oalib

OALib Journal期刊

ISSN: 2333-9721

费用:99美元

投稿

时间不限

2018 ( 3 )

2017 ( 302 )

2016 ( 404 )

2015 ( 4066 )

自定义范围…

匹配条件: “ Xin Wang ” ,找到相关结果约127001条。
列表显示的所有文章,均可免费获取
第1页/共127001条
每页显示
Mechanical Pressure, Not Genes, Makes Ovulate Parts Leaf-Like in Cycas  [PDF]
Xin Wang, Bin Luo
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.412A1008
Abstract:

The so-called “megasporophylls” of Ginkgoales, Coniferales, and Gnetales have been proven metamorphosed shoots, making “megasporophyll” of Cycas the last one resembling a leaf. Why and how it is so in Cycas (the most ancient seed plant dated back to the Palaeozoic) become key questions because their answers are hinged with the fates of several hypotheses in botany. Here, we performed a controlled developmental experiment on the ovulate parts (megasporophylls) in a single strobilus of Cycas sexseminifera. By removing the neighboring ones, two of the ovulate parts were left isolated spatially from others, in contrast to others left intact. A half-year-long continuous observation indicates that the isolated ovulate parts change their ovule arrangement from initial pinnate into helical pattern, while the intact ones in the same strobilus remain pinnate as usual. Since all ovulate parts are in the same strobilus and controlled by the same genome in this case and the only difference is lack of pressure from neighbors for the isolated ones, the changes in ovule orientation and ovulate part morphology can only be attributed to the lack of mechanical pressure among the ovulate parts. Therefore,

Recognition of Welding Defects in Radiographic Images by Using Support Vector Machine Classifier
Xin Wang
Research Journal of Applied Sciences, Engineering and Technology , 2010,
Abstract: Radiographic testing method is often used for detecting defects as a non-destructive testing method. In this paper, an automatic computer-aided detection system based on Support Vector Machine (SVM) was implemented to detect welding defects in radiographic images. After extracting potential defects, two group features: texture features and morphological features are extracted. Afterwards SVM criteria and receiver operating characteristic curves are used to select features. Then Top 16 best features are used as inputs to a designed SVM classifier. The behavior of the proposed classification method is compared with various other classification techniques: k-means, linear discriminant, k-nearest neighbor classifiers and feed forward neural network. The results show the efficiency proposed method based on the support vector machine.
Designing the Tourism Destination Image Based on the experimentation: a Case from Xining Area
WANG Xin
Journal of Chongqing Normal University , 2010,
Abstract: A number of reports on the design of tourism destination image from various perspectives in recent decades have been published and these valuable studies make great contributions to the field of local tourism planning as to promote the tourism economic growth. Among of them, however, most focus on the academic discussions based on their own rational and superficial understandings and few of them take the tourists’ receptivity into consideration. This paper attempts to propose a new method combining the academic viewpoints and experiment investigations to study the destination image designing processes. The new method pays much more attention on the conception of tourists on the destination. This paper studies the tourism destination images by using the new method and the main goal is to test the attitudes of tourists towards the tourism destinations in the three stages of ideal image, conceptional image and visual image. In addition, the paper designs the tourism images and proposed the strategies for further tourism development of the destinations according to the tourist images and attitudes. On these bases, the present paper studies the tourism image and recommended some measures on the sound and fast tourism development for the case area.
Semantic Comparison Between Chinese and English Idioms Containing Color Words
Xin WANG
Canadian Social Science , 2012, DOI: 10.3968/2915
Abstract: Idiom is the crystallization of the thought which coagulates through the long-term practice and people’s cognition, reflecting their wisdom. Because of the richness of language, there are a number of idioms which contain color words in both English and Chinese. Color idiom is an important part in these two languages. This paper analyzes such idioms containing three representative color words in both English and Chinese and basing on that, it discusses their semantic similarities and differences. The purpose is to help language learners use idioms properly and improve their language communicative ability. Key words: Idioms; Color words; Semantics; Similarities; Differences
The Content Security Mechanism of Smart TV Broadcasting Operating System  [PDF]
Xin Wang
Open Access Library Journal (OALib Journal) , 2015, DOI: 10.4236/oalib.1102030
Abstract: Smart TV broadcasting system is an extensively deployed application which charges users based on their subscription. In Smart TV broadcasting service environments, services providers charge subscription fee by scrambling the programs in CAS. This technique abstain unauthorized televiewers to watch and receive the program. Smart TV malware presents significant threat to Homeland Security. Security for contents running on smart TV terminals is important. As a new smart TV operating system, SMART TV OS offers great flexibility not only for users but also for application developers. However, this flexibility exposes users to additional security threats. This is particularly dangerous for finance and healthcare applications which require high security for sensitive information and transactions. In this paper, we present the security mechanism of DCAS and the technology realization in SMART TV OS, a complete content protection system from headend to terminal. It has all managements and authorization control functions of traditional CA, supporting DCAS terminal and traditional CA simultaneously.
On the Interpretation of Fossil Nuclei  [PDF]
Xin Wang
Natural Science (NS) , 2016, DOI: 10.4236/ns.2016.85025
Abstract: Although organelle preservation in plant fossils is not novel and well-preserved plant mesofossils have contributed greatly to the understanding of plant evolution, subcellular structures are still a rarity in plant mesofossils. Although it is not easy to explore subcellular structures in plant fossils, related attempts are frequently seen. Among them, some false interpretation requires further inspection. To shed more light on this issue, here I studied Cretaceous charcoalified mesofossils from USA, using LM (light microscopy), SEM (scanning electron microscopy) and TEM (transmission electron microscopy) technologies. My conclusion shows that not all publications reflect the truthful existence of nuclei in plant fossils, and this study may provide a reference for the future research.
A Biased, Misleading Review on Early Angiosperms  [PDF]
Xin Wang
Natural Science (NS) , 2017, DOI: 10.4236/ns.2017.912037
Abstract: A recently published review by Herendeen?et al.?is misleading, self-centered, self-praising, and self-conflicting. They excluded the famous early angiosperm?Archaefructus?from their list of exemplar angiosperms, which contained only fossil plants they published themselves, leaving the impression that they were only authoritative on the origin and early history of angiosperms. Their 57-year-old “No Angiosperms Until the Cretaceous” conception does not reflect the truth about the origin and early history of angiosperms. Reinforcing such vapidly repeated statement does not help resolving any problem in science but leads to no solution for the origin of angiosperms. The authors tried to establish a criterion identifying a fossil angiosperm but their own exemplar angiosperm?Monetianthus?overturns their own criterion. Apparently, such a review does not positively contribute much to science.
On the Optimization of Real Time Performance of Software Defined Radio on Linux OS  [PDF]
Zhen Wang, Limin Xiao, Xin Su, Xibin Xu, Xin Qi
Communications and Network (CN) , 2013, DOI: 10.4236/cn.2013.53B2054
Abstract: With the evolution of the communication standards, Software Defined Radio (SDR) is faced with an increasingly important problem to balance more and more complex wireless communication algorithms against relatively limited processing capability of hardware. And, the competition for computing resources exacerbates the problem and increases time-delay of SDR system. This paper presents an integrated optimization method for the real-time performance of SDR on Linux OS (operating system). The method is composed of three parts: real-time scheduling policy which ensures higher priority for SDR tasks, CGROUPS used to manage and redistribute the computing resources, and fine-grade system timer which makes the process preemption more accurate. According to the experiments, the round-trip data transfer latency decreases low enough to meet the requirement for TD-SCDMA via the application of the method.
Research on the Relationship among Government Regulations, Strategy Preference and Manufacturing Performance  [PDF]
Fa-Xin Cheng, Wei Wang
Journal of Service Science and Management (JSSM) , 2012, DOI: 10.4236/jssm.2012.51005
Abstract: Based on the environment-strategy-performance paradigm, the paper constructs a theoretical framework on the rela- tionship among government regulations, manufacturing strategy and performance. Using structural equation model and a sample of 135 SME of Jiangsu Province, this paper examines the relationship among government regulations, manu- facturing strategy and performance, the result of which shows that government regulations have a significant positive effect on cost, quality and innovation; cost, quality and innovation influence financial performance significantly and positively; quality and innovation have a significant positive effect on non-financial performance, whereas cost has not. Finally, suggestions for SME-development promoting policy and manufacturing strategy selection are putting forward.
Fast CR-SRAM Using New Charge-Recycling Scheme  [PDF]
Leilei Li, Xin Chen, Xu Wang
Engineering (ENG) , 2012, DOI: 10.4236/eng.2012.48064
Abstract: In this paper, a CR-SRAM using new charge recycling scheme is described, novel bit-line pre-charge voltage distribution is proposed. The SRAM pre-charge voltage level is designed by logarithm instead of linear. The new design leads to improvement in speed compared to the original CR-SRAM. Simulation results show that the new CR-SRAM using novel pre-charge voltage distribution scheme reduced the write access time by 34% with 9% power dissipation penalty.
第1页/共127001条
每页显示


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