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BERKALA SAINSTEK
Published by Universitas Jember
ISSN : -     EISSN : -     DOI : -
Core Subject : Science, Education, Agriculture,
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Mathematics Physics
Berkala SAINSTEK (BST) merupakan jurnal ilmiah yang memuat artikel hasil penelitian di bidang sains dan teknologi. Secara khusus BST diperuntukan bagi penulis internal mahasiswa Universitas Jember bidang fisika, matematika, biologi, kimia, teknik sipil, teknik mesin, teknik elektro dan sistem informasi. Namun BST juga menerima artikel dari penulis eksternal sepanjang memenuhi kriteria dan dalam lingkup bidang sains dan teknologi.
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Articles 254 Documents
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Evaluasi dan Penilaian Indeks Kondisi Aset Bangunan Gedung Fakultas Keguruan dan Ilmu Pendidikan Universitas Jember Hidayat, Mudzakir Wahyu; Koesoemawati, Dewi Junita; Trisiana, Anita
BERKALA SAINSTEK Vol 8 No 4 (2020)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v8i3.14844

Abstract

Umur bangunan semakin hari semakin tambah tua, tetapi daya tarik secara visual bangunan tidak akan berkurang. Fakultas Keguruan dan Ilmu Pendidikan Universitas Jember, mempunyai 3 kampus meliputi kampus 1, kampus 2 dan kampus 3. Umumnya kampus tersebut sudah berumur lebih dari 15 tahun dan sudah terlalu banyak mengalami kerusakan dari beberapa komponen. F aktor kerusakan gedung salah satunya dapat disebabkan karena kurangnya pemeliharaan dan perawatan bangunan gedung. Pihak Universitas Jember sendiri sudah me laksanakan perawatan dan pemeliharaan supayabangunandapatber fungsi dengan baik, tetapi masih dijumpai beberapa bangunan yang memerlukan perbaikan. Karena banyaknya asset bangunan yang dimiliki, m aka perlu dilakukan evaluasi kondisi terhadap komponen yang ada pada bangunan gedung FKIP dan menentukan prioritas perbaikan dan pemeliharaan berdasarkan kondisi bangunan. Dengan adanya evaluasi ini dapat dijadikan referensi terkait dengan pemeliharaan komponen dan elemen bangunan gedung di FKIP. Pada peneltian ini menggunakan data sekunder dan data primer, data primer menggunakan dua variabel yaitu variabel bebas dan variabel terikat. Variabel terikat yaitu mengidentifikasi kerusakan komponen. Variabel bebas yaitu melakukan penyebaran kusioner terhadap beberapa responden mengenai kondisi komponen bangunan. Setelah itu data yang kita dapatkan di olah menggunakan metode Analytical Hierarchy Process (AHP) dengan bantuan aplikasi expert choice Versi 11 untuk menghasilkan bobot komponen dan kita kolaborasikan dengan hasil volume kerusakan untuk mendapatkan nilai indeks kondisi. Indeks kondisi ini menjadi acuan kita untuk menentukan tingkat kerusakan komponen dan prioritas penanganan komponen. Berdasarkan hasil evaluasi didapatkan beberapa komponen bangunan gedung yang mengalami kerusakan. Hasil penelitian menunjukan komponen bangunan gedung masuk pada kerusakan zona indek 1 antara 85% - 100% baik sekali, dengan indeks kondisi paling kecil terdapat pada gedung kampus 1 sebesar 92,567 % dan indeks kondisi paling besar pada gedung c kampus 3 sebesar 98,896 %. Dan prioritas tertinggi pada komponen keramik bobot nilai 0.143 dan terendah komponen penggantung plafond bobot nilai 0.024. Serta total biaya yang diperlukan untuk perawatan dan pemeliharaan bangunan gedung senilai Rp.177,088,848.
Designing A 3-Dimensional Campus Brochure Application Based On Augmented Reality Dayat, Abd. Rachman; Angriani, Liza
BERKALA SAINSTEK Vol 9 No 2 (2021)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v9i2.21958

Abstract

STMIK Umel Mandiri as one of the universities in Jayapura is still less well known, apart from being relatively new in its age and the location of the campus building which is blocked by buildings. So that people sometimes do not know the exact location of the campus. To promote the campus, one of the advertising media used is brochures. Along with current technological developments, augmented reality technology has emerged which is able to combine 2 (two) realities, namely the real and virtual world. When used in brochures, it can provide a feel and experience for readers. So that promoting goods or services can be done more interactively, as well as providing more information to consumers about the product. This augmented reality technology is then used as a solution to the problems faced by STMIK Umel Mandiri in promoting its educational institutions. The purpose of this research is to produce an android application that can display a 3 (three) dimensional brochure model by utilizing augmented reality technology so that it can help the public to get to know the campus to be chosen well. The research method has several stages, namely collecting data about the needs of prospective new students regarding information about the STMIK Umel Mandiri campus, then making a 3 (three) dimensional model of the STMIK Umel Mandiri Campus Building. Then next, do the design of compatible augmented reality on smartphone devices using the Android operating system, and produce 3 (three) dimensional augmented reality objects. This research produces an application based on augmented reality technology that is used to help promote the STMIK Umel Mandiri Campus through devices with the android operating system.
Analisis Perbandingan Kapasitas Balok Komposit Baja-Beton dengan Steel Headed Stud dan UNP Stud Hayu, Gati Annisa; Mifta, Ahmad; A., Syamsul
BERKALA SAINSTEK Vol 8 No 4 (2020)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v8i4.18621

Abstract

Penghubung geser atau stud memiliki peranan penting dalam menghasilkan perilaku komposit baja-beton. Terdapat dua jenis stud yang direkomendasikan, yaitu steel headed stud atau paku berkepala dan UNP stud atau kanal. Penelitian ini menganalisis perbandingan kapasitas balok komposit baja-beton dengan penghubung geser jenis steel headed stud dan UNP stud. Pemodelan menggunakan program elemen hingga dipilih sebagai metode dalam analisis perilaku non-linier. Luas permukaan kedua jenis penghubung geser dibuat sama sehingga kuat nominal, jumlah, dan jarak pemasangan penghubung geser pun juga akan sama untuk kedua jenis pemodelan ini. Kapasitas yang ditinjau meliputi tegangan pada balok baja WF, tegangan pelat beton, tegangan pada stud, konsentrasi tegangan pada balok baja dan pelat beton, serta defleksi pada balok komposit. Sebelum melakukan pemodelan dengan program elemen hingga, proses desain sesuai SNI 1727:2015 dilakukan terlebih dahulu untuk menentukan dimensi struktur yang akan digunakan. Validasi diperlukan untuk melihat tingkat keakuratan pemodelan yang dilakukan. Metode validasi dilakukan dengan membandingkan nilai tegangan lentur pada serat bagian bawah dan atas balok komposit baja-beton. Persentase pemodelan mencapai 86,95% untuk model steel headed stud dan 87,4% untuk UNP stud. Hasil pemodelan menunjukkan bahwa balok komposit dengan UNP stud memilik kapasitas yang lebih baik karena menghasilkan nilai tegangan-tegangan dan defleksi yang lebih kecil. Tegangan lentur balok baja UNP stud dan steel headed stud adalah 19,129 MPa dan 19,556 MPa (perbedaan 2,18 %). Tegangagan lentur pelat beton UNP stud dan steel headed stud adalah 1,21 MPa dan 1,194 MPa (perbedaan 1,34 %). Defleksi balok komposit dengan UNP stud dan steel headed stud adalah 0.478 mm dan 0,435 mm (perbedaan 8,99 %).
Abundance and potency of Non-Symbiotic Nitrogen-Fixing Bacteria in Padang Sapu-sapu, Pejem Village, Bangka Hermiati, Hermiati; Nurtjahya, Eddy; Mansur, Irdika
BERKALA SAINSTEK Vol 9 No 2 (2021)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v9i2.20057

Abstract

Padang sapu-sapu soil is similar with post-tin mining soil in its white sand texture and poor nutrient. One factor causes the disturbed land in Bangka Belitung islands is tin mining activity. One method to rehabilitate marginal soil is by utilizing the potential nonsymbiotic N2-fixing bacteria, which are able to fertilize the soil and is able to provide macro nutrient. This study aims to measure the abundance and potency of non-symbiotic N2-fixing bacteria in padang sapu-sapu, Pejem Village, Bangka. The site selection is determined by purposive sampling method and interviews and the samples were collected randomly. Isolation used selective media Ashby'`s Monitol Agar and Azospirillum media. Morphological characterization was conducted on isolates and a series selective test was carried out, i.e. hipersentivity test, hemolysis test, IAA phytohormone test and nitrogenase test. The study of the abundance population of non-symbiotic N2-fixing bacteria of two different locations showed that the total bacterial population in padang sapusapu is very small compared to its lowland forest. Isolate Azotobacter sp. TH105(a) from the lowland forests is potential as natural fertilizer.
Study of Rainfall and Water Discharge Spatial Variability Using Exploratory Spatial Data Analysis Method in Bondowoso Regency Faillasuf, Vide Mirza; Halik, Gusfan; Wiyono, Retno Utami Agung
BERKALA SAINSTEK Vol 9 No 1 (2021)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v9i1.16179

Abstract

The difference in rainfall intensity affects the hydrological cycle as a process that greatly determines the amount of water discharge. Thus, in water resources management, it is important to determine the distribution pattern of rainfall and discharge. By studying the characteristics of rainfall distribution patterns and water discharge, the potential of water resources can be illustrated well. This study uses the Exploratory Spatial Data Analysis method to examine spatial variability of rainfall intensity and water discharge in Bondowoso Regency. Rainfall and discharge data are collected from 35 rain stations and 227 weirs in 2008 until 2018. This study produces monthly average rainfall distribution values between 190 mm / month with monthly average discharge between 7300lt/sec/month. Meanwhile, the obtained average annual rainfall distribution values are between 2300 mm/year with annual average discharge values between 105000 lt/sec/month. The spatial distribution map using IDW method produces information on the potential of water resources as follow: the higher the height of a place, the higher the average monthly rainfall, while the lower the height of a place, the higher the average monthly discharge. As for the obtained correlation value between rainfall and discharge is R² = 0.665.
Pengelompokan Spesies Helicotylenchus (Nematoda: Hoplolaimidae) Berdasarkan Karakter Morfologi Alas, Niemah; Gafur, Abdul
BERKALA SAINSTEK Vol 8 No 4 (2020)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v8i4.17988

Abstract

Nematoda genus Helicotylenchus adalah salah satu organisme parasit yang dapat menyebabkan kerusakan pada tanaman dan dapat mengakibatkan penurunan produksi. Untuk genus ini sudah ada kompendium yang mencakup beberapa karakter diagnostik yang dapat dimanfaatkan untuk identifikasi. Akan tetapi, karena tidak ada pengelompokan spesies, maka pemanfaatan itu belum bisa terwujud. Penelitian ini dilakukan untuk melakukan pengelompokan spesies-spesies Helicotylenchus berdasarkan karakter morfologi panjang tubuh, Dorsal Oesophageal Gland Opening (DGO), panjang stilet, jumlah anulus kepala, dan jumlah anulus ekor. Pengelompokan dilakukan dengan memvisualisasi data kisaran setiap karakter menjadi hi-lo-close stock chart dengan menggunakan MS Excel. Hasil pengelompokan dengan karakter panjang tubuh terbentuk enam kelompok, DGO tujuh kelompok, panjang stilet tujuh kelompok, jumlah anulus kepala lima kelompok, dan jumlah anulus ekor lima kelompok. Pengelompokan yang paling jelas adalah berdasarkan karakter panjang tubuh. Pengelompokan ini diharapkan dapat membantu identifikasi nematoda genus Helicotylenchus sehingga kajian mengenai spesies genus ini dapat terfasilitasi.
Synthesis and Characterization of Bacterial Cellulose-Polyaniline Composite with Variation of Dopant Concentration Ummami, Riza; Busroni, Busroni; Piluharto, Bambang
BERKALA SAINSTEK Vol 9 No 2 (2021)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v9i2.18120

Abstract

Polyaniline is a type of conductive polymer. Bacterial cellulose has high mechanical properties, so it can be made into polyaniline base composite materials. A stable form of polyaniline oxidation at room temperature is emeraldine base. The emeraldine base has a conductivity value of 10-6 S/cm. Dopants can change the shape of emeraldine base to emeraldine salt by protonation process. Emeraldine salt is a conductive form of polyaniline. The conductivity value of emeraldine salt is 0,03-0,07 S/cm. The addition of dopan in synthesis of polymer was carried out to determine its effect on the conductivity value. The disadvantage of polyaniline is that its mechanical properties are weak and easily brittle. Modifications are needed to improve the mechanical properties of polyaniline, one of which is the manufacture of composite. Bacterial celluloce has high mechanical properties so it can be made into polyaniline base composite materials. Synthesis of bacterial cellulose-polyaniline composites by in situ chemical polymerization methods. Syntehsis is started with BC membrane was dipped into aniline solution for about 2h with stirring at room temperature. The BC was immersed into ammonium peroxydisulfate solution for about 30m with stirring. The bacterial cellulose-polyaniline compositions obtained are black color which is characteristic of the emeraldine salt. The highest conductivity value of composite was obtained from the addition of 3,5M HCl dopant which was 4,70x10-4 S/cm. FTIR analysis of composite obtained peak of the characteristic polyanilin was conductive at 1565,92 cm-1 as C=C quinoid ring and 1442,95 cm-1 as C=C benzoid ring.
Genetic Study of Phenylthiocarbamide (PTC) Taste Sensitivity In Population of The Osing in Kemiren Village-Banyuwangi Indriani, Fenny; Oktarianti, Rike; Wathon, Syubbanul
BERKALA SAINSTEK Vol 9 No 1 (2021)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v9i1.19844

Abstract

The ability to taste phenylthiocarbamide (PTC), is autosomal trait inherited in a simple Mendelian recessive pattern. The frequency of Taster and non-Taster allele is varies in different populations. The purpose of the research is to investigate the prevalence, gene frequency and genotype frequency of taster (T) and non taster (ts of Osing population in Kemiren-Banyuwangi. PTC serial dilution method was used to assess the PTC Taster and non-Taster phenotypes. The Hardy–Weinberg method was used to determine allele frequencies. The total of samples were 227 people, male were 117 and female were 110 with age range of 15–30 years were randomly selected. The result showed that the Osing population as Taster were 210 (92,52%) and non Taster were 17samples (7,48%) . The allele frecuency of Taster (T) was 0,73 and non Taster (t) was 0,27 respectively. The genotype frequency of dominant Taster (TT) was 0,54, heterozygosity Taster (Tt) was 0,39, and genotype of non Taster (tt) was 0,07.
Information System Security Audit Based on the DSS05 Framework Cobit 5 at Higher Education XX Sinaga, Rudolf; Samsinar, Samsinar; Afriany, Renny
BERKALA SAINSTEK Vol 9 No 1 (2021)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v9i1.20361

Abstract

Currently, information has become a commodity or basic need, it can even be said that we are already in an "information-based social" era. It is undeniable that the ability to access and ensure the availability of information quickly and accurately has become a very essential component for an organization, whether in the form of social or commercial organizations, educational institutions such as universities, government agencies, and individuals. Various channels were created to regulate access rights to information, to prevent unauthorized people from accessing it, to minimize losses for the owner of the information. Based on the results of interviews with the research object of XX college, there are still frequent disruptions to information system security such as attacks on servers that result in server downtime, attacks on institutional e-mails that result in being unable to receive or even send e-mails, and other disturbances. This certainly harms information services at the tertiary institution, therefore an information system security audit is required. This study aims to measure the level of information system security capabilities using the Cobit 5 framework in the APO13 and DSS05 domains. Based on the results of the audit, it was found that the GAP value was 3.6 for the APO13 domain or at level 1 while 3.4 for the GAP DSS05 value or at level 2, it can be concluded that the information system security maturity level is still very low so that it needs improvement. It is recommended to make SOPs and documentation of maintenance, control, and periodic security evaluation, install an antivirus that has high and up to date protection accuracy, and make regular maintenance reports both on software and hardware.
Prevalensi Buta Warna Siswa Sekolah Menengah Atas di Kota Jember Oktarianti, Rike; Wathon, Syubbanul; Wulandari, Ayu Dwi
BERKALA SAINSTEK Vol 8 No 4 (2020)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v8i4.18127

Abstract

Buta warna merupakan kelainan genetis yang menyebabkan ketidakmampuan seseorang dalam membedakan warna seperti warna merah, biru, dan hijau. Buta warna merah-hijau merupakan salah satu tipe buta warna yang paling sering terjadi. Kelainan ini disebabkan oleh alel resesif c (color blind) yang terangkai pada kromosom X. Penelitian ini bertujuan untuk mengetahui prevalensi buta warna siswa SMA di Kota Jember. Penelitian ini dilaksanakan pada siswa kelas XI SMAN di Kota Jember yaitu SMAN 1, SMAN 2, SMAN 3, SMAN 4, dan SMAN 5 dengan pengambilan sampel secara acak sebanyak 353 siswa. Tes buta warna pada siswa menggunakan buku Ishihara. Analisis data dilakukan untuk mengetahui prevalensi buta warna, frekuensi alel, dan untuk menguji hukum kesetimbangan genetik Hardy-Weinberg menggunakan uji Chi-Square pada taraf signifikasi 0,05. Berdasarkan hasil penelitian ini diketahui bahwa prevalensi buta warna siswa SMA di Kota Jember adalah 3,68%, dengan frekuensi alel buta warna 0,09 dan alel normalnya adalah 0,91. Hasil pengujian kesetimbangan genetik Hardy-Weinberg menunjukkan nilai Chi-Square 1,74 pada derajat bebas = 3, dengan nilai probabilitas antara 0,80 dan 0,50 yang menujukkan tidak ada penyimpangan yang signifikan. Kesimpulannya adalah frekuensi genotip dan frekuensi alel buta warna pada siswa SMA di Kota Jember sesuai dengan hukum kesetimbangan genetik Hardy-Weinberg.

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