Negative / Null Result ReportOpen accessEconomics, Econometrics and Finance
Claudiu Albulescu · 2020 · arXiv
This paper investigates the effect of the novel coronavirus and crude oil prices on the United States (US) economic policy uncertainty (EPU). Using daily data for the period January 21-March 13, 2020, our Autoregressive Distributed Lag (ARDL) model shows that the new infection cases reported at global level, and the death ratio, have no significant effect on the US EPU, whereas the oil price negative dynamics leads to increased uncertainty. However, analyzing the situation outside China, we discover that both new case announcements and the COVID-19 associated death ratio have a positive influe
Negative / Null Result ReportOpen accessPhysics
Takashi Hamana · 1998 · arXiv
Weyl focusing effects on the image magnifications are investigated by using the multiple gravitational lens theory. We focus on the gravitational lensing effects due to the small scale virialized objects, such as galaxies and clusters of galaxies. We consider a simple model of an inhomogeneous universe. The matter distribution in the universe is modeled by randomly distributed isothermal objects. We found that, for the majority of the random lines of sight, the Weyl focusing has no significant effect and the image magnification of a point like source within redshift of 5 is dominated by the Ri
Negative / Null Result ReportOpen accessPhysics
Sarbani Basu, H. M. Antia · 2004 · arXiv
Recent analyses of solar photospheric abundances suggest that the oxygen abundance in the solar atmosphere needs to be revised downwards. In this study we investigate the consequence of this revision on helioseismic analyses of the depth of the solar convection zone and the helium abundance in the solar envelope and find no significant effect. We also find that the revised abundances along with the current OPAL opacity tables are not consistent with seismic data. A significant upward revision of the opacity tables is required to make solar models with lower oxygen abundance consistent with sei
Negative / Null Result ReportOpen accessComputer Science
Thomas M. Breuel · 2015 · arXiv
LSTM (Long Short-Term Memory) recurrent neural networks have been highly successful in a number of application areas. This technical report describes the use of the MNIST and UW3 databases for benchmarking LSTM networks and explores the effect of different architectural and hyperparameter choices on performance. Significant findings include: (1) LSTM performance depends smoothly on learning rates, (2) batching and momentum has no significant effect on performance, (3) softmax training outperforms least square training, (4) peephole units are not useful, (5) the standard non-linearities (tanh a
Negative / Null Result ReportMedicine
Makkar RR, Chakravarty T, Gupta A et al. · 2025 · Journal of the American College of Cardiology
Background In the ACURATE IDE (Safety and Effectiveness Study of ACURATE Valve for Transcatheter Aortic Valve Replacement) randomized controlled trial, ACURATE neo2 failed to show noninferiority to commercially available balloon-expandable…
View details →DOI: 10.1016/j.jacc.2025.05.011 Negative / Null Result ReportOpen accessComputer Science
Imam tahyudin · 2013 · arXiv
The purpose of this research was to determine the influence of Internet Retail Service Quality (IRSQ) (website performance, access, security, sensation, and information) to the satisfaction www.kebanaran.com online shoppers. The method of analysis used was path analysis. Based on the research results influence IRSQ variables (performance, access, sensation, and information security), performance variables (X1), access (X2) and sensation (X3) had no significant effect on satisfaction (Y). It showsthat the online shopping website www.kebanaran.com already apply standard terms online stores in ge
Negative / Null Result ReportOpen accessPhysics
L. R. Abramo, R. P. Woodard · 1998 · arXiv
We consider quantum mechanical corrections to a homogeneous, isotropic and spatially flat geometry whose scale factor expands classically as a general power of the co-moving time. The effects of both gravitons and the scalar inflaton are computed at one loop using the manifestly causal formalism of Schwinger with the Feynman rules recently developed by Iliopoulos {\it et al.} We find no significant effect, in marked contrast with the result obtained by Mukhanov {\it et al.} for chaotic inflation based on a quadratic potential. By applying the canonical technique of Mukhanov {\it et al.} to the
Negative / Null Result ReportOpen accessPhysics
Ulrich Kolb, Isabelle Baraffe · 1999 · arXiv
Using improved, up-to-date stellar input physics tested against observations of low-mass stars and brown dwarfs we calculate the secular evolution of low-mass donor cataclysmic variables (CVs), including those which form with a brown dwarf donor. Our models confirm the mismatch between the calculated minimum period (Pmin ~ 70 min) and the observed short-period cut-off (~ 80 min) in the CV period histogram. We find that tidal and rotational corrections applied to the one-dimensional stellar structure equations have no significant effect on the period minimum. Theoretical period distributions sy
Negative / Null Result ReportOpen accessPhysics
X. S. Wu, P. W. Adams, Y. Yang et al. · 2005 · arXiv
We present a detailed study of the effects of interface spin-orbit coupling (ISOC) on the critical field behavior of non-centrosymmetric (NCS), ultra-thin superconducting Be/Au bilayers. Parallel field measurements were made in bilayers with Be thicknesses in the range of 2 - 10 nm and Au coverages of 0.5 nm. Though the Au had no significant effect on the superconducting gap, it produced profound changes in the spin states of the system. In particular, the parallel critical field exceeded the Clogston limit by an order of magnitude in the thinnest films studied. In addition, the parallel criti
Negative / Null Result ReportOpen accessComputer Science
Bruce W. Lee, JaeHyuk Lim · 2024 · arXiv
We argue that language-only models don't learn the physical manifestation of language. We present an empirical investigation of visual-auditory properties of language through a series of tasks, termed H-Test. These tasks highlight a fundamental gap between human linguistic understanding and the sensory-deprived linguistic understanding of LLMs. In support of our hypothesis, 1. deliberate reasoning (Chain-of-Thought), 2. few-shot examples, or 3. stronger LLM from the same model family (LLaMA 2 13B -> LLaMA 2 70B) has no significant effect on H-Test performance. We bring in the philosophical cas
Negative / Null Result ReportOpen accessPhysics
Stephen C. Thompson, Richard J. Meyer, Douglas C. Markley · 2013 · arXiv
Underwater acoustic transducers often include a stack of thickness polarized piezoelectric material pieces of alternating polarity interspersed with electrodes, bonded together and electrically connected in parallel. The stack is normally much shorter than a quarter wavelength at the fundamental resonance frequency, so that the mechanical behavior of the transducer is not affected by the segmentation. When the transducer bandwidth is less than a half octave, as has conventionally been the case, stack segmentation has no significant effect on the mechanical behavior of the device. However, when
Negative / Null Result ReportOpen accessPhysics
Benjamin Poole, Bartosz Barzdajn, Daniele Dini et al. · 2019 · arXiv
The thermal effects of plastic and frictional heat generation and elevated temperature were examined along with the role of adhesion in the context of galling wear, using a representative crystal plasticity, normally loaded, sliding surface model. Galling frequency behaviour was predicted for 316L steel. Deformation of the surfaces was dominated by the surface geometry, with no significant effect due to variations in frictional models. Plastic and frictional heating were found to have a minimal effect on the deformation of the surface, with the rapid conduction of heat preventing any highly lo
Negative / Null Result ReportOpen accessComputer Science
Varun Kotte · 2026 · arXiv
Prompt-only, single-step LLM query rewriting, where a rewrite is generated from the query alone without retrieval feedback, is commonly used in production RAG pipelines, but its effect on dense retrieval is poorly understood. We present a systematic empirical study across three BEIR benchmarks, two dense retrievers, and multiple training configurations, and find strongly domain-dependent behavior: rewriting degrades nDCG@10 by 9.0 percent on FiQA, improves it by 5.1 percent on TREC-COVID, and has no significant effect on SciFact. We identify a consistent mechanism: degradations co-occur with r
Negative / Null Result ReportOpen accessAgricultural and Biological Sciences
Anna Seigal, Portia Mira, Bernd Sturmfels et al. · 2016 · arXiv
Nosocomial outbreaks of bacteria are well-documented. Based on these incidents, and the heavy usage of antibiotics in hospitals, it has been assumed that antibiotic resistance evolves in hospital environments. To test this assumption, we studied resistance phenotypes of bacteria collected from patient isolates at a community hospital over a 2.5-year period. A graphical model analysis shows no association between resistance and patient information other than time of arrival. This allows us to focus on time course data. We introduce a Hospital Transmission Model, based on negative binomial delay
Negative / Null Result ReportOpen accessPhysics
Peter Erwin, Linda S. Sparke · 2002 · arXiv
We present results from an imaging survey of an unbiased sample of thirty-eight early-type (S0--Sa), low-inclination, optically barred galaxies in the field. Our goal was to find and characterize central stellar and gaseous structures: secondary bars, inner disks, and nuclear rings. Bars inside bars are surprisingly common: at least one quarter of the sample galaxies (possibly as many as 40%) are double-barred, with no preference for Hubble type or the strength of the primary bar. A typical secondary bar is ~12% of the size of its primary bar and 240--750 pc in radius. We see no significant ef
Negative / Null Result ReportOpen accessPhysics
D. Apai, M. R. Meyer, P. Hinz et al. · 2007 · arXiv
We present results from two high-contrast imaging surveys that exploit a novel technique, L-band angular differential imaging. Our first survey targeted 21 young stars in the Beta Pic and Tuc-Hor moving groups with VLT/NACO reaching typical sensitivities of 20 AU. The statistical analysis of the null result demonstrates that the giant planet population is truncated at 30 AU or less (90% confidence level). Our second, on-going MMT/Clio survey utilizes the unique sensitivity achieved in the L-band for old planets to probe all M-dwarf stars within 6 pc. The proximity of these targe
Negative / Null Result ReportMedicine
Mohammed Abdul, Bernard, Yates · 2026 · Cureus
Background The optimal choice of polyethylene insert in total knee arthroplasty (TKA) continues to cause contention. Rotating platform bearings (RP) have theoretical advantages but have failed to demonstrate a functional difference…
View details →DOI: 10.7759/cureus.109613 Negative / Null Result ReportMedicine
Geysenbergh, Debrock, Lie Fong et al. · 2026 · Human reproduction (Oxford, England)
Does a natural cycle result in higher clinical pregnancy rates (CPR) with foetal heartbeat compared to an artificial cycle for frozen-thawed embryo transfer (FET) preparation in ovulatory women? The CPR with foetal heartbeat did not differ…
View details →DOI: 10.1093/humrep/deag095 Negative / Null Result ReportMedicine
El-Tanani, Wali, Rabbani et al. · 2026 · Pharmaceuticals (Basel, Switzerland)
In spite of plausible biology, the majority of oncology trials involving drug repurposing have failed to demonstrate any efficacy. Numerous factors can potentially cause failure, including issues with dosing, drug strength, the trial…
View details →DOI: 10.3390/ph19060957 Negative / Null Result ReportOpen accessPhysics
Chuan-Ren Chen, Yu-Kuang Chu, Ho-Chin Tsai · 2015 · Physics Letters B
Even though the sensitivity of direct dark matter search experiments reaches the level of about 10−45 cm2, no confident signal of dark matter has been observed. We point out that, if dark matter is a vector boson, the null result in direct dark matter search experiments may be due to the destructive effects in dark-matter–nucleon elastic scattering. We illustrate the scenario using a modified Higgs portal model that includes exotic quarks. The significant cancellation can occur for a certain mass gap between new heavy quark and dark matter. As a result, the spin-independent dark-matter–nucleon
View details →DOI: 10.1016/j.physletb.2014.12.043 Negative / Null Result ReportOpen accessEducation
Yuli Christiana Yoedo, Anita Octaviani, Dani Puspitasari · 2025 · Journal of Digital Learning and Education
This study aims to determine the influence of MindMeister on 4C skills in the Indonesian language subject in grade 6 elementary school in Surabaya. A combined research method was used, involving data collection carried out through in-depth interviews with students, observation, taking pre-test and post-test scores 3 times each in the control class and experimental class. Quantitative results showed no significant effect of using MindMeister on 4C skills (significance values of 0,100 > 0,05). However, the qualitative result based on the student's perspective gained through interviews and observ
View details →DOI: 10.52562/jdle.v5i1.1376 Negative / Null Result ReportOpen accessScience (General)
Hasan Kılıç, Zübeyir Türk · 2016 · Trakya University Journal of Natural Sciences
The study in which different soil tillage methods (conventional, reduced and zero tillage) and control methods of narrow leaved weeds were compared was carried out in dry farming conditions in Diyarbakır during growing season of the years 2004-2005. The weeds density, yield and yield components of lentil (Lens culinaris Medik.) were investigated. A significant difference was found between the herbicide applied (HER-1) and herbicide free groups (HER-2) (p<0.05) in terms of biological yield, harvest index, number of pods and seed per plant but there was no significant difference between the two
Negative / Null Result ReportOpen accessBanking
Visita Yales Arma · 2014 · Journal of Business & Banking
Holding periods is the period of time during which one owns a security. In addition, holding period is influenced by transaction cost, market value, and risk. The objective of this research is to analyze the effect of bid-ask spread, market value, and variance return on holding period. The analysis of the data was done by multiple regression analysis. Using the data from 34 companies in LQ-45 index period 2010-2011, the results show that market value has positive effect and variance return has negative effect on holding periods. Theresults also show that Bid-Ask spread has no significant effec
View details →DOI: 10.14414/jbb.v3i2.237 Negative / Null Result ReportOpen accessBusiness
Budi Tay, Didi Sundiman · 2021 · DeReMa (Development Research of Management): Jurnal Manajemen
This study aims to determine green product innovation and green innovation processes on sustainable performance and whether there is an influence of managerial environmental concern that acts as a moderation. This study uses sampling method in the form of non-probability sampling. The sampling technique used in this study used purposive sampling. The analytical method used in this research is a quantitative analysis method. The results of this study indicate that green product innovation has no significant effect on sustainable performance, the green process innovation has a significant effect
View details →DOI: 10.19166/derema.v16i1.2505 Negative / Null Result ReportOpen accessAnimal culture
H Nasiri Mogadam, M Azadegan Mehr, L Zartash et al. · 2012 · پژوهشهای علوم دامی ایران
An experiment was conducted to examine the effect of different levels of extruded soybean and enzyme on broiler performance. In a completely randomized design with 2×3 factorial arrangement, 480 one day-old, Ross broiler chickens were divided into 40 groups, 12 chicks per pen. Treatments were consisting of combination of four levels of extruded soybean (0.0, 5.0, 10.0 and 15.0 %) and two levels of enzyme (0.0 and 500 g per ton). Different levels of extruded soybean and enzyme had no significant effect on blood factors such as cholesterol, triglyceride and the weight of liver and heart. The usa
Negative / Null Result ReportOpen accessFinance
Iwan Budiyono, Chansera Kista Sabilla · 2021 · Al-Arbah
Purpose - This study aims to analyze the influence of audit committees, sharia supervisory boards, and Islamic work ethic on the quality of islamic bank financial statements in Indonesia. Method - The method in this study used Multiple Linear Regression Analysis with SPSS software tools. Result - Based on the results of this research, simultaneously the audit committee, sharia supervisory board, and Islamic work ethic have a significant influence on the quality of islamic bank financial statements in Indonesia. Meanwhile, in part, the audit committee and islamic work ethic have no significant
View details →DOI: 10.21580/al-arbah.2021.3.1.8066 Negative / Null Result ReportOpen accessIndustrial electrochemistry
H.E. Yun-long, X.U. Rui-dong, H.E. Shi-wei et al. · 2018 · International Journal of Electrochemical Science
The effects of sodium lignosulfonate (SLS) on bismuth electrochemical deposition on copper surfaces from HCl-NaCl-BiCl3 solution were investigated. Cyclic voltammetry studies indicated that the Bi3+ ions could be reduced electrolytically to bismuth on the surface of copper in the presence of different concentrations of SLS and that 0.3 g/L of SLS was beneficial for the electroreduction of Bi3+. The cathodic polarization study indicated that SLS had a noticeable effect on the Tafel slope and exchange current density but no significant effect on the transfer coefficients. SEM images revealed tha
View details →DOI: 10.20964/2018.08.52 Negative / Null Result ReportOpen accessAgriculture
A.E.A. Mahgoob · 2006 · Arab Universities Journal of Agricultural Sciences
In field study, Eleven mango varieties, (Mangiferae indica L.) at Sharkia, Ismailia, and Fayoum Governorates, were examined to estimate the population fluctuation of the bud mite Eriophyes mangiferae Sayed, their susceptibility to mite infestation, the relation between the mite infestation and chemical contents of mango buds and the correlation between the bud mite and malformation disease. The highest population occurred during Sept. to Jan. or Feb. and the lowest population was existed during Mar. to Jun. Temperature and relative humidity had no significant effect on the mite population. The
View details →DOI: 10.21608/ajs.2006.15582 Negative / Null Result ReportOpen accessPlant culture
J. Harb, A. A. Saquet, R. Bisharat et al. · 2012 · Journal of Applied Botany and Food Quality
Biochemical and quality changes of sweet cherries cv. Regina were assessed over three consecutive years after storage in different modified atmosphere packaging (MAP) liners, with or without hydrocooling, compared to regular atmosphere (RA) storage. All plastic liners used in the experiment resulted in CO2-enrichment and O2-reduction inside packages, with the following impact on fruit quality after five weeks of storage: improved retention of fruit firmness and red color of skin, no significant effect on acidity and total soluble solids, and minimal loss of fruit weight. Fruit decay was absent
Negative / Null Result ReportOpen accessAgriculture
Ondřej Sedlář, Jiří Balík, Jindřich Černý et al. · 2025 · Agronomy
Humic substances affect both soil fertility and carbon sequestration. This study aimed to evaluate the effect of straw return on the quality of soil organic matter on arable land commonly farmed by private farmers at 65 different sites between 2012 and 2022 in the Czech Republic (central Europe). In this study, most of the carbon supply was applied in straw (67% of the carbon input on average). No significant correlation between the total carbon input and both parameters of soil organic matter quality and soil organic carbon content was found. The ratio of optical absorbance at 465 to 665 nm (
View details →DOI: 10.3390/agronomy15061277 