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Zaiqun W.,Baise University
Proceedings - 9th International Conference on Measuring Technology and Mechatronics Automation, ICMTMA 2017 | Year: 2017

In the scientific research and engineering practice, the detection of weak signal is often encountered. The traditional signal detection method can not accurately and effectively analyze the weak current. To this end, a phase-locked amplification was proposed to detect weak signal. According to the relevant theory of phase-locked amplifier, using the characteristic that the correlation between the reference signal and the signal to be measured was strong, the interdependency of the noise signal was weak, we detected the signal from a large amount of background noise for obtaining the amplitude and phase information of the signal to be measured under strong noise background. The weak signal was amplified and filtered. After amplifying, the signal went into the anti aliasing filter for filtering, which filtered out the interference of high frequency noise, and modulated the signal after the conversion. The experimental results show that the mathematical demodulation system based on FPGA, which has stable working performance and high detection precision to detect weak photoelectric signal. When the signal-to-noise ratio of RSNR is -26dB, the minimum detection accuracy can reach to 0.02pA, which has wide application value. © 2017 IEEE.

Liu Z.,Guangxi University for Nationalities | Li X.,Baise University
Nonlinear Analysis: Real World Applications | Year: 2015

In this paper, we deal with the approximate controllability for control systems described by a class of hemivariational inequalities. Firstly, we introduce the concept of mild solutions for hemivariational inequalities. Then the approximate controllability is formulated and proved by utilizing a fixed-point theorem of multivalued maps and properties of generalized Clarke subdifferential. © 2014 Elsevier Ltd. All rights reserved.

Chen Z.-F.,Baise University | Chen Z.-F.,Guangzhou University
Research in Astronomy and Astrophysics | Year: 2013

We make use of the recent large sample of 17 042 Mg II absorption systems from Quider et al. to analyze the evolution of the redshift number density. Regardless of the strength of the absorption line, we find that the evolution of the redshift number density can be clearly distinguished into three different phases. In the intermediate redshift epoch (0.6 ≲ z ≲ 1.6), the evolution of the redshift number density is consistent with the non-evolution curve, however, the non-evolution curve over-predicts the values of the redshift number density in the early (z ≲ 0.6) and late (z 1.6) epochs. Based on the invariant cross-section of the absorber, the lack of evolution in the redshift number density compared to the non-evolution curve implies the galaxy number density does not evolve during the middle epoch. The flat evolution of the redshift number density tends to correspond to a shallow evolution in the galaxy merger rate during the late epoch, and the steep decrease of the redshift number density might be ascribed to the small mass of halos during the early epoch. © 2013 National Astronomical Observatories of Chinese Academy of Sciences and IOP Publishing Ltd.

Huang X.,Baise University
Journal of Networks | Year: 2014

The node localization technology of wireless sensor networks is essential and prerequisite to many applications, which it is one of the important support technologies for wireless sensor networks. The node localization is to get the position information of blind node by using location information of few known nodes and some special mechanisms. This paper primarily investigates a kind of target localization technology based on the improved DV-Hop algorithm in wireless sensor networks. We firstly compute the distances measured by RSSI and the mean value of one-hop distance. Then we can use the differences between the mean and the actual distance to get the error correction between the total distance and average one-hop distance. Replace trilateration with hybrid localization of MIN-MAX and weighted least square method. Finally, simulation experiment results show the improved algorithm can effectively carry out the network localization, thus has a certain of practical value. © 2014 ACADEMY PUBLISHER.

Liu C.Q.,Baise University
Applied Mechanics and Materials | Year: 2014

By using the empirical likelihood method, a testing method is proposed for longitudinal varying coefficient models. Some simulations and a real data analysis are undertaken to investigate the power of the empirical likelihood based testing method. © (2014) Trans Tech Publications, Switzerland.

Luo C.,Baise University
WIT Transactions on Information and Communication Technologies | Year: 2014

In real life, there exist many different kinds of transportation methods. The different method possesses its own vehicle operation cost, driving speed, and road toll rate. Therefore, the congestion toll shall be different in accordance with transportation method. This paper gives the trip time cost, operation toll cost, and the road toll cost of the general cost, based on which, combine the individual trip decision, gives the general cost of wo level programming mode based on the trip decision, and also combine the penalty function and step acceleration method to solve. © 2014 WIT Press.

Zhao J.-H.,Baise University
Acta Crystallographica Section E: Structure Reports Online | Year: 2012

In the title compound, {[La(C6H4NO2) 2(H2O)4]Cl}n, the LaIII atom lies on a twofold rotation axis and is eight-coordinated by four O atoms from four isonicotinate ligands and four water molecules in a distorted square-antiprismatic coodination environment. Adjacent LaIII atoms are bridged by two carboxylate groups from two isonicotinate ligands, forming an extended chain along [001]. These chains are linked through O - H⋯N hydrogen bonds into a three-dimensional network with channels in which the chloride anions form O - H⋯Cl hydrogen bonds. Intrachain O - H⋯O hydrogen bonds and π-π interactions [centroid-centroid distance = 3.908 (2) Å] are also observed. © 2012 International Union of Crystallography.

Qin H.C.,Baise University
Advanced Materials Research | Year: 2014

With the rapid development of information technology, improvements on financial management system in colleges and universities are required. Based on analyzing the characteristics of the financial management system in Guangxi colleges and universities, the work optimized the procedure of financial management. With financial processing module as the core, 8 subsystem modules are designed including student finance subsystem, wages management subsystem, to achieve intelligent financial management. © (2014) Trans Tech Publications, Switzerland.

Wang S.,Chinese Academy of Sciences | Jiao S.,Baise University | Xin H.,Chinese Academy of Sciences
Quaternary International | Year: 2013

Annual and seasonal changes of temperature and precipitation were analyzed based on climate data at 37 meteorological stations in Sichuan Province (SP, Southwest China) by using trends detection and kriging spatial interpolation approaches during the period 1960-2009. The results showed that mean annual temperature (MAT) over the SP increased at a rate of 0.173 °C/decade in the most recent five decades, while a significant warming trend of 0.26 °C/decade was observed for winter. It is demonstrated statistically that MAT across the SP has a large spatial heterogeneity. A relatively great rising with a rate of 0.198 and 0.202 °C/decade occurred in Northwest Sichuan (NWS) and Southwest Sichuan (SWS), while a smaller increase at a rate of 0.12 °C/decade took place in the Sichuan Basin (SB) in the past 50 years. This means that mountainous regions are more sensitive and vulnerable to climate change than lowlands. In contrast to the temperature, the significance of changes in precipitation during 1960-2009 was low. Annual precipitation showed nonsignificant decreasing trends of -4.19 mm/decade, in which the decrease rate of -7.44 mm/decade in autumn is the most significant. In NWS and SWS, the precipitation exhibited insignificantly increasing trend of 1.41 and 9.69 mm/decade, respectively, whereas it decreased significantly at a rate of -23.70 mm/decade in SB from 1960 to 2009. In the spatial distribution, the magnitude of precipitation change exhibited a decreasing trend from the surrounding mountains to the central basin in the last five decades, which can be influenced strongly by the thermal difference between the Tibetan Plateau and the plain east of Plateau. © 2012 Elsevier Ltd and INQUA.

Huang X.,Baise University
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2010

The multimedia information, especially video and audio information, regarded as a common data stream, with the traditional encryption technology encrypted, ignoring the characteristics of multimedia data, has some limitations. On the other hand, chaotic sequences have several good properties including the ease of their generation, their sensitive dependence on their initial condition and so on. Therefore, this paper discussed image encryption arithmetic on the basis of chaotic sequences through dispersing the real number value chaotic sequences into symbol matrix and transformation matrix, and then encrypted the image. Preliminary results proved that the image encryption arithmetic based on chaotic sequences possesses the traits, namely fast speed for encryption speed, perfect results for encryption. © 2010 Copyright SPIE - The International Society for Optical Engineering.

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