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| 1 | Soil erosion along a long slope in the gentle hilly areas of black soil region in Northeast China显示文摘沿着在在在东北中国的黑土壤区域的轻轻的多山的区域的一个长斜坡的土壤侵蚀变化的特征被讨论。一个简化斜坡模型基于片断被用来分析在 Heshan 农场与不同斜坡长度在 10 个地阴谋上在 2003 和 2004 之间观察的流量数据和土壤侵蚀数据, Heilongjiang 省。我们发现土壤侵蚀在沿着斜坡或者改变的黑土壤区域在长斜坡上评价并且创造集中的侵蚀和星期侵蚀的其他的地区。每个地区的准确地方为不同降雨条件是不同的。在有更少和温和降水的一年里,小河不能发生在顶以内 50 m 在有大、集中的降水的一年里,小河能被形成从斜坡的顶甚至在 15 m 开始。 | CUI Ming CAI Qiangguo ZHU Axing FAN Haoming | 2007 | Journal of Geographical Sciences2007，17，3： | 18 |
| 2 | High temperature performance of coaxial h-BN/CNT wires above 1,000 ℃:Thermionic electron emission and thermally activated conductivity显示文摘The development of wires and cables that can tolerate extremely high temperatures will be very important for probing extreme environments, such as in solar exploration, fire disasters, high-temperature materials processing, aeronautics and astronautics. In this paper, a lightweight high-temperature coaxial h-boron nitride (BN)/carbon nanotube (CNT) wire is synthesized by the chemical vapor deposition (CVD) epitaxial growth of h-BN on CNT yarn. The epitaxially grown h-BN acts as both an insulating material and a jacket that protects against oxidation. It has been shown that the thermionic electron emission (1,200 K) and thermally activated conductivity (1,000 K) are two principal mechanisms for insulation failure of h-BN at high temperatures. The thermionic emission of h-BN can provide the work function of h-BN, which ranges from 4.22 to 4.61 eV in the temperature range of 1,306-1,787 K. The change in the resistivity of h-BN with temperature follows the ohmic conduction model of an insulator, and it can provide the “electron activation energy”(the energy from the Fermi level to the conduction band of h-BN), which ranges from 2.79 to 3.08 eV, corresponding to a band gap for h-BN ranging from 5.6 to 6.2 eV. However, since the leakage current is very small, both phenomena have no obvious influence on the signal transmission at the working temperature. This lightweight coaxial h-BN/CNT wire can tolerate 1,200 ℃ in air and can transmit electrical signals as normal. It is hoped that this lightweight high-temperature wire will open up new possibilities for a wide range of applications in extreme high-temperature conditions. | Xinhe Yang Peng Liu Duanliang Zhou Feng Gao Xinhe Wang Shiwei Lv Zi Yuan Xiang Jin Wei Zhao Haoming Wei Lina Zhang Jiandong Gao Qunqing Li Shoushan Fan Kaili Jiang | 2019 | Nano Research2019，12，8： | 2 |
| 3 | High-strength composite yarns derived from oxygen plasma modified super-aligned carbon nanotube arrays显示文摘 | Haoming Wei Yang Wei Yang Wu Liang Liu Shoushan Fan Kaili Jiang | 2013 | Nano Research2013，6，3： | 1 |
| 4 | One-pot synthesis of N-doped petroleum coke-based microporous carbon for high-performance CO_(2) adsorption and supercapacitors显示文摘Waste resource utilization of petroleum coke is crucial for achieving global carbon emission reduction.Herein,a series of N-doped microporous carbons were fabricated from petroleum coke using a one-pot synthesis method.The as-prepared samples had a large specific surface area(up to 2512 m^(2)/g),a moderate-high N content(up to 4.82 at.%),and high population(55%)of ultra-micropores(<0.7 nm).Regulating the N content and ultra-microporosity led to efficient CO_(2)adsorption and separation.At ambient pressure,the optimal N-doped petroleum coke-based microporous carbon exhibited the highest CO_(2)uptake of 4.25 mmol/g at 25℃ and 6.57 mmol/g at 0℃.These values are comparable or even better than those of numerous previously reported adsorbents prepared by multistep synthesis,primarily due to the existence of ultra-micropores.The sample exhibited excellent CO_(2)/N_(2)selectivity at 25℃ owing to the abundant basic pyridinic and pyrrolic N species;and showed superior CO_(2)adsorption-desorption cycling performance,which was maintained at 97% after 10 cycles at 25℃.Moreover,petroleum coke-based microporous carbon,with a considerably high specific surface area and hierarchical pore structure,exhibited excellent electrochemical performance over the N-doped sample,maintaining a favorable specific capacitance of 233.25F/g at 0.5 A/g in 6 mol/L KOH aqueous electrolyte.This study provides insight into the influence of N-doping on the porous properties of petroleum coke-based carbon.Furthermore,the as-prepared carbons were found to be promising adsorbents for CO_(2)adsorption,CO_(2)/N_(2)separation and electrochemical application. | Wenfu Zhu Yuqin Wang Fan Yao Xiaohong Wang Haoming Zheng Guangzheng Ye Hairong Cheng Junliang Wu Haomin Huang Daiqi Ye | 2024 | Journal of Environmental Sciences2024，，5： | 0 |
| 5 | Assessment of gully erosion susceptibility using different DEM-derived topographic factors in the black soil region of Northeast China显示文摘As a primary sediment source,gully erosion leads to severe land degradation and poses a threat to food and ecological security.Therefore,identification of susceptible areas is critical to the prevention and control of gully erosion.This study aimed to identify areas prone to gully erosion using four machine learning methods with derived topographic attributes.Eight topographic attributes(elevation,slope aspect,slope degree,catchment area,plan curvature,profile curvature,stream power index,and topo-graphic wetness index)were derived as feature variables controlling gully occurrence from digital elevation models with four different pixel sizes(5.0 m,12.5 m,20.0 m,and 30.0 m).A gully inventory map of a small agricultural catchment in Heilongjiang,China,was prepared through a combination of field surveys and satellite imagery.Each topographic attribute dataset was randomly divided into two portions of 70%and 30%for calibrating and validating four machine learning methods,namely random forest(RF),support vector machines(SVM),artificial neural network(ANN),and generalized linear models(GLM).Accuracy(ACC),area under the receiver operating characteristic curve(AUC),root mean square error(RMSE),and mean absolute error(MAE)were calculated to assess the performance of the four machine learning methods in predicting spatial distribution of gully erosion susceptibility(GES).The results suggested that the selected topographic attributes were capable of predicting GES in the study catchment area.A pixel size of 20.0 m was optimal for all four machine learning methods.The RF method described the spatial relationship between the feature variables and gully occurrence with the greatest accuracy,as it returned the highest values of ACC(0.917)and AUC(0.905)at a 20.0 m resolution.The RF was also the least sensitive to resolutions,followed by SVM(ACC=0.781-0.891,AUC=0.724-0.861)and ANN(ACC=0.744-0.808,AUC=0.649-0.847).GLM performed poorly in this study(ACC=0.693-0.757,AUC=0.608-0.703).Based on the spatial distribution of GES determined using the optimal method(RF+pixel size of 20.0 m),16%of the study area has very high level susceptibility classes,whereas areas with high,moderate,and low levels of susceptibility make up approximately 24%,30%,and 31%of the study area,respectively.Our results demonstrate that GES assessment with machine learning methods can successfuly identify areas prone to gully erosion,providing reference information for future soil conservation plans and land management.In addition,pixel size(resolution)is the key consideration when preparing suitable datasets of feature variables for GES assessment. | Donghao Huang Lin Su Lili Zhou Yulu Tian Haoming Fan | 2023 | International Soil and Water Conservation Research2023，11，1： | 0 |
| 6 | TEMPORAL AND SPATIAL DYNAMICS OF DIFFERENT PARTICLE SIZE OF SUSPENDED SEDIMENT IN THE LIU RIVER CATCHMENTS, CHINA显示文摘This paper presents information on the particle size characteristics of suspended sediment transported by the Liu River, which has the most serious erosion and sedimentation problems in the northeast of China. The median (d50) particle size for the individual stations on the Liu River ranged from 0.0343 to 0.0588 mm. Particles <0.01 mm ranged from 15.4 to 33.3% and >0.05 mm of ranged from 24.3 to 53.7%. Spatial and temporal variations were noticeable in the particle size composition of suspended sediment within the study basins. At different locations the sediment particles size varies as a result of differences in catchment characteristics. The preferential deposition of the coarser size fractions has resulted in downstream fining of the suspended sediment load. In the flood season the suspended sediment particle size was finer than that in low flow season. The relations among water discharge, suspended sediment concentration, and sediment particle size are complicated. At small water discharge or suspended sediment concentration, with the increase of water discharge or sediment concentration the particle size of suspended sediment decreases to a minimum. However, when the water discharge or sediment concentration exceed certain threshold values (turning points) the particle size increases or remains constant with the increase of water discharge or sediment concentration. The tuning points are different in different rivers. Thus, their relations are double-valued. The negative relation between suspended sediment particle size and flow discharge reflects the importance of supply conditions and the positive relation reflects that the flow and hydraulics take a greater role in sediment transportation. On the whole, variation of the sediment particle size is subject to many factors such as the hydraulic conditions, the type and extent of erosion, human activities, vegetation coverage, hydraulic projects, and sediment supply. The findings reported in this paper have important implications for understanding suspended sediment dynamics and sediment control in river basins. | Haoming FAN Qiangguo CAI Chengjiu GUO Tieliang WANG | 2006 | International Journal of Sediment Research2006，21，3： | 0 |
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