Wyniki wyszukiwania - Biblioteka Nauki

1

Adaptive control of autonomous underwater vehicle based on fuzzy neural network

100%

Qin Z. , Gu J.

Journal of Automation Mobile Robotics and Intelligent Systems

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2010

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tom Vol. 4, No. 1

104-111

EN

This paper presents an adaptive control method based on fuzzy neural network for Autonomous Underwater Vehicle (AUV). The Fuzzy Neural Network (FNN) could build the inverse model of AUV through on-line learning algorithm, which is free of fuzzy neural network structure knowledge and prior fuzzy inference rules. The adaptive controller for AUV based on FNN is proposed, and then the stability of the resulting AUV closed-loop control system is analyzed by Lyaponov stability theory. The validity of the proposed control method has been verified through computer simulation experiments.

2

An Improved Certificateless Signature Scheme Secure in the Standard Model

80%

Xiong H. , Qin Z. , Li F.

Fundamenta Informaticae

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2008

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tom Vol. 88, nr 1-2

193-206

EN

In ASIACCS 2007, Liu et al proposed a certificateless signature scheme which is provably secure in the standard model. However, as we will show in this paper, the proposed scheme is insecure against a malicious-but-passive KGC attack. This implies that the malicious-but-passive KGC, which generates system parameters based on the information of the target user, can forge valid signatures for that signer without being detected. Furthermore, we propose an improved scheme that remedies the weakness of Liu et al’s scheme. The improved scheme can be proven secure against malicious-but-passive KGC attack in the standard model.

3

Research on the Mechanism of Pin-to-Pin ESD to SCB Initiators

80%

Chen F. , Zhou B. , Qin Z.

Przegląd Elektrotechniczny

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2011

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tom R. 87, nr 12a

169-172

EN

By ESD experiment, SEM-EDXA and firing experiment, the electrostatic-response characteristic of SCB was studied and the electrical explosion performance after ESD was measured. Results show that surface-damage of bridge is not obviously visible when lower than 25kV, but part of samples coated with explosive fire; the V-type angles start to be damaged at 25kV. After ESD, the function time and firing energy required decrease significantly. 25kV is the critical damage-voltage of the bridge. When less than 25kV, the electrical energy can only make the polysilicon melting and at 25kV, the temperature reaches the boiling point of silicon to generate plasma.

PL

Analizowano odpowiedź elektrostatyczną i parametry inicjatora eksplozji. Uszkodzenia mostka są nie zawsze widoczne jeśli napięcie jest poniżej 25 kV. Dlatego stwierdzono że napięcie 25 kV jest krytyczne, poniżej powoduje topienie polisilikonu, ale powyżej skutkuje tworzeniem się plazmy.

4

Pollution processes in chinese mining area from isotope evidence

80%

Meng Z. , Yang Y. , Qin Z.

Polish Journal of Environmental Studies

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2018

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tom 27

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nr 6

EN

Hydrological and nitrate pollution processes are important parts of aquatic ecosystems. For this study we collected samples of river water, reservoir water, shallow groundwater, deep groundwater, and precipitation in the Fenhe River Basin. δD and δ¹⁸O were used to identify the hydrological process. δ¹⁵N-NO₃⁻ and δ¹⁸O-NO₃⁻ were used to identify the sources and pollution process of NO₃⁻. The results show that precipitation is the main source of water in the study area, and there is an obvious isotopic fractionation caused by evaporation. The reservoir water, river water, soil water, and shallow groundwater had a mutual recharge and discharge association. Deep groundwater is recharged by archaic groundwater and less affected by evaporation and human activity. NO₃⁻ is the main N species in the study area, nitrification is the main source of NO₃⁻, and denitrification is also found in some river branches. 46.2% of NO₃⁻-N concentrations exceeded the drinking water standard of China. NO₃⁻ Sources are mainly controlled by land use type. Nitrogen in precipitation and soil organic N are the major sources of NO₃⁻ in the upstream. The midstream area is mainly polluted by manure and sewage, while the downstream area is polluted by a mixture of soil organic N and fertilizers.

5

Research on Damage Mechanism of SCB Initiators under RF

80%

Chen F. , Zhou B. , Qin Z. , Shen R.

Przegląd Elektrotechniczny

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2012

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tom R. 88, nr 11a

188-190

EN

In order to elucidate the response characteristic of semiconductor bridge(SCB) initiators under radio frequency(RF), RF measurement system was used to test the RF sensitivity of SCBs, after that the energy stored in a 22?F was used to activate the SCB. It is inferred from the results of Bruceton-method firing experiment that RF energy does not damage the SCB chip, but can lead to the accidental ignition of SCB initiators or change the color of normal lead styphnate(NLS). RF can also passivate SCB significantly and the all-fire voltage increases from 6.71V to 7.72V. The experimental data of X-ray photoelectron spectroscopy(XPS) analysis, directly indicated that heat generated by RF changes the valence of Pb in NLS from +2 to +4. The decomposition of NLS is responsible for the loss in sensitivity of SCBs. The research results provide a theoretical guidance for the electromagnetic compatibility(EMC) design of SCB initiators.

PL

W artykule opisano badanie oddziaływania sygnałów częstotliwości radiowej (ang. Radio Frequency) na zapalniki zbudowane z mostka półprzewodnikowego. Przedstawiono omówienie teoretyczne oraz wyniki badań eksperymentalnych.

6

Cryptanalysis of an Identity Based Signcryption without Random Oracles

80%

Xiong H. , Qin Z. , Li F.

Fundamenta Informaticae

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2011

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tom Vol. 107, nr 1

105-109

EN

Signcryption is a cryptographic primitive that performs digital signature and public key encryption simultaneously, at lower computational costs and communication overhead than signing and encrypting separately. Recently, Yu et al. proposed an identity based signcryption scheme with a claimed proof of security. We show that their scheme is not secure even against a chosen-plaintext attack.

7

Integrated core-log interpretation of Wenchuan earthquake Fault Scientific Drilling project borehole 4 (WFSD-4)

70%

Konaté A. A. , Pan H. , Ma H. , Qin Z. , Traoré A.

Acta Geophysica

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2017

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tom Vol. 65, no. 4

683--700

EN

Understanding slip behavior of active fault is a fundamental problem in earthquake investigations. Well logs and cores data provide direct information of physical properties of the fault zones at depth. The geological exploration of the Wenchuan earthquake Scientific Fault drilling project (WFSD) targeted the Yingxiu-Beichuan fault and the Guanxian Anxian fault, respectively. Five boreholes (WFSD-1, WFSD-2, WFSD-3P WFSD-3 and WFSD-4) were drilled and logged with geophysical tools developed for the use in petroleum industry. WFSD-1, WFSD-2 and WFSD-3 in situ logging data have been reported and investigated by geoscientists. Here we present for the first time, the integrated core-log studies in the Northern segment of Yingxiu-Beichuan fault (WFSD-4) thereby characterizing the physical properties of the lithologies(original rocks), fault rocks and the presumed slip zone associated with the Wenchuan earthquake. We also present results from the comparison of WFSD-4 to those obtained from WFSD-1, WFSD-3 and other drilling hole in active faults. This study show that integrated core-log study would help in understanding the slip behavior of active fault.

8

The effect of buffalo CD14 shRNA on the gene expression of TLR4 signal pathway in buffalo monocyte/macrophages

61%

Li X. , Li M. , Huang S. , Qiao S. , Qin Z. , Kang C. , Shi D.

Cellular and Molecular Biology Letters

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2014

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tom 19

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nr 4

EN

CD14 plays a crucial role in the inflammatory response to lipopolysaccharide (LPS), which interacts with TLR4 and MD-2 to enable cell activation, resulting in inflammation. Upstream inhibition of the inflammation pathway mediated by bacterial LPS, toll-like receptor 4 (TLR4) and cluster of differentiation antigen 14 (CD14) was proven to be an effective therapeutic approach for attenuating harmful immune activation. To explore the effect of CD14 downregulation on the expression of TLR4 signaling pathway-related genes after LPS stimulation in buffalo (Bubalus bubalis) monocyte/macrophages, effective CD14 shRNA sequences were screened using qRT-PCR and FACS analysis with buffalo CD14 shRNA lentiviral recombinant plasmids (pSicoRGFP-shRNA) and buffalo CD14 fusion expression plasmids (pDsRed-N1-buffalo CD14) co-transfected into HEK293T cells via liposomes. Of the tested shRNAs, shRNA-1041 revealed the highest knockdown efficiency (p < 0.01). When buffalo peripheral blood monocyte/macrophages were infected with shRNA-1041 lentivirus and stimulated with LPS, the expression of endogenous CD14 was significantly decreased by CD14 shRNA (p < 0.01), and the mRNA expression levels of TLR4, IL-6 and TNF-α were also significantly downregulated compared to the control groups (p < 0.01). These results demonstrated that the knockdown of endogenous CD14 had clear regulatory effects on the signal transduction of TLR4 after stimulation with LPS. These results may provide a better understanding of the molecular mechanisms of CD14 regulation in the development of several buffalo diseases.

9

Differential proteomic analysis of dwarf characteristics in cucumber (Cucumis sativus Linn.) stems

61%

Xin M. , Qin Z. , Wang L. , Zhu Y. , Wang C. , Zhu X.

Acta Physiologiae Plantarum

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2015

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tom 37

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nr 01

EN

Dwarfism was one of the most important agronomic traits in cucumber breeding. The current study was conducted to identify dwarf-related proteins using twodimensional electrophoresis. Twenty-two differentially expressed protein spots were detected between dwarf and vine genotypes while 20 of them were successfully identified by MALDI-TOF/TOF MS. Out of 20 identified proteins in dwarf genotype, 14 were up-regulated and six were down-regulated. The classification of differential proteins showed that the identified proteins were functionally involved in photosynthesis, energy metabolism, cytoskeletal functions, transduction and signal regulation, detoxification and redox regulation. Five differentially regulated proteins were analyzed using the technique quantitative real-time PCR (qRT-PCR). The results showed that four proteins, including histone deacetylase, the EIN2- like protein, chlorophyll A/B binding protein, and ubiquitin-conjugating enzyme Spm2 (E2) were up-regulated and one F-box family protein was down-regulated in the dwarf genotype. Further western blot analysis revealed that only E2 protein was detected in the dwarf genotype, indicating its important role in the cucumber dwarf trait.

10

Motion control and collision avoidance algorithms for unmanned surface vehicle swarm in practical maritime environment

61%

Zhuang J. , Zhang L. , Qin Z. , Sun H. , Wang B. , Cao J.

Polish Maritime Research

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2019

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tom 26

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nr 1

EN

The issue of controlling a swarm of autonomous unmanned surface vehicles (USVs) in a practical maritime environment is studied in this paper. A hierarchical control framework associated with control algorithms for the USV swarm is proposed. In order to implement the distributed control of the autonomous swarm, the control framework is divided into three task layers. The first layer is the tele-operated task layer, which delivers the human operator’s command to the remote USV swarm. The second layer deals with autonomous tasks (i.e. swarm dispersion, or avoidance of obstacles and/or inner-USV collisions), which are defined by specific mathematical functions. The third layer is the control allocation layer, in which the control inputs are designed by applying the sliding mode control method. The motion controller is proved asymptotically stable by using the Lyapunov method. Numerical simulation of USV swarm motion is used to verify the effectiveness of the control framework

11

Transcriptome profiling of cucumber genome expression in response to long-term low nitrogen stress

61%

Xin M. , Wang L. , Liu Y. , Feng Z. , Zhou X. , Qin Z.

Acta Physiologiae Plantarum

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2017

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tom 39

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nr 06

12

Transcriptome analysis reveals differentially expressed genes associated with propamocarb response in cucumber (Cucumis sativus L.) fruit

61%

Wu P. , Qin Z. , Zhao W. , Zhou X. , Wu T. , Xin M. , Guo Q.

Acta Physiologiae Plantarum

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2013

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tom 35

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nr 08

EN

High-throughput tag-sequencing (Tag-seq) from Illumina analysis, which is based on the Solexa Genome Analyzer platform, was applied to analyze the gene expression profiling of propamocarb (PM) treatment and control in cucumber fruit. Approximately 3.6 million complete clean sequence tags at PM treatment or control library were obtained with approximately 0.1 million distinct clean tag sequences. Approximately 41.79–43.15 % of the distinct clean tags were mapped unambiguously to the unigene database, and 32.54–33.46 % of the distinct clean tags were mapped to the cucumber genome database. The profiling analysis of the differentially expressed genes revealed the up-regulation of 546 genes and the downregulation of 185 genes with PM response. Furthermore, the differentially expressed genes mainly linked to pesticide detoxication, response to stress/stimulus, transporter/ signaling, and some important transcription factors. Finally, quantitative real-time polymerase chain reaction (qRT-PCR) and reverse transcription polymerase chain reaction (RT-PCR) using 16 genes independently verified the tag-mapped results. The present study reveals the comprehensive mechanisms of PM response in cucumber fruit.

13

Root yield, antioxidant capacities, and hormone contents in different drought-tolerant sweet potato cultivars treated with ABA under early drought stress

51%

Zhang H. , Duan W. , Xie B. , Wang B. , Hou F. , Li A. , Dong S. , Qin Z. , Wang Q. , Zhang L.

Acta Physiologiae Plantarum

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2020

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tom 42

|

nr 08

14

Chitooligosaccharide plays essential roles in regulating proline metabolism and cold stress tolerance in rice seedlings

51%

Zhang Y. , Fan L. , Zhao M. , Chen Q. , Qin Z. , Feng Z. , Fujiwara T. , Zhao L.

Acta Physiologiae Plantarum

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2019

|

tom 41

|

nr 06

EN

Rice is one of the most important crops around the world. The cold temperature as a major abiotic stress occurs frequently affecting rice growth and final plant yield. Chitooligosaccharide (COS) has been reported as an elicitor of plant immunity that can improve plant seedling tolerance to cold stress. However, the mechanisms on the enhanced cold tolerance is unclear. Here, we report that the rice seedlings treated by COS demonstrated good cold tolerance with promoted root vigor and plant growth. COS could increase contents of proline and glutamate in the seedlings. Moreover, expression analysis revealed COS significantly induced the transcripts of the key genes associated with the glutamate and proline biosynthesis pathway during cold stress. These results indicate that COS enhanced seedling growth and cold tolerance in rice may be caused by the osmotic regulation through the accumulations of glutamate and proline to provide significant osmo-protection.