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Search Results: 1 - 10 of 120104 matches for " Baofeng Wang "
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Safety characteristics of Li-ion batteries evaluated byin situ measurement techniques
Li Yang,Baofeng Wang,Yali Qiu
Chinese Science Bulletin , 2005, DOI: 10.1007/BF03183648
Abstract: Li-ion batteries hold an important place in the field of high power batteries because of their high open circuit voltage and associated high energy density. However, the safety is less satisfactory; therefore, the study of the factors that affect the safety of Li-ion batteries has much meaning to the safety design. In this paper, a set of apparatus was developed forin situ measurements, and several commercial materials including electrolyte, separator and electrode materials for Li-ion batteries were investigated by thein situ method. The results showed: 1) The electrolyte vapor pressure is influenced significantly by the component with low boiling point and increases rapidly with the increasing of temperature; 2) the shutdown of separator occurs at around 135°C and the impedance increases approximately by two orders of magnitude; 3) carbon anode materials affect the most the volume changes of the cell, and the change for a graphite anode is much greater than that of a glassy carbon anode.
Variance-Constrained Robust Estimation for Discrete-Time Systems with Communication Constraints
Baofeng Wang,Ge Guo,Xiue Gao
Mathematical Problems in Engineering , 2014, DOI: 10.1155/2014/980753
Abstract: This paper is concerned with a new filtering problem in networked control systems (NCSs) subject to limited communication capacity, which includes measurement quantization, random transmission delay, and packets loss. The measurements are first quantized via a logarithmic quantizer and then transmitted through a digital communication network with random delay and packet loss. The three communication constraints phenomena which can be seen as a class of uncertainties are formulated by a stochastic parameter uncertainty system. The purpose of the paper is to design a linear filter such that, for all the communication constraints, the error state of the filtering process is mean square bounded and the steady-state variance of the estimation error for each state is not more than the individual prescribed upper bound. It is shown that the desired filtering can effectively be solved if there are positive definite solutions to a couple of algebraic Riccati-like inequalities or linear matrix inequalities. Finally, an illustrative numerical example is presented to demonstrate the effectiveness and flexibility of the proposed design approach. 1. Introduction State estimation has long been a significant interesting problem in the control and information fields. In recent years, with technological advances in MEMS, DSP capabilities, computing, and communication technology, networked control systems (NCSs) are built massively, in which sensors, actuators, and controllers are not physically collocated [1, 2]. Hence, there are various uncertainties caused by limited communication capacity when exchanging information via a digital communication network [3–5]. With NCSs becoming more and more popular in various applications, state estimation problem with limited communication capacity has attracted recurring interests. Generally, there are three important issues that should be addressed for communication-based systems, that is, signal transmission delay, packet loss, and quantization effect. For example, the packet loss has been described by the binary Bernoulli distribution approach [6, 7] as well as Markovian jump approach [8], packet delay has been investigated as constant delay [9] and bounded delay [5] along with unbounded packet delay [10], and the quantization has been dealt with via a sector bound approach where the quantization errors are regarded as a class of uncertainties [11]. However, the aforementioned pieces of literature still suffer from some limitations such as the fact that most results only investigate one or two aspects of the communication issues
Computer Use among Different Gender Medical Students in Inner Mongolia Medical University in China  [PDF]
Lan Wang, Zhuang Su, Baofeng Chi, Ying Yang, Chengcheng Yin, Jiao Zhou, Yuan Xia, Juan Sun
Open Journal of Epidemiology (OJEpi) , 2016, DOI: 10.4236/ojepi.2016.61004
Abstract: Objective: The purpose of this study was to evaluate the difference of computer use and the negative effects for different gender in the Medical University of Inner Mongolia. Methods: A cross-sectional census was conducted on medical students on campus in 2013. Descriptive results were expressed as percentage, prevalence and means ± S.D. Gender differences of using computer time and using computer purpose for male and female students were analyzed by chi-square test. Results: Students using computer more than three hours per day had higher headache prevalence and poor academic performance prevalence than that less than three hours per day. The prevalence of male students using computer more than three hours per day was significantly higher than female students (x2 = 72.92, p < 0.001). The prevalence of male students using computer for playing games was more than 3 times higher than female students (50.2% vs 16.1%, x2 = 783.70, p < 0.001). Conclusion: Using computer for long time brings more students headache and poor academic performance. These results suggest that using computer time reasonably and learning efficiently among university students are necessary, especially for male.
A solute-binding protein for iron transport in Streptococcus iniae
Lili Zou, Jun Wang, Baofeng Huang, Mingquan Xie, Anxing Li
BMC Microbiology , 2010, DOI: 10.1186/1471-2180-10-309
Abstract: An ABC transporter system, named as mtsABC (metal transport system) was cloned from S. iniae HD-1, and was found to be involved in heme utilization. mtsABC is cotranscribed by three downstream genes, i.e., mtsA, mtsB, and mtsC. In this study, we cloned the first gene of the mtsABC transporter system (mtsA), and purified the corresponding recombinant protein MtsA. The analysis indicated that MtsA is a putative lipoprotein which binds to heme that can serve as an iron source for the microorganism, and is expressed in vivo during Kunming mice infection by S. iniae HD-1.This is believed to be the first report on the cloning the ABC transporter lipoprotein from S. iniae genomic DNA. Together, our data suggested that MtsA is associated with heme, and is expressed in vivo during Kunming mice infection by S. iniae HD-1 which indicated that it can be a potential candidate for S. iniae subunit vaccine.Streptococcus iniae (S. iniae) is a hemolytic Gram-positive coccus that is a major pathogen of culture fish. It has been associated with disease outbreak in several species of freshwater and marine fish cultured worldwide, including tilapia [1,2], barramundi [3], channel catfish [4], hybrid striped bass [1,5], Japanese flounder [6,7], olive flounder [8], rabbitfish [9], and rainbow trout [9,10]. Streptococcal infection can lead to serious symptoms such as meningoencephalitis and generalized septicaemia with high mortality rates of up to 50% [9,11]. S. iniae is also known to be an opportunistic pathogen that can cause fulminant soft tissue infection in humans, such as bacteremic cellulitis, septicarthritis, and endocarditis [12]. Identifying potential virulence determinants of streptococcal infection will eventually help to the control and eradication of the disease.Iron plays a significant role in many biological processes and is vital for several metabolic processes. Moreover, many proteins such as cytochromes and tricarboxylic acid metalloenzymes use iron as a cofactor [13]. I
Electrochemical behavior of aluminum foil in 1-alkyl-3-methylimidazolium tetrafluoroborate ionic liquids electrolytes
Chengxin Peng,Li Yang,Baofeng Wang,Zhengxi Zhang,Nan Li
Chinese Science Bulletin , 2006, DOI: 10.1007/s11434-006-2179-9
Abstract: Aluminum (AI) foil is widely used as a current collector in lithium ion batteries, EDLCs and other electrochemical devices, and its electrochemical behavior in electrolytes has great effect on the cycle performances and safety of the electrochemical devices. In this work, corrosion behavior of AI foil in 1-alkyl-3-methylimidazolium tetrafluoroborate ionic liquids and its electrolytes containing LiTFSI as salt were studied using cyclic voltammogram method. It was found that a passive film was firmly formed on the surface of AI foil after the anodic polarization in BMI-BF4 compared to those in EMI-BF4 and PMI-BF4. In addition, anodic polarization research showed that the passive film on AI surface in BMI-TFSI did not well exist. A good passive film formed on the surface of AI foil in BMI-BF4 was not broken down until the potential was up to 94.58 V. Moreover, EDX and XPS analysis showed that F and O exist on the AI surface after the anodic polarization in BMI-BF4, which indicated that a passive film like AIF3 and Al2O3 may be formed on its surface.
The compositional inverses of linearized permutation binomials over finite fields
Baofeng Wu
Mathematics , 2013,
Abstract: Let $q$ be a prime power and $n$ and $r$ be positive integers. It is well known that the linearized binomial $L_r(x)=x^{q^r}+ax\in\mathbb{F}_{q^n}[x]$ is a permutation polynomial if and only if $(-1)^{n/d}a^{{(q^n-1)}/{(q^{d}-1)}}\neq 1$ where $d=(n,r)$. In this paper, the compositional inverse of $L_r(x)$ is explicitly determined when this condition holds.
The compositional inverse of a class of linearized permutation polynomials over $\mathbb{F}_{2^n}$, $n$ odd
Baofeng Wu
Mathematics , 2013,
Abstract: In this paper, the compositional inverses of a class of linearized permutation polynomials of the form $P(x)=x+x^2+\tr(\frac{x}{a})$ over the finite field $\mathbb{F}_{2^n}$ for an odd positive integer $n$ are explicitly determined.
$\mathcal{P}\mathcal{S}$ bent functions constructed from finite pre-quasifield spreads
Baofeng Wu
Mathematics , 2013,
Abstract: Bent functions are of great importance in both mathematics and information science. The $\mathcal{P}\mathcal{S}$ class of bent functions was introduced by Dillon in 1974, but functions belonging to this class that can be explicitly represented are only the $\mathcal{P}\mathcal{S}_{\text{ap}}$ functions, which were also constructed by Dillon after his introduction of the $\mathcal{P}\mathcal{S}$ class. In this paper, a technique of using finite pre-quasifield spread from finite geometry to construct $\mathcal{P}\mathcal{S}$ bent functions is proposed. The constructed functions are in similar styles with the $\mathcal{P}\mathcal{S}_{\text{ap}}$ functions. To explicitly represent them in bivariate forms, the main task is to compute compositional inverses of certain parametric permutation polynomials over finite fields of characteristic 2. Concentrated on the Dempwolff-M\"uller pre-quasifield, the Knuth pre-semifield and the Kantor pre-semifield, three new subclasses of the $\mathcal{P}\mathcal{S}$ class are obtained. They are the only sub-classes that can be explicitly constructed more than 30 years after the $\mathcal{P}\mathcal{S}_{\text{ap}}$ subclass was introduced.
Characterization, phylogeny, alternative splicing and expression of Sox30 gene
Fei Han, Zhijian Wang, Fengrui Wu, Zhihao Liu, Baofeng Huang, Deshou Wang
BMC Molecular Biology , 2010, DOI: 10.1186/1471-2199-11-98
Abstract: Sox30 cDNA was cloned from the Nile tilapia by RT-PCR and RACE. Screening of available genome and EST databases and phylogenetic analysis showed that Sox30 also exists in non-mammalian vertebrates and invertebrates, which was further supported by synteny analyses. Tissue expression in human, mouse and tilapia suggested that Sox30 was probably a gonad-specific gene, which was also supported by the fact that Sox30 EST sequences were obtained from gonads of the animal species. In addition, four alternatively spliced isoforms were isolated from tilapia gonad. Their temporal and spatial expression patterns during normal and sex reversed gonadal development were investigated by RT-PCR and in situ hybridization. Our data suggest that expressions of Sox30 isoforms are related to stage and phenotypic-sex, observed in the germ cells of male gonad and in somatic cells of the female gonad.Sox30 is not a gene only existed in mammals, but exists widely throughout the animal kingdom as supported by our bioinformatic, phylogenetic and syntenic analyses. It is very likely that Sox30 is expressed exclusively in gonads. Expression analyses revealed that Sox30 may be involved in female and male gonadal development at different stages by alternative splicing.Since the discovery of Sry [1-3], numerous genes encoding proteins containing HMG (High Mobility Group) domain have been identified throughout the animal kingdom [4-6]. Genes with their HMG domains similar to that of Sry (testis determining gene in mammals) by at least 50% were named as Sox (SRY-related HMG-box) genes [5]. At present, Sox genes encoding transcription factors, count about 30 members in vertebrates [6,7]. Based on differing levels of structural, organizational similarities and other features, Sox genes can be subdivided into 10 groups, named from A to J [8]. Members of the same group are similar to each other within and outside the HMG-box. However, members from different groups share lower degree of identity in the H
Involvement of Glutamate Transporter-1 in Neuroprotection against Global Brain Ischemia-Reperfusion Injury Induced by Postconditioning in Rats
Weiqiao Zhang,Yifeng Miao,Sanquan Zhou,Baofeng Wang,Qizhong Luo,Yongming Qiu
International Journal of Molecular Sciences , 2010, DOI: 10.3390/ijms11114407
Abstract: Ischemic postconditioning refers to several transient reperfusion and ischemia cycles after an ischemic event and before a long duration of reperfusion. The procedure produces neuroprotective effects. The mechanisms underlying these neuroprotective effects are poorly understood. In this study, we found that most neurons in the CA1 region died after 10 minutes of ischemia and is followed by 72 hours of reperfusion. However, brain ischemic postconditioning (six cycles of 10 s/10 s reperfusion/re-occlusion) signi?cantly reduced neuronal death. Signi?cant up-regulation of Glutamate transporter-1 was found after 3, 6, 24, 72 hours of reperfusion. The present study showed that ischemic postconditioning decreases cell death and that upregulation of GLT-1 expression may play an important role on this effect.
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