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Search Results: 1 - 10 of 128990 matches for " Li Jiao "
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Fast Tracks: A Comparison of High Speed Rail in China, Europe and the United States  [PDF]
Junfeng Jiao, Jenna Harbin, Yuan Li
Journal of Transportation Technologies (JTTs) , 2013, DOI: 10.4236/jtts.2013.32A007
Abstract:

High speed rail systems have blossomed in technological advances since their debut in the 1960’s with the Japanese Shinkansen line. As miles upon miles of tracks increase around the world, bringing added mobility to travelers while decreasing emissions, various technologies are leading the way to a faster tomorrow. This article explores the differences in what countries around the world are using to supply the next generation of travel modes. This paper details the differences in technological implementations from Asia, Europe, and North America. High speed rail systems are far more developed in other countries, especially China, and have required substantial government investment. The United States, with limited HSR development, stands to benefit from the technological advances of others and learn from the economic impacts of HSR in other countries.

A Fast Extraction Method in the Applicaton of UHV Transmission Line Fault Location  [PDF]
Li Wang, Jiale Suonan, Zaibin Jiao
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B242
Abstract:

To aim at the distribution parameter characteristics of UHV transmission line, this paper presents a fast extraction method (FE) to extract the accurate fundamentals of current and voltage from the UHV transmission line transient process, and locates the fault by utilizing two-end unsynchronized algorithm. The simulation result shows that this method has good performance of accuracy and stability, and has better location precision by comparing with results of one cycle Fourier algorithm. Therefore the method can efficiently improve the precision of fault location during the transient process, and makes the error of location results less than 0.5%.

Automatic identification and normalization of dosage forms in drug monographs
Jiao Li, Zhiyong Lu
BMC Medical Informatics and Decision Making , 2012, DOI: 10.1186/1472-6947-12-9
Abstract: As a step toward providing users with integrated access to multiple trustworthy drug resources, we aim to develop a method capable of identifying drug's dosage form information in addition to drug name recognition. We developed rules and patterns for identifying dosage forms from different sections of full-text drug monographs, and subsequently normalized them to standardized RxNorm dosage forms.Our method represents a significant improvement compared with a baseline lookup approach, achieving overall macro-averaged Precision of 80%, Recall of 98%, and F-Measure of 85%.We successfully developed an automatic approach for drug dosage form identification, which is critical for building links between different drug-related resources.Seeking drug-related information is one of the major activities of today's online healthcare professionals and consumers. To date, there are a wide variety of different drug-related resources including but not limited to: the biomedical literature in PubMed? [1], clinical trials in ClinicalTrial.gov [2], adverse drug effects in FDA's Spontaneous Reporting System, and consumer-level drug monographs in MedlinePlus? [3] and PubMed Health [4]. Owing to the heterogeneous nature of each individual resource, they are not currently linked to each other. On the other hand, their contents are often complementary to each other so that users would benefit from an integrated access to all sources relevant to a single drug. Thus, this poses an increasing need to build cross-links between these different resources for the same drug entity so that users from one site can be informed by relevant information in other sites. To this end, a critical step is to be able to identify the drug entity from the corresponding narrative text.Biomedical named entity recognition (NER) is a challenging task but it serves as a prerequisite for many subsequent tasks like relationship extraction [5]. Over the years, most NER tools have been developed for automatically recogni
Tris(nitrato-κ2O,O′)bis[4,4,5,5-tetramethyl-2-(pyridin-2-yl-κN)imidazoline-1-oxyl 3-oxide-κO]holmium(III)
Dong-Jiao Li
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812012445
Abstract: In the title compound, [Ho(NO3)3(C12H16N3O2)2], the HoIII ion is ten-coordinated in a distorted bicapped square-antiprismatic environment by two N,O-bidentate nitronyl nitroxide radical ligands and three O,O′-bidentate nitrate anions. Complex molecules are connected by C—H...O hydrogen bonds into a three-dimensional network.
Anomalous heat conduction and anomalous diffusion in one dimensional systems
Baowen Li,Jiao Wang
Physics , 2003, DOI: 10.1103/PhysRevLett.91.044301
Abstract: We establish a connection between anomalous heat conduction and anomalous diffusion in one dimensional systems. It is shown that if the mean square of the displacement of the particle is $<\Delta x^2> =2Dt^{\alpha} (0<\alpha\le 2)$, then the thermal conductivity can be expressed in terms of the system size $L$ as $\kappa = cL^{\beta}$ with $\beta=2-2/\alpha$. This result predicts that a normal diffusion ($\alpha =1$) implies a normal heat conduction obeying the Fourier law ($\beta=0$), a superdiffusion ($\alpha>1$) implies an anomalous heat conduction with a divergent thermal conductivity ($\beta>0$), and more interestingly, a subdiffusion ($\alpha <1$) implies an anomalous heat conduction with a convergent thermal conductivity ($\beta<0$), consequently, the system is a thermal insulator in the thermodynamic limit. Existing numerical data support our results.
Optimization of reaction for synthesis of polyisobutylene aminebetween amination agent and epoxy polyisobutylene
Jiao Zhen, , Li Henghu
- , 2016, DOI: 10.3969/j.issn.1003-7985.2016.04.019
Abstract: An optimization study on the amination reaction of epoxy polyisobutylene for synthesis of polyisobutylene amine is presented. The experimental results indicate that n-butanol and ethylenediamine are the suitable solvent and amination agents for the reaction, respectively. The reaction yield of the amination reaction is notably increased with the enhanced molar ratio of either n-butanol against epoxy polyisobutylene or ethylenediamine against epoxy polyisobutylene. Also, the yield is enhanced with increasing temperature and time during the experimental range. Strikingly, the yield reaches as high as 91.30% under optimal conditions; with the molar ratio of ethylenediamine, n-butanol and PIBO of 10∶6∶1, the reaction temperature of 150 ℃ and the reaction time of 6 h. In addition, the yield of the reaction is slightly decreased with the enhanced water content of the system. Accordingly, the mass concentration of water should be controlled within 1.7% during the reaction.
Monitoring Mental Fatigue in Analog Space Environment Using Optical Brain Imaging  [PDF]
Xuejun Jiao, Jing Bai, Shanguang Chen, Qijie Li
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.55B011
Abstract: Accurate assessment of mental fatigue level would improve operational safety and efficacy of astronauts for long-term space flight. Identification of neurophysiological markers can index impending overload or fatigue before performance decrements using neuroimaging technologies. The current study utilized functional near-infrared spectroscopy (fNIR) to investigate the relationship of hemodynamic response in prefrontal cortex with changes of mental fatigue level, task performance (reaction time) during n-back working memory task and routine work task in analog space environment. Results indicated that the information entropy of hemodynamic response is related to task performance and subjective self-reported measures; the reaction time is predicted by regression analysis; and the accuracy of mental fatigue classification approaches 90%. Since fNIR is a portable, wearable and minimally intrusive methodology, it has the potential to be deployed in future space environments to monitoring mental fatigue and assessing the effort of operators in field environments.
OFDM Wireless Downhole Transmission Systems and Proposed SLM Method for PAPR Reduction  [PDF]
Renze Luo, Yupu Dang, Rui Li, Jiao Yang
Communications and Network (CN) , 2014, DOI: 10.4236/cn.2014.61002
Abstract:


At present, mud pulse transmission systems are widely used in downhole data transmission. But the systems are very low in transmission efficiency, only 5-10 bits/s, with very large anti-inter-symbol-interference (ISI). It cannot meet high requirements for high-speed transmission of modern logging system. The development of communication technology has laid some foundation for this requirement. For this purpose, the Orthogonal Frequency Division Multiplexing (OFDM) Wireless Downhole Transmission Systems are proposed for the first time because of their high transmission rate, anti-inter-symbol-interference (ISI), and high spectral efficiency, etc. Due to non-linear power amplifier (PA) of logging systems with limited dynamic range, the drawbacks of high peak-average power ratio (PAPR) may outweigh all the potential benefits of OFDM wireless downhole transmission systems. Selective mapping (SLM) method can reduce the PAPR of OFDM logging signals without distortion. But at the receiver, the conventional SLM method needs exact bits of side information (SI) to recover the data signal. The probability of erroneous SI detection has a significant influence on the error performance of the system. And individual transmissions of SI result in the reduction of bandwidth efficiency. To restore the exact data signal, our scheme codes the SI bits by linear block codes (LBC), and is easily decoded by syndrome decoding. And then the coding SI bits are superimposed onto the logging signals to omit SI bits transmission. The theory and simulation results show that the proposed method has better performance than the conventional one. Accordingly, the OFDM wireless downhole transmission systems can tackle the high PAPR problem, and highten the transmission rate of logging signals.


The Adjustment and Effects of Vocabulary Teaching Strategies in Flipped Classroom  [PDF]
Hongwei Zhang, Jie Li, Liping Jiao, Weilian Ma, Chen Guan
Creative Education (CE) , 2016, DOI: 10.4236/ce.2016.714199
Abstract: The importance of vocabulary teaching is self-evident. Yet, the present English vocabulary teaching model is still far more traditional than modern because of the inadequacy of education revolution. The flipped classroom teaching model brings a new horizon to the field of vocabulary teaching. This paper takes the freshmen in the English department of a college in northern part of China as the main body of research analyzes the results of the experimental vocabulary teaching and gets the conclusion that the flipped classroom teaching model promotes English vocabulary teaching outcomes.
Accumulative Effect of Soil Organic Carbon and Nitrogen in Water-Stable Aggregates and Soil Stability Characteristics of Robinia pseudoacacia Plantation in the Loess Hilly-Gully Region  [PDF]
Jiao Sun, Junfeng Li, Gaihe Yang, Wenfang Hao
Open Journal of Soil Science (OJSS) , 2016, DOI: 10.4236/ojss.2016.612019
Abstract: Soil water-stable aggregates (WSAs) are the basic unit of soil constitution and can contribute to remaining the stable soil constitution. The objective of this study was to clarify the distribution and stability of WSAs and the soil organic carbon (SOC), the total nitrogen (TN), and the total phosphorus (TP) concentrations in 0 - 20 cm and 20 - 40 cm soil layers under the different ages of Robinia pseudoacacia plantations. The 20, 25, 40, and 50 years-old Robinia pseudoacacia plantations were selected. Stepwise regression analysis showed that >5 mm and 1 - 2 mm WSAs, SOC concentration in 2 - 5 mm WSAs, and TN and TP concentrations in < 0.25 mm WSAs were dominant independent variables affecting aggregate stability and that SOC in 0.25 - 0.5 mm WSAs, TN in <0.25 mm and 1 - 2 mm WSAs and TP in 2 - 5 mm WSAs were dominant independent variables affecting SOC, TN, and TP concentrations in bulk soils.
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