scholarly journals DENSITY EFFECTS AND ITS RELATIONSHIP WITH MAJOR FLAME CHARACTERISTICS OF SELECTED FIRE TOLERANT TREES IN SOUTH-EAST NIGERIA: A LOOK AT OVEN AND SUN DRIED TIMBERS

2020 ◽  
Vol 45 (5) ◽  
Author(s):  
V. N. Okafor ◽  
U. W. Okafor ◽  
R. I. Anyalebechi ◽  
M. C. Obiadi ◽  
J. N. Obiefuna ◽  
...  
Keyword(s):  
Moisture Content ◽  
Flame Propagation ◽  
Tree Species ◽  
Mangifera Indica ◽  
Ignition Time ◽  
Tectona Grandis ◽  
Propagation Rate ◽  
Density Relationship ◽  
Ash Formation ◽  
Similar Density

Physical and flame characteristics of fifteen tree species in South-East Nigeria were investigated. The tree species Daniellia oliveri, Anacadium occidentale, Vitex doniana, Lonchocarpus griffonianus, Gmelina arborea, Nauclea latifolia, Tectona grandis, Mangifera indica, Delonix regia, Newbouldia laevis, Azadirachta indica, Dialium guineense, Terminalia superba, Manilkara obovata and Irvingia gabonensis were identified and named by taxonomists. The aim was to investigate the effects of oven and sun dried densities of timbers on major flame characteristics (ignition time, flame propagation rate, after glow time, flame duration and ash formation) and to establish timber density relationship with the flame properties. Physical properties (density and moisture content) and flame characteristics of all the timbers were carried out using their respective standard methods. Oven and sun dried densities of timbers ranged from 0.39 to 0.97 and 0.45 to 1.16 g/cm3 respectively. Moisture content of oven and sun dried timbers ranged from 8.02 to 11.56% and 8.15 to 11.65 % respectively. The range of values for ignition time were (3.00-10.00) seconds for oven dried timbers and (5.00-10.00) seconds for sun dried timbers. Flame propagation rate ranged between 0.15 and 0.27 cm/s and from 0.09 to 0.25 cm/s for oven and sun dried timbers respectively. The values for flame duration ranged from 12.00 to 56.00 seconds for oven dried timbers and 7.00 to 45.00 seconds for sun dried timbers. Afterglow times of oven and sun dried timbers ranged from 70.00 to 267.00 and 19.00 to 188.00 seconds respectively. Ash formation values ranged from 0.19 to 2.38 and 0.25 to 2.46 % for oven and sun dried timbers respectively. Combustion/pyrolysis pattern of oven and sun dried timbers on exposure to fire was similar. Density related to flame propagation rate, although, for the denser hard woods above 0.60g/cm3 and 0.70g/cm3 for oven and sun dried timbers respectively, this dependence was less straight forward. The flame characteristics of the oven dried timbers compared favourably with sun dried timbers and showed that ignition time, flame duration, afterglow time and ash formation have no clear relationship with timber density.

scholarly journals Correlations of Major Flame Characteristics of Some Fire Tolerant Trees in South-East Nigeria by Coefficient of Determination (R2)

2020 ◽  
pp. 81-98
Author(s):  
Vincent Nwalieji Okafor ◽  
Matthew Chiemezie Obiadi ◽  
Joy Ngozika Obiefuna
Keyword(s):  
Physical Properties ◽  
Wood Density ◽  
Flame Propagation ◽  
Tree Species ◽  
Oxygen Index ◽  
Mangifera Indica ◽  
Ignition Time ◽  
Propagation Rate ◽  
Limiting Oxygen Index ◽  
Afterglow Time

Background: Bush fire is a common hazard in South East-Nigeria as in other parts of the country during the harmattan. Every year, thousands of hectares of forests as well as suburban lands are severely burnt. These forest fires have been catastrophic, destroying large areas of tropical rain forests and in most cases have claimed many lives and destroyed properties worth millions of naira. However, some of these trees identified by local people and named by taxonomists as Daniellia oliveri, Anacadium occidentale, Vitex doniana, Lonchocarpus griffonianus, Gmelina arborea, Nauclea latifolia, Tectona grandis, Mangifera indica, Delonix regia, Newbouldia laevis, Azadirachta indica, Dialium guineense, Terminalia superba, Manilkara obovata and Irvingia gabonensis have proven to be fire tolerant. Aim: The aim is to establish correlations among the physical properties (wood density and moisture content) and flame characteristics (ignition time, flame propagation rate, flame duration, afterglow time, ash formation and limiting oxygen index) of these fire tolerant trees. Study Design: An item structured instrument was developed by the researchers which reflected the six points modified Likert scale of strongly agree, agree, somewhat agree, somewhat disagree, disagree, strongly disagree and used to elicit information from the respondents who were mainly seasoned wood dealers of above 60 years of age. Analysis of Variance (ANOVA) was the major tool of analysis used to establish whether the tree species tolerates fire or not while correlation of the parameters was achieved by the application of R2. Place and Duration of Study: Determination of both the physical properties and flame characteristics of the tree species was done at the Research Laboratory of the Department of Pure and Industrial Chemistry, Nnamdi Azikiwe University, Awka between June, 2018 and April, 2019. Methodology: The physical properties of the tree species as well as their flame characteristics were carried out using their standard methods. Results: The values for these parameters vary among the tree species. Correlation among the parameters indicates a determination coefficient range from 0.000 to 0.637. Conclusion: There are highly significant correlations between wood density and both ignition time and flame propagation rate as well as wood density and limiting oxygen index. There is also strong correlation between ignition time and both flame propagation rate and limiting oxygen index. Afterglow time depends on limiting oxygen index and vice versa.

scholarly journals CONTRIBUTION Of RIPARIAN VEGETATION TO WATER QUALITY IN SPRING WATER ORAS

2021 ◽  
Vol 2 (1) ◽  
pp. 28-32
Author(s):  
Yulita Iryani Mamulak ◽  
Chatarina Gradict Semiun
Keyword(s):  
Water Quality ◽  
Natural Resources ◽  
Tree Species ◽  
Riparian Vegetation ◽  
Cocos Nucifera ◽  
Mangifera Indica ◽  
Species Abundance ◽  
Tectona Grandis ◽  
Artocarpus Altilis ◽  
Quality Testing

Soba Village, West Amarasi Subdistrict, Kupang Regency is located in East Nusa Tenggara Province with abundant natural resources. One of the natural resources  is  a natural spring with  abundant diversity of riparian vegetation. The diversity of riparian vegetation around water sources plays an important role in water quality. This study aimed to identify the diversity of riparian vegetation around springs and to determine water quality. The method used was plot installation, identification of riparian vegetation types, measurement of environmental factors and water quality testing. The results showed that there were 12 species of tree vegetation with a total of 74 individuals, the most common tree species found was Canangan odorata with a relative abundance of 24.32%, followed by Cocos nucifera 18.92%, and Areca sp. 16.22%. Meanwhile, the least species found were Tectona grandis, Mangifera indica, Artocarpus altilis, and Syzygium aqueum with relative species abundance of 1.35%. The results of quantitative analysis of the relative frequency found tree species Areca sp. and Cocos nucifera had the highest value, namely 19.05%. Meanwhile, the highest relative dominance value was found in thespecies Artocarpus altilis. The results of water quality testing with 3 parameters namely physical, chemical and bacteriological showed a COD value of 85.03 mg / L, a total colifrorm of 45 and a total fecal colliform  of 230

The Horizontal Flame-Propagation Rate of Undyed Cotton Fabrics

1976 ◽  
Vol 46 (4) ◽  
pp. 238-246 ◽  
Author(s):  
Leon Segal ◽  
G. L. Drake
Keyword(s):  
Relative Humidity ◽  
Moisture Content ◽  
Equilibrium Moisture Content ◽  
Flame Propagation ◽  
Propagation Rate ◽  
Cotton Fabrics ◽  
Horizontal Position ◽  
Test Procedures ◽  
Oven Drying ◽  
Usual Test

Differentiation of the flammabilities of nonflame-retardant, all-cotton fabrics cannot be accomplished by the usual test procedures, as these merely provide the means for determining when a fabric exceeds a certain set standard. The desired differentiation, however, can be obtained by measurement of the flame-propagation rate using the Ahiba Flammability Tester with the sample in the horizontal position. Eight nonflame-retardant, undyed cotton fabrics of different constructions were studied. The weights of the fabrics fell into four groups: 3.1, 3.6–3.8, 4.1–4.4, and 7.5 oz/yd2. Specimens were cut from the warp and filling directions of the fabrics; one set of specimens was oven-dried prior to testing, while another set was conditioned to equilibrium moisture content at 65% relative humidity and 70°F. Burning was different in the warp and filling directions. Differences in flame-propagation rates were found that were not weight dependent. In general, flame-propagation rate was not constant over the length of the specimen; in the warp direction the rates increased with distance from point of ignition, while in the filling direction constant and decreasing rates were also found. Flame-propagation rate was not effected to the extent expected by changing from oven drying to conditioning to equilibrium moisture content; only four of the eight fabrics showed significant changes. Burning in the filling directions of two fabrics was markedly changed; smaller differences were found in the warp direction only of a third fabric and in both the warp and filling directions of a fourth fabric.

scholarly journals Effects of road traffic on photosynthetic pigments and heavy metal accumulation in tree species of Kumasi Metropolis, Ghana

2021 ◽  
Vol 3 (1) ◽  
Author(s):  
Ufere N. Uka ◽  
Ebenezer J. D. Belford ◽  
Florence A. Elebe
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Photosynthetic Pigments ◽  
Tree Species ◽  
Metal Accumulation ◽  
Mangifera Indica ◽  
Polluted Site ◽  
Vehicular Pollution ◽  
Terminalia Catappa ◽  
Polyalthia Longifolia

AbstractThis study was undertaken to examine changes in the content of pigments and accumulation of metals from vehicular pollution in selected species of roadside trees under vehicular pollution. A major arterial road with heavy vehicle emissions in the Kumasi Metropolis was designated as the polluted site, while Kwame Nkrumah University of Science and Technology Campus was designated as the control site. Four tree species (Terminalia catappa, Mangifera indica, Ficus platyphylla and Polyalthia longifolia) selected for the study were well distributed and abundant in the polluted and control sites. Photosynthetic pigments and levels of heavy metals (Pb, Cu, Cd and zinc) were assessed in their leaves. Chlorophyll and carotenoid contents were determined by absorption spectrometry, while the metal accumulation index (MAI) was used to determine the total metal accumulation capacity of the tree species. We observed a reduction in photosynthetic pigments in the leaf samples from the polluted site. Ficus platyphylla had the maximum reduction in total chlorophyll (49.34%), whereas Terminalia catappa recorded the lowest reduction (33.88%). Similarly, the largest decrease (31.58%) of carotenoid content was found in Terminalia catappa trees and the lowest in Polyalthia longifolia (16.67%). The Polyalthia longifolia, Ficus platyphylla and Terminalia catappa leaf samples collected at the polluted site recorded a higher ratio of chlorophyll a/b. Heavy metal (Cu, Pb, Zn and Cd) accumulation in leaf samples was higher in the polluted site than in the control, as expected. The highest metal MAI value was recorded in Mangifera indica (5.35) followed by Polyalthia longifolia with 4.30. The findings from this study specifically demonstrate that air contamination induced by vehicles decreases the level of photosynthetic pigments in trees subjected to roadside emissions. It is clear that both chlorophyll a/b and chlorophyll/carotenoid ratios will act as very useful stress-level markers. Elevated heavy metal levels in the tree species along arterial roadsides indicate that they serve as heavy metals sink. The change in MAI resulting from different pollution burden is an indication that the removal capabilities of the tree species differ from each other. We therefore suggest M. indica and P. longifolia as potential species to be used in air pollution reduction plans in the city.

Flame propagation rate in air suspensions of metal powders

1983 ◽  
Vol 19 (5) ◽  
pp. 564-566 ◽  
Author(s):  
A. G. Alekseev ◽  
I. V. Sudakova
Keyword(s):  
Flame Propagation ◽  
Propagation Rate ◽  
Metal Powders

Experimental study of moisture content effects on horizontal flame spread over thin cotton fabric

2018 ◽  
Vol 89 (15) ◽  
pp. 3189-3200 ◽  
Author(s):  
Yunji Gao ◽  
Guoqing Zhu ◽  
Hui Zhu ◽  
Weiguang An ◽  
Yu Xia
Keyword(s):  
Moisture Content ◽  
Cotton Fabric ◽  
Flame Spread ◽  
Extreme Values ◽  
Ignition Time ◽  
Convective Heat Transfer Coefficient ◽  
Flame Height ◽  
Spread Rate ◽  
Untreated Cotton ◽  
Flame Spread Rate

In this paper, moisture content effects on horizontal flame spread were experimentally investigated using 0.245 mm thick, 28 cm tall and 28 cm wide untreated cotton fabric sheets with various moisture contents varying from 0 to 34%. The pyrolysis spread rates, flame heights and ignition times were obtained and analyzed. The corresponding results are as follows: as moisture content increases, the flame height and spread rate first increase and then decrease. In contrast, the ignition time shows an opposite trend with moisture content. The extreme values are observed in cases of 2% moisture content samples. Moreover, the flame spread rate in the warp direction is larger than that in the weft direction. For horizontal flame spread, the moisture content has the effect of consuming part of the heat feedback, which can play a role in reducing the flame spread rate; simultaneously, the moisture content can enlarge flame size and increase the convective heat transfer coefficient, thereby resulting in an increase in flame spread rate. The non-monotonous trend in pyrolysis spread rate is the result of competition between these effects.

scholarly journals ASSESSMENT OF AIR POLLUTION TOLERANCE INDEX OF PLANTS: A COMPARATIVE STUDY

2017 ◽  
Vol 9 (7) ◽  
pp. 83 ◽  
Author(s):  
Aasawari A. Tak ◽  
Umesh B. Kakde
Keyword(s):  
Air Pollution ◽  
Azadirachta Indica ◽  
Tree Species ◽  
Tectona Grandis ◽  
Acacia Nilotica ◽  
Tolerance Index ◽  
Tamarindus Indica ◽  
Cassia Fistula ◽  
Pollution Tolerance ◽  
Air Pollution Tolerance Index

Objective: Air pollution is one of the major global tribulations in many developing cities around the world. Addressing this sort of pollution is more intricate than other ecological challenges. As pollution is an upcoming issue, we aimed at assessing the air pollution tolerant plants from roadside exposed to vehicular air pollution from two different locations in Thane city.Methods: In the present study, commonly available ten roadside tree species selected from polluted and control area, and their air pollution tolerance index (APTI) determined in Thane city. The biochemical parameters viz. pH, ascorbic acid, total chlorophyll, relative water content (RWC) were considered to calculate APTI by using standard method.Results: The study shows that the control site has more APTI than the polluted site. The APTI observed minimum in Tectona grandis 5.2±0.3247 and maximum in Azadirachta indica 13.5±0.4404. Reduction in APTI at polluted site shows that Alstonia scholaris (6.6%), Tamarindus indica (8.8%) and Azadirachta indica (10.3%) were the most tolerant tree species, while Tectona grandis (47.5%), Acacia nilotica (27.4%) and Cassia fistula (20.7%) were more sensitive tree species. The results showed the order of tolerance (% difference in APTI) as Alstonia scholaris (6.6%)>Tamarindus indica (8.8%)>Azadirachta indica (10.3%)>Moringa pterygosperma (11.9%)>Mangifera indica (13.9%)>Bahunia variegate (14.3%)>Annona squamosa (18.7%)>Cassia fistula (20.7%)>Acacia nilotica (27.4%)>Tectona grandis (47.5%).Conclusion: Tolerant trees species can serve as a sink, and sensitive tree species can act as an indicator for air pollution mitigation. Thus, this study provides useful insights for selecting tolerant species for future planning and Greenbelt development in urban areas.

scholarly journals Standardization of Mango (Mangifera Indica L.) Peel Simplisia of Gadung Variety

2021 ◽  
Vol 1 (1) ◽  
pp. 1-8
Author(s):  
Andini Andini ◽  
Cindy Fernanda Putri
Keyword(s):  
Moisture Content ◽  
Mangifera Indica ◽  
Quality Standard ◽  
Ash Content ◽  
Water Soluble ◽  
Raw Material ◽  
Yellow Colour ◽  
Water Soluble Compound ◽  
Mango Peel ◽  
Compound Concentration

Mango peel (Mangfera indica L.) has many pharmacological effects as a traditional medicine. Therefore, standardization of mango peel simplisia needs to be done as a preparation of phytopharmaca raw material. This research aimed to obtain standardization of mango peel simplisia include specific and non-specific parameter. The research procedures include plant determination, simplisia preparation as well as specific standardization test (includes organoleptic, water-soluble compound concentration, and ethanol solution compound concentration) and nonspecific standardization test (includes moisture content, dried shrinkage, total ash content and acid insoluble ash content). The specific organoleptic parameters of dried mango peel simplisia have a distinctive sweet aroma, bitter taste, and brownish yellow colour. Water-soluble and ethanol-soluble concentrations are 22,36% ± 1,17% and 9,56% ± 0,07%. Moisture content is 9,09% ± 1,44%. Dried shrinkage rate is 0,19% ± 0,04%. Total ash and acid insoluble ash contents are 4,11% ± 0,10% and 0,14% ± 0,03%. The mango peel simplisia has met the quality standard of the raw material.

scholarly journals Characteristics of Woody Cutting Waste Briquette with Paper Waste Pulp as Binder

2020 ◽  
Vol 190 ◽  
pp. 00030
Author(s):  
Qurrotin Ayunina Maulida Okta Arifianti ◽  
Azmi Alvian Gabriel ◽  
Syarif Hidayatulloh ◽  
Kuntum Khoiro Ummatin
Keyword(s):  
Moisture Content ◽  
Ignition Time ◽  
Combustion Process ◽  
Calorific Value ◽  
Volatile Matter ◽  
Proximate Analysis ◽  
Hydraulic Press ◽  
Combustion Characteristic ◽  
Paper Waste ◽  
Iron Mold

The current research aimed to increase the calorific value of woody cutting waste briquette with paper waste pulp as binder. There were three different binder variation used in this study, they are 5 %, 10 %, and 15 %. To create a briquette, a cylindrical iron mold with diameter of 3.5 cm and height of 3 cm and a hydraulic press with 2 t power were applied. The physical characteristics of the combination woody waste briquette and paper waste pulp, such as moisture content, ash content, volatile matter and carbon fix were examined using proximate analysis. The calorific value of briquetted fuel was tested by bomb calorimeter. The combustion test was performed to determine the combustion characteristic of briquettes, for example initial ignition time, temperature distribution, and combustion process duration. The general result shows that the calorific value of briquette stood in the range of 4 876 kCal kg–1 to 4 993 kCal kg–1. The maximum moisture content of briquette was 5.32 %. The longest burning time was 105 min.

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