|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Drilling load modeling and validation based on the filling rate of auger flute in planetary sampling显示文摘Some type of penetration into a subsurface is required in planetary sampling. Drilling and coring, due to its efficient penetrating and cuttings removal characteristics, has been widely applied in previous sampling missions. Given the complicated mechanical properties of a planetary regolith, suitable drilling parameters should be matched with different drilling formations properly.Otherwise, drilling faults caused by overloads could easily happen. Hence, it is necessary to establish a drilling load model, which is able to reveal the relationships among drilling loads, an auger's structural parameters, soil's mechanical properties, and relevant drilling parameters. A concept for the filling rate of auger flute(FRAF) is proposed to describe drilling conditions. If the FRAF index under one group of drilling parameters is less than 1, this means that the auger flute currently removes cuttings smoothly. Otherwise, the auger will be choked with compressed cuttings. In drilling operations, the drilling loads on the auger mainly come from the conveyance action, while the drilling loads on the drill bit primarily come from the cutting action. Experiments in one typical lunar regolith simulant indicate that the estimated drilling loads based on the FRAF coincide with the test results quite well. Based on this drilling load model, drilling parameters have been optimized. | Quan Qiquan Tang Junyue Yuan Fengpei Jiang Shengyuan Deng Zongquan | 2017 | Chinese Journal of Aeronautics2017，30，1： | 7 |
| 2 | A meta-analysis of the canopy light extinction coefficient in terrestrial ecosystems显示文摘华盖光扑灭系数(K) 是在影响生态系统碳,水,和精力过程的一个关键因素。然而, K 在多样的陆上的生态系统由于在里面地点大小的缺乏在大多数 biogeochemical 模型作为一个常数被假定。在这研究,由编在 88 个陆上的生态系统测量的 K 的数据,我们越过主要生态系统类型调查了这个索引的空间与时间的变化,包括草地,农田, shrubland,阔叶烟草森林,和 needleleaf 森林。我们的结果显示所有生物群系的平均 K 在完整的成长期间打字季节是 0.56。然而,在种季节的山峰的这价值是 0.49,显示季节的变化的某个度。另外,在 K 的大变化存在在以内并且在植物之中功能的类型。农田有 K (0.62 ) 的最高的价值,由阔叶烟草列在后面森林(0.59 ) , shrubland (0.56 ) ,草地(0.50 ) ,和 needleleaf 森林(0.45 ) 。没有重要空间关联在 K 和主要环境因素之间被发现,即,吝啬的年度降水,吝啬的年度温度,和叶区域索引(LAI ) 。Intra 每年,在 K 之间的重要否定关联和在 LAI 的季节的变化在自然生态系统被发现。然而,在农田,时间的关系是地点特定的。有在这研究观察的 LAI 的 K 和它的时间的关系的特定的价值可以贡献的生态系统类型改善了全球 biogeochemical 周期当模特儿。 | Liangxia ZHANG Zhongmin HU Jiangwen FAN Decheng ZHOU Fengpei TANG | 2014 | Frontiers of Earth Science2014，8，4： | 5 |
| 3 | Hierarchical,seamless,edge-rich nanocarbon hybrid foams for highly efficient electromagnetic-interference shielding显示文摘Lightweight,flexible,ultrahigh-performance electromagnetic-interfe rence(EMI)shielding materials are urgently required in the areas of aircraft/aerospace,portable and wearable electronics.Herein,1 D carbon nanotubes(CNT)and carbon nanofibers(CNF)with 2 D edge-rich graphene(ERG)are used to form a lightweight,flexible CNT-ERG-CNF hybrid foam.This foam was fabricated through a self-sacrificial templating chemical vapor deposition process,where nanocarbons bond through covalent bonding,forming a hierarchical 3 D hybridized carbon nanostructure.Multistage conductive networks and heterogeneous interfaces were constructed using edge-rich nanocarbons to increase the induced currents and interfacial polarization which makes great contributions to achieve high absorption electromagnetic shielding effectiveness(SEA).The CNT-ERG-CNF hybrid foam exhibits EMI shielding effectiveness(SE)exceeding55.4 dB in the X-band while the specific SE(SSE,SE divided by mass density)achieves 9200 dB cm^(3)g^(-1),which surpasses that of nearly all other carbon-based composite materials.Furthermore,the structural stability and durability of the flexible CNT-ERG-CNF hybrid foams is examined by measuring EMI SE after 10000 times cyclic bending.Remarkably,this work not only provides a new idea for preparing hierarchical carbon materials for a wide range of applications,but presents some fundamental insights for achieving higher absorption losses in EMI shielding materials. | Liyuan Han Qiang Song Kezhi Li Xuemin Yin Jiajia Sun Hejun Li Fengpei Zhang Xinran Ren Xi Wang | 2021 | Journal of Materials Science & Technology2021，，13： | 2 |
| 4 | Diafenthiuron residue and decline in pakchoi and soil under field application显示文摘 | Lei Wang Pengyue Zhao Fengzu Zhang Fengpei Du Canping Pan | 2011 | Ecotoxicology and Environmental Safety2011，，： | 1 |
| 5 | DNN-Based Speech Enhancement Using Soft Audible Noise Masking for Wind Noise Reduction显示文摘This paper presents a deep neural network(DNN)-based speech enhancement algorithm based on the soft audible noise masking for the single-channel wind noise reduction. To reduce the low-frequency residual noise, the psychoacoustic model is adopted to calculate the masking threshold from the estimated clean speech spectrum. The gain for noise suppression is obtained based on soft audible noise masking by comparing the estimated wind noise spectrum with the masking threshold. To deal with the abruptly time-varying noisy signals, two separate DNN models are utilized to estimate the spectra of clean speech and wind noise components. Experimental results on the subjective and objective quality tests show that the proposed algorithm achieves the better performance compared with the conventional DNN-based wind noise reduction method. | Haichuan Bai Fengpei Ge Yonghong Yan | 2018 | China Communications2018，15，9： | 1 |
| 6 | Dissipation and residue behavior of emamectin benzoate on apple and cabbage field application显示文摘 | Lei Wang Pengyue Zhao Fengzu Zhang Yanjie Li Fengpei Du Canping Pan | 2011 | Ecotoxicology and Environmental Safety2011，，： | 1 |
| 7 | Quantitative 19FNMR methodvalidation and application to the quantitative analysis of a fluoro-polyphosphates mixture显示文摘 | Wenyi He Fengpei Du Yan Wu | 2006 | Journal of Fluorine Chemistry2006，127，： | 1 |
| 8 | Quantitative 19FNMR method validation and application to the quantitative analysis of a fluoro-polyphosphate mixture 显示文摘 | He Wenyi Du Fengpei Wu Yan | 2006 | J Fluor Chem2006，，： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员