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In order to partially replace jute sound absorption material, sound absorption performance and influencing factors of the palm kapok fiber felt/poly (3 hydroxybutyrate-valerate (PHBV) hot pressed composite material were studied. The effcts of palm fiber, kapok fiber and PHBV mass ratio, fiber felt surface density, palm fiber linear density, the thickness of the composite material on the average sound absorption coefficient at low frequency (200 Hz-1 600 Hz) were analyzed. The results showed that the 2 pieces of fiber felt was adopted and the mass ratio of palm, kapok, PHBV was 10:30:60, surface density of the fiber felt was 185 g/m2 and 145 g/m2 respectively, linear density of kapok fiber was 0.25 tex, linear density of palm fiber was 0.60 tex, thickness of hot pressed composite materials was 4 mm, the average low frequency sound absorption coefficient of hot pressed composite material was 0.42, which could be used as absorption material in actual operation. [ABSTRACT FROM AUTHOR]

Copyright of Food & Machinery is the property of Food & Machinery Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Remote Sensing is the property of Editorial Office of Journal of Remote Sensing & Science Publishing Co. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Based on the local resonance and pipe silencing theories, an acoustic metamaterial structure with variable cross-section Helmholtz cavity was designed. The acoustic properties of the metamaterials were investigated by COMSOL simulation software. The effect of the geometric parameters of the acoustic metamaterial with variable cross-section on the coefficient peak was discussed, and the acoustic properties were determined by acoustic experiments. The results show that the acoustic structure with variable cross-section structure can realize satisfactory sound absorption effect in the low frequency range of 200-600 Hz. Changing the cross-sectional gradient of pipe holes can realize the directional adjustment of the natural frequency of acoustic structure. Compared with ordinary Helmholtz resonator, the sound absorption coefficient peak of the proposed acoustic structure can move within a certain low frequency range, and the sound absorption effect is improved in the low frequency range with widened frequency range corresponding to the sound absorption coefficient. The geometric parameters of the acoustic metamaterial structure are optimized with good sound absorption effect. [ABSTRACT FROM AUTHOR]

[Objective]The cultivation of talents with the theoretical knowledge and practical ability of carbon neutrality is urgent for mitigating climate change and achieving a goal of carbon neutrality. Protecting and increasing the carbon sink in ecosystems represents an important pathway to carbon neutrality. The dissolved organic matter (DOM) in aquatic environments contains a large carbon pool; thus, studying the biodegrad ability of bulk DOM and the transformation of different DOM components is crucial. This study designed a comprehensive experiment to analyze the carbon sink potential of aquatic DOM, combining research frontiers and experiment teaching. [Methods]This experiment included the sampling of DOM from typical water bodies and laboratory biodegradation incubation. The river water and wastewater were collected as typical samples, and the DOM was measured before and after the microbial degradation. The dissolved organic carbon (DOC) concentration was measured using a total organic carbon analyzer to quantify the biodegrad ability of bulk DOM. A UV--visible absorption spectrometer and a molecular fluorescence spectrometer were used to further measure the optical properties of DOM. The absorption coefficient and the spectral slope were calculated as indicators of the level of chromophoric DOM (CDOM) and the average molecular weight of DOM, respectively. Humic-like and protein-like peaks were identified from the fluorescence spectra, and the fluorescence intensity of each peak was used to indicate the level of the corresponding fluorescent component. The absorption and fluorescence indices of the initial and degraded samples were compared to decipher the degradation and transformation characteristics of CDOM and different types of fluorescent components. [Results]The bulk DOC decreased by 15.7% and 45.0% after the microbial degradation of river and wastewater DOM, respectively. This indicated the higher biodegrad ability of DOC from wastewater that contained more labile constituents. In contrast, the river DOC contained a higher percent of refractory constituents and thus had a higher carbon sink potential. The CDOM absorption coefficient decreased by 12.8% and 1.5% in the river water and wastewater after biodegradation, respectively. The weaker decrease in wastewater CDOM suggested the potential transformation from labile constituents to CDOM by microbial humification. The absorption spectral slope increased slightly by 4.9% after the biodegradation of the river sample due to the decreased molecular weight by the prevailing degradation process. In contrast, the spectral slope decreased by 19.8% for the wastewater sample, indicating an increase in the molecular weight through microbial humification. The fluorescence of river DOM was dominated by humic-like peaks, whereas that of wastewater showed strong signals for both humic-like and protein-like peaks. The protein-like peaks showed little changes in the river water while the humic-like peaks increased slightly, which indicated net accumulations of refractory components and was consistent with the theory of microbial carbon pump. In contrast, both protein-like and humic-like peaks decreased after the degradation of the wastewater sample, which proved a higher biodegradability and the potential priming effect due to the increased microbial activity with more labile substrates. [Conclusions]This experiment revealed different biodegrad abilities of bulk DOM and different DOM constituents (CDOM and different fluorescent components) from typical aquatic environments (i.e., river and wastewater). The experiment design can be applied to further explore the biodegrad ability of DOM from other water bodies. The results can be used for assessing the carbon sink potential of environmental DOM and for analyzing its underlying mechanisms. This experiment can help students understand the cutting-edge scientific theory of carbon neutrality, master the principle, operation, and data analysis of modern instrumental analysis techniques, and cultivate innovative thinking and practical ability, which will help the cultivation of talents for carbon neutrality. [ABSTRACT FROM AUTHOR]

In this paper, phosphogypsum-based polymer foam lightweight soil was prepared by taking phosphogypsum as fine aggregate and adding coagulant and prefabricated foam. The changes in the properties of the material were studied deeply in terms of flow rate, setting time, mechanical properties, water absorption and softening coefficient, combined with XRD and SEM for microscopic testing. The results show that mortar test blocks with excellent performance can be prepared under the conditions of sand-to-ash ratio 0.6, water-to-material ratio 0.5 and quicklime 4%. The initial and final setting times are 210 and 260 minutes, the compressive strength of the specimen can reach 2.8 MPa after 3 days, and 11.9 MPa after 28 days. Foam lightweight soil with different wet density can be prepared by adjusting the amount of prefabricated foam, providing a new way for phosphogypsum resource application. [ABSTRACT FROM AUTHOR]

In this study, the Cr2+ :CdSe and Fe2+ :CdSe crystals were successfully grown by the Mo-crucible sealed Bridgman method using a vacuum single-crystal furnace with two zones developed by ourselves, and the crystal size reaches φ51 mm x 110 mm. Cr2+ :CdSe and Fe2+ :CdSe crystals demonstrate obvious absorption in the bands of 1 400 ~ 2 400 nm and 2 500 ~5 200 nm, respectively. The transmittances of Cr2+/Fe2+ doped CdSe crystals are close to the transmittance limit of CdSe crystal (~70%) in the 7 ~ 15 μm band, and the converted absorption coefficient is about 0.005 cm-1. The Cr2+/Fe2+ : CdSe crystals grown by the Mo-crucible sealed Bridgman method have the advantages of the controllable doping concentration of transition metal ions, uniform doping and high crystal quality. The Cr2+/Fe2+ : CdSe crystals could be used as both midinfrared laser crystal and far-infrared nonlinear optical crystal material. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Test & Measurement Technology is the property of Publishing Center of North University of China and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In this paper, a series of ITO thin films with different concentrations of metal Sn doping were prepared by electron beam evaporation technique. X-ray diffractometer, atomic force microscope, UV-Vis-NIR spectrophotometer, four-probe resistivity meter and Z-scan system were used to measure and characterize the physical phase structure, microscopic morphology, optical absorption, square resistance and nonlinear optical properties of ITO films, respectively. The test results show that, with the increase of metal Sn doping concentration from 10% to 30%: the crystalline quality of the ITO film is enhanced; the surface roughness of the film increases and the grain size gradually increases; the plasma absorption is enhanced and the position of the absorption peak is red-shifted and the optical band gap is narrowed; the square resistance of the film continuously reduces; the nonlinear absorption coefficient gradually increases, and the maximum absolute value can be increased to 2.59 × 10-7 cm/ W. The finite-difference fitting results in the time domain show that the variation pattern of electric field intensity of ITO thin film samples with different metal Sn doping concentrations is consistent with the experimental results. [ABSTRACT FROM AUTHOR]

Lithium terbium fluoride (LTF) crystal is a good kind of magneto-optical material with high Verdet constant and low absorption coefficient, which is suitable to be used in magnetic-optical devices for high-power and large energy laser systems. In this paper, large size and high optical quality LTF crystal with a diameter of 2 inch was prepared by resistance heating Czochralski method, under the conditions of a protective atmosphere mixed with Ar and CF4. During this process, high-purity TbF3 and LiF were adopted as the raw materials. The optical properties of the LTF crystal were analyzed in detail. This crystal boule exhibits a complete appearance, good optical uniformity, and low residual stress, with no visible scattering particles under He-Ne laser irradiation. The LTF crystal elements with a diameter of 10 mm were processed from this boule. The parameters of the crystal elements such as the single-pass loss coefficient, extinction ratio, wavefront distortion, and weak absorption coefficient were tested. The results show that the grown LTF crystal have good optical quality. The magneto-optical performance of the LTF crystal was also researched, and its Verdet constant is about 98% of that of the commercial TGG crystals. [ABSTRACT FROM AUTHOR]

Nd∶CaYAlO4 single crystal fibers with different atom number fraction (0. 25%, 0. 50%, 0. 75%, 1. 00%) were grown by the micro-pull-down method. The crystal structure of the single crystal fiber was tested by X-ray diffraction (XRD), and the results show that the crystal structure is tetragonal. The polarization absorption and fluorescence spectra of Nd∶CaYAlO4 single crystal fibers were tested at room temperature, and the samples have strong absorption near 807 nm. Among them, the absorption of 1. 00% Nd∶CaYAlO4 absorption is the strongest, and the absorption coefficients for σ and π polarization are 4. 20 and 4. 06 cm-1, respectively. The strongest emission peaks of 1. 00% Nd∶CaYAlO4 single crystal fiber are at 1 080 nm in both σ and π polarization. The emission bandwidths are 17. 7 and 17. 8 nm for σ and π polarization, respectively. The fluorescence lifetime of 0. 25%, 0. 50%, 0. 75% and 1. 00% Nd∶CaYAlO4 single crystal fibers are 129, 133, 135 and 140 μs, respectively, and no concentration quenching is observed. The results show that Nd∶CaYAlO4 single crystal fiber is a potential gain medium for ultrafast lasers. [ABSTRACT FROM AUTHOR]

Zinc telluride (ZnTe) nonlinear crystal, a commonly used electro-optical material, can be used to generate and detect Terahertz (THz) wave, and has been widely used in the fields of THz wave detection and imaging. However, the preparation of ZnTe crystal with high quality and large size still remains a challenge. In this paper, ZnTe single crystal rod with diameter of 40 mm and length of 140 mm was successfully prepared by the pressure assisted vertical Bridgman method. The crystal structure, crystalline quality, optical and electrical properties of ZnTe crystal were characterized and analyzed. The effects of annealing process of ZnTe crystal on the crystal's properties related to Te inclusions were investigated. According to the research results, after annealed at 850 ℃ for 200 h under Zn atmosphere, the transmittance of the crystal in the visiblenear infrared wave band reaches up to 62%, the resistivity of the crystal is 104 Ω·cm, and the absorption coefficient is from 5 cm-1 to 15 cm-1 at the range from 0. 2 THz to 2 THz. The results provide a valuable reference for the preparation of highquality ZnTe crystal. [ABSTRACT FROM AUTHOR]

Er3 + ,Yb3 + ∶Ba3Gd(PO4)3 crystals with different atomic fractions of Er3 + and Yb3 +, i.e. 1.85%Er,23.95%Yb∶Ba3Gd(PO4)3 and 1. 95%Er,55. 73%Yb∶Ba3 Gd(PO4)3 were successfully grown by the Czochralski method. Room-temperature absorption coefficient spectra, up-conversion fluorescence spectra, emission cross-section spectra, gain cross-section spectra and fluorscence decay curves of the crystals were measured and analyzed. Emission cross-section at peak fluorescence wavelength of 1 537 nm, fluorescence lifetime of the 4 I13/2 multiplet of Er3 + and Yb3 + →Er3 + energy transfer efficienecy of the 1. 85%Er, 23. 95%Yb∶Ba3 Gd(PO4)3 crystal are 0. 54 × 10 -20 cm2, 9. 9 ms and 90%, respectively, while the above values of the 1. 95%Er,55. 73%Yb∶Ba3 Gd(PO4)3 crystal are 0. 58 ×10 -20 cm2, 9. 7 ms and 93%, respectively. End-pumped by 975 nm laser diode, 1 567 nm continuous-wave laser with maximum output power of 97 mW and slope efficiency of 27.1% is obtained in the 1.85%Er,23.95%Yb∶Ba3 Gd(PO4)3 crystal, while 1 567 nm continuous-wave laser with maximum output power of 93 mW and slope efficiency of 17.1% is obtained in the 1.95%Er,55.73%Yb∶Ba3 Gd(PO4)3 crystal. [ABSTRACT FROM AUTHOR]

Copyright of Bulletin of the Chinese Ceramic Society is the property of Bulletin of the Chinese Ceramic Society Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Plastics Science & Technology / Suliao Ke-Ji is the property of Plastics Science & Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Nowadays, with the rapid development of electronic information technology, solar-blind ultraviolet (UV) detectors having large anti-interference ability and higher sensitivity are attracting much attention. Possessing ultra-wide band gap, high optical absorption coefficient, good thermal conductivity, and high breakdown field strength, hexagonal boron nitride (h-BN) has become a promising material for solar-blind UV detectors. Additionally, high mechanical strength and optical transparency of h-BN make it a potential candidate for flexible detector. However, the h-BN films prepared at low temperatures often contain many defects, which greatly limit their performance as a detector. In this work, high-quality h-BN films were prepared on sapphire and Si substrates using B as growth source at room temperature by reactive magnetron sputtering method, and then a high-performance solar-blind UV detector was fabricated based on h-BN films. The prepared h-BN solar-blind UV detector has extremely low dark current (0. 07 pA), high responsivity (1. 37 μA/ W) and detectivity (2. 73 × 10 10 Jones) at 3 V. These results indicate that preparation of high-quality h-BN film and its solar-blind UV detector at room temperature are feasible. The study also provides a reference for the application of h-BN detector working at room temperature. [ABSTRACT FROM AUTHOR]

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Copyright of Shipin Kexue/ Food Science is the property of Food Science Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Bulletin of the Chinese Ceramic Society is the property of Bulletin of the Chinese Ceramic Society Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Bulletin of the Chinese Ceramic Society is the property of Bulletin of the Chinese Ceramic Society Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Aiming at the problem of optical parameter estimation for semitransparent media， an inversion model for optical parameters of semitransparent media exposed to pulse laser irradiation is established. The quantum particle swarm optimization (QPSO) algorithm is adopted to estimate the refractive index and absorption coefficient. The effects of measurement error and thermophysical parameters on the inversion results are analyzed. The relationship between the inversion accuracy and measurement error is revealed by sensitivity analysis. The calculation results show that the established inversion model and the QPSO algorithm can accurately estimate the refractive index and absorption coefficient. Even with measurement error of 10%， the retrieval results still have strong robustness and high accuracy. This study can provide technical reference for obtaining the physical parameters of semitransparent media. [ABSTRACT FROM AUTHOR]

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Since the discovery of graphene, various two-dimensional materials with novel properties have attracted more and more attention. Janus two-dimensional materials have asymmetric surface properties. These special structures often have peculiar electrical, magnetic and optical properties, which have become a research hotspot in the field of material science in recent years. In this paper, the structures of Janus two-dimensional materials CrXX'(X/X'= S,Se,Te)(CrSSe, CrSTe, CrSeTe) were built, their electronic, magnetic, optical properties were studied, and the effect of biaxial strain on above properties was studied. In terms of electronic structure, the results show that CrSSe, CrSTe and CrSeTe are metallic and excellent conductors of electrons. Biaxial strain does not change their metallicity, which means their electronic structure has good robustness. In terms of magnetic properties, due to the contribution of unpaired electrons in the 3d orbital of Cr atom, CrXX'(X/X' = S,Se,Te) have long range magnetic ordering. By applying tensile strain, their magnetic moments increase, and by applying compressive strain, their magnetic moments decrease. In addition, CrXX'(X/X' = S,Se,Te) have higher Curie temperature. The Curie temperature of CrSSe is 165 K, that of CrSeTe is 195 K, and that of CrSTe is 310 K, which is above the room temperature. For optical properties, the results show that CrXX'(X/X' = S,Se,Te) have excellent absorption capacity of visible and ultraviolet light, which is about 50% higher than that of typical light absorption material graphene. Their light absorption coefficients can be adjusted by applying strain, compressive strain and tensile strain can move the absorption spectrum to short wave and long wave respectively. In conclusion, this work provides theoretical guidance for the further study of the application of two-dimensional monolayer CrXX' (X/X' = S,Se,Te) in the field of new room temperature spintronic devices. [ABSTRACT FROM AUTHOR]

In order to accurately measure the 3D temperature distribution of solid rocket motor plume, a radiation temperature measurement model of solid rocket engine plume was established. Aiming at the problems of low accuracy and poor robustness of reconstruction algorithm in current radiometric temperature measurement technoiogy, a reconstruction method of solid plume three-dimensional temperature field based on LM-GAUSS hybrid algorithm was proposed. The effects of radiation intensity noise, absorption coefficient noise, different noise levels and meshing method were studied by numerical simulation. Compared with the simulation results of traditional LSQR and NNLS reconstruction algorithms, the simulation results show that the reconstruction accuracy of the algorithm is better than 5%o when the noise is less than 10%, which proves the performance of the proposed hybrid algorithm with high reconstruction accuracy and strong robustness. The 3D temperature field reconstruction experiment of ethylene flame was carried out in the laboratory, which proved the applicability of LM-GAUSS and provided the support for the foliow-up field measurement of solid engine plume temperature. [ABSTRACT FROM AUTHOR]

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Through analysis methods such as strength, water absorption, softening coefficient and scanning electron microscope (SEM).the effect of slag-water glass on the solidification performance of loess was studied. The test results show that the gel produced by the slag stimulated by sodium silicate can be fully filled in the loess framework and cement the loess particles, reducing the internal overhead structure and voids, making the overall structure of the material compact, reducing water absorption, and enhancing water resistance. When the water glass content is 35%, the prepared solidified loess material is better shaped, and it is not easy to produce bubbles, cracks and other defects. Comprehensive data analysis results show that compressive strength of the solidified loess material increases with the increase of the slag content, and it first increases and then decreases with the water glass modulus. When the water glass modulus is equal to 1.8,and the content is 35%, the slag content is greater than 50%, the 28d compressive strength, softening coefficient and water absorption of the prepared slag-water glass composite loess material are 29.95 MPa,0.94 and 7.2%,respectively. It can replace ordinary Portland cement concrete for slope protection, roadbed filling and other practical projects. [ABSTRACT FROM AUTHOR]

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There are some adverse reactions in dye-sensitized solar cells (DSSC), such as dye relaxation, electrons in semiconductor films react with oxidized dye molecules and electron recombination with oxidized ions in electrolyte. It is very important to use a more sophisticated DSSC carrier transport model to simulate the photoelectric performance of the battery. Therefore, this paper is based on the carrier transport model including electron, dye cation, iodide and triiodide in DSSC established by multiple capture theory. The J-V curves of DSSC with different TiO2 film thickness, different incident light intensity and different dye molecular absorption coefficient were obtained by numerical simulation. The results show that with the increase of TiO2 film thickness, the short-circuit current density of solar cells increases, the open circuit voltage decreases, and the photoelectric conversion efficiency first increases and then decreases. When the TiO2 film thickness of DSSC is 20 μm, the photoelectric conversion efficiency reaches the maximum value of 7. 41%. At the same time, the photoelectric conversion efficiency increases with the increase of incident light intensity and dye molecular absorption coefficient. When the absorption coefficient is 4 500 cm-1, the photoelectric conversion efficiency is 6. 73%. The above analysis and research results can provide theoretical guidance for improving the photoelectric performance of DSSC. [ABSTRACT FROM AUTHOR]

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Two-dimensional layered materials represented by MoS2 and GeS exhibit excellent physical properties in optical and electrical aspects. How to combine the excellent properties of the two materials and obtain composite materials with new synergistic functions are of great significance to the development and application of electronic devices. This work uses the first principles calculation method of density functional theory to systematically study the electronic structures and optical properties of GeS / MoS2 heterojunctions, at the same time, the influence of interface distance, strain and electric field on the electronic structures and the optical properties of the heterojunctions was also explored. The research results show that the GeS / MoS2 heterojunctions is a type Ⅱ band arrangement, which is conducive to the separation of photogenerated electron-hole pairs. Further research found that the band arrangement and light absorption coefficient of GeS / MoS2 heterojunctions can be effectively controlled by means of strain and electric field. The research results show that GeS / MoS2 heterojunctions has potential applications in photocatalysis, optoelectronic devices and other fields, and the research in this paper provides theoretical guidance for the design and preparation of GeS / MoS2 related optoelectronic devices. [ABSTRACT FROM AUTHOR]

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[Objectives]The aim of this study was to screen nitrogen efficient varieties from different cut chrysanthemum variety resources and construct an assessment system of nitrogen efficient chrysanthemum at seedling stage. [Methods]The physiological and nitrogen efficiency indexes of 28 cut chrysanthemum varieties at seedling stage under high nitrogen level (pure nitrogen 266.67 mg per plant), normal nitrogen level(pure nitrogen 133.33 mg per plant)and low nitrogen level(pure nitrogen 16.67 mg per plant)were measured. The variation coefficient, correlation analysis, principal component analysis and subordinate function analysis were used to screen the nitrogen efficient varieties of cut chrysanthemum, determine the optimum nitrogen level and the evaluation indexes for screening of nitrogen efficient varieties at seedling stage. [Results]Under high nitrogen level, the variation coefficient of nitrogen absorption efficiency and nitrogen utilization efficiency of plant were lower than those of normal and low nitrogen level. Under low nitrogen level, the variation coefficient of growth indexes and nitrogen efficiency indexes of cut chrysanthemum at seedling stage was larger, and the variation coefficient of nitrogen absorption efficiency was the largest, from 57.17%-63.09%. After different nitrogen levels, there was a significant positive correlation among the indexes of stem diameter, leaf fresh weight, stem fresh weight, leaf dry weight, stem dry weight, leaf nitrogen absorption efficiency and stem nitrogen absorption efficiency of cut chrysanthemum(P<0.01),which showed higher load in principal component 1. According to the statistics scores of 28 cut chrysanthemum varieties under different nitrogen levels, there were 5 varieties such as‘Nannongzifeng'‘Nannongxuefeng'‘Nannongdanjincui'‘Nannongdaihua'and‘Nannonglüyi'which showed lower scores, while 5 varieties such as‘Nannonglihuang'‘Nannongxiaojinmao'‘Nannongfengshou'‘Nannongxuri'and‘Nannongluyue'showed higher scores. Five nitrogen efficient varieties had significant superiority in plant height, stem diameter, aboveground fresh weight, aboveground dry weight, nitrogen uptake efficiency of aboveground and nitrogen content indexes under different nitrogen levels. Under low nitrogen level, the indexes of root fresh weight, root dry weight, root nitrogen uptake efficiency and root nitrogen content of the 5 nitrogen efficient varieties were significantly higher than those of nitrogen inefficient varieties(P<0.05). [Conclusions]At seedling stage, low nitrogen level was more suitable for screening nitrogen efficient cut chrysanthemum varieties, and the nitrogen use efficiency of cut chrysanthemum was mainly determined by the nitrogen absorption efficiency. In this study,‘Nannonglihuang'‘Nannongxiaojinmao'‘Nannongfengshou'‘Nannongxuri'and‘Nannongluyue'were selected as 5 nitrogen efficient varieties, which would provide an elite variety reserve for nitrogen efficient chrysanthemum breeding in the future. [ABSTRACT FROM AUTHOR]

Copyright of Shipin Kexue/ Food Science is the property of Food Science Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Agro-Environment Science is the property of Journal of Agro-Environment Science Editorial Board and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Shipin Kexue/ Food Science is the property of Food Science Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Coal Science & Technology (0253-2336) is the property of Coal Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Henan Agricultural Sciences is the property of Editorial Board of Journal of Henan Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to study the influence of the surface structure of fullbore porous glass on its sound absorption properties, the surface was punched twice, the influence of surface structure parameters on the sound absorption properties of full-bore porous glass was analyzed by orthogonal test. the best structural parameters of the sound absorption sample was obtained. The results show that the change of the surface structure of the porous material has a great influence on the sound absorption property, but has little effect on the initial frequency. The factors affecting the sound absorption properties of porous glass materials are material thickness, porosity, hole diameter and hole depth. The best design parameters of the porous glass areas follows: the porosity is 0.76, the thickness 20m, the hole depth 0.5 times the thickness of the sample, and the pore diameter 2.2mm. At this time, the average sound absorption coefficient of porous glass is as high as 0.82, an increase of 24.6%. [ABSTRACT FROM AUTHOR]

Copyright of Chinese Journal of Liquid Crystal & Displays is the property of Chinese Journal of Liquid Crystal & Displays and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to solve the problems of color matching system in the current intelligent colored spun yarn incapable for dope dyeing on viscose fibers, 66 kinds of blended yarn were prepared with red, yellow and blue dope dyeing viscose fiber in digital rotor spinning frame with increment of 10%.Knitting sample fabrics were produced on a small circular knitting machine. Then Datacolor650 spectrophotometer was used to test the color and the testing results were recorded. Finally, based on the Kubelka-Munk double-constant theory color matching model, the test results were analyzed and calculated. The color matching model was established and its accuracy was verified. The results showed that the color matching model established with absorption coefficient K value and scattering coefficient S value calculated by the least square method was more accurate. The error between predicted value and practical value of the samples was only 0.097 9.The average color differences was only 0.465.There is no significant difference between the predicted color and the actual color. [ABSTRACT FROM AUTHOR]

Copyright of Shipin Kexue/ Food Science is the property of Food Science Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)