This research aimed to evaluate the growth and productivity of planted Pinus pinea
in pure stands at "DAHR AL SORANI" forest site. The site is about 50 km north east of
Tartous city, which is located in Temperate-Humid Bioclimate Zone.
Results sho
wed that the stands were not equivalent in growth indicators; this was due
to many factors affecting growth like site characteristics and trees density…etc. In spite of
the mediocre values of form factor, the volume and mean of annual increment was not
influenced.
Results revealed that the mean values of tree density was 851 trees/ha and ranged
between 350 - 1975 trees/ha, woody volume was averaged at 116.337 m3/ha and
ranged between 51.6519 - 215.3635 m3/ha; annual increment had also an average of 4.4548
m3/ha/year and ranged between 1.9866 - 7.9764 m3/ha/year.
The study showed a high straightness of pine. Pinus pinea trees had very rarely
forked boles.
Palaeomagnetism and some magnetic and physical properties (magnetic
susceptibility, intensity of the Natural Remnant Magnetization (NRM), ac
current electrical conductivity and density) of 136 samples from 22 sites of the
Yemen Volcanic Group TKY
(Tertiary and (or) Cretaceous) from igneous rock
exposures along the road from Sana’a – west towards Al-Hudyadah were
studied. A single population consists of seven Virtual Geomagnetic Poles
(VGP), of the Upper Oligocene, was accepted and a mean at 182.81° E, 77.44° N
with α95= 12.5° was calculated. The different properties were measured in
order to use these properties as characteristic factors to discriminate the
neighboring igneous flows. The measurement of the in situ magnetic
susceptibility of 140 points, distributed on 7 sub-areas, in the region helped to
calculate the mean value of the magnetic susceptibility of each sub-area, which
might be used in any magnetic interpretation of aeromagnetic or magnetic
anomalies. Also, the density of 132 samples were measured and a mean value of
the density of each sub-area was calculated in order to be used in any future
interpretation of any gravity anomaly in the area.
Density
Basalt
الكثافة
المتأثرية المغنطيسية
المغنطيسية المتبقية الأولية
مجموعة صخور اليمن الاندفاعية
Magnetic susceptibility
Palaeomagnetism
بازلت
الناقلية الكهربائية (بالتيار المتناوب)
اغنمبريت
طف ملتحم
بورفيريت أساسي
أغلوميريت
NRM = Natural Remnant Magnetization
ac current electrical conductivity
(Virtual Geomagnetic Poles (VGPs
ignembrite
welded tuffs
basic porphyrites
المزيد..
Palaeomagnetism and some magnetic and physical properties (magnetic
susceptibility, intensity of remanent magnetisation, ac current electrical
conductivity and density) of many basaltic samples were studied.
Syria
سورية
Density
حُمّص
الكثافة
المتأثرية المغنطيسية
المغنطيسية المتبقية الأولية
Magnetic susceptibility
Magnetostratigraphy
Homs
ac current electrical conductivity
الناقلية الكهربائية بالتيار المتناوب
الستراتغرافيا المغنطيسية
زمن القطبية
كسوة
سويداء
NRM= Natural Remanent Magnetisation
polarity chron
Kisweh
Swedah
المزيد..
شملت هذه الدراسة حصر و تعريف 80 نوعاً و تحت نوع واحد من الأعشاب تنتمي لـ 64 جنساً موزعة على 28 فصيلة ضمن ثلاثة بساتين للحمضيات في منطقة اللاذقية على مدار أربعة فصول خلال الفترة الواقعة من أيلول 2014 حتى آب 2015. تم حساب كل من الكثافة و الكثافة النسبي
ة و التردد و التردد النسبي لكل نوع عشبي لمعرفة تركيب الغطاء العشبي و أهمية الأنواع المنتشرة. كانت نسبة الأنواع التابعة لأحاديات الفلقة 24.69%، أما التابعة لثنائيات الفلقة كانت نسبتها 75.31%، و شكلت الأنواع الحولية نسبة كبيرة بلغت 85.19% و المعمرة 13.58% و ثنائية الحول 1.23%. دلت النتائج أن أكثر أنواع الأعشاب الموجودة في بساتين الحمضيات تتبع الفصيلة الكلئية (Poaceae)، حيث تضمنت 17 نوعاً و تحت نوع واحد، و تلتها الفصيلة الفولية (Fabaceae (9 أنواع و الفصيلة النجمية (Asteraceae (8 أنواع و الفصيلة الحليبية (Euphorbiaceae (7 أنواع. وكان أكثر أنواع أحادية الفلقة كثافةً نوع السعد Cyperus rotundus L. بكثافة بلغت 20.2 نبات/م2 خلال فصل الصيف، أما أكثر أعشاب ثنائيات الفلقة كثافةً عشبة حشيشة الزئبق Mercurialis annua L. بكثافة59.27 نبات/م2 خلال فصل الخريف. و من أهم نتائج الدراسة أيضا إضافة 3 أنواع، و تحت نوع واحد من الفصيلة الكلئية (Poaceae) للفلورا السورية.
Palaeomagnetism and some magnetic and physical properties such as
magnetic susceptibility, intensity of remanent magnetisation, ac current
electrical conductivity and density for the number order (٣٩ - ٥٤) of samples
from ٩ sites of Upper Pliocene
basaltic rocks from the area west of
Homs were studied. The aim of the works to extend the previous studies (Abou-
Deeb, ١٩٩٧a, b) to other regions so that these properties might be used as
characteristic factors in discriminating the basaltic flows.
This paper presents a study to reduction of heavy crude oil viscosity by
heating, where we select the best of temperature for all types instead of
constant temperature, whatever composition and viscosity of crude oil.
This research has studied some of the physical properties for
Castanea sativa Mill. And Quercus cerris subsp. Pseudocerris, which
have small diameters resulting from the processes of breeding and
development and are related to the most important uses of modern
wood.