bluuebunny/crossref_metadata_2025_split huggingface dataset:
Group Integration Method in Integral Calculus at the College of Engineering University of Eastern Philippines
Authors: Jr. Eladio B. Jao , Varela Benjamin D. 
Published: February 2021

This study intended to determine the effect of Group Integration Method on academic performance in Integral Calculus at the College of Engineering University of Eastern Philippines.
It employed a quasi-experimental design that involved two sections of second year BSEE students enrolled in Integral Calculus in the College of Engineering. The students in these sections were comparable since their pre-test on a 1-1 scoring system were not significantly different using the t-test of independent sample at 0.05 level of significance in Integral Calculus ability of the students between the control and experimental group.
The average pre-test scores per class were determined to set the experimental and control group. The former bears the lower average scores, which needs more attention through cooperative learning among group members while the latter bears the higher ones since the students can handle individual learning. The individual pre-test scores were used in the categorization of the students in both control and experimental groups. The scores were ranked and categorized into three (3): the High Performer (HP), the Average Performer (AP) and the low Performer (LP).
The result showed that most of the respondents for both groups are males, first timers and average students with respect to differential calculus academic performance. As to the age bracket, the data shows majority of the students were (18-20) years old.
The outcomes of the study further showed that the respondents exposed to the Integration Method and Traditional Method had the overall interpretation of failed rating at the start of the study. As the study progressed 8 respondents from the Group Integration and 12 respondents were added in Traditional method above failing stage considering the post-test administered to both groups.
The T-test at 0.05 level of significance stressed out that post-test and combined tests for pre-test/post-test significantly differs for both Group Integration and Traditional methods of instruction.
Finally, as to the academic performance, Group Integration is better than Traditional Methods of Instruction. This implies that the intervention aided the students to boost their skills in Integral calculus under the experimental group.
Bodi Mobil dengan Komposit Matriks Fiber Carbon-Honeycome dan Penguat Resin Lycal
Authors: Respati Sri Mulyo Bondan , Katsir Ibnu , Dzulfikar Muhammad 
Published: February 2021

Body mobil KMHE yang dilombakan oleh kemendikbud tahunan, kebanyakan menggunakan rangka aluminium. Penelitian ini mengajukan bahan carbon fiber-honeycomb sebagai pengganti rangka aluminium. Dalam penelitian metode yang digunakan adalah melapisi honeycomb dengan lapisan carbon fiber-resin. Cara pelapisan bagian dari 1 sampai 3 lapisan pembuatan material menggunakan hand lay-up. Standar specimen yang digunakan adalah ASTM D 638-02 dan ASTM D 790 – 02. Hasil penelitian ini menunjukan bahwa berturut-turut kekuatan tarik dan bending tertinggi di dapat pada 3 lapisan atas komposit karbon fiber-honeycomb 3449,49 kg/mm2 dan untuk pengunjian bending 203,65 kg/mm2. Jika dibandingkan dengan aluminium maka bahan ini dapat digunakan sebagai body mobil KMHE
Pauson‐Khand Reactions with Concomitant C−O Bond Cleavage for the Preparation of 5,5‐ 5,6‐ and 5,7‐Bicyclic Ring Systems
Authors: Ma Ding , Hu Naifeng , Ao Junli , Zang Shaoli , Yu Guo , Liang Guangxin 
Published: February 2021

AbstractPauson‐Khand reactions (PKR) with concomitant C−O bond cleavage have been developed for construction of 5,5‐ 5,6‐ and 5,7‐bicyclic ring systems bearing complex stereochemistry. The chemistry generates intermolecular PKR‐type products in an absolute regio‐ and stereochemical control which is hardly achievable through real intermolecular Pauson‐Khand reactions. A mechanism for this Pauson‐Khand reaction has been proposed based on deuterium labelling experiments.magnified image
Multigram‐Scale Kinetic Resolution of 4‐Acetyl[2.2]Paracyclophane via Ru‐Catalyzed Enantioselective Hydrogenation: Accessing [2.2]Paracyclophanes with Planar and Central Chirality
Authors: Zippel Christoph , Hassan Zahid , Parsa Ahmad Qais , Hohmann Jens , Bräse Stefan 
Published: February 2021

Abstract[2.2]Paracyclophane (PCP) derivatives have been promising platforms to study the element of planar chirality and through‐space electronic communications in π‐stacked molecular systems. To access enantiomerically pure derivatives thereof, a kinetic resolution of 4‐acetyl[2.2]‐PCP employing a ruthenium‐catalyzed enantioselective hydrogenation process was developed. This method can be performed on a multigram‐scale and gives access to enantiomerically pure derivatives with planar and central chirality of (Rp)‐4‐acetyl‐PCP (≥97% ee, 43%) and (Sp,S)‐PCP derivatives (≥97% ee, 46%), which are useful intermediates for the synthesis of sterically demanding PCP‐based ligand/catalyst systems and chiral synthons for engineering cyclophane‐based chiroptical materials.magnified image
Characterization of a Molecule Partially Confined at the Pore Mouth of a Zeotype
Authors: Grosso‐Giordano Nicolás A. , Schroeder Christian , Xu Le , Solovyov Andrew , Small David W. , Koller Hubert , Zones Stacey I. , Katz Alexander 
Published: February 2021

AbstractWe investigate the interaction between a molecule and a pore mouth—a critical step in adsorption processes—by characterizing the conformation of a macrocyclic calix[4]arene‐TiIV complex, which is grafted on the external surface of a zeotype (*‐SVY). X‐ray absorption and 13C{1H} CPMAS NMR spectroscopies independently detect a unique conformation of this complex when it is grafted at crystallographically equivalent locations that lie at the interface of 7 Å hemispherical microporous cavities and the external surface. Electronic structure calculations support the presence of this unique conformation, and suggest that it is brought about by a specific orientation of the macrocycle that maximizes non‐covalent interactions between calix[4]arene upper‐rim tert‐butyl substituents and the microporous‐cavity walls. Our comparative study provides a rare “snapshot” of a molecule partially confined at a pore mouth, an essential intermediate for adsorption into micropores, and demonstrates how surrounding environment controls this confinement in a sensitive fashion.
Third‐degree atrioventricular block and pacemaker implantation in a man with severe hemophilia A: A case report
Authors: Camelo Ricardo Mesquita , Duarte Bruna Pontes , Nascimento Antônio Macedo do , Vanderlei Ana Maria 
Published: February 2021

AbstractHemophilia A (HA) is a rare bleeding disorder characterized by reduced factor VIII (FVIII) activity and consequently spontaneous bleeding. Since the introduction of prophylaxis with safer FVIII concentrates, people with HA are ageing. Interestingly, they are developing cardiovascular diseases as their non‐hemophilia counterparts. We describe a 48‐year‐old patient with severe HA who presented a third‐degree atrioventricular block. A DDDR pacemaker was implanted under supervision of the Hematology Clinics. There were no adverse events during the procedure. The procedure was safe, and it should be performed under the supervision of a hemophilia expert.
Toward Sustainable and Strong ABA‐Type Thermoplastic Elastomers with Poly(ε‐Caprolactone‐co‐4‐Methyl‐ε‐Caprolactone) Soft Midblock and Polystyrene Hard End Blocks
Authors: Yang Qi , Wang Xiaohua , Wang Beibei , Liu Yingjun , Sun Yu , Na Lihua , Wang Feng , Zhang Chunyu , Liu Heng , Zhang Xuequan 
Published: February 2021

AbstractAn array of ABA‐type thermoplastic elastomers (TPEs), that is, poly(styrene‐b‐(ε‐caprolactone‐co‐4‐methyl‐ε‐caprolactone)‐b‐styrene) (SCSs), with controlled molecular weights and narrow distributions, are synthesized by ring opening copolymerization of 4‐methyl‐ε‐caprolactone and ε‐caprolactone and subsequent atom transfer radical polymerization of styrene. Thermal and mechanical analyses indicate that the molecular weights of middle and end blocks have significant effect on both the thermal and mechanical performances. It is worth noting that the target polymer SCS(155, 0.33) shows tensile strength of up to ≈42 MPa and impressive ultimate elongations of up to 1100% which is much higher than common styrenic TPEs. Additionally, SCS(155, 0.33) also displays an elastic recovery value of 91.5% after 19 stress‐strain cycles, suggesting that a good elastic recovery property therein.
Orange‐Red‐emitting Ca9Gd(PO4)7:Eu3+ Phosphors: Judd‐Ofelt Analysis and Investigation on the Thermal Stability, Quantum Efficiency for WLED
Authors: Ha Thu Luu Thi , Tu Nguyen , Duc Anh Dao , Trung Do Quang , Trung Tran Manh , Quynh Nhu Tran Thi , Thi Huyen Nguyen , Van Quang Nguyen , Duy Hung Nguyen , Xuan Viet Dao , Trung Kien Nguyen Duc , Thanh Huy Pham 
Published: February 2021

AbstractOrange‐red‐emitting Eu3+‐doped Ca9Gd(PO4)7 phosphors have been obtained by a sol‐gel technique. These phosphors, excited by UV (270 nm) and near UV light (394 nm), emit orange‐red light in the range of 580–710 nm. The Ca9Gd(PO4)7:7 mol% Eu3+ phosphor annealed at 1100 °C shows the highest PL intensity. Judd‐Ofelt analysis reveals that the neighbor surroundings of Eu3+ ions are asymmetric, and the lowest asymmetry value is found at the dopant ratio of 7 mol%. The optimal phosphor excited by the wavelength of 394 nm displays an excellent thermal stability (∼76.4 % at 160 °C) with an activation energy of 0.163 eV. The corresponding CIE chromaticity coordinates (x; y) and color purity are calculated to be (0.5849; 0.3635) and 84.6 %, respectively. The quantum efficiency values of the Ca9Gd(PO4)7:Eu3+ phosphors coated on UV and near‐UV chips are 87.4 % and 5.1 %, respectively. It is the first time that the QE values of Ca9Gd(PO4)7:Eu3+‐based red and blue‐emitting LEDs are reported.
Wigner functions and quantum kinetic theory of polarized photons
Authors: Hattori Koichi , Hidaka Yoshimasa , Yamamoto Naoki , Yang Di-Lun 
Published: February 2021

Abstract
We derive the Wigner functions of polarized photons in the Coulomb gauge with the ħ expansion applied to quantum field theory, and identify side-jump effects for massless photons. We also discuss the photonic chiral vortical effect for the Chern-Simons current and zilch vortical effect for the zilch current in local thermal equilibrium as a consistency check for our formalism. The results are found to be in agreement with those obtained from different approaches. Moreover, using the real-time formalism, we construct the quantum kinetic theory (QKT) for polarized photons. By further adopting a specific power counting scheme for the distribution functions, we provide a more succinct form of an effective QKT. This photonic QKT involves quantum corrections associated with self-energy gradients in the collision term, which are analogous to the side-jump corrections pertinent to spin-orbit interactions in the chiral kinetic theory for massless fermions. The same theoretical framework can also be directly applied to weakly coupled gluons in the absence of background color fields.
Coulomb and Higgs branches from canonical singularities. Part 0
Authors: Closset Cyril , Schäfer-Nameki Sakura , Wang Yi-Nan 
Published: February 2021

Abstract
Five- and four-dimensional superconformal field theories with eight supercharges arise from canonical threefold singularities in M-theory and Type IIB string theory, respectively. We study their Coulomb and Higgs branches using crepant resolutions and deformations of the singularities. We propose a relation between the resulting moduli spaces, by compactifying the theories to 3d, followed by 3d $$ \mathcal{N} $$
N
= 4 mirror symmetry and an S-type gauging of an abelian flavor symmetry. In particular, we use this correspondence to determine the Higgs branch of some 5d SCFTs and their magnetic quivers from the geometry. As an application of the general framework, we observe that singularities that engineer Argyres-Douglas theories in Type IIB also give rise to rank-0 5d SCFTs in M-theory. We also compute the higher-form symmetries of the 4d and 5d SCFTs, including the one-form symmetries of generalized Argyres-Douglas theories of type (G, G′).
The influence of selected mining and natural factors on the sinkhole creation hazard based on the case study
Authors: Strzałkowski Piotr 
Published: February 2021

AbstractThe formation of sinkholes, especially in developed areas, constitutes a considerable hazard to the public safety. Due to the above, the subject of the paper is a significant and current issue. The paper includes a case study of sinkholes forming over shallow mine galleries. Calculations of the workings’ stability and the impact of the underground mining exploitation have been conducted. The probability of sinkhole formation has been determined as well. The time of sinkholes formation did not correspond with the time in which the mining exploitation affected the gallery workings and the moment in time for which the rock mass deformations caused by the exploitation were at the highest level. The performed exploitation caused occurrence of cracks in the rock mass over the working. This allowed the transportation of the loose overburden by rainwater to workings and as a result sinkholes were created—suffosion occurred. The Quaternary overburden built of sands and sandy loams was probably washed out by rainwater, which led to the formation of sinkholes. In all locations, where shallow voids exist at a depth up to 100 m and the overburden consists of loose rocks, one should consider the probability of sinkholes formation.
Pipe Cleaners as a Low-Cost and Versatile Educational Tool for Teaching Vascular Anatomy
Authors: Franchi Thomas 
Published: February 2021

AbstractTeaching and learning vascular anatomy can be challenging for both educators and students. Cadaveric vasculature is difficult to visualise whilst models are costly and fixed in position. This paper proposes the use of pipe cleaners as a low-cost and versatile educational tool for use by both anatomy educators and students.
Arbuscular mycorrhizal symbiosis facilitates apricot seedling (Prunus sibirica L.) growth and photosynthesis in northwest China
Authors: Bi Yinli , Xie Linlin , Wang Zhigang , Wang Kun , Liu Wenwen , Xie Wenwu 
Published: February 2021

AbstractArbuscular mycorrhizal (AM) fungi can successfully enhance photosynthesis (Pn) and plants growth in agricultural or grassland ecosystems. However, how the symbionts affect species restoration in sunlight-intensive areas remains largely unexplored. Therefore, this study’s objective was to assess the effect of AM fungi on apricot seedling physiology, within a specific time period, in northwest China. In 2010, an experimental field was established in Shaanxi Province, northwest China. The experimental treatments included two AM fungi inoculation levels (0 or 100 g of AM fungal inoculum per seedling), three shade levels (1900, 1100, and 550 µmol m−2 s−1), and three ages (1, 3, and 5 years) of transplantation. We examined growth, Pn, and morphological indicators of apricot (Prunus sibirica L.) seedling performances in 2011, 2013, and 2015. The colonization rate in mycorrhizal seedlings with similar amounts of shade is higher than the corresponding controls. The mycorrhizal seedling biomass is significantly higher than the corresponding non-mycorrhizal seedling biomass. Generally, Pn, stomatal conductance (Gs), transpiration rate (Tr), and water use efficiency are also significantly higher in the mycorrhizal seedlings. Moreover, mycorrhizal seedlings with light shade (LS) have the highest Pn. WUE is increased in non-mycorrhizal seedlings because of the reduction in Tr, while Tr is increased in mycorrhizal seedlings with shade. There is a significant increase in the N, P, and K fractions detected in roots compared with shoots. This means that LS had apparent benefits for mycorrhizal seedlings. Our results also indicate that AM fungi, combined with LS, exert a positive effect on apricot behavior.
Production and characterisation of adsorbents synthesised by hydrothermal carbonisation of biomass wastes
Authors: Danso-Boateng E. , Mohammed A. S. , Sander G. , Wheatley A. D. , Nyktari E. , Usen I. C. 
Published: February 2021

AbstractSurface structure and chemical properties of adsorbents are important factors required to understand the mechanism of adsorption. The purpose of this study was to produce hydrochars from biomass using hydrothermal carbonisation (HTC) and to analyse their sorption capacities. The biomass used in this study were coco-peat (CP), coconut shell (CS), eggshell (ES), rice husk (RH) and lemon peel (LP). The operating conditions for HTC were 200 °C and 20 h residence time. The characterisation methods consisted of Scanning Electron Microscopy (SEM), Energy Dispersive X-Ray Spectroscopy (EDS), Fourier Transform Infrared Ray (FTIR) Spectroscopy, and Brunauer, Emmett and Teller (BET). The results showed that HTC improved the sorption capacities of the biomass wastes. It was found that hydrochars were crispy and flaky with more micro- and meso-porous structures, indicating that lignin and other components were denatured due to carbonisation. This led to the creation of more active sites for sorption and pollutant binding. The hydrochars showed a percentage increase in carbon content and a decrease in oxygen content with traces of other elements, compared to their corresponding raw biomass. The major functional groups identified were –OH and –COOH. The surface area of the hydrochars which include CP (2.14 m2/g), CS (14.04 m2/g), ES (0.50 m2/g), RH (15.74 m2/g), and LP (6.89 m2/g) were significantly improved compared with those of the raw biomass. The study showed that the hydrochars produced from the biomass wastes have the potential to be used as adsorbents.
The Combination of High-Fat Diet and Oral Marijuana Promotes the Development of Fibrosis in the Mouse Corpora Cavernosa
Authors: Nguyen Sabine , Mangubat Michael , Eleswarapu Sriram , Wilson Julian B. , Molina Jocelyn , Abraham Andrea , Artaza Jorge N. , Friedman Theodore C. , Ferrini Monica G. 
Published: February 2021

Abstract

Introduction
The link between cannabis use and erectile dysfunction remains unclear. Moreover, the effect of cannabis in tandem with current Western dietary habits is an area in male sexual health that has yet to be explored. This study seeks to investigate the impact of diet and cannabis on penile health in an animal model.

Aim
To determine the effects of diet and oral cannabis extract on fibrosis and oxidative stress within the corpora cavernosa of mice.

Methods
This is a pilot animal study in which groups of 2-month old C57BL/6J male mice were fed a normal chow diet (NCD) or high-fat diet (HFD) daily and treated with or without either MJ or THC extract for 2 months. After euthanization, mouse penises were isolated and processed for immunohistochemical studies to determine: (i) smooth muscle cell to collagen content, (ii) myofibroblast proliferation, and (iii) anti-oxidative activity.

Main Outcome Measures
Quantitative assessment of immunohistochemical markers of fibrosis and oxidative stress within the corpora cavernosa of mice fed a high-fat diet in combination with either oral marijuana (MJ) or Δ-9-tetrahydrocannabinol extract (THC).

Results
The combination of HFD with MJ resulted in: (i) a decrease in the smooth/collagen ratio in the corpora cavernosa, (ii) an increase in alpha-smooth muscle actin expression in the tunica albuginea compatible with myofibroblast proliferation, and (iii) a decrease in heme oxygenase 1 expression indicating an increase in oxidative stress. Significant histological changes were not observed in the HFD + THC group.

Conclusions
HFD combined with oral MJ extract led to structural alterations in erectile tissue that are associated with accelerated corporal fibrosis. However, the addition of THC to the diet did not exacerbate histological changes within the corpora. Further studies are warranted to elucidate the discrepant effects between MJ and THC in order to optimize the therapeutic potential of cannabis and minimize its adverse effects on penile health.
Vortices over Riemann surfaces and dominated splittings
Authors: METTLER THOMAS , PATERNAIN GABRIEL P. 
Published: February 2021

AbstractWe associate a flow$\phi $with a solution of the vortex equations on a closed oriented Riemannian 2-manifold$(M,g)$of negative Euler characteristic and investigate its properties. We show that$\phi $always admits a dominated splitting and identify special cases in which$\phi $is Anosov. In particular, starting from holomorphic differentials of fractional degree, we produce novel examples of Anosov flows on suitable roots of the unit tangent bundle of$(M,g)$.
THE LONG-TERM IMPACT OF SOCIAL MOVEMENTS AND REPRESSION ON DEMOCRATIC ATTITUDES
Authors: Desposato Scott , Wang Gang 
Published: February 2021

AbstractDemocracy movements in authoritarian regimes usually fail and are repressed, but they may still affect attitudes and norms of participants and bystanders. We exploit several features of a student movement to test for enduring effects of social movements on democratic attitudes. College students were the core of the movement and had wide exposure to the ideas and activities of the movement, as well as the suppression of the movement. College-bound high school students had limited exposure to the movement and its activities. Time of college entry could in theory be manipulated and endogenous, so we also use birthdate as an exogenous instrument for enrollment year. Applying a fuzzy regression discontinuity, we test for the impact of exposure to the movement on long-term attitudes. We find significant attitudinal differences between those in college during the movement, and those who started college post-movement. These results are strongest for alumni of the four universities that were most connected to the movement.
Maternal and child fatty acid desaturase genotype as determinants of cord blood long-chain PUFA (LCPUFA) concentrations in the Seychelles Child Development Study
Authors: Conway Marie C. , McSorley Emeir M. , Mulhern Maria S. , Spence Toni , Weslowska Maria , Strain J. J. , van Wijngaarden Edwin , Davidson Phil W. , Myers Gary J. , Wahlberg Karin E. , Shamlaye Conrad F. , Cobice Diego F. , Hyland Barry W. , Pineda Daniela , Broberg Karin , Yeates Alison J. 
Published: February 2021

AbstractOptimal maternal long-chain PUFA (LCPUFA) status is essential for the developing fetus. The fatty acid desaturase (FADS) genes are involved in the endogenous synthesis of LCPUFA. The minor allele of various FADS SNP have been associated with increased maternal concentrations of the precursors linoleic acid (LA) and α-linolenic acid (ALA), and lower concentrations of arachidonic acid (AA) and DHA. There is limited research on the influence of FADS genotype on cord PUFA status. The current study investigated the influence of maternal and child genetic variation in FADS genotype on cord blood PUFA status in a high fish-eating cohort. Cord blood samples (n 1088) collected from the Seychelles Child Development Study (SCDS) Nutrition Cohort 2 (NC2) were analysed for total serum PUFA. Of those with cord PUFA data available, maternal (n 1062) and child (n 916), FADS1 (rs174537 and rs174561), FADS2 (rs174575), and FADS1-FADS2 (rs3834458) were determined. Regression analysis determined that maternal minor allele homozygosity was associated with lower cord blood concentrations of DHA and the sum of EPA + DHA. Lower cord blood AA concentrations were observed in children who were minor allele homozygous for rs3834458 (β = 0·075; P = 0·037). Children who were minor allele carriers for rs174537, rs174561, rs174575 and rs3834458 had a lower cord blood AA:LA ratio (P < 0·05 for all). Both maternal and child FADS genotype were associated with cord LCPUFA concentrations, and therefore, the influence of FADS genotype was observed despite the high intake of preformed dietary LCPUFA from fish in this population.