Static Stability Research Articles

Rockburst prevention by microwave destressing: a numerical investigation

Rockbursts are a complex phenomenon characterized by a violent ejection of rock fragments from the free face of deep underground mines. Due to the sudden, disruptive, and complex nature of these events, accurate predictions of rockbursts are difficult. Therefore, geotechnical intervention is imperative to prevent the occurrence of a rockburst. The scenarios of microwave destressing is introduced here as an application method to potentially prevent their occurrence. To understand the influences of microwave destressing, such as microwave exposure duration, spatial layout, and geometric parameters of the microwave preconditioned zone (MPZ), on the occurrence of a rockburst, numerical simulation was conducted based on an impact-induced rockburst model. The feasibility of microwave destressing technology was validated numerically. This paper also provides guidance for the utilization of microwave destressing in practice. Discontinuous MPZ is suitable for a known blasting source with a fixed position, and continuous MPZ can be applied for a working condition with multiple blasting sources with variable positions. A closer distance of MPZ from the free face results in a better microwave destressing effect. However, the closer distance of MPZ from the free face also introduces more negative influences on the static stability of surrounding rock.

Numerical Study of Consolidation of Slurry Tailings Considering Continuous Update of Material Properties

Explicitly modelling tailings consolidation behaviour contributes to improve integrated management approaches and accurately estimate the storage capacity of tailings storage facilities (TSFs) to better predict their static and dynamic stability. However, slurry tailings demonstrate a highly non-linear evolution of stiffness and hydraulic conductivity during consolidation, thus significantly complexifying the determination of their hydromechanical properties. In this study, an approach to update Mohr Coulomb parameters and simulate the continuous evolution of hydraulic conductivity and stiffness of tailings materials with the reduction of the void ratio was proposed and embedded in a finite difference code to more realistically simulate the evolution of material properties during sequential loadings. The model was validated using laboratory column tests and various predictive functions were tested to estimate hydraulic conductivity for field applications. Finally, the developed approach was applied to a simplified model of tailings impoundment to illustrate practical applications. Results from this study indicated that the approach developed was able to capture the non-linearity properties of tailings during consolidation, and that using continuously updated stiffness and hydraulic conductivity could induce significantly different magnitude and rate of consolidation than models with constant properties. Predictive models such as Kozeny–Carman and Kozeny–Carman Modified models also gave a satisfactory estimation of tailings behaviour, at least for preliminary studies. The simple modifications to the numerical codes proposed in this paper could therefore significantly improve the numerical simulation of tailings behaviour in the short term and contribute to a better planning of deposition plans.

An Extended Continuation Power Flow Method for Static Voltage Stability Assessment of Renewable Power Generation-Penetrated Power Systems

The continuation power flow method (CPF) has been extensively used for obtaining the static voltage stability limit of power systems, which provides important guidance for the stable operation. However, the conventional CPF cannot account for the dynamic characteristics of renewable power generation, thus resulting in prominent errors for renewable power generation-penetrated power systems. In this paper, we investigate the static voltage stability assessment (SVSA) of power systems with high penetration of rgb0,0,0renewable power generation (RPG). An extended Jacobian matrix is firstly established by considering the dynamic characteristics of synchronous generators (SG) and renewable power generation in constant AC voltage control mode (CVRPG). Based on the extended Jacobian matrix, an extended CPF method is proposed for SVSA of the power system and a reactive power sensitivity index is proposed to indicate the voltage support capability of nodes. Simulation results show that the proposed extended CPF method has higher accuracy than conventional CPF in assessing the static voltage stability of power systems with high penetration of RPG. It is also revealed that that the voltage support capability of each node rises as the proportion coefficient is increases.

Possible existence of Bose–Einstein condensate compact stars

In this paper, we have model a compact star model composed of Bose–Einstein Condensate (BEC) matter that satisfy a polytropic equation of state (EoS) with γ=2 and a specific density profile. Then we tested the model through various physical criteria like non-singular pressure and density, energy conditions, causality condition etc. Further, we have checked the stability through Bondi criterion, hydrostatic equilibrium and static stability criterion. The stiffness of the EoS, stability, adiabatic index and Mmax depends upon a single parameter k. As k increases, the central Γ decreases near 4/3 and the compactness increases closer to 4/9 while the mass that can hold when increasing central density due to radial perturbation decreases, implies that the system will undergo gravitational collapse sooner if k increases. We have also found that this new category of compact star also follows that constraints provided by GW 170817 event. Hence, this work put forward the possibility of different category of compact star composed of BEC matters that can mimic neutron stars.

Hip Capsulolabral Complex: Anatomy, Disease, MRI Features, and Postoperative Appearance.

The hip is a uniquely constrained joint with critical static stability provided by the labrum, capsule and capsular ligaments, and ligamentum teres. The labrum is a fibrocartilaginous structure along the acetabular rim that encircles most of the femoral head. Labral tears are localized based on the clock-face method, which determines the extent of the tear while providing consistent terminology for reporting. Normal labral variants can mimic labral disease and can be differentiated by assessment of thickness or width, shape, borders, location, and associated abnormalities. The Lage and Czerny classification systems are currently the most well-known arthroscopic and imaging systems, respectively. Femoroacetabular impingement is a risk factor for development of labral tears and is classified according to bone dysmorphisms of the femur ("cam") or acetabulum ("pincer") or combinations of both (mixed). The capsule consists of longitudinal fibers reinforced by ligaments (iliofemoral, pubofemoral, ischiofemoral) and circular fibers. Capsular injuries occur secondary to hip dislocation or iatrogenically after capsulotomy. Capsular repair improves hip stability at the expense of capsular overtightening and inadvertent chondral injury. The ligamentum teres is situated between the acetabular notch and the fovea of the femoral head. Initially considered to be inconsequential, recent studies have recognized its role in hip rotational stability. Existing classification systems of ligamentum teres tears account for injury mechanism, arthroscopic findings, and treatment options. Injuries to the labrum, capsule, and ligamentum teres are implicated in symptoms of hip instability. The authors discuss the labrum, capsule, and ligamentum teres, highlighting their anatomy, pathologic conditions, MRI features, and postoperative appearance. ©RSNA, 2024 Test Your Knowledge questions for this article are available in the supplemental material.

On the relationship between mesoscale cellular convection and meteorological forcing: comparing the Southern Ocean against the North Pacific

Abstract. Marine atmospheric boundary layer (MABL) clouds cover vast areas over the ocean and have important radiative effects on the Earth's climate system. These radiative effects are known to be sensitive to the local organization, or structure, of the mesoscale cellular convection (MCC). A convolutional neural network model is used to identify the two idealized classes of MCC clouds, namely open and closed, over the Southern Ocean (SO) and Northwest Pacific (NP) from high-frequency geostationary Himawari-8 satellite observations. The results of the climatology show that MCC clouds are evenly distributed over the mid-latitude storm tracks for both hemispheres, with peaks poleward of the 40∘ latitude. Open-MCC clouds are more prevalent than closed MCC in both regions. An examination of the presumed meteorological forcing associated with open- and closed-MCC clouds is conducted to illustrate the influence of large-scale meteorological conditions. We establish the importance of the Kuroshio western boundary current in the spatial coverage of open and closed MCC across the NP, presumably through the supply of strong heat and moisture fluxes during marine cold-air outbreaks events. In regions where static stability is higher, we observe a more frequent occurrence of closed MCCs. This behavior contrasts markedly with that of open MCCs, whose formation and persistence are significantly influenced by the difference in temperature between the air and the sea surface. The occurrence frequency of closed MCC over the SO exhibits a significant diurnal cycle, while the diurnal cycle of closed MCC over the NP is less noticeable.

Characteristics of static balance performance in 4-stage balance test in the healthy older adults

Background The 4-Stage Balance test is one of the most commonly used tests to assess balance for older adults. Although it is generally accepted that the four positions (including side-by-side (SBSS), semi-tandem (STS), tandem (TS), and single-leg stance (SLS)) in this test are progressively more difficult, there are no studies comparing the balance parameters of the four positions in older adults to prove this result. The purpose of this study is to determine the difficulty of 4 positions in the 4-Stage Balance test and the effect of the dominant and non-dominant lower extremities on static balance among healthy older adults. Methods A total of 115 community-dwelling healthy older adults were included. The postural parameters (including sway range standard deviation (SR), velocity of body sway (V), total sway area (TSA) and sway perimeter (TSP) of the center of pressure) were measured during 8 static postures (including SBSS, left STS, right STS, left TS, right TS, left SLS, right SLS and comfortable stance (CS)). Repeated measures ANOVA was used to analyze the postural parameters in 8 static postures. Results The static balance stability of the five stances in older adults can be ranked in the following sequence: CS > SBSS/STS > TS > SLS. Moreover, changing foot placement in STS, TS and SLS tasks has no influence on stability. This study has been registered in China Clinical Trial Registry (ChiCTR2200065803). Conclusions Our findings suggest that it is feasible to simplify the 4-Stage Balance test to a 3-Stage Balance test in the older adults.

Chelated titanate modified multilayer graphene-butylpyridine latex/polyethylene terephthalate composites with enhanced thermal conductivity

The low thermal conductivity of polyethylene terephthalate (PET) fabric, which affects the thermal conducting between different layers in composites, is often the weakness in the application of thick butadiene-vinylpyridine latex (BVL)/PET composite, slowing down the composites' processing efficiency and dissipation of frictional heat during operation. In this study, chelated titanate modified multilayer graphene (CTMMG) was used to functionalize butadiene-vinylpyridine latex (CTMMG-BVL), which was further applied for preparing composite to improve the thermal conductivity of PET-reinforced composite (CTMMG-BVL/PET). The static and dynamic stabilities of the CTMMG dispersion as well as thermal conductivity and electrostatic properties of the CTMMG-BVL film and CTMMG-BVL/PET composite were investigated. It was found that both static and dynamic stabilities of the CTMMG dispersion within 24 h were superior to unmodified multilayer graphene (MG) as the MG content and mass ratio of titanate to MG were 10 mg/mL and 25 %, respectively. Compared to the BVL film, the thermal conductivity and tensile strength of CTMMG-BVL film (CTMMG content: 2.19 wt%) were increased by 28.8 % and 4.5 %, respectively. The thermal conductivity of the CTMMG-BVL/PET composite was further enhanced by 48.3 % (from 2.65 to 3.93 W/(m·K)) compared to that of BVL/PET. The electrostatic property of the CTMMG-BVL film and CTMMG-BVL/PET composite was significantly improved. Fourier transform infrared (FTIR) analysis indicated that the mechanism for the excellent static and dynamic stability of waterborne CTMMG dispersions was attributed to the synergistic effects of the hydrogen bond and chemical bond formed between titanate and MG. The prepared CTMMG-BVL/PET composite with excellent thermal conductivity and heat dissipation showed potential application in many fields such as aviation, transportation, and seals.

A viscoplastic constitutive model for plastic silts and clays for static slope stability applications

A viscoplastic model for representing plastic silts and clays in geotechnical static slope stability applications is presented. The PM4SiltR model builds on the stress ratio-controlled, critical state-based, bounding surface plasticity model PM4Silt and is coded as a dynamic link library for use in the finite difference program FLAC 8.1. PM4SiltR incorporates strain rate-dependent shear strength, stress relaxation, and creep using a consistency approach combined with an internal strain rate and auto-decay process. The model does not include a cap, and as such cannot simulate strain rate-dependent consolidation under increasing overburden stress. Six parameters control the viscous response for PM4SiltR while the parameters controlling the nonviscous components of the response are the same as for PM4Silt. Single element simulations are presented to illustrate the influence of viscoplasticity on the constitutive response in direct simple shear loading and undrained creep. Single element responses are shown to be consistent with observed experimental results. Simulations of a hypothetical tailings dam constructed using the upstream method are performed to illustrate use of PM4SiltR at field scale. Results of field scale simulations show PM4SiltR can model undrained creep and progressive failure leading to delayed slope instability after relatively minor changes in loading conditions at field scale.

Impact of poor prognostic risk for chronic low back pain on functionality and lumbopelvic stability: a cross-sectional observational study

Internal load to deal with physical exercise demand depends on the psychophysical capacity. As psychosocial aspects affect patients suffering chronic low back pain (CLBP), we hypothesized that the higher the risk of poor prognosis, the lower the psychophysical capacity and, consequently, the worse the performance in functional tasks that involve walking. To verify the impact of the risk of poor prognosis of patients with CLBP on functional performance and physiological intensity (PI), representative of the task internal load, in a walking test and on lumbopelvic region static and dynamic stability. Cross-sectional observational study. Volunteers of both sexes, physically inactive, were divided into four groups according to the Start Back Screening Tool: control (CG) CLBP free, and low (LrG), medium (MrG), high (HrG) poor prognostic risk. The outcomes were static stability, with emphasis on the action of the transverse and multifidus muscles, and dynamic stability of the lumbopelvic region, both measured by a biofeedback pressure unit, as well as functional capacity, and physiological intensity in the 6-minute walk test. The GEE and complementary metrics (minimum detectable change and effect size) were used for statistical analysis. The sample consisted of 70 volunteers. The outcomes were proportionally affected by the risk of poor prognosis (the higher the risk, the worst performance) and the complementary metrics corroborated inferential statistics. The risk of poor prognosis negatively and proportionally impacts both the static and dynamic lumbopelvic stabilization capacity and the performance and the PI in walking of individuals with CLBP.

Trends and oscillations in arctic mediterranean atmospheric static stability during recent arctic warming

The long-term variation in the static stability of lower atmosphere (SSLA) in the Arctic Mediterranean is investigated using reanalysis data. Climatological SSLA is categorized into a high-value region (Polar Region) and two low-value regions in the Norwegian Sea (Region-A) and southern part of Iceland (Region-B). The variations of SSLA are divided into trends and oscillations. In the Polar Region, SSLA exhibited a decreasing trend due to Arctic warming and sea ice decline, with negligible oscillatory variations. In Region-A and Region-B, the trends of SSLA are insignificant, while the oscillatory variation becomes obvious. SSLA there are highly correlated to Arctic Oscillation (AO) Index and vertical velocity. The driving factors in weakening SSLA are vertical velocity and surface heating, related to enhanced warm water advection dominated by AO. The variation of SSLA in turn feeds back the vertical velocity and AO.

Study on the static stability of aluminum alloy single-layer spherical reticulated shell

In order to study the static stability of an aluminum alloy single-layer spherical reticulated shell, a static loading test of a K6 reticulated shell with 3 rings, a 4 m span, and a 1/7 height-to-span ratio is carried out. The deformation, internal force distribution, and failure mode of the reticulated shell model are discussed. By comparing the monotone tensile test and simulation of the single member, the simulation method of rivet used in the finite element model (FEM) is obtained, and the bending stiffness and axial slip stiffness of gusset joints are calculated. Considering the joint stiffness in the FEM, the simulation results and the test fit well, indicating that the influence of the joint stiffness on the static stability of the reticulated shell cannot be ignored. In addition, by comparing the effect of different parameters of joint stiffness, the axial slip stiffness should be considered in the stability design of reticulated shells.

Wind Resistance Performance Assessment of Long-Span Cable-Supported Bridges Based on Time-Varying Reliability Theory

Long-span cable-supported bridges constitute the most common type of bridge with a span of more than 400 m. They are generally designed as a double-tower long-span structure with good spanning capacity and economic performance. Wind resistance safety performance is the main index used to control the long-span cable-supported bridge structure. During the life of a long-span cable-supported bridge structure, because the service life of the cables is far shorter than the design life of the structure, the wind resistance performance of the structure will inevitably deteriorate significantly, which will seriously affect the structural service performance of symmetric cable-supported bridges. Under strong wind loads, the static wind stability and flutter stability of cable-stayed bridge structures are components of the limit state of bearing capacity, which directly affects the safety performance of the structure. We take the flutter and static wind stability of a long-span cable-supported bridge structure as the main design control index, use inverse reliability theory to calculate the reliability index of a symmetric cable-supported bridge structure, use inverse reliability theory to calculate the safety factor of a symmetric cable-supported bridge structure, and evaluate the time-varying wind resistance performance of a long-span cable-supported bridge structure by comprehensively considering the reliability index and safety factor. Taking a practical project concerning a long-span cable-supported bridge as a specific case, the time-varying wind resistance reliability of the bridge throughout its operation for more than 30 years is analyzed along with the parameter sensitivity. The results show that the wind resistance performance of the cable-supported bridge structure is obviously affected by its cables, and the degradation of cable performance will have a significant impact on the time-varying wind resistance performance of the structure, especially the critical wind speed of the structure, which has obvious time-varying characteristics. The safety factor and reliability index can be used to objectively evaluate the time-varying wind resistance performance of long-span cable-supported bridge structures.

Understanding the role of TiO2 coating for stabilizing 4.6V high-voltage LiCoO2 cathode materials

TiO2 surface coating is considered to be an effective strategy for improving the cycling performance of commercially available high voltage LiCoO2 (HV-LCO) batteries. However, the mechanism underlying the TiO2 coating remains ambiguous due to the synergy of solid-state coating and annealing processes. In this work, the effects of TiO2 were systematically studied for 4.6 V HV-LCO batteries. The results showed that the coated TiO2 can be transformed into LiTiO2-rich layer, which can reduce surface residual lithium (SRL), lower the formation of Co3O4 and LiF-rich cathode electrolyte interphase (CEI) layer. Moreover, the annealed sample delivered improved surface texture, reduced specific surface area, and lower SRL, which was beneficial to improve the rate capability and cyclic performance. However, the LCO after annealing and coating exhibited weak static oxygen stability at high voltage due to the change in bulk Li/Co stoichiometry, leading to higher gas production. This work provides new insights into the effects of metal oxide coating and sheds light on the commercial process for HV-LCO.

Accessing the Hip Capsular Management: Outside-In and Inside-Out Including Periportal, Intraportal, T-Capsulotomy

The hip joint is a ball and socket joint supported by static and dynamic stabilizers. The hip capsule and its constituent ligaments provide support during weight-bearing activities. Hip arthroscopy requires capsulotomy for visualization and instrumentation and a thorough understanding of the anatomy and biomechanics of the hip capsule allows surgeons to select the appropriate capsulotomy technique for each procedure. This chapter described capsular access techniques including periportal, interportal, and T-capsulotomy, as well as puncture and extracapsular access techniques. Capsular closure techniques are reviewed and outcomes after varying capsular management techniques are summarized.

Highly efficient and eco‐friendly enhancement of polyvinyl chloride thermal stability: A renewable cinnamate‐intercalated calcium aluminum hydrotalcite stabilizer

AbstractWith the development of green chemistry, PVC thermal stabilizers should be developed in the direction of non‐toxic, environmental protection, and high efficiency. This study utilized natural Cinnamic acid to successfully synthesize an eco‐friendly and high‐performance cinnamate‐intercalated calcium aluminum hydrotalcite through the coprecipitation method. The structure of CaAl‐cinnamate‐LDHs was analyzed via XRD, IR, SEM, and thermogravimetric analyses. The CaAl‐cinnamate‐LDHs/PVC sample was thoroughly investigated using multiple techniques, including tests, such as oven aging, thermogravimetric analysis, Congo red analysis, and conductivity analysis. Compared with the commercial thermal stabilizers CaSt2/ZnSt2 and CaAl‐CO3‐LDHs, CaAl‐cinnamate‐LDHs demonstrated superior initial whiteness and exceptional long‐term thermal stability, it did not completely blacken until 120 min. Dynamic mechanical analysis showed that the addition of CaAl‐cinnamate‐LDHs could improve the plasticizing performance of PVC. CaAl‐cinnamate‐LDHs also had a synergistic effect with ZnSt2, with a static thermal stabilization time of up to 40.5 min. Through HCl absorption experiments to investigate the thermal stabilization mechanism, the results showed that CaAl‐cinnamate‐LDHs can effectively absorb HCl released during PVC degradation.Highlights By utilizing natural organic Cinnamic acid, Calcium nitrate, and Aluminum nitrate as raw materials, all from a wide range of sources, the reaction process eliminated the need for toxic solvents and a large number of chemicals. The preparation process of CaAl‐cinnamate‐LDHs was simple and the reaction time was short. Comprehensive tests showcased the exceptional long‐term thermal stability of the CaAl‐cinnamate‐LDHs/PVC sample. The addition of CaAl‐cinnamate‐LDHs can improve the plasticizing property of PVC. The mechanism of CaAl‐cinnamate‐LDHs was capable of absorbing HCl released during PVC degradation.

Optimal Location and Size of SVC and TCSC for Multi-objective Static Voltage Stability Enhancement

A Non-dominated Sorting Particle Swarm Optimization (NSPSO) is used to solve a mixed continuousdiscreet Multi-objective optimization problem witch consist of optimal location and size of Static Var Compensators (SVC) and Thyristor Controlled Series Capacitors (TCSC) in order to maximize Static Voltage Stability Margin (SVSM), reduce power losses (PL) and minimize load Voltage Deviations (VD). While finding the optimal location, thermal limits for the lines and voltage limits for the buses are taken as security constraints. The optimization is performed considering two and three objectives for various combinations of FACTS. Simulations are performed on IEEE 14 test system for optimal location and size of FACTS devices. The obtained results are very encouraging and reveal the capability of the method to generate well-distributed non-dominated Pareto front.

A specific stratospheric precursory signal of overshooting convective systems over the southern slope of the Tibetan Plateau

Using the TRMM PR observations, ERA5 reanalysis and Outgoing Longwave Radiation (OLR) datasets, a specific stratospheric precursory signal to the occurrence of overshooting convective systems (OCSs) over the southern slope of the Tibetan Plateau (SSTP) is investigated. We compared two types of OCS events: OCSs associated with stratospheric intrusions and other OCSs. The results indicate that there is a notable decline in the tropopause height starting two days before to on the day of the OCS onset for OCSs associated with stratospheric intrusions, but the tropopause height for other OCSs increases with the occurrence of OCS. It is found that the descending of the tropopause height is accompanied by downward intrusion of stratospheric high potential vorticity (PV) air into the troposphere for the OCSs associated with stratospheric intrusions. The increase in PV near the tropopause can cause an increase in temperature and relative vorticity near the tropopause. The OCSs associated with stratospheric intrusions are closely related to strong synoptic variability. As the stratospheric intrusion deepens on the day of the OCS onset, increased relative vorticity near the tropopause, stronger upward motion in the troposphere associated with divergence and convergence, more specific humidity in the troposphere, and weakened static stability in the middle troposphere are found within the OCS region, which are conducive to the development of deep convection that penetrates into the stratospheric intrusion. Compared with OCSs associated with stratospheric intrusions, other OCS events are characterized by stronger high cloud cover (HCC) and negative Outgoing Longwave Radiation (OLR) anomaly, as well as higher upward movement in the troposphere. This is conducive to other OCSs occurring in a more barotropic convective environment characteristic of the Asian monsoon, the vertical development height of weakened static stability and upward motion are higher, promoting the development of convective activity to higher altitudes and penetrating into the tropopause, thereby causing the uplift of the tropopause.

Ecomorphology of the Locomotor Apparatus in the Genus Cyrtodactylus (Gekkota, Squamata)

Adaptive radiations garner considerable interest from evolutionary biologists. Lizard radiations diversifying along structural niche space often exhibit distinct changes in body and limb proportions. One prediction is that terrestrial species inhabiting open habitats will have relatively longer hindlimbs, associated with faster running speeds, while scansorial species will have relatively shorter limbs to keep the centre of mass closer to the substratum. Alternatively, terrestrial species in densely vegetated habitats could benefit from relatively shorter limbs to prevent entanglement with more frequently encountered obstacles, whereas scansorial species could benefit from longer limbs promoting greater limb spans and static stability. Cyrtodactylus, an ecologically diverse gekkonid genus, includes numerous specialists with narrow structural niches, but the degree of morphological diversification exhibited by these specialists is largely unknown. We investigated associations between locomotor morphology and structural microhabitat use in Cyrtodactylus to test if either of the opposing predictions can be corroborated for this radiation. We measured body length and relative limb dimensions of 87 species, covering multiple independent transitions among structural microhabitat preferences. Using these data, we reconstructed the phylomorphospace and tested for associations between structural microhabitat niche and limb morphology. We found strong separation between structural niche groups in accordance with the second hypothesis, although overlap is evident among functionally related niches such as those of granite and karst specialists.

Effect of Inert Species on the Static and Dynamic Stability of a Piloted, Swirl-Stabilized Flame

Abstract Carbon sequestration and utilization has been proposed as a method for decarbonizing high-efficiency industrial gas turbines operating on natural gas fuels for power generation and industrial markets. To increase the efficiency of the carbon removal process from the exhaust stream of the turbine, exhaust gas recirculation (EGR) can be used. EGR recycles a portion of the engine exhaust into the inlet, increasing the concentration of inert species in the exhaust stream to improve the performance and cost-effectiveness of CO2 separation systems. This strategy can, however, reduce the oxygen concentration in the air, leading to changes in flame stabilization in the combustor. In this study, we investigate the effect of air diluted with inert gases of different compositions and the impact that these mixtures have on flame static and dynamic stability. A swirl-stabilized flame in a single-nozzle, variable-length combustor is used to measure the flame behavior for oxygen concentrations of 15–21% by volume. A constant adiabatic flame temperature test matrix is conducted to mimic operation in an industrial gas turbine. High-speed chemiluminescence imaging is used to determine the change in flame shape and dynamics for each gas composition. As the oxygen concentration decreases, the flame lifts from the centerbody, resulting in an aerodynamically stabilized flame at the lowest O2 concentrations. Different compositions of gases result in different flame shapes, where higher levels of N2 in the diluents result in more flame stabilization in the outer recirculation zone as compared to those with higher levels of CO2. The flame oscillation mechanisms also change with oxygen concentration, where the lifted flames at low O2 levels exhibit an ignition/extinction oscillation mode as compared to a vortex-shedding-coupled oscillation mode at high O2 levels where the flame is stabilized on the centerbody. Companion chemical kinetics simulations are used to explain changes in the flame's shape and behavior.