Chinese︱Feedback︱Save this page

Login︱Register

• Elaborating Academic Views 　　　　 • Exchanging Innovative Ideas
• Protecting Intellectual Properties 　　• Fast Sharing Science Papers

Sponsored by the Center for Science and Technology Development of the Ministry of Education
Supervised by Ministry of Education of the People's Republic of China

Home > Papers > Forestry

There are 36 papers published in subject: since this site started.

Results per page:

36 Total, 4 Pages | << First < Previous 1 2 3 4 Next > Last >>

Select Subject

All (8828)

Agronomy (158)

Animal Husbandry,... (64)

Aquatic Science (16)

Astronomy (36)

Aviation (22)

Basic Medicine (184)

Biology (504)

Chemical Engineering (103)

Chemistry (635)

Civil and Archite... (105)

Clinical Medicine (236)

Computer Science ... (924)

Dynamic and Elect... (121)

Earth Science (119)

Economics (67)

Education (31)

Electrics, Commun... (927)

Energy Science an... (67)

Engineering and T... (15)

Environmental Sci... (140)

Food Science and ... (63)

Forestry (36)

Hydraulic Enginee... (40)

Mechanics (240)

Metallurgical Eng... (32)

Mine Engineering ... (38)

Nuclear Science a... (21)

Pharmacy (98)

Physics (920)

Preventive Medici... (37)

Psychology (20)

Security Science ... (17)

Sports Science (6)

Surveying and Map... (15)

Textile Science a... (16)

Traditional Chine... (56)

Transportation En... (57)

Second-level Subject

Basic Subject of Forestry(4)
Economic Forestry(2)
Forest Protection(1)
Forest Statistics(0)
Forest Tree Genetics and ...(1)
Forest?Management(3)
Forestry Economics(0)
Forestry Engineering(16)
Other Subjects of Forestry(1)
Protection Forestry(1)
Silviculture(1)
Wildlife Protection and M...(0)

Rank

Results per page:

36 Total, 4 Pages | << First < Previous 1 2 3 4 Next > Last >>

Alert Name:
Alerting to:
Authentication email will be sent to your email address in 24 hours
Frequency:
Email Message Format:	Plain text Graphical(HTML)

Complete the form below and we will recommend the selected titles to your friends on your behalf. * Indicates a required field.
Your name*:
Your email address*:
Recipient's name*:
Recipient's email address*:
(multiple recipient's names and email addresses should be separated with semicolons)
Your comments:	I thought you would find the page(s) useful.

Your name:
Your email address:
Recipient's name:
Recipient's email address:
(multiple recipient's names and email addresses should be separated with semicolons)
Your comments:	I thought you would find this page useful.

Disclaimer: This message was sent to your friend using the "Send it to a friend" facility on the Sciencepaper Online’ WWW site, http://www.paper.edu.cn/en. The Sciencepaper Online is not responsible for the content of this email, and anything said in this email does not necessarily reflect the Sciencepaper Online's views.


	1. Cellulose Esterification and Its Application to Films
	Zhiguo Wang,Yandan Zhou,Yiqin Yang
	Forestry 09 May 2014
	Show/Hide Abstract \| Cite this paper︱Full-text: PDF (0 B)

	Abstract:Homogeneous esterification of cellulose with octanoyl chloride (a long-chain fatty acid) was investigated in lithium chloride/N,N-dimethyl acetamide (LiCl/DMAc) medium. Cellulose was readily esterified by the octanoyl chloride, as shown by NMR analysis. The effects of the ratio of octanoyl chloride to cellulose hydroxyl groups, the reaction temperature, and the reaction time on the yield and degrees of substitution (DS) of cellulose esters (CEs) were investigated. CEs with high DS (2.2) were achieved after 8 h at 100 C with a 1.6 to 1.8 of molar ratio of octanoyl chloride to cellulose hydroxyl groups. Furthermore, hydrophobic, fully transparent CE films and aerogels were prepared using CE tetrahydrofuran (THF) solutions. The CE aerogels exhibited high porosity and were formed with evenly distributed porosity, as revealed by scanning electron microscopy (SEM).
	TO cite this article:Zhiguo Wang,Yandan Zhou,Yiqin Yang. Cellulose Esterification and Its Application to Films[OL].[ 9 May 2014] http://en.paper.edu.cn/en_releasepaper/content/4596712


	2. Calculation Method of MDF Continuous Press Quality Control Based on Burgers Model
	WANG Chunxiao,LIU Yaqiu,WU Qu
	Forestry 08 May 2014
	Show/Hide Abstract \| Cite this paper︱Full-text: PDF (0 B)

	Abstract:In this paper, to solve the problems such as bubbling and stratification on medium density fiberboard (MDF) in the processing and application, a quality control process based on MDF viscoelastic is proposed. Firstly, the creep compliance equation was deduced by studying the constitutive equation and the creep equation of viscoelastic Burgers model. Secondly, a tension and compression stiffness-creep compliance model based on the principle of dimensional homogeneous was built. And then after analyzing the servo-mechanisms and hydraulic loading system respectively, a model of the hydraulic position servo control system with pressure feedback was proposed by introducing the factors of pull-pressing rigidity and hydraulic rigidity. Finally, the slab hot-pressing control system with viscoelastic properties is simulated on the basis of the model of the hydraulic position servo control system with pressure feedback. The simulation results indicate that the precision of controlled object can be improved and the adverse effects brought by viscoelastic properties can be restrained through reasonable design of controller effectively.
	TO cite this article:WANG Chunxiao,LIU Yaqiu,WU Qu. Calculation Method of MDF Continuous Press Quality Control Based on Burgers Model[OL].[ 8 May 2014] http://en.paper.edu.cn/en_releasepaper/content/4596580

Saved Papers

Saved Papers


	3. Chemical Composition and Enzymatic Saccharification of Poplar
	MENG Xin,GENG Wenhui,JIN Yongcan
	Forestry 13 April 2014
	Show/Hide Abstract \| Cite this paper︱Full-text: PDF (0 B)

	Abstract:Green liquor (Na2S + Na2CO3, GL) pretreatment is an effective pathway for improving the enzymatic digestibility of lignocellulosic biomass for the production of bioethanol. In this work, GL was employed as a pretreatment to enhance the enzymatic saccharification of poplar. During pretreatment, the increase of H-factor and TTA charge resulted in enhanced delignification and increased degradation of polysaccharides. The sugar yield of enzymatic hydrolysis increased rapidly with increasing TTA charge in GL pretreatment, while the effect of different H-factors (from 400 to 800) on sugar yield was unnoticeable. The pretreated solid recovery was 75.5% at a lignin removal rate of 29.2% under optimized conditions of total titratable alkali (TTA) charge 20%, sulfidity 25%, and H-factor 400. The sugar yield of glucan, xylan, and total sugar of GL-pretreated poplar in enzymatic hydrolysis reached up to 89.9%, 65.5%, and 82.8%, respectively, at a cellulase loading of 40 FPU/g-cellulose.
	TO cite this article:MENG Xin,GENG Wenhui,JIN Yongcan. Chemical Composition and Enzymatic Saccharification of Poplar[J].


	4. Effect of sample width on characteristics of flame spread across eucalyptus wood surface
	WU Guihong,WU Yiqiang,HU Yunchu,ZHU Xiaodan,YANG Jianming
	Forestry 02 July 2013
	Show/Hide Abstract \| Cite this paper︱Full-text: PDF (0 B)

	Abstract:To study the effect of sample width on flame spread characteristics, a series of laboratory-scale experiments were conducted employing eucalyptus wood with width from 3 to 7 cm. Flame dimension, flame spread rate and mass loss rate were obtained. The relationship between these flame spread characteristics and sample width was explored. Both the dimensionless average flame height and depth vary as the -n power of sample width. With the increase of sample width, both the flame spread rate and mass loss rate first decrease and then rise. The minimum values appear when sample width measures 6 cm.
	TO cite this article:WU Guihong,WU Yiqiang,HU Yunchu, et al. Effect of sample width on characteristics of flame spread across eucalyptus wood surface[OL].[ 2 July 2013] http://en.paper.edu.cn/en_releasepaper/content/4547653


	5. Characterization of wood cell wall components by using LiCl/DMSO solvent system
	Zhiguo Wang,Zhulan Liu,Yunfeng Cao
	Forestry 19 March 2013
	Show/Hide Abstract \| Cite this paper︱Full-text: PDF (0 B)

	Abstract:The fractionation of wood cell wall components was achieved by the application of the LiCl/DMSO solvent system developed in our previous study. Various soluble and insoluble fractions were prepared from beech milled wood by extractions with DMSO containing different amounts of lithium chloride (LiCl) for the study of lignin-carbohydrate complex (LCC). Nitrobenzene oxidation (NO) analyses demonstrated that the lignin in the soluble fractions always has lower yields of NO products consisting of syringaldehyde + syringic acid (Sy) and vanillin + vanillic acid (Va). The syringyl ratios, Sy/(Sy+Va), were also lower than in insoluble fractions. Accordingly, lignins with lower syringyl ratios are better soluble than those with higher syringyl ratios. The former is typical in primary wall and the latter in secondary wall. Solubilization of glucan is significantly dependent on the LiCl concentration in DMSO. In the absence of LiCl, only about 6% of glucan was found in the soluble fraction, but about 40% of lignin and xylan were solubilized. The additional 40% of lignin and xylan became soluble together with glucan solubilization increased at 3% LiCl concentration. However, a fraction amounting to 13% (based on the whole wood) is still remained as a residue under these conditions. Glucan solubilization could not be the reason for this observation as ball-milled cellulose is soluble in 3% LiCl/DMSO. Probably, strong interactions between lignin and carbohydrates prevent solubilization of this fraction, that has never been isolated and analyzed in previous studies.
	TO cite this article:Zhiguo Wang,Zhulan Liu,Yunfeng Cao. Characterization of wood cell wall components by using LiCl/DMSO solvent system[OL].[19 March 2013] http://en.paper.edu.cn/en_releasepaper/content/4530916


	6. Cellulose/hydroxyapatite nanocomposites: microwave-assisted synthesis and characterization in LiCl/N,N-dimethylacetamide solvent
	MA Mingguo
	Forestry 28 January 2013
	Show/Hide Abstract \| Cite this paper︱Full-text: PDF (0 B)

	Abstract:It is well-known that LiCl/N,N-dimethylacetamide solvent is a good medium for dissolution of cellulose. In this article, cellulose/hydroxyapatite (HA) nanocomposites were carried out using microcrystalline cellulose, CaCl2, and NaH2PO4 via microwave-assisted method. The cellulose solution was previously prepared by the dissolution of microcrystalline cellulose in LiCl/N,N-dimethylacetamide solvent. The cellulose/HA nanocomposites were characterized by X-ray powder diffraction (XRD), Fourier transform infrared spectrometry (FTIR), and scanning electron microscopy (SEM). We also investigated the effects of heating times, heating temperatures, and the reactant concentrations on the phases, microstructures, and morphologies of the cellulose/HA nanocomposites. This microwave-assisted method has advantages of being simple, rapid, low-cost, and environmentally friendly. The cellulose/HA nanocomposites could be a candidate for the biomedical applications.
	TO cite this article:MA Mingguo. Cellulose/hydroxyapatite nanocomposites: microwave-assisted synthesis and characterization in LiCl/N,N-dimethylacetamide solvent[OL].[28 January 2013] http://en.paper.edu.cn/en_releasepaper/content/4518734


	7. Cloning, expression analysis, and detection method of the S12-RNase gene existing in three pear species (Pyrus bretschneideri, P. pyrifolia, and P. ussuriensis)
	Zhang Lin,Liu Min,Tan Xiaofeng,Song Zhibo,Long Hongxu,Cao Yufen,Li Xiugen
	Forestry 23 November 2012
	Show/Hide Abstract \| Cite this paper︱Full-text: PDF (0 B)

	Abstract:A specific forward primer was designed based on the principle of highest similarity, and employed in 3' RACE using Chinese white pear (Pyrus bretschneideri) cultivar 'Yingzhiqing' as materials. The full length cDNA of PbS12-RNase was successfully amplified and deposited in GenBank (Accession No. EU081889). At the amino acid level, the PbS12-RNase exhibited the highest similarity (97.3%) with MdSf-RNase of Malus domestica, and only six amino acid differences were present in the two S-RNases. Phylogenetic analysis of rocaceous S-RNases indicated that the PbS12-RNase clustered with maloideous S-RNases, forming a subfamily-specific not species-specific group. Some intraspecific genetic distance of the S-RNases, in addition, was greater than interspecific genetic distance. In 'Yingzhiqing', the PbS12-allele was specifically expressed in style. Moreover, the expression level of this gene was extremely low at the small bud stage, and subsequently increased rapidly at the bid bud stage and bell stage. A method for rapid detection of the PbS12-allele was developed via PbS12-allele-specefic primers design based on multiple sequence comparisons. Application of the PbS12-allele-specefic primers in 59 cultivars from four pear species showed that the PbS12-allele not only existed in P. bretschneideri, but in P. pyrifolia and P. ussuriensis as well. The present study could provide a scientific base for fully clarifying the mechanism of pear GSI at the molecular level.
	TO cite this article:Zhang Lin,Liu Min,Tan Xiaofeng, et al. Cloning, expression analysis, and detection method of the S12-RNase gene existing in three pear species (Pyrus bretschneideri, P. pyrifolia, and P. ussuriensis)[OL].[23 November 2012] http://en.paper.edu.cn/en_releasepaper/content/4497964


	8. Molecular cloning and sequence characterization of the full-length cDNA encoding S28-RNase from Xinjiang pear (Pyrus sinkiangenis)
	Liu Min,Zhang Lin,Wang Mingmei,Tan Xiaofeng,Song Zhibo,Li Xiugen,Cao Yufen
	Forestry 31 October 2012
	Show/Hide Abstract \| Cite this paper︱Full-text: PDF (0 B)

	Abstract:The full length cDNA encoding S28-RNase (GenBank accession No. EF566872) was cloned from styles of Xinjiang pear (Pyrus sinkiangeni) cultivar 'Kuerlexiangli' by Reverse transcription-PCR (RT-PCR) and Rapid Amplification of cDNA Ends (RACE) technology. The S28-RNase cDNA contained 865 nucleotides including a complete open reading frame (ORF) predicted to encode a protein of 228 amino acids. The S28-RNase displayed the basic structural features of pear S-RNases, i.e. five conserved regions (C1, C2, C3, RC4 and C5) and a hypervariable (HV) region. At the deduce amino acid level, S28-RNase showed 58.4% to 99.6% similarity with other pear S-RNases. The isoeletric point (pI) and molecular weight (Mw) of S28-RNase were predicted to be 9.30 and 25.6 kDa, respectively. The S28-RNase showed the conserved motifs with two histidine residue, His-61 and His-117 which are essential for T2/S type RNase activity. It also presented eight cysteine residues mostly conserved in S-RNases, forming four disulfide bridges important for the formation or stabilization of their tertiary structure. The S28-RNase also showed seven potential N-glycosilation sites, of which only one, Asn-145, conserved in rosaceous S-RNases, whose glycans may be important in the folding and stabilization of the core structure.
	TO cite this article:Liu Min,Zhang Lin,Wang Mingmei, et al. Molecular cloning and sequence characterization of the full-length cDNA encoding S28-RNase from Xinjiang pear (Pyrus sinkiangenis)[OL].[31 October 2012] http://en.paper.edu.cn/en_releasepaper/content/4493661


	9. A rapid microwave-assisted preparation of hydroxyapatite crystals on the microcrystalline cellulose matrix in N,N-dimethylformamide solvent
	MA Mingguo,WANG Bo
	Forestry 14 August 2012
	Show/Hide Abstract \| Cite this paper︱Full-text: PDF (0 B)

	Abstract:The purpose of this article is to introduce a rapid route for the preparation of biomaterials on the biomass-based polymer matrix. Herein, hydroxyapatite (HA) crystals dispersed in the microcrystalline cellulose matrix have been fabricated by using microcrystalline cellulose, CaCl2, and NaH2PO4 in N,N-dimethylformamide (DMF) solvent by a simple and rapid microwave-assisted method. The influences of the microwave heating times and the heating temperatures on the phases, microstructures, and morphologies of products were explored. The samples were characterized by X-ray powder diffraction (XRD), Fourier transform infrared spectrometry (FTIR), scanning electron microscopy (SEM), thermogravimetric analysis (TG), and differential scanning calorimetric analysis (DSC). The thermal stability of the products was also researched. This route reported here has advantages of being simple, rapid, low-cost, and environmentally friendly.
	TO cite this article:MA Mingguo,WANG Bo. A rapid microwave-assisted preparation of hydroxyapatite crystals on the microcrystalline cellulose matrix in N,N-dimethylformamide solvent[OL].[14 August 2012] http://en.paper.edu.cn/en_releasepaper/content/4486823


	10. Kinetics and FTIR characteristics of poplar wood pyrolysis process
	WANG Wenliang,REN Xueyong,CHANG Jianmin,GOU Jinsheng,CHE Yanzhe
	Forestry 05 July 2012
	Show/Hide Abstract \| Cite this paper︱Full-text: PDF (0 B)

	Abstract:The pyrolysis characteristics of poplar wood residues were investigated in a thermogravimetric analyzer coupled to a Fourier Transform Infrared Spectrometer (TG-FTIR). The pyrolysis process can be subdivided into four stages at 10 ℃/min varied from 30 to 650℃. A weight loss for drying and preheating the sample is below 180℃ and the onset temperature of initial pyrolysis is in the range of 180~260 ℃. A significant mass loss of 61.4wt.% occurred between 260~380℃ and it is followed by a slow and continuous mass change with lignin devolatilization. The analysis of kinetic reactions showed that the activation energy (78.29 kJomol-1) in low temperature section is much larger than that (6.40 kJomol-1) in high temperature section. The evolved gases formed by thermal degradation of poplar wood were simultaneously analyzed by FTIR. It is observed from the main peaks that the emissions evolved during poplar wood pyrolysis were acetic acid, carbon dioxide, carbon monoxide, methane, water, some volatile compounds of esters, alcohols and aldehydes. The emissions gradually increased with the increasing temperature before a strong peak around 360℃ and then decreased. Most gasous products were emitted in 320~380℃, while CO2 was continuously emitted from a wide range of 140~550℃.
	TO cite this article:WANG Wenliang,REN Xueyong,CHANG Jianmin, et al. Kinetics and FTIR characteristics of poplar wood pyrolysis process[OL].[ 5 July 2012] http://en.paper.edu.cn/en_releasepaper/content/4483870

	Check out RSS, or use RSS reader to subscribe this item