bluuebunny/crossref_metadata_2025 huggingface dataset:
Kemampuan Penalaran Matematis Siswa Melalui Model Discovery Learning Di Sekolah Menengah Aceh
Authors: Zubainur Cut Morina , Jannah Raudhatul , Syahjuzar Syahjuzar , Veloo Arsaythamby
Published: May 2020

Tujuan dari penelitian ini adalah untuk menyelidiki perkembangan kemampuan penalaran matematis siswa melalui Model Discovery Learning di SMPN 6 Banda Aceh.Penelitian ini menjalankan pendekatan kuantitatif dan kualitatif secara bersama-sama (mix method) dengan jenis penelitian Concurrent Triangulation Strategy.Populasi penelitian yaitu seluruh siswa kelas VIII-4 SMPN 6 Banda Aceh yang berjumlah 30 siswa. Sedangkan sampel penelitian yaitu lima siswa yang terdiriatas satu kelompok belajar yang dipilih secara random dari enam kelompok belajar.Data kemampuan penalaran matematis siswa dikumpulkan melalui tes kemampuan penalaran matematisdan wawancara semi terstruktur.Data kemampuan penalaran matematis siswa yang diperoleh selanjutnya dianalisis dengan melihat kesesuaian data tes dengan wawancara dan relevansinya dengan indikator kemampuan penalaran matematis.Hasil penelitian menunjukkan bahwa kemampuan penalaran matematis siswa melalui Model Discovery Learning berkembang secara bervariasi.Pada awal penerapan model siswa kesulitan mengembangkan kemampuannya.Hal ini disebabkan karena siswa belum terbiasa dengan kegiatan pembelajaran yang dilaksanakan berdasarkan sintaks Model Discovery Learning.Siswa terbiasa menerima materi dari guru dalam bentuk jadi.Upaya guru memotivasi dan menggali keberanian siswa pada akhirnya dapat membantu siswa mencapai tujuan pembelajaran dan mengembangkan kemampuan penalaran matematis.Implikasi penelitian ini yaitu penerapan Model Discovery Learning dapat mengembangkan kemampuan penalaran matematis siswa. Guru hendaknya memperluas penerapan model pembelajaran tersebut untuk materi matematika lainnya dengan harapan dapat meningkatkan kemampuan penalaran matematis siswa.
Иглоукалывание в профилактике, лечении травм и улучшение производительности у спортсменов: Обзор литературы
Authors: Junior Julio Cesar Dias
Published: May 2020

Исследования показали, что иглоукалывание улучшает физическую работоспособность у профессиональных спортсменов, но большой проблемой является спортивные травмы, которые могут оставить их вдали от деятельности в течение длительного времени. В ходе исследования был проведен обзор литературы, в ходе которой была изыскивать эффективность метода в профилактике, повышении производительности и лечении поражений. Некоторые авторы иллюстрируют и разъясняют процесс нейрофизиологии боли и то, как иглоукалывание может вмешиваться в эту проблему, другие, разработать и применять протоколы для достижения улучшения производительности, лечения заболеваний и профилактики Травмы. Среди результатов были найдены восемьдесят девять статей на эту тему, где: двадцать два сообщили лечения поражений и тридцать семь профилактики и улучшения спортивных результатов, направляя применение один раз в неделю, 20 – 30 минут, представляя удовлетворительные результаты для проанализированных данных. Основываясь на этой литературе и научно-обоснованной практике можно сделать вывод, что иглоукалывание является большим вмешательством для достижения этих целей в области спорта.
Agrarian Nationalism or “Imperial” Science? “El Sabio” Moisés S. Bertoni and Paraguayan Agricultural Science
Authors: Wilcox Robert
Published: May 2020

Abstract: As a contribution to recent discourse over the practice of natural science in Latin America’s liberal years, this paper examines Swiss-born botanist Moisés S. Bertoni’s place in Paraguay’s agricultural development following the Paraguayan War (1864-70). The war forced leaders in a devastated Paraguay to promote the immigration of European scientific experts and farmers, with the expectation that their knowledge of modern agricultural science and practice would revitalize the nation’s agriculture and lift Paraguay out of its poverty. From the late nineteenth century Bertoni’s work and knowledge of Paraguay’s tropical and semi-tropical climate and botany shaped much of Paraguayan agricultural policy and practice. And while his contributions were influential in understanding the nation’s environment and agriculture, what is unclear is how much his approach was the product of deliberate introduction of European agricultural science or the result of autochthonous experience and his own trial and error.

Keywords: agricultural science; natural science; Paraguay; tropical climate
Gerd Kohlhepp e as heranças da geografia alemã para os estudos de colonização e desenvolvimento no Brasil
Authors: Dutra e Silva Sandro , Bell Stephen
Published: May 2020

Entrevista com o geógrafo alemão Gerd Kohlhepp concedida ao Editor Chefe de HALAC, Prof. Sandro Dutra e Silva (Anápolis, Goiás, Brasil, em 24 de outubro de 2018), com introdução de Stephen Bell.
Field Investigations on the Effects of Track Lateral Supports on the Ballasted Railway Lateral Resistance
Authors: Zakeri Jabbar Ali , Alizadeh Galdiani Milad , Mosayebi Seyed Ali
Published: May 2020

Lateral movements of the ballasted railway track especially in the continuous welded rail (CWR) occur in sharp curves because of high lateral forces. Several strategies have been proposed to increase the track lateral resistance which most of them related to track curves with small radii. In this paper, track lateral supports as a new method have been utilized and a series of field tests have been conducted by using the Single Tie Push Tests (STPT) and Multi Tie Push Tests (MTPT) and their results are compared with the numerical modeling. The results of numerical modeling and field tests show that the track lateral resistance significantly increases in the railway with lateral supports, so that the lateral displacements of track are as a bilinear form.
Ylirajaiset venäläiset nykykirjailijat Suomessa
Authors: Sorvari Marja
Published: May 2020

Artikkelini keskittyy kirjallisuuden ylirajaisuuteen ja erityisesti venäjänkielisiin kirjailijoihin, jotka asuvat kotimaansa ulkopuolella ja kirjoittavat muulla kuin äidinkielellään. Käsittelen kahta Suomessa asuvaa venäjänkielistä kirjailijaa, Zinaida Lindéniä ja Polina Kopylovaa, jotka kirjoittavat kaunokirjallisia tekstejä ruotsiksi ja venäjäksi sekä suomeksi ja venäjäksi. Tarkastelen, miten he lähestyvät monikielistä luomisprosessia, mitä heille merkitsee kirjoittaminen kahdella kielellä ja miten se heijastuu heidän kaunokirjallisissa teksteissään. Tarkasteluni pohjautuu kirjallisuuden ylirajaistumiseen liittyvään tutkimukseen ja siinä esiin nostettuihin ajatuksiin kansallisten kirjallisuuksien monikielisyydestä ja kulttuurienvälisyydestä. Tutkimusaineistona ovat kirjailijoiden kaunokirjalliset tekstit sekä kirjailijahaastattelut.

 

Contemporary Translingual Russian Writers in Finland

The article deals with literary translingualism, and especially Russian-speaking writers who live outside their home country and write in a language other than their mother tongue. The article discusses the ideas that literary translingualism evokes about language, literature, and identity and deals with two Russian-speaking writers, Zinaida Lindén and Polina Kopylova, who live in Finland and write in Swedish and Russian, and in Finnish and Russian, respectively. The article discusses how the writers approach their multilingual creative process and how it is reflected in their literary texts and interviews.
Repressiot Venäjän historiapolitiikassa 2008-2018
Authors: Ruotsalainen Lotta
Published: May 2020

Artikkeli käsittelee Venäjällä vuosina 2008–2018 tehtyä poliittisten repressioiden historiapolitiikkaa. Tarkoitus on tarkastella sitä, miten Venäjän valtio on presidentillisissä kannanotoissaan käyttänyt repressioiden muistoa poliittisiin ja yhteiskunnallisiin tarkoituksiin, ja sitä, miten valtiojohtoinen historiapoliittinen toiminta on heijastunut kansalaisjärjestö Memorialin ja Venäjän ortodoksisen kirkon poliittisten repressioiden historiapolitiikkoihin. Tutkimuksen aineisto koostuu Venäjän presidenttien tekemistä historiapoliittisista kannanotoista ja poliittisten repressioiden historiapolitiikkaa käsittelevistä, verkossa julkaistuista uutisteksteistä. Repressiohistorian aktiivisen hyödyntämisen avulla pyritään edistämään presidentinhallinnolle tärkeitä arvoja. Tällaisia ovat esimerkiksi vahva valtio, kansallinen yhtenäisyys ja nykyisen hallinnon legitimiteetin tukeminen. Huomionarvoista on, että valtiolla näyttäisi olevan voimistuva pyrkimys rajoittaa ja kontrolloida itsestään riippumatonta repressioiden historiapolitiikkaa. Tämä näyttäisi liittyvän kiinteästi samanaikaiseen yhteiskunnan autoritaaristumiskehitykseen.

 

Memories of Political Repressions in Post-Soviet Russia during 2008–2018

The article discusses political repressions and the politics of memory in Post-Soviet Russia during the period 2008–2018. The aim is to explore how the Russian state has been putting the memory of political repressions to use. The primary data consists of presidential statements and news articles that address the history of political repressions. The memory of political repressions is actively employed to claim political legitimacy, a strong state and national unity. Further research is required to provide more detailed information about the state trying to achieve control over memories that are not dependent on the Russian state. Bearing in mind the recent discussion about the re-authorization of Russian society, this seems to be no accident.
Repositorios y redes sociales académicas, dos vehículos para un mismo conocimiento científico
Authors: López-Borrull Alexandre
Published: May 2020

Se presenta una contribución al debate sobre los repositorios y las redes sociales académicas. Según la visión del autor, son herramientas complementarias en un mundo marcado por la presión por publicar y conseguir más impacto. Se presentan algunas de las cuestiones a considerar en el debate, como la privacidad, los modelos de negocio, la ciencia abierta y el academic search engine optimization (ASEO).
El liderazgo como herramienta de gestión de calidad en las sociedades mineras: caso Bella Rica
Authors: Puglla-Torres Luz , Paucar-Alomoto Jhon , Romero-Black Wilton
Published: May 2020

El presente trabajo analiza que las empresas mineras son considerados el sector industrial de mayor atención, debido a la producción y la mejora de la economía, pero así como todas las empresas necesitan tener modelos que ayuden a mejorar la calidad, en este caso su enfoque es en el área de la producción, ya que quienes practican esta actividad de manera artesanal no cuentan con los conocimientos adecuados de planificación, organización, control y evaluación; la presente investigación tiene como objetivo el análisis de calidad teniendo al liderazgo como herramienta de gestión de calidad según las ISO 9001: 2015 del acápite cinco de liderazgo y compromiso, tomando como muestra los grupos mineros de las distintas sociedades de la Cooperativa Minera bella Rica, el análisis aplicado es mediante el modelo servqual basada en dimensiones que permitirá evidenciar las deficiencias en la gestión de la producción.
Global GAP y su complemento GRASP: Filosofía de Responsabilidad Social Empresarial del Sector Agroalimentario
Authors: Nivelo-Nagua Karen , Pacheco-Molina Andrés , Pupo-Francisco Juan
Published: May 2020

Global GAP es considerada una norma mundial para las Buenas Prácticas Agrícolas, añadiendo en sus últimos años por las exigencias del mercado un complemento adicional a su normativa, conocido como GRASP (Evaluación de Riesgos para las Prácticas Sociales), mismos que evalúan temas específicos como la salud, seguridad y bienestar de los trabajadores. El objetivo de este artículo es identificar la incidencia de la aplicación de la normativa Global GAP y su complemento GRASP en el cumplimiento de la filosofía de responsabilidad social empresarial para la integración de sostenibilidad del sector agroalimentario. Se aplicó un instrumento de investigación basado en 13 indicadores claves que permitieron analizar la percepción de 384 trabajadores u obreros con respecto a normativas que conjugan tanto el cumplimiento de la norma como de la responsabilidad social y empresarial. Los resultados demuestran el compromiso del sector agroalimentario en mejorar las condiciones y calidad de vida de los trabajadores a raíz de su certificación, permitiéndose a ellos mismos crear sostenibilidad y ser parte de un mercado internacional.
Caracterización de feldespato Ecuatoriano por técnicas analíticas instrumentales y cálculo estadístico de incertidumbre para la fiabilidad de resultados
Authors: Moreno-Barriga Monica , Noguera-Cundar Andrés , Castro-Cepeda Lidia
Published: May 2020

El presente estudio tiene como objetivo el análisis y caracterización de una muestra de un feldespato ecuatoriano, mediante técnicas de DRX, SEM y TGA, para el análisis microestructural de fase mineral y composición química. Los análisis de difracción de rayos X cualitativo y cuantitativo mediante el refinamiento de Rietveld, revelaron que este feldespato está compuesto por 33,31% de Albita, 15,70% de Cuarzo y un gran porcentaje en peso de 50,99% de material amorfo. Para validar estos resultados se investigó y calculó la incertidumbre de la medida, mediante análisis estadístico de desviación estándar, dando como resultados un error de incertidumbre de ±0,87wt%, ±0,23wt% y ±0,89wt% respectivamente para los porcentajes en peso de los minerales encontrados en este análisis. El resultado mediante SEM muestra la presencia de Albita en el feldespato exhibiendo hermanamiento laminar y caracterizada por inclusiones de cuarzo y plagioclasa esféricas que se dispersan al azar.
Merchandising: un factor invisible en la industria turística
Authors: Muso-Guagchinga Erika , Mancheno-Saá Marcelo , Quisimalín-Santamaría Hernán
Published: May 2020

El sector turístico es una de las principales fuentes económicas del país, aparte que contribuye en la generación de trabajo de varias familias y miles de personas, este monto asciende a 137,647 personas dedicadas a la prestación de servicios en los establecimientos turísticos, siendo así, el 52,8% que corresponde a hombres, mientras que el 47,2% pertenece a mujeres. Este sector es muy dinámico, aportando con el 1,5% al Producto Interno Bruto (PIB). El objeto de esta investigación se basa principalmente en caracterizar el término merchandising en la provincia de Tungurahua, para identificar su relación en las oficinas de las agencias de viajes, y la forma en que estos transmiten una imagen adecuada de la marca de modo que incentive la compra. El método de investigación se efectuó a través de dos enfoques, cualitativo y cuantitativo, el primero hace referencia a una investigación documental o bibliográfica, mientras que la segunda a una investigación de campo, implementado a través de dos instrumentos de investigación, a las agencias de viajes y a los consumidores o turistas. Del análisis realizado se observó que la dimensión social se destaca en el punto de venta, ya que el comportamiento de los agentes turísticos y clientes, son trascendentales para cerrar la venta. Además, se identificó que los administradores desean cambiar la infraestructura como un factor clave para fortalecer su imagen y diferenciarse de la competencia. El manejo apropiado de la gestión comercial en el punto de venta, maximiza el nivel de ventas y logra una mayor interacción con los turistas.
48 / XXYY MALE CASE WITH PRIMARY INFERTILITY
Authors: BALKAN Mahmut , ORAL Diclehan , TEKEŞ Selahattin , ŞİMŞEK Selda , TÜRKYILMAZ Ayşegül , YÜCEL İlyas , BİNİCİ Mahir , KOCA Zeynep , GÜZEL ERDAL Gülbahar
Published: May 2020

Klinefelter syndrome is a sex chromosomal aneuploidies with at least one extra X chromosome than normal male karyotype. The classic form of the 47 / XXY karyotype, the incidence of this syndrome is one in 500-1000 live male births. The incidence of 48 / XXYY male individuals with many phenotypic features of Klinefelter syndrome is extremely rare and occurs in 1: 18000 -1: 100.000 men. However, they differ from Klinefelter syndrome with serious behavioral problems, mental reterdation and susceptibility to psychiatric diseases [1 ]. A 38-year-old man, referred to our Medical Biology and Genetics laboratory for karyotype analysis with primary infertility. He had undergone varicocele surgery and had high levels of FSH, low levels of testosterone and high levels of LH. Semen analysis demonstrated azoospermia In the psychiatric examination of the patient, whose IQ level was 90, language, learning and behavior disorder were diagnosed. The patient with deep vein thrombosis was recommended angiography because of right heart failure. Karyotype analysis revealed with 48,XXYY. This rare case shows the importance of karyotype analysis in diagnosis. In this study, the clinical and laboratory findings of the case are presented with the literature.
SOCIAL DETERMINANTS OF HEALTH AFFECTING UTILIZATION OF MATERNAL HEALTH SERVICES IN AFRICA: A NARRATIVE REVIEW
Authors: MUSIZVINGOZA Ronald
Published: May 2020

Despite improvements in maternal health, Sub-Saharan Africa countries still experience high maternal deaths. The provision of quality maternal health services has been adopted as a key strategy to reduce maternal mortality. However, low utilization rates and inequitable access to maternal health services across the region continue to hinder progress. The objective of the study was to synthesize evidence on the social determinants of maternal health services utilization in sub-Saharan Africa. A narrative review of peer-reviewed articles published between 2010 and 2019 was conducted. Peer-reviewed published studies were electronically searched from databases using search terms covering access and use, social determinants, maternal health services and sub-Sharan Africa. Data were qualitatively analyzed, and results summarized using the World Health Organization’s Social Determinants of Health Framework. A total of 36 studies were reviewed. The study identified several social determinants that act as barriers or facilitators to maternal health utilization. Factors identified include socioeconomic status, educational level, women’s autonomy, urban residence, gender norms, geographical proximity, access to media, high social capital, social support, exposure to media and functional health system. Maternal healthcare utilization is still low in sub-Saharan Africa and it reflects disparities according to socioeconomic status and rural/urban residence. Programs and interventions to improve maternal health should target social determinants that create inequalities in society.
Submergence, nutrient enrichment, and tropical storm impacts on Spartina alterniflora in the microtidal northern Gulf of Mexico
Authors: Hill JM , Petraitis PS , Heck KL
Published: May 2020

Salt marshes face chronic anthropogenic impacts such as relative sea level rise and eutrophication, as well as acute disturbances from tropical storms that can affect the productivity of these important communities. However, it is not well understood how marshes already subjected to eutrophication and sea level rise will respond to added effects of episodic storms such as hurricanes. We examined the interactive effects of nutrient addition, sea level rise, and a hurricane on the growth, biomass accumulation, and resilience of the saltmarsh cordgrass Spartina alterniflora in the Gulf of Mexico. In a microtidal marsh, we manipulated nutrient levels and submergence using marsh organs in which cordgrasses were planted at differing intertidal elevations and measured the impacts of Hurricane Isaac, which occurred during the experiment. Prior to the hurricane, grasses at intermediate and high elevations increased in abundance. After the hurricane, all treatments lost approximately 50% of their shoots, demonstrating that added nutrients and elevation did not provide resistance to hurricane disturbance. At the end of the experiment, only the highest elevations had been resilient to the hurricane, with increased above- and belowground growth. Added nutrients provided a modest increase in above- and belowground growth, but only at the highest elevations, suggesting that only elevation will enhance resilience to hurricane disturbance. These results empirically demonstrate that S. alterniflora in microtidal locations already subjected to submergence stress is less able to recover from storm disturbance and suggests we may be underestimating the loss of northern Gulf Coast marshes due to relative sea level rise.
Impact of perinatal hypoxia on the developing brain
Authors: Piešová M. , Mach M.
Published: May 2020

Perinatal hypoxia is still one of the greatest threats to the newborn child, even in developed countries. However, there is a lack of works which summarize up-to-date information about that huge topic. Our review covers a broader spectrum of recent results from studies on mechanisms leading to hypoxia-induced injury. It also resumes possible primary causes and observed behavioral outcomes of perinatal hypoxia. In this review, we recognize two types of hypoxia, according to the localization of its primary cause: environmental and placental. Later we analyze possible pathways of prenatal hypoxia-induced injury including gene expression changes, glutaminergic excitatory damage (and a role of NMDA receptors in it), oxidative stress with ROS and RNS production, inflammation and apoptosis. Moreover, we focus on the impact of these pathophysiological changes on the structure and development of the brain, especially on its regions: corpus striatum and hippocampus. These brain changes of the offspring lead to impairments in their postnatal growth and sensorimotor development, and in their motor functions, activity, emotionality and learning ability in adulthood. Later we compare various animal models used to investigate the impact of prenatal and postnatal injury (hypoxic, ischemic or combinatory) on living organisms, and show their advantages and limitations.
Enhancing Laptop Security Policy using RiskIT Framework
Authors: Wijaya Andy , Soetomo Mohammad Amin
Published: May 2020

The usage of laptop as replacement of PC for staff mobility has been continuing to increase for many companies. In the same time the threats related to the use of laptops has evolving due to technology and internet growth. To protect the corporate information, the policy of the laptop is become mandatory to continuously reviewed and enhanced. This paper explains the enhancement of laptop security policies. ISACA Risk IT Framework is used as the methodology. It is expected that the latest security risks (from social engineering to cyber risk) facing by the company are mitigated. New set of policies are suggested. It covers process, people and technology.
Implementation of data mining as a support of business application strategy
Authors: Damayanti Florensia Unggul
Published: May 2020

Data mining help industries create intelligent decision on complex problems. Data mining algorithm can be applied to the data in order to forecasting, identity pattern, make rules and recommendations, analyze the sequence in complex data sets and retrieve fresh insights. Yet, increasing of technology and various techniques among data mining availability data give opportunity to industries to explore and gain valuable information from their data and use the information to support business decision making. This paper implement classification data mining in order to retrieve knowledge in customer databases to support marketing department while planning strategy for predict plan premium. The dataset decompose into conceptual analytic to identify characteristic data that can be used as input parameter of data mining model. Business decision and application is characterized by processing step, processing characteristic and processing outcome (Seng, J.L., Chen T.C. 2010). This paper set up experimental of data mining based on J48 and Random Forest classifiers and put a light on performance evaluation between J48 and random forest in the context of dataset in insurance industries. The experiment result are about classification accuracy and efficiency of J48 and Random Forest , also find out the most attribute that can be used to predict plan premium in context of strategic planning to support business strategy.
Forensic Analysis of Artifacts of Giant Instant Messaging “WhatsApp” in Android Smartphone
Authors: Ghannam Hussein Abed
Published: May 2020

WhatsApp is a giant mobile instant message IM application with over 1billion users. The huge usage of IM like WhatsApp through giant smart phone “Android” makes the digital forensic researchers to study deeply. The artefacts left behind in the smartphone play very important role in any electronic crime, or any terror attack. “WhatsApp” as a biggest IM in the globe is considered to be very important resource for information gathering about any digital crime. Recently, end-to-end encryption and many other important features were added and no device forensic analysis or network forensic analysis studies have been performed to the time of writing this paper. This paper explains how can we able to extract the Crypt Key of “WhatsApp” to decrypt the databases and extract precious artefacts resides in the android system without rooting the device. Artefacts that extracted from the last version of WhatsApp have been analysed and correlate to give new valuable evidentiary traces that help in investigating. Many hardware and software tools for mobile and forensics are used to collect as much digital evidence as possible from persistent storage on android device. Some of these tools are commercial like UFED Cellebrite and Andriller, and other are open source tools such as autopsy, adb, WhatCrypt. All of these tools that forensically sound accompanied this research to discover a lot of artefacts resides in android internal storage in WhatsApp application.
DAMPAK SALURAN TRANSMISSI TEGANGAN EKSTRA TINGGI 500 kV PADA KENDARAAN TANGKI PEMBAWA BAHAN BAKAR FLAMMABLE
Authors: Utama Budi
Published: May 2020

Abstraks                                Telah dikerjakan suatu simulasi komputer melalui program Matlab dalam penentuan tegangan pe nyalaan (Igition Voltage) utk kendaraan tangki pembawa bahan bakar cair (Premium dan Liquified Petro leum Gas, LPG). Juga telah dihitung nilai tegangan terbuka yang ditimbulkan oleh intensitas medan listrik, serta membadingkan tegangan penyalaan yang dimiliki oleh tangki dengan tegangan terbuka yang muncul ketika kendaraan tangki melewati kawasan bermedan listrik. Objek penelitian terdiri dari 3 unit kendaraan tangki pembawa bahan bakar masing masing dengan kapasitas volume 5 000 liter dan 16 000 liter isi bahan bakar jenis premium dan  9 500 kg isi bahan bakar jenis LPG.  Hasil penelitian menunjukan bahwa tegangan penyalaan yang dimiliki oleh masing masing tangki adalah : 3014.15 Volt utk tangki 5 000 liter isi premium, 2 773 Volt utk tangki 9 500 kg  isi LPG dan 2 818.66 Volt utk tangki 16 000 liter isi premium. Terungkap dalam penelitian bahwa kendaraan tangki gas LPG kapasitas volume 9 500 kg mempunyai batasan tegangan penyalaan paling rendah, yaitu sebesar 2 773.93 Volt dgn medan listriknya 2 042.66 V/m.
GRANULOMETRIC MODELS OF ZARIA BANTAMENSIS BEDS AT BOJONG AND BAYAH AREA, IN BANTEN PROVINCE
Authors: Pandita Hita
Published: May 2020

Several research on mollusk fossils have been done in Indonesia. So far research was focused in the identification of species. Although thestudy ofrelationshipsbetween mollusks fossilsand their environment is important, only a few studies have been carried out it in Indonesia. The present study is aimed to reveal the relationships of genus Zaria appearance and sedimentation mechanism and expected to provide an overview of environmental model of Zaria. The methods used are field surveys, laboratory analysis and identification of morphological character of Zaria. Field surveys were conducted in two sites of discovery of Zaria bantamensis fossil in Bayah and Bojong areas. Laboratory work composes of granulometricand statistical analysis of biometric Zaria.The results showed that Zaria bantamensis appeareancewas associated with the rocks of poor sorting characteristics, with medium to fine sand grain sizes. Based on Visher curve the sedimentation mechanism of Bojong samples was dominated by saltation and in Bayah samples was thesuspensions. The results also indicate a possible relationship between shell length and sedimentation mechanism conditions.
KAJIAN PENENTUAN LETAK SARINGAN PADA SUMUR BOR DAN DESAIN KONSTRUKSINYA DI AREA KAMPUS INSTITUT TEKNOLOGI SUMATERA (ITERA)
Authors: Setiawan Muhamad Ragil
Published: May 2020

Air bersih merupakan kebutuhan dasar yang diperlukan dalam melakukan setiap aktivitas. ITERA sebagai sebuah perguruan tinggi dengan segala aktivitas pembelajarannya pun tidak lepas dari kebutuhan air bersih. Seiring dengan pesatnya perkembangan kampus, ITERA juga membutuhkan perencanaan dalam penyediaan air bersih, salah satunya dengan melakukan kajian terhadap bentuk konstruksi sumur bor air tanah. Hal ini dilakukan karena air tanah merupakan salah satu penyedia air bersih untuk kegunaan dalam jumlah yang besar dan harus dikelola dengan baik. Penelitian ini mengkaji bentuk konstruksi dan letak saringan yang tepat pada sumur bor dengan melihat kondisi geologi dan hidrogeologi serta posisi akuifer. Berdasarkan kajian yang dilakukan, kondisi geologi daerah penelitian berada pada Formasi Lampung dengan dominasi litologi Tuf. Adapun posisi akuifer ditemukan pada kedalaman 6,8 meter. Sehingga, letak saringan dalam pembuatan sumur bor sebaiknya berada pada kedalaman 20-25 meter dan 40-50 meter. Filter yang dibuat pada dua kedalaman ini merupakan langkah antisipasi jika air tanah mengalami kekeringan selama musim kemarau.

 

Kata kunci: ITERA, air bersih, akuifer, sumur bor.
REKONSTRUKSI BIDANG GELINCIR LONGSOR DENGAN METODE GEOLISTRIK DI KAWASAN TAMAN NASIONAL TAIPINGSHAN, PROPINSI YILAN, TAIWAN
Authors: Zamroni Akhmad
Published: May 2020

Longsor di Taipingshan terjadi karena Angin Topan Saola pada tahun 2012. Curah hujan yang tercatat dalam peristiwa itu adalah lebih dari 1800 mm selama tiga hari. Selain itu, faktor geologi seperti material yang lapuk dan erosi juga merupakan faktor pendukung terjadinya longsor di daerah tersebut. Geolistrik adalah metode geofisika yang menggunakan arus listrik yang diinjeksikan ke dalam batuan untuk mendapatkan nilai resistivitas. Fungsi geolistrik adalah untuk menentukan jenis material di bawah permukaan berdasarkan nilai resistivitas, yang dilakukan dengan mengukurnya di atas permukaan tanah. Jenis-jenis material tanah longsor di daerah ini hanya satu jenis batuan, yaitu slate. Perbedaan nilai resistivitas (adanya perbedaan warna dalam gambar resistivitas 2D), karena beberapa faktor, seperti batuan yang lapuk dan segar, zona rekahan pada batuan, dan kontak batuan dengan air. Menurut data pemboran, gambar resistivitas 2D, dan Peta Geologi Taipingshan, rekonstruksi profil bawah permukaan dibuat untuk mengetahui kedalaman potensi massa material yang bergerak. Jenis material-material di daerah tersebut adalah colluvium pada kedalaman 0-10 m, slate lapuk pada kedalaman 10-29 m, dan bedrock slate pada kedalaman 29-100 m. Posisi bidang gelincir terletak di antara slate lapuk dan bedrock slate pada kedalaman sekitar 29 m. Bidang gelincir didapatkan dari dua bahan yang berdekatan yang memiliki kontras yang berbeda dari nilai resistivitasnya. Hal tu membuatnya mudah bergerak dan terkikis pada lereng yang curam dan juga pada saat hujan lebat. Sehingga ketebalan potensi massa material yang bergerak adalah sekitar 29 m.
The Teaching Statistic Using Matlab
Authors: Oni Yuliani Oni
Published: May 2020

This paper is to describe the use of Matlab as a scientific tool for the teaching of statistics in undergraduate school. Application of this software in the teaching of some difficult topics like probability concepts, probability distribution, statistical significance, and significance tests, were demonstrated using the Matlab. Matlab has pro­ved it­self to be a ve­ry ef­fec­ti­ve to­ol in the edu­ca­tio­nal pro­cess be­cau­se it of­fers a sim­ple and po­wer­ful to­ol for ana­ly­zing and vi­su­a­li­zing re­sults of nu­me­ri­cal si­mu­la­tions and me­a­sure­ments.
Pengaruh Penambahan Gula Pasir terhadap Waktu Ikat Awal Pasta Semen dan Mortar
Authors: Retno Trimurtiningrum  , Sutriono Bantot , Arrowrichta Billy , Watu Hiasintus Bertus
Published: May 2020

Dalam pelaksanaan konstruksi dengan material beton, seringkali lokasi batching plan berbeda dengan lokasi proyek, sehingga memerlukan waktu dalam pengangkutan materialnya. Untuk mencegah agar material beton tidak mengalami pengikatan terlebih dahulu sebelum dilakukan pengecoran, maka diperlukan bahan tambah kimia untuk memperlambat waktu pengikatan, yaitu retarder. Umumnya, bahan tambah kimia termasuk retarder mempunyai harga yang relatif mahal. Oleh karena itu, dalam penelitian ini digunakan bahan alternatif gula karena gula merupakan salah satu komposisi dalam retarder serta mempunyai harga yang relatif murah dan mudah untuk didapatkan. Persentase bahan tambah gula yang digunakan adalah 0% (sebagai benda uji kontrol); 0,03%; 0,05% dan 0,1%. Pengujian waktu ikat menggunakan peralatan jarum vikat untuk pasta semen dan alat penetration resistance untuk mortar. Hasil pengujian waktu ikat menunjukkan bahwa gula dapat menunda waktu ikat awal pada benda uji pasta semen maupun mortar. Waktu ikat awal terpanjang diperoleh pada campuran G-0,1% yaitu 157,69 menit untuk benda uji pasta semen dan 250 menit untuk benda uji mortar.Kata kunci: waktu pengikatan, gula, pasta semen, mortar
KAJI EKSPERIMENTAL PENGARUH KONDENSAT UNTUK MENDINGINKAN LIQUID LINE PADA CHEST TYPE MINI COOLER DENGAN METODE RADIANT COOLING
Authors: Lukitobudi Arda Rahardja , Luthfi Wendra
Published: May 2020

Pendinginan liquid line dengan kondensat yang dihasilkan pada dinding chest type mini cooler adalah salah satu cara untuk menambah subcool sehingga kapasitas refrigerasi yang dihasilkan akan lebih besar dan dengan demikian akan dihasilkan penghematan energi. Kondensat yang dihasilkan pada chest type mini cooler ini memiliki temperatur yang lebih rendah dari temperatur lingkungan sehingga akan menurunkan temperatur liquid line, dimana kondensat tersebut dialirkan ke tabung tube in tube sepanjang 30 cm dengan diameter 1 inci untuk mendinginkan liquid line. Radiant cooling didapat dengan menanam koil evaporator ke sekeliling dinding kabin yang terbuat dari semen dimana alat ekspansi menggunakan TXV dengan R22 sebagai refrigeran dengan kapasitas kompresor 1 pk. Kabin dengan dimensi 50cm x 50cm x 50cm dikondisikan pada suhu 5 oC untuk mendinginkan tomat seberat 1 kg. Dari penelitian ini didapat bahwa Chilling Time dengan menggunakan HX kondensat sebesar 35 menit sedangkan tanpa HX kondensat sebesar 38 menit. Subcool rata-rata dengan menggunakan HX kondensat sebesar 3,320C sedangkan tanpa HX kondensat sebesar 0,030C. COPaktual rata-rata dengan HX kondensat sebesar 4,49 sedangkan tanpa HX kondensat sebesar 4,55. Nilai Efisiensi sistem rata-rata dengan HX kondensat sebesar 82,26 sedangkan tanpa HX kondensat sebesar 80,66. Konsumsi energy dengan HX kondensat sebesar 0,635 kWh sedangkan tanpa HX kondensat sebesar 0,701 kWh.

 

Kata kunci: radiant cooling, kondensat, liquid line sub-cooler
INTERPRETASI ANOMALI MEDAN MAGNET BUMI DI KAWASAN GUNUNGAPI LAMONGAN
Authors: Agustin Ninik
Published: May 2020

Lumajang merupakan salah satu kabupaten di Jawa Timur yang terdapat Kawasan Gunungapi Lamongan. Gunungapi Lamongan merupakan Gunungapi monogenesis muda yang tumbuh dari sesar pada puncaknya. Erupsi yang terjadi pada Gunungapi Lamongan tidak hanya pada gunung utama, tetapi juga membentuk kerucut parasit berjumlah sekitar 37 cinder cone dan 27 maar di sekitar gunung utama. Cinder cone dan Maar terbentuk ketika terjadinya kontak antara magma dan air sehingga menimbulkan erupsi freatomagmatik yang disertai dengan muntahan piroklastik dan aliran timbunan material. Penelitian ini berfokus pada pemetaan kawasan Gunungapi Lamongan bagian barat berdasarkan data anomali magnetik untuk mengetahui ada tidaknya aktivitas vulkanik di bawah permukaan Kawasan Gunungapi Lamongan. Berdasarkan analisis hasil penelitian, maka disimpulkan bahwa data anomali magnetik mengonfirmasi adanya suhu tinggi batuan bawah permukaan pada daerah selatan, barat, dan utara dari Gunungapi Lamongan di sekitar maar dan cinder cone yang diindikasikan dengan anomali magnetik negatif.

 

Kata kunci: Gunungapi Lamongan, maar, cinder cone, anomali magnetik.
ANALISA PERFORMANCE BAN PADA UNIT PRODUKSI OVERBURDEN HD-785 TERHADAP PRODUKTIVITAS TAMBANG BATUBARA
Authors: Puspitasari Laura
Published: May 2020

Kebutuhan produksi batubara yang semakin meningkat menyebabkan kinerja alat mekanis semakin besar. Dalam pekerjaan loading dan hauling material overburden, lifetime ban akan dipengaruhi oleh kondisi eksternal dan internal. Kondisi ekternal yang mempengaruhi  lifetime ban adalah kondisi jalan, beban muatan yang harus diterima unit, kecepatan unit dan maintenance ban. Sedangkan kondisi ekternal yang mempengaruhi lifetime ban adalah manufaktur ban dari pabrik yang merancangnya seperti standar Ton Kilometer Per Hour (TKPH) yang dipakai untuk aplikasi operasional dilapangan. Sehingga pemilihan ban yang tepat menjadi faktor penting agar operasional berjalan dengan lancar. Untuk meminimalisir resiko kerusakan ban perlu dilakukan pengelolaan ban yaitu mengevaluasi performa ban dengan melakukan analisis parameter-parameter Key Performance Indicator (KPI) dan perbandingan Ton Kilometer Per Hour(TKPH) rating dan aktual. Hasil penelitian menunjukkan bahwa kondisi jalan tambang yang tidak ter-maintenance dengan baik mempengaruhi lifetime ban.
Efek Merokok Terhadap Viskositas Darah
Authors: Sartika Sartika
Published: May 2020

Blood viscosity is strongly influenced by hematocrit and total protein levels. In general, active smokers have high hematocrit levels because cigarettes contain carbon monoxide which has a tendency to bind to hemoglobin faster than oxygen. So that oxygen levels in blood vessels can decrease. One of the body's physiological responses in meeting the needs of oxygen in the body is by increasing the production of red blood cells. Increased levels of red blood cells will affect total hematocrit levels. An increase in large molecular proteins such as fibrinogen also affects total blood viscosity.This research uses a quantitative approach to see the effect of smoking on blood viscosity. The population this study were all active smokers in Kendari. The sample this study were male active smokers who were selected using a purposive sampling technique in accordance with established inclusion and exclusion criteria. The sample this study as many as 40 people were divided into two groups, 20 active smokers and 20 non-smokers. Mann Whitney analysis results show that there is no significant difference in viscosity in smokers and non-smokers. However, Pearson analysis found that smoking has a significant correlation with blood viscosity.Keywords: Smoker, Blood Viscosity.ABSTRAKViskositas   darah   sangat   dipengaruhi   oleh  kadar hematokrit dan protein total. Pada umumnya perokok aktif memiliki kadar hematokrit yang tinggi karena rokok mengandung karbon monoksida yang memiliki kecenderungan berikatan dengan hemoglobin lebih cepat dibandingkan dengan oksigen. Sehingga kadar oksigen dalam pembuluh darah dapat menurun. Salah satu respon fisiologi tubuh dalam memenuhi kebutuhan oksigen dalam tubuh yaitu dengan cara meningkatkan produksi sel darah merah. Kadar sel darah merah  yang meningkat akan mempengaruhi kadar hematokrit total. Peningkatan protein bermolekul besar seperti fibrinogen juga mempengaruhi viskositas darah total.  Penelitian ini menggunakan pendekatan kuantitatif untuk melihat efek merokok terhadap viskositas darah. Populasi dalam penelitian ini adalah semua perokok aktif di Kendari. Sampel dalam penelitian ini adalah laki-laki perokok aktif yang dipilih dengan menggunakan teknik purposive sampling sesuai dengan kriteria inklusi dan eksklusi yang telah ditetapkan. Sampel dalam penelitian ini sebanyak 40 orang yang dibagi dalam dua kelompok yaitu kelompok laki-laki perokok aktif sebanyak 20 orang dan kelompok laki-laki bukan perokok sebanyak 20 orang. Hasil analisis Mann Whitney menunjukan bahwa tidak ada perbedaan viskositas yang signifikan pada perokok dan non-perokok. Namun Analisis Pearson diperoleh bahwa kebiasaan merokok mempunyai korelasi yang signifikan terhadap viskositas darah.Kata kunci: Perokok, Viskositas Darah.
STATE OF DIGITIZATION OF LIBRARY RESOURCES IN THE UNIVERSITY OF ILORIN LIBRARY, NIGERIA
Authors: Eromosele George , Adesina Olabis
Published: May 2020

The study investigated the state of digitization of library resources in the University of Ilorin Library, Nigeria. The questionnaire, relevant literature and personal observation constitute the major instruments for data collection. The SPSS was used for the analysis. Descriptive statistics such as frequency and percentages were also used to analyze each research question. The study found out that the University of Ilorin Library is making efforts in digitizing its local contents for easy access, preservation and to improve on digital contents availability for their online users on certain subjects and resources. However, provisions are not made for the digitization of certain materials which could be of immense benefits to their online users. Recommendations were made that more conscious effort should be made to digitize more of relevant library materials and the various useful intellectual properties of the institution so that user can gain access to a wider range of resources.
AN IMPROVED ARMORED VEHICLE KRAZ “FIONA” NOISE SILENCER
Authors: Fedorov Volodymyr , Yanovsky Vasyl’ , Kovalshuk Dmytro
Published: May 2020

Ecological requirements for cars grow from year to year, both in the world as a whole, and in Ukraine in particular. This is especially true of noise pollution. Additionally, noise reduction becomes relevant, taking into account the conduct of military operations during the last 5 years on the territory of Ukraine. The war has caused a special need for military vehicles for which masking properties are vital. Noise is a serious disincentive factor. Therefore, its reduction for a military vehicle, apart from the environmental aspect, is of a purely military nature, that is, it is extremely important. The car has many sources of noise there are many ways to deal with them. One of the most powerful source of noise is the sleeping bag. This kind of noise is reduced by means of silencers of noise. The vast majority of silencer data in the basis of its design has a reactive (or resonant) muffler. To calculate the jet silencer you must know the speed of sound in the sleeping bags. In order to increase the acoustic efficiency of reactive and resonant mufflers of exhaust gases noise of the ICE of cars, an experimental method was proposed for determining the speed of sound in the sleighs. Implementation of the method is carried out by measuring the attenuation of acoustic waves. The noise level of the bedrooms is measured without silencer and silencer. Based on the data obtained, the noise reduction performance of the residual is established. From the well-known formula, based on the calculation of the efficiency of the silencing of a jet muffler, a formula is obtained for calculating the speed of sound in the sleeping quays. In this formula, all parameters are known: the level of silencer efficiency, the noise level of the sleeping, the ratio of areas of cross sections of the muffler and the inlet pipe and the length of the muffler. The sound speed thus established can continue to be used not only for engines of the type for which measurements and calculations were made, but also with a certain approximation for some other types of engines. This method provides high accuracy for determining the required parameter. In the given work on the example of the armored car KrAZ “Fiona” the calculation of efficiency increase of the reactive silencer is made due to the above-mentioned method. Also, the projected decrease in the external noise level of the KrAZ Armored Vehicle “Fiona” is considered by determining the speed of sound in the recesses on the trunk cycle on the road with acceleration up to speed of 50 km/h (75 km/h) and the movement with this speed, as well as when driving at a speed of 45 km/h.
Keywords: transport, armored car, internal combustion engine, exhaust, exhaust gases, noise, source, acoustic efficiency, acoustic efficiency, speed of sound, jet muffler.
INFLUENCE OF CONCRETE COMPOSITION ON THE CORROSIVE STATE OF THE STEEL ARMATURES AND DURABILITY OF REINFORCED CONCRETE STRUCTURES
Authors: Koval Petro , Zelenovskiy Vladimir
Published: May 2020

The influence of the composition of the concrete mixture on the state of reinforcing steel as the main problem of corrosion of reinforced concrete structures is considered. The main attention is paid to the need for individual and mandatory consideration of the influence of the properties of additives to concrete on the passivation of reinforcing steel.
The purpose of conducting studies to determine the effect of concrete composition on the state of reinforcing steel is to analyze the causes of corrosion of reinforcement, determine the influence of the environment, apply appropriate prevention of this phenomenon and use methods to determine the corrosion state at the design stage of building structures for which reinforced concrete is used.
The composition of concrete, in addition to the standard set in various quantitative combinations (cement, gravel, sand, water) today it is advisable to use special additives.
Due to their correct and proportional application, you can create a mixture with significantly improved characteristics: with increased frost resistance, strength, durability, with accelerated or delayed setting of the mixture, etc. Nevertheless, you should not forget that the individuality of the composition of additives could affect the ability of concrete to passivate reinforcing steel.
It is possible to eliminate the possibility of reducing the passivation of concrete by testing reinforced concrete samples for its protective properties in relation to the reinforcement.
The test method is based on the passivation of reinforcing steel in an alkaline environment and consists in evaluating the protective effect of a sample of concrete in relation to a sample of steel reinforcement by comparing data obtained with a change in potential depending on changes in the density of electric current passing through the sample.
The issue of quality and durability of reinforced concrete structures, both technically and economically, is attracting increasing attention of builders. It is obvious that in most cases an increase in the initial cost of manufacturing the structure and its reliable protection is economically justified, if this allows reducing the number and cost of repairs during operation.
Keywords: reinforcement, corrosion, concrete, reinforced concrete, concrete additive, concrete composition, corrosion state of reinforcement, durability of reinforced concrete structures.