bluuebunny/crossref_metadata_2025 huggingface dataset:
Varlık Fiyatlarında Spekülatif Fiyat Baloncuklarının Sağ Kuyruklu ADF Yöntemiyle Analizi
Authors: URAL Mert
Published: March 2022

Bu çalışmanın temel amacı, ekonomik göstergeler üzerinde önemli etkiye sahip olan ve son dönemde üzerlerinde çokça durulan çeşitli varlık fiyatlarında fiyat baloncuklarını araştırmaktır. Bu kapsamda emtia olarak Brent ham petrol (XBR), kıymetli maden olarak altın (XAU) ile hisse senedi olarak GameStop Corp (GME) fiyatlarında baloncukların varlığını GSADF sınamalarıyla araştırmak, ayrıca fiyat baloncuğu başlangıç ve bitiş tarihlerini belirlemek hedeflenmiştir. Bu amaçla, fiyat baloncuklarının varlığı ve gelişme dönemleri Phillips, Shi ve Yu (2015) tarafından geliştirilen özyinelemeli bir Sağ Kuyruklu (Right Tailed) Genelleştirilmiş Supremum Artırılmış Dickey Fuller Testi (GSADF) tahminlenerek belirlenmiştir. Çalışmada 02.01.2020-27.10.2021 tarihleri arasındaki USD bazlı olarak Brent ham petrol (XBR), Altın (XAU) ve Game Stop Corp (GME) hisse senedi günlük kapanış fiyatları kullanılmıştır. Elde edilen ampirik bulgular doğrultusunda Altın (XAU) fiyatlarında sadece 21.07.2020-11.08.2020 döneminde fiyat baloncuğu olduğu tespit edilmiştir. Analiz dönemi itibarıyla Brent Petrol (XBR) fiyatlarında özellikle her yıl Mart ayında bir fiyat baloncuğu oluştuğu gözlenmiştir. GameStop Corp (GME) hisse senedi fiyatlarında Ocak 2021 itibarıyla yaşanan spekülatif fiyat baloncuğunun en uzun süren ve en şiddetlisi olduğu anlaşılmıştır. Analize konu edilen varlık fiyatlarında oluşan fiyat baloncukları için ortak bir tarih ve/veya tarih aralığı söz konusu değildir.
Impact of Macro Indicators on Istanbul Stock Exchange During Covid-19 Pandemic
Authors: KAYMAZ Volkan , YILMAZ Özlem
Published: March 2022

This research analyses the effects of the macro indicators like credit default swap, exchange rate, oil prices and gold prices on the Istanbul Stock Exchange (BIST100 Index) during the Covid-19 period by applying vector autoregressive model. In the model, daily data of the indicators are considered. The analysis comprises of two periods: pre-Covid-19 period (first week of 2019 to last week of 2020) and the during Covid-19 period (first week of 2020 to the second week of 2021). The comparison of two periods determines whether Covid-19 influence the impact of macro indicators on Borsa Istanbul. The findings reveal that in the pre-Covid-19 period, the volatility in BIST100 is explained mainly by gold prices. Credit default swap, oil prices and exchange rate affected BIST100 negatively, while gold prices had a positive impact on the Index. In the Covid-19 period, the impact of credit default swap and oil prices on BIST100 increased. A negative relationship is observed between BIST100 Index and the gold prices. A positive relationship is found between BIST100 and the exchange rate. Furthermore, the exchange rate had a greater impact on BIST100 than the impact observed in the pre-Covid period.
Effects of Psidium Guajava Leaves Extract on the Viability of Echinococcus Granulosus Protoscolices in Vitro and in Vivo
Authors: Al-Arabi Fadel Y. S. , Ali Aidah M. , Omar Gozif Mohammed N. , Mehdi Mansour Abdulnabi H. , Mohsen Mohammed , Farooqui Mazahar , Pradhan Vidya
Published: March 2022

Echinococcosis is a common parasitic disease in humans and ruminants; it is considered as a health and economic problem in most parts of the world. The present study aims to evaluate the in vitro and in vivo scolicidal effects of Psidium guajava extracts on the protoscolices from hydatid cysts of Echinococcus granulosus. Protoscolices were aseptically aspirated from the livers of naturally infected sheep. Various concentrations of the extract were used for 6-48hrs. Eosin staining (0.1%) was used to determine the viability of protoscolices. The findings showed that the extract at the concentrations of 100 mg/ml killed 100% protoscolices after 48 hrs. However, the concentrations of 75 and 50 mg/ml were not effective in killing the protoscolices after 48 hrs. of exposure. The results of this investigation demonstrated that P. guajava could be used as a natural source for the production of new scolicidal agents.
Determination of Petrophysical characteristics using Techlog Software of Jeribe Reservoir in Hamrin - Allas Oilfield, Northern Iraq
Authors: Kamal Maryam , Jassim Sahar Y.
Published: March 2022

This study aims to assess the formation evaluation of the Jeribe Formation in Hamrin oilfield. The present study involved four selected wells of (Early- Mid Miocene) Jeribe Formation in Hamrin structure-Allas field; HR-2, HR-8, HR-9, and HR-16 located North of Iraq. The work deals with the available data that includes the most required information to improve such studies. Techlog Software V.2015 was used to carry out a reliable calculation of petrophysical properties utilizing conventional logs to determine the reservoir characteristics (lithology, porosity, and saturation). The computed CPI (software resulted) based on log information divided the Jeribe reservoir into two reservoir units (Jr-1 and Jr-2) within the studied wells. The calculated effective porosity and water saturation revealed that the unit Jr-1 in Hamrin- Allas oil field contains hydrocarbons at wells HR-2 and HR-16. In contrast, unit Jr-2 was 100% water-saturated along the selected well depths at wells HR-2, HR-8, HR-9, and HR-16.
Uncertainty Analysis to Assess Depth Conversion Accuracy: A Case Study of Subba Oilfield, Southern Iraq
Authors: Al-Khazraji Omar N. A. , Al-Qaraghuli Shahad A. , Abdulkareem Lamees , Idan Rami M.
Published: March 2022

The depth conversion process is a significant task in seismic interpretation to establish the link between the seismic data in the time domain and the drilled wells in the depth domain. To promote the exploration and development of the Subba oilfield, more accurate depth conversion is required. In this paper, three approaches of depth conversions: Models 1, 2, and 3 are applied from the simplest to the most complex on Nahr Umr Reservoir in Suba oilfield. This is to obtain the best approach, giving less mistakes with the actual depth at well locations and good inter/extrapolation between or away from well controls. The results of these approaches, together with the uncertainty analysis provide a reliable velocity model and more accurate predicted depth that reduced the ambiguity of the subsurface. The uncertainty analysis reveals that Model 3 is considered a more practical and most accurate approach because it gives a minimized standard deviation value of 14 with less residual and error values. The uncertainty of the depth conversion and the standard deviation values is raised towards the eastern part of the field due to an increase in the dipping depth in this region that affects the depth conversion results.
Epidemiological Study on the Prevalence of Staphylococcus aureus PVL Gene Among Healthy Community in Al- Karkh and Al -Rusaffa Districts Baghdad, Iraq
Authors: Jawad Alaa A. , Mohammed Areej A. , Al-Hashimi Amna
Published: March 2022

Five hundred nasal swabs were taken from normal medical staff and public in the city of Baghdad. Several identification parameters were used to recognize the bacterial isolates.  S. aureus isolations form nasal swabs were identified using morphology and VITECK 2 system. Polymerase chain reaction (PCR) was employed to determine PVL (Panton–Valentine leukocidin ) gene in S. aureus. The data showed no significant evidence on the relationship between PVL gene presence and gender and age of  the studied groups. There was no relation between the prevalence of PVL gene in the age groups  of  21-30 years (p=0.328) and 31-40 years (p=0.682).

The results showed that 38.4% and 37.5% S. aureus isolates were isolated from nurses  working at Baghdad Teaching Hospital and AL-Yarmouk Teaching Hospital, respectively, while, doctors,  pharmacists, and radiology staff were negative  (0.00%).

There was no significant difference between hospital staff and community  in AL-Karkh (p=0.838) and in AL-Rusafa (p=0.118).
Linear and Non-Linear Stability Analysis for Thermal Convection in A Bidispersive Porous Medium with Thermal Non-Equilibrium Effects
Authors: Mankhi Israa Mkheilef , Haddad Shatha Ahmed
Published: March 2022

The linear instability and nonlinear stability analyses are performed for the model of bidispersive local thermal non-equilibrium flow. The effect of local thermal non-equilibrium on the onset of convection in a bidispersive porous medium of Darcy type is investigated.  The temperatures in the macropores and micropores are allowed to be different. The effects of various interaction parameters on the stability of the system are discussed. In particular, the effects of the porosity modified conductivity ratio parameters,  and , with the inter-phase momentum transfer parameters and, on the onset of thermal Convection are also considered. Furthermore, the nonlinear stability boundary is found to be below the linear instability threshold. The numerical results are presented for free-free boundary conditions.
An application of Bacteriocin-Producing Vaginal Lactobacillus Crispatus IS30 in A Gel Formula Against Some Vaginal Pathogens
Authors: Tareq Israa , Luti Khalid Jaber Kadhum
Published: March 2022

The aim of this study was to evaluate the possibility of using Lactobacillus cells as a probiotic to treat some vaginal infections. For this purpose, thirty Lactobacillus isolates were collected from vaginal samples subjected to a screening program to investigate their antagonism abilities against four vaginosis species: Pseudomonas aeruginosa, Escherichia coli, Klebsiella pneumonia and Proteus spp.  Eighteen isolates were selected from the primary screening (agar plug diffusion method) based on their ability to inhibit the growth of 4 indicators which then subjected to a secondary screening program with two methods: detection of bacteriocin activity and biofilm forming capacity. The isolate Lactobacillus IS30 was selected based on its high bacteriocin production as well as being biofilm producer. Further identification tests revealed that isolate IS30 was Lactobacillus crispatus. Optimization experiments revealed that MRS broth was the best medium for bacteriocin and biomass production with glucose and yeast extract as best carbon and nitrogen sources. The maximum production observed in optimized culture was 15.9 mg/mL and 40 AU/mL for biomass and bacteriocin production respectively, hence this medium was used in the preparation of the formula containing Lactobacillus IS30 cells. Study the probiotic properties demonstrated the capability of Lactobacillus crispatus IS30 cells to tolerate the high acidity with an ability to adhere to vaginal epithelial cells. Moreover, Lactobacillus crispatus IS30 showed ability to auto-aggregation (72.66%) and 58% of Pseudomonas co-aggregation percentage after 5 hours. Lactobacillus crispatus IS30 cells was successfully incorporated into a gel bases formula and results revealed that cells have kept their viability over 14 days with an ability to produce and releasing the bacteriocin. The formula was tested against P. aeruginosa and E. coli and results confirmed its activity on both species.
Chemiker HTL: heute und morgen
Authors: Bührer Heiner G.
Published: March 2022

Chemikerinnen und Chemiker HTL sind in der industriellen Praxis geschätzte Kaderleute, doch ist ihre Aushildung und die Bedeutung ihres Berufstandes leider zu wenig bekannt. Der folgende Artikel will deshalb–als Einstieg zu den nachfolgenden Porträts der einzelnen Schulen–einige
Fragen beantworten: Wer wird Chemiker HTL? Welche Schulen bieten dieses Studium an? Wie sind die Berufsaussichten in einem Europa des Umhruchs? Welches sind die Weiterbildungsmöglichkeiten? Chemikerinnen und Chemiker HTL sind in der industriellen Praxis geschätzte Kaderleute,
doch ist ihre Aushildung und die Bedeutung ihres Berufstandes leider zu wenig bekannt. Derfolgende Artikel will deshalb–als Einstieg zu den nachfolgenden Porträts der einzelnen Schulen–einige Fragen beantworten: Wer wird Chemiker HTL? Welche Schulen bieten dieses Studium an?
Wie sind die Berufsaussichten in einem Europa des Umhruchs? Welches sind die Weiterbildungsmöglichkeiten?
Liposomes and Immunoliposomes as Carriers for Cytostatic Drugs, Magnetic Resonance Contrast Agents, and Fluorescent Chelates
Authors: Schwendener Reto A.
Published: March 2022

Biological and medical applications of liposomes as carriers for cytostatic drugs, magnetic-resonance contrast agents, and fluorescent markers are presented. The cytostatic effects of liposomal preparations of lipophilic derivatives of cytosine arabinoside (ara-C), namely N4-oleyl-ara-C (NOAC) and N4-alkyl-ara-C are demonstrated in the mouse Ll210 tumor model. Liposomal drugs were more effective by factors of 2–10 as compared to ara-C administered in aqueous preparations. Synergistic effects of the combination of ara-C and mitoxantrone could be shown, again with significantly increased effects, when the drugs were administered in liposomes. A practical detergent-dialysis method for the preparation of large volumes of sterile liposomes for clinical use is presented. Clinical phase I/II studies of Iiposoma I NOAC and mitoxantrone are currently in progress. Methods of preparation of immunoliposomes, i.e. the coupling of antibodies or antibody subunits to liposome membranes, are discussed' and results of specific immunoliposome – cell binding are presented. Possibilities of increasing the blood circulation times of liposomes by incorporation of lipophilic derivatives of poly(ethylene glycol) into the liposome membranes are shown. The successful application of liposomes as carriers of paramagnetic metal complexes as contrast agents in magnetic-resonance imaging for liver and spleen is documented. Finally, the concept of liposomes as carriers for fluorescent Europium chelates as markers for time-resolved flow cytometric applications are presented.
Schutz gegen industrielle Schadstoffe durch den ABC-Schutzfilter 74
Authors: Arnold Werner , Lavanchy André
Published: March 2022

This paper reports protection performance data of the NBC-canister (NBC-SF 74) against some important industrial agents under various experimental conditions (humidity, challenge concentration). The principles of construction and function of the NBC-SF 74 are explained, and a description
of the measuring apparatus is given. The protection capabilities against different compounds are discussed, and for 25 substances the evaluated data listed. For challenge concentrations below 0.5 vol.-% and agents with b.p. > 65°, sufficient protection levels are observed. The protection
levels against industrial agents with low b.p. are lower and must be carefully evaluated as a function of the prevailing environment conditions.
Impact of NOTAM on security and efficiency performance of flights (overview)
Authors: Prokhorov A. V.
Published: March 2022

The purpose of this work is to analyze and assess the impact of NOTAM on the flight safety and efficiency. The main problems associated with NOTAM were considered: number of NOTAMs, the practical use of NOTAM information, technical limitations of the current NOTAM system. Examples of the negative impact of NOTAM on the quality of air navigation support, safety and efficiency of flights are presented. Also, the best practice of solving problems, related to NOTAM in the world, is presented with using: Q-code and flight planning systems (on the example of Lido Flight 4D). The concept of the European AIS Database (EAD), developed on the basis of the Aeronautical Information Exchange Model (AIXM), is presented. The concept of Digital NOTAM, implemented on the basis of AIXM and intended for the exchange, automatic processing and interpretation of the dynamic aeronautical data, is considered. The research studies the new modernized NOTAM system – Federal NOTAM System (FNS – Federal NOTAM System), developed by the Federal Aviation Administration (FAA) of the United States, which allows encoding the Digital NOTAM. ICAO's plans for the transition from the concept of Aeronautical Information Service (AIS) to the Aeronautical Information Management (AIM), applying the principles of the System Wide Information Management (SWIM) concept, were analyzed. As a result of the analysis of the current NOTAM system and the modernized NOTAM system (FNS from FAA), conclusions were drawn that the implementation of Digital NOTAM should solve the technical part of the problems associated with NOTAM, brought about by the use of modern communications (internet) and new data exchange standards (AIXM), which, as a result, will lead to an increase in the level of safety and efficiency of flights. At the same time, problems with NOTAM caused by human factors remain unresolved, due to incorrect use of the NOTAM instrument.
EFEKTIVITAS EKSTRAK DAUN PANDAN WANGI (Pandanus amaryllifolius) SEBAGAI BIOLARVASIDA TERHADAP LARVA Culex Sp.
Authors: Putri Irma Novita Andini , Yushananta Prayudhy
Published: March 2022

Penggunaan pestisida kimia dapat menimbulkan efek toksik bagi manusia, lingkungan maupun serangga non target. Penelitian bertujuan untuk menganalisis efektifitas ekstrak daun pandan wangi (Pandanus amaryllifolius) terhadap kematian larva Culex sp instar-III. Eksperimen menggunakan rancangan acak lengkap factorial dengan dua kali ulangan, pada empat level konsentrasi dan lima level waktu kontak. Larva dikembangkan dari daerah pemukiman melalui proses rearing dua tahap. Uji bioassay dilakukan pada setiap perlakuan sebanyak 25 ekor. Hasil penelitian membuktikan bahwa konsentrasi bepengaruh terhadap kematian larva (p-value=0,000), demikian pula lama waktu kontak (p-value=0,003), serta interaksi konsentrasi dan waktu kontak (p-value = 0,00001). Konsentrasi menunjukkan asosiasi yang lebih kuat (88,3%) dibandingkan waktu kontak (75,3%) dan interaksi konsentrasi dan waktu kontak (78,5%). Nilai LC50 diperoleh sebesar 1,72%. Penelitian telah membuktikan bahwa ekstrak daun Pandanus amaryllifolius dapat digunakan sebagai biolarvasida terhadap larva Culex sp. Perlu penelitian lanjutan untuk mengetahui pengaruh terhadap serangga non target, bentuk sediaan ekstrak siap pakai, serta perbandingan dengan bioinsectisida lainnya.
Differences in Marijuana Use, Consequences, and Motives based on Young Adults’ Interest in Reducing their Marijuana Use or Consequences: May 2021 Data from a High-risk Community Sample
Authors: Fairlie Anne , Lee Christine , Larimer Mary
Published: March 2022

Purpose. This study contributes to our understanding of the factors associated with young adults’ interest in reducing their marijuana use or consequences during the COVID-19 pandemic. This study compared high-risk young adults who indicated they were open to or thinking about changing their marijuana use to those who were satisfied with their marijuana use. These two groups were compared on biological sex, age, marijuana use, consequences, and 12 motives. Method. The data were part of a larger longitudinal study that recruited a community sample of young adults from the Seattle WA area (ages 18-25 at recruitment), who reported recent alcohol use and also simultaneous alcohol and marijuana use. Participants were recruited through various methods including social media and Craigslist advertisements. Participants completed a baseline survey and six 2-week bursts of online daily surveys across two years as well as other follow-up surveys. Data presented here were collected in May 2021, the final follow-up assessment point. May 2021 data were collected from 376 participants (92% of the original recruited sample), and the current analyses focus on the 265 participants who reported using marijuana in the past month (50.6% females, 48.68% non-Hispanic/Latinx White, mean age = 24.58 (SD = 2.20). Results. Over one-third (37.7%, n = 100) indicated they were open to changing or currently thinking about changing their marijuana use by using less or by reducing marijuana’s negative effects. Almost two-thirds (60.4%, n = 160) indicated they were satisfied with their use of marijuana, 1.5% (n = 4) indicated they were currently seeking or in treatment for marijuana use, and 0.4% (n = 1) did not provide a response. More men (44.60%) than women (32.30%) indicated they were open to changing or currently thinking about changing their marijuana use by using less or by reducing marijuana’s negative effects. Young adults who indicated they were open to or thinking about changing their use reported significantly more hours high in a typical week and more marijuana consequences than those who were satisfied with their use of marijuana. Finally, young adults who indicated they were open to or thinking about changing their use reported significantly higher scores for the following seven marijuana motives: coping, boredom, altered perceptions, social anxiety, perceived low risk, sleep, and availability. No differences were found for five marijuana motives: enjoyment, conformity, experimentation, alcohol-related, and celebration. Conclusions. Findings underscore the potential role of negative consequences as a motivator for young adults’ interest in reducing their marijuana use. Coping motives, social anxiety motives, and sleep motives may be of particular importance with respect to young adults’ self-motivation to change and facilitating the process of change.
Effort-Based Decision Making and Self-Reported Apathy in Frequent Cannabis Users and Healthy Controls
Authors: Vele Kimberly , Cavalli Jessica , Cservenka Anita
Published: March 2022

Background: Cannabis use rates have been escalating in recent years within the United States, and the effects of cannabis on motivation and effort-based decision making have been of increased interest. Amotivational syndrome is a term used to refer to lack of motivation, passive personality, non-productive behavior, and lower educational attainment related to chronic cannabis use. However, past literature has reported mixed findings for the effects of cannabis on motivation across both behavioral and self-report studies; therefore, the current study aimed to evaluate the association between frequent cannabis use, motivated behavior, and self-reported apathy in individuals 18 years and older. Methods: Cannabis users who reported, on average, 3 or more days/week of cannabis use over the past year, and healthy controls who reported once/month or less cannabis use over the past year were recruited. Participants withheld from substance use 12 hours prior to the study visit. They completed a breathalyzer test, urine toxicology screen, the Apathy Evaluation Scale (AES), and the Effort Expenditure for Rewards Task (EEfRT), a computerized button-pressing task that measures effort-based decision making whereby individuals must increase effort for monetary reward. There were no significant differences between groups on any demographic characteristics except for past 30-day alcohol use (p = 0.001), and depression scores (p = 0.005; determined by the Beck Depression Inventory-II), which were both greater in cannabis users relative to healthy controls. A repeated measures analysis of covariance (ANCOVA) was used to examine the effects of Group, reward magnitude, probability, and their interaction on hard task selections on the EEfRT, controlling for alcohol and depressive symptoms. A separate ANCOVA examined between-group differences on the AES with the same covariates. Results: The main results indicated that relative to healthy controls, cannabis users were significantly more likely to select hard tasks on the EEfRT regardless of reward magnitude or probability of winning the reward (p = 0.014, partial η2=0.10). Self-reported apathy was higher in cannabis users relative to controls (p = 0.02), but after controlling for alcohol use and depressive symptoms, these group differences were no longer significant (p = 0.46). Furthermore, the number of hard task selections on the EEfRT was not significantly related to self-reported apathy in cannabis users (p = 0.68), or healthy controls (p = 0.52). Conclusions: These findings indicate that cannabis users exhibit a greater likelihood of exerting more effort for reward, suggesting enhanced motivation relative to healthy controls. Thus, the current results do not support the amotivation hypothesis in adult frequent cannabis users. Despite some harms of frequent cannabis use, amotivation may not be among them.
Studi Banding Pemakaian Pasir Bekas dan Pasir Baru terhadap Karakteristik Cetakan Co2- Process
Authors: Ambardi Pradoto , Mulyana Herna , Ganjar Moh Adi
Published: March 2022

Didalam Industri pengecoran logam, pasir cetakan CO2-process hanya digunakan untuk sekali pakai. Hal tersebut menyebabkan jumlah pasir bekas menjadi sangat banyak dan akan mencemari lingkungan. Untuk mengatasi masalah tersebut perlu diupayakan adanya proses reklamasi terhadap pasir bekas cetakan CO2. Oleh karena itu pada kesempatan ini dilakukan penelitian pendahuluan untuk mengetahui karakteristik cetakan cetakan CO2 yang menggunakan pasir bekas dan pasir baru dengan variasi jumlah bahan pengikat sebanyak 3, 4, dan 5% dari berat pasir.

Permukaan cetakan yang dihasilkan dari pemakaian pasir bekas juga terlihat lebih kasar dibandingkan dengan pasir baru karena ukuran rata-rata butir pasir bekas (0,4 mm) lebih besar dibandingkan dengan pasir baru (0,27 mm). Peningkatan kandungan waterglass menyebabkan kekuatan cetakan pasir bekas maupun pasir baru meningkat, tetapi permeabilitas cetakan menjadi turun. Permeabilitas dan kekuatan tekan yang dihasilkan dari pemakaian pasir bekas jauh lebih rendah jika bibandingkan dengan pasir baru.
Pediatric Colorectal Cancer: Case Report
Authors:   Debeau, M., Monteiro, A., Leja, J.
Published: March 2022

Background: Colorectal cancer (CRC) predominately affects adults over the age of 50, however it occasionally occurs in young patients. Case: This case observes the presentation and management of a 14-year-old African American male (AAM) who presented to the emergency department with a two-week history of insidious onset RLQ abdominal pain. Evaluation of suspected small bowel obstruction with computed tomography raised alarm for a mass lesion causing the obstruction. Subsequent barium enema, colonoscopy, and histological analysis diagnosed colorectal cancer. The patient then underwent surgery, chemotherapy, and radiation for stage IIIc CRC. Conclusion: We use this case to argue for the development of a genetic panel that can screen for high-risk mutations so detected patients can pursue early and frequent screening protocols such as colonoscopy. We demonstrate the importance of early intervention by discussing the prognosis of patients that are discovered after a change in bowel habits.
BRUSH-STROKES FOR A PORTRAIT
Authors: Sokolov Mikhail N.
Published: March 2022

This publication is a reprint of a study by the now deceased M.N. Sokolov in a collection of articles dedicated to the thirtieth anniversary of I.E.Danilova as Deputy Director for research of the A.S. Pushkin State Museum of Fine Arts [Sokolov 1997, pp. 22–23]. It is not a memoir about a late senior colleague, but rather a dithyramb addressed to the still living and active leader of the Museum’s academic life and its human community. M.N. Sokolov managed to outline in a short witty essay the main features of I.E. Danilova as a researcher and as a human being.
Pedagogical education in the cultural and educational space of a modern university. Materials of the international scientific-practical conference «Rosov Readings»
Authors: Borisenkov V.
Published: March 2022

The book discusses the processes taking place in pedagogical education, analyzes modern approaches, ideas, technologies for transforming the training of pedagogical personnel in line with the scientific and pedagogical heritage of N. Kh. Rozov. The materials of reports and messages of scientists, young researchers and practicing teachers on the problems of modern strategies, models and technologies of pedagogical education are presented. It is addressed to teachers, scientists, educators, graduate students, employees of higher education institutions, and the general pedagogical community.
Potensi Pengembangan CNG Darat (Terrestrial CNG) di Indonesia
Authors: Lubad Aziz Masykur , Widiastuti Paramita
Published: March 2022

Bahan Bakar Minyak (BBM) masih menjadi sumber energi utama di Indonesia hingga saatini. Namum demikian, tingginya harga minyak bumi dalam beberapa tahun terakhir telah mendorongkonsumen BBM mencari sumber energi alternatif yang lebih murah. Di tengah ketidakstabilandan tingginya harga BBM, gas bumi muncul sebagai salah satu sumber energi alternatif. Selainharganya lebih murah, gas bumi lebih ramah lingkungan. Sejauh ini, kendala utama pemanfaatangas bumi di Indonesia adalah ketersediaan infrastruktur transportasi gas bumi yang belum memadai.Jaringan pipa transmisi dan distribusi yang selama ini digunakan sebagai moda transportasi utamagas bumi di Indonesia memiliki beberapa keterbatasan seperti jarak sumber gas ke konsumencukup jauh sehingga secara teknis maupun keekonomian tidak memungkinkan dikembangkanjaringan pipa. Untuk mengatasi hal itu diperlukan suatu solusi alternatif yang ekonomis untukmenyalurkan gas bumi ke sektor konsumen yang membutuhkan. Salah satu solusi untuk mengatasikendala tersebut adalah dengan menggunakan teknologi Compressed Natural Gas (CNG) yangsaat ini telah digunakan secara luas di beberapa negara seperti Amerika Serikat, India, Cina,Thailand dan lain-lain. Teknologi ini diharapkan mampu mengakomodasi kendala transportasi gasbumi ke konsumen-konsumen yang tidak terjangkau oleh infrastruktur jaringan pipa gas bumi.
Pembuatan Bahan Bakar Minyak Solar 48 Bertitik Nyala Minimum 550C dan 520C Melalui Cutting Distillation
Authors: Yuliarita Emi
Published: March 2022

Pada saat ini batasan titik nyala yang ditentukan untuk minyak Solar 48 di Indonesia adalahminimum 60°C, yang lebih tinggi dibandingkan dengan negara-negara lain. Oleh karena itu penelitianini bertujuan untuk membuat minyak Solar 48 dengan titik nyala minimum 55oC dan 52oC denganmenggunakan metode cutting distillation. Proses cutting distillation dilakukan terhadapcampuran 50:50 minyak tanah dan minyak solar pada temperatur penguapan distilat berkisarantara 10% sampai 40% dari volume distilat. Sisa campuran bahan bakar yang diperoleh daripemotongan distilasi yang mempunyai angka setana paling mendekati 48 digunakan sebagaikomponen dasar untuk pembuatan minyak Solar 48 bertitik nyala 55oC dan 52oC. Kemudianfraksi nafta digunakan untuk membuat penyesuaian titik nyala.Berdasarkan hasil uji sifat-sifat fisika/kimia minyak solar 48 bertitik nyala 55oC dan 52oCyang dihasilkan dalam penelitian ini adalah sesuai dengan spesifikasi minyak Solar 48 yangberlaku di Indonesia sebagaimana diatur dalam Surat Keputusan Dirjen Migas No. 3675 K/24/DJM/2006 tanggal 17 Maret 2006.
Cadangan Strategis Minyak untuk Keamanan Energi Indonesia
Authors: Rahman Maizar
Published: March 2022

Gangguan pasokan minyak mentah dan bahan bakar minyak berakibat parah kepadaperekonomian negara yang terkena, bahkan juga kepada situasi yang dapat menimbulkanketidakstabilan sosial politik. Untuk itu diperlukan cadangan penyangga energi untuk ketahananenergi negara tersebut.Keamanan energi Indonesia sudah dalam situasi rawan terhadap gangguan pasokan, baikdalam hal distribusi bahan bakar minyak di dalam negeri maupun dalam pengadaan impor minyakmentah untuk kilang-kilang di dalam negeri dan impor bahan bakar minyakUndang-undang dan peraturan-peraturan terkait sudah mengamanatkan ketersediaan energipenyangga ataupun cadangan strategis minyak bumi dan penyediaan bahan bakar minyak nasional.Disarankan agar Indonesia membangun simpanan minyak mentah dan bahan bakar minyak,pada tahap awal, sekurangnya untuk 30 hari impor.Tangki-tangki yang tidak terpakai sepenuhnya yang berada di Pertamina maupun di badanusaha kontrak kerja sama serta di depot-depot dan kilang-kilang dapat dimanfaatkan sebagaipenyimpan cadangan minyak dan bahan bakar minyak.Kerja sama regional ASEAN harus lebih dikonkretkan, untuk dapat memperkuat keamananenergi para anggotanya, terutama di saat kritis atau kelangkaan pasokan.
Analisis Tingkat Penguapan pada Minyak Lumas Transmisi
Authors: Fibria Milda , R Catur Yuliani , Hanifuddin M
Published: March 2022

Proses transmisi roda gigi memungkinkan terjadinya slip yang mengakibatkan terjadinyapemanasan ekstrem di dalam gearbox. Kondisi ini selain dapat mengoksidasi minyak lumasdengan cepat juga akan menyebabkan penguapan berlebih yang berefek pada berkurangnyapelumasan hingga tidak mampu lagi melumasi dengan baik. Untuk mengetahui kehilangan minyaklumas, maka dilakukan pengujian terhadap beberapa minyak lumas transmisi roda gigi padalaboratorium semi-unjuk kerja minyak lumas. Dengan metode ASTM D 5800, minyak lumasdipanaskan pada suhu 2500C selama satu jam dengan tekanan 2 mbar menggunakan alat ujiNoack evaporation tester. Hasilnya adalah pada beberapa minyak lumas roda gigi SAE 90,penguapan yang terjadi cukup besar bahkan mencapai lebih dari 30%. Sehingga pemilihan terhadapbase oil dari pelumas haruslah diperhatikan.
Efek Berat Molekul Polietilen Glikol (PEG) pada Membran Selulosa Asetat terhadap Selektifitas Pemisahan Gas CO2/CH4
Authors: Lucia Anda , Adiwar Adiwar
Published: March 2022

Pemisahan gas CO2 pada gas alam telah dilakukan dengan distilasi kriogenik dan adsorpsi.Namun belakangan ini, proses pemisahan CO2 menggunakan membran menunjukan cukupberpotensi dikarenakan kesederhanaannya, mudah dikontrol, kompak, murah dan pemakaian energiyang sedikit. Penggunaan membran dengan fasilitas perpindahan lebih menarik perhatian sepertimembran dengan pembawa tetap (fixed carrier) karena mempunyai kelebihan yaitu disampingdaya tahan yang cukup baik, juga dapat ditingkatkannya permeabilitas dan selektifitas membranterhadap pemisahan gas diakibatkan reaksi reversible antara pembawa dalam membran. Penelitianini diarahkan pada pemakaian PEG dengan berbagai berat molekul sebagai pembawa tetap danbertujuan untuk mengetahui pengaruh berat molekul PEG terhadap selektifitas pemisahan. Membrandengan pembawa PEG dapat menghasilkan laju permeasi sebesar 2.55 x 10–6 cm3 (STP) cm-2 s-1cm Hg pada tekanan 20 psi.
Pemodelan Sekuestrasi Gas CO2 pada Saline Aquifer dengan Mekanisme Perubahan Fase dan Alterasi Mineral
Authors: Anggraeni Septi , Tobing Edward ML
Published: March 2022

Salah satu teknologi yang dapat diterapkan untuk mengatasi terbuangnya emisi gas CO2 keatmosfir bumi dari industri yang menggunakan bahan bakar fosil adalah Carbon Capture andStorage (CCS). Dengan teknologi ini emisi gas CO2 dapat dipisahkan, disalurkan dan kemudiandiinjeksikan ke tempat penyimpanan (sekuestrasi) di formasi geologi, atau dalam rangka penerapanEnhanced Oil Recovery (EOR) untuk meningkatkan produksi dari reservoir minyak pada tahaptersier. Emisi gas CO2 tersebut dapat juga disimpan pada depleted reservoir gas, lapisan batubaraatau saline aquifer (reservoir air bersalinitas tinggi). Sebagai tempat penyimpanan gas CO2,saline aquifer dianggap cukup aman karena dengan berjalannya waktu, maka gas CO2 yang larutdalam air garam akan mengalami proses mineralisasi dan pengendapan. Di dalam reservoir salineaquifer, mekanisme penyimpanan gas CO2 terdiri atas tiga tahap yaitu pada tahap pertama, gasCO2 akan disimpan sebagai gas atau fluida supercritical pada reservoir yang mempunyai lapisantidak permeabel sebagai lapisan penutup (cap rock). Pada tahap kedua, gas CO2 akan larut kedalam air yang mengakibatkan perubahan sifat kebasaan air dan memengaruhi kelarutan mineralyang terkandung dalam batuan. Dan tahap ketiga, gas CO2 akan berinteraksi dengan mineralyang terkandung dalam batuan dan menghasilkan mineral baru yang dapat menyimpan gas CO2.Pemodelan simulasi sekuestrasi gas CO2 pada saline aquifer berbentuk radial satu dimensi telahdilakukan dengan menggunakan simulator ToughReact yang dapat merepresentasikan mekanismepenyimpanan gas CO2 tersebut diatas dan memperkirakan kapasitas atau kemampuan reservoirmenyimpan gas CO2. Selain itu dapat diketahui penyebaran distribusi saturasi gas CO2, perubahanpH yang mengakibatkan proses geokimia antara gas CO2 dengan mineral dalam batuan pasir sertamineral yang terbentuk dari proses geokimia, dan perubahan porositas akibat perubahan mineral.Hasil penelitian ini menunjukkan bahwa potensi gas CO2 yang dapat tersekuestrasi secara permanenpada saline aquifer untuk laju alir injeksi sebesar 90 kg/detik, 140 kg/detik dan 190 kg/detik selama10 tahun masing masing sebesar 28.4 juta ton, 44.2 juta ton, dan 60.0 juta ton CO2.
Efisiensi Katalitik Konverter dalam Mengurangi Emisi Karbon Monoksida dan Hidrokarbon pada Bahan Bakar Bensin 88
Authors: Maymuchar Maymuchar , Rulianto Dimitri
Published: March 2022

Karbon monoksida (CO) dan hidrokarbon (HC) merupakan sebagian dari gas buang produk dariproses pembakaran pada mesin kendaraan. Salah satu usaha untuk mengurangi gas buang ini adalahdengan menggunakan teknologi aftertreatment. Teknologi aftertreatment pada kendaraan berbahanbakar bensin adalah katalitik konverter. Proses oksidasi yang terjadi pada katalitik konverter akanmengubah sebagian CO dan HC menjadi CO2. Penelitian ini bertujuan untuk mengetahui effisiensikatalitik konverter pada kendaraan yang berbahan bakar bensin 88 tanpa timbal. Pengukuran emisigas buang dilakukan sebelum uji jalan (0 km), setiap 2.500 km sampai 10.000 km. Effisiensikatalitik konverter dalam menurunkan emisi CO sebesar 31,4% pada jarak tempuh 0 km danmenurun menjadi 25,9% pada jarak tempuh 10.000 km. Sedangkan effisiensi katalitik konverterdalam menurunkan emisi HC sebesar 29,9% pada jarak tempuh 0 km dan menurun menjadi 13,2%pada jarak tempuh 10.000 km. Kandungan sulfur dan timbal serta teknologi mesin menjadi faktormempercepat turunnya efisiensi katalitik konverter.
Pengujian kinerja terbatas Minyak Solar Bertitik Nyala 55oC dan 52oC pada Bangku Uji Multisilinder
Authors: Yuliarita Emi
Published: March 2022

Dalam penelitian terdahulu telah dilakukan pembuatan bahan bakar minyak solar 48 bertitiknyala 55oC dan 52oC melalui cutting distillation. Dari hasil analisis sifat-sifat fisika/kimia masingmasingminyak solar bertitik nyala 55oC dan 52oC yang didapatkan, dapat memenuhi spesifikasiminyak solar 48 yang di tetapkan pemerintah sesuai dengan surat keputusan Dirjen Migas No.3675 K/24/DJM/2006 tanggal 17 Maret 2006. Selanjutnya untuk melihat kinerja (performance)dari masing-masing bahan bakar tersebut maka dilakukan pengujian kinerja terbatas terhadapmasing-masing bahan bakar minyak solar bertitik nyala 55oC dan 52oC pada bangku uji multisilinder(Multisylinder Test Bench) dengan menggunakan mesin diesel Isuzu 4JA1) pada tiga kategoribeban. Hasil uji kinerja secara keseluruhan memperlihatkan bahwa minyak solar bertitik nyala55oC dan 52oC sedikit lebih kecil dari minyak solar bertitik nyala 60oC. Namun emisi gas buangkepekatan asap/opasitas minyak solar bertitik nyala 55oC dan 52oC jauh lebih rendah disbandingminyak solar bertitik nyala 60oC.
Fluida Incompressible sebagai Penyalur Tenaga dalam Sistem Hidrolik Tertutup
Authors: Karina Rona Malam
Published: March 2022

Fluida incompressible adalah cairan yang penggunaannya sebagai penyalur tenaga dalam sistemhidrolik karena sifatnya dalam sistem tertutup seperti dalam sistem bejana berhubungan, yangdapat juga disebut minyak rem. Kerja sistem rem dari master silinder ke piston untuk mentransferenergi mekanis dapat menghasilkan panas akibat gesekan antara minyak rem dengan permukaansalurannya. Kondisi tersebut menyebabkan minyak rem harus memiliki spesifikasi khususberkaitan dengan perubahan suhu, yaitu titik didih dan sifatnya yang tidak berubah drastis padasuhu tinggi. Penelitian ini bertujuan menghasilkan formula minyak rem DOT 3 untuk kendaraanbermotor menggunakan bahan dasar dan pelarut kimia dengan perbandingan komposisi ± 20%dan ± 80%, serta ditambahkan sedikit aditif. Hasil yang diperoleh dari analisis karakteristik fisikakimia serta semi unjuk kerjanya menunjukkan bahwa dari empat formula yang dirancang terdapatsatu formula yang hasil analisisnya memenuhi syarat spesifikasi minyak rem DOT 3, yaitu formulaFMR 4. Namun, kualitas yang sebenarnya dapat dilihat dalam uji performa apabila diaplikasikanpada sistem pengereman kendaraan bermotor.
On Micro-generalized Closed Sets and Micro-generalized Continuity in Micro Topological Spaces
Authors: Jasim Taha H. , Mohsen Saja S. , Eke Kanayo Stella
Published: March 2022

TheÂ  purpose of this paper is toÂ  define and studyÂ  a newÂ  class of sets called microÂ  generalizedÂ  closed sets and defineÂ  micro generalized continuous function and irresolute micro generalized continuous functionÂ  in micro topological spaces. Basic properties of micro generalized closed setsÂ  and its characterizations are analyzed.
Double Integral of Logarithm and Exponential Function Expressed in terms of the Lerch Function
Authors: Reynolds Robert , Stauffer Allan
Published: March 2022

This paper contains new explicit computations of some integrals containing elementary functions, such as powers, logarithms, exponentials. In this work the authors use their contour integral method to derive a double integral connected to the modified Bessel function of the second kind $K_{\nu}(z)$ and express it in terms of the Lerch function. A table of integral pairs is given for interested readers. The majority of the results in this work are new.
Definite Integral of Exponential Polynomial and Hyperbolic Function in terms of the Incomplete Gamma Function
Authors: Reynolds Robert , Stauffer Allan
Published: March 2022

This current paper is a table of definite integrals involving hyperbolic and logarithmic functions expressed in terms of the incomplete gamma function and fundamental constants. All the results in this work are new.
Definite Integral of Logarithmic Power and Square Root Algebraic Functions Expressed in terms of the Lerch Function
Authors: Reynolds Robert , Stauffer Allan
Published: March 2022

A definite integral involving the power square root of an algebraic function is derived in terms of the Lerch function. A table consisting of mostly new results is given for easy reading. The majority of the results in this work are new.
Developing Just-In-Time and Network Flow Models For Urban Snow Removal Problem
Authors: Bandpey Zeinab , Tannouri Ahlam , Brown Isabelle Kemajou , Nkwanta Asamoah
Published: March 2022

Winter urban traffic issues and performance present critical problems in large cities and metropolitan areas. In urban areas, there is a critical need for efficient methods for snow removal while considering the impact on the transportation infrastructure of a city. Several proposals and approaches on modeling snow removal that heuristically deals with finding solutions to this wideopen problem have been studied and published in recent years. In this paper, we developed a new mathematical model that uses the Just-In-Time (JIT) method to optimize a transportation problem. The paperâ€™s main objective is to design a model for establishing efficient truck routes for snow removal by optimizing cost and time, which implicitly minimizes the impact on a cityâ€™s transportation infrastructure. We applied the network flow problem for snow removal to minimize time and cost of cleaning urban streets just in time. We ran several simulations of the models using the MATLABÂ®.
Double Integral Involving Logarithmic and Quotient Function with Powers Expressed in terms of the Lerch Function
Authors: Reynolds Robert , Stauffer Allan
Published: March 2022

In this work the authors use their contour integral method to derive the double integral given by $\int_{0}^{\infty}\int_{0}^{\infty}\frac{x^{m-1} y^{m+\frac{q}{2}-1} \log ^k(a x y)}{\left(x^q+1\right)^2 \left(y^q+1\right)^2}dxdy$ in terms of the Lerch function. This integral formula is then used to derive closed solutions in terms of fundamental constants and special functions. There are some useful results relating double integrals of certain kinds of functions to ordinary integrals for which we know no general reference. Thus a table of integral pairs is given for interested readers. All the results in this work are new.
On Eigenvectors of Nilpotent Lie Algebras of Linear Operators
Authors: Hirsch Morris W , Robbin Joel W.
Published: March 2022

We give a condition ensuring that the operators in a nilpotent Lie algebra of linear operators on a finite dimensional vector space have a common eigenvector.
A Descent Four-Term of Liu and Storey Conjugate Gradient Method for Large Scale Unconstrained Optimization Problems
Authors: Alhawarat Ahmad , Alolaiyan Hanan , Masmali Ibtisam A , Salleh Zabidin , Ismail Shahrina
Published: March 2022

The conjugate gradient (CG) method is a useful tool for obtaining the optimum point for unconstrained optimization problems since it does not require a second derivative or its approximations. Moreover, the conjugate gradient method can be applied in many fields such as machine learning, deep learning, neural network, and many others. This paper constructs a four-term conjugate gradient method that satisfies the descent property and convergence properties to obtain the stationary point. The new modification was constructed based on Liu and Storey's conjugate gradient method, two-term conjugate gradient method, and three-term conjugate gradient method. To analyze the efficiency and robustness, we used more than 150 optimization functions from the CUTEst library with different dimensions and shapes. The numerical results show that the new modification outperforms the recent conjugate gradient methods such as CG-Descent, Dai and Liao, and others in terms of number of functions evaluations, number of gradient evaluations, number of iterations, and CPU time.
Revisiting Domination, Hop Domination, and Global Hop Domination in Graphs
Authors: Salasalan Gemma Puebla , Canoy, Jr Sergio R
Published: March 2022

A set S âŠ† V (G) is a hop dominating set of G if for each v âˆˆ V (G) \ S, there exists w âˆˆ S such that dG(v, w) = 2. It is a global hop dominating set of G if it is a hop dominating set of both G and the complementÂ  of G. The minimum cardinality of a hop dominating (global hop dominating) set of G, denoted by Î³h(G)(resp.Î³gh(G)), is called the hop domination (resp. global hop domination) number of G. In this paper, we give some realization results involving domination, hop domination, and global hop domination parameters. Also, we give a rectification of a result found in a recent paper of the authors and use this to prove some results in this paper.Â Â
The Bivariate Extended Poisson Distribution of Type 1
Authors: Rufin Bidounda , Diafouka Michel Koukouatikissa , Miz Ìel Ìe  Kitoti R Ìeolie Foxie , Miz`ere Dominique
Published: March 2022

In this paper, we will construct the bivariate extended Poisson distribution whichgeneralizes the univariate extended Poisson distribution. This law will be obtained by the method of the product of its marginal laws by a factor. This method was demonstrated in [7]. Thus we call the bivariate extended Poisson distribution of type 1 the bivariate extended Poisson distribution obtained by the method of the product of its marginal distributions by a factor. We will show that this distribution belongs to the family of bivariate Poisson distributions and and will highlight the conditions relating to the independence of the marginal variables. A simulation study was realised.
A Note on the Infinite Sum of the Lerch function
Authors: Reynolds Robert , Stauffer Allan
Published: March 2022

We derive the infinite sum of the Lerch function in terms of the incomplete gamma function and the Lerch function. Special cases are evaluated in terms of fundamentals constants. All the results in this work are new.
Restrained Disjunctive Domination in Graphs under Some Binary Operations
Authors: Malalay Rolando Penafiel , Jamil Ferdinand Paler
Published: March 2022

A set S âŠ† V (G) is a disjunctive dominating set of a graph G if for every v âˆˆ V (G)\S, v is a neighbor of a vertex in S or S has at least two vertices each at distance 2 from v. We say that a disjunctive dominating set S of G is a restrained disjunctive dominating set if for each v âˆˆ V (G)\S there exists u âˆˆ V (G) \ S such that uv âˆˆ E(G) or there exist distinct vertices u, w âˆˆ V (G) \ S such that dG(u, v) = 2 = dG(w, v). The minimum cardinality Î³dr(G) of a restrained disjunctive dominating set of G is the restrained disjunctive domination number of G. In this paper, we characterize the restrained disjunctive dominating sets in some binary operations such as the join, corona and lexicographic product of graphs and, as a result, obtain the values of their corresponding restrained disjunctive domination numbers.