bluuebunny/crossref_metadata_2025_split huggingface dataset:
Analysis of air particulate matter in Teflon™ and quartz filters by short-irradiation, epithermal-neutron activation with Compton suppression
Authors: Freitas M. C. , Almeida S. M. , Dung H. M. , Dionisio I. , Pacheco A. M. G. 
Published: February 2021

Abstract
This work aimed at developing methodologies to characterize the elemental composition of air particulate matter (APM) collected in Portugal, at an urban area (Lisboa, mainland Portugal) and at a remote location (Terceira island, Azores, Portugal). The Azores' collections were based on quartz filters; Teflon™ filters were used at the urban area. The main components of Teflon™ and quartz filters are fluorine and silica, respectively, the latter featuring higher levels of elements in the blanks. Al and Ti are reduced to null values when the blanks are subtracted. Epithermal short irradiation associated to Compton suppression in the measurement allowed the determination of a set of elements potentially representative of important emission sources: sea-spray (Cl, Br, Na, Mg), fuel burning (V), incineration (Cl), soil resuspension (Mg, Mn, Na, U, V), and traffic (Br, Mn). The analysis was fast due to the use of an automatic system. In some cases, the same element had different origins in the urban and remote oceanic areas.
Evaluation of the coefficient of performance of an air source heat pump unit and an air to water heat pump
Authors: Tangwe S. , Kusakana K. 
Published: February 2021

Air source heat pump (ASHP) water heaters are efficient devices for sanitary hot water heating. The coefficient of performance (COP) of the air to water heat pump (AWHP) is constantly lower than that of the corresponding ASHP unit. The study focused on determining the COP of both the ASHP unit and the AWHP. This was achieved by the implementation of both experimental and simulation methods, with the help of a data acquisition system and the REFPROP software. The system comprised of a 1.2 kW split type ASHP unit and a 150 L high pressure geyser. A power meter, flow meters, temperature sensors, pressure sensors, ambient temperature and relative humidity sensor were installed at precise locations on the split type AWHP. Controlled volumes of 150, 50 and 100 L were drawn off from the AWHP during the morning, afternoon and evening for a year. The average COP for the summer and winter, in terms of the input electrical and output thermal energies of the AWHP were 3.02 and 2.30. The COPs of the ASHP unit, in terms of the change in the enthalpies of the refrigerant at the inlet and the outlet of the condenser and the evaporator, were 3.52 and 2.65 respectively. The study showed that the difference between the COP of the ASHP unit and that of the AWHP could be ascribed to the electrical energy consumed by the fan and the water circulation pump during the vapour compression refrigeration cycles. The work provides an energy optimisation opportunity to the manufacturers of this technology, helping to enhance the efficiency and COP of ASHP water heaters.
Highlights

The COPt of the ASHP unit was higher than the COPe of the AWHP.
The COPe of the AWHP was the ratio of the input electrical energy consumed and the output thermal energy gained by the stored water.
The COPt of the ASHP unit was enthalpies-dependent and a function of inlet and outlet enthalpies of the evaporator and condenser.
The inlet and outlet refrigerant temperatures profiles of the condenser confirmed thermal energy dissipation.
Estimating wind power generation capacity in Zimbabwe using vertical wind profile extrapolation techniques: A case study
Authors: Gunda L. , Chikuni E. , Tazvinga H. , Mudare J. 
Published: February 2021

Only 40% of Zimbabwe’s population has access to electricity. The greater proportion of the power is generated from thermal stations, with some from hydro and solar energy sources. However, there is little investment in the use of wind for electricity generation except for small installations in the Eastern Highlands, as Zimbabwe generally has wind speeds which are too low to be utilised for electricity generation. This paper presents the use of vertical wind profile extrapolation methods to determine the potential of generating electricity from wind at different hub heights in Zimbabwe, using the Hellman and exponential laws to estimate wind speeds. The estimated wind speeds are used to determine the potential of generating electricity from wind. Mangwe district in Matabeleland South province of Zimbabwe was used as a test site. Online weather datasets were used to estimate the wind speeds. The investigation shows that a 2.5kW wind turbine installation in Mangwe can generate more than 3MWh of energy per annum at hub heights above 40m, which is enough to supply power to a typical Zimbabwean rural village. This result will encourage investment in the use of wind to generate electricity in Zimbabwe.
Highlights

Wind power utilisation is low in Zimbabwe.
Vertical wind profile is estimated using extrapolation methods.
Online weather data for soil and water analysis tool was used.
Electricity can viably be generated from wind in Zimbabwe.
South African shale gas economics: Analysis of the breakeven shale gas price required to develop the industry
Authors: Clark S. , Van Niekerk J.L. , Petrie J. , Fakir S. 
Published: February 2021

Is Karoo shale gas an economically viable option for providing the gas needed for the South African power grid? Dispatchable power generation is essential for the implementation of a renewable based electric grid system. Natural gas-fuelled generation is proposed to meet this need, with the gas being sourced from the Karoo. However, no exploration has been conducted on this resource and it is not known if it can be produced economically. Based on information from shale developments in other parts of the world and using publicly available information, this analysis calculates the likely price that this gas would require to be economically viable. The likely steps in the process to get to commercial development would be a baseline survey period, a period of exploration and appraisal drilling, followed by a pilot development. The extensive exploration programme would take about four years and likely cost over USD 450 million. This would be followed by a pilot production programme costing approximately USD 180 million. Once commercial development is achieved, a price for the gas of USD 13.67 per GJ would be required. There are a number of factors, including well recovery, well costs, royalties and operating costs that could add to this price and make this gas development less attractive.
Highlights

South Africa has significant shale gas potential in the Karoo.
Internationally, LNG delivered prices are currently below USD 10 per GJ.
South Africa shale gas breakeven price would be over USD 13.7 per GJ.
An extensive and expensive exploration programme is required prior to development.
A ‘semio’ approach to fashion discourse: critical perspectives on the luxury industry
Authors: Provenzano François 
Published: February 2021

This book offers rich and clear critical perspectives on the luxury fashion industry and its market mediations. It relies on a multi-layered methodology and deals with a wide variety of materials: texts, images, but also objects, experiences, exhibitions, buildings, interiors. By doing so, Mouratidou demonstrates the unity (in other words: the standard format) of the politics of re-presentation in the luxury fashion industry and the unity of the semio approach she defends. Grounded on the semiotic analysis of discourses (from Greimas to Dondero and Fontanille), this approach includes the numerous insights of the most recent works in Communication studies. The book also offers a fruitful overview of the French tradition of critical works on cultural industries and mediations (from Barthes to Jeanneret); it also sheds light – most appropriately – on this tradition’s Critical Theory background (Benjamin, Adorno & Horkheimer, Debord). In addition, we must also highlight Mouratidou’s terminological creativity. In her case studies, she proposes a range of stimulating theoretical terms, such as re-presentation, semiotic capital, culturalisation, fictivation, event-formula, and others adopted from theatre studies.
A New Tool for Detecting COVID-19 Psychological Burden Among Postacute and Long-term Care Residents (Mood-5 Scale): Observational Study
Authors: Mansbach William E , Mace Ryan A , Tanner Melissa A 
Published: February 2021

Background
Older adults are at high risk for developing serious somatic and psychological symptoms associated with COVID-19. Currently available instruments may not be sensitive to the concerns about COVID-19 in postacute and long-term care and their applications in telehealth remain to be clarified.

Objective
We investigated the psychometric properties of the Mood-5 Scale (M5) as a rapid self-assessment of the COVID-19 psychological burden among postacute and long-term care residents.

Methods
Residents (N=131), aged 50 years and above, from 20 postacute and long-term care facilities in Maryland, USA, were evaluated in-person or via telehealth (43/131, 32.8%) across a 4-week period (May 11 to June 5, 2020) during the COVID-19 pandemic. The COVID-19 psychological burden experienced by the residents was rated by geriatric psychologists who independently reviewed their clinical documentation. Psychometric analyses were performed on the M5 in relation to psychological tests, COVID-19 psychological burden, and diagnostic data collected during the evaluation.

Results
The M5 demonstrated acceptable internal consistency (Cronbach α=.77). M5 scores were not confounded by demographic variables or telehealth administration (P>.08). Convergent validity for the M5 was established via positive associations with anxiety (r=0.56, P<.001) and depressive (r=0.49, P<.001) symptoms. An M5 cutoff score of 3 demonstrated strong sensitivity (0.92) and adequate specificity (0.75) for identifying COVID-19 psychological distress among postacute and long-term care residents (area under the curve of 0.89, positive predictive value=0.79, negative predictive value=0.91).

Conclusions
The M5 is a reliable and valid tool for self-assessment of mood that can help identify postacute and long-term care residents with significant psychological burden associated with COVID-19. It can be completed in less than 1 minute and is appropriate for use in both in-person and virtual visits.
THE ANALYSIS OF ECONOMIC POTENTIAL IN NORTH SUMATERA PROVINCE
Authors: Harahap Ahmad Habibi , Nugrahadi Eko Wahyu 
Published: February 2021

Economic growth of North Sumatera Province is not quite on the top of optimum. If the compared by some of others province in Indonesia and by all of his potention, the North Sumatera Province only on the 10th rank of economic growth in Indonesia in 2009-2013 period. The purpose of this study is toanalyze the economic sectors which are the basis in each district/city in North Sumatera province and to determine the structure of economic growth in the district /city both sectoral and aggregate the province of North Sumatera. Structural transformation to some extent will have an impact on overall economic growth. Analysis tools used in this study is Location Quetiont (LQ), Growth Ratio Model (MRP), overlay analysis, and shift share analysis. Results of this study showed that the agriculture sector is a sector which is the basis in nearly 13 districts/cities in North Sumatera Province. But the growth in agriculture, processing industries, mining and quarrying, and the electricity, gas & water supply sector likely slowed, otherwise all tertiary sectors which include: trade, hotels, and restaurants; transportation and communication, finance, leasing, and services company, and the services sector is likely to experience growth positive. Transportation and communication is a sector with the highest growth occurring in North Sumatera Province. Shift Share Analysis results showed that in the Province of North Sumatera is going structural transformation characterized by decreasing the role of the agricultural sector, and the increasing role of the service sector. This condition as well as contrary to the Kuznets theory which states that the process of structural transformation contribution marked by shifting agriculture to manufacturing and then to services sector.
THE ANALYSIS OF PROGRAM IMPLEMENTATION INSTITUTIONAL ENTREPRENEUR COMMUNITY TANGAN DI ATAS (TDA) AGAINST INCREASED REVENUE LOCAL ECONOMY IN MEDAN
Authors: Putra Umar Maya 
Published: February 2021

This study aims to analyze the Program of Institutional Entrepreneur Community Tangan Di Atas (TDA) Against Increased Revenue Local Economy in Medan. The problem in this research is to see the extent to which the opportunities of independent variables such as entrepreneurship education, capital, selling price, the amount of labor, marketing through the exhibition of entrepreneurship of the dependent variable is the income of Small Enterprises assisted Institutional Tangan Di Atas (TDA) of Medan. The data used is primary data with the primary form of questionnaires to the small enterprises patronage of TDA Medan with observation period in 2013 s.d. 2015. While the methods of analysis used for primary data is Probit with analysis software program E Views 6 and secondary data obtained on a general overview of the small enterprises patronage of TDA Medan and the results of the study of literature (Library Research) to support his theories relevant to the research. From the results of this study indicate that there is a positive correlation and significant between entrepreneurship education, capital, selling price, the amount of labor and marketing aspects through the exhibition of entrepreneurship opportunity of increased revenue Small Enterprises Patronage TDA Medan otherwise there is a positive relationship and not significant among the workforce to an increased chance the small enterprises patronage of TDA revenue Medan. TDA Medan can be able to focus in increasing entrepreneurship education, marketing aspects through the exhibition of entrepreneurship, product selling prices, capital and to concentrate in the amount of labor professionally to get the result maximally to an increased chance the small enterprises patronage of TDA revenue Medan.
ANALYSIS OF FACTORS AFFECTING POVERTY IN NORTH SUMATERA PROVINCE (CASE STUDY IN 33 DISTRICT / CITY)
Authors: Avandi Yudistira , Wahyudi Setyo Tri 
Published: February 2021

The equitable poverty reduction in North Sumatera became one of the unresolved issues until now. The decreasing of poverty percentage in the last five years in North Sumatera can not represent the level of public welfare. In fact , in 2013, there were 22 out of 33 districts in North Sumatera which have the poverty percentage more than ten percent and known as hardcore poverty. The highest poverty percentage was found in North Nias and Gunung Sitoli by 30.94 %, while the lowest was found in Deli Serdang by 4.71 %. This research stated the problem “How is the influence of the economic growth, level of education, and the minimum regional wages toward the level of poverty in North Sumatera Province? The objective is to analyze the influence of economic growth, the level of education and the minimum wages toward the poor population in North Sumatera Province. This research used 165 samples that spread in 33 districts in North Sumatera from 2009 until 2013 with panel data and using Fixed Effect Model Method. The result of the Ordinary Least Square Method (LOS) through the multiple linear regretion estimated model showed that the economic growth and the minimum regional wages had negative influence, while the level of education had positive influence toward poverty in North Sumatera. The coefficient of determination (R2) is 0.948157 which means the variable of economic growth, minimum regional wages and level of education can define the poverty in North Sumatera by 94.82 %, and 5.18 % defined by other economic variables outside the model.
PENGARUH PENERAPAN STRATEGI PEMBELAJARAN THINK PAIR SHARE (TPS) TERHADAP KETERAMPILAN METAKOGNITIF, KEMAMPUAN BERPIKIR, DAN PEMAHAMAN KONSEP SISWA KELAS VII SMP NEGERI 1 PUJON DENGAN KEMAMPUAN AKADEMIK YANG BERBEDA
Authors: Yulianto Rudi 
Published: February 2021

Kegiatan belajar di sekolah dirancang untuk mencapai tujuan pembelajaran. Aspek yang harus dikembangkan dalam diri siswa yakni kemampuan berpikir dan keterampilan metakognitif. Diupayakan guru dapat dengan baik memberdayakan siswa berkemampuan akademik rendah sehingga memiliki hasil belajar yang sejajar dengan siswa berkemampuan akademik tinggi.
Penelitian ini dilakukan di SMP Negeri 1 Pujon selama semester gasal 2007/2008. Populasi dalam penelitian ini adalah seluruh siswa SMP Negeri 1 Pujon Kelas VII tahun ajaran 2007/2008. Sampel dalam penelitian ini adalah siswa kelas VII A sebagai kelas kontrol dan siswa kelas VII E sebagai kelas eksperimen. Siswa kelas VIIA terdiri atas 32 orang sedangkan siswa kelas VII E terdiri dari 35 orang. Rancangan penelitian ini adalah rancangan penelitian eksperimen semu dengan desain penelitian control group pre test post test.
Berdasarkan hasil penelitian yang telah diperoleh, terlihat bahwa strategi pembelajaran TPS dapat diandalkan dalam rangka meningkatkan keterampilan metakognitif, kemampuan berpikir, dan pemahaman konsep. Melihat fakta yang telah ditunjukkan, maka diharapkan guru dapat menerapkan penggunaan strategi pembelajaran TPS dalam kegiatan pembelajaran di sekolah. Selain itu pada penelitian ini strategi pembelajaran yang dipakai adalah strategi pembelajaran TPS, maka dapat dicobakan strategi pembelajaran lain untuk mengetahui pengaruhnya terhadap keterampilan metakogitif, kemampuan berpikir, dan pemahaman konsep siswa pada siswa dengan kemampuan akademik yang berbeda.
Studying the Physicochemical Properties and Isolation of Unsaturated Fatty Acids from Edible Oils by GC-MS and Argentated Silica Gel Chromatography
Authors: Saber Salim Najmaldain , Mohamad Hikmat Ali , Aziz Madzlan 
Published: February 2021

The core objective of this study was to investigate the physicochemical characteristics and fatty acid composition of the oils of sunflower, olive, virgin coconut and ginger oils, as well as the separation of their unsaturated fatty acids. The data indicated a significant variation in physicochemical properties (acid, saponification, ester, and iodine values) among oils. Transesterification process was carried out at a molar ratio of 1:7:0.1 of oil: methanol: KOH. Fatty acid methyl esters of oils were analyzed by infrared (IR) and gas chromatographyâ€“mass (GC-MS) spectrometry. Twelve fatty acids were identified, where the major fatty acid of olive oil was found to be oleic acid (89%), whereas those of sunflower and ginger oils were linoleic acid (80.9 %) and (79.3 %), respectively. Sunflower and olive oils were fractionated by 25% silver nitrate-impregnated silica gel column chromatography. By this method, linoleic acid methyl ester from sunflower and oleic acid methyl ester from olive oil were isolated with high purity percentages and yields. This study is significant for the development of food and pharmaceutical products.
PENERAPAN ANGGARAN BELANJA TERHADAP KINERJA OPERASIONAL DI DINAS PERTANIAN DAN PANGAN KOTA MAGELANG
Authors: Sulistyawati Yenny Yakub , Khotijah Siti Afidatul 
Published: February 2021

Penelitian ini bertujuan untuk mengetahui penerapan anggaran belanja terhadap kinerja operasional di Dinas Pertanian dan Pangan Kota Magelang. Metode penelitian yang digunakan dalam penelitian ini adalah analisis kualitatif dengan pendekatan deskriptif. Lokasi penelitian ini adalah Dinas Pertanian dan Pangan Kota Magelang. Teknik pengumpulan data dilakukan dengan observasi, dan wawancara. Setelah dilakukan penelitian, informasi dan hasil pengamatan dapat disimpulkan bahwa dalam mekanisme penerapan anggaran belanja di Dinas Pertanian dan Pangan Kota Magelang, setelah disahkan dan disetujui menjadi APBD maka RKA diubah menjadi DPA. Anggaran terhadap kinerja operasional di Dinas Pertanian dan Pangan Kota Magelang membuat berbagai macam program kegiatan yang dapat diikuti oleh masyarakat sehingga dapat dipergunakan dengan bijak dan membantu meningkatkan kesejahteraan. Selain itu, terdapat beberapa hambatan dalam pelaksanaan program kegiatan antara lain (1) hal yang tidak terduga dan berada diluar dari perencanaan serta; (2) adanya keterbatasan SDM di Dinas Pertanian dan Pangan Kota Magelang.Kata kunci: penerapan anggaran belanja, kinerja operasional, Dinas Pertaniandan Pangan Kota Magelang
ANALISIS SUARA PERNAPASAN PARU-PARU ASMA DENGAN TIDAK ASMA MENGGUNAKAN METODE K NEAREST NEIGHBORS
Authors: Satriadi Ari 
Published: February 2021

Asma adalah penyakit pada saluran napas yang menyebabkan peningkatan hiperesponsif jalan napas dan menimbulkan gejala mengi/wheeze (napas berbunyi ngik-ngik). Bunyi napas wheeze merupakan salah satu ciri yang menandakan seseorang menderita asma. Penelitian ini dilakukan untuk membuat serta menguji suatu sistem yang dapat mengidentifikasi perbedaan ciri suara pernapasan wheeze pada pasien asma dan pernapasan lainnya dengan metode k-Nearest Neighbors (k-NN). Ciri suara yang digunakan yaitu rata-rata sinyal dan standar deviasi sinyal dalam domain waktu, rata-rata spektrum, standar deviasi spektrum, magnitude tertinggi saat frekuensi 0Hz, frekuensi dengan magnitude tertinggi pertama, kedua, dan ketiga. K-NN adalah sebuah metode untuk melakukan klasifikasi terhadap objek berdasarkan data pembelajaran yang jaraknya paling dekat dengan objek tersebut. Didapatkan data suara pernapasan wheeze dan non wheeze melalui perekaman langsung kepada subjek penderita asma dan tidak asma. Dari seluruh data suara yang didapatkan kemudian dilakukan segmentasi data untuk mengambil event pernapasasn yang dibutuhkan kemudian dilakukan ekstraksi ciri untuk mendapatkan ciri matematis dari suara tersebut. 80% dari total keseluruhan data dilakukan pelatihan menggunakan metode 10 fold cross validation dan diapatkan hasil pelatihan dengan kemampuan klasifikasi maksimum pada k=3 dan k=5 dengan validitas yang sama 97,2%. Untuk pengujian kinerja k-NN pada tahap akhir diperoleh kemampuan maksimum pengklasifikasian untuk k=3 adalah 86,6% dan k=5 adalah 86,6%.
Effect Of Electroda length PENGARUH PANJANG ELEKTRODA, RESISTIVITAS TANAH DAN FREKUENSI ARUS PETIR TERHADAP IMPEDANSI PENGETANAHAN ELEKTRODA BATANG
Authors: Seniari NI Made , Dharma Bagus Widhi 
Published: February 2021

Dalam system proteksi petir eksternal, fungsi elektroda pentanahan (grounding) dalam mengalirkan arus petir ke tanah adalah hal yang penting. Untuk dapat mengalirkan arus petir ke tanah dengan cepat di perlukan impedansi pentanahan yang kecil. Untuk itu dilakukan simulasi, sejauh mana panjang elektroda, resistivitas tanah dan frekuensi arus petir berpengaruh terhadap impedansi pentanahan. Perhitungan ipedansi pentanahan secara matematis sesuai teori rangkaian listrik, dan di olah menggunakan soft wear Octave on line. Hasil menunjukkan bahwa semakin panjang elektroda, impedansi pentanahan semakin kecil. Penurunan impedansi pentanahan rata-rata setiap penambahan panjang 0,5m adalah 18,65 % dan 37,23 %, pada resistivitas tanah (ρ) = 50 Ω/m dan 100 Ω/m. Penurunan nilai impedansi ini adalah penurunan nilai impedansi pentanahan pada panjang elektroda sebelumnya. Semakin tinggi resistivitas tanah, impedansi pentanahan semakin besar. Frekuensi arus petir tidak terpengaruh pada impedansi pentanahan. Kajian ini dapat digunakan sebagai perencanaan untuk pemilihan panjang elektroda, untuk mendapatkan nilai impednsi pentanahan yang ditargetkan