bluuebunny/crossref_metadata_2025 huggingface dataset:
Decade-long Ozone Profile Record from Suomi NPP OMPS Limb Profiler: Assessment of Version 2.6 Data
Authors: Kramarova Natalya A , Xu Philippe , Mok Jungbin , Bhartia Pawan , Jaross Glen , Moy Leslie , Chen Zhong , Frith Stacey M , DeLand Matthew Todd , Kahn Daniel , Labow Gordon Jay , Li Jason , Nyaku Ernest , Weaver Clark , Ziemke Jerald R. , Davis Sean M. , Jia Yue
Published: April 2024

We evaluate a decadal ozone profile record derived from the Suomi
National Polar-orbiting Partnership (SNPP) Ozone Mapping and Profiler
Suite (OMPS) Limb Profiler (LP) satellite instrument. In 2023, the OMPS
LP data were re-processed with the new version 2.6 retrieval algorithm
that combines measurements from the ultraviolet (UV) and visible (VIS)
parts of the spectra and employs the second order Tikhonov
regularization to retrieve a single vertical ozone profile between 12.5
km (or cloud tops) and 57.5 km with the vertical resolution of about 1.9
- 2.5 km between 20-55 km. The algorithm uses radiances measured at six
UV ozone-sensitive wavelengths (295, 302, 306, 312, 317 and 322 nm)
paired with 353 nm, and one VIS wavelength at 606 nm combined with 510
nm and 675 nm to form a triplet. Each wavelength pair or triplet is used
over a limited range of tangent altitudes where the sensitivity to ozone
changes are strongest. A new implemented aerosol correction scheme is
based on a gamma-function particle size distribution. Numerous
calibration changes that affected ozone retrievals were also applied to
measured LP radiances, including updates in altitude registration,
radiometric calibration, stray light, and spectral registration. The key
version 2.6 improvement is the reduction in relative drifts between LP
ozone and correlative measurements, linked previously to a drift in the
version 2.5 LP altitude registration. We compare LP ozone profiles with
those from Aura Microwave Limb Sensor (MLS) to quantify ozone changes in
version 2.6.
Construction of Temperature Climate Data Records in the Upper Troposphere and Lower Stratosphere Using Multiple RO Missions from 2006 to 2023 at NESDIS/STAR
Authors: Zhou Jun , Ho Shu-Peng , Zhou Xinjia , Shao Xi , Gu Guojun , Chen Yong , Jing Xin
Published: April 2024

We develop a new gridded monthly mean climatology (MMC) in the upper
troposphere and lower stratosphere (UTLS) from 2006 to 2023 using the
dry temperature profiles from multiple Global Navigation Satellite
System (GNSS) Radio Occultation (RO) missions processed by the GNSS RO
Science and Data Center (SDC) at the NOAA Center for Satellite
Applications and Research (STAR). The multiple RO missions include
Formosa Satellite Mission 3/Constellation Observing System for
Meteorology, Ionosphere, and Climate (COSMIC-1), Formosa Satellite
Mission 7/ COSMIC-2, SPIRE, and Meteorological Operational satellite
(MetOp)-A, -B, -C. The sampling error in MMC is corrected by using ERA-5
reanalysis. The robustness of the sampling error correction method is
validated through three different reanalysis models. The result shows
that the mission difference in MMC is significantly reduced after
sampling error correction, and the uncertainty caused by using different
models in the correction method can be neglected. This STAR MMC is then
compared with the ROM SAF MMC and the MMC derived from ERA-5, MERRA-2,
and JRA-55 reanalyses, exhibiting good agreement. Various climate
signals, such as Quasi-Biennial Oscillation (QBO) and El Niño–Southern
Oscillation (ENSO), can be identified from STAR MMC. The global
temperature trends present a transition from a prominent warming of
0.309 ± 0.085 K/Decade in the upper troposphere to a robust cooling of
-0.281 ± 0.044 K/Decade in the mid-stratosphere, consistent with the
well-known response of the UTLS region to long-term global warming.
These results demonstrate that STAR MMC can capture climate signals and
monitor long-term climate change.
Volumetric reconstruction of ionospheric electric currents from tri-static incoherent scatter radar measurements
Authors: Reistad Jone Peter , Hatch Spencer Mark , Laundal Karl M. , Oksavik Kjellmar , Zettergren Matthew David , Vanhamäki Heikki , Virtanen Ilkka I.
Published: April 2024

We present a new technique for the upcoming tri-static incoherent
scatter radar system EISCAT 3D (E3D) to perform a volumetric
reconstruction of the 3D ionospheric electric current density vector
field, focusing on the feasibility of the E3D system. The input to our
volumetric reconstruction technique are estimates of the 3D current
density perpendicular to the main magnetic field,
$\mathbf{j}_\perp$, and its
co-variance, to be obtained from E3D observations based on two main
assumptions: 1) Ions fully magnetised above the $E$ region, set to 200
km here. 2) Electrons fully magnetised above the base of our domain, set
to 90 km. In this way,
$\mathbf{j}_\perp$ estimates are
obtained without assumptions about the neutral wind field, allowing it
to be subsequently determined. The volumetric reconstruction of the full
3D current density is implemented as vertically coupled horizontal
layers represented by Spherical Elementary Current Systems with a
built-in current continuity constraint. We demonstrate that our
technique is able to retrieve the three dimensional nature of the
currents in our idealised setup, taken from a simulation of an active
auroral ionosphere using the Geospace Environment Model of Ion-Neutral
Interactions (GEMINI). The vertical current is typically less
constrained than the horizontal, but we outline strategies for
improvement by utilising additional data sources in the inversion. The
ability to reconstruct the neutral wind field perpendicular to the
magnetic field in the $E$ region is demonstrated to mostly be within
$\pm 50$ m/s in a limited region above the radar system
in our setup.
Plasma Structure Decay Rates in the Equatorial Ionosphere are Strongly Coupled by Turbulence
Authors: Ivarsen Magnus Fagernes , Maurice Jean-Pierre St.- , Park Jaeheung , Klenzing Jeffrey , Jin Yaqi , Lee Woo Kyoung
Published: April 2024

Equatorial plasma irregularities in the ionospheric F-region proliferate
after sunset, causing the most apparent radio scintillation “hot-spot”
in geospace. These irregularities are caused by plasma instabilities,
and appear mostly in the form of under-densities that rise up from the
F-region’s bottomside. After an irregularity production peak at sunset,
the amplitude of the resulting turbulence decays with time. Analyzing a
large database of plasma irregularity spectra observed by one of the
European Space Agency’s Swarm satellites, we have applied a novel but
conceptually simple statistical analysis to the data, finding in the
process that post-sunset turbulence in the F-region tends to decay with
a uniform, scale-independent rate at night, thereby confirming and
extending the results from earlier case studies. Our results should be
of utility for large-scale space weather modelling efforts that are
unable to resolve turbulent effects.
Flat slab-induced hydration weakening and destruction of the North China Craton
Authors: Paul Jyotirmoy , Spang Arne , Piccolo Andrea
Published: April 2024

In this study, we develop two dimensional (2-D) box models to identify
the most viable reasons for the destruction of the North China Craton
(NCC). We examine the role of flat slab-induced hydration, high-density
lower crust, and weak mid-lithospheric discontinuity in our models.
Results indicate that flat slab-induced hydration weakening of the
eastern part of the NCC can lead to rapid craton destruction if
hydration weakening rates are sufficiently fast. This accelerated
hydration rate may be attributed to the extensive carbonatite magmatism
within the eastern part of the NCC, facilitating a faster pathway for
water diffusion throughout the craton. Craton destruction is contingent
upon the craton’s density exceeding the surrounding mantle density, and
its viscosity decreasing below 1022 Pa s. We observe that the presence
of a dense lower crust or a weak mid-lithospheric discontinuity fail to
destroy the NCC unless it is weakened.
Seismic Magnitudes Entropy and b-value
Authors: Nava-Pichardo Fidencio Alejandro
Published: April 2024

How seismic magnitudes are distributed is important for estimating
stress levels in seismic hazard studies, and two methods of
characterizing the magnitude distribution are through the
Gutenberg-Richter b-value, or equivalently through , and through the
information entropy. A closed relationship between the b-value and the
entropy (applicable to any exponential distribution and its entropy) is
presented and is checked through numerical evaluation of the entropy
using exact probabilities derived directly from the magnitude
exponential distribution. Since the numerical evaluation of the entropy
is done over a finite magnitude range, it is possible to assess the
possible contribution to the entropy of real or hypothetical very large
magnitudes, and these contributions are found to be quite small. The
relationship is also compared with entropies calculated from synthetic
data, and Monte Carlo simulations are used to explore the behavior of
entropy determinations as a function of sample size. Finally, it is
considered how, for the usual case of having data from a single
realization, in spite of the relation between them, because entropy and
Aki-Utsu b-value are measured in different ways, both measures are not
redundant and may be complementary and useful in determining when a
sample is large enough to give reliable results.
Gaussian process regression-based Bayesian optimisation (G-BO) of model parameters - a WRF model case study of southeast Australia heat extremes
Authors: Reddy P. Jyoteeshkumar , Chinta Sandeep , Baki Harish , Matear Richard J. , Taylor John
Published: April 2024

In Numerical Weather Prediction (NWP) models, such as the Weather
Research and Forecasting (WRF) model, parameter uncertainty in physics
parameterization schemes significantly impacts model output. Our study
adopts a Bayesian probabilistic approach, building on prior research
that identified temperature (T) and relative humidity (Rh) as sensitive
to three key WRF parameters during southeast Australia’s extreme heat
events. Using Gaussian process regression-based Bayesian Optimisation
(G-BO), we accurately estimated the optimal distributions for these
parameters. Results show that the default values are outside their
corresponding optimal distribution bounds for two of the three
parameters, suggesting the need to reconsider these default values.
Additionally, the robustness of the optimal parameter distributions is
validated by their application to an independent extreme heat event, not
included in the optimisation process. In this test, the optimised
parameters substantially improved the simulation of T and Rh,
highlighting their effectiveness in enhancing simulation accuracy during
extreme heat conditions.
Acceptance Factors Affecting the Intention to Use Mobile Payments: QR Code Applications
Authors: Sehat Nani Shuhada , Daud Siti Rohana , Ahmad Khaizie Sazimah , Suhaime Intan Liana , Jogeran Jumaelya
Published: April 2024

This study explores the intentional use of QR code applications in Malaysia through the lens of the Unified Theory of Acceptance and Use of Technology 2 (UTAUT 2), focusing on five key constructs: which is performance expectancy (PE), effort expectancy (EE), hedonic motivation (HM), habit (H), and trust (TR). An online survey was constructed and disseminated to a random sample of 215 respondents located in the Southeast region. The primary objective of this survey was to collect data regarding their intentions to utilize QR code applications. The collected data were analyzed using the Statistical Package for the Social Sciences (SPSS), aiming to understand the relationship between the UTAUT 2 factors and behavioral intention towards QR code usage. The analysis revealed that all the UTAUT 2 factors which are performance expectancy, effort expectancy, hedonic motivation, habit, and trust have a positive significant relationship with the behavioral intention to use QR codes application. Among these, trust emerged as the most influential factor, underscoring its critical role in the adoption of QR code technology. This finding highlights the importance of addressing security and privacy concerns to foster trust among users, which is pivotal for the wider acceptance and use of QR codes in Malaysia. The study provides valuable insights for developers, marketers, and policymakers looking to enhance the adoption of QR code technology, emphasizing the need to build a trustworthy and user-friendly QR code ecosystem.
Type 1 Diabetes Genetic Risk in 109,954 Veterans with Adult-Onset Diabetes: The Million VeteranProgram (MVP)
Authors: K Yang Peter , L Jackson Sandra , R Charest Brian , J Cheng Yiling , V Sun Yan , Raghavan Sridharan , M Litkowski Elizabeth , T Legvold Brian , K Rhee Mary , A Oram Richard , V Kuklina Elena , Vujkovic Marijana , D Reaven Peter , Cho Kelly , Leong Aaron , W F Wilson Peter , Zhou Jin , R Miller Donald , Sharp Seth A , R Staimez Lisa , E North Kari , M Highland Heather , S Phillips Lawrence
Published: April 2024

Objective: To characterize high type 1 diabetes (T1D) genetic risk in a population where type 2 diabetes (T2D) predominates.

Research Design and Methods: Characteristics typically associated with T1D were assessed in 109,594 Million Veteran Program (MVP) participants with adult-onset diabetes 2011–2021, who had T1D genetic risk scores (GRS) defined as low (0-<45%), medium (45-<90%), high (90-<95%), or highest (≥95%).

Results: T1D characteristics increased progressively with higher genetic risk (p<0.001 for trend). A GRS ≥90% was more common with diabetes diagnoses before age 40 years, but 95% of those participants were diagnosed at age ≥40 years, and they resembled T2D in mean age (64.3 years) and BMI (32.3 kg/m2). Compared to the low risk group, the highest risk group was more likely to have diabetic ketoacidosis (DKA) (low 0.9% vs. highest GRS 3.7%), hypoglycemia prompting emergency visits (3.7% vs. 5.8%), outpatient plasma glucose <50 mg/dL (7.5% vs. 13.4%), a shorter median time to start insulin (3.5 vs. 1.4 years), use of a T1D diagnostic code (16.3% vs. 28.1%), low C peptide levels if tested (1.8% vs. 32.4%), and glutamic acid decarboxylase (GAD) antibodies (6.9% vs. 45.2%), all p<0.001.

Conclusions: Characteristics associated with T1D were increased with higher genetic risk, and especially with the top 10% of risk. However, the age and BMI of those participants resemble T2D, and a substantial proportion did not have diagnostic testing or use of T1D diagnostic codes. T1D genetic screening could be used to aid identification of adult-onset T1D in settings in which T2D predominates
The Early Pathogenesis of Diabetic Retinopathy and Its Attenuation by Sodium-Glucose Transporter 2 Inhibitors
Authors: Yamato Mayumi , Kato Nao , Yamada Ken-ichi , Inoguchi Toyoshi
Published: April 2024

The early pathogenetic mechanism of diabetic retinopathy (DR) and its treatment remain unclear. Therefore, we investigated the early pathogenic alterations in DR using streptozotocin-induced diabetic mice and the protective effect of sodium-glucose cotransporter 2 (SGLT2) inhibitors against these alterations. Retinal vascular leakage was assessed by dextran fluorescence angiography. Retinal thickness and vascular leakage were increased 2 and 4 weeks after onset of diabetes, respectively. Immunostaining showed that morphological change of microglia (amoeboid form) was observed at 2 weeks. Subsequently, increased angiopoietin-2 expression, simultaneous loss of pericytes and endothelial cells, decreased vessel density, retinal hypoxia, and increased vascular endothelial growth factor (VEGF)-A/VEGF receptor system occurred at 4 weeks. SGLT2 inhibitors (luseogliflozin and ipragliflozin) had a significant protective effect on retinal vascular leakage and retinal thickness at a low dose that did not show glucose-lowering effects. Furthermore, both inhibitors at this dose attenuated microglia morphological changes and these early pathogenic alterations in DR. In vitro study, both inhibitors attenuated the lipopolysaccharide-induced activation of primary microglia, along with morphological changes toward an inactive form, suggesting the direct inhibitory effect of SGLT2 inhibitors on microglia. In summary, SGLT2i may directly prevent early pathogenic mechanisms, thereby potentially playing a role in preventing DR.
Akibat Hukum Wanpretasi Perspektif Komplikasi Hukum Ekonomi Syariah (KHES) dan Kitab Undang- Undang Hukum Perdata
Authors: Fahmi Hibatullah Muhammad
Published: April 2024

Sources of law in Indonesia can be found in the Burgelijk Wetbook (BW) in book III and in the Complications of Sharia Economic Law (KHES) in Indonesia. There is a practice where people in Indonesia have two alternatives in resolving problems in legal incidents (defaults). Communities with religions other than Islam use laws taken from the Civil Code as a basis, while some Muslim communities use the Civil Code or use KHES as a reference in proceedings. Of the many legal activities, there are legal events that are caused by legal subjects which cause one of the legal subjects to experience errors or violations in a legal event. In this article, we will discuss the consequences of default practices, especially in the case of economic engagements. The method used is the normative method with comparative analysis. The result of the discussion is that an agreement is an event where two legal subjects, namely the debtor and the creditor, promise each other to do something or a contract that must fulfill each other's rights and obligations. If one of the legal subjects does not carry out the obligations they mutually agreed upon, then one of them has broken a promise. Broken Promise here is a situation where the debtor does not carry out or fulfill the achievements or obligations of an agreement. The conclusion that the researchers found was the difference in the mention of the term agreement in the Complications of Sharia Economic Law (KHES) and the Indonesian Civil Code (KUHPer). The condition for the validity of an agreement is that legal subjects must be legally competent, the Civil Code states that legal subjects must be 21 years old while KHES legal subjects are 18 years old. The sanctions given by KHES are compensation experienced by creditors, while the KUHPer sanctions given are costs, losses and interest.
Pembelian Lahan Virtual pada Platform Metaverse Menggunakan Mata Uang Kripto Perspektif Hukum Islam
Authors: Ulfita Rifka Asri
Published: April 2024

Virtual land in the metaverse can be understood as the area being traded to investors. The area is a clone of the original area in the real world. Through this platform, one can virtually have an office, workspace and other functions. In this virtual world, the developer has provided many options and other supporting features. Virtual land purchase transactions are projected to use cryptocurrencies. Therefore, this study answers two paradigms that intersect with one another. On the one hand, virtual land purchases still reap various polemics in Islamic law. On the other hand, the use and investment of cryptocurrencies are also still experiencing various upheavals in the legal implementation. This study concludes that the practice of investing in buying virtual land on the metaverse platform is permissible with the terms and conditions: having sufficient knowledge about virtual investment and having sufficient experience in non-physical businesses in order to survive and generate profits.
Penyelesaian Sengketa Kredit Macet pada BMT El Ummu Rahimah Kabupaten Sijunjung Sumatera Barat
Authors: Arnes Okto viandra arnes , Arianti Farida
Published: April 2024

Baitul Maal wa Tamwil (BMT) is one of the financial institutions engaged in financial services based on sharia principles in carrying out its activities. However, Baitul maal wa tamwil is not uncommon or frequent bad credit disputes committed by customers intentionally or unintentionally. This research is quantitative research, namely field research by exploring data sourced from BMT El Ummu Rahimah Sijunjung Regency, West Sumatra regarding dispute resolution in Baitul Maal Wa Tamwil. The data collected uses field research (Field Research), namely collecting data through interviews, observations and other materials. In resolving bad credit disputes at Baitul maal wa tamwil, there are alternative solutions that must be taken by customers, namely through litigation (in court) and non-litigation (out of court). However, the settlement of bad credit disputes at BMT El Ummu Rahimah is resolved in a non-litigation manner, namely dispute resolution outside the court. There are several steps taken by BMT El Ummu Rahimah in resolving bad credit disputes, namely giving warning letters, providing relief and the existence of settlements made amicably in the event of bad credit by customers. But what is no less important is that BMT El Ummu Rahimah is unable to return the customer's money. So that BMT El Ummu Rahimah was audited and all of its goods were confiscated.
Решение регрессионной задачи машинного обучения на основе теории случайных функций
Authors: Бахвалов Юрий
Published: April 2024

В статье исследуется регрессионная задача машинного обучения как задача многомерной аппроксимации с использованием математического аппарата теории случайных функций. Показано, что если допустить существование в бесконечномерном функциональном пространстве некоторых симметрий плотности вероятности, то этого достаточно, чтобы получить точный метод решения задачи.
TINGKAT KEBERLANJUTAN PENGGUNAAN SUMBER BELAJAR DIGITAL OLEH GURU GEOGRAFI PADA MATERI SIG
Authors: Yulianto Dedi , Widyatmoko Wahyu
Published: April 2024

Penelitian ini dilakukan dengan tujuan: (1) menganalisis tingkat pengetahuan guru geografi SMA mengenai sumber belajar digital pada pembelajaran sistem informasi geografis di Kabupaten Klaten. (2) menganalisis tingkat pemanfaatan sumber belajar digital pada pembelajaran sistem informasi geografis oleh guru geografi SMA di Kabupaten Klaten. (3) menganalisis tingkat keberlanjutan pemanfaatan sumber belajar digital pada pembelajaran sistem informasi geografis oleh guru geografi SMA di Kabupaten Klaten. Jenis penelitian ini adalah penelitian kuantitatif dan teknik analisis data menggunakan statistik deskriptif. Populasi dalam penelitian ini adalah guru geografi pada jenjang SMA di Kabupaten Klaten yang berjumlah 46 responden dengan teknik sampling adalah sampel jenuh. Teknik pengumpulan data yang digunakan berupa kuesioner. Hasil penelitian menunjukan bahwa (1) tingkat pengetahuan guru geografi SMA mengenai sumber belajar digital pada pembelajaran sistem informasi geografis di Kabupaten Klaten berada pada kategori sedang dengan skor 6,67. (2) tingkat pemanfaatan sumber belajar digital pada pembelajaran sistem informasi geografis oleh guru geografi SMA di Kabupaten Klaten berada pada kategori rendah dengan skor 29.87. (3) tingkat keberlanjutan pemanfaatan sumber belajar digital pada pembelajaran sistem informasi geografis oleh guru geografi SMA di Kabupaten Klaten berada pada kategori sedang dengan nilai 54,17.
PENGARUH PELATIHAN PROGRAM CIVIC EDUCATION LEADERSHIP TERHADAP AKTUALISASI NILAI-NILAI KEPEMIMPINAN MAHASISWA PPKn FKIP UNIVERSITAS RIAU
Authors: Putra Febrianto Budiman , , Hambali , Primahardani Indra
Published: April 2024

Penelitian ini dilatarbelakangi oleh fenomena sikap apatis dikalangan mahasiswa yang secara nyata menggerus karakter kepemimpinan mahasiswa sebagai Iron Stock atau aset tangguh yang akan melanjutkan estafet kepemimpinan pada masa yang akan datang. Penelitian ini bertujuan untuk mengetahui apakah ada pengaruh pelatihan program Civic Education Leadership (CEL) terhadap aktualisasi nilai-nilai kepemimpinan mahasiswa Program studi PPKn FKIP Universitas Riau. Penelitian ini menggunakan metode penelitian kuantitatif dengan pendekatan asosiatif kausal. Penelitian ini dilakukan di program studi PPKn FKIP Universitas Riau, dengan metode pengumpulan data menggunakan angket dan analisis data statistik IBM SPSS Version 25. Berdasarkan hasil analisis data, uji hipotesis diperoleh nilai  (11,23) ≥  (1,65), dimana hal tersebut menunjukkan hipotesis dalam penelitian ini diterima. Selanjutnya diperoleh nilai koefisien determinasi sebesar 0,43. berdasarkan hasil tersebut maka dapat disimpulkan pengaruh pelatihan CEL terhadap aktualisasi nilai kepemimpinan mahasiswa PPKn FKIP Universitas Riau sebesar 43% berada pada tingkat ”Sedang”.
EFEKTIVITAS PEMBELAJARAN SISTEM BLOK SELAMA MATRIKULASI TERHADAP TINGKAT PENGETAHUAN MAHASISWA KEDOKTERAN UNIVERSITAS TANJUNGPURA
Authors: Rahmayanti Sari , Astuti Puji
Published: April 2024

Sistem blok merupakan metode pembelajaran student-centered yang telah banyak diterapkan di institusi pendidikan Kesehatan di Indonesia. Banyak mahasiswa baru mengalami kesulitan dalam beradaptasi dengan situasi pembelajaran mereka, dimana sebelumnya metode pembelajaran mereka adalah teacher-centered dan kini berubah menjadi student-centered. Matrikulasi merupakan program penyesuaian yang diselenggarakan oleh perguruan tinggi dengan tujuan untuk mempercepat kemampuan adaptasi akademik maupun non-akademik mahasiswa baru di perguruan tinggi. Penelitian ini bertujuan untuk mengetahui efektivitas pembelajaran sistem blok selama matrikulasi terhadap tingkat pengetahuan mahasiswa Program Studi S1 Kedokteran Universitas Tanjungpura. Penelitian ini merupakan penelitian kuantitatif menggunakan metode eksperimen dengan jenis penelitian berupa quasi experimental. Rancangan yang digunakan pada penelitian ini merupakan one group pre-test post-test design. Teknik pengumpulan data dilakukan dengan menggunakan kuisioner. Sampel diambil dengan metode total sampling yaitu sebanyak 78 mahasiswa. Hasil penelitian menunjukkan persiapan belajar yang dilakukan oleh mahasiswa dalam menghadapi post-test tidak berdampak signifikan terhadap kelulusan mereka berdasarkan standar nilai yang digunakan di jurusan kedokteran (α = 0.233). Kegiatan matrikulasi terbukti secara signifikan meningkatkan pengetahuan peserta, namun tidak cukup baik untuk mendapatkan predikat lulus berdasarkan sistem penilaian.
INOVASI PEMBELAJARAN: MEMPERKUAT KEMAMPUAN MENULIS ILMIAH MAHASISWA MELALUI PENUGASAN PUBLIKASI ARTIKEL ILMIAH
Authors: Marampa Elieser R , Pangaribuan Allen , Siregar Johanes Parulian , Siburian Agustina , Zai Suardin
Published: April 2024

Salah satu aspek penting dalam pembelajaran yang dilaksanakan pada perguruan tinggi adalah meningkatkan kemampuan menulis ilmiah mahasiswa. Menulis ilmiah merupakan suatu kegiatan yang memerlukan keterampilan khusus dan membutuhkan pemahaman yang mendalam terhadap suatu topik. Namun, masih banyak mahasiswa yang mengalami kesulitan dalam menulis artikel ilmiah yang berkualitas. Oleh karena itu, dibutuhkan inovasi pembelajaran yang dapat meningkatkan kemampuan menulis ilmiah mahasiswa. Tujuan penelitian ini adalah untuk mengembangkan sebuah inovasi pembelajaran yang dapat meningkatkan kemampuan menulis ilmiah mahasiswa melalui penugasan publikasi artikel ilmiah. Metode yang digunakan dalam penelitian ini adalah metode penelitian tindakan kelas yang dilakukan dalam tiga siklus. Setiap siklus terdiri dari perencanaan, pelaksanaan, observasi, dan refleksi. Adapun hasil riset menunjukkan bahwa implementasi metode penugasan publikasi artikel ilmiah memiliki korelasi yang signifikan dalam meningkatkan minat belajar dan kemampuan mahasiswa dalam menulis artikel ilmiah serta membuahkan produktivitas pembelajaran yang lebih optimal.
El tratado De vita contemplativa: la vida teórica (βίος θεωρητικός), según Filón de Alejandría
Authors: Cardoso Bueno Diego Andrés
Published: April 2024

La cuestión, tan cara al mundo grecorromano, de las formas de vida es desarrollada por Filón de Alejandría en diversos tratados, en los que se acerca y define la distinta tipología en la que el hombre puede afrontar la existencia de diferentes modos. Uno de ellos, quizá el más excelso para muchas escuelas filosóficas, fue el concepto de vida teórica o contemplativa, que es examinado por este filósofo judío de un modo especial en su obra De vita contemplativa, donde para analizarlo se sirve del caso de una singular comunidad de sabios ascetas, los therapeutae, que conviven en un curioso poblado disperso a la afueras de Alejandría, junto al lago Mareotis.
¿Rumbo a un comercio franquiciado? El rol de las marcas y sus formatos productivos en Argentina
Authors: Mux Damián
Published: April 2024

Las franquicias se posicionan cada vez mejor en la gestión de las relaciones comerciales en nuestro país. ¿Qué características presentan las marcas en nuestro país? ¿Qué factores incidieron en el crecimiento de este modelo entre 2015-2023? ¿Qué posibles efectos tiene la expansión del franchising en las condiciones de empleo? Recopilando datos de cámaras sectoriales y a través de un relevamiento territorial de establecimientos comerciales en tres ciudades clave del país acompañado de una serie de entrevistas semi estructuradas a trabajadores del sector, proponemos presentar rasgos básicos de las franquicias en Argentina desde la sociología laboral. En esa línea, se destaca la proliferación de “Mc Jobs”, de formatos mínimos de comercialización que priorizan la economía de escala y la presencia territorial por encima de las condiciones de empleo. Por último, planteamos algunos interrogantes y premisas para futuras indagaciones sobre un fenómeno de creciente relevancia en el comercio minorista.
Metodologías deconstructivas y horizontales para el diseño. Un enfoque desde las ciencias sociales
Authors: Trejo Poo Alejandra
Published: April 2024

El ámbito de la metodología de la investigación es parte medular de todo proyecto que busque generar conocimiento y transformación. Desde este último aspecto, es importante tomar en cuenta no sólo la metodología tradicional que ciertamente debe estar presente en todo tipo de trabajo, sino también aquella que incite la deconstrucción de parámetros y relaciones durante el acercamiento a un tema. Precisamente, nos referimos a aspectos como la colaboración y el diálogo con el otro, con quien estamos conociendo un nuevo mundo a partir de otras nociones, y así plantear nuevas formas epistemológicas desde múltiples interpretaciones más allá de las del investigador. A su vez, se propone una deconstrucción al momento de generar conocimiento a través de un acercamiento distinguido hacia un contexto particular, por ejemplo, cuestionar lo obvio, lo aparente, plantearse lo no dicho, o irse por los márgenes del propio proyecto de investigación. De esta manera, no sólo se encontrarán nuevos aspectos a considerar, sino también nuevas formas para construir y diseñar metodológicamente una perspectiva hacia un área del cual logramos abrir nuevos sentires y significados al momento de plantear un proyecto, así como visualizar propuestas de diseño con él y su campo.
Diseño y desarrollo de elementos lúdicos para apoyar a niñas y niños de 6 a 8 años que padecen de ansiedad en la CDMX
Authors: Buyoli Saavedra Alma Karla
Published: April 2024

Esta investigación surgió del interés por aportar desde el área de diseño un sistema que pudiera ayudar al control de los síntomas de las mujeres con ansiedad. Esto debido a que las mujeres tienen 3 veces mayor posibilidad de generar ansiedad que los hombres. Sin embargo, en el trayecto de la investigación se identificaron nuevas necesidades que cambiaron su rumbo. Esta transición se seleccionó después de un arduo análisis de la información obtenida previamente,considerando que este nuevo enfoque tiene una mayor aportación. Es así como se planteó una investigación sobre el desarrollo de elementos lúdicos que apoyan a las niñas y niños con ansiedad.
Procesos metodológicos contemporáneos centrados en el usuario
Authors: Rodríguez Mondragón Sandra
Published: April 2024

La presente investigación tiene la intención de describir, algunos procesos de metodología contemporánea de diseño centrado en el usuario. Como parte inicial, se abordan las definiciones de conceptos tales como proceso, método, metodología y contemporáneo; posteriormente se realiza una exploración del concepto de diseño centrado en el usuario (DCU) y de los métodos de diseño centrado en el usuario. Finalmente se ejemplifica, cómo emplear la metodología para el desarrollo de productos, basándose en los métodos de diseño centrado en el usuario, la idea no es hacer un análisis exhaustivo de todos los métodos, pero sí indicar algunos de ellos, así como recomendaciones genéricas para cada paso del proceso del diseño centrado en usuarios puesto que son útiles para entender y especificar el contexto de uso en proyectos de diseño.
Síntesis y caracterización de nanopartículas de Pt y Au@Pt con planos preferenciales para la reacción de oxidación de metanol
Authors:   , Roque de la O Noemi
Published: April 2024

The purpose of this work is to study the catalytic behavior of Pt nanoparticles (NPs) with different surface orientations since the MOR is sensitive to the nanoparticle’s surface plane. To perform this surface modification, the polyol method is used, and silver nitrate (AgNO3) is incorporated to modify the morphology of the nanoparticles. Furthermore, to reduce the amount of Pt used, core-shell nanoparticles were also synthesized, where in the core of the nanoparticle there is a different material, in this case gold (Au), and platinum is deposited in the shell. It should be noted that in this work the aim was to modify the surface planes present in the Pt shell. The above-mentioned catalysts were supported on Carbon Vulcan XC-72R for evaluation of the methanol oxidation reaction, the catalysts obtained were the following Pt 1/C, Pt 2/C, Au@Pt 1/C and Au@Pt 2/C each containing a different amount of silver during the syntheses having Pt/C and Au@Pt/C as reference systems; X-Ray Diffraction (XRD), Scanning- Transmission Electron Microscopy (STEM) and Ultraviolet-Visible Spectroscopy (UV-Vis) were used to study their composition and morphology, in all cases the NPs present a crystalline structure, with different shapes indicating the formation of preferential planes (when the amount of Ag(I) agent is varied during the synthesis). To evaluate the catalytic activity, Cyclic Voltammetry (CV) and Chronoamperometry (CA) techniques were used and it was found that the catalyst Au@Pt 1/C presents the most favorable response for the MOR. Additionally, the reversal potentials study showed the behavior of the NPs in different potential sweep regions, with which it was observed that the peak formation potential, as well as the peak current density, depends considerably on the established potential window. Finally, Electrochemical Impedance Spectroscopy (EIS) was used, since it allows to differentiate different electrochemical contributions that occur during the MOR, it was observed that according to the applied potential value the shape of the impedance spectra is modified, thus, the study was divided into regions that are associated with the different processes that take place during the methanol oxidation reaction, It was corroborated by EIS that the catalyst Au@Pt 1/C presents the most favorable response since it presents lower real impedance values, which is associated with a lower resistance to the electronic transfer processes, attributing this to the presence of preferential planes for the oxidation of the methanol molecule.
Effect of payment for forest ecosystem services on forest conservation practices in Vietnam
Authors: Nguyen Minh Duc , Do Truong Lam , Do Thi Thanh Huyen , Tran Nguyen Thanh , Thi Diep Do , To-The Nguyen
Published: April 2024

Payment for forest ecosystem services (PFES) policy is a prevalent strategy designed to establish a marketplace where users compensate providers for forest ecosystem services. This research endeavours to scrutinise the impact of PFES on households’ perceptions of forest values and their behaviour towards forest conservation, in conjunction with their socio-economic circumstances and their communal involvement in forest management. By incorporating the social-ecological system framework and the theory of human behaviours in environmental conservation, this study employs a structural equations model to analyse the factors influencing individuals’ perceptions and behaviours towards forest conservation. The findings indicate that the payment of PFES significantly increases forest protection behaviour at the household level and has achieved partial success in activating community mechanisms to guide human behaviour towards forest conservation. Furthermore, it has effectively leveraged the role of state-led social organisations to alter local individuals’ perceptions and behaviours towards forest protection.
Mechanical Alloying Synthesis and Spark Plasma Sintering Consolidation of Al-Ti-Si-W Alloys
Authors: Park Bum-Soon , Park Jae-Cheol , Park Hyun-Kuk , Lee Jeong-Han
Published: April 2024

Al-Ti-Si-W quaternary powders were mechanically synthesized by planetary ball milling; and further consolidated by spark plasma sintering. The nominal compositions of the quaternary alloys were designed to be Al60Ti30Si5W5 and Al45Ti40Si10W5 (wt.%). The microstructural evolution of intermetallic compounds in Al-Ti-Si-W alloys included titanium aluminide, titanium silicide, and ternary alloys (AlxTiy, TixSiy, and TixAly,Siz), whereas W was embedded in the Al-Ti matrix as a single phase. The phase composition and grain size distribution were investigated using electron backscatter diffraction analysis, in which refined and uniform microstructures (less than 0.3 μm) were attributed to severe plastic deformation and rapid densification of the pre-alloyed powders. The mechanical properties were correlated with the Al content in the quaternary alloys; a high hardness of 1014.6 ±73.5 kg/mm2 was observed.
Characteristics of 3D Printed Functionally Graded Material for Replacement of Dissimilar Metal Weld in Nuclear Reactor
Authors: Yoon Ji-Hyun , Kim Jeoung Han
Published: April 2024

The dissimilar metal welds in the most of the reactors are connections between low alloy steel parts and stainless steel piping. There is a high possibility of primary water stress corrosion cracking (PWSCC) damage attributed to residual stress caused by the difference in material properties in the dissimilar metal weld joints. A number of accidents such as leakage of radioactive coolant due to PWSCC have been reported around the world, posing a great threat to nuclear safety. The objective of this study is to develop a technology that can fundamentally remove dissimilar metal welds by replacing the existing dissimilar metal parts with the functionally graded material (FGM) manufactured by metal 3D printing consisting of low alloy steel and austenitic stainless steel. A powder production, mixing ratio calculation, and metal 3D printing were performed to fabricate the low alloy steel-stainless steel FGM, and microstructure analysis, mechanical properties, and coefficient of thermal expansion (CTE) measurement of the FGM were performed. As a result, it is observed that CTE tended to increase as the austenite content increased in FGM. The gradual change of coefficient of thermal expansion in a FGM showed that the additive manufacturing using 3D printing was effective for preventing an abrupt change in thermal expansion properties throughout their layers.
Facile Synthesis and Li-Electroactivity of Cobalt Oxide Based on Resources Recovered from Waste Lithium-Ion Batteries
Authors: Shim Hyun-Woo , Im Byoungyong , Joo Soyeong , Kim Dae-Guen
Published: April 2024

In this study, cobalt oxide (Co3O4) powder was prepared by simple precipitation and heat-treatment process of cobalt sulfate that is recovered from waste lithium-ion batteries (LIBs), and the effect of heat-treatment on surface properties of as-synthesized Co(OH)2 powder was systematically investigated. With different heat-treatment conditions, a phase of Co(OH)2 is transformed into CoOOH and Co3O4. The result showed that the porous and large BET surface area (ca. 116 m2/g) of Co3O4 powder was prepared at 200°C for 12 h. In addition, the lithium electroactivity of Co3O4 powder was investigated. When evaluated as an anode material for LIB, it exhibited good electrochemical performance with a specific capacity of about 500 mAh g–1 at a current density of C/5 after 50 cycles, which indicates better than those of commercial graphite anode material.
The Effects of Post Weld Heat Treatment on Microstructure and Mechanical Properties of API X70 Linepipe using Submerged Arc Welding
Authors: Park Minha , Lee Gang Ho , Jang Gwangjoo , Kim Hyoung-Chan , Kim Byoungkoo , Kim Byung Jun
Published: April 2024

API X70 steel requires high strength and toughness for safety in extreme environments like high pressure and low temperature. Submerged Arc Welding (SAW ) is effective for manufacturing thick steel pipes. However, the welding heat input during SAW alters the microstructure and mechanical properties of the heat affected zone (HAZ). Therefore, investigating the correlation between microstructure and mechanical properties in welded X70 pipes is important to address potential degradation of HAZ and weld metal (WM). In this study, post weld heat treatment (PWHT) was performed to improve mechanical properties of HAZ and WM and to reduce residual stress caused by the welding process. We performed PWHT at 640°C for 15 hours and followed by air cooling. After heat treatment, we observed the microstructure through OM and SEM analysis, and investigated the mechanical properties through tensile test, hardness test, and Charpy impact test.
Improved Thermal Stability of Al-Si Alloy Coated Steel Sheet with Cr Thin Film Deposition
Authors: Kim Jae-Hyeon , Lee Jung-Ha , Lee Seung-Beop , Kim Sung-Jin , Oh Min-Suk
Published: April 2024

We investigated the effect of Cr thin film deposition on the thermal stability and corrosion resistance of hot-dip aluminized steel. A high-quality Cr thin film was deposited on the surface of the Al-9 wt. % Si-coated steel sheets by physical vapor deposition. When the Al-Si coated steel sheets were exposed to a high temperature of 500℃, Fe from the steel substrate diffused into the Al-Si coating layer resulting in discoloration. However, the highly heat-resistant Cr thin film deposited on the Al-Si coating prevented diffusion and surface exposure of Fe, improving the heat and corrosion resistances of the Al-Si alloy coated steel sheet.
Laser Weld Seam Curved Path Effect on 6063 Aluminum Alloy Strength and Temperature Distributions: COMSOL Numerical Simulation
Authors: Cui Aiyong , Liu Haodong , Gao Shaodong , Wei Huakai , Zhao Jialei
Published: April 2024

To improve the welding performance of aluminum alloys, a thermal source model of an irregular weld seam was established. COMSOL software was used for numerical simulation of the weld seam geometry effect on the temperature and stress fields in laser welding, which results were experimentally validated. The results show that the ellipsoidal laser welding melted micropool exhibited quasi-steady-state temperature field characteristics. The temperature gradient and thermal stress showed an increase followed by a decline. The temperature fluctuation amplitude of the square-tooth-shaped weld seam exceeded that of the arc-toothshaped one. The temperature evolution of the broken line tooth-shaped weld seam showed a slightly increasing trend, except for the inflection point. The experimental average tensile strength of the weld seam was the highest, reaching about 210 MPa, i.e., roughly 85% of the base material (245 MPa), which coincided with the COMSOL-based temperature field simulation results. With increasing deformation amplitude and transition radius, the maximum tensile force, tensile strength, and elongation at fracture showed an increasing trend. However, the deformation amplitude should be below a certain limit because its increase elongates the welding path and reduces the distance between weld seams, resulting in serious heat accumulation. The tensile fracture morphology of the 6063-T6 base material was curved shear, with shallow toughness pits, small tearing edges at the edges, and small granular objects, indicating small plastic deformation during the fracture process. The tensile fracture of the welded part spanned the weld seam and the base material, and the fracture occurred along the tangent direction of the weld seam. The fracture surface was smooth, the tearing edges at the edge of the toughness pit shifted along the weld seam direction, forming many co-directional slip bands, with highly pronounced plastic deformation.
Mechanical Properties of Lightweight Aggregate Concrete Containing Unground Palm Oil Fuel Ash as Partial Sand Replaceme
Authors: Hanafi H. Mohd , Muthusamy Khairunisa , Saffuan W.A. , Budiea A.M.A. , Kusbiantoro A. , Nabilla M. , Rafiza A.R. , Błoch K.
Published: April 2024

Escalating quantity of industrial by-products generated, including oil palm shell (OPS) and palm oil fuel ash (POFA ) of the palm oil industries, has been a concern to many analysts. They are mostly disposed off as wastes that would heavily impact the environment quality. Therefore, this paper aimed to investigate the possibility of consuming these wastes by using OPS and POFA as replacement materials for fine aggregates in the concrete mixture. The mixtures were prepared by integrating unground palm oil fuel ash of 0%, 10%, and 20% (by weight of sand) to produce lightweight concrete. The experiments observed the mechanical performance of these specimens for 180 curing days. The results show the enhancement of concrete strength relative to the control mixture by using 10% of ash. This is owing to void filling mechanism and product of pozzolanic reaction due to the fine particles of the ash.
Performance Analysis of Multi-Point Incremental Forming Tool using Martensitic AISI 420 Sheet Metals
Authors: Ramkumar K. , Selvarajan K.A. , Narayanan C. Sathiya , Bejaxhin A. Bovas Herbert
Published: April 2024

Incremental Sheet metal Forming (ISF) Process is a suitable process which helps to produce various parts used in automotive sector by rapid prototyping. This method of producing a prototype helps industry in reducing the production cost. In ISF process, a final product is evolved through local deformation of the sheet metal made by the tool. Usually better formability is obtained when the tool makes a better contact with the sheet metal throughout the process. Improved formability elevates dimensional accuracy of the product, thus increases the market value of the product. A new tool with multiple ball ends capable of making multiple mating points over sheet metal was used in this research to enhance the efficiency of formability and surface finish. Ability of the new Multi-Point Incremental Forming Tool (MPIF) was investigated and compared to the existing Single Point Forming Tool (SPIF) based on the formability and surface finish. Forming Limit Diagram (FLD), Strain Distribution (SD) and Scanning Electron Microscope (SEM) were used to examine the formability of the sheet metal. The SEM & 3D-Surface roughness profilometer were used to observe the sheet metals surface finish. In addition to these experimental techniques a simulation results were also used to predict the stress and strain rate during forming process. The experimentation and simulation outcome shows that the MPIF provides superior formability and surface finish.