Time filter

Source Type

Li D.,China University of Petroleum - East China | Li D.,Zhejiang University | Li D.,Key Laboratory of Wood Science and Technology | Li C.,Qingdao Hisense Hitachi Air conditioning Systems Co. | And 3 more authors.
Materials Letters | Year: 2015

We studied effects of impregnation ratio and activation time on ultramicropores of KOH-activated peanut shell active carbons (ACs). The ultramicropores were characterized in terms of ultramicropore volume (V<0.7 nm), ultramicropore fraction (V<0.7 nm/Vt), and pore size distribution. The ultramicropores of the ACs were mostly in the range of 0.45-0.70 nm. Increasing the impregnation ratio from 1 to 3 first increased the V<0.7 nm and V<0.7 nm/Vt, and then decreased them. Prolonging the activation time from 1 h to 2 h resulted in a minimum V<0.7 nm/Vt, but hardly affected the V<0.7 nm. The AC with the highest V<0.7 nm (0.11 ml/g) was obtained by activation for 1-2 h at an impregnation ratio of 2. The V<0.7 nm bore a linear relationship with the CO2 uptakes at 0.1 and 0.2 bar (0 °C). This research was significant for preparation of ACs with developed ultramicropores. © 2014 Elsevier B.V. All rights reserved.

Guo M.,Zhejiang Agriculture And forestry University | Fei M.,Zhejiang Agriculture And forestry University | Liu H.,Zhejiang Agriculture And forestry University | Liu H.,Key Laboratory of Wood Science and Technology | And 2 more authors.
Polymer Chemistry | Year: 2015

A novel cellulose-based hyperbranched polyester (CHBP) has been prepared through the polycondensation of an ABn-type monomer, which was synthesized from a reaction of acetylated oligomeric cellulose bromide with tyrosine via the Koenigs-Knorr reaction, followed by deacetylation. Its chemical structure, thermal stability as well as biodegradability were preliminarily investigated. This journal is © The Royal Society of Chemistry 2015.

Li Y.,Zhejiang Agriculture And forestry University | Li Y.,Key Laboratory of Wood Science and Technology | Yin L.,Zhejiang Agriculture And forestry University | Yin L.,Key Laboratory of Wood Science and Technology | And 7 more authors.
Holzforschung | Year: 2015

Bamboo was thermally treated at 180°C and 200°C, and the micromechanical properties of its cell walls were investigated by means of quasi-static and dynamic nanoindentation experiments. With increasing treatment temperatures, the average dry density and mass of the bamboo decreased, whereas the already reduced elastic modulus at 180°C of the fiber cell walls did not change, but the hardness showed increasing tendencies. Dynamic nanoindentation revealed reduced storage modulus (E′r) $({E'-{\rm{r}}})$ and loss modulus (E″r) $({E''-{\rm{r}}}\,)$ for the thermotreated bamboo cell walls compared with the untreated bamboo fibers in all frequency regions. Moreover, E′r,E″r, ${E'-{\rm{r}}},{\rm{ }}{E''-{\rm{r}}},$ and loss tangent (tan δ) of treated bamboo decreased with increasing treatment temperature. © 2015 by De Gruyter.

Li D.,China University of Petroleum - East China | Li D.,Shandong University of Science and Technology | Li D.,Key Laboratory of Wood Science and Technology | Li D.,Zhejiang University | And 4 more authors.
Journal of Porous Materials | Year: 2015

Highly microporous carbons with large CO2 uptakes at atmospheric pressure were prepared by KOH activation of peanut shell char at different temperatures (680–780 °C). The porous carbons (PCs) showed a microporosity of 99.0–99.5 %, with micropore volume and specific surface area varying from 0.73 to 0.79 ml/g and 1713 to 1893 m2/g, respectively. The adsorption of CO2 onto the PCs was a physisorption process. The CO2 uptakes of the PCs increased with decreasing the activation temperature. The 680 °C-activated sample showed a 1-bar CO2 uptake of 7.25 mmol/g (0 °C), which was among the highest values ever reported for biomass-based PCs. The high uptake was principally ascribable to its developed small micropores (<1 nm). Besides, this PC displayed a large 1-bar CO2 uptake at 25 °C (4.41 mmol/g), fast CO2 adsorption rate, moderate CO2-over-N2 selectivity, and excellent recyclability. These adsorption properties showed that the peanut-shell-based PC was a promising adsorbent for CO2 capture or storage. © 2015 Springer Science+Business Media New York

Miao H.,Chinese Academy of Forestry | Zhou Y.,Chinese Academy of Forestry | Zhou Y.,Key Laboratory of Wood Science and Technology | Sheng Z.,China Foma Group Co. | And 5 more authors.
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | Year: 2014

The hot platen needs to be lifted and descended integrally, and to be kept in horizontal level during the process which was realized by position synchronization control of multiple group hydraulic cylinders. It is a difficult point in control of continuous flat press. In order to solve this problem, a ramp type successive-approximation algorithm was proposed. The algorithm can dynamically select one group of hydraulic cylinder as "virtual main system", and the other groups as "slave system" according to the actual displacement of the hydraulic cylinders in any control cycle. Then the virtual main system can gradually approach the target value step-by-step with a certain ramp. At the same time the slave system tracks the virtual main system in real time, so that it can be realized that the multiple group hydraulic cylinders move synchronously during the lifting and descending process. The algorithm was simulated in Matlab. Then the algorithm was applied to the continuous flat press production line designed by China Foma (Group)Co., Ltd. Production practice indicates that the algorithm can solve the interaction and influence between the multiple group hydraulic cylinders in movement effectively. The synchronous error of the lifting and descending process is 0.5 mm and 0.6 mm respectively. The shock of hydraulic components is less, the process is smooth and the control precision can meet technological requirements.

Discover hidden collaborations