bluuebunny/crossref_metadata_2025 huggingface dataset:
Influence of the active region structure of the resonant tunneling diode on the critical points of its current-voltage characteristic
Authors: Yatsun К.S.
Published: May 2022

The article proposes a study of the effect of the structure of the active region of a resonant tunneling diode on the critical points of its current-voltage characteristic. The basic configuration of a resonant tunneling diode, which is a structure of a quantum well with a nanometer-sized double barrier including two contacts, and a region with strongly doped contacts made of a semiconductor with a relatively small band gap, is disclosed and illustrated. It is emphasized that since the characteristic dimensions of the structure of the quantum well with a double barrier are comparable to the wavelengths of electrons, the wave nature of electrons leads to such quantum phenomena as interference, tunneling, energy quantization, etc. the double barrier causes resonant tunneling phenomena, which form the basis for the operation of the resonant-tunneling diode. It is emphasized that repeated reflection causes destructive or constructive interference depending on the wavelength of a particular electron. For electrons with a certain wavelength that promotes constructive interference, a transfer probability close to unity can be found at energies corresponding to these wavelengths. The modification of the active region of the resonant tunnel diode with a barrier height of 0.3 - 0.4 eV is mathematically substantiated. The dependence of the transmission coefficient is found by solving the Schrödinger equation in one electron approximation without taking into account the scattering effects. The calculation of the volt-ampere characteristic of the resonant-tunnel diode was performed at temperatures of 100 and 300 K. The given volt-ampere characteristics were obtained without taking into account the effects of electron scattering. However, it should be noted that the main influencing factor is the resonant tunneling through the second level, for which the peak of the transmission coefficient is much wider and higher. However, in gallium doped arsenide, the fact of electron scattering can significantly affect the value of the transmission coefficient and the value of current. It is established that an increase in the width of quantum wells leads to a significant decrease in the densities of peak currents and valley currents, and an increase in the width of potential barriers leads to a slight decrease in the current density of the first peak and current densities of the second peak and valley.
Las perspectivas de un viajero filosófico. Un análisis de las valoraciones de Ortega y Gasset sobre Argentina
Authors: Sosa Paula Jimena
Published: May 2022

El presente trabajo se propone analizar algunas perspectivas desplegadas por Ortega y Gasset durante sus viajes Argentina. En primer lugar, desde la sociología de los intelectuales, analizaremos el rol del pensador español en Argentina, teniendo en cuenta los vínculos creados con figuras centrales del campo intelectual como Coriolano Alberini, Alejandro Korn y otros, como también la mirada que estos intelectuales tienen en torno a Ortega y Gasset. Luego, desde la historia de las ideas, como análisis del discurso, analizaremos algunos de sus ensayos, escritos durante y posteriormente a sus viajes. El análisis de este material permitirá la reconstrucción de la perspectiva del filósofo sobre Argentina, atendiendo a los posicionamientos filosófico-políticos presentes en las representaciones, metáforas y binarismos con los que conceptualiza su experiencia de viaje.
Existencia, viajes e ideas. Avatares del homo aviator
Authors: Pérez Lindo Augusto
Published: May 2022

Reconocernos en los itinerarios que hemos vivido y reconocer nuestras trayectorias intelectuales a través de los mismos es una decisión que nos recuerda los viajes de la Iliada, los pasajes simbólicos de Dante Alighieri por el Infierno en la Divina Comedia o los manuscritos filosóficos de la Edad Media donde se hablaba del “itinerarium mentis in Deum”. En mis viajes experimenté el asombro, la alegría o la iluminación, pero también el desencanto, la angustia y el desgarramiento.
Analytical Mechanics of Magnetic Particles Suspended in Magnetorheological Fluid
Authors: Hanmant Salunkhe  , Surendra Thikane
Published: May 2022

In this paper, the behavior of MR particles has been systematically investigated within the scope of analytical mechanics. . A magnetorheological fluid belongs to a class of smart materials. In magnetorheological fluids, the motion of magnetic particles is controlled by the action of internal and external forces. This paper presents analytical mechanics for the interaction of system of particles in MR fluid. In this paper, basic principles of Analytical Mechanics are utilized for the construction of equations.
bayesvl stan utilities: Build RStan models from directed acyclic graph
Authors: Mai Nhat Chi
Published: May 2022

bayesvl stan utilities: Build RStan models from directed acyclic graphDescription: Build Stan models from directed acyclic graph of an object of class bayesvl. (R package: bayesvl version 0.8.5; published: May 24, 2019)
TEOLOGI PAULUS TENTANG GEREJA RUMAH DALAM GEREJA MULA-MULA
Authors: Patiung Ibet
Published: May 2022

Dalam artikel ini membahas tentangTeologi Paulus tentang Gereja rumah dalam gerejamula-mula. Sebelum gereja berbentuk gedung dan organisasi ternyata pada masaperkembangannya yaitu abad mula-mula tidaklah memiliki konsep yang sama dengan gereja saat itu.Gereja saat ini hanya berbentuk Gedung dan organisasi. Gereja rumah dalam Gereja mula-mula yang di mana gereja ini merupakan cikal-bakal terbentuknya gereja saat ini.Dalam meningkatkan pelayanan-pelayanan dalam gereja saat ini, perlu adanya pembaharuan dalam tubuh gereja itu sendiri.Melalui pelayanan yang didasarkan pada Tuhan Yesus.Berbicara tentang teologi itu pasti sudah kita ketahui apa itu teologi untuk itu artikel ini membahas tentangTEOLOGI PAULUS TENTANG GEREJA RUMAH DALAM GEREJA MULA-MULA.
Phần mềm Việt bayesvl chính thức xuất bản trên CRAN
Authors: University KHCN Phenika
Published: May 2022

Ngày 24/05/2019, chương trình máy tính “bayesvl” chạy trên môi trường R (ngôn ngữ lập trình và môi trường phần mềm miễn phí phục vụ cho tính toán thống kê và đồ họa) do Trung tâm Nghiên cứu Khoa học Xã hội liên ngành (ISR), Trường Đại học PHENIKAA thiết kế và phát triển chính thức được xuất bản trên CRAN – thư viện lưu trữ, phân phối các phiên bản chính thức của R. Phần mềm được xuất bản đánh dấu cột mốc quan trọng cho hành trình hơn 18 tháng lên ý tưởng, thiết kế và triển khai của Trung tâm ISR. (Mã nguồn mở trên Github và CRAN.)
Impulsivity and loot box engagement
Authors: Garrett Eamon , Sauer James D. , Drummond Aaron , Lowe-Calverley Emily
Published: May 2022

Loot boxes (randomized rewards in video games) possess structural similarities to traditional forms of gambling, with a well-documented and robust link between problem gambling symptomatology and loot box spending. In this research, we present two studies investigating the role of impulsivity (an established predictor for problem gambling behaviour) and reward/punishment sensitivity in predicting loot box spending. Across two samples, a first recruited from MTurk (n = 342) and a second from Prolific Academic (n = 1142), Positive Urgency and Sensation Seeking (measured using the short UPPS-P) and BAS-Drive (measured using the BIS/BAS) were positively correlated with loot box spending. Combined, results indicate a positive reinforcement process is important in understanding loot box spending but provide evidence against a negative reinforcement mechanism (i.e., purchasing loot boxes to mitigate negative affect). Beyond problem gambling symptomatology, impulsivity may play a role in loot box purchasing, although there appear to be differences between problem gamblers and loot box purchasers in terms of impulsive features implicated.
Topological entropy and metric flow
Authors: Vitaliy K.
Published: May 2022

Topological entropy and metric Flow
Pengaruh Budgeting UKM Terhadap Kelangsungan Kegiatan Murid SDIT Ar-Rahmah Jakarta
Authors: Nahdiaty  , Kurniawan Rachmad Risqy
Published: May 2022

What will be discussed in this research is the Budgeting Process or an early stage of design in the beginning of running a business where the location that is the object of research is where the author works. entering the beginning of a new period) or the process of designing, executing, and operating a budget. It is the managerial process of budget planning and preparation, budget control and related procedures. Budgeting is not forecasting. Budgeting involves some kind of forecasting especially in the area of sales budget. But the process is physically one of detailed analysis and planning, not just forecasting future outcomes. Forecasting is a process of predicting a situation that is likely to occur without logical thinking, with respect to aspects of the world that are relevant and likely to affect future activities. Any organized business can avoid, anticipate or calculate future conditions and trends, market trends, to formulate future policies and decisions based on past data. Forecasting is concerned with events that may occur while budgeting is concerned with planned events. Budgeting or budgeting must be preceded by forecasting, but forecasting can be done for purposes other than budgeting, for example for the sales process. Thus, forecasting is made about what is likely to happen, while budgeting is the process of stating policies and programs that will be followed in the future. Furthermore, forecasting does not connote a sense of control, while budgeting is a control tool because it is an action that can be shaped as desired so that it can be adjusted to conditions that may or may not occur. In short, budgeting or budgeting is an operating and financial plan that lays out the targets that management seems to achieve based on the estimates made.Budgeting is important for every agency, for this case the author raises a case from where the author works, namely SDIT Ar Rahmah in the Jakarta area, the author is the Finance Section at SDIT Ar Rahmah from 2019 to the present (2022), therefore the following things things to be discussed and attached are based on the facts that happened.
R/bayesvl-class.R
Authors: Mai Nhat Chi
Published: May 2022

Man pages for bayesvlVisually Learning the Graphical Structure of Bayesian Networks and Performing MCMC with 'Stan'bayesvlBayesVL package for Bayesian statistical analyses in Rbayesvl-classClass 'bayesvl': object class of bayesvl modelgraphsUtilities to manipulate graphsLegends345Legends345 dataplotsPlot utilities for bayesvl objectsstanBuild RStan models from directed acyclic graphvl2bnbnlearn interface for bayesvl objectsbayesvl documentation built on May 24, 2019, 5:09 p.m. Man pages for bayesvlVisually Learning the Graphical Structure of Bayesian Networks and Performing MCMC with 'Stan'bayesvlBayesVL package for Bayesian statistical analyses in Rbayesvl-classClass 'bayesvl': object class of bayesvl modelgraphsUtilities to manipulate graphsLegends345Legends345 dataplotsPlot utilities for bayesvl objectsstanBuild RStan models from directed acyclic graphvl2bnbnlearn interface for bayesvl objectsbayesvl documentation built on May 24, 2019, 5:09 p.m.
Keteladanan Kepemimpinan Paulus Bagi Para Pemimpin Gereja Masa Kini
Authors: Siling Ritayani
Published: May 2022

Dalam artikel ini disusun dengan tujuan agar pemahaman mengenai Keteladanan kepemimpinanan dari Rasul Paulus bagi Pemimpin Gereja masa kini. Dalam kepemimpinan Gereja masa kini banyak para pemimpin yang kehilangan karakteristik yang tidak sesuai lagi dengan apa yang Tuhan Yesus ajarakan bahkan para pemimpin gereja seringkali mengatasnamakan kepentingan gereja demi kepentingan pribadi mereka atau hanya untuk kekuasaan mereka. Seorang pemimpin dalam kepemimpinannya harus melayani dan mengabdi dengan penuh kesungguhan tanpa ingin mencari kepentingannya sendiri,sesuai dengan karakter Yesus. Dalam tulisan ini,penulis secara metodik merujuk pada kepemimpinan seorang tokoh Alkitab khususnya dalam Perjanjian Baru yaitu Rasul Paulus. Dalam gereja masa kini seorang pemimpin/pelayan pasti memiliki karakter yang berbeda-beda,baik itu dalam kehidupannya sehari-hari dengan orang lain maupun dalam kehidupan pribadinya. Sehingga dalam tulisan ini penulis hendak memaparkan mengenai tentang keteladanan seorang tokoh alkitab yang mempunyai kepemimpinan yang seharusnya juga dimiliki oleh para pemimipin gereja masa kini yang bukan hanya melalui pengajarannya tetapi juga melalui cara hidupnya.
bayesvl plot utilities: Plot utilities for bayesvl objects
Authors: Mai Nhat Chi
Published: May 2022

bayesvl plot utilities: Plot utilities for bayesvl objectsDescriptionProvides plot methods and the interface to the MCMC module in the bayesplot package for plotting MCMC draws and diagnostics for an object of class bayesvl. (bayesvl 0.0.8; published: May 24, 2019)
Kaitan Pembelajaran Bahasa Indonesia dengan Lingkungan
Authors: Azufi Bashirah
Published: May 2022

kaitan pembelajaran bahasa indonesia dengan lingkungan
bayesvl graph utilities {bayesvl}: Utilities to manipulate graphs
Authors: Mai Nhat Chi
Published: May 2022

bayesvl graph utilities {bayesvl}R DocumentationUtilities to manipulate graphsDescriptionManipulate directed acyclic graph of an object of class bayesvl.
Designing Community Tracking Indicators for Open and Inclusive Scholarship
Authors: Altman Micah
Published: May 2022

There is evidence that scholarly processes have bias and create barriers to inclusion; more openness in scholarly communication is needed. Progress towards a better scholarly ecosystem requires comparable, reliable measures of the desired attributes of a better system. This paper describes an initiative in progress to produce standardized indicators that describe the volume and types of open science output systematically over time, using existing open data sources. We describe a replicable to clean, integrate, code, and analyze these sources to enable continuous publication of indicators. And we report on early results from this initiative, demonstrating how these indicators can go beyond ‘overall impact’ measures to advance the understanding of who is, and who is not, participating in open scholarship.
Caledonian hot zone magmatism in the “Newer Granites”: insight from the Cluanie and Clunes plutons, Northern Scottish Highlands
Authors: Milne Eilidh , Neill Iain , Millar Ian , McDonald Iain , Bird Anna , Dempsey Edward , Olive Valerie , Odling Nicholas , Waters Emma
Published: May 2022

Scottish “Newer” Granites record the evolution of the Caledonides resulting from Iapetus subduction and slab breakoff during the Silurian-Devonian Scandian Orogeny, but relationships between geodynamics, petrogenesis and emplacement are incomplete. Laser ablation U-Pb results from magmatic zircons at the Cluanie Pluton (Northern Highlands) identify clusters of concordant Silurian data points. A cluster with a weighted mean 206Pb/238U age of 431.6 ± 1.3 Ma (2sigma confidence interval, n = 6) records emplacement whilst older points (clustered at 441.8 ± 2.3 Ma, n = 9) record deep crustal hot zone magmatism prior to ascent. The Cluanie Pluton, and its neighbour the ~428 Ma Clunes tonalite, have adakite-like high Na, Sr/Y, La/Yb and low Mg, Ni and Cr characteristics, and lack mafic facies common in other “Newer Granites”. These geochemical signatures indicate the tapping of batches of homogenised, evolved magma from the deeper crust. The emplacement age of the Cluanie Pluton confirms volumetrically modest subduction-related magmatism occurred beneath the Northern Highlands before slab breakoff, probably as a result of crustal thickening during the ~450 Ma Grampian 2 event. Extensive new in-situ geochemical-geochronological studies for this terrane may further substantiate the deep crustal hot zone model and the association between Caledonian magmatism and potentially metallogenesis. The term “Newer Granites” is outdated as it ignores the demonstrated relationships between magmatism, Scandian orogenesis and slab breakoff. Hence, “Caledonian intrusions” would be a more appropriate generic term to cover those bodies related to either Iapetus subduction or to slab breakoff.
Adolescents’ pluralistic ignorance and reasoning about COVID-19 public health behaviors
Authors: McGuire Luke , Farooq Aqsa , Rutland Adam
Published: May 2022

Pluralistic ignorance (the inaccurate perception that one’s behavior differs from that of the average individual) can shift behavior towards perceived norms. Such behaviors are also accompanied by social reasoning processes. The present work examined adolescents’ pluralistic ignorance and reasoning in the COVID-19 context. Participants (n = 130, M age = 16.96, SD = 1.06) demonstrated pluralistic ignorance by reporting that they were more likely to engage in public health behaviors compared to their peers or the average teenager. Participants negatively evaluated guideline breaches and reasoned about harm reduction to justify this, but also recognised the importance of protecting mental health. Together this evidence documents the importance of considering social norms and reasoning in public health contexts to frame communication efforts.
Can AI governance be progressive? Group interests, group privacy and abnormal justice
Authors: Taylor Linnet
Published: May 2022

This paper asks whether our current thin concept of responsibility can be made into a thicker one that takes in more than compliance with law and basic ethical principles. Using examples from the societal uses of AI it suggests we employ Fraser's notion of abnormal justice (2008) and Mouffe's idea of agonistic democracy (2013) to broaden our idea of who should be involved in a justice-based vision of AI governance.
COMPARISON OF MERISTIC CHARACTERISTICS OF Barbodes schwanefeldii LIVING AROUND THE FLOATING NET CAGE AREA AND IN THE AREA WITH NO FLOATING NET CAGE IN THE KOTO PANJANG DAM RIAU PROVINCE
Authors: Sari Desi Maya , Putra Ridwan Manda , Windarti Windarti
Published: May 2022

Barbodes schwanefeldii or kapiek fish is a type of freshwater fish that lives around the floating net cage area and in the area with no floating net cage in the Koto Panjang Dam. This study aims to determine the meristical characteristics of B. schwanefeldii living in that dam, especially around the floating net cage area and in the area with no floating net cage. This study was conducted in October-November 2021. Sampling was  done 1 time, the number of fish collected  was 68 fishes that were caught around floating net cage and 23 fishes that were caught in the area with no floating net cage. A total of 11 meristical characteristics were calculated and studied. Results shown that there were no significant morphological and meristical different of the fish living in the area with cage or in the area with no floating net cage. The the meristical characteristics were as follows: D III.8, P I.14, V I.8, A I.5, C 18. The number of scales in front of the dorsal fin was 13 scales, around the body was 28-30, around the caudal peduncle was 18, in the linea lateralis was 34-36, above linea lateralis was 8 and below linea lateralis was 4
PRODUCTION PERFORMANCE OF BRONZE FEATHERBACK (Notopterus notopterus, Pallas 1769) REARED WITH DIFFERENT STOCKING DENSITIES AND TYPES OF FEED
Authors: Yulindra Ade , Sukendi Sukendi , Aryani Netti
Published: May 2022

Bronze featherback is one of Indonesia’s endemic fish that has high economic value and has begun to decline in population in nature. There should be attempts at bronze featherback farming to maintain its existence in nature. The purpose of this study was to analyze the production performance, feed retention, and glycogen accumulation of bronze featherback cultivated with stocking density and different types of feed. This study was conducted from May to August 2020 in Sungai Paku Village, Kampar Kiri sub-district,  Kampar district. The experiment design used is a randomized complete design with two factors. Stocking density factor treatment consists of 5, 10, and 15 fish/m3 and type of feed factor consisting of trash fish and freshwater seashell meat feed. Bronze featherback was cultivated for 90 days. The fish was cultivated with 5% feed/day. Best result was in the stocking density of 5 fish/m3 and trash fish feed showed Absolute growth rate 50,05 g, Absolute length growth rate 11,48 cm, specific growth rate 2,83%, survival rate 86,7%, protein retention 68,68%, fat retention 34,11%, muscle glycogen 28,86 mg/g and liver glycogen 0,58 mg/g.
OPTIMIZATION OF THE GROWTH MEDIA OF Bacillus cereus BACTERIA WITH THE ADDITION OF SKIM MILK AND DIFFERENT CARBON SOURCES
Authors: Taufan Muhammad , Feliatra Feliatra , Effendi Irwan
Published: May 2022

The goal of this research was to find the optimal media for growing B. cereus bacteria with various carbon sources. This study used an experimental method with two Bacillus cereus bacterium isolates, namely B. cereus strain SN7 (isolate N) and a consortium of bacteria isolates (a combination of several B. cereus isolates with different strains). The two isolates were grown in sago liquid waste media, tofu liquid waste media, and molasses liquid waste media supplemented with a protein source, skim milk, with three replications in each treatment. Bacterial culture growth was measured every 6 hours for 24 hours using two methods: the TPC method and bacterial cell biomass measurement. According to the results of this study's measurements, molasses waste media was the best modified medium for B.cereus growth. The difference in growth between the B. cereus strain SN7 bacterial isolates and the consortium cultured on molasses media was not significant. The isolates with the largest number of cell growth were B. cereus consortium isolates, with 2,023 x108 CFU/mL in the TPC method and 1,011 g/mL in the biomass measurement method at 24 hours
FUEL RECOMMENDATION INFORMATION SYSTEM (BBM) CASE STUDY: MINISTRY OF MARINE, FISHERIES AND FOOD OF NAGAN RAYA REGENCY
Authors: Fadhillah Nur , Tahir Muhammad Agam
Published: May 2022

The Department of Maritime Affairs, Fisheries and Food (DKPP) of Nagan Raya Regency is a fully authorized body in managing all fisheries, marine and food activities in Nagan Raya Regency, Aceh Province. One important factor in supporting the productivity of capture fisheries is fuel oil (BBM) for small and medium fishermen. The fulfillment of fuel for fishermen is influenced by the length of stay at sea, the distance to the fishing ground, the size of the vessel, the type of equipment used, the vessel used and the fuel used. The fuel recommendation information system for fishermen is influential as the carrying capacity of information effectiveness between the service and fishermen. The information system itself is a group of elements that are interconnected or interact to form a single unit with an approach using quantitative methods and participatory observation. make a solution to the DKPP Nagan Raya as an effort to create a BBM Information System Application with the aim of facilitating an information system or fuel data collection, data collection of fishermen, and data collection of fishermen's catches. The BBM Information System application with a click using the fisherman's android will be greatly facilitated in the BBM recommendation process because it is in accordance with the quota received. In addition, this application method also makes it easier to monitor and report fuel distribution to fishermen, because everything can be integrated and can be monitored directly by the Marine Fisheries Service of Nagan Raya Regency.
FERTILITY ANALYSIS OF BUNGUS TELUK KABUNG WATERS BASED ON THE CONCENTRATIONS OF NITRATE, PHOSPHATE, AND THE ABUNDANCE OF PHYTOPLANKTON
Authors: Lazuardi Andika , Nedi Syahril , Siregar Sofyan Husein
Published: May 2022

Water fertility is the capacity or ability of waters to provide suitable nutrients for the life of phytoplankton so that it can produce optimum production. This research was conducted on June 2021 in the Waters of Bungus Teluk Kabung, Padang, West Sumatra. The purpose of this study was to determine the fertility level of Bungus Teluk Kabung waters based on the concentration of nitrate, phosphate, and the abundance of phytoplankton. The results of this study show that the fertility rate of Bungus Teluk Kabung waters based on the value of nitrate concentration, phosphate, and phytoplankton abundance in the waters of Bungus Teluk Kabung, Padang, West Sumatra, belongs to the category of waters with low fertility levels (Oligotrophic) to moderate fertility levels (Mesotrophic). The concentration of nitrate and phosphate has a weak relationship with the abundance of phytoplankton in the waters of Bungus Teluk Kabung and there isn’t any significant effect between the concentration of nitrate and phosphate with the abundance of phytoplankton in the waters of Bungus Teluk Kabung, Padang, West Sumatra
THE EDUCATION TO INCREASE AWARENESS OF FISHERMEN’S SAFETY AND SECURITY THROUGH CERTIFICATION IN ORDER TO INCREASE HUMAN DEVELOPMENT INDEX IN CENTRAL JAVA: LITERATURE STUDY
Authors: Almuzani Nafi , Purnomo Teguh
Published: May 2022

Fisherman is someone who works to do fishing activities in the sea with the aim of some or all of the proceeds sold. Fishermen have a high risk to their work, therefore the importance of safety and security culture in fishermen and the environment is very important to develop. The certification to fishermen through education and training of Basic Safety Training Motor Sailboats is an effort to improve the development of educational and economic aspects. In the aspect of education, certification will provide education to the community especially fishermen about the importance of safety and security while in the economic aspect is improving welfare and job search opportunities through certification in the community. The results of support for the development of the education sector and the economy are expected to increase the number of human development indexes, especially in central Java. Observations are carried out based on literature studies and then an approach to the implementation provided is through the implementation of community empowerment training programs. The human development index in Central Java Province which has increased by 0.20% in 2020 is expected to continue to increase, therefore observations are carried out in an effort to find out what things can support the sustainability of increased development, especially in economic aspects and education in the maritime field
EFFECTS OF BIOFLOC AND PHOTOPERIOD MANIPULATION COMBINATION ON BLOOD STRUCTURE OF Pangasianodon hypophthalmus
Authors: Surbakti Yuli Anggreani Putri Br , Windarti Windarti , Eddiwan Eddiwan
Published: May 2022

Pangasianodon hypopthalmus  can be reared under biofloc system and short photoperiod. To understand the effect of biofloc system and photoperiod manipulation to wards blood structure of P. hypopthalmus a study was conducted on September to December 2020. This experiment using a factorial CRD design with 2 level for B factor (biofloc and no biofloc), 3 level for P factor (Natural, 18 hours dark, 24 hours dark), 3 repetition. The fish was reared in 110L tank, 30 fishes/tank, fed with fish pellet (FF-999, Provit 781-1 and Provit 781-2). Parameters measured were the number of erythrocytes, leukocytes, the level of hematocrit and leukocrite and leukocyte types. The blood was collected using syringe wetted with EDTA 10%. The number of blood cells was calculated using haemocytometer, while the white blood cells were stained using Giemsa solution and checked under a binocular microscope. Results shown that there is no different blood structure in fish of all treatments. Total erythrocytes are 1,681,111-2,647,777 cell/mm3, total leukocytes are 55.031-55.655 cell/mm3, hematocrit 20.33-38.11% and leukocrite 20.33-38.11%. White corpuscle are basophil 00-3.89%, eosinophils 0-3.67%, lymphocytes 26.67-73.89%, trombosit 1-48.89%, monocytes 13.33-30.22% and neutrophill 0.00-9.22%. Based on data obtained, it can be concluded that the biofloc system and photoperiod manipulation combination do not negatively affects the fish hematology.
PENGETAHUAN MASYARAKAT LOKAL DI DAERAH PENYANGGA SUAKA MARGASATWA BUKIT RIMBANG BUKIT BALING TENTANG BUDIDAYA LEBAH KELULUT (Trigona spp.)
Authors: Hidayat Yossi Oktorini , Qomar Nurul , Oktorini Yossi
Published: May 2022

Bukit Rimbang Bukit Baling Wildlife Reserve (BRBB) was designated in 1982 and was established in 2014 based on the Decree of the Minister of Forestry SK Number. 3977 / Menhut-VIII / KUH / 2014 dated May 23, 2014 covering an area of 141,226.25 ha in Kampar Regency and Kuantan Singingi Regency, Riau Province. The aim of this study was find out about local community knowledge in the Wildlife Conservation Area (BRBB) about kelulut or stingless bee (Trigona spp.) cultivation and to know the relationship between the respondent characteristics with that knowledge. This method of this research was quantitative approaches. The number of respondents was 85 people, selected based on random sampling spread in Koto Lamo Village, Bukit Betung Village, and Tanjung Belit Selatan Village. Data were analyzed statistically by chi-square test. The results of this study show that the local community has knowledge about stingless bee cultivation at the “knowing” level. Individual factors that were significantly related to people's knowledge of stingless bee cultivation were gender, employment, and education
ANALISIS POTENSI TANAMAN HUTAN INDUSTRI SEBAGAI AGEN FITOREMEDIASI CEMARAN LOGAM BERAT ASAL ABU TERBANG
Authors: Daryat Fikri , Rasyad Aslim , Nasution Syarifuddin
Published: May 2022

Analysis of the ability of industrial forest plants such as A. crassicarpa and A. mangium can act as phytoremediation agents in absorbing heavy metals (Cd, Co and Pb) contained in coal-burning fly ash boilers that can be used as peat soil ameliorants. Provision of fly ash on peat soils has potential to pollute the soil. The purpose of this study was to analyze the effectiveness of forest indutrial plants in reducing heavy metal content in soils contaminated with fly ash and to estimate how much economic valuation is valued for the phytoremediation ability of acacia plants in the case of heavy metal contamination from pulp industry activities and paper.The results of the analysis of the ability of industrial forest plants in absorbing heavy metals show that A. crassicarpa is better at absorbing Pb metal, A. mangium is better at absorbing Co metals and Cd metal showed no significant difference between the two types of industrial forest plants
IDENTIFIKASI PERTIMBANGAN PEMILIHAN KOMPONEN PENYUSUN AGROFORESTRI SALAK DI DESA SIATARATOIT KECAMATAN ANGKOLA BARAT KABUPATEN TAPANULI SELATAN
Authors: Harahap Mikrajni , Mardhiansyah Muhammad , Darlis Viny Volcherina
Published: May 2022

Salacca sumatrana Becc is one of the  Salacca zalacca which has been widely known to the public, especially in North Sumatra. Sitaratoit village is one of the  Salacca sumatrana Becc producing areas, which each household has  Salacca sumatrana Becc fields planted on its own as well as inherited from the family. The farmers decision on species selection was important as a consideration for developing agroforestry patterns in the future because risk factors were always present in each selection specific tree species. The purpose of this study was to identify the basis component selection of Salacca sumatrana Becc agroforestry based on community perceptions in Sitaratoit Village. The research data was obtained from in-depth interviews conducted in Sitaratoit Village using the purposive sampling method. This research showed that based on cultural, economic and ecological factors, the constituent components of  Salacca sumatrana Becc agroforestry in Siataratoit village were as follows: Salacca sumatrana Becc as the main commodity, Hevea brasiliensis, Durio zibethinus, and Persea americana as a shade tree and protective tree, Gmelina arborea and Toona sinensis as a land divider.
PARTISIPASI MASYARAKAT DALAM PENGELOLAAN HUTAN MANGROVE DI KAMPUNG RAWA MEKAR JAYA KECAMATAN SUNGAI APIT KABUPATEN SIAK
Authors: Tarigan Morista Latersia , Qomar Nurul , Yoza Defri
Published: May 2022

Mangrove forest have a diversity of potential benefits for human life, so they need to be maintained so that their utilization can be sustainable. The surrounding community must be the main actor in the management of mangrove forests so that the benefits can be felt directly by the community. This study aims to determine the level and form of community participation in the management of Mangrove Forests in Rawa Mekar Jaya Village, Sungai Apit District, Siak Regency. Data were collected through observation, closed interviews with 73 respondents, in-depth interviews, and documentation studies. Data were analyzed descriptively qualitatively and processed with percentage techniques. The results showed that 69.87% of respondents had a low level of participation in all stages of mangrove forest management because management tended to be exclusively carried out by the Rumah Alam Bakau Tourism Conscious Group. 71.23% of respondents has a low level of participation at the decision making stage, implementation stage, and evaluation stage. 72.60% of respondents has a low participation rate at the stage of enjoying the results. Respondents who participated highly at every stage of management were those who joined the Rumah Alam Bakau Tourism Conscious Group. Forms of community participation in the management of mangrove forests are contributions of ideas / thoughts, energy, skills, and goods (property).
IDENTIFICATION OF CUSTOMARY RULES IN PRIVATE FOREST MANAGEMENT ON SIHUTINGCUSTOMARY LAND, ARITONANG VILLAGE,MUARA DISTRICT, NORTH TAPANULI REGENCY
Authors: Sianturi Andrian , Mardhiansyah Muhammad , Oktorini Yossi
Published: May 2022

Private forest of Aritonang village is on customary land which is the inheritance of the ancestors in the form of gift/wages by Raja Aritonang to Ompu Guru Sukkunon (a descendant of the Ompusunggu clan) and Ompu Guru Solupa (a descendant of the Rajagukguk clan) are managed based on customary rules. The purpose of this research was to identify the customary rules that apply and to find out the benefits of customary rules in the management of private forests in the customary land of the village of Aritonang. This research was conducted in Aritonang village, Muara Distric, North Tapanuli Regency in April - May 2019. This research used purposive sampling technique to selection of informants. Namely the male lineage and the female lineage of Guru Sukkunon and Guru Solupa who live in hamlet 1 of Aritonang village as much as 36 families, Non-descendant communities Ompu Guru Sukkunon and Ompu Guru Solupa (relatives) who are domiciled in hamlet 1 of Aritonang village as many as 6 families and Batu Binumbun village community who border directly with customary land of Sihuting in Aritonang village as much as 1 family. And this research used qualitative descriptive analysis to analyze the data. Customary rules that apply in the management of Aritonang’s Sihuting private forest cover the process of granting and inheriting management rights of the land land, the time span of use and omission of land, types of plants that are allowed to be planted and/or cared for, yields, establish houses, and determination of sanctions for violators of customary law. The benefits of customary rules in the management of Aritonang’s Sihuting customary forests are the maintenance of order and justice in the process of granting and managing the management rights of customary land.
PEMANFAATAN JENIS TUMBUHAN BERKAYU SEBAGAI BAHAN BAKU KAPAL BOCAI DESA PASIR BONGKAL KECAMATAN SUNGAI LALA KABUPATEN INDRAGIRI HULU
Authors: Hidayatullah Assodiqi , Sribudiani Evi , Somadona Sonia
Published: May 2022

Bocai is a traditional ship which originated from Pasir Bongkal Village, Sungai Lala District, Indragiri Hulu Regency. The type of size of the kid in the sandstone village is very diverse, because the kid is used for several purposes. Distinctive characteristics of the leak can be seen on the front and rear of the blunt, called the threshold, in addition to the characteristics of the hull shape or often referred to as the body of the ship is not fat and wide. In connection with this, research on the use of woody plants as raw material for Bocai vessels in the Sand Bongkal Village, Sungai Lala District, Indragiri Hulu District. The selection of informants was made to shipbuilders and shipowners, using the Purposive Sampling technique. The implementation of this research is divided into several techniques, namely observation and interviews, observations made in this study in the form of data and information consisting of primary and secondary data. The data analysis technique used is the qualitative descriptive analysis method, in the form of woody plant species used by the Sand Bongkal Village community and how to use them. The types of wood that are used in making the ship Bocai Sand Bongkal Village are bungur, cempedak, durian, rengas, red meranti, keruing, and kulim. The technique of making a ship ship first install keel then log, ambang, gading-gading, gading kong, papan, tajuk, pisang-pisang, sente, nage-nage, pulang, dek, pemakalan, gale-gale.
KARAKTERISTIK DAN KESESUAIAN HABITAT RUSA TIMOR (Cervus timorensis) DI UNIVERSITAS RIAU
Authors: Saputra Mandala Yohannes , Yoza Defri , Sribudiani Evi
Published: May 2022

The breeding of Timor deer at the University of Riau was successful due to the high adaptability of the Timor deer outside their habitat. Maintaining the success of Timor deer breeding at the University of Riau the need for direct observation of the environment and the availability of food at the likely location of Timor deer breeding to avoid undesirable things. This research was conducted to be a reference for better management of Timor Deer's breeding efforts at the University of Riau. The materials and tools used are moisture meters, measuring instruments, cameras, compasses, tape measures, ropes, pH meters and clinometers. The method of investigation used is the census method using the path system. The study area of 2.07 ha with the census method records the water conditions, the topography, the protection of the canopy, the vegetation, the temperature and the humidity, which were not previously known. For an investigation area of 2.07 ha, a plot of 20 m width and 5000 m length is needed by drawing a line of intersection for population indications observed in the prospective breeding area. The results showed that the physical location of the potential stag breeding at Riau University could very well be determined and developed as a breeding ground for Timor stags. Suitability of Timor-Deer habitat (Cervus timorensis) at potential breeding grounds of the University of Riau supports various forest types, shade trees, feed types, roofing stratification and plant vegetation for the Timor-Deer breed (Cervus timorensis). The availability of biotics in breeding candidates is considered appropriate for the survival of the Timor-deer.
PERSEPSI PARA PIHAK TERHADAP KEARIFAN LOKAL MASYARAKAT DALAM MELESTARIKAN HUTAN DI KENEGERIAN ROKAN KECAMATAN ROKAN IV KOTO KABUPATEN ROKAN HULU
Authors: Izzati Mawaddatun , Mardhiansyah Muhammad , Sribudiani Evi
Published: May 2022

Kearifan lokal berguna sebagai pengetahuan hidup maupun sebagai perilaku manusia dalam melestarikan lingkungan. Kearifan lokal dalam melestarikan hutan sudah berkurang, keberadaan hutan di Kenegerian Rokan semakin menurun. Penelitian ini bertujuan untuk mengetahui persepsi para pihak terhadap kearifan lokal masyarakat Rokan dalam melestarikan hutan di Kenegerian Rokan. Metode pengambilan sampel menggunakan teknik porposive sampling sebanyak sepuluh responden. Data dianalisa secara deskriptif kualitatif. Hasil penelitian menunjukkan bahwa kearifan lokal sudah tidak dijaga dengan baik dan tidak berlaku lagi. Tokoh masyarakat yang berperan di Kenegerian Rokan adalah tokoh adat, tokoh agama dan tokoh pendidikan. Banyaknya tokoh masyarakat yang mementingkan kepentingannya sendiri dan memberlakukan sanksi yang tidak tegas, telah membuat masyarakat tidak peduli satu sama lain dan menimbulkan banyak konflik. Hal ini menimbulkan ketidakpercayaan masyarakat terhadap Ninik Mamak selaku tokoh masyarakat dan menyebabkan masyarakat tidak lagi menjaga dan memelihara kelestarian hutan.
VALUASI EKONOMI AREN (Arenga pinnata MERR) DI DESA KIYAP JAYA KECAMATAN BANDAR SEIKIJANG KABUPATEN PELALAWAN PROVINSI RIAU
Authors: Afifa Morina Widya , Oktorini Yossi , . Mukhamadun
Published: May 2022

Aren (Arenga pinnata Merr) was one of the non-wood forest products that could be used start from sap, fruit, palm fiber, stems, leaves, and roots. Almost all products have economic value. This research was to study the benefits and have the economic values in Kiyap Jaya Village, Bandar Sei Kijang District, Pelalawan Regency, Riau Province. This recearch used a qualitative descriptive method by using economic analysis by asking for market prices and obtaining productivity. The sugar palm parts that are truly utilized by the community are roomie, fruit, and roots. As for the fibers, the stems and leaves has not been maximally utilized. The sap was used as an alternative medicine for diabetes mellitus and kidney failure. The Fruit was useful as a mixture of food and roots that are used as a tonic and urinary stones. The total economic value in the Kiyap Jaya Village was Rp. 31,450,000 per stem in one year, which was the highest economic value in the room of Rp. 25,550,000 per-month.
KARAKTERISTIK GLULAM BAMBU APUS (Gigantochloa Apus) MENGGUNAKAN PEREKAT STYROFOAM BERDASARKAN JUMLAH DAN POLA PEYUSUNAN LAPISAN
Authors: Putra Rezki Bela , Sribudiani Evi , Somadona Sonia , . Pebriandi
Published: May 2022

Wood was a construction raw material that has long been developed before the advent of concrete and steel technology. The need of wood raw materials for construction was increasingly increasing while the availability of high quality wood was increasingly scarce. Therefore, in order to meet this an effort was needed to produce raw materials to replace wood, its was the development of laminated products or glulam made of bamboo apus (Gigantochloa apus) as structural and construction materials. Based on this, this study was conducted to determine the quality of glulam from Gigantochloa apus by using styrofoam adhesives based on number and pattern of layer arrangement. Sample was made of Gigantochloa apus with sized 30cm × 10cm arranged with the number and pattern of layer arrangement that have been determined. This study uses a complete randomized design combination with two treatments. Factor A was the number of layers (three layers, four layers and five layers) and factor B was the arrangement pattern (diagonal, horizontal and vertical). The physical and mechanical properties of glued laminated beams of Gigantochloa apus were tested based on JAS 234: 2003 Standard. The results showed that the quality of glulam met the physical properties of moisture content. While the mechanical properties of MOE and MOR did not meet the standards, so they did not be use as structural materials. Combination with horizontal, diagonal and horizontal lamina arrangement patterns gives the best results on the mechanical properties of glulam.
Abundance and Distribution Patterns of Gastropods in the Intertidal Bay of Kambang Lengayang Sub-District, Southern Coastal District, West Sumatera
Authors: Harif Ichwanul , Tanjung Afrizal , Elizal Elizal
Published: May 2022

This study aims to determine the abundance and distribution pattern of gastropods in the intertidal bay, Kambang Lengayang District, Pesisir Selatan Regency, West Sumatra. The benefits of this research are expected to be a reference or information for further research in Kambang Bay which in the end is expected to minimize the adverse effects of gastropod hunting. The research method used in this study is a survey method, namely direct observation and sampling which is divided into 3 stations where the sampling station 1 is taking in the coastal waters of the bay in an area where there is no community activity, station 2 is taking in the waters of the bay in the fishing trawl area. station 3 taking in the coastal waters of Kambang in the reclamation area. Based on the analysis of organic sedimentary material in the study area, the average value was obtained at station 1 (3.55%), station 2 (4.20%) and station 3 (3.33%). Based on the analysis, the sediment fraction that dominates each station is sand. The gastropods found at the study site were Clypeomorus bifasciata, Littoraria scabra and Cerithulata cingulata. The abundance of gastropods in the coastal waters of Kambang ranged from 2.33 to 5.00 Ind/m2. The results of the ANOVA test showed that the abundance of gastropods in the bay waters showed 0.214 beaches, indicating that the difference in abundance between stations was not significant. The gastropod pattern found at the study site is generally in groups.
Genetic Change of Pharella acutidens Influenced by Pb and Cd Metals in Rupat Strait Waters
Authors: Ginting Tri Vani Bernadetha , Nasution Syafruddin , Effendi Irwan
Published: May 2022

Rupat Strait related to the Strait of Malacca is a national and international shipping lane and makes the region affected by anthropogenic activities that result in a decrease in the quality of the waters such as the increasing amount of heavy metal content. The most easily contaminated  organism of heavy metals is bivalves due to and its low mobility, bivalves being filter feeders, and the ability to accumulate contaminants,. The purpose of  this study was to look at genetic changes in bivalves  (P.acutidens) contaminated by heavy metals. The study was conducted from February to March 2021. Bivalve sample was collected from the waters of Rupat Strait and sample analysis was conducted in the Marine Biology Laboratory and Genetics Laboratory of Riau University. Bivalve DNA is isolated with Geneaid Tissue Genomic DNA Mini Kit. DNA isolation results were then carried out PCR process and sequencing process was carried out in PT. Genetika Science Indonesia. The results of study show that sequencing results obtained by samples derived from Selinsing have the most changes in the composition of nitrogen bases compared to samples from the other two stations.
Analysis of Microplastics on Sediments in the Waters of Selat Panjang of Tebing Tinggi Subdistrict, Meranti Islands Regency, Riau Province
Authors: Pasaribu Ridwan Saiful Basri , Nedi Syahril , Elizal Elizal
Published: May 2022

The study was conducted from March to May 2021 which aims to identify the types, abundance of microplastics and compare the abundance of microplastics between stations in the waters of the Long Strait of High Cliff Subdistrict. Survey methods are applied and PVC pipes are used to collect sediment samples from three different stations with three sampling points at each station. The types of microplastics found are fragments with the most jumblah with film and fiber. The most widely found types are fragments, followed by film and fiber. The abundance of microplastics at Tanjung Harapan Port (5900.00 partkels /kg of dry sediment) is higher than the mouth of the Dorak coastal river (5306.67 partkels/kg of dry sediment) and Banglas Village Mangrove Ecotourism (4120.00 partikels/kg of dry sediment). The results showed that the abundance of microplastics between stations differed significantly. Microplastic differences based on further independent test samples t-test showed that each station compared to mangrove ecotourism area will be significantly different, while between Tanjung Harapan Port and the mouth of the Dorak coastal river showed no significant difference