Wyniki wyszukiwania - Biblioteka Nauki

1

Environmentally degradable plastics and waste management

100%

Miertus S. , Ren X.

Polimery

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2002

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tom T. 47, nr 7-8

545-550

EN

The paper gives a general introduction about international ffort, exemplified by activities at ICS-UNIDO, in the field of nvironmentally degradable plastics (EDPs). These activities nd projects reveal some major problems that concern both ndustry and the society. Standardization, availability of enewable and non-renewable resources for production of EDPs, ntegration of policies and regulations relevant to waste anagement and EDPs, life cycle approach and Eco-design of roduct are identified as key issues for EDPs promotion and arge scale application. A discussion on strategy toward these ssues is presented.

PL

Na tle działalności International Centre for Science and High Technology (ICS-UNIDO - mieszczące się w Trieście Międzynarodowe Centrum Nauki i Zaawansowanej Technologii będące instytucją działającą w ramach UNIDO, czyli United Nations Deve-lopmcnt Organization - Organizacji Rozwoju Narodów Zjednoczonych) scharakteryzowano międzynarodowe prace w dziedzinie EDP. Omówiono problemy związane z normalizacją (np. biodegra-dowalność, jakość kompostu, biogazyfikacja anaerobowa) oraz rozpatrzono odnawialne i nieodnawialne źródła EDP. Przedstawiono także powiązanie EDP z gospodarką odpadami (zagadnienia recyklingu, odzyskiwania energii, kompostowania, składowania odpadów), rozważając możliwość wprowadzenia w przypadku EDP zintegrowanego systemu takiej gospodarki oraz oceny ich "cyklu życia".

2

Morphological study of the hoof in yak

80%

Yang X. , Ren X. , Yu S. , Cui Y.

Folia Morphologica

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2016

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tom 75

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nr 3

EN

The fore- and hindlimb of yak have been studied by the gross anatomical methods and standard histological techniques. The artery of ungula was also determined by X-ray and acrylonitrile-butadiene-styrene casting. Anatomical features of the forelimb of yak resemble those of hindlimb, including hoof periphery, hoof coronal, hoof wall, hoof sole, and hoof sphere. The forelimb and hindlimb are almost the same in histological structure. The epidermis comprised all 5 strata: stratum corneum, stratum lucidum, stratum granulosum, stratum spinosum and stratum basale. The papillary layers and dermal lamellae contained a variable amount of capillary as well as collagen and elastic fibres. Many venules and arteriovenous anastomosis were distributed among the reticular layer. Subcutaneous tissue was composed of rich adipose and connective tissue in hoof periphery, hoof coronal, and, especially, hoof sphere. Major arteria in forelimb of yak include arteria digitalis palmaris communis III and arteriae digitales palmares propriae III and IV axialis. Those in hindlimb include arteria digitalis plantaris communis III and arteria digitalis plantaris propria III and IV axialis. Our findings highlight the main morphological features of yak and provide a morphological basis useful to researchers using yak hoof. (Folia Morphol 2016; 75, 3: 400–408)

3

Effects of Holding Conditions on Microstructure of Al-5Ti-1B and Its Refining Efficiency on Al-Cu Alloy

80%

Huang Y. , Shao H. , Xiao Z. , Ren X.

Archives of Metallurgy and Materials

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2018

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tom Vol. 63, iss. 2

647--652

EN

A series of Al-5Ti-1B master alloys were obtained via fluoride salt process by holding them between 780°C and 880°C for 10-90 min. The influence of holding temperature and time during preparation on the microstructure and its refining performance were investigated by X-ray diffractometer, optical microscopy and scanning electron microscopy equipped with energy dispersive X-ray spectroscopy. The results indicated both the morphology and the distribution of TiB22and Al3Ti were seriously affected by holding conditions. Inadequate TiB2 particles were generated when holding time was short. However, Fe-containing impurity particles that aggregated along the matrix grain boundaries were found after the prolonged holding time. The refining and microhardness test results revealed that Al-5Ti-1B, the one held at 820°C for 30 min showed the optimum refining efficiency on Al-Cu alloy.

4

Numerical simulation study on exposed reinforced anti-corrosion layer damage of the cross-sea bridge under the marine environment

80%

Qu H. , Su J. , Huang P. , Ren X.

Polish Maritime Research

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2017

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tom 24

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nr Special Issue S3

EN

To solve the problem of low precision of numerical simulation of the exposed reinforced anti-corrosion layer damage of the cross-sea bridge, we use the stress ratio between the double slash and the reinforced anti-corrosion layer to analyze the parameters and the damage rate in different qualities of reinforced anti-corrosion layers, use Ansys software to build reinforced finite element model, and analyze the damage degree when the inclination angle was 15 °, 45 ° and 60 °, respectively. The experimental results showed that the proposed method can improve the numerical simulation efficiency, the numerical simulation results, the experimental results, and the theoretical analysis results have good consistency and stability

5

Downregulation of long non-coding RNA ZXF1 restricts cell survival by targeting miR-634-GRB2 in lung adenocarcinoma

80%

Ren X. , Xu N. , Zhang Y. , Wang T.

Acta Biochimica Polonica

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2020

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tom 67

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nr 1

6

Numerical simulation study on exposed reinforced anti-corrosion layer damage of the cross-sea bridge under the marine environment

80%

Qu H. , Su J. , Huang P. , Ren X.

Polish Maritime Research

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2017

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tom S 3

207--212

EN

To solve the problem of low precision of numerical simulation of the exposed reinforced anti-corrosion layer damage of the cross-sea bridge, we use the stress ratio between the double slash and the reinforced anti-corrosion layer to analyze the parameters and the damage rate in different qualities of reinforced anti-corrosion layers, use Ansys software to build reinforced finite element model, and analyze the damage degree when the inclination angle was 15 °, 45 ° and 60 °, respectively. The experimental results showed that the proposed method can improve the numerical simulation efficiency, the numerical simulation results, the experimental results, and the theoretical analysis results have good consistency and stability.

7

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

80%

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.

8

Heat transfer enhancement of graphite–modified concrete energy piles

80%

Guo H. , Qiao L. , Xiao Y. , Ren X.

Journal of Power Technologies

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2018

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tom Vol. 98, nr 4

345--351

EN

Designed for utilizing the ground-source systems for heating and cooling, the use of energy piles in commercial and residential buildings has increased exponentially especially in Europe. The heat transfer efficiency of energy piles may directly influence the energy-saving effect on buildings. Apart from the optimization of pipe laying, many other factors can also influence the heat transfer efficiency of energy piles. In this study, a new method that can increase the heat transfer efficiency of energy piles was proposed to explore the influences of adding graphite powder with high thermal conductivity to pile concrete on the heat transfer efficiency of energy piles. The thermal resistance models of energy piles in three different pipe-burying modes were constructed by combining the 2D plane method and the heat transfer mechanism of energy piles. The internal heat transfer characteristics of energy piles at different temperatures, graphite contents, and pipe-burying modes were discussed by combining the indoor thermal conductivity test of graphite-modified concrete. The external heat transfer characteristics of graphite-modified concrete energy piles were analyzed through numerical simulation analysis. Results demonstrate that the increase in graphite contents is beneficial to heat transfer in energy piles. In particular, thermal conductivity significantly increases when the graphite content exceeds 5%. The high temperature in the pipe is also conducive to the thermal conductivity of the energy pile. The thermal conductivity of the concrete samples with 8% graphite content in an environment at 40°C is 1.35 times that at 20°C. The heat transfer efficiency of the spiral coil-type energy pile is higher than those of single-U and double-U tube energy piles. The proposed method provides a certain reference for improving the heat transfer efficiency of energy piles and constructing the internal and external heat transfer models in energy piles.

9

Applications of digital technology for the morphological study of C3–C7 vertebral arch pedicle in children

71%

Zhang S. , Wang X. , Ren X. , Li Z. , Zhang Y.

Folia Morphologica

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2017

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tom 76

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nr 3

EN

Background: This study aims to investigate the morphological characteristics and developmental patterns of the vertebral arch pedicle (VAP) in the lower cervical vertebrae of children, and to subsequently help guide the implantation of the pedicle screw. Materials and methods: The cervical vertebral multi-slice computed tomography (MSCT) data of 60 paediatric patients aged 4–12 years were collected and grouped. A reconstructed 3-dimensional model measured the following: pedicle width (PW), pedicle height (PH), pedicle osseous channel (POCL), pedicle transverse angle (PTA, namely the E angle), and pedicle sagittal angle (PTA, namely the F angle). Results: We calculated the ratio of PW/PH (I value) to assess the statistical difference between age groups and segments. The PW, PH, POCL, and E angles exhibited an overall increasing trend with increasing age. The PW, PH, and POCL of each vertebra in group C showed statically significant differences compared to groups A and B (p < 0.05). The PW of different vertebral sequences in each group showed a gradually increasing trend. The intervertebral F angle among different groups showed the biggest difference, a change from positive values to negative values gradually, among which the negative value of C7’s F angle was the largest. The I value exhibited an overall decreasing trend with increasing age. Conclusions: The morphological characteristics and development of the different pedicle segments exhibited obvious patterns. In the lower cervical vertebrae of children over 7 years of age, the vertebrae had the feasibility for the implantation of pedicle screws. (Folia Morphol 2017; 76, 3: 426–432)

10

Temperature affects morphology, physiology, and biochemistry of plug seedlings of Astragalus membranaceus

71%

Ren X. , Liu Y. , Jeong H. K. , Soundararajan P. , Jeong B. R.

Acta Physiologiae Plantarum

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2019

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tom 41

|

nr 01

11

Piezoelectric effect on thermoelastic Lamb waves in functionally graded plates

61%

Wang X. , Ren X. , Yu J. , Zhou H. , Zhang X. , Leng J.

Archives of Mechanics

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2023

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tom Vol. 75, nr 1-2

3--26

EN

Based on the Lord–Shulman thermoelectric elasticity theory, the piezoelectric effect on the thermoelastic Lamb wave propagation in the functionally graded material (FGM) plate is investigated. The coupled wave equations are solved by employing the Legendre polynomial series approach (LSPA), which poses the advantages of small scale of eigenvalues matrix and a convenient solution. It can directly obtain the complex wave number solutions without iteration. The obtained complex solutions, which represent the wave propagation and attenuation, are compared with those available data. Numerical examples show that the influence of gradient is profound. Results indicate that the piezoelectric effects on attenuation with the open and closed circuit condition are consistent for the S0 and S1 modes, but are inconsistent for the A0 and A1 modes. Although the piezoelectric effect is weak on the dispersion and attenuation of thermal waves, it is notable for their physical field distributions. In addition, the relaxation time is critical to electric displacements of a thermal wave mode, but is not essential for those of Lamb-like modes. The results can be used for the optimization of thermo-electric-elastic coupling structures.

12

Interaction of abscisic acid and auxin on gene expression involved in banana ripening

61%

Lu W. , Mao L. , Chen J. , Han X. , Ren X. , Ying T. , Luo Z.

Acta Physiologiae Plantarum

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2018

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tom 40

|

nr 03

13

Relations between microtopography and soil N and P observed by an unmanned aerial vehicle and satellite remote sensing (GF-2)

61%

Lou H. , Ren X. , Yang S. , Hao F. , Cai M. , Wang Y.

Polish Journal of Environmental Studies

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2021

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tom 30

|

nr 1

14

The phytochrome-interacting family of transcription factors in maize (Zea mays L.): identification, evolution, and expression analysis

61%

Gao Y. , Ren X. , Qian Y. , Li Q. , Tao H. , Chen J.

Acta Physiologiae Plantarum

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2019

|

tom 41

|

nr 01

15

Evolution and driving forces of non-point source pollution in a developing megacity: Beijing as a long-term case study

51%

Lou H. , Yang S. , Hao F. , Ren X. , Zhao C. , Wang Y. , Lei T. , Sun F.

Polish Journal of Environmental Studies

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2020

|

tom 29

|

nr 1

16

Comparison of the ossification centre images between standard computed tomography and micro-computed tomography

51%

Wang W. , Wang X. , Ren X. , Chen L. , Li Z. , Li X. , Zhang P. , Gao J. , Su B. , Zhang S.

Folia Morphologica

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2020

|

tom 79

|

nr 1

EN

Background: Based on standard computed tomography (CT) and micro-CT scan axis images, our study aims to analyse the incidence of variation of non-fusion ossification centre in the base of the odontoid and its anatomical structure characteristics, to compare ossification centre images and analyse the possible features of the ossification centre that can influence adult odontoid fractures. Materials and methods: Fifty cases were selected for standard cervical CT of the normal axis bone (second cervical) anatomy to calculate the incidence of variation of the non-fusion ossification centre in the base of the odontoid and the indexes of associated anatomical structure. In addition, five dry bone samples with the odontoid were chosen for micro-CT to analyse the clear anatomic structure of the trabecular bone in the ossification centre. Results: Incidence of variation of non-fusion ossification centre in the base of the odontoid was 28%. In the non-ossification group, the mean sagittal diameter of the base of odontoid (SDBO, mm) was 7.64 ± 1.29 mm, the mean transverse diameter of the base of odontoid (TDBO, mm) was 7.14 ± 1.55 mm, and the SDBO:TDBO ratio was 1.1 ± 0.22. In the ossification group, the mean SDBO was 7.7 ± 1.15 mm, the mean TDBO was 7.38 ± 1.32 mm, and the SDBO:TDBO ratio was 1.07 ± 0.21. There was no significant difference in the associated indexes between the ossification and non-ossification groups (p > 0.05). Micro-CT revealed the micro-structure of trabecular bone in the ossification centre and the close relationship between the trabecular bone and the odontoid. One existing non-ossification centre in the base of the odontoid was found in the five odontoid images. The trabecular bone indexes chosen in the target area of the ossification centre were weaker than those in other areas. Conclusions: The variation rate of the non-fusion ossification centre in the base of the odontoid is relatively high and may be an important factor in the aetiology of type II and III odontoid fractures. (Folia Morphol 2020; 79, 1: 141–147)

17

Features and clinical significance of the ossification centres in the odontoid process based on micro-computed tomography

41%

Wang W. , Wang X. , Ren X. , Li Z. , Su B. , Xu Y. , Xu X. , Lv D. , Liu W. , Zhang S. , Chen L. , Li X.

Folia Morphologica

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2020

|

tom 79

|

nr 4

18

Phytotoxicity mechanisms of two coumarin allelochemicals from Stellera chamaejasme in lettuce seedlings

41%

Yan Z. , Wang D. , Cui H. , Zhang D. , Sun Y. , Jin H. , Li X. , Yang X. , Guo H. , He X. , Pan L. , Ren X. , Guo K. , Qin B.

Acta Physiologiae Plantarum

|

2016

|

tom 38

|

nr 10