Space Form Research Articles

Respons terhadap Komunitas AnieSpace sebagai Bentuk Ruang Publik Baru

In the era of digital transformation, the concept of public space has experienced a significant shift. Traditional public spaces such as parks and squares are no longer the only platform for social interaction. Twitter or what has now changed its name to X is a new public space, which shows the characteristics of what Habermas said is a space that supports and allows political criticism to be discussed. AnieSpace is a community on the X platform which has emerged as a new public space in the digital realm. The aim of this research is to analyze the AnieSpace community as a new public space and determine the response to the AnieSpace community as a new form of public space. Researchers used qualitative literature study methods and also interview methods. The results of the research show that the AnieSpace community is an example of a public space that meets the criteria. The response to the new public space AnieSpace was very positive, which was marked by the increase in the electability of candidate pair 01. Communication via AnieSpace was greeted with enthusiasm by the public, as evidenced by the high number of listeners in the initial discussion.

TEACHING THE BASICS OF MULTIMEDIA TO ENVIRONMENTAL DESIGNERS DURING THEIR PROFESSIONAL TRAINING

The article discusses the features of teaching multimedia to environmental designers as part of training sessions. A brief review of sources was carried out, attention was paid to the definition of the concept of multimedia in the context of the study. Special applications and programmes for the development of multimedia materials used in educational practice are indicated, their capabilities are defined. The main problems in multimedia training of environ mental designers are considered. The authors present the methodological components of the educational process, aimed at the formation of skills in the development and use of multimedia technologies by students, including in the design of the interior and exterior environment. The article discloses the issues of the development of knowledge and skills of students necessary for the creation of professional presentations of their research and creative works, as well as the presentation of copyright projects in the form of a virtual space. Ways to solve the stated problem are proposed.

Smart Tourism Development for Recreation in Pesanggrahan Sangga Buana Urban Forest, South Jakarta

Urban forest is a form of green open space in the urban area. The use of information and communication technology based on smart tourism is an important factor in providing facilities for recreational areas. This research aims to formulate smart tourism-based development at PSBUF for recreation based on resources, management and preferences of visitors and the surrounding community. Data collection methods used were literature studies, field observation, questionnaires, and interviews. The data analysis used were qualitative, quantitative descriptive, and SWOT. Pesanggrahan Sangga Buana Urban Forest (PSBUF) has the potential to develop smart tourism-based facilities for recreation. Standard recreational facilities are available in the form of prayer rooms, toilets, gazebos, jogging tracks, parking lots, badminton courts and football fields. Urban forest management is carried out by EFG Sangga Buana with supervision by the DKI Jakarta Parks and Urban Forest Service. EFG Sangga Buana strives to preserve the environment in the DKI Jakarta area with facilities that do not disturb the surrounding ecosystem. The existence of jogging tracks and sports fields is still lacking. The biggest motivation for visiting the urban forest is to refresh the mind from daily boredom. Public facilities that are really needed are rubbish bins. Respondents need for smart tourism facilities in the form of CCTV is the highest. Recommendations for the development of facilities are optimizing potential, maximizing management cooperation, increasing PSBUF promotions, and optimizing coordination between managers.

On Curvature Pinching for Submanifolds with Parallel Normalized Mean Curvature Vector

In this note, we investigate the pinching problem for oriented compact submanifolds of dimension n with parallel normalized mean curvature vector in a space form Fn+p(c). We first prove a codimension reduction theorem for submanifolds under lower Ricci curvature bounds. Moreover, if the submanifolds have constant normalized scalar curvature R≥c, we obtain a classification theorem for submanifolds under lower Ricci curvature bounds. It should be emphasized that our Ricci pinching conditions are sharp for even n and p=2.

Earnest struggles: structural transformation, government finance and the recurrence of debt crisis in Senegal

Faced with a more multipolar world, scholars of International Political Economy are sharpening their tools to make sense of the longue durée of post-colonial institutions, international financial subordination and the quest for self-determination. This article develops the notion of ‘earnest struggles’ in Senegal’s postcolonial history and shows that successive governments have indeed tried to move their country forward against the odds. The focus is on three struggles: First, the attempts at transforming the Senegalese economy away from colonial cash crops and the influence of the French from 1960 to 1980. Second, the struggle of grappling with Global South debt crisis and the devaluation of the Franc CFA by 50% between 1980 to 2004. Third, the struggle to expand the Senegalese economy with newfound fiscal space and novel forms of external debt since international debt relief in 2004 until today. Based on financial data and interviews in Dakar and Paris, I argue that these struggles have led to some structural transformation. However, the danger of debt crisis has not gone, and economic self-determination has remained precarious. Dependence on foreign finance has stayed and reached record levels in recent years. Relative delinking and the search for regional complementarities offers a more promising avenue to break out of the structural condition of international financial subordination.

Study on the Spatial and Architectural Morphological Characteristics of Buyei Traditional Settlements and Their Sustainable Development Strategies

The development of traditional settlements and architecture in China has changed along with the acceleration of the urbanization process, especially the changes are more obvious in the areas inhabited by ethnic minorities. We take the traditional Buyei settlement space and architectural form as the object of research, summarize its characteristics, and study the development and change of the traditional Buyei settlement after the reform and opening up, summarize the characteristics of the traditional Buyei settlement, and put forward the suggestions for the protection and construction of the settlement, which is of great significance to the protection of national culture and the construction of "beautiful countryside". The promotion of ecological civilization is an important part of the current social and economic development, and the traditional architecture of the Buyi people contains the concepts of the unity of man and nature, harmony between man and nature, and respect for nature, which should become an important part of the construction of China's ecological civilization. Especially in the context of rural revitalization, analyzing the sustainable development strategy of the vast minority areas is necessary for balancing economic development and ecological civilization, and can play a positive role in promoting urban-rural integration, accelerating rural construction and realizing green development.

Outer billiards in the spaces of oriented geodesics of the three‐dimensional space forms

AbstractLet be the three‐dimensional space form of constant curvature , that is, Euclidean space , the sphere , or hyperbolic space . Let be a smooth, closed, strictly convex surface in . We define an outer billiard map on the four‐dimensional space of oriented complete geodesics of , for which the billiard table is the subset of consisting of all oriented geodesics not intersecting . We show that is a diffeomorphism when is quadratically convex. For , has a Kähler structure associated with the Killing form of . We prove that is a symplectomorphism with respect to its fundamental form and that can be obtained as an analogue to the construction of Tabachnikov of the outer billiard in defined in terms of the standard symplectic structure. We show that does not preserve the fundamental symplectic form on associated with the cross product on , for . We initiate the dynamical study of this outer billiard in the hyperbolic case by introducing and discussing a notion of holonomy for periodic points.

An optimized Chen first inequality for semi-slant submanifolds in Lorentz Kenmotsu space forms

In this paper, we present necessary and sufficient conditions for a Lorentz contact manifold to be a Lorentz Kenmotsu manifold. Moreover, we obtain the optimal Chen first inequality for semi-slant submanifolds in Lorentz Kenmotsu space forms. Furthermore, the equality case of Chen inequality has been discussed.

Resharing spaces, services and mobility: Developing a reshareability index for sustainable planning in Oslo

Recent studies on sharing cities and sharing economies have focused on what can be (or is being) shared, such as public spaces, food, mobility, ideas, knowledge, governance strategies, as well as community facilities, such as places for working, education and welfare. Following this emerging trend of sharing, this paper explores the novel approach of resharing, that aims to support, amongst other things, the integration of mobility sharing and different forms of space sharing in residential, office and commercial buildings. Firstly, the study presents a novel theoretical and conceptual approach to (re)sharing, and secondly, it reports on an empirical analysis conducted in the urban district of Hovinbyen in Oslo, using the sub-districts of Løren and Økern as the two main cases. The study analyzes existing preconditions for reshareability and suggests an index of reshareability to guide future developments. Løren is, to some extent, better equipped than Økern to apply the resharing approach, and can thus become a place for further experimentation with local communities and stakeholders. The study contributes to understanding and assessing the reshared qualities and characteristics of city neighborhoods, which can provide a foundation for developing planning strategies to make local neighborhoods more ‘sharing oriented’ or ‘reshareable’.

Integral terminal sliding mode fault tolerant control of quadcopter UAV systems

The article presents an active fault-tolerant control scheme with an integral terminal sliding mode controller for the UAV systems. This scheme effectively addresses saturation issues, disturbances, and sensor and actuator faults. Initially, the quadcopter UAV's model is represented in state space form. Subsequently, an augmented system incorporating auxiliary states from sensor faults is developed. An adaptive sliding mode observer is proposed for estimating the actuator and sensor faults. The integral terminal sliding mode fault-tolerant control, designed for altitude and attitude regulation, relies on fault estimation data. In contrast, a cascade proportional-integral-derivative (PID) controller is employed for position control. Simulation results demonstrate the superiority of the proposed method over existing control algorithms.

A generalized Wintgen inequality in quaternion Kähler geometry

In this paper, we establish a generalized Wintgen inequality for quaternionic bi-slant submanifolds and QR-submanifolds (with minimal codimension) in quaternion space forms. We also aim to characterize the second fundamental form of those submanifolds for which the equality cases can hold. Finally, we provide examples of submanifolds embedded in quaternion space forms to support our results.

A Study on Tourist Satisfaction Based on the Conservation and Reuse of Alleyway Spaces in Urban Historic Neighborhoods

The preservation and reuse of historical alley spaces infuse these areas with renewed vitality, which holds significant importance for the direction of preservation and restoration efforts in historical districts. This paper focuses on Jinyu Alley in Quanzhou and identifies a study targeting tourists for the protection and reuse of historical alley spaces. Through preliminary research and interviews, a system of evaluation indicators for urban historical alley spaces post-usage was established using a factor analysis, extracting five main components: historical context, neighborhood space, commercial environment, supporting facilities, and operational management. Additionally, a modified importance–performance analysis (IPA) method was employed to conduct a quadrant analysis on tourist satisfaction evaluation indicators. Transformation quadrant distribution maps of various evaluation indicators reveal dissatisfaction among tourists with certain aspects of supporting facilities, the commercial environment, and neighborhood space. Relevant departments should prioritize improvements in dining quality, business variety, neighborhood traffic connections and transformations, neighborhood space form and scale, landscape greening, environmental elements, parking availability, and trash bin density for future enhancements. Finally, based on the results of tourist satisfaction surveys and information gathered from interviews with a minority of residents, a more inclusive and sustainable strategy for the protection and reuse of historical alley spaces is formulated.

Chen inequalities on warped product Legendrian submanifolds in Kenmotsu space forms and applications

In the current work, we study the geometry and topology of warped product Legendrian submanifolds in Kenmotsu space forms F2n+1(ϵ)\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$\\mathbb{F}^{2n+1}(\\epsilon )$\\end{document} and derive the first Chen inequality, including extrinsic invariants such as the mean curvature and the length of the warping functions. Additionally, sectional curvature and the δ-invariant are intrinsic invariants related to this inequality. An integral bound is also given in terms of the gradient Ricci curvature for the Bochner operator formula of compact warped product submanifolds. Our primary technique is applying geometry to number structures and solving problems such as problems with Dirichlet eigenvalues.

Above Ground Biomass and Carbon Sequestration of Urban Green Spaces in Danang City, Vietnam

Green space in cities is an essential component of the urban environment. Different forms of urban green spaces, with varying populations, plant communities, and roles, offer varying urban ecological advantages. Using the i-Tree Eco model, this study examined the structural characteristics of urban green trees and calculated the biomass storage capacity and carbon sequestration in urban green spaces in Da Nang City. The results revealed a considerable diversity of species composition among 7,513 trees belonging to 42 species of 20 families studied in four types of green spaces, with Terminalia catappa, Cyrtostachys renda, and Roystonea regia dominating. The average Shannon biodiversity index was 2.9, with the institution having the highest at 2.6 and the park having the lowest at 2.2. The total leaf biomass per hectare was 588.0 kg/ha, and the carbon sequestration rate was 2,845.30 kg/ha. Ficus subpisocarpa was the species with the highest value for these two advantages, and the park was the green space with the highest benefit in terms of biomass and carbon sequestration.

Rigidity results on totally real submanifolds in complex space forms

Rigidity results on totally real submanifolds in complex space forms

Stability from rigidity via umbilicity

Abstract We consider a range of geometric stability problems for hypersurfaces of spaceforms. One of the key results is an estimate relating the distance to a geodesic sphere of an embedded hypersurface with integral norms of the traceless Hessian operator of a level set function for the open set bounded by the hypersurface. As application, we give a unified treatment of many old and new stability problems arising in geometry and analysis. Those problems ask for spherical closeness of a hypersurface, given a geometric constraint. Examples include stability in Alexandroff’s soap bubble theorem in space forms, Serrin’s overdetermined problem, a Steklov problem involving the bi-Laplace operator and non-convex Alexandroff–Fenchel inequalities.

Complex submanifolds of indefinite complex space forms

In this short paper, we derive a new result on Umehara algebra. As a consequence, we prove that an indefinite complex hyperbolic space and an indefinite complex projective space do not share a common complex submanifold with induced metrics, answering a question raised in Cheng et al.

On Thurston's Geometrical Space Form Problem: On Quasi Space Forms

A proposal is made for what may well be the most elementary Riemannian spaces which are homogeneous but not isotropic. In other words: a proposal is made for what may well be the nicest symmetric spaces beyond the real space forms, that is, beyond the Riemannian spaces which are homogeneous and isotropic. The above qualification of ‘’nicest symmetric spaces” finds a justification in that, together with the real space forms, these spaces are most natural with respect to the importance in human vision of our ability to readily recognise conformal things and in that these spaces are most natural with respect to what inWeyl’s view is symmetry in Riemannian geometry. Following his suggestion to remove the real space forms’ isotropy condition, the quasi space forms thus introduced do offer a metrical, local geometrical solution to the geometrical space form problem as posed by Thurston in his 1979 Princeton Lecture Notes on ‘’The Geometry and Topology of 3- manifolds”. Roughly speaking, quasi space forms are the Riemannian manifolds of dimension greater than or equal to 3, which are not real space forms but which admit two orthogonally complementary distributions such that at all points all the 2-planes that in the tangent spaces there are situated in a same position relative to these distributions do have the same sectional curvatures.

Quasi Yamabe Solitons on CR Submanifolds of Maximal CR Dimension in Kähler Manifolds

In this paper we give necessary and sufficient conditions for a CR submanifold of maximal CR dimension in arbitrary Kähler manifold to admit (quasi-)Yamabe structure, with naturally chosen soliton vector field. When the ambient manifold is a non-flat complex space form, we give a complete classification of such solitons, under certain conditions.

On Wintgen Ideal Submanifolds Satisfying Some Pseudo-symmetry Type Curvature Conditions

Let M be a Wintgen ideal submanifold of dimension n in a real space form Rn+m(k) of dimension (n + m) and of constant curvaturek, n ≥ 4, m ≥ 1. Let g, R, Ricc, g ∧ Ricc and C be the metric tensor, the Riemann-Christoffel curvature tensor, the Ricci tensor, the Kulkarni-Nomizu product of g and Ricc, and the Weyl conformal curvature tensor of M, respectively. In this paper we study Wintgen ideal submanifolds M in real space forms Rn+m(k), n ≥ 4, m ≥ 1, satisfying the following pseudo-symmetry type curvature conditions: (i) the tensors R · C and Q(g, R) (resp., Q(g, C), Q(g, g ∧ Ricc), Q(Ricc, R) or Q(Ricc, g ∧ Ricc)) are linearly dependent; (ii) the tensors C · R and Q(g, R) (resp., Q(g, C), Q(g, g ∧ Ricc), Q(Ricc, R) or Q(Ricc, g ∧ Ricc)) are linearly dependent; (iii) the tensors R·C -C ·R and Q(g, R) (resp., Q(g, C), Q(g, g∧Ricc), Q(Ricc, R) or Q(Ricc, g∧Ricc)) are linearly dependent.