scholarly journals Modelling of forest road sediment in the northern forest of Iran (Lomir Watershed)

2014 ◽  
Vol 60 (No. 3) ◽  
pp. 109-114 ◽  
Author(s):  
P. Dalir ◽  
R. Naghdi ◽  
V. Gholami
Keyword(s):  
Regression Analysis ◽  
Northern Iran ◽  
Forest Roads ◽  
Northern Forest ◽  
Forest Road ◽  
Sediment Volume ◽  
North Of Iran ◽  
Road Width ◽  
Slope Vegetation ◽  
Spss Software

Forest roads are the most important ways of access; nevertheless, they are the main source of sediment production. The delivered sediment by forest roads causes environmental problems and pollution of water resources. This study has been done to present a model for estimating the sediment yield of forest road using a multiple regression analysis on the Caspian southern coasts (north of Iran, Lomir watershed). For this purpose, 45 wood dams were created and their sediment volume (dependent variable) was measured. The following independent variables were estimated: road length, road width, road slope, vegetation cover, height of cut slope and road age. Then, a regression analysis was done using SPSS software to present a linear model. In the next step, the accuracy and capability of the presented model were considered and validated using the model for estimating the wood dam sediment. The results showed that road length and road width have significant effects in sediment generation. Also, the presented model can estimate the forest road sediment in northern Iran.  

scholarly journals The effects of Rubus hyrcanus L. and Philonotis marchica (Hedw.) Brid. on soil loss prevention from cutslopes of a forest road

2012 ◽  
Vol 58 (No. 8) ◽  
pp. 337-344 ◽  
Author(s):  
A. Parsakhoo ◽  
M. Lotfalian ◽  
A. Kavian ◽  
S.A. Hosseini ◽  
M. Demir
Keyword(s):  
Soil Loss ◽  
Sediment Concentration ◽  
Rainfall Simulation ◽  
Runoff Generation ◽  
Forest Roads ◽  
Northern Forest ◽  
Forest Road ◽  
Runoff And Soil Loss ◽  
The City ◽  
Runoff And Sedimentation

The effects of Rubus hyrcanus L. and Philonotis marchica (Hedw.) Bridon on runoff generation and soil loss from cutslopes of forest roads were investigated. The study was conducted at the northern forest of Iran, about 30 km south of the city of Sari. Runoff and sedimentation after each rainfall simulation and chemical and physical soil properties were measured in 14 plots with an area of 0.48 m<sup>2</sup>. The obtained results indicate that the vegetation dominated by Philonotis marchica exhibited the higher runoff coefficient and soil loss, with averages of 27.25% and 92.40&nbsp;g&middot;m<sup>&ndash;2</sup>&middot;h<sup>&ndash;1</sup>(gram per square meter per hour), respectively, in comparison to Rubus hyrcanus. For Philonotis marchica (Hedw.) Brid. the sediment concentration increased quickly at the beginning of rainfall simulations and after 10&ndash;12 min there was a fast decrease in sediment concentration. The peak of sediment concentration was for the Rubus hyrcanus L. in the 13<sup>th</sup>&ndash;15<sup>th</sup> min In conclusion, Rubus hyrcanus L. prevented or decreased the risk of runoff and soil loss from cutslopes of forest roads in our study area. &nbsp;

scholarly journals Assessment of forest road pavement materials one year after restoration (Case study: Asalem forest in northern Iran)

2019 ◽  
Vol 65 (No. 3) ◽  
pp. 113-119
Author(s):  
Mahsa Hashemi ◽  
Ramin Naghdi ◽  
Mehrdad Nikooy ◽  
Vahid Hemmati
Keyword(s):  
Road Construction ◽  
Control Treatment ◽  
Northern Iran ◽  
Forest Road ◽  
The Road ◽  
The North ◽  
Road Pavement ◽  
Significant Difference ◽  
North Of Iran ◽  
One Year

The main purpose of this study was evaluating indicators of forest road pavement degradation and their relation with different longitudinal slope classes after one year.  Therefore, 30 plots of 100 m<sup>2</sup> (10×10 m) area at a distance of 100 meters from each other were selected by a systematic method in the study forest road in the north of Iran. All effective factors on pavement degradation, like longitudinal and transverse slope, crown canopy on top of plots, azimuth and shape of road bed were measured. Additionally, to evaluate the mechanical characteristics of soil, 4 kg soil samples of pavement surface materials were taken from each mentioned plot. Regarding the results of average sifting through various sieves, we can state that in higher slope classes it is reduced by employing a bigger size of sieves. The percentage passing through sieve number 40 because of increasing slope in 4–7% slope classes was increased. There is a significant difference in the coefficient of uniformity between control treatment and classes 4–7% and above 7%. The treatments did not have an appropriate coefficient of curvature either. Totally, regarding negligible changes that were observed in class 4–7% in comparison with the other classes, we can figure out that this class is more suitable for the road construction.

The impact of forest roads on understory plant diversity in temperate hornbeam-beech forests of Northern Iran

2017 ◽  
Vol 189 (8) ◽  
Author(s):  
Azade Deljouei ◽  
Ehsan Abdi ◽  
Matteo Marcantonio ◽  
Baris Majnounian ◽  
Valerio Amici ◽  
...  
Keyword(s):  
Plant Diversity ◽  
Beech Forests ◽  
Northern Iran ◽  
Forest Roads ◽  
Understory Plant ◽  
The Impact

Ochratoxin A analysis in rice samples of different cities of Mazandaran (a province in Northern Iran)

2014 ◽  
Vol 44 (3) ◽  
pp. 223-229 ◽  
Author(s):  
Issa Gholampour Azizi ◽  
Hassan Ghadi ◽  
Samaneh Rouhi
Keyword(s):  
Rice Fields ◽  
Blue Color ◽  
Northern Iran ◽  
Content Type ◽  
Sample Extract ◽  
Rice Samples ◽  
Standard Solution ◽  
Spss Software ◽  
Contamination Levels ◽  
Practical Implications

Purpose – OTA is primarily produced by species of Penicillium and Aspergillus. This toxin has been detected worldwide in different grains such as rice. Due to OTA's toxicity and its effects on human's health, the authors performed this study to analyze the OTA's contamination levels in rice samples that gathered in different cities of Mazandaran (a province in northern Iran). The paper aims to discuss these issues. Design/methodology/approach – In this study, 80 rice samples were collected from several cities of Mazandaran. Data were analyzed using CD-ELISA method for OTA. Conjugated enzyme was added to uncoated-antibody wells and standard solution and sample extract were added to it. Solutions were transferred to the coated-antibody wells. Then, substrate was added to produce blue color. Finally, stopping solution was added to stop the reaction. The color intensity was inversely proportional to the OTA concentration, measured with the ELISA reader and calculated by analysis of variance by using the SPSS software package. Findings – None of the samples that were collected in Mazandaran were contaminated with >5 μg/kg of OTA in October. Also none of the samples from Amol, Fereydonkenar, Babol or Behshahr were contaminated with >5 μg/kg of this toxin in November. But in sari, Nowshahr and Ramsar the authors encountered samples that had >5 μg/kg of OTA contamination which is more than the acceptable limit. Practical implications – Screening and analyzing the rice fields are vital to detect any OTA contamination and can be effective for removing the contaminated rice. So proper strategies and management tactics are required in order to prevent OTA production in rice fields in pre- and post-harvest time and people must share their experiences regarding fighting this contamination. Originality/value – Since rice is used extensively all over the world, consumption of contaminated rice causes diseases for humans. Therefore, determination, management, and prevention of OTA should be considered seriously.

scholarly journals Effects of forest roads on Ips sexdentatus infestation in black pine forest

2018 ◽  
Vol 6 (7) ◽  
pp. 828
Author(s):  
Gonca Ece Özcan ◽  
Korhan Enez ◽  
Burak Arıcak
Keyword(s):  
Bark Beetle ◽  
Bark Beetles ◽  
Forest Ecosystems ◽  
Significant Risk ◽  
Pine Forests ◽  
Slope Aspect ◽  
Black Pine ◽  
Forest Roads ◽  
Forest Road ◽  
Ips Sexdentatus

Forest roads are important transportation equipment through forested areas in the rugged, mountainous terrain of northern Turkey. Forest roads harm forest ecosystems due to both the manner in which they are established and how they are used afterwards. Damage to trees that occur during road construction through forests stresses trees, which facilitates outbreaks of bark beetle populations. Bark beetles are significant risk to the health and productivity of Turkish pine forests and to pine forests worldwide. In particular, Ips sexdentatus (Boerner) (Coleoptera, Curculionidae, Scolytinae) is a particularly destructive species of bark beetle in Turkish forests. Their damage to coniferous trees threatens the sustainability of the forest ecosystems. This study primarily aims to assess the intensity of damage that I. sexdentatus inflicts on Pinus nigra J.F.Arnold stands relative to several parameters: the distance to the nearest forest road, aspect (shady - sunny), slope (0–15% or >15%), and other stand characteristics. In this study, we show how damage by an I. sexdentatus infestation in pure black pine stands varies with distance to forest roads and in situ edaphic factors. We sampled 45 plots (400 m2 each), slope, aspect and distances to the nearest forest road was determined using ArcGIS software and the region’s road network overlays. Results showed that trees located within 100 m from the nearest forest road were the most severely damaged ones. The intensity of I. sexdentatus damage was about 16% in a hectare. Trees that were in 16–20 cm diameter class were damaged more often. I. sexdentatus damage did not show any significant correlation with the slope, aspect or degree of canopy closure.

scholarly journals EMERGING TENDENCY OF BRANDS UTILIZATION AND ITS IMPACTS ON LIFE SATISFACTION OF UNIVERSITY STUDENTS

2021 ◽  
Vol 9 (4) ◽  
pp. 69-77
Author(s):  
Abd ul Waheed ◽  
Iqra Almas ◽  
Umme Kalsoom ◽  
Laila Shafi ◽  
Kanwal Yasmin
Keyword(s):  
Life Satisfaction ◽  
Regression Analysis ◽  
University Students ◽  
Research Method ◽  
Linear Regression Analysis ◽  
Demographic Variables ◽  
Satisfaction Level ◽  
Cosmetic Products ◽  
Proportional Allocation ◽  
Spss Software

Purpose of the study: This research examines the emerging tendency of brands utilization and its impacts on the life satisfaction of university students. Methodology: It is a quantitative study where a survey research method has been used, and for data collection, the questionnaire has been prepared. Demographic variables like area, age, gender, qualification, and location are also included. A sample of 385 students was selected by using the proportional allocation method. Statistical analysis for data was done through SPSS software. Researchers used a linear regression analysis test to find out the impacts of brand utilization on the life satisfaction of university students. Principal Findings: The findings of the study show that life satisfaction has a significantly negative correlation with brand utilization. Research also indicates that most purchased items were branded clothing and cosmetic products. Application of the study: This paper will be helpful to understand brand utilization and its impacts on youth’s life satisfaction. Novelty/Originality of this study: To analyze the growing tendency of luxury and brands products, researchers determined to check the impacts of branded products on life satisfaction levels. To examine the impacts of brand utilization, this research focused on four Pakistani universities and the life satisfaction level of students has bees examined.

scholarly journals PengaruhUtangdan PerputaranModalKerjaTerhadapProfitabilitasPerusahaan(Studi Kasus Pada PT Bumi Sekar Tbk Periode 2013-2018)

2020 ◽  
Vol 15 (1) ◽  
pp. 32
Author(s):  
Saprudin ◽  
Bayu Hartono
Keyword(s):  
Regression Analysis ◽  
Linear Regression ◽  
Quantitative Research ◽  
Linear Regression Analysis ◽  
Strong Relationship ◽  
Financial Statements ◽  
Working Capital ◽  
Weak Relationship ◽  
Spss Software ◽  
Relationship Of

This study aims to determine how much influence the debt, working capital turnover has on the profitability of PT Sekar Bumi Tbk. Debt is proxied by DER, working capital turnover is proxied by WCT, while profitability is proxied by ROA. Based on the nature of the data used in this study is a type of quantitative research. Samples were taken, namely PT Sekar Bumi Tbk with the objectof research of 2013-2018 financial statements. Linear regression analysis was used in this study, with the help of SPSS software for Windows 20.0. The results of this study explain that partially DER has a significant effect on ROA, and has a very strong relationship of 83.9%. WCT has no significant effect on ROA, and has a very weak relationship of 18.4%. However, simultaneously DER and WCT has a significant effect with a contribution of 70.8% to ROA. So companies need to pay attention and consider how much effective the use of debt as a source of funding for the company.

scholarly journals Forest road and public purpose investment

2019 ◽  
Vol 61 (4) ◽  
pp. 278-283
Author(s):  
Ewa Katarzyna Czech
Keyword(s):  
Social Interest ◽  
Nature Management ◽  
Local Authorities ◽  
Forest Roads ◽  
Mutual Cooperation ◽  
Forest Road ◽  
Public Purpose ◽  
Legal Problems ◽  
Legal Science ◽  
Administrative Courts

Abstract The functioning of forest districts in Poland should be based on their mutual cooperation with local authorities in order to achieve social interest, one of the examples of which is construction or reconstruction of roads. Due to the fact that achieving mutual investments encounter real legal problems arising from underspecified and unclear concepts, an assessment should be made of whether the construction and reconstruction of forest roads is a public purpose and also answer, what is a forest and forest road within the meaning of the provisions of the Act. It is necessary to present views of legal science and jurisdiction of administrative courts. The judicial direction of administrative courts is not beneficial for achieving investments; it does not even take into account that one of the investors’ purposes – forest districts – is nature management. Presenting the contrary argumentation to judicature positions should help courts make a proper assessment in the interpretation of provisions.

scholarly journals Factors affecting revenue of fisherman in Asamjawa Raya Village, South Labuhanbatu Regency, North Sumatra

2021 ◽  
Vol 912 (1) ◽  
pp. 012040
Author(s):  
Desrita ◽  
R Rambey ◽  
B D Aritonang ◽  
R Leidonald ◽  
Z A Harahap
Keyword(s):  
Regression Analysis ◽  
Linear Regression ◽  
Research Method ◽  
Working Time ◽  
Fishing Gear ◽  
Factors Affecting ◽  
Spss Software ◽  
Large Water ◽  
North Sumatra ◽  
Descriptive Method

Abstract South Labuhanbatu Regency has quite large water resources with the Barumun River which crosses Pasir Tuntung Village, Asamjawa Village, Kotapinang Village and Sisumut Village. This study aims to determine the factors that influence the income of fishermen in Asamjawa Village, South Labuhanbatu Regency. This research method is a descriptive method with a questionnaire tool and the data obtained were analyzed using SPSS software. The variables observed were fisherman’s income, fisherman’s education, length of time working as a fisherman, area of fishing location, daily working time, number of fishing gear and number of fisherman catches. The linear regression model of fishermen’s income in Asamjawa Village was obtained as follows: Y = -19.344,10 + 392.699,10 X1 - 5.024,53 X2 + 73.255,48 X3 + 16.349,29 X4 + 135.819,41 X5 + 12.465,72 X6. The regression analysis results obtained three variables that significantly affect the income of fishermen in Asamjawa Village, Torgamba District, South Labuhanbatu Regency. Where the variables that have a significant effect are the education variable, the number of catches, and daily working time.

IDENTIFICATION OF CURVATURE RADIUS FOR CURVED SECTIONS ON FOREST ROADS IN THE PROCESS OF UTILISATION

2021 ◽  
Vol 14(63) (1) ◽  
pp. 47-56
Author(s):  
Ihor RUDKO ◽  
Borys BAKAY ◽  
Abdullah AKAY ◽  
Vasyl BARYLIAK ◽  
Stanislav HORZOV
Keyword(s):  
Technical Information ◽  
Radius Of Curvature ◽  
Curvature Radius ◽  
Forest Roads ◽  
Forest Road ◽  
Advantages And Disadvantages ◽  
Natural Production ◽  
Angle Deviation ◽  
Road Projects ◽  
Selection Of

This article reviews the problem of measuring the actual radius of curvature for curved sections of existing forest roads, as forestry enterprises require reliable technical information about the current conditions of operated transport networks. It was identified that at this moment, a selection of methods are used for measuring the radii of horizontal curved sections of roads, which have certain advantages and disadvantages in specific natural production conditions. For calculating the radius of curvature for auto forest road projects it is recommended to apply the method of measured angles by chord angle deviation, which is sufficiently accurate for engineering purposes and does not require usage of special high-precision equipment and tools.

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