Wyniki wyszukiwania - Biblioteka Nauki

1

On quasi convex functions and Hadamard's inequality

100%

Tseng K. , Tseng K. , Yang G. , Dragomir S.

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tom Vol. 41, nr 2

323-336

EN

In this paper we establish some inequalities of Hadamard's type involving Godunova-Levin functions, P-functions, quasi-convex functions, J-quasi-convex functions, Wright-convex functions and Wright-quasi-convex functions.

2

Leaf gas exchange, source–sink relationship, and growth response of cotton to the interactive effects of nitrogen rate and planting density

100%

Shah A. N. , Yang G. , Tanveer M. , Iqbal J.

Acta Physiologiae Plantarum

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2017

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tom 39

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nr 05

3

Observer-based fault-tolerant control against sensor failures for fuzzy systems with time delays

100%

Tong S. , Yang G. , Zhang W.

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tom Vol. 21, no 4

617-627

EN

This paper addresses the problems of robust fault estimation and fault-tolerant control for Takagi-Sugeno (T-S) fuzzy systems with time delays and unknown sensor faults. A fuzzy augmented state and fault observer is designed to achieve the system state and sensor fault estimates simultaneously. Furthermore, based on the information of on-line fault estimates, an observer-based dynamic output feedback fault-tolerant controller is developed to compensate for the effect of faults by stabilizing the resulting closed-loop system. Sufficient conditions for the existence of both a state observer and a fault-tolerant controller are given in terms of linear matrix inequalities. A simulation example is given to illustrate the effectiveness of the proposed approach.

4

Macroinvertebrate communities in recovery phase in the middle reaches of Chin's Huaihe River

88%

Chi S.-Y. , Zheng J.-X. , Yang G. , Li M. , Hu J.-H.

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tom 24

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nr 2

EN

After more than 10 years of treatments against water pollution, the water quality of the Huaihe River has improved considerably. At present, the river is in recovery phase. Two surveys on macro-invertebrates were carried out in the middle reaches in May and October 2010. Fifteen sampling stations were set up along the trunk, including Hongze Lake. Thirty-four species were recorded, and poor species and low biodiversity were the main community characteristics of this river. Significant differences in assemblages were found between the trunk and lake. Collectors were the chief functional feeding group in the trunk, while predators were the chief group in the lake. The species number in Hongze Lake decreased considerably compared to the historical data. Total phosphorus and temperature were important factors affecting the distribution of macroinvertebrates in the trunk, while pH, dissolved oxygen, and chlorophyll were the important factors in the lake. Sand mining, industrial and non-point pollution, and urbanization were the important factors causing degradation of whole aquatic ecosystems in the river basin. Two new alien species from the Yangtze River were first recorded in Hongze Lake, and the previous recorded alien species Nephthys sp. has spread into the whole lake and the trunk. Due to having similar histories of water pollution, the Huaihe would experience a process of recovery similar to the Rhine River.

5

The sensitive spectrophotometric method for the determination of cobalt with 2-(2-quinolinylazo)-5-diethylaminobenzoic acid

88%

Wang L. , Yang G. , Hu Q. , Yuan Z. , Yin J.

Chemia Analityczna

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2003

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tom Vol. 48, No. 4

767-773

EN

A sensitive, selective and fast method for the determination of cobalt using 2-(2-quinoliny-lazo)-5-diethylaminobenzoic acid (QADEAB) as chromogenic reagent has been described. QADEAB reacts with Co(II) in acetate buffer (pH 4.0) and cetyl trimethylammonium bromide (CTMAB) media to form a violet complex of a molar ratio of cobalt to QADEAB equal 1:2. Its molar absorptivity at 630 nm is 1.4 x l O(5) L mol(-1) cm(-1). Beer's law is obeyed for cobalt concentration ranging from 0.01 to about 0.32 (ug ml(-1).

PL

Opisano szybką, czułą i selekwtywną metodę oznaczania kobaltu stosując jako odczynnik chelatujący kwas 2-(2-chinolinylazo)-5-dietyloaminobenzoesowy (QADEAB). Odczynnik ten reaguje z jonami Co(II) w buforze octanowym o pH 4,0 w obecności bromku cetylotrimetyloamoniowego (CTMAB) tworząc fioletowo zabarwiony kompleks o molowym stosunku Co(II): QADEAB wynoszącym 1:2. Molowy współczynnik absorpcji wynosi 1,4 x10(5) L mol(-1) cm(-1) przy długości fali 630 nm. Prawo Beerajest spełnione w zakresie od 0,01 do 0,32 (ig mL(-1). Opracowaną metodę zastosowano z dobrym rezulatatem do oznaczania kobaltu.

6

Simulating N2O emission from Kobresia humilis Serg. alpine meadow on Tibetan Plateau with the DNDC model

88%

Du Y. , Cui X. , Cao G. , Zhao X. , Yang G.

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tom Vol. 59, nr 3

443-453

EN

Field measured N2O emissions in two years were used to parameterize and validate a process-based model, DNDC, for an alpine Kobresia humilis meadow on the Tibetan Plateau in China. Although this model failed to capture the N2O fluxes in some time periods in the spring or autumn, the modeled results showed overall a good performance in terms of simulating the seasonal variation of N2O fluxes and quantifying the annual total emissions. The relative deviation on the annual basis was about 12.4% and -15.9% for the two years, respectively. The modeled data showed that nitrification contributed about 53% of total N2O production, slightly higher than denitrification. The modeled fluxes were sensitive to soil organic content (SOC), pH, and temperature, but less sensitive to variation of precipitation, soil ammonium and nitrate contents. Further modifications for the model were suggested to focus on the process of soil freezing and thawing as well as the crop growth sub-model that would improve the model's performance for quantifying N2O emission from the alpine meadow.

7

Application of geostatistical analyst methods in discovering concealed gold and pathfinder elements as geochemical anomalies related to ore mineralisation

88%

Lindagato P. , Li Y. , Yang G. , Duan F. , Wang Z.

Geologos

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2018

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tom Vol. 24, No. 2

95--109

EN

The study area in the West Junggar Basin is known to be rich in hydrothermal gold deposits and occurrences, even though there has been minimum exploration in the area. It is here hypothesised that this area could host more gold deposits if mineral exploration methods were to be reinforced. This research is aimed at identifying geochemical anomalies of Au, and determining possible factors and conditions which facilitate the formation of anomalies by referring to As and Hg as gold pathfinders. Geostatistical analyst techniques have been applied to 9,852 stream sediments and bedrock data collected on a total surface of 1,280 km2 of West Junggar, Xinjiang (northwest China). The kriging interpolation and quantile-quantile plot methods, combined with statistical methods, successfully identified both Au and its pathfinders’ anomalies. In the present study, median was considered as background values (10.2 ppm for As, 9.13 ppb for Hg and 2.5 ppb for Au), whereas the 95th percentile were threshold values (28.03 ppm for As, 16.71 ppb for Hg and 8.2 ppb for Au) and values greater than thresholds are geochemical anomalies. Moreover, the high concentrations of these three discovered elements are caused primarily by hydrothermal ore mineralisation and are found to be controlled mainly by the Hatu and Sartohay faults of a northeast-southwesterly direction as well as their related secondary faults of variable orientation, which facilitate the easy flow of hydrothermal fluids towards the surface resulting in the formation of geochemical anomalies. Most of anomalies concentration of Au are found near the mining sites, which indicates that the formation of new Au anomalies is influenced by current or previous mining sites through geological or weathering processes. In addition, the low concentration of gold and its pathfinders found far from active gold mine or faults indicates that those anomalies are formed due to primary dispersion of hosting rock.

8

The Development of Drilling Engineering Monitoring System Using Wireless Sensor Networks

88%

Yang G. , Ma Z. , Xu W. , Huang X. , Zhou J.

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2013

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tom R. 89, nr 1b

37--40

EN

In order to avoid defects of existing drilling engineering monitoring and alarming system, such as the sensors and cable which are difficult to be installed and easy to be damaged, this paper present a new embedded drilling engineering monitoring system which is based on Wireless Sensor Network(WSN) and Wireless Local Area Networks(WLAN). The system is consists of the data acquisition subsystem, duty room controller, tool-pusher room controller and engineer room controller. It acquired the data and exported control commands by WSN. The tool-pusher room controller and engineer room controller are communicated with the duty room controller by WLAN for remote monitoring. For the special field drilling environment, the system achieves the acquiring, transmission, the export of control commands and remote monitoring of drilling data.

PL

Obecnie stosowany system monitorowania I alarmowania w technice wiercenia posiada szereg wad związanych z czujnikami i kablami, które trudno instalować i łatwo uszkodzić. Zaprezentowany w opracowaniu nowy system pozwala na uniknięcie tych wad. Oparty jest o bezprzewodową sieć czujnikową (WSN) oraz bezprzewodową sieć lokalną (WLAN). System obejmuje gromadzenie, transmisję danych i przekazywanie sygnałów sterowania oraz zdalne monitorowania danych wiercenia.

9

The intrabody targeting of hTERT attenuates the immortality of cancer cells

75%

Zhu X. , Yang N. , Cai J. , Yang G. , Liang S. , Ren D.

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tom 15

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nr 1

32-45

EN

hTERT (human telomerase reverse transcriptase) plays a key role in the process of cell immortalization. Overexpression of hTERT has been implicated in 85% of malignant tumors and offers a specific target for cancer therapy. In this paper, we describe an effective approach using a single-chain variable fragment (scFv) intrabody derived from monoclonal hybridoma directed against hTERT to attenuate the immortalization of human uterine cervix and hepatoma cells. The scFv we constructed had a high affinity to hTERT, and specifically neutralized over 70% of telomere synthesis activity, thereby inhibiting the viability and proliferation of the cancer cells. Our results indicate that this anti-hTERT intrabody is a promising tool to target hTERT and intervene in the immortalization process of cancer cells.

10

Sitefidelity and association patterns of Indo-Pacific humpback dolphins off the east coast of Zhanjing, China

75%

Xu X. , Zhang Z. , Ma L. , Li P. , Yang G. , Zhou K.

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tom 57

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nr 2

EN

This study examined the population of Indo-Pacific humpback dolphins, Sousa chinensis, inhabiting the waters off the east coast of Zhanjiang, China. A total of 116 dolphins were identified during 147 boat-based surveys, completed between June 2005 and June 2007. Abundance estimates indicated that a small population of 268 dolphins (95% CI = 189–413) inhabited this coastal area. The sighting frequencies of identified dolphins varied between one and five when the 2006 and 2007 data were organized into six occasions. Twenty-three percent (27 individuals) of the cataloged dolphins were identified in more than one calendar year. The two animals (ZJ001, ZJ011) with the highest degree of site fidelity were present in the study area for a period of 23 months. The most frequently (15 times) sighted dolphin (ZJ046) was recorded in nine (56%) of the 16 months surveyed. This evidence indicates the interannual site fidelity of S. chinensis to the area off the eastern coast of Zhanjiang City. Range sizes of eight identified individuals calculated by the minimum convex polygon varied from 2.07 to 331.20 km2. Associations between 34 individuals sighted at least three times and more than three times were measured by the half-weight index and SOCPROG program. The majority of these dolphins (80.57%) were not seen together during surveys and the mean association rate between dyads was low at 0.05. Temporal analyses for all the individuals were conducted using a lagged association rate. The results indicated a non-random social structure made by constant companions.

11

Knitted silk mesh-like scaffold incorporated with sponge-like regenerated silk fibroin/collagen I and seeded with mesenchymal stem cells for repairing Achilles tendon in rabbits

75%

Tang L. , Yang Y. , Li Y. , Yang G. , Luo T. , Xue Y. , Zhang W.

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tom Vol. 20, no. 3

77--87

EN

A scaffold knit with natural sericin-free silk fibroin fiber possesses desirable mechanical properties, biocompatibility, ease of fabrication, and slow degradability. However, regenerated silk fibroin degrades faster than natural silk. In this study, natural silk fibroin fiber mesh-like scaffolds were prepared by a weft-knitting method and the pores were filled with sponge-like regenerated silk fibroin-collagen I. The microporous sponge and mesh-like scaffolds were fused to achieve gradient degradation of the scaffolds, and rabbit bone marrow mesenchymal stem cells (BMSCs) were seeded onto the scaffolds to form scaffold–BMSCs composites. The composites were implanted into gap defects made in the rabbit Achilles tendon. Twenty weeks after implantation, histological observation showed that tendon-like tissue had formed, collagen I mRNA was expressed, abundant collagen was generated, and that there was no obvious degradation of silk. The maximum load of the neo-Achilles tendon was 62.14% that of the natural Achilles tendon. These outcomes were superior to those obtained in the group implanted with a scaffold without BMSCs. These findings suggest the feasibility of constructing tissue-engineered tendons using weft-knitted silk scaffolds incorporated with sponge-like regenerated silk fibroin/collagen I and seeded with BMSCs, and show potential of the scaffold–BMSCs composites to repair Achilles tendon defects.

12

Soil nematode trophic groups in four different plantations in southern China: implications for restoration

63%

Zhao C. , Sun F. , Yu C. , Zhu L. , Li Y. , Zhou Z. , Yang G. , Wang W. , Miao R.

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nr 3

EN

Intensive anthropogenic disturbances have caused forest ecosystem degradation and soil erosion. Exotic fast-growing species are selected as pioneer species for restoration in degraded hilly lands of southern China. To better understand the potentials of the soil nematode trophic group composition in carbon sequestration, we investigated nematode trophic groups in Acacia, Eucalyptus, and Schima (native species as control) monoculture plantations in southern China after 23 years of reforestation. Our results showed that although total soil nematode abundance was not affected, the Acacia plantation significantly altered nematode trophic group composition over native species. Bacterivore and microbivore abundance, trophic diversity, and microbivore-driven soil organic carbon storage were higher in Acacia mangium than Schima superba. In contrast, plant parasitic nematode abundance and fungivore/bacterivore ratio were lower in Acacia mangium than Schima superba. As a result, Acacia mangium as a fast-growing pioneer tree species could be widely planted to maintain soil biodiversity and store carbon in restoring degraded forests in southern China. Eucalyptus exserta plantation enlarged the soil nematode community, including bacterivores, fungivores, and herbivores, suggesting that there is almost no allelopathy when eliminating anthropogenic disturbance in this study. Reasonable management is crucial for providing timber products and improving the ecological function of Eucalyptus plantations. Our results also highlight the critical roles of soil water and nutrient availability in regulating soil nematode trophic group composition and carbon sequestration.

13

Interactive effect of radioactive and heavy-metal contamination on soil enzyme activity in a former uranium mine

63%

Yang G. , Dong F. , Liu M. , Nie X. , Zong M. , Peng C. , Chen H. , Wei H. , Wang P. , Zhang W.

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nr 3

EN

Radioactivity and heavy metal toxicity of multi-metal deposits coexisting with the element uranium (U) could have long-term adverse impacts on soil biological processes and the health of soil ecosystems. Soil enzyme activities are considered bioindicators for assessing soil health. An experiment was designed to investigate invertase and ß-glucosidase activity in multi-metal deposits. Radioactivity and heavy metals were also investigated during this study. Our results showed that the invertase and ß-glucosidase activities were significantly lower in the core mining area than the control area (p<0.05). Activities of the two enzymes decreased with increasing metal concentrations and radioactivity. Cu and Zn showed significant negative effects on ß-glucosidase and invertase activities in a multi-metal deposit at the study site. A significant nonlinear relationship was recorded between soil enzyme activities, radiation dose (R² = 0.71, 0.63; p<0.05), Zn (R² = 0.34, 0.41; p<0.05) and Cu concentrations (R² = 0.46, 0.45; p<0.05). There were turning points at 1 μGy h⁻¹, 250 μg g⁻¹, and 30 μg g⁻¹ for radiation dose, Zn and Cu contents, respectively. The findings could provide more information regarding the toxic effects of radiation and heavy metals on the soil health of multi-metal deposits, which can more precisely guide environmental protection.