scholarly journals Application of an Adaptive Forest Management Simulation Model Based on Zoning in a Man-Made Forest

Forests ◽  
2019 ◽  
Vol 10 (6) ◽  
pp. 482 ◽  
Author(s):  
Katsuaki Sugiura ◽  
Waka Sonohara
Keyword(s):  
Field Survey ◽  
Assessment Method ◽  
Actual State ◽  
Forest Stands ◽  
Management Options ◽  
Simple Simulation ◽  
Simulation Based ◽  
Kanagawa Prefecture

In this study, shifts from the current forest physiognomy to a target forest physiognomy were modeled by applying the concept of zoning simulation. The objective was to present the process of generating management options for man-made forests in Kanagawa Prefecture, Japan. The assessment method was a wide-ranging and long-term simple simulation based on several indicators, such as geographical distribution and tree species, and adapted the concept of changes in forest physiognomy. A headwater forest in Kanagawa Prefecture, which covers an area of about 3784 ha and consists of 4445 forest stands, was investigated. Four plans were established based on the present state of the forest stands. The results indicated that factors for expressing forest physiognomy and their expression methods should be determined, and physiognomy models should be constructed to establish the actual state of the forests in each region. With this simulation, it is possible to forecast long-term changes at forest stand and basin levels for each scenario. However, only data from forestry register were used in this study, and it is expected that different results would be obtained by conducting a determination of stand position in the forest physiognomy together with a field survey.

scholarly journals Tree shape and form in ancient coppice woodlands

2017 ◽  
Vol 10 (2) ◽  
pp. 49-62 ◽  
Author(s):  
Petr Maděra ◽  
Tomáš Slach ◽  
Luboš Úradníček ◽  
Jan Lacina ◽  
Linda Černušáková ◽  
...  
Keyword(s):  
Tree Species ◽  
Field Survey ◽  
Scientific Literature ◽  
Forest Stands ◽  
Tree Shape ◽  
Lack Of Information ◽  
Basic Features

Abstract Ancient coppice woodlands are coppice-originated forest stands with a long-term continual development, and with the preserved typical natural and historic elements of old sprout forests. Prominent natural elements in the ancient coppice woodlands are namely old coppice stools. There is, in scientific literature, lack of information about features of ancient coppice stools. Therefore, our contribution aims to describe shape and form of ancient coppice stools, including the most important microhabitat of coppice woodlands – dendrothelms. Based on field survey of 20 localities of important coppice woodlands we recorded 135 ancient coppice stools of 13 tree species and a total of 80 dendrothelms in 9 tree species. Basic features of ancient coppice stools and dendrothlems were measured and evaluated.

SPATIAL-TEMPORAL VIDEO QUALITY ASSESSMENT BASED ON TWO-LEVEL TEMPORAL POOLING

2011 ◽  
Vol 11 (02) ◽  
pp. 235-249 ◽  
Author(s):  
FUZHENG YANG ◽  
SHUAI WAN
Keyword(s):  
Quality Assessment ◽  
Video Sequence ◽  
Video Quality ◽  
Assessment Method ◽  
Video Quality Assessment ◽  
Short Term ◽  
Quality Assessment Method ◽  
The Impact

In this paper, a video quality assessment method based on two-level temporal pooling is proposed. By dividing a video sequence into groups of frames (GOFs) with variable lengths, a short-term temporal pooling is performed first at the eye fixation level to obtain the GOF quality. The determination of the GOF size is based on empirical observations from subjective tests that evaluate the duration of successive frames based on which steady quality judgment can be made by the human visual system. The video quality is further obtained by a second level of long-term temporal pooling using the GOF quality. The impact of strong impairment in part of the video on the cognitive system is incorporated in the proposed method for video quality assessment. Extensive experimental results have demonstrated the effectiveness of the proposed method for spatial-temporal distortion evaluation considering both regular and irregular frame loss.

Preparation And elemental analysis of ancient fibers

1987 ◽  
Vol 45 ◽  
pp. 410-411
Author(s):  
Allen Angel ◽  
Kathryn A. Jakes
Keyword(s):  
Cross Sections ◽  
Physical Structure ◽  
Energy Dispersive ◽  
Archaeological Sites ◽  
X Ray ◽  
Long Term Storage ◽  
Backscattered Electron ◽  
Electron Imaging

Fabrics recovered from archaeological sites often are so badly degraded that fiber identification based on physical morphology is difficult. Although diagenetic changes may be viewed as destructive to factors necessary for the discernment of fiber information, changes occurring during any stage of a fiber's lifetime leave a record within the fiber's chemical and physical structure. These alterations may offer valuable clues to understanding the conditions of the fiber's growth, fiber preparation and fabric processing technology and conditions of burial or long term storage (1).Energy dispersive spectrometry has been reported to be suitable for determination of mordant treatment on historic fibers (2,3) and has been used to characterize metal wrapping of combination yarns (4,5). In this study, a technique is developed which provides fractured cross sections of fibers for x-ray analysis and elemental mapping. In addition, backscattered electron imaging (BSI) and energy dispersive x-ray microanalysis (EDS) are utilized to correlate elements to their distribution in fibers.

Improvement Of Curvilinear Diagrams Of Concrete Deformation

2019 ◽  
pp. 99-104
Keyword(s):  
Reinforced Concrete ◽  
Peak Load ◽  
Experimental Studies ◽  
Concrete Structures ◽  
Deformation Model ◽  
Reinforced Concrete Structures ◽  
Significant Difference ◽  
Deformation Diagrams

Problems when calculating reinforced concrete structures based on the concrete deformation under compression diagram, which is presented both in Russian and foreign regulatory documents on the design of concrete and reinforced concrete structures are considered. The correctness of their compliance for all classes of concrete remains very approximate, especially a significant difference occurs when using Euronorm due to the different shape and sizes of the samples. At present, there are no methodical recommendations for determining the ultimate relative deformations of concrete under axial compression and the construction of curvilinear deformation diagrams, which leads to limited experimental data and, as a result, does not make it possible to enter more detailed ultimate strain values into domestic standards. The results of experimental studies to determine the ultimate relative deformations of concrete under compression for different classes of concrete, which allowed to make analytical dependences for the evaluation of the ultimate relative deformations and description of curvilinear deformation diagrams, are presented. The article discusses various options for using the deformation model to assess the stress-strain state of the structure, it is concluded that it is necessary to use not only the finite values of the ultimate deformations, but also their intermediate values. This requires reliable diagrams "s–e” for all classes of concrete. The difficulties of measuring deformations in concrete subjected to peak load, corresponding to the prismatic strength, as well as main cracks that appeared under conditions of long-term step loading are highlighted. Variants of more accurate measurements are proposed. Development and implementation of the new standard GOST "Concretes. Methods for determination of complete diagrams" on the basis of the developed method for obtaining complete diagrams of concrete deformation under compression for the evaluation of ultimate deformability of concrete under compression are necessary.

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