bluuebunny/crossref_metadata_2025 huggingface dataset:
Undergraduate Creative Multimedia Design Students’ Perceptions of Online Team-Based Learning
Authors: Tan Yeen-Ju Heidi
Published: May 2022

With higher learning institutions shifting to an online mode of instruction since the onset of the COVID-19 pandemic, educators have found it challenging to engage students through video conferencing tools whilst students struggle to concentrate and feel a sense of disconnect due to lack of social interaction in the online class. This is prevalent in design courses that are traditionally very hands-on and studio based. Team-Based Learning (TBL) offers a possible instructional approach to increase student engagement through a series of structured activities with emphasis on learning through small group interactions. However, there is a lack of research on the implementation of TBL in the creative multimedia design discipline and it is unclear how students in this discipline would perceive this method of learning. This paper presents a study that sought to introduce TBL to undergraduate creative multimedia design students and elicit their perceptions and attitudes towards this new approach to learning online. The design of the TBL class and student learning experience are discussed in detail. A survey questionnaire was used to gather feedback from students and a simple statistical analysis was conducted. Results suggest that at this introductory stage, students had an overall favourable perception of TBL however felt that the lengthy duration of TBL sessions affected their satisfaction of TBL and therefore remained on the fence about their preference for TBL classes.
here
Authors: Naru Akua
Published: May 2022

Poetic submission for special issue, "Hip hop and libraries," volume 6, issue 1/2, 2022.
Global Drumbeat
Authors: Kumasi Kafi , Brock André
Published: May 2022

This article outlines the scope and significance of a special issue of The International Journal of Information, Diversity & Inclusion dedicated to exploring the intersections of hip hop and the field of library and information sciences. The co-guest editors, Kafi Kumasi and André Brock, describe their respective research trajectories to help illuminate what constitutes a hip hop epistemology of LIS knowledge. This issue demonstrates that there are many robust conceptual access points for better understanding the LIS field through the lens of Hip Hop including areas like computational neuroscience, copyright and data science. The research articles are complimented by: two reports from the field; a creative section, which includes three poems; and a book review of two hip hop themed texts
Cover and Credits
Authors: Brochu Leah
Published: May 2022

Cover and credits for volume 6, issue 1/2, Winter/Spring, 2022.
Ethical AI and the Environment
Authors: Kelly Benjamin
Published: May 2022

Scientists have warned of the effects of global climate change for decades, and its impacts are increasingly experienced and understood worldwide. Despite calls to reduce the consumption of fossil fuels and resources in general, many believe in corporate and governmental ability to ‘innovate out’ of climate catastrophe. Artificial intelligence (AI) is a common theme among nearly all existing and upcoming technological climate solutions, however, AI’s environmental impacts are relatively unknown. This paper first highlights a few examples of how AI systems can help fight climate change and follows with an analysis of the various negative environmental implications driven by the need for greater computing power, and a general lack of AI governance policies. By analyzing existing literature and policy structures, this review finds that the most responsible methods to avoid cataclysmic climate impacts involve reducing our reliance on existing infrastructures, which propagate rising global temperatures, rather than relying on untested, saviour technologies.
Pro-Metabolic Brownies and Anti-Vaccine Rhetoric
Authors: Burt-D’Agnillo Madelin
Published: May 2022

This exploratory study investigates the links between conspiracy theories, wellness influencers, and COVID-19 misinformation. The study reviews literature that contextualizes conspiracy theories and New Age Spirituality: a framework coined as ‘conspirituality.’ The role of influencers is identified, particularly alternative health influencers, in spreading information about COVID-19. Specific case studies of conspiracy theorists and wellness influencers who have spread misinformation about COVID-19 are used as examples to demonstrate the themes of misinformation. Next, Instagram as a platform is evaluated—specifically, the algorithmic features which enable the spread of COVID-19 misinformation—presenting some solutions and further considerations for policy decisions. Ultimately, this research shows that COVID-19 illuminated a series of existing elements which converged to create an atmosphere whereby young women are exposed to misinformation about COVID-19 by engaging with wellness influencer content on Instagram. This trend can be explained by web-based conspirituality discourse, the gendered social media landscape, and inadequate policies for managing misinformation online.
Here and Queer in Toronto
Authors: Margolis Avigayil
Published: May 2022

This paper imagines a museum of Toronto’s queer history, focused on local artists, social movements, and political activism. This museum seeks to reimagine how queer individuals are treated within the museum world by imagining an exhibit space where queer ways of being are normalized and respected. In reviewing a history of queer exhibits and queer studies, I conceptualize a queer use of space, where disorientation and strangeness serve to normalize everyday queer joy. I highlight where past galleries have succeeded and failed in exhibiting queer lives, and the complications of identifying with historical figures who predate contemporary labels such as “gay” or “transgender.”
Analysing the Psychological Impact of the COVID-19 Pandemic among Turkish Immigrants
Authors: Cindik-Herbrüggen Elif , Demirkol Rahman
Published: May 2022

COVID-19 Pandemic has already triggered a variety of psychological problems including fear, depression, anxiety, and suicidal attempts. This study aimed to investigate Turkish immigrants' psychological conditions and top concerns in Germany during the COVID-19 Pandemic. Demographics and current psychological conditions of participants were collected and analysed by means of a structured survey. A questionnaire was completed by 170 Turkish immigrants in Munich, Germany. The results demonstrated that Turkish immigrants with low income and education level as well as an unemployment status were worried more during the Pandemic. Moreover, the risk of elderly people getting infected by COVID-19 was one of the top concerns of participants. Therefore, main concerns of participants in our study were the deterioration of their economic situation and the possibility of older adults getting infected by COVID-19.
Dual Nature of International Circular Migration
Authors: Illés Sándor , Gellér-Lukács Éva
Published: May 2022

The paper deals with the international circular migration which has globally become a buzzword in scientific, political, and administrative circles since the new century. The article concentrates on an unknown feature of the circular migration, namely its dialectic nature, which encompasses both event and system characteristics. This would be the common root of false ideas surrounding human circulation. The literature echoes wide variety of conceptualisations of international circular migration. However, the investigation and application of double characteristic is absent. On one hand, circular migration is a type of migration as a simple event, on the other hand that is a repeat process or a complete system. The main aim of the article is to discuss the event-system dilemma in general and to provide a sort of practical solution with empirical evidence that comes from Hungary in particular. Moreover, the authors contribute to the clarification of the general concept of human circular mobilities.
Latin Americans in Switzerland : Dual Citizenship, Gender and Labour Market Incorporation
Authors: Galeano Juan
Published: May 2022

Since the 1990s, many European and Latin American countries have changed their laws to permit the acquisition of dual citizenship. This shift has accompanied the increase in Latin American migration to Europe and poses new challenges for studies on migrants’ integration, which are often based on nationality. We investigate the labour market incorporation of the Latin American-born population in Switzerland and compare the position of different groups of Latin American-born populations according to their nationality (Latin American, EU27 or Swiss). To do so, we assess the rate of overqualification for each group, separate by sex, and we implement logistic models to evaluate the impact of sociodemographic covariates on the likelihood of being overqualified. The results reflect the Swiss labour market segmentation by both nationality and sex, as the influence of the reason for migration on the labour market incorporation of these groups.
Employment Status and Labour Income of Turkish and Other Immigrants in the United States
Authors: Dudu Selda
Published: May 2022

Turkish immigrants are a growing part of the US labour market. This article explores the employment status and labour income determinants of the Turkish immigrants in the US between 2000 and 2019, using data from the American Community Survey and comparing them with other immigrants. The estimation findings show that gender, age, marital status, English level, citizenship status, education level, occupation, and years spent in the US are significant determinants of the employment status and labour income of immigrants in the US. Although Turkish immigrants earn more on average than other immigrants, once other factors (such as gender, age, education level, years spent in the US, citizenship status, proficiency in English, and occupation) are taken into account, the regression analysis demonstrates that some Turkish immigrants earn exceptionally high salaries in the US; in contrast, the remainder earn average or below-average amounts.
Expression of Emotions in The Norwegian-American Immigrant Letters, 1838-1848
Authors: Masud Md. Matiul Hoque , Østrem Nils Olav
Published: May 2022

Emotions are integral to human mobility. However, research on the expression of emotions in the letters of early immigrants is often neglected. This study on emotional expressions in early Norwegian-American immigrant letters, exchanged between 1838 and 1848, is a case in point. This article explores the dynamics in emotional expressions in the early letters of Norwegian-American immigrants. It shows how immigrants expressed their emotions in the letters addressed to their family members, neighbours and friends. This article also investigates the presence of emotional calls in the immigrant letters, which successfully pulled more people from Norway to America. Unlike many other early immigrant groups, Norwegian immigrants in America were satisfied with their migration experience and expressed more positive emotions in their home-going letters than negative ones. Considering the lack of research on the emotional aspects of migration, this paper recommends conducting more studies on this area.
Youth and Migration Aspiration in Kerala
Authors: KM Sulaiman , R B Bhagat
Published: May 2022

The emergence of oil production in Gulf countries and the subsequent oil boom in the 1970s led to massive migration from Kerala to Middle East Gulf countries as part of the post-industrial migratory order. The Gulf countries and their opportunities became an integral part of Kerala's youth life while developing future goals and aspirations. This paper provides insight into the migration aspiration of the youth from Kerala and their awareness of migration. A questionnaire survey was conducted in the second half of 2019 in Calicut, Kerala. The sample consisted of 491 students. Most youths are aware of gulf migration through their family, friends and media. Two out of three youths aspire to migrate abroad in future for a job and related activities. Surprisingly, in Kerala, youth with migrant fathers don't aspire to migrate than youth with non-migrant fathers. While having a migrant friend shows a higher likelihood of aspiration to migrate among youth. In the case of Kerala, in the coming 10 to 20 years, migration will continue as a potential life choice for achieving life goals for youth in Kerala. Policies should promote awareness about migration and facilitate a secure and safe migration for youths.
Nganasanin itsekorjaus
Authors: Kaheinen Kaisla
Published: May 2022

Artikkeli käsittelee nganasanin itsekorjausta vuorovaikutuslingvistisestä näkökulmasta. Itsekorjaus on suullisen vuorovaikutuksen ilmiö, jolle tyypillistä on lausuman keskeyttäminen sen hetkisen puhujan omassa puheessa esiintyvän ongelman korjaamisen ajaksi. Itsekorjauksen suorittamiseen käytetyt keinot ovat osittain riippuvaisia käytetyn kielen morfosyntaktisesta rakenteesta ja vaihtelevat kielittäin. Artikkelini tavoitteena on kuvata korjaustoimintoja eli korjausten suorittamiseen käytettyjä morfosyntaktisia keinoja sekä korjauksen yleisimpiä pragmaattisia merkityksiä puhuttua kieltä edustavan aineiston perusteella. Nganasanin yleisimmät korjaustoiminnot muistuttavat Schegloffin (2013) aiemmin kuvaamia, mutta ne rakentuvat nganasanin morfosyntaksille tyypillisellä tavalla. Korjaustoimintojen avulla puhujat käsittelevät monenlaisia ongelmia äänteellisistä lipsahduksista kompleksisiin, keskustelun dynamiikkaa koskeviin sosiaalisiin ongelmiin. Aineistossa esiintyy paljon myös koodinvaihtoon ja virheellisinä pidettyihin sanamuotoihin kohdistuvia korjauksia, joiden perusteella on mahdollista tarkastella puhujien kieliasenteita.
On Finnic and Khanty vowel harmony: domains, slopes and their role in typology
Authors: Fejes László
Published: May 2022

The main purpose of this paper is to draw attention to the inaccuracies in the article by Paul Kiparsky and Karl Pajusalu (2003). Their influential study suggests a typological classification of vowel harmony based on mostly Finnic languages and their dialects which is claimed to be supported by a particular OT analysis. However, in many cases, their example languages and dialects are hardly classifiable into the category suggested by them. Moreover, their OT analysis completely ignores cases of variation (including vacillation) in the example languages. The present study deals with the data available for Estonian (Mulgi and Northeastern dialects), Veps and Khanty, and demonstrates – mostly based on the same sources referred to by Kiparsky and Pajusalu – that the actual patterns of harmony are considerably different from the patterns described in their article. It is  emphasized that many patterns do not arise from the behavior of neutral vowels but instead, they can be results of the length and the nature of the harmonic domain. The paper also introduces the notion of harmonicity slope, according to which the domain has no strict borders and in which the tendency for the vowels to harmonize gradually diminishes.
Inarinsaamen ja koltansaamen nuotta-apajien nimet:
Authors: Valtonen Taarna
Published: May 2022

Tässä artikkelissa analysoin inarin- ja koltansaamen nuotta-apajien nimien rakennetta, muodostamistapaa ja nimeämisperusteita. Lisäksi tarkastelen nuottaamiseen liittyvää sanastoa ja sen historiaa. Materiaalina on 204 inarinsaamenkielistä apajannimeä Inarista sekä 161 koltansaamenkielistä apajannimeä Suonikylästä, Petsamosta. Nimiä analysoidaan Kurt Zilliacusin ja Eero Kiviniemen 1960 ja -70-luvuilla kehittämän syntaktis-semanttisen luokittelumallista sovelletulla metodilla. Alkuperäisen metodin sopivuutta saamen kielten paikannimien luokitteluun lähestytään kriittisesti. Tulokset osoittavat, että inarin- ja koltansaamen nimiopit eroavat toisistaan, mutta niissä on myös paljon yhteistä. Koltansaamen apajannimistä on tunnistettavissa selvästi prototyyppinen, kaksisosainen rakennetyyppi, jonka perusosa on tai se päättyy sanaa laapp ’apaja’. Koltansaamen apajannimet ovat keskimäärin yhden sanan pidempiä kuin inarinsaamessa. Edellä mainittu rakennetyyppi löytyy myös inarinsaamesta, mutta se on vain yhtä tavallinen kuin useat muut tyypit. Inarinsaamen apajannimien rakennetyypit muistuttavat talonnimien rakennetyyppejä. Nimeämisperusteet ovat pääosin samanlaisia kummassakin kielessä. Tavallisin nimeämisperuste on molemmissa kielissä apajan sijainnin tai aseman kuvaaminen.
Krankheit auf Wanderschaft
Authors: Bartens Hans-Hermann
Published: May 2022

Among the speakers in the area from Inari to Southern Sámi, legends about epidemic, contagious diseases are part of the oral tradition. The core is constituted by legends about the plague and therefore are at the centre of the present article drawing upon both published and unpublished sources. Legends about other contagious diseases show parallels with them. The plague can take different shapes. For example, it may assume an anthropomorphic shape in the entire tradition area which becomes invisible in certain situations. Zoomorphic shapes turn out to be rather peripheral. The plague is, just as other contagious diseases, not induced by magic in the Sámi tradition. It is incurable, but it is possible to protect oneself from it in different ways, seek to annihilate it, or to make it submissive. Out of self-interest, the plague spares certain individuals.
 There are, also for taboo reasons, multiple denominations for the plague restricted to certain regions. As far as the contents are concerned, there are also clear regional differences. This can be seen, for example, in the way of getting around, which in the North is above all unindependent, or in the ethnic aspects which surface in the more multifacetic Southern traditions.
Mihin suuntaan saamen progressiivirakenteet ovat menossa?
Authors: Kuokkala Juha
Published: May 2022

The Saami languages utilize a long-established progressive construction based on the inflected copula verb and the so-called action essive form of the main verb, for example North Saami lea dahkamin ‘is doing’ of dahkat ‘to do’. The present paper examines an apparently innovative construction that has not been described before, similarly appearing in a progressive function but based on the inflected copula and the locative case form of the deverbal noun in -u, for example lea jođus ‘is going’ of johtit ‘to travel, go, be in motion’. The main data source used is the SIKOR corpus, containing contemporary written language material in several Saami languages; supplementary sources of both written and oral material and of different ages are used as well. The data reveals that the new construction is frequently used of the verb johtit ‘to travel, go’ in modern North Saami (leat jođus) and fairly known in Inari Saami, too (leđe joođoost). It is used more rarely of the verb mannat ‘to go’ in North Saami (leat manus); from Inari Saami there is only a single attestation of this verb in older data. Other verbs are not observed to be used in a similar construction, and the innovation seems to be confined to the contemporary use of these two Saami languages. It is argued that there are both language-internal and external factors that have contributed to the emergence of the leat jođus construction, including the global tendency of progressives to develop out of locative constructions and most importantly the model of the contact language Finnish, where a structurally identical deverbal noun based progressive construction is commonly used of the most frequent motion verbs (olla menossa ~ tulossa ~ lähdössä of mennä ‘to go’, tulla ‘to come’, lähteä ‘to depart’).
Akıllı Telefon Bağımlılığı ile Yaşam Doyumu İlişkisinde Nomofobinin Rolü: Yapısal Eşitlik Modeli Uygulaması
Authors: YAKUT Emre , SARI Havva , KURU Özlem
Published: May 2022

Akıllı telefonlara sürekli eklenen özellikler nedeniyle bireylerin günlük işlerinin büyük bir kısmını telefonları üzerinden bitirebilmeleri, bireylere daha fazla akıllı telefon kullanımı için motivasyon sağlamıştır. Ancak bu durum bireylerin problemli akıllı telefon kullanımını artırmış, akıllı telefon bağımlılığı olarak nitelendirilen ve davranışsal bağımlılıklar arasında yer alan bir soruna dönüşmüştür. Benzer şekilde günlük hayatının belirli bir bölümünü akıllı telefonlarına ayıran bireyler, bağımlı oldukları akıllı telefonlarından ayrı kalma korkusu olarak nitelendirilen nomofobi problemi ile karşılaşmıştır. Her iki durum ise sonuç olarak bireylerin akıl sağlığını ve toplumsal ilişkilerinin niteliğini açıklayan yaşam doyumunu etkilemiştir. Çalışmada öğrencilerin akıllı telefon bağımlılıkları, nomofobi düzeyleri ve yaşam doyumları arasındaki ilişkilerin incelenmesi amaçlanmıştır. Çalışmada Osmaniye Korkut Ata Üniversitesi öğrencilerinden 430 birimlik bir örneklem ile çalışılmıştır. Değişkenler ile ilgili literatür incelemesinden yola çıkılarak oluşturulan yapısal eşitlik modelinin analizi sonucunda akıllı telefon bağımlılığı ile nomofobi arasında pozitif, nomofobi ile yaşam doyumu arasında negatif ve akıllı telefon bağımlılığı ile yaşam doyumu arasında negatif yönlü anlamlı ilişkiler saptanmıştır. Ayrıca akıllı telefon bağımlılığı ile yaşam doyumu arasındaki ilişkide nomofobinin kısmi aracılık rolü olduğu tespit edilmiştir.
Comparative Analysis of Subjective Satisfaction Between Hearing Aid Users With Insurance Payment and General Payment
Authors: Nam Gi-Sung , Cho Sung Il
Published: May 2022

Background and Objectives This study aimed to compare subjective satisfaction and functional hearing gain between users of hearing aids with insurance payment (HA with IP) and hearing aids with general payment (HA with GP).Subjects and Method The functional hearing gain and subjective satisfaction of 42 HA with IP and 38 HA with GP were compared after the final fitting, retrospectively. Sound field pure tone and speech audiometry were performed after 4 sessions of hearing aids fitting. Subjective satisfaction was evaluated using the Korean version of abbreviated profile of hearing aid benefit (APHAB) and the international outcome inventory for hearing aids (IOI-HA).Results Sound field pure tone thresholds and speech discrimination scores were improved after the final fitting of hearing aids in both HA with IP and HA with GP groups. HA with IP group showed significantly better results in aversiveness of APHAB and the IOI-HA scores than HA with GP group did.Conclusion These results suggest that hearing aids with insurance payment provide considerable benefits and satisfaction, and can be a good alternative for hearing rehabilitation in hearing-impaired patients.
Pediatric Fetal Rhabdomyoma Representing as Acute Mastoiditis: A Case Report and Literature Review
Authors: Kim Byeong Jin , Yang Yun Na , Lee Chan Mi , Lee Eun Jung
Published: May 2022

Rhabdomyomas are rare benign tumors. Most extracardiac rhabdomyomas are found in the head and neck region, especially in the pharynx and larynx. Herein, we have described the case of a 1-year-old boy presenting with recurrent otorrhea and postauricular swelling. His symptoms were due to a mass that was histologically diagnosed as fetal rhabdomyoma (FR). Here, we report the first case of FR in the postauricular area. Clinicians should keep in mind the possibility of FR if a child presents with external auditory canal mass associated with recurrent otorrhea and signs of mastoiditis.
Difference in Thresholds Between Auditory Brainstem Response Test and Pure Tone Audiometry by Frequency
Authors: Lim Taehun , Oh Joo Hyung , Joo Joon Bum , Cho Ju Eun , Park Pona , Kim Jong Yang
Published: May 2022

Background and Objectives There is no clear standard for the difference in the thresholds of auditory brainstem response (ABR) and pure tone audiometry (PTA) when using ABR to evaluate the reliability of PTA. Therefore, we assessed the difference in the thresholds of ABR and PTA for each frequency. Consequently, we present here the actual difference values between the two tests that can be used as a reference in the clinic.Subjects and Method We retrospectively assessed the audiometry results of 129 ears. Ears in which the hearing thresholds of each frequency continuously declined were classified as the downward group. We compared the average of differences between the two tests by frequency. The differences were compared for each hearing level from 50 dB or higher.Results For all ears, the appropriate range of difference value was ±5 dB at 2 kHz. At 1 kHz, the ABR threshold was 10 dB higher than PTA, and it was 10 dB less than PTA at 4 kHz. In the downward group, the difference value increased by 10 dB at 1 kHz and 4 kHz. In the subgroups at each hearing level, the difference value showed similar results (p<0.05).Conclusion The difference in the threshold, regardless of the severity or tendency of hearing loss, was the smallest at 2 kHz and the range was ±5 dB. ABR was 10 dB higher at 1 kHz and and 10 dB lower at 4 kHz than PTA. In the downward group, the difference at 1 kHz and 4 kHz increased by 10 dB each.
A Case of Migrated Esophageal Foreign Body Removal Through Cervical Approach Under C-Arm Fluoroscopic Guidance
Authors: Choi Seong-Wook , Lee Minhyung , Lee Jin-Choon , Sung Eui-Suk
Published: May 2022

Foreign bodies in the upper airway and the esophagus are common and often removed in the outpatient setting using the rigid or flexible laryngoscope. Although most esophageal foreign bodies are removed from the digestive tract, in some cases, surgical intervention is required due to its difficult location. Esophageal foreign bodies often removed by esophagogastroduodenoscopy, but when they penetrate the esophagus and move to deep neck spaces, other approaches should be taken into consideration. We report a rare case of a 13-year-old patient whose esophageal foreign body moved to a deep neck compartment, which was embedded in the anterior vertebral muscle. We decided to perform neck exploration under C-arm guidance, successfully targeted and removed the foreign body.
PENGGUNAAN FILTER AKTIF DENGAN PI CONTROLLER UNTUK MEREDAM HARMONISA PADA PEMBANGKIT LISTRIK TENAGA SOLAR CELL
Authors: Diki Diki dwi aprisetiawan , Winarno Istiyo , Dewantara Belly Yan
Published: May 2022

Pada sistem tenaga listrik yang ideal, energi listrik ditransmisikan secara konstan baik frekuensi maupun arus. Karena peningkatan beban daya lebih kompleks, terutama beban non-linier, akan mengubah bentuk gelombang dan spektrum arus menjadi terdistorsi. Gelombang dan spektrum yang terdistorsi pada arus disebabkan interaksi antara sistem gelombang sinusoidal dengan komponen gelombang lain yang dikenal sebagai harmonik. Penelitian ini membahas tentang perubahan gelombang dan spektrum pada system PLTS dengan cara menggunakan filter aktif menggunakan control PI dengan menggunakan beban beban controlled rectifier dengan sudut penyalaan 35° -180° sehingga akan terlihat bentuk cacat gelombang spektrum pada beban non-linear berdampak terhadap gangguan peralatan seperti terjadinya pemanasan berlebih meningkatkan rugi rugi dan membuat perangkat elektronikm cepat. Filter aktif menggunkan control PI didasarkan pada inverter satu fasa dengan empat switch control, inverter akan terhubung paralel dengan beban nonlinier. Dari uji coba menggunakan perangkat lunak simulasi Power Simulation (PSim), menampilkan hasil simulasi dengan spektrum dari gelombang yang merupakan penerapan dari rancangan filter aktif. Hasil simulasi menunjukkan adanya perbaikan gelombang, grafik spektrum dan THD dengan pemasangan filter aktif menggunakan control PI.

Kata kunci: Harmonisa, PLTS, THD, Filter aktif, Kontrol PI
ANALISIS VARIABEL PENYEBAB TIDAK TERCAPAINYA RECOVERY BIJIH TIMAH PADA JIG DALAM PROSES PENCUCIAN DI KAPAL KERUK
Authors: Rande Aprilia
Published: May 2022

Instalasi pencucian pada Kapal Keruk berperan penting dalam proses produksi mengingat endapan yang terdapat pada penambangan lepas pantai adalah endapan alluvial berupa pasiran. Tujuan penelitian ini dilakukan untuk mengetahui proses recovery bijih timah pada jig dalam proses pencucian di Kapal Keruk dan menganalisis variabel yang menyebabkan tidak tercapainya recovery bijih timah pada jig dalam proses pencucian di Kapal Keruk. Pengaturan variabel-variabel jig memberikan pengaruh besar terhadap material undersize. Banyaknya material undersize akan berpengaruh terhadap recovery bijih timah yang dihasilkan dalam proses pencucian dengan target recovery 95,50 %, sehingga perlu dilakukan optimalisasi jig dengan melakukan perubahan pada variabel jig untuk meningkatkan recovery bijih timah pada Kapal Keruk. Variabel jig pada Kapal Keruk 19 Bangka 2 dilakukan perubahan pada panjang pukulan menjadi lebih besar dari sebelumnya (1 – 2 mm), dengan tujuan menyesuaikan ukuran fraksi diameter timah yang akan dilakukan pencucian (#50 – #70), sehingga meningkatnya recovery sesuai dengan SOP perusahaan. Pengaruh hasil recovery setelah dilakukannya perubahan ukuran variabel panjang pukulan menjadi 96,98 % dari 95,60 %. Tujuan utama perubahan variabel panjang pukulan adalah mengoptimalkan hasil pencucian menjadi lebih baik dan meningkat dari 0,10 % menjadi 1,48 % di atas target SOP.

Kata kunci: Jig, recovery, pencucian, Kapal Keruk.
KARAKTERISTIK MINERALISASI BIJIH EMAS PADA PROSPEK HARGOSARI, KECAMATAN TIRTOMOYO, KABUPATEN WONOGIRI, PROVINSI JAWA TENGAH
Authors: Idrus Arifudin , Hermansyah Wahyu
Published: May 2022

Tirtomoyo di Kabupaten Wonogiri dikenal sebagai daerah mineralisasi bijih, di mana salah satu prospeknya adalah Hargosari. Belum ada penelitian sebelumnya yang mengungkap bagaimana karakteristik bijih pada prospek ini. ini mineralisasi bijih emas meliputi aspek mineralogi, tekstur, geokimia dan kondisi pembentukannya. Metoda penelitian mencakup pemetaan dan pengambilan sampel, serta sampel terpilih dianalisis petrografi, mikroskopi bijih dan kimia bijih. Batuan induk berupa lava andesit yang termasuk pada Formasi Panggang berumur Oligo-Miosen. Sistem bukaan urat diketahui sebagai tipe jogs membentuk en-´echelon tension gash veins. Tipe alterasi terdiri atas argilik dan propilitik, dengan mineral logam berupa pirit, kalkopirit, sfalerit, galena, emas, perak, krisokola, kovelit dan hematit. Urat kuarsa dengan tebal rerata sekitar 5 cm menunjukkan struktur massive, swarm, low angle veins dan stockwork, serta memiliki tekstur normal banded, crustiform, comb dan sakaroidal. Urat tersebut mengandung logam dasar yang tinggi mencapai 5,45% Cu, 9,9% Pb dan 12,85% Zn, dan logam berharga mencapai 3,85 g/t Au dan 395 g/t Ag. Endapan tersebut diperkirakan terbentuk pada temperatur 250-300°C mengacu pada himpunan mineralnya. Berdasarkan karakteristik tersebut, mineralisasi emas pada prospek Hargosari merupakan epitermal sulfidasi menengah.

Katakunci: karakteristik, emas, epitermal, Hargosari, Wonogiri.
FITOREMEDIASI TANAH TERCEMAR Pb DAN Zn DI TEMPAT PEMBUANGAN AKHIR (TPA) SAMPAH PIYUNGAN, YOGYAKARTA
Authors: Siti Fatimah Kartika Eka Putri Srisena , Budianta Wawan
Published: May 2022

Tempat Pembuangan Akhir Sampah (TPA) sampah Piyungan di Yogyakarta merupakan salah satu tempat pembuangan sampah di Yogyakarta yang telah mengakibatkan terjadinya pencemaran tanah oleh timbal (Pb) dan Seng (Zn). Penelitian ini bertujuan untuk menganalisis pengaruh karakteristik tanah tercemar yang diambill dari lokasi TPA Piyungan terhadap efektifitas serapan Pb serta Zn oleh tanaman jarak pagar (Jatropha Curcas) dan bayam (Amaranthus Spinosus L.) Percobaan fitoremediasi dilakukan pada polybag yang diisi dengan 2 kg sampel tanah tercemar Pb dan Zn, kemudian percobaan dilakukan di dalam rumah kaca selama 3 bulan, dengan pemanenan yang dilakukan setiap bulan. Pada setiap panen, sampel tanaman dibagi menjadi bagian pucuk (kombinasi antara batang dan daun) serta akar, kemudian dianalisis konsentrasi Pb dan Zn setelah dilarutkan dalam aqua regia. Analisis konsentrasi Pb dan Zn dilakukan dengan menggunakan ICP-AES. Hasil percobaan fitoremediasi menunjukkan bahwa baik kandungan Pb maupun Zn terdeteksi seiring dengan kedalaman sampel tanah yang diambil. Hal tersebut menunjukkan bahwa kandungan Pb dan Zn paling tinggi berada pada lapisan tanah bagian atas. Karakteristik tanah di TPA Piyungan, meliputi: pH, kandungan organic, dan kandungan mineral lempung yang mempengaruhi efektifitas serapan dalam proses fitoremediasi, terutama pada kandungan montmorilonit dalam tanah. Hal ini dikonfirmasi dari hasil perhitungan efisiensi serapan dan perhitungan mass balance serta removal efficiency yang dilakukan yang menunjukkan bahwa tanaman jarak pagar (Jatropha Curcas) dan bayam (Amaranthus Spinosus L.) memiliki nilai yang relatif rendah.

Kata kunci: Fitoremediasi, tanah, pencemaran, timbal, seng.
GUNUNG API PURBA CANDISARI : IDENTIFIKASI AWAL, KARAKTERISASI PEMBENTUKAN, POSISI STRATIGRAFI DAN POTENSI PEMANFAATANNYA
Authors: Oky Sugarbo
Published: May 2022

Abstrak

Pada Zona Pegunungan Selatan, banyak tersingkap batuan gunung api produk dari busur Gunung Api Tersier. Pada zona tersebut, telah banyak dilakukan penelitian namun penelitian baik tentang keberadaan gunung api purba maupun pusat erupsi purba masih belum dilakukan secara menyeluruh, sehingga perlu dilakukan penelitian lebih lanjut terkait vulkanisme purba Pegunungan Selatan. Maksud penelitian ini adalah melakukan identifikasi awal keberadaan gunung api purba berdasarkan data lapangan dan laboratorium, dengan tujuan untuk mengetahui karakter, genesis, posisi stratigrafi, dan potensi dari gunung api purba yang menghasilkan banyak batuan gunung api. Metode penelitian yang dilakukan berupa metode pemetaan permukaan yang didukung dengan data laboratorium berupa petrografi dan geokimia batuan menggunakan X-Ray Flourecence. Pada daerah penelitian, ditemukan adanya indikasi gunung api purba berdasarkan data citra, litologi, stratigrafi, petrograf,  dan geokimia, dengan asosiasi fasiesnya berada pada fasies proksimal bagian atas. Secara stratigrafi, batuan Gunung Api Purba Candisari berada di bawah Formasi Semilir namun bukan bagian dari Formasi Kebo-Butak. Keberadaan batuan gunung api yang melimpah dapat dimanfaatkan sebagai bahan galian C. Selain itu, perlu dilakukan studi lanjut tentang adanya alterasi hidrotermal pada daerah penelitian yang kemungkinan dapat dimanfatkan warga sekitar karena batuan yang teralterasi dapat memiliki nilai ekonomi.

Kata kunci: lava, genesis, vulkanisme, purba, Candisari.
PREFERENSI MASYARAKAT DALAM PEMILIHAN MODA TRANSPORTASI PUBLIK DI KOTA YOGYAKARTA
Authors: Nurkukuh Dwi Kunto , Kurniawati Amithya Irma
Published: May 2022

Minat masyarakat terhadap transportasi publik di Kota Yogyakarta menurun. Kondisi ini diperparah adanya persaingan antara transportasi publik konvensional dan transportasi publik online. Tujuan penelitian ini untuk mengetahui preferensi masyarakat dalam pemilihan moda transportasi publik di Kota Yogyakarta. Penelitian dilakukan menggunakan Analytical Hierarchy Process (AHP). Masyarakat Kota Yogyakarta memperhatikan kriteria pemilihan moda dengan urutan: 1) Keamanan, 2) Kenyamanan, 3) Kemudahan, 4) Waktu, 5) Biaya. Moda Transportasi Publik yang dipilih masyarakat Kota Yogyakarta dengan mempertimbangkan kelima kriteria tersebut yaitu peringkat: 1)Ojek Mobil Online, 2)Ojek Motor Online, 3)Bus Trans, 4)Taksi Konvensional, 5)Ojek Motor Offline, 6)Becak. Dari kriteria biaya, Bus Trans paling hemat. Dari kriteria waktu, Ojek Motor Online paling cepat. Dari kriteria kemudahan, Ojek Motor Online paling mudah. Dari kriteria keamanan, Ojek Mobil Online paling aman. Dari kriteria kenyamanan, Ojek Mobil Online paling nyaman
PENERAPAN KECERDASAN BUATAN PADA PENILAIAN KELAYAKAN EKONOMI TAMBANG BATUBARA
Authors: Sidiq Hidayatullah , Heriyadi Nur Widi Astanto Agus Tri
Published: May 2022

Metode penilaian kelayakan ekonomi sangat penting dalam menentukan nilai suatu proyek. Adanya ketidakpastian yang tinggi dalam industri pertambangan baik dari segi teknis maupun non teknis, menyebapkan risiko proyek pertambangan relatif lebih tinggi dibandingkan dengan industri lain. ketidakpastian dimodelkan dengan suatu deret probabilitas yang tidak terputus. Distribusi ini banyak digunakan untuk memodelkan ketidakpastian dari faktor non teknis seperti harga komuditas. Untuk menggambarkan ketidakpastian dari input variabel dalam simulasinya depat menggunakan teknik simulasi monte carlo. Selain itu untuk memprediksi harga jual batubara menggunakan algoritma kelelawar. Hasil penelitian menunjukan bahwa prediksi harga batubara adalah salah satu parameter yang sulit diprediksi. Untuk menentukan harga jual dapat menggunakan pendekatan prediksi dengan bantuan kecerdasan buatan. Prediksi harga menggunakan simulasi monte carlo menghasilkan harga jual batubara dengan kalori 5700 kcal/Kg adalah $ 42,2 per ton. Sedangkan jika menggunakan algoritma kelelawar adalah $42,18 per ton. Analisis kelayakan proyek tambang menggunakan metode DCF dengan NPV yang paling maksimal berada pada stripping ratio 2,5 dengan volume batubara sebesar 11 juta ton.
STUDI ANALISIS DAYA DUKUNG TANAH TERHADAP FONDASI DALAM BERDASARKAN DATA SPT PADA BANGUNAN PELIMPAH DARI BENDUNGAN TUGU
Authors: Hamidi Muhammad Iqbal , Sadisun Imam Achmad
Published: May 2022

Pembangunan infrastruktur yang masif di Indonesia saat ini dibutuhkan perencanaan dan pelaksanaan yang baik. Lokasi penelitian termasuk ke dalam proyek pembangunan bangunan pelimpah dari Bendungan Tugu. Penelitian daya dukung dibatasi dengan menghitung untuk fondasi dalam jenis boredpile berdiameter 0.8 meter dengan menggunakan data SPT (Standart Penetration Test). Pengujian SPT dilakukan berdasarkan SNI 4153:2008. Perhitungan daya dukung tahanan ujung ultimate (Qp) pada breksi vulkanik dan andesit memiliki nilai 19.60 Ton. Sedangkan untuk nilai tahanan gesek ultimate (Qs) pada breksi vulkanik dan andesit ini memiliki nilai 0.84 Ton, nilai tahanan gesek ultimate ini bertambah nilainya sesuai kedalaman fondasi yang direncanakan dan disesuaikan dengan beban bangunan. Untuk lapisan tanah lanau pasiran terubah memiliki tahanan ujung ultimate (Qp) dan tahanan selimut gesek (Qs) bervariasi sesuai dengan nilai rata-rata N-SPT. Adanya perbedaan nilai N-SPT pada lapisan tanah yang sama disebabkan adanya proses geologi seperti alterasi hidrotermal dan pelapukan batuan sebelumnya.
KARAKTERISTIK GEOLOGI TEKNIK DESA KATEKAN, KECAMATAN GANTIWARNO, KABUPATEN KLATEN, PROVINSI JAWA TENGAH
Authors: Kristanto Wisnu Aji Dwi , Agustiyar Fandika , Damayanti Ayu , Sari Vanya Cesaria Evelina
Published: May 2022

Supporting data for sustainable development is increasingly being considered to fulfill good primary development data. One of the data that is often ignored is the engineering geology of the land. These data are needed to describe the response of the land to various aspects imposed on the land from a geological and engineering point of view. Thus, it is necessary to investigate the characteristics of engineering geology before the land is used or as part of the evaluation. Katekan village, with its rapid population growth, requires the construction of various life support facilities. This is evidenced by the construction of many new houses in various village areas and access roads with cast and asphalt materials. The development that occurs, not a few uses agricultural land which has clay-rich soil material. Many problems occur in the construction, including house cracks, cracks in the road, and puddles. It becomes interesting to investigate related to geological engineering conditions. Investigation of the technical geological characteristics of Katekan Village, which was carried out by qualitative and quantitative field mapping, resulted in the distribution of rock units in the form of alluvial deposits of clay, sand, and silt. Slope variation between 3°-8°. The level of ease of excavation of rock mass ranges from easy to excavate to challenging to excavate. Rock bearing capacity is 72.42-154.63 t/m2, and the soil bearing capacity is 13.63-41.51 t/m2.
KAJI EKSPERIMENTAL PENINGKATAN SUB-COOLING KONDESER PADA KULKAS SATU PINTU MENGGUNAKAN AIR KONDENSAT
Authors: Bagja M. Fathan Sugih , Mitrakusuma Windy Hermawan , Pramudantoro Triaji Pangripto
Published: May 2022

Air kondensat yang tertampung pada wadah penyimpanan di bawah kabin freezer seringkali menjadi masalah pada kulkas-kulkas rumah tangga karena menyebabkan pembentukan es dan genangan air. Pada tugas akhir ini, dilakukan eksperimental peningkatan sub-cooling pada kulkas satu pintu menggunakan penyemprotan air kondensat pada kondenser di luar kulkas setiap 2 menit sekali. Hal tersebut bertujuan untuk pemanfaatan air kondensat dan meningkatkan kinerja sistem. Setelah dilakukan proses pengukuran dan pengkajian data, kondisi kondenser dengan penyemprotan didapatkan chilling time selama 38 menit dengan data rata-rata saat stabil dari menit ke-30 hingga ke-36 dihasilkan nilai COPaktual sebesar 3,2, COPcarnot 4,21, dan nilai efisiensi sebesar 75,8%, sedangkan pada kondisi kondenser tanpa penyemprotan oleh air kondensat didapatkan chilling time selama 40 menit dengan rata-rata saat stabil dari menit ke-32 hingga ke-38 dihasilkan nilai COPaktual sebesar 2,91, COPcarnot 3,97, dan nilai efisiensi sebesar 73,3%. Dapat disimpulkan bahwa peningkatan sub-cooling menggunakan air kondensat efektif memanfaatkan air kondensat dan meningkatkan kinerja sistem.
STUDI KELAYAKAN THERMOELECTRIC GENERATOR DARI ALUMUNIUM (Al) DAN KARBON (C) SEBAGAI SOLUSI LAIN ENERGI TERBARUKAN
Authors: Aliyu Asniar
Published: May 2022

This study aims to create a prototype of a Thermoelectric Generator which is composed of a set of Aluminum (Al) and Carbon (C) series thermocouples as an alternative energy source. The initial stage in this research is to make a thermoelectric generator that is composed of 120 series thermocouple pairs or consists of 6 thermopiles (20 thermocouple pairs) arranged in series. Then the hot side is given a heat source using an electric iron and the cold side is equipped with a cooling fan and measures the output voltage generated based on changes in the heat generated by the electric iron. The test results show that temperatures up to 50°C produce a DC output voltage with a low increase in voltage change, while above that temperature the output voltage increases significantly. This shows that based on this initial experiment, Al and C thermoelectric generators are feasible to be used as an alternative energy source.
ANALISIS SENSITIVITAS PADA PEMODELAN AIRTANAH MENGGUNAKAN METODE FINITE DIFFERENCE PADA KONDISI STEADY STATE DI KAB BANTUL PROV. YOGYAKARTA
Authors: Satria fitrio  , Agung C Tedy , Dwinagara Barlian , Ansori Muhammad Iqbal
Published: May 2022

Groundwater modeling is a form or digital image both 2D and 3D that can represent or approach the real form in the field. Groundwater modeling is made to show an overview or system of water flow under the ground surface. Groundwater is an important component in the hydrogeological cycle and groundwater management is very necessary so that the sustainability or the groundwater order system can be well maintained in the future. The purpose of this study is to determine the modeling of groundwater and groundwater distribution patterns from the calibration process in steady state conditions using the MODFLOW program. Groundwater modeling calibration used aims to validate the suitability of the model results with field conditions. The calibration is carried out using shallow wells of at least 67 community wells by combining topographic parameters, hydraulic conductivity, recharge, storativity, constant head, and ground water level that have been processed in the Modflow computational program. The results of the sensitivity analysis of modeling calibration are carried out into several stages of calibration scenarios so that the results that are closest to the standard criteria for groundwater models are obtained.

Keyword: Groundwater modeling, Modflow, Calibration, groundwater, steady state
IMPLEMENTASI LOW PASS FILTER PADA PEMBATAS BIDANG KOMUNIKASI SUARA UNTUK MENINGKATKAN KAPASITAS KANAL KOMUNIKASI
Authors: Basuki Arif , Widyastuti Diah Suwarti , Driyo Cipto
Published: May 2022

Audio Low Pass Filter pada sistem komunikasi telepon maupun radio memiliki frekuensi cut-off sebesar 4 KHz. Lebar bidang ini dianggap cukup untuk “memotong” sumber sinyal vokal manusia sebesar 20 KHz. Kebutuhan kanal komunikasi semakin meningkat namun alokasi frekuensi terbatas. Salah satu metode untuk meningkatkan kanal komunikasi adalah “mempersempit” frekuensi cut-off Low Pass Filter. Penelitian ini menggunakan Sallen and Key Butterwworth Low Pass Filter orde 4 dengan frekuensi cut-off divariasi mulai dari 4 KHz sampai 500 Hz. Pada setiap frekuensi cut-off dilakukan pengenalan suara, apakah masih dapat dikenali atau tidak. Hasil penelitian menunjukkan bahwa pemotongan sinyal audio dengan frekuensi cut-off 4 KHz, 3,5 KHz, 3 KHz, dan 2,5 KHz, sinyal masih dapat dikenali, sehingga diperoleh lebar bandwidth 2,5 KHz x 2. Hasil analisis menunjukkan bahwa dengan bandwidth 5 KHz diperoleh peningkatan kapasitas kanal komunikasi sebesar 66,67%.
PERANCANGAN SISTEM BRINE COOLING PADA SHOWCASE DAN KABIN HIDROPONIK UNTUK TANAMAN KANGKUNG (IPOMOEA AQUATICA)
Authors: Lukitobudi Arda Rahardja , Prasetyo Bowo Yuli , Harish M. Fasya Nur , Fadhil Dimas Alif
Published: May 2022

Limited area and pollution in the city and also weather problem can become an obstacle to planting kale (Ipomoea Aquatica). Post harvest storage of kale also usually does not conditioned which quickly wilted and not fresh. To create an optimum environment, it was necessary to control environment factors such as air temperature, humidity, light intensity, growing media temperature and humidity, and the availability of nutrients [2]. Tofu and wood waste as a hydroponic nutrients [1] not all area were available so in this research AB Mix nutrient was used. In this research, refrigerated showcase by brine cooling was used [3][4]. Hydroponic planting system method used in this research was Deep Flow Technique which the kale (Ipomoea Aquatica) was planted in a water layer 4-6 cm deep in conditioned showcase of 20-30 0C and 60% humidity. Brine cooling was used to condition the showcase from seed to post harvest and was observed its growth. Post harvest conditioned storage was also complete the showcase more durable.

By brine cooling system to cool brine in the range of 70C to 170, the product storage cabin was maintained at 8,70C to 10,50C and the showcase cabin was maintained at 20,40C to 23,60C. The brine cooling system has COPactual of 3,98 and COPcarnot of 6,65 with system efficiency of 59,8%.

 

Keywords: Hydroponic, Ipomoea Aquatica, showcase, brine cooling, Deep Flow Technique.
POTENSI LIKUIFAKSI PADA PERENCANAAN PEMBANGUNAN GEDUNG DI DESA TRIHARJO, WATES, KULON PROGO, D.I. YOGYAKARTA
Authors: Suciati Amalia , Yudiantoro Dwi Fitri , Purwanto Purwanto
Published: May 2022

Bahaya ikutan gempa salah satunya adalah likuifaksi. Menyadari kondisi geologi ini pemerintah D.I. Yogyakarta mempertimbangkan dan memperhitungkan risiko dengan melakukan upaya mitigasi, salah satunya dengan mengkaji potensi bahaya likuifaksi pada rencana pembangunan Embarkasi Haji Yogyakarta di Desa Triharjo, Kecamatan Wates, Kabupaten Kulon Progo. Penelitian ini bertujuan untuk mengetahui karakteristik endapan aluvial terhadap potensi likuifaksi pada perencanaan pembangunan Gedung. Metode yang digunakan adalah metode deterministic dan probabilistic. Data yang digunakan adalah data geolistrik, muka air tanah, bor SPT, granulometri dan mekanika tanah. Hasil penelitian menunjukkan faktor keamanan terhadap likuifaksi lapisan 1 (0-1m) FS kritis di Mw 3.7, lapisan 2 (1–6m) FS kritis di Mw 4.5, lapisan 3 (6–9 m) FS kritis di Mw 3.8, lapisan 4 (9–13 m) FS kritis di Mw 3.5 dan lapisan 5 (13–20 m) FS kritis di Mw 3.0. Menginterpretasi likuifaksi daerah tersebut maka dalam pengembangan wilayah ini harus memperhatikan bahaya gempa dan bahaya likuifaksi.