Nanjing Forestry University

www.njfu.edu.cn
Nanjing, China

Nanjing Forestry University is an institution of higher learning in Nanjing, China. It is jointly run and administered by central government of Jiangsu Provincial Government. The origin of the university can be traced back to the Forest Departments of Jinling University and Central University. In 1952, Nanjing Forestry College was established after the merger of the Forest Departments from Wuhan University, Nanchang University, and Hubei Agricultural College. It was renamed Nanjing Technological College of Forest Products in 1972. It adopted the current name in 1985. Wikipedia.

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Zhang L.,Nanjing Forestry University
Journal of Physics Condensed Matter | Year: 2017

We theoretically propose a dual-channel current valve based on a three terminal zigzag graphene nanoribbon (ZGNR) junction driven by three asymmetric time-dependent pumping potentials. By means of the Keldysh Green's function method, we show that two asymmetric charge currents can be pumped in the different left-right terminals of the device at a zero bias, which mainly stems from the single photon-assisted pumping approximation and the valley valve effect in a ZGNR p-n junction. The ON and OFF states of pumped charge currents are crucially dependent on the even-odd chain widths of the three electrodes, the pumping frequency, the lattice potential and the Fermi level. Two-tunneling spin valves are also considered to spatially separate and detect 100% polarized spin currents owing to the combined spin pump effect and the valley selective transport in a three terminal ZGNR ferromagnetic junction. Our investigations might be helpful to control the spatial and spin degrees of freedom of electrons in graphene pumping devices. © 2016 IOP Publishing Ltd.


Berselli L.C.,University of Pisa | Fan J.,Nanjing Forestry University
Communications on Pure and Applied Analysis | Year: 2015

In this paper, we prove some logarithmically improved regularity criteria for the 3D nematic liquid crystals models, Boussinesq system, and MHD equations in a bounded domain.


Wang X.,Nanjing Forestry University | Liu X.,Shanghai Research Institute of Building Sciences
Renewable and Sustainable Energy Reviews | Year: 2015

The central focus of the project is to optimize the energy and resource efficiency design for the proposed tall building: Blue Star, which is located in Chicago, as well as incorporating potential LEED credited features with it. Based on the weather analysis, some innovative energy efficient technologies are utilized in the project with the consideration of architectural function, building form, facade structure, water supply and treatment system, construct-ability etc., simultaneously having some exploration on vertical city strategies and sustainable urban design and planning ideas. Depend on the energy simulation and performance calculation, three major factors: annual energy saving rate, on-site renewable energy and water use reduction, are figured out for achieving potential LEED credited points, which can demonstrate the sustainable level of the building with a single number from certain aspect. © 2015 Elsevier Ltd. All rights reserved.


A novel colorimetric and fluorescent anion sensor based on urea substituted with a coumarin moiety and a pendant phenylazo unit was synthesized and evaluated according to the binding site-signalling subunit approach. The azo group was exploited as the chromogene, the urea moiety providing the anion binding site and the coumarin system was responsible for fluorescence. As such, the dye enabled visual detection of acetate ion in DMSO (color change light yellow to red) without resorting to spectroscopic instrumentation. More importantly, the sensor displayed significant fluorescence enhancement response to anions such as acetate, because of complex formation. © 2010 Elsevier Ltd. All rights reserved.


Wang Y.P.,Nanjing Forestry University
Mathematical Methods in the Applied Sciences | Year: 2013

In this paper, we discuss the inverse problem for Sturm-Liouville operators with arbitrary number of interior discontinuities and boundary conditions having fractional linear function of spectral parameter on the finite interval [0,1]. Using Weyl function techniques, we establish some uniqueness theorems for the Sturm-Liouville operator. Copyright © 2012 John Wiley & Sons, Ltd. Copyright © 2012 John Wiley & Sons, Ltd.


A nematophagous fungus, Esteya vermicola, is recorded as the first endoparasitic fungus of pine wood nematode (PWN), Bursaphelenchus xylophilus, in last century. E. vermicola exhibited high infectivity toward PWN in the laboratory conditions and conidia spraying of this fungus on Japanese red pine, Pinus densiflora, seedlings in the field protected the pine trees from pine wilt disease to some extent, indicating that it is a potential bio-control agent against PWN. Previous research had demonstrated that the living fungal mycelia of E. vermicola continuously produced certain volatile organic compounds (VOCs), which were responsible for the PWN attraction. However, identity of these VOCs remains unknown. In this study, we report the identification of α-pinene, β-pinene, and camphor produced by living mycelia of E. vermicola, the same volatile compounds emitted from PWN host pine tree, as the major VOCs for PWN attraction using gas chromatography-mass spectrometry (GC-MS). In addition, we also confirmed the host deception behavior of E. vermicola to PWN by using synthetic VOCs in a straightforward laboratory bioassay. This research result has demonstrated that the endoparasitic nematophagous fungus, E. vermicola, mimics the scent of PWN host pine tree to entice PWN for the nutrient. The identification of the attractive VOCs emitted from the fungus E. vermicola is of significance in better understanding parasitic mechanism of the fungus and the co-evolution in the two organisms and will aid management of the pine wilt disease.


Zheng F.,Nanjing Forestry University | Ding S.,Nanjing Forestry University
Applied and Environmental Microbiology | Year: 2013

EG1 is a modular glycoside hydrolase family 5 endoglucanase from Volvariella volvacea consisting of an N-terminal carbohydrate-binding module (CBM1) and a catalytic domain (CD). The ratios of soluble to insoluble reducing sugar produced from filter paper after 8 and 24 h of exposure to EG1 were 6.66 and 8.56, respectively, suggesting that it is a processive endoglucanase. Three derivatives of EG1 containing a core domain only or additional CBMs were constructed in order to evaluate the contribution of the CBM to the processivity and enzymatic mode of EG1 under stationary and agitated conditions. All four enzymatic forms exhibited the same mode of action on both soluble and insoluble cellulosic substrates with cellobiose as a main end product. An additional CBM fused at either the N or C terminus reduced specific activity toward soluble and insoluble celluloses under stationary reaction conditions. Deletion of the CBM significantly decreased enzyme processivity. Insertion of an additional CBM also resulted in a dramatic decrease in processivity in enzyme-substrate reaction mixtures incubated for 0.5 h, but this effect was reversed when reactions were allowed to proceed for longer periods (24 h). Further significant differences were observed in the substrate adsorption/desorption patterns of EG1 and enzyme derivatives equipped with an additional CBM under agitated reaction conditions. An additional family 1 CBM improved EG1 processivity on insoluble cellulose under highly agitated conditions. Our data indicate a strong link between high adsorption levels and low desorption levels in the processivity of EG1 and possibly other processive endoglucanses. © 2013, American Society for Microbiology.


Patent
Nanjing Forestry University | Date: 2015-07-08

A trunk injection needle includes: a front part which is conical, a middle part which is cylindrical, and a rear part which is cylindrical, which are respectively provided along a needle axis; wherein an outer diameter of the rear part is larger than outer diameters of the front part and the middle part; the front part has a bits guiding hole extending along the needle axis, and the rear part has a drug feeding hole extending along the needle axis; wherein the middle part has two outlet holes extending along a radical direction, and a separating board is provided between the two outlet holes; a rear end of the bits guiding hole communicates with the two outlet holes at two sides of the separating board; and a front end of the drug feeding hole communicates with the two outlet holes.


Patent
Nanjing Forestry University | Date: 2014-04-21

A self-pumping hydrodynamic mechanical seal includes a rotating ring (3) and a stationary ring (11). More than three sets of backward curved grooves (39) are provided on a seal face of the rotating ring (3), outlets of the backward curved grooves (39) are provided at an external diameter portion of the seal face of the rotating ring (3), and an inlet (31) connects with a seal chamber (1) through a duct (30) of the rotating ring (3) or the stationary ring (11). When the rotating ring (3) rotates, a medium in the backward curved grooves (39) is accelerated into a high-speed fluid; under a centrifugal force, the high-speed fluid moves to an external diameter side of the rotating ring (3), so as to be pumped into the seal chamber (1) and generates a low-pressure area at the inlets (31) of the backward curved grooves (39); the medium in the seal chamber (1) is driven by a pressure difference, so as to flow into the backward curved grooves (39) through the duct (30), for forming circulation of self-pumping. During pumping the high-speed fluid, a flow speed of the high-speed fluid is slowed and a pressure of the high-speed fluid is increased, as a flow sectional area of the backward curved grooves (39) is increased, so as to generate an opening force which separates the rotating ring (3) from the stationary ring (11). The seal has desirable capabilities of self-lubrication, self-flushing, solid particle interference resistance, and optimal sealing performance.


Patent
Nanjing Forestry University | Date: 2013-12-27

A device for testing mechanical seal performance includes a main shaft (4), a working chamber (18) with two end covers (6, 13) respectively located at two ends thereof, and two groups of mechanical seals to be tested (7); wherein a shaft sleeve (5) and the main shaft (4) form a clearance fit and penetrate through the end covers (6, 13) at two ends of the working chamber (18) together; the shaft sleeve (5) extends outside U-shaped openings (23) which are arranged at two ends of the end covers (6, 13) and arranged on the same generatrix; driven pins (15) are arranged on the locations of the main shaft (4) corresponding to the U-shaped openings (23); the middle part of the shaft sleeve (5) is provided with two segments of threads having the same thread pitch and opposite rotating directions.

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