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Search Results: 1 - 10 of 9761 matches for " Fei; Hennig "
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Discriminating Depression, Physical and Social Anhedonia by Neurotransmitter Related Challenge Tests  [PDF]
Petra Netter, Juergen Hennig
Psychology (PSYCH) , 2016, DOI: 10.4236/psych.2016.73030
Abstract:

The aim of this study was to investigate, if anhedonia, a salient component of depression, shows similar response patterns to neurotransmitter challenge tests as depression, and if the two questionnaire based components Physical (PA) and Social (SA) Anhedonia can be discriminated by differences in drug related size and time of cortisol responses elicited by the specific serotonin (5- HT) and noradrenaline (NA) reuptake inhibitors citalopram and reboxetine and prolactin responses to the dopamine (DA) agonist bromocriptine orally applied to 36 male volunteers in a double blind balanced cross-over design. Analyses of variance applied to placebo corrected hormone responses revealed that low and late DA responses were characteristics of global Depression and of Physical Anhedonia, and that low DA responses were associated with high NA responses in PA, and with low 5-HT responses in SA. These patterns were explained by differences in transmitter production and receptor sensitivities and proved to be suitable to discriminate PA from SA and from global depression by analysing neurochemical response patterns rather than single means of variables.

Engaging hospitals to meet tuberculosis control targets in China: using the Internet as a tool to put policy into practice
Wang,Lixia; Liu,Xiaoqiu; Huang,Fei; Hennig,Cornelia; Uplekar,Mukund; Jiang,Shiwen;
Bulletin of the World Health Organization , 2010, DOI: 10.1590/S0042-96862010001200015
Abstract: tuberculosis (tb) services in china are provided through a large network of tb dispensaries. even though hospitals are not as well placed to follow recommended standards of tb care, a significant proportion of people with tb symptoms seek care from hospitals. in spite of having a policy and mandate in place, the ministry of health had little success in encouraging hospitals to refer suspected tb cases to dispensaries. following the epidemic of severe acute respiratory syndrome in 2003, the government set up a nationwide internet-based communicable diseases reporting system. this achieved productive collaboration between hospitals and tb dispensaries. from 2004 to 2007, the percentage of tb suspects and patients needing referral from hospitals who arrived in tb dispensaries increased substantially from 58.7% to 77.8% and the contribution of hospitals to diagnosing sputum smear-positive tb cases doubled from 16.3% to 32.9%. using the internet-based reporting system, hospitals in china contributed to finding about one third of all sputu m smear-positive tb cases and helped meet the global tb control target of detecting 70% of such cases. based on the data available from routine surveillance facilitated by this internet-based system, this paper details the process and outcomes of strengthening collaboration between hospitals and tb dispensaries using the internet as a tool and its potential application to other country settings.
A Saga for Dinner: Landscape and Nationality in Icelandic Literature
Reinhard Hennig
Ecozon@ : European Journal of Literature, Culture and Environment , 2011,
Abstract: Iceland’s attempted industrialisation through an expansion of hydropower andaluminium smelters can lead to a significant reshaping of the country’slandscapes. There has been considerable resistance against such plans since the1970s, culminating in the debate about the Kárahnjúkar project between 2001and 2006. The book Draumalandie. Sjálfshjálparbók handa hr ddri tjóe[Dreamland. A Self-Help Manual for a Frightened Nation] by the writer AndriSn r Magnason has been particularly influential. It combines ecologicalconsciousness with an appreciation of Iceland‘s literary tradition and history.Thus it displays a view of landscape which connects nature preservation closelyto cultural achievements and to national sovereignty. This perception oflandscape originates from the assumption that Iceland experienced a golden agefrom the beginning of colonisation in the Viking age until the subordinationunder the Norwegian and later Danish kings in the 13th century, which led to anall-embracing degeneration. Nationalist poets such as Jónas Hallgrímsson inthe 19th century based their demands for independence on Iceland‘s medievalsaga literature and the country‘s landscapes. These seemed to provide evidencefor a high culture in unity with nature during the time of the Commonwealth.Although the historical reliability of the sagas is doubtful, they are still used asan important argument in Draumalandie. Now the narratives as such are put inthe foreground, as they can give value and meaning to the landscapes and placesthey describe. Thus a turn from a realistic to a more constructivist perception oflandscape can be observed in contemporary Icelandic environmental literature.
Substance, Reality, and Distinctness
Boris Hennig
Prolegomena , 2008,
Abstract: Descartes claims that God is a substance, and that mind and body are two different and separable substances. This paper provides some background that renders these claims intelligible. For Descartes, that something is real means it can exist in separation, and something is a substance if it does not depend on other substances for its existence. Further, separable objects are correlates of distinct ideas, for an idea is distinct (in an objective sense) if its object may be easily and clearly separated from everything that is not its object. It follows that if our idea of God is our most distinct idea, as Descartes claims, then God must be a substance in the Cartesian sense of the term. Also, if we can have an idea of a thinking subject which does not in any sense refer to bodily things, and if bodily things are substances, then mind and body must be two different substances.
Nucleus management with Fishhook
Hennig A
Indian Journal of Ophthalmology , 2009,
Abstract: The fishhook technique developed at the Lahan eye hospital is widely used in Nepal and other countries. Its specialty is the extraction of the nucleus with a bent 30-G needle (Fishhook) out of the capsular bag and the self-sealing tunnel. All sizes of nuclei can be extracted. The fishhook technique has a short learning curve, a low complication rate and provides excellent immediate visual outcome. It is cost-effective and has proved to be useful also for high-volume cataract surgery and thus can play an important role in the reduction of cataract blindness.
Sutureless Non-phaco Cataract Surgery: A Solution to Reduce Worldwide Cataract Blindness?
Albrecht Hennig
Community Eye Health Journal , 2003,
Abstract: The Search for Appropriate Sutureless Cataract Surgery. During the last decade, in industrialised countries phacoemulsification has largely replaced ab-externo extracapsular cataract extraction with posterior chamber intraocular lenses (ECCE/PC IOL) with sutures. The small self-sealing phaco incision provides rapid visual rehabilitation, and the surgery is increasingly done on an outpatient basis. However, in developing countries phacoemulsification is performed only on selected patients, usually those able to pay high treatment charges. The reasons for this include the cost of a phaco machine and consumables such as foldable IOLs. Until now, phacoemulsification has played a very limited role in the reduction of cataract blindness in low income countries. Therefore, eye surgeons in developing countries are searching for alternatives to phacoemulsification. We need a surgical technique which is easy to learn, provides an immediate good uncorrected visual outcome, and is affordable to most cataract patients. Such a technique would advance cataract surgery in low income countries and contribute to reaching the goal of VISION 2020: The Right to Sight.
Directed transient long-range transport in a slowly driven Hamiltonian system of interacting particles
Dirk Hennig
Physics , 2008, DOI: 10.1016/j.physleta.2008.08.063
Abstract: We study the Hamiltonian dynamics of a one-dimensional chain of linearly coupled particles in a spatially periodic potential which is subjected to a time-periodic mono-frequency external field. The average over time and space of the related force vanishes and hence, the system is effectively without bias which excludes any ratchet effect. We pay special attention to the escape of the entire chain when initially all of its units are distributed in a potential well. Moreover for an escaping chain we explore the possibility of the successive generation of a directed flow based on large accelerations. We find that for adiabatic slope-modulations due to the ac-field transient long-range transport dynamics arises whose direction is governed by the initial phase of the modulation. Most strikingly, that for the driven many particle Hamiltonian system directed collective motion is observed provides evidence for the existence of families of transporting invariant tori confining orbits in ballistic channels in the high dimensional phase spaces.
Current control in a tilted washboard potential via time-delayed feedback
Dirk Hennig
Physics , 2009, DOI: 10.1103/PhysRevE.79.041114
Abstract: We consider motion of an overdamped Brownian particle in a washboard potential exerted to a static tilting force. The bias yields directed net particle motion, i.e. a current. It is demonstrated that with an additional time-delayed feedback term the particle current can be reversed against the direction of the bias. The control function induces a ratchet-like effect that hinders further current reversals and thus the particle moves against the direction of the static bias. Furthermore, varying the delay time allows also to continuously depreciate and even stop the transport in the washboard potential. We identify and characterize the underlying mechanism which applies to current control in a wide temperature range.
Existence of localised normal modes in nonlinear lattices
Dirk Hennig
Physics , 2015, DOI: 10.1103/PhysRevC.92.054908
Abstract: We prove the existence of exponentially localised and time-periodic solutions in general nonlinear Hamiltonian lattice systems. Like normal modes, these localised solutions are characterised by collective oscillations at the lattice sites with a uniform time-dependence. The proof of existence uses the comparison principle for differential equations to demonstrate that at each lattice site every half of the fundamental period of oscillations, contributing to localised solutions of the nonlinear lattice, is sandwiched between two oscillatory states of auxiliary linear equations. For soft (hard) on-site potentials the allowed frequencies of the in-phase (out-of-phase) localised periodic solutions lie below (above) the lower (upper) value of the linear spectrum of phonon frequencies. By varying a control parameter the exponential decay of the localised states can be tuned continuously.
When the beat goes off: Mutually interacting complex systems
Holger Hennig
Physics , 2013,
Abstract: While musical performances are determined by many factors such as the musical genre and interpretation, rhythmic synchronization is at the foundation of musical interaction. Here, we study the statistical nature of the mutual interaction of two humans when playing rhythms. We find that the interbeat intervals (IBIs) of both laypeople and professional musicians exhibit scale-free (power law) cross-correlations. Surprisingly, the next beat to be played by one person is dependent on the entire history of the other persons IBIs on time scales up to several minutes. A general stochastic model for Mutually Interacting Complex Systems (MICS) is introduced which suggests a physiologically motivated explanation for the occurrence of scale-free cross-correlations. In addition, The MICS model may be applicable to study the dynamics of other complex systems where scale-free cross-correlations have been observed, including econophysics, physiological time series and collective behavior of animal flocks. The interdisciplinary study provides an understanding of fundamental characteristics of timing and synchronization at the inter-brain level and leads directly to applications in audio engineering.
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