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Articles by Lin Li
Total Records ( 11 ) for Lin Li
  Lin Li , Shi Qiao and ShiliXiong
  Accompanied by the gradual integration of the microblogging in life, people would like to focus on the subjects they are interested in so that the technique of microblog retrieving becomes more and more popular. Currently, the engine of microblog retrieval uses list-view to show the retrieval results. Although considering the forwarding account and comment time it is still inconvenience for users to know the retrieval content in generally. This study puts forward the method that we organize the results according to the topic threads in order to improve the quality of microblog retrieval. Firstly, we made some earlier stage processing to the microblogs and then we gave out the Manual Sampling based Dynamic Incremental Clustering Algorithm. Finally we utilized the algorithm to extract the topic thread and show the result to the users. The data source is from Sina Weibo and it contains 14 topics and 74662 microblogs in total. The results show that, the algorithm is effective. Compared with the traditional k-means clustering it is 5 times faster and its precision is near.
  Chong Liu , Xiao-Quan Yang , Ijaz Ahmad , Chuan-He Tang , Lin Li , Jian-Hua Zhu and Jun-Ru Qi
  Steady shear and dynamic oscillatory measurements were used to investigate the effect of concentration, ionic strength and thermal treatment on rheological properties of soybean β-conglycinin in aqueous dispersions. SDS-PAGE and Differential Scanning Calorimetry (DSC) showed that β-conglycinin exhibited partial denaturation and formation of aggregates during isolation. Under steady shear flow, strong shear-thinning behavior was observed with increasing shear rate from 0.001 to 1200 s-1. A dispersion of β-conglycinin (≥5% w/v, without applying thermal treatment) exhibited gel-like dynamic mechanical spectra at 20°C. This suggested that β-conglycinin in aqueous dispersions showed rheological properties of typical weak gel-like (entanglement) or semi diluted polymeric solution. Weak gel network of β-conglycinin was susceptible to ionic strength, suggesting that electrostatic forces play an important role in the formation of weak gel network. These properties of β-conglycinin have practical significance for the food processors in the formulation of new products.
  Tingting Zhang , Anning Huang , Jinnian Li , Xueqin Liu , Lin Li , Lu Yao , Ying Huang and Wenping Wang
  Enterotoxigenic Staphylococcus aureus is a main cause of Staphylococcal Food Poisoning (SFP). Here, researchers characterized the antimicrobial resistance, distribution and expression of enterotoxin genes of 41 Methicillin-Resistant S. aureus (MRSA) isolated from bovine mastitis milk and SFP cases. Apart from three SFP-acquired isolates which could produce extended-spectrum β-lactamases, all the others carried mecA gene and expressed the penicillin-binding protein 2a. The 92.7% of MRSA isolates tested showed twenty two multi-drug resistant patterns among which SFP-acquired isolates had higher resistant rate and the MIC50/90 values of cefotaxime, amikacin, azithromycin, ciprofloxacin and gentamicin than those of milk-acquired isolates. The 95.1% of MRSA isolates carried at least one Staphylococcal Enterotoxins (SEs) gene and could produce the corresponding classical SEs, the differences in the prevalence of enterotoxigenic MRSA observed between milk-acquired and SFP-acquired isolates were not statistically significant. Six SEs genotypes were found, among which the genotypes sea-seg-sei-seln-selm and sea-seb-sec-seg-sei-seln-selm predominated, respectively in milk-acquired and SFP-acquired isolates.
  Lin Li and Cibo Zhou
  Demotivation, as the detrimental forces impeding second language acquisition, has unveiled its diverse appearances to EFL learners worldwide. Based on the reviewing of previous research and a 40-item questionnaire survey, this study investigated 97 Chinese and 101 Korean college EFL learners to reveal the demotivators that degraded subjects’ drive and efficacy in L2 learning. As a result, six demotivators were extracted from Chinese subjects and five from Korean counterparts. By comparing the shared and discrepant demotivators between the two subject groups, some noticeable findings stood out for discussion. Shared by both sides were the diminishing role of teachers, the high attribution of confidence deficiency and the increasing proportion of internal demotivators. Two demotivators were unique to Chinese subjects, including learning strategy deficiency and the negative attitude toward target language/culture. Peer pressure was the only demotivator proper to the Koreans. Consequently, a number of possible inducements were sought to explain the highly culture-specific features of demotivators as shown in this study, involving ethnic philosophy, native culture/language and educational settings. Accompanying the inducements, suggestions were made to minimize demotivation or facilitate remotivation.
  KunHao Tang , Luo Zhong , Lin Li and Guang Yang
  Along with the construction of intelligent city accelerates, the popularity of wireless intelligent device, the data we can collected increase exponentially. In terms of Intelligent tunnel, this study collects the noise pollution of real-time data, by comparing the advantages and disadvantages between the traditional clustering k-means algorithm and traditional Clara clustering algorithm and proposes a cleaning for improved data optimization algorithm based on randperm function, called RICA, in order to improve accuracy and reduce the running time as the first target. Random functions of the algorithm proposed is effective for tunnel internal moment change circulation of large amount of data to make corresponding changes. The experimental results show that among the same set of data, the algorithm has shortened the time ,increased the cyber average phase and accuracy effectively, so that it is a reliable and improved method for data processing.
  Lin Li and Beibei Mao
  The financial crisis triggered by the U.S. subprime crisis has shown the great harm of the excessive development of virtual economy. With the acceleration of market-oriented process, the virtual economy has also developed rapidly. When the development of fictitious economy are in well excess of the development of real economy, economic bubbles can be generated during the deviation between the fictitious and real economy. Once the ever-ballooning bubbles burst, the whole society would suffer from the breakdown of credit chain and the collapse of credit system, triggering financial crisis or economic crisis, thus jeopardize the development of real economy. Based on the comparisons of the indicators like stock index, Financial Interrelations Ratio and GDP after domestic market-oriented reform, this study has analyzed the changes of domestic fictitious and real economy, drawn lessons from both domestic and foreign researchers, explored the moderation between China’s fictitious and real economy and proposed corresponding policies according to the real situations.
  Lin Li
  Amid the mainstream of acclamation, the ‘dark side’ of integrating Information Communication Technologies (ICT) into English as a Foreign Language (EFL) classroom has been rarely explored. Therefore, this study investigated Chinese college English learners’ demotivation in a WebQuests-based language classroom. By studying 217 Chinese college EFL learners in a 50-item questionnaire survey, together with literature review of both WebQuests and demotivational theory, this essay proved the existence and identified the triggers of demotivation in WebQuests-based EFL contexts. The triggers revealed were Internal Demotivating Factors, Teachers’ Role, Ill-defined Setting and Peer Pressure. Meanwhile, some correlative learner differences, including gender, major and learning experience, had been tested, revealing significant discrepancies and similarities between the different individual variables. In the comparative study of gender difference, the demotivators shared by both genders were The Teacher, Information and References, Course Design and Learner-self, whereas Peers’ Influence for male participants and Inadequate Facilities for females respectively. Accompanying the study, suggestions are provided for college EFL practitioners to reflect on their pedagogy and minimize learners’ demotivation in WebQuests-based EFL contexts.
  Cheng-Jian Zheng , Lin Li , Jing-ping Zou , Ting Han and Lu-Ping Qin
  Context: Endophytic fungi are microorganisms living within the tissues of host plants, and have proven to be rich sources of biologically active secondary metabolites and therefore have attracted increasing attention in recent years. Objective: To isolate and characterize bioactive constituents from the endophytic fungus cultures of Crocus sativus Linn. (Iridaceae). Materials and methods: Endophytes were isolated from the corm of C. sativus. Endophytic fungus cultures were subjected to repeated column chromatography. Chemical structure was elucidated based on extensive spectroscopic methods and X-ray diffraction analysis. Several pathogenic fungi isolates and tumor cell lines were employed to evaluate the antifungal and cytotoxic activities of the isolated compound. Results: An isolate of Penicillium vinaceum (strain no. X17) was obtained from the corm of C. sativus. Chemical investigations of the endophyte culture broth afforded an unique quinazoline alkaloid (1), identified as (-)-(1R,4R)-1,4-(2,3)-indolmethane-1-methyl-2,4-dihydro-1H-pyrazino-[2,1-b]-quinazoline-3,6-dione, which showed cytotoxic (IC50 range 40.55-76.83 μg/mL) and antifungal (MIC80 range 16-64 μg/mL) activities. Discussion and conclusions: Endophytes in C. sativus can be a rich source of novel bioactive compounds, which prompts us to expand the medicinal resource of this valuable plant in another way. Compound 1 exhibited potential cytotoxic and antifungal activities and may be considered a lead compound for promising antifungal and anticariogenic agent.
  Tao Liu , Lin Li and Jingkun Yu
  A sulfur sensor Mo|Mo, Mo2S3|ZrS2 + MgS|ZrO2(MgO)|ZrS2 + MgS|[S]Fe|Mo was developed and tested in carbon-saturated liquid iron. The auxiliary electrode was ZrS2 + MgS, which was formed on the surface of ZrO2(MgO) electrolyte by: ZrO2(MgO)(s) + 3H2S(g) = ZrS2(s) + MgS(s) + 3H2O(g). The results indicate that the auxiliary electrode is dense, and has a good adhesion to the solid electrolyte. ZrS2 and MgS are stable in the carbon-saturated liquid iron where the aO < 1.25 x 10–7 at 1550 K and aO < 2.10 x 10–7 at 1600 K. The variations of the EMF versus [wt% S] can be obtained as follows:

E=–65.48 ln[wt% S]+134.42 (1550 K)

E=–81.18 ln[wt% S]+111.66 (1600 K)
  The National Institute for Occupational Safety and Health (NIOSH) developed a standard for respirator certification under 42 CFR Part 84, using a TSI 8130 automated filter tester with photometers. A recent study showed that photometric detection methods may not be sensitive for measuring engineered nanoparticles. Present NIOSH standards for penetration measurement are mass-based; however, the threshold limit value/permissible exposure limit for an engineered nanoparticle worker exposure is not yet clear. There is lack of standardized filter test development for engineered nanoparticles, and development of a simple nanoparticle filter test is indicated. To better understand the filter performance against engineered nanoparticles and correlations among different tests, initial penetration levels of one fiberglass and two electret filter media were measured using a series of polydisperse and monodisperse aerosol test methods at two different laboratories (University of Minnesota Particle Technology Laboratory and 3M Company). Monodisperse aerosol penetrations were measured by a TSI 8160 using NaCl particles from 20 to 300nm. Particle penetration curves and overall penetrations were measured by scanning mobility particle sizer (SMPS), condensation particle counter (CPC), nanoparticle surface area monitor (NSAM), and TSI 8130 at two face velocities and three layer thicknesses. Results showed that reproducible, comparable filtration data were achieved between two laboratories, with proper control of test conditions and calibration procedures. For particle penetration curves, the experimental results of monodisperse testing agreed well with polydisperse SMPS measurements. The most penetrating particle sizes (MPPSs) of electret and fiberglass filter media were ~50 and 160nm, respectively. For overall penetrations, the CPC and NSAM results of polydisperse aerosols were close to the penetration at the corresponding median particle sizes. For each filter type, power-law correlations between the penetrations measured by different instruments show that the NIOSH TSI 8130 test may be used to predict penetrations at the MPPS as well as the CPC and NSAM results with polydisperse aerosols. It is recommended to use dry air (<20% RH) as makeup air in the test system to prevent sodium chloride particle deliquescing and minimizing the challenge particle dielectric constant and to use an adequate neutralizer to fully neutralize the polydisperse challenge aerosol. For a simple nanoparticle penetration test, it is recommended to use a polydisperse aerosol challenge with a geometric mean of ~50nm with the CPC or the NSAM as detectors.
  Meike Doebber , Enrica Bordignon , Johann P. Klare , Julia Holterhues , Swetlana Martell , Nadine Mennes , Lin Li , Martin Engelhard and Heinz-Jurgen Steinhoff
  HAMP domains (conserved in histidine kinases, adenylyl cyclases, methyl-accepting chemotaxis proteins, and phosphatases) perform their putative function as signal transducing units in diversified environments in a variety of protein families. Here the conformational changes induced by environmental agents, namely salt and temperature, on the structure and function of a HAMP domain of the phototransducer from Natronomonas pharaonis (NpHtrII) in complex with sensory rhodopsin II (NpSRII) were investigated by site-directed spin labeling electron paramagnetic resonance. A series of spin labeled mutants were engineered in NpHtrII157, a truncated analog containing only the first HAMP domain following the transmembrane helix 2. This truncated transducer is shown to be a valid model system for a signal transduction domain anchored to the transmembrane light sensor NpSRII. The HAMP domain is found to be engaged in a "two-state" equilibrium between a highly dynamic (dHAMP) and a more compact (cHAMP) conformation. The structural properties of the cHAMP as proven by mobility, accessibility, and intra-transducer-dimer distance data are in agreement with the four helical bundle NMR model of the HAMP domain from Archaeoglobus fulgidus.
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