|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Global overview of research progress and development of precision maize planters显示文摘Maize is the most important crop for food and widely used for industrial materials,leading to its increasing demand all over the world.Precision planting is the effective method to increase maize yield.To meet the agronomic requirement of precision planting,different kinds of precision maize planters were developed.However,because of the difference of geographical environment,cropping system,farm scale and economic status among different countries,types of maize planters are various and the technologies involved are at different levels.This paper summarizes the precision maize planters currently available in the world and classifies them into four types:precision planters for tilled-land,minimum/no tilled-land,hilly&small land,and cold&arid land.Detailed characteristics have been provided for some typical precision planters and comparisons were made as to their suitability under particular working conditions.High-efficiency and high-accuracy are the main features of precision planters for tilled-land,while the ability to clean residue from seed rows and prevent planters to be blocked are the important function of precision planters for minimum/no tilled-land.To fit for hilly&small land,planters should be light-weighted and small-sized,and to warm up soil and keep moisture,planters for cold&arid land should be equipped with plastic-film mulching mechanism.Finally,developing trend of precision planting technology was analyzed and suggestions,including policy support and technical improvement,were made for developing countries to make suitable precision maize planters according to the local geographical conditions and cropping systems. | Yang Li Yan Bingxin Cui Tao Yu Yiming He Xiantao Liu Quanwei Liang Zhijie Yin Xiaowei Zhang Dongxing | 2016 | International Journal of Agricultural and Biological Engineering2016，9，1： | 17 |
| 2 | Design and experimental study of seed precise delivery mechanism for high-speed maize planter显示文摘Aiming at improving the seed spacing uniformity of maize planter at high forward speed,a seed precise delivery mechanism driven by electric motor has been developed and evaluated in laboratory.The mechanism was designed to deliver single seed from seed meter to furrow.Seed’s movement from the seed release point in a seed meter to the seed delivery cavity in the belt was analyzed,the mathematical model of seed movement in the seed precise delivery mechanism was established based on seed delivery time analysis.A mechanical prototype was designed and associated control system was developed.The performance contrast experiment was conducted between a traditional seed tube and newly developed seed precise delivery mechanism,and test results indicated that the qualities of feed index of the seed precise delivery mechanism were higher than those of the traditional seed tube delivery mechanism,and the coefficients of variation of the seed precise delivery mechanism were lower than those of the traditional seed tube delivery mechanism when the forward speed of planter was set at 10 km/h,12 km/h and 14 km/h,respectively.It indicated the seed precise delivery mechanism significantly improved seed spacing uniformity of maize planter compared with the traditional seed tube delivery mechanism. | Quanwei Liu Tao Cui Dongxing Zhang Li Yang Yunxia Wang Xiantao He Mantao Wang | 2018 | International Journal of Agricultural and Biological Engineering2018，11，4： | 4 |
| 3 | Consensus for prevention and management of coronavirus disease 2019 (COVID-19) for neurologists显示文摘Coronavirus disease 2019(COVID‐19)has become a pandemic disease globally.Although COVID-19 directly invades lungs,it also involves the nervous system.Therefore,patients with nervous system involvement as the presenting symptoms in the early stage of infection may easily be misdiagnosed and their treatment delayed.They become silent contagious sources or‘virus spreaders’.In order to help neurologists to better understand the occurrence,development and prognosis,we have developed this consensus of prevention and management of COVID‐19.It can also assist other healthcare providers to be familiar with and recognise COVID-19 in their evaluation of patients in the clinic and hospital environment. | Huijuan Jin Candong Hong Shengcai Chen Yifan Zhou Yong Wang Ling Mao Yanan Li Quanwei He Man Li Ying Su David Wang Longde Wang Bo Hu | 2020 | Stroke & Vascular Neurology2020，5，2： | 3 |
| 4 | Clinical time course of COVID-19, its neurological manifestation and some thoughts on its management显示文摘Coronavirus disease-2019(COVID‐19)has become a global pandemic.COVID-19 runs its course in two phases,the initial incubation phase and later clinical symptomatic phase.Patients in the initial incubation phase often have insidious clinical symptoms,but they are still highly contagious.At the later clinical symptomatic phase,the immune system is fully activated and the disease may enter the severe infection stage in this phase.Although many patients are known for their respiratory symptoms,they had neurological symptoms in their first 1-2 days of clinical symptomatic phase,and ischaemic stroke occurred 2 weeks after the onset of the clinical symptomatic phase.The key is to prevent a patient from progressing to this severe infection from mild infection.We are sharing our experience on prevention and management of COVID-19. | Yifan Zhou Wei Li David Wang Ling Mao Huijuan Jin Yanan Li Candong Hong Shengcai Chen Jiang Chang Quanwei He Mengdie Wang Bo Hu | 2020 | Stroke & Vascular Neurology2020，5，2： | 2 |
| 5 | Comparability in geomorphic evolution of the three rivers in the northern Longitudinal Range-Gorge Region: Evidence of statistic relationships between geomorphic parameters and analyses of cause of formation显示文摘 | WANG Suiji WU Shaohong HE Daming DAI Erfu ZHOU Changhai WEI Quanwei | 2006 | Chinese Science Bulletin2006，51，B11： | 2 |
| 6 | Effect of travel speed on seed spacing uniformity of corn seed meter显示文摘Both seeding performance of seed metering unit and travel speed of seed planter have significant effects on seeding quality,thereby affecting crop growth and yields.In order to determine the effects of different travel speeds on seed spacing uniformity,four different types of seed meters were evaluated at five different travel speeds on seed meter test bench and in field.The tested seed meters included a finger pickup seed meter,a scoop-wheel seed meter,an air-pressure type seed meter and an air-blowing type seed meter.The seeding performance of the horizontal distribution of seeds within a row was described by using the coefficient of variation,the quality of feed index,the multiple index and the miss-seeding index.Experiments were performed in laboratory and field,respectively.Results indicated that different travel speeds have statistically significant effects on seed spacing uniformity.The four types of seed meters performed better on the seed meter test bench than in the field.Coefficient of variation increases and quality of feed index decreases as the travel speed of seed planter increases.The best seed spacing uniformity was obtained with the air-pressure type seed meter,followed with the air-blowing type seed meter,the finger pickup seed meter and the scoop-wheel seed meter.There were considerable differences between the performances of the scoop-wheel seed meter in the bench test and field test;the seeding qualities were much better in the bench test than in the field test.The scoop-wheel seed meter is more sensitive to vibration than the other types of seed meters. | Liu Quanwei He Xiantao Yang Li Zhang Dongxing Cui Tao Qu Zhe Yan Bingxin Wang Mantao Zhang Tianliang | 2017 | International Journal of Agricultural and Biological Engineering2017，10，4： | 2 |
| 7 | A Chan–Vese Model Based on the Markov Chain for Unsupervised Medical Image Segmentation显示文摘The accurate segmentation of medical images is crucial to medical care and research;however, many efficient supervised image segmentation methods require sufficient pixel level labels. Such requirement is difficult to meet in practice and even impossible in some cases, e.g., rare Pathoma images. Inspired by traditional unsupervised methods, we propose a novel Chan–Vese model based on the Markov chain for unsupervised medical image segmentation. It combines local information brought by superpixels with the global difference between the target tissue and the background. Based on the Chan–Vese model, we utilize weight maps generated by the Markov chain to model and solve the segmentation problem iteratively using the min-cut algorithm at the superpixel level.Our method exploits abundant boundary and local region information in segmentation and thus can handle images with intensity inhomogeneity and object sparsity. In our method, users gain the power of fine-tuning parameters to achieve satisfactory results for each segmentation. By contrast, the result from deep learning based methods is rigid.The performance of our method is assessed by using four Computerized Tomography(CT) datasets. Experimental results show that the proposed method outperforms traditional unsupervised segmentation techniques. | Quanwei Huang Yuezhi Zhou Linmi Tao Weikang Yu Yaoxue Zhang Li Huo Zuoxiang He | 2021 | Tsinghua Science and Technology2021，26，6： | 1 |
| 8 | ADVISING score:a reliable grading scale based on injury and response for intracerebral haemorrhage显示文摘Background Intracerebral haemorrhage(ICH)is the most devastating form of stroke causing high morbidity and mortality.We aimed to develop a novel clinical score incorporating multisystem markers to predict functional dependence at 90 days after ICH.Methods We analysed data from Chinese Cerebral Hemorrhage:Mechanism and Intervention study.Multivariable logistic regression analysis was used to identify the factors associated with 90-day functional dependency(the modified Rankin Scale≥3)after ICH and develop the ADVISING scoring system.To test the scoring system,a total of 2111 patients from Hubei province were included as the training cohort,and 733 patients from other three provinces in China were included as an external validation cohort.Results We found nine variables to be significantly associated with functional dependency and included in the ADVISING score system:age,deep location of haematoma,volume of haematoma,National Institutes of Health Stroke Scale,aspartate transaminase,international normalised ratio,neutrophil-lymphocyte ratio,fasting blood glucose and glomerular filtration rate.Individuals were divided into 12 different categories by using these nine potential predictors.The proportion of patients who were functionally dependent increased with higher ADVISING scores,which showed good discrimination and calibration in both the training cohort(C-statistic,0.866;p value of Hosmer-Lemeshow test,0.195)and validation cohort(C-statistic,0.884;p value of Hosmer-Lemeshow test,0.853).The ADVISING score also showed better discriminative performance compared with the other five existing ICH scores(p<0.001).Conclusions ADVISING score is a reliable tool to predict functional dependency at 90 days after ICH. | Yan Wan Hongxiu Guo Shaoli Chen Jiang Chang David Wang Rentang Bi Man Li Ke Shi Zhaowei Wang Daokai Gong Jingwen Xu Quanwei He Bo Hu | 2023 | Stroke & Vascular Neurology2023，8，2： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员