluation of C emission. Soil temperature and soil moisture together explained more variations of Rs. N addition exhibited a slight increase in the sensitivity of Rs to temperature (Q₁₀), but no significant differences were found for the Q₁₀ among N levels.

6

The Theoretical Analysis Model and Statistical Test Research on Enterprises Development - A Study of Data from 195 Large and Medium Manufacturing Enterprises in China

88%

Yin H. , Guo T. , Li B. , Zhu J. , Sun X.

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tom R. 89, nr 3b

198--206

EN

On the basis of dynamic capabilities theory, this paper has put forward the theoretical analysis model and examined questionnaire data from 195 large and medium manufacturing enterprises in 2011 through statistical test methods including intermediary role term and SEM model. The results are as follows: first, in the test for basic constructs, the correlation of independent and dependent variables Sig. <0.001 and Pearson coefficient>0.500, all multiple correlation coefficient > 0.800, all determination coefficient R2 >0.650, Durbin-Watson coefficient approximated to 2.000, all check coefficient has presented distinct character, the whole regressive model explained variation achieved significant standard and all hypothesis have passed the statistical test. Secondly, during the tests for hypothesis with intermediary role term, the regressive coefficient intermediary variable was up to 0.723 and markedly different from 0(Sig. <0.001), the regressive coefficient of organization modularization, intellectual capital and knowledge resource were decreased respectively, determination coefficient R2 increased to 0.889 with significant higher explanation power. It shows that the regressive model with intermediary variable has influenced much on comprehensive regression effect and the hypothesis of intermediary role term have passed the statistical tests.

PL

W artykule przedstawiono analizę teoretyczną danych ze 195 dużych i średnich przedsiębiorstw produkcyjnych z 2011 roku. Wykorzystano do tego celu testy statystyczne, w tym model SEM. Zamieszczone wyniki pokazują, że zastosowany model regresyjny ze zmiennymi pośrednimi ma duży wpływ na ogólny efekt regresji. Analiza hipotezy o roli pośrednika, na podstawie dokonanych testów, okazała się prawdziwa.

7

Comprehensive characterization and quantification of phillyrin in the fruits of Forsythia suspensa and its medicinal preparations by liquid chromatography-ion trap mass spectrometry

75%

Chen J. , Chen Q. , Yu F. , Huang H. , Li P. , Zhu J. , He X.

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tom Vol. 28, no. 1

145--157

EN

A rapid and sensitive method for the identification and quantification of phillyrin (POG) in Forsythia suspense is described. The phillyrin standard solution was directly infused into the ion trap mass spectrometers (IT-MS) for collecting the MSn spectra. The electrospray ionization (ESI) mass spectral fragmentation pathway of phillyrin was proposed, and the ESI-MSn fragmentation behavior of phillyrin was deduced in detail. The major product ion at m/z 355 belongs to furofuran, which was formed by loss the glucopyranoside (180 Da), and the characteristic fragment ions m/z 473, 395, 337, 309, and 249 were observed. The loss of 18 Da could arise from two different fragmentation pathways, and the observed ion was composed of a mixture of two different structural ions. Quantification of phillyrin was assigned in positive-ion mode at a product ion at m/z 557 → 355 by liquid chromatography-mass spectrometry (LC-MS). The LC-MS method was validated for linearity, sensitivity, accuracy, and precision and then used to determine the content of the phillyrin. Lastly, the LC-MS method was successfully applied to determine phillyrin in real sample F. suspense and three of its medicinal preparations in the positive mode at the first time.

8

Preparation of micro-encapsulated strawberry fragrance and its application in the aromatic wallpaper

75%

Xiao Z. , Zhang Y. , Zhu G. , Niu Y. , Xue Z. , Zhu J.

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2017

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tom Vol. 19, nr 1

89--94

EN

Micro-encapsulated strawberry fragrance was successfully prepared with wall materials including maltodextrin, sodium octenylsuccinate and gum Arabic. The micro-capsule was added to wallpaper and aromatic wallpaper with strawberry characteristics was obtained. The particle distribution, surface morphology, chemical structure, thermal property and controlled release performance of micro-encapsulated fragrance and aromatic wallpaper were investigated using laser particle size analyzer, scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-TR), thermal gravity analysis (TGA) and chromatography-mass spectrometer (GC-MS). The results showed that the average diameter of micro-capsule was 2 μm and the particles mainly distributed in the tissues of wallpaper. The result of TGA showed that the micro-capsule had a good stability. Meanwhile, the aromatic wallpaper had strawberry aroma more than 3 months and took on excellent controlled release performance.

9

Double-layer microwave absorber based on nanocrystalline CoFe2O4 and CoFe2O4/PANI multi-core/shell composites

75%

Xu Y. , Shen G. , Wu H. , Liu B. , Fang X. , Zhang D. , Zhu J.

Materials Science Poland

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2017

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tom Vol. 35, No. 1

94--104

EN

Organic-inorganic nano-CoFe2O4/PANI (polyaniline) multi-core/shell composites have been successfully synthesized by chemical oxidative polymerization of aniline. The characterization results showed that the ferrite nanocrystals were efficiently embedded in PANI. The electromagnetic parameters of the composites were measured by a vector network analyser in the frequency range of 2 GHz to 18 GHz. Double-layer absorbers based on the CoFe2O4/PANI composite (matching layer) and calcined CoFe2O4 ferrite (absorbing layer) have been designed. The reflection loss of the microwave absorbers of both single layer and double-layer with a total thickness of 2.0 mm and 2.5 mm was calculated according to transmission-line theory. The results indicated that the minimum reflection loss of the CoFe2O4/PANI composite was −19.0 dB at 16.2 GHz at the thickness of 2.0 mm and −23.6 dB at 13.1 GHz at the thickness of 2.5 mm, respectively. The minimum reflection loss for double-layer absorbers reached −28.8 dB at 16.2 GHz at the total thickness of 2.0 mm, and −31.1 dB at 12.8 GHz at the total thickness of 2.5 mm. The absorption bandwidth under −10 dB was 4.2 GHz (13.8 GHz to 18.0 GHz) and 5.5 GHz (10.3 GHz to 15.8 GHz), respectively. The results show that the reflection loss and absorption bandwidth of the double-layer absorbers are obviously enhanced compared to corresponding single layer absorbers.

10

Development of a method for comprehensive and quantitative analysis of Yohimbine in Pausinystalia yohimbe by liquid chromatography-ion trap mass spectrometry

75%

Chen Q. , Li P. , Li B. , Yuan F. , Li X. , Zhu J.

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tom Vol. 23, no. 4

629--639

EN

A rapid and sensitive method for the identification and quantification of yohimbine in Pausinystalia yohimbe is described. The method used is liquid chromatography-quadrupole ion trap mass spectrometry (LC-QIT/MS). The yohimbine standard solution was directly infused into the ion trap mass spectrometers (IT/MS) for collecting the MSn spectra. The major fragment ions of yohimbine were confirmed by MSn at m/z 355, 224, 212, and 144, in the positive-ion mode. The possible main fragment ion cleavage pathway was studied. Yohimbine provided good signals corresponding to the protonated molecular ion [M + H]+. The method is reliable and reproducible, and the detection limit is 0.1 ng mL-1. The method was validated in the concentration range 0.1–50 μg mL-1; the intra- and interday precision ranged from 1.36% to 2.73%; and the accuracy was 96.5–108.2%. The mean recovery of yohimbine was 97.1–101% with a relative standard deviation (RSD) <1.93%. The LC-IT/MS method was successfully applied to determine the yohimbine in P. yohimbe.

11

Potential suitable habitat distribution and conservation strategy for the Siberian crane (Grus leucogeranus) at spring stopover sites in Northeastern China

63%

Wen D. , Hu Y. , Xiong Z. , Chang Y. , Li Y. , Wang Y. , Liu M. , Zhu J.

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nr 5