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  • Open Access

    ARTICLE

    Design of Greenhouse Temperature and Humidity Measuring System based on Zigbee Technology

    Xuejun Tian, Jianliang Li, Lihua Luo

    Computer Systems Science and Engineering, Vol.33, No.5, pp. 317-326, 2018, DOI:10.32604/csse.2018.33.317

    Abstract In this paper, the wireless network communication system based on ZigBee protocol is design using CC2530 chip as the processor together with front-end CC2530. In the system, the temperature and humidity information collected by DHTII temperature and humidity sensor is gathered and processed by CC2530 chip; the data of temperature and humidity sent back by the receiving nodes of main module will be sent to the upper compouter by serial assistant; then the upper computer recieves and displays the data so that users can check them conveniently. The application of the aforementioned ZigBee wireless communication More >

  • Open Access

    ARTICLE

    Numerical Study of the Distribution of Temperatures and Relative Humidity in a Ventilated Room Located in Warm Weather

    J. Serrano-Arellano1, J. M. Belman-Flores2,*, I. Hernández-Pérez3, K. M. Aguilar-Castro3, E. V. Macías-Melo3, F. Elizalde-Blancas2, J. M. Riesco-Ávila2, F. J. García-Rodríguez4

    CMES-Computer Modeling in Engineering & Sciences, Vol.123, No.2, pp. 571-602, 2020, DOI:10.32604/cmes.2020.08677

    Abstract In the present study, an analysis of the heat and mass transfer in a ventilated cavity in a warm climate zone was carried out to analyze, among others, the temperatures and percentage of relative humidity (RH). The governing equations of the mathematical model were solved through the finite volume method. We used the k-ε turbulence mode to find the results of the variables of interest in seven climate records on a given day. The velocity of the inlet flow of the air-H2O mixture was varied through the Reynolds number (Re) from 500 to 10000. The outdoor weather… More >

  • Open Access

    ARTICLE

    Pollen production in sunflower (Helianthus annuus L.) is affected by air temperature and relative humidity during early reproductive growth

    Astiz V1, LF Hernández2,3

    Phyton-International Journal of Experimental Botany, Vol.82, pp. 297-302, 2013, DOI:10.32604/phyton.2013.82.297

    Abstract During microsporogenesis, sunflower florets might be exposed to episodes of day- and night-time temperatures exceeding 30 and 20 °C, respectively, that can affect pollen availability and consequently plant’s yield. The relationship between air temperature and relative humidity during the meiotic phase of microsporogenesis, and the quantity and quality of pollen produced by the flowers, were studied in two sunflower hybrids during two years. The hybrids were grown on irrigated plots in Bahía Blanca (38° 45’ S; 62° 11’ W) in three planting dates (PD) at a density of 5.6 plants/m2. Flowers were consecutively taken as… More >

  • Open Access

    ABSTRACT

    Ultrasonic Fatigue Properties of Age-hardened Al Alloy in High Humidity

    Q. Chen, K. Kariya

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.16, No.1, pp. 3-4, 2011, DOI:10.3970/icces.2011.016.003

    Abstract Abstract Al alloys have been widely used as engineering materials in many machines and structures because of their excellent properties such as high specific strength, high resistance to corrosion and easy to recycle. Especially, high strength Al alloys are effective to reduce environment load through achieving low fuel consumption in automobile engines. On the other hand, high strength Al alloys have no definite fatigue limit and their fatigue strengths are very low in comparison with their high static strengths. It is important to know the fatigue strength of high strength Al alloys in the long… More >

  • Open Access

    ARTICLE

    Feasibility of Using Wood Chips to Regulate Relative Humidity Inside a Building: A Numerical Study

    Dimitri Bigot1,*, Cyril Ott1, Stéphane Guichard1, Bruno Malet-Damour1

    Journal of Renewable Materials, Vol.7, No.6, pp. 505-516, 2019, DOI:10.32604/jrm.2019.04019

    Abstract The use of bio-based materials in buildings has become more and more significant last years. In most of the cases, their health properties and natural provenance have made them a great solution to face global climate warming and the new policies to reduce building energy consumption. In many thermal problems, bio-based materials can allow to optimize the building thermal behavior according to its energy consumption and inside comfort conditions. So it is when they are used as an insulation material in the building. However, it is not the case in this paper. In fact, the… More >

  • Open Access

    ARTICLE

    Influence of Water and Humidity on Wood Modification with Lactic Acid

    Charlotte Grosse1,2,*, Marion Noël1, Marie-France Thévenon3, Lauri Rautkari4, Philippe Gérardin2

    Journal of Renewable Materials, Vol.6, No.3, pp. 259-269, 2018, DOI:10.7569/JRM.2017.634176

    Abstract Impregnation of dry wood with pure lactic acid oligomers (OLAs) followed by heat treatment confers promising properties to wood because of OLA's good diffusion, in-situ polymerization and persistence in cell walls. Treatment provides drastic reduction of the equilibrium moisture content, high dimensional stability and good durability. The presence of water during treatment has been evaluated. Curing of OLA impregnated dry wood in humid atmosphere leads to a strong and global degradation of the material. OLA treatment of wet wood only impacts the water leaching rate negatively. Treatment of dry wood with OLA diluted in water More >

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