Branch Reconfiguration With Bricard Variations Based on Toroids Intersections: Line-Symmetric Case

Author(s):  
P. C. López-Custodio ◽  
J. S. Dai ◽  
J. M. Rico

This paper for the first time investigates a disintegrated Bricard mechanism in two toroids and reveals their intersection that leads to a set of Bricard variations with various branches of reconfiguration. The discovery is made in the concentric toroid-toroid intersection. By manipulating the construction parameters of the toroids any possible bifurcation point is explored. This casts light on the reconfiguration of these linkages and leads to the common bi-tangent planes that present singularities in the intersection set. The study reveals the presence of Villarceau and secondary circles in the toroids intersection. Therefore, a way to reconfigure the Bricard linkage to two different types of Bennett mechanism is uncovered. Further a linkage with two Bricard and two Bennett motion branches is explored. In addition, the paper reveals the Altmann linkage as a member of this Bricard variation family.

2018 ◽  
Vol 10 (3) ◽  
Author(s):  
P. C. López-Custodio ◽  
J. S. Dai ◽  
J. M. Rico

This paper for the first time investigates a family of line-symmetric Bricard linkages by means of two generated toroids and reveals their intersection that leads to a set of special Bricard linkages with various branches of reconfiguration. The discovery is made in the concentric toroid–toroid intersection. By manipulating the construction parameters of the toroids, all possible bifurcation points are explored. This leads to the common bi-tangent planes that present singularities in the intersection set. The study reveals the presence of Villarceau and secondary circles in the toroid–toroid intersection. Therefore, a way to reconfigure the Bricard linkage to a pair of different types of Bennett linkage is uncovered. Further, a linkage with two Bricard and two Bennett motion branches is explored. In addition, the paper reveals the Altmann linkage as a member of the family of special line-symmetric Bricard linkage studied in this paper. The method is applied to the plane-symmetric case in the following paper published together with this paper.


2019 ◽  
Vol 16 (1-2) ◽  
pp. 143-152
Author(s):  
Ian Campbell

Puisi selatan is a small selection of Sydney poet Ian Campbell’s Indonesian language poems taken from the author’s larger collection titled Selatan-Sur-South of Indonesian language poems - which appeared in PORTAL in 2008 - but now supplemented, for the first time, with English language versions which have been rendered by the poet himself from the ‘starting point’ of these original four Indonesian language poems.   In all there are here now eight poems – four in Indonesian and four in English – with the common thread, for the poet, of being written ‘in the south’. For the poet also, they now interact, across languages, as a set of poems which consider the ways in which the actions of ‘memorialising’ are often intertwined with specific responses to the natural environment.   The poems ‘Semenanjung Bilgola’ and ‘Bilgola headland’ are poems reflecting upon the efforts the poet’s parents made in the late 1960s-early 1970s to restore the natural environment on a headland of one of Sydney’s northern beaches which had been donated to the National Trust. The Indonesian language original poem was read by the poet himself and by Indonesian poets in cities in West Java in 2004 and also at the first Ubud Writers Festival in 2004 by Indonesian female poet, Toeti Heraty,   The poems ‘Berziarah di Punta de Lobos, Chile’ and ‘Pilgrimage to Punta de Lobos’ are also memorialising poems and reflect upon the idea of ’pilgimage’ to a natural location near Pichilemu on the Chilean coast which is popular with surfers. In contrast, the poems ‘Simfoni angin’ and ‘Symphony of the winds’ describe the sights and sounds of a rural area near Purranque in the south of Chile, but here too the poet reflects upon the ways in which present evokes past.   The final poems ‘Buenos Aires’ - rendered as the title in both languages - explore the ways in which the Argentinian café becomes a place in which memories of the city are revealed anew through the processes of inversion of light and shadow, of internal and external shapes and sounds, as if through a camera lens.   Puisi selatan can be rendered in English as ‘poetry of the south’ as all poems derive their impetus from settings in Australia or in Latin America, specifically either Chile or Argentina. They were originally written in Indonesian as part of the poet’s interest in using Bahasa Indonesia as a language of creative writing.  


2015 ◽  
Vol 30 (3) ◽  
pp. 445-476 ◽  
Author(s):  
Jan-Stefan Fritz

For the first time, new sources of minerals are likely to be exploited in the deep seas in an area beyond national jurisdiction. Deep-sea mining encompasses the potential for cooperation and/or competition between the most technologically and economically advanced States and those aspiring to join this group. The community of States recognized this potential early on and signed new treaties, established new international institutions, and promised new levels of cooperation. Most importantly, they also set a standard according to which the exploration for and exploitation of these new resources are to be governed, namely in the context of the Common Heritage of Mankind. This article assesses what progress has been made in the past forty years on defining and implementing the Common Heritage of Mankind as a normative and legal framework for governing the exploration for and exploitation of marine minerals in the deep seas.


2003 ◽  
Vol 3 (1-2) ◽  
pp. 29-34 ◽  
Author(s):  
S.M. Adnan ◽  
T.K. Heng

With the requirement for utilities to be installed in a protected environment at Putrajaya, the new Administrative Centre for the Federal Government of Malaysia, a common utility tunnel has been developed, designed and is currently under construction. The common utility tunnel (CUT) complements the “No Dig” policy of Putrajaya and offers year-round access for inspection and maintenance of utilities laid inside the tunnel. The design of the CUT incorporates features for phased construction of the CUT and installation of utilities. The utilities to be housed inside the CUT are electrical power cables, water pipe, chilled water pipes, gas pipe, multimedia cables and telecommunication cables. This paper discusses the move behind the implementation of the CUT and describes the planning and design of the CUT. This is the first time that an effort has been made in Malaysia to get all the utility providers to agree to have the various utilities in a common tunnel and also on cost-sharing of the capital and maintenance expenditure.


2012 ◽  
Vol 21 (3) ◽  
pp. 75-84
Author(s):  
Venkata Vijaya K. Dalai ◽  
Jason E. Childress ◽  
Paul E Schulz

Dementia is a major public health concern that afflicts an estimated 24.3 million people worldwide. Great strides are being made in order to better diagnose, prevent, and treat these disorders. Dementia is associated with multiple complications, some of which can be life-threatening, such as dysphagia. There is great variability between dementias in terms of when dysphagia and other swallowing disorders occur. In order to prepare the reader for the other articles in this publication discussing swallowing issues in depth, the authors of this article will provide a brief overview of the prevalence, risk factors, pathogenesis, clinical presentation, diagnosis, current treatment options, and implications for eating for the common forms of neurodegenerative dementias.


2011 ◽  
Vol 38 (2) ◽  
pp. 220-228 ◽  
Author(s):  
Spencer G. Sealy ◽  
Mélanie F. Guigueno

For centuries, naturalists were aware that soon after hatching the common cuckoo (Cuculus canorus) chick became the sole occupant of the fosterer's nest. Most naturalists thought the adult cuckoo returned to the nest and removed or ate the fosterer's eggs and young, or the cuckoo chick crowded its nest mates out of the nest. Edward Jenner published the first description of cuckoo chicks evicting eggs and young over the side of the nest. Jenner's observations, made in England in 1786 and 1787, were published by the Royal Society of London in 1788. Four years before Jenner's observations, in 1782, Antoine Joseph Lottinger recorded eviction behaviour in France and published his observations in Histoire du coucou d'Europe, in 1795. The importance of Lottinger's and Jenner's observations is considered together.


2013 ◽  
Vol 61 (3) ◽  
pp. 731-735
Author(s):  
A.W. Stadler ◽  
Z. Zawiślak ◽  
W. Stęplewski ◽  
A. Dziedzic

Abstract. Noise studies of planar thin-film Ni-P resistors made in/on Printed Circuit Boards, both covered with two different types of cladding or uncladded have been described. The resistors have been made of the resistive-conductive-material (Ohmega-Ply©) of 100 Ώ/sq. Noise of the selected pairs of samples has been measured in the DC resistance bridge with a transformer as the first stage in a signal path. 1/f noise caused by resistance fluctuations has been found to be the main noise component. Parameters describing noise properties of the resistors have been calculated and then compared with the parameters of other previously studied thin- and thick-film resistive materials.


2020 ◽  
Vol 54 (2) ◽  
pp. 497-513 ◽  
Author(s):  
L. N. Beldiman ◽  
I. N. Urbanavichene ◽  
V. E. Fedosov ◽  
E. Yu. Kuzmina

We studied in detail a moss-lichen component of Shokalsky Island vegetation for the first time and identified 79 species of mosses and 54 species and 2 subspecies of lichens and lichenicolous fungi. All species of mosses and 23 species and 2 subspecies of lichens and lichenicolous fungi are recorded for the first time for the island. The study is based on collections made in South West part of the island, in arctic tundra. We also explored the participation of the mosses and lichens in the main types of plant communities and the species distribution in 10 ecotopes. The paper describes the noteworthy findings (Abrothallus parmeliarum, Aongstroemia longipes, Arthonia peltigerea, Caloplaca caesiorufella, Catillaria stereocaulorum, Ceratodon heterophyllus, Lecanora leptacinella, Sphagnum concinnum, S. olafii) and features of bryo- and lichenoflora of Shokalsky Island.


2020 ◽  
Vol 62 ◽  
pp. 32-38
Author(s):  
E. A. Dolmatov ◽  
R. B. Borzayev ◽  
A. N. Shaipov

The results of the study of the duration of the juvenile period of indigenous Chechen willow leaf pear genotypes (Pyrus salicifolia Pall.) are given in connection with the acceleration of the breeding process and the use of selected forms in pear breeding for high precocity. The studies were carried out in 2016-2019 at OOO “Orchards of Chechnya” in accordance with the Agreement on creative cooperation with the Russian Research Institute of Fruit Crop Breeding. The work was carried out in accordance with generally accepted programs and methods. The objects of the study were one-year and two-year-old pear seedlings obtained from sowing seeds of selected dwarf and low-growing local Chechen forms of willow pear (P. salicifolia Pall.), laying fruit buds on annual growths and seedlings of Caucasian pear (P. caucasica Fed.), 20 500 pcs. of each specie. The aim of the research was to study the potential of precocity of willow pear seedlings and to reveal of selected forms with the greatest degree of this trait. Stratified seeds were sown in the sowing department of the OOO “Orchards of Chechnya” production nursery in April, 2017. The seedlings were grown according to the common technology in dryland conditions on the plot with chestnut soil. The first fl owering of plants was noted in the spring, 2019. As a result of the research, for the first time on a large number of the experimental material it was found that in the off spring of the indigenous Chechen willow leaf pear genotypes, the selection of a little more than 2% of seedlings with a very short juvenile period (2 years) was possible. They are of great interest in accelerating the breeding process and in the selection of new pear varieties with high precocity. 20 willow leaf pear genotypes were selected for the further use in breeding for high precocity and as sources of the trait of short juvenile period.


Author(s):  
Vladimir A. Lapin ◽  
Erken S. Aldakhov ◽  
S. D. Aldakhov ◽  
A. B. Ali

For the first time in Almaty full passport of apartment stock of multiapartment building was carried out. The structure of the housing stock was revealed with the allocation of groups of buildings according to structural solutions and assessment of their seismic resistance. Based on the results of certification, quantitative estimates of failure probability values for different types of buildings were obtained. Formulas for estimation of quantitative value of seismic risk are obtained. The number of deaths in the estimated zem-shakes was estimated. The results of the assessments will be used for practical recommendations to reduce risk and expected losses in possible earthquakes.


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