scholarly journals How Far Can One Push the Noble Gases Towards Bonding?: A Personal Account

Molecules ◽  
2019 ◽  
Vol 24 (16) ◽  
pp. 2933 ◽  
Author(s):  
Ranajit Saha ◽  
Gourhari Jana ◽  
Sudip Pan ◽  
Gabriel Merino ◽  
Pratim Kumar Chattaraj
Keyword(s):  
Electron Density ◽  
High Pressures ◽  
Noble Gases ◽  
Activation Barrier ◽  
Covalent Bond ◽  
The Other ◽  
Personal Account ◽  
Covalent Bonds ◽  
Other Hand ◽  
Different Types

Noble gases (Ngs) are the least reactive elements in the periodic table towards chemical bond formation when compared with other elements because of their completely filled valence electronic configuration. Very often, extreme conditions like low temperatures, high pressures and very reactive reagents are required for them to form meaningful chemical bonds with other elements. In this personal account, we summarize our works to date on Ng complexes where we attempted to theoretically predict viable Ng complexes having strong bonding to synthesize them under close to ambient conditions. Our works cover three different types of Ng complexes, viz., non-insertion of NgXY type, insertion of XNgY type and Ng encapsulated cage complexes where X and Y can represent any atom or group of atoms. While the first category of Ng complexes can be thermochemically stable at a certain temperature depending on the strength of the Ng-X bond, the latter two categories are kinetically stable, and therefore, their viability and the corresponding conditions depend on the size of the activation barrier associated with the release of Ng atom(s). Our major focus was devoted to understand the bonding situation in these complexes by employing the available state-of-the-art theoretic tools like natural bond orbital, electron density, and energy decomposition analyses in combination with the natural orbital for chemical valence theory. Intriguingly, these three types of complexes represent three different types of bonding scenarios. In NgXY, the strength of the donor-acceptor Ng→XY interaction depends on the polarizing power of binding the X center to draw the rather rigid electron density of Ng towards itself, and sometimes involvement of such orbitals becomes large enough, particularly for heavier Ng elements, to consider them as covalent bonds. On the other hand, in most of the XNgY cases, Ng forms an electron-shared covalent bond with X while interacting electrostatically with Y representing itself as [XNg]+Y−. Nevertheless, in some of the rare cases like NCNgNSi, both the C-Ng and Ng-N bonds can be represented as electron-shared covalent bonds. On the other hand, a cage host is an excellent moiety to examine the limits that can be pushed to attain bonding between two Ng atoms (even for He) at high pressure. The confinement effect by a small cage-like B12N12 can even induce some covalent interaction within two He atoms in the He2@B12N12 complex.

Reactions of macroions with ester and carboxylic groups of polymers

1987 ◽  
Vol 52 (9) ◽  
pp. 2194-2203
Author(s):  
Miloslav Kučera ◽  
Dušan Kimmer ◽  
Karla Majerová ◽  
Josef Majer
Keyword(s):  
Maleic Anhydride ◽  
Acrylic Acid ◽  
Methyl Methacrylate ◽  
Bond Formation ◽  
Covalent Bond ◽  
The Other ◽  
Poly Methyl Methacrylate ◽  
Other Hand ◽  
Carboxylic Groups ◽  
Poly Acrylic Acid

In the reaction of dianions with poly(methyl methacrylate), only an insignificant amount of insoluble crosslinked product is obtained. If, however, the concentration of grafting dianions approaches that of ester groups, the amount of poly(methyl methacrylate) which may thus be crosslinked becomes quite significant. Dications, too, can bring about crosslinking of only an insignificant number of poly(methyl methacrylate) chains. Carboxylic groups in poly(acrylic acid) react with dianions and dications in an anhydrous medium similarly to ester groups. On the other hand, in the presence of a cocatalytic amount of water dications are more readily bound to carboxylic groups, forming a covalent bond. The relatively highest efficiency was observed in the bond formation between dication and the poly[styrene-alt-(maleic anhydride)], both in an anhydrous medium and in the presence of H2O.

Assessing the Utilization of Automata in Representing Players' Behaviors in Game Theory

Game Theory ◽  
2017 ◽  
pp. 106-119
Author(s):  
Khaled Suwais
Keyword(s):  
Game Theory ◽  
Cellular Automata ◽  
Finite Automata ◽  
The State ◽  
The Other ◽  
Direct Impact ◽  
Complex Environments ◽  
Other Hand ◽  
Different Types ◽  
State Of Art

Representing players' strategies in game theory has a direct impact on the players' performance. The state of art shows that automata are one of the primary techniques used for representing players' strategies and behaviors. In this paper, the author will identify different types of automata and assess their utilization in the field of game theory. Is has been found that finite automata, adaptive automata, and cellular automata are widely adopted in game theory. The utilization of finite automata is found to be limited to represent simpler players' behavior. On the other hand, adaptive automata and cellular automata are intensively applied in complex environments, where the number of interacted players is large and therefore, representing complex behaviors are needed.

scholarly journals Impacts of Land Ownership on the Economic Performance and Viability of Rice Farming in Thailand

Land ◽  
2020 ◽  
Vol 9 (3) ◽  
pp. 71
Author(s):  
Amorn Pochanasomboon ◽  
Witsanu Attavanich ◽  
Akaranant Kidsom
Keyword(s):  
Land Use ◽  
Economic Performance ◽  
Rice Yield ◽  
Land Ownership ◽  
The Other ◽  
Farm Households ◽  
Rice Farming ◽  
Policy Makers ◽  
Other Hand ◽  
Different Types

This article evaluates the impacts of land ownership on the economic performance and viability of rice farming in Thailand, and explores whether they are heterogeneous across different types of farming while using the propensity score matching (PSM) technique. This study categorizes land ownership into two types: full land ownership and weak land ownership. We reveal that full land ownership enhances the rice yield of small and midsize farms, with values of 115.789–127.414 kg/hectare and 51.926–70.707 kg/hectare, respectively. On the other hand, weak land ownership only enhances the rice yield of small farms, with an increased yield of 65.590–72.574 kg/hectare. Full land ownership also helps to reduce the informal debt of small and midsize farms by $16.972–$24.877 per farm and $31.393–$37.819 per farm, respectively. On the other hand, weak land ownership helps to reduce the informal debt of midsize farms, ranging from $36.909 to $44.681 per farm. Therefore, policy makers should encourage small and midsize farm households to adopt full land ownership instead of weak land ownership, as this will provide the greatest benefits to farm households and efficient land use.

scholarly journals THE CULTIVATION OF TRICHOMONAS OF THE HUMAN MOUTH (TETRATRICHOMONAS HOMINIS)

1917 ◽  
Vol 25 (2) ◽  
pp. 341-347 ◽  
Author(s):  
Tokuzo Ohira ◽  
Hideyo Noguchi
Keyword(s):  
Cultural Studies ◽  
Cell Body ◽  
Trichomonas Vaginalis ◽  
The Body ◽  
The Other ◽  
Other Hand ◽  
Deep Groove ◽  
Different Types ◽  
The Difference

Trichomonades from the mouth were studied by Steinberg who proposed to group them into three distinct types; namely, Trichomonas elongata, Trichomonas caudata, and Trichomonas flagellata. Doflein (3) regards them as probably identical with Trichomonas hominis. Opinions differ as to whether or not Trichomonas vaginalis Donné and Trichomonas hominis Grassi are the same species. Lynch, for instance, believes that they are the same species, while von Prowazek (4), Bensen (5), and others (6, 7) insist that they are different types. Bensen's view seems to be well supported by the difference alleged to be found between the mode of encystment in the two trichomonades, were it not for the fact that our knowledge about the so called cyst of trichomonades is still obscure. According to Alexeieff (8) many of the so called cysts were evidently blastomyces contained in the cell body of the trichomonas. An autogamy alleged to take place in cysts as described by Bohne and von Prowazek (9) has not been confirmed by Dobell (10). And Wenyon (11) contends that it has never been found possible to produce any development of these cysts outside the body on the warm stage as can be done with the cysts of Entamœba coli. Therefore, it is still premature to take the process of encystment into consideration as far as the classification of trichomonas is concerned. On the other hand, Rodenwaldt (12) seems to think that there are many species of trichomonas in the human intestines, and Wenyon has described a new trichomonas from the human intestines (Macrostoma mesnili Wenyon). Further cultural studies in the morphology and biology of these organisms must be carried out in order to solve these problems. In the light of modern investigations there are five subgenera to be included under the genus Trichomonas Donné. They are as follows: (1) Protrichomonas Alexeieff, with three anterior flagella, without an undulating membrane. (2) Trichomastix Biitschli) with three anterior flagella and a trailing flagellum (Schleppgeissel) without an undulating membrane. (3) Trichomonas Donné, with three anterior flagella and an undulating membrane. (4) Macrostoma Alexeieff, Amend, Wenyon (11), with three anterior flagella and an undulating membrane wedged in a deep groove (peristome). (5) Tetratrichomonas Parisi (13), with four anterior flagella and an undulating membrane. As far as our culture trichomonas from the human mouth is concerned, it has been shown that it is not strictly a trichomonas and that it should be classed under the subgenus Tetratrichomonas.

OPTIMIZATION OF PARAMETRIC YIELD: A TUTORIAL

1992 ◽  
Vol 03 (01) ◽  
pp. 95-136 ◽  
Author(s):  
STEPHEN W. DIRECTOR ◽  
PETER FELDMANN ◽  
KANNAN KRISHNA
Keyword(s):  
Manufacturing Process ◽  
Yield Loss ◽  
The Other ◽  
Parametric Yield ◽  
Other Hand ◽  
Different Types

Yield loss can be characterized as either catastrophic or parametric. Catastrophic yield loss is primarily due to local disturbances, such as spot defects, that occur in a manufacturing process. On the other hand, parametric yield loss is due to global disturbances, such as mask misalignment. In this paper we briefly explore these two different types of yield loss and then review some methods that have been developed to maximize parametric yield.

scholarly journals Bayesian over-dispersed Poisson model and the Bornhuetter & Ferguson claims reserving method

2012 ◽  
Vol 6 (2) ◽  
pp. 258-283 ◽  
Author(s):  
Peter D. England ◽  
Richard J. Verrall ◽  
Mario V. Wüthrich
Keyword(s):  
Poisson Model ◽  
The Other ◽  
Prior Distributions ◽  
Prediction Uncertainty ◽  
General Insurance ◽  
Other Hand ◽  
Different Types ◽  
Chain Ladder ◽  
The One ◽  
Classical Chain

AbstractWe consider the Bayesian over-dispersed Poisson (ODP) model for claims reserving in general insurance. We choose two different types of prior distributions for the parameters and then study the different Bayesian predictors. This study leads, on the one hand, to the classical chain ladder predictor and, on the other hand, to Bornhuetter & Ferguson predictors. We highlight (either analytically or numerically) how these predictors are obtained and how their prediction uncertainty can be determined.

The diversity of inflectional periphrasis in Persian

2014 ◽  
Vol 51 (2) ◽  
pp. 327-382 ◽  
Author(s):  
OLIVIER BONAMI ◽  
POLLET SAMVELIAN
Keyword(s):  
General Framework ◽  
Point Of View ◽  
The Other ◽  
Inflectional Morphology ◽  
Formal Grammar ◽  
Conjugation System ◽  
Testing Ground ◽  
Other Hand ◽  
Different Types ◽  
A Cell

Modern Persian conjugation makes use of five periphrastic constructions with typologically divergent properties. This makes the Persian conjugation system an ideal testing ground for theories of inflectional periphrasis, since different types of periphrasis can be compared within the frame of a single grammatical system. We present contrasting analyses of the five constructions within the general framework of a lexicalist constraint-based grammatical architecture (Pollard & Sag 1994) embedding an inferential and realizational view of inflectional morphology (Stump 2001). We argue that the perfect periphrase can only be accounted for by assuming that the periphrase literally fills a cell in the inflectional paradigm, and provide a formal account drawing on using valence for exponence. On the other hand, other periphrastic constructions are best handled by using standard tools of either morphology or syntax. The overall conclusion is that not all constructions that qualify as periphrastic inflection from the point of view of typology should receive the same type of analysis in an explicit formal grammar.

Geometric Synthesis and Enumeration of the Family of 3-DOF Translational Parallel Manipulators via the Screw Theory

2004 ◽  
Author(s):  
Jingjun Yu ◽  
Shusheng Bi ◽  
Guanghua Zong ◽  
Yuefa Fang
Keyword(s):  
Screw Theory ◽  
Parallel Manipulators ◽  
The Other ◽  
Systematic Method ◽  
Symmetrical Structure ◽  
Geometric Conditions ◽  
Other Hand ◽  
Asymmetrical Structure ◽  
The Family ◽  
Different Types

In this paper, a systematic method based on the screw theory is proposed for the geometric synthesis of a family of 3-DoF translational parallel manipulators (TPMs). The theory of screws and reciprocal screws is employed for the analysis of the geometric conditions undergoing the different types of constraints for the TPMs. In terms of these established geometric conditions, limb structures that can be used for constructing TPMs are enumerated, and a number of novel TPMs including both symmetrical structure and asymmetrical structure are synthesized accordingly. On the other hand, some composite kinematic pairs are proposed. The involvement of these composite kinematic pairs into the limbs of a TPM greatly enlarges the family of the TPMs.

scholarly journals The Role of Memory in the Perception of the Screen Image

2012 ◽  
Vol 4 (2-3) ◽  
pp. 96-105
Author(s):  
Vitaly Fyodorovich Poznin
Keyword(s):  
Human Memory ◽  
The Other ◽  
Screen Image ◽  
Other Hand ◽  
Different Types ◽  
Long Time ◽  
Short Time ◽  
Artistic Image ◽  
Psychology Of Art

The article investigates one of the aspects of psychology of art, namely, the role of different types of human memory — sensory, long-time, short-time — in the forming of an artistic image in the perception of an audiovisual entity. The audience’s perception of such specific cinematic methods as pan shot and dolly shot, as well as different types of parallel, associative and distance montage rests on the peculiarities of our short-time and long-time memory. On the other hand, the complex polyphonic combination of various visual chronotopes in modern films is based on the imitation of memory typical for our dreams.

scholarly journals (Non)epistemic modality: English must, have to and have got to and their correspondences in Lithuanian

Kalbotyra ◽  
2017 ◽  
Vol 69 (69) ◽  
pp. 223
Author(s):  
Audronė Šolienė
Keyword(s):  
Qualitative Methods ◽  
Epistemic Modality ◽  
The Other ◽  
Modal Verbs ◽  
Other Hand ◽  
Different Types ◽  
Deontic Modality ◽  
Quantitative And Qualitative Methods

This paper deals with the three types of modality – epistemic, deontic and dynamic. It examines the relation between the synchronic uses of the modal auxiliary must and the semi-modals have to and have got to as well as their Lithuanian translation correspondences (TCs) found in a bidirectional translation corpus. The study exploits quantitative and qualitative methods of research. The purpose is to find out which type of modality is most common in the use of must, have to and have got to; to establish their equivalents in Lithuanian in terms of congruent or non-congruent correspondence (Johansson 2007); and to determine how Lithuanian TCs (verbs or adverbials) correlate with different types of modality expressed. The analysis has shown that must is mostly used to convey epistemic nuances, while have to and have got to feature in non-epistemic environments. The findings show that must can boast of a great diversity of TCs. Some of them may serve as epistemic markers; others appear in deontic domains only. Have (got) to, on the other hand, is usually rendered by the modal verbs reikėti ‘need’ and turėti ‘must/have to’, which usually encode deontic modality.

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