Performance analysis of a rate adaptive multi-band ultra-wideband system based on quadrature fractal modulation scheme

“…A rate adaptive multi-band ultra-wideband （UWB） system based on the quadrature fractal modulation （QFM） scheme was proposed.Exploring the use of homogeneous signals as modulating waveforms in UWB system,the signal within each 528MHz sub-band was divided into 8 different frequency bandwidths using wavelets transform and these data sequences to be transmitted were embedded into homogeneous waveforms.It is found that the use of homogeneous signals in such UWB system is quite feasible,leadings to a novel multi-rate diversity strategy.Within each 528MHz sub-band,the UWB-QFM system can provide much higher data rates than that of the UWB orthogonal frequency division multiplexing （OFDM） system.Simulation results also show that the bit error rate （BER） performance of the UWB-QFM system achieves a greatly improvement over existing UWB-OFDM system.Due to the fractal properties of the homogeneous signals,these data sequences to be transmitted can be recovered using arbitrarily short receiver signal.…”
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The effect of using Naive Bayes to detect spam email by Sun Zehui

“…Therefore, spam detection and filtering have become especially urgent and of great practical importance. This paper focuses on the spam detection method based on the plain Bayesian algorithm. …”
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Polityka socjalna i sytuacja ludzi w podeszłym wieku by Piotr Krajewski

“…We have observed great interest in the phenomenon of aging of the population and its consequences. …”
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İnönü Muharebelerinin İç Kamuoyuna Yansımaları by İbrahim TAVUKÇU

“…The successes achieved in these battles had great repercussions in the internal public opinion. …”
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AN ALTERNATIVE APPROACH TO DETERMINING THE RATE OF RUNOFF OF UNSTUDIED RIVERS (THE AMUR RIVER BASIN IN THE TRANSBAIKAL KRAI AS A STUDY CASE) by Dmitry A. Shalikovskiy, Valeriy N. Zaslonovskiy, Andrey V. Shalikovskiy

“…This is because of the fact that approximation function of the entire data file actually reflects regularities only for hydrological stations with great values of the runoff norm. For the territory of the Amur Basin within the Transbaikal cray, five regions have been identified, within which the dependences of the flow rate of small and medium rivers have values of the correlation coefficient from 0.95 to 0.97. …”

INFLUENCE STUDY ON THE LOGO OF AN ENGINE CONNECTING ROD TO ITS FATIGUE STRENGTH by JIA DeWen, SONG Dong, LEI JiLin, DENG Wei, CUI ZhiZhong, ZHANG TaoTao

“…The depressing logo could greatly reduce the stress comparing with the protruding logo. …”
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RETRACTED: Decision making in agricultural organizations: integral assessment methodology by Babkin Alexandr, Burkaltseva Diana, Kirilchuk Svetlana, Apatova Natalia, Vorobyova Elena, Borsch Lyudmila, Nalivaychenko Ekaterina, Blazhevich Oleg, Guk Olga, Bondarenko Daniil, Osmanova Elnara, Polskaya Svetlana, Kalieva Nazira

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Źródła antropologii Juliana Haynesa Stewarda by Ryszard F. Sadowski

“…It emphasizes the role of Steward’s parents, his college educators, and professors in Berkeley, as well as his personal experience during the Great Depression. Finally, this article describes the influence of the intellectual community on Steward, especially by F. …”
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Relationship between External Environment, Internal Conditions, and Digital Transformation from the Perspective of Synergetics by Xiaowen Luo, Shun-Chi Yu

“…Customer needs and digital strategies have great impacts on pharmaceutical enterprises’ DT. …”
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O impacto da realização da Copa das Confederações da FIFA de 2013 e da Copa do Mundo da FIFA de 2014 na criminalidade em Belo Horizonte by Alexandre Magno Alves Diniz, Ludmila Lopes Ribeiro, Ricardo Henrique Palhares

“…Belo Horizonte, one of Brazil's main urban centers, experienced great social unrest during the FIFA Confederations Cup 2013 and the FIFA World Cup 2014, which raised concerns about the criminal incidence. …”
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Scope and trends of the digital transformation in the world industry by E. N. Smirnov, M. Yu. Antropova

“…As practice shows, mining and metallurgical companies lag behind other industries in the field of digital transformation, although they have great potential. This lag behind mainly due to the risks associated with the transformation and development of new digital production technologies, while it is possible to adhere to traditional and proven methods of work.…”
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Terahertz wave propagation and channel characterization by Haofan YI, Ke GUAN, Danping HE, Bo AI, Zhengrong LAI, Zhangdui ZHONG

“…Firstly, the different characteristics of terahertz waves compared to lower frequency bands were summarized, including the influence of meteorological factors and rough surfaces of materials on THz waves.Next, it was proposed to use ray-tracing (RT) technology to calibrate the three-dimensional (3D) environment model and electromagnetic parameters of materials in the target scenarios through very limited channel measurement data.Then, the reversed parameters were utilized to perform in a similar but more general scenario, instead of a large amount of channel measurement data.Finally, the channel characteristics were analyzed by extraction of the channel key parameters, such as path loss, shadow fading, Rician K-factor, delay spread, angular spread, and doppler parameters in a mobile scenario.Representing two ends of 6G THz use cases from indoor scenario to outdoor scenario, case studies were made for wireless connections on a desktop and vehicular communications, respectively.As for the outdoor scenario, the influences of meteorological factors were additionally considered.The work is of great significance for the design and evaluation of the THz communication system.…”
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De l’argument à l’action : la biodiversité au service des jardins familiaux by Jean-Noël Consalès, Sophie Joimel, France Cordier, Cloé Jareno, Élodie-Denise Chenot, Christophe Schwartz

“…Allotment gardens also give rise to renewed considerations and practises, but ones which are greatly marked by representations and ambiguities regarding the notion of biodiversity. …”
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Influence of the Technological Parameter and Die Structure on Metal Flow Line for Precision Forging Car Gear Blank by Li Tianxing, Zhang Xunlei, Fu Jianzhong, Gao Zhenshan, Wu Shuaibin, Yang Chao

“…The technological parameter and die structure have greatly effect on the direction of metal flow. The influence law of structure of the die and punch on metal flow line distribution state of car gear blanks is deeply analyzed by means of finite element simulation software DEFORM- 3D. …”
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Tatars in the Grand Duchy of Lithuania in the 14th–16th Centuries by Yaroslav Pylypchuk

“…Representatives of this family went on diplomatic missions to the Big Horde. The rulers of the Great Horde and the Crimean Khanate did not con- sider it shameful to write to the apostate and the provincial prince. …”
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Możliwości współczesnej recepcji utworów Stanisława Jachowicza, dydaktycznej literatury dziewiętnastowiecznej by Beata Telatyńska

“…Only romanticism saw the great potential that the engagement with the topic of childhood offered. …”
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Scots Pine Bark Extracts as Co-Hardeners of Epoxy Resins by Tomasz Szmechtyk

“…Extracts from natural waste like bark or leaves are great sources of phytochemicals, which contain functional groups (hydroxyl, carboxylic, vinyl, allyl) attractive in terms of polymer synthesis. …”
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Tissue Engineering of the Urinary Bladder: Current Concepts and Future Perspectives by Vladimir Petrovic, Jablan Stankovic, Vladisav Stefanovic

“…Some of the disorders, such as bladder acontractility, bladder cancer, and inflammatory disease, represent a great challenge in practice due to the number of complications that can occur after the intervention and due to frequent relapses. …”
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Computer Simulations of Contact Forces for Airbags with Different Folding Patterns During Deployment Phase by King H. Yang, Yun-Qiang Li, Danyu Sun

“…Although the kinematics of the model appear reasonable, the numbers generated by the model must be reviewed with great caution because the model has not been fully validated.…”
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Accompagner à la littéracie universitaire par le dialogue by Claire Polo

“…In this context, we intend to support their academic literacy through pedagogical tools fostering students’ autonomy, with a special focus on making sense of the use or production of written materials. Dialogue plays a great role in this meaning making process, since learning and reasoning may only occur in interaction with peers, with the didactical objects studied, with existing literature, and with the audience to whom the project is directed.…”
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