scholarly journals A note on dynamical compensation and its relation to parameter identifiability

2017 ◽  
Author(s):  
Omer Karin ◽  
Uri Alon ◽  
Eduardo Sontag

AbstractWe recently identified a motif for dynamical compensation (DC) – a property where a system maintains the dynamics and steady-state of a regulated variable robust in the face of fluctuations in key parameters. Such parameters are therefore unidentifiable from measurements of the regulated variable at steady-state. On the other hand, since the models showing dynamical compensation are typically non-redundant, their parameters are identifiable from experimental data. We clarify this apparent discrepancy by requiring that the parameters of DC circuits be identifiable both away from steady-state and when measuring other system variables. We use this observation to provide a definition for DC in terms of parameter identifiability and discuss its relevance for the examples provided in Karin et al.

Imbizo ◽  
2020 ◽  
Vol 11 (2) ◽  
Author(s):  
Naomi Epongse Nkealah ◽  
Olutoba Gboyega Oluwasuji

Ideas of nationalisms as masculine projects dominate literary texts by African male writers. The texts mirror the ways in which gender differentiation sanctions nationalist discourses and in turn how nationalist discourses reinforce gender hierarchies. This article draws on theoretical insights from the work of Anne McClintock and Elleke Boehmer to analyse two plays: Zintgraff and the Battle of Mankon by Bole Butake and Gilbert Doho and Hard Choice by Sunnie Ododo. The article argues that women are represented in these two plays as having an ambiguous relationship to nationalism. On the one hand, women are seen actively changing the face of politics in their societies, but on the other hand, the means by which they do so reduces them to stereotypes of their gender.


2011 ◽  
Vol 78 (2) ◽  
pp. 165-174 ◽  
Author(s):  
C. L. XAPLANTERIS ◽  
E. D. FILIPPAKI ◽  
I. S. MISTAKIDIS ◽  
L. C. XAPLANTERIS

AbstractMany experimental data along with their theoretical interpretations on the rf low-temperature cylindrical plasma have been issued until today. Our Laboratory has contributed to that research by publishing results and interpretative mathematical models. With the present paper, two issues are being examined; firstly, the estimation of electron drift caused by the rf field gradient, which is the initial reason for the plasma behaviour, and secondly, many new experimental results, especially the electron-neutral collision frequency effect on the other plasma parameters and quantities. Up till now, only the plasma steady state was taken into consideration when a theoretical elaboration was carried out, regardless of the cause and the effect. This indicates the plasma's complicated and chaotic configuration and the need to simplify the problem. In the present work, a classification about the causality of the phenomena is attempted; the rf field gradient electron drift is proved to be the initial cause.


1876 ◽  
Vol 22 (98) ◽  
pp. 196-201 ◽  
Author(s):  
T. Claye Shaw

There is a general idea expressed in text-books, and more or less freely asserted in practice, but which I shall prove to be a fallacy, that a high-arched palate is so frequently met with in idiocy and imbecility that it may be taken as a sign of their existence. Indeed, when a case of this kind is brought forward the patient is made to open his mouth, under the conviction that a high palate will be found as certainly as a superficial alteration of the tongue in gastric disturbance. We shall see that the connection is an accidental one; and there is, in reality, no relationship between the development of the intellect and the height and width of the palate. If we consider that the bones of the cranium are developed in a different manner from those of the face, and that ossification at the base is complete long before that of the bones forming the palate, it is clear that there can be no primâ facie reason for thinking that because a person has an imperfect brain he should therefore have an imperfect palate; yet such an interdependence is held. It is quite true that a constitutional taint, such as rickets or syphilis, which affects the ossification of the bones generally and the cranial sutures, would probably affect the palatine bones, and hence it is that many idiots and imbeciles are found to have high or imperfect palates: but on the other hand some modifying taint may dwarf the height of the body, may affect the shape of the head to such an extent as to make an idiot of the microcephalic type, and yet leave the palate untouched, perfect in all conditions of width, height, number, quality, and regularity of teeth.


JURTEKSI ◽  
2021 ◽  
Vol 7 (2) ◽  
pp. 133-142
Author(s):  
Alwin Fau ◽  
Fince Tinus Waruwu

Abstract: In today's technological developments, digital images are a medium that is often used to store a person's identity. Digital images are currently widely used for data security needs. On the other hand, images can also be used as a medium for tapping data. Today's digital media provide many things in manipulating and changing the information contained in these images. In this study, the authors conducted a study to examine similarities in digital images so that it could be seen whether the information was authentic or not. detecting image similarities can help find out information whether the image is the same as the original object or not. The method used in this research is the Eigen Face method. The face eigen method is a method that can be used to check and match the similarities of an image. With the eigenface value, Figure 1, Figure 2, Figure 3, it can be determined that with other eigenface values can be determined based on the eigenface matrix values obtained from each image. Based on the values obtained from Figures 1, 2, and 3, it can be concluded that the eigenface method is able to present facial similarities with a presentation value of 80%.            Keywords: Eigenface; Face Recognation; Images; Images Processing  Abstrak: Dalam perkembangan teknologi saat ini, gambar digital merupakan media yang sering digunakan untuk menyimpan identitas seseorang. Gambar digital saat ini banyak digunakan untuk kebutuhan keamanan data. di sisi lain, gambar juga dapat digunakan sebagai media penyadapan data. Media digital saat ini menyediakan banyak hal dalam memanipulasi dan mengubah informasi yang terdapat pada gambar tersebut. Dalam penelitian ini penulis melakukan penelitian untuk menelaah kemiripan pada citra digital sehingga dapat diketahui apakah informasi tersebut otentik atau tidak. Mendeteksi kemiripan citra dapat membantu mengetahui informasi apakah citra tersebut sama dengan objek aslinya atau tidak. Metode yang digunakan dalam penelitian ini adalah metode Eigen Face. Metode eigen wajah merupakan metode yang dapat digunakan untuk mengecek dan mencocokkan kemiripan suatu citra. Dengan nilai eigenface, Gambar 1, Gambar 2, Gambar 3, dapat ditentukan bahwa dengan nilai eigenface lainnya dapat ditentukan berdasarkan nilai matriks eigenface yang diperoleh dari masing-masing citra. Berdasarkan nilai yang diperoleh dari Gambar 1, 2, dan 3, dapat disimpulkan bahwa metode eigenface mampu menghadirkan kemiripan wajah dengan nilai presentasi 80%.. Kata kunci: Citra; Eigenface; Pengolahan Citra Digital; Pengenalan Wajah


2012 ◽  
Vol 10 (06) ◽  
pp. 1250073
Author(s):  
JIAN-FENG AI ◽  
JIAN-SONG ZHANG ◽  
AI-XI CHEN

We investigate the transfer of bipartite (measured by cocurrence) and multipartite (measured by global discord) quantum correlations though spin chains under phase decoherence. The influence of phase decoherence and anisotropy parameter upon quantum correlations transfer is investigated. On the one hand, in the case of no phase decoherence, there is no steady state quantum correlations between spins. On the other hand, if the phase decoherence is larger than zero, the bipartite quantum correlations can be transferred through a Heisenberg XXX chain for a long time and there is steady state bipartite entanglement. For a Heisenberg XX chain, bipartite entanglement between two spins is destroyed completely after a long time. Multipartite quantum correlations of all spins are more robust than bipartite quantum correlations. Thus, one can store multipartite quantum correlations in spin chains for a long time under phase decoherence.


1903 ◽  
Vol 3 (9-10) ◽  
pp. 548-549
Author(s):  
E. Board

Lung surgery is one of the youngest departments of surgical science. The basis for the development of methods of operative intervention in pulmonary diseases lies in the 1st possibility of preventing the danger of pneumothorax, which (danger) is currently so insignificant that some surgeons consider it even necessary to cause preliminary pneumothorax. On the other hand, the experimental data have shown the possibility of the loss of parts of the lung tissue and the conditions for the healing of its wounds.


2010 ◽  
Vol 2010 ◽  
pp. 1-6 ◽  
Author(s):  
Yih-Sheng Huang ◽  
Sheng-Haur Yu ◽  
Yea-Ru Sheu ◽  
Kuo-Shien Huang

This experiment aims to produce a free radical while annoying the oxidizing-reducing reagent of the ammonium persulfate and the sodium bisulfite under nitrogen, then trigger copolymerization between modified-mica and chitosan to prepare a variety of copolymers. This experiment also aims to study the related properties of these copolymer materials. The experimental data shows that the copolymer has more thermal stability and better absorption of UV than chitosan. But the above physical properties will be less if the mica ratio in copolymer is more than 8%. On the other hand, the SEM photo of the microstructure also shows that the modified mica distributes homogeneously on the surface of the film of the copolymer.


1960 ◽  
Vol 1 (2) ◽  
pp. 1-19 ◽  
Author(s):  
D. K. Bassett

On 27 February, 1623, Gabriel Towerson, the chief factor or merchant of the English East India Company in Amboyna, was beheaded by command of the local Dutch governor, Herman van Speult. Nine other Englishmen, ten Japanese and one Portuguese shared Towerson's fate. The charges brought against these unfortunate men were that they planned to kill Speult and overwhelm the Dutch garrison of Fort Victoria as soon as an English ship appeared in the roadstead to support them. It is not the purpose of the present article to re-open the more controversial aspects of the Amboyna tragedy. Suffice it to say that the plausibility of the Dutch accusation has never commanded much respect in the estimate of British historians and it is unlikely that this attitude will change. On the other hand, there is every evidence to suggest that Speult, despite English suspicions to the contrary, was genuinely convinced that an English plot was afoot to overthrow his government. Normally the governor was a humane and reasonable man, who had received Towerson at his table on many occasions, and his bitterness at the strange turn of events in February, 1623, is very understandable. Dr. Stapel has recorded the reputed reply of Towerson to Speult when the latter upbraided him for thus abusing his hospitality and friendship: “Alas! If it were to beginne againe, it should never be done”. Is this the response of a man who knew he was innocent? asks Dr. Stapel. On the face of it, Towerson would appear to be condemned by his own words, but it must be remembered that his physical condition at that time was pitiful. He had firmly protested his innocence under prolonged and severe torture until his powers of endurance were broken, after which he sought relief, presumably, by telling the Dutch what they wanted to hear. In these circumstances, it is difficult to attach to Towerson's rather cryptic expression of repentance the importance it would otherwise deserve.


Author(s):  
Marla Morris

Curriculum means complex relations between teachers and students. Discourse on health and illness involves these relations. Health and illness are phenomenological states of being that can be fragile. Health might mean longevity, while illness could mean finality. It is not so clear, though, where health slips into illness. Illness can return in a circular fashion. So the line between health and illness is not entirely clear. When illness strikes, people’s narratives get interrupted; these narratives embody our identities. Narratives are stories that we tell ourselves. Narratives such as autobiography and biography have a long history in curriculum studies. In this field, autobiographies and biographies of teachers have historically been about happy occasions, occasions of triumph, and happy endings. Narratives of critical illness—which few curriculum scholars have dealt with—are without happy endings. Critical illness narratives concern grief, loss, and unhappy endings. Grief, bereavement, and melancholy have no timeline, no frame of reference, and sometimes no ending at all. Curriculum scholars have written about melancholy in mental illness but have not written much about it in the face of physical illness. During times of illness, some turn to the spiritual, some turn away. The spiritual can be put to use either to better understand endings or to avoid endings and deny what is happening. For some, avoidance helps the journey along. For others, facing head-on the catastrophe at hand becomes necessary. For those who slip from health into illness, radical Otherness is at hand. Being very sick isolates. Alterity, then, is key when thinking about such experiences. A phenomenology of alterity is key when thinking about health and illness. Chronic illness differs from a sudden onset of illness. People can be relatively healthy and yet suffer from chronic illness. People can be, on the other hand, very sick with chronic illness for many years. Some chronic illnesses are invisible. Grief over invisible illnesses tends not to be taken seriously by others because the illness is not visible. On the other hand, if there are physical symptoms that others can see, grief over that illness tends to be taken more seriously by others than illnesses which are invisible. Curriculum, or lived experience, is about health and illness because this is life’s trajectory. One cannot become educated in a disembodied way. Education happens in bodies that exist on a continuum between health and illness.


2020 ◽  
Vol 21 (18) ◽  
pp. 6510
Author(s):  
Alexandre A. de Castro ◽  
Daniel A. Polisel ◽  
Bruna T. L. Pereira ◽  
Elaine F. F. da Cunha ◽  
Kamil Kuca ◽  
...  

Organophosphorus (OP) compounds are used as both chemical weapons and pesticides. However, these agents are very dangerous and toxic to humans, animals, and the environment. Thus, investigations with reactivators have been deeply developed in order to design new antidotes with better efficiency, as well as a greater spectrum of action in the acetylcholinesterase (AChE) reactivation process. With that in mind, in this work, we investigated the behavior of trimedoxime toward the Mus musculus acetylcholinesterase (MmAChE) inhibited by a range of nerve agents, such as chemical weapons. From experimental assays, reactivation percentages were obtained for the reactivation of different AChE–OP complexes. On the other hand, theoretical calculations were performed to assess the differences in interaction modes and the reactivity of trimedoxime within the AChE active site. Comparing theoretical and experimental data, it is possible to notice that the oxime, in most cases, showed better reactivation percentages at higher concentrations, with the best result for the reactivation of the AChE–VX adduct. From this work, it was revealed that the mechanistic process contributes most to the oxime efficiency than the interaction in the site. In this way, this study is important to better understand the reactivation process through trimedoxime, contributing to the proposal of novel antidotes.


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