scholarly journals Variation in Moisture Content of Sugi Boxed Heart Timber in Miyazaki Prefecture during Kiln Drying under High Temperature and Low Humidity: II. Distribution and change of moisture content

2005 ◽  
Vol 51 (4) ◽  
pp. 227-233
Author(s):  
Hisato ODA ◽  
Yoshifumi EBIHARA ◽  
Tadayoshi SAKODA ◽  
Noboru FUJIMOTO ◽  
Yasuhide MURASE
Keyword(s):  
High Temperature ◽  
Moisture Content ◽  
Kiln Drying ◽  
Low Humidity

Wood-Based Panels’ Properties when Subject to Temperature and Humidity Variation

2013 ◽  
Vol 787 ◽  
pp. 106-110
Author(s):  
Hai Xia Yu ◽  
Man Ping Xu ◽  
Chong Rong Fang ◽  
Fei Yan Guo
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Moisture Content ◽  
Internal Bond ◽  
Modulus Of Rupture ◽  
High Humidity ◽  
Thickness Swelling ◽  
Temperature And Humidity ◽  
Low Humidity ◽  
European Standards

In order to reveal impact of environment humidity and temperature on properties of indoor decorated materials, the paper tested physical and mechanical prosperities of 5 kinds of wood-based panels according to European standards after equilibrium treatments in 3 types of atmosphere. The results showed that the tested materials were very hydrophilic and their strength were closely related to moisture content. Internal bond, modulus of rupture, 24h-thickness swelling and surface soundness of wood-based panels decreased at high temperature and high humidity atmosphere and increased in low temperature and low humidity surroundings, and the decrement are greater than the increment. In contrast, density almost kept the same value during these treatments.

Industrial Kiln Drying and its Effect on Microstructure, Impregnation and Properties of Scots Pine Timber Impregnated for Above Ground Use. Part 1. Effects of Initial, Final Dryings and Preservative on Impregnation and Timber Quality

Holzforschung ◽  
2002 ◽  
Vol 56 (4) ◽  
pp. 428-433 ◽  
Author(s):  
N. Terziev
Keyword(s):  
High Temperature ◽  
Moisture Content ◽  
Scots Pine ◽  
Mixed Model ◽  
Strong Relationship ◽  
Final Moisture Content ◽  
Sapwood Area ◽  
Timber Quality ◽  
Kiln Drying ◽  
High Temperature Drying

Summary Scots pine (Pinus sylvestris L.) planks were dried in industrial progressive, conventional batch and high temperature kilns. The quality of drying was assessed by measuring the final moisture content and its gradient, deformations, checks and internal stress of planks. The timber was rearranged in three charges and impregnated in an industrial autoclave with copper-based preservatives for above ground use (class AB):Kemwood ACQ 1900, Tanalith E and Wolmanit CX-8. The moisture content was determined after impregnation and the planks were divided into two charges; the first was dried in an industrial conventional batch kiln while the second was air dried. Assessment of the final product quality after kiln and air drying was carried out as after the initial drying. The penetration of preservatives was measured as well. The data were analysed by a statistical mixed model to ascertain the effects of drying and preservatives on the impregnation and timber quality. A strong relationship was found between the initial drying of Scots pine timber and its quality after impregnation and drying. The conventional batch and high temperature kiln drying ensured similar drying quality regarding the final moisture content and gradient, bow, twist and checks, but the high temperature drying provided significantly better (94.4%of the total sapwood area) penetration of the preservatives tested. It is suggested that changes in wood structure could be provoked during the high temperature drying, thus improving the subsequent impregnation and secondary drying. The progressive and conventional batch kiln drying led to similar penetration of the preservatives; the conventional batch kiln drying ensured significantly lower final moisture content, less twist and surface checks of the timber than the progressive kiln drying. Wolmanit CX-8 penetrated significantly better into the pine sapwood (96.3%) than Kemwood ACQ 1900 and Tanalith E (83.5 and 88.5%, respectively). The planks impregnated with Wolmanit CX-8 achieved the best quality regarding the final moisture content, its gradient and cup. The planks impregnated with Kemwood ACQ 1900 and Tanalith E showed similar quality regarding the penetration and some deformations after drying, but Kemwood ACQ 1900 impregnated planks had highest moisture content and gradient.

Study on the Enzyme Activity Change during the Aerobic Composting Process of Sewage Sludge

2014 ◽  
Vol 955-959 ◽  
pp. 706-710
Author(s):  
Jun Ling Niu ◽  
Jun Hui He
Keyword(s):  
Enzyme Activity ◽  
High Temperature ◽  
Sewage Sludge ◽  
Moisture Content ◽  
Cellulase Activity ◽  
Moisture Loss ◽  
Intensity Change ◽  
Composting Process ◽  
Activity Intensity ◽  
Sludge Disposal

Compost is widely used for treating urban garbage and sewage sludge. The enzyme activity is one of the important parameters of microbial quantity and its activity intensity change in the composting process, and all of the biochemical reactions during the composting process are carried out with the enzymes involving. The composting progress and the material change are directly reflected by the enzyme activity. In Zhengzhou Bagang sludge disposal plant, sludge was mixed with straw to compost together and with the technology of high temperature solid state aerobic slot for sludge treatment. This study was done to research the tendency of peroxide enzyme activity, cellulose enzyme activity, pH, conductivity, moisture content in the process of compost. The result showed that at the beginning of the compost, cellulase activity increased first and then decreased gradually and tended to be stable. The catalase activity was higher at the beginning of the compost and at the period of temperature raising it was stable basically, then decreases quickly and after that it maintain on the lower level. The moisture content declined gradually during the composting process, and in the period of high temperature there are more moisture loss. PH increased at first, and with the temperature raised to high the pH decreased gradually and tended to be stable. Conductivity increased first, then decreased gradually to steady.

DIEL PERIODICITY AND TRAP BIAS IN STICKY TRAP SAMPLING OF SHARPNOSED LEAFHOPPER1 POPULATIONS2,3

1985 ◽  
Vol 20 (2) ◽  
pp. 237-243 ◽  
Author(s):  
John R. Meyer ◽  
Sue Ann Colvin
Keyword(s):  
High Temperature ◽  
Host Plants ◽  
Soil Surface ◽  
Sticky Trap ◽  
Flight Activity ◽  
Diel Periodicity ◽  
Early Afternoon ◽  
Low Humidity ◽  
Trap Bias

Sharpnosed leafhoppers, Scaphytopius magdalensis (Provancher), exhibit a diel periodicity characterized by morning and evening peaks of flight activity. Adults are most commonly found on blueberry plants at night; they apparently seek shelter during the day and return to their host plants around dusk. Flight activity during midday and early afternoon is usually correlated with high temperature and low humidity. Most local flight activity occurs from 0 to 50 cm above the soil surface and is significantly affected by bush height.

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