cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Quantum time
Creators: name: Oppenheim, Jonathan A.
Publisher: name: University of British Columbia
Year: 2009

description: In quantum mechanics, time plays a role unlike any other observable. We find that measuring whether an event happened, and measuring when an event happened are fundamentally different - the two measurements do not correspond to compatible observables and interfere with each other. We also propose a basic limitation on measurements of the arrival time of a free particle given by 1/Ek where Ek is the particle's kinetic energy. The temporal order of events is also an ambiguous concept in quantum mechanics. It is not always possible to determine whether one event lies in the future or past of another event. One cannot measure whether one particle arrives to a particular location before or after another particle if they arrive within a time of 1/E of each other, where E is the total kinetic energy of the two particles. These new inaccuracy limitations are dynamical in nature, and fundamentally different from the Heisenberg uncertainty relations. They refer to individual measurements of a single quantity. It is hoped that by understanding the role of time in quantum mechanics, we may gain new insight into the role of time in a quantum theory of gravity.
UNDERSTANDING THE GLOBAL COMMONS
Creators: name: Bromley, Daniel W.
name: Cochrane, Jeffrey A.
name: Bromley, Daniel W.
name: Cochrane, Jeffrey A.
Publisher: name: Unknown
Year: 1994
Subjects: Environmental Economics and Policy

description: We want to clarify the way in which we think about the global commons, particularly the problem of global warming caused by greenhouse gas emissions and tropical deforestation. We develop a policy framework in which the policy goal is the sustainability of the earth's ability to absorb greenhouse gases. The framework considers the unequal incidence of benefits and costs of particular policies. We identify several resource management regimes and suggest that management under a common property regime is most appropriate. We conclude by identifying and briefly discussing types of policies that can achieve sustainability.
ENVIRONMENT, INCOME, AND DEVELOPMENT IN SOUTHERN AFRICA
Creators: name: Chapman, Duane
name: Chapman, Duane
Publisher: name: Unknown
Year: 1993
Subjects: Resource /Energy Economics and Policy

description: It is widely believed that rural forest and agricultural resources in Southern Africa are overused, in the sense that both biomass and harvest levels are significantly below levels of maximum sustainable yield. However, economic theory suggests that high interest and time preference rates cause the economic optimum to coincide with generally-observed patterns. In addition, low income may be the driving factor behind high interest and time preference rates. In macro-economic terms, Southern Africa may be experiencing a productivity crisis. This leads to a downward shift in the labor demand curve, and an equilibrium result with undesirably low wage rates, high unit labor costs, and high and growing unemployment. In this context, the imposition of pollution control costs might worsen an already negative macro-economic picture. The mechanism would be a reduction in exports and an increase in imports. The productivity problem, in turn, may be a result of social factors unique to Southern Africa. Improvement in these social conditions could resolve much of the economic problem of low productivity. A review of the literature on technology transfer and green technologies offers little basis to presume that new technologies can alter this picture. One approach to positive remedies is to examine international solutions. Three kinds of potential environmental policies are: (A) tradeable pollution permits, (B) leveraged World Bank environmental adjustment programs, and (C) international petroleum taxation and income transfer. Given Southern Africa's unique position as a source of global industrial raw materials, it should be possible to develop policies that simultaneously enhance income levels and environmental protection.
Physics and metaphysics looks at computation
Creators: name: Svozil, Karl
Publisher: name: arXiv
Year: 2005
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: As far as algorithmic thinking is bound by symbolic paper-and-pencil operations, the Church-Turing thesis appears to hold. But is physics, and even more so, is the human mind, bound by symbolic paper-and-pencil operations? What about the powers of the continuum, the quantum, and what about human intuition, human thought? These questions still remain unanswered. With the strong Artificial Intelligence assumption, human consciousness is just a function of the organs (maybe in a very wide sense and not only restricted to neuronal brain activity), and thus the question is relegated to physics. In dualistic models of the mind, human thought transcends symbolic paper-and-pencil operations.
description: Contribution to a book on the Church-Turing Thesis, ed. by Adam Olszewski
POLICY LESSONS FROM HISTORY AND NATURAL RESOURCE PROJECTS IN RURAL HAITI
Creators: name: White, Thomas A.
name: White, Thomas A.
Publisher: name: Unknown
Year: 1994
Subjects: Resource /Energy Economics and Policy

description: The rural population of Haiti is sinking ever deeper into poverty and misery in parallel with the rapid degradation of its agricultural and forest lands. With essentially no remaining agricultural frontier, no significant value-added products and markets, and very few off-farm employment opportunities, many view emigration as their only hope. This downward spiral of welfare results mostly from taxes on rural production coupled with lack of government investments in rural infrastructure and measures. Traditional rural institutions that could contribute to development have been seen as a political threat and have been repressed. It is evident from the history of Haiti that even good projects have not made up for bad sectoral policies and repressive politics. Large amounts of aid dollars and rapid adoption of specific techniques have not been able to buy development. Though there are many examples of successful local action, alone it is not enough for rural revival. Before spending additional resources productively in rural areas, the government needs three basic reforms. 1. Reform the legal framework and administration that govern rural Haiti. 2. Reform the Ministry of Agriculture, Natural Resources, and Rural Development to serve peasants, encourage rural enterprises, and cooperate with nongovernmental organizations (NGOs). 3. Initiate and support alternative nongovernment organizational structures (such as NGO umbrella organizations and networks) to implement policies and development programs. Once the macropolicy and institutional reforms are in place, the government needs policy and program action to: * improve basic and essential social and physical infrastructure in rural areas, * strengthen local indigenous groups to manage rural development activities, * support the development of rural microenterprises to provide opportunities for off-farm employment, and * increase peasant social and economic security through legal means and productivity enhancement.
Modular Adaptive System Based on a Multi-Stage Neural Structure for Recognition of 2D Objects of Discontinuous Production
Creators: name: Topalova, I.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: This is a presentation of a new system for invariant recognition of 2D objects with overlapping classes, that can not be effectively recognized with the traditional methods. The translation, scale and partial rotation invariant contour object description is transformed in a DCT spectrum space. The obtained frequency spectrums are decomposed into frequency bands in order to feed different BPG neural nets (NNs). The NNs are structured in three stages - filtering and full rotation invariance; partial recognition; general classification. The designed multi-stage BPG Neural Structure shows very good accuracy and flexibility when tested with 2D objects used in the discontinuous production. The reached speed and the opportunuty for an easy restructuring and reprogramming of the system makes it suitable for application in different applied systems for real time work.
description: www.ars-journal.com
Twisted Rota-Baxter operators and Reynolds operators on Lie algebras and NS-Lie algebras
Creators: name: Das, Apurba
Publisher: name: arXiv
Year: 2020
Subjects: subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 17B56, 16T25, 17B37, 17B40

description: In this paper, we introduce twisted Rota-Baxter operators on Lie algebras as an operator analogue of twisted r-matrices. We construct a suitable $L_\infty$-algebra whose Maurer-Cartan elements are given by twisted Rota-Baxter operators. This allows us to define cohomology of a twisted Rota-Baxter operator. This cohomology can be seen as the Chevalley-Eilenberg cohomology of a certain Lie algebra with coefficients in a suitable representation. We study deformations of twisted Rota-Baxter operators from cohomological points of view. Some applications are given to Reynolds operators and twisted r-matrices. Next, we introduce a new algebraic structure, called NS-Lie algebras, that are related to twisted Rota-Baxter operators in the same way pre-Lie algebras are related to Rota-Baxter operators. We end this paper by considering twisted generalized complex structures on modules over Lie algebras.
description: Title has been changed slightly and some minor revision has been done. (Final version)
КЛИНИКО-ПАТОГЕНЕТИЧЕСКИЕ АСПЕКТЫ РЕЧЕВЫХ НАРУШЕНИЙ У ДЕТЕЙ ДОШКОЛЬНОГО ВОЗРАСТА
Creators: name: Бердиева, Хилолахон
name: Садыкова, Гульчехра
Publisher: name: Zenodo
Year: 2024

description: Проблема позднего развития речевой деятельности у детей раннего возраста без выраженной психической патологии с каждым годом становится все более актуальной. Речь, сначала внешняя, а затем и внутренняя, представляет собой основу регуляции поведения, ключ к высшим психическим функциям, без которых невозможно полноценное взаимодействие с окружающим миром.[1,2].
Solving non-linear integral equations for laser pulse retrieval with Newton's method
Creators: name: Jasiulek, Michael
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We present an algorithm based on numerical techniques that have become standard for solving nonlinear integral equations: Newton's method, homotopy continuation, the multilevel method and random projection to solve the inversion problem that appears when retrieving the electric field of an ultrashort laser pulse from a 2-dimensional intensity map measured with Frequency-resolved optical gating (FROG), dispersion-scan or amplitude-swing experiments. Here we apply the solver to FROG and specify the necessary modifications for similar integrals. Unlike other approaches we transform the integral and work in time-domain where the integral can be discretised as an over-determined polynomial system and evaluated through list auto-correlations. The solution curve is partially continues and partially stochastic, consisting of small linked path segments and enables the computation of optimal solutions in the presents of noise. Interestingly, this is a novel method to find real solutions of polynomial systems which are notoriously difficult to find. We show how to implement adaptive Tikhonov-type regularization to smooth the solution when dealing with noisy data, we compare the results for noisy test data with a least-squares solver and propose the L-curve method to fine-tune the regularization parameter.
description: 22 pages, 7 figures, (accepted in Phys. Rev. E)
Metric monads
Creators: name: Rosický, JIří
Publisher: name: arXiv
Year: 2020
Subjects: subject: Category Theory (math.CT)
subject: FOS: Mathematics

description: We develop universal algebra over an enriched category $\mathcal K$ and relate it to finitary enriched monads over $\mathcal K$. Using it, we deduce recent results about ordered universal algebra where inequations are used instead of equations. Then we apply it to metric universal algebra where quantitative equations are used instead of equations. This contributes to understanding of finitary monads on the category of metric spaces.
description: 22 pages, an improved version
A Generalization of Connes-Kreimer Hopf Algebra
Creators: name: Byun, Jungyoon
Publisher: name: arXiv
Year: 2005
Subjects: subject: Mathematical Physics (math-ph)
subject: Quantum Algebra (math.QA)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: ``Bonsai'' Hopf algebras, introduced here, are generalizations of Connes-Kreimer Hopf algebras, which are motivated by Feynman diagrams and renormalization. We show that we can find operad structure on the set of bonsais. We introduce a new differential on these bonsai Hopf algebras, which is inspired by the tree differential. The cohomologies of these are computed here, and the relationship of this differential with the appending operation $*$ of Connes-Kreimer Hopf algebras is investigated.
SHRIMP MARICULTURE DEVELOPMENT IN ECUADOR: SOME RESOURCE POLICY ISSUES
Creators: name: Southgate, Douglas
name: Southgate, Douglas
Publisher: name: Unknown
Year: 1992
Subjects: Resource /Energy Economics and Policy

description: During the past 15 years, Ecuador has become the Western Hemisphere's leading producer and exporter of shrimp. Growth has come about largely through mariculture development. About 8,000 metric tons (MT) of shrimp have been captured off the Ecuadorian coast each year since the late 1970s. Meanwhile, pond output has increased several-fold, from less than 5,000 MT in 1979 to over 100,000 MT 12 years later (Table 1). Mariculture has expanded largely at the expense of renewable natural resources. Mangrove swamps, characterized by extremely high biological productivity and, therefore, a critical element of coastal ecosystems, have been displaced. In addition, shrimp postlarvae (PL) collection has at times been excessive and wastewater emissions from some enterprises harm the environment. Mariculture also suffers from water pollution from agricultural, urban, and industrial sources. This paper first describes the extent and consequences of coastal ecosystem disturbance; then presents a causal analysis of environmental problems. Policies contributing to depletive management of wetlands and related resources are similar to policies stimulating tropical deforestation. The tenurial regime rewards those who convert coastal ecosystems into shrimp ponds, just as frontier property arrangements encourage agricultural colonists to convert natural ecosystems into farmland (Southgate 1990). In addition, mariculture's geographic expansion, like agriculture's, has been accelerated by inadequate spending on education, research, and extension (Southgate 1991). If this policy regime remains unchanged, continued deterioration of Ecuador's coastal ecosystems is inevitable.
Homotopic curve shortening and the affine curve-shortening flow
Creators: name: Avvakumov, Sergey
name: Nivasch, Gabriel
Publisher: name: Journal of Computational Geometry
Year: 2021

description: We define and study a discrete process that generalizes the convex-layer decomposition of a planar point set. Our process, which we call \emph{homotopic curve shortening} (HCS), starts with a closed curve (which might self-intersect) in the presence of a set $P\subset \mathbb R^2$ of point obstacles, and evolves in discrete steps, where each step consists of (1) taking shortcuts around the obstacles, and (2) reducing the curve to its shortest homotopic equivalent. We find experimentally that, if the initial curve is held fixed and $P$ is chosen to be either a very fine regular grid or a uniformly random point set, then HCS behaves at the limit like the affine curve-shortening flow (ACSF). This connection between ACSF and HCS generalizes the link between ACSF and convex-layer decomposition (Eppstein et al., 2017; Calder and Smart, 2020), which is restricted to convex curves. We prove that HCS satisfies some properties analogous to those of ACSF: HCS is invariant under affine transformations, preserves convexity, and does not increase the total absolute curvature. Furthermore, the number of self-intersections of a curve, or intersections between two curves (appropriately defined), does not increase. Finally, if the initial curve is simple, then the number of inflection points (appropriately defined) does not increase.
description: Journal of Computational Geometry, Vol. 12 No. 1 (2021)
URBAN ENVIRONMENTAL SERVICES IN DEVELOPING COUNTRIES
Creators: name: Coolidge, Jacqueline G.
name: Porter, Richard C.
name: Zhang, Z. John
name: Coolidge, Jacqueline G.
name: Porter, Richard C.
name: Zhang, Z. John
Publisher: name: Unknown
Year: 1993
Subjects: Resource /Energy Economics and Policy

description: As cities in the developing world grow, their poor residents are being deprived of services, especially water, sewer, and solid waste collection, that can only be purchased expensively in private markets. But the inadequate provision of urban environmental services is not inevitable. A lack of will in this respect is partly due to an ambivalent attitude toward city growth and a widespread feeling that rural-urban migration is excessive. Provision of optimal urban environmental services is also expensive. While the budget problems are exacerbated by foolish pricing policies and cost inefficiencies, it may not be feasible for developing countries to provide all urban residents with optimal service levels. There are many ways to provide basic services to poor residents.
A MATHEMATICAL MODEL FOR DEVELOPING ETHNO-BIOLOGICALLY DIVERSE TROPICAL FORESTS
Creators: name: Brazee, Richard J.
name: Southgate, Douglas
name: Brazee, Richard J.
name: Southgate, Douglas
Publisher: name: Unknown
Year: 1993
Subjects: Resource /Energy Economics and Policy

description: This paper presents a dynamic optimal control model describing the benefits and costs associated with the development of tropical forests rich in plant and animal species and folk knowledge. The model is a framework to assess how various market and institutional incentives might influence both deforestation and the collection of "ethno-biological information."
Millikelvin temperature cryo-CMOS multiplexer for scalable quantum device characterisation
Creators: name: Potočnik, Anton
name: Brebels, Steven
name: Verjauw, Jeroen
name: Acharya, Rohith
name: Grill, Alexander
name: Wan, Danny
name: Mongillo, Massimo
name: Li, Ruoyu
name: Ivanov, Tsvetan
name: Van Winckel, Steven
name: Mohiyaddin, Fahd A.
name: Govoreanu, Bogdan
name: Craninckx, Jan
name: Radu, I. P.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Quantum computers based on solid state qubits have been a subject of rapid development in recent years. In current Noisy Intermediate-Scale Quantum (NISQ) technology, each quantum device is controlled and characterised though a dedicated signal line between room temperature and base temperature of a dilution refrigerator. This approach is not scalable and is currently limiting the development of large-scale quantum system integration and quantum device characterisation. Here we demonstrate a custom designed cryo-CMOS multiplexer operating at 32 mK. The multiplexer exhibits excellent microwave properties up to 10 GHz at room and millikelvin temperatures. We have increased the characterisation throughput with the multiplexer by measuring four high-quality factor superconducting resonators using a single input and output line in a dilution refrigerator. Our work lays the foundation for large-scale microwave quantum device characterisation and has the perspective to address the wiring problem of future large-scale quantum computers.
description: 22+11 pages, 3+5 figures, 1+1 tables
EVALUATING ENVIRONMENTAL IMPACTS OF RURAL DEVELOPMENT PROJECTS
Creators: name: Laarman, Jan G.
name: Laarman, Jan G.
Publisher: name: Unknown
Year: 1993
Subjects: Environmental Economics and Policy

description: Discussions of "sustainable development" call attention to various dimensions of human well-being to be considered concomitantly with traditional financial and economic measures. The challenge of environmental impact analysis (EIA) is to encourage re-design of projects so that net benefits are maximized over some weighting of economic, environmental, and other criteria. To date, development organizations have been under attack by environmentalists for ignoring or conveniently overlooking environmental damages of development projects. Explanations for this include inadequate institutional commitment to link resource conservation with economic development, short time horizons, narrow evaluation criteria, problems of monetary valuation, and problems with implementation of EIAs. The future of EIAs will see a number of changes to correct for these deficiencies. Evaluation of project impacts in isolation may yield to a more comprehensive environmental assessment for entire regions. Projects will not be funded without the assurance of specific policy conditions for environmental management. The technology of EIA will advance with the assistance of geographic information systems and related tools for data management. Cost-benefit analysis of development projects will continue to integrate the work of project economists with engineers, agronomists, and other specialists with knowledge of environmental issues. Methods of multiple criteria evaluation represent an advance over the partial approaches of EIA and cost-benefit analysis. There is considerable support for moving towards longer project cycles and extended planning periods within the total cycle, meaning that EIA can be more extensive and continuous than in the past. Within the development organizations, reconsideration of personnel accountability and reward systems is one of the strategies to raise the prominence of environmental issues. Each year presents more case studies, videos, and other didactic materials for training in EIA. Finally, the question of improving EIA is a matter of demanding stronger institutions for proactive planning, technical analysis, and policy reforms favorable to environmental protection.
Study of Self-Organization Model of Multiple Mobile Robot
Creators: name: Xian-yi, Ceng
name: Shu-qin, Li
name: De-shen, Xia
Publisher: name: arXiv
Year: 2006
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: A good organization model of multiple mobile robot should be able to improve the efficiency of the system, reduce the complication of robot interactions, and detract the difficulty of computation. From the sociology aspect of topology, structure and organization, this paper studies the multiple mobile robot organization formation and running mechanism in the dynamic, complicated and unknown environment. It presents and describes in detail a Hierarchical- Web Recursive Organization Model (HWROM) and forming algorithm. It defines the robot society leader; robotic team leader and individual robot as the same structure by the united framework and describes the organization model by the recursive structure. The model uses task-oriented and top-down method to dynamically build and maintain structures and organization. It uses market-based techniques to assign task, form teams and allocate resources in dynamic environment. The model holds several characteristics of self-organization, dynamic, conciseness, commonness and robustness.
description: www.ars-journal.com
PEASANT COOPERATION FOR WATERSHED MANAGEMENT IN MAISSADE, HAITI: FACTORS ASSOCIATED WITH PARTICIPATION
Creators: name: White, Thomas A.
name: White, Thomas A.
Publisher: name: Unknown
Year: 1992
Subjects: Resource /Energy Economics and Policy

description: Soil erosion is an important contributor to the agricultural decline, poverty, and emigration which characterize rural Haiti today. The numerous soil conservation projects have often ignored indigenous knowledge, techniques and socio-cultural institutions and have not generally resulted in sustained conservation. Limited adoption rates have supported widespread assumptions that peasants were noncooperative, individualistic actors who required substantial external incentives for changing land use behavior. An alternate strategy was utilized in Maissade, Haiti, where peasants now cooperate to treat small, multiple-owner watersheds. Field research was conducted to understand the cooperative action and the socio-economic factors associated with participation ("e.g." cooperation) and defection. Study results indicate that approximately one-half of watershed landholders participate, and a majority of labor is contributed by persons who do not own land in the watersheds. Participants also regularly treat nonparticipant land, and land tenure status is independent of both landholder participation and structure placement. Indicators of landholder exposure to trans-boundary erosion and the potential to economically benefit are associated with participation while the realization of a direct benefit is not. Landholder wealth status is independent of participation though landholders are significantly more wealthy than non- watershed participants. Participation is also strongly associated with membership in farmer cooperatives and labor exchange groups, and the previous adoption soil conservation innovations. The findings challenge conventional wisdom concerning peasant behavior in Haiti and also suggest that support of indigenous cooperative institutions can facilitate the treatment of common environmental problems.
Heavy Quark Radiation in the Quark-Gluon Plasma in the Moliere Theory: Angular Distribution of the Radiation
Creators: name: Blok, B.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We study the effects of adding the Coulomb interactions to the harmonic oscillator (HO) approximation of the heavy parton propagating through the quark-gluon plasma (the extension to QCD of the Molliere theory). We explicitly find the expression for the transverse momentum distribution of the gluon radiation of the heavy quark propagating in the quark gluon plasma in the framework of the Moliere theory, taking into account the BDMPSZ radiation in the harmonic oscillator (HO) approximation, and the Coulomb logarithms described by the additional logarithmic terms in the effective potential. We show that these Coulomb logarithms significantly influence the HO distribution, derived in the BDMPSZ works, especially for the small transverse momenta, filling the dead cone, and reducing the dead cone suppression of the heavy quark radiation (dead cone effect). In addition we study the effect of the phase space constraints on the heavy quark energy loss, and argue that taking into account of both the phase space constraints and of the Coulomb gluons reduces the dependence of the heavy quark energy loss on its mas in the HO approximation.
description: 26 pages, 7 figures 2 tables. arXiv admin note: text overlap with arXiv:2002.11233, references added,a mistake in the numerical code for angular distributions leading to unphysical oscillations corrected
The Maximal Probability that k-wise Independent Bits are All 1
Creators: name: Peled, Ron
name: Yadin, Ariel
name: Yehudayoff, Amir
Publisher: name: arXiv
Year: 2008
Subjects: subject: Probability (math.PR)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 60C05 (Primary), 68W20, 05B15, 94B05, 30E05 (Secondary)

description: A k-wise independent distribution on n bits is a joint distribution of the bits such that each k of them are independent. In this paper we consider k-wise independent distributions with identical marginals, each bit has probability p to be 1. We address the following question: how high can the probability that all the bits are 1 be, for such a distribution? For a wide range of the parameters n,k and p we find an explicit lower bound for this probability which matches an upper bound given by Benjamini et al., up to multiplicative factors of lower order. The question we investigate can be seen as a relaxation of a major open problem in error-correcting codes theory, namely, how large can a linear error correcting code with given parameters be? The question is a type of discrete moment problem, and our approach is based on showing that bounds obtained from the theory of the classical moment problem provide good approximations for it. The main tool we use is a bound controlling the change in the expectation of a polynomial after small perturbation of its zeros.
description: 30 pages, 4 figures. This version adds an appendix with short proofs of some of the cited results
19th Annual East Hampton Sandcastle Contest Flyer, August 7, 2010
Creators: name: Foundation, The Clamshell
Publisher: name: Unknown
Year: 2010
Subjects: East Hampton
Amagansett
Springs
Sand sculpture
Beaches

description: 19th Annual East Hampton Sandcastle Contest Flyer, August 7, 2010.
description: This material was lent to the Long Island Collection by the Springs Historical Society Library for digitization purposes.
Survey and Analysis on the Students' Satisfaction with Undergraduate Teaching Management in Local Agricultural Colleges and Universities:A Case Study of Tianjin Agricultural University
Creators: name: LI Chunjie
name: WANG Yongyi
name: LI Chunjie
name: WANG Yongyi
Publisher: name: Unknown
Year: 2021
Subjects: subject: Agribusiness
subject: Undergraduate teaching management, Satisfaction, Questionnaire survey, Local agricultural colleges and universities

description: Local agricultural colleges and universities undertake the important task of training rural revitalization talents suitable for regional characteristics. Only by mastering students' satisfaction with teaching management can we find the problems existing in teaching management. Taking Tianjin Agricultural University as an example, this paper analyzes the undergraduates' satisfaction with teaching management by questionnaire and SPSS24.0. The results show that undergraduates can actively and actively participate in undergraduate teaching management, but their satisfaction is not high. There are significant differences in teaching evaluation management satisfaction among students of different majors and grades. It is suggested to improve the level of teaching management from the aspects of guiding and cultivating a new concept of management and education, establishing and perfecting a scientific and rigorous teaching management system, strengthening the information-based construction of teaching management and strengthening personnel training.
The Betti numbers of Mbar_{0,n}(r,d)
Creators: name: Getzler, E.
name: Pandharipande, R.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14N10, 14N35

description: We calculate the Betti numbers of the coarse moduli space of stable maps of genus 0 to projective space, using a generalization of the Legendre transform.
description: 19 pages
Berezinskii-Kosterlitz-Thouless transitions in the six-state clock model
Creators: name: Matsuo, Haruhiko
name: Nomura, Kiyohide
Publisher: name: arXiv
Year: 2005
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Classical 2D clock model is known to have a critical phase with Berezinskii-Kosterlitz-Thouless(BKT) transitions. These transitions have logarithmic corrections which make numerical analysis difficult. In order to resolve this difficulty, one of the authors has proposed the method called level spectroscopy, which is based on the conformal field theory. We extend this method to the multi-degenerated case. As an example, we study the classical 2D 6-clock model which can be mapped to the quantum self-dual 1D 6-clock model. Additionally, we confirm that the self-dual point has a precise numerical agreement with the analytical result, and we argue the degeneracy of the excitation states at the self-dual point from the effective field theoretical point of view.
description: 18pages, 7figures
Groscurth, Reinhard (Hrsg.), Kirchenunionen und Kirchengemeinschaft
Creators: name: Heisler, Helge
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 21 Nr. 2 (1972): Ökumenische Rundschau, Band 21, Heft 2
Optimal Point-to-Point Trajectory Tracking of Redundant Manipulators using Generalized Pattern Search
Creators: name: Ata, Atef A.
name: Myo, Thi Rein
Publisher: name: arXiv
Year: 2006
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Optimal point-to-point trajectory planning for planar redundant manipulator is considered in this study. The main objective is to minimize the sum of the position error of the end-effector at each intermediate point along the trajectory so that the end-effector can track the prescribed trajectory accurately. An algorithm combining Genetic Algorithm and Pattern Search as a Generalized Pattern Search GPS is introduced to design the optimal trajectory. To verify the proposed algorithm, simulations for a 3-D-O-F planar manipulator with different end-effector trajectories have been carried out. A comparison between the Genetic Algorithm and the Generalized Pattern Search shows that The GPS gives excellent tracking performance.
description: www.ars-journal.com
Quantum noise and stochastic reduction
Creators: name: Brody, Dorje C.
name: Hughston, Lane P.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In standard nonrelativistic quantum mechanics the expectation of the energy is a conserved quantity. It is possible to extend the dynamical law associated with the evolution of a quantum state consistently to include a nonlinear stochastic component, while respecting the conservation law. According to the dynamics thus obtained, referred to as the energy-based stochastic Schrodinger equation, an arbitrary initial state collapses spontaneously to one of the energy eigenstates, thus describing the phenomenon of quantum state reduction. In this article, two such models are investigated: one that achieves state reduction in infinite time, and the other in finite time. The properties of the associated energy expectation process and the energy variance process are worked out in detail. By use of a novel application of a nonlinear filtering method, closed-form solutions--algebraic in character and involving no integration--are obtained for both these models. In each case, the solution is expressed in terms of a random variable representing the terminal energy of the system, and an independent noise process. With these solutions at hand it is possible to simulate explicitly the dynamics of the quantum states of complicated physical systems.
description: 50 pages
AC relaxation in the Fe8 molecular magnet
Creators: name: Rose, Geordie
Publisher: name: University of British Columbia
Year: 2009

description: We investigate the low energy magnetic relaxation characteristics of the "iron eight" (Fe8) molecular magnet. Each molecule in this material contains a cluster of eight Fe³+ ions surrounded by organic ligands. The molecules arrange themselves into a regular lattice with triclinic symmetry. At sufficiently low energies, the electronic spins of the Fe³+ ions lock together into a "quantum rotator" with spin S = 10. We derive a low energy effective Hamiltonian for this system, valid for temperatures less than Tc ~ 360 mK, where Tc is the temperature at which the Fe8 system crosses over into a "quantum regime" where relaxation characteristics become temperature independent. We show that in this regime the dominant environmental coupling is to the environmental spin bath in the molecule. We show how to explicitly calculate these couplings, given crystallographic information about the molecule, and do this for Fe8- We use this information to calculate the linewidth, topological decoherence and orthogonality blocking parameters. All of these quantities are shown to exhibit an isotope effect. We demonstrate that orthogonality blocking in Fe8 is significant and suppresses coherent tunneling. We then use our low energy effective Hamiltonian to calculate the single-molecule relaxation rate in the presence of an external magnetic field with both AC and DC components by solving the Landau-Zener problem in the presence of a nuclear spin bath. Both sawtooth and sinusoidal AC fields are analyzed. This single-molecule relaxation rate is then used as input into a master equation in order to take into account the many-molecule nature of the full system. Our results are then compared to quantum regime relaxation experiments performed on the Fe8 system.
Lengsfeld, Peter, Ökumenisch handeln - mit halber Kraft?
Creators: name: Urban, Hans Jörg
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 21 Nr. 2 (1972): Ökumenische Rundschau, Band 21, Heft 2
Nanoelectromechanical Systems
Creators: name: Blencowe, M. P.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Nanoelectromechanical systems (NEMS) are nano-to-micrometer scale mechanical resonators coupled to electronic devices of similar dimensions. NEMS show promise for fast, ultrasensitive force microscopy and for deepening our understanding of how classical dynamics arises by approximation to quantum dynamics. This article begins with a survey of NEMS and then describes certain aspects of their classical dynamics. In particular, we show that for weak coupling the action of the electronic device on the mechanical resonator can be effectively that of a thermal bath, this despite the device being a driven, far-from-equilibrium system.
description: Submitted to Contemporary Physics (invited review); 33 pages, 11 figures
On sl(2)-equivariant quantizations
Creators: name: Bouarroudj, S.
name: Ayari, M. Iyadh
Publisher: name: arXiv
Year: 2006
Subjects: subject: Differential Geometry (math.DG)
subject: Quantum Algebra (math.QA)
subject: FOS: Mathematics

description: By computing certain cohomology of Vect(M) of smooth vector fields we prove that on 1-dimensional manifolds M there is no quantization map intertwining the action of non-projective embeddings of the Lie algebra sl(2) into the Lie algebra Vect(M). Contrariwise, for projective embeddings sl(2)-equivariant quantization exists.
description: 09 pages, LaTeX2e, no figures; to appear in Journal of Nonlinear Mathematical Physics
Quantum computation in continuous time using dynamic invariants
Creators: name: Sarandy, M. S.
name: Duzzioni, E. I.
name: Serra, R. M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We introduce an approach for quantum computing in continuous time based on the Lewis-Riesenfeld dynamic invariants. This approach allows, under certain conditions, for the design of quantum algorithms running on a nonadiabatic regime. We show that the relaxation of adiabaticity can be achieved by processing information in the eigenlevels of a time dependent observable, namely, the dynamic invariant operator. Moreover, we derive the conditions for which the computation can be implemented by time independent as well as by adiabatically varying Hamiltonians. We illustrate our results by providing the implementation of both Deutsch-Jozsa and Grover algorithms via dynamic invariants.
description: v3: 7 pages, 1 figure. Published version
Askey-Wilson relations and Leonard pairs
Creators: name: Vidunas, Raimundas
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Algebra (math.QA)
subject: FOS: Mathematics
subject: 33C45, 33D45, 17B37, 05E35

description: It is known that if $(A,B)$ is a Leonard pair, then the linear transformations $A$, $B$ satisfy the Askey-Wilson relations A^2 B - b A B A + B A^2 - g (A B+B A) - r B = h A^2 + w A + e I, B^2 A - b B A B + A B^2 - h (A B+B A) - s A = g B^2 + w B + f I, for some scalars $b,g,h,r,s,w,e,f$. The problem of this paper is the following: given a pair of Askey-Wilson relations as above, how many Leonard pairs are there that satisfy those relations? It turns out that the answer is 5 in general. We give the generic number of Leonard pairs for each Askey-Wilson type of Askey-Wilson relations.
description: 22 pages; corrected version; the example of Section 2 has the normalization consistent with the rest of the paper
Topological swimming in a quantum sea
Creators: name: Avron, J. E.
name: Gutkin, B.
name: Oaknin, D. H.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We propose a quantum theory of swimming for swimmers that are small relative to the coherence length of the medium. The quantum swimming equation is derived from known results on quantum pumps. For a one-dimensional Fermi gas at zero temperature we find that swimming is topological: The distance covered in one swimming stroke is quantized in half integer multiples of the Fermi wave length. Moreover, one can swim without dissipation.
Robotics Vision-based Heuristic Reasoning for Underwater Target Tracking and Navigation
Creators: name: Kia, Chua
name: Arshad, Mohd Rizal
Publisher: name: arXiv
Year: 2006
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: This paper presents a robotics vision-based heuristic reasoning system for underwater target tracking and navigation. This system is introduced to improve the level of automation of underwater Remote Operated Vehicles (ROVs) operations. A prototype which combines computer vision with an underwater robotics system is successfully designed and developed to perform target tracking and intelligent navigation. ...
description: www.ars-journal.com
QCD sum rules for parameters of the $B$-meson distribution amplitudes
Creators: name: Rahimi, Muslem
name: Wald, Marcel
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We obtain new estimates for the parameters $λ_{E}^2$, $λ_H^2$ and their ratio $\mathcal{R} = λ_{E}^2/λ_H^2$, which appear in the second moments of the $B$-meson light-cone distribution amplitudes defined in the heavy-quark effective field theory. The computation is based on two-point QCD sum rules for the diagonal correlation function and includes all contributions up to mass dimension seven in the operator-product expansion. For the ratio we get $\mathcal{R} = (0.1 \pm 0.1)$ with $λ_H^2 = (0.15 \pm 0.05) \, \text{GeV}^2$ and $λ_E^2 = (0.01 \pm 0.01) \, \text{GeV}^2$.
description: 31 pages, 12 figures; corrected format, included source files, improved numerical analysis
Berry Esseen bounds for combinatorial central limit theorems and pattern occurrences, using zero and size biasing
Creators: name: Goldstein, Larry
Publisher: name: arXiv
Year: 2005
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60F05; 60C05

description: Berry Esseen type bounds to the normal, based on zero- and size-bias couplings, are derived using Stein's method. The zero biasing bounds are illustrated with an application to combinatorial central limit theorems where the random permutation has either the uniform distribution or one which is constant over permutations with the same cycle type and having no fixed points. The size biasing bounds are applied to the occurrences of fixed relatively ordered sub-sequences (such as rising sequences) in a random permutation, and to the occurrences of patterns, extreme values, and subgraphs on finite graphs.
description: 23 pages
Spectral properties of nuclear matter
Creators: name: Bozek, P.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We review self-consistent spectral methods for nuclear matter calculations. The in-medium T-matrix approach is conserving and thermodynamically consistent. It gives both the global and the single-particle properties the system. The T-matrix approximation allows to address the pairing phenomenon in cold nuclear matter. A generalization of nuclear matter calculations to the superfluid phase is discussed and numerical results are presented for this case. The linear response of a correlated system going beyond the Hartree-Fock+Random-Phase-Approximation scheme is studied. The polarization is obtained by solving a consistent Bethe-Salpeter equation for the coupling of dressed nucleons to an external field. We find that multipair contributions are important for the spin(isospin) response when the interaction is spin(isospin) dependent.
description: Talk given at the workshop "Progress in Nonequilibrium Green's Functions III" 22-26 August 2005, Kiel
New Intelligent Transmission Concept for Hybrid Mobile Robot Speed Control
Creators: name: Mir-Nasiri, Nazim
name: Hussaini, Sulaiman
Publisher: name: arXiv
Year: 2006
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: This paper presents a new concept of a mobile robot speed control by using two degree of freedom gear transmission. The developed intelligent speed controller utilizes a gear box which comprises of epicyclic gear train with two inputs, one coupled with the engine shaft and another with the shaft of a variable speed dc motor. The net output speed is a combination of the two input speeds and is governed by the transmission ratio of the planetary gear train. This new approach eliminates the use of a torque converter which is otherwise an indispensable part of all available automatic transmissions, thereby reducing the power loss that occurs in the box during the fluid coupling. By gradually varying the speed of the dc motor a stepless transmission has been achieved. The other advantages of the developed controller are pulling over and reversing the vehicle, implemented by intelligent mixing of the dc motor and engine speeds. This approach eliminates traditional braking system in entire vehicle design. The use of two power sources, IC engine and battery driven DC motor, utilizes the modern idea of hybrid vehicles. The new mobile robot speed controller is capable of driving the vehicle even in extreme case of IC engine failure, for example, due to gas depletion.
description: www.ars-journal.com