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article

Environmental considerations on maritime passenger transport

Alberto Camarero Orive, González-Cancelas Nicoleta, Beatriz Molina Serrano, Alfonso Camarero Orive

World Scientific News > 2021 > 151 > 31-44

Maritime passenger transport entails significant risks and threats against the environment. The existing International rules – from the MARPOL 73/78 Convention to the European Regulations and Directives and ISO standards- aim to avoid pollution both in the high seas and in the ports. Concepts such as Green port or Smart port arise from an effort to make better use of the available resources, increasing...

article

Generalizations of Regular Closed Set

Mabrouka Mohammed Almarghani, Khadiga Ali Arwini

World Scientific News > 2021 > 152 > 55-68

In this article, we introduce several types of generalized regular closed sets in topological spaces, using the concepts of v-sets, the class of generalizations contains the sets; regular v-sets, generalized regular v-sets, generalized star v-set and generalized star regular ᴠ-set. We illustrate the inter-relations between these sets, then we study the characterization of this class, which relative...

article

Chemical and Biological Profiling of the N-Hexane Extract of Crude Honeybee Residue

Edet O. Odokwo, Rukayat A. Salawu

World Scientific News > 2021 > 152 > 69-81

The chemical and biological profiling of the n-hexane extract, TM of crude honeybee residue, CHR has been investigated. TM was obtained from crude honeybee by selective separation technique, soxhlet’s extraction, concentrated by simple distillation and dried under vacuum. The extract was profiled for its chemical characteristics: thin layer chromatography, TLC, Fourier Transform- Infra Red, FT-IR...

article

Suitability Study for Tourism Sites in the Southern Coast of West Java

Fajri Ramdhani, Liyantono Liyantono, Gatot Pramono, Ibnu Faizal

World News of Natural Sciences > 2021 > 34 > 127-143

Diversity of tourist attraction of the regencies/cities in West Java provides an alternative for travellers. One of the potential activity that can be utilized is coastal tourism. The main objective of this research was to provide a suitable site for tourism sites which can be used as a guide for government, private and planners to decide for the development of coastal tourism. Furthermore, visitors...

article

Early utilization of Spirulina platensis cultivation as an antioxidant candidate in laboratory-scale closed reactor system

Dewi Oktaviani, Asep Hasan Basri, Windi Damayanti

World News of Natural Sciences > 2021 > 34 > 144-153

Spirulina platensis is a microalga that contains a lot of secondary metabolites and is utilized as a dietary supplement. It can inhibit fat peroxidation better compared to the chemical antioxidant. Laboratory-scale closed reactor system was designed for Spirulina cultivation. This research aims to analyze identified secondary metabolite (Phytochemical contents) and the antioxidant activity or value...

article

A Study on Cultivation of Indigenous Mushrooms in South Eastern Nigeria

R. N. Okigbo, R. O. Ezebo, C. M. Nwatu, J. N. Omumuabuike, more

World News of Natural Sciences > 2021 > 34 > 154-164

Studies were carried out to investigate cultivation of some indigenous edible mushrooms in Anambra State. The most suitable substrates for cultivation of Pleurotus tuberregium and Volvariella volvacea were also investigated. Spawn of V. volvacea was obtained from the Department of Life Science, University of Benin, Edo State and sclerotia of P. Tuberregium purchased from Eke Awka Market, Anambra State...

article

Diseases prevalence of Acropora corals: Study on Semak Daun Island, Seribu Islands, Jakarta

Syawaludin A. Harahap, Farid Fadhil, Sunarto Sunarto

World News of Natural Sciences > 2021 > 34 > 113-126

Coral reefs have undergone significant degradation as a result of the impact of human disturbance and natural factors on biodiversity and ecosystem function. The impacts ranged from an increase in the appearance of coral bleaching, coral disease, to coral death. Especially for coral disease, it is confirmed that it has contributed to the reduction of live coral cover and the productivity of coral...

article

Splitting 4D spacetime into 3D space and 1D time involves operationally needed presence of two 3D spaces enclosed inside two 4D paired dual reciprocal spatial structures

Jakub Czajko

World Scientific News > 2021 > 152 > 82-110

The anticipated separation of the 4D spacetime into 3D length-based space and distinct abstract 1D space of elapsing time, which would vary independently of the usual variables of the length-based space, is not reasonable in the formerly unspoken single space reality (SSR) framework, because the separation would lead to inadmissible identification of multiplicatively inverse/reciprocal derivative...

article

Axioms of Countability Via Preopen Sets

Nagah A. Elbhilil, Khadiga Ali Arwini

World Scientific News > 2021 > 152 > 111-125

We used the concept of preopen sets to introduce a particular form of the μ-countability axioms; namely pre-countability axioms, this class of axioms includes; pre-separable spaces, pre-first countable spaces and pre-second countable spaces. In this article, we study the topological properties of these spaces, as the hereditary property and their images by some particular functions; moreover we investigate...

article

The Time at the Level of a High Speed Moving Object

John Spacey

World Scientific News > 2021 > 153 > 1 > 1-42

I think that far-away travels into Space are possible in the way that it is possible to find again people on our Earth, after the return of a very long travel into Space, not aged, like the people who have traveled inside the spacecraft. Current physics does not allow this and I have developed the following Theory which would thus complement the current Theory of General Relativity when we go to the...

article

Fractional Integral Approximation and Caputo Derivatives with Modification of Trapezoidal Rule

Naomi Pandiangan, Dwindi Johar, Sri Purwani

World Scientific News > 2021 > 153 > 2 > 169-180

In classical calculus, a function can be derived or integrated as many as natural numbers. Then a question arises regarding the fractional order of derivatives and integrals. There is a development of classical calculus called fractional calculus. Fractional calculus may be a department of science that amplifies the orders of derivatives and integrals into the order of rational numbers or even real...

article

Notes on the presence of Phrynarachne ceylonica (O. Pickard-Cambridge, 1884) from the Andaman and Nicobar Islands

Minakshi Dash, C. Sivaperuman

World News of Natural Sciences > 2021 > 35 > 48-55

Description of Phrynarachne ceylonica (O. Pickard-Cambridge, 1884) female from Andaman and Nicobar islands after a long gap of 124 years has been provided through the collections of fresh specimen in and around these islands. The selection of habitat and the range expansion are discussed. The distribution records of the species are mapped.

article

Efficiency and Convergence of Bisection, Secant, and Newton Raphson Methods in Estimating Implied Volatility

Mahrudinda Mahrudinda, Devi Munandar, Sri Purwani

World Scientific News > 2021 > 153 > 2 > 157-168

This study aims to estimate volatility prices based on the black-Scholes model (BSM) function with research data taken during the COVID-19 pandemic. The estimates of the volatility values are obtained by using three numerical methods, namely the bisection, secant, and Newton Raphson methods. The numerical processes that produce some iteration results in the three methods are then analyzed and the...

article

A Susceptible-Infected-Removed Epidemiological Model for COVID-19 Spreading in Indonesia

Audi Luqmanul Hakim Achmad, Mahrudinda Mahrudinda, Sri Purwani

World Scientific News > 2021 > 153 > 2 > 55-64

COVID-19 is a disease emerged from China in the late 2019 and still spreading to this date. Scientists worldwide are trying to give their contributions in many aspects, from searching for the vaccine to studying several policies in many aspects to deal with this disease. One of the important researches in COVID-19 is to study and predict the dynamic of the spreading by using epidemiological model...

article

New type of fuzzy ideals in BCK/BCI algebras

V. S. Subha, P. Dhanalakshmi

World Scientific News > 2021 > 153 > 2 > 80-92

In this paper, we expose pythagorean fuzzy sets in BCK-algebras. Also we define pythagorean fuzzy subalgebra, pythagorean fuzzy ideal in BCK-algebra and investigate some properties of these ideals. Some interesting examples are given. Homomorphism of pythagorean fuzzy set in BCK-algebras are introduce. Moreover we combine the pythagorean fuzzy set and rough sets in BCK-algebras. The concept of rough...

article

Analysis of Several Water Environment Parameters Affecting the Accumulation of Heavy Metal Lead in the Body of Blood Shells in the Coastal Waters of Muara Gembong Sub-District

Achmad Rizal, Izza Mahdiana Apriliani, Rega permana

World Scientific News > 2021 > 153 > 2 > 65-79

The research objectives are: 1) to analyze several parameters of the aquatic environment that affect the lead accumulation in shellfish body (Anadara granosa (Linnaeus, 1758)) at eastern coastal waters of Muara Gembong sub-district by using multiple regression analysis, 2) to reduce the variables through principal component analysis to reduce the research cost for monitoring of lead pollution in the...

article

Synthesis and antimicrobial activity of 5-(2’-n-butyl-4’-chloro-1’-H-imidazol-5’-yl)-3-aryl-4,5-dihydro-{1-H/1-acetyl/1-phenyl}-pyrazoles

A. K. Joshi, D. M. Purohit

World News of Natural Sciences > 2021 > 35 > 38-47

5-(2’-n-butyl-4’-chloro 1’-H-imidazol- 5’-yl)-3-aryl-4, 5-dihydro-1-H-pyrazoles. (2a-2j); 1-[5’-(2”-n-butyl-4”- chloro-1”-H-imidazol-5”-yl)-3’-Aryl-4’, 5’-dihydro-1’-H-pyrazol-1-yl]-ethanones. (3a-3j); 5-(2’-n-butyl-4’-chloro-1’-H-imidazol-5’-yl)-3-Aryl-1-phenyl-4, 5-dihydro-1-H-pyrazoles. (4a-4j) have been synthesized. The products have been assayed for their antimicrobial activity against Gram +ve...

article

Comparative study of the properties of yellow and brown Cyperus esculentus L.

Stanley Chukwuemeka Ihenetu, Francis Chizoruo Ibe, Prisca Chigozie Inyamah

World News of Natural Sciences > 2021 > 35 > 25-37

The present research accounts for the physicochemical and phytochemical characteristics of yellow and brown Cyperus esculentus, which were subjected to standard chemical and biochemical analysis. The results obtained from the analysis of yellow tiger nut showed the following phytochemical properties: anthocyanin 0.82 ± 0.02 µg/ml, oxalate 1.43 ± 0.05 µg/ml, tannin 12.22 ± 0.10 µg/ml, rutin 39.19 ±...

article

Spatial distribution and trophic structure of bird’s communities of Atlantic Forest fragments in Brazil

Fabio Rossano Dario

World News of Natural Sciences > 2021 > 35 > 1-24

We analyzed the differences in composition, richness, and abundance of birds in forest fragments of the Atlantic Forest in the São Paulo State, Brazil, and we demonstrated the variations in richness and abundance of birds between different trophic guilds. We used point counts to characterize the avifauna. Sampling was conducted in two seasons: summer and winter of 2020 in a total of 18 hours distributed...

article

Pore Water Nutrient Profile in the First and Second Transitional Season in Teluk Ciletuh, Sukabumi District, West Java

Hilmi Miftah Fauzi Efendi, Yuniarti Yuniarti, Mega Laksmini Syamsudin, Yudi Nurul Ihsaan

World Scientific News > 2021 > 153 > 2 > 43-54

The purpose of this research conducted between October 2018 and April 2019 was to determine the effect of the first and second transitional season on the nutrient profile in Ciletuh Bay. The data used in this research and directly taken from the research site were seawater quality parameters, analysis of granulometry sample and analysis of nutrient profile, while all data processing was conducted...

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INFONA - science communication portal

Search results

Environmental considerations on maritime passenger transport

Generalizations of Regular Closed Set

Chemical and Biological Profiling of the N-Hexane Extract of Crude Honeybee Residue

Suitability Study for Tourism Sites in the Southern Coast of West Java

Early utilization of Spirulina platensis cultivation as an antioxidant candidate in laboratory-scale closed reactor system

A Study on Cultivation of Indigenous Mushrooms in South Eastern Nigeria

Diseases prevalence of Acropora corals: Study on Semak Daun Island, Seribu Islands, Jakarta

Splitting 4D spacetime into 3D space and 1D time involves operationally needed presence of two 3D spaces enclosed inside two 4D paired dual reciprocal spatial structures

Axioms of Countability Via Preopen Sets

The Time at the Level of a High Speed Moving Object

Fractional Integral Approximation and Caputo Derivatives with Modification of Trapezoidal Rule

Notes on the presence of Phrynarachne ceylonica (O. Pickard-Cambridge, 1884) from the Andaman and Nicobar Islands

Efficiency and Convergence of Bisection, Secant, and Newton Raphson Methods in Estimating Implied Volatility

A Susceptible-Infected-Removed Epidemiological Model for COVID-19 Spreading in Indonesia

New type of fuzzy ideals in BCK/BCI algebras

Analysis of Several Water Environment Parameters Affecting the Accumulation of Heavy Metal Lead in the Body of Blood Shells in the Coastal Waters of Muara Gembong Sub-District

Synthesis and antimicrobial activity of 5-(2’-n-butyl-4’-chloro-1’-H-imidazol-5’-yl)-3-aryl-4,5-dihydro-{1-H/1-acetyl/1-phenyl}-pyrazoles

Comparative study of the properties of yellow and brown Cyperus esculentus L.

Spatial distribution and trophic structure of bird’s communities of Atlantic Forest fragments in Brazil

Pore Water Nutrient Profile in the First and Second Transitional Season in Teluk Ciletuh, Sukabumi District, West Java

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