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  Subjects -> SOCIAL SCIENCES (Total: 1610 journals)
    - BIRTH CONTROL (21 journals)
    - CHILDREN AND YOUTH (251 journals)
    - FOLKLORE (30 journals)
    - MATRIMONY (16 journals)
    - MEN'S INTERESTS (17 journals)
    - MEN'S STUDIES (91 journals)
    - SEXUALITY (52 journals)
    - SOCIAL SCIENCES (917 journals)
    - WOMEN'S INTERESTS (44 journals)
    - WOMEN'S STUDIES (171 journals)

SOCIAL SCIENCES (917 journals)            First | 1 2 3 4 5     

Showing 401 - 136 of 136 Journals sorted alphabetically
International Journal of Sociology and Social Policy     Hybrid Journal   (Followers: 55)
International Journal of Synergy and Research     Open Access  
International Journal of Undergraduate Research and Creative Activities     Open Access   (Followers: 2)
International Journal Pedagogy of Social Studies     Open Access  
International Quarterly for Asian Studies     Open Access  
International Review of Qualitative Research     Full-text available via subscription   (Followers: 32)
International Review of Social Research     Open Access   (Followers: 3)
International Scholarly Research Notices     Open Access   (Followers: 204)
International Social Science Journal     Hybrid Journal   (Followers: 23)
International Studies. Interdisciplinary Political and Cultural Journal     Open Access   (Followers: 9)
Internationale Revue Fur Soziale Sicherheit     Hybrid Journal   (Followers: 1)
InterSciencePlace     Open Access   (Followers: 1)
Investigación Valdizana     Open Access  
Investigación y Desarrollo     Open Access   (Followers: 1)
Investigaciones Geográficas (Esp)     Open Access  
Irish Journal of Applied Social Studies     Open Access   (Followers: 5)
Issues in Social Science     Open Access   (Followers: 5)
Ithaca : Viaggio nella Scienza     Open Access  
IULC Working Papers     Open Access  
Ius et Praxis     Open Access  
JICSA : Journal of Islamic Civilization in Southeast Asia     Open Access  
Journal for New Generation Sciences     Open Access   (Followers: 4)
Journal for Semitics     Full-text available via subscription   (Followers: 8)
Journal of Addiction & Prevention     Open Access   (Followers: 1)
Journal of Advanced Academic Research     Open Access   (Followers: 2)
Journal of Agriculture and Social Research (JASR)     Open Access   (Followers: 5)
Journal of Agriculture, Forestry and the Social Sciences     Full-text available via subscription   (Followers: 5)
Journal of Applied Social Psychology     Hybrid Journal   (Followers: 54)
Journal of Applied Social Science     Hybrid Journal   (Followers: 17)
Journal of Arabic and Islamic Studies     Open Access  
Journal of Arts and Social Sciences     Open Access  
Journal of ASIAN Behavioural Studies     Open Access   (Followers: 4)
Journal of Cognition and Culture     Hybrid Journal   (Followers: 16)
Journal of Comparative Social Welfare     Hybrid Journal   (Followers: 18)
Journal of Contemporary African Studies     Hybrid Journal   (Followers: 4)
Journal of Critical Race inquiry     Open Access   (Followers: 10)
Journal of Cultural Economy     Hybrid Journal   (Followers: 9)
Journal of Cultural Heritage     Full-text available via subscription   (Followers: 16)
Journal of Development Effectiveness     Hybrid Journal   (Followers: 5)
Journal of Economy Culture and Society     Open Access  
Journal of Educational Social Studies     Open Access   (Followers: 9)
Journal of Family & Consumer Sciences     Full-text available via subscription   (Followers: 1)
Journal of Family Studies     Hybrid Journal   (Followers: 10)
Journal of Globalization and Development     Hybrid Journal   (Followers: 12)
Journal of Human Security     Open Access   (Followers: 10)
Journal of Humanity     Open Access   (Followers: 5)
Journal of Ilahiyat Researches     Open Access  
Journal of Indian Ocean World Studies     Open Access  
Journal of Interdisciplinary Gender Studies: JIGS     Full-text available via subscription   (Followers: 17)
Journal of Iran Cultural Research     Open Access   (Followers: 1)
Journal of Korean Studies     Full-text available via subscription   (Followers: 12)
Journal of Language and Social Psychology     Hybrid Journal   (Followers: 13)
Journal of Markets & Morality     Partially Free  
Journal of Mediterranean Knowledge     Open Access   (Followers: 6)
Journal of Men, Masculinities and Spirituality     Full-text available via subscription   (Followers: 13)
Journal of Methods and Measurement in the Social Sciences     Open Access   (Followers: 4)
Journal of Migration and Refugee Issues, The     Full-text available via subscription   (Followers: 34)
Journal of Organisational Transformation & Social Change     Hybrid Journal   (Followers: 6)
Journal of Pan African Studies     Open Access   (Followers: 2)
Journal of Personality and Social Psychology     Full-text available via subscription   (Followers: 304, SJR: 4.302, CiteScore: 6)
Journal of Policy Practice     Hybrid Journal   (Followers: 5)
Journal of Poverty and Social Justice     Full-text available via subscription   (Followers: 28)
Journal of Progressive Research in Social Sciences     Open Access   (Followers: 4)
Journal of Purdue Undergraduate Research     Open Access   (Followers: 1)
Journal of Relationships Research     Hybrid Journal   (Followers: 5)
Journal of Religion & Spirituality in Social Work: Social Thought     Hybrid Journal   (Followers: 10)
Journal of Research in National Development     Full-text available via subscription  
Journal of Responsible Innovation     Hybrid Journal   (Followers: 7)
Journal of Social Change     Open Access   (Followers: 7)
Journal of Social Development in Africa     Full-text available via subscription   (Followers: 5)
Journal of Social Distress and the Homeless     Hybrid Journal   (Followers: 6)
Journal of Social Intervention: Theory and Practice     Open Access   (Followers: 1)
Journal of Social Issues     Hybrid Journal   (Followers: 18)
Journal of Social Philosophy     Hybrid Journal   (Followers: 23)
Journal of Social Science Education : JSSE     Open Access  
Journal of Social Science Studies     Open Access   (Followers: 12)
Journal of Social Sciences     Open Access   (Followers: 16)
Journal of Social Structure     Open Access  
Journal of Social Studies Research     Full-text available via subscription   (Followers: 14)
Journal of Studies in Social Sciences     Open Access   (Followers: 6)
Journal of Technology in Human Services     Hybrid Journal   (Followers: 4)
Journal of the Bangladesh Association of Young Researchers     Open Access   (Followers: 1)
Journal of the Polynesian Society     Full-text available via subscription   (Followers: 7)
Journal of the Society for Social Work and Research     Full-text available via subscription   (Followers: 11)
Journal of the University of Ruhuna     Open Access   (Followers: 1)
Journal of Transnational American Studies     Open Access   (Followers: 3)
Journal of Trust Management     Open Access   (Followers: 4)
Journal Sampurasun : Interdisciplinary Studies for Cultural Heritage     Open Access   (Followers: 1)
Jurnal Abdimas     Open Access  
Jurnal Biometrika dan Kependudukan     Open Access  
Jurnal Ilmiah Ilmu Sosial     Open Access   (Followers: 1)
Jurnal Ilmu Sosial dan Humaniora     Open Access  
Jurnal Kawistara     Open Access  
Jurnal Lakon     Open Access  
Jurnal Masyarakat dan Budaya     Open Access  
Jurnal Pendidikan Ilmu Sosial     Open Access   (Followers: 1)
Jurnal Sosial Humaniora     Open Access   (Followers: 2)
Jurnal Teori dan Praksis Pembelajaran IPS     Open Access  
Jurnal Terapan Abdimas     Open Access  
Just Policy: A Journal of Australian Social Policy     Full-text available via subscription   (Followers: 15)
Kaleidoscope     Open Access  
Kasetsart Journal of Social Sciences     Open Access   (Followers: 2)
Kervan. International Journal of Afro-Asiatic Studies     Open Access  
Kimün. Revista Interdisciplinaria de Formación Docente     Open Access  
Kırklareli Üniversitesi Sosyal Bilimler Dergisi     Open Access  
Knowledge Management for Development Journal     Hybrid Journal   (Followers: 10)
Kontext : Zeitschrift für Systemische Therapie und Familientherapie     Hybrid Journal  
Korea : Politik, Wirtschaft, Gesellschaft     Open Access  
Korean Social Science Journal     Hybrid Journal   (Followers: 2)
Kotuitui : New Zealand Journal of Social Sciences Online     Open Access   (Followers: 17)
Kulttuurintutkimus     Open Access  
Kulturwissenschaftliche Zeitschrift     Open Access   (Followers: 2)
KZfSS Kölner Zeitschrift für Soziologie und Sozialpsychologie     Hybrid Journal   (Followers: 17)
L'Homme. Europäische Zeitschrift für Feministische Geschichtswissenschaft     Hybrid Journal   (Followers: 4)
L'Ordinaire des Amériques     Open Access  
La Tercera Orilla     Open Access  
Labyrinthe     Open Access  
Language and Intercultural Communication     Hybrid Journal   (Followers: 23)
Language Resources and Evaluation     Hybrid Journal   (Followers: 5)
Lavboratorio : Revista de Estudios sobre Cambio Estructural y Desigualdad Social.     Open Access  
Lectio Socialis     Open Access  
Les Cahiers des dix     Full-text available via subscription   (Followers: 1)
Les Cahiers d’EMAM     Open Access   (Followers: 1)
Letras Verdes. Revista Latinoamericana de Estudios Socioambientales     Open Access   (Followers: 2)
Letters on Evolutionary Behavioral Science     Open Access  
Lex Social : Revista de Derechos Sociales     Open Access   (Followers: 1)
Lilith: A Feminist History Journal     Full-text available via subscription   (Followers: 4)
Liminar. Estudios Sociales y Humanisticos     Open Access   (Followers: 3)
Literacy Learning: The Middle Years     Full-text available via subscription   (Followers: 6)
Local-Global: Identity, Security, Community     Full-text available via subscription   (Followers: 4)
Loisir et Société / Society and Leisure     Hybrid Journal   (Followers: 1)
Lucero     Open Access  
Lúdicamente     Open Access   (Followers: 1)
Lutas Sociais     Open Access   (Followers: 1)
Lwati : A Journal of Contemporary Research     Full-text available via subscription   (Followers: 2)
Macedon Digest, The     Full-text available via subscription   (Followers: 1)
Maine Policy Review     Open Access   (Followers: 2)
Maskana     Open Access  
Mathématiques et sciences humaines     Open Access   (Followers: 7)
Mayéutica Revista Científica de Humanidades y Artes     Open Access  
McNair Scholars Research Journal     Open Access  
McNair Scholars Research Journal     Open Access  
Meanjin     Full-text available via subscription   (Followers: 1)
Meanjin     Full-text available via subscription   (Followers: 3)
Meanjin Papers     Full-text available via subscription   (Followers: 2)
Media Information Australia     Full-text available via subscription  
Media International Australia     Hybrid Journal   (Followers: 2)
Media International Australia     Full-text available via subscription   (Followers: 1)
Melbourne Journal of Politics     Full-text available via subscription   (Followers: 1)
Mémoire(s), identité(s), marginalité(s) dans le monde occidental contemporain     Open Access   (Followers: 1)
Memorias     Open Access   (Followers: 1)
Meridional : Revista Chilena de Estudios Latinoamericanos     Open Access  
methaodos.revista de ciencias sociales     Open Access   (Followers: 3)
Methodological Innovations     Open Access  
Methods, Data, Analyses     Open Access  
México y la Cuenca del Pacífico     Open Access  
Middle East Journal of Culture and Communication     Hybrid Journal   (Followers: 6)
Migration Action     Full-text available via subscription   (Followers: 5)
Mikarimin. Revista Científica Multidisciplinaria     Open Access  
Mirai : Estudios Japoneses     Open Access  
Miscelánea Comillas. Revista de Ciencias Humanas y Sociales     Open Access  
Misión Jurídica     Open Access  
Mitologicas     Open Access  
Módulo Arquitectura - CUC     Open Access  
Monthly, The     Full-text available via subscription   (Followers: 1)
Moving the Social : Journal of Social History and the History of Social Movements     Full-text available via subscription   (Followers: 2)
Mukaddime     Open Access  
Mütefekkir     Open Access  
Müvészettörténeti Értesitö     Full-text available via subscription   (Followers: 1)
National Academy Science Letters     Hybrid Journal   (Followers: 5)
National Emergency Response     Full-text available via subscription   (Followers: 3)
National Observer     Full-text available via subscription   (Followers: 1)
Navigations : A First-Year College Composite     Open Access   (Followers: 1)
New Left Review     Full-text available via subscription   (Followers: 25)
New Perspectives on Turkey     Full-text available via subscription   (Followers: 3)
New Zealand International Review     Full-text available via subscription   (Followers: 19)
Newsletter of the Gypsy Lore Society     Hybrid Journal   (Followers: 1)
Nineteenth-Century Contexts: An Interdisciplinary Journal     Hybrid Journal   (Followers: 17)
Noesis. Revista de Ciencias Sociales y Humanidades     Open Access   (Followers: 2)
Nómadas     Open Access   (Followers: 1)
Nómadas. Revista Crítica de Ciencias Sociales y Jurídicas     Open Access   (Followers: 2)
Nordic Journal of Social Research     Open Access  
Nordisk kulturpolitisk tidsskrift     Open Access  
Northeast African Studies     Full-text available via subscription   (Followers: 2)
Nouvelles perspectives en sciences sociales : revue internationale de systémique complexe et d'études relationnelles     Full-text available via subscription   (Followers: 1)
Novos Cadernos NAEA     Open Access   (Followers: 1)
Novos Estudos - CEBRAP     Open Access   (Followers: 1)
Nytt Norsk Tidsskrift     Full-text available via subscription  
Observatorio Latinoamericano y Caribeño     Open Access  
Occasional Series in Criminal Justice and International Studies     Full-text available via subscription   (Followers: 4)
Oceania     Hybrid Journal   (Followers: 6)
OGIRISI : a New Journal of African Studies     Open Access   (Followers: 1)
Öneri Dergisi     Open Access  
Opcion     Open Access  
Open Cultural Studies     Open Access   (Followers: 1)
Open Family Studies Journal     Open Access  
Open Journal of Social Sciences     Open Access   (Followers: 6)
Orbis. Revista Cientifica Ciencias Humanas     Open Access   (Followers: 2)
Orbith : Majalah Ilmiah Pengembangan Rekayasa dan Sosial     Open Access   (Followers: 1)
Oregon Undergraduate Research Journal     Open Access   (Followers: 1)

  First | 1 2 3 4 5     

Similar Journals
Journal Cover
Journal of the University of Ruhuna
Number of Followers: 1  

  This is an Open Access Journal Open Access journal
ISSN (Print) 2345-9387
Published by Sri Lanka Journals Online Homepage  [50 journals]
  • A Study on Endophytic Fungi, Proximate and Chemical Compositions of a
           Local Variety of Mango Fruit (Mangifera indica L.)

    • Abstract: Mango (Mangifera indica L.) is an important tree which produce edible fruits. Different varieties of mango are available and well-studied. However, little attention has been shown to popular Ogbomoso variety especially for its endophytes and chemical profile. This work aimed at identifying endophytic fungi and carrying out proximate analysis as well as phytochemical analysis of the fruit. Potato Dextrose Agar was used as a medium for the isolation of fungi from the homogenized pulp. Proximate analysis was carried out using standard method of Association of Analytical Chemistry (AOAC). Fourier Transform Infrared Spectroscopy (FTIR) was done to determine characteristic peaks and functional groups of compounds using Thermo Scientific Nicolet iS5 with iD1 transmission. Gas Chromatography- Mass Spectrometry (GC-MS) was used to study the chemical profile of the sample. Aspergillus niger. A. flavus and Rhizopus stolonifer were the identified endophytes. Moisture and lipid were observed to be highest (76.87%) and lowest (0.38%) respectively in the sample. The amount of carbohydrate was 18.93%. The FTIR result revealed the presence of NH2, OH, CH2, C=O (carboxylic) and N-H 1o and 2o amine as important functional groups. A total of 23 compounds were found in the methanolic extract of the sample where Imidazolidin-2-one (18.43%) was the principal compound. N, N-dibenzylhydroxylamine (15.36%), Methyl hexadecanoate (7.33%), Hexadecamethylcyclooctasiloxane (4.51%) were also present in considerable quantities. It is confirmed that the homogenized pulp of Ogbomoso variety of mango fruit is rich in phytochemicals that are useful especially in pharmaceutical industries. Published on 2018-12-30 00:00:00
       
  • Methicillin-resistant Staphylococcus aureus: prevalence of and risk
           factors associated with colonization of patients on admission to the
           Teaching hospital, Karapitiya

    • Abstract: Methicillin-resistant Staphylococcus aureus (MRSA) causes a substantial burden of community-acquired and nosocomial infection. Prior colonization with MRSA is a recognized risk factor for MRSA infection. The study aimed to assess the prevalence of and risk factors for MRSA colonization at admission to surgical, medical and orthopaedic wards of Teaching Hospital, Karapitiya, Sri Lanka. From September 2016 to March 2017, consecutive patients admitted to orthopaedic wards and every fifth patient admitted to medical and general surgical wards were enrolled. A nasal swab was collected from the anterior nares within 24 hours of admission and tested using standard microbiologic procedures. Clinical and demographic data were collected. A total of 502 patients were enrolled, including 152 medical, 201 general surgical, and 149 orthopaedic patients. The median age was 45 years (range 3- 85 years) and 58% of patients were male. At admission, 31 (6.2%) were colonized with MRSA. Colonization prevalence was higher in orthopaedic (18, 12.1%) compared to medical (6, 4.0%) and general surgical (7, 3.5%) patients, p=0.002. Patients colonized with MRSA on admission were more likely to be children
       
  • Review article on Calotropis (Wara): Is it a miracle
           shrub or just a plant'

    • Abstract: No abstract available Published on 2018-12-30 00:00:00
       
  • Use of morphometric characters of a fish species to predict its location;
           a statistical approach

    • Abstract: Precise taxonomic identification is the preliminary requirement in a study of an organ- ism/specimen. Correct identification however gives only the identity of the specimen. The value of the correctly identified specimen as a study material becomes low when the habitat/location of its collection is unknown. Knowing the exact place of collection, enables to gather information on the distribution of the organism, possible environmental conditions that the organisms encounter and to describe the variations found in morphological and genetic features of the organism. Present study therefore, aimed on to develop a statistical rule to predict place of collection (river which is unknown) of a given Puntius dorsalis (a freshwater fish species) specimen using its morphometric characters. Fifty-two individuals were collected from four major rivers (Mahaweli, Kelani, Kalu, Nil- wala) in Sri Lanka and 23 morphometric characters were measured from each specimen. Those individuals were categorized into 4 groups according to the river from which they were collected. Measured morphometric characters were used as independent variables of the model to predict unknown group membership (river) of a given Puntius dorsalis specimen. In the case of re-substitution, 82.7% of the Puntius dorsalis specimens were successfully classified or predicted with respect to the place of collection (river) using their posterior probabilities. The process had a hit ratio of 69.2% when generalized, as a valid tool to classify fresh Puntius dorsalis specimen of unknown group membership. It was also discovered that linear classification function could be used to predict unknown place of collection of a fish. The paper concludes with some suggestions to move into nonparametric approach like Classification and Regression Trees (CART) and Neural Networks. Published on 2018-12-30 00:00:00
       
  • Community perception of deforestation and climate change in Ibadan,
           Nigeria

    • Abstract: The studies of urban climate are attracting significant attention in the present dispensation due to the global impacts of climate change, induced mostly by anthropogenic activities. This study examines the community perception of deforestation and climate change in Ibadan, Oyo state. Data for this study were obtained from both primary and secondary sources. A total of 400 questionnaires were administered randomly across the 11 local government areas using purposive sampling technique while 365 were retrieved and analyzed using descriptive statistics. Results obtained revealed that majority of the people (77%) are familiar with the concept of climate change. 39% and 29% of the respondent perceived variability in temperature and rainfall respectively as the major problems confronting climatic parameters which invariably led to climate change. The result further shows that 95% of the respondent agreed that deforestation account mostly for the incidence of climate change. However, the impacts of deforestation on climate change were perceived to be severe (40%) in the study area. Meanwhile, 37% of the respondents believed that afforestation and mix farming is the most suitable solution to address the problem of climate change. The study recommended the use of environment friendly source of energy such as solar vehicle, bio-fuel and promotion of green environment (tree planting) among others to prevent severe impact of climate change. Published on 2018-06-29 07:24:31
       
  • Distribution and abundance of aquatic macrophytes in a forested stream:
           Case study in Kottawa Forest Reserve

    • Abstract: Forest ecosystems have been studied for terrestrial components and other faunal assemblages while information on aquatic plants on this regard is scared. Thus, present preliminary study was designed to study the abundance, distribution and factors influencing on aquatic plant distribution in forested stream selecting “Gong Gawwa Ela” locate in the Kottawa forest reserve. Six sites were selected along a stretch of the stream (~1 km). Those sites were visited once in every month for a period of three months. For each site, plant distribution was observed in a transect across the stream perpendicular to the river bank. Water quality, water flow velocity and sediment composition at each site were also monitored. Eleven aquatic plant species were found along the stream while the most common species were Lagenandra thwaitesii, Aponogeton rigidifolius and Adiantum sp. A significant difference in plant diversity among study sites was noticed where the highest plant diversity was found in the most downstream site. Irrespective to the species; distribution of above three species exhibited a significant positive correlation to the sediment composition. Further, diversity of aquatic plant was significantly correlated to the abundance of L. thawaitsii. There was no significant difference in dissolved oxygen, pH, temperature and biological oxygen demand among study sites. Present study revealed that sediment composition and the abundance of L. thawaitsii are two factors that decide the architecture of the aquatic plant communities along this stream. Published on 2018-06-29 06:18:19
       
  • Illegal gold mining, land degradation and food security in nigeria: a case
           of yauri, kebbi state, Nigeria

    • Abstract: Illegal gold mining and land degradation can affect food production negatively. This study examines the impacts of illegal/surface gold mining and land degradation on food security in Yauri, Kebbi State, Nigeria. Data for this study were collected from both primary and secondary sources. A total of 250 copies of questionnaire were administered to the respondents in the study area using systematic random sampling technique. Descriptive statistics such as simple percentages, graph and frequency among others were used to analyze the data. Result revealed that majority of the respondents (97.1%) and (98.4%) used farmland as their mining site and excavated soil and tailings were dumped on the farmland respectively. The result further showed that more than 96% of the respondents abandoned farming activities for illegal gold mining. This finding indicates loss of farm labour which may result to food insecurity in the study area. The study calls for constitutional provision that will empower states to control and extract whatever minerals deposited within their domain for the overall economic benefit of the citizenry. Published on 2018-06-29 06:18:04
       
  • Study on caviar substitute production using readily available freshwater
           fish species: Cirrhinus mrigala (Hamilton, 1822)

    • Abstract: Fish egg is considered as one of the by-products with low demand at present, therefore adding value is important to increase the demand of fish roe in the fishery sector in Sri Lanka. Mrigal (Cirrhinus mrigala) which is a commercially important freshwater fish species in inland fishery sector was selected as the resource fish species for the present study. Key objective of the current study was to identify the most suitable methodology for production of simulated caviar using Mrigal roe. Mrigal fish egg samples were subjected to dry-salting technique. Three ratios of salt: fish eggs were used as 0.05:1 (S1), 0.25:1(S2) and 0.45:1(S3) to determine the best ratio. Proximate composition evaluation, sensory assessment, microbiological tests and pH analysis were carried out to identify the most suitable roe processing method. Protein level of S1 and Lipid content of S3 sample were significantly different from other two samples (p<0.05). Highest protein percentage was reported from caviar produced by the S2 treatment (6.58 %), although maximum crude lipid level was recorded from the product of the S1 treatment (11.30 %). Moreover, moisture contents of three samples were statistically different when compared with each other. pH values of three products changed significantly within the period of 28 days of storage time (p<0.05). After evaluation of four sensory parameters (Overall consumer preference, Mouth feel, Odor, and Salty taste) highest consumer acceptance was received for the outcome of the S2 treatment. Finally, as the caviar produced by theS2 treatment preserves the highest protein value in the final product, moderate salt requirement and the best sensory qualities, it could be considered 0.25g of salt: 1g of fish eggs is the most appropriate treatment to process simulated caviar by Mirigal fish roe, among all three treatments. Published on 2018-06-29 00:00:00
       
  • Influence of Stream Characteristics on Diversity and Distribution of
           Benthic Algae in Gongawwa Ela in Kottawa Rain forest, Galle, Sri Lanka

    • Abstract: Influence of stream characteristics on diversity and distribution of benthic algae were studied at Gongawwa Ela during the period of September to November in 2016. Four sampling sites were selected and the distance between two sampling sites was 1.5km. Substrate types were categorized by sieve analysis and grain size distribution curves. Principle Component Analysis (PCA) was performed to identify the most important stream characteristics that could potentially influence on the growth of benthic algae. Physicochemical characteristics of water (nitrate, Total Dissolved Solids, temperature, pH, and Dissolved Oxygen) and substrates (pH, phosphate and nitrate) showed significant temporal variations. Conductivity and water velocity levels of the substrate varied significantly among the sampling sites. Species richness of benthic algae (29 genera) showed significantly negative correlations with the level of phosphate content (R2=-0.9592, P<0.05) and pH levels (R2=-0.999, P<0.05) of the substrate. Well graded substrate was observed only at the most downstream site (site 3) while other sites showed poorly graded substratum consisting over 90% of sand. The most abundant algal division was Bacillariophyta and the abundance of Flagilaria sp., Pinnularia sp., Stigeoclonium sp., and Pediastrum sp. showed significant temporal variation. Pinnularia sp., Synedra sp., Anabaena sp. and Navicula sp. were possible indicators of the upstream characteristics. Meanwhile, Cosmarium sp., Pinnularia sp., Surirella sp., Tabellaria sp., Synedra sp., Closterium sp. and Navicula sp. were possible indicators of the downstream characteristics. The PCA showed that the most important stream characteristics were DO, conductivity, Total Suspended Solids, water pH, nitrate in water and water discharge, while conductivity, nitrate, phosphate, % organic matter, pH, and % canopy cover were the types of substrate characteristics. Published on 2018-06-29 00:00:00
       
  • Survival time data and their first statistical analysis: Review

    • Abstract: In the life testing, medical follow-up studies, and other fields, it is often impossible to observe the lifetimes of all experimental units in the study. These types of data are called survival data. Because of the nature of the data, we cannot obtain the full information of the survival data. Therefore, it is not possible to apply the standard statistical techniques to analysis such survival data. In this paper, I mainly focus onright censoring data and explain how to derive the basic nonparametric estimators of cumulative distribution (Kaplan-Meier estimator), hazard, and cumulative hazard function using observed data. In addition to that I discuss how to compare the survival probabilities in two or more groups by using log-rank test. I also introduce the proportional hazard model (Cox’s model) to incorporate the other related covariates to the experiment. Finally, I present some simulation study and real data application. Published on 2018-06-29 00:00:00
       
 
 
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