Wyniki wyszukiwania - Biblioteka Nauki

1

Effect of Air Gap Entrapped in Firefighter Protective Clothing on Thermal Resistance and Evaporative Resistance

100%

He H. , Yu Z.

Autex Research Journal

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2018

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tom Vol. 18, no. 1

28--34

EN

Heat and water vapor transfer behavior of thermal protective clothing is greatly influenced by the air gap entrapped in multilayer fabric system. In this study, a sweating hot plate method was used to investigate the effect of air gap position and size on thermal resistance and evaporative resistance of firefighter clothing under a range of ambient temperature and humidity. Results indicated that the presence of air gap in multilayer fabric system decreased heat and water vapor transfer abilities under normal wear. Moreover, the air gap position slightly influenced the thermal and evaporative performances of the firefighter clothing. In this study, the multilayer fabric system obtained the highest thermal resistance, when the air space was located at position B. Furthermore, the effect of ambient temperature on heat and water vapor transfer properties of the multilayer fabric system was also investigated in the presence of a specific air gap. It was indicated that ambient temperature did not influence the evaporative resistance of thermal protective clothing. A thermographic image was used to test the surface temperature of multilayer fabric system when an air gap was incorporated. These results suggested that a certain air gap entrapped in thermal protective clothing system could affect wear comfort.

2

Evidence for a role of ferritin heavy chain in mediating reproductive processes of geese

80%

Kang B. , Jiang D. , Ma R. , He H.

Reproductive Biology

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2015

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tom 15

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nr 4

3

Changes in OsXTH gene expression, ABA content, and peduncle elongation in rice subjected to drought at the reproductive stage

80%

He H. , Serraj R. , Yang Q.

Acta Physiologiae Plantarum

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2009

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tom 31

|

nr 4

EN

Drought stress causes yield loss in rice by inhibiting panicle exsertion which is driven by peduncle elongation near flowering. To elucidate the mechanism of peduncle elongation, we examined the drought sensitivity of corresponding genes encoding xyloglucan endotransglycosylase/hydrolase (XTH), a cell wall-loosening enzyme essential for cell elongation in the peduncle elongation zone at heading stage. When drought was imposed 6 days before heading, peduncle elongation rate (PER) was inhibited significantly at heading and 1 day after heading. Eleven OsXTH genes were isolated and their expression in rice peduncle determined. The expression of 11 OsXTH genes showed different patterns of response to drought stress. OsXTH3 was completely suppressed by drought. Transcript levels for OsXTH19, -20, -24, -27 and -28 genes were markedly down-regulated at a series of drought stresses. By contrast, OsXTH5 was up-regulated. Also, the behavior of leaf gas exchange and peduncle abscisic acid (ABA) level was determined under drought conditions. The results indicated that stomatal conductance was 83% lower than that in control plants and peduncle ABA increased ninefold with drought stress. Peduncle ABA content correlated highly with leaf stomatal conductance and PER (r = 0.85** and 0.88**). The expression in OsXTH5, -19, -20, -24 and -28, corresponded to changes in PER and ABA. We conclude that ABA could be involved in inducing the retardation of PER and changes of expression of OsXTH genes. OsXTH5, -19, -20, -24 and -28 genes may play a role in rice peduncle elongation. In addition, interactions among genes may affect PER under drought.

4

Neural network based identification of hysteresis in human meridian systems

80%

Tan Y. , Dong R. , Chen H. , He H.

International Journal of Applied Mathematics and Computer Science

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2012

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tom Vol. 22, no. 3

685-694

EN

Developing a model based digital human meridian system is one of the interesting ways of understanding and improving acupuncture treatment, safety analysis for acupuncture operation, doctor training, or treatment scheme evaluation. In accomplishing this task, how to construct a proper model to describe the behavior of human meridian systems is one of the very important issues. From experiments, it has been found that the hysteresis phenomenon occurs in the relations between stimulation input and the corresponding response of meridian systems. Therefore, the modeling of hysteresis in a human meridian system is an unavoidable task for the construction of model based digital human meridian systems. As hysteresis is a nonsmooth, nonlinear and dynamic system with a multi-valued mapping, the conventional identification method is difficult to be employed to model its behavior directly. In this paper, a neural network based identification method of hysteresis occurring in human meridian systems is presented. In this modeling scheme, an expanded input space is constructed to transform the multi-valued mapping of hysteresis into a one-to-one mapping. For this purpose, a modified hysteretic operator is proposed to handle the extremum-missing problem. Then, based on the constructed expanded input space with the modified hysteretic operator, the so-called Extreme Learning Machine (ELM) neural network is utilized to model hysteresis inherent in human meridian systems. As hysteresis in meridian system is a dynamic system, a dynamic ELM neural network is developed. In the proposed dynamic ELMneural network, the output state of each hidden neuron is fed back to its own input to describe the dynamic behavior of hysteresis. The training of the recurrent ELM neural network is based on the least-squares algorithm with QR decomposition.

5

Astragaloside IV exerts anti-tumor effect on murine colorectal cancer by re-educating tumor-associated macrophage

80%

Liu F. , Ran F. , He H. , Chen L.

|

2020

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tom 68

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nr 6

6

Patchy nature of cement and concrete revealed by physical discrete element simulation approach

80%

Stroeven P. , He H. , Guo Z. , Stroeven M.

Inżynieria Materiałowa

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2008

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tom Vol. 29, nr 4

408-412

EN

Microscopy observations have revealed the physical existence of a so-called patch microstructure in concrete. This paper presents some evidence that patchy nature is also exist in meso-level, such as distribution of aggregate grain and fibers in concrete. Systematic experimental research into dispersion characteristics of "particles" would be time-consuming and thus expensive. Physical discrete element computer simulation (DECS) by concurrent algorithm-based SPACE system is an economic and potentially reliable alternative. Compared with experimental results, it demonstrates the reliability of the applied DECS approach for predicting dispersion characteristics exploration of cementitious materials on different levels of the microstructure. Patchy nature has been revealed by this DECS approach in meso-level and micro-level.

PL

Obserwacje mikroskopowe wykazały istnienie tak zwanej niejednorodności mikrostrukturalnej betonu. Niniejsza praca przedstawia dowody przemawiające za występowaniem tego rodzaju niejednorodności także na poziomie mesostruktury, jak to ma miejsce na przykład w przypadku rozkładu ziaren kruszywa i rozproszonych włókien w betonie. Systematyczne badania naukowe nad poznaniem charakterystyk rozproszenia "ziaren" byłoby bardzo czasochłonne, a co za tym idzie kosztowne. Symulacja komputerowa za pomocą metody elementów dyskretnych (DECS) rzeczywistej budowy struktury betonu z wykorzystaniem programu SPACE, jest ekonomiczną i potencjalnie wiarygodną alternatywą. Porównanie z wynikami badań eksperymentalnych wykazuje wiarygodność zastosowanej metody (DECS) do przewidywania charakterystyk rozmieszczenia składników w materiałach cementowych, badanych na różnych poziomach obserwacji mikrostruktury. Niejednorodność budowy została wykazana za pomocą metody DECS zarówno na poziomie meso, jak i mikrostruktury.

7

Discrete element approach to packing of arbitrary-shaped particles in concrete

80%

He H. , Guo Z. , Stroeven P. , Stroeven M.

Inżynieria Materiałowa

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2008

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tom Vol. 29, nr 4

403-407

EN

The shapes of real particles using in concrete, from coarse aggregate to mineral admixture, are irregular. The influence of particle shape on behavior of packing is enormous, so on the properties of fresh concrete and matured concrete. Definition of actual grain shape as well as simulation in a discrete element simulation (DES) approach is complicated, however. Spherical grain shape is therefore generally adopted in conventional simulation systems, despite imposing serious limitations. In this paper, a simulation strategy is presented for representation of arbitrary-shaped aggregate grains applied in concrete technology. This simulation approach is also incorporated in a concurrent algorithm-based DES system with the acronym HADES. After assessment of properties pertaining to arbitrary shaped particles, such as mass, centre of mass, and moment of inertia, an example of random mono-sized packing with deferent shapes by DES approach is also revealed. The influence of shape on mono-sized packing behavior is also briefly discussed in this paper.

PL

Rzeczywiste kształty ziaren, wykorzystywanych w produkcji betonu, poczynając od żwiru do mineralnych domieszek, są nieregularne. Ponieważ wpływ kształtu ziaren na sposób ich upakowania jest bardzo istotny, ma on również ogromny wpływ zarówno na właściwości świeżej mieszanki betonowej, jak i betonu stwardniałego. Zdefiniowanie rzeczywistego kształtu ziarna, jak i jego zasymulowanie, w opisie dyskretnym (DES) jest skomplikowane. Z tego względu w tradycyjnych metodach symulacyjnych wykorzystywany jest kulisty kształt ziaren, pomimo iż wiąże się to z istotnymi ograniczeniami. W niniejszej pracy przedstawiono propozycję strategii symulacji dla ziaren kruszywa o dowolnym kształcie. Ten sposób symulacji jest także wykorzystywany w zbliżonym algorytmie, bazującym na metodzie DES, znanym pod nazwą HADES. Po określeniu właściwości charakteryzujących ziarna o przyjętym kształcie, takich jak na przykład masa, środek masy oraz moment bezwładności, przedstawiono przykład losowego upakowania za pomocą metody DES ziaren kruszywa, jednorodnych wymiarowo, ale o zróżnicowanym kształcie. W pracy omówiono pokrótce także wpływ kształtu na jednorodny wymiarowo sposób upakowania ziaren kruszywa w strukturze betonu.

8

Simultaneous removal of NH4+ and PO43- from simulated reclaimed waters by modified natural zeolite. Preparation, characterization and thermodynamics

80%

Alshameri A. , He H. , Dawood A. S. , Zhu J.

Environment Protection Engineering

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2017

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tom Vol. 43, nr 4

73--92

EN

Natural zeolite was modified by NaCl, AlCl3 and thermal treatment for the removal of NH4+ and PO43− ions. The characteristics of the modified zeolite (AlZ) and its mechanism for the NH4 + and PO43− removal were studied and compared. The results showed that the surface area and the Na+ and Al3+ content increased whereas the content of Ca2+, K+ and Mg2+ decreased after zeolite modification. On natural zeolite when activated with the 1 M NaCl and 10 cm3 /g of pillaring dosage, high adsorption efficiencies for the NH4 + (97.80%) PO43− (98.60%) were obtained. The results of various analyses indicated that the Na+ exchange is the main mechanism for NH4 + removal whereas the adsorption mechanism for PO43− followed the complexation with Al–OH groups present in the AlZ. In addition, the kinetics study showed that the adsorption of NH4+ and PO43− followed pseudo-second order model while the adsorption isotherm of NH4 + and PO43− is consistent with the Langmuir isotherm model. Moreover, the Gibbs free energy change for the simultaneous removal of the ions indicates that NH4 + is adsorbed faster compared to PO43−. The simultaneous removal of NH4 + and PO43− by AlZ adsorbent is cost effective in water treatment at low ion concentrations.

9

Differential responses of two rice varieties to perchlorate stress

71%

Chen G. , He H. , Gao H. , Li H. , Zhang Z.

Polish Journal of Environmental Studies

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2015

|

tom 24

|

nr 1

EN

Two rice varieties, one perchlorate-tolerant (Gannuoxiang, GN) and the other perchlorate-sensitive (IR65598-112-2, IR), were exposed to 20, 200, and 400 mg/kg soil perchlorate to investigate their physiological responses and perchlorate accumulation. It was found that perchlorate decreased leaf chlorophyll content in both rice varieties. The activities of superoxide dismutase (SOD) and catalase (CAT) decreased while peroxidase (POD) increased in both rice varieties under perchlorate stress at tillering stage. Rice variety IR showed earlier physiological response and was more affected by perchlorate than GN. Perchlorate induced physiological response in different ways depending on perchlorate contamination level, rice variety, and growing stage. Perchlorate concentration in leaves was significantly higher than that in roots, stems and seeds. Perchlorate accumulation in IR leaves was higher than GN, but GN stored more perchlorate in its edible portion at low perchlorate level. These results indicated that high sensitivity of the rice variety IR to perchlorate stress might be due to antioxidant enzymes in perchlorate-detoxification and its higher perchlorate accumulation in leaves.

10

Nitrogen and phosphate recovery from source-separated urine by dosing with magnesite and zeolite

71%

Xu S. , Luo L. , He H. , Liu H. , Cui L.

Polish Journal of Environmental Studies

|

2015

|

tom 24

|

nr 5

11

Effects of hybrid giant napier biochar on cadmium migration in a cabbage-soil system contaminated with cadmium and butachlor

71%

He H. , Pan J. , Yu P. , Chen G. , Li H.

|

tom 26

|

nr 2

EN

We investigated the effects of high-productivity plant hybrid giant Napier (HGN)-derived biochars prepared at different pyrolysis temperatures on Cd migration in a soil-cabbage system contaminated with Cd and butachlor. The results showed that with the enhancement amount of biochar applied, soil pH and electrical conductivity (EC) increased, whereas the available Cd content dropped significantly (P<0.05). The maximum decreasing value (66.08%) of the available Cd content was observed, while with 5% biochar prepared at 400ºC. Further application of this biochar caused a significant biomass increase and a Cd content decrease of cabbage (P<0.05). Notably, the cabbage biomass even increased to 573.58%. The application inhibited Cd migrations from the soil to the underground part and, successively, the overground part of the cabbage, leading to reduced bioaccumulation of Cd. With 5% biochar prepared at 400ºC, the maximum decrease of the Cd content reached up to 90% in the aboveground part and 70% in the underground part of cabbage, respectively. Hence, the investigation demonstrates that high-productivity HGN-derived biochar can be a good candidate for immobilizing Cd and reducing its bioaccumulation.

12

Analysis of main metabolisms during nitrogen deficiency and compensation in rice

61%

Shen T. , Xiong Q. , Zhong L. , Shi X. , Cao C. , He H. , Chen X.

Acta Physiologiae Plantarum

|

2019

|

tom 41

|

nr 05

EN

Compensatory effect is observed during the process of gradual adaptation of plants to abnormal environmental conditions; nitrogen fertilizer compensation has been extensively studied in rice production in recent years. However, metabolite production of the phenomenon has not been studied clearly. In this study, we used super hybrid early rice as the material and planted it in a barrel. Experiments were performed under two conditions of treatment, namely, CK (normal quantities of nitrogen fertilizer distribution at different growth stages) and T1 (nitrogen deficiency at tillering stage and compensatory application at young panicle differentiation stage). Liquid chromatography–mass spectrometry (LC–MS) was used to analyze metabolomics of rice leaves under conditions of nitrogen deficiency and compensation after the same period of CK treatment. Results showed that there was a significant difference between T1 and CK metabolites. The levels of stress-resistant substances and amino acid substitution product nitrogen deficiency increased under T1 treatment compared to CK, and the metabolites were consumed as the energy source. However, after compensation, the levels of the stress response products returned to normal, lipids were synthesized in large quantities, and fatty acid accumulation had increased.

13

Effects of grazing exclusion on soil properties in Maqin alpine meadow, Tibetan Plateau, China

61%

Li H. , Zhang F. , Mao S. , Zhu J. , Yang Y. , He H.

Polish Journal of Environmental Studies

|

2016

|

tom 25

|

nr 4

EN

Grazing exclusion with fencing has been widely implemented to rehabilitate degraded grasslands in China. However, the response of grassland ecosystems has remained controversial among sites and vegetation types. In this study, characteristics of vegetation and soil properties under degradation gradients (light and middle) and grazing exclusion were examined in the Maqin alpine meadow in August 2013. The results showed that grazing exclusion resulted in a significant recovery in vegetation with higher above- and below-ground biomasses, which reached 459.29 g·m⁻² and 5,657.93 g·m-2 in comparison with 132.53 g·m⁻² and 1,494.37 g·m⁻² in middle degraded plots, respectively. Soil bulk density in grazing exclusion decreased especially obviously in the 0-10 cm layer. Soil capillary and saturated water in grazing exclusion increased to 1,075.2 g·kg⁻¹ and 1,072.4 g·kg⁻¹, respectively, in the 0-10 cm layer. They also increased a little in the 10-20 cm layer. Grazing exclusion had significant positive effects on soil organic carbon and total nitrogen content, especially in the 0-10 cm layer. The results above indicated that grazing exclusion was an effective restoration approach to rehabilitate degraded alpine meadow in Maqin.

14

Molecular characterization of Entamoeba spp. in wild Taihangshan macaques (Macaca mulatta tcheliensis) in China

61%

Zhang Q. , Liu K. , Wang C. , Luo J. , Lu J. , He H.

Acta Parasitologica

|

2019

|

tom 64

|

nr 2

15

Dynamic characteristics of sugar accumulation and related enzyme activities in sweet and non-sweet watermelon fruits

61%

Liu J. , Guo S. , He H. , Zhang H. , Gong G. , Ren Y. , Xu Y.

Acta Physiologiae Plantarum

|

2013

|

tom 35

|

nr 11

EN

Sugar content largely determines watermelon fruit quality. We compared changes in sugar accumulation and activities of carbohydrate enzymes in the flesh (central portion) and mesocarp of elite sweet watermelon line 97103 (Citrullus lanatus subsp. vulgaris) and exotic nonsweet line PI296341-FR (C. lanatus subsp. lanatus) to elucidate the physiological and biochemical mechanisms of sugar accumulation in watermelon fruit. The major translocated sugars, raffinose and stachyose, were more unloaded into sweet watermelon fruit than non-sweet fruit. During the fruit development, acid a-galactosidase activity was much higher in flesh of 97103 than in mesocarp of 97103, in flesh and mesocarp of PI296341-FR fruit. Insoluble acid invertase activity was higher in 97103 flesh than in 97103 mesocarp, PI296341-FR flesh or mesocarp from 18 days after pollination (DAP) to 34 DAP. Changes in soluble acid invertase activity in 97103 flesh were similar to those in PI296341-FR flesh and mesocarp from 18 DAP to full ripening. Sucrose synthase and sucrose phosphate synthase activities in 97103 flesh were significantly higher than those in 97103 mesocarp and PI296341- FR fruits from 18 to 34 DAP. Only insoluble acid invertase and sucrose phosphate synthase activities were significantly positively correlated with sucrose content in 97103 flesh. Therefore, phloem loading, distribution and metabolism of major translocated sugars, which are controlled by key sugar metabolism enzymes, determine fruit sugar accumulation in sweet and non-sweet watermelon and reflect the distribution diversity of translocated sugars between subspecies.

16

Effects of heavy metals (Cd, Pb, Cu, Zn, and Ni) on Ipomoea aquatica Forsk. Growth in soil containing metal-biochar application

61%

Yu B. , Li D. , Zhang R. , He H. , Li H. , Chen G.

|

nr 4

17

Reducing the salinity impact on soilless culture of tomatoes using supplemental Ca and foliar micronutrients

61%

Saleh S. , Liu G. , Liu M. , Liu W. , Gruda N. , He H.

|

2019

|

tom 18

|

nr 3

EN

Salt stress is known as one of the most severe abiotic factors limiting the plant production all over the world. In this study, three additives: (i) supplemental Ca (5 mmol L–1) to nutrient solution, (ii) foliar application of micronutrients (Fe, Mn and Zn at 60, 160 and 110 mg L–1, respectively), and (iii) combination of both of them were evaluated aiming to reduce the negative impact of salt stress on tomato plants cultivated in a soilless culture and improve the internal quality of fruits. The obtained results show that salinity reduced vegetative growth and physiological parameters, fruit yield and its components, and even more lowered fruit market classification of tomatoes. Salinity treatment reduced most of essential macro- and micronutrients in tomato fruit, whilst Na content was increased. Tomato productivity and fruit quality were ameliorated under saline conditions by increasing Ca into nutrient solution and applying a foliar application of micronutrients. A combination of both additives ranked the first to alleviate the adverse effects of salinity on tomatoes, followed by solo supplemental Ca into saline nutrient solution. On the other hand, the internal fruit quality of antioxidant compounds, such as vitamin C, lycopene, α-carotene, β-carotene and lutein as well as acidity, total soluble solid and dry matter percent, were increased under saline conditions.

18

Non-invasive brain stimulation in vision impairment after stroke: the REVIS network

61%

Gall C. , Rossini P. M. , Tatlisumak T. , Waleszczyk W. J. , Speck O. , He H. , Sabel B. A.

|

tom 73

|

nr Suppl.1

EN

Non-invasive brain stimulation is a promising tool in treatment of visual impairment. The aim of the ‘Restoration of Vision after Stroke’ (REVIS) network is to determine if non-invasive current stimulation may also have a positive impact on vision restoration in patients with post-chiasmatic visual pathway lesions. In particular, the potential of non-invasive current stimulation in ameliorating vision impairment following stroke is the key issue addressed by the REVIS study group. Within the REVIS network a number of small sample, randomized, controlled, clinical studies including patients with post-chiasmatic lesions due to monohemispheric, ischemic or hemorrhagic stroke were initiated by clinical partners from Germany, Italy and Finland. The network also includes a basic neuroscience project that studies neuronal network reorganization in the cat visual system after stroke (Poland). Beyond the European network, a collaboration with the Institute of Automation at the Chinese Academy of Science was established. This contribution presents the overall aims of the network activity, the rational of the clinical endpoint selection and preliminary findings.

19

Leaching behavior of heavy metals in coal gasification residuals

61%

Liu J. , He H. , Chen Y. , Sun X. , Zheng J. , Yang S. , Jia J.

|

tom 26

|

nr 5

EN

The system of dynamic leaching was designed for samples of a coal gasification residual from a coalto-methanol plant in northwestern China in order to investigate the leaching behavior of four potentially hazardous elements – Hg, Cr, As, and Pb – in the coal gasification residual and investigate the impacts of the leaching time, size of the samples, and pH of the leaching solution on the leaching behavior of elements. The concentrations of elements in the leachate samples were all determined by inductively coupled plasma-mass atomic spectrometry (ICP-MS). The results showed that the leaching time, size of the samples, and pH of the leaching solution played an important role in affecting the leaching behavior of the selected elements from the coal residual samples. All trends were in decreasing order of significance as the leaching time went on and most leached concentrations reached the maximum at the initial stage of leaching experiments (from hours 0 to 4) accounting for 94.44%. The 80-mesh sample had the different leaching curve from the 10-mesh and 40-mesh samples for the same element because different forms of the heavy metals existed on the different-size samples.

20

Sharp transition of laser-induced periodic ripple structures

61%

Yang H. , He H. , Zhou L. , Qian J. , Hao J. , Zhu H.

Optica Applicata

|

2012

|

tom Vol. 42, nr 4

795--803

EN

Laser-induced periodic surface structures (LIPSS) (ripple) with different spatial frequencies have been observed after irradiation of stainless steel surfaces by femtosecond laser pulses in the air. Low spatial frequency LIPSS (LSFL) with the period (about 830 nm) close to the laser wavelength and high spatial frequency LIPSS (HSFL) with half wavelength (about 410 nm) were dependent on the scanning speed of laser focus. The sharp transition from the single LSFL to double HSFL structures occurs at 5 mm/s. This abrupt transition of dividing one ripple into two equals was proved.