Segregation Rate Research Articles

Study on Storage Stability of Activated Reclaimed Rubber Powder Modified Asphalt.

The purpose of this research was to make full use of waste lubricating by-products (LBP) and reclaimed rubber powder (RR) to modify asphalt by a one-pot approach, so as to achieve the dual purpose of solving the poor storage stability of reclaimed rubber powder modified asphalt (RRMA) and the realization of solid waste recycling. A variety of characterization techniques were performed to analyze storage stability, conventional properties and microstructure of LBP-activated reclaimed rubber powder modified asphalt (Blend). Fourier transform infrared spectroscopy illustrated that not only the chemical composition of LBP was very similar to that of asphalt, but also the activation of LBP improved the compatibility of RR with asphalt and enhanced the storage stability of Blend. Fluorescence spectrum and scanning electron microscopy results indicated that the RR without LBP activation was aggregated and dispersed as blocks in asphalt, while the LBP activated RR was uniformly dispersed in the asphalt phase. The segregation test demonstrated that Blend exhibited outstanding storage stability, in which the softening point difference was within 2.5 °C and the segregation rate was −0.2–0.2. In addition, the conventional properties of Blend have been significantly improved, especially in penetration and ductility. More importantly, the short-term aging results demonstrated that, compared with RRMA, Blend possessed excellent anti-aging performance.

Critical Repetition Rates for Perceptual Segregation of Time-Varying Auditory, Visual and Vibrotactile Stimulation

Abstract What sound quality has led to exclude infrasound from sound in the conventional hearing range? We examined whether temporal segregation of pressure pulses is a distinctive property and evaluated this perceptual limit via an adaptive psychophysical procedure for pure tones and carriers of different envelopes. Further, to examine across-domain similarity and individual covariation of this limit, here called the critical segregation rate (CSR), it was also measured for various periodic visual and vibrotactile stimuli. Results showed that sequential auditory or vibrotactile stimuli separated by at least ~80‒90 ms (~11‒12-Hz repetition rates), will be perceived as perceptually segregated from one another. While this limit did not statistically differ between these two modalities, it was significantly lower than the ~150 ms necessary to perceptually segregate successive visual stimuli. For the three sensory modalities, stimulus periodicity was the main factor determining the CSR, which apparently reflects neural recovery times of the different sensory systems. Among all experimental conditions, significant within- and across-modality individual CSR correlations were observed, despite the visual CSR (mean: 6.8 Hz) being significantly lower than that of both other modalities. The auditory CSR was found to be significantly lower than the frequency above which sinusoids start to elicit a tonal quality (19 Hz; recently published for the same subjects). Returning to our initial question, the latter suggests that the cessation of tonal quality — not the segregation of pressure fluctuations — is the perceptual quality that has led to exclude infrasound (sound with frequencies < 20 Hz) from the conventional hearing range.

P-525 Analysis of segregation patterns of trivalent structure and the effect on genome stability in Robertsonian translocation carriers

Abstract Study question What are the factors that affect the separation pattern of Robertsonian translocation trivalent, and whether the structure of the trivalent affected the chromosome stability? Summary answer The meiotic segregation modes can be affected by the carrier’s sex and special chromosome, and a trivalent structure can affect the stability of the genome. What is known already Robertson translocation occurs when two proximal acrocentric chromosomes fuse at the centromere, and forms a trivalent structure during meiosis. This structure will affect the fertility of Robertsonian translocation carriers, and may destroy the stability of the genome by affecting the separation of other chromosomes, which is called Inter-Chromosomal Effect (ICE). Previous research have confirmed that the use of PGT in Robertsonian translocation carriers can effectively reduce abortion and increase live birth. But some studies dispute this conclusion and the existence of ICE. However, there is no large data study to verify these controversies. Study design, size, duration PGT results of 928 oocyte retrieval cycles in 763 couples(one of the couples is a Robertsonian translocation carrier) were analysied from December 2012 to June 2020. A total of 1492 couples who received PGT-A were collected as control group, and matched according to age and testing time stage. The study was approved by the ethics committee(LL-SC-SG-2006-008 and LL-SC-SG-2014-016). Participants/materials, setting, methods Cytogenetic analysis was performed using GTG standard method (trypsin and GiemsaG banding) to analyze the chromosomes of peripheral blood lymphocytes. Blastocysts obtained by standard IVF procedure were biopsied on the 5th or 6th morning after fertilization, and the trophoblast cells were amplified by PicoPLEX whole genome amplification kit (Rubicon Genology) or Repli-g Single Cell Kit(Qiagen). PGT-SR was performed using SNP array or NGS as previously described. Main results and the role of chance In this study, a total of 3423 blastocysts from 763 couples were analysed using SNP-array or NGS. Among them, the rate of alternate segregation of male Robertsonian translocation carriers was significantly higher than that in female carriers (82.26% vs 59.96%, P < 0.001), and meiotic segregation modes could be affected by the special chromosome such as 13 in female(P = 0.042) and 15 in male(P = 0.045) involved. A trivalent structure can affect the stability of the genome during mitosis, which is associated with an increase in the propotion of chromosome mosaic compared with the PGT-A control group(1.18% vs 0.53%, P < 0.01). In addition, we found an interesting phenomenon: in the meiotic segregation of female Robertsonian translocation carriers associated with chromosomes 21 and 22, the chromosome 21 or 22 of the two chromosomes involved in translocation are more likely to be abnormal, and according to our results, the effect of chromosome 21 seems to be greater. Limitations, reasons for caution (1) Limitations of retrospective analysis; (2) The results are not fully representative of the general population; (3) PGT-A patients always had repeated implantation failure or recurrent aboration, which may cause deviation to the results. Wider implications of the findings This study analyzed the influencing factors of the separation patterns of trivalent, and verified the existence of ICE. This suggest that PGT-SR can have a better outcome in patients with Robertsonian translocation, especially in male carriers. These results will provide carrier couple with more appropriate genetic counseling. Trial registration number no

P–525 Analysis of segregation patterns of trivalent structure and the effect on genome stability in Robertsonian translocation carriers

Abstract Study question What are the factors that affect the separation pattern of Robertsonian translocation trivalent, and whether the structure of the trivalent affected the chromosome stability? Summary answer The meiotic segregation modes can be affected by the carrier’s sex and special chromosome, and a trivalent structure can affect the stability of the genome. What is known already Robertson translocation occurs when two proximal acrocentric chromosomes fuse at the centromere, and forms a trivalent structure during meiosis. This structure will affect the fertility of Robertsonian translocation carriers, and may destroy the stability of the genome by affecting the separation of other chromosomes, which is called Inter-Chromosomal Effect (ICE). Previous research have confirmed that the use of PGT in Robertsonian translocation carriers can effectively reduce abortion and increase live birth. But some studies dispute this conclusion and the existence of ICE. However, there is no large data study to verify these controversies. Study design, size, duration PGT results of 928 oocyte retrieval cycles in 763 couples(one of the couples is a Robertsonian translocation carrier) were analysied from December 2012 to June 2020. A total of 1492 couples who received PGT-A were collected as control group, and matched according to age and testing time stage. The study was approved by the ethics committee(LL-SC-SG–2006–008 and LL-SC-SG–2014–016). Participants/materials, setting, methods Cytogenetic analysis was performed using GTG standard method (trypsin and GiemsaG banding) to analyze the chromosomes of peripheral blood lymphocytes. Blastocysts obtained by standard IVF procedure were biopsied on the 5th or 6th morning after fertilization, and the trophoblast cells were amplified by PicoPLEX whole genome amplification kit (Rubicon Genology) or Repli-g Single Cell Kit(Qiagen). PGT-SR was performed using SNP array or NGS as previously described. Main results and the role of chance In this study, a total of 3423 blastocysts from 763 couples were analysed using SNP-array or NGS. Among them, the rate of alternate segregation of male Robertsonian translocation carriers was significantly higher than that in female carriers (82.26% vs 59.96%, P < 0.001), and meiotic segregation modes could be affected by the special chromosome such as 13 in female(P = 0.042) and 15 in male(P = 0.045) involved. A trivalent structure can affect the stability of the genome during mitosis, which is associated with an increase in the propotion of chromosome mosaic compared with the PGT-A control group(1.18% vs 0.53%, P < 0.01). In addition, we found an interesting phenomenon: in the meiotic segregation of female Robertsonian translocation carriers associated with chromosomes 21 and 22, the chromosome 21 or 22 of the two chromosomes involved in translocation are more likely to be abnormal, and according to our results, the effect of chromosome 21 seems to be greater. Limitations, reasons for caution (1) Limitations of retrospective analysis; (2) The results are not fully representative of the general population; (3) PGT-A patients always had repeated implantation failure or recurrent aboration, which may cause deviation to the results. Wider implications of the findings: This study analyzed the influencing factors of the separation patterns of trivalent, and verified the existence of ICE. This suggest that PGT-SR can have a better outcome in patients with Robertsonian translocation, especially in male carriers. These results will provide carrier couple with more appropriate genetic counseling. Trial registration number no

Viscous Effects on the Particle Size Segregation in Geophysical Mass Flows: Insights From Immersed Granular Shear Flow Simulations

AbstractSize segregation is a common feature in geophysical mass flow deposits and is an active process during motion. The presence of interstitial fluids in such flows affect the motion of constituent particles and result in complex segregation behaviors. Effects of the viscosity and density of various interstitial fluids on the rate of particle size segregation are investigated through coupled granular‐fluid simulations of immersed plane‐sheared flows. The segregation rate decreases as the fluid viscosity increases, but remains constant when the viscosity is below certain threshold values. In the low viscosity limit, segregation is affected only by the relative density between the particles and the fluid, and by flow inertial conditions. Analysis of segregation forcing terms based on the mixture theory of segregation reveals that the decrease of segregation rates with the viscosity is due to the increase of fluid drag forces, which effectively weaken the contact stress gradients responsible for driving the large particles to migrate upward. Viscous damping also diminishes velocity fluctuations and thereby inhibits the migration of particles throughout the mixture. The transition in the viscosity dependence is shown to correspond to the transition between granular‐fluid flow regimes. An empirical scaling formula is developed which accounts for the effects of fluid viscosity and the relative density on size segregation immersed in different fluids.

Research on Optimal Proportion and Performance of Cement-Clay Slurry

For the cement-clay slurry commonly used in dynamic water grouting, consider adding coal ash to optimize the performance of cement-clay slag composite slurry and discuss the reaction mechanism of the slurry through microchemical element analysis; the orthogonal test was used to study the influence of various factors on material setting time, solidification ratio, water segregation rate, and the optimized ratio of the slurry that was obtained by integrating the unconfined compressive strength of grouting concretion body and slurry configuration cost. The results showed that the water-solid ratio had the greatest influence on the comprehensive performance, followed by the amount of coal ash admixture. The best performance of the composite slurry was obtained with a water-solid ratio of 0.8:1 and a cement:coal ash:clay:quicklime:sodium sulfate:water mass ratio of 1:0.45:0.20:0.05:0.07:1.32. Finally, by comparing the mechanical properties of the optimized slurry and the grouting concretion body, it is proved that the optimized slurry has superior performance to meet the general grouting project requirement.

Iodide Expulsion at Photoirradiated Mixed Halide Perovskite Interface

Visible light irradiation of a mixed halide perovskite (with bromide and iodide in the X-site) in contact with a solvent like dichloromethane (DCM) leads to selective expulsion of iodide from the film. This causes a concurrent blue-shift in band edge. We find that addition of Cs to A-site reduces the mobility of iodide ions under photoirradiation. In the absence of a solvent, these mixed halide perovskites undergo phase segregation, the rate of which decreases with the addition of Cs. Interestingly, the iodide expulsion rate in DCM is strongly dependent on the rate of photoinduced segregation. At Cs atomic concentrations greater than 50%, the films become stable as the iodide expulsion is largely suppressed. The role of the A-site cation in dictating the mobility of halide ions will be discussed in the talk.

Experimental investigations for the effect of fine powders on size-induced segregation in binary granular mixtures

This paper presents experimental investigations on the size-induced segregation behavior of binary granular mixtures in a rotating drum by adding a small amount of fine powders. Four different fine powder contents were selected, and three different rotation speeds were adopted. Experimental results reveal that the flowability of granular mixtures can be enhanced by a lubrication effect induced by a proper amount of fine powders. The segregation index and rate increase with the increasing fine powder content and rotation speed. The local-ensemble average velocity and granular temperature for large main particles also increase with the increase of fine powder content and rotation speed. The increase of fine powder content provides stronger lubrication effects, and the increase of rotation speed offers more energy into the granular mixtures. The dynamic properties proposed herein can characterize the size-induced granular segregation behavior. The increasing fine powder content and rotation speed facilitate size-induced granular segregation.

Selection strategy of a Coffea canephora rootstock with simultaneous nematode resistance to Meloidogyne exigua, M. incognita and M. paranaensis

The cultivars of most Brazilian Arabica coffee plantations are susceptible to root knot nematodes (RKN), Meloidogyne spp. By planting resistant rootstocks of the species Coffea canephora, a successful strategy in some producing regions, coffee can be cultivated in RKN-infested areas. However, the only currently available rootstock cultivar in Brazil has a segregation rate close to 20% for susceptibility. To breed new rootstock cultivars resistant to the main RKN species, with a lower segregation rate, 10 C. canephora clones were selected in areas infested by these nematodes, with confirmed resistance to Meloidogyne exigua, M. incognita and M. paranaensis, under controlled conditions. The genetic compatibility analysis of the clones detected only one incompatible combination (CcK1xCcR5 and its reciprocal). Almost all F1 hybrids resulting from the cross between the selected clones were resistant to M. exigua and M. incognita. According to the reproduction factor, 77% of the evaluated F1 hybrids proved resistant to M. paranaensis, and those classified as susceptible had variable segregation rates within the progeny, generally lower than 25%. Based on these data, different hybrid combinations can be suggested for the development of new rootstock cultivars of C. canephora with simultaneous resistance to coffee RKN. This approach has immediate practical applications in grafting Arabica coffee scion cultivars in areas where nematodes restrict cultivation.

Better for everyone: Black descriptive representation and police traffic stops

ABSTRACT Racial disparities in citizen interactions with police are ubiquitous concerns in American communities. What difference does electoral representation make? We demonstrate that black descriptive representation in local government affects police activity and scrutiny in a given community. We use a new dataset comprised of over 79 municipal police departments spanning 6 states, based on tens of millions of individual-level traffic stops. In cities and towns with majority-black city councils, traffic stops are less likely to result in a search. This decline in search rates affects both white and black drivers, though the decline is larger for black drivers. Even after controlling for socioeconomic factors, segregation, and crime rates, descriptive representation still matters. A city council composed of a majority of black members is associated with important differences in policing, affecting both white and black residents.

G-C3N4 nanosheets adhered with Ag3BiO3 and carbon dots with appreciably promoted photoactivity towards elimination of several contaminants

Herein, graphitic carbon nitride nanosheets (signified as CN-NS) were anchored with Ag3BiO3 and carbon dots (abbreviated as CDs) by hydrothermal procedure with appreciably promoted photoactivity towards elimination of several contaminants. The CN-NS/CDs/Ag3BiO3 (30%) system, as optimal photocatalyst, demonstrated extremely high elimination efficiency for several pollutants such as methylene blue (MB), malachite green (MG), Rhodamine B (RhB), and methyl orange (MO) under visible light, which is 55.5, 36.5, 39.2, and 32.1 folds premier than CN material, respectively. Besides, PL, EIS, and transient photocurrent response data corroborated that the CN-NS/CDs/Ag3BiO3 (30%) material has the highest charge carriers segregation efficiency compared with the pure and binary systems. Energy band structure analysis demonstrated that the improved performance of CN-NS/CDs/Ag3BiO3 photocatalyst is allocated to Z-scheme heterojunction. Scavenging tests demonstrated that h+, •OH, and •O2− are the crucial species in the RhB degradation. Enhancement of elimination ability can be allocated to more generation of the charge carries and improvement of the segregation rate of them promoted through the Z-scheme mechanism.

Effect of Concentration and Suspension Agent (HPMC) on Properties of Coal Gangue and Fly Ash Cemented Filling Material

Cemented coal gangue-fly ash backfill (CGFB) mixtures are utilized as the filling materials for backfilling the underground openings in coal mines. The freshly prepared CGFB slurries are commonly transported into the gobs through a pipeline. The mixture ratio of slurry concentration and suspending agent (HPMC) plays an essential role in transporting the slurry to goaf smoothly and efficiently. In this paper, the influence of slurry concentration and HPMC on the performance of coal gangue-fly ash cemented filling material was studied based on the response surface method. The prediction model of CGFB slurry slump flow, segregation rate, and bleeding rate was constructed. It is concluded that the segregation rate and slump flow of slurry are more sensitive to the variation of concentration. On the other hand, the bleeding rate of slurry is more sensitive to the change of HPMC content. Based on the established model, the reasonable mix proportion range of slurry concentration and suspending agent (HPMC) was obtained. In addition, three new CGFB mixtures have been tested, and the experimental results are in good agreement with the predicted values.

Stability Evaluation and Mechanism of Asphalts Modified With Various Rubber Powder Contents

Ground tires are one of the main sources of urban solid waste. Rubber powder-modified asphalt provides an effective method to solve the problem, and it presents good high- and low-temperature performance in sustainable pavement construction. However, the storage properties of rubber powder-modified asphalts prepared from the traditional low-temperature shear mixing method are unstable, which restricts their application. In this study, four test methods (the softening-point test; the dynamic shear rheological test; the Laboratory Asphalt Stability Test; and fluorescence image analysis) and six evaluation indexes (the softening-point difference Sdiff, the segregation percentage Sp, the segregation index Ise, the segregation rate Rs, the degradation rate Rd, and the stability index Ist) were employed to analyze the storage abilities of asphalts modified by various activated rubber powder contents. The results show that the storage properties have a positive correlation with rubber powder content in the modified asphalt, and a rubber powder content of 60% is proven to be the optimum mixing amount. The rubber powders can distribute uniformly in the asphalt matrix when mixed below the optimum mixing amount; otherwise a rubber powder agglomeration is formed. The quantitative morphology analysis results are in good agreement with the laboratory test conclusions. The activated rubber powder shows better compatibility compared with ordinary rubber powders and presents a promising method to treat waste ground tires.

Chromosomal Polymorphism and Speciation: The Case of the Genus Mazama (Cetartiodactyla; Cervidae).

Chromosomal polymorphism plays a major role in speciation processes in mammals with high rates of karyotypic evolution, as observed in the family Cervidae. One remarkable example is the genus Mazama that comprises wide inter- and intra-specific chromosomal variability. To evaluate the impact of chromosomal polymorphisms as reproductive barriers within the genus Mazama, inter-specific hybrids between Mazama gouazoubira and Mazama nemorivaga (MGO × MNE) and intra-specific hybrids between cytotypes of Mazama americana (MAM) differing by a tandem (TF) or centric fusion (Robertsonian translocations—RT) were evaluated. MGO × MNE hybrid fertility was evaluated by the seminal quality and testicular histology. MAM hybrids estimation of the meiotic segregation products was performed by sperm-FISH analysis. MGO × MNE hybrids analyses showed different degrees of fertility reduction, from severe subfertility to complete sterility. Regarding MAM, RT, and TF carriers showed a mean value for alternate segregation rate of 97.74%, and 67.23%, and adjacent segregation rate of 1.80%, and 29.07%, respectively. Our results suggested an efficient post-zygotic barrier represented by severe fertility reduction for MGO × MNE and MAM with heterozygous TF. Nevertheless, RT did not show a severe effect on the reproductive fitness in MAM. Our data support the validity of MGO and MNE as different species and reveals cryptic species within MAM.

Atomistic Mechanisms of Binary Alloy Surface Segregation From Nanoseconds to Seconds Using Accelerated Dynamics

Although the equilibrium composition of many alloy surfaces is well understood, the rate of transient surface segregation during annealing is not known, despite its crucial effect on alloy corrosion and catalytic reactions occurring on overlapping timescales. In this work, CuNi bimetallic alloys representing (100) surface facets are annealed in vacuum using atomistic simulations to observe the effect of vacancy diffusion on surface separation. We employ multi-timescale methods to sample the early transient, intermediate, and equilibrium states of slab surfaces during the separation process, including standard MD as well as three methods to perform atomistic, long-time dynamics: parallel trajectory splicing (ParSplice), adaptive kinetic Monte Carlo (AKMC), and kinetic Monte Carlo (KMC). From nanosecond (ns) to second timescales, our multiscale computational methodology can observe rare stochastic events not typically seen with standard MD, closing the gap between computational and experimental timescales for surface segregation. Rapid diffusion of a vacancy to the slab is resolved by all four methods in tens of ns. Stochastic re-entry of vacancies into the subsurface, however, is only seen on the microsecond timescale in the two KMC methods. Kinetic vacancy trapping on the surface and its effect on the segregation rate are discussed. The equilibrium composition profile of CuNi after segregation during annealing is estimated to occur on a timescale of seconds as determined by KMC, a result directly comparable to nanoscale experiments.

Social inequalities associated with COVID-19 case fatality rate in Fortaleza, Ceará state, Brazil, 2020.

To analyze the association among social and health inequalities, socioeconomic status, spatial segregation and Case Fatality Rate (CFR) due to COVID-19 in Fortaleza, the state capital of Ceará, Brazil. This was an ecological study of confirmed cases and deaths due to COVID-19. The 119 neighborhoods of Fortaleza were used as units of analysis. Incidence, mortality and apparent CFR indicators due to COVID-19 were calculated between January 1 and June 8, 2020. Socioeconomic indicators were obtained from the 2010 Brazilian Demographic Census. Spatial analysis was performed and local and global Moran's indexes were calculated. There were 22,830 confirmed cases, 2,333 deaths and the apparent CFR was 12.7% (95% CI 11.6;13.9). Significant spatial autocorrelations between apparent CFR (I=0.35) and extreme poverty (I=0.51), overlapping in several neighborhoods of the city, were found. The apparent CFR due to COVID-19 is associated with the worst socioeconomic and health status, which shows the relationship between social inequalities and health outcomes in times of pandemic.

On the Relationship between Poverty Segregation and Homelessness in the American City and Suburb

Although existing scholarship notes that homelessness thrives in concentrated poverty, models estimating the association between the intensity of residential poverty segregation and local homelessness rates across communities remain absent from the literature. To fill this gap, the author considers this relationship for 272 homelessness Continuums of Care covering urban and suburban spaces spanning 43 states and the District of Columbia. Models suggest that poverty segregation is positively associated with the expected homelessness rate of a Continuum of Care, a relationship that remains significant when controlling for a range of established drivers of the condition. The author discusses this finding within a framework qualifying residential poverty segregation as both a cause and a consequence of the local prevalence of economic disadvantage that predicts homelessness via its relationship with disadvantage and unique spatial effects.

Coupling rheology and segregation in granular flows

Abstract

Analysis of internal cracks in high carbon casting bloom induced by soft reduction process and its improvement using numerical simulations and industrial experiments

To comprehensively investigate and improve the internal cracks in high carbon casting bloom induced by the soft reduction process, a three-dimensional mechanical model was developed to calculate the cracking zone, centre solid fraction and the strain states in as-cast bloom. In the present work, the specific relationship between cracking zone area, centre solid fraction and maximum equivalent strain in cracking zone has been established under a number of withdrawal machines. A two-stage sequential soft reduction method was carried out for high carbon bearing steel, which aims to provide theoretical basis for improving the internal quality and effectively decrease the risk of internal cracks. According to the experimental results, the internal cracks were effectively alleviated and center shrinkage cavities were nearly eliminated by optimum designed experiments. Along the bloom central part, the proportion of length where the segregation rate is between 0.95 and 1 has been increased from 16.7% to 91%, and the fluctuation of carbon distribution in the center line of as-cast bloom was decreased to obtain the high homogeneity of the internal structure. In addition, grade of banded carbide in the hot-rolled wire decreased accordingly from 2.5 to 1.67.

An extended flame index partitioning for partially premixed combustion

Compared to partially premixed combustion (or combustion of non-homogeneous reactants in general), fully premixed and diffusion flames represent only two asymptotic limits of combustion modes. However, the deep knowledge accumulated over the years on these two elementary and archetypal flame prototypes is such that they remain the cornerstone and reference building blocks of most combustion modelling proposals. Therefore, from a general point of view, being able to distinguish between premixed and non-premixed modes of combustion thanks to a flame index appears as a quite appealing but challenging task that still concentrates many research efforts. Indeed, the availability of such an index is not only appealing to proceed with the analysis of either experimental or computational data issued from DNS (or highly resolved LES) databases. It is also an essential ingredient to elaborate advanced flamelet-based multiregime combustion models on the basis of single regime tabulated flamelet databases. In the present study, a new definition of the premixedness index is proposed for partially premixed combustion. It is based on a weighted form of the cross-scalar dissipation rate of the mixture fraction and progress variable , i.e. quantities that have been previously identified as relevant parameters to describe partially premixed combustion regimes. The relevance of the corresponding index is assessed through a detailed computational procedure that includes three successive validation subsets: counterflow flames (including premixed, rich partially-premixed, and diffusion flames), (ii) stabilised triple flames for three distinct values of the inlet mixture fraction gradient, and finally (iii) unsteady flame kernel developments in non-homogeneous mixtures of fresh reactants, which are characterised by various initial levels of the segregation rate between the fuel and oxidiser. The proposed premixedness index and its counterpart are used as the weighting coefficients between tabulated premixed flamelets (TPF) and tabulated diffusion flamelets (TDF) data, which have been parameterised as functions of and . It is noteworthy that, in contrast to some previous proposals of the literature, the present flame index does not require the consideration of any other quantities in addition to those already used to parameterise the flamelets databases, i.e. and . The validation procedure makes use of steady and unsteady processes with a priori and a posteriori analyses. In both cases, the comparisons between the results obtained with the proposed flame partitioning and detailed chemistry (DC) computations lead to a satisfactory level of agreement and, from a general viewpoint, the level of agreement is better than the one obtained with either premixed or diffusion flamelet-based models.