نتایج جستجو برای: shaped joints made of beech and fir

تعداد نتایج: 24071877  

This study was carried out in managed and unmanaged Fagus orientalis L. (beech) stands in the Asalem beech forest in order to compare the composition and diversity of plant species. Three V-shaped catena landforms were selected for each stand. Then, large quadrats, 400 m2 area, with selective method and within each of them, small quadrats, 4 m2 area, were established along each catena and slope...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه علوم کشاورزی و منابع طبیعی گرگان - دانشکده منابع طبیعی گرگان 1391

چکیده: در این تحقیق تأثیر ملاس که یکی از محصولات جانبی صنایع قند می باشد به عنوان یک افزودنی مقاومت خشک جدید در بهبود پالایش پذیری و ویژگی های فیزیکی و مکانیکی مقوای کنگره ای کهنه (occ) مورد بررسی قرار گرفته شد. بدین منظور پنج سطح ملاس( 0،5، 10، 15 و 18%) و سه سطح درجه روانی(420،400و320 میلی لیتر)به عنوان فاکتورهای متغیر در نظر گرفته شد و برای هر تیمار کاغذهای دست ساز با مساحت 2cm200 و وزن پای...

Journal: :Drvna Industrija 2021

In this study, creep characteristics of single stapled furniture joints made Scotch pine, alder and beech wood under three different load levels were considered. Load determined as 30 %, 40 % 50 the maximum obtained a result static shear test before applied to joints. Laboratory results showed that highest deformation was observed in pine with lowest density, while density. addition, exposed at...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه پیام نور - دانشگاه پیام نور استان تهران - دانشکده علوم انسانی 1388

هدف تحقیق حاضر بررسی تاثیر نشانه های فرا گفتمان متنی بر فهم متون انگلیسی به وسیله ی زبان اموزان فارسی زبان است.این تحقیق علاوه بر این کوشیده است تا میزان اگاهی این زبان اموزان و نحوه ی تعامل انان را با متون خوانده شده در زبان انگلیسی به وسیله ی پرسش نامه ی تهیه شده بررسی کند.بر اساس محتوای یک متن انگلیسی یازده سوال درست /غلط طرح گردید و یک مرتبه با ان متن و یک مرتبه با نسخه ای که نشانه ها...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شیراز - دانشکده علوم 1390

any change in the refractive index of a laser active medium can lead to serious degradation of beam quality, laser beam modes, laser performance and variation in the intensity distribution. alteration in the refractive index of laser active medium is especially notable in high power lasers. it is clear that in the laser beam production, the pumping agent induces a great amount of heat which...

KH. Sagheb-Talebi M. Amiri R. Rahmani

Canopy gaps are one of the most important structural features of forest ecosystems, and studying of them can have useful results and implications for forest management. The aim of this study is investigation of characteristics and regeneration within canopy gaps in an intact beech stand in the Shastkalateh Experimental Forest of Hyrcanian region, north of Iran. All canopy gaps and related fores...

2010
Jing Wu Xiaojuan Xia Jean-Philippe Couderc

In drug-safety study, the measurements of QT intervals require to have a level of precision to detect small druginduced prolongation (~ 5 msec). This paper discusses a modified approach of ∏-shaped FIR Filter to optimize the quality of signal and improve the stability of QT/QTc interval measurements.The proposed filter is designed to have a time-dependent frequency characteristic based on pre-d...

Journal: :Sustainability 2023

This research was carried out in a selection stand of beech and fir, where logging performed with chainsaws different powers. Two 3.9 kW were used for work on one area, while the other applied tools combination smaller larger saw (2.5 kW). After logging, consumption energy products (fuel (gasoline motor oil mix ratio 50:1) chainsaw oil) measured each individual by method refueling. It found tha...

Journal: :Forest Ecology and Management 2022

• Species size distribution dynamics in mixed forests were explored using a matrix model. Warming modifies species of mountain spruce-fir-beech forests. positively effects stand basal area fir but negatively beech. Increasing temperature favors the size-dominance over spruce and Size-dominant identity influences Forest composed Picea abies L. , Abies alba Mill. Fagus sylvatica cover large Europ...

Journal: :Remote Sensing of Environment 2022

Remote sensing can be used to collect information related forest management. Previous studies demonstrated the potential of using multispectral satellite imagery for classifying tree species. However, methods that map species in mixed stands on a large scale are lacking. We propose an innovative method mapping proportions Sentinel-2 imagery. A convolutional neural network was quantify per-pixel...

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