bluuebunny/crossref_metadata_2025 huggingface dataset:
Identifikasi Escherichia coli yang Resistan Antibiotik pada Daging Burger yang Dijual di Sekitar Kampus IPB Dramaga Bogor
Authors: Asari Kumala Andri , Lukman Denny Widaya , Purnawarman Trioso
Published: February 2022

Penelitian ini bertujuan untuk mengetahui cemaran Escherichia coli dan resistansinya terhadap antibiotik pada sampel daging burger yang dijual pada radius 2 km batas Kampus Institut Pertanian Bogor di Dramaga, Bogor. Sebanyak 35 sampel daging burger diperoleh dari semua pedagang burger (tujuh pedagang). Isolasi dan identifikasi E. coli mengacu pada Standar Nasional Indonesia 2897:2008. Uji resistansi terhadap antibiotik menggunakan metode Kirby-Bauer dengan acuan dari Clinical Laboratory Standards Institute tahun 2018. Uji resistansi antibiotik dilakukan terhadap semua isolat E. coli yang didapat dari semua koloni E. coli yang diisolasi dari sampel daging burger. Antibiotik yang digunakan dalam penelitian ini adalah ampisilin, amoksisilin, streptomisin, oksitetrasiklin, tetrasiklin, sefotaksim, gentamisin, enrofloksasin, asam nalidiksat, kloramfenikol, dan trimetoprim-sulfametoksasol. Data dianalisis secara deskriptif. Hasil pengujian menunjukkan11,4% (4 dari 35 sampel) positif E. coli. Isolat yang diperoleh dari empat sampel ada lima isolat E. coli (100%) yang resistan terhadap antibiotik yang diuji. Resistansi tertinggi ditemukan pada antibiotik streptomisin (100%) dan gentamisin (80%). Dari lima isolat E. coli yang didapat, empat isolat di antaranya telah resistan terhadap tiga atau lebih golongan antibiotik yang dikenal sebagai multi-drug resistant (MDR), dengan pola resistansi yang terdiri atas AMP-AMC-S-CN (ampisilin-amoksisilin-streptomisin-gentamisin), AMP-S-ENR-NA-SXT-CN (ampisilin-streptomisin-enrofloksasin-asam nalidiksat-trimetoprim sulfametoksasol-gentamisin), dan AMP-S-ENR-NA-SXT-OT-CN (ampisilin-streptomisin- enrofloksasin-asam nalidiksat- trimetoprim sulfametoksasol-oksitetrasikilin-gentamisin). Keberadaan E. coli resistan pada daging burger yang termasuk pangan siap santap (ready-to-eat food) dapat menimbulkan risiko kesehatan pada konsumen.
Kuning Telur Ayam Kampung Dapat Digunakan Sebagai Emulsifier Minyak Cengkeh untuk Bahan Anestetik pada Ikan Komet
Authors: Putra Deo Lauda , Sudisma I Gusti Ngurah , Wirata I Wayan
Published: February 2022

Penelitian ini bertujuan untuk mengetahui efektivitas campuran minyak cengkeh dengan kuning telur ayam kampung sebagai anestetik pada ikan komet (Carassius auratus auratus). Objek penelitian yang digunakan adalah 36 ekor ikan komet, berukuran 10 ± 5 cm, bobot badan 15-25 g, dan diberi pakan pellet. Data pada penelitian ini diperoleh dengan mencatat lama waktu teranestesinya ikan. Hewan coba dibagi menjadi sembilan kelompok perlakuan yaitu: perlakuan I (minyak cengkeh 100 ppm), perlakuan II (minyak cengkeh 100 ppm + etanol 96% 1 mL/L), perlakuan III (minyak cengkeh 100 ppm + kuning telur 0,4 mL/L), perlakuan IV (minyak cengkeh 100 ppm + kuning telur 0,6 mL/L), perlakuan V (minyak cengkeh 100 ppm + kuning telur 0,8 mL/L), perlakuan VI (minyak cengkeh 100 ppm + kuning telur 1 mL/L), perlakuan VII (minyak cengkeh 100 ppm + kuning telur 1,2 mL/L), perlakuan VIII (minyak cengkeh 100 ppm + kuning telur 1,4 mL/L), perlakuan IX (minyak cengkeh 100 ppm + kuning telur 1,6 mL/L). Masing-masing perlakukan dilakukan pengulangan sebanyak empat kali. Data yang diperoleh dianalisis dengan sidik ragam dan dilanjutkan dengan uji jarak berganda Duncan. Berdasarkan hasil penelitian diperoleh bahwa masing-masing kelompok perlakuan menunjukkan waktu induksi berbeda nyata (P<0,05) sedangkan waktu durasi dan waktu pemulihan tidak berbeda nyata (P>0,05). Induksi anestesi pada ikan komet dengan waktu induksi tercepat adalah 3,05 ± 0,32 menit menggunakan kombinasi minyak cengkeh 100 ppm + kuning telur 1,6 mL/L.
Pemberian Gonadotropin Releasing Hormone Meningkatkan Konsentrasi Hormon Testosteron pada Domba Waringin
Authors: Armansyah Teuku , Putri Sara Febria , Oktaviany Oppi , Siregar Tongku Nizwan , Syafruddin Syafruddin , Panjaitan Budianto , Sayuti Arman
Published: February 2022

Salah satu upaya untuk meningkatkan konsentrasi testosteron adalah dengan pemberian gonadotropin releasing hormone (GnRH). Peningkatan testosteron menyebabkan peningkatan kualitas spermatozoa. Penelitian ini bertujuan mengetahui pengaruh pemberian gonadotropin releasing hormone (GnRH) terhadap peningkatan kualitas semen dan level testosteron domba waringin. Dalam penelitian ini digunakan tiga ekor domba waringin dengan rancangan pola bujur sangkar latin 3 x 3 sehingga hewan percobaan menerima suntikan NaCl fisiologis sebagai kontrol (K0), 50 ìg GnRH (K1), dan 100 ìg GnRH (K2). Penampungan semen dilakukan satu kali ejakulasi/minggu, selama tiga minggu. Sampel semen dikoleksi menggunakan elektroejakulator 24 jam setelah perlakuan dan diamati warna, konsistensi, volume, motilitas, konsentrasi, viabilitas, dan abnormalitas spermatozoa. Koleksi darah untuk pemeriksaan konsentrasi hormon testosteron dilakukan 60 menit setelah penyuntikan GnRH. Analisis konsentrasi testosteron dilakukan menggunakan metode enzyme linked immunosorbent assay (ELISA). Data mengenai warna dan konsistensi semen dilaporkan secara deskriptif, sedangkan level testosteron, volume semen, motilitas, konsentrasi, viabilitas dan abnormalitas spermatozoa dianalisis dengan analisis varian. Hasil pengamatan menunjukkan bahwa warna dan konsistensi semen yang dikoleksi pada semua kelompok perlakuan adalah krem dengan konsistensi kental. Hasil analisis statistika menunjukkan bahwa volume semen, konsentrasi spermatozoa, motilitas spermatozoa, viabilitas spermatozoa dan abnormalitas spermatozoa setelah pemberian GnRH menunjukkan perbedaan yang tidak signifikan (P>0,05). Rata-rata (±SD) konsentrasi testosteron pada kelompok K0, K1, dan K2 masing-masing adalah 1,82±1,08; 8,05+2,24; dan 8,81±1,09 ng/mL (P<0,05). Disimpulkan bahwa pemberian GnRH tidak memengaruhi kualitas semen namun dapat meningkatkan konsentrasi hormon testosteron pada domba waringin.
COMMON QUADRATIC LYAPUNOV FUNCTIONS FOR TWO STABLE MATRICES
Authors: YILMAZ Şerife
Published: February 2022

In this paper we consider the problem of existence and evaluation of common solutions to Lyapunov equations for switched systems consisting of two real or complex matrices. Conditions for existence and solution algorithm based on the gradient of a matrix function are given. Number of examples are provided.
Curved Space: Theory of Everything
Authors: Chen S.
Published: February 2022

Matter and energy are both converted from curved space, they are different forms of the same thing. The flow of space creates the gravitation, and the increase of space causes the expansion of the universe. Matter curves in two different directions of one dimension creates two types of electric charges: positive and negative. Matter curves in three different dimensions creates three values or charges of quark's color: red, green, and blue. The equivalent equation of space: S=Ec2=mc4. The gravitation of hollow sphere space: Sμν=4πGm=(4/3)π((r+a)3-r3).
Indicator Minerals, Pathfinder Elements, and Portable Analytical Instruments in Mineral Exploration Studies
Authors: V. Balaram , S. Sawant S.
Published: February 2022

Until recently, the classic approach to mineral exploration studies is to bring the field samples/drill cores collected during field studies to the laboratory followed by laborious analysis procedures to generate the analytical data. This is very expensive, time consuming and difficult for exploring vast areas. But rapid technological advances in field portable analytical instruments such as portable ultraviolet–visible and near-infrared spectrophotometers, gamma ray spectrometer, pXRF, pXRD, pLIBS, and µRaman spectrometer have changed this scenario completely and increased their on-site applications in mineral exploration studies. These instruments are currently providing direct, rapid, on-site, real-time, non-destructive, cost-effective identification, and determination of target elements, indicator minerals and pathfinder elements in rock, soil, and sediment samples. These portable analytical instruments are currently helping to obtain accurate chemical and mineralogical information directly in field with minimal or no sample preparation, and providing decision-making support during field work as well as during drilling operations in several successful mineral exploration programs. In this article, the developments in these portable devices, and their contributions in the platinum group elements (PGE), rare earth elements (REE), gold, base metals, and lithium exploration studies both on land and on ocean bed have been summarized with examples.
Presence of Crystals in the Synovial Fluid of Patients With Psoriatic Arthritis
Authors: Popova-Belova Stanislava Dimitrova , Geneva-Popova Mariela Gencheva , Popova Velichka Zaharieva , Kraev Krasimir Iliev , Batalov Anastas Zgurov
Published: February 2022

Analyzing synovial fluid from joints affected by the pathological process of psoriatic arthritis is part of the overall patient examination, since it may have differential diagnostic significance. The purpose of this study was to assess the presence of crystals in the synovial fluid of psoriatic arthritis patients as biomarkers for disease activity. Materials and methods: The synovial fluid of 156 patients with proven PSA diagnosis (patients covered CASPAR criteria) was analyzed over 24 months and compared to 50 patients with activated gonarthrosis. The Leica DM4500P polarization microscope (Leica Microsystems, Germany) was used for crystal detection. Pain and disease activity measures were also evaluated (PSA VAS for pain, DAPSA, PASDAI, mCPDAI, and HAQ-DI). The statistical analysis was carried out using SPSS version 26 with a significance set at p < 0.05. Results: The macroscopic appearance of synovial fluid from patients with psoriatic arthritis was clear in 84.6% of the patients. Synovial fluid crystals were found in 23.71% of patients with psoriatic arthritis - predominantly monosodium urate (67.58%) but also calcium pyrophosphate (21.62%) and lipid drops (5.4%). The presence of monosodium urate crystals significantly correlates with all pain and disease activity measures – VAS for pain, DAPSA, PASDAI, mCPDAI, and HAQ-DI. In 67.56% of patients with established crystals treatment with an anti-TNF blocker was started at the discretion of the treating rheumatologist due to high levels of disease activity. Conclusion: Examining the synovial fluid in PSA patients is a necessary minimally invasive procedure in cases of joint effusion, since the presence of synovial fluid crystals is a significant indicator of disease severity. The current analyses demonstrate that the presence of synovial fluid crystals in PSA patients can be used as a biomarker for disease severity and the necessity to commence biological treatment (most often TNF-a-blocker).
A Chaotic Bio-Mechanics Model for the Optimization of Dairy Industry
Authors: Liu Meng , Meng Kexin , Mei Shuli , Xing Ruyi
Published: February 2022

In the dairy industry a fundamental role is played by an efficient milk production, therefore even a slight shrinking in the production might have a significant consequence both on the industry profits and on the society. Milk is, in fact, one of the most common foods, and a fundamental support in the nutrition so that the lacking of milk should be avoided. An efficient milk production depends on various factors, but in particular it depends on the good health and supply of the dairy cow. However, in order to increase the milk production, cows are overfeed thus increasing their weight. Unfortunately, the overweight of the cows might easily damage their bones. In particular, the knee bones are fragile and they can easily swell and break. In order to analyze the knee bones and to compute a threshold leading to a damage, in this paper we study a bio-mechanical model of the knee joint and study the corresponding dynamical system. A novel dynamical model of dairy cow leg is constructed, in which the knee is represented by a complex structure of sliding and rolling. Then, the dynamic characteristics of the structure is analyzed by some numerical simulation. The results of the experiments shows that the solutions of the dynamical system might lead to a chaotic behavior. The evolution to chaos it explains the rising of various pathological features thus reducing the milk production.
Bullied Because of Their Teeth: Evidence from a Longitudinal Study on the Impact of Oral Health on Bullying Victimization Among Australian Indigenous Children
Authors: Islam Md Irteja , Chadwick Verity , Esgin Tuguy , Martiniuk Alexandra
Published: February 2022

Making life better for Indigenous peoples is a global priority. Although bullying and oral health have always been a topic of concern, there is limited information regarding the impact of this problem in the general population, with no evidence in this regard among the Australian Indigenous population. Thus, we aimed to quantify the relationship between bullying victimization and oral health problems by remoteness among 766 Australian Indigenous children aged between 10–15-year-olds using data from the LSIC study. Bivariate and multilevel mixed-effect logistic regression analyses were employed. Findings indicated children self-reported bullying more than parents reported their children were being bullied (44% vs 33.6%), with a higher percentage from rural/remote areas than urban areas. Parents reported oral health problem increases the probability (OR 2.20, p<0.05) of being bullied in Indigenous children living in urban areas. Racial discrimination, lower level of parental education and poor child oral hygiene increase the risk of bullying victimization. Parental happiness with life and a safe community was associated with a lower risk of bullying. Dental problems are linked with Australian Indigenous children experiencing bullying victimization. Cultural resilience and eliminating discrimination maybe two modifiable paths to ameliorating health issues associated with bullying in the Australian Indigenous community.
Majorana Anyon Composites in Magneto-Photoluminescence Spectra of Natural Quantum Hall Puddles
Authors: Mintairov Alexander. M. , Lebedev Dmitrii , Vlasov Alexei , Blundell Steven
Published: February 2022

In magneto-photoluminescence (magneto-PL) spectra of quasi-two dimensional islands (quantum dots) having seven electrons and Wigner-Seitz radius rs~1.5, we revealed a suppression of magnetic field (B) dispersion, paramagnetic shifts and jumps of the energy of the emission components for filling factors >1 (B<10 T). Additionally, we observed B-hysteresis of the jumps and a dependence of all these anomalous features on rs. Using a theoretical description of the magneto-PL spectra and an analysis of the electronic structure of these dots based on the single-particle Fock-Darwin spectrum and many-particle configuration-interaction calculations, we show that these observations can be described by the rs-dependent formation of the anyon (magneto-electron) composites (ACs) involving single-particle states having non-zero angular momentum and that the anyon states observed involve Majorana modes (MMs), including zero-B modes having equal number of vortexes and anti-vortexes, which can be considered as Majorana anyons. We show that the paramagnetic shift corresponds to a destruction of the equilibrium self-formed ~5/2 AC by the external magnetic field and that the jumps and their hysteresis can be described in terms of Majorana qubit states controlled by B and rs. Our results show a critical role of quantum confinement in the formation of magneto-electrons and implies the liquid-crystal nature of fractional quantum Hall effect states, Majorana anyon origin of the states having even , i.e., composite fermions, which provide new opportunities for topological quantum computing.
Modeling the responses of Coffee (Coffea arabica L.) distribution to current and future climate change in Jimma Zone, Ethiopia
Authors: Chalchissa Fedhasa Benti , Diga Girma Mamo , Tolossa Alemayehu Regassa
Published: February 2022

Coffee arabica species have already been affected by climate change, with socioeconomic implications. Smallholder farmers have encountered and will continue to confront issues in maintaining their coffee plants' productivity. This study aimed to determine which bio-climatic characteristics are most beneficial to coffee production in current and future climate change scenarios. The responses of coffee distribution to climatic conditions were studied under the current, moderate representative concentration (RCP4.5), and worst representative concentration (RCP8.5) pathways using a bioclimatic modelling approach or the Maxent model. Multiple regression models (path and response optimizers) were used to parameterize and optimize the logistic outputs of plant distribution. Results showed that climatic factors such as total precipitation, precipitation seasonality, and mean temperature are the most important climatic factors in determining the success of C. arabica farming. Under the current conditions, total precipitation significantly benefits C. arabica whereas precipitation seasonality significantly affects it (P < 0.001). In the current condition, coffee responded neither negatively nor positively to the mean temperature, but positively in RCP4.5 and RCP8.5. It would also respond positively to increased total precipitation under RCP4.5 but negatively to rising precipitation under the RCP8.5. The average five top-optimal multiple responses of C. arabica were 75.8, 77, and 70% for the present, RCP4.5, and RCP8.5, respectively. The positive response of C. arabica to bioclimatic variables in the RCP4.5 scenario is projected to be much bigger than in the present and RCP4.5 scenarios (P < 0.001). As precipitation and temperature-related variables increase, the cultivation of C. arabica will increase by 1.2% under RCP4.5 but decrease by 5.6% under RCP8.5. A limited number of models and environmental factors were used in this study, suggesting that intensive research into other environmental aspects is needed using different models.
Hubungan Antara Efikasi Diri (Self Efficacy) dengan Kepuasan Hidup (Life Satisfaction) Mahasiswa
Authors: Nabila Tessa , Wahyuni Eka
Published: February 2022

Penelitian ini bertujuan untuk melihat apakah ada hubungan positif antara efikasi diri dan kepuasan hidup pada mahasiswa Fakultas Ilmu Pendidikan Universitas Negeri Jakarta. Penelitian ini menggunakan metode penelitian kuantitatif dengan teknik pengambilan sample yaitu incidental sampling. Sample penelitian berjumlah 361 mahasiswa Fakultas Ilmu Pendidikan Universitas Negeri Jakarta. Penelitian ini menggunakan alat ukur dalam bentuk kuesioner yaitu General Self Efficacy Scale untuk variabel efikasi diri dan Multidimensional Students’ Life Satisfaction Scale untuk variabel kepuasan hidup. Pada variabel efikasi diri mahasiswa Fakultas Ilmu Pendidikan Universitas Negeri Jakarta memiliki tingkat efikasi diri sedang dan ditandai dengan jumlah persentase 64% dengan aspek tertinggi yaitu pada aspek effort dengan persentase 32%. Sedangkan pada variabel kepuasan hidup berada pada kategori sedang dan digambarkan dengan persentase 50% dan aspek tertinggi ada pada family dengan persentase sebesar 23%. Semua uji coba dalam penelitian ini menggunakan tingkat signifikansi .05. Secara umum terdapat hubungan antara efikasi diri dengan kepuasan hidup dengan hasil uji korelasionel yaitu hasil .398 uji korelasi ini masuk pada kategorisasi rendah sehingga hubungan antara kedua variabel tidak begitu signifikan. Dapat disimpulkan bahwa terdapat hubungan positif  yang tidak signifikan antara efikasi diri dengan kepuasan hidup mahasiswa Fakultas Ilmu Pendidikan
Pengaruh Model Pembelajaran Creative Problem Solving dalam Pembelajaran Jarak Jauh terhadap Kemampuan Pemecahan Masalah Matematis Siswa SMP Negeri 3 Jakarta
Authors: Naila Nur Fadhila
Published: February 2022

Tujuan dari penelitian ini adalah untuk menguji pengaruh model pembelajaran Creative Problem Solving dalam pembelajaran jarak jauh terhadap kemampuan pemecahan masalah matematis siswa SMP Negeri 3 Jakarta. Penelitian ini mempergunakan metode quasi-experiment dengan posttest-only control group design. Teknik pengambilan sampel dengan two stage random sampling menggunakan cluster random sampling dan simple random sampling. Instrumen yang dipergunakan ialah tes kemampuan pemecahan masalah matematis pada materi perbandingan berupa 4 soal uraian yang telah diuji validitas dan reliabilitasnya. Berdasar pada hasil analisis data mempergunakan uji-t didapatkan  sebesar 3,765 dan sebesar 1,665 sehingga tolak H0 dengan taraf signifikansi  dengan nilai Cohen’s effect size senilai 0,858 yang terhimpun pada kategori besar dengan persentase 79%. Dengan demikian, dapat dipaparkan bahwa terdapat pengaruh signifikan dari model pembelajaran Creative Problem Solving terhadap kemampuan pemecahan masalah matematis siswa dalam PJJ di SMP Negeri 3 Jakarta pada materi perbandingan.
Pengaruh Model Pembelajaran Student Teams Achievement Divisions (STAD) pada Pembelajaran Jarak Jauh terhadap Kemampuan Penalaran Matematis Di SMPIT Avicenna Bekasi Utara
Authors: Azzahrah Fathimah
Published: February 2022

Penelitian ini dilakukan untuk mengetahui apakah terdapat pengaruh model pembelajaran STAD pada pembelajaran jarak jauh terhadap kemampuan penalaran matematis siswa. Penelitian dilaksanakan di SMPIT Avicenna Bekasi Utara pada kelas VII semester genap tahun pelajaran 2020/2021 pada pokok bahasan Segiempat dan Segitiga. Metode penelitian yang digunakan adalah quasi experiment. Pengambilan sampel menggunakan teknik simple random sampling. Teknik simple random sampling dilakukan dengan memilih secara acak dua kelas dari empat kelas yang berdistribusi normal, heomogen, dan memiliki kesamaan rata-rata untuk dijadikan sebagai kelas eksperimen (model pembelajaran kooperatif tipe STAD) dan kelas kontrol (model pembelajaran konvensional). Instrumen penelitian yang digunakan adalah tes akhir kemampuan penalaran matematis pada pokok bahasan Segiempat dan segitiga sebanyak 6 butir soal uraian yang telah melalui uji validitas isi, konstruk dan empiris. Berdasarkan hasil pengujian prasyarat analisis data sebelum perlakuan, kelas eksperimen dan kelas control berdistribusi normal dan homogen. Oleh karena itu, pengujian hipotesis statistik menggunakan uji-t dengan taraf sigifikanasi
Pengaruh Model Pembelajaran CORE (Connecting, Organizing, Reflecting, Extending) terhadap Kemampuan Koneksi Matematis Siswa di SMP Negeri 206 Jakarta
Authors: Nugroho Sigit Galih
Published: February 2022

Penelitian ini bertujuan untuk mengetahui apakah terdapat pengaruh signifikan penerapan model pembelajaran CORE (Connecting, Organizing, Reflecting, Extending) terhadap kemampuan koneksi matematis siswa. Penelitian ini dilakukan pada siswa kelas delapan di SMP Negeri 206 Jakarta semester genap tahun ajaran 2019/2020 pada materi Pythagoras. Metode penelitian yang digunakan adalah quasi experimental design (eksperimen semu). Pengambilan sampel menggunakan teknik simple random sampling. Teknik simple random sampling dilakukan dengan memilih secara acak dua dari empat kelas berdistribusi normal, homogeny, dan memiliki kesamaan rata-rata untuk dijadikan sebagai kelas eksperimen (model pembelajaran CORE (Connecting, Organizing, Reflecting, Extending)) dan kelas kontrol (model pembelajaran konvensional). Instrument penelitian yang digunakan adalah tes kemampuan koneksi matematis pada materi Pythagoras sebanyak 4 soal uraian. Sebelum digunakan, instrument tersebut telah melalui uji validitas isi, validitas konstruk, dan validitas empiris. Perhitungan reliabilitas dilakukan menggunakan rumus Alpha Cronbach dan diperoleh koefisien reabilitas sebesar  yang termasuk dalam kategori tinggi. Berdasarkan perhitungan data hasil penelitian, data kedua kelas berasal dari populasi berdistribusi normal dan memiliki varians yang sama atau homogen. Oleh karena itu, pengujian hipotesis statistik dilakukan menggunakan statistik uji-t dengan varians yang sama. Berdasarkan hasil pengujian hipotesis diperoleh nilai , yang artinya tolak  pada taraf signifikansi . Dengan demikian dapat disimpulkan bahwa terdapat pengaruh signifikan model pembelajaran CORE (Connecting, Organizing, Reflecting, Extending) terhadap kemampuan koneksi matematis siswa SMP Negeri 206 Jakarta pada materi Pythagoras dengan taraf signifikansi  0,05.
Analisis Faktor-Faktor Kesulitan Belajar Matematika Siswa Pada Masa Pandemi Covid-19
Authors: Rismawati Melinda
Published: February 2022

Penelitian ini bertujuan untuk mengetahui faktor-faktor yang menjadi kesulitan belajar matematika siswa pada masa pandemi covid-19 di SMPN 3 Sungai Tebelian. Bentuk penelitian ini adalah analisis faktor eksploratori.Subjek penelitian ini adalah siswa kelas VII A dan VIII A SMPN 3 Sungai Tebelian yang berjumlah 60 orang.Alat pengumpulan data yang digunakan dalam penelitian ini yaitu angket dan dokumentasi.Berdasarkan Observasi awal yang ditemukan, kesulitan belajar matematika siswa pada masa pandemi covid-19 di SMPN 3 Sungai Tebelian karena faktor internal dan faktor eksternal siswa.Maka dari itu, hasil penelitian ditemukan faktor-faktor kesulitan belajar matematika pada masa pandemi covid-19 yaitu dipengaruhi oleh faktor minat, faktor lingkungan sekitar, faktor pembelajaran daring, faktor kesadaran diri, faktor kemampuan dan faktor kesehatan jasmani dan rohani.
ANALYSIS OF MATHEMATIC HIGH ORDER THINKING SKILLS (HOTS) PROBLEMS BASED ON COGNITIVE LEVEL INDICATORS ON BLOOM TAXONOMY
Authors: LIA AMALIA
Published: February 2022

Abstract. This study aims to analyse the questions of high order thinking skills in the Statistics chapter in 2013 curriculum Mathematics textbook which are measured based on indicators of cognitive levels in Bloom's taxonomy. The object of this study is the questions in the Statistics chapter in the Mathematics textbook which is 3 questions. The question analysis technique is based on problem solving with details of competency standards, question indicators, HOTS indicators, Questions and Answer Keys.

 

Keywords: High Order Thinking Skills, Statistics, Bloom's Taxonomy
Pengaruh Penerapan Model Pembelajaran Thinking Aloud Pair Problem Solving (TAPPS) terhadap Kemampuan Pemecahan Masalah Matematika
Authors: Nusywari Widya , Prayitno Sudi , Junaidi Junaidi , Hikmah Nurul
Published: February 2022

This study aims to determine the effect of the Thinking Aloud Pair Problem Solving (TAPPS) learning model on the mathematical problem solving abilities of eighth grade students of SMP. This research is a quasi-experimental research with Non-Equivalent Control Group Design. The population in this study were all eighth grade students of SMP. In determining the sample, the saturated sample technique was used, where the samples in this study were class VIII-A as the control class and class VIII-B as the experimental class. The instrument used in this research is a test of mathematical problem solving ability on number pattern material. Quantitative data analysis was performed using a gain t-test. The results of data analysis obtained thitung = 2.14 and ttable = 2.064 so that thitung > ttable then H0 is rejected which indicates that there are differences in students' mathematical problem solving abilities between classes that receive TAPPS learning and direct learning. This shows that learning with the TAPPS model has an effect on the mathematical problem solving abilities of eighth grade students of SMP. The influence of the application of the Thinking Aloud Pair Problem Solving (TAPPS) learning model on the mathematical problem solving ability of class VIII students at SMP on the number pattern material using the effect size formula (d) is 1.907, which means that the effect given has a high category.
Exposure to Inclusive Language and Well-Being at Work Among Transgender Employees in Australia, 2020
Authors: Perales Francisco , Ablaza Christine , Elkin Nicki
Published: February 2022

Objectives. To provide empirical evidence of the positive effects of exposure to inclusive language on trans employees’ well-being.

Methods. We leveraged unique data from a large Australian national survey of workplace diversity and inclusion (2020 Australian Workplace Equality Index Employee Survey), focusing on a subset of trans respondents (n = 453). We derived self-reported and aggregate-level measures of exposure to trans-inclusive language and created a multidimensional index of employee well-being. We examined their relationships using fully adjusted random-intercept multilevel regression models.

Results. We found strong, positive, and statistically significant associations between different indicators of exposure to inclusive language at work and trans employees’ well-being. These relationships were large in magnitude and emerged in the presence of an encompassing set of sociodemographic and workplace controls, including other markers of workplace diversity and inclusion (e.g., victimization experiences and identity disclosure).

Conclusions. Our results provide robust evidence indicating that efforts to foster inclusive language at work can yield substantial, positive effects on trans people’s feelings of belonging and inclusion, thereby contributing to their overall socioeconomic integration. (Am J Public Health. 2022;112(3):482–490. https://doi.org/10.2105/AJPH.2021.306602 )
Shoulder Periprosthetic Joint Infection and All-Cause Mortality: A Worrisome Association
Authors: Austin Daniel C. , Townsley Sarah H. , Rogers Thomas H. , Barlow Jonathan D. , Morrey Mark E. , Sperling John W. , Sanchez-Sotelo Joaquin
Published: February 2022

Background:

Periprosthetic joint infection (PJI) can be a devastating complication following shoulder arthroplasty. PJI following hip and knee arthroplasties has been found to increase mortality. However, anatomical and bacteriologic differences could potentially result in a different trend after shoulder arthroplasties. Thus, the purpose of the present study was to determine whether there is an association between shoulder PJI and all-cause mortality.

Methods:

Our institutional Total Joint Registry Database was queried to identify patients who underwent revision shoulder arthroplasty procedures between 2000 and 2018. A total of 1,160 procedures were then classified as either septic (21.8%) or aseptic (78.2%). Septic revisions were further subdivided into (1) debridement, antibiotics, irrigation, and implant retention (9.1%); (2) 2-stage reimplantation for deep infection (61.3%); (3) implant resection without reimplantation (3.6%); and (4) unexpected positive cultures at revision surgery (26.1%). The most common bacterium isolated was Cutibacterium acnes (64.4%). All-cause patient mortality was determined with use of our registry and confirmed with use of a nationwide mortality database. All-cause crude and adjusted mortality rates were then compared between groups.

Results:

The 1-year crude mortality rate was 1.8% (95% confidence interval [CI], 0.9% to 2.6%) for the aseptic group and 2.8% (95% CI, 0.7% to 4.8%) for the septic group (p = 0.31). Multivariate Cox regression analysis demonstrated an elevated but statistically similar adjusted hazard ratio for 1-year all-cause mortality of 1.9 (95% CI, 0.8 to 4.6) when comparing the septic to the aseptic group (p = 0.17). The risk of 2-year all-cause mortality was significantly higher in the septic group, with a hazard ratio of 2.2 (95% CI, 1.1 to 4.5; p = 0.029). In univariate analyses, increased 5-year mortality in the septic revision group was associated with age, Charlson Comorbidity Index, and methicillin-resistant Staphylococcus aureus infection, whereas C. acnes infection was associated with lower mortality.

Conclusions:

Shoulder PJI is associated with an adjusted 2-year all-cause mortality rate that is double that of aseptic patients. The results of the present study should be utilized to appropriately counsel patients who are considered to be at risk for infection following shoulder arthroplasty.

Level of Evidence:

Prognostic Level III. See Instructions for Authors for a complete description of levels of evidence.
Kolb's learning style analysis in solving HOTS questions for prospective physics teacher students
Authors: Nitriani Nengah , Darsikin Darsikin , Saehana Sahrul
Published: February 2022

This study aims to analyze Kolb's Learning Style (KLS) in solving HOTS questions for prospective physics teacher students. This research is a descriptive study using a qualitative approach. The subjects of this research are second semester students who have joined the Basic Physics course for Archimedes' Principle, amounting to 46 people. The instrument used was a Kolb's Learning Style (KLS) questionnaire, which consisted of 40 statement items, 8 essay questions about HOTS, and interview guidelines. Based on the results of the study, it showed that from the maximum percentage (100%) in each Kolb's Learning Style (KLS) obtained the combination of diverger and assimilator learning styles as the highest average percentage (65.63%) in solving HOTS questions correctly compared to the other learning styles. It is followed by the accomodator (56.25%), the combination of assimilator and converger (54.17%), diverger (53.41%), assimilator (49.22%), and converger (48.61%). There are differences in Kolb's Learning Style (KLS) in solving HOTS questions for prospective physics teacher students where students still experience errors in answering questions. The forms of incorrect answers given by students include: 1) Objects with a smaller surface area must be sink, 2) Heavy objects must be sink, 3) The amount of water affects the state of floating and sinking, 4) Hollow objects always float, and 5) Objects made of something hard must be sink. Based on the results of this study, it can be concluded that the ability of prospective physics teacher students in solving HOTS questions must be trained by adjusting their learning styles.
Analysis of student perceptions of problem-solving learning and peer assessment
Authors: Nesi Yustinus Maksimilianus Dhey , Kusairi Sentot , Nafisah Arrika Wifqotu Lailin
Published: February 2022

Problem solving is one of the mandatory skills for students in the 21st century, especially in physics subjects. This study aims to determine the students' ability to solve parabolic motion problems, to determine students' perceptions of learning in solving parabolic motion problems, to investigate the results of peer assessments carried out by students, and to determine students' perceptions of the implementation of peer assessment. This research method uses qualitative research procedures with a phenomenological approach. This research was conducted on 25 high school students in Ende district. The results of data analysis showed that the article met four indicators of problem-solving ability according to Polya, namely understanding the problem, planning a solution, solving the problem according to plan, and re-checking the evaluation results. The problem ability of students in this study was obtained with the results of 53.06 being included in the sufficient category. Future studies should give priority to providing instruction and training before giving peer assessment.
Improving high school students’ conceptual understanding of electricity and magnetism using scaffold analogy instructions
Authors: Mengistu Aysheshim , Assefa Shimels , Gebeyehu Desta
Published: February 2022

Simulated analogical teaching model has a novel contribution in enhancing students’ learning. This study aims to analyze effect of simulated analogies scaffold by group discussion model in improving students’ conceptual understanding of some selected contents of electricity and magnetism at high school level. The study involved 75 grade 10th students from two different high schools, namely Dagmawi Twodros and Fert high schools found in Debre Tabor Town, South Gondar, Amhara region, Ethiopia. A quasi-experimental method with pretest posttest design was used in the study. An adapted standardized test of electricity and magnetism conceptual understanding test (EMCUT) was used to collect data. The reliability of EMCUT was checked using KR-20 and found to be at about .81. After checking all necessary assumptions, an independent sample t-test was used to analyze the mean difference on students EMCUT scores between groups.  From the result analysis, we found that experimental group who used simulated analogies scaffold by group discussion method in learning of electricity and magnetism showed a higher mean score of EMCUT than the control group. Thus, it can be concluded that the use of simulated analogies scaffold by group discussion model improved high school students’ conceptual understanding of electricity and magnetism.
Use of a portable friction tester on snow and ice pavement
Authors: Menke Amelia , Shoop Sally , Elder Bruce
Published: February 2022

The objective of this project was to determine if portable friction testers could be used for friction measurements on compacted snow and ice surfaces. First, the effect of cold temperatures on the operation, consistency, and accuracy of commercially available portable pavement friction measuring tools was evaluated. Tests entailed a series of experiments in a controlled cold room environment. Two portable fixed slip continuous measurement devices and one deceleration spot measurement device were evaluated. The controlled temperature testing determined how ambient temperature and duration of exposure can affect results, but that with care, the devices could be operated in conditions as cold as ˗25°C. This was followed by using one of the devices on outdoor testing on snow, ice, and asphalt surfaces and compared the portable tester to the well-known SAAB vehicle runway friction tester. Results showed good agreement between the portable tester and the SAAB Friction tester, providing validation for the operational use of a portable tester on frozen surfaces.
Determination of the control point position for the estimation of the optimal cutoff time of closed-end furrow irrigation systems
Authors: Salahou Mohamed Khaled
Published: February 2022

Furrow irrigation systems are one of the dominant methods for growing cotton in the North China Plain and in other parts of the word. Many attempts have been made to improve furrow irrigation performance by selecting an optimal cut off time. The objective of this study is to determine the appropriate control point position for the estimation of the optimal cutoff time in a field situation with a closed-end furrow irrigation system. The experiments were conducted in a cotton field at the EcoAgricultural Experimental Station in Wuqiao, Hebei Province, North China Plain. Simulations employing two optimization strategies were used for determining the optimal cutoff time. These strategies were selected based on the irrigation system properties (total water applied depth and field characteristics), aiming to maximize application efficiency or requirement efficiency. The results show that the optimal cutoff time could be selected based on the relationship between the cutoff time and the advance time to a particular control point downstream. The position of this control point depends on the range of the inflow rate. The recommended control point position for estimating the optimal cutoff time was set at 0.9 of a furrow length for inflow rates less than 1.6 l/s and at 0.8 and 0.7 for inflow rates ranging between 1.6 and 2.0 l/s and 2.0 and 2.6 l/s, respectively. The results also show that to achieve a high irrigation performance when the inflow rate is high, it is better to reduce the requirements of irrigation and increase the number of irrigations. Determining the appropriate position of the control point helps to select the optimal cutoff time without requiring knowledge of the other irrigation system properties (i.e., soil water content, etc.). Keywords: Closed-end
Antenna Engineering for Various Applications with Low-Cost Product Manufacturing
Authors: M SURESH CHINNATHAMPY , Marzla Ancy
Published: February 2022

Antenna means for radiating radio waves, Generally the type of antenna that are used in cell phone handsets in the form of Sleeve dipoles, Whip antennas. In the sleeve dipoles we have a coaxial transmission line, dielectric insert, metal sleeve and line braid. The balancing mode can be achievable with metal sleeve also the stability of the radiation pattern. The role of the dielectric and sleeve are not only maintaining the radiation pattern stable but also walk on the matching. Whenever we have the roll over mobile it is used for getting signal as well as receive signal. Capturing of signal is possible when the mobile starts working. The system represents the capturing of omni directional signal through radiation pattern measurements. The coaxial line inner conductor is along the Z- direction, the signal is symmetric along X-Y plane.
In this chapter it is proposed to develop an antenna which can be used as low-cost product in various fields. The construction of the whip antenna must be compact. A spring in the whip antenna plays a vital role as small compact antenna systems which is usually implemented for cell phones. The small compact antenna used for transmitting and receiving signals in an omni-directional system. From the cell phone perspective technology, the printed technology made a significant role which helps in use meandered monopoles used in MEMS. In historical perspective, this complicated design has to concentrate on the types of frequency ranges covered with radiation pattern also we cannot estimate current in the antenna since it is an integrated device, the placement of the other things like a battery also carries power and we have to look into the arrangements in a design in such a way that we must estimate the power dissipation throughout the antenna circuit, we have to rectify if the current which flows through the conductor carries any additional effects. The overall structure of the mobile also affects the radiation pattern. The parasitic effects, nearby circuits, placement of the other devices in a mobile affects the electromagnetic energy distribution. Similarly in all the fields the antenna can be developed with low-cost product manufacturing.
Micro-Line Investigation in Titanium Dioxide Thin Film Coated on TiNi Alloy by Indirect Microscopy
Authors: Yadav Nagendra Prasad , Hu Guozhen , Xu Bin
Published: February 2022

Titanium Dioxide thin film was synthesized on Titanium Nickelide alloy by using sol-gel spin coating method. Nowadays, it is a big issue to investigate the micro crack line in any thin film through the optical microscope for character the adhesion. The super-resolution microscope is better for evaluating the adhesion. The surface morphology of the film was studied using Scanning Electron Microscopy (SEM). Recently, only expensive and inconvenient non-optical method such as SEM (Scanning Electron Microscope) and TEM (Transmission Electron Microscope) are available for high resolution services. Here, we are reporting on the investigations of the crack line in titanium dioxide thin film coated on titanium nickelide alloy by Superresolution Parameter Indirect Microscopy Imaging. Furthermore, we found that the crack line can be seen in PIMI images whereas in SEM the crack line not seen clearly even the magnification of SEM is 10000X, which have been demonstrated by comparing the line intensity across the crack.
Impact of klotho on the expression of SRGAP2a in podocytes in diabetic nephropathy
Authors: Jin Donghua , Jia Miao , Xie Yuxian , Lin Lihua , Qiu Hong , Lu Guoyuan
Published: February 2022

Background Diabetic nephropathy (DN) is the major cause of renal failure, and glomerular podocytes play critical roles in the pathogenesis of DN by maintaining the glomerular structure and filtration barrier. Klotho and Slit-Robo GTP activating protein 2a (SRGAP2a) have been indicated to play protective roles in reducing renal injury, but whether there is an internal relationship between these two factors is unclear. Methods In this study, we cultured differentiated rat podocytes in vitro and measured the SRGAP2a expressions by immunofluorescence staining, quantitative real-time PCR (qRT-PCR) and western blotting, after siRNA-mediated transforming growth factor β1 (TGF-β1) silencing, TGF-β1 overexpression and in the presence of a reactive oxygen species (ROS) inhibitor. And we detected the expressions of SRGAP2a, small mother against decapentaplegic (Smad)2/3, phosphorylated-Smad2/3 (p-Smad2/3), Smad7, and NAD(P)H oxidase 4 (NOX4), ROS levels and podocyte cytoskeletal remodelling under high glucose (HG) and exogenous klotho conditions. In addition, we performed haematoxylin-eosin (HE) staining and immunohistochemistry with diabetic rat models to confirm the in vitro results. Results The results indicated that SRGAP2a expression was significantly upregulated under siRNA-mediated TGF-β1 silencing conditions or after adding a ROS inhibitor, but significantly downregulated with TGF-β1 overexpression, in the presence of HG. The supplementation of exogenous klotho under HG conditions significantly increased the SRGAP2a expression, remodelled the actin cytoskeleton and altered the expressions of Smad2/3, p-Smad2/3, Smad7 and NOX4 and reduced the ROS generation in podocytes. Moreover, klotho administration protected renal injury in DN rats. Conclusions This study indicated that klotho may modulate the expression of SRGAP2a by regulating the ROS and TGF-β1 signalling pathways and provided theoretical support for klotho protein as a novel therapeutic strategy for treating DN patients.
Fuzzy Win-Win: A Novel Approach to Quantify Win-Win Using Fuzzy Logic
Authors: Hassanat Ahmad B. , Altarawneh Ghada A. , Tarawneh Ahmad S. , Carfi David , Almuhaimeed Abdullah
Published: February 2022

The classic win-win has a key flaw in that it cannot offer the parties with right amounts of winning because each party believes they are winners. In reality, one party may win more than the other. This strategy is not limited to a single product or negotiation; it may be applied to a variety of situations in life. We present a novel way to measure the win-win situation in this paper. The proposed method employs Fuzzy logic to create a mathematical model that aids negotiators in quantifying their winning percentages. The model is put to the test on real-life negotiation scenarios such as the Iraqi-Jordanian oil deal, and the iron ore negotiation (2005-2009). The presented model has shown to be a useful tool in practice and can be easily generalized to be utilized in other domains as well.