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Browse the failure-mode index

21,742 real negative results, null findings, and replication failures. Search the index →

WASTE indexes published research — it does not host or republish full papers. Each entry is a metadata record compiled from open scholarly databases; the abstract is shown in full only where the paper is openly licensed, otherwise a short excerpt under fair use. Classifications are automated and approximate.

Negative / Null Result ReportMedicine

Effect of build orientation, sintering schedule, and resin cement on the bond strength of additively manufactured zirconia to dentin.

Sabatini, Molinero-Mourelle, Limones et al. · 2026 · The Journal of prosthetic dentistry

Whether the manufacturing protocol (build orientation and sintering schedule) of additively manufactured (AM) zirconia impacts the bond strength compared with subtractively manufactured (SM) zirconia remains unclear. The purpose of this in…

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Negative / Null Result ReportOpen accessComputer Science

An efficient magic state approach to small angle rotations

Earl T. Campbell, Joe O'Gorman · 2016 · arXiv

Standard error correction techniques only provide a quantum memory and need extra gadgets to perform computation. Central to quantum algorithms are small angle rotations, which can be fault-tolerantly implemented given a supply of an unconventional species of magic state. We present a low-cost distillation routine for preparing these small angle magic states. Our protocol builds on the work of Duclos-Cianci and Poulin [Phys. Rev. A, 91, 042315 (2015)] by compressing their circuit. Additionally, we present a method of diluting magic states that reduces costs associated with very small angle rot

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Negative / Null Result ReportOpen accessComputer Science

Rumour Evaluation with Very Large Language Models

Dahlia Shehata, Robin Cohen, Charles Clarke · 2024 · arXiv

Conversational prompt-engineering-based large language models (LLMs) have enabled targeted control over the output creation, enhancing versatility, adaptability and adhoc retrieval. From another perspective, digital misinformation has reached alarming levels. The anonymity, availability and reach of social media offer fertile ground for rumours to propagate. This work proposes to leverage the advancement of prompting-dependent LLMs to combat misinformation by extending the research efforts of the RumourEval task on its Twitter dataset. To the end, we employ two prompting-based LLM variants (GP

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Negative / Null Result ReportOpen accessPhysics

Path-Extrema Upper Bounds on Mean Entropy Production

Surachate Limkumnerd · 2026 · arXiv

Fluctuation relations imply the second-law inequality $\langleΣ_T\rangle\ge0$, but path extrema can also constrain how large the mean entropy production can be. For steady-state processes with entropy-production martingale $M_t=e^{-Σ_t}$, we show that knowing only the positive running maximum of $Σ_t$ gives no improvement over the trivial endpoint bound: rare negative entropy-production excursions can still carry the exponential weight required by the fluctuation relation. Using the running extrema $L_T=\inf M_t$ and $H_T=\sup M_t$, we derive a path-extrema upper envelope $\mathcal{U}_{\rm ext

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Negative / Null Result ReportOpen accessComputer Science

Monte-Carlo Planning: Theoretically Fast Convergence Meets Practical Efficiency

Zohar Feldman, Carmel Domshlak · 2013 · arXiv

Popular Monte-Carlo tree search (MCTS) algorithms for online planning, such as epsilon-greedy tree search and UCT, aim at rapidly identifying a reasonably good action, but provide rather poor worst-case guarantees on performance improvement over time. In contrast, a recently introduced MCTS algorithm BRUE guarantees exponential-rate improvement over time, yet it is not geared towards identifying reasonably good choices right at the go. We take a stand on the individual strengths of these two classes of algorithms, and show how they can be effectively connected. We then rationalize a principle

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Negative / Null Result ReportOpen accessComputer Science

Scalable Approach for Normalizing E-commerce Text Attributes (SANTA)

Ravi Shankar Mishra, Kartik Mehta, Nikhil Rasiwasia · 2021 · arXiv

In this paper, we present SANTA, a scalable framework to automatically normalize E-commerce attribute values (e.g. "Win 10 Pro") to a fixed set of pre-defined canonical values (e.g. "Windows 10"). Earlier works on attribute normalization focused on fuzzy string matching (also referred as syntactic matching in this paper). In this work, we first perform an extensive study of nine syntactic matching algorithms and establish that 'cosine' similarity leads to best results, showing 2.7% improvement over commonly used Jaccard index. Next, we argue that string similarity alone is not sufficient for a

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Negative / Null Result Report

The ability of VBNC F. tularensis to replicate within THP-1 cells.

Carly Cunningham, Stuart Cantlay, Joseph Horzempa · 2019 · Proceedings of the West Virginia Academy of Science

CARLY CUNNINGHAM, STUART CANTLAY, AND JOSEPH HORZEMPA, Department of Natural Sciences and Mathematics, West Liberty University, West Liberty, WV USA. The ability of VBNC F. tularensis to replicate within THP-1 cells. Francisella…

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Negative / Null Result ReportOpen accessPhysics

Lee-Huang-Yang dynamics emergent from a direct Wigner representation

King Lun Ng, Maciej Bartłomiej Kruk, Piotr Deuar · 2026 · arXiv

We demonstrate how the beyond-mean-field Lee-Huang-Yang (LHY) corrections and its related physics can be naturally incorporated into the representation of an ultracold Bose gas using the truncated Wigner approach without invoking effective energy terms or local density assumptions. By generating a Bogoliubov ground-state representation with appropriately tailored bare interaction strength $g_0$ and condensate density $n_0$, the expected initial energy and densities are obtained while retaining access to quantum effects beyond the reach of the extended Gross-Pitaevskii equation (EGPE) formulati

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Negative / Null Result ReportOpen accessComputer Science

Bounded Memory Active Learning through Enriched Queries

Max Hopkins, Daniel Kane, Shachar Lovett et al. · 2021 · arXiv

The explosive growth of easily-accessible unlabeled data has lead to growing interest in active learning, a paradigm in which data-hungry learning algorithms adaptively select informative examples in order to lower prohibitively expensive labeling costs. Unfortunately, in standard worst-case models of learning, the active setting often provides no improvement over non-adaptive algorithms. To combat this, a series of recent works have considered a model in which the learner may ask enriched queries beyond labels. While such models have seen success in drastically lowering label costs, they tend

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Negative / Null Result ReportOpen accessComputer Science

The Capacity of MIMO Channels with Per-Antenna Power Constraint

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

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Failed Experiment Report

Automatic debugging approaches for fixating failed system programs

Gulista Khan · 2021 · Asian Journal of Multidimensional Research

Fixing broken computer programs entails performing two basic debugging tasks: first, the programmer must recreate the problem; second, the programmer must identify the source of the failure. As a consequence of testing, software debugging…

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Negative / Null Result ReportOpen accessComputer Science

Logistic Regression: Tight Bounds for Stochastic and Online Optimization

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

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Negative / Null Result ReportOpen accessComputer Science

Covering models of the asymmetric quantum Rabi model: $η$-shifted non-commutative harmonic oscillators

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

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Negative / Null Result ReportOpen accessComputer Science

Benchmarking Pretrained Molecular Embedding Models For Molecular Representation Learning

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

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Negative / Null Result Report

Patients’ daily reporting of symptoms via mobile application reveals a significant difference between patients’ perceptions and doctors’ interpretations

Cvetka Grašič Kuhar, Nina Privšek, Marjetka Sraka et al. · 2025 · Frontiers in Oncology

Purpose Electronic patient-reported outcomes (ePROs) are gaining importance. The aim of this study was to investigate the difference in the reporting of symptoms between patients via mobile application (m-app) and doctor assessments.…

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Negative / Null Result ReportMedicine

Effect of visual disruption on the lower limb kinematic and kinetic characteristics in athletes after anterior cruciate ligament reconstruction.

Yu, Yu, Sun et al. · 2026 · Frontiers in bioengineering and biotechnology

Proprioceptive deficits following anterior cruciate ligament (ACL) injury increase reliance on visual input in athletes after ACL reconstruction (ACLR). Visual disruption may therefore alter movement patterns and increase re-injury risk.…

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Abandoned HypothesisOpen accessComputer Science

Adaptive estimation of a time-varying phase with coherent states: smoothing can give an unbounded improvement over filtering

Kiarn T. Laverick, Howard M. Wiseman, Hossien T. Dinani et al. · 2017 · arXiv

The problem of measuring a time-varying phase, even when the statistics of the variation is known, is considerably harder than that of measuring a constant phase. In particular, the usual bounds on accuracy - such as the $1/(4\bar{n})$ standard quantum limit with coherent states - do not apply. Here, restricting to coherent states, we are able to analytically obtain the achievable accuracy - the equivalent of the standard quantum limit - for a wide class of phase variation. In particular, we consider the case where the phase has Gaussian statistics and a power-law spectrum equal to $κ^{p-1}/|ω

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Negative / Null Result ReportOpen accessComputer Science

Coherent-Classical Estimation versus Purely-Classical Estimation for Linear Quantum Systems

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

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Negative / Null Result ReportOpen accessComputer Science

Evolution of black hole shadow in the presence of ultralight bosons

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

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Negative / Null Result ReportOpen accessComputer Science

An Improvement Over Threads Communications on Multi-Core Processors

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

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Negative / Null Result Report

Features of the stress-strain state of the support-ing frame of a residential building in conditions of a significant difference in the stiffness of the elements of the “base – foundation – building” system

Oleksandr LYTVYN, Vitalii RUCHKIVSKYI · 2026 · Bases and foundations

The paper presents the results of numerical modeling of the stress-strain state (SSS) of the foundations of a multi-storey residential building with social and cultural facilities and an underground parking in the Shevchenkivskyi district…

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Negative / Null Result Report

No significant difference in skin contamination during anterior cruciate ligament reconstruction with and without preoperative skin cleaning

Benjamin Bartek, Alexandra Völkner, Stephan Oehme et al. · 2024 · Knee Surgery, Sports Traumatology, Arthroscopy

Abstract Purpose This prospective study aimed to assess whether preoperative antiseptic skin cleansing reduces bacterial contamination and surgical site infections (SSI) following anterior cruciate ligament reconstruction (ACLR). We…

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