Linear Change Research Articles

The Impact of Different Excavation Support Structures on the Deformation and Stability of Adjacent Station and Tunnels

This study uses the finite element software Midas GTS NX (2019), combined with actual engineering projects, to establish numerical models and analyze the impact of different support types (pile-anchor support and double-row pile support) on the excavation of foundation pits near metro station tunnels. The results indicate that under both support methods, the vertical displacement of the tunnel is the greatest at the interface between the station and the tunnel, with greater vertical displacement occurring under double-row pile support. Under pile-anchor support, the horizontal displacement of the tunnel reaches its maximum value during the sixth excavation stage, while under double-row pile support, the horizontal displacement increases steadily, and the overall displacement is small. The horizontal displacement under pile-anchor support is significantly greater than that under double-row pile support. For the station, the maximum vertical displacement under pile-anchor support is smaller than that under double-row pile support. The horizontal displacement under pile-anchor support exhibits a linear change, while under double-row pile support, the displacement continuously increases from the end of the foundation pit farther from the excavation to the end closer to it. The model tests are consistent with the numerical simulation results, verifying the correctness of the numerical simulation. This study can provide references for relevant engineering projects to ensure the safety and stability of metro structures.

Cardiometabolic Trajectories Preceding Dementia in Community-Dwelling Older Individuals

Poor cardiometabolic health is a risk factor associated with cognitive impairment in later life, but it remains unclear whether cardiometabolic trajectories can serve as early markers associated with dementia. To compare cardiometabolic trajectories that precede dementia diagnosis with those among individuals without dementia. This case-control study analyzed a sample drawn from community-dwelling participants in the Aspirin in Reducing Events in the Elderly (ASPREE) study. Recruitment through primary care physicians occurred between March 2010 and December 2014, with participants followed up for a maximum of 11 years. Dementia cases were matched on sociodemographic characteristics and time of diagnosis to dementia-free controls. Data analysis was performed between February and June 2024. Body mass index (BMI), waist circumference, systolic and diastolic blood pressure, glucose levels, high- and low-density lipoprotein (HDL and LDL) and total cholesterol levels, and triglyceride levels were measured repeatedly between 2010 and 2022. Dementia (Diagnostic and Statistical Manual of Mental Disorders [Fourth Edition] criteria) was adjudicated by an international expert panel. Among 5390 participants (mean [SD] age, 76.9 [4.8] years; 2915 women [54.1%]), there were 2655 individuals (49.3%) with less than 12 years of education. The study included 1078 dementia cases and 4312 controls. Up to a decade before diagnosis, dementia cases compared with controls had lower BMI for all years from -7 years (marginal estimate, 27.52 [95% CI, 27.24 to 27.79] vs 28.00 [95% CI, 27.86 to 28.14]; contrast P = 002) to 0 years (marginal estimate, 26.09 [95% CI, 25.81 to 26.36] vs 27.22 [95% CI, 27.09 to 27.36]; contrast P < .001) and lower waist circumference for all years from -10 years (marginal estimate, 95.45 cm [95% CI, 94.33 to 96.57 cm] vs 97.35 cm [95% CI, 96.79 to 97.92 cm]; contrast P = .003) to 0 years (marginal estimate, 93.90 [95% CI, 93.15 cm to 94.64 cm] vs 96.67 cm [95% CI, 96.30 to 97.05 cm]; contrast P < .001); cases also had a faster decline in BMI (linear change β, -0.13 [95% CI, -0.19 to -0.08]) and waist circumference (linear change β, -0.30 cm [95% CI, -0.51 to -0.08 cm]). Compared with controls, cases generally had higher HDL levels, in particular from 5 years (marginal estimate, 62.57 mg/dL [95% CI, 61.59 to 63.56 mg/dL] vs 60.84 mg/dL [95% CI, 60.35 to 61.34 mg/dL]; contrast P = .002) to 3 years (marginal estimate, 62.78 mg/dL [95% CI, 61.82 to 63.74 mg/dL] vs 61.08 mg/dL [95% CI, 60.60 to 61.56 mg/dL]; contrast P = .002) before dementia but with a decline in levels just before diagnosis (linear change β, -0.47 mg/dL [95% CI, -0.86 to -0.07 mg/dL]). Dementia cases had lower systolic blood pressure and triglyceride levels in the decade before diagnosis and higher LDL and total cholesterol levels, but these were not significantly different from controls. In this study of older individuals, decline in BMI, waist circumference, and HDL occurred up to a decade before dementia diagnosis. These findings provide insights into cardiometabolic changes preceding dementia and the potential for early monitoring and intervention.

The changing law of underwater explosion shock wave parameters with hydrostatic pressure

The effects of hydrostatic pressure on shock wave parameters were analyzed by using a combination of experiments and numerical simulations in this paper. The functional relationship between the overpressure peak and hydrostatic pressure was established, and the functional expression between the slope of the linear change and the specific distance was obtained. Underwater explosion experimental data were obtained for 0.3 g Pentaerythritol Tetranitrate (PETN) under four working conditions with initial pressures of 0.1, 0.25, 0.5, and 1 MPa. The underwater explosion of 0.3 g PETN was simulated under 11 working conditions with initial pressures ranging from 0.1 to 30 MPa using ANSYS software. In the simulation, the effects of water depth on the density of the water medium and the speed of sound were considered. The accuracy of the simulation was verified in comparison with the experimental data. According to the simulation results, the overpressure peak of the shock wave (the difference between the positive shock wave pressure and hydrostatic pressure), the decay characteristic time θ, the propagation speed, the impulse, and the specific shock energy with the change rule of hydrostatic pressure can be obtained. The results show that the decay characteristic time θ, the impulse, and the specific shock energy decreased with increasing hydrostatic pressure, and the decay amount increased with increasing distance. The overpressure peak of the shock wave and propagation speed linearly change with increasing hydrostatic pressure, and as the distance increases, the increase in the overpressure peak value decreases.

Effects of Light Versus Very Heavy Resisted Sprint Training on Multidirectional Speed in Semi-professional Soccer Players.

Baena-Raya, A, Robles-Ruiz, J, Pérez-Castilla, A, Pareja-Blanco, F, and Rodríguez-Pérez, MA. Effects of light versus very heavy resisted sprint training on multidirectional speed in semi-professional soccer players. J Strength Cond Res 39(2): e155-e161, 2025-The purpose of this study was to evaluate the effects of an 8-week resisted linear sprint training (RST) program with 2 loading conditions (light vs. very heavy) on linear sprint (LS), curve sprint (CS), and change of direction (COD) performance in young soccer players. Thirty-eight male under-19 soccer players were assessed for 30-m LS, CS, and modified 505 COD tests. Players were randomly allocated into 3 groups: control ( n = 18), light ( n = 10), and very heavy RST ( n = 10). Light and very heavy RST groups performed RST with external loads resulting in a 25 and 75% velocity loss from the player's maximal LS velocity, respectively. The control group did not perform any sprint training. Significant group × time interactions were observed for LS, CS, and COD performances ( p < 0.05). The control group showed no performance improvement. Both RST groups showed significant improvements in LS at 10-, 20-, and 30-m ( p ≤ 0.03; effect size [ES] ≥ 0.62), whereas no significant changes were observed for the split times ( p > 0.05). CS performance was significantly increased by the 2 RST groups ( p ≤ 0.03; ES ≥ 0.60), except for light RST on CS right side at 17-m ( p = 0.09; ES = 0.46). Change of direction performance was only significantly enhanced by the very heavy RST group ( p ≤ 0.001; ES ≥ 0.80). No significant changes between RST groups were observed. In conclusion, using both light and very heavy RST can enhance LS and CS performance, whereas very heavy RST is recommended to optimize COD performance in young soccer players.

Learning differently

Learning is predicated on turning towards new ideas and competences, and thus turning away from previous practices. Thus, with learning comes its necessary twin: forgetting. It is a mixed bag of blessings, for individuals as well as for organizations. On the one hand, it is argued that organizational forgetting helps to prevent further reproduction of old pathologies. On the other, it may signify loss of communal identity and discontinuity. The managerialist turn under neoliberalism brought a dogma of imperative of constant change, which results in erosion and disintegration of structures and communities and undermines resistance. This article is focussed on the idea of learning differently, which incorporates forgetting but with an awareness and reflexivity of what is being lost. The curating of memory helps not just to preserve memories and knowledge but to rediscover the past for the needs of the present. Learning differently requires a thoughtful relationship with the past and may support regeneration, instead of linear change management.

Preparation and corrosion resistance to cathode materials for lithium‐ion batteries of CA6 foam ceramics

AbstractCA6 foam ceramics (CA6‐FCs) with CA6 as the main crystalline phase were prepared by adding CA6 powder through gel casting process, which reduced the severe shrinkage in the reaction synthesis process of CA6. This simple preparation process can realize the industrial production of CA6‐FCs. The linear change and physical properties of CA6‐FCs can be controlled by adjusting the additional amount of CA6 powder and the solid content of the slurry. The corrosion resistance of CA6‐FCs is better than that of the current mainstream mullite thermal insulation materials in lithium‐ion battery cathode materials. Through the simple process of this study, on the basis of industrial production, CA6‐FCs can replace mullite lightweight thermal insulation materials to improve the alkali corrosion resistance, service life, and maintain production safety of kiln lining.

Response of Leaf Non-Structural Carbohydrates to Elevation in Dioecious Plants, Populus cathayana and Hippophae rhamnoides

Non-structural carbohydrates (NSCs) can reflect the balance of resource allocation and trade-offs, as well as the adaptability of plants to the environment. Alterations in environmental conditions across an elevation gradient may impact the carbon balance within leaves. Nonetheless, it remains highly uncertain whether the effect of elevation on NSCs differs among species and sexes. To reveal the response patterns of leaf NSCs in dioecious plants with elevation, Populus cathayana Rehd. and Hippophae rhamnoides L., distributed at four elevations in the subalpine region of western Sichuan, China, were selected, and female and male leaves were sampled and measured for their contents of NSCs, soluble sugar, and starch. Meanwhile, the relationships of NSCs, soluble sugar, and starch with leaf nitrogen and phosphorus were analyzed. The results showed that the elevational patterns of NSCs were mainly dependent on species and were slightly affected by sex. Leaf NSCs in both sexes of P. cathayana did not exhibit significant linear changes, whereas those in H. rhamnoides increased significantly and linearly with elevation. For P. cathayana, a significant increase in leaf starch with elevation was only found in female plants and may benefit from phosphorus deficiency, as it was significantly negatively correlated with phosphorus. However, leaf soluble sugar and starch between sexes of H. rhamnoides showed similar patterns of significant increases with elevation, and they were not correlated significantly with nitrogen and phosphorus. This might be due to H. rhamnoides, which is a nitrogen-fixing plant and thereby did not show deficiencies or limitations in nitrogen and phosphorus, as shown by the decreased or unchanged elevational patterns of nitrogen/phosphorus, starch/phosphorus, and soluble sugar/phosphorus. Overall, our results emphasize that species, rather than sex, is an important factor influencing the elevational pattern of NSCs, but for specific species, such as P. cathayana, in this study, there was a divergence in the elevational response of the allocation of starch and soluble sugar between sexes, reflecting the specific adaptive strategies of different plant species or sexes in response to changes in the growing environment.

Concurrent validity of single- and dual-beam timing systems for linear and change of direction speed testing in youth soccer players

This study investigates the concurrent validity of the Sportreact single-beam timing system with a standard dual-beam system for the evaluation of linear and change of direction speed. Forty-two youth soccer players (age = 12.9 ± 1.1 years) performed linear sprints (10 and 30 m splits) and 505 Agility Test. The times were measured by both systems simultaneously. The single-beam timing system was set at a height of 64 cm from the ground, while the dual-beam system was set at 67 and 90 cm for the lower and upper beam, respectively. The results showed very high intraclass correlation coefficients for the 10 m sprint (ICC (95% CI); 0.95 (0.93–0.98)), 30 m sprint (0.99 (0.98–0.99)), and 505 Agility Test (0.98 (0.98–0.99)), with a low typical error of estimates (TEEs (%) = 2.16%, 1.12%, and 1.05%, respectively). However, TEE of 0.046 s in the 10 m sprint test overlapped the smallest worthwhile change (≈0.030 s). Bland-Altman analyses showed 95% LoA ranging from −0.086 to 0.093 s for the 10 m sprint, −0.115 to 0.106 s for the 30 m sprint, and −0.055 to 0.049 for 505 agility tests. The Sportreact single-beam timing system provides a useful tool for linear sprint (≥30 m) and change of direction speed tests only when considering heterogeneous groups but not individual athletes. However, this system should not be used interchangeably with a dual-beam systems for the assessment of linear and change of direction sprint tests in youth team sport players.

TIME-CoExpress: Temporal Trajectory Modeling of Dynamic Gene Co-expression Patterns Using Single-Cell Transcriptomics Data.

The rapid advancements of single-cell RNA sequencing (scRNAseq) technology provide high-resolution views of transcriptomic activity within a single cell. Most routine analyses of scRNAseq data focus on individual genes; however, the one-gene-at-a-time analysis is likely to miss meaningful genetic interactions. Gene co-expression analysis addresses this issue by identifying coordinated gene expression changes in response to cellular conditions, such as developmental or temporal trajectory. Identifying differential co-expression gene combinations along the cell temporal trajectory using scRNAseq data can provide deeper insight into the biological processes. Existing approaches for gene co-expression analysis assume a restrictive linear change of gene co-expression. In this paper, we propose a copula-based approach with proper data-driven smoothing functions to model non-linear gene co-expression changes along cellular temporal trajectories. Our proposed approach provides flexibility to incorporate characteristics such as over-dispersion and zero-inflation rate observed in scRNAseq data into the modeling framework. We conducted a series of simulation analyses to evaluate the performance of the proposed algorithm. We demonstrate the implementation of the proposed algorithm using a scRNAseq dataset and identify differential co-expression gene pairs along cell temporal trajectory in pituitary embryonic development comparing Nxn - / - mutated versus wild-type mice.

Effective Thermal Conductivity of Nanofluids Containing Silicon Dioxide, Titanium Dioxide, Copper Oxide, Polystyrene, or Polymethylmethacrylate Nanoparticles Dispersed in Water, Ethylene Glycol, or Glycerol

The present study represents a continuation of our investigations on the effective thermal conductivity λeff of nanofluids by systematically varying the types of base fluids and particles. For the spherical nanoparticles with mean diameters between (20 and 175) nm, the metal oxides silicon dioxide (SiO2), titanium dioxide (TiO2), and copper oxide (CuO) as well as the polymers polystyrene (PS) and polymethylmethacrylate (PMMA) were selected to cover a broad range for the particle thermal conductivity λp from about (0.1 to 30) W⋅m–1⋅K–1. The corresponding polar base fluids water, ethylene glycol, and glycerol allow to not only vary their thermal conductivity λbf by a factor of more than two, but also their dynamic viscosity by about three orders of magnitude. For the measurement of λeff of the twelve different particle–fluid combinations, i.e., TiO2 or CuO with all three liquids as well as SiO2, PS, or PMMA with water or ethylene glycol, a steady-state guarded parallel-plate instrument (GPPI) associated with an expanded (k = 2) relative uncertainty between 0.022 and 0.032 was used at atmospheric pressure over a temperature range from (283 to 358) K at varying particle volume fractions up to 0.31. The results for the thermal-conductivity ratio λeff·λbf–1 are independent of temperature and show a moderate and relatively linear change as a function of the particle volume fraction. For similar ratios λp·λbf–1, the experimental data for λeff·λbf–1 are also very similar, which are above, close to, or below 1 if λp is larger than, comparable to, or smaller than λbf, respectively. For all nanofluids investigated, the Hamilton–Crosser model can describe the present measurement results and reliable experimental data reported in the literature for λeff·λbf–1 typically within ± 5 %. Overall, the measurement results from this work contribute to an extension of the database for λeff of nanofluids with respect to the investigated wide ranges of systems, temperature, and particle volume fraction.

The effect of plasticizers on rheological, physical and mechanical properties of low cement high alumina gunning refractories

In this research, the effect of different plasticizers with different amounts on the properties of monolithic alumina-based refractories has been investigated. All samples were fired at 1100 °C and 1550 °C. In order to evaluate the desired properties, first the rheological properties of the samples were examined, and then for further investigations, loss on ignition (LOI), percentage of permanent linear changes (PLC), apparent porosity (AP), bulk density (BD) and cold crushing strength (CCS) tests were used. In addition, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and X-ray diffractometry (XRD) were used to characterize the samples. 1 and 2 wt% of CMC, H19, bentonite and ballclay were added to the mixtures as plasticizers. The results of this research showed that the sample containing 1 wt% of ball clay can be the most appropriate one due to its highest strength, highest density and lowest apparent porosity. Moreover, the sample containing 2 wt% of H19 (a commercially available binder) has the optimum properties because of its highest strength for the samples fired at 1100 °C. For the mixtures fired at 1550 °C, the more amount of silica has caused higher cold crushing strength due to the presence of the low melting point phases which are not desired and therefore, the mixtures with less silica can be used.

Effect of chitosan coating and organic acid salts on quality and shelf life of black tiger shrimp stored at 0° C

AbstractThis study investigated the extension of the shelf life of black tiger shrimp stored at 0 °C by applying treatments with organic acid salt solutions combined with chitosan preservation coatings. Four shrimp samples were included: the control sample, the sample treated with 2.5% sodium citrate solution, the sample treated with 2% chitosan solution, and the sample treated with 2.5% sodium citrate solution followed by 2% chitosan. Sensory, chemical, and microbiological quality factors were monitored over 17 days of storage using quality indices such as the quality index (QI) from the quality index method, hypoxanthine, trimethylamine nitrogen (TMA‐N), total volatile basic nitrogen (TVB‐N), and total viable count (TVC) to assess the shrimp's freshness. As a result, QI and hypoxanthine levels increased linearly with storage time in all shrimp samples. TMA‐N and TVB‐N values exhibited two‐phase linear changes corresponding to the autolysis and decomposition stages of the shrimp. The shelf life was determined to be 8 days for the control sample, 12 days for the citrate sample, 13 days for the chitosan sample, and 15 days for the citrate/chitosan sample. Linear regression equations between the indices and storage time, as well as between the quality indices for each sample, were identified.

A Symmetrical Leech-Inspired Soft Crawling Robot Based on Gesture Control.

This paper presents a novel soft crawling robot controlled by gesture recognition, aimed at enhancing the operability and adaptability of soft robots through natural human-computer interactions. The Leap Motion sensor is employed to capture hand gesture data, and Unreal Engine is used for gesture recognition. Using the UE4Duino, gesture semantics are transmitted to an Arduino control system, enabling direct control over the robot's movements. For accurate and real-time gesture recognition, we propose a threshold-based method for static gestures and a backpropagation (BP) neural network model for dynamic gestures. In terms of design, the robot utilizes cost-effective thermoplastic polyurethane (TPU) film as the primary pneumatic actuator material. Through a positive and negative pressure switching circuit, the robot's actuators achieve controllable extension and contraction, allowing for basic movements such as linear motion and directional changes. Experimental results demonstrate that the robot can successfully perform diverse motions under gesture control, highlighting the potential of gesture-based interaction in soft robotics.

Elasticity solution of fixed beams under linear temperature variation: An experimental and numerical study

This article presents the Airy stress function method for predicting the structural response of a fixed beam subjected to a linear temperature distribution, using the superposition principle. In this approach, the fixed-end beam is decomposed into three simply supported beams with unknown reactions and a linear temperature variation. For each loading condition, the suitable Airy’s stress functions were formulated to satisfy the stress equilibrium and strain compatibility equations. The results obtained using this method are subsequently contrasted with those derived from finite element modeling. To validate the analytical and experimental results, two finite element modeling approaches, namely two-dimensional and three-dimensional modeling, are implemented using the ANSYS finite element software. This numerical modeling approach utilizes a sequentially coupled steady-state thermal and static structural analysis. In addition to employing Airy’s stress function method and finite element analysis, experiments were conducted on SS304 rectangular specimens under proper insulation to investigate their thermal bowing response. Samples were tested in a simple thermal bending experimental setup under fixed support conditions, and subjected to conduction-type heating to achieve linear temperature changes along their depth. The analytical method predicts that the beam will not deflect under linear temperature variation in a fixed-beam situation. The numerical analysis results confirm this, showing a minimal deflection, that aligns well with the Airy’s stress function method. However, the deflection measured in the experimental program is significantly larger than the predictions from the analytical method. This method eliminates the complexity involved in applying boundary conditions along with thermal loading on a fixed beam.

General Equation for Expressing the Physicochemical Properties of Aliphatic Alcohols.

In this work, two general equations were proposed to express the nonlinear and linear changes in physicochemical properties of aliphatic alcohols, involving boiling point, refractive index, critical temperature, critical volume, and so on. The two general equations all are expressed with the same six molecular descriptors. The results show that the linear and nonlinear change properties of aliphatic alcohols have good correlations with the same six molecular descriptors. Using the obtained correlation equations, various properties of aliphatic alcohols without experimental values were predicted, involving 15 normal boiling points, 96 refractive indexes, 105 critical temperatures, 109 critical pressures, 100 liquid densities, 136 heat capacities, 107 critical volumes, and 130 enthalpies of the formation of liquid, a total of 798 values. The relationship between the nonlinear and linear change properties can be deduced by using the obtained general equations, which connect different properties of aliphatic alcohols. In addition, this paper combined the general estimation models used in the properties of aliphatic alcohols and aliphatic primary amines, and then, by taking the boiling point and critical temperature as examples, a general estimation model with good correlation and high prediction accuracy was obtained via adding another two molecular structure characteristic parameters. It is a meaningful exploration for establishing general models for monosubstituted alkane RX compounds with different substituents in the future.

Piezoresistivity as a Fingerprint of Ferroaxial Transitions.

Recent progress in the understanding of the collective behavior of electrons and ions has revealed new types of ferroic orders beyond ferroelectricity and ferromagnetism, such as the ferroaxial state. The latter retains only rotational symmetry around a single axis and reflection symmetry with respect to a single mirror plane, both of which are set by an emergent electric toroidal dipole moment. Because of this unusual symmetry-breaking pattern, it has been challenging to directly measure the ferroaxial order parameter, despite the increasing attention this state has drawn. Here, we show that off-diagonal components of the piezoresistivity tensor (i.e., the linear change in resistivity under strain) transform the same way as the ferroaxial moments, providing a direct probe of such order parameters. We identify two new proper ferroaxial materials through a materials database search, and use first-principles calculations to evaluate the piezoconductivity of the double-perovskite CaSnF_{6}, revealing its connection to ferroaxial order and to octahedral rotation modes.

A Comparative Study of ARIMA and ETS Models for Time Series Forecasting

The primary focus of this investigation is the ARIMA and ETS models, which are examples of prominent time series forecasting methods. The efficacy of these solutions should be evaluated by comparing them to seasonal datasets. ARIMA models are more predictive of financial outcomes when working with time series data that lacks seasonal patterns, as opposed to data that contains seasonal patterns, which typically include linear patterns and changing conditions. This is due to the fact that seasonal patterns are more predictive of the future. The stock values of Google and the number of visits from Australia are the most reliable indicators. ETS is an effective instrument for simulating powerful seasonal trends because it provides more accurate estimates for data that can be broken down into regular seasonal cycles. The results of this study emphasise the challenges associated with the production of long-term forecasts by demonstrating that both methodologies increase the level of uncertainty when applied to projections over time. The findings are specifically tailored to the unique characteristics of time series data, and it is recommended that a forecasting model be implemented in response. ETS surpasses ARIMA in analysing data containing seasonal trends, since ARIMA neglects to account for these patterns. This study also proposes to investigate hybrid models that include the benefits of both ARIMA and ETS.

Impact of mandibular overdentures on maxillary resorption and its association with masticatory function: A prospective longitudinal study with 3 years of follow-up.

This longitudinal clinical study monitored annually the maxillary and mandibular bone remodeling and masticatory function in complete denture (CD) wearers rehabilitated with implant-retained mandibular overdentures (MO) over three years and combined radiographic and masticatory function data to assess the correlation between bone remodeling and masticatory function. Thirty-nine MO wearers were monitored annually to assess changes in: i) residual ridge in the anterior and posterior maxillary region; ii) posterior height and posterior area index (PAI) in the mandible; and iii) masticatory function. Bone remodeling was measured through linear and angular measurements using panoramic radiographs. Masticatory function was evaluated by swallowing threshold test, to determine the median particle size (X50) and homogenization index (B). A mixed-effects multilevel regression model estimated differences between radiological and masticatory parameters over time, with associations verified using Pearson's correlation test. Significant changes in mandibular bone variables (PAI and L1/R1, L2/R2, L3/R3; p ≤ 0.01) occurred when transitioning from CD to MO, showing a reduction in PAI values and slight reduction in mandibular linear measurements. Improvements in masticatory parameters were also observed, highlighting the benefits of transitioning to MO. Over three years of MO usage, significant changes in all radiographic bone parameters were found, with increased PAI and maxillary bone values in the first year. The correlations between masticatory function and radiological parameters indicated that mandibular morphology can significantly influence masticatory function especially in patients wearing CDs. Following the transition to MO, only one consistent significant correlation was observed between X50 and R3/L3 at the 1-year and 3-year intervals. Continuous changes in bone parameters were observed in MO wearers, with stabilization of maxillary ridge resorption and ongoing mandibular remodeling, alongside slight changes in masticatory function, suggesting transitory correlations between linear changes in the posterior region of mandible and masticatory function over time.

A starch-polyvinyl alcohol polymer film-based on-site sensor for ammonia: a cost effective day-to-day technique for monitoring fish and meat spoilage.

Ammonia or biogenic amines released by protein degradation during food spoilage have various ill effects on human health and the environment. Herein, an economical colorimetric bisphenol-based sensor was developed from inexpensive reagents and a simple synthetic method for detecting ammonia and monitoring food spoilage. The slightest addition of NH3 significantly changed the absorption of BP, which was reflected in the detection limit value for NH3 (7.89 × 10-7 M). The film-based sensor developed by immobilizing BP onto a starch-polyvinyl alcohol (PVA) matrix enabled both the rapid and visual onsite detection of ammonia and the determination of the RGB contents using a digital application. The blue content of the film linearly changed with the extent of the spoilage of fish and meat samples. This linear change enabled the film-based sensor to act as an excellent food quality indicator for hourly food quality monitoring. The aerial reversibility of the film empowered its use for many cycles without the use of any reagents.

Three-dimensional assessment of root changes after Le Fort I osteotomy

The study aim was to assess the volumetric, linear, and morphological changes of the maxillary incisor, canine, and premolar roots following Le Fort I osteotomy. Sixty patients (585 teeth) were included retrospectively from among individuals who underwent combined orthodontics and orthognathic surgery. The study group comprised 30 patients who underwent orthodontics and one-piece Le Fort I osteotomy, while the control group consisted of 30 patients who underwent orthodontics and bilateral sagittal split osteotomy but no maxillary surgery. CBCT scans were obtained at four time points: preoperative, 6 months, 1 year, and 2 years postoperative. A fully automated three-dimensional evaluation protocol was utilized to assess root changes of the maxillary teeth. Significant differences in the apical and middle parts of the teeth were observed between the study and control groups at 1 and 2 years postoperative, with greater percentage changes in the study group (all P<0.05). Greater root remodelling in the canines, first and second premolars was observed in the study group (all P<0.005). Spearman correlation analysis indicated a positive relationship between root remodelling and maxillary advancement, with larger advancements contributing to increased root remodelling in the apical and middle root parts (both P<0.05). These findings can be valuable for surgeons and orthodontists in evaluating root changes.