141,067 research outputs found
Corrigendum to “General reduced vehicle model for simulating truck-bridge pier collisions” [Dev. Built. Environ. 16 (2023) 100233] (Developments in the Built Environment (2023) 16, (S2666165923001151), (10.1016/j.dibe.2023.100233))
No full textThe authors regret there were two errors in the authors' affiliation in the published article. First, the affiliation of the first author (Daogang Ou) should only be the School of Civil Engineering, Hunan University of Science and Technology, Xiangtan, 411201, China. Second, the corresponding author (Lin Chen) should have two affiliations; the first one should be: School of Civil Engineering, Hunan University of Science and Technology, Xiangtan, 411201, China; and the second one should be: Key Laboratory of Building Safety and Energy Efficiency of Ministry of Education, Hunan University, Changsha, 410082, China. The authors would like to apologise for any inconvenience caused
Measurement of surface potential decay of corona-charged polymer films using the pulsed electroacoustic method
No full textIn this paper, the pulsed electroacoustic (PEA) technique that allows the determination of space charge in a dielectric material has been used to monitor the electrical potential decay of corona-charged polyethylene films of different thicknesses. To prevent possible disturbance on the surface charge during the PEA measurements, two thin polyethylene films were placed on both sides of the corona-charged sample. Charge profiles measured at different times were used to calculate the potential across the sample. The obtained potential decay was compared with the potential measured using the conventional method. A good agreement has been obtained. More importantly, the charge profile obtained using the PEA technique indicates that bipolar charge injection has taken place
Adaptive Minimum-BER Linear Multiuser Detection for DS-CDMA Signals in Multipath Channels
No full textThe problem of constructing adaptive minimum bit error rate (MBER) linear multiuser detectors is considered for direct-sequence code division multiple access (DS-CDMA) signals transmitted through multipath channels. Based on the approach of kernel density estimation for approximating the bit error rate (BER) from training data, a least mean squares (LMS) style stochastic gradient adaptive algorithm is developed for training linear multiuser detectors. Computer simulation is used to study the convergence speed and steady-state BER misadjustment of this adaptive MBER linear multiuser detector, and the results show that it outperforms an existing LMS-style adaptive MBER algorithm first presented at Globecom'98 by Yeh, Lopes and Barry
Wpływ traktowania nasion sałaty (Lactuca sativa L.) roztworami olejków eterycznych z drzewa kamforowego (Cinnamomum camphora L.) i paczuli (Pogostemon cablin Benth.) na ich kiełkowanie
No full textOne of the most important problems in horticultural seed science and technology nowadays is looking for new methods to improve seed quality. Especially interesting are the ones, in which compounds of natural origin are used. One of such groups is ethereal oils from plants. The commercial seed samples of lettuce (Lactuca sativa L. ‘Dumka’) were soaked in 9 different treatments of 5% alcoholic solution of camphor tree (Cinnamomum camphora L.) ethereal oil and 9 different treatments of 5% alcoholic solution of patchouli plant (Pogostemon cablin Benth.) ethereal oil. Then the seeds were routinely tested for seed germination, the length of the received seedlings was also measured and the seeds health status was evaluated. The tested ethereal oils had no effect on the germination of lettuce seeds. However, soaking the seeds in the ethereal oils solutions did decrease the percentage of dead seeds in the tested samples. Soaking of the seeds in the ethereal oils solutions also increased the percentage of healthy ungerminated seeds. Treating the seeds with the concentrations of the ethereal oils solutions, although had no effect on their germination, still shortened the length of seedlings. Moreover, the used ethereal oils lowered the amount of identified Alternaria alternata and Cladosporium sphaerospermum fungi on the seeds.Jednym z najważniejszych problemów nasiennictwa ogrodniczego dziś jest poszukiwanie nowych metod poprawy jakości nasion. Szczególnie interesujące są te z nich, w których wykorzystuje się substancje naturalne. Jedną z takich grup są olejki eteryczne z roślin. Nasiona handlowe sałaty (Lactuca sativa L.) odmiany Dumka potraktowano na 9 różnych sposobów 5% alkoholowym roztworem olejku eterycznego z drzewa kamforowego (Cinnamomum camphora L.) i na 9 różnych sposobów 5% alkoholowym roztworem olejku eterycznego z paczuli (Pogostemon cablin Benth.). Następnie nasiona poddano rutynowej ocenie kiełkowania, zmierzono długość otrzymanych siewek i oceniono zdrowotność nasion. Badane olejki eteryczne nie wpłynęły na kiełkowanie nasion sałaty, natomiast zmniejszyły odsetek martwych nasion w badanych próbach. Moczenie nasion w badanych roztworach olejków zwiększyło także odsetek nasion zdrowych niekiełkujących. Traktowanie nasion roztworami olejków eterycznych o wyższych stężeniach, choć nie wpłynęło na ich kiełkowanie, to jednak skróciło długość otrzymanych z nich siewek. Ponadto stosowane olejki eteryczne obniżyły ilość oznaczonych na nasionach grzybów: Alternaria alternata i Cladosporium sphaerospermum
Adaptive Minimum Bit Error Rate Beamforming
No full textAn adaptive beamforming technique is proposed based on directly minimizing the bit error rate. It is demonstrated that this minimum bit error rate (MBER) approach utilizes the antenna array elements more intelligently, than the standard minimum mean square error (MMSE) approach. Consequently, MBER beamforming is capable of providing significant performance gains in terms of a reduced bit error rate over MMSE beamforming. A block-data adaptive implementation of the MBER beamforming solution is developed based on the Parzen window estimate of probability density function. Furthermore, a sample-by-sample adaptive implementation is considered, and a stochastic gradient algorithm, referred to as the least bit error rate, is derived. The proposed adaptive MBER beamforming technique provides an extension to the existing work (Mulgrew and Chen 2001, Chen et al 2001} for adaptive MBER equalization and multiuser detection
Orthogonal least squares methods and their application to non-linear system identification
No full textIdentification algorithms based on the well-known linear least squares methods ofgaussian elimination, Cholesky decomposition, classical Gram-Schmidt, modifiedGram-Schmidt, Householder transformation, Givens method, and singular valuedecomposition are reviewed. The classical Gram-Schmidt, modified Gram-Schmidt,and Householder transformation algorithms are then extended to combinestructure determination, or which terms to include in the model, and parameterestimation in a very simple and efficient manner for a class of multivariablediscrete-time non-linear stochastic systems which are linear in the parameters
Enhanced degradation of fomesafen by a rhizobial strain Sinorhizobium sp. W16 in symbiotic association with soybean: Datasets and Supplementary Materials
No full textAssociated publication: Chen, W., Gao, Y., Shi, G., Li, J., Fan, G., Yang, C., Wang, B., Tong, F., Li, Y. (2022) "Enhanced degradation of fomesafen by a rhizobial strain Sinorhizobium sp. W16 in symbiotic association with soybean."Fomesafen, a broad-spectrum herbicide with a long duration, is frequently applied in legume farmlands, causing severe damage to crop growth and the local environment. Rhizobia can develop key enzyme systems to degrade organic pollutants and form a symbiotic relationship with legumes to enhance the degradation of fomesafen. However, there are few relevant studies examining this phenomenon. In this study, a fomesafen-degrading rhizobium, Sinorhizobium sp. W16, was isolated from a soybean nodule for the first time. The metabolic study of fomesafen in its pure culture revealed a novel biodegradation pathway, which was initiated by cleavage of the S‒N bond, followed by dechlorination and cleavage of the ether bond. Strain W16 efficiently degraded fomesafen by 69% and 38% under fomesafen concentrations of 5 mg L-1 and 50 mg L-1 over 7 days, respectively. The pot experiment results demonstrated that strain W16 colonizes the soybean rhizosphere successfully and eliminates the inhibition of fomesafen on nitrogen fixation by stimulating the indigenous nitrogen-fixing microbes in the rhizosphere. These developed symbiotic relationships promote fomesafen degradation rates by 29.17%-57.87%. This study provides valuable information about a novel fomesafen-degrading rhizobium with great potential for promoting the bioremediation of herbicide-contaminated farmland soil due to the development of symbiotic systems with legumes.Contact information: Wei Chen, Jiangsu Academy of Agricultural Sciences, Nanjing, China, [email protected] of data collection: 2019/06 - 2021/0
Mobile Payment in China: A Study from a Sociological Perspective
No full textThis study aims to analyse and clarify why mobile payments have been adopted in China at such a rapid pace. Unlike previous studies which focused on mobile payment functionality and the micro-level reasons for adoption, this study emphasized the macro-level and meso-level reasons with an emphasis on social relationships or guanxi to explain the widespread and rapid adoption in China of mobile payment. Initially mobile payment was widely dispersed by leveraging the trust existing in strong relationship ties (e.g. mobile ‘red packets’). In the second phase of mass adoption there was a shift toward relying on economic exchanges in the context of weak urban ties. Now in the third phase mobile payment seeks to abandon social relations altogether relying on technologies for direct human-to-machine interactions. The three successive phases show how the strong interactions between financial regulatory policy and mobile payment development have affected social relationships
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