General Relationship Research Articles

Influence of gyro axis sequence configuration on the accuracy of alignment and navigation in a nested rotation inertial navigation system

It is analyzed that for a nested rotation inertial navigation system (NRINS) constructed from three ring fiber optic gyros nested within each other the main residual errors after rotation modulation are gyro angle random walk (ARW) and non-modulated gyro drift. It is pointed out that different orientations of the gyro sensitive axis lead to different equivalent ARWs, and the non-modulated gyro drift caused by the nested installation of three ring gyros is also different. The mechanism of generation of non-modulated drift in the embedded system and the general relationship with the axis sequence configuration are expounded. The equivalent ARW and non-modulated gyro drift in the inner frame rotation modulation mode and their influence on the alignment and navigation of the system are analyzed and deduced. Finally, taking the two typical applications of short-time and long-time navigation as examples, the influence of different gyro axis sequence configuration schemes on the navigation accuracy of the NRINS is verified through static navigation experiments, and the best axis sequence configuration scheme under the two applications is determined. By optimizing the gyro axis sequence configuration, the accuracy of navigation can be improved by about two times, which is of great significance. This work has important reference value for further improving the accuracy of NRINS and maximizing the accuracy advantage of gyros in different applications.

Multi-site assessment of the potential of fine resolution red-edge vegetation indices for estimating gross primary production

Gross primary production (GPP) models driven by fine resolution remote sensing data characterize the spatial and temporal heterogeneities in plant photosynthesis, which is largely dependent on biome-specific maximum photosynthetic capacity. The red-edge reflectance, sensitive to leaf chlorophyll content, is a good proxy of maximum photosynthetic capacity. More importantly, studies show that the red-edge reflectance-related chlorophyll content index (CIr) multiplied by the incident photosynthetic active radiation (PARin) strongly correlates to GPP estimated at carbon flux towers (GPPflux). Yet, to the best of our knowledge, there is no systematic study investigating the general relationship between fine spatial resolution CIr and GPP among biomes and the relationship between CIr and maximum photosynthetic capacity in GPP models. To provide an overview on incorporating space-borne CIr into a GPP model, we applied fine resolution Sentinel-2-derived CIr and GPPflux over 57 flux sites representative of 10 biomes. We investigated the relationship between CIr and GPPflux, and the spatio-temporal relationship between CIr and ecosystem maximum photosynthetic capacity indicated by the potential ecosystem light use efficiency (LUEpot). We also evaluated the relationship between other five vegetation indices (VIs) and GPPflux. Results showed that the CIr multiplied by PARin has a higher agreement (R2 > 0.5) with GPP than other VIs. A universal relationship exists between the CIr multiplied by PARin and GPP, except for forest biomes. The CIr also strongly (R2 > 0.5) relates to the LUEpot during the peak of the growing season. The CIr has a low spatial variance (CV = 0.25) among biomes, highlighting that CIr can be a proxy of maximum photosynthetic capacity in GPP models that do not require biome-dependent coefficients. This study provides insight for incorporating CIr into GPP models and better quantifying global terrestrial photosynthesis.

Remembering for Relationships: Brief Cognitive-Reminiscence Therapy Improves Young Adults’ Perceptions About Self and Others in Social Relationships

Reminiscence-based interventions involve the guided recall and interpretation of autobiographical memories to promote adaptive thinking. This study involved secondary analyses of a recent trial of a positively focused, group-based, three-session version of cognitive-reminiscence therapy (CRT) on perceptions of general relationship quality and interpersonally related psychological resources in young adults. A community sample ( N = 62, Mage = 24.6 ( SD = 3.1), 71% identified as cisgender women and 29% identified as cisgender men) of young adults were randomised into a CRT and wait-list condition. Participants completed assessments measuring perceived general relationship quality (relationship satisfaction, emotional intimacy, commitment, and trust) and perceptions of self and others within relationships (relationship self-esteem, relationship self-efficacy, relationship optimism and meaning in relationships). The CRT group, relative to the control group, scored significantly higher on perceived relationship quality ( d = .62), and higher on generalized relationship self-efficacy ( d = .70), relationship self-esteem ( d = .59), and relationship optimism ( d = .57) at the follow-up. Group differences for relationship meaning were not statistically significant (small to moderate). A brief, positive-focused intervention of guided recall of autobiographical memories led to more adaptive perceptions about self and others within the context of relationships in young adults. Replication studies with larger samples are needed, and outside of a pandemic lockdown context. Future research may expand CRT to target other relationship variables, assess the impacts of different doses, explore relationships in specific populations, and better understand the mechanisms for change.

Diversity and determinants of recombination landscapes in flowering plants.

During meiosis, crossover rates are not randomly distributed along the chromosome and their location may have a strong impact on the functioning and evolution of the genome. To date, the broad diversity of recombination landscapes among plants has rarely been investigated and a formal comparative genomic approach is still needed to characterize and assess the determinants of recombination landscapes among species and chromosomes. We gathered genetic maps and genomes for 57 flowering plant species, corresponding to 665 chromosomes, for which we estimated large-scale recombination landscapes. We found that the number of crossover per chromosome spans a limited range (between one to five/six) whatever the genome size, and that there is no single relationship across species between genetic map length and chromosome size. Instead, we found a general relationship between the relative size of chromosomes and recombination rate, while the absolute length constrains the basal recombination rate for each species. At the chromosome level, we identified two main patterns (with a few exceptions) and we proposed a conceptual model explaining the broad-scale distribution of crossovers where both telomeres and centromeres play a role. These patterns correspond globally to the underlying gene distribution, which affects how efficiently genes are shuffled at meiosis. These results raised new questions not only on the evolution of recombination rates but also on their distribution along chromosomes.

On the role of chirality flips for the muon magnetic moment and its relation to the muon mass

The muon mass and the anomalous magnetic moment aμ are quantities which require chirality flips, i.e., transitions between left- and right-handed muons. Muon chirality flips are connected to electroweak symmetry breaking and Yukawa couplings. Scenarios for physics beyond the Standard Model motivated by the quest to understand electroweak symmetry breaking and/or the origin of flavour often introduce new sources of chirality flips; they hence provide potentially large contributions to aμ, and the current aμ measurement provides relevant constraints on such scenarios. This connection between aμ, chirality flips, and the muon mass generation mechanism is important and underlies much of the current research on aμ. The present article provides a brief pedagogical introduction to this role of chirality flips and an overview of general relationships. The general statements are illustrated with several concrete models involving e.g., leptoquarks and supersymmetry.

Towards a better understanding of linear species distribution in river valleys: The abundance of river corridor plants is linked to soil exchangeable potassium and pH

The phenomenon that some vascular plant species grow mainly or exclusively in the large river valleys of Central Europe constitutes a long-standing distribution puzzle. In our study, we focused on determining which physicochemical properties of soil affect the distribution of river corridor plant (RCP) species. Research that included RCP coverage, the physicochemical properties of soil as well as several topographic and spatial variables were conducted in 10 transects perpendicular to the San River (SE Poland). The sampled plots were located both in close proximity to the river, where the greatest number of RCP populations are concentrated, and along anthropogenic linear landscape elements which have proven to be important for RCP occurrence in areas located away from the riverbed. Spearman rank correlation matrices were constructed to observe the general relationships between particular variables and Boosted Regression Tree models were used for explaining RCP coverage. Our study indicated that in the case of plots located in proximity to the river, the expected coverage of RCP species was highest in plots characterized by a higher soil exchangeable potassium (K) content, as well as in those located closer to the San River and at lower altitudes. In plots situated along anthropogenic linear landscape elements, the expected coverage of RCPs was highest in plots with a high soil exchangeable K content and in those with a high soil pH. The analyses clearly showed that the physicochemical properties of soils indeed affect RCP species occurrence and they require soils with a high exchangeable K content and a high pH. Since these two soil parameters are closely related to soil fertility, and additionally K enhances root development, we suppose that both factors strengthen the competitiveness of RCPs in floodplain ecosystems.

Why did Putin go too far? The rationality of Vladimir Putin’s decision to begin a war with Ukraine

The paper aims to determine the extent of the rationality of Vladimir Putin’s decision to begin a war with Ukraine. Its central argument is that this decision was irrational on three levels. Firstly, the Russian decision-making elites failed to foresee the ability of the Ukrainian army and people to resist efficiently. It might have resulted from the imperial superiority syndrome reinforced by the experiences of 2014. Secondly, the elites treated the reports on the Russian army’s combat readiness as reliable and did not make an effort to verify them. Probably no one can determine the scale of the kleptocracy, and therefore no one has reliable data on the quality of the Russian army’s combat preparation. Thirdly, the elites failed to envisage the scale of support for Ukraine from Western democracies. What is more, they did not take into account the democratic rationality of Western politicians. The same politicians who appeared to Putin to be weak and incapable of action, immediately after the mass social protests and condemnation of Russia’s aggression by public opinion, acted following the clearly expressed will of the political nation. The article reflects on the systemic reasons for such a poor definition of the decision-making situation and then tries to formulate the general relationship between the quality of the decision-making elite and the acceleration of the bifurcation processes of the Russian autocratic regime.

Solid body calorimeter with one automatically regulated adiabatic jacket: Influence thermal and operated parameters on heat equivalent

The general model of solid body calorimeters (uniform solid body of arbitrary form) with one automatically operated adiabatic jacket was considered for the first time. The problem was to understand if there was general relationship between heat and temperature rise when calorimeter had essential temperature gradients and surrounded one automatically operated adiabatic jacket.It was shown that it was linear relation and proportionality coefficient (heat equivalent of calorimeter) did not depend on form of temperature dependence in main period but depend on (i) location of heat source; (ii) thermometer location; (iii) heat exchanging conditions and parameters of regulation. Experimental checking of theoretical considerations showed that under the same heat exchanging conditions and parameters of regulation, the heat equivalent of calorimeter for thermometer located on calorimeter surface differed from heat equivalent of calorimeter for thermometer located at radius r = 0.5 R by 0.2%.

Spatial Distribution, Potential Risks and Source Identification of Heavy Metals in the Coastal Sediments of the Northern Beibu Gulf, South China Sea.

Thirty samples of surface sediments (0–5 cm) from the northern Beibu Gulf were analyzed to determine the spatial distribution, potential risks and sources of six heavy metals (Cr, Cu, Zn, As, Cd and Pb). The concentrations (mg/kg, dw) of Cr, Cu, Zn, As, Cd and Pb were 15.38 ± 6.06, 6.54 ± 3.23, 41.86 ± 17.03, 6.92 ± 2.75, 0.04 ± 0.02 and 17.13 ± 6.38, respectively. Higher levels of Cr, Cu, Cd and Zn were observed in the western part of the study area. According to the potential ecological risk indexes and sediment quality guidelines, the measured metals were assessed at low contamination levels, with Pb posing the largest ecological risks. The results of positive matrix factorization (PMF) indicated that Cr and Zn mainly originated from natural geological background sources, while Cu, As, Cd and Pb were influenced by anthropogenic sources such as atmospheric deposition and anthropogenic activities. These three sources contributed 60.4%, 28.1% and 11.5% of the heavy metals, respectively. In addition, further research should be conducted focusing on the general relationships between As and various controls in sediments of the northern Beibu Gulf.

Morphological changes and dynamic mechanism of blowouts on fixed dunes in the Otingdag sandy land, China

<p indent="0mm">Blowouts are a major indicator of fixed dune reactivation, and their continuous occurrence and expansion aggravate the process of regional desertification. Therefore, research on the morphological evolution and dynamic processes of blowouts is paramount not only to understanding reactivation processes in stabilized and semistabilized dune fields but also to accurately assessing regional desertification trends. At present, much research has focused on blowouts in coastal dunes and flat grasslands, and little research has focused on the evolution mode of blowouts that have developed on fixed dunes in semiarid inland areas. Moreover, the morphological changes and airflow dynamics of blowouts are usually analyzed separately, and research integrating the two is still insufficient. In this paper, a fixed dune on the southern edge of the Otingdag sandy land was selected as the research object. A high precision real-time kinematic global positioning system (RTK-GPS) and 17 2D ultrasonic anemometers were used to measure the topography and airflow of four blowouts with different morphologies on the fixed dunes, and the multiperiod imaging data and multiyear meteorological data were used to monitor the morphological changes of each type of blowout and the regional meteorological conditions. The goal of this research is to reveal the morphological evolution, erosion-accumulation characteristics and airflow distribution patterns of each type of blowout and to discuss the relationship among the topography of fixed dunes, morphology of various blowouts and airflow variation. The results showed that the length, width and area of each type of blowout continued to increase from 2010 to 2021, and the overall shapes of each type of blowout tend to be oval or trough-shaped. The expansion direction of the blowout shape has a general corresponding relationship with the erosion-accumulation pattern in the deflation basin. The eastern and southeastern edges of the deflation basins are the most severely eroded, and their overall shapes expand from west to east. Relative to the wind direction of the field reference station, the approaching wind direction of the blowouts hardly deflects at the foot of the windward slope of the fixed dune, while it deflects significantly at the middle and top of the fixed dune, and the deflection angle changes with the regional wind direction. Both the blowout shapes and the approaching wind directions determine the airflow pattern within the blowouts. Based on a detailed analysis of both the regional climate and the morphological changes in blowouts, this study considered that the effect of the topography of fixed dunes on regional airflow could be the fundamental reason for the morphological differences in blowouts. The shape of blowouts determines the airflow pattern in the deflation basin, and the change in the wind speed and wind direction in turn affects the erosion-accumulation pattern and finally changes the evolution direction of blowouts. The research results can act as a good supplement for studying blowouts in semiarid inland areas.

Intra-habitat structural complexity drives the distribution of fish trait groups on coral reefs

Three-dimensional (3D) habitat complexity is a primary driver of organism distribution and community structure across ecosystems. Identifying the specific metrics and spatial scales at which complexity is functionally important for communities is therefore a critical component in forecasting ecosystem function. Here we pair fish species traits with multiple metrics from habitat photogrammetry to evaluate the most important measures and scales of 3D complexity driving ecological functions within one of the most structurally diverse ecosystems on the planet: coral reefs. From May to July 2019, we collected high-resolution (1 cm) large- and small-scale intra-habitat (25 m2) structural complexity data across eight reefscapes (∼2500 m2) and conducted co-located fish functional group surveys in the Florida Keys, FL, USA. We used a hierarchical clustering analysis to group 80 observed fish species by four traits related to habitat use (social level, body size, crypsis, activity period) and feeding guild to generate mechanistic predictions about fish-habitat relationships. Evaluating relationships between the resulting trait-based functional groups (k = 9) and four metrics of intra-habitat complexity (large-scale vertical relief, and small-scale vector ruggedness [VRM], VRM deviation, and profile curvature) revealed that trait groups respond independently to the various measures and scales of reef complexity. While large-scale complexity (relief) is strongly related to the presence of solitary, cryptic, nocturnal carnivores, likely due to prey availability as well as day-time refuge opportunities, herbivore abundance is unaffected by increasing vertical relief, potentially due to predator avoidance. Instead, gregarious (i.e., schooling) herbivores increase with small-scale complexity measured by VRM and VRM deviation across reefscapes, while less gregarious herbivores only respond to small-scale complexity when these same measures occur in low-relief habitat, possibly due to a tradeoff between grazing resource availability and predator visibility. Our results reveal how unique elements of complexity provided by both biotic benthic communities as well as large-scale habitat features like vertical relief are differentially important to fish functional groups. The general relationships we identified using traits provide a framework for predicting fish community responses to changes in specific measures of structural complexity on coral reefs globally. Our work illustrates how preserving 3D habitat complexity by protecting or augmenting (e.g., via restoration) structure-forming organisms can support diverse organismal communities and overall ecosystem productivity.

Analysis of the Impact of Changes in Echo Signal Parameters on the Uncertainty of Distance Measurements in p-ToF Laser Rangefinders.

The article presents results of research on the influence of changes in parameters of the digitally recorded echo signals on the uncertainty of pulsed Time-of-Flight (p-ToF) laser distance measurements. The main objective of the study was to evaluate the distance calculation method developed by the authors. This method is based on the acquisition of the full-waveform of the echo pulse signal and approximation of its shape by the second-degree polynomial (we called it SDPA for short). To determine the pulse transit time and measure the distance, the position of the vertex of this parabola is sought. This position represents the maximum intensity of the incoming echo signal and is related to the round-trip propagation time of the laser pulse. In the presented work, measurement uncertainty was evaluated using simulation tests for various parameters of the echo pulse. All obtained results were used to formulate the general relationship between the measurement uncertainty of the SDPA algorithm and the parameters of the received echo signals. This formula extends the base knowledge in the domain of laser p-ToF distance measurements. It can be used to estimate the measurement uncertainty of a FW LiDAR at an early design stage. This greatly improves capabilities of analysis of expected performance of the device. It can also be implemented directly into the rangefinder’s measurement algorithm to estimate the measurement uncertainty based on the emission of a single pulse rather than a series of pulses.

Is species richness mediated by functional and genetic divergence? A global analysis in birds.

Unravelling why species richness shows such dramatic spatial variation is an ongoing challenge. Common to many theories is that increasing species richness (e.g. with latitude) requires a compensatory trade-off on an axis of species' ecology. Spatial variation in species richness may also affect genetic diversity if large numbers of coexisting, related species result in smaller population sizes.Here, we test whether increasing species richness results in differential occupation of morphospace by the constituent species, or decreases species' genetic diversity. We test for two potential mechanisms of morphological accommodation: denser packing in ecomorphological space, and expansion of the space. We then test whether species differ in their nucleotide diversity depending on allopatry or sympatry with relatives, indicative of potential genetic consequences of coexistence that would reduce genetic diversity in sympatry. We ask these questions in a spatially explicit framework, using a global database of avian functional trait measurements in combination with >120,000 sequences downloaded from GenBank.We find that higher species richness within families is not systematically correlated with either packing in morphological space or overdispersion but, at the Class level, we find a general positive relationship between packing and species richness, but that points sampled in the tropics have comparatively greater packing than temperate ones relative to their species richness. We find limited evidence that geographical co-occurrence with closely related species or tropical distributions decreases nucleotide diversity of nuclear genes; however, this requires further analysis.Our results suggest that avian families can accumulate species regionally with minimal tradeoffs or cost, implying that external biotic factors do not limit species richness. Read the free Plain Language Summary for this article on the Journal blog.

Together–A couples’ program integrating relationship and financial education: A randomized controlled trial

The present study evaluated the effectiveness of the TOGETHER program through a randomized controlled trial. A sample of community couples, predominantly African-American and low-income, was randomly assigned to either a no-intervention control group ( N = 147) or the intervention group ( N = 145) that participated in the program consisting of a 20-hour integrated relationship and financial education workshop and referrals to community services for family needs. Both groups completed self-report instruments upon enrollment (T1), 8 weeks later (workshop end = T2), and 6 months later (T3) regarding general and financial individual coping and well-being, general and financial relationship functioning, and financial self-efficacy and management. Dyadic multilevel models controlling for demographic variables and baseline measurement of outcome variables were used to test T1 – T2, T2 – T3, and T1 – T3 mean differences. Improvements in the intervention group were statistically significantly different from the control group at 6-month follow-up in the following areas: Stress levels, use of positive individual and dyadic strategies to manage financial and non-financial stress, conflict management, relationship satisfaction and commitment, and budgeting. Considering the reciprocal influence of individual/relational emotional and financial aspects, TOGETHER may be a particularly useful relationship education program for financially distressed couples. However, given the absence of significant differences between the intervention and control groups in financial stress, financial shared goals and values, cash and credit management, and savings/investment, future studies should continue evaluating whether the financial literacy component of the program may have a positive impact in such outcomes. Limitations and implications are discussed.

Anchoring on Historical Round Number Reference Points

Buyers typically strive to negotiate low prices for durable goods. Psychologically-salient round number reference points (e.g., $10,000) influence these purchasing decisions. However, existing research does not capture how these historical reference points influence the anchoring effect of previous sales prices on future valuations. We argue that the anchoring effect of prior sales prices on subsequent prices is discontinuous at round numbers, such that it matters disproportionately whether a previous sales price reached a round-number threshold. Buyers paying a price just below a round number may sacrifice money because they receive disproportionately less when reselling the good. We further argue that while market forces are unlikely to attenuate this effect, highly-experienced professional intermediaries may. Using data on over 13,000 repeat real estate transactions, we find that home buyers who previously paid just under a $10,000 reference point subsequently list and sell their homes for about 1.3 percent (over $2000) less on average than do buyers selling comparable homes who previously paid at or above a round number threshold. This drop is observable controlling for home characteristics and the general relationship between previous and current prices. Buyers who cross a $10,000 threshold by paying $1000 more therefore would earn a return of 215%. An experiment with 1010 participants replicates these findings and increases confidence in causality. Market mechanisms, the negotiation process, and organizational support provided to intermediaries does not correct substantively for these discontinuities: Lower initial listing prices persist to final sales prices. However, using a highly-experienced agent attenuates intergenerational pricing bias.

Investigation of the process of molding, pressing and salting hard and soft cheeses

Modern man cannot imagine his diet without milk and dairy products, above all cheese. Uzbekistan has traditionally provided dairy products, including cheese, not only for itself but also for other neighbouring countries. Cheese has a long history and this naturally fermented dairy product contains a range of distinctive flavors. Microorganisms in variety cheeses are an essential component and play important roles during both cheese production and ripening. However, cheeses from different countries are still handmade, the processing technology is diverse, the microbial community structure is complex and the cheese flavor fluctuates greatly. Therefore, studying the general processing technology and relationship between microbial structure and flavor formation in cheese is the key to solving the unstable quality and standardized production of cheese flavor on basis of maintaining the flavor of cheese. Cheese processing, including cheese-making, cheese preparation and the different stages of cheese-making. Much attention is given to bacterial starters, bacteriophages, milk-forming enzymes used in cheese-making, and the production of new cheese varieties, including those in Uzbekistan. This paper reviews the research progress on the general processing moulding, pressing and salting points of natural cheese, the biochemical pathways for production of flavor compounds in cheeses, the diversity and the role of yeasts in cheese.

Internal or External CEO: Which Is Financially Sounder?

CEO origin and CEO compensation and their impact on firm financial performance have gained equally significant traction amongst strategy scholars and management practitioners. Research is unequivocal about externally headhunted CEOs being compensated higher than internally promoted CEOs; however, results are mixed on whether externally headhunted CEOs generate higher financial performance than internally promoted executives do. In this paper, we find that while external CEOs total compensation is higher than their internally promoted counterparts, their basic salary is not. We also find that the CEO origin moderates the relationship between total compensation and firm’s ROA in that internally promoted CEOs strengthen this positive relationship while externally headhunted CEOs weaken this relationship. Moreover, the firm size (small, medium, large) moderates the previous moderation. Firm size (small, medium, large) moderates the previous moderation relationship. The general moderated relationship is negative and significant for smaller and medium size, while it is positive but statistically insignificant for larger organizations. The effect of this moderated moderation relationship is stronger for internally promoted CEOs, while it is statistically insignificant for externally headhunted CEOs.

ReCF: Exploiting Response Reasoning for Correlation Filters in Real-Time UAV Tracking

Object tracking is a fundamental task for the visual perception system on the intelligent unmanned aerial vehicle (UAV). The high efficiency of correlation filter (CF) based trackers has advanced the widespread development of online UAV object tracking. This kind of method can effectively train a filter to discriminate the target from the background. However, most CF-based methods require a fixed label function over all the previous samples, leading to over-fitting and filter degradation, especially in complex drone scenarios. To address this problem, a novel adaptive response reasoning approach is proposed for CF learning. It can leverage temporal information in filter training and significantly promote the robustness of the tracker. Specifically, the proposed response reasoning method goes beyond the standard response consistency requirement and constructs an auxiliary label of the current sample. Besides, it helps learn a generic relationship between the previous and current filters, thereby realizing self-regulated filter updating and enhancing the discriminability of the filter. Extensive experiments on four well-known challenging UAV tracking benchmarks with 278 videos sequences show that the presented method yields superior results to 40 state-of-the-art trackers with real-time performance on a single CPU, which is suitable for UAV online tracking missions.

Sexual Assertiveness and Its Correlates in Emerging Adults: An Exploratory Study in Cuenca (Ecuador)

Objective: Sexual assertiveness (SA), i.e., the ability to communicate thoughts and desires that may be translated into satisfying sexual activity within an intimate relationship, is important for safe and satisfying sexual behavior. In an attempt to unravel which cultural, relational, and individual variables are related to the development of SA in emerging adults, an exploratory study was conducted in Cuenca, Ecuador. Methods: Five hundred and thirty-eight participants completed scales that measured their levels of SA, endorsement of the sexual double standard, relationship satisfaction, and mental well-being. Results: This study showed a negative effect of the sexual double standard on SA in both men and women and this effect was slightly tempered by the level of education. Women reported higher levels of SA than men. In women, SA was associated with general mental well-being and relationship satisfaction; but not in men. For both women and men, no association was found with relationship status or duration. Conclusions: These findings corroborate evidence highlighting the importance of SA for healthy sexual relationships and emphasize the importance of (sex) education for SA for lower educated women and men. The results are discussed in relation to findings on SA in other contexts.

Bharuch District, Gujarat, India: Factor analysis and geographical distribution of water quality characteristics

The goal of this study was to use statistical methods to create baseline data on uranium and associated physicochemical characteristics in the Bharuch district. The district is 6,527 km2 in size and is situated at 21.7051° N, 72.9959° E. Factor analysis is a crucial tool in statistical analytical approaches for obtaining general relationship between measured varaibles. For the study, 144 samples were collected from the Bharuch district of Gujarat during the pre-monsoon (PRMNS) and post-monsoon (POMNS) seasons. A portable multi-parameter water analysis tool was used to test in-situ water quality parameters on-site. In the laboratory, the uranium concentration and the other parameters were examined. Principle component analysis was performed on the data that led to reduction of 18 parameters to 6 during PRMNS and POMNS periods. The eigenvalue-extracted factor generated 86.01 percent and 86.017 percent variation in the PRMNS and POMNS, respectively.