Mechanical Abrasion and Intercrown Spacing
نویسنده
چکیده
The crowns of neighboring trees of similar height do not interdigitate but rather are generally separated by spaces called "crown shyness" gaps. In a black mangrove (Avicennia germinans) forest in Costa Rica, the width of crown shyness gaps was positively correlated with the distance pairs of trees or branches adjacent to the gap swayed in the wind (n = 22; p< .01). Abrasion of buds, leaves and branches due to trees knocking into one another seems to create and maintain the spaces around each tree crown.
منابع مشابه
Investigating the effect of nanocoating on friction loss and abrasion in the piston rings
The piston ring which prepares mechanical sealing of a combustion chamber, should have significant abrasion resistance and less friction loss, using appropriate ring coating. The coating widely used is CrN, because of its good abrasion resistance at room temperature. However, it suffers from some shortcomings, such as high abrasion rate at temperatures above 200°C and lack of self-lubricating p...
متن کاملThe effect of mechanical surface conditioning methods on the shear bond strength of repaired composites
The effect of mechanical surface conditioning methods on the shear bond strength of repaired composites Dr. P. Alizadeh Oskuee* - Dr. N. Mohammadi* - Dr. S. Savadi Oskuee* - Dr. A. Hoseini** *- Assistant Professor of Operative Dentistry Dept. - Faculty of Dentistry – Tabriz University of Medical Sciences. **- Dentist. Background and Aim: Considering the cost and quantity of tooth loss in the pr...
متن کاملResistance of a nonwoven geotextile against mechanical damage and abrasion
The installation procedures (which induce mechanical damage) and abrasion can cause unwanted changes on the properties of the geotextiles. In this work, a nonwoven polypropylene geotextile was subjected to three degradation tests: (1) mechanical damage, (2) abrasion and (3) mechanical damage followed by abrasion (successive exposure). The damage caused by the degradation tests was evaluated by ...
متن کاملEvaluation of Floorcovering Abrasion Resistance by Means of Image Processing Technique
An important factor in material quality is the time duration that materials are used (known as substance lifetime). Lifetime is a function of several factors, and among them wearing and abrasion resistances are more important than the other aspects. In addition, to the physical and mechanical properties, abrasion has a significant effect on the textiles appearance. This phenomenon considerably ...
متن کاملThe Effect of Pleural Abrasion on the Treatment of Primary Spontaneous Pneumothorax: A Systematic Review of Randomized Controlled Trials
BACKGROUND Pleural abrasion has been widely used to control the recurrence of primary spontaneous pneumothorax (PSP). However, controversy still exists regarding the advantages and disadvantages of pleural abrasion compared with other interventions in preventing the recurrence of PSP. METHODS The PubMed, Embase, and Cochrane Central Register of Controlled Trials databases were searched up to ...
متن کامل