Готові списки джерел за темами / Operators of small groups

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Добірка наукової літератури з теми "Operators of small groups"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 19 липня 2025

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Статті в журналах з теми "Operators of small groups"

Nadjafikhah, M., and A. Mokhtary. "Approximate Hamiltonian Symmetry Groups and Recursion Operators for Perturbed Evolution Equations." Advances in Mathematical Physics 2013 (2013): 1–9. http://dx.doi.org/10.1155/2013/568632.

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The method of approximate transformation groups, which was proposed by Baikov et al. (1988 and 1996), is extended on Hamiltonian and bi-Hamiltonian systems of evolution equations. Indeed, as a main consequence, this extended procedure is applied in order to compute the approximate conservation laws and approximate recursion operators corresponding to these types of equations. In particular, as an application, a comprehensive analysis of the problem of approximate conservation laws and approximate recursion operators associated to the Gardner equation with the small parameters is presented.

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Möllers, Jan, and Benjamin Schwarz. "Bessel operators on Jordan pairs and small representations of semisimple Lie groups." Journal of Functional Analysis 272, no. 5 (2017): 1892–955. http://dx.doi.org/10.1016/j.jfa.2016.10.026.

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Jyoti, J., Lalit Vashisht, and Uttam Sinha. "Matrix-valued Gabor frames over LCA groups for operators." Filomat 37, no. 28 (2023): 9543–59. http://dx.doi.org/10.2298/fil2328543j.

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G?vruta studied atomic systems in terms of frames for range of operators (that is, for subspaces), namely ?-frames, where the lower frame condition is controlled by the Hilbert-adjoint of a bounded linear operator?. For a locally compact abelian groupGand a positive integer n, westudy frames of matrix-valued Gabor systems in the matrix-valued Lebesgue space L2(G,Cn?n) , where a bounded linear operator ? on L2(G,Cn?n) controls not only lower but also the upper frame condition. We term such frames matrix-valued (?,?*)-Gabor frames. Firstly, we discuss frame preserving mapping in terms of hyponormal operators. Secondly, we give necessary and sufficient conditions for the existence of matrix-valued (?,?*)- Gabor frames in terms of hyponormal operators. It is shown that if ? is adjointable hyponormal operator, then L2(G,Cn?n) admits a ?-tight (?,?*)-Gabor frame for every positive real number ?. A characterization of matrix-valued (?,?*)-Gabor frames is given. Finally, we show that matrix-valued (?,?*)-Gabor frames are stable under small perturbation of window functions. Several examples are given to support our study.

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Badea, Catalin, Vincent Devinck, and Sophie Grivaux. "Escaping a Neighborhood Along a Prescribed Sequence in Lie Groups and Banach Algebras." Canadian Mathematical Bulletin 63, no. 3 (2019): 484–505. http://dx.doi.org/10.4153/s0008439519000560.

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AbstractIt is shown that Jamison sequences, introduced in 2007 by Badea and Grivaux, arise naturally in the study of topological groups with no small subgroups, of Banach or normed algebra elements whose powers are close to identity along subsequences, and in characterizations of (self-adjoint) positive operators by the accretiveness of some of their powers. The common core of these results is a description of those sequences for which non-identity elements in Lie groups or normed algebras escape an arbitrary small neighborhood of the identity in a number of steps belonging to the given sequence. Several spectral characterizations of Jamison sequences are given, and other related results are proved.

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Zeffane, Rachid. "Gender, individualism–collectivism and individuals’ propensity to trust: A comparative exploratory study." Journal of Management & Organization 26, no. 4 (2017): 445–59. http://dx.doi.org/10.1017/jmo.2017.57.

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AbstractWe explore the impact of gender, individualism–collectivism on individual’s propensity to trust. The study draws on data from three groups of individuals in the United Arab Emirates: students; (n=370); small business owners/operators (n=324), and employed individuals (n=376). Three main hypotheses are tested. We develop and explore three main hypotheses. Statistical results reveal that females are generally more collectivist and less trusting than their males counterparts. Further analysis revealed that small business/operators are generally more trusting than the other cohorts of respondents. Propensity to trust was also found to be strongly associated with collectivist (rather than individualist) aspirations. Implications for future research and management practice are discussed.

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Haavik, Kjetil E. "Extended use of receiver groups: Theory, synthetic example, and noise considerations." GEOPHYSICS 85, no. 6 (2020): P53—P66. http://dx.doi.org/10.1190/geo2019-0624.1.

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Receiver grouping is commonly used in marine towed-streamer seismic acquisition. Measurements from several receivers in a group are stacked to increase the signal-to-noise ratio of the resulting data and form an analog spatial antialiasing filter. I propose a method for extracting inline derivatives of the wavefield as additional measurements from the groups. This is achieved by multiplying the signal from the individual receivers in a group with predefined weights that corresponds to a finite-difference (FD) operator. The inline derivative(s) makes it possible to use multichannel sampling theorems to reconstruct the signal on a denser grid. Extraction of FD data from clusters of receivers is not a new concept, but I find that, by using the geometry of conventional streamer groups, it is possible to obtain FD data which are well suited for multichannel interpolation. The key to finding suitable FD operators is to recognize that it is not the ideal differentiation response we seek, but the impulse response of the group multiplied with the ideal differentiation response. Furthermore, under a Gaussian noise assumption, I derive formulas for the resulting noise level from sinc and higher order sinc interpolations. I find that the random noise level in the reconstructed data, when using higher order sinc interpolation, is expected to be higher than when using conventional sinc interpolation and will vary with respect to the distance from the original sampling points. The statistical analysis shows that it is beneficial to find FD operators with as small an [Formula: see text] norm as possible. A synthetic example shows that the proposed method of extracting FD operators and subsequent interpolation works very well. I foresee that the proposed method can be used to reduce the density of receivers (hydrophones or geophones) when designing new streamers or with existing equipment to improve the inline sampling.

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Barton, Susan S., Jo Mercer, and Charles J. Molnar. "Using Focus Groups to Determine Market Potential for Wildflower Sod." HortTechnology 6, no. 3 (1996): 271–76. http://dx.doi.org/10.21273/horttech.6.3.271.

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Two focus-group sessions were conducted to determine the market potential of a new horticultural product—wildflower sod. One session included homeowners with suburban lots and an interest in wildflowers. Another session included landscape professionals, property managers, and garden center operators. Participants viewed a slide presentation about the uses of wildflowers and wildflower sod, a videotape illustrating wildflower sod installation, and a demonstration plot planted with wildflower sod. The discussion was conducted by an unbiased facilitator. Participants cited the instant effect of wildflower sod as a major advantage. The price was viewed as acceptable for small areas, especially if sod was broken apart and spaced as plugs. Comments from the participants were used to develop an ideal product description and yielded merchandising recommendations.

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Duglio, Bonadonna, Letey, Peira, Zavattaro, and Lombardi. "Tourism Development in Inner Mountain Areas—The Local Stakeholders’ Point of View through a Mixed Method Approach." Sustainability 11, no. 21 (2019): 5997. http://dx.doi.org/10.3390/su11215997.

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Tourism in inner areas, especially in the mountains, is a complex phenomenon due to the different tourist’s needs and to the specific local features that vary considerably from one destination to another. Consequently, a unique tourism development strategy cannot be defined and adopted anywhere. When considering tourism-based territorial development in mountain areas, it is crucial to take the vision of local stakeholders into consideration. To drive different and/or unexpressed opinions towards shared tools, this study analyses the local stakeholder’s point of view using a mixed method consisting of a Delphi method followed by a Group Nominal Technique. The research was performed in Soana Valley, a small mountain community in the Northwestern Italian Alps. It involved 17 local stakeholders divided into three main groups—local administrators (n = 3), hospitality operators (9) and retailers (5). Results show how operators converge on three common aspects—local food product offering, territorial promotion and collaboration among operators, on which the community should focus to build a territorial integrated tourism offering.

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Erta, Erta. "The Experiential Marketing, Experience Engagement, Reference Group, and Customer Satisfaction Toward Purchase Intention of Virtual Hotel Operators (VHO): Indonesian Context." International Journal of Multidisciplinary Research and Analysis 05, no. 10 (2022): 2740–54. http://dx.doi.org/10.47191/ijmra/v5-i10-23.

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Budget traveling has developed to become a potential niche market in the hospitality industry as an increasing number of backpackers and domestic tourists with limited disposable income. This niche market has grown to become a multi-billion dollar market globally as its ability to develop the economy through more job opportunity, enforce small accommodation service with low overhead-cost and shift local product increase of destination country such as Virtual Hotel Operators (VHO). This business model provides rented accommodation in which services are accessible on the official website and mobile application. As a marketplace, it enables guest and hotel operators to meet, deal, and finalize accommodation booking transactions online. This study analyzes the influence of experiential marketing, experience engagement, reference group and customer satisfaction on repurchase intention of VHO consumers. The result shows a positive relationship between experiential marketing, experience engagement, VHO consumer reference groups, customer satisfaction, and purchase intention. These results support previous research investigating a so-called "experience profile," which consumer summarize and evaluate memory experiences by combining their sequential experiences received by their senses which provided by company’s experiential marketing channels.

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Korsun, O. N., and E. I. Mikhaylov. "Identification of the Pilot as Part of the Crew Using Speech Spectral Transfer Function." Herald of the Bauman Moscow State Technical University. Series Instrument Engineering, no. 5 (128) (October 2019): 35–48. http://dx.doi.org/10.18698/0236-3933-2019-5-35-48.

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The paper deals with the problem of voice identification of the pilot as part of the crew, which is one of the ways to improve the interface of the cockpit of a modern aircraft. The main trends of pilot voice identification in the task of improving the cockpit interface are voice control of onboard equipment and accident investigation. We introduce a method for identifying the speakers personality using the speakers voice transfer function by frequency and the k-nearest neighbors data classification algorithm. Due to the nature of the task, identification was carried out for small groups of operators of up to four people. The main results of testing the proposed method on the experimental speech data that include 3 and 20 different isolated words are given. Findings of research show that the operator can be identified by a small number of code words with an accuracy of about 97--99 % when using the speakers voice transfer function by frequency. The paper also presents a comparison of the results of applying the methodology for pilots of helicopter aviation with the diagnosis of hearing loss and for a group of operators without diseases of the organs of hearing.

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Дисертації з теми "Operators of small groups"

Панфілов, Юрій Іванович. "Психологічні основи забезпечення ефективності спільної діяльності операторів військ протиповітряної оборони". Thesis, Українська інженерно-педагогічна академія, 2007. http://repository.kpi.kharkov.ua/handle/KhPI-Press/18362.

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Дисертація на здобуття наукового ступеня кандидата психологічних наук за фахом 19.00.03 – психологія праці, інженерна психологія. – Українська інженерно-педагогічна академія, Харків, 2007. Дисертація присвячена проблемі психологічного забезпечення ефективності спільної діяльності операторів з урахуванням психологічної сумісності. В дисертації проаналізовані основні науково-теоретичні підходи до визначення взаємозв’язку ефективності спільної діяльності і сформованої психологічної сумісності, які включали: структурний, функціональний і адаптивний підходи. Більш конкретно визначена структура психологічної сумісності та її значущі компоненти. В роботі аналізується діяльність операторів військ Протиповітряної оборони, які виконують завдання бойового чергування, представлена професіограма спеціальностей радіотехнічного та зенітно-ракетного профілю, в яких відображені психологічні вимоги до цих спеціальностей та встановлені професійно важливі якості операторів, сформованість яких дозволяє підвищити ефективність їхньої спільної діяльності. Визначені і згруповані внутрішні і зовнішні фактори, які впливають на ефективність спільної діяльності. В ході дослідження встановлено комплекс критеріїв кожного компонента психологічної сумісності, їх рівні, динаміка та умови формування. Визначені основні причини психологічної несумісності. Суб'єктам керівництва військових підрозділів розроблена і запропонована методика психологічного забезпечення ефективності спільної діяльності з урахуванням психологічної сумісності операторів.<br>Dissertation on the scientific degree of candidate of psychological sciences on speciality 19.00.03 – рsychology of labour, engineering psychology. – Ukrainian еngineering-рedagogical аcademy, Kharkov, 2007. Dissertation is devoted to the problem of the socially-psychological providing of the efficiency of the joint activity of operators taking into account psychological compatibility. In dissertation found out basic theoretical-conceptual approaches to the study of intercommunication of the joint activity and the problem of psychological compatibility, which include: structural, functional and adaptive approaches. The structure of psychological compatibility and its copulas with the effective joint activity is specified. Description of the activity of operators of Air defense troops, which execute the commons tasks, is given in the work, represented psychodrama requirements to necessary qualities of operators, purposeful influence on which allows to promote efficiency of their joint activity. The stress - factors, which influence on efficiency of joint activity are definite is grouped. They are separated into external and internal (psychological and socially-psychological). During the research certain meaningful components of psychological compatibility, their criteria levels and forming dynamics. Certain principal reasons of psychological incompatibility. As a result of the conducted research to the subjects of guidance of military subsections the special psychological methodic providing of the efficiency of joint activity taking into account psychological compatibility of operators was offered.

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He, Zhiping. "Spectra of localization operators on groups." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0024/NQ39271.pdf.

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Venieri, Laura. "Hypoelliptic differential operators in Heisenberg groups." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amslaurea.unibo.it/5634/.

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Gaebler, David. "Toeplitz Operators on Locally Compact Abelian Groups." Scholarship @ Claremont, 2004. https://scholarship.claremont.edu/hmc_theses/163.

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Given a function (more generally, a measure) on a locally compact Abelian group, one can define the Toeplitz operators as certain integral transforms of functions on the dual group, where the kernel is the Fourier transform of the original function or measure. In the case of the unit circle, this corresponds to forming a matrix out of the Fourier coefficients in a particular way. We will study the asymptotic eigenvalue distributions of these Toeplitz operators.

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Rumbelow, Sam. "Pseudodifferential operators on compact abelian groups with applications." Thesis, Swansea University, 2006. https://cronfa.swan.ac.uk/Record/cronfa42386.

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Pseudodifferential operators on compact groups are discussed, with an emphasis on the conditions for which the theorem of Hille and Yosida holds. Some preliminary functional analysis is given including the notion of regularly dissipative operators and Pontrjagin duality. The dual group is described, especially that it is discrete. Some important inequalities, such as Young's inequality, are also stated. Generalised trigonometrical polynomials and generalised Sobolev spaces are defined on the compact group G. A finite exhaustion of the dual space is used to define pointwise convergence and to give a condition for which a generalised Sobolev space is continuously embedded in C(G) and compactly embedded into a larger Sobolev space. The thesis defines k-ellipticity, k-smoothing operators and the k-parametrix, and proves their relation to the compactness of the embedding. It is shown that k-ellipticity is characterised by an inequality of Garding type. Some examples of pseudodifferential operators with constant coefficients are given. Another inequality of Garding type is proved for pseudodifferential operators with variable coefficients, and the existence of a weak solution to (A(x,D) - lambda)u = f is given under certain conditions on the adjoint A*(x,D). A variational solution of B[ϕ,u] = (ϕ,f) is found, and we prove a Garding type inequality for the sesquilinear form.

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Brieussel, Jeremie. "Selberg Zeta Functions and Transfer Operators for Modular Groups." Thesis, Uppsala University, Department of Mathematics, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-121406.

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Schwarzenberger, Fabian. "The Integrated Density of States for Operators on Groups." Doctoral thesis, Universitätsbibliothek Chemnitz, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-123241.

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This thesis is devoted to the study of operators on discrete structures. The operators are supposed to be self-adjoint and obey a certain translation invariance property. The discrete structures are given as Cayley graphs via finitely generated groups. Here, sofic groups and amenable groups are in the center of our considerations. Note that every finitely generated amenable group is sofic. We investigate the spectrum of a discrete self-adjoint operator by studying a sequence of finite dimensional analogues of these operators. In the setting of amenable groups we obtain these approximating operators by restricting the operator in question to finite subsets Qn , n ∈ N. These finite dimensional operators are self-adjoint and therefore admit a well-defined normalized eigenvalue counting function. The limit of the normalized eigenvalue counting functions when |Qn | → ∞ (if it exists) is called the integrated density of states (IDS). It is a distribution function of a probability measure encoding the distribution of the spectrum of the operator in question on the real axis. In this thesis, we prove the existence of the IDS in various geometric settings and for different types of operators. The models we consider include deterministic as well as random situations. Depending on the specific setting, we prove existence of the IDS as a weak limit of distribution functions or even as a uniform limit. Moreover, in certain situations we are able to express the IDS via a semi-explicit formula using the trace of the spectral projection of the original operator. This is sometimes referred to as the validity of the Pastur-Shubin trace formula. In the most general geometric setting we study, the operators are defined on Cayley graphs of sofic groups. Here we prove weak convergence of the eigenvalue counting functions and verify the validity of the Pastur-Shubin trace formula for random and non-random operators . These results apply to operators which not necessarily bounded or of finite hopping range. The methods are based on resolvent techniques. This theory is established without having an ergodic theorem for sofic groups at hand. Note that ergodic theory is the usual tool used in the proof of convergence results of this type. Specifying to operators on amenable groups we are able to prove stronger results. In the discrete case, we show that the IDS exists uniformly for a certain class of finite hopping range operators. This is obtained by using a Banach space-valued ergodic theorem. We show that this applies to eigenvalue counting functions, which implies their convergence with respect to the Banach space norm, in this case the supremum norm. Thus, the heart of this theory is the verification of the Banach space-valued ergodic theorem. Proceeding in two steps we first prove this result for so-called ST-amenable groups. Then, using results from the theory of ε-quasi tilings, we prove a version of the Banach space-valued ergodic theorem which is valid for all amenable groups. Focusing on random operators on amenable groups, we prove uniform existence of the IDS without the assumption that the operator needs to be of finite hopping range or bounded. Moreover, we verify the Pastur-Shubin trace formula. Here we present different techniques. First we show uniform convergence of the normalized eigenvalue counting functions adapting the technique of the Banach space-valued ergodic theorem from the deterministic setting. In a second approach we use weak convergence of the eigenvalue counting functions and additionally obtain control over the convergence at the jumps of the IDS. These ingredients are applied to verify uniform existence of the IDS. In both situations we employ results from the theory of large deviations, in order to deal with long-range interactions.

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Schwarzenberger, Fabian. "The Integrated Density of States for Operators on Groups." Universitätsbibliothek Chemnitz, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-138523.

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This book is devoted to the study of operators on discrete structures. The operators are supposed to be self-adjoint and obey a certain translation invariance property. The discrete structures are given as Cayley graphs via finitely generated groups. Here, sofic groups and amenable groups are in the center of our considerations. Note that every finitely generated amenable group is sofic. We investigate the spectrum of a discrete self-adjoint operator by studying a sequence of finite dimensional analogues of these operators. In the setting of amenable groups we obtain these approximating operators by restricting the operator in question to finite subsets Qn , n ∈ N. These finite dimensional operators are self-adjoint and therefore admit a well-defined normalized eigenvalue counting function. The limit of the normalized eigenvalue counting functions when |Qn | → ∞ (if it exists) is called the integrated density of states (IDS). It is a distribution function of a probability measure encoding the distribution of the spectrum of the operator in question on the real axis. We prove the existence of the IDS in various geometric settings and for different types of operators. The models we consider include deterministic as well as random situations. Depending on the specific setting, we prove existence of the IDS as a weak limit of distribution functions or even as a uniform limit. Moreover, in certain situations we are able to express the IDS via a semi-explicit formula using the trace of the spectral projection of the original operator. This is sometimes referred to as the validity of the Pastur-Shubin trace formula. In the most general geometric setting we study, the operators are defined on Cayley graphs of sofic groups. Here we prove weak convergence of the eigenvalue counting functions and verify the validity of the Pastur-Shubin trace formula for random and non-random operators . These results apply to operators which not necessarily bounded or of finite hopping range. The methods are based on resolvent techniques. This theory is established without having an ergodic theorem for sofic groups at hand. Note that ergodic theory is the usual tool used in the proof of convergence results of this type. Specifying to operators on amenable groups we are able to prove stronger results. In the discrete case, we show that the IDS exists uniformly for a certain class of finite hopping range operators. This is obtained by using a Banach space-valued ergodic theorem. We show that this applies to eigenvalue counting functions, which implies their convergence with respect to the Banach space norm, in this case the supremum norm. Thus, the heart of this theory is the verification of the Banach space-valued ergodic theorem. Proceeding in two steps we first prove this result for so-called ST-amenable groups. Then, using results from the theory of ε-quasi tilings, we prove a version of the Banach space-valued ergodic theorem which is valid for all amenable groups. Focusing on random operators on amenable groups, we prove uniform existence of the IDS without the assumption that the operator needs to be of finite hopping range or bounded. Moreover, we verify the Pastur-Shubin trace formula. Here we present different techniques. First we show uniform convergence of the normalized eigenvalue counting functions adapting the technique of the Banach space-valued ergodic theorem from the deterministic setting. In a second approach we use weak convergence of the eigenvalue counting functions and additionally obtain control over the convergence at the jumps of the IDS. These ingredients are applied to verify uniform existence of the IDS. In both situations we employ results from the theory of large deviations, in order to deal with long-range interactions.

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Martin, Gary. "Connecting the church through small groups Worthington Christian Church's small groups focus for 2005 /." Theological Research Exchange Network (TREN), 2006. http://www.tren.com/search.cfm?p031-0168.

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Moreno, Lars. "Informal Leadership in Small Groups." Thesis, Mittuniversitetet, Institutionen för samhällsvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-16681.

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This study identified factors and variables of informal leadership in small groups with different gender composition (Men, women and mixed groups) and goal orientation (competition and cooperation). Behavioral dominance patterns (Information Sheet, pencil, decision sheet) and number of verbal interventions were compared to the main informal leadership factors identified in the groups. There were 24 participants (12 men and 12 women). Among the main variables and factors identified, there were some that had a higher possibility to appear than other. There was no significant difference of the factors and variables between women and men. Communication variables were more likely to be present in groups with the goal of cooperation as for the goal of competition. Guidance variables were more likely to be present in women groups than in men groups and mixed groups. There was a significant correlation between the factor’s Communication, Character and Guidance with the number of interventions and behavioral dominance patterns.

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Книги з теми "Operators of small groups"

Derighetti, Antoine. Convolution Operators on Groups. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-20656-6.

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service), SpringerLink (Online, ed. Convolution Operators on Groups. Springer-Verlag Berlin Heidelberg, 2011.

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Chu, Cho-Ho. Matrix Convolution Operators on Groups. Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-69798-5.

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service), SpringerLink (Online, ed. Matrix convolution operators on groups. Springer, 2008.

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Robinson, Derek W. Elliptic operators and Lie groups. Clarendon Press, 1991.

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J, Mahaney C., ed. Why small groups? People of Destiny International, 1996.

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Riley, Betsy. Small groups manual. Worldwide Discipleship Association, 1992.

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Wong, M. W., and Hongmei Zhu, eds. Pseudo-Differential Operators: Groups, Geometry and Applications. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-47512-7.

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M, Levine John, and Moreland Richard L, eds. Small groups: Key readings. Psychology Press, 2006.

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Publishers, Stenhouse, ed. Spotlight on small groups. Stenhouse Publishers, 2008.

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Частини книг з теми "Operators of small groups"

Bump, Daniel. "Compact Operators." In Lie Groups. Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-8024-2_3.

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Bump, Daniel. "Compact Operators." In Lie Groups. Springer New York, 2004. http://dx.doi.org/10.1007/978-1-4757-4094-3_3.

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Recasens, Jordi. "Vague Groups." In Indistinguishability Operators. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-16222-0_12.

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Hafez, Kai, and Anne Grüne. "Small groups." In Foundations of Global Communication. Routledge, 2022. http://dx.doi.org/10.4324/9781003255239-8.

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van Schaik, Leon, Nigel Bertram, Shane Murray, Deborah Rowe, and Helena Harry. "Small Groups." In Suburbia Reimagined. Routledge, 2018. http://dx.doi.org/10.4324/9781315111315-6.

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Tuset, Lars. "Unbounded Operators." In Analysis and Quantum Groups. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-07246-8_9.

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Ruzhansky, Michael, and Ville Turunen. "Groups." In Pseudo-Differential Operators and Symmetries. Birkhäuser Basel, 2010. http://dx.doi.org/10.1007/978-3-7643-8514-9_11.

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Zhu, Kehe. "Small Hankel Operators." In Analysis on Fock Spaces. Springer US, 2012. http://dx.doi.org/10.1007/978-1-4419-8801-0_7.

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Konno, Hitoshi. "The Vertex Operators." In Elliptic Quantum Groups. Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-7387-3_5.

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Helgason, Sigurdur. "Invariant differential operators." In Groups and Geometric Analysis. American Mathematical Society, 2000. http://dx.doi.org/10.1090/surv/083/03.

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Тези доповідей конференцій з теми "Operators of small groups"

Edgar, Mujuni, Mengu Cho, and Ramson Nyamukondiwa. "Ground Station Network Architecture for Scheduled Remote Operations of Birds Bus Cubesats in Partner Countries." In 31st IAA Symposium on Small Satellite Missions, Held at the 75th International Astronautical Congress (IAC 2024). International Astronautical Federation (IAF), 2024. https://doi.org/10.52202/078365-0149.

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Ma, Yiping, Yuting Zhan, and Bo Yang. "Research on WebGIS for Small Hydropower Groups Based on ASP.NET." In 2024 3rd International Conference on Energy, Power and Electrical Technology (ICEPET). IEEE, 2024. http://dx.doi.org/10.1109/icepet61938.2024.10626327.

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Killinger, Arthur G., and Mark J. O’Connell. "Diesel Generator Owner’s Groups Improve Power Plant Operations and Maintenance." In ASME 2006 Internal Combustion Engine Division Spring Technical Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/ices2006-1443.

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Diesel generator sets are installed at nuclear power plants to provide emergency power to ensure safe shut down of the reactor in the event of an accident. In the United States, all nuclear power plants belong to one of six different Diesel Generator Owner’s Groups. Some groups have been in existence for over 17 years and the members have all benefited from their participation. In the past three years, the Diesel Generator Owner’s Group concept has spread and two new groups have been formed among a number of independent diesel generator power plant owners and operators in Latin America and the Caribbean area. This paper describes: (1) how electric power plants, large and small, have formed Diesel Generator Owner’s Groups, (2) how better working relationships between the power plants and the engine manufacturer have been established, and (3) how involvement in a strong owner’s group provides significant benefits to the members. The primary goal of the groups is to increase reliability and improve performance of the diesel engines at the respective power plants. Typical objectives of effective Diesel Generator Owner’s Groups include: • Provide a mechanism for rapid resolution of specific problems with the diesel engine, generator and auxiliary systems, • Provide improved communications among the owners and the diesel generator manufacturer, • Develop a group of “technical experts” and expand that knowledge base to other plant personnel, and • Identify methods to improve diesel engine generator and overall power plant performance, reliability, availability and safety. Active participation in Diesel Generator Owner’s Group has resulted in real payback for the owners and manufacturers alike. To illustrate this fact, several unique diesel engine problems are described along with the approach the Diesel Generator Owner’s Groups used to resolve the problems. Finally, overall diesel generator reliability and availability have improved. These groups have worked to develop the best possible technical environment to continue improving diesel generator power plant performance, operation and maintenance.

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Martins, Diogo S., and Maria da Graça C. Pimentel. "Browsing interaction events in recordings of small group activities via multimedia operators." In the 18th Brazilian symposium. ACM Press, 2012. http://dx.doi.org/10.1145/2382636.2382689.

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Banas, Jacquelyn, Matthias Vyshnevskyy, Rene Wagner, Florian Holzapfel, and Joschka Hofling. "Understanding UAS Operator and Aviation Authority Challenges with the SORA Process for UAS Operational Approval in DACH Nations." In Vertical Flight Society 79th Annual Forum & Technology Display. The Vertical Flight Society, 2023. http://dx.doi.org/10.4050/f-0079-2023-18186.

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The new SORA process for authorization of unmanned flight operations has quickly become an important method and major challenge for UAS operations in and around Europe, particularly in the German-speaking DACH nations. Under the SORA process, UAS operators often experience significantly higher application workloads, costs, and time until authorization. Through a targeted set of industry outreach and data gathering initiatives, the UAV DACH SORA Focus Group sought to understand the challenges faced on all sides of the SORA process. Findings show that SORA applicants are typically very small groups with diverse experience levels, missions, and aircraft - often not from aircraft safety/certification backgrounds. On average, DACH applicants needed nearly six months for full UAS operational approval, and this long time was rated as the most painful element in the SORA process. UAS operators overall support the methodology and vision of the SORA process. With increased clarity in rules and expectations, standardization across regions, availability of aids and training materials, and additional PDRAs and STSs, the SORA process could run much more efficiently and better support the growing complexity of DACH-region UAS operations.

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Zihlmann, Livia, Mike Parker, and Luke Malsam. "Surface Tubing Temperature Transducers Reduce Damage to Downhole Equipment Following a Downhole Gauge Failure." In SPE Gulf Coast Section Electric Submersible Pumps Symposium. SPE, 2021. http://dx.doi.org/10.2118/204490-ms.

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Abstract Downhole sensors gather vital data for the health of an ESP system. Not only do the sensor readings help indicate the flow pattern; they also help indicate further issues such as plugging and degradation of the ESP system. Once a system has grounded on a single phase, sensor readings are lost, and operators must rely on current and frequency for the system to operate efficiently. In unconventional applications of ESP, operators see a small difference between no load, no flow and gas locking conditions. This small difference is due to the de-rating of motors used in order to get the fluid to surface in the severe applications. When the sensor readings typically are lost, operators are no longer able to accurately diagnose the reason for a shutdown. Adding the Tubing Temperature Transducers (TTT's) helps regain an indication of motor temperature along with load on the system. When operators have a drop in the tubing temperature this indicates the system is not able to get as much fluid to surface either indicating gas locking or a no-load condition which results in heating of the downhole system, particularly the motor. All these possible scenarios cause degradation of the ESP equipment and can cause pre-mature failure. If the system is set up with TTT's operators can shut-in the well to avoid extended periods of excessive heating caused by either gas locking or no flow conditions. Single phase to ground conditions occur frequently, however this paper does not address the root cause of a single-phase grounds, rather it addresses what the operator can do to operate efficiently when a unit has grounded out a single phase.

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Passi, Tomi, Satu Pakarinen, and Marja Liinasuo. "Field operators' visual inspection practices in the operating Finnish nuclear power plants." In 15th International Conference on Applied Human Factors and Ergonomics (AHFE 2024). AHFE International, 2024. http://dx.doi.org/10.54941/ahfe1004883.

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In nuclear power plants (NPPs), the integrity of the plant is assured, among other safety measures, by regularly conducted field operator (FO) visual inspection rounds. During these rounds, the FOs tour the NPP and inspect the equipment. Despite the term ‘visual inspection,’ other senses are also used in the task. Previously, no systematic information on visual inspection practices in NPPs has been collected.The objective of the study is to gain an understanding of the visual inspection practices. The goal is to systematically document how visual inspection is conducted, expertise developed, and to compare the practices between the different NPPs. Altogether, five FOs and two trainers, representing all operating NPPs in Finland, participated in the semi-structured interviews. We grouped the plants based on their similarities, resulting in three plant groups.All FOs considered the visual inspection as their most crucial task. During the inspection rounds, the FOs examine the integrity of equipment and appropriateness of the facilities. They record readings and make notes about the equipment; one group uses a paper checklist and two others a tablet with a brief history of the process values. Furthermore, looking, listening, touching, and even smelling form an integral part of inspection rounds for all FOs. The inspection rounds are usually performed by one FO at a time, twice in a 12-hour shift. If something deviant is noticed, another FO often participates in the round. In two groups, rounds may have interruptions due to other tasks, such as separations and reconnections. In contrast, one group reported that the rounds are always performed uninterrupted.In general, vision was reported to be the most critical sense for visual inspection. By looking, the FOs get information about the integrity of the surfaces, perceive the meter readings, and evaluate the appropriateness of the facilities. However, hearing was often reported to be as important as vision. With increasing expertise, FOs can collect information by actively listening for indications of faults within the equipment, such as bearing malfunctions. In addition, tactile sense was found important for detecting deviant temperatures of both rooms and equipment and unusual vibrations. Also, smell can be used to detect, for example, oil leaks.All FOs collaborated with the main control room (MCR) operators to whom the round information was delivered. In addition, the FOs were in contact with the maintenance concerning faults and the cleaning personnel regarding the cleaning matters.The initial training for visual inspection is a classroom learning lasting two to three months. However, the most vital part of the training, in terms of the work in practice, is training during working. Then, the FOs perform rounds under the supervision of experienced FOs for approximately one year. After this period, the work is carried out independently.For the most part, all FOs perform the visual inspection rounds similarly. However, some differences are found, which, at large, seem to be explained by the devices used and the structure of the facilities.

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Crespo Coelho da Silva Pinto, Alexandre, Francisco Felipe da Silva Júnior, and Diogo Cunha dos Reis. "Analysis of Baggage Handling in Airplane Cargo Hold of Commercial Airplane: A Case Study in Ergonomics." In Applied Human Factors and Ergonomics Conference. AHFE International, 2022. http://dx.doi.org/10.54941/ahfe100782.

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Ergonomic studies related to commercial aviation have focused on improvements related to drivers’ commands and cockpit. However, a small number of studies are devoted to the ground manual transport related to the airplane cargo hold. This study aimed to analyze the biomechanical overload in manual load lifting tasks among ramp operators of commercial airplanes through the application of NIOSH and RULA methods. Two cases involving luggage loading and unloading activities were observed. Data collection was performed with a ramp operator, which photos and filming of activities and workplace during passenger boarding and disembarking of passengers. The biomechanical factors observed and analyzed in this study, with the application of NIOSH and RULA methods, allowed generating values that indicated that luggage loading and unloading activities bring high biomechanical risk for both the manual load lifting activity and for the postures used during luggage handling, which may cause health problems to ramp operators.

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Brown, Jonathan, Jeremy P. Gray, Chris Blanco, Amit Juneja, Joel Alberts, and Lauren Reinerman. "HANDS-FREE, HEADS-UP CONTROL SYSTEM FOR UNMANNED GROUND VEHICLES." In 2024 NDIA Michigan Chapter Ground Vehicle Systems Engineering and Technology Symposium. National Defense Industrial Association, 2024. http://dx.doi.org/10.4271/2024-01-3266.

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<title>ABSTRACT</title> <p>This paper describes work to develop a hands-free, heads-up control system for Unmanned Ground Vehicles (UGVs) under an SBIR Phase I contract. Industry is building upon pioneering work that it has done in creating a speech recognition system that works well in noisy environments, by developing a robust key word spotting algorithm enabling UGV Operators to give speech commands to the UGV completely hands-free. Industry will also research and develop two sub-vocal control modes: whisper speech and teeth clicks. Industry is also developing a system that will enable the Operator to drive a UGV, with a high level of fidelity, to a location selected by the Operator using hands-free commands in conjunction with image segmentation and video overlays. This Phase I effort will culminate in a proof-of-concept demonstration of a hands-free, heads-up system, implemented on a small UGV, that will enable the Operator have a high level of fidelity for control of the system.</p>

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Rynes, Matthew, Leila Ghanbari, Jay Jia Hu, et al. "Principles of Computer Numerical Control Applied to Small Research Animal Surgical Procedures." In 2018 Design of Medical Devices Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/dmd2018-6959.

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The tools and techniques available for systems neuroscientists for neural recording and stimulation during behavior have become plentiful in the last decade. The tools for implementing these techniques in vivo, however, have not advanced respectively. The use of these techniques requires the removal of sections of skull tissue without damaging the underlying tissue, which is a very delicate procedure requiring significant training. Automating a part of the tissue removal processes would potentially enable more precise procedures to be performed, and it could democratize these procedres for widespread adoption by neuroscience lab groups. Here, we describe the ‘Craniobot’, a microsurgery platform that combines automated skull surface profiling with a computer numerical controlled (CNC) milling machine to perform a variety of microsurgical procedures in mice. Surface profiling by the Craniobot has micrometer precision, and the surface profiling information can be used to perform milling operations with relatively quick, allowing high throughput. We have used the Craniobot to perform skull thinning, small to large craniotomies, as well as drilling pilot holes for anchoring cranial implants. The Craniobot is implemented using open source and customizable machining practices and can be built with of the shelf parts for under $1000.

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Keefer, Philip, and Benjamin Roseth. Grand Corruption in the Contracting Out of Public Services: Lessons from a Pilot Study in Colombia. Inter-American Development Bank, 2021. http://dx.doi.org/10.18235/0003335.

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Do targeted transparency interventions reduce corrupt behavior when corrupt actors are few and politically influential; their behavior imposes small costs on numerous individuals; and corrupt behavior is difficult to observe? Results from a study of informal audits and text messages to parents, meant to curb corruption in the School Meals Program of Colombia, suggests that they can. Theory is pessimistic that transparency interventions can change the behavior of actors who exert significant influence over supervisory authorities. Moreover, inherent methodological obstacles impede the identification of treatment effects. Results substantiate the presence of these obstacles, especially considerable spillovers from treated to control groups. Despite spillovers, we find that parental and operator behavior are significantly different between treatment and control groups. Additional evidence explains why operator behavior changed: out of concern that systematic evidence of corrupt behavior would trigger enforcement actions by high-level enforcement agencies outside of the political jurisdictions where they are most influential.

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Holod, Petro I. Geometric Quantization, Cohomology Groups and Intertwining Operators. GIQ, 2012. http://dx.doi.org/10.7546/giq-1-2000-95-104.

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BACCELLI, François, Sébastien CANDEL, Guy PERRIN, and Jean-Loup PUGET. Large Satellite Constellations: Challenges and Impact. Académie des sciences, 2024. http://dx.doi.org/10.62686/3.

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The New Space Age (NewSpace) marks the advent of a new era in the use of space, characterized by the opening of space to new players, the use of new space technologies, new functionalities for satellites in orbit, and the development of satellite constellations, mainly in the fields of communications and Earth observation. These developments are underpinned by first-rate scientific and technological advances, as well as considerable public and private investment, in particular in the USA, China and, to a lesser extent, Europe. Fleets of small low- and medium-orbit satellites are replacing or complementing the large geostationary satellites that predominated in the previous period. Whereas space used to be reserved to a small number of states and major industrial groups, one is now witnessing the emergence of new space states, new industrial groups such as SpaceX or Amazon, and many start-ups. One also observes the emergence of companies with launching and satellite manufacturing capacities, which are also taking on the role of telecommunication operators and content producers. The most visible result of the deployment of these new space networks is the ability to provide high-speed, low-latency Internet connections to any point on the globe. Combined with Earth observation capabilities, these new communications resources also enable real-time action to be taken in any region, including those with no equipment other than terminals. In addition, these space networks are remarkably resilient compared with terrestrial networks. Geostrategic and military considerations combine with rapidly evolving business models to explain the massive investments currently being made in this domain. However, the lack of international regulation in the field is leading to a race to occupy orbits and frequencies, which has already had serious consequences for a whole range of scientific activities. These constellations have a potentially negative impact on astronomy in the visible and infrared optical domains, as well as on radio astronomy. They also raise a major problem in terms of space congestion, with an increase in the amounts of satellite debris resulting from launches or collisions between satellites, and the possibility of reaching a phase of chain reaction collisions. In addition, from an environmental point of view, the consequences of the proliferation of launches and uncontrolled re-entries into the atmosphere are equally worrying. What’s more, the lack of regulation in the field also leads to a loss of sovereignty, since these new satellite communication networks do not comply with any of the rules that states impose on terrestrial communication networks operating on their territories. A sustainable, global solution must be found to these problems, before major and potentially irreversible damage is inflicted on the planet’s environment, geostrategic balances, democracy, and science. While the Acad´emie des Sciences considers that France and Europe need to step up their scientific and industrial actions in this field in order to benefit from the remarkable advances of these new networks, and ultimately leverage the benefits of a resilient and secure communications network, the Acad´emie also recommends working in parallel to strengthen regulation of the field with the aim of assuring sustainable access to orbital and frequency resources, as well as protection for negatively impacted fields, foremost among which are astronomy and the environment.

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Miller, Jack, and Marie-Laure Hicks. Small Modular Nuclear Reactors. Parliamentary Office of Science and Technology, 2018. http://dx.doi.org/10.58248/pn580.

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There is growing UK and international interest in using ‘small modular nuclear reactors’ (SMRs) to generate electricity, and the UK Government announced a number of measures to support SMR development in the 2018 Nuclear Sector Deal. Stakeholders suggest that, compared with conventional nuclear reactors, SMRs could offer cost savings to operators and consumers, more flexible energy production and a greater choice of potential sites. This note examines key aspects of SMR technology, their economics and regulation.

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Murcia, Juan Felipe, Ernesto Cuestas, Roland Michelitsch, and Alejandro Soriano. Evaluation of IDB Group's Work through Financial Intermediaries: SME Finance Background Report. Inter-American Development Bank, 2016. http://dx.doi.org/10.18235/0009278.

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This background paper has been prepared in conjunction with acomprehensive evaluation of the work of the Inter-American Development Bank Group through financial intermediaries in Latin America and the Caribbean. The paper focuses on those IDBG operations with FIs (mostly commercial banks) that seek to expand access to finance for small and medium-sized enterprises.

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Regenwetter, Michel. Testing Transitivity and Related Axioms of Preference for Individuals and Small Groups. Defense Technical Information Center, 2008. http://dx.doi.org/10.21236/ada586703.

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Siebenaler. L52272 Detection of Small Leaks in Liquid Pipelines - Gap Study of Available Methods. Pipeline Research Council International, Inc. (PRCI), 2007. http://dx.doi.org/10.55274/r0010662.

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The integrity of the liquid pipeline network in the United States is of concern to the pipeline operators, the surrounding communities, and the government. During a recent Office of Pipeline Safety industry forum, concerns regarding the detection of small liquid leaks were discussed. The important topic areas related to small leak detection included identifying the available real-time monitoring and detection systems, assessing the need for new detection technologies, and understanding the performance of currently available systems. The objective of the project was to assess the gap between what liquid pipeline operators need in terms of leak detection and what various leak detection technologies can provide, specifically related to small leaks. For this gap analysis study, small leaks were considered to be pipeline releases that were less than 5% of nominal pipeline flow rate.

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Wang, Yong-Yi. PR-350-154501-R01 Evaluation of Girth Weld Flaws in Vintage Pipelines. Pipeline Research Council International, Inc. (PRCI), 2019. http://dx.doi.org/10.55274/r0011600.

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Being able to estimate the tensile strain capacity (TSC) of vintage girth welds is sometimes necessary in the integrity management of vintage pipelines. For instance, assessing the girth weld integrity could be a top priority after a confirmed ground movement event. Decisions may also be needed about the disposition of a girth weld when weld anomalies are found. This project is aimed to develop a TSC estimation tool for vintage girth welds. The work includes two parts: (1) the development of a TSC estimation tool via numerical analysis and (2) the evaluation of the developed tool via experimental testing. This report covers both the development and evaluation of the TSC estimation tool. The tool was developed by taking the outcome of the case-specific TSC analysis using Level 4a procedures of the PRCI-CRES tensile strain models and considering large ranges of material and dimensional parameters. The curved wide plate (CWP) and accompanying small-scale tests were conducted to evaluate the tool. The applicability and limitations of the tool are covered in this report. The tool developed in this project has a user-friendly interface and an accompanying help manual. The tool takes user inputs, such as the geometry and material properties of pipe and weld, flaw dimensions, and pipeline pressure, and provides an estimated TSC. For the inputs that might not have readily available values, recommended values are provided. This tool allows the evaluation of the impact of various input parameters on TSC. The ability to estimate the TSC enables operators to assess the integrity of vintage girth welds, thus facilitating the prioritization of maintenance activities and reducing unnecessary remediation work.

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Lacy, Katherine, Katherine Lim, David J. Williams, and Christine Whitt. Nonfamily farm operations and the households that operate them. U.S. Department of Agriculture, Economic Research Service, 2025. https://doi.org/10.32747/2025.9015819.ers.

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Nonfamily farms (where no producer, household, or extended family owns at least 50 percent of the operation) constitute about 2 percent of total U.S. farms from 2018 to 2022. This report explores nonfamily farms and the households of their principal producers by farm size combining data collected from the annual Agricultural Resource Management Survey from 2018 to 2022. Statistics for nonfamily farms are compared with equivalently sized family farms. Findings show that 70 percent of all nonfamily farms were considered small, with less than $350,000 in gross cash farm income. Nonfamily farms accounted for 13.4 percent of the value of production from 2018 to 2022 (combined), but much of that production came from large-scale producers. Small nonfamily farms were less financially vulnerable compared with small family farms. Principal producer households of nonfamily farms had lower wealth, income, and debt compared with family farm principal producer households.--

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Turnley, Jessica G. Cross-Cultural Competence and Small Groups: Why SOF Are the Way SOF Are. Defense Technical Information Center, 2011. http://dx.doi.org/10.21236/ada541961.

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