bluuebunny/crossref_metadata_2025 huggingface dataset:
Rheological and viscoelastic properties of collagens and their role in bioprinting by micro-extrusion
Authors: Lan Xiaoyi , Adesida Adetola , Boluk Yaman
Published: October 2022

This article aims to understand the rheology of collagen networks and their role in various stages of a bioprinting process while building tissue-like constructs. The science of rheology, which deals with the deformation and flow of matter, has grown considerably from its earlier focus on polymer melts and solutions and their processing methods to hydrogels with new processing procedures, such as bioprinting. The main objective of this paper is to discuss the impact of the rheology of collagen hydrogels on micro-extrusion and layer-stacking stages of bioprinting. Generally, the rheological characterization of hydrogels, including collagens by dynamic measurements under small deformations, is considered sufficient to evaluate their bioprinting performance. However, we brought out the importance of other rheological properties of collagen networks, such as steady-state shear flow conditions and large amplitude oscillator shear. While the dynamic measurements under small deformations help characterize the crosslinking and gel formations of the collagen, the steady shear flow measurements are better tools for investigating filament micro-extrusion and layer-stacking stages of a bioprinting process. We brought the role of other non-Newtonian material functions, such as first normal stress difference and extensional viscosity in addition to shear viscosity, for the first time. Extensional viscosity and the viscoelasticity manifested through normal-stress differences are significant in capillary (needle) flow. We also suggested caution to use dynamic viscosity vs. oscillation frequency under small deformations in place of steady shear viscosity vs. shear rate measurement. In addition, we brought out the importance of the large amplitude oscillatory shear test to investigate the collagen networks under large deformations. Finally, we discussed the role of crosslinking and flow conditions on cell viability. Those discussions are focused on collagen networks; nevertheless, they are valid on the bioprinting of other hydrogels.
Hydrological response of the Assif Melloul basin in the Central High Atlas (Morocco): Monitoring and Creating a rating curve.
Authors: Goumih M , El Ghachi M , Ouakhir H , Ennaji N , Midaoui A
Published: October 2022

Dynamic of landscapes related to climate change and modification of land uses are the crucial elements that controlling hydrological responses within basins. Besides, in the Mediterranean areas, most of the authors indicate the role played by dynamic and change of land cover, and climate characteristics for determining and generating the hydrological processes and the resulting alterations of the surface at spatial and temporal scales and subsurface flow patterns. The purpose of this article is to compare the dynamic of both rating curves in order to extract the discharge for understanding the response and hydrological behaviour of the two selected headwaters (i.e., area = Kousser 311.09 km2 and Annergui 69.81 km2), which are situated within middle part of high Atlas Mountains (Morocco) at central part of Assif Melloul River basin. The dynamic of rainfall, and land cover dynamics were been considered in order to extract their observed changes in discharge at the studied headwaters. Besides, the estimation of the discharge in the outlet of both catchments is based on monitoring of the water level by limnimeter. The value of the obtained discharge is extracted by the rating curve method. The obtained results show a clear seasonality of the Assif Melloul basin, which is characterized by variability of the hydrological regime with high inter-annual in space and time. The maximum water level-discharge value at the two catchments is recorded during wet periods (19 m3/s-1 at Annergui and 1m3/s-1 at Kousser catchments), while the minimum level is registered during dry seasons (0.46 m3/s1 and 0.21 m3/s-1). Consequently, this presented work will be a good investigation for managers to decrease the future impacts and risks related to flash flood events at catchment scale.
Pastoral pressure and degradation of forest and peri-forest rangelands in the central Middle Atlas: case of the Tigrigra watershed (Morocco)
Authors: Achiban H , Taous A , Achiban H , El-Khantoury I , Abba E. H , Addou R
Published: October 2022

Although the forest ecosystems of the western region of the central Middle Atlas have a significant fodder potential and a particular richness in terms of biodiversity. They are currently subject to a regressive dynamic under the influence of overgrazing. This study allows to draw up a qualitative and quantitative assessment of the pastoral pressure on the natural ecosystems of the Tigrigra watershed. This is a territory where climatic changes and social mutations (stability of herders and cultivation of land formerly reserved for grazing), combined with the increase in the number of herds, have led to the dependence of livestock feeding on forest fodder resources. Indeed, grazing practices in the study area are based on traditional concepts of extensive livestock rearing and misuse of pastoral resources, which leads to significant dysfunctions between pastoral supply and demand, and consequently to the degradation of natural ecosystems.
A Framework Payment for ecosystem services to reconstitute forest areas closed to grazing in the Ifrane National Park (Morocco).
Authors: Ismaili Alaoui H , El Asri B , Ghazi S , Brhadda N , Ziri R
Published: October 2022

Overgrazing constitutes the major constraint threatening the sustainability of the forest ecosystems in the Ifrane National Park. The operations of regeneration and afforestation impose to close areas to grazing over one period exceeding ten years, generally lead to the opposition of the local population to the programs of reconstitution of the forest ecosystems. To solve these problems, a text of compensation for closed perimeters of afforestation or regeneration to the grazing was established in 2002. The main aim of this study is to evaluate the role of the compensation mechanism described as a payment tool for forest ecosystem restoration programs. For this purpose, an analysis of quantitative and qualitative indicators, based on individual and semi-structure interviews, before and after the introduction of the compensation mechanism is used. The GIS mapping approach is also used to visualize some results spatially. Based on results, this mechanism contributed to conserving the forest ecosystem and enhancing rural livelihoods at the level of Ifrane National Park, resulting in the regression of the forest infractions with a rate of 48%. On the socio-economic level, this mechanism contributed to initiate a climate of trust resulting in the collaboration of the population with the foresters and, to carry out many projects of community interest generated socio-economic benefits relevant for the users.
Water quality cartography of the upstream part of the Oum Er Rabia hydraulic basin (Morocco)
Authors: Boumalkha O , Hachi T , Chorfi H , Essabiri H , El Hammioui Y , Laiboud C , Abba E H
Published: October 2022

Water resources constitute the basis of human existence; however, they are becoming increasingly scarce under conditions of population increase, economic development, climate change and especially the impact of pollution due to human activities such as the discharge of wastewater without treatment in rivers, lakes … Also, in Morocco, water resources are becoming scarce as in the global what makes this country among the areas under water stress. The main objective of this study is the evaluation of the water quality of the upper part of Oum Er Rabia. The results of bacteriological analyzes from the various stations showed an increase in total coliforms and feacal coliforms downstream of the Khenifra wastewater treatment plant and at the upstream station of the El Hansali dam. Regarding the physicochemical quality, the water of the majority of the controlled stations is of average to poor quality except one station which has a very poor quality according to the Moroccan standard relating to surface water.
The potential role of sediments in nutrients (N, P) cycle in Marchica lagoon (Mediterranean Sea, Morocco)
Authors: Rahhou Abderrahmane , Layachi Mostafa , Akodad Mustapha , El Ouamari Najib , Aknaf Asmae , Gueddari Hicham , Oudra Brahim , Baghour Mourad
Published: October 2022

The aim of this study is to present the distribution of nutrients in water and sediment of Marchica lagoon, a post-restorated lagoon located in Mediterranean Sea (NE Morocco), to estimate the impact of bottom sediments on the water quality of this lagoon, and to identify the areas more affected by eutrophication risk. Nutrient concentrations in the water column and sediments were determined in thirteen samples taken from different station of the lagoon in October 2019. Nutrient concentrations in sediment were found higher than those in surface water; very high levels of nitrogenous elements showed in all sediments samples and mainly nitrogenous components (averages of 43.58 mg of N-NH4; 0.827 mg of N-NO3; 0.054 mg of N-NO2 and 773 mg of TN per kg of dry sediment) and high levels of phosphorus with average of 620 mg P/kg of dry sediment. A strong positive correlation showed between sediment and water parameters in 0.01 and 0.05 levels. High concentrations were recorded near the nutrient-rich wastewater treatment plant effluent discharges, watershed and groundwater input. The lowest concentrations are near the new pass, this is due to the low continental inputs and the renewal of the lagoon waters by the Mediterranean Sea. Generally, the distribution of nutrient levels is influenced by continental inputs, hydrodynamics, and organic matter content in the sediment. These sediments are considered as a reservoir of nutrient pollutants, which will influence water quality by releasing sedimentary materials in the water.
Permian volcanism of the Khenifra Massif (Central Morocco) Petrography and geochemical affinity
Authors: Boutsougame A , Ouazzani H , Abba E H , Alaoui M
Published: October 2022

The Permian volcanic complex of Khenifra (Moroccan Central Hercynian Massif) manifests itself mainly by volcanic rocks of andesite, rhyolite, dacite, rhyodacite, ignimbrite and trachyte nature. These are rocks with a microlitic to porphyritic texture. They are formed by a primary paragenesis made of plagioclase, pyroxene, olivine, feldspar, biotite, amphibole and quartz and a secondary mineral association made of augite, calcite, chlorite and opaque. Intermediate and acidic rocks are widely represented in Khenifra basin. These facies are of calco-alkaline affinity.
Sustainable Sanitation: an appropriate solution in rural areas
Authors: Taouraout A , Chahlaoui A , Sadki M , Maliki A , Khaffou M , Belghyti D
Published: October 2022

In Morocco, reuse of treated wastewater can reduce the negative effects of drought in the agricultural sector. However, it is necessary to adopt a sustainable sanitation in order to reduce the risk of this type of water on public health and environment. This new sanitation concept is based on the principle of separation, recovery and reuse of wastewater and taking in consideration the social, economic, environmental, and institutional of the local conditions. The aim of this article is: to give the main results of a survey conducted in 2017 at Dayet Ifrah village which housed the first pilot ecological sanitation project in Morocco concerning appreciation and attitude of the population towards this new system of sanitation; and on the other hand to study the efficiency of a pilot scale system composed on three filters used to treat domestic wastewater coming from a single house in Meknes. In general, ecological sanitation is appreciated by the population of the village and showed its effectiveness to improve sanitation in Moroccan context. The pilot scale system proved his effectiveness to trait organic pollution and nutrients, faecal pollution and parasites.
Alfalfa in arid and semi-arid regions Taroudant as an example, good and bad cultural practices on the environment: A statistical study
Authors: Moussaoui H E , Ainlhout L F Z , Bourezi A , Bouqbis L
Published: October 2022

A field study was made on the cultivation of alfalfa and their different components of this crop in the Taroudant region in the south of Morocco, the questions of this study based on the cultivation and fertilization methods, irrigation, and finally prospects. This study showed that the majority will continue to cultivate alfalfa her because the use of alfalfa is mainly as fodder food for their own herd, the whole population does the plowing before the crops, the varieties used are mainly from USA. The population uses manure with different quantities, it depends on the cultivated area and on the use of chemical fertilization. This study showed high consumption of water and chemical fertilizers with a means between 44066.8 m3/year/ha is 62399.9 m3/year/ha, and between 165.6 kg/ha/year and 205.7 Kg/ha/year respectively with a 95% confidence interval. What knocks the alarm danger in environmental matters.
Improving the physiological responses and stomatal characteristics of Paspalum vaginatum during the winter season
Authors: Fetjah D , Ainlhout L F Z , Idardare Z , Bouqbis L
Published: October 2022

Drought is a universal problem that affects plant production and degrades soil. The point of this study was to appraise the physiological responses of Paspalum vaginatum to water stress and to attempt to minimize its impacts using organic amendment in arid and semi-arid climates. In winter 2019, a pot investigation was undertaken for this reason in the south of Morocco on a plastic pot filled with sandy loam soil and various levels of peanut hull biochar and compost on 20% of water holding capacity. The results revealed that adding biochar and compost enhanced photosynthesis, stomatal traits, and water availability in plants cultivated in amended treatments compared to untreated treatments. This study could be a prominent reason for managing luxury golf courses in arid zones.
Olive and green tea leaves extract in Pleurotus ostreatus var. florida culture media: Effect on mycelial linear growth rate, diameter and growth induction index
Authors: Werghemmi W , Abou Fayssal S , Mazouz H , Hajjaj H , Hajji L
Published: October 2022

The exponential disposal of agro-industrial wastes onto the environment has endangered all forms of life. The implementation of these wastes in mushroom production is an eco-friendly and promising solution. The effect of olive and tea leaves extracts represented in culture media treatments: potato dextrose agar (PDA) 80% + tea extract (TE) 20% (T2), PDA 80% + olive extract (OE) 20% (T3), PDA 80% + OE 10% + TE 10% (T4), PDA 70% + OE 20% + TE 10% (T5) on mycelial growth diameter (MGD) and linear growth rate (MLGR) of Pleurotus ostreatus var. florida was compared to the one of PDA used as control (T1) at 22, 25 and 28°C inoculation temperatures. Optimum MGD was observed at 28°C in T1 (day 2), while it was significantly increased by 1.1–1.4 folds (days 4, 6, 8) in culture media containing plant extracts nevertheless the inoculation temperature. MLGR was improved by 102%–145% in olive/tea culture media compared to PDA nevertheless the inoculation temperature. Optimum growth induction index (GII) was observed in T3 (22.2%) at 22°C, T5 (21.9%) at 25°C and T4 (18.2%) at 28°C. These findings suggest the combination of olive and tea leaves extracts in the production of Pleurotus ostreatus.
Chemical composition, Antibacterial and Antioxidant Activities of the Essential Oil of Lavandula Pedunculata from Khenifra Morocco
Authors: Chroho M , El Karkouri J , Hadi N , Elmoumen B , Zair T , Bouissane L
Published: October 2022

Essential oils (EO) extracted from medicinal and aromatic plants (MAP) have proven to be good sources of bioactive compounds with antibacterial and antioxidant properties. This work presents the study of the chemical composition of Essential Oil extracted from Lavandula Pedunculata from the middle atlas of Morocco and its antioxidant and antibacterial power. The EO was obtained by hydrodistillation and analyzed by gas chromatography coupled to mass spectrometry. The antibacterial power of EO was estimated by the disk diffusion method against six bacterial species stemming from the hospital. Antioxidant activity was tested by two methods: measuring the trapping power of DPPH radical and measuring the Ferric Reducing/Antioxidant Potential (FRAP). The chromatographic analysis of Lavandula Pedunculata essential oil allowed the identification of 55 compounds representing 98.9% of the essential oil, of which the major compounds are camphor (44.16%), 1 –epi-cubenol (8.61%), fenchone (7.48%), camphene (6.45%) and α-pinene (4.86%). Antibacterial power tests showed that L. Pedunculata EO effect on all the tested bacteria is lower than that of the most powerful Antibiotic and even powerless on certain strains. The obtained results from antioxidant power tests by both methods proved the antioxidant power of Lavandula Pedunculata EO but was less effective than ascorbic acid. The obtained results indicate that the plant EO’s antibacterial and antioxidant activities are not powerful compared to antibiotics and ascorbic acid respectively, but enough to explain the traditional therapeutic use of the plant.
Fencing land impacts on plant biodiversity and argan trees dynamic in the Ida-Ou-Tanane (central western of Morocco)
Authors: Ait Haddou M , Ben El Caid M , Aydda A , Bouchriti Y , Wanaim A , Gougueni H , Ezaidi S
Published: October 2022

The argan trees are subject to strong anthropgenic pressure that prevents its natural regeneration. This study aims to evaluate the effect of lands fencing on the redynamization of the argan trees through analyzing and comparing the specific richness in two closer parcels. The first parcel have been fenced since 2004, whereas the second one is an open land. In this study, the floristic diversity indices were investigated and compared based on field inventory from both parcels. The results obtained show the beneficial effect of the fence on the dynamics of the vegetation. The plant specific richness is higher for the fenced parcel than unfenced parcel (37 and 21 species, respectively). For the fenced parcel, the maximum diversity index is about 3.61, while it is about 3.04 for the unfenced parcel. The Shannon-Weaver index (H’) and the evenness (E) are also higher for the fenced parcel where the cover rate is 57% compared to 32% for the unfenced parcel. The average of the computed argan trees, in the fenced parcel, is 116 trees/ha of size ranging between 2 to 5 m. For the unfenced parcel, the average is 83 trees/ha of size of 4 m. Additionally, inside the fenced parcel, the natural regeneration by seedling is well marked, where considerable number of argan trees towere identified during field survey. These results highlight the importance to use fencing in the generation of the endemic plants.
Water Uses in Agriculture and Preservation Measures: What types of Relationships Between Them? Case of El Hajeb Province
Authors: El Allaoui A , Aafir M , Elyaagoubi M
Published: October 2022

Large scale forces are reshaping the world of water, like climate change, human settlements, and human economic activities. These forces make water management a challenging issue that has become more and more complicated with multiplicity and increasing need to use water. That is why sustained water management requires coordination between preservation measures and the different ways of water uses. In this article, we investigate and approach these two components through the expansion of agriculture as a main human activity in the Province of El Hajeb, to underline and analyze the types of relationships existing between water uses and conservation measures.
Evaluation of the metallic and bacteriological quality of well water in Khenifra province (Morocco).
Authors: El Hammioui Y , Anarghou H , Belghiti ML , Hachi T , Elhamdouni D , Laiboud C , Essabiri H , Boumalkha O , Khaffou M , Abba E H
Published: October 2022

Water contaminated by microorganisms and chemical molecules is a cause of disease for humans and the environment. For this reason, we have assessed the microbiological quality and metallic trace elements of groundwater used by the rural population of the Khenifra province, Morocco. Two groundwater sampling campaigns were carried out during the period February/August 2021, studying physico-chemical parameters such as temperature, electrical conductivity, dissolved oxygen, and ph. Then, the metallic trace elements were analyzed: lead (Pb), copper (Cu), nickel (Ni), manganese (Mn), iron (Fe), and zinc (Zn). In addition, the samples taken for the bacteriological study were filtered and introduced in a growth medium for the research and enumeration of total aerobic mesophilic germs vary from 1 to 30.103CFUs/ml, total coliforms (1 to 3x102 CFUs/100ml), Escherichia Coli(1 to 3x102 CFUs/100ml)and intestinal enterococci(1 to 290 CFUs/100ml). The analysis was carried out according to the recommendations of Moroccan standards. It is interesting to note that the groundwater in the Khenifra region is contaminated with pollutants and can cause a health risk for the inhabitants.
Characterization and spatialization of the Physico-chemical quality of the waters of a natural lake of the Middle Atlas: the case of the Ramsar site lake Aguelmam Sidi Ali
Authors: Laadel N , Elouhabi R , Baladia Y , El Idrissi H , Sadiq M , Abba EH , Achiban H
Published: October 2022

The physicochemical quality of the water represents a major stake in front of the development of the piscicultural life in the natural lakes. The present work has for objective the characterization of the waters of the two parts of the Ramsar site of the lake Aguelmam Sidi Ali as well as the definition of their future vocations, as far as they present currently a great biological, ecological, and tourist interest. A follow-up of the evolution of the physicochemical quality of the two parts of the lake (small lake and large lake), via monthly samples for analyses in the laboratory and in-situ measurements of the principal physicochemical parameters, was carried out. The samplings were spread out over the period from April to December 2019. In light of the results obtained, the waters of the two parts of the lake aguelmam Sidi Ali did not present the same degrees of mineralization and hardness, and therefore, they show a clear difference in water quality. Despite this difference, the quality of the waters of Aguelmam Sidi Ali is generally good and thus favorable to the development of the percids introduced since 1939.
The Development Planning of the InaCORS BIG for Disaster Climate Environment and Hazard Mitigation
Authors: Safií Ayu Nur , Susilo  , Wibowo Sidik Tri
Published: October 2022

In the last decades, the development of the Indonesian Continuous Reference System (InaCORS) that installed by Geospatial Information Agency (Badan Informasi Geospasial/BIG) and National Land Agency (Badan Pertanahan Nasional/BPN) have been increasingly very rapidly. With the increasing development of InaCORS, it will be useful for purposes in various fields such as environmental disaster climate and hazard mitigation. The InaCORS sites should be installed in the selected area which services of positioning application can be maximized. There are several parameters that used to determine the location of InaCORS, such as existing location of InaCORS (BIG and BPN), tectonic plate boundaries, volcanoes, and land use system. By overlaying all parameters, We analyze using 50 km buffer for each site to determined which location that does not have service from InaCORS sites (blank are). The result shows that the distribution of InaCORS stations in the Papua island, Kalimatan island, small area in Sulawesi island and Sumatra island should be improved more. This information is very useful to analyzing the needs of InaCORS stations for Indonesia region, exspecially for as monitoring of environmental disaster climate and hazard mitigation
Building emergency infrastructure requirement to enhance urban resilience for earthquake: A case study of Surabaya building regulation
Authors: Pamungkas A , Larasati K D , Iranata D
Published: October 2022

The high potential impact of an earthquake in Surabaya City increases the urgency of the city to prepare for the emergency due to the earthquake event. One of them is to equip the landowners with building emergency infrastructures to ensure disaster survivors can meet daily needs during emergencies. The proposed emergency infrastructures are building emergency utilities, emergency facilities, and building evacuation systems. The proposed emergency infrastructures should also be accessed by the building residents and all the communities surrounding the buildings. Those additional proposed emergency infrastructures complement current building regulations in Surabaya. Therefore, modifying current building regulations may fasten up the city in providing emergency infrastructures on a city scale.
Strategies to Realize Prosperity for Provinces With Islands in Indonesia
Authors: Adhayanto Oksep , Nazaki  , Rahmawati Nanik , Arianto Bismar , Suwardi Nurhasanah , Subiakto Rudy , Suryadi  , Darmawan Eki , Pratama Ryan Anggria
Published: October 2022

The purpose of this research is to formulate a strategy for the welfare of the people in the archipelago by increasing funds in the regions. Currently, there are still many problems faced by the provincial government, which is an archipelagic province with many marine resources but little distribution of general allocation funds. These include poverty and welfare issues. A special approach is needed to overcome this problem by finding solutions based on laws and regulations. This type of research is descriptive qualitative with a literature and legislation approach. The conclusion of this research, first, it is necessary to reformulate the calculation of the general allocation fund which includes the sea area as an indicator of the calculation. Second, urging the ratification of local government regulations on islands as mandated in local government laws. Third, accelerate the discussion and ratification of the Archipelago Bill.
Study on river water treatment by photocatalysis using metal-modified titania nanotubes
Authors: Thuy Nguyen Thi , Diem Ngoc Vo Tran , Cam Tien Nguyen Thi , Thanh Dang Van , Thanh Nguyen Trung , Khoi Tran Tien , Huy Nguyen Nhat
Published: October 2022

This study aimed to treat river water for domestic water supply purposes in the South of Vietnam by photocatalysis. Since the pre-treatment of traditional coagulation was effective in removing turbidity and other pollutants, the photocatalytic step was mainly applied for the removal of organics and disinfection of pathogens. The titanium nanotubes (TNTs) was synthesized by hydrothermal method using Degussa P25 precursor and the TNTs was then impregnated with 12 metal salts (i.e., MgCl2, ZnSO4, SnCl2, MnSO4, Fe(NO3)3, Cu(NO3)2, and Ni(NO3)2, Al(NO3)3, CrCl3, Cd(NO3)2, Sr(NO3)2, and Co(NO3)2) under various molar ratios and different heating temperatures. Among these materials, the TNTs modified with Ni(NO3)2 solution provided the best organics and Coliforms treatment. Operating conditions of the photocatalytic process such as light irradiation, catalytic dosage, pH, and water sources affecting the pollutant treatment efficiency were evaluated. The results showed that TNTs which was prepared at pH 1.6, impregnated with Ni(NO3)2 at 1% molar ratio, and calcined at 400°C for 2 hours were able to treat organic contents at 83.33% removal efficiency and completely removed Coliforms under UVA irradiation for 20 min. We hence suggest this material as a promising photocatalyst for organic content removal and disinfection of surface water for drinking water supply.
CFD Simulation into the Spread of Covid-19 in a Passenger Deck of a Sea Transportation Model
Authors: Panggabean G R , Suastika I K , Hermawan Y A , Nugroho B , Utama I K A P
Published: October 2022

COVID-19 is a type of disease that emerged at the end of 2019 and can cause respiratory system disorders, ranging from mild symptoms such as flu to severe symptoms such as pneumonia. According to data released by WHO, in October 2020, the fatality rate caused by COVID-19 in Indonesia was 3.5%. Long-distance sea transportation with a large passenger capacity, in a countrylike Indonesia, has the potential to be one of the main locations for the spread of COVID-19 virus. To obtain the proper information, a numerical CFD RANSE based simulation is carried out on aneconomy-class passenger deck. The deck has a size of 14.1 meters x 15 meter together with maximum capacity of 206 passengers. The CFD simulation involves 3 main components, namely, air inlet, air outlet and mouth inlet, and k-epsilon turbulence modelling is used because it predicts well far from theboundaries. Finally, the simulation is expected to reflect the real situation of indoor transmission in a sea transportation vehicle in order to reduce the victims and provide a mitigation plan due to the spread of virus.
Bibliometric Analysis Of Fisheries Policy Articles In The Journal Scopus Written By Authors From Affiliates Of The 10 Best Universities In Indonesia
Authors: Darmawan Eki , Widianingsih Ida , Mulyawan Rahman , Rahmatunnisa Mudiyati
Published: October 2022

Considering that maritime and sea is the direction of Indonesia’s development going forward, it is necessary to study the development of Indonesia as a maritime and sea as the basis of development policies. But have the best campuses in Indonesia been thinking that way? need to be mapped by bilbiometric analysis. This study aims to analyze the bibliometric characteristics of articles on fisheries policy published in Scopus indexed journals by authors affiliated with the 10 best universities from Indonesia in Webometric 2021. Data entry is carried out in the range of 2010 to 2021. The method used is bibliometric analysis and publication content in the Scopus database. There are as many as 88 articles from Indonesia based on fisheries policy keywords published from 2010 to 2021 with affiliates of the 10 best universities in Indonesia. The findings show that from the affiliations of universities that have been categorized as the best, there are university of Indonesian as universities with a high level of productivity in publishing fisheries policies in Scopus publications. The highest ranking is based on the number of published articles and high citations. In conclusion, Indonesia with a country that has such a wide ocean or can be said as a maritime country is still not productive in discussing fisheries policy in the international world.
Simulation separation of triglycerides from Calophyllum inophyllum oil with continuous countercurrent extraction process using Aspen HYSYS
Authors: Gunawan S , Yuliasari N , Permatasari E N , Mawarni R R , Juwari
Published: October 2022

The trends of industry 4.0 transform a process design to a cost-effective development with digital simulation. The objective of this study was to simulate the separation and purification of triglycerides from crude Calophyllum inophyllum oil with a continuous countercurrent extraction method using Aspen HYSYS V.11 to find the appropriate binary parameter coefficients and predict the optimal conditions. It is expected that the oil’s purity suitable with the edible oil standards (minimum 96% triglycerides and 0.3% free fatty acids). The variables used are the flow rate (n-hexane + oil) to methanol and the total mass ratio of solvent to oil. The C. inophyllum oil used contains 63.91% triglycerides, 15.76% free fatty acids, 12.25% diglycerides, and 4.66% monoglycerides. It was evaluated by applying NRTL (Non-Random Two Liquid) and UNIQUAC (Universal Quasi Chemical) fluid packages with binary interaction parameters of UNIFAC-VLE, UNIFAC-LLE, Immiscible, and Modified (fitting parameters). The most suitable fluid package and binary interaction parameter pairing was achieved by combining NRTL fluid package with Modified binary interaction. The highest purity of triglycerides was 92.86%alongside a simulation error of 0.01% while the free fatty acid was 2.17% and 0.91%, respectively, at solvents (hexane and methanol) to oil mass ratio of 6:1 with a hexane-oil to methanol flow rate ratio of 6:15 (LPH/LPH). By upscaling the n number in the extractor, this model can predict the best result of separation and purification of triglycerides with the highest purity of triglycerides and free fatty acids were 96.736% and 0,0001%, respectively. Thus, the edible oil standards can be met.
Comparing Life Cycle Assessment of Fish Preservation Method on Fishing Vessels in Indonesia
Authors: Wibawa P.A. , Birmingham R.W. , Warmadewanthi I.D.A.A
Published: October 2022

The economic benefit that the fishermen can obtain primarily depends on the quality of their catches. Therefore, it is essential to ensure that the caught fish stays fresh until entering the market. The most common fish preservation on traditional fishing boats in Indonesia is block ice, which must be carried in the fish hold from the home port. In comparison, another alternative method for fish preservation is the Flake Ice machine that can produce ice on-board. The study on Life Cycle Assessment (LCA) was conducted on these two fish preservation methods to understand the environmental impact of each technique. For undertaking the assessments, LCA software known as SimaPro was employed. The system boundary for the LCA about fish preservation applied the “well to wheels” approach and covered the whole service life of the vessel for the full consecutive 20 years of operation. The functional unit for the assessment was fish preservation of 4 tonnes during a 7-day fishing trip. The input of the evaluation was the materials and energy required to produce the amount of ice or to operate a refrigeration system for each year of the vessel’s operation, with a total of 30 trips per year. The paper explored the environmental impact of these two fish preservation methods in terms of Ozone Layer Depletion and Global Warming.
Numerical Comparison of B20 Biodiesel and Petroleum Diesel in terms of Performance, Combustion, and Emission at Constant Speed
Authors: Ariani Betty , Wahyudi Dedy
Published: October 2022

To achieve energy efficiency and emission reduction in the shipping sector use of alternative marine fuel is one of the programs implemented. This study on alternative fuels is an active response to increasingly stringent emission regulations and the limited supply of fossil fuels. In addition, an operational feasibility study is an important thing. The method used in this research is computational fluid dynamics to see how the engine performance, combustion, and emissions when using biodiesel B20 at a constant speed of 2200 Rpm compared to when using petroleum diesel. From the results of the numerical comparison study, the use of B20 compared to petroleum diesel, there was an increase in engine performance the level of fuel consumption was higher. The use of B20 causes CO and UHC emissions to decrease while NOx increases compared to petroleum diesel.
Scleractinian recruits on natural and artificial substrates in temporary sediment-challenged coastal water of Bangkalan, Madura Island, Indonesia
Authors: Muzaki F K , Saptarini D , Armono R H D , Setiamarga D H E , Azizah I R , Aunurohim  , Pradana F E
Published: October 2022

Recruitment of coral juveniles could serve as indicator for potential of coral reef recovery and is a critical process in supporting population as well as facilitating recovery after event of disturbance. However, sediments suspended in the water column and settling on to reef surface can negatively influence the distributions and abundances of reef-building corals, including altering the settlement patterns and survival of coral larvae and new recruits. In this study, we compared the density and diversity of Scleractinian recruits on natural substrate and artificial reef (made of concrete; 2 years after deployment) in the relatively turbid water of Sepulu coastal water, Bangkalan – Madura Island, East Java. Observation of stony coral recruits were conducted in-situ at depth of 3-4 meter in two locations. At the end of the study, we identified 18 species of Scleractinians from 10 genera and 7 families; dominated by Goniopora (F. Poritidae), Galaxea (F. Euphyllidae) and Goniastrea (F. Merulinidae). There was no difference in term of species richness and composition among locations and type of substrate. However, in both locations, more recruits grown in concrete artificial reef (15.2±2.61 - 18.3±2.91 unit/m2) compared to natural substrate (4±1.25 - 4.1±1.29 unit/m2), respectively. These findings suggest that concrete artificial reef is applicable for coral reef restoration and rehabilitation in temporary turbid coastal water by providing suitable substrate for larval recruitments.
Wave transmission model over hexagonal artificial reefs using DualSPHysics
Authors: Armono Haryo Dwito , Manurung Adelbert , Sujantoko  , Ketut Suastika I
Published: October 2022

The functions and uses of artificial reefs have evolved from a method of coral reefs restoration to a coastal protection system. The artificial reef can reduce the hydraulic load on the coast to the level required to maintain shoreline balance. Various materials and shapes of artificial reefs have been introduced. This paper discussed the wave transmission over the hexagonal-shaped artificial reef with six holes on each side. The study was conducted using the Smoothed Particle Hydrodynamic (SPH) method integrated into DualSPHysics software to see the effect of gaps between structures with a predetermined configuration on the value of the transmission coefficient (Kt). It was found that the arrangement with no gap could absorb waves better than the configuration with a gap of 0.15 m and 0.112 m based on the Kt value obtained. In terms of hydrodynamics, it was found that: (1) The increment of the wave steepness, the smaller the Kt value obtained, (2) The larger the wave height, the smaller the Kt value at 0.1 m freeboard depth. However, on the freeboard with a depth of 0.2 m and 0.3 m, it was found that the greater the wave height, the greater the Kt value, (3) the increment of the wave period, the Kt was higher, and also (4) the higher the freeboard, the higher the Kt values.
Low Cost GNSS Trimble BD982 and U-blox Performance Test Analysis F9 Series for Several Measurement Methods (Case Study: Sidoarjo Regency)
Authors: Ubaidillah M R , Cahyadi M N
Published: October 2022

Global Navigation Satellite System (GNSS) is a tool that can assist community activities, especially in navigation and positioning for mapping surveys. This tool has an accuracy of up to millimeters for determining the position of latitude and longitude, but to get this accuracy requires an expensive cost, which is more than 200 million rupiah. Currently the development of GNSS receivers is very rapid, one of which is a low-cost GNSS product. The advantages of this receiver are that it has a low cost, light weight and an accuracy of up to centimeters for determining latitude and longitude positions. In this study, we have conducted trials using a low-cost GNSS receiver from several products such as U-blox, Trimble, and Comnav. For products from U-blox in this study, the F9P and F9R series were used. The F9R series is one of the receivers that has been integrated with the inertial measurement unit (IMU)/inertial navigation system (INS), the benefit of this integration is to improve position accuracy when data collection using the kinematic method. Products from U-blox have position accuracy below 1 meter. Meanwhile, the series used in Trimble and Comnav products are Trimble BD982 and Comnav Oem Board K708 which have accuracy below 1 centimeter. The purpose of this activity is to compare all these receivers by using Comnav OEM Board K708 data as validation data. Several parameters in this study will be analyzed such as the number of satellites obtained by the receiver, position accuracy and various other analyzes. The measurement methods that will be carried out in this study are static differential and Real Time Kinematic (RTK) measurements that utilize direct corrections from Continuously Operating Reference Stations (CORS) and deformation observations. The results of the first analysis obtained in this activity are the number of satellites obtained by the U-blox F9 series receiver which is more stable to receive satellites, namely as many as 24-29 satellites, then Trimble BD982 as many as 2-32 satellites, and Comnav K708 receivers as many as 3-28 satellites. Meanwhile, the Dilution Of Precision (DOP) values for 4 receivers, namely K708, F9P, and F9R, have stable values ranging from 0.5-1 compared to the BD982 receiver which fluctuated in several observation epochs, especially in the last observation epoch. In observations using the static differential method, using corrections from CORS for positioning this receiver can be used because the difference in position data is in the range of 0.009 m - 0.040 m from reference data (receiver K708). Meanwhile, the data receiver that has been integrated with IMU/INS (F9R) kinematic method has the smallest position difference value (K708) compared to other receivers, which is from 0.001 m - 8.091 m. In testing for deformation measurements, further research needs to be done because the data obtained is still in the form of a simulation.
Recovery of Ca2+ and SO4
2- from Bittern Wastewater using Electrodialysis Method
Authors: Trihasti Kartika Sucahyaning Wahyu , Bagastyo Arseto Yekti
Published: October 2022

The recovery of bittern is expected to obtain the added value products and minimize untreated wastewater disposal generated from the salt industry. Bittern is a waste stream resulted from the crystallization of the salt production process, consisting of a concentrated mineral in liquid form, known as the mother liquor of salt. The dominant minerals that can be recovered in bittern are calcium (Ca2+) and sulfate (SO4
2-), and salts such as calcium chloride, potassium sulfate, sodium chloride, and calcium sulfate, which are commonly found in bittern wastewater. In this study, mineral recovery of bittern was conducted by applying cylindrical membrane electrodialysis technology, due to the high demineralization rate and the applicability on fluctuating composition of the feed. This study determined differences in applied electrical current, temperature conditioning, recirculation flow rate, and specific energy requirements based on the optimum process. This research was conducted in the applied current of 5A, 7.5A, and 10A. Then, the temperature conditioning in the feed tank with a range of 25°C – 35°C, 36°C – 45°C, and without conditioning. The applied flow rate recirculation was 30 L/h and 36 L/h for 5 hours electrodialysis time. The highest removal efficiency was 31.57% and 35.03%. This result was achieved at 30 L/hour of flow rate recirculation, 10 A, and 40°C for Ca2+ and SO4
2-. Furthermore, the recovery efficiency of the ionic products was 30.17% and 27.62% for Ca2+ and SO4
2-, respectively.
Determination of Water Quality Status Using the STORET Method and Identification of Pollutants in the Kobe River, Central Halmahera Regency
Authors: Marengke M K S , Nurhayati E
Published: October 2022

The Kobe River is one of the rivers in Central Halmahera Regency which is used for households, irrigation, fisheries, animal husbandry, and plantations. The Kobe River is located around the mining area which causes the condition of the Kobe River to decline. This study aims to determine the quality status of the Kobe River and identify the pollution that occurs in the river. The study began by collecting primary data in the form of water quality tests with parameters of temperature, DO, TSS, and Ammonium at 5 sampling locations. This study determines the Quality Status using the STORET method which refers to the Decree of the Minister of the Environment No. 113 of 2003 based on the value system of the US-EPA (Environmental Protection Agency). The results showed that the determination of the quality status of the Kobe River was getting a score of 0 which was included in class A in the very good category with the status of the Kobe River meeting the quality standards so that it could be used according to its designation. Then obtained sources of pollution in the form of domestic waste and mining activities from PT Weda Bay Nickel and PT Tekindo Energy. Pollution control strategies that need to be carried out are determining the Pollution Load Capacity (DTBP) of the Kobe River, making communal wastewater treatment, making the study of the Kobe River DTBP as a basis for granting permits, and increasing law enforcement for activities/businesses that violate.
Influence of workpiece tolerances on the fixtures design. Case study
Authors: Stanasel I. , Blaga F.S. , Tocut P.D. , Groza M.D. , Stanasel C.M.
Published: October 2022

The tolerances of a part influence both the operation of the assembly of which it is part and the technological manufacturing process. High tolerances can lead to an assembly that does not work at the designed parameters, and low tolerances require additional machining operations that increase the cost of the part. The manufacturing series is another factor that influences the technological process. Large series production requires special facilities in terms of processing and control equipment which are needed in the manufacturing process. The paper presents a case study on the influence of tolerances of a part being produced in large series on the construction of the orientation and clamping device used in machining. Starting from the dimensions indicated in the design drawing, a first version of the fixture is proposed in which the parts are fixed and the tolerance of the closing dimension of the assembly of parts is analysed using the Worst Case and Root-Sum-Square methods. Since the closure size tolerance is outside the recommended range, another variant of orientation and fixture is proposed. By re-analysing, the closing dimension tolerance by the two methods mentioned above it was confirmed the necessity of modifying the part width tolerance. The analysis of the tolerance of the closing quota is resumed by the two methods mentioned above and the result confirms that it is necessary to change the tolerance to the width of the piece. The tolerance verification of the closure dimension of the assembly formed by the parts fixed in the device is performed by Monte Carlo simulation.
Stacking sequence effect on flexural behavior of hybrid GF/CF biocomposite used in orthopedics
Authors: Bejinaru-Mihoc A , Mitu L G , Roşca I C
Published: October 2022

In the field of orthopedic medicine, hybrid biocomposites with epoxy matrix reinforced with carbon fibers and glass fibers are being used. Through the hybridization phenomenon, appropriate properties can be obtained for the use of these biocomposites in the bone plate and external fixation. The paper presents the manufacture of hybrid laminate with epoxy matrix reinforced with carbon fiber and glass fiber, three-point bending test method and the laminate layering sequence influence upon the bending behavior of composite biomaterial.