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Li H.,Guangxi Key Laboratory of New Energy and Building Energy Saving | Li H.,North China University of Water Conservancy and Electric Power | Jia J.,North China University of Water Conservancy and Electric Power | Zhang P.,Nanyang Construction and Administration Office | And 2 more authors.
Advanced Materials Research | Year: 2012

A constitutive model for collapsible loess material is presented. The numerical experiments indicate that this model can capture hydrocompaction behaviors of loess material under different water contents and pressures. The numerical results show good agreement with the laboratory tested collapsibility parameters of the loess material. The model is also applied to study a loess material-filled slope with height of 38m using FLAC5.0. The stability and the collapsibility deformation status of the loess slope are analyzed. © (2012) Trans Tech Publications. Source

Wang L.,Guilin University of Technology | Wang L.,Guangxi Key Laboratory of New Energy and Building Energy Saving | Li C.,Project 6 Research | Yi J.,Guilin University of Technology
Journal of Coastal Research | Year: 2015

The flexural behavior of the corroded reinforced concrete (RC) beam with different concrete strengths under fatigue loading has not been truly well-understood. Twelve RC beams (section size 120×200; total length 1700 mm; clear span 1500 mm) with concrete strengths (C20, C25, C30, and C35) were tested under specified fatigue and monotonic load in this study. The tests were aimed to evaluate the mechanical behavior of the corroded reinforced concrete beams with different failure patterns after fatigue and monotonic loading. The parameters evaluated in this experimental study include distortion, stress distribution and ultimate strength of the corroded reinforced concrete beams. The results showed that the load capacity and the rigidity of the corroded beams are increased with the concrete strength. The performance of the RC beams is greatly affected by the corrosion in terms of fatigue capacity, which reduces the ultimate strength and the ductility of the beams significantly. © 2015 Coastal Education and Research Foundation, Inc. Source

Yang J.,Guilin University of Technology | Yang J.,Guangxi Key Laboratory of New Energy and Building Energy Saving | Yan B.,Guilin University of Technology | Ye J.,Guilin University of Technology | Li X.,Guilin University of Technology
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2015

At present, the lithium-ion battery is mainly limited by safety, high-power performance and cost. These problems are expected to be solved by new high-performance anode material of lithium titanate oxides. Based on the recent research progress, several representative lithium-titanium-oxygen species lithium intercalation compounds such as Li4Ti5O12, LiTi2O4, Li2Ti3O7, and Li2Ti6O13 are selected. The important achievements of their crystal structures, electrochemical properties, preparation methods, chemical modifications and application researches are comprehensively elaborated. Finally, the direction of future research and development for such anode materials are pointed out. ©, 2015, Rare Metals Materials and Engineering Press. All right reserved. Source

Yang J.,Guilin University of Technology | Yang J.,Guangxi Key Laboratory of New Energy and Building Energy Saving | Yan B.,Guilin University of Technology | Ye J.,Guilin University of Technology | And 3 more authors.
Physical Chemistry Chemical Physics | Year: 2014

In this work, carbon-free and carbon-coated spinel LiCrTiO4 oxides were synthesized by a conventional solid state reaction. The lithium-ion diffusion coefficient and electronic conductivity of prepared electrode materials were systematically investigated using the galvanostatic intermittent titration technique (GITT), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). The rate performances of the prepared materials were evaluated by galvanostatic charge-discharge. Carefully comparing the charge-discharge polarization potential of both materials, we unexpectedly discovered that the pristine LiCrTiO4 electrode demonstrated asymmetric polarization during the charging-discharging process, which is possibly attributed to the nonuniform electron conductivity between the endmember of a two-phase reaction, whereas carbon coating could level this phenomenon. Additionally, using an asymmetric core-shell model from the microscopic point of view can easily explain this common phenomenon. Meanwhile, this new research perspective can be extended to other active materials in lithium ion batteries. This journal is © the Owner Societies 2014. Source

Hu H.,Northeast Forestry University | Luo B.,Northeast Forestry University | Wei S.,Northeast Forestry University | Wei S.,Guilin University of Technology | And 8 more authors.
Shengtai Xuebao/ Acta Ecologica Sinica | Year: 2015

As global climate change continues to accelerate, biological carbon storage, which plays an important ecological role in forest ecosystems, have a very significant effect on carbon emissions and carbon sinks and also play an important role in carbon cycle. Forest ecosystems, as a principal component of terrestrial ecosystems, are the world’s largest carbon (C) pool and C sink. The amount of C storage in vegetation plays an important role in global C cycle and C balance. Scientifically and effectively measuring biological C storage provides important data needed for understanding the significance of forest biomass in the C cycle as well as for understanding climate change. This study analyzed biological C storage in typical forest types in the Daxing’anling Mountains in Heilongjiang Province, China, using forest inventory data and geographic information system technology. Five typical forest types in the Daxing’anling Mountains were studied using various age groups and different forest components (trees, shrubs, herbs and litter), specifically Larix gmelinii, Betula platyphylla, Pinus sylvestris var. mongolica, Quercus mongolica, and Populus davidiana forests. For each forest type, tree,understory shrub, herb, and litter layers were surveyed to determine and measure biomass per unit area, C biomass, and C forest stocks. At the stand level, age groups were classified so that estimates of forest biomass and forest C stocks in the study area could be calculated. The biomasses in different age groups of the five typical forest types in the Daxing’anlingMountains including young forest, middle-aged forest, near mature forest, and mature forest were analyzed:. Biomass perunit area of Larix gmelinii forests for these four age groups was 31.00 t/ hm2, 101.29 t/ hm2, 188.46 t/ hm2, and 215.23 t/hm2, respectively. Similarly, the same four age groups of Betula platyphylla forests held 33.13 t/ hm2, 65.64 t/ hm2, 88.67 t/ hm2, and 136.38 t/ hm2 of biomass per unit area; the four age groups of Pinus sylvestris var. mongolica forests had 61.22t/ hm2, 120.30 t/ hm2, 179.10 t/ hm2, and 229.43 t/ hm2 of biomass per unit area; the four age groups of Quercus mongolica forests had 23.89 t/ hm2, 25.00 t/ hm2, 70.70 t/ hm2, and 126.20 t/ hm2 of biomass per unit area; and, the four age groups of Populus davidiana forests had 47.28 t/ hm2, 61.71 t/ hm2, 91.16 t/ hm2, and 135.53 t/ hm2 of biomass per unit area,respectively. Our study determined that biological C storage of the five typical forest types in different age groups variedwidely in the Daxing’anling Mountains. C storage per unit area for young forest, middle-aged forest, near mature forest, andmature forest listed in respective order, for each forest type are as follows: 15.20 t/ hm2, 50.96 t/ hm2, 95.80 t/ hm2, and 109.33t/ hm2 for Larix gmelinii forests; 15.36 t/ hm2, 30.67 t/ hm2, 41.62 t/ hm2, and 64.35t/ hm2 for Betula platyphylla forests; 29.89 t/ hm2, 59.92 t/ hm2, 90.01 t/ hm2, and 117.08 t/ hm2 for Pinus sylvestris var. mongolica forests; 11.17 t/hm2, 11.90 t/ hm2, 34.94 t/ hm2, and 59.49 t/ hm2 for Quercus mongolica forests; and, 21.81 t/ hm2, 28.58 t/ hm2, 42.84 t/ hm2, and 64.39 t/ hm2 for Populus davidiana forests. These results show that biological C stocks in the Daxing’anlingMountains play an important role in the C cycle and regional C balance. Different age groups in five typical forest types serve as forest C stocks based on forest biological age with the C stock increasing with forest growth and aging. Nevertheless, the type of forest C sink function varies in different forest types, although the same types of large differences were observed in biological C forest reserves in stands of different ages among the five forest types. Because most of the growth in the five major forest types occurs in young and middle-aged forest, forests at these ages have a great potential to provide C storage in forest vegetation. This significant C sink function is further enhanced in the Daxing’anling Mountains area with the development and restoration of areas designed to provide specific ecological services including important role as C sinks. In order to achieve sustainable development of these forest ecosystem, a defined C management strategy should be developed that includes an increasing use of these potential C sinks and simultaneously includes plans for the management of economic growth. Our findings are important for land managers and other stakeholders who need to gain correct understanding of biological effects of forest C stocks and C balance as part of regional ecological analysis. Our results also provide reference data related to the full effect of forest plantations as C sinks as it relates to future silvicultural and reforestation activities. © 2015 Ecological Society of China. All Rights Reserved. Source

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