Double-base Research Articles

Analysis of SSR Sites Base on Transcriptome of Pinellia ternata in Guizhou, China

This study collected SSR information from transcriptome samples of Pinellia ternata (P.T) from different regions in order to provide some reference for germplasm resources and genetic breeding of P.T. samples from six regions were selected as research objects. The frequency of SSR site, types of motifs, composition of motifs, and average distance was analyzed by Excel software. The results showed that there were 32,061–67,917 unigene sequences and 11,109–22,540 SSR site in the six P.T species, with a frequency of 32.7%–35.8% and an average distance of 2.65 kb–3.17 kb. The six SSR repeat types for P.T were mainly double base, triple base and Mononucleotide repeats. The number composition of dominant repeat motifs in the six P.T species from Mononucleotide to Tetranucleotide was basically the same, which were A/T, AG/CT, CCG/CGG and AGCT/AGCT, respectively. Most SSR sites were less than or equal to 30 bp in length, and the number of these SSRs accounted for 81.2%–82.3% of the total. It can be seen from the above results that, the transcriptome of P.T in different regions was rich in SSR types and high in polymorphisms, which can provide a basis for germplasm difference identification, genetic breeding and other research of P.T.

A comprehensive investigation of the impact of carbon-supported metal complexes of triaminoguanidine on the characteristics of a double-base propellant

ABSTRACT In this study, triaminoguanidine complexes grafted onto activated carbon (AC-TAG-Fe and AC-TAG-Co) were designed and investigated for their catalytic effect on the thermolysis of a double base propellant consisting of nitrocellulose (NC) and diethylene glycol dinitrate (DEGDN). The successful synthesis of transition metal complexes with triaminoguanidine and their subsequent grafting onto activated carbon were confirmed using various analytical techniques, including Fourier Transform Infrared Spectroscopy, Raman Spectroscopy, X-ray Diffraction, and Scanning Electron Microscopy. Thermal characterization using Thermogravimetric Analysis and Differential Scanning Calorimetry provided valuable insights into the thermal properties and reactivity of the elaborated NC/DEGDN-based composites. Importantly, the addition of various additives resulted in notable improvements in both the enthalpy of reaction and density. Isoconversional kinetic studies revealed that the incorporation of TAG-Fe and TAG-Co complexes reduced the apparent activation energy of the NC/DEGDN composite from 137.4 kJ/mol to 135.4 kJ/mol and 114.8 kJ/mol, respectively, suggesting their catalytic effect. Furthermore, it is found that the addition of activated carbon (AC) resulted in an increase in activation energy to 154 kJ/mol, whereas grafting TAG-Fe and TAG-Co complexes onto AC as a catalytic support subsequently reduced activation energy to 119 kJ/mol and 112 kJ/mol, respectively. Overall, this research serves as a valuable reference for future studies focusing on investigating the catalytic combustion characteristics of double-base solid propellants.

Post-Burn and Post-Blast Rapid Detection of Trace and Bulk Energetics by 3D-Printed Cone Spray Ionization Mass Spectrometry

Forensic analysis of post-blast and post-burn materials can be critical to a law enforcement or military investigation. 3D-printed cone spray ionization (3D-PCSI) coupled to a field portable mass spectrometer (MS) has been demonstrated as a rapid and low-cost alternative to traditional laboratory-based techniques (high resolution liquid or gas chromatography mass spectrometry) for the detection and analysis of energetic materials. 3D-PCSI-MS can sample trace or bulk energetics within or upon solid matrices with no sample preparation. Solid samples, in this case post-blast or post-burn energetics, are placed within the hollow cavity of the cone that has an approximately 100 µm spray-based emitter at the apex. An extraction/spray solvent is added, and a high voltage is subsequently applied. When coupled to a field portable MS, post-burn and post-blast analyses can be performed in the field. Double base propellant was burned on a variety of substrates and examined via 3D-PCSI-MS. An energetic material and stabilizers used in propellants were detected from the post-burn samples with no sample preparation. Trinitrotoluene (TNT, used in military and commercial explosives) and triacetone triperoxide (TATP, a homemade explosive) were examined post-blast on the US ton scale and the gram scale, respectively.

SONIC EQUITY

SONIC EQUITY This exposition investigates questions of inclusion, equity, and decolonisation through the central voice of the Brazilian berimbau. Drawing on the approaches of artistic research, musical case studies are employed to investigate the core concepts, including the solo berimbau work of Adriano Adewale, as well as duo dialogues between Adriano Adewale on berimbau and Nathan Riki Thomson on double bass, seen through the conceptual lens of third space. Findings emerge in terms of uncovering and reimagining the unique, experimental sonic possibilities of the berimbau and the ways they can be utilized for artistic expression in both solo and duo playing. Through shining a light on the unique possibilities of the berimbau, questions arise in terms of why this instrument and its interconnected traditions have not been given equal space and value within higher music education, highlighting the need for institutions to continually reassess their policies through the lens of decolonisation. The artistic investigations further reveal issues related to the need for equity in music and music education, pointing towards a decolonised future where marginalized instruments such as the berimbau are given space and valued equally alongside all forms of musical expression. This connects back to the fundamental human need to be seen, acknowledged, and valued in our world, which is a commonality we can perhaps all relate to. Key words: berimbau, equity, decolonisation, interculturalism, higher music education, third space.

French versus German? The Over/Under on Double Bass Bow Holds

French versus German? The Over/Under on Double Bass Bow Holds

Measurement of new qualitative productivity kinetic energy from the perspective of digital and green collaboration--comparative study based on European countries

At present, the world is witnessing the historic convergence of a new round of scientific and technological revolution and industrial change with the transformation of the development mode, and it is strategically important and far-reaching to rapidly enhance new qualitative productivity kinetic energy (NQPKE) on the basis of the lessons learning from the experience of the pioneering countries for all countries, so as to expand the room for manoeuvre of the economic development, obtain the initiative of international competition, and realise the benign interaction of high-quality development and high-level of security. On the basis of analysing the formation mechanism of NQPKE, we characterize NQPKE by the coupling and coordination degree of digital productivity and green productivity, we analyse NQPKE by using the entropy weight TOPSIS method and the coupling and synergistic model, and analyse the spatial-temporal characteristics, steady state development and constraints of NQPKE by using the method of kernel density estimation, the Markov chain, the spatial Markov chain, and the obstacle degree model based on data from 21 European countries from 2009 to 2022. The study finds that: (1) The NQPKE shows a wave-like development trend, and the polarization or multi-polarization state of the whole and the four major regions has been slowly weakened, with a certain degree of "club convergence" and "spatial spillover"; (2) The overall situation of barriers to NQPKE is relatively stable, the insufficient investment in scientific and technological development and weak technological innovation capacity are the most critical factors constraining the NQPKE in various countries. Based on the above conclusions, the article proposes to hold high the banner of peaceful development and win-win cooperation, give full play to the "club convergence" and "spatial spillover" effects of NQPKE, accelerate the development of NQPKE adapt to local conditions, and the "digital + green" double base will stimulate technological innovation, and the construction of a digital and green synergistic management system stimulates the potential of the new quality productivity of enterprises, ultimately unleash the surging kinetic energy of new quality productivity development.

Racism on Trial in U.S. Symphony Orchestras

Abstract This essay examines how racial discrimination operates under the surface and through the guise of preserving musical excellence, as exemplified through the 1969 lawsuit filed by double bassist Arthur Davis and cellist Earl Madison charging the New York Philharmonic with racial discrimination in hiring practices. Analyzing the narratives that emerged during the 1969 hearings around artistic merit, racial discrimination, and screened auditions, I argue that the New York Philharmonic weaponized musical excellence as a pure entity abstracted from race and other social categories in order to claim that its sanctity required protection from societal charges of discrimination. Notably, these same legal arguments were used in a subsequent case in which timpanist Elayne Jones charged the San Francisco Symphony with discrimination on the basis of race and sex following her tenure denial in 1974. Placing these two cases in conversation not only illuminates the tenacity and power of discriminatory ideas and practices in U.S. orchestras, but it also demonstrates how the experience of fighting legal battles reverberated personally and professionally for Black classical musicians. These lawsuits exacted a significant toll on Davis, Madison, and Jones, each of whom was sacrificed at the altar of change that, decades later, has yet to come.

Traditional Elements and Artistic Changes that Occur in the Music of the "Estudiantina Puneña" In Postmodernism in Puno, Peru: Studies on Behavior Change Towards Sustainability and Its Influence on the SDGS

Objective: The purpose of this research work is to analyze the changes in the musical structure in relation to the traditional elements of the Estudiantentina Puna in times of postmodernity as a practical theoretical element for the improvement of musical education, contributing to studies on the behavioral change towards sustainability and its influence on the SDGs. Theoretical Framework: The processes that have taken place over time, the defined categories of inquiry were described in an analytical manner. Method: Methodologically, the research corresponds to the qualitative paradigm at the level of ethnographic study. Results and Discussion: The interviews were conducted with the directors of the different musical centers in the Puno region, in which musical instruments have been incorporated to interpret the music of the Puno student from the 50s to the present, such as the saxophone and the trumpet. , with silence that are used for the Puno gang Research Implications: Nowadays it is observed in student carnivals with mandolins, with charangos, screamers, violins, accordions, quenas, classical acoustic double bass, the mariachi bass, the Puno guitarrón, percussion has also been added, which takes the third. element of music, rhythm, even the congas were incorporated into the Qotamarca musical center of Dr. Rolando Montes de oca from the city of Puno, Peru, which has a good sound, likewise there was an evolution where more development is given to the interpretation of each instrument, all the instruments. Contribution: The same melody is no longer played, they are dressed with more instrumentation, more work at a contrapuntal harmonic level, this research is a contribution to society and to the highest level institutions of the city of Puno.

Lithium-Ion Battery Health Assessment Method Based on Double Optimization Belief Rule Base with Interpretability

Health assessment is necessary to ensure that lithium-ion batteries operate safely and dependably. Nonetheless, there are the following two common problems with the health assessment models for lithium-ion batteries that are currently in use: inability to comprehend the assessment results and the uncertainty around the chemical reactions occurring inside the battery. A rule-based modeling strategy that can handle ambiguous data in health state evaluation is the belief rule base (BRB). In existing BRB studies, experts often provide parameters such as the initial belief degree, but the parameters may not match the current data. In addition, random global optimization methods may undermine the interpretability of expert knowledge. Therefore, this paper proposes a lithium-ion battery health assessment method based on the double optimization belief rule base with interpretability (DO-BRB-I). First, the belief degree is optimized according to the data distribution. Then, to increase accuracy, belief degrees and other parameters are further optimized using the projection covariance matrix adaptive evolution strategy (P-CMA-ES). At the same time, four interpretability constraint strategies are suggested based on the features of lithium-ion batteries to preserve interpretability throughout the optimization process. Finally, to confirm the efficacy of the suggested approach, a sample of the health status assessment of the B0006 lithium-ion battery is provided.

Clinical Interest in Exome-Based Analysis of Somatic Mutational Signatures for Non-Small Cell Lung Cancer.

Non-small cell lung cancer (NSCLC) remains the leading cause of cancer-related mortality. This study investigates the clinical interest of whole exome sequencing (WES) for analyzing somatic mutational signatures in patients with advanced or metastatic NSCLC treated with the current standard of care. Exome sequencing data and clinical characteristics from 132 patients with advanced or metastatic NSCLC were analyzed. Somatic mutational signatures including single base substitutions (SBSs), double base substitutions (DBSs), and copy number signatures were evaluated. Structural variations including tumor mutational burden (TMB), the number of neoantigens, TCR clonality, homologous recombination deficiency (HRD), copy number alterations (CNAs), and microsatellite instability (MSI) score were determined. The association between these genomic features, NSCLC subtypes, and patient outcomes (progression-free and overall survival) was evaluated. Exome sequencing offers valuable insights into somatic mutational signatures in NSCLC. This study identified specific signatures associated with a poor response to immune checkpoint inhibitor (ICI) therapy and chemotherapy, potentially aiding treatment selection and identifying patients unlikely to benefit from these approaches.

Theory-driven design of graphene-nickel gallate nanocomplex as functional catalyst for composite modified double base propellant

New graphene-nickel gallate nanocomplex (G-M-Ni) was designed, synthesized and characterized to deal with the requirement of functional combustion catalyst based on investigations of combustion mechanisms of propellant, structural analysis of catalyst and simulation results of quantum mechanics. The positive effect of G-M-Ni is not only reflected in the significantly increased burning rate, but also reflected in the reduction of friction sensitivity of composite modified double base (CMDB) propellant. The G-M-Ni nanocomplex exhibited significantly enhanced catalytic performances, and the burning rate of propellant at 20 MPa enhanced from 23.15 to 29.07 mm·s−1. Besides, the friction sensitivity of propellant reduced from 64 % to 36 % after addition of 0.5% G-M-Ni. The positive effect of G-M-Ni on CMDB propellant combustion is mainly attributed to its promotion impact on nitroglycerin (NG) pyrolysis, which significantly increased the differential charge density and decreased the decomposition activation energy (from 1.89 eV to 1.38 eV). The gas products produced by the rapid pyrolysis of NG are conducive to the heat feedback between the gas phase and the combustion surface, which makes the propellant have higher burning rate, bright flame, thin dark zone and flocculated quenching surface morphology. The findings in this study confirm the potential of G-M-Ni as a functional combustion catalyst for CMDB propellants, which has guiding significance and inspiration for the development of new combustion catalysts from the view of molecular-level insights. Novelty and significance statementRecently, graphene based functional combustion catalysts have attracted much attention in the field of solid propellants due to their excellent catalytic combustion performance, reduced sensitivity, and improved mechanical properties. Herein, novel graphene-nickel gallate nanocomplex (G-M-Ni) were designed, synthesized and characterized to deal with the to deal with the requirement of functional combustion catalyst based on investigations of combustion mechanisms of CMDB propellant, structural analysis of new material and simulation results of quantum mechanics. By taking graphene as the benchmark, the G-M-Ni nanocomplex exhibited significantly enhanced catalytic performances, and excellent effect on the reduction of friction sensitivity. The relationship between molecular structure of G-M-Ni and combustion characteristics of CMDB propellant were disclosed. The theory-driven design mode of this work may provide new pathways to tune combustion behaviors of CMDB propellants from the view of molecular-level insights.

EVALUATION OF SOLID ROCKET PROPELLANTS FOR LOW EARTH ORBIT

In contemporary aerospace technology, solid rocket propellants are commonly employed in the thriller and boost of space cargoes to LEO. These are reliable, uncomplicated, and high in thrust; and thus, can be used in both military as well as civil space ventures. This paper provides a comprehensive evaluation of five prominent solid rocket propellants: Five categories namely Ammonium Perchlorate Composite Propellant (APCP), Double-Base Propellant, Composite Modified Double Base (CMDB) Propellant, Hydroxyl-terminated polybutadiene (HTPB)-Based Propellant, and Ammonium Nitrate Composite Propellant (ANCP) have been identified. This also falls under the evaluation and includes aspects such as historical bases to see how the formulation of the propellant has changed over time regarding the development of propellant technology. In the case of each propellant, the chemical properties of the mix and reactions that its fundamental are analyzed. It also shares details regarding the changes and advancements made in the little while to enhance capability, safety, and environmental compatibility of these fuels, such as synthesizing fuels for liquid bipropellants. Some of the modern applications of technologies within the active spectrum of aerospace operations are explained in more detail to provide clients with the most versatile and essential information. Among the essentials of this work, the complex calculation of thrusts developed by the specific propellant with corresponding graphics has significant importance. These estimations afford chances of comparing the efficiency of the propellant in terms of producing thrusts as well as achieving the indicated optimal performance. Thus, the main objective of this study is to identify which of the solid rocket propellants to use in LEO missions and if any, what modifications could be made to improve them. Thus, the purpose of this paper is to contribute to the development of the constantly evolving branch of rocket propulsion by discussing the benefits and shortcomings of each propellant. These findings and recommendations could be useful in perfecting the recipes for the propellants and improving the efficiency of the subsequent missions to planets. Keywords: Aerospace, Solid rocket propellants, Thrust, Low earth orbit.

Effectiveness in protecting rigid-block-like objects through horizontal and vertical seismic isolation

In this paper, a double, horizontal and vertical base isolation, is considered for the protection of rigid-block-like objects against seismic excitation. The equations of motion, the uplift and impact conditions are obtained under the hypothesis that the block can undergo full-contact and rocking motions. It is assumed that the horizontal isolation device has a hysteretic behavior, described with the Bouc-Wen model, whereas the vertical isolation has a visco-elastic behavior, modeled through a Kelvin-Voight device. Three rigid-block-like objects, representing a caryatid, a server and hospital cabinets are considered. Moreover, as base excitation, three earthquake horizontal and vertical records are selected accounting for their spectral content and PGA. The results of the seismic analysis are arranged in rocking maps and a comparison among the systems with the horizontal and vertical isolation, with only the horizontal isolation, and with no isolation are performed to check the effectiveness of the proposed seismic protection. Results show that the coexistence of horizontal and vertical isolation in protection against seismic excitation is particularly effective under earthquakes with high vertical PGA and in objects with high slenderness and heaviness. Finally, an analysis that consists of exciting the system with horizontal and vertical one-sine, impulsive base accelerations is performed to build the overturning spectra. Also, in this case, the double, horizontal and vertical isolation has manifested better performances than the other analyzed systems.

Exploring the characteristics and thermal behavior of double base propellants based on nitrocellulose and diethylene glycol dinitrate in the presence of ternary-nanothermites containing various oxidizers

Exploring the characteristics and thermal behavior of double base propellants based on nitrocellulose and diethylene glycol dinitrate in the presence of ternary-nanothermites containing various oxidizers

Enhancing accuracy in equivalent in-service-time assessment for homogeneous solid propellants: a novel temperature-independent predictive model utilizing PCA of FTIR data

The present study was devoted to setting a universal T-independent predictive model of equivalent in-service-time (EIST) for homogenous solid propellant (HSP) to surpass the limits of the van't Hoff law particularly when high aging temperatures and/or extended aging durations are employed in artificial aging plans. To achieve this objective, four double base rocket propellants (DBRP) underwent artificial aging for 4 months at temperatures of 323.65 K, 338.65 K, 353.65 K, and 368.65 K, with sampling conducted every 20 days. Fourier Transform Infrared spectrometry (FTIR) showed that the homolytic scission of the ONO2 bonds and the hydrocarbon chains of the nitrate esters are the main processes occurring during the chemical decomposition. With the heating temperature increase, the chemical decomposition becomes more predominant. Furthermore, the scatter plot from Principal Component Analysis (PCA) of FTIR spectra obtained from each aging temperature showed, respectively, that over than 88.9 %, 94.3 %, 97.4 %, and 98.6% of the variances were described by the first principal component. This latter value was found 97.6 % when PCA was applied to all FTIR spectra. Using the PCA/FTIR approach recently developed, EIST was assessed for all the investigated samples. Subsequently, an individual predictive model of EIST was set for each heating temperature, which were used to establish the T-independent predictive model. The final model computed the EIST with a relative deviation of 5.3 % compared to those from the PCA/FTIR experimental way. Moreover, two similar DBRPs aged at different temperatures and durations have been used to validate the predictive model, and the associated mean absolute percentage error (MAPE) was found 4.6 %. The conducted comprehensive statistical analysis highlighted the excellent goodness-of-fit of the model. Furthermore, all the error metrics were found to decrease with the increase of the natural aging of the propellant and the heating temperature.

Examining the impact of nano‐sized Litharge, Tenorite, and Hematite on the thermal decomposition of ammonium perchlorate‐based cross‐linked composite modified double base propellant

AbstractThis study aims to compare the catalytic effects of three nano‐metal oxides (nMOs); Litharge (α‐PbO), Tenorite (CuO), and Hematite (α‐Fe2O3) on the thermal decomposition of an ammonium perchlorate based cross‐linked composite modified double base propellant (AP‐XLCMDBP). The three nMOs are synthesized via a chemical precipitation method and then characterized using XRD, FTIR, and SEM. Their effect on the thermal decomposition of AP‐XLCMDBP is studied using thermogravimetric analysis (TGA) and differential scanning calorimeter (DSC). The results indicate that Litharge has no significant effect on the thermal decomposition of AP‐XLCMDBP. However, both Tenorite and Hematite nanocatalysts accelerate the thermolysis process and enhance the total heat released from AP‐XLCMDBP. Moreover, compared to Tenorite, Hematite nanoparticles are found to be a more efficient catalyst, where their presence in AP‐XLCMDBP leads to a significant decrease in activation energies of the first and the second decomposition stages by 13.67 kJ/mol and 17.57 kJ/mol, respectively. An increase of the total decomposition heat by 153.73 J/g is also attained in the presence of Hematite, displaying its high catalytic action on the thermal decomposition of AP‐XLCMDBP.

Modified Arrhenius kinetics for double base propellant decomposition: Effect of water

Numerous studies have been conducted on the decomposition mechanisms of cellulose nitrate (NC), a polymer employed in double base (DB) rocket propellants. It is well known that storage temperature affects the lifetime of these energetic formulations. However, less studies have been published on the influence of water. This research examined the role of water on the stabiliser consumption rate during accelerated ageing of a DB rocket propellant, as well as the impact on the shelf life prediction of the energetic formulation. Different volumes of water (0.8, 1.6, 2 and 4 µl/g) were added to the propellant in sealed vials, which were then isothermally aged (70, 80, 90, 100 °C). Analyses of the stabiliser consumption showed a faster decomposition kinetics in presence of water which is indirectly linked to the shortening of the storage life of the NC based propellant by 35 %. For the conditions, an activation energy of 133 ± 4 kJ/mol was reported for the water catalytic decomposition mechanism. A numerical model that included water as a variable was reported to reduce the uncertainty in the determination of the service life of NC based propellant. International standards such as Allied Ordnance Publication 48 should not overlook the effect of water/moisture on the safety of ammunition containing NC and should implement a modified Arrhenius equation.

Double base mismatches mediated catalytic hairpin assembly for enzyme-free single-base mutation detection: integrating signal recognition and amplification in one.

Single nucleotide polymorphism (SNP) biosensors are emerging rapidly for their promising applications in human disease prevention diagnosis, treatment, and prognosis. However, it remains a bottleneck in equipping simple and stable biosensors with the traits of high sensitivity, non-enzyme, and low cost. Double base mismatches mediated chain displacement reactions have attracted fascinating advantages of tailorable thermodynamics stability, non-enzyme, and excellent assembly compliance to involvement in SNP identification. As the base mismatch position and amount in DNA sequence can be artificially adjusted, it provides plenty of selectivity and specificity for exploring perfect biosensors. Herein, abiosensor with double base mismatches mediated catalytic hairpin assembly (CHA) is designed via one base mismatch in the toehold domain and the other base mismatch in the stem sequence of hairpin 1 (H1) by triggering CHA reaction to achieve selective amplification of the mutation target (MT) and fluorescence resonance energy transfer (FRET) effect that is composed of Cy3 and Cy5 terminally attached H1 and hairpin 2 (H2). Depending on the rationally designed base mismatch position and toehold length, the fabricated biosensors show superior SNP detection performance, exhibiting a good linearity with high sensitivity of 6.6 fM detection limitand a broad detection abundance of 1%. The proposed biosensor can be used to detect the KRAS mutation gene in real samples and obtain good recoveries between 106 and 116.99%. Remarkably, these extendible designs of base mismatches can be used for more types of SNP detection, providing flexible adjustment based on base mismatch position and toehold length variations, especially for their thermodynamic model for DNA-strand displacement reactions.

An Investigation about Microstructures, Mechanical Properties and Corrosion Behaviour of the TIG - MIG Hybrid Welded Dissimilar UNS 2205 and is 2062 Steels

The connecting of contrasting metals, namely double stainless steel to steel made of carbon, has taken place. performed using a hybrid welding system. A TIG and MIG welding joining based hybrid joining method was designed. The microstructures of the dissimilar metal joints were studied and the grains are coarser as contrast to the use of a single the welding process process by itself. With the addition of TIG welding to the process of MIG welding, the water-holding capacity of the metal in molten state pool is significantly improved. The nominal corrosion behaviour of the weldments was found better than the single arc welding system alone. The passivation behaviour of the joints was in the similar line to that of double stainless steel base metal. The pitting resistance of the joints in 1 M NaCl solution was inferior to the base metals.

An Analysis of Double Bass Vibrato

The purpose of this study was to investigate the rates, widths, and pitches of university double bass players’ vibrato in relation to pitch height, fingers used, and tempo. Forty ( N = 40) undergraduate and graduate double bass players performed excerpts in first, fourth, and thumb positions. The overall mean vibrato rate and width was 5.17 Hz and 19 cents. Analyses indicated that university double bassists employed faster vibrato rates and increased width as they performed in progressively higher registers. The third and fourth fingers vibrated the fastest, but the second finger produced the largest width. Musical examples played with a fast tempo were both faster and wider (5.35 Hz, 20 cents) than musical examples played with a slow tempo (4.94 Hz, 19 cents). Participants vibrated almost equally above and below the in-tune pitch—overall mean pitches of vibrated and non-vibrated tones varied by 1 cent. Music educators may use these results to create more consistent descriptions of double bass vibrato and, potentially, more efficient methods for teaching vibrato.