Natural Form Research Articles

Economy of Nature as the Logic of Government

The aim of this paper is to show that Foucault’s genealogy of liberal governmentality necessitates reconsideration in light of the history of biology and its societal implications. In his lectures at the Collège de France in the late 1970s, Foucault argued that the natural growth of the market is what ultimately verifies or falsifies the excellence of liberal governmentality. Liberal governmentality recognizes the intimate correlation between the physical and social dimensions in order to adapt its political action to the natural processes of the market. It follows that liberal governmentality rests upon a certain kind of naturalism and the knowledge that defines this form of naturalism is political economy, which explicates both the foundations and the limits of governmental action in the name of the nature of the market. Foucault thus accords significant importance to the concept of nature in liberal governmentality. However, his genealogy is confined to an inquiry into the naturalism of classical political economy, without considering the economicism of the emerging biological sciences. To expand upon Foucault’s genealogy, the present paper focuses on the influence of political economy in the development of the theory of evolution by natural selection. The locution “economy of nature” is introduced to denote the discursive formation that brings together the naturalism of classical political economy and the economism of early evolutionary biology. This study contends that this construct played a critical role in shaping liberal governmentality.

I Am an Earphone and I Can Hear My User’s Face: Facial Landmark Tracking Using Smart Earphones

This article presents EARFace , a system that shows the feasibility of tracking facial landmarks for 3D facial reconstruction using in-ear acoustic sensors embedded within smart earphones. This enables a number of applications in the areas of facial expression tracking, user interfaces, AR/VR applications, affective computing, and accessibility, among others. Although conventional vision-based solutions break down under poor lighting and occlusions, and also suffer from privacy concerns, earphone platforms are robust to ambient conditions while being privacy-preserving. In contrast to prior work on earable platforms that perform outer-ear sensing for facial motion tracking, EARFace shows the feasibility of completely in-ear sensing with a natural earphone form factor, thus enhancing the comfort levels of wearing. The core intuition exploited by EARFace is that the shape of the ear canal changes due to the movement of facial muscles during facial motion. EARFace tracks the changes in shape of the ear canal by measuring ultrasonic channel frequency response of the inner ear, ultimately resulting in tracking of the facial motion. A transformer-based machine learning model is designed to exploit spectral and temporal relationships in the ultrasonic channel frequency response data to predict the facial landmarks of the user with an accuracy of 1.83 mm. Using these predicted landmarks, a 3D graphical model of the face that replicates the precise facial motion of the user is then reconstructed. Domain adaptation is further performed by adapting the weights of layers using a group-wise and differential learning rate. This decreases the training overhead in EARFace . The transformer-based machine learning model runs on smart phone devices with a processing latency of 13 ms and an overall low power consumption profile. Finally, usability studies indicate higher levels of comforts of wearing EARFace ’s earphone platform in comparison with alternative form factors.

Effectiveness of Salvadora persica toothbrush and Salvadora persica chewing stick in plaque and gingivitis control: a randomized control trial

BackgroundThe values of plant-based products have taken on an expanding relevance in dentistry. Salvadora persica chewing stick (miswak) has been practiced for centuries and is recommended by the World Health Organization as a customary oral hygiene tool. The therapeutic effects of S. persica chewing stick are contributed by its mechanical cleansing action, active chemicals released, or the combination of these two actions. However, the S. persica chewing stick in its natural form can be difficult to maneuver in certain parts of the mouth. This concern has inspired the innovation of the S. persica toothbrush that is designed to merge the ease of use of a toothbrush with the beneficial natural properties of S. persica preserved in its bristle. The present study aimed to compare the clinical effectiveness between S. persica toothbrush, S. persica chewing stick and the standard toothbrush in plaque and gingivitis control.MethodsIn this single-blinded and parallel randomized controlled trial, 78 participants were randomly divided into three groups to either use (i) S. persica toothbrush (MTB); (ii) S. persica chewing stick (MCS); or (iii) standard toothbrush (STB) in a standardized manner for three weeks. Plaque Index (PI) and Periodontal Inflamed Surface Area (PISA) values, measuring plaque levels and severity of gingivitis, respectively, were evaluated at baseline, one- and three-week post-interventions.ResultsThe MCS group showed a significant improvement in the mean PISA values of the anterior teeth compared to the MTB and STB groups (MCS: from 16.35 ± 10.03 to 3.41 ± 1.14; MTB: from 25.20 ± 14.01 to 3.57 ± 1.19; STB: from 26.54 ± 8.64 to 6.17 ± 0.86; p < .050). All three groups reported significant improvements (p < .001) in the plaque levels and the severity of gingivitis from baseline to three weeks after the intervention.ConclusionsFollowing correct techniques, S. persica toothbrush and chewing sticks are as effective as the standard toothbrush in plaque control and gingival health, which represent the reputed anti-plaque and anti-gingivitis properties of S. persica.Trial registrationThis clinical trial was prospectively registered in ClinicalTrials.gov with registration NCT04650685 (25/11/2020).

Orman ağaçlarında görülen büyüme anormalileri ve faydalanma imkânları: (Bursa Orman Bölge Müdürlüğü örneği)

Odun üretimi ve ormanların bakımı, sürdürülebilirlik ve silvikültürel ihtiyaçlar dikkate alınarak, yapılmaktadır. Kaliteli tomruk üretimi için ise idare süresi sonuna kadar bu amaca yönelik müdahaleler yapılmaktadır. Bu amaç dışında kalan anormal oluşumlar ve büyüme şekilleri bakımlar esnasında elimine edilmekte ve doğal şekilleriyle sanayiye ulaşamamaktadır. Oysa mobilya sanayisinde ekonomik değeri oldukça yüksek birçok mobilya ve dekoratif eşya, anormal büyümeler gösteren ağaçlardan elde edilebilmektedir. Bu çalışmanın amacı, ormanlarımızdaki bazı ağaç türlerinde meydana gelen anormal oluşumları belirlemek, bu tür ağaç malzeme işleyen sektörü inceleyerek ekonomiye sağlayacağı katkıyı ortaya koymak ve farkındalık oluşturmaktır. Bu amaçla Bursa ve İnegöl Orman İşletme Müdürlükleri ve Uludağ Milli Parkında yapılan çalışmada büyüme anormalileri gösteren ağaçlar türler bazında örneklenmiştir. Bursa ve İnegöl Orman İşletme Müdürlüklerinde (OİM) satışa sunulan emval türleri incelenmiştir. Ayrıca bu tür masif ağaç işleyen işletmelerle yapılan anket çalışmaları ile sektörün durumu değerlendirilmiştir. Masif ağacın işlenmesi sonucu meydana gelen tasarım ürünler araştırılarak maliyet ve satış ortalamaları mukayese edilmiştir. Çalışma sonucunda büyüme anormalilerinin ağaç türlerine göre farklılaştığı ve en fazla anormalliğin çınarda, en az karaçamda olduğu görülmüştür. Bu oluşumların sektörce değerlendirildiğinde katma değeri çok yüksek ürünlere dönüştürülebileceği belirlenmiştir.

ДИНАМІЧНІ ВИПРОБУВАННЯ МОСТІВ ІМПУЛЬСНИМ НАВАНТАЖЕННЯМ

Introduction. This article deals with the practice of applying the method of dynamic testing of bridges, namely, modal control using impulse loading. The possibilities of this method for determining the technical condition of a bridge span structure by determining its natural characteristics: actual stiffness and parameters of natural vibration forms are shown. Problem Statement. The article is devoted to the problem of practical implementation of the latest theoretical developments in the field of diagnostics of the technical condition of road bridges by conducting full-scale dynamic tests. Purpose. The main purpose of the article is to demonstrate the effectiveness of dynamic impulse testing as a method for assessing the technical condition of bridges. The method involves the excitation of vibrations of bridge structures by means of pulse loads, recording the response of the structure and analyzing the data obtained. Materials and methods. The material for this article is the results of field tests of a curved overpass made of monolithic reinforced concrete located near Kyiv. The following research methods were used: information analysis, mathematical modeling, and general methods of theoretical research.

Associations between real-time, self-reported adolescent mental health and urban and architectural design concepts

ABSTRACT Urban environments influence mental health and development of younger populations. Around 50% of lifetime mental illnesses begin at or prior to the age of 14 years old, and global urbanization trends are forecasted to continue into the coming decades, making links between urban spaces and youth mental health especially important. Little extant research explores links between urban environments, and especially distinct urban design exposures, and adolescent (ages 9–17) mental health. This study uses on-site, ecological momentary assessment (i.e. real-time) surveys and adjusted linear mixed models to explore associations between adolescent (n = 70) mental health indicators and multiple pedestrian design and architecture concepts. Results indicated several significant associations. Notably, spaces high in complexity (visual richness), imageability (distinctiveness), and enclosure (room-like quality) tended to support positive affect. Additionally, mixed built-natural spaces scoring high in scale (pedestrian amenities) and complexity appeared to increase calmness and mitigate anxiousness, while biophilic architecture (nature in built design) seemed to support perceived restorativeness. Practice implications include recommendations for planners to consider implementing natural forms of enclosure (e.g. tall trees), imageability (e.g. natural landmarks), and/or complexity (e.g. variety of gardens/shrubs) in or around spaces frequented by adolescents (e.g. schoolyards) to promote psychological well-being, and design socially supportive environments.

Impaired face symmetry detection under alcohol, but no 'beer goggles' effect.

The 'beer goggles' phenomenon describes sexual attraction to individuals when alcohol intoxicated whom we would not desire when sober. One possible explanation of the effect is that alcohol impairs the detection of facial asymmetry, thus lowering the drinker's threshold for physical attraction. We therefore tested the hypotheses that higher breath alcohol drinkers would award more generous ratings of attractiveness to asymmetrical faces, and be poorer at discriminating bilateral facial asymmetry than less intoxicated counterparts. Ninety-nine male and female bar patrons rated 18 individual faces for attractiveness and symmetry. Each type of rating was given twice, once per face with an enhanced asymmetry and once again for each face in its natural form. Participants then judged which of two same-face versions (one normal, the other perfectly symmetrised) was more attractive and, in the final task, more symmetrical. Alcohol had no influence on attractiveness judgements but higher blood alcohol concentrations were associated with higher symmetry ratings. Furthermore, as predicted, heavily intoxicated individuals were less able to distinguish natural from perfectly symmetrised face versions than more sober drinkers. Findings therefore suggest alcohol impairs face asymmetry detection, but it seems that this perceptual distortion does not contribute to the 'beer goggles' phenomenon.

Способы художественной когниции поэтов американского постмодерна

The aim of the study is to identify the innovative methods of artistic cognition characteristic of poets in the postmodern era. The scientific novelty of the study lies in the fact that the author identifies such methods of artistic cognition as artistic fractal, chaotic thinking, cognition through linguistic structure and interaction with the reader, the functioning of which is considered based on the American language poetry of the late 20th century. The specific characteristics of the postmodern poets’ creative thinking, expressed in a special language of lyrical texts, are determined. As a result, it has been found that the chaotic nature of modern creative thinking is realized by such linguistic means as paradox, oxymoron, paronomasia, an extended metaphor, a semantic flow, a line break, etc. One of the forms of the chaotic nature as a method of artistic cognition are fractals, represented at the structural level as complex graphic systems. Cognition through linguistic structure is realized both at the lexical (paronomasia, metaphor, oxymoron, paradox) and the grammatical (a line break, violation of grammatical norms, use of graphic symbols and drawings) level. Interaction with the reader is carried out in the course of solving logical riddles represented by paradoxes.

The Effect of Diabetes on Implanted Dentures, A Systematic Review

Background: Dentures are removably inserted dental prosthetics that fill up tooth gaps. There are many types of dentures, including complete, partial and implant-supported dentures. As long-term supports for tooth replacements, dental implants have significantly changed the treatment philosophies of conventional prosthodontics. However, the success and durability of these prosthetic devices may be impacted if a person seeking denture implants has diabetes. Diabetes affects the body in many ways, including the mouth's oral health. Immediate dentures have many benefits, including better oral functions, preservation of lower facial height, preservation of tooth sockets, improvement of aesthetics, and replication of natural teeth's shape, form, and location by artificial teeth. Diabetes mellitus has been reported to be associated strongly with the oral health. The higher glucose microenvironment prolongs healing of tooth extraction sockets. Thus, encouraging the healing of tooth extraction sockets is crucial from a therapeutic perspective for people with diabetes mellitus. Methods: An electronic search of English peer-reviewed dental literature on PubMed, Science Direct and Google Scholar was conducted to identify all publications reporting on how diabetes affect dentures until August 2023. Overall, 977 publications were found through an electronic and manual search, out of which 130 articles were selected after screening based on title and abstract. A total of 52 publications passed the second review phase after assessment for eligibility, from which 24 studies were excluded after full-text screening. Finally, a total of 28 studies were selected. A total of 10 articles were found to match our eligibility criteria to the full and were included in the final systematic review. Conclusion: Diabetes negatively impacts implanted dentures' success and longevity, leading to complications like Candida infection, poor bone integration, peri-implantitis, and compromised healing. Larger clinical trials are needed to understand diabetes's impact on implant therapy outcomes. Clinicians should assess patients' overall health, monitor glycemic control, maintain oral hygiene, and perform regular maintenance for optimal outcomes.

Challenges at the Educational Level in the Teaching and Training of Generation “Z”

Abstract This article aims to show how Generation Z, referred to as ‘digital natives’, see technology as inextricably linked to their existence, having grown up in the midst of the technological revolution. The article also highlights that this generation values self-directed learning, creativity and adaptability, utilising online resources, social media and visual language as natural forms of expression. Their proactive attitude also extends to entrepreneurship and embodies a do-it-yourself ethos, making them unique individuals who are constantly striving to improve themselves and acquire new skills. The study also seeks to highlight that most educators, especially those with some experience in the teaching profession, seek to adapt and update their teaching strategies because they are aware that technology can be used as a tool to increase learner engagement and improve learning outcomes.

A Smart Device with Hand Gesture using Webcam

Abstract: Over time, Human-Computer Interaction (HCI) has experienced tremendous growth. An entirely new era in the AI domain of human-computer interaction was ushered in by hand gesture recognition technologies. One of the easiest and most natural forms of communication is hand gestures. It might be challenging for novice With hand gestures, the user can control cursor functions on the system. The input device for the suggested system is a camera. this application, HCI deployment for educational purposes will enter a completely new age.

Analisis Image Processing pada Prasasti Teroksidasi Ayam Téas I

The Ayam Téas I inscription is one of the ancient inscriptions in Indonesia. Currently, the condition of the inscription has undergone natural degradation, causing the letters and the written message to become more difficult to read. Among the natural forms of degradation are corrosion and erosion. One method that can be used to address this problem is by utilizing image processing technology in the form of imageJ software. The analysis process involves capturing images using a camera and then processing the images using imageJ software. This software provides a mode that can remove unnecessary colors due to lighting, allowing some of the writings on the Ayam Téas I inscription to become more visible. Keywords: imageJ; prasasti; Ayam Téas I; histogram; grayscale

How bio-inspired solutions have influenced the built environment design in hot and humid climates

The rapid increase in the population, which has been concentrated mainly in urban areas, has caused an environmental imbalance over the years since the built environment developed as a foreign element to the ecosystem, which prevents having resilient environments capable of adapting to the challenges posed by climate change. This research aims to provide an updated knowledge base of bio-inspired strategies emulated in hot and humid climates to achieve an efficient built environment, restoring resources, and bringing nature closer to cities. A systematic review is conducted based on keyword selection to answer i) what has been achieved in built environments to be more efficient and sustainable (including tropical climates) and ii) how natural patterns, strategies, and models are mimicked. Implementing these strategies is very little in regions with hot and humid climates. Bio-inspired approaches are concentrated in those that try to emulate the functions of nature, followed by approaches that imitate the form of nature, biomimicry, and biomimetics being the most used approaches, leading to the development of efficient and resilient cities.

Choice of the shape imperfections model in dynamics problems of a long flexible cylindrical shell subjected to force couples

The issue of modeling geometrical imperfections in the dynamics problems of thin-walled shells was little researched. In cases when the natural modes of shell coincided with its buckling modes, the issue of choosing a dangerous imperfection model did not arise. When these shell modes did not coincide, it was important to investigate and compare the effect of different imperfections models on the static and dynamic characteristics of such shells. The choosing the shape imperfections model of a long flexible cylindrical shell subjected to force couples, the natural and buckling modes of which did not coincide, was studied using procedures of the finite element analysis software NASTRAN. The shell wall as a set of plat rectangular elements with six degrees of freedom at the node in the cylindrical coordinate system was modeled. The action of force couples as the concentrated forces were distributed at the nodes of the shell edges in accordance to the presentation of A.S. Volmir. The linear buckling problem and the geometrical nonlinear static analysis of the perfect shell by the Lanzosh method and the Newton-Raphson one were performed, respectively. The long half-waves buckling mode was taken as the first shell imperfections model. The modeling of the second shape imperfections as the first natural mode of the perfect shell using the natural vibration analysis by the Lanzosh method was performed. The different amplitudes of geometrical imperfections in proportion to the shell thickness using a program adapted to this software were set. The results of the geometrical nonlinear static analysis of the imperfect shell by the Newton-Raphson method showed that the shape imperfection model in the form of long half-waves more reduced the values of critical buckling loads. Investigations of natural shell vibrations by the Lanzosh method revealed the same influence of different imperfections models on the natural frequencies and natural forms. We think that the shape imperfections model in the form of long half-waves in studies of forced vibrations and dynamic stability of a long flexible cylindrical shell subjected to force couples will be more effective.

Entanglement entropy from form factors in textrm{T}overline{textrm{T}} -deformed integrable quantum field theories

In two recent papers [1, 2] we have proposed a program of study which allows us to compute the correlation functions of local and semi-local fields in generalised textrm{T}overline{textrm{T}} -deformed integrable quantum field theories. This new program, based on the construction of form factors, opens many avenues for future study, one of which we address in this paper: computing entanglement measures employing branch point twist fields. Indeed, over the past 15 years, this has become one the leading methods for the computation of entanglement measures, both in conformal field theory and integrable quantum field theory. Thus the generalisation of this program to textrm{T}overline{textrm{T}} -perturbed theories offers a promising new tool for the study of entanglement measures in the presence of irrelevant perturbations. In this paper, we show that the natural two-particle form factor solution for branch point twist fields in replica theories with diagonal scattering admits a simple generalisation to a solution for textrm{T}overline{textrm{T}} -perturbed theories. Starting with this solution, some of the known properties of entanglement measures in massive integrable quantum field theories can be generalised to the perturbed models. We show this by focusing on the Ising field theory. During the completion of this paper, we became aware of the recent publication [3] where the same problem has been addressed.

ZERO-INFLATED POISSON TRANSMUTED WEIGHTED EXPONENTIAL DISTRIBUTION: PROPERTIES AND APPLICATIONS

Count observations with high frequencies of zero counts abound in diverse fields. In actuary science, for example, insurance claims are often underreported, leading to a higher frequency of zero counts. This invariably reduces the mean and leads to over-dispersion. Different techniques to model such occurrences exist. This study uses the cubic rank transmutation map to compound the weighted exponential distribution and obtain a new count distribution in the mixed Poisson paradigm. The zero-inflated form of the proposition is obtained along with some mathematical properties. Simulated skewness, kurtosis, and dispersion index for the new distributions reveal they are suitable for model dispersed observation with positive skewness. Five datasets with high frequencies of zero counts are used to assess the performance of the new distribution along with some popular count distributions by using the maximum likelihood for parameter estimation. Results show that the natural form of the new proposition performs creditably better than its zero-inflated forms, even when there is a higher proportion of zero counts. The classical negative binomial distribution is also observed to outperform its zero-inflated form in most cases. In contrast, the zero-inflated Poisson distribution better fits the datasets than the classical Poisson distribution.

Use of Electrolysis to Produce H2 from Natural and Modified Water

Hydrogen, as an energy carrier, cannot be found in its pure form in nature and must be generated through specific processes to be stored and utilized. The primary methods of producing hydrogen involve electrolyzing water or reforming and gasifying hydrocarbons. Herein, the nature of El‐Oued water on the production of hydrogen by the electrolysis process is investigated experimentally. The experimental work is divided into three parts: 1) the first one of 250 mL of distilled water and potassium oxide (KOH) of (1 mol L−1); 2) the second part of 250 mL of El‐Oued water and potassium oxide (KOH) of (1 mol L−1); and 3) the thrid part of 250 mL of El‐Oued water. The amounts of the produced hydrogen in these scenarios are measured and compared in controlled times. The results insured that the use of El‐Oued water only gives a very few amounts of hydrogen gas in the electrolysis of water. Moreover, distilled water can be replaced by El‐Oued water to produce hydrogen with the same amount of potassium oxide (KOH).

Seasonal changes in the fatty acid profile of Kyrgyz khainak milk

Khainak milk is a traditional source of nutrition for people living in the highlands of Kyrgyzstan. It is consumed both in its natural form and in the form of butter, cheese, and cottage cheese. We aimed to determine the composition of fatty acids in khainak milk, as well as its seasonal changes, since such data is lacking in literature.&#x0D; Fatty acids were determined by gas chromatography qualitatively and quantitatively in the milk from five lactating khainaks farm-bred in the Issyk-Kul region. The milk samples were collected and analyzed in the spring, summer, autumn, and winter seasons over three years (2019, 2020, and 2021). &#x0D; Kyrgyz khainak milk fat was mostly represented by saturated fatty acids, with a maximum content of 73.10 ± 2.19 g/100 g in winter. C14:0, C16:0, and C18:0 dominated in their composition, exceeding 5 g/100 g, with C16:0 (palmitic acid) reaching almost 35 g/100 g in winter. The flora of mountain pastures favorably contributed to monounsaturated fatty acids in khainak milk, especially oleic acid, whose content reached 26.85 ± 0.81 g/100 g in spring and then gradually declined to 18.90 ± 0.56 g/100 g, following changes in vegetation. Polyunsaturated fatty acids were found in small quantities varying from 3.25 ± 0.09 g/100 g in winter to 4.28 ± 0.12 g/100 g in summer.&#x0D; The seasonal changes in the fatty acid profile of Kyrgyz khainak milk are most likely due to differences in the animals’ diet. Our data can be used to optimize the process parameters for the production of full-fat products from khainak milk (cheese, butter, sour cream, etc.).

A Study on the Characteristics and the Meaning of the 'baoxianghua' Patterns in the Dun Huang Murals, China

The study explores the distinctive 'baoxianghua' designs intrinsic to the art of China's Tang Dynasty. Unlike typical Chinese patterns that usually replicate specific natural forms or shapes, the 'baoxianghua' patterns depict an idealized plant emblem that carried significant symbolic weight in the Tang period. The main goal of this project is to investigate the unique characteristics and significances of the 'baoxianghua' motifs during the four stages of the Tang Dynasty, with a specific focus on the Dun Huang frescoes. The research aims to unravel and examine the relationships between the features and symbolic components of the 'baoxianghua' patterns in these works of art, laying the groundwork for further scholarly discussion. The methodology selected for this study is a qualitative approach with a strong emphasis on visual investigation. This study employs analysis to investigate the 'baoxianghua' motifs across various phases of the Tang Dynasty as depicted in the Dun Huang frescoes. Furthermore, it involves iconographic analysis of images and text, conducted to unravel metaphors and symbols ingrained in these motifs. Principally, this research underscores the uniqueness of the 'baoxianghua' motif in classical Chinese art, emphasizing its absence of literal natural correspondences and its deep-rooted cultural and symbolic significance within the context of the Tang Dynasty. The research strives to provide extensive theoretical insight into these motifs, particularly in the context of the Dun Huang frescoes, using a qualitative method and a technique of visual analysis.

Evaluation of the productivity of male sterile forms of sugar beet depending of different structure and genetic origin

The article summarizes the experimental data of three-year research on the creation of new pollen-sterile forms for heterosis sugar beet hybrids. The breeding process of creating high-performance hybrids requires new components with improved characteristics. It was found out that the initial CMS forms of different genetic nature, when crossed with sterility maintainers of other ecological and genetic origin, differ significantly in terms of yield with fluctuating indicators in the range of 47.9–62.5 t/ha and sugar content ranging from 16.01 to 19.93%, combining the manifestation of these signs in different ways, which significantly expands the range of variability in terms of productivity componrnts. The average productivity indicators of monogerm CMS lines in the form of simple sterile hybrids, regardless of the origin of their sterility maintainers, had higher sugar yield performance compared to pollen-sterile linear-type forms obtained by backcrossing. Variation of the quantitative traits in simple sterile hybrids had a significantly greater amplitude of oscillations compared to CMS lines. The best simple sterile hybrids in terms of yield were 720/Ot4 and 730/Ot4 with the yield of 63.6 and 62.1 t/ha, respectively, and in terms of sugar content — 730/Ot4 (19.3%) and 730/Ot5 (19.5%). They will be introduced in the breeding process for hybridization with multigerm pollinators.