Negative / Null Result ReportOpen accessPhysics
Vadim V. Bobylev, Maxim Yu. Khovritchev · 2006 · arXiv
Based on the Ogorodnikov-Milne model, we analyze the proper motions of Tycho-2 and UCAC2 stars. We have established that the model component that describes the rotation of all stars under consideration around the Galactic y axis differs significantly from zero at various magnitudes. We interpret this rotation found using the most distant stars as a residual rotation of the ICRS/Tycho-2 system relative to the inertial reference frame. For the most distant ($d\approx900$ pc) Tycho-2 and UCAC2 stars, the mean rotation around the Galactic y axis has been found to be $M_{13}=-0.37\pm0.04$ mas yr$^{
Negative / Null Result ReportOpen accessComputer Science
Meryem Yilmaz Soylu, Jeonghyun Lee, Jui-Tse Hung et al. · 2025 · arXiv
As Artificial Intelligence (AI) tools become increasingly embedded in higher education, understanding how students interact with these systems is essential to supporting effective learning. This study examines how students' AI literacy and prior exposure to AI technologies shape their perceptions of Socratic Mind, an interactive AI-powered formative assessment tool. Drawing on Self-Determination Theory and user experience research, we analyze relationships among AI literacy, perceived usability, satisfaction, engagement, and perceived learning effectiveness. Data from 309 undergraduates in Com
Negative / Null Result ReportOpen accessEconomics, Econometrics and Finance
Akhmad Muhammadin, Rashila Ramli, Syamsul Ridjal et al. · 2020 · arXiv
The dynamic capability and marketing strategy are challenges to the banking sector in Indonesia. This study uses a survey method solving 39 banks in Makassar. Data collection was conducted of questionnaires. The results show that, the dynamic capability has a positive yet insignificant impact on the organizational performance, the marketing strategy has a positive and significant effect on organizational performance and, dynamic capability and marketing strategy have a positive and significant effect on the organization's performance in the banking sector in Makassar. Keywords : dynamic capabi
Negative / Null Result ReportOpen accessPhysics
L. K. Alexander, N. Buettgen, R. Nath et al. · 2006 · arXiv
We report 7Li NMR, magnetic susceptibility, and heat capacity measurements on the triangular lattice Heisenberg antiferromagnet compound LiCrO2. We find that in contrast to NaCrO2, magnetic properties of LiCrO2 have a more pronounced three dimensional character with sharp anomalies in the temperature variation of the 7Li NMR intensity and the NMR spin-lattice relaxation rate 1/T1. From heat capacity measurements we find that the total entropy related to the magnetic transition is in agreement with expectations. However, we find a significant contribution to the magnetic entropy in the range fr
Negative / Null Result ReportOpen accessMathematics
Antonin Novak, Andrzej Gnatowski, Premysl Sucha · 2025 · arXiv
This paper addresses the problem of batching laboratory samples in hospital laboratories where samples of different priorities are received continuously with uncertain transportation times. The focus is on optimizing the control strategy for loading a centrifuge to minimize patient turnaround time (TAT). While focusing on samples of patients in life-threatening situations (i.e., vital samples), we propose several online and offline methods, including a stochastic mixed-integer quadratic programming model integrated within a discrete-event system simulation. This paper aims to enhance patient c
Negative / Null Result ReportOpen accessComputer Science
S. Mouslih, M. Jakha, S. El Asri et al. · 2021 · arXiv
Choosing a specific direction for the propagation of laser field waves often presents a challenge for researchers studying laser-assisted ultrafast quantum processes. They are faced with the question of why exactly this direction and not another. This paper resolves the discussion in this issue regarding decay processes. Therefore, we study theoretically the pion decay process in the presence of a circularly polarized laser field propagating along an arbitrary general direction. Using the first Born approximation and the Dirac-Volkov states for charged particles, we derive an analytic expressi
Failed Experiment ReportOpen accessPhysics
Khadijeh Najafi, M. A. Rajabpour · 2017 · arXiv
In a recent letter, J. Cardy, Phys. Rev. Lett. \textbf{112}, 220401 (2014), the author made a very interesting observation that complete revivals of quantum states after quantum quench can happen in a period which is a fraction of the system size. This is possible for critical systems that can be described by minimal conformal field theories (CFT) with central charge $c<1$. In this article, we show that these complete revivals are impossible in microscopic realizations of those minimal models. We will prove the absence of the mentioned complete revivals for the critical transverse field Ising
Negative / Null Result ReportOpen accessComputer Science
Bhaskar Gurram · 2026 · arXiv
Automated evaluation of tool-using large language model (LLM) agents is widely assumed to be reliable, but this assumption has rarely been validated against human annotation. We introduce AgentProp-Bench, a 2,000-task benchmark with 2,300 traces across four domains, nine production LLMs, and a 100-label human-validated subset. We quantify judge reliability, characterize error propagation, and evaluate a runtime mitigation. Substring-based judging agrees with human annotation at kappa=0.049 (chance-level); a three-LLM ensemble reaches kappa=0.432 (moderate) with a conservative bias. Under valid
Negative / Null Result ReportOpen accessPhysics
K. Pradeesh, C. J. Oton, V. K. Agotiya et al. · 2007 · arXiv
A new class of Erbium doped glasses with compositions xNa2O - (60-x)PbCl2 - 40P2O5 (x=0, 10, 20 and 30) were fabricated and characterized for optical properties. Absorption spectra were analyzed for important Judd-Ofelt parameters from the integrated intensities of various Er3+ glass absorption bands. Photoluminescence (PL) and its decay behavior studies were carried out for the transition 4I13/2 -> 4I15/2. A systematic correlation between the Judd-Ofelt parameter {omega}2 and the covalent nature of the glass matrix was observed, due to increased role of bridging oxygens in the glass network.
Negative / Null Result ReportOpen accessPhysics
Dongsu Ryu, Jongsoo Kim, Seung Soo Hong et al. · 2003 · arXiv
The Parker instability, which has been considered as a process governing the structure of the interstellar medium, is induced by the buoyancy of magnetic field and cosmic rays. In previous studies, while the magnetic field has been fully incorporated in the context of isothermal magnetohydrodynamics, cosmic rays have been normally treated with the simplifying assumption of infinite diffusion along magnetic field lines but no diffusion across them. The cosmic ray diffusion is, however, finite. In this work, we take into account fully the diffusion process of cosmic rays in a linear stability an
Negative / Null Result ReportOpen accessEconomics, Econometrics and Finance
Mohammad Hassan Shakil, Arne Johan Pollestad, Khine Kyaw et al. · 2025 · arXiv
With European Union initiatives mandating gender quotas on corporate boards, a key question arises: Is greater board gender diversity (BGD) associated with better emissions performance (EP)? To answer this question, we examine the influence of BGD on EP across a sample of European firms from 2016 to 2022. Using panel regressions, advanced machine learning algorithms, and explainable AI, we reveal a non-linear relationship. Specifically, EP improves with BGD up to an optimal level of approximately 35 %, beyond which further increases in BGD yield no additional improvement in EP. A minimum BGD t
Negative / Null Result ReportOpen accessComputer Science
Pappu Kumar Yadav, J. Alex Thomasson, Robert G. Hardin et al. · 2022 · arXiv
Plastic shopping bags that get carried away from the side of roads and tangled on cotton plants can end up at cotton gins if not removed before the harvest. Such bags may not only cause problem in the ginning process but might also get embodied in cotton fibers reducing its quality and marketable value. Therefore, it is required to detect, locate, and remove the bags before cotton is harvested. Manually detecting and locating these bags in cotton fields is labor intensive, time-consuming and a costly process. To solve these challenges, we present application of four variants of YOLOv5 (YOLOv5s
Negative / Null Result ReportMedicine
Özel, Efiloğlu, Cim et al. · 2026 · Neurourology and urodynamics
This study aimed to evaluate the association between gestational diabetes mellitus and urinary incontinence during pregnancy, including symptom subtype, symptom severity, and incontinence-related quality of life. This cross-sectional study…
View details →DOI: 10.1002/nau.70360 Negative / Null Result ReportMedicine
van Driel, Swartjes, Lemmens et al. · 2026 · The British journal of surgery
Colorectal cancer (CRC) incidence is rising, consequentially traditional follow-up care models are increasingly unsustainable. Patient-led, home-based follow-up (PHFU) may offer a promising alternative to reduce hospital visits while…
View details →DOI: 10.1093/bjs/znag081 Negative / Null Result ReportOpen accessEconomics, Econometrics and Finance
Agnieszka Kleszcz, Krzysztof Rusek · 2022 · arXiv
Nowadays innovation is one of the main determinants of economic development. Patents are a key measure of innovation output, as patent indicators reflect the inventive performance of countries, technologies and firms. This paper provides new insights on the causal effects of the enlargement of the European Union (EU) by investigating the patents performance within the new EU member states (EU-13). The empirical results based on data collected from the OECD database from 1985-2017 and causal impact using a Bayesian structural time-series model (proposed by Google) point towards a conclusion tha
Negative / Null Result ReportOpen accessEconomics, Econometrics and Finance
Novriana Sumarti, Rafki Hidayat · 2013 · arXiv
The Financial Crisis of 2008 is a worldwide financial crisis causing a worldwide economic decline that is the most severe since the 1930s. According to the International Monetary Fund (IMF), the global financial crisis gave impact on USD 3.4 trillion losses from financial institutions around the world between 2007 and 2010. Does the crisis give impact on the returns of the U.S. movie Box Office? It will be answered by doing an analysis on the financial risk model based on Extreme Value Theory (EVT) and calculations of Value at Risk (VaR) and Expected Shortfall (ES). The values of VaR and ES fr
Negative / Null Result ReportOpen accessPhysics
Zahra Talebi Esfahani, Alireza Saffarzadeh, Ahmad Akhound et al. · 2020 · arXiv
The adsorption effects of small molecules (H$_{2}$O, CO, NH$_{3}$, NO$_{2}$) and large molecules (Tetracyanoquinodimethane (TCNQ) and Tetrafluoro-tetracyanoquinodimethane (F4TCNQ)) on electronic and magnetic properties of two triangular graphene antidot lattices (GALs), $[10,3,6]_{RTA}$ and $[10, 5]_{ETA}$, are investigated by means of first-principles calculations. We find that CO, NO$_{2}$, TCNQ, and F4TCNQ molecules are chemisorbed by both antidots, whereas NH$_{3}$ is physisorbed (chemisorbed) by $[10, 5]_{ETA}$ ($[10,3,6]_{RTA}$) structure. H$_{2}$O, CO, NH$_{3}$ molecules reveal no signi
Negative / Null Result ReportOpen accessPhysics
James D. Boyd, Martha E. Grady · 2020 · arXiv
We investigate laser-induced acoustic wave propagation through smooth and roughened titanium-coated glass substrates. Acoustic waves are generated in a controlled manner via the laser spallation technique. Surface displacements are measured during stress wave loading by alignment of a Michelson-type interferometer. A reflective coverslip panel facilitates capture of surface displacements during loading of as-received smooth and roughened specimens. Through interferometric experiments we extract the substrate stress profile at each laser fluence (energy per area). The shape and amplitude of the
Negative / Null Result ReportOpen accessPhysics
Pooja C. Sindhuraj, José M. Caridad, Corné Koks et al. · 2025 · arXiv
Hexagonal boron nitride (hBN), a two-dimensional (2D) material, garners interest for hosting bright quantum emitters at room temperature. A great variety of fabrication processes have been proposed with various yields of quantum emitters. In this work, we study the influence of several parameters, such as irradiation energy, annealing environment, and the type of hBN, on the emitter density in hBN. Our results show (i) high emitter density with oxygen irradiation at 204 eV, (ii) post-annealing in carbon-rich atmospheres significantly increases emitter density, reinforcing carbon's potential ro
Negative / Null Result ReportMedicine
Tham, Linn, Koh et al. · 2026 · Transplantation and cellular therapy
The presence of anti-human leukocyte antigen (HLA) antibodies directed against donor HLA (HLA-DSA) in HLA-mismatched haematopoietic stem cell transplantation (HCT) can affect engraftment and transplant outcomes. Desensitisation treatment…
View details →DOI: 10.1016/j.jtct.2026.06.043 Negative / Null Result ReportOpen accessPhysics
Chong Yang Du, André Guerra, Adam McElligott et al. · 2023 · arXiv
Reversible addition-fragmentation chain-transfer polymerization with a switchable chain-transfer agent was employed to synthesize amphiphilic block copolymers poly(styrene-b-vinylpyrrolidone) and poly(pentafluorostyrene-b-vinylpyrrolidone) at 10 wt.% hydrophobic content as kinetic hydrate inhibitors for methane hydrates. The dynamic viscosity of methane hydrate slurries was measured in a high-pressure rheometer up to 15 MPag. At 700 ppm of additives in aqueous media, the relative time for slurries to grow to 200 mPa s was 2.2-2.4 times longer than water reference values for the block copolymer
Negative / Null Result ReportOpen accessPhysics
Linda Qerimi, Sarah Malone, Eva Rexigel et al. · 2025 · arXiv
Visual-graphical qubit representations offer a means to introduce abstract quantum concepts - such as quantum state, superposition, or measurement - in an accessible manner, particularly for learners with low prior knowledge. Building on a previous expert rating of mechanisms of qubit representations, this study compared two representations - Bloch sphere and Quantum Bead - in terms of learning outcomes, task performance, cognitive load, and mid-term retention. The study was conducted with N=149 school students. The study assessed conceptual understanding, application-oriented task performance
Negative / Null Result ReportOpen accessComputer Science
Jun-Shuai Wang, Chang Liu, Ju Chen et al. · 2025 · arXiv
In this work, we systematically investigate the capability of space-based gravitational wave detectors in constraining parameters of non-tensor polarization modes. Using Bayesian inference and Fisher Information Matrix methods, we analyze gravitational wave signals from the inspiral phase of supermassive binary black hole mergers. By starting with time-domain signals and applying Fourier transforms, we avoid the use of the stationary phase approximation. We found an asymmetry in the estimation of the vector-mode parameter $α_x$ at inclination angles $ι= 0$ and $ι= π$, which has not been explic
Negative / Null Result ReportOpen accessComputer Science
Jingchao Fang, Victoria Xiaohan Wen, Mina Lee · 2026 · arXiv
The growing capability of artificial intelligence (AI) leads to its increasing adoption in writing, spurring discussions around whether writers should disclose their AI use in writing. What influences the perceived necessity of disclosure? We look into this question from three dimensions: perspective (reader or writer of the text), purpose (the goal of reading or writing), and procedural factors (how AI was used in the writing process in terms of replaceability, effortfulness, intentionality, and directness). In a vignette study (N = 727), we find that readers consider disclosure to be more ne
Negative / Null Result ReportOpen accessPhysics
A. Mainzer, J. Bauer, R. M. Cutri et al. · 2014 · arXiv
NASA's Wide-field Infrared Survey Explorer (WISE) spacecraft has been brought out of hibernation and has resumed surveying the sky at 3.4 and 4.6 um. The scientific objectives of the NEOWISE reactivation mission are to detect, track, and characterize near-Earth asteroids and comets. The search for minor planets resumed on December 23, 2013, and the first new near-Earth object (NEO) was discovered six days later. As an infrared survey, NEOWISE detects asteroids based on their thermal emission and is equally sensitive to high and low albedo objects; consequently, NEOWISE-discovered NEOs tend to
Negative / Null Result ReportOpen accessMathematics
H. Sherry Zhang, Dianne Cook, Nicolas Langrené et al. · 2024 · arXiv
The projection pursuit (PP) guided tour optimizes a criterion function, known as the PP index, to gradually reveal projections of interest from high-dimensional data through animation. Optimization of some PP indexes can be non-trivial, if they are non-smooth functions, or when the optimum has a small "squint angle", detectable only from close proximity. Here, measures for calculating the smoothness and squintability properties of the PP index are defined. These are used to investigate the performance of a recently introduced swarm-based algorithm, Jellyfish Search Optimizer (JSO), for optimiz
Negative / Null Result ReportOpen accessComputer Science
Wenqing Zhang, Trang Nguyen, Elizabeth A. Stuart et al. · 2025 · arXiv
Systematic reviews are crucial for synthesizing scientific evidence but remain labor-intensive, especially when extracting detailed methodological information. Large language models (LLMs) offer potential for automating methodological assessments, promising to transform evidence synthesis. Here, using causal mediation analysis as a representative methodological domain, we benchmarked state-of-the-art LLMs against expert human reviewers across 180 full-text scientific articles. Model performance closely correlated with human judgments (accuracy correlation 0.71; F1 correlation 0.97), achieving
Negative / Null Result ReportMedicine
Ni, Adams, Momenaei et al. · 2026 · Ophthalmology. Retina
To assess the effect of prophylactic treatment of lattice degeneration on retinal break and rhegmatogenous retinal detachment (RRD) risk in fellow eyes of patients with bilateral lattice degeneration treated for retinal break(s) without RD…
View details →DOI: 10.1016/j.oret.2026.06.016 Negative / Null Result ReportOpen accessPhysics
Zhangkai Cao, Shuning Tan, Ji Liu et al. · 2025 · arXiv
Motivated by significant discrepancies between experimental observations of electron-doped cuprates and numerical results of the Hubbard model, we investigate the role of nearest-neighbor (NN) electron interactions $V$ by studying the $t-U-V$ model on square lattices. Upon doping $δ$= 0.153, by using constrained path quantum Monte Carlo (CPQMC) method, we find that NN electron attraction $V$ can notably drive an exotic $p$-wave spin-triplet pairing, while the NN electron repulsion $V$ will suppress the $d_{x^2-y^2}$-wave ($d$-wave) pairing and triggers the $d_{xy}$-wave pairing. Especially in
Negative / Null Result ReportOpen accessComputer Science
Dustin Eisenhardt, Timothy Schaumlöffel, Alperen Kantarci et al. · 2026 · arXiv
Deep learning models for computer vision often suffer from poor generalization when deployed in real-world settings, especially when trained on synthetic data due to the well-known Sim2Real gap. Despite the growing popularity of style transfer as a data augmentation strategy for domain generalization, the literature contains unresolved contradictions regarding three key design axes: the diversity of the style pool, the role of texture complexity, and the choice of style source. We present a systematic empirical study that isolates and evaluates each of these factors for driving scene understan
