Wyniki wyszukiwania - Biblioteka Nauki

1

Nietypowy przypadek psa z bolesną, zaczerwienioną gałką oczną

100%

Gionfriddo J. R. , Chen T.

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nr 6

2

Responses of Pigmentation and delta13C in Qilian juniper to cold and drought stresses under natural conditions in the Qilian Mountains, China

100%

Wen L. , Chen T.

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tom 36

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nr 08

EN

The seasonal changes of pigments and stable carbon isotope composition (δ¹³C values) were investigated in needles of Qilian juniper (Sabina przewalskii Kom.) from two typical sites, one drier and the other wetter, in the Qilian Mountains, China. The anthocyanins and rhodoxanthin content from both sites were much higher in winter than in summer. Plant needles contained more carotenoids and xanthophylls in winter at the wetter site, while no seasonal difference appeared at the drier site. However, lower chlorophyll content and higher proline and δ¹³C were observed at the drier site. Average tree height was shorter at the drier site trees than at the wetter site. Our results suggested that under natural conditions, pigmentation in S. przewalskii may serve to improve the energy balance of the photosynthetic apparatus under cold and drought stresses. Proline and δ¹³C could be used as drought indicators for S. przewalskii.

3

Analytical Models for Distribution of the Envelope and Phase of Linearly Modulated Signals in AWGN Channel

80%

Moazzeni T. , Jiang Y. , Selvaraj H. , Chen T.

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tom Vol. 60, No. 1

79-82

EN

In this paper, analytical expressions for the distribution of the envelope and phase of linearly modulated signals such as BPSK, M-PSK, and M-QAM in AWGN are presented. We perform numerical simulations for different orders of signal constellations. The results show that the proposed theoretical models are in excellent agreement with the estimated distributions from various numerical experiments.

4

Study of Polyaspartic acid and chitosan complex corrosioninhibition and mechanisms

80%

Chen T. , Zeng D. , Zhou S.

Polish Journal of Environmental Studies

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2018

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tom 27

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nr 4

EN

Polyaspartic acid/chitosan complex (PASP/CS) was synthesized by the reaction of Polyaspartic acid, chitosan, and glutaraldehyde. The graft copolymer (PASP/CS) was characterized by FT-IR. The inhibition corrosion efficiency of the complex was estimated as 83.5%, PASP and only 58.8% when inhibitor concentration was 8 mg/L. PASP/CS is an anodic corrosion inhibitor in Sodium Chloride Solution. The competitive adsorption of chloride ions and PASP/CS in water can form a layer of dense molecular film on the carbon steel surface composite with a non-location effect. PASP/CS combination can effectively inhibit the corrosion in the carbon steel system. The steel surface morphology was analyzed using scanning electron microscopy (SEM) and an adsorption mechanism model is proposed. The high inhibition efficiency of PASP/CS is related to the adsorption of polymer molecules on the steel surface and the formation of a protective film that can successfully inhibit the erosion of corrosive media and prevent the corrosion of carbon steel in the process.

5

Smarter way to build: volumetric modular construction system

80%

Wozniak-Szpakiewicz E. , Zhao S. , Chen T.

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tom nr 25

73--80

EN

The article deals with the problem of increasing demand for modular buildings as an answer to the construction industry’s current situation and challenges of build environment. The case studies refer to the hospitality and student living sector. The author addresses the following question regarding the near future of the modular construction industry: How would it reflect on urban space, living space and the whole attitude toward modular construction issues? What is the role of the architect during the design-build process? Is it possible to make references to “beauty” in a modular construction context?

PL

Artykuł podejmuje problematykę rosnącego popytu i zapotrzebowania na realizację obiektów w oparciu o wolumetryczną technologię modułową jako odpowiedź na potrzeby zrównoważonego rozwoju. Jako przykłady wskazuje autor wskazuje obiekty hotelowe i obiekty zamieszkania studenckiego. Autor stawia pytanie o przyszłość budownictwa modułowego. Jaki wpływ będzie ono miało na kształtowanie przestrzeni miejskiej i na przestrzeń życiową? Jaka jest rola architekta podczas procesu zaprojektuj-wybuduj? Czy możliwe jest odniesienie wartości „piękna” do rozwiązań w systemie modułowym?

6

The complexity of a small town

80%

Chen T. , Kobylarczyk J. , Krupa M. , Kuśnierz-Krupa D.

Technical Transactions

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2018

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tom Vol. 115, iss. 3

5--20

EN

The article presents deliberations about a small city as a desirable living environment of a multi-layered character focusing on sociological issues that take into account the lifestyle of the residents and their preferences. Environmental studies, which reflected the expectations of the residents regarding their living environment, proved to be very important for the matter of the paper. Another issue related to small cities is the architecture responsible for the vitality of the place, its character and intimacy. It often determines the attractiveness of the centre, its history and culture. The considerations provided by the authors were supported by urban analyses, interviews, literature studies and own observations regarding selected urban centres located in the Podkarpackie Voivodeship.

PL

W artykule przedstawiono rozważania na temat małego miasta jako pożądanego środowiska zamieszkania o wielowątkowym charakterze skupiającym zagadnienia socjologiczne uwzględniające styl życia mieszkańców oraz ich preferencje. Dla tej części rozważań istotne okazały się badania środowiskowe, których wyniki odzwierciedliły oczekiwania mieszkańców względem ich środowiska zamieszkania. Drugi wątek towarzyszący małym miastom to architektura odpowiadająca za żywotność miejsca, jego nastrój oraz kameralność. Niejednokrotnie decyduje o atrakcyjności ośrodka, jego historii i kulturze. Wskazane rozważania podparte zostały analizami urbanistycznymi, wywiadami, studiami literatury oraz własnymi spostrzeżeniami dotyczącymi wybranych miast zlokalizowanych w województwie podkarpackim.

7

Sex-dependent changes in cerebellar thyroid hormone-dependent gene expression following perinatal exposure to thimerosal in rats

71%

Khan A. , Sulkowski Z. L. , Chen T. , Zavacki A. M. , Sajdel-Sulkowska E. M.

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nr 3

8

Simulating and predicting of hydrological time series based on TensorFlow deep learning

71%

Qin J. , Liang J. , Chen T. , Lei X. , Kang A.

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nr 2

EN

Hydrological time series refers to the observation time point and the observed time value. The simulation and prediction of hydrological time series will greatly improve the predictability of hydrological time series, which is of great significance for hydrological forecasting. TensorFlow, the second generation of artificial intelligence learning system in Google, has been favored by a large number of researchers by virtue of its high flexibility, portability, multi-language support, and performance optimization. However, the application of deep learning in hydrology is less. Based on the TensorFlow framework, the AR model and the LSTM model are constructed in Python language. The hydrological time series is used as the input object, and the model is deeply studied and trained to simulate and predict the hydrological time series. The effect of the model was tested by fitting degrees and other indexes. The fitting degree of the AR model is 0.9551, and the fitting degree of the LSTM model is 0.8012, which shows the feasibility of the model for predicting the hydrological time series, and puts forward the solution for the limitation of the existing analysis results.

9

Spatio-temporal assessments of rockburst hazard combining b values and seismic tomography

61%

Li J. , Gong S.-Y. , He J. , Cai W. , Zhu G.-A. , Wang C.-B. , Chen T.

Acta Geophysica

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2017

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tom Vol. 65, no. 1

77--88

EN

A better understanding of rockburst precursors and high stress distribution characteristics can allow for higher extraction efficiency with reduced safety concerns. Taking the rockburst that occurred on 30 January 2015 in the Sanhejian Coal Mine, Jiangsu Province, China, as an example, the mechanism of rockburst development in a roadway was analysed, and a combined method involving b values and seismic velocity tomography was used to assess the rockburst in both time and space, respectively. The results indicate that before the rockburst, b values dropped significantly from 0.829 to 0.373. Moreover, a good agreement between a significant decrease in b values and the increase of the number of strong tremors was found. Using seismic tomography, two rockburst risk areas were determined where the maximum velocity, maximum velocity anomaly and maximum velocity gradient anomaly were 6 km/s, 0.14 and 0.13, respectively. The high-velocity regions corresponded well with the rockburst zone and large seismic event distributions. The combination of b values and seismic tomography is proven to have been a promising tool for use in evaluating rockburst risk during underground coal mining.

10

Changes of mitochondrial pathway in hypoxia-reoxygenation induced cardiomyocytes apoptosis

61%

He A. , Wang J. , Gui C. , Jiang Y. , Sun Y. , Chen T.

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nr 4

397-400

11

Long-term variation of tree growth and intrinsic water-use efficiency in Schrenk spruce with increasing CO2 concentration and climate warming in the western Tianshan Mountains, China

61%

Wu G. , Liu X. , Chen T. , Xu G. , Xu G. , Wang W.

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nr 08

EN

We combined dendrochronological methods and interannual d13C measurements to investigate radial growth and physiological responses of Schrenk spruce (Picea schrenkiana) in response to rising atmospheric CO2 concentration (Ca) and changing climate in high-elevation forests in China’s western Tianshan Mountains. The mean maximum temperature in May to August, reconstructed from d13C, revealed an overall warming trend, with persistent warm periods from 1910 to 1920, and from 1970 to 1980. Intrinsic water use efficiency (iWUE) increased by 28 % over the last 160 years; temporal trends in iWUE were calculated under three theoretical scenarios as a baseline for interpreting the observed gas-exchange at increasing Ca. Basal area increment (BAI) increased by 51.4 % since 1850 with two apparent increases and decreases. Trees exhibited sharp declines in BAI along with enhanced iWUE during the warmer periods; this was possibly due to a reduced stomatal conductance which prevented excessive water loss from trees. Conversely, BAI increased at reduced iWUE (-3.6 %, -7.4 %) during two cold-wet periods (e.g., 1880 to 1992, and 1945 to 1960), suggesting that a diminished water stress caused the observed growth pattern. However, BAI increased significantly (49.4 %) from 1965 to 1983 with constant intercellular atmospheric CO2 concentrations (Ci) response scenario under acute water limitations, indicating the CO2 stimulation of tree growth. These results showed that even at high elevations, increased iWUE may not lead to longterm enhancement of tree growth, and other factors may counteract CO2-fertilization effects, especially those related to a warming-induced drought. The results of this study suggest that the current models may overestimate the sink capacity of temperate forests, and indicate that multi-proxy records are needed to disentangle the role of a limiting factor in modulating the response of the Schrenk spruce forest to current climate change scenarios.

12

The effect and implication of human disturbances on altitudinal variation of non-structural carbohydrates in Kobresia pygmaea

61%

Zhao Z. , Zhang Y. , Chen T. , Cui X. , Wu Q. , An L.

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nr 09

EN

Non-structural carbohydrates in plant organs can mirror the plant overall carbon supply status and balance and can also provide evidence for their health evaluation in the ecosystem. Non-structural carbohydrates in Kobresia pygmaea, one dominant herbaceous species on the Qinghai-Tibetan Plateau, were measured to investigate altitudinal variation in non-structural carbohydrate accumulations, as well as engineering disturbance on the stability of the alpine grassland ecosystem. An increasing trend with elevation in total soluble sugars, fructose, and sucrose was detected in the K. pygmaea growing in both undisturbed and disturbed sites. However, there were higher amounts and a more distinctly altitudinal trend of non-structural carbohydrates with a minor fluctuation in undisturbed sites compared to disturbed sites. In addition, the altitudinal trend of sucrose is similar to that in sucrose phosphate synthase and sucrose synthase activities, while it is opposite to that in neutral invertase and soluble acid invertase activities, suggesting that the sucrose accumulation was primarily related to its synthesis. These results revealed that human disturbance resulted in a reduced carbon supply and altered the balance of carbohydrate utilization in plants on the Qinghai-Tibetan Plateau.

13

Increasing nitrogen use efficiency with lower nitrogen application frequencies using zeolite in rice paddy fields

61%

Wu Q. , Chen T. , Chi D. , Xia G. , Sun Y. , Song Y.

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nr 2

14

Study of aluminum phosphide levels in waste fumigants from food shipments following simple immersion treatment

61%

Wu G. , Chen T. , Jia Y. , Shen D. , Feng H. , Long Y.

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tom Vol. 44, nr 1

19--27

EN

Increasing concentrations of aluminum phosphide (AlP) in waste fumigants and residues pose a serious threat to human health. This study focused on the effectiveness of the widely used simple immersion treatment for waste fumigants from shipments, which usually have a higher concentration of residual AlP. A field survey of an operational process was conducted followed by a quantitative analysis of the immersion treatment's hydrolytic effect on AlP. Further investigation on the safety of waste fumigants after the immersion treatment was conducted. It was found that the AlP concentration in the waste fumigant varied significantly with the sampling date, ranging from 12.93 +/- 0.67 wt. % to 29.50 +/- 1.18 wt. %. Simple immersion treatment could reduce the concentration of residual AlP in waste fumigants but the hydrolytic effect varied largely ranging from 19.5% to 31.9%. The concentration of residual AlP remained high (9.1-20.1 wt. %) after the immersion treatment. About 3.2-15.2 wt. % of AlP remained in the samples, following an additional 40 days of natural air-drying when phosphine gas release was not detected. The study indicates that conventional simple immersion treatment cannot ensure the complete hydrolysis of AlP from waste fumigants of shipments.

15

A novel semidwarf mutant 02428ha in rice is caused by reduced gibberellin sensitivity

51%

Zhang S. , Chen R. , Zhao L. , Zhu Z. , Zhang Y. , Chen T. , Zhang H. , Shen Z. , Wang C.

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nr 1

EN

The rice (Oryza sativa L.) elongated uppermost internode (eui) gene effectively results in a recessive tall plant type. In eui background, we found a mutant 02428ha that exhibited a semidwarf phenotype. Because semidwarf varieties possess high yield potential, this mutant may be useful for hybrid rice breeding. The present study aimed to characterize the dwarfing mechanism in the mutant. Microscopic observation revealed that the cell length in the uppermost internode was reduced compared to the wild type. The mutant showed a decreased sensitivity to exogenous gibberellin A₃ (GA₃) and gibberellin (GA) biosynthesis inhibitor, uniconazole. Meanwhile, it contained a high level of endogenous gibberellin A₁ (GA₁). These results indicated that the semidwarf phenotype of 02428ha was caused by impairment of GA signal transduction rather than by block in GA biosynthesis. Furthermore, expression analysis of genes involved in the GA signaling pathway showed that transcript of GIBBERELLIN INSENSITIVE DWARF2 (GID2) was down-regulated in the mutant. Sequence analysis also revealed a 15-base pair (bp) insertion between base 594 and 595 in the coding region of GID2. Consequently, the reason for down-regulation expression of GID2 or sequence variation of GID2 might play roles in the phenotype of 02428ha.

16

The positive contribution of iWUE to the resilience of Schrenk spruce (Picea schrenkiana) to extreme drought in the western Tianshan Mountains, China

51%

Wu G. , Liu X. , Chen T. , Xu G. , Wang B. , Kang H. , Li C. , Zeng X.

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tom 42

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nr 11