oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 42 )

2018 ( 281 )

2017 ( 302 )

2016 ( 287 )

Custom range...

Search Results: 1 - 10 of 18997 matches for " Guiyun Song "
All listed articles are free for downloading (OA Articles)
Page 1 /18997
Display every page Item
Effects of N rates on N uptake and yield in erect panicle rice  [PDF]
Guiyun Song, Zhengjin Xu, Hengshan Yang
Agricultural Sciences (AS) , 2013, DOI: 10.4236/as.2013.49067
Abstract:

The field experiment was conducted in 2005 and 2006 at Northern Japonica Rice Cultivation and Breeding Research Center, Shenyang Agricultural University,Shenyang, northeast China. Shennong 265 (typical erect panicle rice cultivar), and Liaojing 294 (traditional semi-erect panicle rice cultivar) were grown under different N rates to assess N uptake and N use efficiency. Nitrgen (N) uptake of two rice cultivars increased in their response to N improvement. Grain N of Liaojing 294 predominantly came from root absorption on low N treatments, while grain N of Shennong 265 mainly came from root absorption and had less N re-transferring from vegetative organs under high N rates. Shennong 265 produced less N uptake before heading and more N uptake after heading than Liaojing 294. GY was highly related with N fertilizer rate (r2 = 0.870** for Shennong 265, r2 = 0.613* for Liaojing 294). Shennong 265 was a N-unefficient genotype, since it produced low yield at low N levels and responded well to N application. Liaojing 294 was a N-efficient genotype producing high yield at both low and high N rates. NNG and NFUE exhibited positive correlation with N application rates, but NUEPG showed negative correlation with N application rates; GY as well as BIO and N uses efficiency parameters (TN, NNG, NFUE) which were all positively correlate, while the correlation between GY as well as BIO and the other N efficiency indicators expressed negative correlation. The relationship between GY and TN as well as BIO and TN was observed with significant difference (r2 = 0.824**, r2 = -0.858

Modeling the Effects of Integrating Larval Habitat Source Reduction and Insecticide Treated Nets for Malaria Control
Laith Yakob, Guiyun Yan
PLOS ONE , 2009, DOI: 10.1371/journal.pone.0006921
Abstract: Integrated vector management for malaria control has received a lot of recent interest. Attacking multiple points in the transmission cycle is hoped to act synergistically and improve upon current single-tool interventions based on the use of insecticide-treated bed nets (ITNs). In the present study, we theoretically examined the application of larval habitat source reduction with ITNs in reducing malaria transmission. We selected this type of environmental management to complement ITNs because of a potential secondary mode of action that both control strategies share. In addition to increasing vector mortality, ITNs reduce the rate at which female mosquitoes locate human hosts for blood feeding, thereby extending their gonotrophic cycle. Similarly, while reducing adult vector emergence and abundance, source reduction of larval habitats may prolong the cycle duration by extending delays in locating oviposition sites. We found, however, that source reduction of larval habitats only operates through this secondary mode of action when habitat density is below a critical threshold. Hence, we illustrate how this strategy becomes increasingly effective when larval habitats are limited. We also demonstrate that habitat source reduction is better suited to human populations of higher density and in the presence of insecticide resistance or when the insecticidal properties of ITNs are depleted.
Mid-Holocene climate change in North China, and the effect on cultural development
Guiyun Jin,Dongsheng Liu
Chinese Science Bulletin , 2002, DOI: 10.1360/02tb9095
Abstract: In this study, to reconstruct the paleoclimatic history, pollen and oxygen isotope were analyzed on the 160 samples of a 2.7 m peat core from Taishizhuang, Huailai County, Hebei Province. Combining our data with other information of climate history and archaeology from this area, we found that there is a close linkage between cultural development and the mid-Holocene (6000–3000 cal. aBP) environment changes. The main results and conclusions are presented as the following: The climate during 5678–5400 cal. aBP was unstable and in general colder and drier than today. From 5400 to 4800 cal. aBP the climate was much warmer and wetter than before. The climate during 4800–4300 cal. aBP was persistently cold, with an exceptional cold event occurring at 4600–4300 cal. aBP. This cold event was recorded at several other localities in Northern China even the Northern Hemisphere and played an important role in the cultural development. After the cold event, there was a return to warmer conditions between 4200 and 3300 cal. aBP.
Mid-Holocene climate change in North China, and the effect on cultural development

JIN Guiyun,LIU Dongsheng,

科学通报(英文版) , 2002,
Abstract: In this study, to reconstruct the paleoclimatic history, pollen and oxygen isotope were analyzed on the 160 samples of a 2.7 m peat core from Taishizhuang, Huailai County, Hebei Province. Combining our data with other information of climate history and archaeology from this area, we found that there is a close linkage between cultural development and the mid-Holocene (6000-3000 cal. aBP) environment changes. The main results and conclusions are presented as the following: The climate during 5678-5400 cal. aBP was unstable and in general colder and drier than today. From 5400 to 4800 cal. aBP the climate was much warmer and wetter than before. The climate during 4800-4300 cal. aBP was persistently cold, with an exceptional cold event occurring at 4600-4300 cal. aBP. This cold event was recorded at several other localities in Northern China even the Northern Hemisphere and played an important role in the cultural development. After the cold event, there was a return to warmer conditions between 4200 and 3300 cal.aBP.
A study of the distribution and abundance of the adult malaria vector in western Kenya highlands
Li Li, Ling Bian, Guiyun Yan
International Journal of Health Geographics , 2008, DOI: 10.1186/1476-072x-7-50
Abstract: The models developed using spatial methods outperformed the models developed using non-spatial methods. Houses close to locations where mosquito breeding habitats were repeatedly observed had more abundant adult female mosquitoes. Distance to high-order streams was identified as an effective predictor for the distribution of adult mosquitoes.The spatial method is more effective in modeling the distribution of adult mosquitoes than the non-spatial method. The results of this study can be used to facilitate decision-making related to mosquito surveillance and malaria prevention.The highland areas in Africa rarely experienced malaria before 1988 [1]. However, a series of explosive seasonal malaria outbreaks has occurred in these areas in the last two decades [2]. These outbreaks caused thousands of deaths of which over 70% were children under the age of five, and the highlands in western Kenya have seen the highest mortality rates [3]. Malaria control is urgently needed for the region.Malaria is a vector-borne disease, which is transmitted by mosquito vectors. Understanding the spatial distribution of mosquitoes will contribute to the design of malaria-vector control strategies. Many studies have been carried out to improve the understanding of the spatial distribution of mosquito vectors. For example, elevation, temperature, and shape of landscape have been recognized to be related with the development of mosquito vectors [4-6]. The abundance of mosquitoes in human houses has been found to be affected by rainfall [7]. Humidity also has a significant effect on mosquitoes [8,9]. Host availability has long been recognized to have an influence on the distribution of mosquitoes [10]. The survival of mosquito larvae has also been related to the openness and presence of predatory animals in their habitats [11]. It is also believed that certain human activities, such as the deforestation and cultivation of natural swamps, may have created conditions favorable to mosquitoes in
Modelling knowlesi malaria transmission in humans: vector preference and host competence
Laith Yakob, Michael B Bonsall, Guiyun Yan
Malaria Journal , 2010, DOI: 10.1186/1475-2875-9-329
Abstract: Using a mathematical model, the influence of human host competency on disease transmission is assessed. Adapting a standard model for vector-borne disease transmission and using an evolutionary invasion analysis, the paper explores how differential host competency between humans and macaques can facilitate the epidemiological processes of P. knowlesi infection between different hosts.Following current understanding of the evolutionary route of other human malaria vectors and parasites, an increasing human population in knowlesi malaria endemic regions will select for a more anthropophilic vector as well as a parasite that preferentially transmits between humans. Applying these adaptations, evolutionary invasion analysis yields threshold conditions under which this macaque disease may become a significant public health issue.These threshold conditions are discussed in the context of malaria vector-parasite co-evolution as a function of anthropogenic effects.Although principally a disease of long-tailed and pig-tailed macaques, Plasmodium knowlesi has recently been revealed to be a widespread, and potentially life-threatening, malaria infection of humans in Southeast Asia [1]. However, before the public health threat that this disease poses can be assessed, a solid understanding of the fundamental epidemiological processes is needed. Using a simple mathematical model, key components of the disease are explored that are of particular influence in its transmission and yet for which data are lacking, thereby highlighting priority research areas.Through a series of laboratory experiments, Chin et al demonstrated the ability of this parasite to transmit from humans to both simian and human hosts [2]. However, the extent of human host competency under natural conditions remains unclear, giving rise to controversy over whether P. knowlesi can be classed as the fifth aetiological agent of human malaria [3-5]. Implicit to the epidemiological understanding of this disease is a
OPTICAL FREOUENCY DIFFERENCE MEASUREMENTS USING FREGUENCY SHIFTED FEEDBACK LASER
使用频移反馈激光系统测量光学频率差

Liang Guiyun,
梁桂云

光子学报 , 1995,
Abstract: A noveI technique for measuring optical frequency difference using frequency shifted feedbacklaser is demonstrated.The frequency difference 3.733440GHz between two modes in ND:YLF laserwas measured.An accuracy of ? 5kru was got.
Electron impact collision strengths in Si IX, Si X and Si XI
Guiyun Liang,Gang Zhao,Jiaolong Zeng
Physics , 2006, DOI: 10.1016/j.adt.2006.12.001
Abstract: Electron impact collision strengths among 560 levels of Si IX, 320 levels of Si X and 350 levels of Si XI have been calculated using the Flexible Atomic Code (FAC) of Gu (2003). Collision strengths $\Omega$ at ten scattered electron energies covering an entire energy range, namely 10, 50, 100, 200, 400, 600, 800, 1000, 1500 and 2000 eV, are reported. Assuming a Maxwellian energy distribution, effective collision strengths $\Upsilon$ are obtained at a finer electron temperature grids of 0.5, 1.0, 2.0, 3.0, 4.0, 5.0 and 6.0 MK, which covers the typical temperature range of astrophysical hot plasma. Additionally, radiative rates $A$ and weighted oscillator strengths $gf$ are given for more possible transitions among these levels. Comparisons of our results with available predictions reported in earlier literatures are made, and the accuracy of the data is assessed. Most transitions exhibit a better agreement, whereas large differences in $gf$ appear for a few cases, which are due to the different inclusion of configuration interaction in different theoretical calculations. In excitations among levels of ground and lower excited configurations, large discrepancies of $\Upsilon$ maybe resulted from the consideration of resonance effects in earlier works.
Analysis of Discrete Choice Models: A Welfare-Based Framework
Guiyun Feng,Xiaobo Li,Zizhuo Wang
Mathematics , 2015,
Abstract: Based on the observation that many existing discrete choice models admit a welfare function of utilities whose gradient gives the choice probability vector, we propose a new representation of discrete choice model which we call the welfare-based choice model. The welfare-based choice model is meaningful on its own by providing a new way of constructing choice models. More importantly, it provides great analysis convenience for establishing connections among existing choice models. We prove by using convex analysis theory, that the welfare-based choice model is equivalent to the representative agent choice model and the semi-parametric choice model, establishing the equivalence of the latter two. We show that these three models are all strictly more general than the random utility model, while when there are only two alternatives, those four models are equivalent. In particular, we show that the distinction between the welfare-based choice model and the random utility model lies in the requirement of the higher-order derivatives of the welfare function. We then define a new concept in choice models: substitutability/complementarity between alternatives. We show that the random utility model only allows substitutability between different alternatives; while the welfare-based choice model allows flexible substitutability/complementarity patterns. We argue that such flexibility could be desirable in capturing certain practical choice patterns and expanding the scope of discrete choice models. Examples are given of new choice models proposed under our framework.
RETRACTED:The Results Observation on Adjuvant Chemotherapy with Microwave Hyperthermia and Stereotactic Radiotherapy in Retreated Elderly Patients with Advanced (III/IV Stage) Lung Cancer  [PDF]
Xihao Yu, Xinping Li, Guiyun Dong, Wenyan Yu, Jianping Wang, Ying Xiong
Journal of Computer and Communications (JCC) , 2016, DOI: 10.4236/jcc.2016.43012
Abstract:


Short Retraction Notice

The paper does not meet the standards of \"Computer and Communications\".

This article has been retracted to straighten the academic record. In making this decision the Editorial Board follows COPE's Retraction Guidelines. The aim is to promote the circulation of scientific research by offering an ideal research publication platform with due consideration of internationally accepted standards on publication ethics. The Editorial Board would like to extend its sincere apologies for any inconvenience this retraction may have caused.

Editor guiding this retraction: Ella LIU?(conference department?of JCC)

The full retraction notice in PDF is preceding the original paper, which is marked \"RETRACTED\".



Page 1 /18997
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.