bluuebunny/crossref_metadata_2025 huggingface dataset:
Consequence of Project Integration Management Process on Success of Project In Ethiopia
Authors: Tesfaye Tegene , Kant Shashi
Published: October 2024

The objective of this investigation was to examine the consequences of the project integration management process on success of project in west guji zone road construction. This research employed descriptive and explanatory research design with quantitative and qualitative research approach. Both probability and non-probability sampling techniques were applied to select a sample of 250 respondents. From probability sampling stratified sampling and simple random were used to categorize heterogeneous people into strata. Also purposive sampling was used from non-probability. The primary data were collected through well-organized questionnaires. Data was analyzed using both descriptive and inferential analysis. Descriptive data was expressed by average, mean and standard deviation. Inferential data were analyzed by regression, association with the aid of statistical tool SPSS version 20. The finding of the investigation indicates that project initiation, project planning, and project closure have positive and significant consequence on project success. However, project execution, project monitor and controlling have positive and insignificant consequence. The researcher suggests that Dudgadewa and Melka soda districts have to give first for project initiation, project planning, and project closure to improve the success of road construction. Furthermore, other researchers have to conduct investigation by taking project execution and controlling in west guji zone.
The Influence of Financial Distress, Earnings Management, and Financial Performance on Firm Value with Good Corporate Governance as a Moderating Variable
Authors: Heling Pui , Lastanti Hexana Sri
Published: October 2024

This study examines the influence of financial distress, earnings management, and profitability on firm value, with good corporate governance (institutional ownership) as a moderating variable. Focusing on infrastructure sector companies listed on the Indonesia Stock Exchange from 2019 to 2023, this research employs Tobin's Q to measure firm value, the Altman Z-Score for financial distress, the modified Jones model for earnings management, and Return on Assets (ROA) for profitability. The findings reveal that profitability positively and significantly affects firm value, while financial distress and earnings management show no significant impact. Additionally, institutional ownership does not moderate the effects of financial distress and earnings management on firm value, though it successfully moderates the relationship between profitability and firm value. These results underscore the importance of profitability and good corporate governance in enhancing firm value, with implications for investor decision-making and corporate strategy in Indonesia’s infrastructure sector.
The Effect of Dividend Yield on The Volatility of Stock Prices of IDX30 Index Companies Listed on the Indonesia Stock Exchange for the 2019-2023 Period
Authors: Salsabila Salsabila , Hadady Hartaty , Jabid Abdullah W. , Amiro Suratno , Rusandry Rusandry
Published: October 2024

This study investigates the influence of Dividend Yield on Stock Price Volatility in companies included in the IDX30 index on the Indonesia Stock Exchange (IDX) during the 2019-2023 period. Utilizing secondary data from annual reports of IDX30 companies, panel data regression analysis was conducted to examine the relationship between the variables. The findings reveal that Dividend Yield positively affects Stock Price Volatility, contradicting the initial hypothesis. The results indicate that an increase in Dividend Yield leads to higher Stock Price Volatility, while a decrease in Dividend Yield results in lower Stock Price Volatility. This research provides valuable insights for investors in understanding the dynamics between dividend policies and stock price fluctuations.
On some tensors of six-dimensional Hermitian planar submanifolds of Cayley algebra
Authors: Banaru G. A.
Published: October 2024

In the present note, we consider six-dimensional Hermitian planar sub­manifolds of Cayley algebra. The almost Hermitian structure on such a six-dimensional submanifold is induced by means of so-called Brown — Gray three-fold vector cross products in Cayley algebra. The six-dimen­sio­nal Hermitian planar submanifolds of the octave algebra contain all six-dimensional Kählerian submanifolds of Cayley algebra. However, there exist non-Kählerian six-dimensional Hermitian planar submanifolds in the octave algebra. The components of the tensor of the Riemannian curvature for a six-dimensional almost Hermitian planar submanifold of Cayley algebra are computed. Remark that the tensor of Riemannian curvature plays a fun­damental role in geometry of almost Hermitian manifolds. Knowing all components of the tensor of the Riemannian curvature for a six-dimen­sio­nal almost Hermitian planar submanifold of the octave algebra, it is possible to study so-called Gray’s identities for this submanifold. The components of the Ricci tensor and of the tensor of conformal curvature (known also as Weyl tensor) for a six-dimensional almost Her­mitian planar submanifold of Cayley algebra are also computed.
Parallel transports in the connections of three types for cocongruence K(n-m)m
Authors: Belova O. O.
Published: October 2024

We continue to study the cocongruence of -dimensional planes us­ing the Cartan — Laptev method. In an -dimensional projective space , the cocongruence of -dimensional planes can be given by the following equations . Compositional clothing of a given cocongruence by fields of ()-planes : and points allows one to define connections of three types in the associated bundle. In the present paper, parallel transports of an analogue of Cartan plane are studied in the connections of three types. It is proved 4 theo­rems: 1. Parallel transport of the analogue of the Cartan plane in an arbitrary connection is freely degenerate, i. e., in general, there are no spe­cial transports of this clothing plane. 2. In the group connection of the first type, the parallel transport of an analog of the Cartan plane is connected degenerate, i. e., the plane will be fixed under parallel transport in this connection. 3. In the group connections of the second and third types, the parallel transport of the analogue of the Cartan plane is freely degenerate. 4. The analogue of the Cartan plane is transferred in parallel in a line­ar combination of the first type connection if and only if it is displaced in the plane .
Surprise Grizzly Bear Attack Prompts Closure of a Mountain in Grand Teton
Authors: Frey Erzsebet
Published: October 2024

Startling grizzly bear attack forces closure of a Grand Teton mountain, highlighting the need for caution in bear country and visitor safety.
What Do Armadillos Eat?
Authors: Frey Erzsebet
Published: October 2024

Curious about the eating habits of armadillos? You might be thinking, ‘Well, they’re just small mammals, so they probably eat the same thing as other small mammals, right?’ While it’s true that armadillos are mammals, their diet is far from ordinary. These fascinating creatures have a diverse range of food preferences, from insects and fruits to unexpected delicacies like carrion.
Top 10 Animals With the Lowest IQ
Authors: Frey Erzsebet
Published: October 2024

Wondering which animals possess the lowest IQ? Dive into the fascinating world of sloths, koalas, armadillos, and more to discover their unique adaptations.
Breeds of Eagles
Authors: Frey Erzsebet
Published: October 2024

Like a diverse tapestry woven with intricate patterns, the world of eagles presents a captivating array of breeds, each with its own majestic allure and fascinating characteristics. From the regal Bald Eagle soaring above the American wilderness to the mighty Golden Eagle commanding the skies with its piercing gaze, these awe-inspiring creatures have captured the imagination of humans for centuries.
Scorpions in Missouri
Authors: Frey Erzsebet
Published: October 2024

Peel back the layers of mystery surrounding Striped Bark Scorpions in Missouri, and prepare to uncover the surprising secrets lurking in their fluorescent glow.
Bobcat Vs. Cougar: the Main Differences
Authors: Frey Erzsebet
Published: October 2024

Unravel the mystery of bobcat vs. cougar with surprising distinctions that go beyond size and appearance – the truth may surprise you!
Fascinating Pet Birds That Can Talk
Authors: Frey Erzsebet
Published: October 2024

Have you ever pondered the idea of sharing your life with a pet that possesses the extraordinary ability to communicate through speech? It’s a tantalizing notion, isn’t it? The world of pet birds offers a plethora of captivating species renowned for their talent in mimicking human speech. From the highly intelligent African Gray Parrot to the charming and interactive Amazon Parrot, these avian companions possess an uncanny knack for language.
Eagle Varieties
Authors: Frey Erzsebet
Published: October 2024

Yielding to the fascination of eagles, discover the diverse world of over 60 species, each with unique adaptations and remarkable survival skills.
Light Skin Dog: Meme, Stare and Complete Guide
Authors: Frey Erzsebet
Published: October 2024

Bask in the captivating gaze of the Light Skin Dog meme and uncover the secrets behind its irresistible charm.
Bobcat Predators
Authors: Frey Erzsebet
Published: October 2024

Curiosity piqued? Ever wondered about the challenges faced by the bobcat, a formidable feline that roams the wilds? Step into the untamed realm where the bobcat encounters a host of predators, both from the natural world and the human domain. From its natural habitat teeming with coyotes, wolves, mountain lions, alligators, and fishers to the threats posed by human activities, the bobcat’s existence is riddled with danger.
Biology of Birds
Authors: Frey Erzsebet
Published: October 2024

Delve into the captivating world of bird biology, from their unique respiratory system to specialized skeletal structure, and be amazed by their fascinating adaptations.
Are There Wolves In Rhode Island?
Authors: Frey Erzsebet
Published: October 2024

Are you ready to unravel the mystery of wolves in Rhode Island? Like a hidden treasure waiting to be discovered, the presence of these elusive creatures has intrigued both locals and wildlife enthusiasts alike. While the state’s history tells a tale of wolves once roaming freely across its landscapes, their fate took a tragic turn with the rise of hunting.
Loner Animals
Authors: Frey Erzsebet
Published: October 2024

Fascinating creatures thrive in solitude, but what drives them to reject social bonds and how do they survive against all odds?
Wolf Color | Common & Rare Wolf Colors
Authors: Frey Erzsebet
Published: October 2024

Get ready to unravel the mysterious world of wolf colors, from common greys to rare hues, each holding a secret worth discovering.
Probabilistic research software project sustainability
Authors: Katz Daniel S.
Published: October 2024

(please cite this post as https://doi.org/10.59350/zme5j-0jp45) I previously wrote a blog post, “There’s no such thing as sustainable research software,” trying to be somewhat provocative. In it I wrote: However, after thinking about this a bit more, I don’t think this means we shouldn’t try.
PENYULUHAN PENTINGNYA KOMUNIKASI BAIK ORANG TUA DENGAN ANAK
Authors: Nur Wahyuning Sulistyowati  , Liana Vivin Wihartanti  , Farida Styaningrum  , Supri Wahyudi Utomo  , Elva Nuraina  , Andien Nugrahaningtyas  , Puspa Widya Ningrum
Published: October 2024

Tidak semua siswa PAUD, TK, dan SD Desa Sambirejo langsung diasuh orang tuanya melainkan pengasuhan diambil alih oleh nenek dan kakek di mana orang tuanya harus bekerja. Pertumbuhan psikologis anak berpondasi pada komunikasi orang tua dan anak, sehingga peran komunikasi sangat penting. Oleh sebab itu, tim pengabdian mengadakan penyuluhan penjelasan, sharing session pengetahuan dan pengalaman terkait pentingnya komunikasi baik orang tua dengan anak di Desa Sambirejo. Tiga tahapan dalam kegiatan pengabdian yaitu persiapan, pelaksanaan, dan evaluasi. Pentingnya kegiatan pengabdian ini dapat meningkatkan pemahaman orang tua siswa PAUD, TK, dan SD mengenai pentingnya komunikasi yang baik orang tua dengan anak sebagai upaya menghasilkan generasi cerdas yang berakhlak mulia.
Expanded geographic range of Acanthodactylus savignyi (Audouin 1827), a near-threatened lizard (Squamata: Lacertidae), with a new provincial record
Authors: Bouhissi Mayssara El , Dahmani Walid , Hammou Mohamed Ait , Chedad Abdelwahab , Eddine Sadine Salah
Published: October 2024

Acanthodactylus savignyi is one of Algeria's endemic and rare reptile species. A population of this species has been identified in a new locality within the Sidi Bel Abbes region in the Northwest of Algeria. This study provides a brief description of the species in this explored area, highlighting its ecological significance and potential conservation needs.
Influence of mindfulness on environmental satisfaction among young adults: mediating role of environmental identity
Authors: Javaid Zartashia Kynat , Khan Kamran , Kamran Muhammad , Aslam Sarfraz
Published: October 2024

This study aims to analyze the relationship between mindfulness, environmental satisfaction, and environmental identity of adults. A sample of 367 adults was recruited using convenient sampling, and data were collected through online surveys. A quantitative analysis was carried out with SMART PLS-SEM to explore the structural relationships between these variables. The results demonstrated that mindfulness is significantly correlated with both environmental satisfaction and environmental identity, with environmental identity serving as a significant mediator between mindfulness and environmental satisfaction. These findings suggest that individuals with higher levels of mindfulness tend to have greater environmental satisfaction and a more robust environmental identity. The study highlights  the importance of mindfulness in promoting environmental responsibility and suggests that mindfulness  can enhance adults' affinity with nature and pro-environmental behaviors. This research contributes to the current understanding of the psychological determinants of environmental attitudes and  behaviors, offering valuable insights for policymakers and practitioners aiming to foster environmental actions.
Language of emotions: Establishing connection with customers in tourism industries
Authors: Rellon Maricar P.
Published: October 2024

Establishing a deep connection to customers is crucial in the highly competitive tourism industry. Service providers in the tourism industry must be good expressive communicators in order to deliver a better product and enhance the customer’s experience. This qualitative study explores the significance of the 'Language of Emotions' in the tourism industry, including the use of empathy, emotional intelligence, and effective communication to comprehend and address the emotional requirements of consumers. Tapping twelve (12) frontline tourism industry workers with at least three years of experience and twelve (12) tourists who made six purchases of tourism-related goods in the previous two years totaling to 24 respondents via purposive sampling, results of this study implies that tourism industry professionals can use this language to develop unique experiences, cultivate client loyalty, and accelerate company expansion. Personalized service delivery, emotional engagement, and attentive listening are some strategies. The study also highlights the necessity of providing personnel with communication and emotional intelligence training. The usefulness and difficulties of applying the "Language of Emotions" are covered in the conclusion, along with suggestions for further study and use. For tourism industry experts looking to improve client satisfaction and loyalty through emotional connections, this research provides insightful information.
External green pressure, dynamic capability, and green innovation: The regulating effect of executive environmental attention
Authors: Lin Xiaofang , Su Wunhong
Published: October 2024

Aiming to investigate the mediating effect of green dynamic capability on external green pressure and green innovation, as well as the moderating effect of executive environmental attention on external green pressure and green dynamic capability, this study preferred a theory model with five hypotheses. A valid sample of 357 interviewees was investigated to test the proposed hypotheses, and structural equation modeling was utilized. In addition, external green pressures mostly have a significant impact on green innovation, the green dynamic capability as a mediator. Also, executive environmental attention moderates the relationship between external green pressure and green dynamic capabilities. The results offer unique contributions to the literature and some suggestions for practicing in manufacturing enterprises.
Tai Chi training: An effective method to enhance the oneness of mind and body in dance performance
Authors: Jiang Yayun , Abdullah Nur Qasdina Jeeta , Nordin Nordiana
Published: October 2024

Since the nineteenth century, the primary goal of university dance programmes has been to enhance students' dance skills, while the development of artistic expression has been neglected. Tai Chi training has been shown to be an effective method of exercising the mind and body to enhance perceptivity and body creativity. However, there is still less research on its impact in teaching dance performance in universities. Therefore, this study aims to address two fundamental questions: (1) How does Tai Chi training affect students’ perceptivity and creativity in dance performances? (2) What are the specific effects of enhanced perceptivity and creativity on the state of dance performance? In order to answer these questions, this study utilized a qualitative research methodology involving 43 dance students from Hunan Women's University in China. The research methodology included a 10-week Tai Chi training program at Hunan Women's University in Hunan Province, China, and semi-structured interviews with participants. The findings reveal how Tai Chi training enhances dance students' perceptivity and creativity in dance performance and explains its effectiveness on the state of oneness of mind and body in dance performance. This exploratory study provides preliminary evidence for understanding the impact of Tai Chi training on mind and body awareness in dance and provides a basis for incorporating more mind and body exercises into dance education in the future.
WC-Co Smart Cutting Tools With 3D Printed Embedded Thermocouples For Real Time Cutting Temperature Measurement
Authors: Guimarães B. , Marques F. , Fernandes C. M. , Figueiredo D. , Silva F. S. , Miranda G.
Published: October 2024

In the scope of Industry 5.0 applied to the cutting tools industry, the advent of smart cutting tools consisting in the integration of sensors in cutting tools to monitor, and thus help control and adjust in real time different aspects of a machining process, arises as a unique opportunity to achieve unprecedent levels of operational efficiency and productivity. Therefore, this work focuses on the incorporation of temperature sensors in WC-Co cutting tools for measuring cutting temperature, through the fabrication of 3D printed K-type embedded thermocouples by multi-material laser powder bed fusion. The thermocouples powder composition was prepared through high-energy ball milling and properly characterized to guarantee the characteristics for laser powder bed fusion. Validation in an industrial environment during turning of different alloys revealed that the developed 3D printed embedded thermocouples can measure precisely and accurately cutting temperature in real time, as well as withstand the demanding turning process.
Exploring Enhanced Productivity in Laser Powder Bed Fusion of Nickel-based super alloy IN718: Analysing Microstructure, Support-Free Printing, Surface Integrity, and Spatter Formation
Authors: Habelmann Fenja , Khademzadeh Saeed , Svanberg Arvid , Larsson Anna , Hosseini Seyed Behnam
Published: October 2024

While laser powder bed fusion (PBF-LB) technology holds significant promise for integration into industrial manufacturing workflows, it still faces challenges related to low production rates. Adjusting process parameters, such as increasing layer thicknesses and scanning speeds, proves effective and cost-efficient in enhancing productivity in the PBF-LB process. However, ensuring the retention of appropriate properties poses challenges, which necessitate further studies. Another obstacle arises from the elevated energy input required to accommodate increased layer thicknesses, leading to a higher level of spatters. This study examines the feasibility of enhancing productivity in PBF-LB for IN718 components using this approach, encompassing both bulk samples and inclined features. The investigation includes various material responses, including relative density, surface roughness, microstructure, and spatter formation. Optimal process parameters have been determined for different layer thicknesses, extending up to 120 μm, with corresponding adjustments tailored for downfacing surfaces.
Study Of The Nanoprecipitation Of Γ’ (Ni3Al) Phase In New Nickel-Based Alloy For Molten Salt Reactors
Authors: Delagnes Adrien , Hamann Clémence , Taché Olivier , Perrin Toinin Jacques , Bacroix Brigitte , de Carlan Yann
Published: October 2024

Nickel-based alloys are attractive materials for the nuclear industry and in particular for Molten Salt Reactors (MSR). They are especially considered for neutron reflectors or heat exchangers. These alloys have many advantages, such as high mechanical properties at high temperature, and good corrosion resistance in chloride salt. A new nuance for MSRs is being developed at CEA. This alloy is obtained after consolidation by SPS and/or by HIP treatment of powders obtained by atomization. To resist irradiation, it is necessary to carefully control the nanoprecipitation in the material. This paper aims to show that the use of different characterization techniques, and in particular Small Angle X-rays Scattering (SAXS), makes it possible to specify the thermo-mechanical treatments, suggested to obtain the desired state of precipitation in this new alloy.
Effects of Nickel Content and Sintering Methods on Microstructure and Micromechanical Properties of WC/Ni Composites
Authors: Besharatloo Hossein , Zegai Ahmed-Ameur , Fooladimahani Saghar , Chirico Caterina , Llanes Luis , Ferrari Begoña , Sanchez-Herencia Antonio Javier
Published: October 2024

The powder composition and sintering process significantly influence the microstructure, phase composition, and mechanical properties of WC-based composites. The precise control of both chemical composition and sintering conditions is crucial for tailoring these materials to meet specific requirements across diverse applications, such as cutting tools, wear-resistant components, and various industrial uses. The study comprehensively assesses: I) the impact of varying nickel content, and II) the influence of sintering methods, including conventional and Spark Plasma Sintering (SPS), on the final microstructures and mechanical properties of the WC/Ni composites. In doing so, two sets of WC/Ni composites (containing 5 and 10 vol% Ni) were sintered using SPS and conventional methods. The microstructural analysis included FESEM and XRD, while mechanical properties were evaluated at different length scales including Vickers hardness, and fracture toughness. This detailed examination contributes valuable insights for enhancing the microstructural design of WC/Ni composites.
Changes in Powder Surface Chemistry During Reuse of 316L in Powder Bed Fusion - Laser Beam
Authors: Kazi Sofia , Leach Lindsay , Hryha Eduard
Published: October 2024

Powder degradation during additive manufacturing poses a significant challenge for achieving optimal part quality as well as maximal powder feedstock utilization and hence economy and sustainability of the process. Stainless steel 316L is a widely utilized material in powder bed fusion – laser beam (PBF-LB) due to its excellent processability, good corrosion resistance and mechanical properties of the PBF-LB processed components. This study investigates the influence of 316L powder properties and powder reuse on the powder surface oxide chemistry and hence processability by PBF-LB. Changes in powder surface chemistry were studied by HR SEM and X-ray Photoelectron Spectroscopy in virgin and reused state. Results indicate that there is evident degradation in powder properties during powder re-use with increase in oxygen content in the powder, connected to increase in thickness of iron-base surface oxide layer as well as fraction of Cr-rich particulate oxide phases.
Application-Driven Intelligent Scan Patterns in Additive Manufacturing
Authors: Karimi Paria , Sadeghi Esmaeil
Published: October 2024

This study investigates the influence of novel scan patterns on the microstructure and hardness of γ-TiAl base alloy manufactured using the electron beam-powder bed fusion process. Different scan patterns were explored for their effects on thermal history and heat transfer, resulting in diverse microstructures from fully lamellar to duplex structures. As-built samples with varied scan patterns underwent hardness testing, elucidating differences in hardness qualities. The formation mechanisms of desired microstructures for each scan pattern were extensively examined. The findings provide a valuable framework for tailoring materials with specific microstructures and performance attributes by adjusting scan patterns during electron beam-powder bed fusion, with significant implications for future applications.
Microstructure And Compression Properties Of Cu-Graphite Composites Prepared Via Spark Plasma Sintering
Authors: Kovacik Jaroslav , Kołacz Dariusz , Lis Marcin , Kulasa Joanna
Published: October 2024

Mechanical properties of copper-graphite composites ought to be considered when designing their industrial applications in synergy with high electrical and thermal conductivity, low friction coefficient and coefficient of thermal expansion. Copper-graphite composites in range of 15-75 vol.% of graphite were densified using SPS technology at 900℃. Microstructures confirmed certain anisotropy for prepared composites. Random orientation is in cross section perpendicular to applied pressure, aligned graphite is in cross sections parallel to applied pressure. Compression properties: 0.2% yield stress, compression strength, reduction of height and modulus of elasticity were determined. Compression properties of copper-graphite system are nonlinear on composition, with increasing graphite volume fraction they are decreasing. Fracture surfaces were investigated: At 15 vol.% of graphite composite fracture is via ductile tearing, with increasing vol.% of graphite, intergranular fracture takes place. Some cleavage fracture paths are also partially observed. Finally, cross properties of compression properties to electrical conductivity were investigated.
Influence Of Cr/Ni Ratio On The Formation Of C14 Phases In A Ti7Nb6Cr(4-x)Ni(1+x)VAl Refractory High Entropy Alloy
Authors: Cornide Juan , Parra-Martínez Manuel , Cuenca-Fernandez Daniel , Frutos Emilio
Published: October 2024

Refractory Eutectic High Entropy Alloys (RHEAs) with body-centered cubic (BCC) single-phase structures have attracted extensive attention in hydrogen storage due to their unique structural characteristics and excellent performance. A general observation shows that BCC structures form more stable hydrides than Laves phase-based hydrides. In the present study, several Ti7Nb6Cr4-xNi(1+x)VAl (x=0,2) RHEAs obtained by high-energy mechanical alloying were investigated to understand the influence of the Chromium/Nickel ratio on the transition from BCC and C14 Laves phase into a single BCC phase. The research was conducted through SEM and X-ray diffraction analysis. Additionally, several thermodynamic parameters such as the enthalpy of mixing (ΔHmix), size difference (δ), valence electron concentrations (VEC), and electrons per atom ratio (e/a) have been correlated with the experimental data.
Suitable Laser Scanning Strategy for Producing Ti-4.7Mo-4.5Fe Alloy Using Laser Powder Bed Fusion
Authors: Mkhaliphi Thuli , Becker Thorsten , Madyibi Xola , Louw Louis
Published: October 2024

The study investigated the effect of the laser scanning strategy on the microstructural and material properties of the Ti-4.7Mo-4.5Fe alloy produced using laser powder bed fusion through in-situ alloying. The four scanning strategies used for the study were meander rotated at 45°, bi-directional alternating and rotated at 45° and 67° (Bi-45° and Bi-67°) and the Island. Cylindrical samples and tensile specimens, printed horizontally, were produced to investigate the microstructural and mechanical properties of the material, respectively. The study highlights and discusses the correlation between the amount of porosity, partially melted molybdenum, density, grain refinement, and the scanning strategies. The micro-hardness of the samples ranged between 451 and 484 HV with a minimum ultimate tensile strength (UTS) of 1000 MPa and minimum elongation% of 8%. The results showed that the Bi-45° and the Island laser scanning strategies are better suited for producing Ti-4.7Mo-4.5Fe alloy.
Increasing The Chemical Homogeneity Of In-Situ Alloying During Laser Powder Bed Fusion Of Metals By Targeted Raw Material Selection
Authors: Großwendt Felix , Hantke Nick , Benito Santiago , Sehrt Jan T , Weber Sebastian , Lentz Jonathan
Published: October 2024

With many commercially available alloys, powder bed fusion of metals using a laser beam (PBF-LB/M)\n results in the formation of defects such as cracks due to high cooling rates. To obtain a broader variety of starting materials suitable for PBF-LB/M and specific applications, mixing powders, so-called in-situ alloying, using a modular powder design set is a promising approach. Unfortunately, in-situ alloying promotes chemically inhomogeneous components. In this work, different powder mixtures were analyzed and processed to obtain a carbon steel of specified composition. The samples were microstructurally characterized using several methods and compared to a pre-alloyed reference. The chemical homogeneity is statistically evaluated employing first-order variograms. It was found that the composition of the individual raw materials is decisive for the homogenization within the melt pool. Large scale homogenization is also influenced by the amount of raw material added. By carefully selecting the raw materials, almost complete in-situ homogenization was achieved in PBF-LB/M
Influence Of Surface Modification Of Powders By Fluidized Bed On The Microstructure And Properties Of Parts Produced By Selective Laser Melting
Authors: Sandoval Neyder A. , Santos Villanueva Alejandro , Rams Joaquin , Torres Belén , Rodrigo-Herrero Pilar , Cifuentes Sandra C. , Tsipas Sophia A.
Published: October 2024

The improvement of beam-based additive manufacturing processes, such as selective Laser Melting (SLM) is currently generating industrial and scientific momentum because of the great advantages it offers in terms of design, flexibility, and efficiency. Although SLM is widely studied, it has certain disadvantages in part due to the limited availability of raw metal or metal-ceramic powders used, prone to processing issues like microstructural defect and low reproducibility. To partly address these challenges, in this work, powders were surface modified using a fluidised bed to improve the characteristics and processability and adapt them to the SLM using a scalable process. The modified powders were characterized by different techniques and the influence of the surface modification on their processability was analysed. In addition, the effect of printing parameters was investigated. Finally, the microstructure of parts obtained by SLM using the modified powders were studied.
مدى تضمين كتب الدراسات الاجتماعية للحلقة الثالثة لمرحلة التعليم الأساسي لمفاهيم المسؤولية الاجتماعية في الجمهورية اليمنية
Authors: الدروبي حليمة محمد عبده أحمد , الصلاحي عبد السلام محمد أحمد
Published: October 2024

هدفت الدراسة إلى معرفة مدي تضمين مفاهيم المسؤولية الاجتماعية في كتب الدراسات الاجتماعية للحلقة الثالثة لمرحلة التعليم الأساسي  في الجمهورية اليمنية، واستخدمت الدراسة المنهج الوصفي التحليلي بأسلوب تحليل المحتوى؛ حيث تكونت عينة الدراسة من كتب الدراسات الاجتماعية للحلقة الثالثة  لمرحلة التعليم الأساسية التي تشمل الصفوف (السابع  والثامن والتاسع)، البالغ عددها اثنا عشر كتابا بواقع أربعة كتب لكل صف دراسي، وتمثلت أداة الدراسة في بطاقة تحليل المحتوى التي تكونت من(5) مفاهيم رئيسة و(46) مفهوما فرعيا، وأسفرت الدراسة عن النتائج الآتية:

جاء ت مفاهيم المسؤولية الاجتماعية في محتوى منهج الصف الثامن في المرتبة الأولى (550) تكرارًا، وبنسبة قدرها (42.73%)، وهي درجة ضعيفة حسب فئة التقدير المعتمدة، يليه في المرتبة الثانية منهج الصف السابع بـ(392) تكرارًا، وبنسبة قدرها (30.45%)، وهي درجة ضعيفة أيضا، ثم منهج الصف التاسع في المرتبة الثالثة والأخيرة بـ(345) تكرارًا، وبنسبة قدرها (26.80%)، وهي كذلك درجة ضعيفة.
احتلت المسؤولية الذاتية المرتبة الأولى من بين مفاهيم المسؤولية الاجتماعية، حيث حصلت على (610) تكرارات، وبنسبة (47.39%) من إجمالي الكتب، تليها في المرتبة الثانية مفاهيم المسؤولية تجاه المجتمع بـ(328) تكرارًا، وبنسبة (48 .25%)، تليها في المرتبة الثالثة مفاهيم المسؤولية الوطنية بـ(158) بنسبة (12.27%)، ثم في المرتبة الرابعة مفاهيم المسؤولية البيئية بـ(123) بنسبة(9.55%) وأخيرًا في المرتبة الخامسة مفاهيم المسؤولية الأسرية بـ(68) بنسبة (5.28%)، وهي نسب ما بين ضعيفة جدًا وضعيفة؛ لذلك توصي الدراسة بضرورة تضمين مناهج الدراسات الاجتماعية هذه المفاهيم لأهميتها بالنسبة للفرد والمجتمع.
جهود فقهاء بني الأهدل في الفتاوى
Authors: الاهدل محمد شيبة قاسم
Published: October 2024

الحمد لله والصلاة والسلام على رسول الله وعلى آله وصحبه ومن والاه، أما بعد:
فإن هذا البحث يهدف إلى التعريف بجهود فقهاء بني الأهدل في الفتاوى, والمنهج المتبع في البحث هو المنهج الاستقرائي الوثائقي في التحقق من صحة هذه المؤلفات, ونسبتها إلى مؤلفيها، وتتبعت نسخ كل مؤلف, ومكان تواجده, وجمعت المعلومات عنها, وهل هي مخطوطة أم مطبوعة؟ ووثقت الاقتباسات و النقول من مواضعها، وذكرت ذلك في الحاشية.
اقتصر البحث على مبحثين المبحث الأول: التعاريف ومصطلحات الدراسة والمبحث الثاني: جهود فقهاء بني الأهدل في الفتاوى ونماذج من فتاويهم.
وقد جاء البحث لإبراز جهود أسرة علمية مشهورة بالعلم والفقه, والتعريف بهم وأشهر مؤلفاتهم في الفتاوى خاصة.
وقد خلص البحث إلى نتائج من أبرزها:
- أن أسرة آل الأهدل من أشهر الأسر اليمنية التي اشتهرت بالعلم والفقه عبر العصور.
- معرفة فقهاء بني الأهدل وجهودهم في الفتاوى.
وقد خلص البحث لمجموعة من التوصيات والمقترحات كما هو محرر في الخاتمة، أسأل الله أن ينفع به، وصلى الله وسلم على نبينا محمد وعلى آله وصحبه أجمعين.
فاعلية برنامج قائم على إستراتيجية التعليم المقلوب في تنمية مهارات التدريس لدى الطلبة المعلمين بقسم مناهج الدراسات الإسلامية في كلية التربية – صنعاء
Authors: اسماعيل حنان محمد عبد الله , المخلافي عبد السلام عبده قاسم
Published: October 2024

تهدف الدراسة إلى معرفة فاعلية برنامج قائم على استراتيجية التعليم المقلوب في تنمية مهارات التدريس لدى الطلبة المعلمين بقسم مناهج الدراسات الإسلامية بكلية التربية– صنعاء، ولتحقيق أهداف الدراسة تم استخدام المنهج الوصفي القائم على (أسلوب البناء والتطوير) في إعداد قائمة مهارات التدريس، وفي بناء البرنامج، السيناريو، وبناء بطاقة الملاحظة، والمنهج شبه التجريبي في تصميم التجربة "التصميم القائم على المجموعتين: التجريبية والضابطة"، بقياس قبلي وبعدي، وتكونت عينة الدراسة من (60) طالبًا وطالبة، تم اختيارهم بالطريقة العشوائية الطبقية وتم تقسيمها عشوائيًا إلى مجموعتين متساويتين ومتكافئتين: الأولى: تجريبية التي طبق عليها البرنامج القائم على التعليم المقلوب، والمجموعة الثانية: ضابطة، التي تعلمت بالطريقة المعتادة، نفذت التجربة على أفراد عينة الدراسة في الفصل الأول من العام الجامعي 2023/2024م، وأظهرت النتائج: وجود فروق ذات دلالة إحصائية عند مستوى (0.0001) بين متوسطي درجات أداء أفراد المجموعة التجريبية وأفراد المجموعة الضابطة في التطبيق البعدي لبطاقة الملاحظة، وكانت الفروق في اتجاه أفراد المجموعة التجريبية، وكذلك وجود فروق ذات دلالة إحصائية عند مستوى (0.0001) بين متوسطي درجات أداء أفراد المجموعة التجريبية في التطبيقين القبلي والبعدي لبطاقة الملاحظة، وكانت الفروق في اتجاه التطبيق البعدي، وحقق البرنامج القائم على استراتيجية التعليم المقلوب فاعلية كبيرة في تنمية مهارات التدريس لدى أفراد المجموعة التجريبية من الطلبة المعلمين بقسم الدراسات الإسلامية في كلية التربية صنعاء، إذ بلغت قيمة الكسب المعدل لحجم الفاعلية على مستوى الأداة ككل (1.4)، وهي قيمة أكبر من النسبة (1.2) التي حددها بلاك للفاعلية الكبيرة، وأوصت الدراسة بضرورة تطوير برامج إعداد معلمي التربية الإسلامية بكليات التربية لتتضمن استراتيجيات التعليم المقلوب، وتدريبهم على كيفية إعداد الدروس، وإنتاج الفيديوهات التعليمية ونشرها على شبكة الإنترنت وفقًا لهذه الاستراتيجيات التعليمية.
ملامح المجتمع اليهودي في ضوء آيات القرآن الكريم
Authors: مطهر أحمد محمد عبده
Published: October 2024

يهدف هذا البحث الموسوم بـ: (ملامح المجتمع اليهودي في ضوء آيات القرآن الكريم) إلى التعريف المركز والمختصر بالشخصية اليهودية ووهِمِ التفضيل المطلق، وبيان الموقف القرآني من اليهود في أبرز المعالم والسمات، ويظهر دور اليهود في صياغة المجتمع المعاصر، وقد تكون البحث من ثلاثة مطالب: كان الأول منها في التعريف بالشخصية اليهودية، والثاني في بيان الموقف القرآني من اليهود في أبرز المعالم، وكان الثالث في دور اليهود في صياغة المجتمع المعاصر، وقد استخدم الباحث مناهج البحث: الاستقرائي والوصفي والتحليلي حسب ما تستدعيه طبيعة البحث، وقد خلص الباحث إلى جملة من النتائج من أهمها: أن النفسية اليهودية نفسية حريصة مليئة بالأمراض النفسية ومشاعر النقص وملبدة بالأحقاد والأنانية والكراهية، وأن جنس اليهود من أكثر البشر تمرداً على شرائع الله تعالى السماوية، وهم وراء كل فساد عقائدي أو أخلاقي أو قيمي أو غيرها عبر التاريخ، وأن القرآن الكريم قد تكفل بفضحهم وإفساد صنعتهم، ومن تتبع ذلك عرف، وأن اليهود بكل صفاتهم الخبيثة هم اليهود عبر الزمان والمكان والعصور والأعوام لا يختلف بعضهم من بعض، كما وصل الباحث إلى مجموعة توصيات ومقترحات مدونة في آخر البحث.
مدى تضمين معايير العلوم للجيل الثاني (NGSS) في كتاب الكيمياء للصف العاشر من المرحلة الثانوية في الجمهورية اليمنية
Authors: السريحي حُنين محمد يحيى , الأشموري خالد علي عبده
Published: October 2024

هدفت الدراسة الحالية إِلى معرفة مدى تضمين معايير العلوم للجيل الثاني (NGSS) في كتاب الكيمياء للصف العاشر من المرحلة الثانوية في الجمهورية اليمنية؛ إذ أعدد الباحثان قائمة معايير العلوم للجيل الثاني NGSS، في تخصص العلوم الفيزيائية، ومُؤشراتها المُقترحة، لمجال المادة وتفاعلاتها، وقد اتبعَّت الدراسة المنهج الوصفي التحليلي؛ لأنه المنهج الذي يتناسب مع طبيعة الدراسة ومع أهدافها، وتكوَّن مُجتمع الدراسة من كتاب الكيمياء، وكتيب الأنشطة والتجارب المُختبرية للصف العاشر من المرحلة الثانوية في الجمهورية اليمنية،، وشملت عيِّنة الدراسة على نسبة (100 %) من مُجتمع الدراسة، وتمثلت أداة الدراسة في هذه المرحلة بأداة تحليل المحتوى.
وقد توصلت الدراسة إِلى النتائج الآتية:

تكونت قائمة معايير العلوم للجيل الثاني NGSS، ومُؤشراتها المُقترحة، لمجال المادة وتفاعلاتها، من (8) معايير، و(24) بُعدًا، و(29) محورًا، و(32) محكًا، و(409) مُؤشرًا.
وُجِّد أنَّ إِجمالي مُتوسط مدى تضمين معايير العلوم للجيل الثاني NGSS، لمجال المادة وتفاعلاتها، في محتوى كتاب الكيمياء، وكتيب الأنشطة والتجارب المُختبرية؛ للصف العاشر من المرحلة الثانوية في الجمهورية اليمنية، يُساوي (83)، وبدرجة تضمين مُنخفضة.

وفي ضوء حدود مشكلة الدراسة وأسئلتها وأهميتها ونتائجها؛ فإِنَّ الدراسة قد خرجت بمجموعة من التوصيات، أهمها: الاطلاع على تجارب الدول التي سبقتنا، وبالذات التجربة الأمريكية؛ لأنها لخصت تجارب 25 سنة من العمل مع المعايير التربوية، كما تقترح الدراسة إِجراء عدد من الدراسات والبحوث؛ استكمالًا لجوانب الدراسة الحالية.
On the Way to a European Defence Union
Authors: Moser Carolyn
Published: October 2024

Is the EU on the path to a European Defence Union? Previously seen as militarily insignificant, the EU’s defence landscape is rapidly evolving in the wake of Russia’s invasion of Ukraine. This post explores how EU defence is changing in terms of aims, actors, and activities. It shows that the EU has left its comfort zone as a normative power to get ready for the geostrategic challenges of our time.
A 486 Billion Dollar Investment
Authors: Seidl Leon
Published: October 2024

The Russian war of aggression against Ukraine has caused not only untold human suffering, but also immense damage to Ukraine’s physical, economic and social infrastructure. This contribution highlights the leading role of the European Union in coordinating international assistance for the reconstruction of Ukraine and its implications for the Union’s capacity to be a global player in peacebuilding and crisis management.
A Leap Forward for Biodiversity Litigation
Authors: Hildt Laura
Published: October 2024

On 23 October, 2024, BUND (Friends of the Earth Germany) and several individuals filed a constitutional complaint mirroring the Neubauer case, but directed at the biodiversity crisis. The claimants seek a declaration from the Federal Constitutional Court (FCC) that the lack of a coherent scheme for the protection of biodiversity infringes fundamental rights and seek an order from the court for the legislature to take the necessary measures to adopt an appropriate, legally binding protection scheme within a clear timeline. This case presents a significant development in the field of strategic biodiversity litigation as the first systemic government framework case. It can be seen as the Urgenda of biodiversity litigation.
الخلط في مفاهيم المصطلحات الاجتماعية في الأبحاث والدراسات العربية مقاربة نقدية
Authors: الأستاذ  الدكتور  عبد الرحمن  بن محمد  عسيري
Published: October 2024

هدفت هذه الدراسة إلى تقديم نماذج لبعض المصطلحات الاجتماعية المستخدمة في البحث الاجتماعي، بما في ذلك المصطلحات البحثية والمفاهيمية، حيث لوحظ وجود تباين وخلط في استخدامها في عدد من الأبحاث والدراسات العربية. تم في هذه الدراسة تتبع تلك المصطلحات ومناقشتها وتحليلها من خلال مقارنة المصطلح بنظيره في اللغة الأصلية، وتوضيح أوجه التحريف والتعديل التي طرأت على المصطلح من قبل بعض الباحثين في المجتمع العربي. وخلصت الدراسة إلى أن عدداً غير قليل من المصطلحات الاجتماعية قد تعرض للخلل نتيجة الترجمة غير الدقيقة أو التباين في فهم المصطلح، أو تعمد تحريفه لتحقيق أهداف فكرية أو عقائدية.
الرؤية الفلسفية للحركة والسكون وعلاقتهما في التصوير
Authors: د. غدير محمد عفيف
Published: October 2024

يلقي البحث الضوء على الرؤية الفلسفية للحركة والسكون وعلاقتهما في التصوير، والتعرف على مفهوم الحركة والسكون وأنواعهما في المجالات المختلفة، والافادة من علاقتهما في جعل العمل التصويري الساكن متحرك والمتحرك ساكن، ولخصت مشكلة البحث في امكانية الاستفادة من مفهوم الحركة والسكون وعلاقتهما في جعل العمل التصويري ساكن ومتحرك في آن واحد. ويهدف البحث إلى الاستفادة من مفهوم الحركة والسكون وعلاقتهما في إثراء القراءة البصرية للأعمال التصويرية. والكشف عن القيم الجمالية والمعنوية في العلاقات المتناقضة والمتداخلة للحركة والسكون لتحقيق رؤية فنية جديدة للعمل التصويري. ويتبع البحث المنهج الوصفي التحليلي في وصف وتحليل أعمال الفنانين في القرن العشرين. ولخصت اهم نتائج البحث أن الاستفادة من مفهوم الحركة والسكون وعلاقتهما تساهم في تحقيق رؤية فنية جديدة تجعل العمل التصويري ساكن ومتحرك في آن واحد. والتعرف على مضامين العلاقات الفلسفية بين الحركة والسكون تثري القراءة البصرية للأعمال التصويرية. كما توصي الباحثة بدراسة التصورات الحركية والسكونية في أعمال الفنانين المعاصرين لإثراء مجال الفن بشكل عام والتصوير بشكل خاص. وضرورة التعرف على المضامين الفلسفية لمفهوم كلاَ من الحركة والسكون في الفن المعاصر للخروج برؤية فنية جديدة.
نظام الحكم في الخلافة العباسيّة في ظل النّفوذ التّركي(232-334هـ/847-946م)
Authors: د. عادل أحمد ملحم
Published: October 2024

لعب الأتراك دوراً كبيراً في الحياة السياسية في العصر العباسي الثاني، وقد أسهمت الظروف لبعض القادة الأتراك إلى توسيع نفوذهم، وكان أهمها ركود العمليات العسكريّة وقيام الخليفة المعصم بالله بإبعاد القادة العرب مما شجّع هؤلاء القادة إلى المسير نحو المقدّمة وتبوّؤ مراكز عسكرية مهمة سمحت لهم بالتدخل في مختلف شؤون الدولة، بما فيها القضايا السّياسيّة المهمّة والحسّاسة.
ففي الجانب الإداري يستعرض التنظيمات الإداريّة ابتداء من المؤسسة الكبرى وهي الخلافة مرورًا بالوزارة، وقيادة الجيش والدواوين وصولًا إلى البريد والشرطة فقد وضع الأتراك بصمتهم في جميع الإدارات حتى إنّهم تدخلوا في تنصيب الخليفة وخلعه.
ويبيّن جوانب الاستغلال الّتي قام بها بعض الولاة فقد سوّلت لهم أنفسهم بناء دويلات مستقلة عن الخلافة كالدولة الطولونيّة والإخشيديّة في مصر والدويلات الانفصاليّة في الشرق فأصبحت الخلافة أشبه بمحموعة ولايات يحكمها الخليفة، وفي الفترات الأخيرة من فترة النّفوذ التّركي نجد أن الخليفة لا سلطة له، وخاصة في عصر إمرة الأمراء، فبات لا يحكم سوى بغداد وجوارها، وباتت سلطته دينية فقط.
 كما يظهر جميع المراكز أو العواصم الّتي اتخذها الخلفاء كحاضرة لحكمهم، والّتي بنوها نتيجةً لضروراتٍ معينةٍ وأن أغلبية هذه العواصم كانت بدافع الضرورات، فمن إنشاء سامراء والّتي تعدُّ عاصمة الخلافة زمن النّفوذ التّركي والّتي جمعت الجند والقادة والأبناء منهم فأصبح الخليفة وكأنه ضيف على ساحتهم واستغلوا هذه الفرصة فزادوا من نفوذهم عليه، الأمر الّذي دفع المتوكل إلى مغادرتها قاصدًا دمشق، ثم إصراره بعد عودته إلى العراق على بناء المتوكلية كعاصمة جديدة لحكمه والابتعاد عن الأتراك وشرّهم.
El Agave en México: su aplicación como adsorbente para la remoción de contaminantes en el agua
Authors: Franco Mota Rubi Itzel , Rodríguez-Rosales Maria Dolores Josefina , Martínez-Roldán Alfredo de Jesus , Martínez Gómez Víctor Jésus , De la Peña Arellano Armando , Contreras Hernández María Gorety
Published: October 2024

En México, la contaminación de agua por metales pesados se ha convertido en un problema grave de salud pública, por lo que, ante la preocupación de dicha problemática, los investigadores se han centrado en la búsqueda de materiales accesibles y de fácil preparación para su uso como bioadsorbentes para su remoción. La biomasa, en particular derivada de subproductos agroindustriales se han estudiado en gran variedad, debido a que estudios han demostrado que este tipo de residuos cuentan con componentes básicos de polisacáridos tales como lignina, celulosa y hemicelulosa, asimismo presenta grupos funcionales que les confieren la capacidad de adsorber elementos tóxicos presentes en el agua. Entre estos residuos agroindustriales se encuentran las hojas y bagazo de agave procedentes de la etapa de jimado y fermentación del proceso de elaboración de mezcal, dichos residuos se encuentran en gran disponibilidad, debido a que la producción del mezcal es la actividad agroindustrial más importante de México, pues la riqueza y distribución de agave en México con más de 215 especies ha permitido su aprovechamiento por ejidatarios, pequeños y grandes productores de mezcal. Contribuyendo en una generación de más de 250 millones de toneladas de estos residuos en los últimos años. El objetivo de esta revisión es proporcionar información sobre la aplicación de los residuos de agave como medios adsorbentes para la remoción de contaminantes en el agua. Aprovechando la economía circular de estos residuos, se busca mejorar la calidad del agua de manera sostenible.
POTENSI PENGGUNAAN SOFTWARE 3D DALAM PEMBELAJARAN 2D ANIMASI
Authors: Kastawa I Wayan Kalani Kekai
Published: October 2024

The use of 3D software in learning 2D animation offers a new approach that can improve the efficiency and quality of the learning process. This article aims to explore the potential of using 3D software in teaching 2D animation concepts in an educational environment. In traditional methods, 2D animation is generally learned through manual processes that require a deep understanding of frame-by-frame drawing and drawing techniques. However, with the development of 3D technology, software such as Blender, Maya, and Cinema 4D can be used to make 2D animation easier by using more efficient techniques such as rigging and pose-to-pose. This study was conducted using a qualitative approach through interviews with animation lecturers and practitioners, as well as observations of animation classes in several educational institutions. The results show that the use of 3D software in learning 2D animation can reduce production time, improve students' understanding of the basic principles of animation, and expand technical skills relevant to the modern animation industry. With the integration of 3D software, students can develop 2D animation skills while learning the basics of 3D modeling and animation, thus increasing their flexibility and competitiveness in the job market. This research recommends the use of 3D software as part of the 2D animation curriculum in educational institutions as an effective and innovative alternative.