Open Access Short Research Article

Acceleration Response Analysis of a Steel-wood Composite Floor System under Human-induced Vibration

Dong Yujian, Cao Lilin

Journal of Scientific Research and Reports, Page 60-71
DOI: 10.9734/jsrr/2021/v27i430379

To investigate the vibration response of a steel-wood composite floor system under walking and jump excitation. The ABAQUS subroutine Vdload is used to simulate the human walking and jumping process on the structure, while the human-induced excitation is equated to a combination of a Fourier-scale load model and a biomechanical model of mass, stiffness, and damping (MSD) to study the human-induced vibration response under human-structure interaction (HSI). The effects of walking and jumping excitation on the peak acceleration of the structure are also considered. The results show that the peak acceleration of the structure considering the human-structure interaction is significantly smaller than that without the human-structure interaction, and the results obtained from the numerical simulation analysis are more consistent with the experimental situation. In addition, the acceleration response of the steel-wood composite floor system under jump excitation is larger than that of walking excitation, and the peak acceleration increases with the increase of jump frequency. Then: any floor, no matter its structural configuration and material, is prone to vibrate under walking and jumpimg excitation if the excitation frequency is in resonance with one of its main frequencies. The induced vibrations affect the floor serviceability, when the induced peak acceleration exceeds the comfort requirements. The magnitude of the induced peak acceleration is the larger, the larger the acting force and the lower the vibrating floor mass and its damping.

Open Access Short communication

Environmental and Economic Recovery Post-Fukushima Daiichi Nuclear Disaster: Isotope Characteristics and the Recovery of a Crippled Fisheries Industry

Peter W. Wilson, Tanya L. Park, Beatrice Harrison-Day, Davis Hinton, Laura Nilssen, Matthew Rose, Stuart Isles

Journal of Scientific Research and Reports, Page 53-59
DOI: 10.9734/jsrr/2021/v27i430378

The 2011 Tohoku earthquake and subsequent tsunami had a catastrophic effect on the aquaculture industry of the North-East Japanese coast. Ten years on, this paper examines the environmental and economic impacts of this disaster within the context of the Fukushima nuclear meltdown. Following structural damage to the Tokyo Electric Power Company Fukushima Daiichi plant, fisheries and aquaculture industries were suspended, given the initially high radio caesium output into the coastal water column. Daily radiation testing began on all fisheries products, with tentative industry resuming within the Fukushima prefecture once radiation had dropped below the 50 Bq/kg, as stipulated by the Fukushima Fisheries Association. Routine testing continues biweekly (at least until March 2021). As of May 2016, 73 fish species were passed for consumption. The rapid functional recovery of the fisheries industry has been mediated by two factors, the sedimentation characteristics of the caesium isotopes and deposition of isotopes out to sea in an Easterly direction, given the interaction of oceanic currents. While the aquaculture industry may have recovered and food reduced to safe radiation levels, the disaster continues to exert a domestic and international economic impact given the stigma of Fukushima radiation.

Open Access Original Research Article

Probabilistic Human Health Risk Assessment of Fe, As and Mn in the Groundwater of Dhamrai Upazila, Dhaka, Bangladesh

Sharmin Akter, Partha Pratim Brahma, Atkeeya Tasneem, Md. Khabir Uddin

Journal of Scientific Research and Reports, Page 1-11
DOI: 10.9734/jsrr/2021/v27i430374

In Bangladesh, groundwater is the most important source of potable water. This study aims to investigate the amount of Fe, Mn and As in groundwater and to assess the health risks through oral ingestion of these trace metals. Groundwater samples were collected from 20 sample sites throughout the Baishakanda union, Dhamrai upazila for source appointment and risk assessment studies. The concentrations of Fe, Mn, and As were measured using an atomic absorption spectrophotometer. Mean concentration of trace metal level in respectively descending order as Fe>Mn>As. The study found an average concentration of Fe (1.8 mg/L), Mn (0.74mg/L), and As (0.038 mg/L) in the groundwater sample where the mean value of Fe and Mn exceeds the DoE, WHO, and USEPA standards limit. On the other hand, the mean concentration value of As exceeds the WHO and USEPA standards limit. The non-carcinogenic human health risk was calculated by justifying HQ (Hazard Quotient) and HI (Hazard Index).A child (11.4056) is more vulnerable to non-carcinogenic human health risk than an adult (5.3769). Furthermore, As pollution in groundwater samples was found to pose a high carcinogenic risk, with children (3.84×10-3) being more vulnerable to carcinogenic risk than adults (1.81×10-3).The research area's groundwater was with a significant level of non-carcinogenic as well as cancer-risk (As) susceptibility in the local population.

Open Access Original Research Article

Customer Value Co-creation Intention, Practices, Co-destruction and Experience in Self Service Technologies

Badra Sandamali Galdolage

Journal of Scientific Research and Reports, Page 12-26
DOI: 10.9734/jsrr/2021/v27i430375

Many service encounters are moving from traditional physical interfaces to technologically incorporated self-service options. However, it is surprising that very limited extant literature is devoted to understanding the movement towards self-service technologies. Therefore, this study aims at understanding customer value co-creation intention, practices including both the value co-creation and co-destruction and their co-creation experiences in self-service technology context. Based on the positivistic approach, a quantitative study carried out distributing self-administered questionnaires to 600 individuals chosen based on a non-probabilistic convenience sampling method. Study found that customer value co-creation intention has significant positive effects on customer value co-creation practices and significant negative effects on customer value co-destruction in SSTs. Value co-creation practices show a strong positive effect on customer functional experiences and ‘positive emotional experiences’ while having a negative effect on ‘negative emotional experiences. In contrast, co-destruction shows inverse relationships. This study assists practitioners to understand why customers collaborate with SSTs, what they do in co-creating value and how this links with their experience. Service providers can use this understanding to facilitate customer co-creation by securing positive customer experiences and achieving competitive advantage by designing and delivering value enhancing self-service technological interfaces from both strategic and operational perspectives.

Open Access Original Research Article

Adsorption of Crude Oil Spill from Aqueous Solution using Agro-Wastes as Adsorbents

Akinsete O. Oluwatoyin, Araoye A. Olalekan

Journal of Scientific Research and Reports, Page 27-52
DOI: 10.9734/jsrr/2021/v27i430376

Ever increasing and growing awareness of oil-spillage to water environment has led to the search for cost-effective unconventional remediating techniques. This study was carried out using agro-wastes (Rice Husks, Banana Peels and Groundnut Husks) adsorbents. They were activated with H3PO4 for crude oil spill removal from aqueous solution; results were analysed using atomic absorption spectroscopy. The raw agro-wastes and their activated forms were characterized by SEM. The sorption study for maximum adsorption capacity were carried out at different adsorbent concentrations, adsorbent dosage, contact time, pH and rotational speed. The experimental results were analysed using Langmuir, Freundlich, Temkin, Dubinin-Radushkevich isotherm models. The maximum average adsorption capacity (qe) for raw and activated carbon adsorbents were observed in rice husks with 0.2750 and 0.3698 mg/g respectively. The Langmuir isotherm was found to well represent the measured sorption data for the raw and activated banana peel while the remaining raw and activated adsorbents followed the Temkin isotherm. The batch adsorption data on the effect of contact time were fitted into the pseudo-first-order and pseudo-second order models. The banana peel data and its activated form were best described by the pseudo-second-order model indicating chemisorption process while the remaining adsorbents followed the pseudo-first-order model indicating physisorption process. The average removal efficiency of oil by the various adsorbents used increase in the order: (Raw: Banana Peels (50.4 %) < Groundnut Husks (56.8 %) < Rice Husks (74.4 %); Activated Carbon: Banana Peels (61.4 %) < Groundnut Husks (65.6 %) < Rice Husks (82.8 %)). Results of this study (high values of R2 and least values AARE and RMSE) revealed and confirmed that activated carbon adsorbents have better adsorption capacity than the raw forms to clean-up oil spills in aqueous solution.

Open Access Original Research Article

Nasopharyngeal Samples Management Strategy During the COVID-19 Pandemic: Experience of the Pasteur Institute of Côte d'Ivoire (2020)

Danielle Kpadraux Odegue, Guedé Kipré Bertin, Diane Kouao Maxime, Kolia Kouamé Innocent, Sina-Kouamé Sylvie Mireille, Obro Koby Albert, Kouassi Kan Stéphane, Yepri Banga Victor, Kakou N’gazoa Solange, Aoussi Serge, Dosso Mireille

Journal of Scientific Research and Reports, Page 72-79
DOI: 10.9734/jsrr/2021/v27i430380

Medical testing laboratories are an essential link in the efficient management of infectious diseases by the identification of the pathogens involved. However, the arrangements for their operation may appear more difficult in times of health crises and raise multiple issues that may compromise the usual level of quality assurance of biological analyses and the response to needs. The smooth running and control of laboratory activities in a health crisis situation requires the implementation of a management system that allows the federation of all available energies. We report here on the experience of the Pasteur Institute of Côte d'Ivoire, in charge of nasopharyngeal samples management during the COVID 19 pandemic, describing the assessment of pre-analytical activities in the first quarter of the crisis (March to May 2020). We then present the implemented strategy and the results obtained from June to September 2020. This article proposes a framework for sharing experiences to contribute to a better preparation of the pre-analytical phase of laboratory samples during health crises.

Open Access Original Research Article

Robust Compensating Function Scheme for Adequate Electrical Power System Stabilization

Michael Macmammah, J. Atuchukwu, C. I. Obinwa, Chukwudi E. Agbaraji

Journal of Scientific Research and Reports, Page 80-91
DOI: 10.9734/jsrr/2021/v27i430381

This work centers on robust compensating function scheme for adequate electrical power system stabilization. There has been high level of disturbances in the power line and lack of adequate compensation technique to cancel the effects of the resultant instability which has caused power failures. The problem was addressed by the consideration of disturbances in the power line during the design of the compensating function for the improvement of the power system performance and stability. H-Infinity synthesis robust compensating function design method was used to design an adequate compensator that can improve the performance and stability of the power system.  From the results, the H-infinity Synthesis Controlled Generating Plant (HCGP) recorded an overshoot of 0%, settling time of 1.04 seconds, tracking error of 0dB, gain margin of 21.7dB and phase margin of 79.6 degrees. The simulation was repeated by varying the value to k to -0.3, and the generating plant produced same results. This shows that the system can maintain performance and stability equilibrium even when there is change in its parameters. Since the HCGP satisfied the performance and stability robustness, therefore it was concluded that power system robust compensating function scheme for improved performance and stability robustness was achieved using H-Infinity synthesis method.

Open Access Original Research Article

Study of Heavy Metals Bio Toxicity Present in Locally Produced Palm Kernel Oil in Osun State, Nigeria

Oluwadamilola Ayoola Ajibade, Pascal Tchokossa, Taye Victoria Oluwasusi, Michael Oluwasanmi Adeleye, Funmilayo Joke Okparaocha

Journal of Scientific Research and Reports, Page 104-113
DOI: 10.9734/jsrr/2021/v27i430383

This study investigates the heavy metals content presents in locally produced Palm Kernel Oil in Osun State, Nigeria. 16 samples were collected from four major factories in four towns in the study area.  Atomic Absorption Spectrometry (AAS) was used for the concentration of the heavy metals analysis in the samples. The results show the contents of the heavy metal present were 0.022, 0.018, 0.090, 0.071, 0.166 and 0.010 ppm for Cd, As, Fe, Zn, Cu and Pb, respectively. The range of measured concentration of heavy metal contents in the palm kernel oil varies within the same factory which may be due to the fact that the production processes and most especially the source of the palm kernel used by the factories and nature of the soil where the palm tree is planted varied. The mean concentration of Cd, Zn, As, Fe and Pb were below the bio-recommended limit published by joint FAO/WHO. Only Cu is well above the permissible limit.

Open Access Original Research Article

Impact of Stocking Density as the Growth and Biomass Production of Hybrid Tilapia (Red Strain) in Cages

Alish Debbarma, Stephen Sampath Kumar, J. V. Senthil Kumar, Anupam Tripura

Journal of Scientific Research and Reports, Page 114-123
DOI: 10.9734/jsrr/2021/v27i430384

The study was conducted to evaluate the effect of stocking density influencing the growth of Hybrid Tilapia (Red strain) in cages for culture period of 120 days. The experiment is conducted in Thanjavur Center for sustainable Aquaculture, Sorrokottai, Tamil Nadu, India. Hybrid Tilapia fingerling ABW of (3.3+0.01 g) were stocked at 20/m3 (T1), 30/m3 (T2) and 40/m3 (T3) and fed 3 times daily (9:00, 12:00 and 17:00 H) with a commercial food 40% protein gradually reduce to 35 to 30% protein and stock was sampled fortnight. Among three stocking densities, 20 fish/m3 was found to be the best for the growth in cages, while the FCR and net biomass production were found higher in high stocking densities fishes (30, 40 fish/m3). The best FCR was 1.08 +0.06 from T1 (20 fish/m3) with 92.5+0.04% of FCE. The highest net biomass production was 19 kg (3.16 kg/m3) from T2 (30 fish/m3). Present study reveal that stocking density has negative effect on bio-growth parameters but biomass production has positive effect with stocking density.

Open Access Review Article

Probiotics: Food Supplement for Human Consumption

Shipra Jha, Renu Yadav

Journal of Scientific Research and Reports, Page 92-103
DOI: 10.9734/jsrr/2021/v27i430382

The human gut microflora contains 1000 of dynamic microbial ecosystem to maintain balance between immune boosting and harmful bacteria. The good bacteria reside in healthy human gut and responsible for increasing energy production, inhibiting pathogenic growth. In unhealthy gut microbiota initiates the development of disorders in human body include metabolic disorder, chronic diarrhea, obesity. The article deals with the study of emerging trends in probiotics and developing industrial probiotics products for human body. At present there are many probiotics foodstuff isolated by industries from natural foods includes vegetables, grain, cereals to use in the form of nutrient supplements. Human Gut can be enriched with natural, low cost Probiotic supplements to improve lifestyle.