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Wyświetlanie 1-15 z 18
Tytuł:
Removal of uranium(VI) from aqueous solution by rice husk
Autorzy:
Xia, L.
Li, R.
Xiao, Y.
Zheng, W.
Tan, K.
Powiązania:
https://bibliotekanauki.pl/articles/208201.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
wheat straw
biosorption
uranium
ions
biosorpcja
słoma zbożowa
uran
jony
Opis:
Basic aspects of uranium adsorption by rice husk have been investigated. The influences of various experimental parameters such as pH, time, adsorbent dosage, rice husk size, temperature and various concentrations of uranium on uptake were evaluated. The thermodynamics and kinetics of adsorption were analyzed by FT-IR and SEM. The adsorption capacity for uranium on rice husk increased upon increasing initial concentration of uranium and temperature, while decreased with the increase of the amount of rice husk. Maximum uranium adsorption was observed at pH = 3 and particle size between 120 μm and 150 μm. Adsorption equilibrium was achieved within 60 min. At 25 °C, the saturated adsorption capacity qmax was up to 15.14 mg/g when the initial concentration of uranium ranged from 10 to 400 mg/dm3. The adsorption of uranium followed Langmuir adsorption isotherm and according to quasi-second order kinetic equation. The calculated values of ΔH°, ΔS°, and ΔG° indicated that the biosorption process was endothermic and spontaneous. Based on FT-IR spectra it may be concluded that hydroxyl, carbonyl, P–O and Si=O groups are the main active sites.
Źródło:
Environment Protection Engineering; 2017, 43, 4; 41-53
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Internet + maritime emergency management platform – a case study of the Liujiaxia reservoir area in Gansu Province, China
Autorzy:
Meng-xia, L.
Jun-min, M.
Xin-yu, G.
Shuai, G.
Powiązania:
https://bibliotekanauki.pl/articles/135607.pdf
Data publikacji:
2018
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
internet
maritime emergency management platform
tourism in the inland waters
shipping safety
rapid development
rescue plan
Opis:
With the development of tourism in the inland waters, various types of accidents in the waters have posed a great threat to human life, property, and the environment. This has caused concern in all circles of society. According to water tourism safety issues, and relying on Internet technology, shipping safety, and public safety management theory, this paper has proposed the concept and design plan of an Internet + maritime emergency management platform. This platform includes functions such as the intelligent perception of a ship’s navigation status, the scientific selection of a maritime emergency rescue site, the emergency rescue scene, the online dynamic management of maritime emergency resources, and the online production of a maritime emergency rescue plan. The design scheme has been used in the platform’s development. This paper has taken the application of the Internet + maritime emergency management platform for the Liujiaxia reservoir in the Gansu Province of China as an example. The results showed that the design of the platform that has been proposed in this paper is reasonable and that it can provide scientific, fast and accurate decision information for emergency command in the Liujiaxia reservoir and improve the effective control of the accident site as well as the use of resources.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2018, 56 (128); 78-85
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design and Experiment on the Compact, Portable Pulse Forming Line
Autorzy:
Xia, L.
Shi, J.
Chen, D.
Zhang, H.
Zhang, L.
Deng, J.
Powiązania:
https://bibliotekanauki.pl/articles/1807991.pdf
Data publikacji:
2009-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
84.70.+p
77.90.+k
Opis:
Some research has been done on making the compact, portable pulse forming line. A kind of ceramic and a kind of newly developed composite polymer are both used as the dielectric of the planar pulse forming line. The ceramic's dielectric constant ranges from 200 to 600 and the composite polymer's dielectric constant ranges from 100 to 200. It is easier to manufacture the large composite polymer dielectric bulks than to manufacture the ceramic bulks. In the experiments, using the large composite polymer bulk as the dielectric, the planar Blumlein line generated the pulse up to 100 kV with duration 90 ns. Using the ceramic bulk as the dielectric, the planar line generated the voltage pulse up to 60 kV with duration 92 ns.
Źródło:
Acta Physica Polonica A; 2009, 115, 6; 1192-1193
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Colloidal crystal cladded microfiber for refractive index sensing
Autorzy:
Yan, H. T.
Zhao, X Y
Zhang, Ch.
Zhen, Z Q
Li, Q Z
Cao, J X
Xia, L X
Powiązania:
https://bibliotekanauki.pl/articles/174902.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
microfibers
colloidal crystals
refractive index sensing
Opis:
We investigate the evanescent field of a microfiber wrapped by colloidal crystals. The microfiber has the diameter of about 1 μm that is drawn from a single-mode fiber with an alcohol lamp. The colloidal spheres are further attached to the microfiber through thermal evaporation, then they self-assemble to crystal-like structures. The 400 nm, 590 nm, and 710 nm-diameter SiO2 colloidal spheres are used, respectively. The spectral responses are studied theoretically and experimentally, and the results agree with each other. It is revealed that the evanescent field of a microfiber could be modulated by the photonic band-gap of colloidal crystals. This characteristic is very useful in refractive index sensing for liquids.
Źródło:
Optica Applicata; 2014, 44, 2; 309-315
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Endoreversible Four-Reservoir Chemical Potential Transformer with Diffusive Mass Transfer Law
Autorzy:
Xia, D.
Chen, L.
Sun, F.
Powiązania:
https://bibliotekanauki.pl/articles/1493376.pdf
Data publikacji:
2011-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.70.Ln
82.60.Lf
Opis:
The performance of an isothermal endoreversible four-reservoir chemical potential transformer, in which the mass transfer between the mass reservoir and the working medium obeys diffusive law, is analyzed and optimized in this paper. The relation between the rate of energy pumping and the coefficient of performance of the isothermal chemical potential transformer is derived by using finite-time thermodynamics. Moreover, the optimal operating regions and the influences of some parameters on the performance of the cycle are studied. The results obtained herein can provide some new theoretical guidelines for the optimal design of a class of apparatus such as mass exchangers, as well as electrochemical, photochemical, and solid-state devices, and the fuel pumps for solar-energy conversion systems.
Źródło:
Acta Physica Polonica A; 2011, 120, 3; 378-383
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Endoreversible Modeling and Optimization of a Multistage Heat Engine System with a Generalized Heat Transfer Law via Hamilton-Jacobi-Bellman Equations and Dynamic Programming
Autorzy:
Xia, S.
Chen, L.
Sun, F.
Powiązania:
https://bibliotekanauki.pl/articles/1504513.pdf
Data publikacji:
2011-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.70.-a
05.60.Cd
05.70.Ln
Opis:
A multistage endoreversible Carnot heat engine system operating between a finite thermal capacity high-temperature fluid reservoir and an infinite thermal capacity low-temperature environment with a generalized heat transfer law [q ∝ ( Δ $(T^{n}))^{m}$] is investigated in this paper. Optimal control theory is applied to derive the continuous Hamilton-Jacobi-Bellman equations, which determine the optimal fluid temperature configurations for maximum power output under the conditions of fixed initial time and fixed initial temperature of the driving fluid. Based on the general optimization results, the analytical solution for the case with Newtonian heat transfer law [q ∝ Δ(T)] is further obtained. Since there are no analytical solutions for the other heat transfer laws, the continuous Hamilton-Jacobi-Bellman equations are discretized and the dynamic programming algorithm is adopted to obtain the complete numerical solutions of the optimization problem, and the relationships among the maximum power output of the system, the process period and the fluid temperature are discussed in detail. The results show that the optimal high-temperature fluid reservoir temperature for the maximum power output of the multistage heat engine system with Newtonian and linear phenomenological [q ∝ Δ $(T^{-1})$] heat transfer laws decrease exponentially and linearly with time, respectively, while those with the Dulong-Petit [q∝$(Δ T)^{1.25}$], radiative [q∝ Δ $(T^4)$] and [q∝$(Δ(T^4))^{1.25}$] heat transfer laws are different from the former two cases significantly.
Źródło:
Acta Physica Polonica A; 2011, 119, 6; 747-760
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Plasma metabolic differences in cows affected by inactive ovaries or normal ovarian function post partum
Autorzy:
Zhao, C.
Hu, P.
Bai, Y.L.
Xia, C.
Powiązania:
https://bibliotekanauki.pl/articles/2087365.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dairy cows
inactive ovaries
gas chromatography/mass spectrometry
multivariate statistical analysis
differential metabolites
Źródło:
Polish Journal of Veterinary Sciences; 2020, 23, 1; 59-67
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Internal Friction of Li7La3Zr2O12 Based Lithium Ionic Conductors
Autorzy:
Wang, X. P.
Song, L.
Hu, J.
Xia, Y. P.
Xia, Y.
Gao, Y. X.
Zhang, L. C.
Magalas, L. B.
Fang, Q. F.
Powiązania:
https://bibliotekanauki.pl/articles/958222.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
lithium ionic conductor
Li7La3Zr2O12
internal friction
Opis:
The diffusion mechanisms of lithium ions in tetragonal phase as well as in Al and Nb stabilized cubic Li7La3Zr2O12 compounds were investigated by low-frequency internal friction technique. In the cubic Li7La3Zr2O12 phase, a remarkable relaxation-type internal friction peak PC with a peak height up to 0.12 was observed in the temperature range from 15°C to 60°C. In the tetragonal phase however, the height of the PT peak dropped to 0.01. The obvious difference of the relaxation strength between the cubic and tetragonal phases is due to the different distribution of lithium ions in lattice, ordered in the tetragonal phase and disordered in the cubic phase. Based on the crystalline structure of the cubic garnet-type Li7La3Zr2O12 compound, it is suggested that the high internal friction peak in the cubic phase may be attributed to two diffusion processes of lithium ions: 96h↔96h and 96h↔24d.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 1; 21-24
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy feature of a multi-flow column flotation process
Autorzy:
Cheng, G.
Yu, Y.
Ma, L.
Xia, W.
Xu, H.
Powiązania:
https://bibliotekanauki.pl/articles/109768.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
flotation column
turbulent kinetic energy
turbulent dissipation rate
bubble
Opis:
A cyclonic-static micro-bubble flotation column (FCSMC) has been widely used in mineral separation. FCSMC includes countercurrent, cyclone and jet flow mineralization zones in a single column. In this study, the energy feature of the three different zones was compared. The turbulent flow was evaluated in terms of the turbulent kinetic energy (k) and the turbulent dissipation rate (ε). An appropriate computing model was determined by comparing the flow field value measured by PIV with the results of the Fluent numerical simulation. Jet flow separation exhibited the maximum k and ε values among the three columns, whereas counter-current separation displayed the minimum values. The high circulating volumetric flowrate means great energy input and turbulent intensity. The higher turbulent dissipation rate, the smaller the bubble is. The better performance of the FCSMC was mainly attributed to the multiple mineralization steps. The floatability of mineral particles gradually decreases with an increase in flotation time, the mineralization energy gradually increased to overcome the decrease in mineral floatability. By contrast, the countercurrent was beneficial for recovering the coarse particles, and the jet flow was beneficial for recovering the fine particles.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 2; 1266-1284
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Expression and immunological evaluation of elongation factor Tu of Streptococcus suis serotype 2
Autorzy:
Xia, X.J.
Wang, L.
Cheng, L.K.
Shen, Z.Q.
Li, S.G.
Wang, J.L.
Powiązania:
https://bibliotekanauki.pl/articles/31256.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Streptococcus suis serotype 2 (SS2) is considered as a major pathogen that causes sepsis and meningitis in piglets and humans, but knowledge of its antigenic proteins remains limited so far. The surface-related proteins of pathogens often play significant roles in bacterium-host interactions and infection. Here, we obtained the elongation factor Tu (EF-Tu) gene of Streptococcus suis and constructed the recombinant expression plasmid successfully. The target recombinant plasmid was then expressed in Escherichia coli and the immuno-protection of the recombinant protein was subsequently evaluated as well. The EF-Tu gene of Streptococcus suis is 1197 bp in length, encodes 398 amino acids. The target recombinant EF-Tu (rEF-Tu) protein can recognize the antiserum of Streptococcus suis and can provoke obvious humoral immune responses in rabbits and conferred protection to rabbits against Streptococcus suis ear-vein challenge, implying that the EF-Tu may be used as an attractive candidate antigen for a component of subunit vaccine.
Źródło:
Polish Journal of Veterinary Sciences; 2017, 20, 2
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transcriptomic analysis of different tissues in Korean arborvitae
Autorzy:
Mu, H.
Gao, Y.
Cheng, F.
Lin, L.
Wang, G.
Xia, F.
Powiązania:
https://bibliotekanauki.pl/articles/2077762.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
Thuja koraiensis
transcriptome
tissue specific
Opis:
Korean arborvitae (Thuja koraiensis) is an evergreen shrub or small tree native to Korea and the extreme Changbai Mountain of China threatened by habitat loss. Due to the limited genomic sources of Ko- rean arborvitae, it is important to explore transcriptome to understand this economically important plant. We used RNA-seq technology to characterize the transcriptome of root, stem and leaf in Korean arborvitae, respectively. Based on the bioinformatics analysis of assembled transcriptome data, transcriptional path- ways and differentially expressed genes (DEGs) were identified. There were 152.26 million reads generated, and 446,568 unigenes with a mean size of 423.51 nt obtained via de novo assembly. Of these, 204,091 unigenes (45.70%) were further annotated by comparison to public protein databases. A total of 63,495 unigenes (14.22%) were associated into 130 pathways by searching against the KEGG database. DEGs analysis identified 11,890, 5,900 and 10,136 DEGs from the comparison of root vs. stem, root vs. leaf and stem vs. leaf, respectively. Besides, photosynthesis, plant hormone signal transduction and metabolism and biosynthesis of sugar and amino acids were changed in different tissues. We obtained 446,568 unigenes in Korean arborvitae and 11,890, 5,900 and 10,136 DEGs from the compar- ison of root vs. stem, root vs. leaf and stem vs. leaf, respectively. These results will aid in understanding and carrying out future studies on the molecular basis of Korean arborvitae and contribute to future artificial production and applications.
Źródło:
Dendrobiology; 2019, 81; 31-39
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Factors regulating the compositions and distributions of dissolved organic matter in the estuaries of Jiaozhou Bay in North China
Autorzy:
Hu, J.
Zou, L.
Wang, J.
Ren, Q.
Xia, B.
Yu, G.
Powiązania:
https://bibliotekanauki.pl/articles/48070.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
organic matter
chromophoric dissolved organic matter
dissolved organic matter
particulate organic matter
total carbohydrate
amino acid
biogeochemical process
coastal environment
chlorophyll a
North China
Źródło:
Oceanologia; 2020, 62, 1
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effects of Epoxidized Acrylated Castor Oil (EACO) on Soft Poly (vinyl chloride) Films as a Main Plasticizer
Autorzy:
Song, F.
Xia, H.
Jia, P.
Zhang, M.
Hu, L.
Zhou, Y.
Powiązania:
https://bibliotekanauki.pl/articles/777906.pdf
Data publikacji:
2018
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Castor Oil
Poly(vinyl chloride)
Epoxy Plasticizer
Thermal Property
Migration Resistance
Opis:
In this work, an environmentally friendly type plasticizer was introduced. The synthesis consisted of two steps. In the first step, castor oil (CO) was acrylated and then the acrylated castor oil (ACO) was epoxidized with the presence of formic acid and hydrogen peroxide in the second step. The epoxidized acrylated castor oil (EACO) was characterized by FTIR and  1H-NMR techniques. The EACO was used as a main plasticizer to obtain plasticized PVC materials and compared with DOP. The results showed that EACO improved polyvinyl-chloride (PVC) plasticization performance and reduced Tg from 81.06°C to 1.40°C. Plasticized PVC materials with EACO showed similar mechanical properties and better thermal stability than DOP. EACO had better volatility stabilities, migration and solvent extraction in PVC than DOP. EACO can be used to replace DOP to prepare soft films.
Źródło:
Polish Journal of Chemical Technology; 2018, 20, 4; 13-19
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nondestructive Evaluation of Rubber Composites Using Terahertz Time Domain Spectroscopy
Niedestrukcyjna metoda oceny kompozytów kauczukowych przy użyciu spektroskopii z wykorzystaniem technologii wykrywania terahercowego
Autorzy:
Xu, F.
Duan Mu, Q. D.
Li, L. J.
Yang, D.
Xia, B.
Powiązania:
https://bibliotekanauki.pl/articles/232361.pdf
Data publikacji:
2018
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
terahertz imaging
rubber composites
nondestructive testing
defects
wykrywanie terahercowe
materiały gumowe
badania nieniszczące
defect gumy
Opis:
In recent years, with the progress of science, more and more detection methods are being used in various fields. However, the nondestructive testing of nonmetallic materials still needs further study. In this paper, an analysis of the time domain characteristics of rubber materials using terahertz detection technology was carried out, obtaining different defect rubber material spectral characteristics as well as imaging results and data. The results show that the THz spectrum imaging technique can detect the thickness of rubber material in the 0.1 ~ 4.0 terahertz band, and the image is clear and the resolution high. Meanwhile the time domain waveform obtained is sensitive to the debonding defects of the sample rubber, is suitable for judging the overall performance of the rubber inner defect detection, and can provide the scientific basis for rubber material performance.
W artykule przedstawiono analizę charakterystyk materiałów gumowych z wykorzystaniem technologii wykrywania terahercowego, uzyskując różne charakterystyki spektralne defektów gumy, a także wyniki i dane obrazowe. Wyniki pokazały, że technika obrazowania widma THz może wykrywać grubość materiału gumowego w paśmie 0,1 ~ 4,0 terahercowym, a obraz jest wyraźny i ma wysoka rozdzielczość. W międzyczasie otrzymany przebieg domeny czasu jest wrażliwy na defekty badanej gumy, jest odpowiedni do oceny ogólnej wydajności wykrywania wewnętrznego defektu gumy i może zapewnić podstawy dla oceny właściwości materiału gumowego.
Źródło:
Fibres & Textiles in Eastern Europe; 2018, 1 (127); 67-72
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simultaneous extraction of vanadium and chromium from vanadium slag using low-pressure liquid phase oxidation method
Autorzy:
Xia, J.-P.
Zheng, S.-L.
Wang, S.-N.
Liu, B.
Zou, X.
Powiązania:
https://bibliotekanauki.pl/articles/110818.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
vanadium slag
low pressure leaching
liquid phase oxidation
kinetics
Opis:
A low-pressure liquid oxidation method was proposed and proven to be effective to extract vanadium and chromium simultaneously from the vanadium slag in concentrated NaOH aqueous solutions. The effect of temperature, NaOH mass concentration, liquid-to-solid mass ratio, stirring speed and pressure on the extraction of vanadium and chromium in NaOH aqueous solutions were systematically investigated. Under the optimal reaction conditions (temperature of 473 K, liquid-to-solid mass ratio of 6:1, stirring speed of 700 rpm, NaOH mass concentration of 50%, pressure of 1 MPa and reaction time of 180 min), the vanadium and chromium recovery reached 95% and 90%, respectively. It was found that the reaction temperature and NaOH concentration were important factors for the extraction of vanadium and chromium. The kinetics of the decomposition of vanadium slag in concentrated NaOH aqueous under low pressure was analyzed using the shrinking core model, and the results indicated that the extraction of vanadium and chromium were both governed by the internal diffusion step, with apparent activation energies calculated to be 26.22 and 32.79 kJ/mol, respectively.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 2; 609-619
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 18

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