Hunan Forestry Academy

Changsha, China

Hunan Forestry Academy

Changsha, China
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Fan Y.,Central South University | Fan Y.,Hunan Forestry Academy | Li C.,Hunan Forestry Academy | Chen Z.,Hunan Forestry Academy | Chen H.,Central South University of forestry and Technology
Applied Surface Science | Year: 2012

In the present study, superhydrophobic copper wafer was prepared by a sol-gel deposition method. Different molar ratios of vinyltrimethoxysilane (VTES), ethanol (EtOH), water (H 2O) and ammonia water (NH 3·OH) were involved in this research. The morphologies, chemical compositions and hydrophobicity of the films were analyzed by scanning electron microscopy (SEM), energy dispersive X-ray detector (EDX), Fourier transfer infrared spectrometer (FTIR) and water contact angle measurement (CA). It was shown by the surface morphological study that different structures, such as pyramid-shaped protrusions, nipple-shaped protrusions or ball-shaped silica particles, were distributed on the copper substrate. The films had a high water contact angle larger than 155.4°. The durability properties revealed that the films had a good superhydrophobicity deposited in 3.5 wt.% sodium chloride solution for up to 14 days. © 2012 Elsevier B.V.


Fan Y.,Central South University | Fan Y.,Hunan Forestry Academy | Chen Z.,Hunan Forestry Academy | Liang J.,Central South University | And 2 more authors.
Surface and Coatings Technology | Year: 2014

The carambola-like CuO film on copper substrate was hydrothermally synthesized using copper acetate and hexamethylenetetramine solutions at 90. °C. The CuO particles, which were composed of nanopetals with a thickness of 80 to 120. nm, had a shape similar to a carambola of 600. nm in width and 800. nm in lengths. The CuO film was endowed with superhydrophobic property by modifying with stearic acid (STA), which was referred to the STA-modified CuO film. The morphologies and chemical composition of the CuO film were characterized by scanning electron microscopy (SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS) and means of water contact angle (WCA). The WCA of the STA-modified CuO film was measured to be as high as 157°. The corrosion resistance ability and durance property of the STA-modified CuO film in a 3.5. wt.% sodium chloride solution was evaluated by electrochemical impedance spectroscopy (EIS). Moreover, the anticorrosion properties of the STA-modified CuO film were compared with the unmodified pure copper substrate. © 2014 Elsevier B.V.


Youhua F.,Central South University | Youhua F.,Hunan Forestry Academy | Changzhu L.,Hunan Forestry Academy | Zejun C.,Hunan Forestry Academy | Hong C.,Central South University of forestry and Technology
Advanced Materials Research | Year: 2012

Superhydrophobic copper wafer was prepared using a sol-gel deposition method in the paper. The best superhydrophobic film was prepared with vinyltrimethoxysilane (VTES), ethanol (EtOH), water (H 2O) and ammonium hydroxide (NH 4OH) at a molar ratio of 1:62.79:8.58:1.49 respectively. The morphologies, chemical compositions and hydrophobicity of the substrates were analyzed by scanning electron microscopy (SEM), energy dispersive X-ray detector (EDX) and water contact angle measurement (CA). The surface morphological study showed that "lotus like structure" silica particles distributed on the copper substrate. The coatings showed the CA as high as 157.8°. The durability properties revealed that the coatings had a good superhydrophobicity deposited in 3.5 wt % sodium chloride solution for up to 14 days. © (2012) Trans Tech Publications, Switzerland.


Fan Y.H.,Central South University | Fan Y.H.,Hunan Forestry Academy | Chen Z.J.,Hunan Forestry Academy | Deng L.Y.,Hunan Forestry Academy | Chen H.,Central South University of forestry and Technology
Advanced Materials Research | Year: 2014

A superhydrophobic copper oxygen (CuO) surface with hierarchical micro- and nanostructure was obtained by hydrothermally synthesized. The CuO surface was endowed with superhydrophobic property by modifying with stearic acid, which was referred to the STA-modified CuO film. The surface morphological study showed that different structures, such as petal-shaped, bulk-shaped, carambola-shaped CuO and cauliflower-shaped particles distributed on the copper substrate under the different synthesis conditions. The water contact angle and sliding angle of the as-prepared CuO surface were 157 ± 2.3° and 3°, respectively. © (2014) Trans Tech Publications, Switzerland.


Fan Y.,Central South University | Fan Y.,Hunan Forestry Academy | Li C.,Hunan Forestry Academy | Chen Z.,Hunan Forestry Academy | And 2 more authors.
Surface and Coatings Technology | Year: 2012

Superhydrophobic and superparamagnetic magnetite/silica composite was prepared by combining of the organic and inorganic materials in the present work. The resulting products were characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transfer infrared spectrometer (FTIR), Thermal Gravity Analysis (TG) and water contact angle measurement (CA), respectively. The morphologies of the composite were spherical particles with diameters from 40 to 80nm seen from SEM. The results from FTIR and TG indicated that 2,2,3,4,4,4-hexafluorobutyl acrylate (HFBA) had grafted onto vinyl-terminated Fe3O4 nanoparticles via covalent bonds. Surface wetting properties of the P (HFBA)-g-Fe3O4@MPS nanoparticles were evaluated by measuring water contact angle, which were measured to be 154.6°. Moreover, based on the magnetism analysis of the resulting products, they had superparamagnetic property. The double functional repairable coatings enlarged potential applications of the superhydrophobic surfaces. © 2012 Elsevier B.V.


Zhang S.,Chinese Academy of Forestry | Zhang Z.,Chinese Academy of Forestry | Kong X.,Chinese Academy of Forestry | Wang H.,Chinese Academy of Forestry | And 2 more authors.
Microscopy Research and Technique | Year: 2012

In this article, we described the ultrastructure of the sensilla on the antenna, eyes, mouthparts, wings, legs, and external genitalia of female and male Trichogramma dendrolimi using scanning electron microscopy (SEM). The antenna possessed the most sensilla types. We found 13 types of sensilla on female antenna, which were trichoid sensilla (TS) type 1-4, chaetica sensilla (ChS) type 1-2, campaniform sensilla (CaS), falcate sensilla, placoid sensilla (PS) type 1-2, basiconic capitate peg sensilla (BCPS) type 1, coeloconic sensilla (CoS), and styloconic sensilla. Ten types of sensilla were found on the male antenna, some were the same as that on female T. dendrolimi antenna, such as TS types 1 and 3, CaS, PS type 1, BCPS type 1, and CoS, but TS types 5 and 6, ChS type 3, and BCPS 2 were specific to male T. dendrolimi antenna. The leg possesses eight types of sensilla and a kind of tympana structure. Four types of TSs were found on the wings. On the mouthparts, sensilla on the maxillary and labial palps were unique, including two TSs and one ChS. The ovipositor possesses three types of sensilla, and the copulatory organ possesses two types. The eyes had only one kind of TS. Furthermore, external morphology of antenna and external genitalia revealed distinct sexual dimorphisms. According to their morphology, the possible functions of these sensilla were discussed. These results may further our understanding of the sensory mechanisms of T. dendrolimi in response to infochemicals within the environment. © 2012 Wiley Periodicals, Inc.


Tong F.,Hunan Forestry Academy | Li G.,Hunan Forestry Academy | Yang W.,Forestry Bureau of Lengshuijiang City | Shi W.,Forestry Bureau of Lengshuijiang City | Liu Z.,Forestry Bureau of Lengshuijiang City
Journal of Food, Agriculture and Environment | Year: 2012

The experiment of artificial afforestation combining with soil amendment was carried out to investigate the effects of soil amendment on antimony (Sb) chemical forms, and its bioavailability in Chinese antimony mining. This research provides the technical basis for ecological remediation of Sb contaminated soils. The results showed that the soil pH values increased with the increasing of discharging amount of soil amendment. While using 300 g soil amendment on each plant, the soil pH value changed from acidic to alkaline. Soil amendment had significant effect in 0-20 and 40-60 cm soil layers on carbonate-bound Sb and had very significant effect in 20-40 cm soil layer, and very significant effect on residual form in 40-60 cm. The FeMn oxide-and organic-bound and residual forms mainly exist in 0-20 cm and 20-40 cm depth of soils in antimony mining. However, organic-and FeMn oxide-bound Sb exist in 40-60 cm depth of soil. The amendment addition increased Sb bioavailability by 18.92-24.23%, and decreased Sb potential bioavailability and Sb non-bioavailability by 17.55-18.92% and 0.95-6.03%, respectively.


Yang Y.-L.,Chinese Academy of Forestry | Yang Z.-Q.,Chinese Academy of Forestry | Wang X.-Y.,Chinese Academy of Forestry | Yu J.-X.,Hunan Forestry Academy | Yan X.-W.,Hunan Forestry Academy
Forest Research | Year: 2013

Sclerodermus sp. (Hymenoptera: Bethylidae) is one of the few known natural enemies of pine sawyer, Monochamus alternatus (Coleoptera: Cerambycidae). An experiment was carried out on controlling the larva of M. alternatus by using a parasitoid, Sclerodermus sp. The results are as follows. Laboratory experiment indicated that the parasitoid could kill 95.66% of the 1st instar larvae, 85.91% of the 2nd instar larvae, and 57.88% of the 3rd instar larva of pine sawyer by stinging and host-feeding (by predation). In addition, the bethylid could parasitize its host and complete a generation on the 2nd-3rd instar of its host larvae (by parasitism); the response of this parasitoid to its host, in field and indoor mesh, showed to be highly variable and unpredictable and between 2.3% and 14.9% of all parasitoids released and entered a target pine sawyer-infested cutlog. The parasitoid did not respond differently to aggregations of 1, 3, or 6 pine sawyer-infested cutlogs. However, the efficiency of Sclerodermus sp. released as carrying immature eggs of parasitized hosts was up to approximately five times higher than that when the parasitoid was released as carrying mature eggs. An individual parasitoid killed 2.1 to 7.7 pine sawyer larva by a combination of predation and parasitism on the average. The host-feeding characteristics of Sclerodermus sp. offer an important impact in the biological control for the use of this parasitoid.


Fan Y.,Hunan Forestry Academy | Wang Y.,Hunan Forestry Academy | Yu N.,Quality Supervision Test Center for Forest Products of Hunan | Deng L.,Hunan Forestry Academy | Chen Z.,Hunan Forestry Academy
Advances in Materials Science and Engineering | Year: 2016

In spite of some studies about the wood permeability and its improving measures, some progress has been made to study the diffusion and transmission of preservative solutions in standing trees. In the present study, copper- (Cu-) based preservative with other reagents is injected into the standing tree Chinese fir using sap-flow method. The chemical compositions of the retreated woods are analyzed with Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The samples from different height positions are analyzed with scanning electron microscope (SEM) and atomic absorption spectroscopy (AAS) to obtain microstructures and preservative retention, respectively. The results indicate that the preservative solutions with lower concentrations are more conducive to diffusion and transmission in the wood. Moreover, the preservative retention at different height position has a greater concentration gradient for composite preservative solutions than those of the single preservative solutions. Solidified preservative particles are observed in xylem rays with SEM. The results of the present study provide some useful information for the functional design of the target wood products. © 2016 Youhua Fan et al.


Lu M.,Beijing Forestry University | Zhang P.,Beijing Forestry University | Wang J.,Beijing Forestry University | Kang X.,Beijing Forestry University | And 3 more authors.
Plant Growth Regulation | Year: 2014

Triploid breeding has proven to be a valuable approach in Populus improvement. An ideal way to achieve triploid Populus is to cross diploids with tetraploids. In this study, we attempted to induce tetraploids of Populus adenopoda by inhibiting the first zygote division with high temperature exposure and increase the efficiency of tetraploid production. The relationship between zygote division stages and developmental changes of the cotton-like fiber in ovaries were analyzed, helping to guide the treatment towards the most accurate cytological stage. Among the 3,582 offspring, 32 teraploids were confirmed by both flow cytometric analysis and chromosome number counting. The highest efficacy of teraploid induction was 14.12 %. Significant differences between diploids and tetraploids were observed between the mean sizes and densities of leaf stoma. The tetraploid plants showed modified morphological characteristics, such as thicker leaves, modified leaf morphology, and stunted growth. Our finding showed that exposure during the first zygote division is an ideal method for teraploid induction in Populus. © 2013 Springer Science+Business Media Dordrecht.

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