bluuebunny/crossref_metadata_2025 huggingface dataset:
Determinación de recomendaciones de diseño de losas de vigueta y bovedilla y losas macizas de concreto reforzado sujetas a vibración
Authors:   , Caballero Garatachea Omar
Published: March 2023

El presente trabajo proporciona recomendaciones para el análisis y diseño de sistemas de piso ante vibración vertical debida a actividades humanas. En particular se estudian las losas de concreto reforzado en dos direcciones y las losas de vigueta y bovedilla. El objetivo principal es desarrollar expresiones prácticas para el cálculo de la frecuencia natural fundamental fn, y de la aceleración máxima, amax, de sistemas de piso de concreto reforzado debida a actividades humanas, así como recomendaciones derivadas de modelos numéricos y experimentales. Esto se debe a que, aunque existen especificaciones para el análisis y diseño de sistemas de piso ante vibración debida a actividades humanas, la mayoría tratan losacero o requieren de modelos numéricos complejos para determinar fn y amax. En este trabajo se desarrollan aproximaciones analíticas para el cálculo de la frecuencia natural, así como un estudio sobre su comportamiento en losas de concreto reforzado. Además, se realizó un estudio de la susceptibilidad ante vibraciones excesivas debidas al caminar de personas en losas de concreto reforzado con base en la normatividad existente. Posteriormente, se realizó un estudio numérico-experimental sobre el comportamiento dinámico de losas de concreto reforzado en dos direcciones y de vigueta y bovedilla ante distintos tipos de actividades humanas. También, se evaluaron algunas funciones de carga dinámica, representativa del caminar de personas, así como una metodología para cálculo de la respuesta dinámica en losas de concreto reforzado en dos direcciones. Con los elementos obtenidos de este trabajo se proporciona una guía para el análisis y diseño de sistemas de piso ante vibración debida a actividades humanas, pues se proporcionan expresiones para determinar la fn y la amax de los sistemas de piso, de tal manera que se controlan sus niveles de vibración. En el desarrollo analítico de este trabajo, los tableros se idealizaron como sistemas de un grado de libertad con lo que se desarrollaron las expresiones para determinar la frecuencia natural fundamental, así como para la obtención de la respuesta dinámica en términos de la aceleración. Por lo que se refiere a la parte experimental se realizaron pruebas de vibración ambiental y forzada utilizando sensores de aceleración en los puntos de amplitud modal máxima; mientras que, en la parte numérica, se realizaron simulaciones de losas modeladas con elementos finitos tipo lámina y viga, donde se utilizó un material homogéneo, elástico e isótropo.
Estudio experimental y analítico de conexiones rígidas de acero entre vigas de sección I con columnas de sección hueca
Authors:   , Jesús de la Cruz Hiram
Published: March 2023

Se planea la realización de un estudio experimental y analítico que proyecta evaluar el desempeño de diferentes configuraciones de diafragmas (internos y externos) en conexiones entre vigas IR (W) a columnas huecas (OR o HSS, y cajón) que puedan ser potencialmente aplicables a la práctica estructural en México. La tesis se organiza en siete capítulos estructurados de la siguiente manera: En el Capítulo 1 se plantea la descripción del problema, los objetivos del mismo, así como, los alcances y limitaciones considerados en este proyecto. A continuación, en el Capítulo 2, se presenta un resumen de los estudios experimentales y analíticos previos relativos a la evaluación del comportamiento o simulación numérica de conexiones viga columna, especificaciones de diseño disponibles para este tipo de conexiones. En el Capítulo 3 se abordan aspectos generales relativos a la fabricación de conexiones viga-columna de configuraciones similares a las que se abordan en este proyecto de investigación. En el Capítulo 4 se describe el programa de estudio experimental, las características del sistema de prueba, configuración de los especímenes de prueba, sistema de instrumentación y programa de prueba experimental, así como, los resultados obtenidos. En el Capítulo 5 se describe el programa de estudio analítico, definición de las características de los especímenes a considerar, definición del tipo de análisis y los resultados obtenidos de las simulaciones numéricas. En el Capítulo 6, se presenta la discusión de resultados, asociando los eventos observados en la prueba experimental y su correlación con resultados analíticos. Por último, el Capítulo 7, se presentan las conclusiones obtenidas del presente trabajo de investigación y se formulan recomendaciones de trabajos a futuro.
Diseño basado en desempeño de edificios de mampostería confinada con comportamiento no lineal en flexión
Authors:   , Espinosa Cazarín Eric Fernando
Published: March 2023

Trabajo que se divide en 4 etapas: en la primera etapa; se realizó un estudio analítico para determinar el desempeño sísmico de 4 edificios de mediana altura seleccionados de una base de datos de edificios con características típicas de la práctica profesional de la Ciudad de México CDMX (Cardel, 2015), diseñados de acuerdo con la normativa vigente de la CDMX y evaluando su comportamiento no lineal con el método modificado de la columna ancha propuesto por Zúñiga y Terán-Gilmore (2009), adaptado en este trabajo para considerar los efectos del incremento de la altura de los edificios. En la segunda etapa; se calibró y validó un modelo analítico basado en plasticidad concentrada y la degradación de la envolvente de la resistencia en corte para caracterizar el comportamiento de MMC con comportamiento no lineal en flexión, con esta información, se desarrolla una metodología basada en desempeño de edificios de mampostería confinada con comportamiento no lineal en flexión utilizando algunos de los conceptos propuestos previamente en los documentos del Federal Emergency Management Agency FEMA y otros. En la tercera etapa; se desarrolla la metodología propuesta en la etapa anterior, para ello se retoman los edificios diseñados en la primer etapa, se realizan una serie de adecuaciones a éstos para modificar su comportamiento de uno regido por corte a uno por flexión y se corrobora su desempeño sísmico con técnicas de análisis no lineal. Finalmente, la cuarta y última etapa; consiste en realizar una comparativa en términos de la respuesta sísmica, así como el potencial de impacto ambiental de una de las edificaciones estudiadas en las etapas 1 y 3. Los edificios diseñados en la primera etapa de este trabajo no cumplieron a cabalidad los objetivos de diseño previstos en la misma normativa cuando estos alcanzan la deformación máxima permisible. Por otro lado, los edificios diseñados con la metodología propuesta en este trabajo (tercera etapa), muestran un mejor desempeño sísmico para el mismo nivel de deformación lateral. En cuanto a la comparativa realizada; el sistema estructural del edificio diseñado con la metodología propuesta resulta ser más ligero y tiene un menor impacto ambiental en comparación con el edificio diseñado de acuerdo con la normativa actual. Los resultados obtenidos en este trabajo muestran que un cambio tanto en el enfoque del diseño de edificaciones de mampostería confinada; es decir, modificar el comportamiento no lineal en corte por el de flexión, así como un cambio en la filosofía de diseño, al utilizar el diseño basado en desempeño en vez del diseño basado en fuerzas permiten el diseño de edificios de mampostería confinada de mediana altura con un desempeño estructural que se apega a las tendencias recientes de resiliencia, además de reducir el impacto ambiental.
Análisis de estructuras propensas a fallar por mecanismo de piso suave
Authors:   , Hernández García Daniel Alberto
Published: March 2023

Se les conoce como pisos suaves (blandos) y débiles a aquellos entrepisos dentro de una estructura que tienen una reducción significativa en su rigidez y/o resistencia lateral con respecto a los siguientes entrepisos, principalmente los inmediatos superiores. Los entrepisos con este mecanismo resultan perjudiciales para el comportamiento global de la estructura. En esta investigación se realizó un estudio paramétrico tomando en cuenta variables propias de la estructura, que a través del análisis de varios modelos con disposición de piso suave se describan las causas y las consecuencias de dicho mecanismo, así como factores que promueven o amplifican esta falla. Además, se proporcionan sugerencias de cómo modelar y diseñar edificios que presenten una configuración de elementos que corresponda a piso suave y/o débil. Esta investigación, junto con trabajos existentes, procura formar una base sólida, en la cual se puedan fortalecer las recomendaciones específicas en la normativa existente para tratar estos mecanismos de falla, y evitar pérdidas humanas y materiales en la respuesta sísmica de estructuras con pisos flexibles.
Metodología para el análisis de socavación en puentes
Authors:   , Cruz Vargas José Giovanni
Published: March 2023

En este trabajo se estudian aspectos de estabilidad por socavación, en el capítulo uno se inicia por una introducción de lo que es la socavación, los métodos más comunes para calcularla y las problemáticas que esta ha causado en puentes mexicanos; en este sentido, se construyó una base de datos de puentes colapsados en México del año 1997 a 2017. Se considera que esta base de datos es el primer aporte amplio sobre puentes colapsados porsocavación en México, ya que presenta información puntual para cada colapso. En el capítulo dos se presenta un estudio de dinámica de fluidos para tres casos de cimentaciones de puentes recurrentemente encontrados en la base de datos de puentes colapsados, para comprender mejor la evolución de la socavación en estas cimentaciones. En el capítulo tres se presentan recomendaciones sobre la modelación de aspectos hidrológicos, hidráulicos, geotécnicos y estructurales, con el fin de evaluar la estabilidad de puentes por socavación; también en este capítulo se presenta el puente que se utilizó como caso de estudio. En el capítulo cuatro se presenta un enfoque para analizar la estabilidad del caso de estudio basado en simulación de historias de lluvias, para este caso la información obtenida de las estaciones climatológicas se trabajó con el objetivo de crear curvas de intensidad-duraciónfrecuencia de lluvias y curvas de peligro en términos de gasto para el sitio del puente; en este enfoque se utilizó un periodo de retorno de 500 años para revisión de estabilidad. En el capítulo cinco se presenta un enfoque basado en una caracterización rigurosa de la amenaza hidrológica, que consiste en el estudio del mecanismo cuenca, lluvia y gasto, de tal forma que se logró obtener un modelo hidrológico que describe con una aproximación razonable el gasto en el punto del puente. Con este modelo fue posible generar gastos aleatorios característicos del sitio en estudio suponiendo las llegadas de estos se pueden describir como procesos de Poisson. En el capítulo seis se presenta un enfoque novedoso para la revisión de la estabilidad basado en la caracterización de la amenaza hidrológica a nivel de duración de lluvia y revisión de tres estados límite de falla (volteo, pérdida de cubierta y resistencia última de la pila), en este enfoque es posible acumular profundidades de socavación para múltiples eventos y encontrar una profundidad mínima de desplante de la pila asociada a una probabilidad de excedencia. En los tres enfoques (capítulos 4, 5 y 6) se construyó una metodología que caracteriza de forma rigurosa y novedosa (en el caso del capítulo 6) el proceso lluvia-socavación en la pila del puente de estudio, para eventos de lluvia en intervalos de 10 años hasta llegar a 75 (vida de servicio del puente), se revisa el estado del puente.
Delay analysis of mixed CNT bundles as global interconnect for nanotechnology nodes
Authors: Dhillon Gurleen , Sandha Karmjit Singh
Published: March 2023

This paper presents modeling of high current capability of mixed carbon nanotube (CNT) bundle interconnects depending upon the type of constituent CNT materials and their orientations. With different arrangements, one category of novel mixed CNT bundles formed by the combination of multi-walled/multi-shell CNT and double-shell CNT bundles (MDCB) are proposed and compared with the mixed CNT bundles (MSCB) formed with multi-shell CNT and single-walled CNT bundles. A time-domain analysis is performed for these structures to analyse the effect of delay and power dissipation. It has also been observed that MDCB structures give better performance (≈ 30%) than MSCB structures in terms of power-delay product at the global length of interconnect for nano-regime technology nodes. Also, MDCB structure formed by placing multi-walled CNTs along the periphery and double-walled CNTs in the centre of structure yields the best result against all proposed mixed CNT bundled structures and can be employed for future interconnect applications.
A portable multispectral vein imaging system
Authors: Ozkan Haydar , Aydin Muberra , Ozcan Osman Alpcan , Zengin Ummuhan
Published: March 2023

Phlebotomy may cause unnecessary injuries to a patient whose veins are not easily visible to a healthcare professional. To mitigate this problem we designed a new system to image subcutaneous veins. Multispectral images were obtained using a microprocessor, an IR (infrared) camera, different wavelengths of NIR (near-infrared) sources, and an IR band-pass filter. Raw vein images were enhanced, colored, and displayed on a monitor using an easy-to-use interface. The mean dice similarity index (DSI) between the vein border specified by a doctor on the raw images manually and the automated segmented by the proposed system is determined as 0.92 ± 2.1 for 20 subjects. Also, the average peak signal-to-noise ratio (PSNR) obtained a high value of 68.37 ± 1.56 from the enhanced image. Phlebotomists can easily observe the subcutaneous veins in real-time with the three different options using the proposed device. As a result, this study advances the vein imaging field which has the potential to reduce injury to the patient during venipuncture.
Investigation of Flux Transfer along Ferrite Core of Probe Coil for Eddy Current Nondestructive Evaluation
Authors: Zhang Siquan
Published: March 2023

A probe coil with a T-core above a layered conductor with surface hole is investigated for magnetic flux transfer along the ferrite core and enhancement of eddy currents in conductor. The cylindrical coordinate system is adopted and an artificial boundary is added to the solution domain with radius b, and the general formula for calculating the impedance of the T-core coil is derived using the truncated region eigenfunction expansion (TREE) method. For four special cases with different probe configurations, coil impedance changes due to the layered conductor and defect are calculated with Mathematica software over a frequency change ranging from 100 Hz to 20 kHz. The analytical results are in good agreement with those obtained by the finite element method and experimental measurements. The results show that under the same lift-off height and excitation frequency, the impedance change caused by the conductor or defect in the coil of long core column is greater than that of the short core column coil. It indicates that the probe coil with a long core column can transfer magnetic flux to the conductor, thereby enhancing eddy currents in the conductor.
Reactive Power and Energy Instrument’s Performance in Non-Sinusoidal Conditions Regarding Different Power Theories
Authors: Demerdziev Kiril , Dimchev Vladimir
Published: March 2023

It is important to conduct the examination of reactive power and energy instruments in normal operating conditions, due to their place in the regulated trade of electrical energy. The challenge arises when the normal operating conditions encompass non-sinusoidal voltages and currents, for two main reasons: the fact that the term reactive power/energy is not unambiguously defined in case of harmonically polluted environment and the fact that the measurement algorithm implemented in the meter is usually not explicitly presented by the producer. Different algorithms provide the same result in case of sinusoidal signals, while in case of harmonics the instrument’s performance may vary significantly, when different power theories are adopted. In the paper, a commercially available reactive energy electricity meter is tested with harmonically distorted voltage and current signals, and an analysis of its output is performed from the perspective of the implemented measuring algorithm, which is not known a priori. The tests encompass alteration of different waveform parameters and the instrument’s output is analyzed from the perspective of several reactive power theories. The conclusion of the analysis results in the meter’s performance feature illustration in correlation with different harmonic parameters and different reference conditions.
Testing the Performance of the Video Camera to Monitor the Vertical Movements of the Structure via a Specially Designed Steel Beam Apparatus
Authors: Eren Mehmet , Hoşbaş Ramazan Gürsel
Published: March 2023

This article focuses on a specially designed steel beam testing apparatus to determine the dynamics of the structure using data obtained from different sensor systems. The analysis of these different sensor systems is performed by processing data recorded by the Global Navigation Satellite System (GNSS), vision based measurement (video camera), and accelerometer surveys. To perform this analysis, the accelerometer and GNSS receiver are installed at the steel beam’s mid-span position. The high-contrast artificial target attached to the accelerometer is recorded by a video camera to monitor the structural dynamics. Steel beam experiments show that it is compatible with the accelerometer, which is predicted as a reference sensor in detecting motion with an amplitude of 10 mm and above in the vertical direction with GNSS and determining the structural frequency by spectral analysis. On the other hand, we concluded that the video camera can be used to determine the structural dynamics in SHM because its results were compatible with the reference data even if the amplitude was too small.
Equivalence Ratio Modelling of Premixed Propane Flame by Multiple Linear Regression Using Flame Color and Spatial Characteristics
Authors: Yang Hao , Lai Yufeng , Liu Xuanqi , Jiang Houshi , Yang Jiansheng
Published: March 2023

Equivalence ratio (Φ) is one of the most important parameters in combustion diagnostics. In previous studies, flame color characteristics have been widely applied to model the Φ of premixed hydrocarbon flames. The flame spatial characteristics also change with the varying Φ. In this paper, a high-speed color camera was employed to capture the premixed propane flame images under different Φ conditions (Φ = 0.93 to 1.53). Then, the relationship between the spatial characteristics and the Φ variation was investigated. The area and height of propane premixed flames perform a strong sensitive response to the Φ variation. Based on the research above, the Φ measurement models were constructed using color and spatial characteristics. A comparison was made between the color characteristics (Color-Φ) model and the color-spatial characteristics (Multi-dimensional-Φ) model. Both models were applied to a set of color images of a premixed propane flame, and the result indicates that the Multi-dimensional-Φ model performs with higher accuracy.
The God of Qohelet: Positive Divine Attributes for an Age of Technology
Authors: Botica Aurelian
Published: March 2023

The book Ecclesiastes has been regarded as one of the most profound pieces of ‘wisdom’ literature in the ancient Orient. It rivals in depth and the courage to challenge the institutional status quo with the literature from Mesopotamia and Egypt. It has puzzled readers in the last three millennia with its unparalleled courage to ask uncomfortable questions about faith, Gods and humanity. Ironically, many of the questions that Ecclesiastes asked have found reverberations in the hearts of post-modern men and women today. On the one hand, the author affirms his belief that one can discern the ‘hand of God’ dispensing justice even in the most tragic of circumstances. On the other hand, Ecclesiastes confesses that, even though he applied his heart ‘to know wisdom and to know madness and folly,’ in the end he perceived ‘that this also is but a striving after wind.’ His conclusion? ‘Vanity of vanities: all is vanity!’ Statements like these have compelled us to approach Ecclesiastes in order to find the equilibrium in his vision between ‘despair’ and ‘hope.’ To do so, we will select a number of divine attributes that offer clarity not only to the vision of God in Ecclesiastes, but also to the sensitive issues of the meaning of life, suffering, justice, death and eternity. In the course of our analysis we will examine the views of contempoerary scholars who have written on this subject. We will show how Ecclesiastes’ vision takes into account human suffering and despair, without sacrificing the integrity of hope.
‘Does God Ever Feel Sorry?’ Understanding Verbs of Divine Emotion in the Pentateuch and the Targumic Versions of Onkelos, Neofiti and Pseudo-Jonathan
Authors: Botica Aurelian
Published: March 2023

In the present study we will direct our attention to the particular instances in which God appears as the subject of the verb נחם in the Pentateuch, where the context describes the reaction of ‘regretting’ or ‘repenting’ over a previous decision. In addition, in order to find out whether the Aramaic translators were consistent when trying to avoid anthropomorphisms, we will look at several of the occurrences of the verb in situations where it appears with a human, not a divine subject. This comparative approach will allow us to locate the different dimensions of the semantic field in which a given verb functions. Hopefully the wider the picture of this field, the better the chances are that we will understand the motivations and beliefs that informed the particular choices the translators made.
Stress in the Pastoral Ministry a Study Among Hungarian Baptist Pastors
Authors: Giorgiov Adrian
Published: March 2023

According to Scripture, pastors have an important role in accomplishing the task Jesus Christ entrusted to His body, the Church: making disciples. The degree of pastors’ effectiveness can influence the accomplishment of this task. Stress is an important factor in pastors’ life and ministry, and it can thwart the realization of the mandate received by Jesus Christ. This study, after presenting a number of concepts related to stress and the definition of it, focuses on internal contributors to stress, then continues with an overview of symptoms and stages of stress. Helpful methods of dealing with, reducing, preventing, and integrating stress are studied, then some theological implications conclude the paper. The study is combined with data drawn from the life and ministry of Hungarian Baptist pastors.
Carl Stumpf Lecteur de Husserl1
Authors: Fisette Denis
Published: March 2023

This paper focuses on Carl Stumpf’s evaluation of Husserl’s phenomenology in his Logical Investigations and in the first book of Ideas. I first examine Stumpf’s reception of the phenomenology of the Logical Investigations. I then turn to §§ 85-86 of Ideas, in which Husserl seeks to distinguish his “pure” phenomenology from Stumpf’s phenomenology. In the third part, I examine Stumpf’s critique of the new version of phenomenology that Husserl develops in his Ideas in §13 of Erkenntnislehre, and, in the fourth part, I examine the Spinozist interpretation of noetic-noematic correlations in Stumpf’s two studies of Spinoza. I conclude by asking whether the version of phenomenology that Husserl elaborates on during the Freiburg period does not anticipate, to some extent, Stumpf’s criticisms while confirming the latter’s diagnosis of the phenomenology of Ideas.
The Believed as Believed: The Noematic Dimensions of Faith and Doubt in Religious Experience
Authors: McNeilly Jodie
Published: March 2023

Countless scholars have wrestled with the ambiguities and complexities in determining the role of the noema in Husserl’s theory of intentionality since his transcendental turn, and consequently converted what was intended to be a structural solution to a problem into a contested problem itself.1 Shifting emphasis from the ‘whatness’, or ontological concerns of the correlate noesis—noema to the ‘howness’, or methodological force of phenomenology, allows me to discuss two things. The first is theological. Before and since Janicaud’s pronouncement of the ‘theological turn’ in phenomenology, the intentionality thesis has been rejected as a means to account for certain experiences given differently to object-phenomena (Janicaud, 2000). In accounting for religious experience as a complex movement between faith and doubt, my work reaches not for the ‘essence of phenomenality’ (Marion), or a givenness beyond intuition made invisible, nor does it seek to describe a transcendence beyond immanence, or proof in the existence of a god/gods, rather it concerns itself with the processes and underlying structures of belief. Arguably by focusing upon the noetic and noematic structure of intentional acts, intentional analysis is revitalised for delineating the belief modalities of faith and doubt in religious experiences.
A Generalization of Eisenstein-Schönemann’s Irreducibility Criterion
Authors: El Fadil Lhoussain
Published: March 2023

The Eisenstein criterion is a particular case of the Schönemann’s irreducibility criterion stated in 1846. In 1906, based on Newton polygon techniques, Dumas gave a generalization of the Eisenstein criterion. In this paper, we extend this last generalization. Some applications on factorization of polynomials, and prime ideal factorization will be given, too.
Commutativity Theorems and Projection on the Center of a Banach Algebra
Authors: Moumen Mohamed , Taoufiq Lahcen
Published: March 2023

Let 𝑥 be a Banach algebra. In this article, on the one hand, we proved some results concerning the continuous projection from 𝑥 to its center. On the other hand, we investigate the commutativity of 𝑥 under specific conditions. Finally, we included some examples and applications to prove that various restrictions in the hypotheses of our theorems are necessary.
Identification With All Humanity Predicts Perceptions of COVID-19 Safety Precautions
Authors: Ferqueron Morgan , Bassett Jonathan F. , Cleveland Amanda J.
Published: March 2023

Factors related to compliance with and perceptions of public health measures concerning COVID-19 were examined in 2 studies. Study 1 was administered in spring 2020 via a university list serve and social media (n = 512, Mage = 34.51). Study 2 was administered in fall 2020 via Amazon Mechanical Turk, a university list serve, and social media (n = 523, Mage = 31.55). In both studies, participants completed measures of identification with all humanity (IWAH), the 10-item personality inventory (TIPI), social dominance orientation (SDO), right-wing authoritarianism (RWA), political orientation, and religion. In Study 1, participants also completed measures regarding how concerned they were about the effects of COVID-19 on society, how much they supported canceling events to promote social distancing, and how much they altered their behavior to avoid gatherings. In Study 2, participants were asked about the extent to which they engaged in recommended behaviors intended to reduce the spread of COVID-19 and their compliance with mask guidelines. Over and beyond the influence of any other factors, IWAH was associated with greater concern about the health of society with regard to COVID-19 and more altering of behavior to avoid gatherings in Study 1 and with more mask compliance in Study 2. These data suggest that a fruitful tactic for increasing compliance with public health measures for COVID-19 might be framing the issue as a way to contribute to welfare of broader society.
Psychological and Behavioral Predictors of Procrastination in Undergraduates
Authors: Gregory Bradley B. , Golson Megan , Larsen McKay
Published: March 2023

Utilizing previous work in personality theory, implicit theory of intelligence, goal orientation, and self-efficacy theory, we conducted this exploratory study to identify predictors of general procrastination tendencies among undergraduates. We analyzed a sample of 267 undergraduate students from introductory psychology courses at a public rural university. A standard multiple regression analysis using IBM SPSS Statistics was performed on 16 psychological variables and 1 behavioral variable to identify presence of predictive influence on the dependent variable of procrastination as measured by Lay (1986) for college student populations. Regression analysis revealed that the model achieved significance at predicting procrastination in undergraduate students, F(17, 249) = 14.73, p < .001, r2 = .50, adj r2 = .47. The resultant model identified 4 significant predictors and 9 additional significant correlates, 7 of which were significant at p < .01. Positive predictors included growth mindset beliefs (β=. 16, p = .003) and academic entitlement beliefs (β = .12, p = .023). Negative predictors included conscientiousness (β = –.55, p < .001) and college student efficacy beliefs (β=– .17, p = .011). These findings are consistent with previous work and further support the roles and directional influences of conscientiousness, college student efficacy beliefs, and implicit theory of intelligence beliefs on procrastination, and add to the growing literature on academic entitlement beliefs.
Assessment of Nutritional Composition and Antioxidant Properties of Dysphania ambrosioides (L.) Mosyakin & Clemants and Crassocephalum crepidioides Leaf Meal as Potential Feed Additives
Authors: Falowo Andrew Bamidele , Oloruntola Olugbenga David , Akinmoladun Oluwakamisi Festus
Published: March 2023

This study analyzed the proximate, minerals, phytochemical profiles and antioxidant capacity of Dysphania ambrosioides (L.) Mosyakin & Clemants and Crassocephalum crepidioides (Benth.) S.Moore leaf meals as potential feed additives. The result of the proximate analysis revealed that C. crepidioides contained higher moisture (6.66%), ash (21.04%), crude fibre (3.85%), crude fat (5.41%), crude protein (17.11%) contents and lower carbohydrate content (45.60%) than D. ambrosioide leaf powder which had 6.31% moisture, 13.69% ash, 3.09% crude fibre, 4.48% crude fat, 15.99% crude protein and 56.12% carbohydrate. The result of the mineral analysis showed that D. ambrosioides contained higher concentration of sodium (19.8ppm), potassium (51.05ppm), calcium (29.18ppm), magnesium (24.1ppm), iron (0.42ppm) manganese (0.33ppm) and zinc (0.91ppm) compared to C. crepidioides leaf meal at sodium (18.71ppm), potassium (41.87ppm), calcium (25.77ppm), magnesium (20.34ppm), iron (0.28ppm) manganese (0.13ppm) and zinc (0.36ppm). The result of the phytochemical analysis revealed that aqueous extract of C. crepidoides possessed higher total phenolic (13.34 mgGAE/g) and flavonoid (2.29 mgrutin/g)) contents than that of D. ambrosioides at (13.07 mgGAE/g) and (1.62 mgrutin/g) respectively. The Tannin and phytate contents were significantly higher in D. ambrosioides leaf meal at 2.39mg/g and 40.28 mg/g respectively, compared to that of C. crepidioides at 2.12mg/g and 29.4mg/g, respectively. The aqueous extract of D. ambrosioides exhibited higher that antioxidant free radical scavenging activity (24.83%) than that of C. crepidioides (16.42%). In conclusion, this study has shown that these two vegetables contained nutrients and antioxidant and could be used as alternative feed additives in animal nutrition.
Effect of Biofertilizers and Organic Amendments on Germination and Seedling Growth of Common Dry Zone Forest Species in Sri Lanka: Sustainable Reforestation Practices in Sri Lanka
Authors: Yapa Neelamanie , Jayakody Nadeesha , Madhushan Asanka , Pelawatta Anuhansi
Published: March 2023

Most of the dry zone forests in Sri Lanka are arisen after unsustainable farming practices. Therefore, the natural regeneration of plant species in these forests reported to be very poor due to the reduced soil fertility. This study was conducted to find possible measures for the successful seed germination and seedling establishment of common dry zone forest tree species by sustainable soil fertility management. A pot trial was carried out in a greenhouse at the Faculty of Applied Sciences, Rajarata University, Mihintale, Sri Lanka. The experiment comprised of 128 pots and four replicates. Pots were assigned with different soil fertility managements: T0: control (Top soil only), T1: Arbuscular Mycorrhizal Fungi (AMF), T2: a traditional mixed microbial culture (Jeewamurthum), T3: Compost, T4: Biochar, T5: T1+T2, T6: T1+T3, T7: T1+T4; and different forest plant species: Manilkara hexandra, Feronia limonia, Pterospermum conscens and Bauhinia racemosa. Seed germination percentage was measured two weeks after sowing, and shoot biomass, relative plant growth rate, and AMF colonization percentage were measured after four months of germination. The results revealed that inoculation of AMF enhance the seed germination percentage of all the selected plant species. Both sole and combined application of AMF and compost gives more benefits to all the tested plant species by enhancing all the measured growth parameters. The findings of present study would be useful in reforestation programs of dry zone forests in Sri Lanka by practicing sustainable procedures.
Effects of Dried Tomato, Apple and Grape Pulps on the Performance, and Egg Quality of Laying Hens
Authors: Akyol Güneycan , Denli Muzaffer
Published: March 2023

The purpose of this study was to determine the dietary effects of fruit pulps (dried tomato, apple and grape) on the performance and egg quality characteristics of laying hens. In this trial, 196 Lohmann sandy layers 25 weeks of age were distributed into four groups with seven replicates for 9 weeks. Trial groups fed following diets, control group basal diet (no additive), 4 % dried tomato pulp, 4% apple pulp and 2.5% grape pulp. Feed conversion rate was not affected by any addition of fruit pulps throughout the trial. The dietary inclusion of dried tomato pulp increased feed consumption, egg weight and egg production and decreased egg yolk malondialdehyde (MDA) levels on day of 1 compared to the control. Egg yolk MDA level was decreased with the addition of 4% tomato and apple pulp to the diet, but increased with the addition of 2.5% grape pulp to the diet on the day of 28. Moreover, the addition of dried tomato pulp to the basal diet significantly increased egg weight and egg yolk yellow color (a). As a result, this study provides evidence that adding up to 4% tomato pulp to diets may be used without adverse effects on laying hens’ productivity and may improve egg quality characteristics by decreasing MDA levels in the yolk.
Expunging Board of Pharmacy Disciplinary Actions
Authors: Adams Alex , Frost Timothy P.
Published: March 2023

Boards of pharmacy have the authority to discipline licensees whose actions fall short of practice standards. Disciplinary action may include license suspension, revocation, practice restrictions, fines and reprimands. Once discipline is levied against a board of pharmacy licensee, it is usually part of the licensee’s permanent record. At least four states have created a pathway for individuals to seek expungement of previous disciplinary actions levied by a board of pharmacy. These states have variations on what violations may be expunged and when. Given the evolving approach to the regulation of pharmacists, more states may want to consider expungement pathways in the years ahead.
Before a Failing Breeze: Sailing Labor in the Final Years of Sail on the Great Lakes
Authors: Ioset Benjamin
Published: March 2023

Sailing commerce on the Great Lakes underwent a protracted decline between the mid-1870s and its ultimate disappearance in 1931. In its final half-century, the pressures of economic marginalization, falling profit margins, novel marine technologies, and the emergence of distinct steam and sail maritime labor sectors all resulted in a radical redefinition and changes to nearly all aspects of the sailor’s experience. This paper will explain how the experience and occupation of the seaman changed in response to these pressures.
Le commerce de la voile sur les Grands Lacs a connu un ralentissement prolongé du milieu des années 1870 à sa disparition définitive en 1931. Au cours de son dernier demi-siècle, les pressions exercées par la marginalization économique, la baisse des marges bénéficiaires, les Nouvelles technologies marines et l’apparition de secteurs distincts de la main-d’oeuvre maritime à vapeur et à voile ont provoqué une redéfinition fondamentale et des changements dans presque tous les aspects de l’expérience des marins. Cet article explique comment l’expérience et la profession des marins ont évolué en réaction à ces pressions.
Un legado transgresor:
Authors: Bello Ramírez Alanis
Published: March 2023

La pedagoga afroamericana bell hooks generó un legado de suma importancia para las luchas feministas y antirracistas en todo el mundo. En este artículo rindo homenaje a su vida y a sus ideas sobre educación. Por  medio de la revisión documental de su trilogía pedagógica, elaborada entre 1994 y 2010, categorizo tres conceptos medulares, a saber: la pedagogía comprometida, el amor como praxis emocional crítica y la  espiritualidad como fin de la educación. A partir del mapeo de sus contribuciones, sostengo que su legado transgresor nos invita a trabajar sobre las emociones, el amor radical y la sanación como elementos  ineludibles de la práctica educativa descolonizadora. Finalmente, resalto que la recuperación del legado de bell hooks constituye un acto de resistencia a las prácticas de supresión del pensamiento feminista negro en  el campo educativo.
Metaverso y la educación del copy-paste: la invasión de las plataformas digitales
Authors: Pineda-Luna Omar
Published: March 2023

El siguiente escrito presenta los comienzos de la economía digital en el Silicon Valley de San Francisco, California. Asimismo, problematiza los alcances y límites de la digitalización de la educación después de la pandemia. Bajo la idea predominante de las bonanzas educativas, gracias al uso de plataformas digitales, se levanta la otra cara de la moneda: la sobreexplotación de lo cognitivo. Con esto la educación del copy-paste pasa a debatirse entre la educación virtual tradicionalista y la metaeducación virtual.  Además, se presentan dos posturas; los que defienden el uso de las tecnologías (tecnorománticos) y los que observan cautelosamente el uso de estas herramientas (tecnofóbicos) con sus consecuencias en la educación.
Propuesta práctica de TGfU basada en situaciones de aprendizaje alternativas y sus efectos sobre el aprendizaje y actitudes sociales de escolares de Educación Física en Educación Primaria
Authors: Alonso-Cayuelas María , Arias-Estero José L.
Published: March 2023

El objetivo del estudio fue comprobar el efecto de tres sesiones de Teaching Games for Understanding (TGfU) empleando deportes alternativos sobre el conocimiento y destrezas de juego y variables actitudinales de alumnado del último ciclo de Educación Primaria en Educación Física. Participaron 35 discentes (18 chicos y 17 chicas, 10-12 años). El diseño del estudio fue cuasi-experimental con medidas pre-test y post-test. La variable independiente fue la implementación de las tres sesiones con TGfU. Las variables dependientes fueron: el conocimiento de juego (conocimiento táctico y técnico), destrezas de juego (destrezas tácticas y técnicas) y variables actitudinales (relaciones sociales, participación, respeto a las reglas y respeto a iguales). Se formó a la docente durante 30 horas, se diseñaron y validaron las sesiones, se llevaron a cabo las sesiones en dos semanas y se verificó la intervención. Los datos fueron tomados por la docente, mediante la observación directa, empleando tres escalas tipo Likert diferentes. El alumnado mejoró en conocimiento de juego, destrezas y actitudes sociales, pero no en respeto a iguales, porque tuvo valores máximos en ambas evaluaciones. El TGfU permite la enseñanza competencial a través de situaciones de aprendizaje que integran saberes de varios contenidos a partir de situaciones problema.
Inverse design of viral infectivity-enhancing peptide fibrils from continuous protein-vector embeddings
Authors: Kaygisiz Kübra , Dutta Arghya , Rauch-Wirth Lena , Synatschke Christopher V. , Münch Jan , Bereau Tristan , Weil Tanja
Published: March 2023

Amyloid-like nanofibers from self-assembling peptides can promote viral gene transfer for therapeutic applications. Traditionally, new sequences are discovered either from screening large libraries or by creating derivatives of known active peptides. However, the discovery of de novo peptides, which are sequence-wise not related to any known active peptides, is limited by the difficulty to rationally predict structureactivity relationships because their activities typically have multi-scale and multi-parameter dependencies. Here, we used a small library of 163 peptides to predict de novo sequences for viral infectivity enhancement using a machine learning (ML) approach based on natural language processing. Specifically, we trained an ML model using continuous vector representations of the peptides, which were previously shown to retain relevant information embedded in the sequences. We used the trained ML model to sample the sequence space of peptides with 6 amino acids to identify promising candidates. These 6-mers were then further screened for charge and aggregation propensity. The resulting 16 new 6-mers were tested and found to be active with a 25% hit rate. Strikingly, these de novo sequences are the shortest active peptides for infectivity enhancement reported so far and show no sequence relation to the training set. Moreover, by screening the chemical space, we discovered the first hydrophobic peptide fibrils with a moderately negative surface charge that can enhance infectivity. Hence, this ML strategy is a time- and cost-efficient way for expanding the chemical space of short functional self-assembling peptides exemplified for therapeutic viral gene delivery.
Photocatalytic collection and degradation of microplastics by self-asymmetric Pac-Man TiO2
Authors: Chattopadhyay Purnesh , Ariza Tarazona Maria Camila , Cedillo-Gonzlez Erika Iveth , Siligardi Cristina , Simmchen Juliane
Published: March 2023

Microplastics are a significant environmental threat as they are not regularly monitored or removed and the lack of efficient removal techniques further amplifies this crisis. In this direction and many other environmental remediation processes, photocatalytic micro/nanomotors hold vast potential to remove and degrade micropollutants. Unifying the different properties of a photocatalytic micromotor (self-propulsion, phoretic assembly with passive colloids and photocatalytic oxidation of contaminants), we present highly scale-able, inherently-asymmetric Pac-Man TiO2 particles that can actively collect and degrade polystyrene microplastics.
Comment on "On the origin of multihole oxygen evolution in haematite photoanodes"
Authors: Leng Wenhua , Zhang Shufeng , Gao Boyuan , Zhang Shuchi
Published: March 2023

The Article1 deals with the mechanism of oxygen evolution reaction (OER) on hematite photoanodes. The authors claimed that the OER rate or photocurrent density has a third-order (or power law) dependence on surface hole density. On grounds of this argument, they proposed a mechanism of multihole oxygen evolution and argued that the observed power law results from that the activation energy of key O-O bond formation step is weakly dependent on the surface hole coverage. We argue that the reaction order is one and the activation energy is inversely proportional to surface hole density. This debate may be beneficial to elucidate the actual mechanism of water photooxidation on the photoanode.
Mapping the Influence of Ligand Electronics on the Spectroscopic and Singlet Oxygen Sensitization Characteristics of Pd(II) Biladiene Complexes Bearing Phenyl-Alkynyl Groups at the 2- and 18-Postions
Authors: Martin Maxwell , Pham Trong-Nhan , Ward Kaytlin , Rice Anthony , Hertler Phoebe , Yap Glenn , Gilmartin Philip , Rosenthal Joel
Published: March 2023

Photodynamic therapy (PDT) is a promising treatment for certain cancers that proceeds via sensitization of ground state 3O2 to generate reactive 1O2. Classic macrocyclic tetrapyrrole ligand scaffolds, such as porphyrins and phthalocyanines, have been studied in detail for their 1O2 photosensitization capabilities. Despite their compelling photophysics, these systems have been limited in PDT applications because of adverse biological side effects. Conversely, the development of non-traditional oligotetrapyrrole ligands metalated with palladium (Pd[DMBil1]) have established new candidates for PDT that display excellent biocompatibility. Herein, the synthesis, electrochemical, and photophysical characterization of a new family of 2,18-bis(phenylalkynyl)-substituted PdII 10,10-dimethyl-5,15-bis(pentafluorophenyl)-biladiene (Pd[DMBil2R]) complexes is presented. These second generation biladienes feature extended conjugation relative to previously characterized PdII biladiene scaffolds (Pd[DMBil1]). We show that these new derivatives can be prepared in good yield and, that the electronic nature of the phenylalkynyl appendages dramatically influence the PdII biladiene photophysics. Extending the conjugation of the Pd[DMBil1] core through installation of phenylacetylene resulted in a ~75 nm red-shift of the biladiene absorbance spectrum into the phototherapeutic window (600-900 nm), while maintaining the PdII biladienes steady-state spectroscopic 1O2 sensitization characteristics. Varying the electronics of the phenylalkyne groups via installation of electric rich or poor groups dramatically influences the steady-state spectroscopic and photophysical properties of the resulting Pd[DMBil2R] family of complexes. The most electron rich variants (Pd[DMBil2N(CH3)2]) can absorb light as far red as ~700 nm but suffer from significantly reduced ability to sensitize formation of 1O2. By contrast, Pd[DMBil2R] derivatives bearing electron withdrawing functionalities (Pd[DMBil2CN] and Pd[DMBil2CF3]) display 1O2 quantum yields above 90%. The collection of results we report are suggest that excited state charge transfer from more electron-rich phenyl-alkyne appendages to the electron deficient biladiene core circumvents triplet sensitization. The spectral and redox properties, as well as the triplet sensitization efficiency of each Pd[DMBil2R] derivative is considered in relation to the Hammett value for each biladienes R-group. More broadly, the results reported in this study clearly demonstrate that biladiene redox properties, spectral properties, and photophysics can be perturbed greatly by relatively minor alterations to biladiene structure.