Negative / Null Result Report
Meaghan Neary, Kathleen Quan, Thomas Tjoa et al. · 2025 · Infection Control & Hospital Epidemiology
Abstract Objectives: To assess whether universal masking during the COVID-19 pandemic reduced neonatal acquisition of S. aureus . Study design: We performed a retrospective cohort study of neonates admitted to a level three regional NICU…
View details →DOI: 10.1017/ice.2025.10209 Negative / Null Result Report
Mellinee Lesley · 2026 · Journal of Adolescent & Adult Literacy
ABSTRACT Despite calls for writing reform over the past two decades, few of the recommendations from this work have made their way into high school classrooms in the United States where concerns about the paucity and quality of writing…
View details →DOI: 10.1002/jaal.70055 Negative / Null Result Report
Mengqi Liao, Yuan Sun, Timilehin Durotoye et al. · 2026 · Social Media + Society
Many individuals do not seek news, believing instead that “news will find me” (NFM), implying that they trust their social networks to keep them informed, saving them the trouble of proactively seeking news from journalistic outlets. Does…
View details →DOI: 10.1177/20563051261434801 Negative / Null Result Report
Valérie Smet · 2013 · Beleidsonderzoek Online
Evidence-based policy en de doorwerking van sociaalwetenschappelijk onderzoek: are we there yet? Internationaal stijgt de aandacht voor evidence-based policy (EBP); de term duikt steeds vaker op in het beleidsdiscours. Het empirisch…
View details →DOI: 10.5553/beleidsonderzoek.000031 Negative / Null Result Report
G. Santarpino, M. Moscarelli, A. Nicoletti et al. · 2018 · Journal of Cardiovascular Medicine
Background and Aim: The aim of this study is to evaluate the patients who have required a pacemaker implantation after a sutureless aortic valve implant, evaluating their clinical history and preoperative risk factors, the peri- and…
View details →DOI: 10.2459/01.jcm.0000550003.29669.37 Negative / Null Result Report
Habib Hasan Farooqui, Anup Karan, Aashna Mehta et al. · 2025 · BMC Infectious Diseases
Abstract Background Recent research has indicated an increase in antibiotic utilisation, particularly pediatric formulations. Furthermore, an increasing trend in antimicrobial resistance rates has also been reported. Empirical evidence…
View details →DOI: 10.1186/s12879-025-11082-3 Negative / Null Result Report
Marcela N. Jiménez Zacur, Pastor Enmanuel Pérez-Estigarribia, Alberto Esquivel Mattos · 2023 · Reportes científicos de la FACEN
Ante el cambio climático, las especies pueden perder representación de su nicho en el biotopo, viéndose afectado el riesgo de extinción. Esta breve revisión de la literatura pretende establecer las bases del estado del conocimiento sobre…
View details →DOI: 10.18004/rcfacen.2023.14.2.114 Negative / Null Result Report
Najma Latif, Padmini Sarathchandra, Adrian H Chester et al. · 2012 · QScience Proceedings
Abstract Aortic stenosis and valvular degeneration is characterized by lipid accumulation, presence of cartilage and calcification. The identity and cellular origins of the cells mediating these effects are unknown. We have investigated…
View details →DOI: 10.5339/qproc.2012.heartvalve.4.18 Negative / Null Result ReportOpen accessPhysics
Ulrich H. E. Hansmann · 1997 · arXiv
We discuss the use of Tsallis generalized mechanics in simulated annealing algorithms. For a small peptide it is shown that older implementations are not more effective than regular simulated annealing in finding ground state configurations. We propose a new implementation which leads to an improvement over regular simulated annealing.
Negative / Null Result Report
Christina E. Carter · 2010 · Evidence Based Library and Information Practice
Objective – To assess how the increase in number of electronic journals available to academic scholars has changed their information-seeking or consulting behaviour, with respect to 1) the amount and diversity of sources they read; 2)…
View details →DOI: 10.18438/b8f03x Negative / Null Result Report
Elizabeth C. Stuart, Justin R. Meyer · 2026 · Viruses
Antimicrobial resistance has renewed interest in bacteriophage therapy, yet bacterial evolution frequently undermines treatment efficacy. Combination phage therapy is commonly implemented as simultaneous phage cocktails, but whether this…
View details →DOI: 10.3390/v18040404 Negative / Null Result Report
Anam Bilgrami, Henry Cutler, Kompal Sinha · 2024 · Industrial Relations: A Journal of Economy and Society
Abstract A quasi‐experiment was created in Australian policy between 2012 and 2013 when workplace health and safety laws were harmonized in all but two jurisdictions. This reform expanded definitions for duty of care, introduced criminal…
View details →DOI: 10.1111/irel.12357 Negative / Null Result ReportOpen accessMedicine
Paap K, Majoubi J · 2025 · Experimental psychology
In a recent article, Ellen Bialystok argued that bilingual experience enhances nonverbal cognition, that its effects are continuous rather than categorical, and that selective attention is the key mechanism underlying cognitive changes in…
View details →DOI: 10.1027/1618-3169/a000648 Negative / Null Result Report
Karen E Lasser, Chieh Chu, Danny McCormick et al. · 2012 · Circulation: Cardiovascular Quality and Outcomes
Introduction: After Massachusetts (MA) health reform, the percent of uninsured residents fell, particularly among minorities. Studies have not examined the effect of this policy change on 30-day readmission rates, and disparities in such…
View details →DOI: 10.1161/circoutcomes.5.suppl_1.a126 Negative / Null Result Report
Anna Prucnal · 2025 · International Journal of Business & Management Studies
This study examines the effectiveness of the monetary policy of the European Central Bank (ECB) in managing inflation in the Euro Area compared to the independent monetary policy of seven European Union Member States outside the Economic…
View details →DOI: 10.56734/ijbms.v6n1a7 Negative / Null Result ReportOpen accessComputer Science
Nandakishore Santhi, Alexander Vardy · 2006 · arXiv
We consider the problem of estimating the probability of error in multi-hypothesis testing when MAP criterion is used. This probability, which is also known as the Bayes risk is an important measure in many communication and information theory problems. In general, the exact Bayes risk can be difficult to obtain. Many upper and lower bounds are known in literature. One such upper bound is the equivocation bound due to Rényi which is of great philosophical interest because it connects the Bayes risk to conditional entropy. Here we give a simple derivation for an improved equivocation bound. We
Negative / Null Result ReportOpen accessComputer Science
Wenbin Wu · 2026 · arXiv
Reinforcement Learning from Human Feedback (RLHF) assumes annotator preferences reflect stable internal states. We challenge this through three experiments spanning the preference pipeline. In a human choice blindness study, 91% of surreptitiously swapped preferences go undetected, extending choice blindness to third-person evaluative comparison of unfamiliar text. Testing fifteen LLM judges as potential replacements, we find detection relies on shallow text matching rather than genuine self-monitoring: removing prior reasoning from context causes blindness to surge from near-zero to over 50%,
Negative / Null Result ReportOpen accessComputer Science
Reza Fotohi, Mehdi Effatparvar, Fateme Sarkohaki et al. · 2019 · arXiv
Multicore is an integrated circuit chip that uses two or more computational engines (cores) places in a single processor. This new approach is used to split the computational work of a threaded application and spread it over multiple execution cores, so that the computer system can benefits from a better performance and better responsiveness of the system. A thread is a unit of execution inside a process that is created and maintained to execute a set of actions/ instructions. Threads can be implemented differently from an operating system to another, but the operating system is in most cases
Negative / Null Result ReportOpen accessComputer Science
Rittick Roy, Urjit A. Yajnik · 2019 · arXiv
Kerr black holes coupled to quantized bosonic fields display a special version of the Hawking effect, governed by the superradiance condition. This leads to rapid growth of boson cloud through spontaneous creation, leading to slowing down of the black hole, and detectable as growth of the black hole shadow. This can be developed into a technique for searching or constraining the existence of ultralight bosons. We study this phenomenon for spin-0 bosons in the shadow of a black hole, with a detailed analysis of Sgr$A^*$, and put estimates on the evolution time scales and subsequent change in th
Negative / Null Result ReportOpen accessComputer Science
Shibdas Roy, Ian R. Petersen, Elanor H. Huntington · 2014 · arXiv
We consider a coherent-classical estimation scheme for a class of linear quantum systems. It comprises an estimator that is a mixed quantum-classical system without involving coherent feedback. The estimator yields a classical estimate of a variable for the quantum plant. We demonstrate that for a passive plant that can be characterized by annihilation operators only, such coherent-classical estimation provides no improvement over purely-classical estimation. An example is also given which shows that if the plant is not assumed to be an annihilation operator only quantum system, it is possible
Negative / Null Result ReportOpen accessComputer Science
Mateusz Praski, Jakub Adamczyk, Wojciech Czech · 2025 · arXiv
Pretrained neural networks have attracted significant interest in chemistry and small molecule drug design. Embeddings from these models are widely used for molecular property prediction, virtual screening, and small data learning in molecular chemistry. This study presents the most extensive comparison of such models to date, evaluating 25 models across 25 datasets. Under a fair comparison framework, we assess models spanning various modalities, architectures, and pretraining strategies. Using a dedicated hierarchical Bayesian statistical testing model, we arrive at a surprising result: nearl
Negative / Null Result ReportOpen accessComputer Science
Cid Reyes-Bustos, Masato Wakayama · 2022 · arXiv
The non-commutative harmonic oscillator (NCHO) is a matrix valued differential operator originally introduced as a generalization of the quantum harmonic oscillator having a weaker $\mathfrak{sl}_2(\mathbb{R})$-symmetry. The spectrum of the NCHO has remarkable properties, including the presence of number theoretical structures such as modular forms, elliptic curves and Eichler cohomology observed in the special values of the associated spectral zeta function. In addition, the Heun ODE picture of the eigenvalue problem of the NCHO reveals a connection with the quantum Rabi model (QRM), a fundam
Negative / Null Result ReportOpen accessComputer Science
Elad Hazan, Tomer Koren, Kfir Y. Levy · 2014 · arXiv
The logistic loss function is often advocated in machine learning and statistics as a smooth and strictly convex surrogate for the 0-1 loss. In this paper we investigate the question of whether these smoothness and convexity properties make the logistic loss preferable to other widely considered options such as the hinge loss. We show that in contrast to known asymptotic bounds, as long as the number of prediction/optimization iterations is sub exponential, the logistic loss provides no improvement over a generic non-smooth loss function such as the hinge loss. In particular we show that the c
Negative / Null Result ReportOpen accessComputer Science
Mai Vu · 2011 · arXiv
We establish the optimal input signaling and the capacity of MIMO channels under per-antenna power constraint. While admitting a linear eigenbeam structure, the optimal input is no longer diagonalizable by the channel right singular vectors as with sum power constraint. We formulate the capacity optimization as an SDP problem and solve in closed-form the optimal input covariance as a function of the dual variable. We then design an efficient algorithm to find this optimal input signaling for all channel sizes. The proposed algorithm allows for straightforward implementation in practical system
Negative / Null Result ReportOpen accessPhysics
Md Nahid Haque Shazon, Piyush Kumar, Luqiao Liu et al. · 2025 · arXiv
This paper presents physical modeling and benchmarking for two-terminal spin-orbit torque magnetic random-access memory (2T-SOT-MRAM). The results indicate that the common SOT materials that provide only in-plane torque can provide little to no improvement over spin-transfer-torque (STT) MRAM in terms of write energy. However, emerging SOT materials that provide out-of-plane torques with efficiencies as small as 0.1 can result in significant improvements in the write energy for such 2-terminal devices, especially when the magnet lateral dimensions are scaled down to 30 or 20 nm. Additionally,
Negative / Null Result ReportOpen accessComputer Science
Gabriel Grand, Valerio Pepe, Jacob Andreas et al. · 2024 · arXiv
Questions combine our mastery of language with our remarkable facility for reasoning about uncertainty. How do people navigate vast hypothesis spaces to pose informative questions given limited cognitive resources? We study these tradeoffs in a classic grounded question-asking task based on the board game Battleship. Our language-informed program sampling (LIPS) model uses large language models (LLMs) to generate natural language questions, translate them into symbolic programs, and evaluate their expected information gain. We find that with a surprisingly modest resource budget, this simple M
Negative / Null Result ReportOpen accessMathematics
Shibdas Roy, Ian R. Petersen, Elanor H. Huntington · 2015 · arXiv
We study a coherent-classical estimation scheme for a class of linear quantum systems, where the estimator is a mixed quantum-classical system that may or may not involve coherent feedback. We show that when the quantum plant or the quantum part of the estimator (coherent controller) is an annihilation operator only system, coherent-classical estimation without coherent feedback can provide no improvement over purely-classical estimation. Otherwise, coherent-classical estimation without feedback can be better than classical-only estimation for certain homodyne detector angles, although the for
Negative / Null Result ReportOpen accessComputer Science
John T. Holodnak, Allan B. Wollaber · 2021 · arXiv
Multiple techniques for producing calibrated predictive probabilities using deep neural networks in supervised learning settings have emerged that leverage approaches to ensemble diverse solutions discovered during cyclic training or training from multiple random starting points (deep ensembles). However, only a limited amount of work has investigated the utility of exploring the local region around each diverse solution (posterior mode). Using three well-known deep architectures on the CIFAR-10 dataset, we evaluate several simple methods for exploring local regions of the weight space with re
Negative / Null Result ReportOpen accessPhysics
R. L. Bates, C. Da'Via, S. D'Auria et al. · 1997 · arXiv
Semi-insulating, undoped, Liquid Encapsulated Czochralski (SI-U LEC) GaAs detectors have been irradiated with 1MeV neutrons, 24GeV/c protons, and 300MeV/c pions. The maximum fluences used were 6, 3, and 1.8~10$^{14}$ particles/cm$^{2}$ respectively. For all three types of irradiation the charge collection efficiencies (cce) of the detector are reduced due to the reduction in the electron and hole mean free paths. Pion and proton irradiations produce a greater reduction in cce than neutron irradiation with the pions having the greatest effect. The effect of annealing the detectors at room tempe
Negative / Null Result ReportOpen accessComputer Science
Victor Lagerkvist, Johanna Groven, Leif Eriksson · 2026 · arXiv
The region connection calculus ($RCC$) and Allen's interval algebra ($IA$) are two well-known NP-hard spatial-temporal qualitative reasoning problems. They are solvable in $2^{O(n \log n)}$ time, where $n$ is the number of variables, and $IA$ is additionally known to be solvable in $o(n)^n$ time. However, no improvement over exhaustive search is known for $RCC$, and if they are also solvable in single exponential time $2^{O(n)}$ is unknown. We investigate multiple avenues towards reaching such bounds. First, we show that branching is insufficient since there are too many non-redundant constrai
