bluuebunny/crossref_metadata_2025 huggingface dataset:
The effects tailored interventions on cannabis use motives
Authors: Contreras Alejandra , Leadbeater Bonnie , Goulet-Stock Sybil
Published: March 2022

Background: The motives for cannabis affect on cannabis use and cannabis use consequences. Coping with stress is among the frequent motives for cannabis use. However, non stressed youth may use cannabis for self-enhancing motives like boosting confidence. Both motives are associated with higher frequency of cannabis use and more negative consequences (e.g., effects on schoolwork quality). Interventions targeting these distinctive motives may need to be tailored to assist youth trying to reduce cannabis use. The purposes of this study were: to examine the effect of cannabis use interventions on the change in motives of use; and whether motives for use are associated with hours per week using cannabis. Methods: Participants were from a cross national study including US and Canadian youth (n= 781). Participants included in the current analysis were from two Canadian Universities (n = 397, 54% female, median age = 21) were randomized into either the Cannabis eCHECKUP TO GO or Healthy Stress Management (HSM) intervention. Both interventions were administrated online and assessed at baseline and at a 4- to 6-week follow-up. Eligible youth reported using cannabis more than once a week and wanted to reduce their cannabis use. The 19 items to the question “what do you like about cannabis” were used as an assessment of motives for use (e.g., I feel more courageous, I feel more confident, cannabis helps me reduce stress, cannabis helps me sleep). Confirmatory Factor Analysis showed that a 2-factor model of cannabis use motives (self-confidence and stress-coping) fit the data adequately (CFI = 0.795, RMSEA [90% CI] = .063 [.057, .069]) after removing 2 poorly fitting items. Results: Across conditions self-confidence motives (T1: eCHECKUP condition M = 4.05(2.55), HSM condition M = 4.13(2.43); T2: eCHECKUP condition M = 4.09(2.50), HSM condition M = 4.36(2.28)) were endorse less than stress-coping motives (T1: eCHECKUP condition M = 6.48(1.92), HSM condition M = 6.25(1.78); T2: eCHECKUP condition M = 6.20(1.99), HSM condition M = 6.32(1.96)). Stress-coping motives were significantly correlated with the time spent high (hours a week) (T1 r= .21, T2: r=.26). A repeated measures MANOVA showed a significant interaction between time and intervention condition for the stress-coping motives only (F(1)= 4.08, p = .04). Participants in the Healthy Stress Management condition reported a significant decrease in the amount of stress-coping motives at the follow-up. Conclusions: These results demonstrate that motives of cannabis use can change over the course of a short online intervention for students seeking to reduce their use. In particular, the Healthy Stress Management condition helped participants reduce their stress-coping motives at T2. Neither intervention affected self confidence motives in the short term. These may be harder to address and may fuel continued use over time, even for youth hoping to change.
Elucidating the Nature of the Links Between Cannabis Use and Attention Deficit/Hyperactivity Disorder
Authors: Steuber Amanda , Cuttler Carrie
Published: March 2022

Many individuals with mental health disorders use cannabis to self-medicate for their symptoms. Attention-deficit/hyperactivity disorder (ADHD) is a neurological disorder associated with increased cannabis use but, relative to other mental disorders (e.g., anxiety, psychosis, post-traumatic stress disorder), far less attention has been paid to examining cannabis use by people with ADHD. Nevertheless, there is some limited evidence to suggest that people with ADHD might use cannabis to self-medicate for their symptoms and that they perceive it to be beneficial for this purpose. The goal of this study was to better understand the nature of the relationships between cannabis use and A total of 1,382 undergraduate students completed an online survey measuring their ADHD symptoms, and cannabis use patterns. Participants who reported they have used cannabis to manage their ADHD were further asked to report their perceptions of whether acute and/or chronic cannabis use improves, worsens, or has no effect on their ADHD symptoms. Participants who reported they have been prescribed ADHD medication and use cannabis also reported their perception of how cannabis use affects the effectiveness of their medication, and ADHD medication side effects. Evidence from this study revealed that ADHD symptom severity is associated with consuming cannabis more frequently and with more severe symptoms of cannabis use disorder. Participants with ADHD reported that cannabis has acute detrimental effects on memory but beneficial effects on many of their other core symptoms of ADHD, including hyperactivity, impulsivity, restlessness, and mental frustration. While most participants on ADHD medications reported that cannabis does not influence their medication effectiveness, they did report that cannabis helps with many of the side effects associated with their ADHD medications including headaches, loss of appetite, sleep disturbances, moodiness/irritability, and anxiety. The knowledge gained from this study will help people with ADHD and their healthcare providers by providing them with a better understanding of the use of cannabis by individuals with ADHD including the possible risks and benefits of such use on cannabis use disorder, ADHD symptoms, and medication side effects.
Mobile app detection of THC-related cognitive impairment in heavy users
Authors: Kirshenbaum Ari , Lewis Chris , Kaplan Andy
Published: March 2022

The degree to which frequent users of cannabis experience cognitive impairment from acute self-administration has been questioned on the basis of behavioral tolerance to THC. "Indicator" is a downloadable mobile software app that assesses cognitive, perceptual, and motor skills using a variety of brief videogames. In the course of one month (April 2021), the app was used by 199 adult users who self-identified as either use cannabis "frequently" or "continuously." Sixty-one of these heavy users played at least two of the videogames available in the app while sober, and this was on the first occasion of using the app. Ninety-six used the app while intoxicated by cannabis, and also on their first instance of using the app. Independent-samples t-test was performed to compare sober-versus-intoxicated performance on each of two separate videogames, and these videogames specifically assessed (a) time perception and (b) reaction speed and accuracy. Clear evidence of cannabis-related impairment was evident for both videogames (p < 0.05) for this heavy-using population. This evidence suggests that neurocognitive performance-related deficits are apparent in a population of users who are well-accustomed to the psychopharmacological influence of THC.
The relationship between anxiety status and cannabis use among OEF/OIF veterans: Somatization as a moderator
Authors: Tran Denise , Wang Jennifer , Fitzke Reagan , Davis Jordan , Pedersen Eric
Published: March 2022

American veterans are vulnerable to high rates of anxiety and substance use. Notably, veterans with mental health challenges report higher rates of cannabis use than those without mental health concerns. In the general population, anxiety often overlaps with a variety of somatic symptoms. However, less is known regarding the effects of both anxiety and somatization on cannabis use behaviors in veterans. Online surveys were completed by 1006 veterans (Mage=34.74, 75.1% male) with a three-month follow-up. Negative binomial regression was used to test whether baseline somatization moderated the relationship between baseline anxiety and frequency of past 30-day cannabis use three months later at follow-up. Compared to those who screened negative, those who screened positive for anxiety reported greater past 30-day cannabis use rates at follow-up (IRR=6.74; 95% CI [4.68, 9.71]). Higher levels of somatization also predicted greater past 30-day cannabis use rates (IRR=1.30; 95% CI [1.24, 1.36]). Somatization moderated the relationship between anxiety and past 30-day cannabis use frequency. At both low and high levels of somatization, those who screened positive for anxiety reported greater cannabis use days compared to those who screened negative for anxiety. However, among those who screened negative for a probable anxiety disorder, an increase in somatization is associated with an increase in past 30-day cannabis use frequency. Findings suggest that those who screen positive for anxiety and those who screen negative for anxiety, but endorse high levels of somatization, may likely benefit most from cannabis use prevention and/or intervention.
Cannabis Demand and Use among Veterans: A Prospective Examination
Authors: Aston Elizabeth , Meshesha Lidia , Stevens Angela , Borsari Brian , Metrik Jane
Published: March 2022

Background: Cannabis demand (i.e., relative value), assessed cross-sectionally via a hypothetical marijuana purchase task (MPT), has been associated with cannabis use, problems, and dependence symptoms, among others. However, neither the prospective stability of the MPT, nor the cyclical relationship between demand and use over time has been investigated. Moreover, cannabis demand among cannabis using veterans has yet to be examined. Method: Two waves of data from a veteran sample (N=133) reporting current (past 6-month) cannabis use were analyzed to assess stability and change in cannabis demand over six months. Autoregressive cross-lagged panel models assessed the longitudinal associations between demand indices (i.e., intensity, Omax, Pmax, breakpoint) and cannabis use. Results: Models revealed unique directions of effects for each demand index. Baseline cannabis use predicted greater intensity (ß = .32, p<.001), Omax (ß = .37, p<.001), breakpoint (ß = .28, p<.001), and Pmax (ß = .21, p = .017) at 6-months. Conversely, baseline intensity (ß = .14, p=.028), breakpoint (ß = .12, p=.038), and Pmax (ß = .12, p = .043), but not Omax, predicted greater use at 6-months. Discussion: Cannabis demand indices demonstrated prospective stability over six months and varied along with natural changes in cannabis use. Importantly, intensity, Pmax, and breakpoint displayed bidirectional predictive associations with cannabis use, and across indices, the prospective pathway from use to demand was consistently stronger. Findings highlight the value of assessing cannabis demand longitudinally, particularly among clinical samples, to determine how demand fluctuates in response to experimental manipulation, intervention, and treatment.
Marijuana Use Among Persons Living with Chronic Pain: A Qualitative Study
Authors: Joseph Verlin , Varma Deepthi , Chen Xinguang , Fillingim Roger , Wilkie Diana , Cook Robert
Published: March 2022

Chronic pain is presently the most expensive disease condition in the United States; with roughly 1 in 5 Americans currently reporting chronic pain. Traditionally, clinicians and patients have utilized prescription medications to manage chronic pain, however, attitudes towards standardized prescription treatment have waned due to a number of factors including the recent opioid epidemic. Consequently, attitudes towards marijuana use as an alternative pain therapy have continued to grow with 36 states approving use for medical purposes. Clinical trials have reported lower pain severity scores among participants receiving marijuana for pain compared to participants in the control arms. However, little is known regarding the psychological/physiological mechanisms by which marijuana provides relief for chronic pain. Research is also needed to identify how current marijuana users developed optimal patterns (i.e. dose, frequency, and quantity) of use for chronic pain. We sought to address these scientific gaps by conducting semi-structured interviews among community members. Participants (N=13) were eligible for participation if they reported having any pain during the previous 3 months and if they reported past 30-day marijuana use. The interviews lasted approximately 60 minutes following a semi-structured interview guide over Zoom telecommunications. Each interview was subsequently transcribed and then analyzed using Atlas T.I. A summary of each code was developed and key themes regarding marijuana use and pain were summarized. Multiple themes emerged including mechanism of pain relief (physical, mental, or both), patterns of marijuana use for pain relief, other benefits of marijuana use, comparisons to prescription drug use, descriptions of pain, and side effects of marijuana use. Our analysis identified several themes that add to the growing literature concerning marijuana use for chronic pain. These qualitative data indicate current marijuana users’ favorable opinions towards using marijuana as an alternative pain therapy. As legislation legalizing marijuana use for medicinal purposes continues to expand, qualitative studies are needed to examine the extent to which marijuana use is effective in managing pain.
Sex Moderates Associations Between Dimensions of Emotion Dysregulation and Problematic Cannabis Use
Authors: Cavalli Jessica , Cservenka Anita
Published: March 2022

Background. Research consistently finds that male cannabis users report greater problematic cannabis use (i.e., negative outcomes related to one’s cannabis use), compared to female cannabis users. Further, emotion dysregulation is a transdiagnostic risk factor for substance use and addiction and is associated with greater problematic cannabis use. Therefore, the current study examined whether sex moderates associations between emotion dysregulation (overall and dimensions of emotion dysregulation) and problematic cannabis use. Methods. 741 adults reporting past-month cannabis use (31.44% female) completed an online anonymous survey, including questions on demographics, substance use, problematic cannabis use (via the Marijuana Problem Scale) and emotion dysregulation (via the Difficulties in Emotion Regulation Scale). Independent samples t-tests and hierarchical multiple linear regressions were performed. Results. Male cannabis users reported significantly higher scores on overall emotion dysregulation and five of six dimensions (nonacceptance, impulse, awareness, strategies, and clarity) compared to female cannabis users. Further, sex moderated associations between emotion dysregulation (overall, nonacceptance, goals, impulse, awareness, and strategies) and problematic cannabis use. Overall, nonacceptance, goals, impulse, and strategies were positively associated with problematic cannabis use, and these relationships were stronger in male cannabis users. Lack of emotional awareness was negatively associated with problematic cannabis use in male cannabis users and no relationship was found for female cannabis users. Conclusions. Overall, these results denote the importance of examining individual differences in emotion dysregulation as they relate to problematic cannabis use. Interventions and treatments may need to be tailored for male cannabis users with a focus on specific emotion dysregulation dimensions.
Military sexual violence and cannabis use disorder among OEF/OIF veterans
Authors: Fitzke Reagan , Lee Daniel , Tran Denise , Davis Jordan , Pedersen Eric
Published: March 2022

Sexual violence experienced during military service can have lasting negative psychosocial effects on veterans long after service ends. Current research reports veterans who have experienced military sexual violence are more likely to develop mental health and substance use disorders. Little is known, though, about the relationship between military sexual violence and subsequent cannabis use disorder (CUD). The current study investigated prevalence of military sexual violence among a large sample of OEF/OIF veterans (N = 1,005), its effect on later CUD, and the potential moderating role of resilience. First, t-tests examined differences in experience of military sexual violence between LGBQ vs. heterosexual and female vs. male veterans. Then, using logistic regressions controlling for sex, sexual orientation, and race/ethnicity, we assessed the effects of sexual violence on CUD (Cannabis Use Disorder Identification Test score of 12 or higher), followed by adding resilience into the model to examine independent and moderation effects. T-test results indicated that female (t(99) = -7.46, p < 0.001) and LGBQ veterans (t(38) = -3.85, p < 0.001) were significantly more likely to experience military sexual violence. Veterans who experienced military sexual violence had higher odds of screening for CUD (OR = 3.37; 95% CI = [1.76, 6.45]). Greater resilience was associated with lower odds of CUD (OR = 0.40; 95% CI = [0.23, 0.70]), but it did not moderate the relationship between sexual violence and CUD. Our findings are in line with prior work that female and LGBQ veterans may experience sexual violence during military service at higher rates. We also showed that veterans who experience military sexual violence are at increased risk for subsequent CUD. This suggests the importance of screening for military sexual violence among veterans, including among those seeking care for CUD, as well as screening for CUD symptoms among those who have experienced military sexual violence. Since we found that greater levels of resilience were associated with lower odds of CUD, programs and treatments aimed at building resilience to adverse events may have independent protective effects on CUD.
Exploring sensation-seeking and first cannabis use experiences as correlates of current cannabis use problems in young adult cannabis and tobacco co-users.
Authors: Wyatt Riley , Cohn Amy , Ehlke Sarah
Published: March 2022

Introduction: Current cannabis use is high in young adults (ages 18-24) and cannabis use disorder (CUD) rates have increased over the last decade. Subjective responses to one’s first use of cannabis may explain continued use, wherein more positive first use experiences influence progression to regular and problematic use. Sensation seeking is associated with cannabis use and may also influence cannabis problem severity. This study examined the relationship between subjective experiences at first cannabis use and sensation seeking on cannabis use behavior and CUD diagnosis. Method: Participants were 97 young adult current cannabis and tobacco co- users (55.7% male, 50.5% White) who completed the baseline survey of a longitudinal study examining daily patterns of tobacco and cannabis use and co-use. Participants completed the 4-item Brief Sensation Seeking Scale and indicated intensity of 15 sensations at first cannabis use (1 = not at all to 5 = intense): dizziness, lightheadedness, nausea, paranoia, confusion, happiness, anxiety, taste, smell, relaxation, energy, difficulty inhaling, coughing or choking, giddiness or laughter, and rush or “buzz.” Cannabis use outcomes included: (1) past 30-day number of days used cannabis; (2) past 30-day cannabis intoxication intensity (1 = not at all high to 10 = extremely high); and (3) likelihood of a CUD (score ≥ 12 on the Cannabis Use Disorder Identification Test- Revised). Analyses: A principal components analysis (PCA) reduced the 15 sensations into factors. Next, separate regression analyses (linear or binary logistic) were conducted to examine the associations of the PCA-derived factors and sensation seeking on the cannabis outcomes, controlling for gender, race, and age at first cannabis use. Results: Over half (61.9%) of the participants met criteria for a CUD. PCA results indicated a 4-factor solution: (1) “positive emotional experiences” (e.g., happy); (2) “negative physical experiences” (e.g., dizzy); (3) “negative emotional experiences” (e.g., paranoia); and (4) “taste and smell.” Regression results indicated greater negative physical experiences were associated with an increased likelihood of a CUD diagnosis (AOR = 1.93, p = .038) and lower average cannabis intoxication (b = -0.343, p = .049). Greater negative emotional experiences at first use were associated with less frequent cannabis use in the past 30 days (b = -2.043, p = .028). Conclusion: Negative emotional experiences associated with first use of cannabis may impede continued use. Negative physical experiences (e.g. nausea, lightheadedness) may be variable in perception, which could explain the inconsistent associations of this factor with CUD diagnosis and past 30-day use. Understanding subjective experiences of first cannabis use could be used as a treatment target by helping patients identify reinforcing sensations associated with their use, and guiding them to sober activities with similar sensations.
Analisa Kegagalan Bantalan Luncur (Bush) pada Poros Sepatu Rem Kereta Api
Authors: Putra Adi Ganda , Pawawoi Pawawoi
Published: March 2022

Bantalan Luncur (Bush) pada poros sepatu rem kereta api berfungsi membantu proses pengereman yang terjadi pada kereta api yang akan berhenti. Kegagalan bantalan luncur dalam membantu proses pengereman yang terjadi pada kereta api akan mengakibatkan kereta bisa tergelincir atau yang lebih fatal akan mengakibatkan terjadinya kecelakaan. Kerusakan pada bantalan luncur ini terjadi karena adanya konsentrasi tegangan sehingga tegangan yang diterima melebihi kekuatan dari bantalan luncur. Akibatnya bantalan luncur mengalami patah. Tegangan yang terjadi akibat adanya konsentrasi tegangan sebesar 21,32 kgf/mm2 sedangkan tegangan yang diijinkan adalah 16,4 kgf/mm2 . Perbedaan yang besar ini menyebabkan terjadinya deformasi dan patah pada bantalan luncur. bentuk patahan yang terjadi berupa patah transgranular. Sehingga pada material bush yaitu patah transgranular .
Model Belajar Teknologi
Authors: Sast Jahny
Published: March 2022

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Pengaruh Pengaku Konsentris (Concentric Bracing) dan Eksentris (Eccentric Bracing) pada Struktur Baja dengan Daktilitas PenuhTerhadap Gempa
Authors: Sumargo  , Basri Syamsul , Rosyidah Anis
Published: March 2022

Tujuan dari penulisan ini adalah untuk mengetahui perbedaan perilaku struktur baja berpengaku konsentris dan eksentris apabila diberi percepatan gempa El Centro dan Pasadena. Perilaku yang ditinjau meliputi periode getar, simpangan, histeresis loop, daktilitas struktur dan elemen.

Model struktur adalah portal baja 12 lantai menggunakan pengaku konsentris tipe diagonal (Al) dan inverted V (A2), untuk pengaku eksentris tipe diagonal (B1) serta inverted V (B2). Alat bantu untuk analisis menggunakan software SAP 2000 dan excel. Adapun metode penyelesaiannya meliputi perencanaan struktur dan analisis perilaku struktur.

Dari perencanaan didapat ukuran profil sama pada ke-empat struktur. Pada hasil analisis diperoleh periode getar alami terbesar pada struktur B1- 0,423 detik dan terkecil adalah struktur A2 â€” 0,362 detik. Hasil simpangan terbesar akibat percepatan gempa El Centro maupun Pasadena terjadi pada struktur B2. Akibat gempa El Centro dan Pasadena pada ke- empat struktur masih bersifat elastis sehingga nilai daktilitas struktur () â€” 1, begitu pula dengan daktilitas elemen, belum terjadi sendi plastis.
Evaluasi Metode Estimasi Viskositas Kinematik Campuran Biner Base Oil dan Aditif Viscosity Modifiers (VMs)
Authors: Widodo Setyo , Saksono Nelson Saksono , Subiyanto Subiyanto
Published: March 2022

Penyusunan formula minyak lumas selalu melibatkan pencampuran base oil dan aditif melaluitahapan estimasi dan formulasi skala laboratorium, dilanjutkan dengan produksi skala komersial.Parameter kunci dalam penyusunan formula adalah viskositas kinematik yang nilainya dapatdihitung secara teoretis dan pengujian laboratorium. Beberapa metode estimasi viskositas campuranyang dikenal antara lain persamaan Refutas, metode Wright, dan metode yang dikembangkandan digunakan dalam American Society for Testing and Material (ASTM D 7152).Penelitian ini dilakukan untuk mempelajari akurasi ketiga metode tersebut dalam memprediksiviskositas kinematik campuran biner base oil dan aditif. Sampel campuran biner tersusun daridua jenis base oil mineral produksi PT Pertamina (Persero) dan aditif viscosity modifiers (VMs)produksi Lubrizol yang divariasikan pada kisaran konsentrasi 5-30 % berat. Nilai viskositaskinematik diukur pada temperatur uji 40 dan 100oC menggunakan cannon automatic viscometerseries 2000 (CAV 2000) dengan mengacu pada metode uji ASTM D 445. Evaluasi data dilakukanuntuk mendapatkan nilai persen average absolute deviation (%AAD) sebagai indikator akurasihasil estimasi dari setiap metode dibandingkan dengan data empiris.Hasil penelitian menunjukkan bahwa nilai %AAD pada 24 data uji dari 12 sampel campuranbiner dan temperatur uji 40oC adalah 10,56 %, lebih rendah dibandingkan persamaan Refutas danmetode ASTM, yaitu 41,19 dan 41,25 %. Pada temperatur uji 100oC nilai %AAD metode Wrightadalah 15,03 %, lebih rendah daripada persamaan Refutas dan metode ASTM yaitu 39,15 dan39,43 %. Berdasarkan hasil tersebut, dapat disimpulkan bahwa metode Wright memberikan nilaiestimasi yang lebih akurat dibandingkan dengan persamaan Refutas maupun metode ASTM.
Pemanfaatan Bakteri Thiobacillus Thioparus Untuk Mereduksi Kandungan Sulfur dalam Gas
Authors: Syafrizal Syafrizal , Dianursanti Dianursanti
Published: March 2022

Salah satu solusi untuk mereduksi kandungan sulfur menggunakan mikroba yang bersifataerob. Jenis mikroba ini dapat mengoksidasi senyawa sulfur untuk menghasilkan energi. Bakterisulfur dapat menyimpan dan menggunakan sulfur elemental atau komponen organik sulfur untukmetabolisme selnya.Dalam penelitian ini bakteri pereduksi sulfur yang digunakan adalah Thiobacillus thioparus,sedangkan senyawa sulfur yang digunakan natrium tiosulfat (Na2S203) dengan konsentrasi 200,400, dan 600 mg/L.Hasil penelitian menunjukkan, tingkat ketahanan bakteri Thiobacillus thioparus terhadap variasikonsentrasi senyawa sulfur secara umum mengalami fase lag pada 12 jam periode inkubasi. Faseeksponensial terjadi pada periode ini, pertumbuhan bakteri yang sangat cepat selama 30 atau 36jam dan mengalami penurunan populasi pada jam ke-54. Pada tiga perlakuan tersebut semakintinggi konsentrasi substrat, maka aktivitas bakteri dalam laju reduksi akan semakin besar.
Pemilihan Umpan Kilang Berdasarkan Pendekatan Jenis Minyak Bumi dan Perolehan Distilasi
Authors: Rahman Maizar , Away Yuflinawati , Hotimah Baity , Adiwar Adiwar
Published: March 2022

Lemigas sebagai Litbang lewat program Evaluasi Mutu Minyak Bumi telah menginventarisasijenis dan karakter minyak bumi Indonesia. Data jenis dan karakter minyak bumi Indonesia initelah disajikan dalam Buku Minyak Bumi Indonesia edisi 1 sampai 4 dan Pangkalan Data MinyakBumi Indonesia versi 1 sampai 3. Beberapa program atau pendekatan seperti Crude Oil Blendingdan Crude Oil Grading telah disusun untuk memanfaatkan data jenis dan karakter minyak bumiIndonesia tersebut. Dalam makalah ini dikemukakan suatu cara pemilihan minyak bumi substitusiumpan kilang sebagai pengganti minyak bumi umpan disain kilang. Cara pemilihan ini dilakukanlewat pendekatan jenis minyak bumi dan perolehan distilasi. Pendekatan lewat jenis minyak bumidilakukan untuk mendapatkan sifat produk minyak bumi yang dihasilkan sama atau lebih baikdari sifat produk yang dihasilkan umpan disain kilang. Pendekatan lewat yield distilasi dilakukanuntuk mendapatkan perolehan produk bumi yang dihasilkan sama atau mendekati perolehan produkyang dihasilkan umpan disain kilang. Pemilihan minyak bumi baik dalam bentuk individual ataudalam bentuk blending sebagai pengganti minyak bumi Katapa dari sejumlah minyak bumi, yangdikemukakan dalam makalah ini sebagai contoh kasus menghasilkan dua minyak bumi individualdan satu minyak bumi blending yang dapat dipakai sebagai pengganti minyak bumi Katapa.
New Topologies between the Usual Topology and the Half-disc
Authors: Alghamdi Nadiah , Kalantan Lutfi Nooruddin
Published: March 2022

We generate new topologies on the closed upper half plane which lie between the usual topology and the half-disc topology. We study some of their fundamental properties and weaker versions of normality.
On the Fourier Transform Related to the Diamond Klein - Gordon Kernel
Authors: Bupasiri Sudprathai
Published: March 2022

In this article, we study the fundamental solution of the operator $$\left((\diamond+m^2)\left(\frac{\triangle^2+\boxdot^2}{2}\right)\right)^{k}$$, iterated $k$-times and is defined by (\ref{odot}),where $m$ is a nonnegative real number, and $k$ is a nonnegative integer. After that, we study the Fourier transform of the operator $ \left((\diamond+m^2)\left(\frac{\triangle^2+\boxdot^2}{2}\right)\right)^{k}\delta$.
New Spline Method for Solving Linear Two-Point Boundary Value Problems
Authors: Heilat Ahmed Salem , Zureigat Hamzeh , Hatamleh Raâ€™ed , Batiha Belal
Published: March 2022

In this research, second order linear two-point boundary value problems are treated using new method based on hybrid cubic B-spline. The values of the free parameter,Gamma , are chosen via optimization. The value of the free parameter plays an important role in giving accurate results. Optimization of this parameter is carried out. This method is tested on four examples and a comparison with cubic B-spline, trigonometric cubic B-spline and extended cubic B-spline methods has been carried out. The examples suggest that this method produces more accurate results than the other three methods. The numerical results are presented to illustrate the efficiency of our method.
Quadruple g-best Proximity Point for New Contraction in Complete Metric Space
Authors: Rathee Savita , Swami Monika
Published: March 2022

The aim of this manuscript is to propose a contraction to pursue the existence of quadruple best proximity point results. The finding of this manuscript generalize and unify the results of Rohen and Mlaiki by using the new contraction with P-property and prove the existence and uniqueness of quadruple best proximity point along with an example.
Boundedness of Nonregular Pseudo-differential Operators on Variable Exponent Triebel-Lizorkin-Morrey Spaces
Authors: Congo Mohamed , Ouedraogo Marie Francoise
Published: March 2022

In this paper, we study the boundedness of non regular pseudo-differential operators on variable exponent Besov-Morrey spaces E s(Â·) p(Â·),u(Â·),q(Â·) with symbols a(x, Î¾) belonging to C â„“ âˆ—S m 1,Î´. For these symbols x-regularity is measured in HÂ¨older-Zygmund spaces.
On Ï†-Î²-Absorbing Submodules
Authors: Khumprapussorn Thawatchai
Published: March 2022

In this paper, we extend the concept of Î²-absorbing submodules to Ï†-Î²-absorbingsubmodules over a commutative ring with nonzero identity which is a generalization of 2-absorbing submodules. Let S(M) be the set of all submodules of M and Ï† : S(M) â†’ S(M)âˆª{âˆ…} be a function. A proper submodule P of M is called a Ï†-Î²-absorbing submodule, if for each r, s âˆˆ R and m âˆˆ M with rsm âˆˆ P\Ï†(P), then rs + rs âˆˆ (P : M) or r(m + m) âˆˆ P or s(m + m) âˆˆ P. Some of the properties and characterizations of Ï†-Î²-absorbing submodules are investigated.
COMPARATIVE ANALYTICAL DETERMINATION OF THERMAL PROTECTION BEHAVIOR FOR EXPERIMENTAL MODELS MADE OF STRATIFIED BIOCOMPOSITE BOARDS OF LIGNO-CELLULOSE NATURE
Authors: NITU SILVIA - ANDREEA , IATAN RADU I. , DURBACA ION , PETROSEL GABRIEL , SURDU ELENA , FARCAS - FLAMAROPOL DANA CLAUDIA
Published: March 2022

The paper addresses the comparative analytical determination of thermal insulation behavior for various experimental models made of stratified and hybrid biocomposites of ligno-cellulose nature. The analytical determination of the thermal resistance and the overall thermal insulation coefficient for each experimental model is performed using the calculation methodology for energy efficiency. The results obtained after the analysis of the thermal insulation behavior for the biocomposite panels highlighted the fact that they have thermal insulation properties with high values for thermal resistance and global thermal insulation coefficients.
DESIGN ANALYSIS OF AN AUTOMATIC PHASE SELECTOR
Authors: OWOJORI ADEDOTUN O. , AKINBOLADE ABIODUN M. , AKINGBADE KAYODE F.
Published: March 2022

Power instability in Nigeria caused by overbearing demand of power by consumers and lack of proper maintenance of the power system devices among others has brought about the need for alternative power sources such as generators, solar, typical inverters and other alternative supplies which requires one form of switching or the other to achieve phase selection during power failure. This paper gives a design analysis of an automatic phase selector linking available power supplies, that is; switching between a three-phase public utility supply, as a result of total power outage in the public supply to an alternative secondary supply (in this case a Generator and an Inverter system) and back when power is restored. The design adopts the use of a microcontroller-based system interconnected with other hardware components for proper isolation, switching and visualization of switching conditions. The system design is divided into two major part: the hardware which consists of the power supply, sensing circuit, controller or control logic circuit, display and the power electronics switching unit and the software instruction code on the microcontroller unit. The design analysis was first carried out accompanied with computer simulation on a software tool (Proteus 8 Professional, version 8.4) to carry out performance evaluation of the sub-circuits, thereafter, a practical implementation of the design was carried out and tested with the utility power supply using five (5) switches, three of which represents the three-phase primary supply and the other two represents the secondary supply.
ASPECTS REGARDING THE CUTTING CAPACITY OF DIAMOND DISCS USED IN THE FLAT GRINDING OF HARD GRANITE AND BASALT MINERAL MATERIALS
Authors: VALEA PETRE
Published: March 2022

The paper presents how to determine the partial and global cutting capacity (CC) based on technological evaluation criteria (sustainability, specific energy consumption, cutting forces, roughness) and technical economic criteria (grinding productivity and cost). The theoretical-experimental model that allows the determination of the global CC for diamond discs takes into account the specific features of these super abrasive tools and the cutting process for flat grinding of hard mineral materials granite and basalt. Also, are presented the characteristics of diamond discs, the experimental stand and the factorial plans used in the experimental part.
UTILIZATION OF POLYPROPYLENE IN BITUMINOUS CONCRETE
Authors: CHUKWUKA EZEMENIKE , ISIAKA OLADELE , OLUFIKAYO ADERINLEWO , OLUGBENGA OYEDEPO
Published: March 2022

The utilization of polypropylene in form of waste plastic to produce bituminous concrete for pavement construction was studied. The aggregates, bitumen and polypropylene were characterized. Bitumen was partially replaced with polypropylene at 2, 4, 6 and 8% by weight to produce asphalt concrete, thereafter, Marshal Stability and flow test was carried out on asphalt concrete. From the result, Marshal Stability values of 8.77, 9.18, 9.5 and 11.51 KN while flow values of 3.5, 3.2, 3.1 and 2.8 mm were respectively obtained. This study suggests that the polypropylene could enhance the performance of asphalt concrete and decrease the cost of road construction.
ERGONOMICS AND FUNCTIONAL REQUIREMENT IN THE DESIGN OF STUDENTS’ FURNITURE IN MOSHOOD ABIOLA POLYTECHNIC ABEOKUTA NIGERIA
Authors: MUSA-OLOKUTA ADEKUNLE IBRAHIM
Published: March 2022

A total of five hundred and fifty students were randomly selected in three schools of engineering; communication; science and technology. The existing furniture dimensions were measured. The maximum and minimum table height was determined. The results showed seat heights as compared with the students body sizes are expected to be in the range of 33.85 cm and 36.54 cm. Table height is expected to be in the range of 61.08 cm and 64.48 cm. The study concluded that data on the anthropometric dimension of students are provided and this could be used as database for the planning of future furniture in the lecture rooms.
Pengaruh Solvabilitas dan Profitabilitas terhadap Penghindaran Pajak
Authors: Wanda Adi Putra , Halimatusadiah Elly
Published: March 2022

Abstract. Tax storage is an effort to reduce the tax burden carried out by taxpayers in the scope of the tax laws carried out by utilizing weaknesses in tax laws and regulations to reduce the amount of tax debt. This study aims to determine the effect of the solvency and profitability of tax avoidance. Solvability is measured using a Debt To Asset Ratio (DAR). Profitability is measured using ROA (Returns On Assets). Tax avoidance is measured using CETR (Cash Effective Tax Rates). This research uses secondary data. The research method used in this study was descriptive with a quantitative approach. The population in this study is a manufacturing company from the industrial sector of consumer goods listed on the Indonesia Stock Exchange (IDX) for 4 periods, namely 2016-2019. The sample of this study used a purposive sampling method so that 21 sample companies were obtained. The hypothesis testing used in this study uses multiple regression analysis. The hypothesis test results show that solvency has a positive effect on tax avoidance, and profitability has a negative effect on tax avoidance. For further research purposes, it is recommended to use other factors considered to affect tax avoidance, such as company size, capital intensity,etc.

Abstrak. Penghindaran Pajak adalah usaha untuk meminimalkan beban pajak yang dilakukan oleh wajib pajak pada batas cakupan ketetapan perundang-undangan perpajakan yang dilaksanakan dengan menggunakan beberapa kelemahan pada undang-undang serta peraturan perpajakan guna mengurangi total pajak yang terutang. Penelitian ini tujuannya untuk memahami pengaruh solvabilitas dan profitabilitas pada penghindaran pajak. Solvabilitas diukur dengan memakai DAR (Debt To Asset Ratio). Pengukuran Profitabilitas dengan memanfaatkan ROA (Return On Asset). Pengukuran Penghindaran Pajak dengan memanfaatkan Cash Effective Tax Rate. Penelitian ini memanfaatkan data sekunder. Metode penelitian yang dipergunakan pada penelitian ialah metode kuantitatif dan deskriptif. Objek penelitian ini yaitu perusahaan manufaktur di industri barang konsumsi yang tercatat di BEI selama 4 tahun yaitu 2016-2019. Sampel dalam penelitian ini menerapkan metode purposive sampling untuk mendapatkan sampel dari 21 perusahaan. Uji hipotesis yang dipergunakan pada penelitian ini memakai analisis regresi berganda. Hasil uji hipotesis membuktikan bahwa solvabilitas memberi pengaruh positif pada penghindaran pajak, serta profitabilitas memberi pengaruh negatif pada penghindaran pajak. Diberi saran agar mempelajari lebih lanjut dan memakai beberapa faktor lain yang dianggap memberi pengaruh pada penghindaran pajak, seperti intensitas modal dan ukuran perusahaan.
Tinjauan Etika Bisnis Islam pada Sanksi Blacklist terhadap Konsumen
Authors: Nia Wulansari  , Titin Suprihatin  , Nanik Eprianti
Published: March 2022

Abstract. A businessman must apply the principles of truth by reflecting a spirit of generosity, a good motive for service, and an attitude toward god's begetting. From principles of righteousness a business automatically gives birth to brotherhood. Business is in the online shop Quenney.id carries a penalty for the consumer which is blacklist sanctions. The purpose of this study is to find a review of the Islamic business ethics regarding the application of blacklist sanctions mechanisms for online shop Queneey.id. These research methods are qualitative. The result of this study is the blacklist sanctioned mechanism given not on the basis of the damage but only for the benefit of the online shop. Which has left consumers unable to communicate and communicate again. This is not in accordance with the ethical principles indicator of the Islamic business's loose generosity and the building of good relations and the ethical concept of the Islamic business. This led to the failure of ethics toward consumers And consumer rights are unfulfilled.

Abstrak. Seorang pembisnis harus menerapkan prinsip kebenaran dengan mencerminkan sikap kemurahan hati, motif pelayanan yang baik, dan sikap akan adanya Allah SWT. Bisnis dalam Online Shop Queneey.id menerapkan sanksi bagi konsumen yaitu sanksi blacklist. Tujuan dari penelitian ini untuk mengetahui tinjauan Etika Bisnis Islam terhadap mekanisme penerapan sanksi blacklist (daftar hitam) terhadap konsumen pada online shop Queeney.id. Metode penelitian ini adalah kualitatif. Hasil dari penelitian ini adalah mekanisme pemberian sanksi blacklist ini diberikan tidak atas dasar adanya kerugian melainkan hanya untuk kepentingan online shop. Yang mengakibatkan konsumen tidak dapat bertranskasi dan berkomunikasi lagi. Hal ini tidak sesuai dengan indikator prinsip etika bisnis Islam longgar bermurah hati dan membangun hubungan baik serta konsep etika bisnis Islam. Hal ini mengakibatkan etika kepada konsumen tidak terlaksana dan hak konsumen tidak terpenuhi .
Analisis Akad Jual-beli Kain Gulungan dalam Penggunaan Hak Khiyar Menurut Fikih Muamalah
Authors: Indriyani  , Yunus Muhammad , Hadiyanto Redi
Published: March 2022

Abstract. This thesis uses the results of (field research) related to "Analysis of the Sale and Purchase Agreement of Rolled Fabrics in the Use of Khiyar Rights According to Fiqh Muamalah (Case Study at Z Market)".This thesis research aims: (1) To find out the concept of khiyar in buying and selling according to muamalah fiqh (2) To find out the practice of khiyar in buying and selling rolled cloth at the Z market (3) To find out an overview of fiqh muamalah the practice of khiyar in buying and selling rolled cloth at Z Market. The method used in this study is a qualitative research method in the field of normative law, namely examining the arguments of the Qur'an and Hadith as well as the opinions of scholars related to khiyar rights in the contract of buying and selling cloth rolls at the Z Market based on primary and secondary data. secondary data obtained from the field. The results of this study indicate that the use of khiyar rights in the sale and purchase of rolled cloth at the Z Market fulfills the pillars and conditions of sale and purchase. Merchants apply a bargaining system and allow the exchange of goods if the discrepancy meets the conditions agreed upon by the seller and the buyer. However, in buying and selling, the seller should guarantee the buyer to khiyar so as not to feel disadvantaged. The sale and purchase transaction between the parties should do justice by bearing the profits and losses so that the benefit in buying and selling can be achieved.

Abstrak. Skripsi ini menggunakan hasil penelitian lapangan (field research) berkaitan dengan “Analisis Akad Jual-beli Kain Gulungan Dalam Penggunaan Hak Khiyar Menurut Fikih Muamalah (Studi Kasus di Pasar Z)”. Penelitian skripsi ini bertujuan: (1) Untuk mengetahui konsep khiyar dalam jual-beli menurut fikih muamalah (2) Untuk mengetahui praktik khiyar dalam jual-beli kain gulungan di pasar Z (3) Untuk mengetahui tinjauan fikih muamalah praktik khiyar dalam jual-beli kain gulungan di Pasar Z. Metode yang digunakan penelitian ini adalah metode penelitian kualitatif dalam bidang ilmu hukum normatif, yaitu mengkaji dalil-dalil al-Qur’an dan Hadits serta pendapat ulama yang terkait hak khiyar dalam akad jual-beli kain gulungan di Pasar Z  berdasarkan data primer dan sekunder yang didapatkan dari lapangan. Hasil penelitian ini menunjukkan bahwa penggunaan hak khiyar dalam jual-beli kain gulungan di Pasar Balubr Town Square memenuhi rukun dan syarat jual-beli. Pedagang menerapkan sistem tawar-menawar dan memperbolehkan penukaran barang apabila ketidaksesuaian tersebut memenuhi syarat yang telah disepakati penjual dan pembeli. Namun, dalam melakukan jual-beli hendaknya penjual menjamin pembeli untuk khiyar agar tidak merasa dirugikan. Hendaknya, transaksi jual-beli diantara para pihak melakukan keadilan dengan menangggung keuntungan maupun kerugian agar kemashlahatan dalam jual-beli dapat tercapai.
Tinjauan Akad Ijarah terhadap Wanprestasi Sewa Menyewa Indekost pada Masa Pandemi Covid-19
Authors: Avrillia Wulandari Putri Supriyadi  , Ifa Hanifah Senjiati  , Arif Rijal Anshori
Published: March 2022

Abstract. Ijarah contract is a contract of transfer of usufructuary rights over an item or service through payment of rental wages, without being followed by a transfer of ownership of the goods themselves. One example of an ijarah contract is renting a boarding house, but in its implementation there are unexpected problems that result in termination or cancellation of the agreement. This study aims to find out how the ijarah contract reviews will be rented out in boarding houses in Jayaraga Village, Tarogong Kidul District, Garut Regency during the Covid 19 Pandemic.The research method used is field research with descriptive qualitative research and the sample in this study is the boarding house room located in Jayaraga Village, Tarogong Kidul District, Garut Regency. The data sources used are primary data and secondary data. Data collection techniques used are interviews, direct observation and documentation. The results of the study show that if the ijarah agreement is carried out in renting a boarding house room, it has fulfilled the pillars and conditions of the Ijarah contract, and violations that occur in the ijarah contract must be resolved by both parties without harming either party.

Abstrak. Akad ijarah merupakan akad pemindahan hak guna atas suatu barang atau jasa melalui pembayaran upah sewa, tanpa diikuti dengan pemindahan kepemilikan atas barang itu sendiri. Salah satu contoh dari akad ijarah adalah sewa menyewa kamar indekos, akan tetapi dalam pelaksanaaannya terdapat permasalahan diluar dugaan yang mengakibatkan adanya pemutusan atau pembatalan perjanjian. Penelitian ini bertujuan untuk mengetahui bagaimana tinjauan akad ijarah terhadap akan sewa-menyewa kamar indekos di Desa Jayaraga Kecamatan Tarogong Kidul Kabupaten Garut pada saat masa Pandemi Covid 19.  Metode penelitian yang digunakan adalah penelitian lapangan dengan jenis penelitian kualitatif deskriptif dan sampel dalam penelitian ini yaitu kamar Indekos yang berada di Desa Jayaraga Kecamatan Tarogong Kidul Kabupaten Garut. Sumber data yang dugunakan merupakan data primer dan data sekunder. Teknik pengumpulan data yang digunakan adalah wawancara, observasi langsung dan dokumnetasi. Hasil penelitian menunjukan jika Akad ijarah yang dilakukan dalam sewa menyewa kamar indekos sudah memenuhi rukun dan syarat Akad Ijarah, dan pelanggaran yang terjadi dalam akad ijarah harus diselesaikan oleh kedua belah pihak tanpa merugikan salah satu pihak.