scholarly journals Extended Families in the Main Belt and in the Trojan Swarms

2005 ◽  
Vol 13 ◽  
pp. 758-758 ◽  
Author(s):  
Zoran Knezevic ◽  
Andrea Milani
Keyword(s):  
Hubble Space Telescope ◽  
Family Members ◽  
Mean Motion Resonances ◽  
Size Dependent ◽  
Proper Elements ◽  
Chaotic Diffusion ◽  
Large Spread ◽  
The Family ◽  
Long Time ◽  
Asteroid Families

The availability of highly accurate synthetic proper elements for a large number of asteroids made possible detailed studies of the structure of asteroid families. The entire region of the Vesta family is dominated by bodies with D < 7 km. The large spread of family members appears to be primarily due to Yarkovsky mobility, a strongly size-dependent. The proper elements of the asteroids the region (except close to mean motion resonances) are stable over very long time spans; thus chaotic diffusion could not play a significant role. The total volume of the family members with diameter less than 7 km amounts approximately to 6 x 104 cubic km, the volume of a crater with 100 km diameter and average depth 7 km. If the albedo feature, visible in the Hubble Space Telescope images, is really a crater its volume could be even larger. Thanks to the recently computed catalogs of proper elements for 1167 trojans, there are now confirmed dynamical families in the trojan swarms. This allows to begin to study the collisional evolution with constraints from observations.

scholarly journals What we know about Families of Asteroids

1989 ◽  
Vol 8 ◽  
pp. 273-279
Author(s):  
V. Zappala’
Keyword(s):  
Family Members ◽  
Parent Body ◽  
Classification Methods ◽  
Hypervelocity Impacts ◽  
Mass Distributions ◽  
Proper Elements ◽  
The Family ◽  
Families Of Asteroids ◽  
Asteroid Families ◽  
Degree Of Fragmentation

AbstractAsteroid families are considered for the most to represent fragments of collisional breakup of precursor bodies. If true, this offers the unique possibility to examine the interiors of large bodies and to study the processes of collision on a scale much larger than can be done in laboratory. Indeed, the general features of the mass distributions and of the ejection velocities of the family members can be interpreted in terms of collisional disruption of a parent body followed by self-gravitational reaccumulation on the largest remnant. However, several problems remain open: a) the degree of fragmentation in real families is generally lower than that observed for experimental targets; b) the relative velocities computed including also proper eccentricity and inclination differences are higher by about a factor 4 than those derived from semiaxes differences only; c) only very few of the presently proposed families have distributions of inferred mineralogies consistent with cosmochemistry. Further studies are needed, including better proper elements computation, classification methods, and new investigations on the physics of hypervelocity impacts.

Spin clusters inside four young asteroid groups

2020 ◽  
Vol 493 (2) ◽  
pp. 2556-2567
Author(s):  
V Carruba ◽  
L G M Ramos ◽  
F Spoto
Keyword(s):  
Numerical Simulations ◽  
Transition Region ◽  
Semimajor Axis ◽  
Family Members ◽  
Proper Elements ◽  
The Family ◽  
Induced Fission ◽  
Spin Clusters ◽  
Spin Pairs ◽  
Asteroid Families

ABSTRACT Asteroid groups may either form because of collisions or because of spin induced fission. Recently it has been shown that young spin clusters tend to form more frequently in young collisional families than in older groups. Here, we study the occurrence of spin clusters inside four very recently identified asteroid groups: the (525) Adelaide, (2258) Viipuri, (6142) Tantawi, and (18429) (1994 AO1) groups. Using combinations of techniques based on backward numerical simulations, we identify four spin pairs among the family members. All groups have fractions of observed spin clusters well above 5 per cent, so confirming an observed trend for other young asteroid groups. The (2258) Viipuri and (18429) (1994 AO1) groups are compatible with an origin as a spin clusters themselves, and could be other occurrences of cascade spin clusters, as recently detected in other asteroid groups. Finally, the separation between collisional asteroid families and spin clusters in domains of dispersion of proper semimajor axis, σa, versus age seems to be more complex than previously thought. While spin clusters tend to be much more compact in proper elements than collisional families, there appears to be a transition region in σa where both the groups be found.

scholarly journals Asteroid Proper Elements: The Big Picture

1994 ◽  
Vol 160 ◽  
pp. 143-158 ◽  
Author(s):  
Zoran Knežević ◽  
Andrea Milani
Keyword(s):  
Point Of View ◽  
Dynamical Structure ◽  
Main Belt ◽  
Secular Resonances ◽  
Mean Motion Resonances ◽  
Mean Motion ◽  
Proper Elements ◽  
Big Picture ◽  
Linear And Nonlinear ◽  
Asteroid Families

Four perturbation theories presently used to compute asteroid proper elements are reviewed, and their results are briefly discussed (Milani and Knežević, 1990, 1992, 1994, for low to moderate eccentricity/inclination main belt objects; Lemaitre and Morbidelli, 1994, for high e, I objects; Milani, 1993, for Trojans; Schubart, 1982, 1991 for Hildas). The most important recent improvements are described, in particular those pertaining to the upgrades of the previous analytic and semianalytic solutions. The dynamical structure of the asteroid main belt, as defined by the low order mean motion resonances and by linear and nonlinear secular resonances, is considered from the point of view of the effects of these resonances on the accuracy and/or reliability of the computation of proper elements and on the reliability of the identification of asteroid families.

scholarly journals Peran Visi Bagi Kelanggengan Bisnis Keluarga

PRAXIS ◽  
2019 ◽  
Vol 2 (1) ◽  
pp. 30
Author(s):  
Andreas Heryjanto
Keyword(s):  
Family Business ◽  
Dynamic Capabilities ◽  
Family Members ◽  
Value Proposition ◽  
The Family ◽  
Long Time ◽  
Family Harmony

Business longevity is one of the goals of a family business, where business is expected to last for a long time, whether in the hands of family members or handled by professionals. The longevity of a family business is influenced by the values in it. Values that are needed in the family business are usually embedded in a vision. In vision contained the values, beliefs, principles, and binding promises, which characterize a family business. The embodied vision by all owners and employees is able to satisfy customers, which ultimately perpetuates a family business. In order to realize the sustainability of the family business, integration between family harmony, tolerance of differences, participation and openness among stakeholders are needed. Based on the business vision, the factors such as competitive value proposition, distinctive capabilities, dynamic capabilities, trust and commitment are created, which are useful for achieving the longevity of a family business. ABSTRAK Kelanggengan bisnis merupakan salah satu tujuan bisnis keluarga, di mana bisnis diharapkan dapat berlangsung dalam waktu yang lama, entah di tangan anggota keluarga ataupun ditangani oleh profesional. Kelanggengan suatu bisnis keluarga dipengaruhi oleh nilai-nilai yang ada di dalamnya. Nilai-nilai yang sangat dibutuhkan dalam bisnis keluarga biasanya terkandung dalam suatu visi. Di dalam visilah terkandung nilai-nilai, keyakinan, prinsip, dan janji yang mengikat, yang memberikan ciri khas suatu bisnis keluarga. Pengejawantahan visi dengan tepat oleh seluruh pemilik dan karyawan mampu memuaskan pelanggan, yang akhirnya melanggengkan suatu bisnis keluarga. Untuk mewujudkan tercapainya kelanggengan bisnis keluarga tersebut, diperlukan keterpaduan antara harmoni keluarga, toleransi terhadap perbedaan, partisipasi dan keterbukaan di antara pemangku kepentingan. Bersumber dari visi bisnis terciptalah faktor-faktor janji nilai bersaing, kemampuan unik, kemampuan dinamis, kepercayaan dan komitmen, yang bermanfaat untuk tercapainya kelanggengan suatu bisnis keluarga.

scholarly journals PENGALAMAN KELUARGA DALAM MERAWAT DEKUBITUS

2017 ◽  
Vol 2 (1) ◽  
pp. 11
Author(s):  
Rita Sari
Keyword(s):  
Family Members ◽  
Deep Understanding ◽  
Phenomenological Approach ◽  
Pressure Sores ◽  
The Family ◽  
Long Time ◽  
Field Notes ◽  
Written Questions ◽  
Depth Interviews ◽  
At Home

Immobilization is a problem faced by patients with chronic illness, the patients is very weak and paralyzed patients in a long time. This study have purpose  to gain a deep understanding of the experience of families in caring for family members is immobilized with pressure sores at home. This study used qualitative methods. Participants are families who care for patients at home who are immobilized with pressure sores. Collecting data with in-depth interviews by means of instrument is the researcher's own self, written questions as an interview, used recording devices and used field notes.  Criterion sampling by taking 6 participants. Analysis of data used a phenomenological approach. The results showed that the family had a positive experience; Can be more patient, and assume that caring for a sick family member has its own challenges, being able to be with other families in caring for patients, being able to give affection and obligation as a child to parents can help take care of it. There was also an unpleasant (negative) family experience during the care of sick family members, the family felt tired, not strong and bored during patient care. The conclusion of the study is that families have positive and negative experiences in caring for family members with decubitus

scholarly journals Higher Order and Iterative Theories to Compute Asteroid Mean Elements

1999 ◽  
Vol 172 ◽  
pp. 359-360 ◽  
Author(s):  
Z. Knežević ◽  
A. Milani
Keyword(s):  
Asteroid Belt ◽  
Dynamical Structure ◽  
Orbital Elements ◽  
Mean Motion Resonances ◽  
First Order ◽  
Mean Motion ◽  
Long Time ◽  
The Mean ◽  
Mean Elements ◽  
Asteroid Families

Mean orbital elements are obtained from their instantaneous, osculating counterparts by removal of the short periodic perturbations. They can be computed by means of different theories, analytical or numerical, depending on the problem and accuracy required. The most advanced contemporary analytical theory (Knežević 1988) accounts only for the perturbing effects due to Jupiter and Saturn, to the first order in their masses and to degree four in eccentricity and inclination. Nevertheless, the mean elements obtained by means of this theory are of satisfactory accuracy for majority of the asteroids in the main belt (Knežević et al. 1988), for the purpose of producing large catalogues of mean and proper elements, to identify asteroid families, to assess their age, to study the dynamical structure of the asteroid belt and chaotic phenomena of diffusion over very long time spans. In the vicinity of the main mean motion resonances, however, especially 2:1 mean motion resonance with Jupiter, these mean elements are of somewhat degraded accuracy.

scholarly journals Rodziny uwięzionych i ich miejsce w środowisku lokalnym

2018 ◽  
Vol 11(1)/2018 (11(1)/2018) ◽  
pp. 168-188
Author(s):  
Anna Kieszkowska
Keyword(s):  
Social Relations ◽  
Family Members ◽  
The Family ◽  
Long Time

. Being one of the family members for a long time under conditions of prison isolation becomes a factor that violates, to varying degrees, the family's existing functioning and hinders or disturbs social relations. Separation from the closest relies largely on the behavior of individuals and the functioning of the family as a whole, and in particular prevents other members from fulfilling certain family tasks and roles, although there are painful experiences and lack of positive references to events that took place in the family.

scholarly journals Excluding interlopers from asteroid families

2014 ◽  
Vol 9 (S310) ◽  
pp. 174-175
Author(s):  
Viktor Radović ◽  
Bojan Novaković
Keyword(s):  
Family Members ◽  
New Approach ◽  
The Family ◽  
Asteroid Families

AbstractTo study an asteroid family it is crucial to determine reliably the list of its members, i.e. to reduce the number of interlopers as much as possible. However, as the number of known asteroids increases fast it becomes more and more difficult to obtain robust list of members of an asteroid family. To cope with these challenges we are proposing a new approach that may help to significantly reduce presence of interlopers among the family members.

POLA PENDIDIKAN AGAMA DALAM KELUARGA JAMA’AH TABLIGH DI DESA BOLANG KECAMATAN DAYEUHLUHUR KABUPATEN CILACAP

2019 ◽  
Vol 20 (2) ◽  
pp. 283-298
Author(s):  
Kholid Mawardi ◽  
Cucu Nurzakiyah
Keyword(s):  
Religious Education ◽  
Adult Children ◽  
Daily Activity ◽  
Family Members ◽  
Special Study ◽  
Children's Education ◽  
The Family ◽  
Children’S Education ◽  
The Village

The results of the study found that the responsibility of religious education of children in the family of Tablighi Jama'ah differed in terms of several conditions, namely first, when parents were not going to khuruj where both parents were responsible for children's education; secondly, when the father goes khuruj, then the mother is responsible for everything including children's education; third, when both parents go khuruj, then the responsibility of the child is left to other family members such as grandparents or their first adult children; and fourth, when the child goes to khuruj, where parents are responsible for children's religious education both mother and father. The pattern of the religious education in the Tablighi Jama'ah family in the village of Bolang is formed from several similarities held in the implementation of religious education, one of which is the daily activity that is carried out by the Tablighi Jama'at family. Al-Qur'an becomes one of the material given to children in the ta'lim. Children are taught how to read the Qur'an and memorize short letters such as Surat al-Falaq, al-Ikhlas, and so on. In addition to al-Qur'an, in this ta'lim there is a special study in the Tablighi Jama'ah, which is reading the book of fadhilah ‘amal, and the last is mudzakarah six characteristics.

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