bluuebunny/crossref_metadata_2025 huggingface dataset:
Charmonium production in pPb and PbPb collisions at 5.02 TeV
with CMS
Authors: Martín Blanco Javier
Published: February 2018

Charmonium states, such as the J/ψ and ψ(2S) mesons, are excellent probes of the deconfined state of matter, the Quark-Gluon Plasma (QGP) created in heavy ion collisions. In addition, the measurements in pPb collisions allow to study the cold nuclear matter effects, being crucial to disentangle these from the QGP-related effects in PbPb collisions. In this talk the new nuclear modification factor RAA of prompt and nonprompt J/ψ in PbPb collisions at [see formula in PDF] = 5.02 TeV were presented over a wide kinematic range (3 < pT < 50 GeV/c, |y| < 2.4), and fine event-centrality intervals. The results were compared to those at 2.76 TeV over a similar kinematic range. In addition, new prompt ψ(2S) RAA results at 5.02 TeV were reported. Finally the final prompt and nonprompt J/ψ results, as well as preliminary ψ(2S) results, in pPb collisions at 5.02 TeV, were discussed.
Production cross-sections of prompt ⋀c+ in pPb collisions at √SNN = 5 TeV with the LHCb detector
Authors: Sun Jiayin
Published: February 2018

The study of the nuclear modification factor and the forward/backward asymmetry in pPb collisions at [see formula in PDF] = 5 TeV is extended to the [see formula in PDF] baryon, providing the first measurement of charmed baryon production in pA collisions. The result is compared to the analogous measurement on charmed mesons, providing an insight on the production mechanism of charmed hadrons.
Quarkonium production in Pb-Pb collisions at √SNN = 5.02 TeV with ALICE
Authors: Francisco Audrey
Published: February 2018

Ultra-relativistic heavy-ion collisions at the Large Hadron Collider provide a unique opportunity to study the properties of matter at extreme energy densities where a phase transition from the hadronic matter to a deconfined medium of quarks and gluons, the Quark-Gluon Plasma (QGP) is predicted. Among the prominent probes of the QGP, heavy quarks play a crucial role since they are created during the initial stages of the collision, before the QGP formation, and their number is conserved throughout the partonic and hadronic phases of the collision. The azimuthal anisotropy of charmonium production, quantified using the second harmonic Fourier coefficient (referred to as elliptic flow), provides important information on the magnitude and dynamics of charmonium production. Measurements of the quarkonium nuclear modification factor at forward rapidity and J/ψ elliptic flow in Pb-Pb collisions as a function of centrality, transverse momentum and rapidity will be presented and compared to different collision energy results and available theoretical calculations.
Exploration of particle production mechanisms via angular correlations of π, K, p, Λ with ALICE in pp collisions at √S = 7 TeV
Authors: Janik Małgorzata Anna
Published: February 2018

Two-particle correlations as a function of Δη and Δφ are used in many colliding systems to study a wide range of physical phenomena. Examples include the collective behavior of the quark-gluon plasma medium, jets, quantum statistics or Coulomb effects, conservation laws, and resonance decays. In this work, measurements of the correlations of identified particles and their antiparticles (for π, K, p, Λ) are reported in pp collisions at √s = 7 TeV at low transverse momenta. The analysis reveals differences in particle production between baryons and mesons. The correlation functions for mesons exhibit the expected peak dominated by the effects of mini-jet fragmentation and are reproduced well by general purpose Monte Carlo generators. For baryon pairs where both particles have the same baryon number, an anti-correlation structure is observed instead of a peak centered at (Δη, Δφ) = (0, 0); an observation which presents a challenge to models typically used to describe pp data (PYTHIA, PHOJET). This baryon anti-correlation is further interpreted in the context of baryon production mechanisms in the fragmentation processes.
Particle Production and Collectivity in High Multiplicity pp and pPb at the LHC
Authors: Stephans George S. F.
Published: February 2018

Recent unexpected evidence for collectivity in high multiplicity pp and pPb collisions at LHC energies has challenged the notion that such small systems do not exhibit any of the properties that have been used to study the quark gluon plasma in heavy ion collisions. An overview of recent results concerning particle production and collectivity in such collisions using the CMS detector at the LHC is presented.
A Novel Analysis Method of Pre-adjusting System for Self-interference Cancellation in Analog Domain
Authors: Li Hui-Hui , Chen Nan , He Xiandeng
Published: February 2018

Pre-adjusting system, which computes the attenuation coefficients of self-interference cancellation, is one of the most important parts in a practical self-interference cancellation system. In this paper, a new way is given to analyze the pre-adjusting system in analog domain, and a clear theoretical analysis is carried out. Meanwhile, a method for solving the optimal attenuation vector is introduced. The simulation results show that the Interference Cancellation Ratio(ICR) can reach up to 62.8 dB in an ideal environment and 50.4 dB in a real environment, which are much better than the ordinary demand of 40 dB in analog domain. Finally, an amplitude modulation signal is verified in our method, with shows good performance, too.
A Quantum Cryptography Communication Network Based on Software Defined Network
Authors: Zhang Hongliang , Quan Dongxiao , Zhu Changhua , Li Zhigang
Published: February 2018

With the development of the Internet, information security has attracted great attention in today’s society, and quantum cryptography communication network based on quantum key distribution (QKD) is a very important part of this field, since the quantum key distribution combined with one-time-pad encryption scheme can guarantee the unconditional security of the information. The secret key generated by quantum key distribution protocols is a very valuable resource, so making full use of key resources is particularly important. Software definition network (SDN) is a new type of network architecture, and it separates the control plane and the data plane of network devices through OpenFlow technology, thus it realizes the flexible control of the network resources. In this paper, a quantum cryptography communication network model based on SDN is proposed to realize the flexible control of quantum key resources in the whole cryptography communication network. Moreover, we propose a routing algorithm which takes into account both the hops and the end-to-end availible keys, so that the secret key generated by QKD can be used effectively. We also simulate this quantum cryptography communication network, and the result shows that based on SDN and the proposed routing algorithm the performance of this network is improved since the effective use of the quantum key resources.
Electromagnetic Pulse Generated by a Horizontal Electric Dipole over a Perfect Conductor Covered with a Dielectric Layer
Authors: Zheng Juan , He Tong , Cao Ping , Lin Zhuhong , Li Kai
Published: February 2018

In this paper, the electromagnetic pulse due to a delta-function current excitation has been derived on the planar surface of a perfect conductor coated by a dielectric layer. The approximate expression of wave component is obtained when both the transmitting source and the receiving antennas are located on the surface of the dielectric. When the thickness of the intermediate layer is subjected to the condition of k1l<<0.6, this physical model is applied to the microstrip circuit. Analysis and computations of the wave components are carried out on the microstrip circuit, including the surface trapped wave vector which had been ignored in former studies. It is shown that the trapped-surface-wave terms should have been taken into consideration as the main contribution in total transient field in the far-field radiations.
Research and Mass Deployment of Non-cognitive Authentication Strategy Based on Campus Wireless Network
Authors: Huangfu Dapeng , Tian Xiaoping , Wang Xingjian , Chen Ping
Published: February 2018

With the rapid development of Internet +, the dependence on wireless networks and wireless terminals are increasing. Campus wireless network has become the main network of teachers and students in campus on the internet. As there are uneven clients and a wide variety of intelligent terminals now. Simplified authentication and network security become the most urgent problem for wireless network. This paper used the Portal + Mac authentication method to realize the non-cognitive authentication of teachers and students on basis of the analysis of the advantages and disadvantages of mainstream authentication of campus wireless network, such as 802.1X authentication, Portal authentication, Mac authentication and DHCP authentication. Teachers and students only need portal certification at the first time, then surf the internet with non-perceived authentication at the second time and later. This method increases network security, and is better to meet the needs of teachers and students.
Digitized Modeling and Machining Simulation of Equal Base Bevel Gear
Authors: Wang Bin , He Yunpeng , Feng Peiyao , Sun Xun , Xu Aijun , Li Jubo , Li Tianxing , Jia Xinjie , Zhang Bo
Published: February 2018

In order to achieve the NC machining to the equal base circle bevel gear with a standard cutter, to plan the machining path efficiently and to predict machining interference, based on the equal base circle bevel gear theory, the machining coordinate system for the bevel gear was established, according to gear tooth surface equations of the bevel gears, the tooth surface discretization function was derived, and through the calculation and get the discrete points, the gear surface was modeled in the software UG, and then the planning of the machining path, automatic programming and simulation processing were done. At last, simulation processing, analysis and comparison to the gear surface were carried on with the software VERICUT, improved that the gear surface modeling and NC machining methods were correct and feasible.
Research on Dynamic Graph Target Tracking Method Fusing the Color Local Entropy
Authors: Zhang Junchang , Xia Chenyang , Hu Leili , Zhou Yanling
Published: February 2018

Focusing on the problems of target deformation, occlusion, background interference and rotation, a robust video tracking method is proposed in this paper, which is based on the superpixels and dynamic graph matching. Firstly, to make the superpixels edge fit better and structure tighter, the local gradient feature is fused into the simple linear iterative clustering (SLIC) method. Secondly, the candidate target superpixels set is generated by Graph Cuts and to obtain more accurate foreground superpixels set, the LASVM classification results are fused into the Graph Cuts energy function. Thirdly, in order to make the proposed tracker more robust, the color local entropy is fused into the diagonal elements of the affinity matrix. Experiment results show that the proposed algorithm has strong robustness and better tracking accuracy.
Improvement of Ultrasonic Distance Measuring System
Authors: Jiang Yu , Song Rui , Yuan Mingting
Published: February 2018

This paper mainly introduces a kind of ultrasonic distance measuring system with AT89C51 single chip as the core component. The paper expounds the principle of ultrasonic sensor and ultrasonic ranging, hardware circuit and software program, and the results of experiment and analysis.The hardware circuit based on SCM, the software design adopts the advanced microcontroller programming language.The amplitude of the received signal and the time of ultrasonic propagation are regulated by closed loop control. [1,2]The double closed loop control technology for amplitude and time improves the measuring accuracy of the instrument. The experimental results show that greatly improves the measurement accuracy of the system.
Research and application of heat map system for resource allocation of flood control based on GIS
Authors: Li Weijian , Xie Long , Lei Yong , Guo Yu , Zhou Xiaoqing
Published: February 2018

Flood control resources are valuable resources for flood control and rescue, providing the flood relief work with the most direct rescue workers, tools as well as equipment. With the continuous development of society and economy, local governments at all levels, especially those of which are seriously affected by flood and waterlogging, have raised higher requirements for the allocation of flood control resources. When disasters such as flood and waterlogging happen, a reasonable allocation of flood control resources can quickly deploy relevant flood control resources for the disaster relief work and play an important role in reducing damage to personnel and property loss to a minimum, which stabilizes and promotes the socioeconomic development. Research of resource allocation of flood control based on GIS (Geographic Information System) is gradually becoming an important technical support for scientific resource allocation. This research focuses on the introduction of the characteristics and advantages of the heat map system based on GIS and its application in resource allocation of flood control. The important role the heat map system based on GIS plays in allocation and management of flood control resources is introduced in the applying case of Guangzhou.
Analysis on stress state of box-girder web under prestressing effect
Authors: Yin Haijun , Li Ziqing , Hao Xianwu , Zhao Baojun
Published: February 2018

In order to study the effect of prestressed box girder webs stresss state, determining the stress distribution within a web, research and analysis of vertical prestressed box girder, curved beam prestressed sensitivity under the web. Establishing the finite element model of the box girder web vertical prestressing effect is analyzed, results show that the principal tensile stress of the web is sensitive to the vertical prestress, applying the vertical prestress can effectively reduce the principal tensile stress of the web; with the decrease of the effective vertical prestress, the neutral axis above the principal compressive stress decreases rapidly, while below the neutral axis decreases relatively slow; Under the same vertical preloading stress level, the roots of cross section of the compressive stress of web reserves than L / 4 section of the web. Calculation and analysis of curved beam under bending point, different bending angles and bending radius of principal stress effect on the web, Results show that the set of curved beam web when the curved beam bending stress concentration easily, appear the main tensile stress; Increase the bending radius can effectively reduce beam cross-section of web principal tensile stress, along with the rising of the next corner, principal tensile stress peak value increases gradually, thus setting bending beam, should try to reduce the bending angle.
Design of fresh food sensory perceptual system for cold chain logistics
Authors: Zhang Ying , Cheng Ruqi , Chen Shaohui
Published: February 2018

According to the present stage low-level information of China's cold chain preservation, designed a kind of fresh food sensory perceptual system for cold chain logistics based on Internet of things. This system highly integrated applied many technologies such as the Internet of things technology, forecasting technology for fruits and vegetables preservation period, RFID and Planar bar code technology, big data and cloud computing technology and so on.Designed as a four-layer structure including sensing layer, network layer, control layer and user layer. The system can implement the real-time temperature and humidity environment parameters monitoring and early warning of the whole cold chain logistics for fresh agricultural products from picking, storage, transportation and processing link. It greatly improved the information level of cold chain circulation in our country and has a strong marketing value.
Analysis of character network heat based on web retrieval technology
Authors: Wu Minglei , Pan Jingchang
Published: February 2018

Information technology is now developing rapidly, the Internet has also obtained widespread popularization. The amount of information on the network is increasing exponentially, whose information sources are widely distributed and varied. If the information can’t be managed in an orderly manner, it will be difficult for the user to extract the information they need from such a massive amount of information. Although the current search engine give people a lot of convenience in searching for information, but the search engine can’t reflect the user’s personalized information demand with facing a wide variety of users with different information needs, knowledge background and interest. In this paper, a recommendation method based on search results with java as a technology is implemented. This method takes Baidu hot people ranking as an example for verifying.
Data security and risk assessment in cloud computing
Authors: Li Jing , Li Qinyuan
Published: February 2018

Cloud computing has attracted more and more attention as it reduces the cost of IT infrastructure of organizations. In our country, business Cloud services, such as Alibaba Cloud, Huawei Cloud, QingCloud, UCloud and so on are gaining more and more uses, especially small or median organizations. In the cloud service scenario, the program and data are migrating into cloud, resulting the lack of trust between customers and cloud service providers. However, the recent study on Cloud computing is mainly focused on the service side, while the data security and trust have not been sufficiently studied yet. This paper investigates into the data security issues from data life cycle which includes five steps when an organization uses Cloud computing. A data management framework is given out, including not only the data classification but also the risk management framework. Concretely, the data is divided into two varieties, business and personal information. And then, four classification levels (high, medium, low, normal) according to the different extent of the potential adverse effect is introduced. With the help of classification, the administrators can identify the application or data to implement corresponding security controls. At last, the administrators conduct the risk assessment to alleviate the risk of data security. The trust between customers and cloud service providers will be strengthen through this way.
Petri net methodology for solving healthcare management issues
Authors: Khushk Abdul Rauf , Li Xiaozhong
Published: February 2018

Various approaches of Petri nets can be achieved as system security and information flow in the healthcare recording system inside any medical or health-related business. Petri net system formal modeling is essential as well as important to track down the records and secure information inside a preformed health organization. In this paper, we mainly focused on the formal model Petri net which security mechanism is controlled by public key encryption where PN based modeling is preferred. This Petri net is a mathematical modeling to solve graphical notation for step by step processes that include choice, repetition, and circumstantial execution. Petri nets offer widely mathematical applications of discrete and continuous event execution semiotics, with an efficient mathematical analysis processing theory. We sure that our formal model will lay a solid foundation to minimize the risks and overcome the security risks in the healthcare industry.
Influence of dash-pot with controllable damping coefficient on damping efficiency of TMDI
Authors: Lazarek Mateusz , Brzeski Piotr , Perlikowski Przemyslaw
Published: February 2018

In this paper we study the dynamics of two degree freedom system, which is consist of main body and tuned mass damper with inerter (TMDI). We add the dash-pot with variable damping coefficient to TMDI to study the overall efficiency of the device. The shape of non-linear characteristic of the dash-pot is dependent on one control parameter which governs the steepness of the function and the value of damping coefficient changes according to the relative displacement or velocity between main mass and tuned mass damper. We show the two parameters diagrams showing the maximum amplitude of the main body versus frequency of excitation of main body and controlling parameter.
Dynamics modeling and performance analysis of underwater vehicles based on the Boltzmann-Hamel equations approach
Authors: Jarzębowska Elżbieta , Cichowski Michał
Published: February 2018

The paper addresses dynamics modeling of underwater vehicles, which are typical examples of variable mass and configuration mechanical systems. Specifically, we address inertia–based propelled vehicles, whose mass changes due to change of water amount in their water tanks and their configuration changes due to movable mass enabling maneuvers. They can be additionally subjected to constraints, which are imposed due to their desired performance, tracking pre-specified motions or are control constraints implying underactuation. The paper presents a new approach to variable mass and configuration systems modeling, which is based upon Boltzmann-Hamel equations derived in quasi-coordinates. The dynamics framework based upon quasi-coordinates results in dynamic models suitable for performance analysis and model-based control applications. It serves free or constrained variable mass and configuration systems modeling. The example researched in the paper is an underwater vehicle, which is purely inertia–based propelled. The theoretical development is illustrated with simulation studies of dynamical behavior and performance of the underwater vehicle model moving a specified trajectory.
Moving mass problem: Complete solution with the effect of initial conditions
Authors: Dimitrovová Zuzana
Published: February 2018

In this contribution, recently published new semi-analytical solution for the moving mass problem [1] is extended to account for the transient terms that adapt the initial part of the complete solution in a way to match the initial conditions. It is assumed that a mass and a vertical force with harmonic component move by constant velocity along a horizontal infinite beam posted on a two-parameter visco-elastic foundation. The new semi-analytical solution is presented as a sum of truly steady-state terms, harmonic terms induced by the moving mass and transient terms adapting the initial conditions. Closed-form formula is given for the first two types of vibrations. It is concluded that transient terms have in most cases almost negligible effect on the full solution and that the initial conditions can significantly affect the amplitudes of the induced harmonic vibrations, but the induced frequencies are kept without any changes.
The shaker parameters estimation, a first step to virtual testing
Authors: Martino Jonathan , Harri Kristof
Published: February 2018

The increase in computing resources makes simulation methods more affordable. The processing speed allows real time analysis or even more rapid tests analysis offering a real tool for test prediction and design process optimization. Vibration tests are no exception to this trend.

The so called 'Virtual Vibration Testing' offers solution among others to study the influence of specific loads such as optimized signals, to better anticipate the boundary conditions between the exciter and the structure under test or to study the influence of small changes in the structure under test.

This article will first present a virtual vibration test modeling with a main focus on the shaker model and will afterwards present the experimental parameters determination.

The classical way of modeling a shaker is to consider the shaker as a simple mechanical structure augmented by an electrical circuit that makes the shaker move. The developed model is a two degrees of freedom mechanical lumped parameters model and the electrical circuit model takes the coil impedance and the dynamic back-electromagnetic force into account. The establishment of the equations of this model, describing the dynamics of the shaker, is presented in this article and is strongly related to the internal physical quantities of the shaker. Those quantities will be reduced into global parameters which will be estimated through experiments in order to get a fully functional shaker model.

An experimental modal analysis will also be carried out to extract the modal parameters of the shaker and to combine them with the electrical measurements.

Finally this article will conclude with an experimental validation of the model.
Comparison of 1D and 2D solutions for a beam under transverse
impact
Authors: Adámek Vítězslav
Published: February 2018

The problem of non-stationary vibration of an elastic beam caused by a transverse impact loading is studied in this work. In particular, two different approaches to the derivation of analytical solution of the problem are compared. The first one is based on the Timoshenko beam theory, the latter one follows the exact two-dimensional theory. Both mentioned methods are used for finding the response of an infinite homogeneous isotropic beam. The obtained analytical results are then compared and their agreement is discussed in relation to main factors, i.e. the beam geometry, the character of loading and times and points at which the beams responses are studied.
The behavior of bilinear impact oscillators subjected to random forcings
Authors: Rounak Aasifa , Gupta Sayan
Published: February 2018

A multistable regime of a bilinear vibro-impact oscillator in the presence of noise has been studied, for which relatively lesser attractors coexist with a well-defined basin boundary structure in the phase space. The effect of adding parametric noise in this model has been investigated and the switching that the system undergoes between the basins of its different attractors has been examined.
A Stochastic source model for the 2015 Mw 7.9 Gorkha, Nepal, Earthquake using Multi-Dimensional Ensemble Empirical Mode Decomposition technique
Authors: Sangeetha S , Raghukanth S.T.G
Published: February 2018

The present study aims at developing a new strategy to model the spatial variability of slip on the rupture plane using multi-dimensional ensemble empirical mode decomposition (MEEMD) technique. Here, the earthquake slip distribution is split into finite number of empirical modes of oscillation called the intrinsic mode functions (IMFs). This help in identifying the fluctuation component and trend in the slip data. The trend is positive and characterizes the nonstationary mean of the slip distribution. The fluctuation component can be modelled as a stationary random field using an exponential power spectral density function. The trend can be modeled as an elliptic patch. This new technique is demonstrated for the slip distribution of the recent Nepal Earthquake, 2015. It is observed that the new model can be used to simulate the spatial complexity of slip distribution of any earthquake.
Dynamics of SMA micro-actuator in biomechanical system
Authors: Rusinek Rafal , Weremczuk Andrzej , Szymanski Marcin , Warminski Jerzy
Published: February 2018

In this paper the polynomial model of shape memory alloy is used to characterise properties of a micro-actuator which is applied as a new middle ear prosthesis. A two degrees of freedom model of the reconstructed middle ear is solve by means of multiple time scales method. The system has various behaviours near the primary resonance depending on ambient temperature. The special case when relative temperature θ = 1.0 characterises untypical resonance curve. Increasing temperature to the normal human body one the resonance curves are typical. Then the system has only one periodic solution if the excitation is not too strong.
Optimization of the Vibro-Impact Capsule System for Promoting Progression Speed
Authors: Maolin Liao , Yao Yan , Yang Liu
Published: February 2018

This paper studies the dynamics of vibro-impact capsule systems with one-sided and double-sided constraints under variations of control parameters, including frequency of excitation, mass ratio, and stiffness ratio. The aim of this study is to optimize the progression speed of the capsule system. Extensive comparisons reveal that the capsule system with one-sided constraint is better than the one with double-sided constraints in terms of progression speed. Moreover, the system’s period-one one-right-impact motion is proved as the ideal vibration condition due to its lowest energy consumption for impacts. According to the dynamic analyses of control parameters, an inner mass with its weight similar as the weight of capsule and a right constraint with a relative weak stiffness are beneficial for further accelerating the capsule system forwards.
Dynamic Characteristics of Rotors on Passive and Active Thrust Fluid-film Bearings with Fixed Pads
Authors: Babin Alexander , Savin Leonid , Majorov Sergey
Published: February 2018

Application of fluid-film bearings in rotor machines in many cases could have no alternative due to obvious advantages when compared to roller element bearings. Integration of information technology in mechanical engineering resulting in emergence of a new field of research – mechatronic bearings which allowed tracking condition of the most important parts of a machine and adjusting operational parameters of the system. Application of servo valves to control the flow rate through a fluid-film bearing is the most universal and simple way of rotor’s position control due to relative simplicity of modelling and absence of need to radically change the design of conventional hydrodynamic bearings. In the present paper numerical simulations of passive (conventional as opposed to mechatronic) and active hybrid thrust fluid-film bearings with a central feeding chamber are presented, that are parts of a mechatronic rotor-bearing node. Numerical model of an active thrust bearing is based on solution of equations of hydrodynamics, rotor dynamics and an additional model of a servo valve. Various types of control have been investigated: P, PI and PID control, and the dynamic behaviour of a system has been estimated under various loads, namely static, periodic and impulse. A design of a test rig has been proposed to study passive and active thrust fluid-film bearings aimed at, among other, validation of numerical results of active bearings simulation.
Middle ear vibrations with SMA prosthesis. Experimental research
Authors: Rusinek Rafal , Szymanski Marcin , Teresinski Grzegorz
Published: February 2018

The paper focuses on experimental research of a middle ear prosthesis made of shape memory alloy. The prosthesis provides better adjustment to individual patient than classical prosthesis. The shape memory prosthesis is implemented to a fresh temporal bone and vibrations of the round window are recorded by means of the Laser Doppler Vibrometer. Finally, the results are presented in the form of transfer function and compared to the intact and damaged middle ear.
The nonlinear thermomechanical vibration of a functionally graded beam on Winkler-Pasternak foundation
Authors: Marinca Vasile , Herisanu Nicolae
Published: February 2018

By using the Optimal Auxiliary Functions Method (OAFM), nonlinear free thermomechanical vibration of functionally graded beam (FGB) on Winkler-Pasternak elastic foundation is studied. Based on von Karman geometric nonlinearity, on Euler-Bernoulli beam theory and also on Galerkin procedure we obtain a second-order nonlinear differential equation with quadratic and cubic nonlinear terms. The results obtained by means of OAFM are compared and shown to be in an excellent agreement with available solutions known in the literature.
Study on Singular Spectrum Analysis as a data-driven technique for damage diagnosis. Comparison between time and frequency domain.
Authors: Garcia David , Trendafilova Irina
Published: February 2018

Vibration-based Structural Health Monitoring methodologies have been developed in many different applications with the aim of damage diagnosis. Recently, purely data-driven methods have been gained popularity because these methods do not assume any linearity or model in their analysis. Data-driven methods use the measured vibration signals as data-input to extract features that can conclude obtain useful information for the damage diagnosis. In this work a methodology based on Singular Spectrum Analysis (SSA) technique is presented which decomposes the measured vibration responses in a certain number of principal components which reveal the rotational patterns at any frequency in the motion. One of the steps of the methodology is to create a reference state where the observations can be compared for damage assessment. The data used to create the reference state determines how the information is represented in the reference state and therefore how meaningful and informative are the feature vectors for damage assessment. This study presents of the effect of the data representation considered on the creation of the reference state when the data is introduced in the time or frequency domain. The results obtained are different depending on the signal representation and hence they should have different interpretation when the state is created based on vibratory signals represented in the time or frequency domain.
Proportional-Derivative Control of Stick-Slip Oscillations in Drill-Strings
Authors: Lin Wei , Liu Yang
Published: February 2018

Stick-slip oscillation in drill-string is a universal phenomenon in oil and gas drilling. It could lead to the wear of drill bit, even cause catastrophic failure of drill-strings and measurement equipment. Therefore, it is crucial to study drilling parameters and develop appropriate control method to suppress such oscillation. This paper studies a discrete model of the drill-string system taking into account torsional degree-of-freedom, drill-string damping, and highly nonlinear friction of rock-bit interaction. In order to suppress the stick-slip oscillation, a new proportional-derivative controller, which can maintain drill bit’s rotation at a constant speed, is developed. Numerical results are given to demonstrate its efficacy and robustness.
Numerical Application of a Stick-Slip Control and Experimental Analysis using a Test Rig
Authors: Pereira Leonardo D. , Cayres Bruno , Weber Hans I.
Published: February 2018

Part of the process of exploration and development of an oil field consists of the drilling operations for oil and gas wells. Particularly for deep water and ultra deep water wells, the operation requires the control of a very flexible structure which is subjected to complex boundary conditions such as the nonlinear interactions between drill bit and rock formation and between the drill string and borehole wall. Concerning this complexity, the stick-slip phenomenon is a major component related to the torsional vibration and it can excite both axial and lateral vibrations. With these intentions, this paper has the main goal of confronting the torsional vibration problem over a test rig numerical model using a real-time conventional controller. The system contains two discs in which dry friction torques are applied. Therefore, the dynamical behaviour were analysed with and without controlling strategies.
Using EHR Data to Detect Prescribing Errors in Rapidly Discontinued Medication Orders
Authors: Burlison Jonathan , McDaniel Robert , Baker Donald , Hasan Murad , Robertson Jennifer , Howard Scott , Hoffman James
Published: February 2018

Background Previous research developed a new method for locating prescribing errors in rapidly discontinued electronic medication orders. Although effective, the prospective design of that research hinders its feasibility for regular use.

Objectives Our objectives were to assess a method to retrospectively detect prescribing errors, to characterize the identified errors, and to identify potential improvement opportunities.

Methods Electronically submitted medication orders from 28 randomly selected days that were discontinued within 120 minutes of submission were reviewed and categorized as most likely errors, nonerrors, or not enough information to determine status. Identified errors were evaluated by amount of time elapsed from original submission to discontinuation, error type, staff position, and potential clinical significance. Pearson's chi-square test was used to compare rates of errors across prescriber types.

Results In all, 147 errors were identified in 305 medication orders. The method was most effective for orders that were discontinued within 90 minutes. Duplicate orders were most common; physicians in training had the highest error rate (p < 0.001), and 24 errors were potentially clinically significant. None of the errors were voluntarily reported.

Conclusion It is possible to identify prescribing errors in rapidly discontinued medication orders by using retrospective methods that do not require interrupting prescribers to discuss order details. Future research could validate our methods in different clinical settings. Regular use of this measure could help determine the causes of prescribing errors, track performance, and identify and evaluate interventions to improve prescribing systems and processes.
Neurofasziale Integration
Authors: Pfeifer Patrick
Published: February 2018

Lassen sich spezielle Dysfunktionen der Extremitäten oder der Wirbelsäule gezielt als Filtertest nutzen, um dahinter liegende viszerale
Störungen aufzuspüren und effizient zu behandeln? Wie hängen fasziale Restriktionen mit somatoviszeralen Störungen und mit dem autonomen
Nervensystem zusammen? Diese und weitere spannende Fragen beantwortet die Neurofasziale Integration, die Kenntnisse aus Embryologie,
Osteopathie und Faszienforschung vereint.
A case of a rectal stricture related to ischemic proctitis following rupture of an aortic aneurysm
Authors: Iida Tomoya , Ohkubo Yosuke , Kubo Toshiyuki , Yamashita Kentaro , Onodera Kei , Yamamoto Eiichiro , Nosho Katsuhiko , Ito Toshiro , Yamano Hiroo , Nakase Hiroshi
Published: February 2018

Background and study aims Ischemic proctitis is a rare disease and comprises 2 % to 5 % of cases of ischemic colitis, because the rectum has abundant blood supply and rich collaterals. Herein, we report a case of a 73-year-old male patient with a pronounced rectal stricture caused by ischemic proctitis resulting from an abdominal aortic rupture and treated by endoscopic balloon dilation therapy. To date, only 3 cases of rectal stricture related to ischemic proctitis including our case have been reported, and this is the first case of rectal stricture related to ischemic proctitis, which was successfully treated by endoscopic balloon dilation.
Occupational Justice - Recht auf Betätigung
Authors: Kranz Florence
Published: February 2018

Betätigungsgerechtigkeit ist nicht nur ein Konzept. Dahinter steckt die Vision von einer gerechteren Welt. Einer Welt, in der alle Menschen das tun können, was ihnen wirklich wichtig ist: an bedeutsamen Betätigungen teilhaben.
Handschreiben – Die komplexe Welt des Schreibens
Authors: Buthke Fritz
Published: February 2018

In der Grundschule lernen Kinder das Schreiben. Um sicher schreiben zu können, spielen sensomotorische, kognitive und ergonomische Faktoren eine Rolle. Lesen Sie, was Kinder alles leisten müssen und welche Maßnahmen bei Schreibproblemen geeignet sind.
Novel experimental and software methods for image reconstruction and localization in capsule endoscopy
Authors: Koulaouzidis Anastasios , Iakovidis Dimitris , Yung Diana , Mazomenos Evangelos , Bianchi Federico , Karagyris Alexandros , Dimas George , Stoyanov Danail , Thorlacius Henrik , Toth Ervin , Ciuti Gastone
Published: February 2018

Background and study aims Capsule endoscopy (CE) is invaluable for minimally invasive endoscopy of the gastrointestinal tract; however, several technological limitations remain including lack of reliable lesion localization. We present an approach to 3D reconstruction and localization using visual information from 2D CE images.

Patients and methods Colored thumbtacks were secured in rows to the internal wall of a LifeLike bowel model. A PillCam SB3 was calibrated and navigated linearly through the lumen by a high-precision robotic arm. The motion estimation algorithm used data (light falling on the object, fraction of reflected light and surface geometry) from 2D CE images in the video sequence to achieve 3D reconstruction of the bowel model at various frames. The ORB-SLAM technique was used for 3D reconstruction and CE localization within the reconstructed model. This algorithm compared pairs of points between images for reconstruction and localization.

Results As the capsule moved through the model bowel 42 to 66 video frames were obtained per pass. Mean absolute error in the estimated distance travelled by the CE was 4.1 ± 3.9 cm. Our algorithm was able to reconstruct the cylindrical shape of the model bowel with details of the attached thumbtacks. ORB-SLAM successfully reconstructed the bowel wall from simultaneous frames of the CE video. The “track” in the reconstruction corresponded well with the linear forwards-backwards movement of the capsule through the model lumen.

Conclusion The reconstruction methods, detailed above, were able to achieve good quality reconstruction of the bowel model and localization of the capsule trajectory using information from the CE video and images alone.
Überblick über die kongenitale stationäre Nachtblindheit mit überwiegend normalem Fundus
Authors: Zeitz Christina , Friedburg Christoph , Preising Markus , Lorenz Birgit
Published: February 2018

Kongenitale stationäre Nachtblindheit (Englisch: congenital stationary night blindness, CSNB) bezeichnet eine klinisch und genetisch unterscheidbare Gruppe von nicht progressiven Netzhauterkrankungen, die kaum Fundusauffälligkeiten zeigt. Die Vererbung kann autosomal-dominant (adCSNB), autosomal-rezessiv (arCSNB) oder X-chromosomal (XLCSNB) sein. Weitere klinische Merkmale können Myopie, Hyperopie, Strabismus, Nystagmus und reduzierter Visus sein. Mittels Elektroretinografie kann eine Riggs- und eine Schubert-Bornschein-Form unterschieden werden. Während die Riggs-Form eine Fehlfunktion der Stäbchen selbst aufweist, zeigen Patienten mit der weitaus häufigeren Schubert-Bornschein-Form eine Signalübertragungsstörung zwischen den Photorezeptoren und nachgeschalteten Bipolarzellen. Die Schubert-Bornschein-Form der CSNB lässt sich anhand des Elektroretinogramms (ERG) noch weiter in eine inkomplette (Englisch: incomplete, icCSNB) und komplette Form (Englisch: complete, cCSNB) einteilen. Während es sich bei der cCSNB um eine Fehlfunktion des ON-Signalwegs handelt, sind bei der icCSNB sowohl der ON- als auch der OFF-Signalweg und damit meist auch die Sehschärfe betroffen. Mittels klassischer Kopplungsanalyse, Kandidatengenanalyse und seit Neuerem Hochdurchsatzsequenzierung konnten bisher Mutationen in 13 verschiedenen Genen mit dieser Erkrankung assoziiert werden. Durch Studien an Zelllinien oder Tiermodellen konnte gezeigt werden, dass der Phänotyp der Patienten mit der Expression, Proteinlokalisation und Funktion der entsprechenden Moleküle korreliert: Gene, die bei Patienten mit der Riggs-Form der CSNB mutiert sind, haben eine bedeutende Rolle in der Phototransduktionskaskade der Stäbchen. Gene, die bei Patienten mit der icCSNB mutiert sind, kodieren für Proteine, die für die Freisetzung des Neurotransmitters Glutamat am synaptischen Spalt der Photorezeptoren verantwortlich sind. Gene, die bei Patienten mit der cCSNB mutiert sind, kodieren für Proteine, die für die Aufnahme des Glutamats und Weiterleitung des Signals an den ON-Bipolarzellen verantwortlich sind. Erste Therapieversuche im Tiermodell zeigen, dass die CSNB mittels eines gentherapeutischen Ansatzes geheilt werden könnte. Die CSNB betreffende Studien sind einerseits wichtig für eine genaue Diagnose für den Patienten, andererseits helfen sie bei der Entschlüsselung der Moleküle, die für die Signalübertragung zwischen Photorezeptoren und Bipolarzellen eine Rolle spielen, ein bislang wenig erforschtes Gebiet.
Das Lübecker Fähigkeitenprofil (LFP) – In der Psychiatrie standardisiert beobachten
Authors: Höhl Werner
Published: February 2018

Wer Veränderungen bei Patienten in der psychiatrischen Ergotherapie standardisiert erheben möchte, kann sich verschiedener Fremdeinschätzungsinstrumente bedienen. Eine Möglichkeit speziell für die stationäre Therapie von Menschen mit einer Depression ist das Lübecker Fähigkeitenprofil.
A 532 nm fiber-optic displacement interferometer for low-velocity impact experiments
Authors: Jiang Chaoqun , Li Yang , Liu Qiancheng , Zhou Xianming , Luo S. N.
Published: February 2018

Conventional fiber-optic displacement interferometers operated at 1550 nm suffer from low temporal or velocity resolution for lower velocity measurements. To overcome this drawback, a fiber-optic Doppler pin system operated at 532 nm is developed, and its capability is demonstrated with low-velocity plate impact experiments. The new instrument would be an important supplemental to the existed systems.
Configuration optimization of photothermal deflection for measurement sensitivity enhancement
Authors: Zhang Xiaorong , Li Bincheng
Published: February 2018

An accurate theoretical model based on thermoelasticity theory and Fresnel diffraction integral is developed to describe the photothermal deflection (PTD) signal with a continuous-wave modulated Gaussian beam excitation. A PTD experiment is performed to investigate the dependence of PTD amplitude on the experimental parameters, such as the radius, waist position, and wavelength of the probe beam, and the detection distance. Good agreement between the experimental and theoretical results is obtained. The results reveal that the optimal detection distance highly depends on the probe beam waist position and wavelength, and the PTD amplitude can be enhanced by optimizing the probe beam radius and waist position as well as the detection distance. Moreover, it is demonstrated experimentally that the PTD amplitude is inversely proportional to the probe beam wavelength by using three probe lasers with a wavelength of 375 nm, 543 nm, and 632.8 nm. Therefore, the measurement sensitivity of PTD technique could be enhanced by using a short-wavelength probe beam.
Growth dependent magnetization reversal in Co2MnAl full Heusler alloy thin films
Authors: Barwal Vineet , Husain Sajid , Behera Nilamani , Goyat Ekta , Chaudhary Sujeet
Published: February 2018

Angular dependent magnetization reversal has been investigated in Co2MnAl (CMA) full Heusler alloy thin films grown on Si(100) at different growth temperatures (Ts) by DC-magnetron sputtering. An M-shaped curve is observed in the in-plane angular (0°–360°) dependent coercivity (ADC) by magneto-optical Kerr effect measurements. The dependence of the magnetization reversal on Ts is investigated in detail to bring out the structure-property correlation with regards to ADC in these polycrystalline CMA thin films. This magnetization reversal (M-shaped ADC behavior) is well described by the two-phase model, which is a combination of Kondorsky (domain wall motion) and Stoner Wohlfarth (coherent rotation) models. In this model, magnetization reversal starts with depinning of domain walls, with their gradual displacement explained by the Kondorsky model, and at a higher field (when the domain walls merge), the system follows coherent rotation before reaching its saturation following the Stoner Wohlfarth model. Further, the analysis of angular dependent squareness ratio (Mr/Ms) indicates that our films clearly exhibited twofold uniaxial anisotropy, which is related to self-steering effect arising due to the obliquely incident flux during the film-growth.