Displacement Type Research Articles

Evaluation of condylar surface CT values related to condylar height reduction after orthognathic surgery

This study was performed to evaluate the relationship between condylar height reduction and changes in condylar surface computed tomography (CT) values in jaw deformity patients following orthognathic surgery.Mandibular advancement by sagittal split ramus osteotomy (SSRO) with Le Fort I osteotomy was performed in class II patients, and mandibular setback by SSRO with Le Fort I osteotomy was performed in class III patients. The maximum CT values (pixel values) at five points on the condylar surface and the condylar height, ramus height, condylar square, ramus angle, and gonial angle in the sagittal plane were measured preoperatively and 1 year postoperatively. Disc position was classified as anterior disc displacement (ADD) or other types by using magnetic resonance imaging (MRI).Ninety-two condyles of 46 female patients were prepared for this study. Their temporomandibular joints (TMJs) were divided into two groups based on class (46 joints in class II and 46 joints in class III) and two groups based on the findings (25 joints with ADD and 67 joints with other findings). ADD with and without reduction was observed in two joints in the class III group and in 23 joints in the class II group. The distribution of ADD incidence had not changed 1 year after surgery. Condylar height decreased 1 year after surgery in both class II patients (mandibular advancement) (p < 0.0001) and class III patients (mandibular setback) (p = 0.0306). Similarly, condylar height decreased 1 year after surgery both in patients who showed ADD (p = 0.0087) and those with other types (p = 0.0023). Significant postoperative increases at all angle sites on the condylar surface were found in the class II (p < 0.05) and ADD (p < 0.05) groups.This study showed that an enhanced condylar surface CT value might be one sign of condylar height reduction related to sequential condylar resorption, in combination with ADD.

Floating platform effects on power generation in spar and semisubmersible wind turbines

AbstractThe design and financing of commercial‐scale floating offshore wind projects require a better understanding of how power generation differs between newer floating turbines and well‐established fixed‐bottom turbines. In floating turbines, platform mobility causes additional rotor motion that can change the time‐averaged power generation. In this work, OpenFAST simulations examine the power generated by the National Renewable Energy Laboratory's 5‐MW reference turbine mounted on the OC3‐UMaine spar and OC4‐DeepCWind semisubmersible floating platforms, subjected to extreme irregular waves and below‐rated turbulent inflow wind from large‐eddy simulations of a neutral atmospheric boundary layer. For these below‐rated conditions, average power generation in floating turbines is most affected by two types of turbine displacements: an average rotor pitch angle that reduces power, caused by platform pitch; and rotor motion upwind‐downwind that increases power, caused by platform surge and pitch. The relative balance between these two effects determines whether a floating platform causes power gains or losses compared to a fixed‐bottom turbine; for example, the spar creates modest (3.1%–4.5%) power gains, whereas the semisubmersible creates insignificant (0.1%–0.2%) power gains for the simulated conditions. Furthermore, platform surge and pitch motions must be analyzed concurrently to fully capture power generation in floating turbines, which is not yet universal practice. Finally, a simple analytical model for predicting average power in floating turbines under below‐rated wind speeds is proposed, incorporating effects from both the time‐averaged pitch displacement and the dynamic upwind‐downwind displacements.

A general framework of higher-order shear deformation theories with a novel unified plate model for composite laminated and FGM plates

A novel unified framework of higher-order shear deformation theories is developed for modeling and analysis of laminated and functionally graded plates. The major objective of this study is to (1) unify all higher-order shear deformation plate theories in a unique formulation; (2) propose a new higher-order shear deformation model based on the unified plate model. In this study, the existing displacement fields in the equivalent single layer theories are classified into three categories based on the present unified method. Some of the existing equivalent single-layer plate theories are unified according to different types of transverse displacements and transverse shear strains based on the present method and several new plate theories are proposed and assessed. The Reddy shear strain function and a changeable shear function proposed by Li et al. are applied to represent the distribution of transverse shear strains through the thickness of composite laminated and FGM plates, respectively. One of the new higher-order shear deformation theory is then ascertained by comparing the obtained bending, free vibration and buckling results of composite laminated and FGM plates with other published ones. The results show that the unified plate model can theoretically cover all existing equivalent single-layer models and is able to encourage interested readers to search for more feasible and accurate plate theories.

Pore-network modeling and determination of rock and two-phase fluid flow properties

Pore-scale modeling is becoming widely applied in the oil industry. The objective of pore-scale imaging and modeling is to predict the properties of multiphase flow in porous media. Pore-network model construction of geologically realistic samples and determination of rock and two-phase fluid flow properties are described and discussed in this paper. Pore-network models were constructed using published micro-computed tomography images of different rock samples. Effective porosity, average absolute permeability, capillary pressure, tortuosity (in 3 directions), and relative permeability were calculated for 2 types of displacement (drainage and imbibition). Avizo® Software and two-phase code were used for volume rendering of rock samples and calculations of rock and two-phase fluid flow properties, since it is a valuable and reliable tool for prediction of petrophysical properties and has advances in visualization of the pore space. Created 3D models of core samples based on micro-computed tomography scan data will allow oil and oilfield service companies to create a digital core database on a computer instead of storing physical cores in warehouses, which in turn greatly facilitates access to cores for further work with them.

A comparative study of functional outcome of type 2 and 3 radial head fracture treated with radial head excision versus radial head fixation

Background: This study was conducted to compare the results of radial head excision versus radial head open reduction and fixation in Type 2 and Type 3 Mason fracture of radial head using Quick Dash scoring system. This study suggested better Quick Dash score was associated with radial head fixation as compared to radial head excision.Methods: Out of 40 participants who underwent surgery for Type 2 and 3 Mason radial head head fracture, 20 patients had undergone radial head excision and 20 patients had undergone open reduction and internal fixation. Patients were followed up post-operatively upto 6 months and were evaluated on the basis of Quick Dash scoring system.Results: Out of 40 patients, 27 were males and 13 were females. The Mean age group of this study population was 38.8 years with SD of 12.5 years. Even though, the elbow range of motion was comparable between two groups, those who had undergone radial head excision had an average score of 52.5% where bas those who had undergone radial had fixation had an average score of 60%.additionally patients those who had undergone radial head excision had complaints of elbow instability.Conclusion: Mason Type 2 stable, displaced fractures can be treated satisfactorily with radial head excision, but in the presence of ligamentous injury, there are likely chances of elbow instability and patient may require long term use of orthosis whereas unstable, displaced type 2 Mason fracture and Type 3 communited fracture are better treated with open reduction and internal fixation with either k-wires, screws or plates with fewer complications.

НЕКОТОРЫЕ ЛИНЕЙНЫЕ ПРОМЕРЫ ПЧЁЛ, ОБИТАЮЩИХ В ОКРЕСТНОСТЯХ ГОРОДА БАРНАУЛА АЛТАЙСКОГО КРАЯ

The indices used in determining bee breeds were stud-ied: wing size and abdominal tergite 3 width; the metatar-sus of the right hind leg was measured to determine the tarsal index. The percentage of individuals with different variants of discoidal displacement (positive, negative, neu-tral) was determined. The data of morphometric measure-ments of bees of 3 colonies are presented. The wing indi-ces in the 1st group of bees were slightly lower thanthe standard values (8.81-9.21; 3.01-3.23 mm). In the 2nd and 3rd bee colonies, the wing length was the same as in the European darkand Carpathian populations in 15% and 25% of individuals. A certain number of insects (15; 25; 60%) had a wing width equalto the European darkand Italian races. The studied bees had the sizes of the third abdominal tergite (4.88 ± 0.030; 4.92 ± 0.030; 4.97 ± 0.033 mm) as in all major breeds kept in the Russian Fed-eration. The tarsal index values (60.43 ± 0.452; 58.62 ± 0.445; 57.08 ± 0.322%) did not fit within the standards of the main bee breeds (54.0-56.2%). There was yellow color of the third tergite (35%; 80%) and all types of discoidal displacement (+; -; 0) in the insects of the 1st and 2nd col-onies. In the 3rd bee colony, the yellowness of the ab-dominal tergites lacked completely, and the positive dis-coidal displacement made 80%. In 3 studied groups of bees, the coefficient of variability was at the level of 1-4% for all indices. Thus, the research revealed the insectswith the signs of the European dark, Carniolan, Carpathian, Italian and Caucasian breeds.

Occurrence and remission of loss of sensitivity of inferior alveolar nerve in mandibular fractures

Purpose: to evaluate the occurrence of loss of sensitivity of the inferior alveolar nerve, and to monitor the remission of this change in patients with mandibular fractures subjected to surgical treatment. Methods: patients with mandibular fractures, surgically treated within one year, were prospectively evaluated. Data regarding etiology, fracture location, type and displacement, and surgical access, were obtained. The tactile and thermal tests were applied at eighteen points in the mental region, within a period of six months. Statistical tests were applied to compare the categories of variables and the period of observation (p ≤ 0.050). Results: during the study, 37 patients were included. There were 24 bilateral and 13 unilateral fractures. Sensory changes occurred in 56.8% of the patients in the preoperative period, in 83.8% of the patients, in the postoperative period, and 35.1% of the patients presented complete remission during the final period of the study. Conclusion: sensory changes occurred in about half of the patients, due to the fracture, increasing greatly in the postoperative period, with complete remission in about one third of the cases. The fracture type, degree of displacement and surgical access type influenced the occurrence of sensory alterations.

Free vibration analysis of open-cell FG porous beams: analytical, numerical and ANN approaches

This paper constitutes an attempt to explore the influence of porosity on free vibration analysis of functionally graded (FG) beams with different boundary conditions using different efficient analytical and numerical approaches. The material properties of open-cell FG porous beams are estimated using a modified power-law with two different types of porosity distributions through the thickness direction of the FG beam namely even and non-even distributions. Hamilton's principle is used to derive the equations of motion of the FG porous beam with high-order shear deformation theory. The state-space approach is utilized to solve the problem in the analytical solution section. In addition to the theoretical solution, a simulation based on a displacement type of finite element method (FEM) was utilized to verify the analytical solution. For this purpose, three-dimensional shell beams were modeled using ABAQUS for the solution of the vibration problem of the FG porous beam. Furthermore, the Artificial Neural Networks (ANNs) technique is used to predict the effects of porosity distributions, porosity coefficient, slenderness ratio and boundary conditions on natural frequency variations of porous FG beam. The ANNs technique allows for an investigation of the effects of various parameters, including beam characteristics, material properties, geometric details and porosity distributions.

Metode određivanja brzine strujanja vode u kanalima u cilju zaštite kosina i dna kanala od rušenja

The paper analyzes the navigating conditions of the displacement type ships for the transport of our shipping companies on the channels of the Danube-Tisa-Danube hydro system in order to determine the navigation speed at which the speeds of water flow of opposite direction occur so that the channel banks and the bottom are protected from collapse. The methods applied in the work were created as a result of special research conducted on the Moscow and Volga-Don channels by two scientific institutions of the Russian Federation: the Main Research Institute of Water Transport (GIIVT) and the Scientific Research Institute of Water Transport (NIIVT). The results of this research have been published in literature in the Russian language. The aim of the authors was, based on these published methods, to examine and determine the impact of the movement of ships of our shipping companies on the shores and bottom of the canal as a new step in preparations for finding the optimal regime of navigation on navigable canals. Self-propelled (motor) ships for the transport of cargo of different types in channels of variable cross-sectional area and at different navigation speeds were subjected to calculations.

Surgical Treatment and Visual Outcomes of Adult Orbital Roof Fractures.

Fractures of the orbital roof require high-energy trauma and have been linked to high rates of neurologic and ocular complications. However, there is a paucity of literature exploring the association between injury, management, and visual prognosis. The authors performed a 3-year retrospective review of orbital roof fracture admissions to a Level I trauma center. Fracture displacement, comminution, and frontobasal type were ascertained from computed tomographic images. Pretreatment characteristics of operative orbital roof fractures were compared to those of nonoperative fractures. Risk factors for ophthalmologic complications were assessed using univariable/multivariable regression analyses. In total, 225 patients fulfilled the inclusion criteria. Fractures were most commonly nondisplaced [n = 118 (52.4 percent)] and/or of type II frontobasal pattern (linear vault involving) [n = 100 (48.5 percent)]. Eight patients underwent open reduction and internal fixation of their orbital roof fractures (14.0 percent of displaced fractures). All repairs took place within 10 days from injury. Traumatic optic neuropathy [n = 19 (12.3 percent)] and retrobulbar hematoma [n = 11 (7.1 percent)] were the most common ophthalmologic complications, and led to long-term visual impairment in 51.6 percent of cases. Most orbital roof fractures can be managed conservatively, with no patients in this cohort incurring long-term fracture-related complications or returning for secondary treatment. Early fracture treatment is safe and may be beneficial in patients with vertical dysmotility, globe malposition, and/or a defect surface area larger than 4 cm2. Ophthalmologic prognosis is generally favorable; however, traumatic optic neuropathy is major cause of worse visual outcome in this population. Risk, III.

Low-profile double plating of unstable osteoporotic olecranon fractures: a biomechanical comparative study

In the treatment of unstable olecranon fractures, anatomically preshaped locking plates exhibit superior biomechanical results compared with tension band wiring. However, posterior plating (PP) still is accompanied by high rates of plate removal because of soft-tissue irritation and discomfort. Meanwhile, low-profile plates precontoured for collateral double plating (DP) are available and enable muscular soft-tissue coverage combined with angular-stable fixation. The goal of this study was to biomechanically compare PP with collateral DP for osteosynthesis of unstable osteoporotic fractures. A comminuted displaced Mayo type IIB fracture was created in 8 osteoporotic pairs of fresh-frozen human cadaveric elbows. Pair-wise angular stable fixation was performed by either collateral DP or PP. Biomechanical testing was conducted as a pulling force to the triceps tendon in 90° of elbow flexion. Cyclical load changes between 10 and 300 N were applied at 4 Hz for 50,000 cycles. Afterward, the maximum load was raised by 0.02 N/cycle until construct failure, which was defined as displacement > 2 mm. Besides failure cycles and failure loads, modes of failure were analyzed. Following DP, a median endurance of 65,370 cycles (range, 2-83,121 cycles) was recorded, which showed no significant difference compared with PP, with 69,311 cycles (range, 150-81,938 cycles) (P = .263). Failure load showed comparable results as well, with 601 N (range, 300-949 N) after DP and 663 N (range, 300-933 N) after PP (P = .237). All PP constructs and 3 of 8 DP constructs failed by proximal fragment cutout, whereas 5 of 8 DP constructs failed by bony triceps avulsion. Angular-stable DP showed comparable biomechanical stability to PP in unstable osteoporotic olecranon fractures under high-cycle loading conditions. Failure due to bony triceps avulsion following DP requires further clinical and biomechanical investigation, for example, on suture augmentation or different screw configurations.

Comminuted Mandibular Fractures in a Pediatric Patient: A Case Report with Review

Background and Introduction:Maxillofacial fractures are less common in children. Mandibular fractures are less in children because of the protective anatomy in them. Management of the pediatric fracture depends on the type and severity of the fracture displacement. It can vary from conservative management with acrylic splint and arch bar fixation to surgical exposure of the fracture site with internal fixation. Special consideration is needed in children for the interferences of growth and developing tooth buds while going for the surgical management. The hardware for internal fixation can be made up of either titanium or bioresorbable material.Case Presentation:Here is the presentation of a case of a 7-year-old male patient who had a history of trauma because of falling from a tractor while playing, 2 days back from reporting. He had multiple mandibular fractures with extensive soft tissue laceration. Following the emergency tracheostomy, he was managed with open reduction and internal fixation of the compound mandibular fracture.Conclusion:Displaced mandibular fractures require open reduction and internal fixation of the fractured fragments with either titanium or biodegradable hardware. Open reduction also shortens the period of intermaxillary fixation and hence reduces the possibility of the development of temporomandibular joint (TMJ) ankylosis.

‘An open secret’: Public housing and downward raiding in Rio de Janeiro

This article examines a case of urban displacement currently underway in central Rio de Janeiro, Brazil. In some respects, this case represents a classic example of what researchers call ‘downward raiding’: a type of urban displacement whereby low-income housing is exploited by higher-income groups. Yet, in other respects, it also raises important questions about the ways urban displacement happens in public housing, as well as how downward raiding operates on the ground in cities. By exploring these questions, this article aims to accomplish two goals: first, to investigate an overlooked and often hidden form of urban displacement that, in this case, coincides with a large-scale, public–private housing initiative; and, second, to critically interrogate the concept of downward raiding in order to better understand and define the process. It is argued that by placing greater emphasis on how, empirically speaking, urban displacement happens, researchers may gain new insight into diverse forms of urban displacement in cities around the world.

Validity and Reliability of a New Device to Measure Type of Actions in Indoor Sports.

The purpose of this study was to analyze the validity and the reliability of the intensity ranges, number of actions and changes of direction measured by a commercial inertial measurement unit. Eleven elite youth futsal players performed a circuit with different type of displacements as sprinting, running at low-medium intensity, standing up and changes of direction. Data recorded by the Overtraq system were compared with video-analyzer during the six trials of each player. Standard error mean, Intraclass Correlation Coeficient and Coefficient of variation, were calculated to analyze the reliability of the device, as well as the Root Mean Square Error and Confidence Interval with correlation of Pearson for its validity. The results reported good validity for three intensity ranges (R2>0.7) with high reliability (Intraclass Correlation Coeficient: 0.8-0.9), especially for high intensity actions (Intraclass Correlation Coeficient: 0.95, Coefficient of Variation: 3.06%). Furthermore, the validity for the number of different actions was almost perfect (96.3-100%), with only small differences regarding changes of activity (mean error: 2.0%). The Overtraq system can be considered as a valid and reliable technology for measuring and monitoring actions at different intensities and changes of direction in futsal, likewise common actions for other indoor sports.

Macroevolutionary patterns of body plan canalization in euarthropods

AbstractReconstructing patterns of macroevolution has become a central endeavor in paleobiology, because it offers insight into evolutionary models shaping the history of life. As the most diverse and abundant animals since the Cambrian period, arthropods provide copious data to elucidate the emergence of body plans in metazoan lineages. However, information provided by fossils on the tempo and mode of this phenomenon has lacked a recent synthesis. Here, I investigate macroevolutionary patterns of morphological evolution in Euarthropoda using a combined extinct and extant dataset optimized for multivariate analyses. Overall ordination patterns between the main morphogroups are consistent with another, independently coded, extant-only dataset providing molecular and morphological rates of evolution. Based on a “deep split” phylogenetic framework, total-group Mandibulata and Arachnomorpha emerge as directional morphoanatomical lineages, with basal fossil morphogroups showing heterogeneously spread-out occupations of the morphospace. In addition to a more homogeneous morphological variation, new morphogroups arose by successive reductions of translation distances; this pattern was interrupted only by terrestrialization events and the origin of pancrustaceans. A displaced optimum type of model is proposed to explain the fast assembly of canalized body plans during the Cambrian, with basal fossil morphogroups fitting intermediate fitness peaks in a moving adaptive landscape. Given time constraints imposed by the paleontological evidence, and owing to the interplay between canalization and modularity, as well as a decoupling between molecular and morphological rates, the rise of euarthropods would support the view that the swiftness of the Cambrian explosion was mostly associated with the buildup of genetic regulatory networks.

The novel boundary integral equation with adaptive orthogonal IMLS based line integration method for cracked domains under thermal stress

For finite cracked domain under unknown thermal field distribution, based on the direct boundary element method (BEM) and the displacement discontinuity method (DDM), a set of novel boundary integral equations (BIEs) are derived. The main BIE is derived based on the displacement BIE, followed by two supplementary equations for ensuring enough equations as the unknowns on crack are considered. Besides, the two supplementary BIEs are alternatively used depending on the type of known quantities, traction or displacement. The thermal field is simulated by heat conduction BIEs firstly, then thermal stress analysis for cracked domains is performed by the new derived thermo-elastic BIEs. To treat the domain integrals caused by considering the thermal field, the adaptive orthogonal interpolating moving least-square (IMLS) method based line integration method (AOIMLS-LIM) is proposed for domain integrals containing unknown functions. With AOIMLS-LIM, domain integrals are reduced into boundary integrals with line integrals dimensionally and calculated by adding the line integrals up next. All the necessary temperature values for the line integral points can be interpolated from discretize nodes. The AOIMLS method can avoid singular moment matrices while calculating its shape functions, besides, the shape functions own a vital property, i.e., the interpolating property.

Gentrification or …? Injustice in large-scale residential projects in Hanoi

Large-scale residential developments on expropriated lands in periurban Hanoi resemble forms of gentrification seen elsewhere. But is it gentrification? Current debate over the definition of gentrification has focused on whether the term has become too broad to be useful in different institutional and spatio-temporal contexts. While some push for a generalisable definition based in capitalist development, others argue that the term harbours Western assumptions that fail to usefully explain unique local circumstances. The paper first identifies one such conceptual assumption that must be made explicit since it provides the term’s politicising thrust: displacement generates an experience of social injustice. Then, drawing on surveys and interviews with residents as well as interviews with real estate agents, government officials and academics conducted in Hanoi between 2013 and 2017, the paper evaluates five types of displacement on the city’s outskirts. Because displacement only occurs in marginal cases and generates limited feelings of social injustice, the term ‘gentrification’ is of little use. Instead, the paper suggests that in a context of rapid urbanisation and relatively inclusive economic growth such as that of Hanoi the terms ‘livelihood dispossession’ and ‘value grabbing’ may better capture the experience of social injustice and are therefore more likely to generate political traction.

A new simple topo-climatic model to predict surface displacement in paraglacial and periglacial mountains of the European Alps: The importance of ground heating index and floristic components as ecological indicators

Landscape evolution is occurring at rapid rates in alpine areas in response to recent climate warming, also due to the susceptibility and the heterogeneity of these environments. Here we present a prediction model of surface displacements that takes into account both topographic and climatic variables. Observed points of surficial displacements have been associated to non-climatic (altitude, slope, solar radiation, till deposit type, deposit age, vegetation coverage) and climatic (days of snow permanence, ground surface temperature index, ground heating index, ground cooling index) variables through a general regression model in the European central Alps.The model output shows the importance of slope and ground heating index (GHI) – an estimation of the amount of energy transferred to the ground, to predict surface displacements independently from the type of considered processes. In particular, the general regression model shows that steep zones with high GHI are more susceptible to undergo periglacial and paraglacial processes producing surface displacements. As expected, slope is fundamental to trigger processes such as gravitation, nivation, solifluction and their interactions. The results of our model emphasize the key role of GHI, highlighting the importance of climate in controlling the surface displacement. Indeed, in areas in which GHI is higher, the ground can remain snow free for a longer time and snow melting can be faster, the former favoring more runoff and slopewash, and the latter promoting the saturation of the deposits consequent to a higher intensity of solifluction and/or mass movements processes.Within the study area, the sites with the largest displacements (>35 cm) were detected where permafrost degradation occurred since 1990. This permafrost degradation process could remain one of the main triggering factors of future surface displacements. Our results confirm that when movement involves material with coarse texture (pebbles and boulders) exceeding the rooting depth, only tolerant plant species can withstand the high movement rates. The areas where this can happen (like rock glaciers or screes) act as a physical barrier to grasslands species not adapted to surface displacements and trying to shift towards higher altitude in response to climate warming. However, plant species not considered as indicators of movement (such as graminoids), can develop also with large surface displacements in specific geomorphic conditions. Therefore, the combination of surface displacement type (deep vs surficial), material texture (fine vs coarse) and vegetation cover (high vs low) and floristic composition can be used as a valuable ecological indicator of movement.Our results suggest that both landscape degradation and vegetation displacement can be rapid especially where the air warming was strong as in the selected study area.

Screw fixation without bone grafting for scaphoid fracture nonunion

IntroductionWe previously reported the classification of the scaphoid fracture nonunions as linear, cystic, and sclerotic or displaced types based on radiographic findings. We have been treating the linear and cystic type fractures via screw fixation without bone grafting and the sclerotic or displaced type fractures via screw fixation with bone grafting. In this retrospective study, we report the treatment outcomes of the linear and cystic types of scaphoid fracture nonunions. MethodsNineteen patients with linear and cystic type scaphoid fracture nonunions were included. Two patients had linear type and 17 had cystic type fractures. All the patients were male, their mean age was 29.2 years. All patients were treated with screw fixation alone by a single surgeon. ResultsBone union was achieved in 17 cases. The mean time to bone union was 3.7 months. Bone union was not achieved in one case of linear type and one case of cystic type fracture. The former was thought to be due to misdiagnosis of displaced type as linear type fracture; however, no obvious reason could be found for the latter. DiscussionScrew fixation alone could help achieve bone union in linear type scaphoid fracture nonunions. However, if the type of the fracture is difficult to diagnose based on plain radiography, evaluation using computed tomography should be performed. The cystic type fractures may need to be subclassified according to the location or size of the cyst as well as the viability of the proximal bone fragment.

The Ethics, Politics, and Aesthetics of Migration in Contemporary Art from Angola and Its Diaspora

The Ethics, Politics, and Aesthetics of Migration in Contemporary Art from Angola and Its Diaspora