Compensation Process Research Articles

Addressing System Challenges in Mental Health Services Research for Youth in the Child Welfare System: Insights From the Foster Care Family Navigator Trial

ABSTRACTChild welfare‐involved (CWI) youth have high rates of unaddressed mental health needs, and system‐level barriers (e.g., inadequate coordination between child welfare agencies and other systems designed to serve CWI youth) are one major reason why disparities in mental health services' access continue to persist for CWI youth. This Research Note aims to inform the mental health services field about system‐level challenges to conducting real‐world, health services research with CWI youth and their families. We present challenges experienced in conducting our NIMH‐funded Foster Care Family Navigator (FCFN) trial focused on development and preliminary testing of a clinic‐embedded navigation intervention designed to improve detection of foster care youth services need, linkage to and engagement in community‐based mental health services. Systems‐level challenges that impacted proposed research trial design and data collection included: (1) Limited system staff time and compensation processes; (2) Staff training and knowledge; and (3) System disruptions. Health services research geared toward increasing access to mental health services to CWI youth must incorporate multiple complex design considerations prior to intervention development and delivery including longer (than 12 months) intervention development phases, detailed contingency plans for intervention delivery and integrated tailored, ongoing support and training for staff with existing clinic workflows. In this way, structural challenges to access to care that researchers are trying to ameliorate for CWI and other underserved, minoritized populations are not being inadvertently perpetuated through research study designs.

Neurophysiological Markers of Adaptation and Compensation Following Lower Limb Amputation: An Analysis of EEG Oscillations and Clinical Predictors from the DEFINE Cohort Study

Background: Neuroplasticity, involving cortical and subcortical reorganization, plays a critical role in the adaptation and compensation process post-amputation. However, underlying neurophysiological changes remain unclear, particularly in brain oscillations. Methods: This is a cross-sectional analysis that includes baseline data from 48 individuals with lower limb amputation from our DEFINE Cohort Study project. EEG data were collected using a 64-channel system during a 5-min resting-state period. Preprocessed data were analyzed for delta and alpha oscillations across frontal, central, and parietal regions. Logistic regression models examined associations between EEG oscillations and clinical variables, including cognition (MoCA), functional independence (FIM), and phantom limb sensations (PLS). Results: The multivariate logistic regression analysis revealed distinct patterns of association between EEG oscillations and clinical variables. Delta oscillations were inversely associated with cognitive scores (OR: 0.69; p = 0.048), while higher delta power was related to the absence of PLS (OR: 58.55; p < 0.01). Frontal alpha power was positively linked to cognitive function (OR: 1.55; p = 0.02) but negatively associated with functional independence (OR: 0.75; p = 0.04). Conclusions: These findings suggest that lower frequencies, such as delta oscillations, play a role as potential compensatory brain rhythms. In contrast, alpha oscillations may reflect a more adapted pattern of brain reorganization after amputation.

Mapping the aging brain: Insights into microstructural changes from free water-corrected fractional anisotropy.

Aging has a significant impact on brain structure, demonstrated by numerous MRI studies using diffusion tensor imaging (DTI). While these studies reveal changes in fractional anisotropy (FA) across different brain regions, they tend to focus on white matter tracts and cognitive regions, often overlooking gray matter and motor areas. Additionally, traditional DTI metrics can be affected by partial volume effects. To address these limitations and gain a better understanding of microstructural changes across the whole brain, we utilized free water-corrected fractional anisotropy (FAt) to examine aging-related microstructural changes in a group of 20 young adults (YA) and 24 older adults (OA). A voxel-wise analysis revealed that YA had higher FAt values predominantly in white matter tracts associated with both motor and non-motor functions. In contrast, OA showed higher levels of FAt primarily in gray matter regions, including both subcortical and cortical motor areas, and occipital and temporal cortices. Complementing these cross-sectional results, correlation analyses within the OA group showed that many of these changes are further exacerbated with increasing age, underscoring the progressive nature of these microstructural alterations. In summary, the distinct patterns of FAt changes in gray versus white matter with aging suggest different underlying mechanisms. While white matter FAt values decrease, likely due to axonal degeneration, the increase in gray matter FAt could reflect either compensatory processes or pathological changes. Including behavioral data in future studies will be crucial for understanding the functional implications of these microstructural gray matter changes and their effects on cognitive and motor functions.

The association between neighborhood built environment and mental health among older adults in Hangzhou, China.

In the context of population ageing, the age-friendliness of neighborhood built environment (NBE) is increasingly recognized as essential for enabling ageing in place. However, while much research has focused on the impact of NBE on the physical health of older adults, its relationship with mental health (MH) remains underexplored, especially the pathways through which NBE indicators influence MH. This study measured NBE using ten indicators across three categories: daily travel (including barrier-free travel, elevator, rest seat, diversion of pedestrian and vehicle, road surface and public toilet), healthcare services (including public canteen and elderly care), and social participation (including outdoor fitness space and indoor activity space). It examined the association between NBE and MH among 1405 older adults in Hangzhou, China, utilizing structural equation models to explore potential pathways. The findings revealed a significant and robust direct association between outdoor fitness spaces and MH of older adults. Additionally, physical health significantly mediated the association between road surface and MH, while social interaction played a crucial mediating role between public toilets, public canteens, elderly care, indoor activity spaces, and MH. Although the durations and types of leisure activities did not independently mediate the NBE-MH relationship, leisure durations effectively mediated it through both physical health and social interaction, whereas leisure types mediated it through social interaction. This study empirically supported the compensatory process and enabling process proposed by the ecological theory of aging, offering valuable empirical evidence to inform policies aimed at enhancing NBE to promote MH among older adults.

Contributions of short- and long-range white matter tracts in dynamic compensation with aging.

Optimal brain function is shaped by a combination of global information integration, facilitated by long-range connections, and local processing, which relies on short-range connections and underlying biological factors. With aging, anatomical connectivity undergoes significant deterioration, which affects the brain's overall function. Despite the structural loss, previous research has shown that normative patterns of functions remain intact across the lifespan, defined as the compensatory mechanism of the aging brain. However, the crucial components in guiding the compensatory preservation of the dynamical complexity and the underlying mechanisms remain uncovered. Moreover, it remains largely unknown how the brain readjusts its biological parameters to maintain optimal brain dynamics with age; in this work, we provide a parsimonious mechanism using a whole-brain generative model to uncover the role of sub-communities comprised of short-range and long-range connectivity in driving the dynamic compensation process in the aging brain. We utilize two neuroimaging datasets to demonstrate how short- and long-range white matter tracts affect compensatory mechanisms. We unveil their modulation of intrinsic global scaling parameters, such as global coupling strength and conduction delay, via a personalized large-scale brain model. Our key finding suggests that short-range tracts predominantly amplify global coupling strength with age, potentially representing an epiphenomenon of the compensatory mechanism. This mechanistically explains the significance of short-range connections in compensating for the major loss of long-range connections during aging. This insight could help identify alternative avenues to address aging-related diseases where long-range connections are significantly deteriorated.

Operando monitoring the redox activity of sodium vanadium titanium phosphate electrodes in organic and aqueous electrolytes by magnetometry

The bulk oxidation states of the transition metals in Na2VTi(PO4)3 are monitored continuously based on magnetic susceptibility variations. It is shown that the same charge compensation processes occur in organic and aqueous electrolytes.

Increasing the post-repair resource of the wheels attachment bolts of transport machinery

Abstract. Problem. The state of war in our country and a significant reduction in the production of new vehicles exacerbated the problem of increasing their operational resource due to repairs. Improving the quality and increasing the efficiency of transport vehicles involves, first of all, the fight against wear and tear, because the reason for their premature failure (from 75 to 90%) is significant wear and tear of parts. A significant number of parts of the main structural units of vehicles are exposed to cyclic loads, so it is quite reasonable to pay attention to the issue of increasing the fatigue strength of products. Considering the significant shortage and high cost of spare parts, an expedient and economically beneficial solution to these problems is the restoration and strengthening of the surface layers of products during repair The parts that mostly fail prematurely and require repair using rational methods of recovery include the bolts of fastening the wheels of buses - a very common vehicle that is intensively operated in very difficult conditions. The development of effective technological processes for the restoration of bolts with a simultaneous increase in the post-repair resource at the lowest costs is definitely an urgent issue, because it will prevent another possible premature failure in operation Goal. The purpose of the work is to restore and increase the post-repair resource of the bolts for fastening the disks of the rear wheels of the bus. Methodology. The subject of the study were the serial bolts for fastening the discs of the rear wheels of the bus made of 40X steel after quenching and tempering at 500-550º C with a trostite-bainite structure and a hardness of 35-37 НРС. For vibro-arc surfacing, electrode wire Нп-30ХГСА with a diameter of 1.2 mm was used. Food carbon dioxide was used as a protective gas, and a 5% solution of soda ash in water was used as an accelerating coolant. After surfacing, the surface was subjected to bombardment with low-energy (up to 3 keV) titanium ions in an argon environment at the Bulat - 3t installation. After the specified methods of bolt processing, the roughness and surface profile were evaluated, the microstructure was studied, and the mechanical properties were determined. The strength limit of the slotted part of the bolt was determined using special samples on the CD10 universal machine (made in Germany). Cyclic tests of welded samples were carried out according to the scheme "tension during rotation of the cantilever-loaded sample" on the UMP-02 machine. Tensile tests were performed according to standard methods. Originality. To increase the cyclic durability and wear resistance of bolts, a modern method of surface modification was used - ion bombardment with low-energy ions (without coating), which made it possible to strengthen the surface layer without losing plasticity. An increase in the resource was achieved due to a change in the state of the surface (obtaining ultrafine crystalline nano-sized grain, healing of surface stress concentrators), and a change in the mechanism of plastic deformation - from dislocation to rotational with grain-boundary sliding of ultra-fine grains. Practical value. The recommended mode of vibro-arc surfacing provides surface hardness for the possibility of further mechanical processing without additional thermal weakening, which increases the cost-effectiveness of the process of compensation of the worn surface layer. Modification of the surface by ion brombarbing after surfacing made it possible to increase the cyclic durability by 2 times, significantly increase the static strength without loss of plasticity, and increase the hardness to ensure wear resistance.

Research on Production Optimization Based on Simulated Annealing Algorithm and Bayesian Sampling Optimization Model

Simulated annealing algorithm is an optimization algorithm in the field of machine learning that is good at processing high-dimensional complex data and seeking global optimal solutions. In this research, the simulated annealing algorithm is combined with mixed integer linear programming and applied to the production decision optimization scenario. Firstly, the normal distribution and hypothesis testing method and the Bayesian sampling optimization model are used to formulate the corresponding sample sampling scheme. This method provides the most comprehensive possible picture of the yield of a complete batch of parts, semi-finished products, or products with the minimum number of samples and the smallest batch size. Secondly, this paper takes the profit maximization of the enterprise as the objective function to model the production inspection and compensation process of the enterprise and uses the simulated annealing algorithm to solve the corresponding optimal production decision scheme. In general, this research not only expands the application scope of simulated annealing algorithm, but also provides a feasible optimization method and reference for similar multi-objective production decision-making problems.

The Land Acquisition Compensation Process for Public Interest based on Law No. 2 of 2012

Law No. 2 of 2012 concerning Land Acquisition for Public Interest is carried out with the aim of providing land for development for the public interest by terminating the legal relationship between land rights holders and their land rights by providing appropriate compensation. And its implementing regulations are regulated in Presidential Regulation Number 71 of 2012. In the implementation of the Land Acquisition process, there are often obstacles in the process or become legal and social conflicts between land owners and institutions that need land. On this basis, the study aims to determine the process of providing land compensation that meets the principles of the Land Acquisition Law and this study is expected to be able to be used as a reference if similar problems occur. The method used in this study is Normative Jurisprudence, with a Statute Approach that is relevant to the Land Acquisition Law.The results of the study indicate that land acquisition for public interest as regulated in the Land Acquisition Law aims to create justice between the rights of land owners and the needs of national development. This process involves providing fair compensation, including physical and non-physical compensation, while taking into account the socio-economic balance of land owners. However, in its implementation, conflicts often arise related to the legitimacy of ownership and community resistance. This study emphasizes the importance of deliberation and dignified compensation mechanisms to maintain socio-economic stability. The conclusion of the research isCompensation is carried out transparently and through deliberation, taking into account the balance between landowner rights and development needs. The form of compensation includes physical and non-physical, aiming to maintain the socio-economic stability of landowners while supporting national development and protecting the rights of all parties in need.

Complex treatment of the vibration disease by reflexotherapy and pulsed magnetic stimulation

Introduction. In the basic treatment of a number of diseases, including neuropathies, which are one of the main manifestations of vibration disease (VD), preference is given to the complex use of several physical methods, which allows obtainingt an effect that is not achievable if only one of the influencing factors is used. The aim of the study. Improving the effectiveness of drug-free treatment of the vibration disease associated with exposure to local vibration. Materials and methods. Using the combined effects of acupuncture (IRT) and pulsed magnetic stimulation (MS), there were treated thirty eight male patients (average age 47.6±4.3 years, average work experience in contact with local vibration – 20.8±3.4 years). All cases had a diagnosis of VD associated with exposure to local vibration. The effectiveness of treatment was assessed by the results of EEG, electroneuromyography (ENMG), and registration of somatosensory evoked potentials (SSVP), algesimetry, and determination of vibration sensitivity. A psychological examination was conducted. Results. After treatment, an improvement in indices of visual and somatosensory evoked potentials, vibration sensitivity and algesimetry data was found. There was an increase in the time of propagation of arousal along afferent and efferent axons, and the mnestic-attentional and psychoemotional spheres of activity were normalized. The use of therapy methods weakened the chronization of the pathological process, prevented patients from becoming ill. Limitations. The limitation of the study may be that the testing of non-drug treatments was not compared with the results obtained with drug therapy. Conclusion. The proposed therapy has expanded the possibilities of rehabilitation in VD patients. The use of IRT in combination with MS increased the level of compensatory and restorative processes in the central and peripheral nervous systems. The proposed treatment method does not require patients to stay in a hospital, which will reduce treatment costs.

Locus coeruleus signal intensity and emotion regulation in agitation in Alzheimer's disease.

Hyperphosphorylated tau accumulation is seen in the noradrenergic locus coeruleus from the earliest stages of Alzheimer's disease onwards and has been associated with symptoms of agitation. It is hypothesized that compensatory locus coeruleus-noradrenaline system overactivity and impaired emotion regulation could underlie agitation propensity, but to our knowledge this has not previously been investigated. A better understanding of the neurobiological underpinnings of agitation would help the development of targeted prevention and treatment strategies. Using a sample of individuals with amnestic mild cognitive impairment and probable mild Alzheimer's disease dementia from the German Center for Neurodegenerative Diseases (DZNE)-Longitudinal Cognitive Impairment and Dementia (DELCODE) study cohort (N = 309, aged 67-96 years, 51% female), we assessed cross-sectional relationships between a latent factor representing the functional integrity of an affect-related executive regulation network and agitation point prevalence and severity scores. In a subsample of individuals with locus coeruleus MRI imaging data (N = 37, aged 68-93 years, 49% female), we also investigated preliminary associations between locus coeruleus MRI contrast ratios (a measure of structural integrity, whole or divided into rostral, middle, and caudal thirds) and individual affect-related regulation network factor scores and agitation measures. Regression models controlled for effects of age and clinical disease severity and, for models including resting-state functional MRI connectivity variables, grey matter volume and education years. Agitation point prevalence showed a positive relationship with a latent factor representing the functional integrity (and a negative relationship with a corresponding structural measure) of the affect-related executive regulation network. Locus coeruleus MRI contrast ratios were positively associated with agitation severity (but only for the rostral third, in N = 13) and negatively associated with the functional affect-related executive regulation latent factor scores. Resting-state functional connectivity between a medial prefrontal cortex region and the left amygdala was related to locus coeruleus MRI contrast ratios. These findings implicate the involvement of locus coeruleus integrity and emotion dysregulation in agitation in Alzheimer's disease and support the presence of potential compensatory processes. At the neural level, there may be a dissociation between mechanisms underlying agitation risk per se and symptom severity. Further studies are needed to replicate and extend these findings, incorporating longitudinal designs, measures of autonomic function and non-linear modelling approaches to explore potential causal and context-dependent relationships across Alzheimer's disease stages.

Exploring habenular structural connectivity in Parkinson's disease: insights from 7T MRI study.

PD is marked by both motor and non-motor symptoms, with its pathophysiology involving many neural pathways and brain regions beyond the dopaminergic system. While mainly gray matter changes have been noted, white matter changes also exist in PD. Habenula, known for its role in reward processing, mood regulation, motor functions, and cognition, is of interest due to its connection to mood disorders in PD. This study aims to explore diffusion metrics and structural connectivity changes in the habenula of newly diagnosed PD patients using 7T MRI. 84 PDs and 38 HCs were recruited from Maastricht University Medical Centre. Clinical, demographic, and total Beck Depression Inventory (BDI) scores were recorded. A 7T brain MRI was conducted. Diffusion metrics and structural connectivity were evaluated. The mean diffusion metrics of Hb were not significantly different between the groups. However, in PD patients, there was an increase in mean structural connectivity from the right Hb to the right hippocampus (p = 0.006) and the right fusiform gyrus (p = 0.007). On the left side, enhanced connectivity was observed with the left pallidum (p = 0.040) and left accumbens (p = 0.009). In the PD group, a significant correlation was found between the BDI total score and increased structural connectivity from the right Hb to the left cingulate isthmus (R2 = 0.090, p = 0.003). This pioneering study examines diffusion metrics and structural connectivity of Hb in PD patients using high-resolution 7T MRI. Our findings highlight the habenula's potential role in PD pathophysiology, with altered connectivity suggesting early neurodegenerative or compensatory processes. These results underscore the importance of the habenula as a biomarker for PD and its potential as a therapeutic target.

Динамика неврологического дефицита под воздействием медицинской реабилитации с применением полимодального афферентного воздействия среды виртуальной реальности у постинсультных пациентов

INTRODUCTION. The use of computer technologies in the medical rehabilitation of patients with cerebral infarction and intracerebral hemorrhage makes it possible to effectively influence the processes of restoration and compensation of impaired functions. Virtual reality technologies affect the recovery process, as well as cognitive functions through active multimodal sensory afferentation of the gaming virtual space. AIM. To assess the dynamics of neurological deficit in post-stroke patients during the medical rehabilitation in and virtual reality environment. MATERIAL AND METHODS. The study involved 37 patients (23 women and 14 men) with MI and ICH with established coordination disorders, average age 48±3.9 years, of which 12 patients were in the early recovery period, 25 patients were in the late recovery period). Moreover, 59 patients with post-stroke pain syndrome, average age 58.5±9.94 years. All patients underwent a course of medical rehabilitation based on multimodal afferent influence. Efficacy was assessed using stabilometry, vestibulometry, the Berg, Beck, Spielberg-Hanin scale, visual analogue scale "VAS", PainDetect questionnaire. RESULT AND DISCUSSION. A significant improvement in statokinesiogram parameters according to stabilometry data established after a course of medical rehabilitation with multimodal afferent influence of the reality environment. A decrease from 42 [31;47] points to 30 [29;40] points (p<0.05) in the level of personal loudness according to the Spielberg-Khanin’s questionnaire was revealed. The intensity of post-stroke pain significantly decreased on the VAS’s scale (p<0.05). CONCLUSION. The results obtained demonstrate the possibilities and prospects of using multimodal afferent stimuli from the virtual reality environment in the rehabilitation of motor and cognitive functions in post-stroke patients.

Analysis of Issues in Improving the Compensation Payment Mechanism under Compulsory Insurance for Civil Liability of Vehicle Owners: Uzbekistan and Global Experiences

This article examines the compensation mechanisms under compulsory civil liability insurance for vehicle owners, focusing on the legislation and practices in Uzbekistan and comparing them with international standards. The aim is to identify challenges and opportunities for optimizing these mechanisms to ensure prompt and fair compensation for third-party damages caused by traffic incidents. The methodology includes a comparative analysis of Uzbekistan’s legal framework and case studies with selected countries known for their effective insurance practices. Key findings reveal several inefficiencies in the existing system, including procedural delays, limited claim coverage, and administrative challenges that hinder timely compensation. The study concludes with recommendations for enhancing the compensation process through legislative reforms, adopting best practices, and leveraging technology for better claim processing. Optimising these mechanisms is critical for increasing policyholder confidence, improving insurer accountability, and aligning Uzbekistan’s insurance practices with global standards.

Multi-level transcriptional regulation of embryonic sex determination and dosage compensation by the X-signal element sex-1.

The C. elegans nuclear hormone receptor sex-1 is known to be an embryonic X-signal element that represses xol-1, the sex-switch gene that is the master regulator of sex determination and dosage compensation. Several prior studies on sex-1 function have suggested that sex-1 may have additional downstream roles beyond the regulation of xol-1 expression. In this study we characterize some of these additional roles of sex-1 in regulating the dual processes of sex determination and dosage compensation during embryogenesis. Our study reveals that sex-1 acts on many of the downstream targets of xol-1 in a xol-1-independent manner. Further analysis of these shared but independently regulated downstream targets uncovered that sex-1 mediates the expression of hermaphrodite- and male-biased genes during embryogenesis. We validated sex-1 binding on one of these downstream targets, the male-developmental gene her-1. Our data suggests a model where sex-1 exhibits multi-level direct transcriptional regulation on several targets, including xol-1 and genes downstream of xol-1, to reinforce the appropriate expression of sex-biased transcripts in XX embryos. Furthermore, we found that xol-1 sex-1 double mutants show defects in dosage compensation. Our study provides evidence that misregulation of dpy-21, one of the components of the dosage compensation complex, and the subsequent misregulation of H4K20me1 enrichment on the X chromosomes, may contribute to this defect.

Disruption of macroscale functional network organisation in patients with frontotemporal dementia.

Neurodegenerative dementias have a profound impact on higher-order cognitive and behavioural functions. Investigating macroscale functional networks through cortical gradients provides valuable insights into the neurodegenerative dementia process and overall brain function. This approach allows for the exploration of unimodal-multimodal differentiation and the intricate interplay between functional brain networks. We applied cortical gradients mapping to resting-state functional MRI data of patients with frontotemporal dementia (FTD) (behavioural-bvFTD, non-fluent and semantic) and healthy controls. In healthy controls, the principal gradient maximally distinguished sensorimotor from default-mode network (DMN) and the secondary gradient visual from salience network (SN). In all FTD variants, the principal gradient's unimodal-multimodal differentiation was disrupted. The secondary gradient, however, showed widespread disruptions impacting the interactions among all networks specifically in bvFTD, while semantic and non-fluent variants exhibited more focal alterations in limbic and sensorimotor networks. Additionally, the visual network showed responsive and/or compensatory changes in all patients. Importantly, these disruptions extended beyond atrophy distribution and related to symptomatology in patients with bvFTD. In conclusion, optimal brain function requires networks to operate in a segregated yet collaborative manner. In FTD, our findings indicate a collapse and loss of differentiation between networks not solely explained by atrophy. These specific cortical gradients' fingerprints could serve as a functional signature for identifying early changes in neurodegenerative diseases or potential compensatory processes.

Dynamic response analysis of the vessel under the action of motion compensation equipment

The importance of motion compensation equipment in mitigating wave-induced vessel motion has attracted widespread attention, and many scholars have researched and developed multi-degree-of-freedom motion compensation equipment for marine engineering. However, while compensating for wave-induced motions, motion compensation equipment also has unknown effects on the vessel's motions. To investigate the dynamic response of the vessel under the action of motion compensation equipment, a co-simulation system considering hydrodynamics, multi-body dynamics and control strategy is developed to analyze the dynamic behavior of the motion compensation equipment and the installed vessel. The simulation results show that as the load on the motion compensation equipment increases, the vessel becomes more unstable during the compensation process. A scaled-down shipboard Stewart platform prototype was fabricated and the reliability of the simulation was experimentally investigated in a laboratory tank. The numerical simulation and experimental results show good agreement, the findings of this study can guide the design and operation of the motion compensation equipment.

Remembering Place: The Temporality of Trauma in Rudraprayag After the 2013 Flash Floods

The 2013 flash floods reproduced an everyday that was textural, the returning past of the event combined with gestures from within the everyday, to disorient survivors of the event. I attempt in this essay to analyze the return of the event as producing psycho-spatial affects, drawn from the psyche’s own propensity to return while repressing the event that causes the return, described within psycho-analytic literature as “afterwardsness.” Such afterwardsness is conditioned by the sheer incomprehensibility of environmental change that took place in just three days in the Mandakini Valley between June 15 and June 17, 2013. Following the flood, delays with the recovery process, and particularly with the process of compensation, exacerbate this trauma, leading to an extension of the temporality of trauma infinitely forward.

(Dis)Order in Submarine Fans at Different Observational Scales: An Example From Unit a of the Laingsburg Formation, Karoo Basin

Perceived order in submarine fans is traditionally used to support simple sequence stratigraphic interpretation of allogenic forcing but evidence is typically limited to qualitative evaluation of the geological dataset. Quantitative analysis of the well-studied ‘Unit A’ basin-floor fan from the Laingsburg Formation, Karoo Basin, South Africa suggests a more complex interpretation. We use Markov facies analysis to test for order in the facies successions, and runs tests and power spectral analyses to assess order in the succession of bed thicknesses. Some bed-by-bed order is detectable in the facies successions, but thickness successions are more complex; no order is detectable as simple consistent bed-by-bed runs of thickening or thinning-upwards. Spectral analysis does detect some significant periodicities, but the periods are different in each vertical section analysed, ranging from 35-45 beds, 50-55 beds and from 60-70 beds in respective vertical sections. This perhaps indicates that complex autogenic compensational stacking processes control the details of how patterns emerge at specific locations, even when larger-scale trends do occur in regional stacking of lobes and lobe complexes and there is no evidence for a single, dominant allogenic control the Karoo submarine fan strata. More comprehensively, this analysis suggests that sequence stratigraphic interpretations of outcrop and core deep-water strata will be more robust with integrated quantitative bed thickness and facies trend analysis as a standard approach. Sequence stratigraphic interpretations of deep-water strata should avoid a model-driven single dominant control approach, and instead use the quantitative analysis to more fully explore the typical complexity of these strata.

Imaging geometric simulation and vibration influence analysis of rotary scanning remote sensing satellites

In response to the lack of in-orbit image and vibration impact measurement methods for new rotary scanning satellites, this paper proposed a satellite imaging geometric simulation method based on 3D rendering engine. Simulated images that reflect strict object-image mapping and real-time dynamic image motion compensation process of TDI cameras are generated. On this basis, the consistency of peak signal-to-noise ratio (PSNR) and structural similarity (SSIM) in measuring vibration influence is analyzed, and a theoretical approximate solution for the sensitive frequency of sinusoidal vibration is obtained, which is inversely proportional to the number of rows of the image to be evaluated and the camera integration time. Finally, the correctness of the image motion compensation model is demonstrated through simulations under different working conditions, and the relative deviation between the experimental values of sensitive frequencies and theoretical results is within −15% to 20%.