Real Form Research Articles

Response spectrum method for building structures with general nonviscous damping models

Based on the free vibration solution of non-viscously damped linear systems obtained by Laplace transform, and using Duhamel’s principle for dynamic analysis, a delicate and general solution of non-viscously damped linear multi-degree-of-freedom (MDOF) systems under seismic load, completely in real form, is presented. Response spectrum method and the corresponding modal combination rules are therewith extended to deal with general non-viscously damped structures. Finally, the accuracy and efficiency of proposed methods are discussed and compared with other developed methods by two numerical examples.

PENDAMPINGAN KELOMPOK BELAJAR MANDIRI “FKIP UNIVERSITAS PEKALONGAN MENGAJAR” UNTUK REMAJA USIA SEKOLAH (SMP DAN SMA)

<p>The characteristics of children's behavior in the millennial era are marked by a strong mastery of digital media, so how do parents determine parenting to build a generation that does not accept the bad effects of the digital era, but uses all media wisely and for positive purposes. Family education is an effort to empower families to be able to exercise control over existing resources and active participation in character formation. The condition of the Covid-19 pandemic has forced families to be more attentive to the process of their children participating in their learning activities at school. Many families in Bandengan Village have difficulty guiding their children in learning activities, especially learning assistance during the Covid-19 pandemic. The majority of the people of Bandengan Village earn as casual laborers, small fishermen and factory workers. By implementing the <em>FKIP Mengajar</em> and mentoring program for independent study groups in Bandengan Village, it is hoped that it can help the people of Bandengan Village in the field of education, especially the problem of learning difficulties experienced by teenagers. The method used in this service is active participation and mentoring. This strategy can be summarized as follows: 1. Grouping of Adolescents according to School Age 2. Learning Assistance (school materials, Multi Literacy, and general skills,) 3. Formation of Independent Study Group 4. Independent learning group mentoring. The synergy between universities and the community is needed in a real form. FKIP Pekalongan University provides solutions to problems in the learning assistance of parents for their children. Independent learning group mentoring is a tangible form of solving learning mentoring problems in the community.</p><p><strong>Keywords : </strong>independent learning, family education, mentoring.</p>

Multi-field coupling solutions of functionally graded two-dimensional piezoelectric quasicrystal wedges and spaces

Quasicrystal materials have aroused extensive attentions of researchers due to their excellent properties. In this paper, for the first time, functionally graded two-dimensional piezoelectric QC wedges and spaces which subjected to line force, charge or dislocation are investigated. By virtue of equilibrium and constitutive equations, the real form expressions of stresses and displacements are directly derived without introducing complex vectors. All expressions can be degraded to the classical solutions of homogeneous materials when material parameters have no concern with angle. Before the numerical results are presented, the comparative study between solutions of homogeneous materials from Stroh formalism and solutions of homogeneous materials from our method is performed to verify the accuracy of the formulation and numerical procedure. The mechanical behaviors of QC wedges and spaces under different loads are analyzed carefully by numerical examples. The numerical results reveal that the variations of stress and displacement in each field have much to do with the wedge angle and boundary conditions; line force has little effect on lattice rearrangement. Moreover, the numerical results can be used as references in engineering application when analyzing functionally graded materials.

Development Augmented Reality (AR) Learning Media for Pencak Silat Course at Faculty of Sports and Science Universitas Negeri Padang

Learning activity must contain aspects of practicality, attractiveness and could motivate student, to facilitate the implementation of learning. Interesting learning media and effective also very necessary for students in the pencak silat course at the sports science faculty which contains practical and theoretical material. It should be considered in the selection of media, namely learning objectives, effective, easy to obtain, flexible use and able to visualize something abstract into reality. One of the developments of learning media that is currently still new is learning media using Augmented Reality (AR). AR is a technology application that can present virtual objects in virtual 3D in real form and presented in real time, then be able to present abstract concepts more real. The purpose of this research is to produce pencak silat learning media in terms of practicality aspects, attractiveness and validity. The research development model uses Borg and Gall, with the following stages: (1) Data collection; (2) Planning (3) Development; (4) Design Validation (5) Design Revision (6) Product Trial (7) Product Revision (8) Usage Trial (9) Product Revision (10) Mass production. The results of the study according to the results of expert validation on the development of Augmented Reality-based pencak silat learning media showed very good results and were suitable for use as learning media. The average acquisition of validation results by experts is 91.8%. Student responses to the use of this media in learning pencak silat were very good with scores in the small group trial of 89.97% and the large group trial of 87.15%. Conclusion hfinal result this finding in the form of learning media Augmented Reality in martial arts courses that are valid, practical and effective.

A Hypothesis-Free Bridging of Disease Dynamics and Non-pharmaceutical Policies.

Accurate prediction of the number of daily or weekly confirmed cases of COVID-19 is critical to the control of the pandemic. Existing mechanistic models nicely capture the disease dynamics. However, to forecast the future, they require the transmission rate to be known, limiting their prediction power. Typically, a hypothesis is made on the form of the transmission rate with respect to time. Yet the real form is too complex to be mechanistically modeled due to the unknown dynamics of many influential factors. We tackle this problem by using a hypothesis-free machine-learning algorithm to estimate the transmission rate from data on non-pharmaceutical policies, and in turn forecast the confirmed cases using a mechanistic disease model. More specifically, we build a hybrid model consisting of a mechanistic ordinary differential equation (ODE) model and a gradient boosting model (GBM). To calibrate the parameters, we develop an “inverse method” that obtains the transmission rate inversely from the other variables in the ODE model and then feed it into the GBM to connect with the policy data. The resulting model forecasted the number of daily confirmed cases up to 35 days in the future in the USA with an averaged mean absolute percentage error of 27%. It can identify the most informative predictive variables, which can be helpful in designing improved forecasters as well as informing policymakers.

Break-up effect of the weakly bound 6Li nuclei scattered by 208Pb target

Using different potentials based on phenomenological, semi microscopic, and microscopic models, we investigated the reaction dynamics induced by the weakly bound 6Li ions on a heavy mass target 208Pb at sixteen energy sets ranging from 25 MeV to 210 MeV. The 6Li cluster nature and its dissociation into a core (α-particle) and a valence particle (deuteron) orbiting this core was taken into consideration using the cluster folding model (CFM). The new version of Sao Paulo potential (SPP2) is also used to investigate 6Li+208Pb data. In order to reproduce the experimental data, the strength of real part of potential created using SPP and CFM should be reduced by ~ 49 % and 62 %, respectively. The data could be well reproduced using non-renormalized real cluster folding potential, if an additional dynamical polarization potential (DPP) of repulsive real surface form is introduced. The observed reduction in the strength of the real double folded and cluster folding potentials is due to the break-up effect of 6Li.

Simulative investigation of the influence of surface texturing on the elastohydrodynamic lubrication in chain joints

In timing chain drives, the chain is the critical component regarding the wear. Relative movements take place at the chain joint between pin and bush, which lead to wear of the chain joint due to friction and so to chain elongation. The chain joint is generally lubricated with oils, through which elastohydrodynamic processes can occur in the gap between the pin and the bush of the chain joint. A simulation model is developed here to examine these elastohydrodynamic processes considering a mass conserving cavitation model, the Newtonian flow behaviour of the lubricant and the structuring of the bush surface, whereby the real form of the bush is considered. MBS simulations are used to obtain realistic loads on the chain joint.

Normalizers of maximal tori and real forms of Lie groups

Given a complex connected reductive Lie group G with a maximal torus Hsubset G, Tits defined an extension W_G^{mathrm{T}} of the corresponding Weyl group W_G. The extended group is supplied with an embedding into the normalizer N_G(H) such that W_G^{mathrm{T}} together with H generate N_G(H). In this paper we propose an interpretation of the Tits classical construction in terms of the maximal split real form G(mathbb {R})subset G, which leads to a simple topological description of W^{mathrm{T}}_G. We also consider a variation of the Tits construction associated with compact real form U of G. In this case we define an extension W_G^U of the Weyl group W_G, naturally embedded into the group extension widetilde{U}:=U,{rtimes }, Gamma of the compact real form U by the Galois group Gamma ={mathrm{Gal}}(mathbb {C}/mathbb {R}). Generators of W^U_G are squared to identity as in the Weyl group W_G. However, the non-trivial action of Gamma by outer automorphisms requires W^U_G to be a non-trivial extension of W_G. This gives a specific presentation of the maximal torus normalizer of the group extension {widetilde{U}}. Finally, we describe explicitly the adjoint action of W_G^{mathrm{T}} and W^U_G on the Lie algebra of G.

PELATIHAN DESIGN BUILDING INFORMATION MODELLING (BIM) DENGAN SKETCHUP DI SMK NEGERI 6 KOTA BEKASI

Field Work Lecture (KKN) is one of the activities carried out by all students of the 45 Bekasi Islamic University to apply the knowledge gained while sitting in lectures as well as a real form of community service. To help support KKN (Field Work Lectures) activities, a training program related to the 2021/2022 period KKN (Field work lectures) activity program is needed. The purpose of this training program is to improve the knowledge, attitudes and skills of students in SMK about building drawing technology using 3D (three-dimensional) SketchUp. This program discusses the stages in drawing a one-story residential building technique using the 3D (three-dimensional) digital method. There are many kinds of computer applications that are used to draw in 3D (three dimensions). Although there are many, the SketchUp application was chosen as an interesting solution for drawing 3D (three- dimensional) buildings, because using this application the process is not too difficult. From the results of the training carried out, it can be said that building design can be more effective and efficient if it is implemented into a three-dimensional design, so that the final results can be presented.

Generalized Wintgen inequality for BI-SLANT submanifolds in conformal Sasakian space form with quarter-symmetric connection

PurposeIn 1979, P. Wintgen obtained a basic relationship between the extrinsic normal curvature the intrinsic Gauss curvature, and squared mean curvature of any surface in a Euclidean 4-space with the equality holding if and only if the curvature ellipse is a circle. In 1999, P. J. De Smet, F. Dillen, L. Verstraelen and L. Vrancken gave a conjecture of Wintgen inequality, named as the DDVV-conjecture, for general Riemannian submanifolds in real space forms. Later on, this conjecture was proven to be true by Z. Lu and by Ge and Z. Tang independently. Since then, the study of Wintgen’s inequalities and Wintgen ideal submanifolds has attracted many researchers, and a lot of interesting results have been found during the last 15 years. The main purpose of this paper is to extend this conjecture of Wintgen inequality for bi-slant submanifold in conformal Sasakian space form endowed with a quarter symmetric metric connection.Design/methodology/approachThe authors used standard technique for obtaining generalized Wintgen inequality for bi-slant submanifold in conformal Sasakian space form endowed with a quarter symmetric metric connection.FindingsThe authors establish the generalized Wintgen inequality for bi-slant submanifold in conformal Sasakian space form endowed with a quarter symmetric metric connection, and also find conditions under which the equality holds. Some particular cases are also stated.Originality/valueThe research may be a challenge for new developments focused on new relationships in terms of various invariants, for different types of submanifolds in that ambient space with several connections.

Invariant Einstein metrics on real flag manifolds with two or three isotropy summands

We study the existence of invariant Einstein metrics on real flag manifolds associated to simple and non-compact split real forms of complex classical Lie algebras whose isotropy representation decomposes into two or three irreducible subrepresentations. In this situation, one can have equivalent submodules, leading to the existence of non-diagonal homogeneous Riemannian metrics. In particular, we prove the existence of non-diagonal Einstein metrics on real flag manifolds.

Monodromy bootstrap for SU(2|2) quantum spectral curves: from Hubbard model to AdS3/CFT2

We propose a procedure to derive quantum spectral curves of AdS/CFT type by requiring that a specially designed analytic continuation around the branch point results in an automorphism of the underlying algebraic structure. In this way we derive four new curves. Two are based on SU(2|2) symmetry, and we show that one of them, under the assumption of square root branch points, describes Hubbard model. Two more are based on SU(2|2) × SU(2|2). In the special subcase of zero central charge, they both reduce to the unique nontrivial curve which furthermore has analytic properties compatible with PSU(1, 1|2) × PSU(1, 1|2) real form. A natural conjecture follows that this is the quantum spectral curve of AdS/CFT integrable system with AdS3 × S3 × T4 background supported by RR-flux. We support the conjecture by verifying its consistency with the massive sector of asymptotic Bethe equations in the large volume regime. For this spectral curve, it is compulsory that branch points are not of the square root type which qualitatively distinguishes it from the previously known cases.

An Analysis of Critical Education Study on Independent Learning Campus Policy

Critical education is education that is able to free from ignorance, poverty, oppression, and lift the condition of the subject from the pits of oppression and helplessness, both human and environmental. Freedom to learn is an idea where the educational paradigm is not confined and has a meaning that is freer than the freedom of life. The purpose of this study is to describe a critical educational analysis of the policy of independent campus learning in Indonesia. The research methodology used is library research, using the following steps: knowing and finding out the type of library needed, reading the type of library needed, conducting an assessment, presenting the results of the literature study. The sources of this research are research journals, books and the internet. The results showed that the campus policy of independent learning, independent learning supports the realization of critical education. This can be seen from the programs launched in the policy where students are required to be creative, critical and dare to apply their knowledge in a real form. Students voluntarily (can take or not) to get their rights such as internships.

A bottom-up ‘Game of Lie’ cellular automaton evolution in SO(3) root space both nucleating, crystallizing and space-filling the complete atomic realm

Re-examining Marius Sophus Lie’s Ph.D. thesis Over en Classe geometriske Transformationer from 1871 I found that its bearings on the “nature of Cartesian geometry” are that it “translates any geometric theorem into an algebraic one and thus…of the geometry of space a representation of the algebra of three variable quantities” with both the algebraic and “geometrical transformation…consisting of a transition from a point to a straight line as element…through a particularly remarkable transformation” in which “the Plücker line geometry can be transformed into a sphere geometry”, by its “straight lines of length equal to zero” partial derivative elements “turning…into the sphere’s rectilinear generatrices” both as “partial differential equations of the first order” and physical “geodetic curves” under the “general equation system f(x, y, z, dx, dy, dz) = 0” and its “spatial reciprocity” that “relative to the given line complex” in x, y, z “corresponds a certain curve-net” in the simultaneous “line element (dx, dy, dz)”. This is a revolutionary geometric algebra discovery of the constitution of our Universe as a stru ctural phase transition between Straight and Round, transcending Hermann Grassmann’s Ausdehnungslehre (1844/1862) and William Kingdom Clifford’s Space-theory of Matter (1876) by the infinitesimal transformations opening up spherical geometry in its real form identity state later assigned as SO(3). The continuous groups, whose vast field occupied the rest of his all too short life were not mentioned in the thesis but implied both in the term Classe (class) geometriske transformationer and the coverage of their principles in an “unlimited manifold of possible systems”; e.g. “turning rounded curves into rounded curves” and “straight lines into straight lines”, where “one can choose any space-curve which depends upon three parameters as the element of the geometry of the space”, and it “is possible to create a representation of an algebra that embraces an arbitrary number of variables.” Important examples were given, except of course of the still dormant elementary particles. Now, as the prime of matter’s appearance they step forth as the most natural to examine by the true Lie algebras in their original form. When over a long series of years I have scientifically carried out this, the result as here so far concluded is a concrete cellular automaton building kit of the Standard Model and all its features, and their mechanisms and dealings in a structural R3×SO(3) wave-packet organization, both inwards from the elementary particles and outwards via the periodic table of the atoms over the further hierarchical growth of this in molecular and crystal stages to an isotropic space-filling of the whole classical Euclidean Universe in harmonic exchange with its relativistic spherical moiety, and the dark mass and energy collectively worked out in the differential interstice between them.

SUBALTERNITAS TOKOH DIAH AYU DAN MAHARANI: ANTARA KUTUKAN DAN SENJATA

The story of “Kutukan Dapur” by Eka Kurniawan presents a colonial setting: Dutch colonialism and postcolonialism in the image of two characters, Diah Ayu and Maharani. Maharani is in patriarchal shackles, which is ingrained in her family life and social structure. Meanwhile, Diah Ayu is in the bonds of Dutch colonialism, which is brought back by the author. Both are in a subaltern position but in different conditions. Based on this description, this research asks two questions which are analyzed using Gayatri Spivak's subaltern theory, (1) what the position of Diah Ayu and Maharani in "Kutukan Dapur" short story, and (2) how the subaltern is constructed through the efforts of the two characters to get out of that position is. The method used is qualitative. The narratives are classified and analyzed to understand the subaltern's position and construction and its resistance efforts. This research indicates that Maharani and Diah Ayu are subalterns of Maharani dominated by patriarchy, while Diah Ayu is dominated by Dutch colonialism. Maharani fought back, but only with an idea or ideas. Unlike Diah Ayu, she is able to fight in a real form. However, as the author, Eka is trapped in a biased construction in addition to gender bias and representation. In subaltern studies, representation is only a tool towards more real domination. The two figures seem to be fighting against the power structure (colonial and patriarchal) but are still trapped in the dominance of the other.

Complexified Hermitian Symmetric Spaces, Hyperkähler Structures, and Real Group Actions

There is a known hyperkähler structure on any complexified Hermitian symmetric space G/K, whose construction relies on identifying G/K with both a (co)adjoint orbit and the cotangent bundle to the compact Hermitian symmetric space Gu/K0. Via a family of explicit diffeomorphisms, we show that almost all of the complex structures are equivalent to the one on G/K; via a family of related diffeomorphisms, we show that almost all of the symplectic structures are equivalent to the one on \(T^{*}\left (G_{u}/K_{0}\right )\). We highlight the intermediate Kähler structures, which share a holomorphic action of G related to the one on G/K, but moment geometry related to that of \(T^{*}\left (G_{u}/K_{0}\right )\). As an application, for the real form G0 ⊂ G corresponding to G0/K0, the Hermitian symmetric space of noncompact type, we give a strategy for study of the action on G/K using the moment-critical subsets for the intermediate structures. We give explicit computations for SL(2).

Visible actions of compact Lie groups on complex spherical varieties

With the aim of uniform treatment of multiplicity-free representations of Lie groups, T. Kobayashi introduced the notion of visible actions on complex manifolds. He proved that for a Lie group $U$ the space of global sections of a $U$-equivariant holomorphic vector bundle $\mathcal{W}$ is multiplicity-free if the $U$-action on the base space $X$ is strongly visible and if the isotropy representations on the fibers are multiplicity-free under some compatibility condition on an anti-holomorphic diffeomorphism of $\mathcal{W}$. Especially in the case of the trivial line bundle, his theorem says that if a Lie group acts on the base space strongly visibly then the space of holomorphic functions is multiplicity-free. In short, the visibility is a geometric condition that assures the multiplicity-freeness property. In this article we consider the converse direction when $U$ is a compact real form of a connected complex reductive algebraic group $G$ and $X$ is an irreducible complex algebraic $G$-variety. In this setting the multiplicity-freeness property of the space of algebraic sections of arbitrary $G$-line bundle is equivalent to the sphericity of the $G$-action on $X$. Then our main result says that the multiplicity-freeness property implies the visibility, namely, if $X$ is a $G$-spherical variety then the $U$-action on $X$ is strongly visible.

Tinjauan Historis Kewenangan Penyelesaian Perselisihan Hasil Pemilihan Umum (PHPU) Dan Perselisihan Hasil Pemilihan (PHP) Oleh Mahkamah Konstitusi (MK)

One of the real forms of change based on the will to create a democratic government is the establishment of the Constitutional Court as a judicial institution formed with the aim of maintaining the implementation of constitutional values in the implementation of state life. With the Constitutional Court, currently the judicial power in Indonesia is run by two institutions, namely the Supreme Court and the Constitutional Court. The birth of the Constitutional Court itself is an answer to the desire that judicial institutions can conduct legal testing of the Constitution that previously could not be done, but the number of cases of disputed election results that entered the Constitutional Court also raises a new question, because is it right for the Constitutional Court to decide the dispute over the election results which is actually a political matter?. This writing will use normative research methods. Research is conducted by conducting searches on legal materials, books, journals and scientific articles both published both domestically and abroad. Furthermore, from the sources obtained, analysis is carried out using qualitative juridical analysis methods. The results of the study resulted in an analysis related to the authority of the Constitutional Court to decide the case of Disputed Election Results and Disputed Election Results where this authority before the formation of the Constitutional Court is still not clear to which institution will decide the case.

Tinjauan Historis Kewenangan Penyelesaian Perselisihan Hasil Pemilihan Umum (PHPU) Dan Perselisihan Hasil Pemilihan (PHP) Oleh Mahkamah Konstitusi (MK)

One of the real forms of change based on the will to create a democratic government is the establishment of the Constitutional Court as a judicial institution formed with the aim of maintaining the implementation of constitutional values in the implementation of state life. With the Constitutional Court, currently the judicial power in Indonesia is run by two institutions, namely the Supreme Court and the Constitutional Court. The birth of the Constitutional Court itself is an answer to the desire that judicial institutions can conduct legal testing of the Constitution that previously could not be done, but the number of cases of disputed election results that entered the Constitutional Court also raises a new question, because is it right for the Constitutional Court to decide the dispute over the election results which is actually a political matter?. This writing will use normative research methods. Research is conducted by conducting searches on legal materials, books, journals and scientific articles both published both domestically and abroad. Furthermore, from the sources obtained, analysis is carried out using qualitative juridical analysis methods. The results of the study resulted in an analysis related to the authority of the Constitutional Court to decide the case of Disputed Election Results and Disputed Election Results where this authority before the formation of the Constitutional Court is still not clear to which institution will decide the case.

Intertemporal effects of imperfect competition through forward contracts in wholesale electricity markets

This paper quantifies how market power and uncompetitive behavior in forward markets affect equilibrium prices to the detriment of consumers in the electricity industry in Colombia. The literature on competition in wholesale electricity markets has largely overlooked the effect of forward contracts on market power. This paper shows how the inclusion of price-endogenous forward contract terms—which are usually unobserved in wholesale electricity markets—can deteriorate competition. The presence of a deregulated and bilateral over-the-counter medium-term market in the electricity industry facilitates the imposition of special contract terms that can be exploited in favor of participants with market power. Using public reports from the Colombian independent system operator, I find evidence of an increasingly prevalent type of contract imposing terms that transfer risks from the medium- to the short-term market (intertemporal effect). I model these endogenous forward contracts, ef, to determine market equilibrium prices for end users. Thus, I develop an agent-based optimization model considering the real form (step function) of the residual demand in view of real constraints in hydroelectricity markets (i.e., water management in reservoirs). I propose a genetic algorithm to estimate results, and I use the Colombian electricity market as case study. I find that the use of endogenous forward contracts increases spot prices.