Attractive Potential Research Articles

Gas-Phase Scattering of Transition Metal Atoms Fe, Ir, and Pt with CH4, O2, and CO2.

Understanding the interactions between transition metal atoms and molecules is important for the study of various related chemical and physical processes. In this study, we have investigated collisions between iron (Fe), iridium (Ir), and platinum (Pt) and the small molecules CH4, O2, and CO2 using a crossed-beam and time-sliced ion velocity map imaging technique. Elastic collisions were observed in all cases, except for collisions of Pt with O2 and CO2. Collisions of Fe or Ir with CH4, O2, and CO2 show mainly long-range attractive potentials at large impact parameters leading to forward scattering, whereas sideways and backward scatterings indicate the formation of short-lived complexes with lifetimes comparable to their rotational periods. In collisions of Pt with O2 and CO2, Pt may react with the gases and become chemically bound to them, which can deplete the nonreactive scattering signal. The insights gained from this study provide a foundation for improved understanding of the complex interactions between transitional metal atoms and other molecules.

OPTIMALISASI PEMANFAATAN VIDEO SEBAGAI ALAT PROMOSI UNTUK MENINGKATKAN POPULARITAS DESA WISATA BAKAS, KLUNGKUNG

The digitalization 5.0 nowdays needs to be studied in order to adapt with the tourism developments over time, including in the promotion sector. One of the developing tourism village is Bakas. Bakas Tourism Village has taken advantage of existing digitalization opportunities by promoting its potential attractions through Instagram social media. Bakas Tourism Village which located in Klungkung district, is a tourist village that has the potential for natural, culinary and spiritual tourist attractions. It is important to maximize the use of social media, to promote the various attractions of Bakas Tourism Village. The aim of this program was to help the stake holders in Bakas Tourism Village to carry out promotions on social media, by editing videos and photos using the features offered to edit in various social media. The results of this training were; (1) Developing business social media account, (2) Uploading photos of that have been edited using various editing features, (3) Uploading videos by adding interesting filters, captions and songs. In conclusion, these three outputs can make the products they offer more attractive before uploading them to social media accounts.

Improved Point-of-Care Mass Spectrometry Analysis with Thin-Layer Chromatography-Based Two-Dimensional Separation and Spray Ionization.

Point-of-care testing (POCT) involves administering rapid on-site analysis to provide fast biochemical testing results. POCT reduces delays in clinical decision-making and eliminates the need to transport and prepare clinical samples for immediate diagnosis or clinical intervention by healthcare professionals. Herein, a novel methodology integrating thin-layer chromatography-based two-dimensional separation with miniature mass spectrometry was developed for rapid on-site clinical analysis. As a proof-of-concept demonstration, γ-aminobutyric acid, 2-hydroxyglutarate, and N-acetyl-l-aspartic acid, which are widely known as biomarkers for brain gliomas, were selected as model analytes for method development and validation. The proposed approach exhibited satisfactory analytical performance, with 1 ng/mL limits of detection, 2 ng/mL limits of quantitation, and recoveries in the range of 85.9-107.2%. Additionally, on-TLC derivatization and reactive spray ionization strategies were utilized to enhance the mass spectrometric signals compared to underivatized analysis. This method was applied to analyze clinical samples, showcasing its attractive potential outside the laboratory.

Quasiclassical approximation does not have to be applied to all degrees of freedom: the solution for the S-states of singular attractive potentials

For the spherically symmetric potentials V(r), the quasiclassical approximation (QA) usually is applied as follows. For the φ-motion, the QA is not applied: instead, the exact solution is used. The QA is then applied to both the θ-motion and the r-motion. The resulting QA wave function for the θ-motion is valid for some, but not all values of θ. Besides, the resulting QA wave function for the θ-motion is valid only with the substitution of L(L+1) by (L+1/2)2, where L is the angular momentum quantum number. Then the QA is applied to the r-motion, but again with the substitution of L(L+1) by (L+1/2)2 in the centrifugal energy term. As a result of the above standard procedure, the obtained QA wave functions are valid only for (L + 1/2) greater or of the order of N1/2, where N is the principal quantum number. Besides, for potentials having the pole of the order 3 or higher at r = 0 or for relatively large r, it would be preferable to have L(L + 1) without the substitution by (L+1/2)2. This is yet another restriction of the QA validity in this procedure. In the first part of the present paper, we provide a better alternative. This alternative can also be applied to some potentials whose geometrical symmetry is not spherical. In the second part of the present paper, we focus on the attractive singular spherically-symmetric potentials V(r) =-an/rn, where an > 0 and the integer n > 2. They are encountered in many physical systems. There exists a paradigm that “singular attractive potentials do not lead to physically reasonable results” because eigenfunctions depend on the chosen cutoff at small r. In the present paper we disprove this paradigm. We demonstrate that while the unnormalized eigenfunctions of singular attractive potentials do depend on the cutoff at small r, there is no such problem for the corresponding normalized eigenfunctions. Namely, the normalized eigenfunctions, corresponding to any two different sufficiently small cutoffs (all other parameters being the same), are equal to each other or differ just by the sign. The sign difference does not affect the probability density: the latter is invariant to the variations of the cutoff. Thus, we prove that singular attractive potentials actually do lead to physically reasonable results. In doing so, we also demonstrated that a divergent integral can lead to physically meaningful results independent of the cutoff. This is a counterintuitive result of the importance from the fundamental point of view both for physics and mathematics.

Physicochemical Analysis of Dyeing of Cotton Denim with Natural Indigo Dye from Strobilanthes cusia Using Green Reducing Agents and Alkalis

Strobilanthes cusia is one of many indigo-producing plants with promising and attractive potentials as an alternative source of natural indigo dye due to its dyeability to cotton fibres with high colour strength, and due to its ease of cultivation. The aim of this research was to utilise natural indigo dye from Strobilanthes cusia to dye cotton denim fabric in an environmentally friendly way. The use of D-fructose and D-glucose as well as rice husk ash and lime solutions as reducing agents and alkali sources was explored in this study. The dyeing process was carried out at 30 °C for 30 minutes, followed by the oxidation process in open air for 45 minutes. Colour characteristics and fastness to washing and rubbing were evaluated. The results showed that D-fructose resulted in a higher colour strength than D-glucose, and that lime is better than rice husk ash and even sodium hydroxide in terms of colour strength. The highest colour strength was obtained from the combination of D-fructose and lime solution, with K/S and SUM(K/S) values of 16.02 (at 650 nm) and 8.5 respectively. The colour fastness to washing and rubbing was good for all dyed fabrics, with the staining scale ranging from 3/4 to 4. These results bring a new potential for natural indigo dye from Strobilanthes cusia beyond its current and limited use by traditional dyers to a much larger scale of denim dyeing for an eco-friendly fashion industry.

Stripe and bubble ratchets on asymmetric substrates

We show that various nonmonotonic ratchet effects can arise when mesophase pattern-forming systems, which exhibit anisotropic crystal, stripe, and bubble regimes, are coupled to one-dimensional asymmetric substrates under ac driving. The patterns emerge in the absence of a substrate when the ratio of attraction to repulsion is varied for particles with competing short-range attraction and long-range repulsion potentials. In the presence of the substrate, we find that the ratchet efficiency varies nonmonotonically with increasing attraction, depending upon how well the mesophase morphology matches the substrate spacing and periodicity. For strong repulsion, there is a weak but finite ratchet effect, while at intermediate attraction, there is a robust ratchet effect in which the system forms stripes aligned with the substrate symmetry direction. For strong attraction, large bubbles appear that have weak or no ratchet effects when the bubble width exceeds the substrate lattice spacing, causing the bubble to be only weakly coupled to the substrate. For very strong attraction, small bubbles form and undergo a strong ratchet effect with an efficiency that oscillates as a function of ac drive amplitude. Although the small bubble regime is a strongly correlated regime in which each bubble contains many particles, the system behaves as if it is in a single-particle regime since the bubble width is much smaller than the substrate lattice spacing. We map out the different rectification phases as a function of the pattern morphology, substrate strength, and ac drive amplitude. The pronounced ratchet effects that we observe in some regimes can be exploited for pattern sorting in hard and soft matter systems. Published by the American Physical Society 2024

Primary care in rural areas: a qualitative study on medical students’ images and experiences of working in rural areas in southern Germany

BackgroundRural areas are increasingly moving back into the focus of social research, especially in the context of health care. As the shortage of general practitioners (GP) in rural areas is a significant challenge in Germany, there are several programs to counteract underuse effectively, acutely, and sustainably. One of those programs is ’Beste Landpartie Allgemeinmedizin’ (BeLA), which was developed to strengthen primary care in rural areas and to sustainably promote young doctors to work as general practitioners in rural regions through didactical and financial support. The program includes an accompanying qualitative study exploring the motivational structures of medical students from a sociological perspective. For this study, the nexus of working in rural areas from the perspective of medical students with different forms of rural experiences was of interest.MethodsQualitative interviews have been conducted at regular intervals on an ongoing basis since 2020 to investigate motivational retention effects during the program. The current 33 interviews were analysed using the sociological conceptual framework of spatial methods.ResultsThe images and experiences of working in rural areas condition medical education in various ways. In addition to general images of living and working in rural areas in a biographical dimension, the idea of working as a GP in rural areas includes images of specific medical competencies and is conditioned by different medical tasks. From such a perspective, the images and attributions of working in primary care in a rural region demonstrate particularities, challenges, and the potential attractiveness of working in rural regions.DiscussionThe images and experiences of rural areas condition medical education in various ways and shape the expectations and the decision-making of possibly working in rural areas. The particularities, opportunities, and challenges of working in rural areas, which relate to both professional aspects and social life, are a major factor in the attractiveness of a potential rural practice. Didactical and educational curricula need to adapt the various attributions of working in rural areas.

STRATEGI PENGEMBANGAN OBJEK WISATA PANTAI PENIMBANGAN KABUPATEN BULELENG

The development of beach tourism can be utilized to encourage positive changes to the community's economy through employment opportunities, increasing income, and improving the quality of life of the community. This research was conducted at Penimbangan Beach, Bakti Seraga Village, Buleleng District. The potential attractions of Penimbangan Beach are diving, beach recreation, and swimming. Data collection to determine the condition of beach tourism through the carrying capacity of the area and development strategies carried out in February 2024. This study aims to determine the carrying capacity of the tourist attraction area and tourism development strategy of Penimbangan Beach. The method used is descriptive method with qualitative and quantitative approaches, and data analysis using SWOT analysis and DDK calculation. Based on the calculation of DDK on three tourist activities, namely diving as many as 2 people / day, beach recreation as many as 202.88 people / day, and swimming 30.72 people / day. The results of the SWOT analysis obtained an aggressive strategy, namely increasing visitor comfort while conducting tourism activities and preserving nature by educating visitors about the importance of maintaining cleanliness, increasing promotion through information media such as websites, videos, brochures, posters containing information about the beauty of the underwater and the benefits of black sand, adding facilities and infrastructure to increase the interest of tourist visits, and building tourism facilities.

Improving the Stability and Anti-Infective Activity of Sea Turtle AMPs Using Multiple Structural Modification Strategies.

Antimicrobial peptides (AMPs) are regarded as promising candidates for combating antimicrobial resistance. Previously we identified an AMP named Cm-CATH2 from the green sea turtle, which exhibited potent antibacterial activity and attractive potential in application. However, natural AMPs including Cm-CATH2 frequently suffer from structural instability and sensitivity to physiological conditions, limiting their effectiveness. Herein, we explored various strategies to enhance the efficacy and stability of Cm-CATH2, including peptide truncation, non-natural amino acid substitutions, disulfide bond-based cyclization, and stapled peptide techniques. The results demonstrated that the truncated NCM4 significantly improved the antimicrobial capability of Cm-CATH2 while also enhancing its anti-inflammatory and antibiofilm activities with minimal cytotoxicity. Further ornithine-substituted peptide oNCM markedly enhanced the stability of NCM4 without compromising its antimicrobial efficacy. This study successfully designed a lead peptide oNCM with significant development potential, while providing valuable insights into the advantages and limitations associated with diverse strategies for enhancing the stability of AMPs.

The C-X-C Motif Chemokine Ligand 5, Which Exerts an Antioxidant Role by Inducing HO-1 Expression, Is C-X-C Motif Chemokine Receptor 2-Dependent in Human Prostate Stroma and Cancer Cells.

While the C-X-C motif chemokine ligand 5 (CXCL5) is recognized as an inflammatory mediator and a potent attractant for immune cells, its functions within the human prostate remain unclear. This study explored the expression, functions, and regulatory mechanisms of CXCL5 in prostate stroma and cancer cells. CXCL5 secreted from prostate cancer cells enhanced neutrophil migration. CXCL5 induced cell proliferation and invasion of prostate cancer cells in vitro and tumorigenesis in a xenograft animal model. C-X-C motif chemokine receptor 2 (CXCR2) has been identified on the surface of prostate fibroblasts and cancer cells. The supernatant of LNCaP cells or CXCL5 overexpression enhanced the migration and contraction of prostate myofibroblast WPMY-1 cells; however, pretreatment with SB225002, a CXCR2 inhibitor, can reverse these effects. CXCL5 evinces antioxidant properties by upregulating heme oxygenase-1 (HO-1) to counteract H2O2-induced reactive oxygen species (ROS) in a CXCR2-dependent manner in WPMY-1 and prostate cancer cells. Our findings illustrate that CXCL5, through HO-1, plays a role in antioxidation, and determine that the CXCL5/CXCR2/HO-1 pathway facilitates antioxidative communication between fibroblasts and cancer cells in the prostate. Therefore, targeting the CXCL5/CXCR2 signaling pathway could provide a new strategy for managing oxidative stress within the prostate.

Assessing consumer perceptions of sustainable packaging solutions

ABSTRACT Consumer concerns about food and plastic packaging waste have led government and industry to seek alternatives prioritizing the environment while keeping safety, quality, shelf-life, and price. These consumer concerns were examined with a focus on fabrication technologies, current and proposed applications, and consumer acceptance of edible coatings, biodegradable packaging, and nanomaterials. A survey (N = 441) analyzed responses by subpopulations (generation, location, education level, and food-related careers). Consumers prioritize quality (95%), price (83%), and nutritional value (74%), but willingness to consume and pay extra for them varied by generation and location. Younger consumers showed openness to new technologies, indicating an attractive potential niche market for edible coatings. Positive comments highlighted environmental, health, and shelf-life benefits, while concerns include aversion towards new technologies and health risks. Biodegradable packaging is widely accepted, presenting business opportunities to meet sustainable demands, though cost and quality worries remain. Addressing these concerns is crucial for broader adoption.

Pendampingan Penguatan Branding dan Digital Marketing pada Desa Wisata Lembah Winden Wonosalam

The tourism sector has great potential in driving economic growth, including through the development of tourism villages. However, challenges such as duplication of models, lack of standardization, and low maintenance of infrastructure often hinder optimization. Winden Valley Tourism Village in Wonosalam, Jombang, has attractive natural tourism potential but has not been maximized. To overcome these obstacles, assistance was provided that focused on branding and digital marketing strategies. The assistance includes the utilization of social media, website development, and the use of mobile cashier applications to improve service efficiency. The methods used include proposal preparation, observation, brainstorming, and evaluation through pre-test and post-test. The results of the mentoring showed a significant increase in the knowledge and skills of business actors. The initial pre-test score of 60 increased to 105 in the post-test. With the right branding strategy and digital technology support, Winden Valley Tourism Village is expected to increase its visibility as a tourist destination and encourage local economic growth.

Upaya Peningkatan Potensi Obyek Wisata Unggulan Di Kota Banjarbaru

Banjarbaru City, Indonesia, holds significant potential in the tourism sector with a variety of attractions. Although some are not widely known, this research focuses on enhancing the potential of key tourist attractions in the city. Supporting and hindering factors for the success of these attractions are identified, including a lack of interest in human resource training, the impact of a hot climate on visitor experiences, limited collaboration with the local community, misunderstandings between managers and the tourism department, insufficient promotion, inadequate facilities and infrastructure, and budget constraints. The study emphasizes that investing in infrastructure maintenance, utilizing cutting-edge technology, intensive promotion, close collaboration with the private sector and local community, effective communication, regular training, and full support from the local government can enhance the prominence of tourist attractions. By addressing these obstacles and implementing the recommended efforts, the development of key tourist attractions in Banjarbaru City is expected to achieve better results.

LDOS of electron pair and the role of the Pauli exclusion principle

The local density of states (LDOS) for a pair of non-relativistic electrons, influenced by repulsive Coulomb forces, is expressed in term of one-dimensional integrals over Whittaker functions. The computation of the electron pair's LDOS relies on a two-particle Green's function (GF), a generalization of the one-particle GF applicable to a charged particle in an attractive Coulomb potential. By incorporating electron spins and considering the Pauli exclusion principle, the resulting LDOS consists of two components: one originating from an exchange-even two-particle GF and the other from an exchange-odd two-particle GF. The calculated LDOS reveals its dependence on both inter-electron distance and energy. The pseudo-LDOS, derived from the two-body contribution to the LDOS, is examined. This term ensures complete LDOS suppression atr = 0, exhibiting a limited spatial extent, and the reasons for its emergence are elucidated. It is shown that for energies exceeding the effective Hartree energy and inter-electron distances beyond the effective Bohr radius, the impact of many-body contributions to the LDOS can be disregarded. The induced LDOS for an electron pair subjected to an attractive contact potential in two dimensions is evaluated. At small distancesafrom the potential center, a predicted relative difference in LDOS between even and odd state pair reaches approximately 8%. The calculated LDOS is compared with available experimental findings from a two-dimensional electron gas (2DEG). Both exhibit similar oscillation periods; however, the LDOS of the electron pair decays as1/a3, significantly faster than the1/adecay observed for free electrons in a 2DEG.

Graphene/Metal Composites Decorated with Ni Nanoclusters: Mechanical Properties.

With the developments in nanotechnology, the elaborate regulation of microstructure shows attractive potential in the design of new composite materials. Herein, composite materials composed of graphene network filled with metal nanoparticles are analyzed to optimize the fabrication process and mechanical properties. In the present work, molecular dynamic simulations are used to analyze the possibility of obtaining a composite structure with Ni-decorated graphene. The weak bonding at the graphene-copper and graphene-aluminum interfaces is manipulated by functionalizing graphene with nickel nanoclusters. It is found that Ni decoration considerably increases interfacial bonding and, at the same time, prevents the formation of a strong graphene network. It is found that Ni decoration for the Al/graphene composite increases the its ductility by 0.6, while increasing it for the Cu/graphene composite by about 0.5. Ultimate tensile strength of the composite with Al and Cu is close and equal to 22 GPa, respectively. The strength of the composite with Ni-decorated graphene is much lower and equal to 13 GPa for Cu/graphene/Ni and 17 GPa for Al/graphene/Ni. While Young's modulus for the Cu/graphene composite is 18 GPA, for Al/graphene, Al/graphene/Ni, and Cu/graphene/Ni, it is 12 GPa. The obtained results demonstrate the future prospects of the graphene modification for better composite enhancement.

DAYA TARIK OBJEK WISATA AIR PUTRI WAIYOHO DI DESA KAWA KABUPATEN SERAM BAGIAN BARAT

The purpose of this study is to examine the appeal of the Air Putri Waiyoho tourist attraction and visitors' perceptions of Air Putri Waiyoho in Kawa Village, West Seram Regency. This research uses a survey method to assess the viability of the tourist attraction's potential, based on criteria from the Guidelines for Operational Area Analysis of Nature Tourism Attractions (ADO-ODTWA) by the Directorate General of Forest Protection and Nature Conservation (PHKA) in 2003, and qualitative descriptive analysis to understand visitor perceptions, with a sample of 77 visitor respondents interviewed.The main attraction at Air Putri Waiyoho is the fresh water spring in a bathing pool with clear, bright water surrounded by lush trees, enhancing the appeal for tourism activities. Based on the Tourism Feasibility Index analysis, the attraction criteria score 80.95%, accessibility criteria score 72.2%, and visitor facilities and infrastructure criteria score 66.6%. Thus, the feasibility analysis places Air Putri Waiyoho as a high-category tourist attraction. Visitor perceptions indicate a 100% attraction appeal, available facilities at 90.91%, and accessibility with 48% noting ease of transportation and reachability.

Impact of cut-off frequency effect on resonance energy transfer and Casimir–Polder interaction

Abstract Using the Green’s function approach, we investigate the resonance energy transfer (RET) rate between two parallel, identical two-level atoms in the presence of three types of cylindrical system: a distributed Bragg reflector (DBR), a perfectly reflecting wall (PRW), and a two-layer silicon fiber. Our analysis, incorporating the cut-off frequency condition, reveals significant suppression of the RET rate for atoms positioned along the axis of the cylinder with the PRW. In contrast, for atoms located within the DBR, the RET rate is enhanced in the far zone. Additionally, we find that for atoms oriented radially are placed inside or near the surface of the silicon fiber, the RET rate is entirely inhibited. We also investigate the Casimir–Polder (CP) interaction between a cut-off-frequency DBR and an excited atom, discovering a fully attractive potential towards the surface for the atom within the waveguide.

EKSPLORASI KEANEKARAGAMAN BURUNG SEBAGAI DAYA TARIK UTAMA AVITOURISM DI EKOWISATA MANGROVE CUKU NYINYI, KABUPATEN PESAWARAN

Birds play a significant ecological role and are also attractive for birdwatching tourism (avitourism), particularly in mangrove ecosystems which provide habitat and food sources. Exploring the avian diversity in the Cuku NyiNyi Mangrove Ecotourism Area for avitourism development can be a conservation effort for birds and provide economic incentives for local communities. This study aimed to identify bird species as potential attractions for avitourism in the Cuku NyiNyi Mangrove Ecotourism Area. Data analysis involved determining the conservation status and criteria of birds as potential objects and attractions for avitourism. A total of 32 bird species from 19 families were identified with a total of 113 individuals. Several bird species have conservation statuses that require attention, namely the cinnamon-headed green pigeon (Treron fulvicollis) which is categorized as vulnerable (VU) and the brahminy kite (Haliastur indus), crested serpent eagle (Spilornis cheela), racket-tailed treepie (Crypsirina temia), and malaysian pied fantail (Rhipidura javanica) which are protected species. The analysis showed that 18 bird species have the potential to be objects and attractions for avitourism based on criteria such as raptors, protected species, songbirds, endemic birds, and colorful birds. The avian diversity in the Cuku NyiNyi Mangrove Ecotourism Area supports the potential for avitourism to develop as a form of sustainable tourism for the protection of bird species while attracting tourists, especially birdwatchers.

Morphing wing design of truss-braced-wing aircraft through aerodynamic shape optimization using the adjoint method

It is still a challenge to evaluate the benefits of the morphing wing concept with a truss-braced wing wing–body–tail configuration. To address this problem, first, a fair baseline configuration is obtained with a multipoint optimization over six flight conditions. Then, three types of morphing wing design are investigated and compared based on the baseline shape. The results indicate that the simplified variable-camber continuous trailing-edge flap system has the smallest and limited benefit, with only a 0.70% weighted aerodynamic efficiency improvement, which may not be sufficient to cover the extra burden of the increased complexity and weight. The trailing-edge morphing design has a larger benefit, with an efficiency improvement of 1.73%, while the full-wing morphing design achieved the greatest benefit, with a 5.79% efficiency improvement, demonstrating the attractive aerodynamic potential and benefits of the truss-braced-wing aircraft. Further discussion on the drag-reduction sources and some design features is also presented.

Covalent Organic Framework Derived Oxygen/Sulfur-Doped Porous Carbon for Robust High-Capacitance Symmetric Supercapacitors.

Heteroatom-doped porous carbons (HPCs) have been considered promising electrode materials for supercapacitors due to their improvement of energy density by providing extra pseudocapacity. Covalent organic frameworks (COFs) are obtaining great importance in energy storage because of their designable structure and versatile functionality. Herein, we designed and fabricated oxygen and sulfur dual-doped covalent organic framework (COF) derived HPCs with very high heteroatoms content (up to 25.76 atom%) via a facile coupling reaction. The optimized HPCs exhibit a porous structure with high specific surface area (up to 2835 m2 g-1) along with a high specific capacitance (430 F g-1 at 0.5 A g-1), excellent capacitance retention (96.9%), and high coulombic efficiency (98.5%) after 10000 cycles at 5 A g-1. As electrodes for aqueous symmetric supercapacitors, the HPCs exhibits a high energy density of 60 Wh kg-1 at a 250 W kg-1 power density, excellent cycling stability of capacity retention (82.2%) and a high coulombic efficiency (92.3%) after 10000 cycles at 10 A g-1, indicating attractive application potential in chemical energy storage. This work establishes a promising strategy for preparation of high heteroatom content HPCs using COFs and demonstrates great potential for energy storage/conversion devices.