|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Evaluating effective swath width and droplet distribution of aerial spraying systems on M-18B and Thrush 510G airplanes显示文摘Aerial spraying plays an important role in promoting agricultural production and protecting the biological environment due to its flexibility,high effectiveness,and large operational area per unit of time.In order to evaluate the performance parameters of the spraying systems on two fixed wing airplanes M-18B and Thrush 510G,the effective swath width and uniformity of droplet deposition under headwind flight were tested while the planes operated at the altitudes of 5 m and 4 m.The results showed that although wind velocities varied from 0.9 m/s to 4.6 m/s,and the directions of the atomizer switched upward and downward in eight flights,the effective swath widths were kept approximately at 27 m and 15 m for the M-18B and Thrush 510G,respectively,and the latter was more stable.In addition,through analyzing the coefficients of variation(CVs)of droplet distribution,it was found that the CVs of the M-18B were 39.57%,33.54%,47.95%,and 59.04% at wind velocities of 0.9,1.1,1.4 and 4.6 m/s,respectively,gradually enhancing with the increasing of wind speed;the CVs of Thrush 510G were 79.12%,46.19%,14.90%,and 48.69% at wind velocities of 1.3,2.3,3.0 and 3.4 m/s,respectively,which displayed the irregularity maybe due to change of instantaneous wind direction.Moreover,in terms of the CVs and features of droplet distribution uniformity for both airplanes in the spray swath,choosing smaller CV(20%-45%)as the standard of estimation,it was found that the Thrush 510G had a better uniform droplet distribution than the M-18B.The results provide a research foundation for promoting the development of aerial spraying in China. | Zhang Dongyan Chen Liping Zhang Ruirui Xu Gang Lan Yubin Wesley Clint Hoffmann Wang Xiu Xu Min | 2015 | International Journal of Agricultural and Biological Engineering2015，8，2： | 18 |
| 2 | Review of agricultural spraying technologies for plant protection using unmanned aerial vehicle(UAV)显示文摘With changing climate and farmland ecological conditions,pest outbreaks in agricultural landscapes are becoming more frequent,increasing the need for improved crop production tools and methods.UAV-based agricultural spraying is anticipated to be an important new technology for providing efficient and effective applications of crop protection products.This paper reviews and summarizes the status of the current research and progress on UAV application technologies for plant protection,and it discusses the characteristics of atomization by unmanned aircraft application systems with a focus on spray applications of agrichemicals.Additionally,the factors influencing the spraying performance including downwash airflow field and operating parameters are analyzed,and a number of key technologies for reducing drift and enhancing the application efficiency such as remote sensing,variable-rate technologies,and spray drift models are considered.Based on the reviewed literature,future developments and the impacts of these UAV technologies are projected.This review may inspire the innovation of the combined use of big data analytics and UAV technology,precision agricultural spraying technology,drift reduction technology,swarm UAV cooperative technology,and other supporting technologies for UAV-based aerial spraying for scientific research in the world. | Haibo Chen Yubin Lan Bradley K Fritz W.Clint Hoffmann Shengbo Liu | 2021 | International Journal of Agricultural and Biological Engineering2021，14，1： | 4 |
| 3 | Quantitative magnetic resonance imaging of the fetal brain in utero: Methods and applications显示文摘Application of modern magnetic resonance imaging(MRI) techniques to the live fetus in utero is a relatively recent endeavor. The relative advantages and disadvantages of clinical MRI relative to the widely used and accepted ultrasonographic approach are the subject of a continuing debate; however the focus of this review is on the even younger field of quantitative MRI as applied to non-invasive studies of fetal brain development. The techniques covered under this header include structural MRI when followed by quan-titative(e.g., volumetric) analysis, as well as quantita-tive analyses of diffusion weighted imaging, diffusion tensor imaging, magnetic resonance spectroscopy and functional MRI. The majority of the published work re-viewed here reflects information gathered from normal fetuses scanned during the 3rd trimester, with relatively smaller number of studies of pathological samples including common congenital pathologies such as ven-triculomegaly and viral infection. | Anat Biegon Chen Hoffmann | 2014 | World Journal of Radiology2014，6，8： | 3 |
| 4 | A novel detection method of spray droplet distribution based on LIDARs显示文摘During the process of plant protection in agriculture,the distribution and deposition of droplets or fog fields could directly influence the effectiveness and efficiency of spray.The traditional method of measurement of the distribution of droplets mainly used water sensitive papers,glass containers or flour to collect data and inverse results,while a new method of measurement based on the principle of reflection of LIDAR was presented.Droplets were the major targets of the study,and four important algorithms were primarily developed,including the recognition and extraction of targets,the superposition in time-domain,the calculation of effective ranges of distribution,and the development of 3D distribution models.Combined with these algorithms,in order to eliminate the environmental noise,the methods of Fuzzy Environment Matching and Secondary Filter were created and utilized.Meanwhile,the statistics was used for analysis of the duration of scanning as well as computation of the distribution,with enough datasets but the minimum length of time.The results of the experiments showed that the relative error of measurement was less than 7%and Relative Standard Deviation was less than 16%,compared with the values of manual measurement.Furthermore,the 3D models were accurate and clarified in the wind-tunnel experiment.The completed system based on this method could adapt to the requirements of both indoor and outdoor detection.Besides,it is capable of the quantized detection of droplet distribution,providing an effective way of tests for spray technique,especially for the research of the application of plant protection by UAVs. | Zheng Yongjun Yang Shenghui Yubin Lan Clint Hoffmann Zhao Chunjiang Chen Liping Liu Xingxing Tan Yu | 2017 | International Journal of Agricultural and Biological Engineering2017，10，4： | 2 |
| 5 | The Spectrum of Aphasia Subtypes and Etiology in Subacute Stroke显示文摘 | Michael Hoffmann Ren Chen | 2013 | Journal of Stroke and Cerebrovascular Diseases2013，22，8： | 1 |
| 6 | Linking long-termdietary patterns with gut microbial enterotypes 显示文摘 | Wu G D Chen J Hoffmann C | 2011 | Science2011，334，6052： | 1 |
| 7 | Linking long-term dietary patterns with gut microbial enterotypes显示文摘 | Wu GD Chen J Hoffmann C | 2011 | Science2011，334，6052： | 1 |
| 8 | Clq/TNF-related protein 3 (CTRP-3) is secreted by visceral adipose tissue and exerts antiinflammatory and antifibrotic effects in primary human colonic fibroblasts显示文摘 | Hoffmann C Chen N Obermeier F | 2011 | Inflamm Bowel Dis2011，17，12： | 1 |
| 9 | Characterization and comparison of 2 distinct epidemic community-associated methicillin-resistant Staphylococcus aureus clones of ST59 lineage显示文摘 | Chen CJ Unger C Hoffmann W | 2013 | PLo S One2013，8，63： | 1 |
| 10 | Adenovirus-mediated small-interference RNA for in vivo silencing of angiotensin AT1 a receptors in mouse brain显示文摘 | Chen H Hoffmann A | 2006 | Hypertension2006，47，： | 1 |
| 11 | Experimental and numerical-analysis of bimodal acoustic agglomeration 显示文摘 | Hoffmann T L Chen W Koopmann G H Scaroni A W Song L | 1993 | Journal of Vibration and Acoustics-Transactions of the Asme1993，115，3： | 1 |
| 12 | Leiomyosareoma of the breast:a ease of long survival and late hepatic metastasis 显示文摘 | Chen KT Kuo TT Hoffmann KD | 1981 | Cancer1981，47，9： | 1 |
| 13 | Linking long term dietary patterns with gut microbial enterotypes显示文摘 | Wu GD Chen J Hoffmann C | 2011 | Science2011，334，6052： | 1 |
| 14 | The amino acid substitutions rtP177G and rtF249A in the reverse transcriptase domain of hepatitis B virus polymerase reduce the susceptibility to tenofovir显示文摘 | Bo Qin Bettina Budeus Liang Cao Chunchen Wu Yun Wang Xiaoyong Zhang Simon Rayner Daniel Hoffmann Mengji Lu Xinwen Chen | 2013 | Antiviral Research2013，，2： | 1 |
| 15 | Generic Naming in Generative, Constrain based Design 显示文摘 | Capoyleas V Chen X P Hoffmann C M | 1996 | Computer-aided Design1996，28，1： | 1 |
| 16 | Linking long-term dietary patterns with gut microbial enterotypes显示文摘 | Wu GD Chen J Hoffmann C | 2011 | Science2011，334，6052： | 1 |
| 17 | Adenovirus-mediated small-Interference RNA for in vivo silencing of angiotensin AT1a receptors in mouse brain显示文摘 | Chen Y Chen H Hoffmann A | 2006 | Hypertension2006，47，2： | 1 |
| 18 | Linking long-term dietary patterns with gut microbial enterotypes显示文摘 | Wu GD Chen J Hoffmann C | | 0，，6052： | 1 |
| 19 | Expression of carbonic anhydrase 9 at the invasion front of gastric cancers显示文摘 | Chen J Rocken C Hoffmann J | 2005 | Gut2005，54，7： | 1 |
| 20 | Linking long-term dietary patterns with gut microbial enterotypes 显示文摘 | Wu GD Chen J Hoffmann C | 2011 | Science2011，334，6052： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员