Wyniki wyszukiwania - Biblioteka Nauki

1

On the space of (s)-integrable functions for a monotonic measure

100%

Wu C. , Ren X. , Wu C.

Commentationes Mathematicae

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2013

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tom Vol. 53, No. 2

135--145

EN

In this paper we introduce and study the space of real-valued (s)-integrable functions for a monotonic measure, and consider some relations between this space and the space of real-valued measurable functions.

2

On a property of phi-variational modular spaces

89%

Wang J. , Wu C.

Opuscula Mathematica

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2010

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tom Vol. 30, no. 2

209-215

EN

Maligranda pointed out whether condition (B.1) is satisfied in the variational modular space X*ρ is an open problem. We will answer this open problem in X*ρ', a subspace of X*ρ. As a consequence this modular space X*ρ' can be F-normed.

3

Higher Order Nonlinearity of Niho Functions

89%

Sun G. , Wu C.

Fundamenta Informaticae

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2015

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tom Vol. 137, nr 3

403--412

EN

The r-th order nonlinearity of Boolean functions is an important cryptographic criterion associated with some attacks on stream and block ciphers. It is also very useful in coding theory, since it is related to the covering radii of Reed-Muller codes. In this paper we investigate the lower bound of the higher-order nonlinearity of Niho Boolean functions f(x) = tr(λxd) over F2n, where... [formula]

4

First record of the genus Lepteucosma Diakonoff from China, with description of one new species [Lepidoptera: Tortricidae]

89%

Wu C. , Chen X.

Acta Zoologica Cracoviensia. Ser.B Invertebrata

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2006

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tom 49B

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nr 1-2

5

71%

Peng G. , Wu C. , Xu X. , Yang D.

Polish Journal of Ecology

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2012

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tom 60

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nr 2

EN

In woody perennials, leaf structure and biochemistry vary with tree age under changing environments. However, the related eco-physiological mechanisms have not been elucidated yet. In this study, we investigated agerelated responses of juvenile and mature subalpine fir trees (Abies faxoniana Rehder & E.H. Wilson.) growing at altitudes between 2,500 and 3,500 m in the Wanglang Natural Reserve in southwest China, to study the adaptive strategies of different age trees to suit changing environments. We found that there were distinct age- and altituderelated changes in the structural and biochemical characteristics of leaves. At all altitudes, mature trees exhibited higher area- and mass-based leaf nitrogen content (Narea, Nmass), leaf mass per area (LMA) and stable isotope carbon composition (δ13C), and a lower chlorophyll (Chl) content than those juvenile trees, except for Nmass at 3,000 m as well as LMA at 2,750 m, where the values of Nmass and LMA in mature trees were slightly lower than those in juvenile trees. Furthermore, leaf characteristics showed significant differences in the change rates with altitude between different age groups. Our results indicated that assimilative organs in mature trees do not suffering from nutrient deficiency and that juvenile and mature trees possess different adaptive growth strategies under changing environments, as indicated by higher leaf N content in mature trees and the opposite patterns of LMA and Chl content between two age groups. We also concluded that juvenile could be more sensitive to global warming due to a greater altitudinal influence on the leaf traits in juvenile trees than those in mature trees.

6

Transcript profiling during salt stress of young cotton (Gossypium hirsutum) seedlings via Solexa sequencing

71%

Wang G. , Zhu Q. , Meng Q. , Wu C.

Acta Physiologiae Plantarum

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2012

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tom 34

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nr 1

EN

Genome-wide gene expression profiling was conducted by Solexa sequencing in order to gain insight into the transcriptome dynamics that are associated with salt stress of cotton seedlings. A total of 145,794 and 138,518 clean tags were generated from the control and salinity libraries, respectively. Of these, 75,500 (51.8%) and 72,077 (52.0%) tags were matched to the reference genes. The most differentially regulated tags with a log2ratio >2 or >-2 (P <0.001) were analyzed further, representing 125 up- and 171 down-regulated genes except for unknown transcripts, which were classified into ten functional categories. The most enriched categories were those of metabolism, signaling pathway, environmental response and transcription. Many genes or biological pathways were found to be commonly shared between salt and other abiotic stresses in plants such as genes participating in environmental response, ABA signaling JA signaling, etc. Furthermore, the expression patterns of 12 genes were assessed by quantitative real-time PCR, and the results obtained showed general agreement with the Solexa data. Further analysis indicated the important roles of selected genes in salt tolerance by comparison with the mRNA levels in salt-tolerant cotton cultivar ZM3 with that in salt-sensitive cultivar LM6. Overall, we reveal the complex changes at the transcriptional level during salt stress of cotton seedlings and provide useful starting points for more in-depth analyses of cotton’s salt tolerance.

7

Entire graphs under a general flow

71%

Mao J. , Li G. , Wu C.

Demonstratio Mathematica

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2009

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tom Vol. 42, nr 3

631-640

EN

An initial entire graph with bounded second fundamental form in Rn+1 over some hyperplane is evolving under a general flow defined in the paper. For an additionally suitable condition in the main theorem, we obtain gradient and curvature estimates, leading to long-time existence of the flow, and convergence to an entire graph in the limit.

8

71%

Peng G. , Wu C. , Xu X. , Yang D.

Polish Journal of Ecology

|

2012

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tom Vol. 60, nr 2

311-321

EN

In woody perennials, leaf structure and biochemistry vary with tree age under changing environments. However, the related eco-physiological mechanisms have not been elucidated yet. In this study, we investigated agerelated responses of juvenile and mature subalpine fir trees (Abies faxoniana Rehder & E.H. Wilson.) growing at altitudes between 2,500 and 3,500 m in the Wanglang Natural Reserve in southwest China, to study the adaptive strategies of different age trees to suit changing environments. We found that there were distinct age- and altituderelated changes in the structural and biochemical characteristics of leaves. At all altitudes, mature trees exhibited higher area- and mass-based leaf nitrogen content (N[area], N[mass]), leaf mass per area (LMA) and stable isotope carbon composition ([delta^13]C), and a lower chlorophyll (Chl) content than those juvenile trees, except for N[mass] at 3,000 m as well as LMA at 2,750 m, where the values of N[mass] and LMA in mature trees were slightly lower than those in juvenile trees. Furthermore, leaf characteristics showed significant differences in the change rates with altitude between different age groups. Our results indicated that assimilative organs in mature trees do not suffering from nutrient deficiency and that juvenile and mature trees possess different adaptive growth strategies under changing environments, as indicated by higher leaf N content in mature trees and the opposite patterns of LMA and Chl content between two age groups. We also concluded that juvenile could be more sensitive to global warming due to a greater altitudinal influence on the leaf traits in juvenile trees than those in mature trees.

9

Phase Behavior and Solubilization of NAPL/Water/n-Dodecyl polyglucoside/n-Butanol Microemulsion System

71%

Chai J. , Yang X. , Gao Y. , Wu C.

Polish Journal of Chemistry

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2007

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tom Vol. 81, nr 4

547-556

EN

The phase behavior of the middle-phase microemulsion nonaqueous phase liquids (NAPLs)/water/n-dodecyl polyglucoside/n-butanol has been studied with Winsor type and - fishlike phase diagrams. The phase types, the phase volumes and the region of the middle-phase microemulsion were observed from Winsor phase diagram. From - fishlike phase diagram, the composition of the hydrophile-lipophile balanced interfacial layer was calculated. The solubilization power of the microemulsion for differentNAPLs was discussed, and the order of the solubilization power for three kinds of NAPLs is determined to be carbon tetrachloride > toluene > n-hexane.

10

Synthesis, Crystal Structure and Magnetism Study on a Two-Dimensional Cu(II) Coordination Polymer with 2,5-Dimethylpyrazine-1,4-dioxide as Bridging Ligand

71%

Shi J. , Zhang X. , Wu C. , Liu L.

Polish Journal of Chemistry

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2006

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tom Vol. 80, nr 12

2063-2068

11

A new genus in the subfamily Phycitinae [Lepidoptera: Pyralidae] from China

71%

Du Y. , Sung S. , Wu C.

Annales Zoologici

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2005

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tom 55

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nr 1

EN

A new genus, Furcata is erected and Furcata quadrangula is described as a new species Jour known species, Furcata dichromella (Ragonot), F. paradichromella (Yamanaka) F.pseudodichromella (Yamanaka) and F. karenkolla (Shibuya) are positioned in the new genus with F. dichromella (Ragonot) as the type species. The first three are transferred from Trachycera Ragonot, the last from Eurhodope Hübner. Both male and female genitalia of these five species, except the female of the new species, are illustrated. The type of the new species and other specimens examined are deposited in the Institute of Zoology, Chinese Academy of Sciences, Beijing (abbreviated as IZCAS in the following text).

12

Risk forecast of spontaneous combustion of sulfide ore dump in a stope and controlling approaches of the fire

62%

Wu C. , Li Z. , Yang F. , Hu H. , Gu D.

Archives of Mining Sciences

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2008

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tom Vol. 53, no 4

565-579

EN

In this paper, a set of reliable devices and flowchart used for testing the potential of spontaneous combustion of sulfide ores (SOSC) are presented. An effective assessment method which depends upon the fire index system for evaluating the risk of SOSC in amining stope is introduced. To get more detailed information on self-heating situation in the ore dump at various period, the surface temperature on the ore dump is measured by an infra image apparatus and the temperature in the ore dump is analyzed both by ANSYS and FLUENT software. These results are visual and effective for applying correct measures for preventing the fire-breeding. Also, a group of chemical agents for abating the oxidized velocity are invented and can be sprayed into the ore dump. By integrating with all technical approaches described in above and using them for dealing with various practical conditions, the risk of SOSC in a stope can be effectively controlled.

PL

W niniejszym referacie, opisane zostały niezawodne urządzenia oraz schematy działań służące do badania potencjalnego samozapalenia się rudy siarczanu (SOSC). Przedstawiona została skuteczna metoda oceny służąca oszacowaniu ryzyka SOS C w przodku, która zależy od systemu wskaźnika pożarowości. Aby uzyskać bardziej szczegółowe informacje dotyczące samoogrzewania się hałdy rudy w różnych okresach, temperatura powierzchniowa na hałdzie mierzona jest za pomocą przyrządu na podczerwień, natomiast temperatura wewnątrz hałdy analizowana jest przy użyciu oprogramowania typu ANSYS oraz FLUENT. Wyniki tych badań są widoczne i użyteczne w celu zastosowania odpowiednich środków zapobiegających powstawaniu ognia. Wynalezione również zostały środki chemiczne służące spowolnieniu procesu utleniania, które mogą zostać rozpylone po powierzchni hałdy. Połączenie oraz praktyczne wykorzystanie wszystkich wyżej opisanych metod, może zapewnić efektywne kontrolowanie ryzyka samoistnego zapalenia się rudy siarczanu w przodku.

13

Simultaneous state and parameter estimation based actuator fault detection and diagnosis for an unmanned helicopter

62%

Wu C. , Qi J. , Song D. , Qi X. , Han J.

International Journal of Applied Mathematics and Computer Science

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2015

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tom Vol. 25, no. 1

175--187

EN

Simultaneous state and parameter estimation based actuator fault detection and diagnosis (FDD) for single-rotor unmanned helicopters (UHs) is investigated in this paper. A literature review of actuator FDD for UHs is given firstly. Based on actuator healthy coefficients (AHCs), which are introduced to represent actuator faults, a combined dynamic model is established with the augmented state containing both the flight state and AHCs. Then the actuator fault detection and diagnosis problem is transformed into a general nonlinear estimation one: given control inputs and the measured flight state contaminated by measurement noises, estimate both the flight state and AHCs recursively in each time-step, which is also known as the simultaneous state and parameter estimation problem. The estimated AHCs can further be used for fault tolerant control (FTC). Based on the existing widely used nonlinear estimation methods such as the unscented Kalman filter (UKF) and the extended set-membership filter (ESMF), three kinds of adaptive schemes (KF-UKF, MIT-UKF and MIT-ESMF) are proposed by our team to improve the actuator FDD performance. A comprehensive comparative study on these different estimation methods is given in detail to illustrate their advantages and disadvantages when applied to unmanned helicopter actuator FDD.

14

Characterization of a novel transcript variant of human STAU1 gene

62%

Nie F. , Yao H. , Qi R. , Li X. , Wu C.

Acta Biochimica Polonica

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2008

|

tom 55

|

nr 3

473-478

EN

Human STAU1 is one member of the family of double-stranded RNA (dsRNA)-binding proteins. It is thought to function in transporting mRNA, controlling translation and eliciting mRNA decay in neurons, and to function in infection of influenza virus and human immunodeficiency virus type 1 (HIV-1). Four transcripts coding two isoforms have been identified before. In this study, we have isolated a novel transcript of STAU1, coding a novel isoform that has six amino acids more (SFPLKQ) than isoform a. In order to examine the tissue distribution of this novel isoform, we have performed RT-PCR experiments and the analysis showed that it was highly expressed in heart, liver, kidney and pancreas.

15

A novel approach to photonic generation of periodic triangular radio frequency waveforms

62%

Xiang P. , Guo H. , Chen D. , Zhu H. , Wu C.

Optica Applicata

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2015

|

tom Vol. 45, nr 3

381--391

EN

A novel approach to photonic generation of triangular radio frequency waveforms with a tunable repetition rate is proposed and analyzed. In the proposed system, a continuous-wave light is modulated by a reference microwave signal through a polarization modulator, and then its output optical sidebands are manipulated by a microwave photonic filter with a negative tap. By properly adjusting the system parameters, full-duty-cycle triangular radio frequency waveforms can be generated after optical-to-electrical conversion, and its repetition rate (frequency) can be tuned in a wide range. A model describing the proposed system is derived, which is verified via computer simulations.

16

Water environment characteristics at Taige Canal-Taihu Lake: a comparative study on interaction between chlorophyll alpha and environmental variables

54%

Jing L. , Ao H. , Huang X. , Xiong X. , Wu C. , Liu J.

Polish Journal of Environmental Studies

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2015

|

tom 24

|

nr 3

EN

River-lake connecting system (RLCS) plays an important role in controlling lake eutrophication due to its special geographical position and ecological significance. In addition, the pattern of phytoplankton variation and interaction between chlorophyll a and environmental variables are important for eutrophication management. To understand general water environment characteristics, including relationships between chlorophyll a and environmental variables in the Taige Canal-Taihu Lake system, a comparative study was conducted based on a two-year-long field investigation. This system was divided into a river region and a lake region based on cluster analysis. Investigated field data in the two regions were analyzed separately with principal component analysis (PCA) and stepwise multiple regressions for the relationships among water quality parameters. The spatial variation between the two regions can be found both in patterns of water quality parameters and relationships among them. Multivariate analysis showed that total phosphorous, chlorophyll a, and transparency were the main indicators of the spatial variations between the two regions. Relationships among water quality parameters showed that temperature and transparency were the primary environmental factors limiting phytoplankton growth in the river region. However, in the lake region phytoplankton may uptake phosphorus from sediments and its growth was limited by nitrogen during high-temperature seasons. Based on these characteristics, we suggested that reduction of nitrogen input and control of internal phosphorous loading was important for management of eutrophication in the studied area.

17

Effect of spermine on liver and spleen antioxidant status in weaned rats

54%

Liu G. , Cao W. , Jia G. , Zhao H. , Chen X. , Wang J. , Wu C.

Journal of Animal and Feed Sciences

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2016

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tom 25

|

nr 4

EN

Whereas strong antioxidant properties of spermine have been reported mostly in in vitro studies, there is lack of the in vivo studies on spermine influence conducted on mammals. The main objective of this study was to investigate the effects of different doses of spermine and the period of its supplementation on the liver and spleen antioxidant capacity in weaned rats. Male Sprague-Dawley rats at the age of 19 days received intragastrically spermine at the dose of 0.2 or 0.4 μmol · g-1 body weight for 3 or 7 days, respectively. Control rats received saline in analogical way. It was found that liver anti-superoxide anion (ASA) capacity, catalase (CAT) activity, glutathione (GSH) content and total antioxidant capacity (T-AOC) were increased in group supplemented with higher dose of spermine after 3 days, and anti-hydroxy radical (AHR) capacity was increased when treatment lasted for 7 days. In the spleen the higher spermine dose supplementation increased ASA capacity and total superoxide dismutase (T-SOD) activity (after 3 and 7 days), AHR capacity (after 7 days) and T-AOC (after 3 days) in comparison to the corresponding control groups (P < 0.05). Only in the spleen the lower spermine dose reduced lipid peroxidation level and increased CAT activity and GSH content regardless treatment duration (P < 0.05). The obtained results suggest that spermine supplementation can improve the antioxidant properties of the liver and spleen of weaned rats in a dose-, time- and tissue-dependent manner.

18

Problematyka ksztaltowania struktury uzytkowania ziemi w Chinach po wstapieniu do Swiatowej Organizacji Handlu

54%

Liang L. , Cao Y. , Wu C. , Chang J. , Zrobek S. , Belej M.

Acta Scientiarum Polonorum. Administratio Locorum

|

2003

|

tom 02

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nr 1-2

81-90

19

Allometric partitioning theory versus optimal partitioning theory: the adjustment of biomass allocation and internal C-N balance to shading and nitrogen addition in Fritillaria unibracteata (Liliaceae)

54%

Guo H. , Xu B. , Wu Y. , Shi F. , Wu C. , Wu N.

Polish Journal of Ecology

|

2016

|

tom 64

|

nr 2

EN

Fritillaria unibracteata is a classic perennial alpine herb. In this study, we examined it's responses to shading (SH) and nitrogen addition (NA), as well as its correlation with internal C-N balance to detect how it adjusted to the changes of habitat conditions. Randomized block experiment was carried out in the field in Chuanbeimu Research Station in Songpan County, Sichuan Province, China (32°09′54″N, 103°38′36″E, altitude 3300 m a.s.l.). Two growing seasons after NA and SH, Fritillaria unibracteata's total plant biomass decreased significantly, with the proportion of biomass allocated to aboveground significantly increased. In addition, in this study, under both SH and NA treatments, Fritillaria unibracteata increased its biomass allocation to above-ground, which consisted with optimal partitioning theory. Moreover, Fritillaria unibracteata's biomass allocation was significantly correlated with its internal C-N status, regardless of nitrogen and light condition. We conclude that Fritillaria unibracteata optimizes its biomass allocation between root and shoot by adjusting its internal C-N balance, which would not be changed by the specialized resource storage organ-bulb.

20

Neogambogic acid induces apoptosis of melanoma B16 cells via the PI3K/Akt/mTOR signaling pathway

54%

Wu C. , He J. , He J. , Sun Z. , Zha X. , Tang G.

Acta Biochimica Polonica

|

2020

|

tom 67

|

nr 2