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 accessEngineering
Nikhil Raghav, Subhajit Saha, Md Sahidullah et al. · 2024 · arXiv
In this report, we describe the speaker diarization (SD) and language diarization (LD) systems developed by our team for the Second DISPLACE Challenge, 2024. Our contributions were dedicated to Track 1 for SD and Track 2 for LD in multilingual and multi-speaker scenarios. We investigated different speech enhancement techniques, voice activity detection (VAD) techniques, unsupervised domain categorization, and neural embedding extraction architectures. We also exploited the fusion of various embedding extraction models. We implemented our system with the open-source SpeechBrain toolkit. Our fin
Negative / Null Result ReportOpen accessMathematics
Courtney Paquette, Elliot Paquette · 2021 · arXiv
We analyze a class of stochastic gradient algorithms with momentum on a high-dimensional random least squares problem. Our framework, inspired by random matrix theory, provides an exact (deterministic) characterization for the sequence of loss values produced by these algorithms which is expressed only in terms of the eigenvalues of the Hessian. This leads to simple expressions for nearly-optimal hyperparameters, a description of the limiting neighborhood, and average-case complexity. As a consequence, we show that (small-batch) stochastic heavy-ball momentum with a fixed momentum parameter pr
Negative / Null Result ReportOpen accessComputer Science
Donny Cheung, Dmitri Maslov, Jimson Mathew et al. · 2007 · arXiv
We consider a quantum polynomial-time algorithm which solves the discrete logarithm problem for points on elliptic curves over $GF(2^m)$. We improve over earlier algorithms by constructing an efficient circuit for multiplying elements of binary finite fields and by representing elliptic curve points using a technique based on projective coordinates. The depth of our proposed implementation, executable in the Linear Nearest Neighbor (LNN) architecture, is $O(m^2)$, which is an improvement over the previous bound of $O(m^3)$ derived assuming no architectural restrictions.
Negative / Null Result ReportOpen accessPhysics
Tim Gould · 2012 · arXiv
The "ACFD-RPA" correlation energy functional has been widely applied to a variety of systems to successfully predict energy differences, and less successfully predict absolute correlation energies. Here we present a parameter-free exchange-correlation kernel that systematically improves absolute correlation energies, while maintaining most of the good numerical properties that make the ACFD-RPA numerically tractable. The "RXH" kernel is constructed to approximate the true exchange kernel via a carefully weighted, easily computable radial averaging. Correlation energy errors of atoms with two t
Negative / Null Result ReportOpen accessPhysics
David M. Jacobs, Gwyneth Allwright, Mpho Mafune et al. · 2015 · arXiv
At present, the best model for the evolution of the cosmos requires that dark matter make up approximately $25\%$ of the energy content of the Universe. Most approaches to explain the microscopic nature of dark matter, to date, have assumed its composition to be of intrinsically weakly interacting particles; however, this need not be the case to have consistency with all extant observations. Given decades of inconclusive evidence to support any dark matter candidate, there is strong motivation to consider alternatives to the standard particle scenario. One such example is macro dark matter, a
Negative / Null Result ReportOpen accessComputer Science
Cristopher Moore, Alexander Russell, Piotr Sniady · 2006 · arXiv
It is known that any quantum algorithm for Graph Isomorphism that works within the framework of the hidden subgroup problem (HSP) must perform highly entangled measurements across Ω(n \log n) coset states. One of the only known models for how such a measurement could be carried out efficiently is Kuperberg's algorithm for the HSP in the dihedral group, in which quantum states are adaptively combined and measured according to the decomposition of tensor products into irreducible representations. This ``quantum sieve'' starts with coset states, and works its way down towards representations whos
Negative / Null Result ReportOpen accessComputer Science
Esther Ezra, Micha Sharir · 2021 · arXiv
We consider several problems that involve lines in three dimensions, and present improved algorithms for solving them. The problems include (i) ray shooting amid triangles in $R^3$, (ii) reporting intersections between query lines (segments, or rays) and input triangles, as well as approximately counting the number of such intersections, (iii) computing the intersection of two nonconvex polyhedra, (iv) detecting, counting, or reporting intersections in a set of lines in $R^3$, and (v) output-sensitive construction of an arrangement of triangles in three dimensions. Our approach is based on the
Negative / Null Result ReportOpen accessComputer Science
A. N. Antonov, M. V. Ivanov, M. K. Gaidarov et al. · 2006 · arXiv
The scaling function $f(ψ')$ for medium and heavy nuclei with $Z\neq N$ for which the proton and neutron densities are not similar is constructed within the coherent density fluctuation model (CDFM) as a sum of the proton and neutron scaling functions. The latter are calculated in the cases of $^{62}$Ni, $^{82}$Kr, $^{118}$Sn, and $^{197}$Au nuclei on the basis of the corresponding proton and neutron density distributions which are obtained in deformed self-consistent mean-field Skyrme HF+BCS method. The results are in a reasonable agreement with the empirical data from the inclusive electron
Negative / Null Result Report
Jatrya , Sampe Hotlan Sitorus , Uray Ristian · 2020 · Coding Jurnal Komputer dan Aplikasi
Citra telah diterapkan dalam kehidupan sehari-hari. Penerapannya pada bidang kesehatan, pendidikan, hiburan,seni, hukum, dan bisnis. Citra dapat disisipkan pesan rahasia. Penyisipan tersebut disebut sebagai teknik steganografi. Teknik…
View details →DOI: 10.26418/coding.v8i1.39195 Negative / Null Result Report
Uchechi Vanessa Alintah-Abel, Francisca Nkachukwu Okeke, Eucharia Chika Enebe · 2025 · British Journal of Multidisciplinary and Advanced Studies
The goal of most countries is the desire to maintain a stable price level of goods and services. This however, appears to be an uphill task given the incidence of subsidy removal that is presently ravaging the developing economies of the…
View details →DOI: 10.37745/bjmas.2022.04253 Negative / Null Result Report
Dennys De La Torre, Jaime Luyo, Arturo Ortega · 2024 · Journal of Offshore Mechanics and Arctic Engineering
Abstract When estimating significant wave height and wave power, it is regularly assumed 4 for the spectral estimate factor. It means considering a narrowband wave spectrum. That approach is accurate enough when the spectral broadness…
View details →DOI: 10.1115/1.4064501 Negative / Null Result Report
Indriani Indriani, Astrid Putri Pratiwi, Jauhara Jauhara et al. · 2023 · SIGNIFICANT : Journal Of Research And Multidisciplinary
Upaya menanamkan perilaku yang baik, mulia pada anak merupakan pendidikan karakter pada anak usia dini. Lingkungan dimana anak berada dapat menjadi bagian dari pendidikan karakter anak. Keluarga adalah lingkungan pertama bagi anak sehingga…
View details →DOI: 10.62668/significant.v1i02.650 Negative / Null Result Report
Offdan Narvaez-Guerra, Evan Offord, Mawulorm Denu et al. · 2024 · Circulation
Background: Coronary Computed Tomography Angiography (CCTA) and CT-derived fractional flow reserve (CT-FFR) accurately assess the severity of coronary artery disease. However, the diagnostic accuracy of CT-FFR in patients with low left…
View details →DOI: 10.1161/circ.150.suppl_1.4138602 Negative / Null Result Report
· 2021 · Advances in Bioengineering and Biomedical Science Research
Nowadays metal implants are a major source of metal exposure. Contact allergy to nickel, cobalt and chromium is one of the most prevalent allergic reactions in humans with contact dermatitis; up to 17% of women and 3% of men. Setting up…
View details →DOI: 10.33140/abbsr.04.03.04 Negative / Null Result Report
Björn Jörges, Laurence R. Harris · 2025 · PLOS One
For many years the accepted wisdom in vision science has been that humans tend to underestimate the speed of an object when they pursue it with their gaze in comparison to when they fixate a spot in the visual scene and the object moves…
View details →DOI: 10.1371/journal.pone.0324420 Negative / Null Result Report
Erik Huesca Burela · 2026 · Revista Mexicana de Economía y Finanzas
This paper aims to determine whether a transparent, vendor-style bond pricing framework built exclusively from public information can match the pricing accuracy of institutional vendors. The methodology constructs Treasury-based yield…
View details →DOI: 10.21919/remef.v21i2.1430 Negative / Null Result Report
Volkan Davut Mengi · 2025 · EON
Training artificial intelligence applications by uploading visuals is a form of converting visual data into another. Subsequently, generating visuals by prompting with trained artificial intelligence is an operation of transforming…
View details →DOI: 10.56177/eon.6.2.2025.art.3 Negative / Null Result Report
Frederic Blum · 2026 · Linguistic Typology
Abstract The statistical over-representation of certain phonological features in the basic vocabulary of languages is often interpreted as reflecting potentially universal sound symbolic patterns. However, most of these cases have not been…
View details →DOI: 10.1515/lingty-2025-0050 Negative / Null Result Report
Katherine Kornei · 2023 · Eos
Data from NASA’s Lunar Reconnaissance Orbiter have been instrumental in pinpointing where other Moon-bound spacecraft have crashed.
View details →DOI: 10.1029/2023eo230374 Negative / Null Result Report
· 2025 · European Journal of Clinical Pharmacy
Pediatric nephrolithiasis is an increasing concern and often requires complete stone clearance due to high recurrence risk. Managing large renal stones (>2 cm), lower calyceal stones (>1 cm), and stones refractory to Extracorporeal Shock…
View details →DOI: 10.61336/ejcp/25-08-441 Negative / Null Result Report
Hayley Walker, Rolf Scharfbillig, Sara Jones · 2021 · Journal of the American Podiatric Medical Association
Background The neutral calcaneal stance position (NCSP), despite its known issues, is currently used as an “ideal” measure compared with the resting stance position in clinical podiatric medicine. The nonweightbearing (NWB) foot position,…
View details →DOI: 10.7547/19-133 Negative / Null Result Report
· 2021 · Journal of Gynecology & Reproductive Medicine
Different forms of exogenous progesterone have been seen to play a very important role in endometrial maturity. Implantation failure appears to be a significant factor in Assisted reproductive technique (ART) procedures. Even a mature…
View details →DOI: 10.33140/jgrm.05.01.08 Negative / Null Result Report
Peter W. Schofield, John Attia, Houman Ebrahimi · 2023 · Alzheimer's & Dementia
Abstract Background We previously published data showing that olfactory test performance changes on the University of Pennsylvania Smell Identification Test (UPSIT) following an intranasal ‘challenge’ with the anticholinergic atropine (an…
View details →DOI: 10.1002/alz.078041 Negative / Null Result ReportMedicine
Ding, Lou, Liang et al. · 2026 · Journal of animal science and biotechnology
Amuc_1100, the most abundant outer membrane protein of Akkermansia muciniphila, alleviates high-fat diet (HFD)-induced hepatic lipid accumulation and modulates gut microbiota in fish; however, its mechanism and mediators remain unknown.…
View details →DOI: 10.1186/s40104-026-01418-7 Negative / Null Result Report
Dr. Ambrues Monboe Nebo · 2023 · International Journal of Research and Scientific Innovation
From a qualitative comparative analysis method, this article assesses the possibility of Liberia replicating the Singapore experience as one of the least corrupt Countries in the world. Regarding fighting corruption, the study identified…
View details →DOI: 10.51244/ijrsi.2023.10603 