WorldWideScience

Sample records for chain conveyors

  1. Selección de cadenas para equipos de transporte continuo. // Chain selection software for continuous conveyors.

    Directory of Open Access Journals (Sweden)

    F. Aguilar Parés

    2003-01-01

    ón, transportadores de tablillas, transportadores de rastrillos,elevadores de cangilones._____________________________________________________________________________Abstract:The design of conveyors and elevators that employ chains as driving member is commonly used in industry. An essentialelement for well functioning is the correct chain selection. There are a great variety of chains and attachments thataccomplish any requirements at manufacturers disposal. In order to supply these requirements there is a need to establish aprocedure that considers the following aspects:· Type of equipment (slat conveyor, flight conveyor, bucket conveyor, etc..· Transportation requirements (capacity, transportation velocity, material characteristics, etc..· Transportation conditions (overload, operation conditions, explotation time, etc..The resulting procedure is very annoying because there are stages in which a decision implies accommodation to latecalculations and as usual there is more than one solution. Therefore the SELCAD computation program is conceived for theuse by non experts in design and selection of continuous conveyors equipments. The program use data base from Link BeltIndustrial Chain Division catalog in which 14 types of chains are appraise with an average of 15 models for each and morethan 40 different attachments. Some of the program characteristics are:· User friendly environment (Visual Basic programation, version 5.· Help available at any moment.· Point out the characteristics of both driving member and gear.· Allows visualization of the selected real chain shape and attachment by photos.· Quick analysis of different variations.Key words: Transportation chain, slat conveyors, flight conveyor, bucket conveyor.

  2. 基于输送机链轮的数控铣削加工编程研究%Research on CNC Milling Programming for Conveyor Chain

    Institute of Scientific and Technical Information of China (English)

    李传军

    2012-01-01

    利用配有HNC-22M的XKN715数控铣床,基于宏程序和子程序开发输送机链轮齿形数控加工程序,并给出典型链轮齿形加工数控程序实例.%Using XKN715 CNC milling machine equipped with HNC 22M system, the NC program for conveyor chain was developed based on macro program and subroutines. And a NC programming example for typical conveyor chain tooth profile was given.

  3. Contacts Finite Element Analysis of the Conveyor Chain of Cooling Transporter based on ANSYS%基于ANSYS的冷却运输机输送链接触有限元分析

    Institute of Scientific and Technical Information of China (English)

    马鸿峰

    2011-01-01

    利用Pro/Engineer软件建立了冷却运输机输送链的三维实体模型,然后导入到ANSYS软件中.基于ANSYS软件,采用有限元接触分析方法对冷却运输机滚子输送链进行有限元接触分析,找出了输送链的危险区域和薄弱环节,其结果对冷却运输机输送链的优化设计具有一定的指导意义.%the three-dimensional solid model of the cooling transporter conveyor chain by means of the Pro/Engineer software was built. Then the model af the cooling transporter conveyor chain in Pro/Engineer is changed as finite element model in ANSYS software through the software interface between Pro/ Engineer and ANSYS. Based on the ANSYS software, we used the method of the finite element analysis to analyze the contacts finite element of the cooling transporter conveyor chain, found out the danger section and weaknesses. The results can instruct the optimization design of the cooling transporter conveyor chain.

  4. The optimal design to the chain of pallet conveyors%平板输送机链条的优化设计

    Institute of Scientific and Technical Information of China (English)

    杨志斌

    2013-01-01

    The chain of ordinary pallet conveyor, consisted of roller sleeve chain with K-shaped accessory and steel squared pipe, moves at rolling and sliding between roller and the guide rail when load motion, so the power consumption is comparatively large. In this article was introduced the redesign of the roller structure, the needle roller bearing was equipped in the roller to change supporting motion into simple rolling motion, with the friction loading and main power consumption reduced.%普通平板输送机的链条,由带K型附件的滚子套筒链和方管钢组成,该链条在负载运行时,滚子和链条导轨之间是滚动兼滑动的摩擦运动形式,所消耗的动力功率较大。本文以该问题为切入点,重新设计了滚子结构,在滚子里面加装滚针轴承,使支撑运动形式变为了纯滚动,减小了运动中链条的摩擦负载,降低了主动功耗。

  5. Conveyor performance impacts mine productivity

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2001-11-01

    Factors leading to optimum performance of conveyors and conveyor systems with maximum reliability and least downtime are discussed. These include proper management of drives and take-up, predictive maintenance and condition monitoring and use of outsourcing maintenance. Advance in drive and take-up technologies together with computer software and hardware developments will reduce personnel requirements associated with conveyors. 2 photos.

  6. The Analysis of the Tribological Properties of the Armoured Face Conveyor Chain Race / Badania WŁASNOŚCI Tribologicznych PŁYTY ŚLIZGOWEJ PRZENOŚNIKA ZGRZEBŁOWEGO

    Science.gov (United States)

    Krawczyk, Janusz; Pawłowski, Bogdan

    2013-12-01

    Generally, the power and capacity of the armoured face conveyor (AFC) are determined by the motor size, pan width and chain size. It is well known that the dynamic behaviour of an AFC drive has a significant influence on tension in the AFC chain, and is therefore critical in determining the reliability of the chain and the entire AFC system. However, the chain long service life is also affected by tribological contact with the chain race plate of the AFC and with the coal. The main objective of this work was to determine the tribological properties of AFC twin chain race (top plate). Characterization of the twin chain race, made of the Hardox 450 abrasion resistant steel, included microstructural examination by light microscopy, hardness test, X-ray diffraction and examination of tribological properties. The studies were carried out on samples cut from top plate of the whitdrawn face conveyor twin chain race. It was found, that the Hardox450 steel has quite good wear resistance for such purpose as AFC twin chain race. It is possible to use more wear resistant material than Hardox 450 steel but it would cause premature wear of the AFC chain. Parametry użytkowe górniczego ścianowego przenośnika zgrzebłowego są określane m.in. przez moc silnika, szerokość przenośnika oraz rozmiar łańcucha. Dynamiczne warunki pracy przenośnika zgrzebłowego mają istotny wpływ na wielkość naprężeń w łańcuchu i determinują niezawodność łańcucha i całego przenośnika zgrzebłowego. Na czas bezawaryjnej pracy łańcucha ma również wpływ szereg innych czynników, w tym zużycie tribologiczne ogniw łańcucha wskutek kontaktu ciernego z dnem rynny przenośnika oraz transportowanym urobkiem. Głównym celem pracy było określenie własności tribologicznych rynny przenośnika zgrzebłowego wykonanej z odpornej na ścieranie stali Hardox 450. Wykonano badania metalograficzne, pomiary twardości, badania rentgenowskie oraz próby tribologiczne. Stwierdzono,

  7. Development of a high capacity longwall conveyor. Final technical report

    Energy Technology Data Exchange (ETDEWEB)

    Sparks, C

    1982-05-01

    The objectives of this program were to develop, fabricate, and demonstrate a longwall conveying system capable of transporting coal at a rate of 9000 tons/day (1000 tons/hr) and capable of accommodating a surge rate of 20 tons/min. The equipment was required to have the structural durability to perform with an operating availability of 90%. A review of available literature and discussions with longwall operators identified the problem areas of conveyor design that required attention. The conveyor under this contract was designed and fabricated with special attention given to these areas, and also to be easily maintainable. The design utilized twin 300 hp drives and twin inboard 26-mm chain at 270 ft/min; predictions of capacity and reliability based on the design indicating that it would satisfy the program requirements. Conveyor components were critically tested and the complete conveyor was surface-tested, the results verifying the design specifications. In addition, an instrumentation system was developed with analysis by computer techniques to monitor the performance of the conveyor. The conveyor was installed at a selected mine site, and it was the intention to monitor its performance over the entire longwall panel. Monitoring of the conveyor performance was conducted over approximately one-third of the longwall panel, at which point further effort was suspended. However, during the monitored period, data collected from various sources showed the conveyor to have exhibited its capability of transporting coal at the desired rate, and also to have conformed to the program requirements of reliability and availability.

  8. Current conveyors variants, applications and hardware implementations

    CERN Document Server

    Senani, Raj; Singh, A K

    2015-01-01

    This book serves as a single-source reference to Current Conveyors and their use in modern Analog Circuit Design. The authors describe the various types of current conveyors discovered over the past 45 years, details of all currently available, off-the-shelf integrated circuit current conveyors, and implementations of current conveyors using other, off-the-shelf IC building blocks. Coverage includes prominent bipolar/CMOS/Bi-CMOS architectures of current conveyors, as well as all varieties of starting from third generation current conveyors to universal current conveyors, their implementations and applications. •Describes all commercially available off-the-shelf IC current conveyors, as well as hardware implementations of current conveyors using other off-the-shelf ICs; • Describes numerous variants of current conveyors evolved over the past forty five years; • Describes a number of Bipolar/CMOS/Bi-CMOS architectures of current conveyors, along with their characteristic features; • Includes a comprehe...

  9. 油菜割晒机拨指输送链式输送装置研制与试验%Development and experiment of rape windrower transportation device with poke finger conveyor chain

    Institute of Scientific and Technical Information of China (English)

    金诚谦; 尹文庆; 吴崇友

    2013-01-01

    The rape plant area is the largest in oil-bearing crops in China, and accounts for a quarter of the total rape plant population in the world. However, the uneven maturity of this rape limits the development of rape harvest mechanization. Rape partition harvest technology is composed of windrowing technology and collecting threshing technology. The rape plant is cut in the first stage, maturity. Maturity consistency and plant type are not important in the rape windrowing operation. It has the advantage of strong adaptability and a long harvest time. So rape partition harvest technology has an extensive market foreground and utility value. Windrowing technology is a difficulty in rape partition harvest technology. How to solve the problems of windrowing and transportation are the main and most difficult points in the process of designing a windrower. Focusing on the problem of windrowing and transporting in rape windrowing, a rape windrower with a vertical cutter, level cutter, machine frame, poke finger conveyor chain, driveline component, interface component, and reel device was designed. This machine was hitched with a combine chassis with functions of cutting, transporting, and windrowing. A transportation device was composed of 4 strips on a rotation poke finger conveyor chain;the poke finger conveyor chain was installed in chains. The poke finger was articulated on the chain, so it could stick out and retract while controlled by a guide in locked position. Rape plant on the transportation device was transported to an outlet by the exsertion poke finger, It was windrowed in the field when the poke finger was retracted in the outlet. The requirements of the outlet structure design were given in this paper. Based on analysis of the action process of reel and rape plants, parameters of expression of level and vertical distance between reel and cutter were established, and correlation between the installation angle of the transportation part and push angle of the

  10. Current Conveyor Equivalent Circuits

    Directory of Open Access Journals (Sweden)

    Tejmal S. Rathore

    2012-02-01

    Full Text Available An equivalence between a class of (current conveyor CC II+ and CC II- circuits is established. CC IIequivalent circuit uses one extra element. However, under certain condition, the extra element can be eliminated. As an illustration of the application of this equivalence, minimal first and second order all-pass filters are derived. Incertain cases, it is possible to compensate the effect of the input resistor of CC at port X. At the end, an open problem of realizing an Nth order (N > 2 minimal all-pass filter is stated.

  11. A Chaos Conveyor Belt

    Science.gov (United States)

    Schmidt, Britney E.

    2013-10-01

    ocean in light of active processes that may form a “chaos conveyor belt” that drives material exchange on Europa.

  12. 链条输送式变量施肥抛撒机的设计与试验%Design and experiment of variable rate fertilizer spreader with conveyor chain

    Institute of Scientific and Technical Information of China (English)

    张睿; 王秀; 赵春江; 白由路; 孟志军; 陈立平

    2012-01-01

    针对国内变量施肥机作业幅宽小,变量施肥抛撒机缺乏的问题,该文应用变量施肥技术,设计了一种基于处方图的链条输送式变量施肥抛撒机.通过分析肥料颗粒在撒肥盘上的运动和受力,建立了肥料颗粒在脱离撒肥机圆盘过程中的运动方程,设计并确定了变量抛撒控制系统、肥箱、肥门自动开启装置等关键部件的结构及参数.并进行了不同施肥量和抛撒均匀性的试验,结果表明:链条输送式变量施肥抛撒机变量效果较好,且具有较好的抛撒均匀性,在拖拉机速度1.5 m/s,实际施肥量与预置施肥量相对误差最大值为7.53%;拖拉机速度2m/s,目标施肥量225 kg/hm2,抛撒幅宽设定30m,有效幅宽抛撒变异系数为14.90%,能够较好的满足实际生产要求.%To solve the problem of lacking suitable variable rate fertilizer spreader in China, a variable rate fertilizer spreader with conveyor chain based on prescription map was designed. A motional equation of fertilizer granular at the moment of thrown from disc border was established through analyzing force and motion of fertilizer granular at spreader disc, and then the system of key components was designed and the corresponding machinery parameters were confirmed, such as variable rate control system, fertilizer box, the auto-opening device of gate etc. The experiments on different fertilizer amount and uniformity were conducted with a variable rate fertilizer spreader. Results showed that the spreader's effect of variable rate fertilization and uniformity of the spreader was better. When the speed of tractor was 1.5 m/s, relative error between actual application amount and pre-setting amount was less than 7.53%. When the speed of tractor was 2 m/s, the coefficient of variance was 14.90%, fertilization amount was 225 kg/hm2 and the spreader breadth was 30 m, which indicates the spreader can meet the need of practical production.

  13. Dynamic characteristics of conveyor belts

    Institute of Scientific and Technical Information of China (English)

    HOU You-fu; MENG Qing-rui

    2008-01-01

    The dynamic characteristics of a belt conveyor are determined to a large extent by the properties of the belt. This paper describes experiments designed to establish the dynamic properties of belting material. The dynamic elastic modulus, viscous damping and theological constants of the belt were measured. Several properties were studied as a function of the tensile loading on the belt. These included longitudinal vibration, the natural vibration frequency in the transverse direction and the response to an impulse excitation. Vibration response was observed under several different excitation frequencies. Most of these properties have not been tested previously under conditions appropriate for the ISO/DP9856 standard. Two types of belt were tested, a steel reinforced belt and a fabric reinforced belt. The test equipment was built to provide data appropriate for designing belt conveyors. It was observed that the stress wave propagation speed increased with tensile load and that tensile load was the main factor influencing longitudinal vibrations.

  14. Chaos on the conveyor belt

    CERN Document Server

    Sándor, Bulcsú; Tél, Tamás; Néda, Zoltán

    2013-01-01

    The dynamics of a spring-block train placed on a moving conveyor belt is investigated both by simple experiments and computer simulations. The first block is connected by spring to an external static point, and due to the dragging effect of the belt the blocks undergo complex stick-slip dynamics. A qualitative agreement with the experimental results can only be achieved by taking into account the spatial inhomogeneity of the friction force on the belt's surface, modeled as noise. As a function of the velocity of the conveyor belt and the noise strength, the system exhibits complex, self-organized critical, sometimes chaotic dynamics and phase transition-like behavior. Noise induced chaos and intermittency is also observed. Simulations suggest that the maximum complexity of the dynamical states is achieved for a relatively small number of blocks, around five.

  15. Computer-aided design of conveyor belts

    Energy Technology Data Exchange (ETDEWEB)

    Karolewski, B.; Pytel, J.

    1984-01-01

    Possibilities are discussed for using mathematical models of belt conveyors for development of computer-aided design of conveyors for coal mining. Examples of optimization tasks and methods for their solution using computerized simulation are analyzed. The analysis is illustrated by an algorithm used to design a starter for the drive system of a belt conveyor. Electromagnetic moment and starting current are used as optimization criteria. A simplified model of a belt conveyor is used. The model consists of an equation of motion with variable braking moment and variable moment of inertia. 3 references.

  16. Intelligent Belt Conveyor Monitoring and Control

    NARCIS (Netherlands)

    Pang, Y.

    2010-01-01

    Belt conveyors have been used worldwide in continuous material transport for about 250 years. Traditional inspection and monitoring of large-scale belt conveyors focus on individual critical components and response to catastrophic system failures. To prevent operational problems caused by the lack o

  17. Noise Properties of CMOS Current Conveyors

    DEFF Research Database (Denmark)

    Bruun, Erik

    1996-01-01

    model for the current conveyor is established. This model is used for the analysis of selected examples of current conveyor based operational amplifier configurations and the relative merits with respect to the noise performance of these configurations are discussed. Finally, the noise model...

  18. EVALUATION OF SOME PRODUCTION CHARACTERISTICS OF RECURSIVE CONVEYOR

    Directory of Open Access Journals (Sweden)

    Boris V. Kupriyanov

    2016-01-01

    Full Text Available We consider the two objectives of direct relevance to operational planning based on the model of recursive conveyor process. Calculate the Critical Operation of the conveyor and calculate the Load Factor of the equipment of the conveyor

  19. Development of belt conveyor driving system

    Institute of Scientific and Technical Information of China (English)

    FU Jun-qing(付峻青); WANG Cong(王聪); HUO Wei(霍伟)

    2004-01-01

    A short review for the existing various driving methods for belt conveyor was given, which include the analysis and comparison about the advantages, disadvantages and suitable application range of these methods. Based on this the variable-frequency-control(VFC) method for belt conveyor drive was fully discussed with focus on its application in medium-high voltage range. The principle of Neutral Point Clamped (NPC) Three-Level Inverter using high-voltage IGBTs together with the control strategy of rotor field-oriented vector control for induction motor drive were illustrated.

  20. Communication equipment for underground conveyor units

    Energy Technology Data Exchange (ETDEWEB)

    Geurts, J.

    1981-06-01

    There are many factors governing smooth operation of a conveyor system. Communication systems are required for fast access to information in case of disturbances. The following possibilities are reported: Use of the existing telecommunication network, use of radio equipment, use of an independent intercommunication system.

  1. Floating RC Networks Using Current Conveyors

    Directory of Open Access Journals (Sweden)

    V. Zeman

    1996-06-01

    Full Text Available The paper deals with the design of floating one- and/or two-port high-order networks. The current conveyor CCII+ seems to be a suitable active building block for this purpose. Some examples of the above mentioned networks are shown .

  2. Design aspects of multiple driven belt conveyors

    NARCIS (Netherlands)

    Nuttall, A.J.G.

    2007-01-01

    Worldwide belt conveyors are used to transport a great variety of bulk solid materials. The desire to carry higher tonnages over longer distances and more diverse routes, while keeping exploitation costs as low as possible, has fuelled many technological advances. An interesting development in the r

  3. Underground fires involving conveyor systems, 1958-78

    Energy Technology Data Exchange (ETDEWEB)

    Cutler, D.P.; Currie, J.L.

    1979-12-01

    Discusses the emergence of fire resistant conveyor belts for use in British mines, following the fires at Creswell and Whitfield Collieries, and the development of fire tests. The principle tests for belting are described and their relevance to the real fire situation is shown. The role of the conveyor as a cause of fire, and the effects of fire on conveyors, are identified from the fire statistics for the past 21 years.

  4. Resistance and other parameters of belt conveyor shifting

    Energy Technology Data Exchange (ETDEWEB)

    Dembinski, M.

    1988-07-01

    Discusses a method developed by Poltegor for calculating energy consumption of belt conveyor shifting in brown coal surface mines in Poland. A program for simulating effects of all significant factors that represent the environment, physical and mechanical properties of soil, effects of weather and atmospheric precipitations, design of belt conveyors, effects of soil or coal buildup and conveyor wear is used. Indices that describe effects of major groups of factors are used for calculating resistance to belt conveyor shifting considering local conditions. Investigations carried out in the Belchatow brown coal mine show the method to be accurate and reliable.

  5. Universal Voltage Conveyor and Current Conveyor in Fast Full-Wave Rectifier

    Directory of Open Access Journals (Sweden)

    Josef Burian

    2012-12-01

    Full Text Available This paper deals about the design of a fast voltage-mode full-wave rectifier, where universal voltage conveyor and second-generation current conveyor are used as active elements. Thanks to the active elements, the input and output impedance of the non-linear circuit is infinitely high respectively zero in theory. For the rectification only two diodes and three resistors are required as passive elements. The performance of the circuit is shown on experimental measurement results showing the dynamic range, time response, frequency dependent DC transient value and RMS error for different values of input voltage amplitudes.

  6. Emulation of floating memcapacitors and meminductors using current conveyors

    CERN Document Server

    Pershin, Yuriy V

    2010-01-01

    We suggest circuit realizations of emulators transforming memristive devices into effective floating memcapacitive and meminductive systems. The emulator's circuits are based on second generation current conveyors and involve either four single-output or two dual-output current conveyors. The equations governing the resulting memcapactive and meminductive systems are presented.

  7. Behind KPC's 13 km conveyor

    Energy Technology Data Exchange (ETDEWEB)

    James, G. (Minenco Pty. Ltd., Brisbane, Qld. (Australia))

    1993-11-01

    Describes the Kaltim Prima Coal overland conveyor. The conveyor is 13.1 km long and runs from the mine to a 700,000 port stockpile. Aspects covered include design and construction, instrumentation, equipment selection and discharge chutework. 1 fig., 1 photo.

  8. 30 CFR 56.14202 - Manual cleaning of conveyor pulleys.

    Science.gov (United States)

    2010-07-01

    ... 30 Mineral Resources 1 2010-07-01 2010-07-01 false Manual cleaning of conveyor pulleys. 56.14202 Section 56.14202 Mineral Resources MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR METAL AND... Equipment Safety Practices and Operational Procedures § 56.14202 Manual cleaning of conveyor...

  9. Analysis of the Noise Characteristics of CMOS Current Conveyors

    DEFF Research Database (Denmark)

    Bruun, Erik

    1997-01-01

    is described. This model is used for the analysis of selected examples of current conveyor based operational amplifier configurations and the noise performance of these configurations is compared. Finally, the noise model is developed for a CMOS current conveyor implementation, and approaches...

  10. Reducing The Risk Of Fires In Conveyor Transport

    Science.gov (United States)

    Cheremushkina, M. S.; Poddubniy, D. A.

    2017-01-01

    The paper deals with the actual problem of increasing the safety of operation of belt conveyors in mines. Was developed the control algorithm that meets the technical requirements of the mine belt conveyors, reduces the risk of fires of conveyors belt, and enables energy and resource savings taking into account random sort of traffic. The most effective method of decision such tasks is the construction of control systems with the use of variable speed drives for asynchronous motors. Was designed the mathematical model of the system "variable speed multiengine drive - conveyor - control system of conveyors", that takes into account the dynamic processes occurring in the elements of the transport system, provides an assessment of the energy efficiency of application the developed algorithms, which allows to reduce the dynamic overload in the belt to (15-20)%.

  11. Heads for shifting new generation of belt conveyors

    Energy Technology Data Exchange (ETDEWEB)

    Dembinski, M.

    1980-03-01

    New design of belt conveyors characterized by rigid section joints and conveyor to pontoon joints significantly influences loading of machines shifting belt conveyors to new locations. A new belt conveyor shifting machine head design, called SGP12 (selflocking head for vertical loads up to 120 kN) is described. Design is shown in 4 diagrams. It is stressed that in the SGP-12 the force clamping rollers on rails is automatically controlled depending on the height to which the rails are lifted. Clamping force is proportional to the height. This means of controlling the clamping force excludes damage to the head and reduces wear of the rollers. The SGP12 is, therefore, superior to the GP-12 shifting head of similar capacity. It is suggested that the SGP-12 is characterized by simple design, easier operation, higher reliability and greater safety. The SGP-12 can be used to shift belt conveyors with belts 2250 mm to 3000 mm wide.

  12. Linear Motor for Drive of Belt Conveyor

    Directory of Open Access Journals (Sweden)

    Milan Krasl

    2006-01-01

    Full Text Available This paper introduces a novel approach on the design of a linear motor for drive of belt conveyor (LMBC. The motor is a simple combination of asynchronous motor in plane. The electromagnetic forces is one of the most important parameters of electrical machines. This parameter is necessary for the checking of the design. This paper describes several variants: linear motor with slots in platens, slots in one half of platens and optimization of slots. The electromagnetic force can be found with the help of a Finite Elements Method – based program. For solution was used QuickField program.

  13. CALCULATION OF TENSION FORCE OF BELT CONVEYOR

    Directory of Open Access Journals (Sweden)

    Ismet Ibishi

    2012-12-01

    Full Text Available In this paper is done the explanation on tension fashion of the belt conveyor which is employed in Kosovo Energy Corporation – KEK, for coal transportation to provide electric power plant. The aim of the paper enables to recognize tension forces not to pass with deformation of belt so that this problem will damage the workingprocess. Work principle is based on initial tension and tension during working process. The fact is known that the tension starts from the carriage on the way to tension mechanization, so forces on the rope passing through pulley there has to dominate the friction coefficient. All this process is related to economy of transportationmechanism.

  14. Trial Application of Pulse-Field Magnetization to Magnetically Levitated Conveyor System

    Directory of Open Access Journals (Sweden)

    Yoshihito Miyatake

    2012-01-01

    Full Text Available Magnetically levitated conveyor system using superconductors is discussed. The system is composed of a levitated conveyor, magnetic rails, a linear induction motor, and some power supplies. In the paper, pulse-field magnetization is applied to the system. Then, the levitation height and the dynamics of the conveyor are controlled. The static and dynamic characteristics of the levitated conveyor are discussed.

  15. Centrifuging Step-Screw Conveyor for Regolith Project

    Data.gov (United States)

    National Aeronautics and Space Administration — A variety of ISRU operations will utilize lunar regolith as feedstock. The proposed centrifuging step-screw conveyor concept will provide a well controlled robust,...

  16. RECURSIVE CONVEYOR PROCESSES - THE MAIN PROPERTIES AND CHARACTERISTICS

    Directory of Open Access Journals (Sweden)

    Boris V. Kupriyanov

    2015-01-01

    Full Text Available In the article the formal model of recursive conveyor processes is considered. The main properties and characteristics ofthis type of processes are described andillustrated. Based on these properties splitting processes into classes is carried out.

  17. A Review of Screw Conveyors Performance Evaluation During Handling Process

    Directory of Open Access Journals (Sweden)

    Hemad Zareiforoush

    2010-04-01

    Full Text Available This paper reviews recent work on screw conveyors performance evaluation during handling process, especially in the case of agricultural grains and bulk materials. Experimental work has been mainly carried out to determine a range of parameters, such as auger dimension, screw rotational speed, screw clearance, conveyor intake length and conveying angle for horizontal, inclined and vertical screw conveyors. Several measurement techniques including theoretical models and DEM have been utilized to study the screw conveyors performance. However, each of these techniques is limited in its application. Difficulties in representing vortex motion and interactions among conveying grains and between the particles and screw rotating flight have so far limited the success of advanced modeling. Further work is needed to be conducted on screw augers performance to understand and improve the agricultural grains and bulk materials handling process.

  18. Floating Inductance and FDNR Using Positive Polarity Current Conveyors

    Directory of Open Access Journals (Sweden)

    K. Pal

    2004-01-01

    Full Text Available A generalized circuit based on five positive polarity second-generation current conveyors is introduced. The circuit simulates a floating inductance, capacitor floatation circuit and floating fdnr. All these circuits use grounded capacitors.

  19. LOAD DISTRIBUTION ON DRUMS OF DOUBLE DRIVE BELT CONVEYOR

    Institute of Scientific and Technical Information of China (English)

    薛河; 苏清祖; 马胜利

    1999-01-01

    The double drum drive is widely used on the mine belt conveyor, which are divided the rigid connected double drums and separately driving double drums according to connected method of two drums. Because of the change of real work condition, the load distribution is changed on the two drive drums, which may produce a slippage between a drum and belt. Slippage may intensify the wear of the drum, and sometimes causing the fire of the belt. This restricts the development toward narrow belt, high velocity and large power of belt conveyor. In this paper, the factors affecting the load distribution of two drums of double drum belt conveyor are'systematically analyzed and some computing formulas derived, by these formulas, the actual load distribution onthe two drums of rigid connected or separately driving belt conveyor can be separately calculated. These formulas also can be as the theory base for adjusting the driving force of two drums.

  20. Research on Dynamic Tension for Belt Conveyor with Constant Force Automatic Take-Up Assembly

    Institute of Scientific and Technical Information of China (English)

    MENG Guo-ying; CHEN Jing-li; LI Yu-jin

    2003-01-01

    The article Provides a dynamic model for belt conveyor. Based on the drive-force of conveyor, take-up tension of take-up assembly, gravity of conveyor belt and material, and friction between belt and idlers, it gives a viscoelastic dynamic equation for conveyor belt. It presents a calculation method of analytic solution to both viscoelastic dynamic equation and geometric dynamic equation when automatic take-up assembly is applied to belt conveyor. The article also makes a study of design method of limiting and eliminating the conveyor belt's elastic vibration.

  1. Discrete element modelling of screw conveyor-mixers

    Directory of Open Access Journals (Sweden)

    Jovanović Aca

    2015-01-01

    Full Text Available Screw conveyors are used extensively in food, plastics, mineral processing, agriculture and processing industries for elevating and/or transporting bulk materials over short to medium distances. Despite their apparent simplicity in design, the transportation action is very complex for design and constructors have tended to rely heavily on empirical performance data. Screw conveyor performance is affected by its operating conditions (such as: the rotational speed of the screw, the inclination of the screw conveyor, and its volumetric fill level. In this paper, horizontal, several single-pitch screw conveyors with some geometry variations in screw blade was investigated for mixing action during transport, using Discrete Element Method (DEM. The influence of geometry modifications on the performance of screw conveyor was examined, different screw designs were compared, and the effects of geometrical variations on mixing performances during transport were explored. During the transport, the particle tumbles down from the top of the helix to the next free surface and that segment of the path was used for auxiliary mixing action. The particle path is dramatically increased with the addition of three complementary helices oriented in the same direction as screw blades (1458.2 mm compared to 397.6 mm in case of single flight screw conveyor Transport route enlarges to 1764.4 mm, when installing helices oriented in the opposite direction from screw blades. By addition of straight line blade to single flight screw conveyor, the longest particle path is being reached: 2061.6 mm [Projekat Ministarstva nauke Republike Srbije, br. TR-31055

  2. Transparent Conveyor of Dielectric Liquids or Particles

    Science.gov (United States)

    Calle, Carlos I.; Mantovani, James G.

    2009-01-01

    The concept of a transparent conveyor of small loose dielectric parti cles or small amounts of dielectric liquids has emerged as an outgro wth of an effort to develop efficient, reliable means of automated re moval of dust from solar cells and from windows of optical instrumen ts. This concept is based on the previously reported concept of an e lectrodynamic screen, according to which a grid-like electric field is established on and near a surface and is moved along the surface p erpendicularly to the grid lines. The resulting electrodynamic force s on loose dielectric particles or dielectric liquid drops in the vic inity would move the particles or drops along the surface. In the or iginal dust-removal application, dust particles would thus be swept out of the affected window area. Other potential applications may occ ur in nanotechnology -- for example, involving mixing of two or more fluids and/or nanoscale particles under optical illumination and/or optical observation.

  3. 7 CFR 58.228 - Dump hoppers, screens, mixers and conveyors.

    Science.gov (United States)

    2010-01-01

    ... 7 Agriculture 3 2010-01-01 2010-01-01 false Dump hoppers, screens, mixers and conveyors. 58.228... Service 1 Equipment and Utensils § 58.228 Dump hoppers, screens, mixers and conveyors. The product contact surfaces of dump hoppers, screens, mixers and conveyors which are used in the process of transferring...

  4. On possible flow back in vertical screw conveyors for cohesionless granular materials

    NARCIS (Netherlands)

    Rademacher, F.J.C.

    1981-01-01

    Conditions for which back flow will be initiated in vertical screw conveyors conveying cohesionless granular material are theoretically established. Use is made of existing knowledge of the performance characteristics of such conveyors. Provided the conveyor is operated at not too low an angular spe

  5. On Dynamic Range Limitations of CMOS Current Conveyors

    DEFF Research Database (Denmark)

    Bruun, Erik

    1999-01-01

    This paper is concerned with the dynamic range of continuous time CMOS current mode circuits. As a representative current mode device a class AB current conveyor is examined. First, the voltage input range of the high impedance Y input is investigated. Next, the current input range of the low...... impedance X input is investigated. It is compared to the thermal noise in the X to Z signal path in order to evaluate the dynamic range, and the dependencies of the dynamic range on the supply voltage and the transistor lay-out is derived, both for the situation where the conveyor is used over a narrow...... frequency band and for the situation where the conveyor is used over the full bandwidth achievable. Finally, the optimisation of the current input range is related to the distortion characteristics and it is pointed out that to a first order approximation the distortion is independent of the current range....

  6. RATIONALE FOR CENTERING CAPACITY OF REDISIGNED BELT CONVEYOR DRUMS

    Directory of Open Access Journals (Sweden)

    V. V. Suglobov

    2016-02-01

    Full Text Available Purpose. In the study is necessary: 1 to justify aligning drums of a new design of belt conveyors; 2 to develop a method for calculating and determining the rational design parameters of drums depending on the technical parameters of the conveyor belt (the length of the conveyor, belt width, the performance of the conveyor, the diameter of the drive and tension drums, etc.; 3 to carry out pilot studies of efficiency conveyor belt in a production environment in order to determine the magnitude of dynamic loads and a comparative evaluation of the effectiveness of the centering ability of conventional and new designs of drums. Methodology. To substantiate the effectiveness of the centering ability of the drums of a new design by the authors developed a mathematical model of interaction of the tape with the drum. Mathematical simulation of tape reels with new design comes to drawing up a differential equation of the belt based on the dynamic component and restoring force. This model allowed us to estimate the movement of the tape in the transverse direction based on the calculated additional dynamic loads and forces on the investigated centering a conveyor belt with given specifications. For the first time the technique of calculating and determining the rational parameters of the drums, which allows determining the design parameters of the centering portions, depending on the mechanical properties and geometric parameters of the tape. Findings. With the help of mathematical modeling the scientifically substantiated effect of centering the ability of the new design of the drum, which ensures stable tape running along the longitudinal axis of the conveyor. The authors made the following conclusions: 1 the mathematical model of interaction with the new belt design of the drum, which allowed to describe the belt in the transverse direction in view of additional dynamic loads and renewable power was developed; 2 the method of calculation and

  7. DEVELOPMENT OF THE TEST METHODS OF THE CONVEYOR BELTS USED IN ENVIRONMENTS ENDANGERED BY EXPLOSION HAZARDS

    Directory of Open Access Journals (Sweden)

    Florin Adrian PĂUN

    2012-05-01

    Full Text Available Conveyor belts are used for a long period of time in the industry branches where potentially explosive atmospheres could occur. Dangerous phenomena which can be in direct connection with the use of conveyor belts are the ones regarding: - sparks influence over the coating layer and/or resistance internal structure of the stopped conveyor belt; - propagation of a flame along the length of a conveyor belt that was exposed to a energy source relative high like a fire or due to blockage of a conveyor belt as a result of the driving mechanism still operating, that generate a local heating of the conveyor belt in contact with the driving drum, rollers or any other heating source generated by friction. Determining the safety parameters characteristic of the conveyor belts by employing test methods allows assessment of the safety level as well as certification of their explosion protection quality when used in environments with explosion danger.

  8. Piezoelectric Driving of Vibration Conveyors: An Experimental Assessment

    Science.gov (United States)

    Rade, Domingos Alves; de Albuquerque, Emerson Bastos; Figueira, Leandro Chaves; Carvalho, João Carlos Mendes

    2013-01-01

    Vibratory feeders or vibratory conveyors have been widely used for the transport and orientation of individual parts and bulk materials in many branches of industrial activity. From the designer's standpoint, the current endeavor is to conceive efficient vibratory feeders, satisfying constraints of power consumption, vibration transmission and noise emission. Moreover, the interest in the reduction of maintenance cost is always present. In this context, this paper investigates experimentally the concept of vibratory conveying based on the use of piezoelectric materials for motion generation. A small-size prototype of a linear conveyor, in which lead-zirconate-titanate (PZT) patches are bonded to the resilient elements, is described. One of the main design goals is that the prototype is intended to be fed directly from the electric network, aiming at avoiding the use of electronic equipment for driving. To comply with this feature and, at the same time, enable to adjust the transport velocity, a mechanical device has been conceived in such a way that the first natural frequency of the conveyor can be changed. It is shown that the transport velocity is determined by the proximity between the excitation frequency and the first natural frequency of the conveyor. The experimental tests performed to characterize the dynamic behavior of the prototype are described and the range of transport velocities is determined. PMID:23867743

  9. Effective Conveyor Belt Inspection for Improved Mining Productivity

    Energy Technology Data Exchange (ETDEWEB)

    Chris Fromme

    2006-06-01

    This document details progress on the project entitled ''Effective Conveyor Belt Inspection for Improved Mining Productivity'' during the period from November 15, 2004 to May 14, 2004. Highlights include fabrication of an improved LED lightbar, fabrication of a line-scan sensor head for the Smart-Camera based prototype, and development of prototype vulcanized splice detection algorithms.

  10. 30 CFR 57.14202 - Manual cleaning of conveyor pulleys.

    Science.gov (United States)

    2010-07-01

    ... 30 Mineral Resources 1 2010-07-01 2010-07-01 false Manual cleaning of conveyor pulleys. 57.14202 Section 57.14202 Mineral Resources MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR METAL AND... and Equipment Safety Practices and Operational Procedures § 57.14202 Manual cleaning of...

  11. Flexible Mechanical Conveyors for Regolith Extraction and Transport

    Science.gov (United States)

    Walton, Otis R.; Vollmer, Hubert J.

    2013-01-01

    A report describes flexible mechanical conveying systems for transporting fine cohesive regolith under microgravity and vacuum conditions. They are totally enclosed, virtually dust-free, and can include enough flexibility in the conveying path to enable an expanded range of extraction and transport scenarios, including nonlinear drill-holes and excavation of enlarged subsurface openings without large entry holes. The design of the conveyors is a modification of conventional screw conveyors such that the central screw-shaft and the outer housing or conveyingtube have a degree of bending flexibility, allowing the conveyors to become nonlinear conveying systems that can convey around gentle bends. The central flexible shaft is similar to those used in common tools like a weed whacker, consisting of multiple layers of tightly wound wires around a central wire core. Utilization of compliant components (screw blade or outer wall) increases the robustness of the conveying, allowing an occasional oversized particle to pass hough the conveyor without causing a jam or stoppage

  12. Piezoelectric driving of vibration conveyors: an experimental assessment.

    Science.gov (United States)

    Rade, Domingos Alves; de Albuquerque, Emerson Bastos; Figueira, Leandro Chaves; Carvalho, João Carlos Mendes

    2013-07-17

    Vibratory feeders or vibratory conveyors have been widely used for the transport and orientation of individual parts and bulk materials in many branches of industrial activity. From the designer's standpoint, the current endeavor is to conceive efficient vibratory feeders, satisfying constraints of power consumption, vibration transmission and noise emission. Moreover, the interest in the reduction of maintenance cost is always present. In this context, this paper investigates experimentally the concept of vibratory conveying based on the use of piezoelectric materials for motion generation. A small-size prototype of a linear conveyor, in which lead-zirconate-titanate (PZT) patches are bonded to the resilient elements, is described. One of the main design goals is that the prototype is intended to be fed directly from the electric network, aiming at avoiding the use of electronic equipment for driving. To comply with this feature and, at the same time, enable to adjust the transport velocity, a mechanical device has been conceived in such a way that the first natural frequency of the conveyor can be changed. It is shown that the transport velocity is determined by the proximity between the excitation frequency and the first natural frequency of the conveyor. The experimental tests performed to characterize the dynamic behavior of the prototype are described and the range of transport velocities is determined.

  13. Piezoelectric Driving of Vibration Conveyors: An Experimental Assessment

    Directory of Open Access Journals (Sweden)

    Emerson Bastos de Albuquerque

    2013-07-01

    Full Text Available Vibratory feeders or vibratory conveyors have been widely used for the transport and orientation of individual parts and bulk materials in many branches of industrial activity. From the designer’s standpoint, the current endeavor is to conceive efficient vibratory feeders, satisfying constraints of power consumption, vibration transmission and noise emission. Moreover, the interest in the reduction of maintenance cost is always present. In this context, this paper investigates experimentally the concept of vibratory conveying based on the use of piezoelectric materials for motion generation. A small-size prototype of a linear conveyor, in which lead-zirconate-titanate (PZT patches are bonded to the resilient elements, is described. One of the main design goals is that the prototype is intended to be fed directly from the electric network, aiming at avoiding the use of electronic equipment for driving. To comply with this feature and, at the same time, enable to adjust the transport velocity, a mechanical device has been conceived in such a way that the first natural frequency of the conveyor can be changed. It is shown that the transport velocity is determined by the proximity between the excitation frequency and the first natural frequency of the conveyor. The experimental tests performed to characterize the dynamic behavior of the prototype are described and the range of transport velocities is determined.

  14. Modeling and simulation of longwall scraper conveyor considering operational faults

    Science.gov (United States)

    Cenacewicz, Krzysztof; Katunin, Andrzej

    2016-06-01

    The paper provides a description of analytical model of a longwall scraper conveyor, including its electrical, mechanical, measurement and control actuating systems, as well as presentation of its implementation in the form of computer simulator in the Matlab®/Simulink® environment. Using this simulator eight scenarios typical of usual operational conditions of an underground scraper conveyor can be generated. Moreover, the simulator provides a possibility of modeling various operational faults and taking into consideration a measurement noise generated by transducers. The analysis of various combinations of scenarios of operation and faults with description is presented. The simulator developed may find potential application in benchmarking of diagnostic systems, testing of algorithms of operational control or can be used for supporting the modeling of real processes occurring in similar systems.

  15. Conveyorized Radio Frequency Cure of Epoxy Glass Composites.

    Science.gov (United States)

    1980-05-01

    322 ,ounds on Conveyor the rax. speed is_______:i. VJ. Vin speed cf conveyor !) elt is eaival to or lIess t .A .. es Min. speed 0.11 ft/min. wit *o...1.000 1128 5581 5.16 53 (lCT) 259,520 .090 1.004 938 4503 1 5.19 59 ( ICT ) 235,270 .086 1.006 778 3928 5.18 69 OCT) 240.010 .091 1.003 RRr 4 _ _ a 72...R. Bushelman M-29 0. Browning 7 I b’ubo".. • -a " o , -T - No. I Secio of Costn ThicknessPanel iCT a No. 1 Section of Constant Thickness Panel M

  16. Alligator gets its teeth into the conveyor market

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1996-08-01

    Founded in 1907 in Chicago, USA, the Flexible Steel Lacing Company grew from a manufacturer of mechanical conveyor belt fasteners to become an international leader in the manufacture of belt fasteners and related products for conveyor systems. Although operating in the local market for decades through agencies, a subsidiary company was only formed in South Africa in 1992, a decision which has served to strengthen its presence even further. Markets are in the coal, gold and metalliferous mining sectors. The Flexco and Alligator range of fasteners are marketed in the US, New Zealand, Australia, Germany, Mexico and South Africa. The most recent acquisition was Clipper, based in Grand Rapids, USA. Clipper has a range of light weight fasteners complementary to the Alligator range. 2 photos.

  17. Investigation of used Conveyor Belts by the Differential Scanning Calorimetry Analysis

    Directory of Open Access Journals (Sweden)

    Lucia Knapcikova,

    2016-02-01

    Full Text Available In this paper is presented the use of differential scanning calorimetry analysis of the used conveyor belts. This method has been specifically tested on the individual components contained in the used conveyor belts esp. rubber pellets, cord and fabric. The result of the analysis is the determination of Tg temperature and melting temperatures (Tm by the components.Weanalyzed used conveyor belts and after this analysis it was determined components and their application to the industry

  18. Control strategy of disc braking systems for downward belt conveyors

    Institute of Scientific and Technical Information of China (English)

    Hou Youfu; Xie Fangwei; Huang Fei

    2011-01-01

    Reliability of braking systems is a key requirement to ensure the safety of in using downward belt conveyor brakes.By analyzing and comparing three commonly used braking velocity curves,we conclude that the Harrison curve is the best.Given the characteristics of a downward belt conveyor,we studied the control in a closed-loop velocity,a conventional PID method and an optimal PID control method.We used MATLAB/Simulink to simulate the three control methods.Our simulation results show that optimal PID control is especially suitable for disc braking systems.To verify the results from theoretical analysis and simulation,a multifunctional test-bed was developed to simulate the braking process of a disc brake system.Our experimental results demonstrate that the optimal PID control can make the output velocity to follow a preset velocity correctly with only small fluctuations,meeting the requirements of a flexible brake for a belt conveyor.

  19. Schmitt Trigger with Controllable Hysteresis Using Current Conveyors

    Directory of Open Access Journals (Sweden)

    Jiri Misurec

    2012-07-01

    Full Text Available Active elements working in the current or mixed mode are still attractive for the design of analog functional blocks. The current conveyor (CC was defined already in 1968. This paper deals with hysteresis comparators using second generation current conveyor. The comparator is basically a pulse circuit. In these circuits, the maximum rate of change in the output voltage is required during switching from one state to another. In comparators with operational amplifiers the switching time is given by the slew rate of the operational amplifier used, which is not too high. If a current conveyor is used, the time of switching the comparator gets shorter. The comparator is capable to operate at a higher frequency bands and if it is used, for example, in converters, a higher operating frequency can be reached. The connection of an inverting and a non-inverting comparator with adjustable hysteresis is shown as a practical implementation. Using the AD844, results of experimental measurements are presented that confirm the theoretical  assumptions and the results of computer simulation.

  20. PROPOSALS ON IMPROVING THE EXCAVATION, TRANSPORT AND COAL DEPOSIT, USING THE RUBBER CONVEYOR BELT

    Directory of Open Access Journals (Sweden)

    Nicoleta-Maria MIHUT

    2016-05-01

    Full Text Available In this work we make a study of the improvement methods of quantity of material transported by conveyor belt. Determination of discharge of solids entail establish of the parameters of the conveyor belt. As a result, we determine the belt speed who provide maximum discharge of solids materials.

  1. Dunlop Enerka Belting supplies and installs Europe's longest conveyor belt at British Coal-Mine

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    @@ Dunlop Enerka Belting of Farington, U.K., has supplied a steel cord conveyor belt to the mine complex at Selby in North Yorkshire operated by RJB Mining plc. The new conveyor belt replaces the belt supplied and installed in 1981 by Dunlop Enerka Belting (then BTR Belting Ltd.).

  2. Availability analysis of the main conveyor in the Svea Coal Mine in Norway

    Institute of Scientific and Technical Information of China (English)

    Simon Furuly; Javad Barabady; Abbas Barabadi⇑

    2014-01-01

    Reliability and maintainability of mining industry is more in focus than ever, and the mining systems are becoming more complex and the equipment more expensive to repair or modify. Unplanned failures can result in significant costs, especially when the machinery is hard to repair or spare parts are far away. This paper presents a case study describing a reliability and maintainability analysis of the main conveyor system of the Svea Coal Mine located in Svalbard, Norway. The conveyor system includes several separate conveyors. In this study, the main six conveyors of the whole system were selected for the analysis. The failure and repair data of the conveyors were collected for the whole year of 2010 using maintenance and daily reports. The date was analyzed and the result shows that the availability of six conveyers is 96.44%for one year of operation. However, reliability of these conveyers needs to be improved in order to reduce the number of failures.

  3. 3D-Virtualization of a Conveyor Machine

    OpenAIRE

    Taipalus, Joonas

    2016-01-01

    The purpose of this thesis was to create a virtually working 3D-model of a conveyor machine. The topic and the machine were provided by Siemens. Siemens will use this virtual model to ease their education, as it is not necessary to have the real equipment nearby. The first model was made in Solid Edge, and then transported to Siemens NX and MCD –software. The PLC-program was made in Siemens TIA portal. The connection between TIA portal and MCD was made with an OPC-server. The theory part of t...

  4. Single beam optical conveyor belt for chiral particles

    CERN Document Server

    Fernandes, David E

    2016-01-01

    We propose a novel paradigm to selectively manipulate and transport small engineered chiral particles and discriminate different enantiomers using unstructured chiral light. It is theoretically shown that the response of a chiral metamaterial particle may be tailored to enable an optical conveyor belt operation with no optical traps, such that for a fixed incident light helicity and independent of the nanoparticle location, it is either steadily pushed towards the direction of the photon flow or steadily pulled against the photon flow. Our findings create new opportunities for unconventional optical manipulations of tailored nanoparticles and may have applications in sorting racemic mixtures of artificial chiral molecules and in particle delivery.

  5. Effective Conveyor Belt Inspection for Improved Mining Productivity

    Energy Technology Data Exchange (ETDEWEB)

    David LaRose

    2006-07-01

    This document details progress on the project ''Effective Conveyor Belt Inspection for Improved Mining Productivity'' during the period from November 15, 2005 to May 14, 2006. Highlights include significant improvements in the accuracy and reliability of computer-vision based vulcanized splice detection, deployment of the vulcanized splice detection algorithms for daily use in two working mines, and successful demonstration of an early prototype of a Smart-Camera based system for on-site mechanical splice detection in coal mine installations.

  6. Nano-optical conveyor belt with waveguide-coupled excitation.

    Science.gov (United States)

    Wang, Guanghui; Ying, Zhoufeng; Ho, Ho-pui; Huang, Ying; Zou, Ningmu; Zhang, Xuping

    2016-02-01

    We propose a plasmonic nano-optical conveyor belt for peristaltic transport of nano-particles. Instead of illumination from the top, waveguide-coupled excitation is used for trapping particles with a higher degree of precision and flexibility. Graded nano-rods with individual dimensions coded to have resonance at specific wavelengths are incorporated along the waveguide in order to produce spatially addressable hot spots. Consequently, by switching the excitation wavelength sequentially, particles can be transported to adjacent optical traps along the waveguide. The feasibility of this design is analyzed using three-dimensional finite-difference time-domain and Maxwell stress tensor methods. Simulation results show that this system is capable of exciting addressable traps and moving particles in a peristaltic fashion with tens of nanometers resolution. It is the first, to the best of our knowledge, report about a nano-optical conveyor belt with waveguide-coupled excitation, which is very important for scalability and on-chip integration. The proposed approach offers a new design direction for integrated waveguide-based optical manipulation devices and its application in large scale lab-on-a-chip integration.

  7. Global ocean conveyor lowers extinction risk in the deep sea

    Science.gov (United States)

    Henry, Lea-Anne; Frank, Norbert; Hebbeln, Dierk; Wienberg, Claudia; Robinson, Laura; van de Flierdt, Tina; Dahl, Mikael; Douarin, Mélanie; Morrison, Cheryl L.; López Correa, Matthias; Rogers, Alex D.; Ruckelshausen, Mario; Roberts, J. Murray

    2014-06-01

    General paradigms of species extinction risk are urgently needed as global habitat loss and rapid climate change threaten Earth with what could be its sixth mass extinction. Using the stony coral Lophelia pertusa as a model organism with the potential for wide larval dispersal, we investigated how the global ocean conveyor drove an unprecedented post-glacial range expansion in Earth's largest biome, the deep sea. We compiled a unique ocean-scale dataset of published radiocarbon and uranium-series dates of fossil corals, the sedimentary protactinium-thorium record of Atlantic meridional overturning circulation (AMOC) strength, authigenic neodymium and lead isotopic ratios of circulation pathways, and coral biogeography, and integrated new Bayesian estimates of historic gene flow. Our compilation shows how the export of Southern Ocean and Mediterranean waters after the Younger Dryas 11.6 kyr ago simultaneously triggered two dispersal events in the western and eastern Atlantic respectively. Each pathway injected larvae from refugia into ocean currents powered by a re-invigorated AMOC that led to the fastest postglacial range expansion ever recorded, covering 7500 km in under 400 years. In addition to its role in modulating global climate, our study illuminates how the ocean conveyor creates broad geographic ranges that lower extinction risk in the deep sea.

  8. A Parametric Energy Model for Energy Management of Long Belt Conveyors

    Directory of Open Access Journals (Sweden)

    Tebello Mathaba

    2015-12-01

    Full Text Available As electricity prices continue to rise, the increasing need for energy management requires better understanding of models for energy-consuming applications, such as conveyor belts. Conveyor belts are used in a wide range of industries, including power generation, mining and mineral processing. Conveyor technological advances are leading to increasingly long conveyor belts being commissioned. Thus, the energy consumption of each individual belt conveyor unit is becoming increasingly significant. This paper proposes a generic energy model for belt conveyors with long troughed belts. The model has a two-parameter power equation, and it uses a partial differential equation to capture the variable amount of material mass per unit length throughout the belt length. Verification results show that the power consumption calculations of the newly proposed simpler model are consistent with those of a known non-linear model with an error of less than 4%. The online parameter identification set-up of the model is proposed. Simulations indicate that the parameters can be identified successfully from data with up to 15% measurement noise. Results show that the proposed model gives better predictions of the power consumed and material delivered by a long conveyor belt than the steady-state models in the current literature.

  9. Theoretical research on hydroviscous speed-adjusting clutch in soft-start of belt conveyor

    Institute of Scientific and Technical Information of China (English)

    ZHOU Man-shan; ZHANG Yuan

    2005-01-01

    Through research on the application of hydroviscous speed-adjusting clutch in belt conveyor, this paper concluded that hydroviscous speed-adjusting clutch has many advantages such as controllable start and stop, overload protection and multi-motor power equilibrium. But its theory when used in large power fan and pump could not meet the needs of belt conveyor soft-start operation. Focusing on the theoretical analysis of the lubrication oil flow needed by the transmission procedure to form the oil-film. Put forward concrete calculation methods of lubrication flow and how to decide number of oil-films used in belt conveyor.

  10. Advanced computer modeling techniques expand belt conveyor technology

    Energy Technology Data Exchange (ETDEWEB)

    Alspaugh, M.

    1998-07-01

    Increased mining production is continuing to challenge engineers and manufacturers to keep up. The pressure to produce larger and more versatile equipment is increasing. This paper will show some recent major projects in the belt conveyor industry that have pushed the limits of design and engineering technology. Also, it will discuss the systems engineering discipline and advanced computer modeling tools that have helped make these achievements possible. Several examples of technologically advanced designs will be reviewed. However, new technology can sometimes produce increased problems with equipment availability and reliability if not carefully developed. Computer modeling techniques that help one design larger equipment can also compound operational headaches if engineering processes and algorithms are not carefully analyzed every step of the way.

  11. Effects of industrial microcomputer use in control systems for machines and conveyors in surface mining

    Energy Technology Data Exchange (ETDEWEB)

    Borczyk, Z.; Rosseger, A. (Poltegor-Instytut, Wroclaw (Poland))

    1991-01-01

    Evaluates use of the ComPan Pzaz microcomputers manufactured in Poland for control of bucket wheel excavators without thrust action and for belt conveyors used in brown coal surface mines in Poland. The microcomputer consists of 14 standard microprocessor controller modules and 4 specialized modules. Structure of the control system, types of operations controlled by the system and effects of computerized control on safety and efficiency of operation of bucket wheel excavators are analyzed. Use of the ComPan Pzaz microcomputers for control of steep-angle conveyor systems (with a drive power from 1,000 kW to 4,000 kW) is evaluated. The system controls conveyor start-up and conveyor braking. Selected aspects of ComPan Pzaz reliability and service are also discussed. 2 refs.

  12. Digitally Controllable Current Amplifier and Current Conveyors in Practical Application of Controllable Frequency Filter

    Science.gov (United States)

    Polak, Josef; Jerabek, Jan; Langhammer, Lukas; Sotner, Roman; Dvorak, Jan; Panek, David

    2016-07-01

    This paper presents the simulations results in comparison with the measured results of the practical realization of the multifunctional second order frequency filter with a Digitally Adjustable Current Amplifier (DACA) and two Dual-Output Controllable Current Conveyors (CCCII +/-). This filter is designed for use in current mode. The filter was designed of the single input multiple outputs (SIMO) type, therefore it has only one input and three outputs with individual filtering functions. DACA element used in a newly proposed circuit is present in form of an integrated chip and the current conveyors are implemented using the Universal Current Conveyor (UCC) chip with designation UCC-N1B. Proposed frequency filter enables independent control of the pole frequency using parameters of two current conveyors and also independent control of the quality factor by change of a current gain of DACA.

  13. Design Analysis of Conveyor Mechanism Unit for Automatic Car Park System

    Directory of Open Access Journals (Sweden)

    Preeti S. Dambhare,

    2015-09-01

    Full Text Available The design analysis of a conveyor mechanism for an automatic car park is discussed. The conveyor assembly is made up of three units; the rack-pinion unit, the cable drive unit and the cantilever. The rack-pinion unit converts the rotational motion of a stepper motor to a linear forward and backward motion of the conveyor. The cable drive converts the rotational motion of another stepper motor to upward and downward motion of the cantilever to lift and lower the car at will. The cantilever is responsible for positioning the vehicle in the stack unit. The parameter for the cantilever is estimated to avoid excess deflection that could result from impact loading of a vehicle on the lift mechanism. The pinion-rack design for strength and rigidity is considered for the load required to be translated by the conveyor. The prototype was interfaced with a computer for operation using parallel port.

  14. Study on conveyor natural frequency and time interval for switching off resistances

    Institute of Scientific and Technical Information of China (English)

    李光布; 杨汝清

    2004-01-01

    A conveyor belt driven by wound rotor motors produces dynamic tension, velocity and acceleration during starting. The terrible situation (such as resonance) in dynamic analysis and design is that system natural frequencies are equal to those for switching off electric resistances. This paper analyzes and determines system natural frequencies based on a modeling method of receptances with the analysis of sub-systems model and of the principle of their addition and conveyor loop closure. It also puts forward to calculate the time interval for switching off electric resistances. The starting of one conveyor is simulated by lumped-mass-spring-model software to further illustrate the influence of time interval for switching off electric resistances on conveyor dynamic behavior. Two methods are also compared. The receptance model is proved to be an excellent alternative.

  15. Experimental Study of Kinetic Properties of Pyrolysis for Conveyor Belt in Coal Mine

    Institute of Scientific and Technical Information of China (English)

    SONG Zheng-chang

    2005-01-01

    The combustion of conveyor belt is a leading factor of mine fire. In this paper, the pyrolysis properties of ordinary conveyor belt and fire-resistant belt were studied experimentally with thermo-gravimetric analysis and derivative thermo-gravimetric analysis, and the curves of pyrolysis properties were achieved. On this basis, the activation energy and reaction order of pyrolysis were obtained in combination with theoretical analysis, aiming to provide data for further numerical simulation and simulating experiment of mine fire.

  16. Determination of The Mechanical Power in Belt Conveyor's Drive System in Industrial Conditions

    Science.gov (United States)

    Król, Robert; Kaszuba, Damian; Kisielewski, Waldemar

    2016-10-01

    Mechanical power is a value which carries a significant amount of information on the properties of the operating status of the machine analysed. The value of mechanical power reflects the degree of load of the drive system and of the entire machine. It is essential to determine the actual efficiency of the drive system η [%], which is the key parameter of the energy efficiency of the drive system. In the case of a single drive of a belt conveyor the actual efficiency is expressed as the ratio of mechanical output power Pm [W] at the drive pulley shaft to active electrical power drawn by the motor Pe [W]. Furthermore, the knowledge about the mechanical power from all drives of the multiple driven belt conveyor allows for the analysis of load distribution between the drives. In case of belt conveyor, the mechanical power Pm [W] generated by the drive at the drive pulley's shaft is equal to its angular velocity ω [rad / s] multiplied by the torque T [Nm]. The measurement of angular velocity is relatively easy and can be realized with the use of a tachometer or can be determined on the basis of linear velocity of the conveyor belt during belt conveyor's steady state operation. Significantly more difficult to perform in industrial conditions is the measurement of the torque. This is due to the operational conditions of belt conveyors (e.g. dustiness, high humidity, high temperature) and tight assembly of the drive components without the possibility of their disassembly. It makes it difficult or even impossible to measure the torque using a number of the techniques available, causing an individual approach to each object of research. The paper proposes a measurement methodology allowing to determine the mechanical power in belt conveyors drives which are commonly used in underground and surface mining. The paper presents result of the research into mechanical power in belt conveyor's drive carried out in underground mine conditions.

  17. THE INFLUENCE OF INCREASING RELIABILITY OF BELT CONVEYORS UPON THE PRODUCTIVITY OF LIGNITE QUARRIES

    Directory of Open Access Journals (Sweden)

    FLORIN-MIHAI NIȚESCU

    2012-10-01

    Full Text Available At present belt conveyors have an important role in the mines of lignite quarries because they contribute decisively to achieving an optimum production. From this point of view the management of mines should be constantly preoccupied with ensuring, in optimal conditions, the operation of these elements of fixed capital and, if it is necessary they should maintain constant reliability. In this context, this paper has as theme the relation between the reliability of conveyors and the productivity within lignite quarries.

  18. Optimizing the Pipe Diameter of the Pipe Belt Conveyor Based on Discrete Element Method

    Science.gov (United States)

    Guo, Yong-cun; Wang, Shuang; Hu, Kun; Li, De-yong

    2016-03-01

    In order to increase the transport volume of the pipe belt conveyor and reduce lateral pressure of the supporting roller set, this study aims to optimize the pipe diameter of the pipe belt conveyor. A mechanical model of the pipe belt conveyor with six supporting roller sets in the belt bearing section was built based on the infinitesimal method, and the formula for calculating the lateral pressure of each supporting roller was deduced on the basis of reasonable assumption. Simulated analysis was carried out on the operation process of the pipe belt conveyor by using the discrete element method. The result showed that, when the other conditions were certain, as the pipe diameter increased, the average lateral pressure of the supporting roller set increased, with a gradually decreasing increment, which was consistent with the calculated result of the theoretical formula. An optimized pipe diameter under the current conditions was obtained by fitting the curve of the formula for calculating the transport volume of the pipe belt conveyor and its simulation curve. It provided a certain reference value for improving the transport efficiency and prolonging the service life of the pipe belt conveyor.

  19. Mathematical description of the position of mining chain links on a driving chain wheel

    Energy Technology Data Exchange (ETDEWEB)

    Dolipski, M.

    1982-01-01

    The paper analyzes effects of geometry on interaction between the chain and chain wheels of face conveyors in underground coal mines. Interaction between chain links and wheel toothing is investigated using mathematical models. Three mesh types are comparatively evaluated, so-called normal mesh, nominal mesh and special mesh. Chain position on the chain wheel is shown in 3 schemes. Mathematical formulae used for characterizing mesh types are derived. Effects of the following factors on interaction between a chain link and a chain wheel are analyzed: link quality and differences in quality and dimensions among chain links, friction wear of links and toothing, elastic and plastic chain elongation, friction between links and toothing. A geometric model of the interaction between the chain wheel and haulage chain (in the form of a double polygon) is used. The mathematical model permits the following problems to be analyzed: load distribution among chain links on a chain wheel, load distribution on toothing, load fluctuations, effects of friction wear of chain and toothing. Examples of practical use of the formulae are discussed. (14 refs.)

  20. Programmable Input Mode Instrumentation Amplifier Using Multiple Output Current Conveyors

    Directory of Open Access Journals (Sweden)

    Pankiewicz Bogdan

    2017-03-01

    Full Text Available In this paper a programmable input mode instrumentation amplifier (IA utilising second generation, multiple output current conveyors and transmission gates is presented. Its main advantage is the ability to choose a voltage or current mode of inputs by setting the voltage of two configuration nodes. The presented IA is prepared as an integrated circuit block to be used alone or as a sub-block in a microcontroller or in a field programmable gate array (FPGA, which shall condition analogue signals to be next converted by an analogue-to-digital converter (ADC. IA is designed in AMS 0.35 µm CMOS technology and the power supply is 3.3 V; the power consumption is approximately 9.1 mW. A linear input range in the voltage mode reaches ± 1.68 V or ± 250 µA in current mode. A passband of the IA is above 11 MHz. The amplifier works in class A, so its current supply is almost constant and does not cause noise disturbing nearby working precision analogue circuits.

  1. Conveyor belts as factor in fire hazard in European coal mines

    Energy Technology Data Exchange (ETDEWEB)

    Zyska, B.

    1981-03-01

    Major mine accidents in the United Kingdom (Creswell, 1950), Czechoslovakia (Dukla, 1961) and in the Federal Republic of Germany (Schlagel und Eisen, 1977) caused by fires of conveyor belts are described. Methods of testing fire resistant conveyor belts, used in the following countries, are evaluated: Belgium, Czechoslovakia, France, German Democratic Republic, Federal Republic of Germany, Romania, Hungary, United Kingdom and USSR. The following methods are characterized: flame method, oxygen coefficient method, friction method, propane method, model tunnel method, 1 to 1 scale tunnel method, calorimetric method and a so-called flame tube method. Comparative evaluation of the methods and their efficiency is presented. Development of non-inflammable conveyor belts in: Czechoslovakia, Federal Republic of Germany and in the United Kingdom is discussed (elimination of rubber belts and introduction of PVC belts). It is stressed that three methods of testing fire resistance of conveyor belts are of particular importance: friction method, model tunnel method and 1 to 1 scale tunnel method. Standards used in Poland to test properties of conveyor belts are also described. 44 refs.

  2. Research on Magnetic Model of Low Resistance Permanent Magnet Pipe Belt Conveyor

    Science.gov (United States)

    Wang, Shuang; Li, De-yong; Guo, Yong-cun

    2016-09-01

    In view of the feasibility of a new type of low resistance permanent magnet pipe belt conveyor, the magnetic properties of the permanent magnet magnetic pipe conveyor belt system are studied. Based on the molecular current hypothesis, the mathematical model of the three dimensional radial magnetic force of permanent magnet pipe conveyor belt was established. The mathematical model of the radial magnetic force was derived, and the influence factors of the radial magnetic force were derived. The finite element simulation of permanent magnet-magnetic pipe conveyor belt magnetic model was carried out, then the magnetic flux density distribution chart under the conditions of different remanence intensity of different permanent magnet and different lengths of the permanent magnets (along the transport direction) were obtained. The simulation results are consistent with the calculation results, which shows that the permanent magnet pipe belt conveyor is feasible. Under certain conditions, the radial magnetic force has nonlinear increase relations with residual magnetism of permanent magnet and the length of the permanent magnet (along the transport direction).

  3. The Question of Energy-Efficient Design of the Automated Electric Drive of Multi-Engine Belt Conveyors

    Directory of Open Access Journals (Sweden)

    Semykina Irina

    2015-01-01

    Full Text Available The article proposes a method for improving the energy efficiency of multi-motor variable frequency electric drives of trunk belt conveyors, based on the conveyor speed changing and controlling of the magnetic state of the motor. At conclusion, economic and energy effects of the implementation are estimated.

  4. Optimal Driving of Large Belt Conveyor with Multi-roller Variable-Frequency Drive

    Institute of Scientific and Technical Information of China (English)

    FU Jun-qing; WANG Cong; LI Yu-jin

    2004-01-01

    in this paper, an electromechanically coupled mathematic model of multi-roller driving system for belt conveyor is set up, and the computing equations for dynamic displacement and dynamic tension of the conveyor are also formulated when the hoister is used for straining. Based on the belt conveyor of main inclined shaft in Chengzhuang coal mine, the driving torque, driving power and starting-speed characteristic of each electric motor are studied and measured when multi-roller variable-frequency drive (power distribution 2∶1) is used. The optimal control and the optimal starting-acceleration of the multi-roller variable-frequency drive are determined by a large number of industrial experiments and theoretical calculations.

  5. Design of belt conveyor electric control device based on CC-link bus

    Science.gov (United States)

    Chen, Goufen; Zhan, Minhua; Li, Jiehua

    2016-01-01

    In view of problem of the existing coal mine belt conveyor is no field bus communication function, two levels belt conveyor electric control system design is proposed based on field bus. Two-stage belt conveyor electric control system consists of operation platform, PLC control unit, various sensors, alarm device and the water spraying device. The error protection is realized by PLC programming, made use of CC-Link bus technology, the data share and the cooperative control came true between host station and slave station. The real-time monitor was achieved by the touch screen program. Practical application shows that the system can ensure the coalmine production, and improve the automatic level of the coalmine transport equipment.

  6. Current and Voltage Conveyors in Current- and Voltage-Mode Precision Full-Wave Rectifiers

    Directory of Open Access Journals (Sweden)

    J. Koton

    2011-04-01

    Full Text Available In this paper new versatile precision full-wave rectifiers using current and/or voltage conveyors as active elements and two diodes are presented. The performance of these circuit solutions is analysed and compared to the opamp based precision rectifier. To analyze the behavior of the functional blocks, the frequency dependent RMS error and DC transient value are evaluated for different values of input voltage amplitudes. Furthermore, experimental results are given that show the feasibilities of the conveyor based rectifiers superior to the corresponding operational amplifier based topology.

  7. Feeding Control System of Conveyor-belt Based on Image Processing

    Institute of Scientific and Technical Information of China (English)

    MENG Fan-qin; WANG Yao-cai; XI Li-bo; WANG Jun-wei

    2004-01-01

    Based on the real time measurement of the width of coal flow, the method for measuring the width and the relative position of coal flow on a conveyor-belt by image processing was presented. A feeding control system of conveyor-belt was proposed using a fuzzy controller. This control system consists of CCD camera, universal image sampling system, control network and executor. The result shows that the algorithm used in the image processing is simple and efficient, and the measuring error of width is less than 4%.

  8. In Retrospect, Five Year's Splendid Journey of Wind and Rain,Look into the Future, Five Year's Grand Prospect--Shanxi Phoenix Conveyor Belt Co., Ltd.

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

      On January 21, 2006, ShanxiPhoenix Conveyor Belt Co.,Ltd. held the 2005 Honor Convention. Those who attended the conference were Mr. Ren Runhou, Board Chairman of Shanxi Phoenix Conveyor Belt Co., Ltd., Board Chairman & General Manager of Shanxi Luan Mining Group, Mr. Shi Wenlin, Director of Shanxi Phoenix Conveyor Belt Co., Ltd.,Vice General Manager of Shanxi Luan Mining Group, Dr. Feng Weimin, General Manager of Shanxi Phoenix Conveyor Belt Co., Ltd. and Mr. Feng Qiang,Administrative General Manager of Shanxi Phoenix Conveyor Belt Co., Ltd.The conference was presided by Vice General Manager Zhu Junhong.……

  9. In Retrospect, Five Year's Splendid Journey of Wind and Rain,Look into the Future, Five Year's Grand Prospect--Shanxi Phoenix Conveyor Belt Co., Ltd.

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    @@ On January 21, 2006, ShanxiPhoenix Conveyor Belt Co.,Ltd. held the 2005 Honor Convention. Those who attended the conference were Mr. Ren Runhou, Board Chairman of Shanxi Phoenix Conveyor Belt Co., Ltd., Board Chairman & General Manager of Shanxi Luan Mining Group, Mr. Shi Wenlin, Director of Shanxi Phoenix Conveyor Belt Co., Ltd.,Vice General Manager of Shanxi Luan Mining Group, Dr. Feng Weimin, General Manager of Shanxi Phoenix Conveyor Belt Co., Ltd. and Mr. Feng Qiang,Administrative General Manager of Shanxi Phoenix Conveyor Belt Co., Ltd.The conference was presided by Vice General Manager Zhu Junhong.

  10. Survival of Listeria monocytogenes on a conveyor belt material with or without antimicrobial additives

    NARCIS (Netherlands)

    Chaitiemwong, N.; Hazeleger, W.C.; Beumer, R.R.

    2010-01-01

    Survival of Listeria monocytogenes on a conveyor belt material with or without antimicrobial additives, in the absence or presence of food debris from meat, fish and vegetables and at temperatures of 10, 25 and 37 °C was investigated. The pathogen survived best at 10 °C, and better at 25 °C than at

  11. Theoretical and experimental investigation on optimization of a non-contact air conveyor

    Institute of Scientific and Technical Information of China (English)

    钟伟; 黎鑫; 陶国良; 路波; 香川利春

    2016-01-01

    Air film conveyors equipped with porous pads have been developed to bring the liquid crystal display (LCD) into a non-contact state during transportation process. In this work, a theoretical model including flow property of porous media and Reynolds equation is established within a representative region in order to optimize the design parameters of a partial porous air conveyor. With the theoretical model, an optimization method using nondominated sorting genetic algorithm – II (NSGA-II) is applied for a two-objective optimization to achieve a minimum air consumption and maximum load capacity. Three Pareto-optimal solutions are selected to analyze the influence of each parameter on the characteristics of the air conveyor, and the results indicate that the position of the porous pads has the most significant impact on the performance and of course must be determined with care. Furthermore, experimental results in terms of the supporting force versus gap clearance show that the optimized air conveyor can greatly improve the load capacity over the normal one, indicating that the optimization method is applicable for practical use.

  12. Influence of diabatic processes on the PV development in a warm conveyor belt

    Science.gov (United States)

    Joos, H.; Wernli, H.

    2010-09-01

    Warm conveyor belts are frequent features of extratropical cyclones in the Northern Hemisphere. In the strongly ascending airstreams clouds are forming whereas the latent heat release further increases the upward motion. The potential vorticity (PV) in the conveyor belt is strongly influenced by the microphysical processes occurring during the formation of clouds. In general, the PV increases below the maximum diabatic heating and decreases above. Thus, the conveyor belt reaches the upper troposphere with low PV values and therefore has the potential to influence the large scale dynamics. In order to assess the influence of the different microphysical processes like condensation, freezing, evaporation, sublimation, etc. on the PV development during the ascent, a Lagrangian based analysis is used. First, simulations with the COSMO Model are performed in order to calculate the individual diabatic heating rates caused by various transfer processes between hydrometeors. Then, the diabatic heating rates and the associated change in PV are calculated along trajectories in a warm conveyor belt. It can be seen that ice phase processes as well as condensation/evaporation strongly modify the PV during the ascent. Therefore, small scale microphysical processes have the potential to modify the large scale dynamics as airstreams with a strongly modified PV reach the upper troposphere.

  13. Some aspects of the characteristics of vertical screw conveyors for granular material

    NARCIS (Netherlands)

    Rademacher, F.J.C.

    1974-01-01

    A theory has been developed, based on a physical model, to describe the behaviour of non-cohesive granular material inside a vertical screw conveyor. By use of this theory, relationships have been derived between dimensionless numbers for capacity, power consumption and efficiency. These relationshi

  14. Converter-controlled belt conveyor systems under the difficult conditions; Umrichtergesteuerte Bandanlagen unter schwierigen Bedingungen

    Energy Technology Data Exchange (ETDEWEB)

    Horz, Michael-Josef [RAG Deutsche Steinkohle, Herne (Germany). Abt. Elektrotechnik unter Tage; Mueller, Uwe [RAG Deutsche Steinkohle, Herne (Germany). Servicebereich Technik- und Logistikdienste

    2010-05-15

    Panel 572 is located at a depth of 1,200 m in the Girondelle seam at the West mine. The panel has a mean thickness of 2.5 m and is designed as a shearer loader face with a length of 460 m. Coal is conveyed to the shaft by six belts with a total length of about 6 km and a total lifting height of 396 m. The main conveyor belt 1 with an installed power of 3 MW links the panel to a bunker. Conveyor belts 2 to 4 each with 500 kW drive power have operated in a stable manner since the start of working of the panel. Due to in-seam drivage with a selective-cut machine of type AM 85 an area with a marked trough was produced in the coal conveyor road. This area is traversed by belt 5. The planning and control of the conveyor belt in this difficult geological environment impose high demands on drive and control technology. To ensure stable operation under different loads a raft of measures was resolved and implemented. The contribution examines the problem and describes the implemented measures in detail. (orig.)

  15. Análisis y solución de avería del acoplamiento del sinfín de fondo de la Bañera de una Planta de Plástico Mixto. // Analysis and solution of the coupling failure of the bottom worm conveyor of the bathtub in a Mixed Plastic Plant.

    Directory of Open Access Journals (Sweden)

    R. Goytisolo Espinosa

    2004-09-01

    Full Text Available En el trabajo se realizó una investigación para esclarecer las causas de la avería del acoplamiento del sinfín de fondo de labañera de una planta de plástico mixto. En la misma se concluyó que las causas fundamentales de las obstrucciones delsinfín de fondo son el hecho de que el sinfín de elevación de la bañera tiene una capacidad cuatro veces menor que el sinfínde fondo, lo que provoca que el material se acumule en el fondo de la bañera y por otro lado la comunicación entre el sinfínde fondo y el de elevación se produce a través de un tubo vertical de capacidad reducida, que constituye también un cuellode botella. Se modificó la relación de transmisión de la cadena del accionamiento del sinfín de elevación para elevar suvelocidad e igualar la capacidad de transportación de ambos sinfines y se eliminó el tubo de conexión entre los mismos. Elacoplamiento se fabricó de plástico poliamídico, lográndose una adecuada resistencia.Palabras claves: Bañera de plástico, transportadores sinfín, acoplamiento dentado.___________________________________________________________________________Abstract.In this paper is shown the investigation carried out in order to clarify the failure causes of the coupling of the bottom wormconveyor of the bathtub in a Mixed Plastic Plant. In the same was it was concluded that the fundamental causes of theobstructions of the bottom conveyor are the fact that the elevator worm conveyor of the bathtub has a capacity four timesminor that the bottom conveyor, which causes that the material accumulates in the bottom of the bathtub, and on the otherhand the communication between the bottom conveyor and the elevator one takes place through a vertical tube of reducedcapacity that also constitutes a bottle neck. The transmission relationship of the chain of the elevator working conveyor wasmodified in order to elevate their speed and to equal the capacity of transportation of both conveyors, and the

  16. 长距离带式输送机选型设计%Selection Design of Long Belt Conveyor

    Institute of Scientific and Technical Information of China (English)

    王颖; 陶焜

    2015-01-01

    文章介绍了长距离带式输送机的选型设计方法,并依据给定设计参数对输送机的传动滚筒、拉紧装置、输送带以及电控等主要部件进行选型设计。%This paper introduces the selection of long belt conveyor design method, and based on the given design parame-ters on the conveyor drive roller, drives, tensioning device, conveyor belts and so on major components of the selection and design, focusing on the conveyor belt tension analyzed and calculated, and finally gives a reasonable start-up mode and elec-tronically controlled program.

  17. Modelling and control algorithms of the cross conveyors line with multiengine variable speed drives

    Science.gov (United States)

    Cheremushkina, M. S.; Baburin, S. V.

    2017-02-01

    The paper deals with the actual problem of developing the control algorithm that meets the technical requirements of the mine belt conveyors, and enables energy and resource savings taking into account a random sort of traffic. The most effective method of solution of these tasks is the construction of control systems with the use of variable speed drives for asynchronous motors. The authors designed the mathematical model of the system ‘variable speed multiengine drive – conveyor – control system of conveyors’ that takes into account the dynamic processes occurring in the elements of the transport system, provides an assessment of the energy efficiency of application the developed algorithms, which allows one to reduce the dynamic overload in the belt to 15-20%.

  18. System for conveyor belt part picking using structured light and 3D pose estimation

    Science.gov (United States)

    Thielemann, J.; Skotheim, Ø.; Nygaard, J. O.; Vollset, T.

    2009-01-01

    Automatic picking of parts is an important challenge to solve within factory automation, because it can remove tedious manual work and save labor costs. One such application involves parts that arrive with random position and orientation on a conveyor belt. The parts should be picked off the conveyor belt and placed systematically into bins. We describe a system that consists of a structured light instrument for capturing 3D data and robust methods for aligning an input 3D template with a 3D image of the scene. The method uses general and robust pre-processing steps based on geometric primitives that allow the well-known Iterative Closest Point algorithm to converge quickly and robustly to the correct solution. The method has been demonstrated for localization of car parts with random position and orientation. We believe that the method is applicable for a wide range of industrial automation problems where precise localization of 3D objects in a scene is needed.

  19. Design Considerations for CMOS Current Mode Operational Amplifiers and Current Conveyors

    DEFF Research Database (Denmark)

    Bruun, Erik

    This dissertation is about CMOS current conveyors and current mode operational amplifiers (opamps). They are generic devices for continuous time signal processing in circuits and systems where signals are represented by currents.Substantial advancements are reported in the dissertation, both...... related to circuit implementations and system configurations and to an analysis of the fundamental limitations of the current mode technique.In the field of system configurations and circuit implementations different configurations of high gain current opamps are introduced and some of the first...... implementations of current mode opamps in CMOS technology are described. Also, current conveyor configurations with multiple outputs and flexible feedback connections from outputs to inputs are introduced. The dissertation includes several examples of circuit configurations ranging from simple class A and class...

  20. Dynamics simulation of the belt conveyor possessing feedback loop during starting

    Institute of Scientific and Technical Information of China (English)

    XI Ping-yuan; ZHANG Hai-tao; LIU Jun

    2005-01-01

    Synthesizing the mechanical models of the belt, the driver and the take-up device, the dynamics model was established on the longitudinal vibration of the overall belt conveyor system with finite elemental method, and S-function simulation block of asynchronous motor owing feedback function was built in Matlab/Simulink software, the simulation block indicates that motor rotation speed and its output moment vary with load and time, and the motor is a dynamic feedback system in working process. The state space block was adopted to express model of the belt. Thus it created simulation model of established dynamic model of overall belt conveyor system with Matlab/Simulink software, and simulates the course of starting by properly setting simulation parameters, and processes data for visualization.

  1. Analytical model of load stream transformation in conveyor-hopper haulage systems in coal mines

    Energy Technology Data Exchange (ETDEWEB)

    Kreimer, E.L. (DonUGI (USSR))

    1989-11-01

    Haulage of coal and mine stones by a system of conveyors and coal hoppers is treated as a stochastic process. Stream of coal flowing from working faces by a conveyor-hopper system is characterized by the G{sub 6} vector consisting of 6 linearly independent parameters: a coefficient of load stream advance, mathematical expectation, standard deviation, maximum coal stream, correlation period of coal stream, mathematical expectation of the length of coal supply periods. An analytical model which permits the G{sub 6} vector to be calculated at any stage of coal haulage system is developed. Analyses show that a coal haulage system is accurately described by a multistage Markov process. 10 refs.

  2. Modeling a magneto-rheological soft starter for use with belt conveyors

    Institute of Scientific and Technical Information of China (English)

    Tian Zuzhi; Hou Youfu

    2012-01-01

    The theory of magnetic circuit design,the constitutive equations of a magneto-rheological fluid,and the load properties of belt conveyors were used to design a magneto-rheological soft starter test-bed.The magnetic field distribution in the working gap was analyzed and the current-speed relationship was investigated.A mathematical model for the time response was deduced.The results show that a linear relationship between current and magnetic field is seen when the magnetic materials are not saturated and the magnetic field is uniform in the working section.The rotation speed of the driven shaft changes linearly with increasing time.The response is rapid and can be as short as milliseconds.This meets the starting requirements of belt conveyors.

  3. INFLUENCE CONSTRUCTION OF THE ROLLER ON THE POWER OF THE DRIVE SYSTEM OF THE BELT CONVEYOR

    Directory of Open Access Journals (Sweden)

    Tadeusz OPASIAK

    2014-09-01

    Full Text Available The paper presents a study of new design of rollers. The study focused on the measurement of static and dynamic resistance of rotating rollers and the impact of new construction on the power consumption of the belt conveyor. Rollers have been modified through the use of class C4 bearing seals and labyrinth seal U4Exp 62/65 with a cover 2LU4 of runner construction. Measurements of static and dynamic resistance of rotating rollers were made on a universal rollers stand and power measurements were carried out on a belt conveyor power supply system Gwarek 1200 No. TW in mine KWK Mysłowice–Wesoła.

  4. Singularity Detection of Magnetic Memory Signal of Steel-Cord Conveyor Belt

    Directory of Open Access Journals (Sweden)

    Qiao Tiezhu

    2013-09-01

    Full Text Available Metal magnetic memory technology was an important method for detecting the steel-cord conveyor belt early fault, characteristics of magnetic memory signal extraction is critical for judging of the conveyor belt failure. Generally using of magnetic memory signal maximum gradient value can quickly judge the stress concentration zone, but the magnetic memory signal is susceptible to effected by environmental and noise; In view of the weak and non-stationary characteristics of magnetic memory signal, this paper has proposed the singularity detection method based on wavelet transform modulus maximum for metal magnetic memory signal, the method could exactly judged the stress concentration zone of joints and located the fault points of the steel-cord belt, the characteristic gradient of magnetic memory signal and the Lipschitz exponent were extracted. The result of simulation indicated the technology was effectively for judging the stress concentration zone and fault point. ��

  5. Minimising the fire hazard from the use of belt conveyors in intake roadways

    Energy Technology Data Exchange (ETDEWEB)

    Leeming, J.R. [Health and Safety Executive, Sheffield, S. Yorkshire (United Kingdom)

    2010-07-01

    The fire that occurred a the Creswell underground coal mine in Derbyshire in 1950 in which 90 miners lost their lives was caused by a damaged rubber conveyor belt that ignited after being friction heated. The fire propagated along the intake trunk roadway by the burning belt itself, which ignited the timber roadway supports and hampered fire-fighting efforts. This paper demonstrated that operating conveyors in intake trunk roadways presents a risk that products of combustion can be carried to the working areas of a mine via ventilation pathways, thus creating a hazard to the underground miners. In North America, the use of belt air is not commonly used to ventilate working areas. However, these arrangements are common in the United Kingdom. As such, installation, inspection and maintenance standards have been created to minimize the risk of fire in underground, remotely operated belt conveyors in underground mines. Monitoring systems are also in place for early detection of any fire. A review of recent underground fires in the United Kingdom has shown that the measures adopted have been successful in avoiding uncontrollable fires. 13 refs., 5 figs.

  6. Impact of Selected Parameters on the Fatigue Strength of Splices on Multiply Textile Conveyor Belts

    Science.gov (United States)

    Bajda, Mirosław; Błażej, Ryszard; Hardygóra, Monika

    2016-10-01

    Splices are the weakest points in the conveyor belt loop. The strength of these joints, and thus their design as well as the method and quality of splicing, determine the strength of the whole conveyor belt loop. A special zone in a splice exists, where the stresses in the adjacent plies or cables differ considerably from each other. This results in differences in the elongation of these elements and in additional shearing stresses in the rubber layer. The strength of the joints depends on several factors, among others on the parameters of the joined belt, on the connecting layer and the technology of joining, as well as on the materials used to make the joint. The strength of the joint constitutes a criterion for the selection of a belt suitable for the operating conditions, and therefore methods of testing such joints are of great importance. This paper presents the method of testing fatigue strength of splices made on multi-ply textile conveyor belts and the results of these studies.

  7. Research of x-ray nondestructive detector for high-speed running conveyor belt with steel wire ropes

    Science.gov (United States)

    Wang, Junfeng; Miao, Changyun; Wang, Wei; Lu, Xiaocui

    2008-03-01

    An X-ray nondestructive detector for high-speed running conveyor belt with steel wire ropes is researched in the paper. The principle of X-ray nondestructive testing (NDT) is analyzed, the general scheme of the X-ray nondestructive testing system is proposed, and the nondestructive detector for high-speed running conveyor belt with steel wire ropes is developed. The hardware of system is designed with Xilinx's VIRTEX-4 FPGA that embeds PowerPC and MAC IP core, and its network communication software based on TCP/IP protocol is programmed by loading LwIP to PowerPC. The nondestructive testing of high-speed conveyor belt with steel wire ropes and network transfer function are implemented. It is a strong real-time system with rapid scanning speed, high reliability and remotely nondestructive testing function. The nondestructive detector can be applied to the detection of product line in industry.

  8. 煤矿井下带式输送机驱动系统浅析%Analysis of Driving System for Belt Conveyor

    Institute of Scientific and Technical Information of China (English)

    张志飞

    2015-01-01

    文章通过对输送机驱动系统的讨论比较,给出了不同驱动方式的优缺点,并对变频控制技术及电动滚筒驱动的带式输送机的发展前景进行了展望,为煤矿井下皮带输送机驱动系统合理选型提供支撑。%Belt conveyor in coal mine got a lot of applications,Through the discussion of the conveyor drive system,the paper presented the advantages and disadvantages of different driving modes,And prospected the development of the belt conveyor of frequency control technology and electric drum-driven conveyor,it procide support for a reasonable selection of drive system of coal mine belt conveyor.

  9. Use of computational fluid dynamics simulations for design of a pretreatment screw conveyor reactor.

    Science.gov (United States)

    Berson, R Eric; Hanley, Thomas R

    2005-01-01

    Computational fluid dynamics simulations were employed to compare performance of various designs of a pretreatment screw conveyor reactor. The reactor consisted of a vertical screw used to create cross flow between the upward conveying solids and the downward flow of acid. Simulations were performed with the original screw design and a modified design in which the upper flights of the screw were removed. Results of the simulations show visually that the modified design provided favorable plug flow behavior within the reactor. Pressure drop across the length of the reactor without the upper screws in place was predicted by the simulations to be 5 vs 40 kPa for the original design.

  10. THE HARMONIZATION AND OPTIMIZATION OF DIAGNOSTIC METHODS FOR A BELT CONVEYOR

    Directory of Open Access Journals (Sweden)

    František HELEBRANT

    2012-04-01

    Full Text Available The final aim of the project MPO FR‐T11/537 called “The Complex Diagnostic System for the Belt Transport” is a single part custom manufacturing and sale of complex diagnostic system for belt transportation and related services. The output of the project is a prototype of a diagnostic system on a model belt conveyor with prepared and certified diagnostic services and methods including their measurements and other supportive tools. The article will introduce the present state of the solution for the given grant project, especially in the field of suggested work on the diagnostic and supportive methods and other measurements.

  11. Movement analysis on steel wire rope of continuous conveyor with disc-tube assembly

    Institute of Scientific and Technical Information of China (English)

    LUAN Li-jun; SHI Shu-lin; REN Li-yi

    2004-01-01

    The steel wire rope of continuous conveyor with disc-tube assembly is droved by the driving wheel. When the driving wheel rotates, the gear is combined to the connection disc in turn, promoting the connection disc to move in succession. Turning the whirling torque of driving wheel into the straight-line traction force. When the steel wire rope is winded by the driving wheel some winded along the circumference, others winded along the straight line. Used motion subject law, this article analyses the change of the velocity and the acceleration of the steel wire rope in the straight movement, and observe the mathematics' model of velocity and acceleration.

  12. Surveying the face head advance rate and the face conveyor position. Ueberwachung des Strebfrontverlaufs und der Lage von Strebfoerdermitteln

    Energy Technology Data Exchange (ETDEWEB)

    1975-01-01

    For a constant monitoring of the face work and the position of the face conveyor, continuous surveying of the conveyor systems is required. This publication of the Steinkohlenbergbauverein describes two well-established surveying techniques using either a folding rule or a tape measure or advance rate meter. The latter is described with regard to its design and functions. Both methods are quasisteady methods which can be carried out by the working staff or by the foreman without disturbing operations and with hardly any loss of time. (MOS).

  13. 一种螺旋输送机的改进设计%An Improved Design of the Screw Conveyor

    Institute of Scientific and Technical Information of China (English)

    左章华

    2014-01-01

    通过一次闲置的螺旋输送机改造过程,叙述了螺旋输送机改造中需要注意的几个相关事项,并对螺旋输送机现场改造中涉及到的问题提出了相应的解决办法。%In this paper ,through the transformation process of an idle screw conveyor ,describes several re-lated issues that need attention on the transformation of the screw conveyor , and on-site issues related to this transformation,here advance a corresponding solution .

  14. Falling chains

    Science.gov (United States)

    Wong, Chun Wa; Yasui, Kosuke

    2006-06-01

    The one-dimensional fall of a folded chain with one end suspended from a rigid support and a chain falling from a resting heap on a table is studied. Because their Lagrangians contain no explicit time dependence, the falling chains are conservative systems. Their equations of motion are shown to contain a term that enforces energy conservation when masses are transferred between subchains. We show that Cayley's 1857 energy nonconserving solution for a chain falling from a resting heap is incorrect because it neglects the energy gained when a link leaves a subchain. The maximum chain tension measured by Calkin and March for the falling folded chain is given a simple if rough interpretation. Other aspects of the falling folded chain are briefly discussed.

  15. Análisis estructural de un transportador de banda. // Structural analysis of a band conveyor.

    Directory of Open Access Journals (Sweden)

    P. Alvarez Barreras

    2001-07-01

    Full Text Available El presente trabajo contiene el análisis de comprobación de la estructura de la cuna de una máquina transportadora debanda. En el mismo se determinan las cargas de servicio y las condiciones de apoyo, se efectúa el cálculo lineal por elmétodo de los elementos finitos, y finalmente se valoran los resultados en forma de:· Análisis de las tensiones.· Análisis de los desplazamientos.· Análisis de las deformaciones.Palabras claves: Transportador de banda, estructura, análisis de tensiones, elementos finitos.________________________________________________________________________________AbstractThe present work contains the structure analysis of a belt conveyor cradle. The operation loads and conditions of supportare determined, the lineal calculation is made by the Finite Element Method, and finally the results are valued in form of:· Analysis of tensions.· Analysis of displacements.· Analysis of deformations.Key words: Belt conveyor cradle, structure, tension analysis, finite element.

  16. New equipment for shifting belt conveyors and rails of basic mining machines

    Energy Technology Data Exchange (ETDEWEB)

    Dembinski, M.

    1977-07-01

    Notes that equipment used in the Polish brown coal surface mines for shifting belt conveyors and rail tracks is easily damaged, particularly under difficult mining conditions in autumn and spring. After the difficult season 1974-1975 the Poltegor Project Center investigated the possibility of constructing new equipment for shifting rails and belt conveyors. In January 1976 the first three prototypes of the PP-12 shifting machine, installed on the DET-250 tractor (produced in GDR), and with GP-12 type grab, were produced. The first tests of PP-12 machines in brown coal surface mines under difficult conditions were positive. The amount of damage decreased, wear of parts also decreased, fuel consumption fell and efficiency of the shifting machines increased. The price of one GP-12 grab produced according to plans developed by Poltegor is 4 times lower than price of the grab imported from FRG (produced by Krupp). Detailed technical specifications of the PP-12 shifting machine as well as the GP-12 grab are given. (In Polish)

  17. Numerical evaluation of turbulence models for dense to dilute gas-solid flows in vertical conveyor

    Institute of Scientific and Technical Information of China (English)

    Salar Azizi; Dariush Mowla; Goodarz Ahmadi

    2012-01-01

    A two-fluid model (TFM) of multiphase flows based on the kinetic theory and small frictional limit boundary condition of granular flow was used to study the behavior of dense to dilute gas-solid flows in vertical pneumatic conveyor.An axisymmetric 2-dimensional,vertical pipe with 5.6 m length and 0.01 m internal diameter was chosen as the computation domain,same to that used for experimentation in the literature.The chosen particles are spherical,of diameter 1.91 mm and density 2500 kg/m3.Turbulence interaction between the gas and particle phases was investigated by Simonin's and Ahmadi's models and their numerical results were validated for dilute to dense conveying of particles.Flow regimes transition and pressure drop were predicted.Voidage and velocity profiles of each phase were calculated in radial direction at different lengths of the conveying pipe.It was found that the voidage has a minimum,and gas and solid velocities have maximum values along the center line of the conveying pipe and pressure drop has a minimum value in transition from dense slugging to dilute stable flow regime.Slug length and pressure fluctuation reduction were predicted with increasing gas velocity,too.It is shown that solid phase turbulence plays a significant role in numerical prediction of hydrodynamics of conveyor and the capability of particles turbulence models depends on tuning parameters of slip-wall boundary condition.

  18. Transport of stone material by conveyor belt. Transporte de materiales rocosos por cintas transportadoras

    Energy Technology Data Exchange (ETDEWEB)

    Herranz Villafruela, F. (Lignitos de Meirama S.A., La Coruna (Spain))

    1990-04-01

    During one of the phases of the project (1976) to extract the brown lignite discovered in the Meirama valley (La Coruna) by opencast mining, it was decided, for economic reasons, to transport shale to the spoil tips by conveyor belts. Working on the basis of entirely theoretical data, for want of experience in this field, this waste stone material was crushed as near as possible to the working face in order to make it small enough to be transported by the general conveyor belt system. For this purpose, a semi-mobile crushing unit was selected which advances by means of a hydraulic platform mounted on caterpillar tracks. After several years of operation in the mining environment with what at the beginning was a totally new method, it can be confirmed that a saving has been made in the cost of transporting waste material compared to the use of dumper trucks and their two main cost elements - energy and spare parts. 4 figs., 2 tabs.

  19. Computational fluid dynamics simulation and redesign of a screw conveyor reactor.

    Science.gov (United States)

    Wan, Yinkun; Hanley, Thomas R

    2004-01-01

    National Renewable Energy Laboratory (NREL) designed a shrinking-bed reactor to maintain a constant bulk packing density of cellulosic biomass. The high solid-to-liquid ratio in the pretreatment process allows a high sugar yield and avoids the need to flush large volumes of solution through the reactor. To scale up the shrinking-bed reactor, NREL investigated a pilot-scale screw conveyor reactor in which an interrupted flight between screws was employed to mimic the "shrinking-bed" effect. In the experiments with the screw conveyor reactor, overmixing and uneven flow occurred. These phenomena produce negative effects on biomass hydrolysis. The flow behavior inside the reactor was analyzed to allow redesign of the screw to achieve adequate mixing and even flow. In the present study, computational fluid dynamics (CFD) was utilized to simulate the fluid flow in the porous media, and a new screw design was proposed. CFD analysis performed on the redesigned reactor indicated that an even flow pattern was achieved.

  20. 30 CFR 75.1101 - Deluge-type water sprays, foam generators; main and secondary belt-conveyor drives.

    Science.gov (United States)

    2010-07-01

    ... 30 Mineral Resources 1 2010-07-01 2010-07-01 false Deluge-type water sprays, foam generators; main and secondary belt-conveyor drives. 75.1101 Section 75.1101 Mineral Resources MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR COAL MINE SAFETY AND HEALTH MANDATORY SAFETY STANDARDS-UNDERGROUND COAL MINES Fire Protection §...

  1. Unwrapping Chains

    CERN Document Server

    Cambou, A D; Hamm, E; Hanna, J A; Menon, N; Santangelo, C D; Walsh, L

    2012-01-01

    A loop of chain can move along its own tangents, maintaining a steady shape. An open-ended chain undergoing a nontrivial motion must change its shape. One consequence is that chains pulled around objects will fail to follow the contours of the objects, unwrapping themselves instead. This short note accompanies a fluid dynamics video submission (83068) to the APS DFD Gallery of Fluid Motion 2012.

  2. Falling chains

    CERN Document Server

    Wong, C W; Wong, Chun Wa; Yasui, Kosuke

    2006-01-01

    The one-dimensional falling motion of a bungee chain suspended from a rigid support and of a chain falling from a resting heap on a table is studied. Their Lagrangians are found to contain no explicit time dependence. As a result, these falling chains are conservative systems. Each of their Lagrange's equations of motion is shown to contain a term that enforces energy conservation when masses are transferred between subchains. We show in particular that Cayley's 1857 energy nonconserving solution for a chain falling from a resting heap is incorrect because it neglects the energy gained when the transferred link is emitted by the emitting subchain. The maximum chain tension measured by Calkin and March for the falling bungee chain is given a simple if rough interpretation. In the simplified one-dimensional treatment, the kinetic energy of the center of mass of the falling bungee chain is found to be converted by the chain tension at the rigid support into the internal kinetic energy of the chain. However, as t...

  3. A New Application of Current Conveyors: The Design of Wideband Controllable Low-Noise Amplifiers

    Directory of Open Access Journals (Sweden)

    A. Fabre

    2008-12-01

    Full Text Available The aim of this paper is three-fold. First, it reviews the low-noise amplifier and its relevance in wireless communications receivers. Then it presents an exhaustive review of the existing topologies. Finally, it introduces a new class of LNAs, based on current conveyors, describing the founding principle and the performances of a new single-ended LNA. The new LNAs offer the following notable advantages: total absence of passive elements (and the smallest LNAs in their respective classes; wideband performance, with stable frequency responses from 0 to 3 GHz; easy gain control over wide ranges (0 to 20 dB. Comparisons with other topologies prove that the new class of LNA greatly advances the state of the art.

  4. STUDY ON THE CONTROL SYSTEM OF HYDRAULIC MOMENT-ADJUSTED BRAKE FOR DOWNWARD BELT CONVEYOR

    Institute of Scientific and Technical Information of China (English)

    孟国营; 徐志强; 霍森; 方佳雨

    1997-01-01

    Having analyzed the drawbacks on the design of control system of hydraulic momentadjusted brake system, the author presents a closed loop control system in the process of start and braking of the conveyer. On the basis of the concept of the critical time and the critical acceleration and its deductions, the working mode of the conveyer can be identified and controlled in feedback, furthermore, thus realize the process of soft start. In the deceleration process, the author points out the problems that exist in the present control system and sets forward the control process that acted by the combined function of brake moment of motor and the drag torque of hydraulic brake at the beginning of deceleration, it will further improved reliability of conveyor system.

  5. Reinforcing materials in conveyor belts: their requirements and developments; Verstaerkungsmaterialien in Foerdergurten: Tendenzen, Anforderungen und Entwicklungen

    Energy Technology Data Exchange (ETDEWEB)

    Kopmels, P. [Akzo Nobel Fibers, Arnhem (Netherlands)

    1994-12-31

    During this century one can observe a gradual change in the textile materials used to reinforce conveyor belt. In the beginning of the 20th century only cotton was used, then rayon came up followed by polyamide and polyester. Nowadays aramid is also used for special applications. These changes in textile reinforcing materials were driven by a better fulfilment of the existing technical requirements and/or a better price/performance ratio. In addition to the search for new polymers, the fiber producers try to improve the yarn properties of existing polymers. An example of a newly developed polyester type is presented. By raising the yarn strength and at the same time improving the efficiency of the yarn in respect to the necessary converting steps like twisting, weaving and dipping the price/performance ratio of this new yarn type has been greatly improved. 11 figs.

  6. FLUID-BASED SIMULATION APPROACH FOR HIGH VOLUME CONVEYOR TRANSPORTATION SYSTEMS

    Institute of Scientific and Technical Information of China (English)

    Ying WANG; Chen ZHOU

    2004-01-01

    High volume conveyor systems in distribution centers have very large footprint and can handle large volumes and hold thousands of items. Traditional discrete-event cell-based approach to simulate such networks becomes computationally challenging. An alternative approach, in which the traffic is represented by segments of fluid flow of different density instead of individual packages, is presented in this paper to address this challenge. The proposed fluid-based simulation approach is developed using a Hybrid Petri Nets framework. The underlying model is a combination of an extension of a Batches Petri Nets (BPN) and a Stochastic Petri Nets (SPN). The extensions are in the inclusion of random elements and relaxation of certain structural constraints. Some adaptations are also made to fit the target system modeling. The approach is presented with an example.

  7. Application of Inverter in Belt Conveyor Control%变频器在带式输送机上的控制应用

    Institute of Scientific and Technical Information of China (English)

    李芬

    2015-01-01

    The article describes the traditional driving way of belt conveyor ,focusing on the application of inverter in belt conveyor control ,and the advantages of the frequency control .%介绍了带式输送机的传统驱动方式,重点论述了变频器对带式输送机的控制,以及变频控制的优势。

  8. 螺旋输送装置的研究现状及未来发展%Present Situation and Future Development of Screw Conveyor

    Institute of Scientific and Technical Information of China (English)

    乌兰图雅; 王春光

    2014-01-01

    Screw conveyor becoming increasingly prevalent in a variety of industries , therefore it ’ s required higher per-formance .Study in screw conveyor is significant for implementing mechanization and automation of conveyors .This paper introduces the present situations of screw conveyors at home and abroad , elabrates the main problems in the development of the screw conveyors in our countries , and points out the development tendency , provides theory basis for the develop-ment of screw conveyors .%随着螺旋输送装置在多种行业中的应用日益扩大,对其性能要求也越来越高,因而对输送装置进行深入研究,对我国输送机械化和自动化具有现实意义。为此,对国内外螺旋输送装置的理论分析、设计制造及仿真研究进行综述,分析了目前螺旋输送装置存在的主要问题,探讨了今后研究方向。

  9. 输送带水冲洗系统的设计%Design of water flushing system for conveyor belt

    Institute of Scientific and Technical Information of China (English)

    张艳明

    2012-01-01

    针对带式输送机输送带回程段存在的粘料问题,采用水冲洗装置,解决了原刮料器刮不干净的问题.该系统实际运行效果良好,对输送机的维护具有一定的指导意义.%Aiming at the stuck material existing in the return section of conveyor belt, water flushing system is adopted in order to solve the problem that the original scraper fails to scrap it off totally. The system proves a great operation effect. This paper provides certain guidance to maintenance of the conveyor as well.

  10. A new conveyor system based on a passive magnetic levitation unit having repulsive-type magnetic bearings

    Science.gov (United States)

    Ohji, T.; Ichiyama, S.; Amei, K.; Sakui, M.; Yamada, S.

    2004-05-01

    A magnetic repulsive-type conveyor system is proposed as a new application of repulsive-type magnetic bearings, which use repulsive forces between the stator and rotor permanent magnets. The proposed conveyer is composed by aligning many passive magnetic levitation units. Each unit also contains electromagnets to oscillate a levitator shaft in the radial direction. The way of generating vibration and rotation in the conveyance direction was examined by the various excitation methods.

  11. Determination of Effective Factors on Power Requirement and Conveying Capacity of a Screw Conveyor under Three Paddy Grain Varieties

    Directory of Open Access Journals (Sweden)

    Ezzatollah Askari Asli-Ardeh

    2012-01-01

    Full Text Available An experiment was conducted to investigate the effect of screw speed, inclination angle and variety on the required power, and conveying capacity of a screw conveyor. The experiment was designed with four levels of screw speed (600, 800, 1000, and 1200 rpm, five levels of inclination angle (0, 20, 40, 60, and 80∘, and three levels of variety (Alikazemi, Hashemi, and Khazar. The Length, diameter, and pitch of screw were 2, 0.78, and 0.5 m, respectively. The experimental design was a randomized complete block (RCB with factorial layout. Maximum and minimum power requirements of tested screw conveyor were 99.29 and 81.16 Watt corresponding to conveying capacity of 3.210 and 1.975 ton/hour obtained for khazar and Alikazemi varieties, respectively. The results indicated that as screw inclination angle increased from 0 to 80∘, the conveying capacity decreased significantly from 3.581 to 0.932 t/h. It can be concluded that the most conveying capacity was 4.955 t/h at tests with khazar variety and conveyor inclination angle zero degree.

  12. Determination of effective factors on power requirement and conveying capacity of a screw conveyor under three paddy grain varieties.

    Science.gov (United States)

    Askari Asli-Ardeh, Ezzatollah; Mohsenimanesh, Ahmad

    2012-01-01

    An experiment was conducted to investigate the effect of screw speed, inclination angle and variety on the required power, and conveying capacity of a screw conveyor. The experiment was designed with four levels of screw speed (600, 800, 1000, and 1200 rpm), five levels of inclination angle (0, 20, 40, 60, and 80°), and three levels of variety (Alikazemi, Hashemi, and Khazar). The Length, diameter, and pitch of screw were 2, 0.78, and 0.5 m, respectively. The experimental design was a randomized complete block (RCB) with factorial layout. Maximum and minimum power requirements of tested screw conveyor were 99.29 and 81.16 Watt corresponding to conveying capacity of 3.210 and 1.975 ton/hour obtained for khazar and Alikazemi varieties, respectively. The results indicated that as screw inclination angle increased from 0 to 80°, the conveying capacity decreased significantly from 3.581 to 0.932 t/h. It can be concluded that the most conveying capacity was 4.955 t/h at tests with khazar variety and conveyor inclination angle zero degree.

  13. Chain Gang

    Science.gov (United States)

    2006-01-01

    6 August 2006 This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows a chain of clustered and battered craters. These were formed by secondary impact. That is, somewhere to the south (beyond the bottom of this image), a large impact crater formed. When this occurred, material ejected from the crater was thrown tens to hundreds of kilometers away. This material then impacted the martian surface, forming clusters and chains of smaller craters. Location near: 15.8oN, 35.6oW Image width: 3 km (1.9 mi) Illumination from: upper left Season: Northern Spring

  14. Optimation of a Table Conveyor Type Grading Machine to Increase the Performance of Green Coffee Manual Sortation

    Directory of Open Access Journals (Sweden)

    Sukrisno Widyotomo

    2006-05-01

    Full Text Available Coffee consumers request a good quality of green coffee to get a good coffee cup taste. Defective beans e.g. black bean, brown bean and broken bean are associated to low coffee quality which give negative effects to final taste. To meet the standard export requirement, coffee beans have to be graded before being traded. Until now, grading process is generally carried out manually. The method gives better product, so the grading cost is very expensive about 40% of total processing cost. Meanwhile, shortage of skill workers is a limiting factor of the process. Therefore, improving the manual sorting by providing machine for grading of green coffee is good alternative to reduce the grading cost. Indonesian Coffee and Cocoa Research Institute has designed a table conveyor type grading machine in order to improve the performance of the manual grading productivity and consistent quality and to reduce the grading cost. The conveyor belt has a dimension of 5700 mm of length, 610 mm of width and 6 mm of thickness. The rotating of belt conveyor powered by an electro motor 3 HP, 3 phase and 1420 rpm. The result showed that the optimum capacity of grading machine was 390 kg/hour reached when the speed 16 rpm and 3 kg/m 2 of green beans on belt conveyor with productivity 1870 kg/man-day compared to the productivity full manually process 743 kg/man-day. Percentage of product in outlet 1 was 4.2% as broken beans, 0.26% as brown beans, 0.68% as one hole in beans and 0.61% as more than one hole in beans. Percentage of product in outlet 2 was 39.54% as broken beans, 4.23% as brown beans 7.19% as black beans, 4.47% as one hole in beans and 4.43% as more than one hole in beans. Cost of grading process per kg of green coffee is Rp20,-. Key words : Coffee, Grading, Conveyor table, Quality

  15. Long distance kelp rafting impacts seaweed biogeography in the Northeast Pacific: the kelp conveyor hypothesis.

    Science.gov (United States)

    Saunders, Gary W

    2014-12-01

    Routine DNA barcoding of the Haida Gwaii seaweed flora revealed "endemic species" attributed initially to this region's past as a glacial refugium. However, subsequent barcode records from central California rapidly eroded this list leaving species characterized by disjunct distributions (DD) between California and Haida Gwaii. This observation prompted a more detailed look at species for California and British Columbia and revealed that 33 of 180 DNA-barcoded genetic groups in common between these regions (~18%) predominantly displayed DD between California and northern British Columbia. A previous discovery that a red abalone shell found in Haida Gwaii (far north of its range) had a float-bearing kelp (Nereocystis luetkeana) holdfast attached to it prompted a closer consideration of the COI-5P barcode data in support of a "kelp conveyor hypothesis." The hypothesis posits that there has been a net migration of Californian species to northern British Columbia the vector being species growing on substrata carried along with kelp rafts on the winter Davidson Current.

  16. The conveyor belt hypothesis for thymocyte migration: participation of adhesion and de-adhesion molecules

    Directory of Open Access Journals (Sweden)

    Villa-Verde D.M.S.

    1999-01-01

    Full Text Available Thymocyte differentiation is the process by which bone marrow-derived precursors enter the thymus, proliferate, rearrange the genes and express the corresponding T cell receptors, and undergo positive and/or negative selection, ultimately yielding mature T cells that will represent the so-called T cell repertoire. This process occurs in the context of cell migration, whose cellular and molecular basis is still poorly understood. Kinetic studies favor the idea that these cells leave the organ in an ordered pattern, as if they were moving on a conveyor belt. We have recently proposed that extracellular matrix glycoproteins, such as fibronectin, laminin and type IV collagen, among others, produced by non-lymphoid cells both in the cortex and in the medulla, would constitute a macromolecular arrangement allowing differentiating thymocytes to migrate. Here we discuss the participation of both molecules with adhesive and de-adhesive properties in the intrathymic T cell migration. Functional experiments demonstrated that galectin-3, a soluble ß-galactoside-binding lectin secreted by thymic microenvironmental cells, is a likely candidate for de-adhesion proteins by decreasing thymocyte interaction with the thymic microenvironment.

  17. Hydraulic engines in armoured conveyors; Motores hidraulicos en los transportadores blindados

    Energy Technology Data Exchange (ETDEWEB)

    Fernandez Fernandez, N.; Fernandez Equibar, J.L. [Hullera Vasco-Leones, S.A., Leon (Spain)

    1994-05-01

    The Sociedad Anonima Hullera Vasco-Leonesa (HVL) coal mining company in Spain is exploiting a deposit of large subvertical seams which are characterised by being highly tectonised. A very important part of the work of exploitation is developed in the depths of the mine with the aid of secondary ventilation. In the near future, which will characterise itself with the opening of the `New Mine`, this type of work will come to have a significant relevance in underground mining technology. The limitations of space and the presence of methane necessitate, as for many years, the use of pneumatic moving shields, with the great inconveniences which derive from them: reduced energy efficiency, and elevated production of dust and noise. For this HVL seek to introduce in a conventional working, at the bottom of the mine, a system of armoured conveyors driven by hydraulic units, which besides reducing and/or eliminating the problems referred to above serve, as in the past, to extend hydraulic energy into other parts of mining activity. In order to initiate the proposed investigation a pilot project will be partially financed by Ocicarbon. 5 figs.

  18. Low-Voltage Ultra-Low-Power Current Conveyor Based on Quasi-Floating Gate Transistors

    Directory of Open Access Journals (Sweden)

    F. Khateb

    2012-06-01

    Full Text Available The field of low-voltage low-power CMOS technology has grown rapidly in recent years; it is an essential prerequisite particularly for portable electronic equipment and implantable medical devices due to its influence on battery lifetime. Recently, significant improvements in implementing circuits working in the low-voltage low-power area have been achieved, but circuit designers face severe challenges when trying to improve or even maintain the circuit performance with reduced supply voltage. In this paper, a low-voltage ultra-low-power current conveyor second generation CCII based on quasi-floating gate transistors is presented. The proposed circuit operates at a very low supply voltage of only ±0.4 V with rail-to-rail voltage swing capability and a total quiescent power consumption of mere 9.5 µW. Further, the proposed circuit is not only able to process the AC signal as it's usual at quasi-floating gate transistors but also the DC which extends the applicability of the proposed circuit. In conclusion, an application example of the current-mode quadrature oscillator is presented. PSpice simulation results using the 0.18 µm TSMC CMOS technology are included to confirm the attractive properties of the proposed circuit.

  19. An Integrated MCDM Model for Conveyor Equipment Evaluation and Selection in an FMC Based on a Fuzzy AHP and Fuzzy ARAS in the Presence of Vagueness.

    Science.gov (United States)

    Nguyen, Huu-Tho; Dawal, Siti Zawiah Md; Nukman, Yusoff; Rifai, Achmad P; Aoyama, Hideki

    2016-01-01

    The conveyor system plays a vital role in improving the performance of flexible manufacturing cells (FMCs). The conveyor selection problem involves the evaluation of a set of potential alternatives based on qualitative and quantitative criteria. This paper presents an integrated multi-criteria decision making (MCDM) model of a fuzzy AHP (analytic hierarchy process) and fuzzy ARAS (additive ratio assessment) for conveyor evaluation and selection. In this model, linguistic terms represented as triangular fuzzy numbers are used to quantify experts' uncertain assessments of alternatives with respect to the criteria. The fuzzy set is then integrated into the AHP to determine the weights of the criteria. Finally, a fuzzy ARAS is used to calculate the weights of the alternatives. To demonstrate the effectiveness of the proposed model, a case study is performed of a practical example, and the results obtained demonstrate practical potential for the implementation of FMCs.

  20. 砷料送料机的螺旋输送机的设计%Design of Screw Conveyor in Arsenic Materials Feeder

    Institute of Scientific and Technical Information of China (English)

    刘涛; 陈秋月; 朱磊; 刘铁

    2014-01-01

    To meet the accurate feeding requirement of arsenic material feeder ,a screw conveyor is designed .The structure design and calculation of the screw conveyor under this working condition is introduced ,the transmission system of the device is described in detail .This screw conveyor can garantee the arsenic material's accurate feeding and improves the efficiency of equipment .%为满足砷料送料机工作的要求,采用螺旋输送机构进行精确送料,对此工况下所要求的螺旋输送机结构进行设计与计算,对其驱动装置做了深入设计,保证了砷料的精确送料,提高了设备的生产效率。

  1. 带式输送机托辊的参数化设计%Parametric design on belt conveyor roller

    Institute of Scientific and Technical Information of China (English)

    冷岳峰

    2013-01-01

    To solve parametric drawing problem of belt conveyor roller design,uses inlays language VBA principle and method to achieves the parametric design process of the belt conveyor roller components. uses inlays language VBA to writing drawing program,using this application,designers can input the corresponding parameters to get the result of roller drawing to get belt conveyor roller drawings and assembly drawings and other drawing results.The parametric design method reducts design cycle to some kinds of components, reduce the designer’s drawing labour intensity ,and enhances the drawing quality and efficiency.%  为解决带式输送机托辊设计中的参数化绘图问题,采用 VBA 对带式输送机托辊进行参数化设计的原理和方法,实现在 AutoCAD2004环境下,利用 AutoCAD 自带的二次开发软件包 VBA 编制绘图程序,利用此应用程序,设计人员只需输入几个相应的设计参数就可得到托辊完整的零件图和装配图等绘图结果。这种参数化设计方法不仅缩短了对某类零件的设计周期,减轻设计人员绘图劳动强度,同时还提高设计的质量和效率。

  2. The interaction between warm conveyor belts and breaking Rossby waves: a climatological perspective.

    Science.gov (United States)

    Madonna, Erica; Joos, Hanna; Martius, Olivia; Aebi, Christine; Limbach, Sebastian

    2014-05-01

    Warm conveyor belts (WCBs) are moist ascending airstreams in extratropical cyclones. Climatologically, they are key for the meridional and vertical transport of water vapour and heat. The rapid ascent of WCBs from the boundary layer to the upper troposphere in about 1-2 days leads to cloud formation, (intense) precipitation and the release of latent heat, which modifies their potential vorticity (PV) value in a significant way. Typically WCBs reach the tropopause level with low PV values (~0.5 pvu) and therefore the cross-isentropic transport of low-PV air in WCBs can amplify upper-level Rossby waves and contribute to the formation of PV streamers downstream. Here, filamentary PV streamers are regarded as clear signs of breaking Rossby waves. They in turn can act as precursors of extreme weather events and/or trigger the genesis of another cyclone, potentially generating a new WCB. The aim of this study is to quantify the interaction of WCBs and PV-streamers from a climatological point of view for the ERA-Interim data set for the period 1989-2010. WCBs are identified from comprehensive trajectory calculations that select air parcels in the vicinity of cyclones with a minimum ascent of 600 hPa in 48 hours. From these WCB trajectories, coherent features of WCB outflows are derived and checked for overlapping with PV streamers, which are identified using a contour searching algorithm. Both, WCBs and PV-streamers are then tracked using a novel feature tracking technique, which is based upon a modified region growing approach. With this technique, the interaction of WCBs and PV-streamers is analysed for a 22-years period leading to novel insight about the role of WCBs for triggering the breaking of Rossby waves, as well as, vice versa, about the importance of PV-streamers for the formation of new WCBs.

  3. Performance of a convective, infrared and combined infrared- convective heated conveyor-belt dryer.

    Science.gov (United States)

    El-Mesery, Hany S; Mwithiga, Gikuru

    2015-05-01

    A conveyor-belt dryer was developed using a combined infrared and hot air heating system that can be used in the drying of fruits and vegetables. The drying system having two chambers was fitted with infrared radiation heaters and through-flow hot air was provided from a convective heating system. The system was designed to operate under either infrared radiation and cold air (IR-CA) settings of 2000 W/m(2) with forced ambient air at 30 °C and air flow of 0.6 m/s or combined infrared and hot air convection (IR-HA) dryer setting with infrared intensity set at 2000 W/m(2) and hot at 60 °C being blown through the dryer at a velocity of 0.6 m/s or hot air convection (HA) at an air temperature of 60 °C and air flow velocity 0.6 m/s but without infrared heating. Apple slices dried under the different dryer settings were evaluated for quality and energy requirements. It was found that drying of apple (Golden Delicious) slices took place in the falling rate drying period and no constant rate period of drying was observed under any of the test conditions. The IR-HA setting was 57.5 and 39.1 % faster than IR-CA and HA setting, respectively. Specific energy consumption was lower and thermal efficiency was higher for the IR-HA setting when compared to both IR-CA and HA settings. The rehydration ratio, shrinkage and colour properties of apples dried under IR-HA conditions were better than for either IR-CA or HA.

  4. DELTA机器人传送带与视觉的综合标定方法%Method of Integrated Calibration on DELTA Robot Conveyor and Vision

    Institute of Scientific and Technical Information of China (English)

    杨强; 刘冠峰

    2015-01-01

    In this paper we propose an method of integrated calibration on DELTA robot conveyor and vision. We first use the end of DELTA robot arm to touch the same point on the conveyor when the conveyor moves some distance,which allows us to obtain the value of the point’s location in the robot coordinate system and the corresponding value of the encoder.,then we get the scale factor of the robot and conveyor,determine the transformation matrix between the robot coordinate system and the conveyor coordinate system, then we can know the pose of the conveyor coordinate system relative to the coordinate system of the robot,which is the conveyor calibration. By using the camera to posit in contact with the robot at the same point, we obtain the intrinsic matrix and the external parameters matrix of the camera, which can know the transformation matrix between the robot coordinate system and the camera coordinate system, which is the robot vision calibration. DELTA robot conveyor and vision calibration will make the foundation of achieving DELTA robot high-precision control.%提出一种关于DELTA机器人传送带与视觉的综合标定方法。通过DELTA机器人臂末端在传送带移动一段距离接触传送带始末同一点,得到该点在机器人坐标系的位置和编码器上对应的读数,得到传送带与机器人的比例因子,确定机器人坐标系与传送带坐标系的转化矩阵,从而得到传动带相对于机器人坐标系的位姿,即传送带的标定。通过相机定位与机器人接触同一点,从而确定相机的内参矩阵与外参矩阵,从而得到机器人与相机坐标系的转换关系,即机器人视觉的标定。DELTA机器人传送带与视觉的标定,为DELTA机器人高精度控制的实现打下基础。

  5. Persistence of Salmonella on egg conveyor belts is dependent on the belt type but not on the rdar morphotype.

    Science.gov (United States)

    Stocki, S L; Annett, C B; Sibley, C D; McLaws, M; Checkley, S L; Singh, N; Surette, M G; White, A P

    2007-11-01

    Commercial caged layer flocks in Alberta, Canada, are commonly monitored for Salmonella enterica serovar Enteritidis (SE) and S. enterica serovar Typhimurium (ST) by environmental sampling. In one recent case, a SE strain isolated from the egg conveyor belt was a source of persistent infection for the flock. This study was undertaken to examine Salmonella colonization on egg conveyor belts and to determine whether the rdar morphotype, a conserved physiology associated with aggregation and long-term survival, contributed to persistence. Four woven belts constructed of natural or nonnatural fibers and a 1-piece belt made of vinyl were tested with rdar-positive ST and SE strains and a rdar-negative ST DeltaagfD reference strain. The type of egg belt was the most important factor influencing Salmonella colonization and persistence. The vinyl belt, with the least surface area available for colonization, had the fewest Salmonella remaining after washing and disinfection, whereas the hemp-plastic belt, with the greatest surface area, had the most Salmonella remaining. Real-time gene expression indicated that the rdar morphotype was involved in colonizing the egg belt pieces; however, it was not essential for persistence. In addition, rdar-positive and rdar-negative strains were equally similarly to disinfection on the egg belt pieces. The results indicate that Salmonella can persist on a variety of egg belts by mechanisms other than the rdar morphotype, and that using egg conveyer belts with reduced surface area for bacterial colonization can lessen contamination problems.

  6. Comparison of Several Conveyor Soft-Starters%几种输送机软起动装置的比较

    Institute of Scientific and Technical Information of China (English)

    宋恩泽

    2012-01-01

    指出矿用刮板输送机及胶带输送机存在的突出问题是难起动、机头机尾负载不均衡及过载保护装置不可靠。介绍离心离合器、可控液黏离合器及可控行星差速减速器的工作原理、结构和性能特点,及各自的适用范围。%Points out the troublesome problems of scraper and belt conveyors are difficuh start, unbalanced distribution of load over electro-motors on the head and tail of conveyor, and poor reliability of overload protection device. Introduces the working principle, structure, performance and application scope of several soft-starters, such as centrifugal clutch, controlled fluid sticky clutch and controlled planetary differential-speed gear, and makes a comparison among them.

  7. Technical transformation of screw conveyors for PVC drying system%PVC 干燥系统螺旋输送器的技术改造

    Institute of Scientific and Technical Information of China (English)

    陈六娟; 张军锋

    2013-01-01

    介绍了PVC旋流干燥工艺中螺旋输送器存在的问题以及改造措施。%Problems existed in the crew conveyors for the cyclone drying process of PVC were in-troduced as well as technical transform measures.

  8. Calculation and Selection of Driving Power Belt Conveyor in Mineral Processing Plant%选矿厂带式输送机驱动功率的计算及选取

    Institute of Scientific and Technical Information of China (English)

    杨高天

    2014-01-01

    依选矿厂带式输送机特点,简化带式输送机驱动功率计算公式,并依据选矿工艺,选取带式输送机驱动电机功率。%according to the characteristics of the belt conveyor of mineral processing plant , simplified formula of belt con-veyor driving power , and on the basis of ore dressing process , selection of belt conveyor drive motor power .

  9. Characteristic analysis on screw conveyor used for lignite molding%褐煤成型用螺旋输送机的特性分析

    Institute of Scientific and Technical Information of China (English)

    郝兵; 崔郎郎; 李聪杰; 白爱民; 蒋惠民; 刘正魁; 高洁

    2013-01-01

    根据褐煤成型机用螺旋输送机的工作特点,通过对螺旋轴结构进行分析及试验研究,确定一种合理的螺旋结构.通过试验数据得出螺旋输送机输送能力受煤粉的水分、温度和粒度的影响.物料水分增加,会增加螺旋输送机的功耗;物料水分下降,既能降低螺旋输送机功耗,又能提升成型机的成型压力.因此,合理设计螺旋输送机的结构,可为成型机运行参数的确定提供参考.%Based on the operating features of the screw conveyor used for lignite molding machine,after the structure of the screw shaft was analyzed and tested,a screw with reasonable structure was determined.Test data showed the influences of moisture,temperature and granularity of pulverized coal on the transportation capacity of the screw conveyor.The moisture raise led to increase in power consumption of the screw conveyor; the moisture reduction led to decrease in power consumption of the screw conveyor and increase in molding pressure of the molding machine.The screw conveyor with reasonable structure could offer foundation for determining the operating parameters of the molding machine.

  10. Graphs: Associated Markov Chains

    OpenAIRE

    2012-01-01

    In this research paper, weighted / unweighted, directed / undirected graphs are associated with interesting Discrete Time Markov Chains (DTMCs) as well as Continuous Time Markov Chains (CTMCs). The equilibrium / transient behaviour of such Markov chains is studied. Also entropy dynamics (Shannon entropy) of certain structured Markov chains is investigated. Finally certain structured graphs and the associated Markov chains are studied.

  11. Of Rock Damage and the Regolith Conveyor Belt: A Geomorphologist's View of the Critical Zone

    Science.gov (United States)

    Anderson, R. S.; Anderson, S. P.; Tucker, G. E.

    2011-12-01

    Models of hillslope evolution require rules for the rate of detachment of rock into the mobile regolith layer, for the rate of mobile regolith transport, and for channel incision or aggradation rates that serve as boundary conditions. The evolution of material as it passes through the weathered zone is typically ignored, making it difficult to cast proper rules for production of mobile regolith. The current rules are therefore insufficient to address critical zone evolution, in which the chemical, mechanical, and hydrologic properties of the rock and the regolith matter. These properties evolve as rock is weathered during exhumation, and they continue to evolve as particles ride the conveyor belt of mobile regolith downslope. Models that honor specific processes involved in the evolution of rock as it passes through the CZ will both advance models of landscape evolution, and provide context for ecological and hydrological investigations. Physical processes responsible for progressive damage of rock during exhumation in the current CZOs include frost cracking and tree root cracking. If we define damage as the density of flaws within the rock, we require rules governing the rate of generation of new flaws, which will vary with climate, depth, and the present state of damage. We envision a "damage-limited system" in which the likelihood of release of rock fragments into mobile regolith depends on the accumulated damage in the subjacent rock. In most temperate and alpine settings relevant to the present CZOs, the ratio of a rock's residence time in the damage zone to the duration of a climate oscillation is such that a rock parcel will experience the full spectrum of Quaternary climates. This requires that we address both climate history and the damage and transport rates associated with all Quaternary climates. We present numerical models for rock damage, mobile regolith production, and hillslope profile evolution. These models are motivated by the Boulder Creek CZO

  12. Role of the Bering Strait on the hysteresis of the ocean conveyor belt circulation and glacial climate stability.

    Science.gov (United States)

    Hu, Aixue; Meehl, Gerald A; Han, Weiqing; Timmermann, Axel; Otto-Bliesner, Bette; Liu, Zhengyu; Washington, Warren M; Large, William; Abe-Ouchi, Ayako; Kimoto, Masahide; Lambeck, Kurt; Wu, Bingyi

    2012-04-24

    Abrupt climate transitions, known as Dansgaard-Oeschger and Heinrich events, occurred frequently during the last glacial period, specifically from 80-11 thousand years before present, but were nearly absent during interglacial periods and the early stages of glacial periods, when major ice-sheets were still forming. Here we show, with a fully coupled state-of-the-art climate model, that closing the Bering Strait and preventing its throughflow between the Pacific and Arctic Oceans during the glacial period can lead to the emergence of stronger hysteresis behavior of the ocean conveyor belt circulation to create conditions that are conducive to triggering abrupt climate transitions. Hence, it is argued that even for greenhouse warming, abrupt climate transitions similar to those in the last glacial time are unlikely to occur as the Bering Strait remains open.

  13. A mathematical model and simulation of the drying process of thin layers of potatoes in a conveyor-belt dryer

    Directory of Open Access Journals (Sweden)

    Salemović Duško R.

    2015-01-01

    Full Text Available This paper presents a mathematical model and numerical analysis of the convective drying process of small particles of potatoes slowly moving through the flow of a drying agent - hot moist air. The drying process was analyzed in the form of a one-dimensional thin layer. The mathematical model of the drying process is a system of two ordinary nonlinear differential equations with constant coefficients and an equation with a transcendent character. The appropriate boundary conditions of the mathematical model were given. The presented model is suitable in the automated control. The presented system of differential equations was solved numerically. The analysis presented here and the obtained results could be useful in predicting the drying kinetics of potatoes and similar natural products in a conveyor-belt dryer. [Projekat Ministarstva nauke Republike, br. TR-33049, br. TR-37002 i br. TR-37008

  14. Voltage-Mode All-Pass Filters Using Universal Voltage Conveyor and MOSFET-Based Electronic Resistors

    Directory of Open Access Journals (Sweden)

    N. Herencsar

    2011-04-01

    Full Text Available The paper presents two novel realizations of voltage-mode first-order all-pass filters. Both circuits use single universal voltage conveyor (UVC, single capacitor, and two grounded resistors. Using the two NMOS transistors-based realizations of the electronic resistor with two symmetrical power supplies, presented all-pass filter circuits can be easily made electronically tunable. Proposed filter structures provide both inverting and non-inverting outputs at the same configuration simultaneously and they have high-input and low-output impedances that are desired for easy cascading in voltage-mode operations. The nonidealities of the proposed circuits are also analyzed and compared. The theoretical results of both circuits are verified by SPICE simulations using TSMC 0.35 μm CMOS process parameters. Based on the evaluation, the behavior of one of the circuits featuring better performance was also experimentally measured using the UVC-N1C 0520 integrated circuit.

  15. Design of Adaptive Control System of Belt Conveyor of Coal Mine Underground%井下胶带输送机自适应控制系统的设计

    Institute of Scientific and Technical Information of China (English)

    王瑾

    2011-01-01

    In view of problem of idle motion of belt conveyor existed in belt conveyor system of Wangzhuang Coal Mine, a design scheme of adaptive control system of belt conveyor of coal mine underground was proposed. Load current signals of four driving motors of present stage and pre-stage belt conveyors are collected by PLC and load of belt conveyor was forecasted dynamically after the signals are processed by control software, then control frequency signal is output according to the load, which controls frequency converter to drive belt conveyor with corresponding frequency, so as to make belt conveyor run with the best speed. The test result showed that the system can reduce no-load loss of belt conveyor obviously and save electric energy.%针对王庄煤矿胶带输送机系统存在胶带输送机无煤空转的问题,提出了一种井下胶带输送机自适应控制系统的设计方案.该系统由PLC采集本级和前级胶带输送机4台驱动电动机的负载电流信号,经控制软件处理,动态预测出胶带输送机的负荷大小,然后根据负荷大小输出控制频率信号,控制变频器以相应的频率驱动胶带输送机,使胶带输送机以最佳速度运行.试验结果表明,该系统明显减少了胶带输送机的空载损耗,节省了电能.

  16. Logistic chain modelling

    NARCIS (Netherlands)

    Slats, P.A.; Bhola, B.; Evers, J.J.M.; Dijkhuizen, G.

    1995-01-01

    Logistic chain modelling is very important in improving the overall performance of the total logistic chain. Logistic models provide support for a large range of applications, such as analysing bottlenecks, improving customer service, configuring new logistic chains and adapting existing chains to n

  17. Health supply chain management.

    Science.gov (United States)

    Zimmerman, Rolf; Gallagher, Pat

    2010-01-01

    This chapter gives an educational overview of: * The actual application of supply chain practice and disciplines required for service delivery improvement within the current health environment. * A rationale for the application of Supply Chain Management (SCM) approaches to the Health sector. * The tools and methods available for supply chain analysis and benchmarking. * Key supply chain success factors.

  18. 粮食输送设备密封的重要性及其分类%The important and classification of seal for food conveyors

    Institute of Scientific and Technical Information of China (English)

    赵显荣; 付忠华

    2014-01-01

    It is necessary to ensure good seal performance for food conveyors .this article introduces emphasize several common seal construction,for example,woolens seal、flexible filler seal、high molecule material seal and so on , and the development tendency of seal requirement in the food conveyors.%粮食输送设备具有良好的密封性能是很必要的,本文重点介绍了毛毡密封、软填料密封、高分子材料密封等几种常见的密封结构及粮食输送设备密封要求的发展趋势。

  19. 大容量物料存储输送中螺旋输送机的控制%Control of Large Capacity Storage Conveying Screw Conveyor

    Institute of Scientific and Technical Information of China (English)

    宋向前; 许胜; 沈春龙; 赵振江

    2015-01-01

    针对螺旋输送机在大容量物料输送过程中对超载敏感、易堵塞等问题,设计了大型料罐存储物料、以空气压缩泵及电动料罐阀为辅助动作、由螺旋输送机大容量输送的触摸屏控制系统。%In the process of screw conveyor in the bulk material on overload sensitive, blockage problem, the design of large tank storage material, with air compressor pump and electric tank valve action, assisted by a screw conveyor bulk transport of touch screen control system.

  20. 物料压缩率对长距离绞龙输送的影响%Effect of product compression ratio in the long transfer screw conveyor

    Institute of Scientific and Technical Information of China (English)

    崔斌; 孔震; 徐飞翔; 赵雪峰; 韩俊巍

    2013-01-01

    In this article we present the concepts of product compression ratio, and analyse the effect of product compression ratio in the long transfer screw conveyor, also give the solution for the jam which cause by the compression ratio in the long transfer screw conveyor.%文章提出了物料压缩率的概念,针对物料压缩率的特性对长距离绞龙的影响作出了分析,并且对长距离绞龙由于物料压缩率问题引起的堵料提出了解决方案。

  1. SimpleCalculation Method of Belt Conveyor Power%皮带机功率的简易计算方法

    Institute of Scientific and Technical Information of China (English)

    谷俊斐

    2013-01-01

    This article describes the arrangement of the belt conveyor , comes up with a simple method of belt conveyor pow-er by analyzing the drive roller structure .The calculation method is simple , easy to grasp and effective .%本文简要介绍了皮带机的布置形式,通过分析皮带机传动滚筒轴的组成结构,提出了皮带机传动滚筒轴功率的简易计算方法,该计算方法简单明了,易于掌握,为皮带机的设计提供了有效的参考方法。

  2. 螺旋输送钢球过程中的粒子夹卡问题%Particle clamping problem during delivery of steel particles by screw conveyor

    Institute of Scientific and Technical Information of China (English)

    崔海博; 赵惠清

    2012-01-01

    在粒子冲击钻井系统中,钢球高压螺旋输送机是关键装置之一.因钢球材质的特性及输送工况与常规螺旋输送机有着很大差异,进而所造成的钢球夹卡现象(严重时导致闷车)是不容忽视的问题.文中通过试验研究,找出了钢球在螺旋输送过程中极易夹卡的位置,分析了各种夹卡现象存在的原因,对螺旋输送机的结构进行了适应性改进.%The screw conveyor delivering steel particles material under high pressure is among key facilities of particle ?injection system used for the particle impact drilling. The steel particles would always be got stuck is a serious problem. Because the nature of steel particles and the working conditions of screw conveyor is different from conventional screw conveyor. This article finds out where it happens, analyzes the reason and finishes the structural improvement by experiment. The paper has researched influence.

  3. 半封闭螺旋输送机运动量及几何参数确定%Semi-enclosed Screw Conveyor Exercise and Geometric Parameters

    Institute of Scientific and Technical Information of China (English)

    李新; 薛风

    2013-01-01

      Based on the closed spiral conveyor within a single material as the research object, this paper carries on the analysis, obtains the granular material parameter design criterion and the formula for calculation and checking, providing the way for selecting and determining semi-enclosed screw conveyor operating parameters and geometric parameters, to be conduce to semi hermetic screw conveyor design and application.%  通过对半封闭螺旋输送机内单颗物料为研究对象进行分析,得出了输送散体物料过程中主要参数设计准则及其计算和校验公式,为半封闭螺旋输送机的工作参数和几何参数的选择和确定提供了方法,有助于半封闭螺旋输送机的设计和应用。

  4. New Conveyor Belt Lubrication Self-cleaning System%新型输送带润滑自清洁系统

    Institute of Scientific and Technical Information of China (English)

    王海兵; 许斌; 刘凤臣; 叶鹏

    2011-01-01

    In various types of beverage production line, conveyor belt plays an essential role. In order to prevent the bottle inverting, reducing wear, conveyor belt need to be lubricated. Lubrication by spraying is commonly used, but it exists kinds of problems such as non-uniform, waste, unfriendly-environment, breeding bacteria, scaling, and plugin noggle easily, difficult to clean and so on. Through comparative analysis, the paper proposed a new conveyor belt lubrication selfcleaning system with several advantages such as cycling lubrication, cleanness and asepsis, friendly environment conservation and maintenance fiee.[Ch,5 fig.1 tab.9 ref.]%在各类饮料生产线中,输送带起着不可或缺的作用.为了防止倒瓶、减少输送带自身的磨损,需对输送带进行润滑.通常采用的传统喷洒式润滑方法,在实际使用中存在润滑不均匀、浪费大、不环保、易长菌、易结垢、难清洁、喷嘴易堵塞等问题.通过对比分析,研制出一种新型的输送带滑润自清洁系统,具有循环润滑、清洁无菌、节约环保、免维护的优点.

  5. Sustainable Supply Chain Design

    DEFF Research Database (Denmark)

    Bals, Lydia; Tate, Wendy

    to implement TBL goals across the supply chain. In supply chain design, the classic economic perspective still dominates, although the idea of the TBL is more widely disseminated. The purpose of this research is to add to the sustainable supply chain management literature (SSCM) research agenda......A significant conceptual and practical challenge is how to integrate triple bottom line (TBL; including economic, social and environmental) sustainability into global supply chains. Although this integration is necessary to slow down global resource depletion, understanding is limited of how...... by incorporating the physical chain, and the (information and financial) support chains into supply chain design. This manuscript tackles issues of what the chains are designed for and how they are designed structurally. Four sustainable businesses are used as illustrative case examples of innovative supply chain...

  6. Experiment on asphalt mixture segregation in screw conveyor%沥青混合料在螺旋处的离析试验

    Institute of Scientific and Technical Information of China (English)

    谢立扬; 张晨光; 赵利军

    2013-01-01

    In order to exactly find out segregation reasons and segregation distribution regularities of asphalt mixture in screw conveyor during the paving process,based on the kinetic characteristics of mixture,this paper analyzed the relationship between the particles' axial and circumferential velocity and radius,pitch,rotational speed and friction coefficient under the action of screw conveyor.Meanwhile,field tests were conducted to get the segregation distribution regularities of asphalt mixture in screw conveyor.The results indicate that the mixture segregation is mainly affected by the spiral structure and the kinetic parameters.With the increase of radius,the particles' axial velocity monotonically increases,the circumferential velocity increases first and then decreases and the circumferential velocity is approximately equal to the axial velocity in the primary working range (radius 14~21 cm).So the segregation can be restricted by changing the rotational speed of screw conveyor and the relative position of screw conveyor and asphalt mixture.The asphalt content in the upper part of the screw is 2% higher than that in the bottom,the asphalt content in the central part of the screw is 0.7 % higher than that in both sides,the deviation of asphalt mixture gradation is in the specified range,but the asphalt mixture in the upper part of the screw contains more fine aggregate.Using the method of completely burying the crew conveyor,we can solve the asphalt content segregation occurring in the crew suspension.But the segregation between the upper and the lower part of the crew conveyor still exists.2 tabs,9 figs,11 refs.%为准确掌握摊铺过程中沥青混合料在螺旋分科器中的离析原因及分布规律,基于混合料在螺旋内的运动特性,分析了螺旋作用下混合料颗粒的轴向速度及圆周速度与螺旋半径、节距、转速及摩擦因数之间的关系,并通过现场试验给出了混合料离析在螺旋中的分布规律.结果

  7. The Global Value Chain

    DEFF Research Database (Denmark)

    Sørensen, Olav Jull

    The conference paper aims to develop the global value chain concept by including corporate internal value adding activities and competition to the basic framework in order to turn the global value chain into a strategic management tool......The conference paper aims to develop the global value chain concept by including corporate internal value adding activities and competition to the basic framework in order to turn the global value chain into a strategic management tool...

  8. Serum Free Light Chains

    Science.gov (United States)

    ... or of one of its component parts – a kappa or lambda light chain, or rarely, a heavy chain. Traditionally, plasma cell ... protein (M-protein) production and to calculate a kappa/lambda free light chain ratio. If the protein electrophoresis test is abnormal, ...

  9. 一种电动辊道输送车%One Type of Electric Roller Conveyor Truck

    Institute of Scientific and Technical Information of China (English)

    祝洲杰; 吴锂力

    2015-01-01

    Based on the accurate judgment of warehousing market and combined with the actual needs of customers,designed a new type of electric roller conveyor truck. This paper introduces the technical characteristics and performance characteristics of this truck , elaborates the structure. This truck provides a good solution to solve the actual problems in some working conditions.%通过对仓储物流细分市场的准确判断,结合客户的实际需求,研制了全电动辊道输送车。本文介绍了该车型的主要技术特点和性能特点,详细阐述了其结构实现方式和工作原理。该车型为解决某些工况环境下的实际问题提供了良好的解决方案。

  10. 螺旋输送机螺旋体优化设计%Optimization Design of Screw in Screw Conveyor

    Institute of Scientific and Technical Information of China (English)

    王铁流; 郭晓梅; 陈仙明

    2012-01-01

    The process of finite element analysis and optimization design of screw for screw conveyor with the Pro/Engineer is discussed, the main steps and methods are also introduced. Subject to the requirements of the structural parameters and design objectives, the optimal design is realized efficiently and rapidly. A practical method is improved for the design quality of screw.%应用Pro/Engineer软件,研究了螺旋输送机螺旋体的有限元分析和优化设计方法和过程,介绍了设计过程的主要步骤和方法.在满足结构参数和设计目标要求的前提下,快捷、有效地实现了优化设计,提高了设计质量,为螺旋体的设计提供了一种有效的方法.

  11. Occupational exposure to rubber vulcanization products during repair of rubber conveyor belts in a brown coal mine

    Energy Technology Data Exchange (ETDEWEB)

    Gromiec, J.P.; Wesolowski, W.; Brzeznicki, S.; Wroblewska-Jakubowska, K.; Kucharska, M. [Nofer Institute of Occupational Medicine, Lodz (Poland)

    2002-12-01

    This study was carried out to identify chemical substances and measure their air concentrations in the repair shop of a brown coal mine in which damaged rubber conveyor belts were repaired. GC-MS and HPLC analysis of stationary air samples resulted in identification of aliphatic and aromatic hydrocarbons to C{sub 12}, PAHs, alcohols, phenols, ketones, heterocyclic nitrogen and sulfur compounds. Quantitative evaluation of occupational exposure included determination of organic compound vapours collected on charcoal (GC-MSD), polycyclic aromatic hydrocarbons (HPLC), N-nitrosoamines and other amines (GC-NPD) and DNPH derivatives of aldehydes (HPLC) in the breathing zone of workers representing all job titles. The concentrations of investigated compounds were very low. Carcinogenic substances: N-nitrosoamines, benzene, and PAHs were not present in workroom air in concentrations exceeding limits of detection of the analytical methods being applied; concentrations of methylisobutylketone, tetrachloroethylene, naphtha, aromatic hydrocarbons, phthalates and aldehydes were much lower than the respective occupational exposure limit values. The results indicate much lower exposure than that reported in the production of tyres and other fabricated rubber products.

  12. Standardized components for belt conveyor drives - a design to cost concept; Standardkomponenten fuer Gurtfoerderantriebe - ein kostenguenstiges Konzept

    Energy Technology Data Exchange (ETDEWEB)

    Raphael, E. [A. Friedr. Flender AG, Bocholt (Germany)

    1997-11-01

    The technical progress in material and manufacture allowed an enormous size reduction of mechanical belt drives during the 70s and 80s of this century. Further cost reduction with no change in product quality were achieved by a standardized drive component concept providing all features needed for conveyor drives. There are a lot of details that need to be discussed. To be consequent, service factors of gearing, service life of bearings and thermal stability of the drive have to be redefined. Standardized seal systems help to prevent oil leakages and damages from environmental dust. Examples show that this concept is reliable in heavy duty service conditions of mining applications. (orig.) [Deutsch] Im Bereich der mechanischen Antriebe von Gurtfoerderern haben sich im Verlauf des letzten Jahrzehnts erhebliche technische oder logistische Veraenderungen vollzogen, die die Anschaffungs- und Betriebskosten der Antriebe senken helfen. Nach technischen Quantenspruengen in den Jahren 1970-1990 sind in diesem Jahrzehnt Systeme standardisierter Antriebskomponenten entstanden, welche fuer nahezu alle denkbaren Faelle die bedarfsgerechte Auswahl eines Gurtfoerdererantriebes gestatten. (orig.)

  13. Noninvasive radioelectric asymmetric conveyor brain stimulation treatment improves balance in individuals over 65 suffering from neurological diseases: pilot study

    Directory of Open Access Journals (Sweden)

    Margotti ML

    2012-02-01

    Full Text Available Vania Fontani1, Salvatore Rinaldi1, Alessandro Castagna1, Matteo Lotti Margotti21Department of Neuro Psycho Physio Pathology, Rinaldi Fontani Institute, Florence, Italy; 2Department of Information Technology and Statistical Analysis, Rinaldi Fontani Institute, Florence, ItalyPurpose: In the elderly population, problems with walking and balance are very common. These problems seriously affect the quality of life of the elderly. When gait and balance problems are caused by neurological disease, these problems can be more serious and difficult to handle. The aim of this pilot study was to verify the effect of a noninvasive radioelectric conveyor asymmetric brain stimulation protocol, named neuropostural optimization (NPO, to improve balance in neurological elderly.Patients and methods: Twelve patients suffering from various neurological diseases participated in this study. They were assessed with the Romberg test, which was performed on a computerized stabilometric platform before, immediately following, and 72 hours after NPO was used to improve balance.Results: The results showed that a stabilization of balance was recorded in all subjects a few minutes after administration of NPO. This stabilization increased 72 hours after treatment.Conclusion: The results show that NPO could be a valuable therapeutic approach to improve sensory-motor strategies and neurological control of balance in elderly patients suffering from various neurological diseases.Keywords: Romberg test, instability, imbalance, gait, REAC, neuropostural optimization

  14. Gushing metal chain

    Science.gov (United States)

    Belyaev, Alexander; Sukhanov, Alexander; Tsvetkov, Alexander

    2016-03-01

    This article addresses the problem in which a chain falls from a glass from some height. This phenomenon demonstrates a paradoxical rise of the chain over the glass. To explain this effect, an initial hypothesis and an appropriate theory are proposed for calculating the steady fall parameters of the chain. For this purpose, the modified Cayley's problem of falling chain given its rise due to the centrifugal force of upward inertia is solved. Results show that the lift caused by an increase in linear density at the part of chain where it is being bent (the upper part) is due to the convergence of the chain balls to one another. The experiments confirm the obtained estimates of the lifting chain.

  15. Conveyor Cultivation of the Halophytic Plant Salicornia europaea for the Recycling of NaCl from Human Liquid Waste in a Biological Life Support System.

    Science.gov (United States)

    Balnokin, Yurii; Myasoedov, Nikolay; Popova, Larissa; Tikhomirov, Alexander A.; Ushakova, Sofya; Tikhomirova, Natalia; Lasseur, Christophe; Gros, Jean-Bernard

    One problem in designing bioregenerative life support systems (BLSS) is developing technolo-gies to include human liquid and solid waste in intrasystem recycling. A specific task is recycling of NaCl excreted in urine by humans. We showed recently that this could be achieved through inclusion of the salt accumulating halophyte Salicornia europaea in the autotrophic compart-ment of the BLSS (Balnokin et al., ASR, 2010, in press). A model of NaCl circulation in BLSS with inclusion of S. europaea was based on the NaCl turnover in the human -urine -nutrient solution -S. europaea -human cycle. Mineralized urine was used as a basis for preparation of a nutrient solution for the halophyte cultivation. The shoots of the halophyte cultivated in the mineralized urine and containing NaCl could to be used by the BLSS inhabitants in their diets. In this report we describe cultivation of S. europaea which allows turnover of NaCl and produces daily shoot biomass containing Na+ and Cl- in quantities approximately equal to those excreted in daily human urine. The plants were grown in water culture in a climatic chamber under controlled conditions. A solution simulating mineralized urine (SSMU) was used as a basis for preparation of a nutri-ent solution for S. europaea cultivation. For continuous biomass production, seedlings of S. europaea, germinated preliminary in moist sand, were being transferred to the nutrient solu-tion at regular intervals (every two days). Duration of the conveyor operation was 112 days. During the first 56 days, the seedlings were being planted in SSMU diluted by a factor of 1.5 (2/3 SSMU). The same solution was introduced into the growth vessels as volumes of growth medium decreased due to plant transpiration. Starting from the 56th day as conveyor operation was initiated, the plants were being harvested every two days; the solutions from the discharged vessels were mixed with the fresh SSMU and the mixture was introduced into all other growth vessels of

  16. Supply Chain Management og Supply Chain costing

    DEFF Research Database (Denmark)

    Nielsen, Steen; Mortensen, Ole

    2002-01-01

    Formålet med denne artikel er at belyse de muligheder som ligger i at integrere virksomhedens økonomiske styring med begrebet Supply Chain Management (SCM). Dette søges belyst ved først at beskrive den teoretiske ramme, hvori SCM indgår. Herefter analyseres begrebet Supply Chain Costing (SCC) som...... Århus. Et resultat er, at via begrebet Supply Chain Costing skabes der mulighed for at måle logistikkædens aktiviteter i kr./øre. Anvendelsen af denne information har også strategisk betydning for at kunne vælge kunde og leverandør. Ved hjælp af integrationen skabes der også helt nye mulighed...

  17. Understanding the Chain Fountain

    CERN Document Server

    Biggins, John Simeon

    2013-01-01

    If a chain is initially at rest in a beaker at a height h1 above the ground, and the end of the chain is pulled over the rim of the beaker and down towards the ground and then released, the chain will spontaneously "flow" out of the beaker under gravity. Furthermore, if h1 is sufficient, the beads do not simply drag over the edge of the beaker but form a fountain reaching a height h2 above it. We show that the formation of a fountain requires that the beads come into motion not only by being pulled upwards by the part of the chain immediately above the pile, but also by being pushed upwards by an anomalous reaction force from the pile of stationary chain. We propose possible origins for this force, argue that its magnitude will be proportional to the square of the chain velocity, and predict and verify experimentally that h2 is proportional to h1.

  18. 大型带式输送机驱动能力校核计算%Calculation Method for Drive Capability of Large Belt Conveyor

    Institute of Scientific and Technical Information of China (English)

    张建军; 许宁; 赵炎

    2014-01-01

    With the development direction of long distance , large capacity and large angle of belt conveyor , the drive ability is becoming more important.If the drive ability can′t meet the needs of the actual use, the performance of the conveyor belt will greatly discount and cause great waste.A method of calculating the required motor power is introduced, according to the actual installation condition and performance requirements of the belt conveyor .The drive ability is checked whether meet the re-quirements by comparing with the total power of the motors.BH11-1 of Shenhua Huanghua Harbor, for example, the above calculation is verified.%随着带式输送机向长运距、大运载能力、大倾角的方向发展,对其驱动能力的要求也越来越高,如果驱动能力不能满足实际使用需要,输送带的性能将大打折扣,造成很大浪费。从驱动功率角度入手,详细介绍了一种根据带式输送机的实际安装条件和使用性能要求计算驱动电机所需功率的方法。将其与现场安装的电机总功率进行比较,验证驱动能力并以神华黄骅港务公司BH11-1皮带机为例,对上述计算进行了验证。

  19. 中驱软启动可伸缩带式输送机的应用%Application of Flexible Belt Conveyor with Soft Start of Intermediate Driver

    Institute of Scientific and Technical Information of China (English)

    张权

    2015-01-01

    采用中间驱动技术和电控系统对输送机实现自动监控及调节,首先要计算确定中间驱动系统的布置位置和各个驱动点受力分析,得到中间驱动技术可以降低输送带所受张力的结论,提高输送带使用寿命,同时可以降低输送带选型时的强度规格。其次,通过电控技术与调速型液力偶合器的配合,实现带式输送机的软启动控制和多机驱动功率平衡功能等自动化控制。最终得到大功率、大运量、长运距可伸缩带式输送机的设计方法。%Intermediate driving and electronic control system were used to realize the automatic monitoring and control for conveyors. First, we determined the position of the intermediate driving and conducted the force analysis for each driving point. We concluded that the intermediate driving technology could reduce belt tension, extend its service life, and reduce the strength specification. Second, by the matching between the electronic control system and variable speed fluid coupling, the soft start and power balance of multi-motor driving for the belt conveyor could be automatically controlled. Finally, we realized the design for the flexible belt conveyor, featured by high power, large transporting capacity, and long distance.

  20. 盾构螺旋输送机驱动密封故障处理与防护技术%Countermeasures for Malfunctions of Drive Sealing of Screw Conveyors of Shield Machines

    Institute of Scientific and Technical Information of China (English)

    吴朝来

    2012-01-01

    The causes for the malfunctions of the drive sealing of screw conveyors of shield machines, such as irrational screw conveyor design, inclining of screw rod, damage of contacting surface of the screw conveyor case, leaping forward of the screw rod and inadequate grease injection, are analyzed, and countermeasures, including screw conveyor structure optimization, ground conditioning, rationally selecting the screw conveyor speed, avoiding boring with empty chamber and controlling the manufacturing process, are proposed, with the practice in Chongqing as an example. The paper can provide reference for the coping with the malfunctions of the drive sealing of screw conveyors of shield machines in similar projects in the future.%为解决盾构螺旋机驱动密封故障问题,以重庆地区盾构施工情况为依托,结合多台盾构螺旋输送机驱动密封的修复经验,重点分析螺旋输送机驱动密封产生故障的原因:螺旋机设计不合理、螺旋机螺杆倾斜、筒体连接面磨损、螺杆向前蹿动、油脂注入量不足。总结出新的故障处理(螺旋机结构优化、渣土改良、合理选择螺旋机转速、防止空仓掘进、严控加工工艺等)与预防措施(螺旋机叶片修复、改善油脂注入量、更换损坏部件)。为今后盾构施工中处理螺旋输送机驱动密封故障处理与防护技术提供依据。

  1. 煤矿斜井隧道连续皮带机出渣系统选型配置∗%Selection and Configuration for Slag System of Continuous Belt Conveyor in Colliery Inclined Shaft Tunnel

    Institute of Scientific and Technical Information of China (English)

    韩兵

    2016-01-01

    According to the engineering characteristics of deep, long and continuous downhill of the Xinjie colliery inclined shaft, the engineering adaptability and the advantages and disadvantages of the common tunneling mucking methods were contrasted and analyzed, then aiming at the selection of continuous belt conveyor mucking method and the engineering condition, this paper analyzed the driving apparatus placement scheme of single belt conveyor and multi stage belt conveyor. Then based on the optimal scheme of the belt conveyor, the relationship between belt intensity and length of belt conveyor was analyzed, and it established four kinds of working conditions, and the calculation of the parameters of each working condition shows that the arrangement of belt conveyor working conditions is reasonable, all of which can ensure mucking smoothly in the Xinjie colliery inclined shaft engineering.%针对新街煤矿斜井隧道深埋、超长、连续下坡的工程特点,对比分析了常见隧道出渣方式的工程适应性及优缺点,并针对选定的连续皮带机出渣方式和工程条件,对单、多级皮带输送和输送机驱动装置布置方案进行了比较分析,基于优选的皮带机出渣方案,分析了皮带机带强与输送机长度的关系,制定了4种出渣工况,各工况参数计算表明皮带机工况制定合理,能保证新街煤矿斜井工程的顺利出渣。

  2. Food supply chains

    OpenAIRE

    Zhou, Qian

    2011-01-01

    The dissertation analyses food waste in global supply chain. From the related managerial literature, the process of supply chain operation, from agriculture, manufacturing, warehouses, retailers to customers are explained clearly. Then the reasons and characteristics of food wastes in any point of food supply chain are analyzed. From some case studies and questionnaire investigation, some corresponding methods to reduce food waste are put forward in the following. Lastly, in terms of method s...

  3. Supply chain components

    Directory of Open Access Journals (Sweden)

    Vieraşu, T.

    2011-01-01

    Full Text Available In this article I will go through three main logistics components, which are represented by: transportation, inventory and facilities, and the three secondary logistical components: information, production location, price and how they determine performance of any supply chain. I will discuss then how these components are used in the design, planning and operation of a supply chain. I will also talk about some obstacles a supply chain manager may encounter.

  4. Noninvasive brain stimulation by radioelectric asymmetric conveyor in the treatment of agoraphobia: open-label, naturalistic study

    Directory of Open Access Journals (Sweden)

    Mannu P

    2011-11-01

    Full Text Available Piero Mannu, Salvatore Rinaldi, Vania Fontani, Alessandro Castagna, Matteo Lotti MargottiDepartment of Neuro Psycho Physio Pathology, Rinaldi Fontani Institute, Florence, ItalyBackground: Agoraphobia is considered to be the most serious complication of panic disorder. It involves progressive development of debilitating anxiety symptoms related to being in situations where one would be extremely embarrassed and could not be rescued in the case of a panic attack. This study aimed to investigate the efficacy of noninvasive brain stimulation using a radioelectric asymmetric conveyor (REAC for agoraphobia.Patients and methods: Twenty-three patients (3 males and 20 females suffering from agoraphobia and without a history of panic disorder were evaluated by a psychiatrist using the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition, Text Revision, and the Agoraphobia Scale (AS. The patients were subjected to two 18-session cycles of noninvasive brain stimulation with the REAC, according to an established therapeutic protocol called neuro-psycho-physical optimization.Results: Analyzing the anxiety and avoidance parameters of the AS after the first and second cycles of REAC treatment revealed variation in levels of response to treatment, including weak (AS item 7, moderate (AS items 10 and 13, and good responses (AS items 1–6, 8, 9, 11, 12, and 14–20.Conclusion: These results highlight the potential of the REAC to treat complex clinical situations such as agoraphobia, which is typically resistant to pharmacologic treatments. Furthermore, these data show the advantages of REAC treatment, even compared with modern cognitive behavioral therapy, including a relatively rapid and “stable” clinical response (just over 6 months and economic cost.Keywords: anxiety, avoidance, fear, REAC

  5. FPGA-Based HD Camera System for the Micropositioning of Biomedical Micro-Objects Using a Contactless Micro-Conveyor

    Directory of Open Access Journals (Sweden)

    Elmar Yusifli

    2017-03-01

    Full Text Available With recent advancements, micro-object contactless conveyers are becoming an essential part of the biomedical sector. They help avoid any infection and damage that can occur due to external contact. In this context, a smart micro-conveyor is devised. It is a Field Programmable Gate Array (FPGA-based system that employs a smart surface for conveyance along with an OmniVision complementary metal-oxide-semiconductor (CMOS HD camera for micro-object position detection and tracking. A specific FPGA-based hardware design and VHSIC (Very High Speed Integrated Circuit Hardware Description Language (VHDL implementation are realized. It is done without employing any Nios processor or System on a Programmable Chip (SOPC builder based Central Processing Unit (CPU core. It keeps the system efficient in terms of resource utilization and power consumption. The micro-object positioning status is captured with an embedded FPGA-based camera driver and it is communicated to the Image Processing, Decision Making and Command (IPDC module. The IPDC is programmed in C++ and can run on a Personal Computer (PC or on any appropriate embedded system. The IPDC decisions are sent back to the FPGA, which pilots the smart surface accordingly. In this way, an automated closed-loop system is employed to convey the micro-object towards a desired location. The devised system architecture and implementation principle is described. Its functionality is also verified. Results have confirmed the proper functionality of the developed system, along with its outperformance compared to other solutions.

  6. PLC在胶带输送机上的应用%The Application of PLC on Belt Conveyor

    Institute of Scientific and Technical Information of China (English)

    刘青菊

    2011-01-01

    通过RLC控制系统和PLC可编程控制器的对比,选用可编程序(PLC)控制系统对胶带输送机的电气控制系统进行设计改造,为生产设备集中控制打下基础。本控制系统选用西门子PLC作为控制器,在设计硬件电路中,对PLC及外部低压电器进行选型,设计了硬件接线图并对控制系统提出要求,使之具有控制和保护功能。在软件设计中,给出了程序流程图与梯形图,将硬件和软件有机结合,保证控制系统可靠运行,达到了生产工序要求。%Through the comparison between RLC control system and PLC programmable controller,programmable logic control system(PLC) is used for the electrical control system reform of belt conveyor,to prepare for the centralized control of production equipment.The Siemens PLC control system is used as the controller.In the design of hardware circuit,the selection of proper PLC and external low-voltage electrical appliances is conducted.The hardware wiring diagram is designed and requirement for control system is put forward so that it has control and protection functions.In software design,the program flow chart and ladder diagram is presented,to combine hardware and software to ensure reliable operation of the control system to achieve the production process requirements.

  7. Supply chain planning classification

    Science.gov (United States)

    Hvolby, Hans-Henrik; Trienekens, Jacques; Bonde, Hans

    2001-10-01

    Industry experience a need to shift in focus from internal production planning towards planning in the supply network. In this respect customer oriented thinking becomes almost a common good amongst companies in the supply network. An increase in the use of information technology is needed to enable companies to better tune their production planning with customers and suppliers. Information technology opportunities and supply chain planning systems facilitate companies to monitor and control their supplier network. In spite if these developments, most links in today's supply chains make individual plans, because the real demand information is not available throughout the chain. The current systems and processes of the supply chains are not designed to meet the requirements now placed upon them. For long term relationships with suppliers and customers, an integrated decision-making process is needed in order to obtain a satisfactory result for all parties. Especially when customized production and short lead-time is in focus. An effective value chain makes inventory available and visible among the value chain members, minimizes response time and optimizes total inventory value held throughout the chain. In this paper a supply chain planning classification grid is presented based current manufacturing classifications and supply chain planning initiatives.

  8. Independent sets in chain cacti

    CERN Document Server

    Sedlar, Jelena

    2011-01-01

    In this paper chain cacti are considered. First, for two specific classes of chain cacti (orto-chains and meta-chains of cycles with h vertices) the recurrence relation for independence polynomial is derived. That recurrence relation is then used in deriving explicit expressions for independence number and number of maximum independent sets for such chains. Also, the recurrence relation for total number of independent sets for such graphs is derived. Finaly, the proof is provided that orto-chains and meta-chains are the only extremal chain cacti with respect to total number of independent sets (orto-chains minimal and meta-chains maximal).

  9. Decisive Markov Chains

    CERN Document Server

    Abdulla, Parosh Aziz; Mayr, Richard

    2007-01-01

    We consider qualitative and quantitative verification problems for infinite-state Markov chains. We call a Markov chain decisive w.r.t. a given set of target states F if it almost certainly eventually reaches either F or a state from which F can no longer be reached. While all finite Markov chains are trivially decisive (for every set F), this also holds for many classes of infinite Markov chains. Infinite Markov chains which contain a finite attractor are decisive w.r.t. every set F. In particular, this holds for probabilistic lossy channel systems (PLCS). Furthermore, all globally coarse Markov chains are decisive. This class includes probabilistic vector addition systems (PVASS) and probabilistic noisy Turing machines (PNTM). We consider both safety and liveness problems for decisive Markov chains, i.e., the probabilities that a given set of states F is eventually reached or reached infinitely often, respectively. 1. We express the qualitative problems in abstract terms for decisive Markov chains, and show...

  10. Fields From Markov Chains

    DEFF Research Database (Denmark)

    Justesen, Jørn

    2005-01-01

    A simple construction of two-dimensional (2-D) fields is presented. Rows and columns are outcomes of the same Markov chain. The entropy can be calculated explicitly.......A simple construction of two-dimensional (2-D) fields is presented. Rows and columns are outcomes of the same Markov chain. The entropy can be calculated explicitly....

  11. REVERSE SUPPLY CHAIN

    Directory of Open Access Journals (Sweden)

    Tomasz DOMAGAŁA

    2013-10-01

    Full Text Available The paper focuses on the presentation of the reverse supply chain, of which the role in the modern business grows along with the increasing number of environmental regulations and possibilities of reducing an operating cost. The paper also describes main problems in developing the profitable chain and possibilities to take an action in order to overcome them.

  12. Value Chain Engineering

    DEFF Research Database (Denmark)

    Wæhrens, Brian Vejrum; Slepniov, Dmitrij

    2015-01-01

    This workbook is recommended for the attention of students of and managers in Danish small and medium sized enterprises (SMEs). Danish SMEs are currently facing a number of key challenges related to their position in global value chains. This book provides an insight into value chain management...

  13. Supply Chain Management

    DEFF Research Database (Denmark)

    Wieland, Andreas; Handfield, Robert B.

    Supply chain management has made great strides in becoming a discipline with a standalone body of theories. As part of this evolution, researchers have sought to embed and integrate observed supply chain management phenomena into theoretical statements. In our review, we explore where we have been...

  14. Supply Chain Connectivity: Enhancing Participation in the Global Supply Chain

    OpenAIRE

    Epictetus E. Patalinghug

    2015-01-01

    Supply chain connectivity is vital for the efficient flow of trade among APEC economies. This paper reviews the literature and supply chain management, describes the barriers to enhancing participation in global supply chain, analyzes the various measures of supply chain performance, and suggests steps for the Philippines to fully reap the benefits of the global value chain.

  15. Study on application of high-speed idlers of conveyors%带式输送机高速托辊的应用研究

    Institute of Scientific and Technical Information of China (English)

    刘振; 包继华; 黄世鼎; 郭锋; 王领

    2011-01-01

    After analyzing the application status of the belt conveyor and the idler, the necessity of developing high-speed idlers is proposed. Based on the study of such components as idler shaft, bearing, sealings and bearing pedestal, such key issues of high-speed idlers as radial mn-out, rotary resistance and employment lifespan are discussed, which offers theoretical basis for the design and application of the high-speed idler and the highspeed belt conveyor.%通过对带式输送机及托辊的应用现状进行分析,提出了研发带式输送机高速托辊的必要性.通过对托辊主轴、轴承、筒体、密封结构和轴承座等各部分结构进行研究,探讨了高速托辊在径向圆跳动、旋转阻力和使用寿命等方面要解决的关键技术,为高速托辊以及高速带式输送机的设计应用提供理论基础.

  16. 刮板输送机中部槽联接结构的尺寸设计%Dimension Design of Line-Pan Connector on Scraper Conveyor

    Institute of Scientific and Technical Information of China (English)

    闵令江; 于贵

    2011-01-01

    The deflection between neighboring line-pans,both in horizontal and vertical direction,of the scraper conveyor are mainly restricted by the structural dimensions of line-pan connector,including dumbbell-pin,line-pan head and long hole of pin-rack seat.The design of these dimensions is always done graphically,directly determines on the service life of the line-pan and the performance of whole conveyor.%刮板输送机相邻中部槽水平方向和垂直方向的相对偏转主要受哑铃销、中部槽端头及销轨座长孔的尺寸限制,直接影响中部槽的使用寿命和整个刮板输送机的工作性能,采用作图法设计刮板输送机中部槽联接结构尺寸。

  17. Development of Bonding Compound for Steel Cord Conveyor Belt%钢丝绳芯输送带粘合胶的研制

    Institute of Scientific and Technical Information of China (English)

    曲成东

    2011-01-01

    The bonding compound of steel cord conveyor belt was developed. The optimized formulation was as follows: NR 60, SBR 20, BR 20, carbon black N220 40, silica 15, zinc oxide 5, stearic acid 1, pine tar 7, antioxidant 4010NA/BLE-C 1/1. 5, adhesive RS/A 3/2. 5, cobalt boroacylate 2. 2,sulfur 2. 5,accelerator CZ 1. 2. The compound with optimized formulation possessed good comprehensive properties and excellent adhesion property,and met the application requirements in steel cord conveyor belt.%研制钢丝绳芯输送带粘合胶.粘合胶的优化配方为:NR 60,SBR 20,BR 20,炭黑N220 40,白炭黑15,氧化锌 5,硬脂酸 1,松焦油 7,防老剂4010NA/BLE-C 1/1.5,粘合剂RS/A 3/2.5,硼酰化钴 2.2,硫黄2.5,促进剂CZ 1.2.优化配方胶料综合性能良好,粘合性能优异,能够满足钢丝绳芯输送带使用要求.

  18. Improvement Design of Tension Device for Tail of Scraper Conveyor%刮板运输机机尾张紧装置的改进

    Institute of Scientific and Technical Information of China (English)

    敖剑忠; 敖金龙

    2014-01-01

    坪湖矿洗煤厂的刮板运输机尾张紧调节通常采用丝杆-滑块拉紧装置,其所处环境差,设备易腐蚀,使得机尾调节难度较大,严重影响设备的正常使用,给设备运行留下了安全隐患。洗煤厂根据自身条件对设备进行改进,研制出蜗轮蜗杆减速器张紧装置,使得机尾调节变得安全、方便、快捷,获得了成功应用。%The lead-screw -slider tension device used to be used in tension adjustment for the tail of scraper conveyor in Pinghu Coal Washing Plant .The poor environmental conditions and perishable equipment made the tail adjustment difficult ,which seriously affected the normal use of equipment and left safety hazards for equip-ment running .The paper presents the improvement design of tension device for the tail of scraper conveyor , which has made the tail adjustment safe ,convenient and fast .

  19. Development of Parameter Design System of Screw Conveyor%螺旋输送机参数设计系统的开发

    Institute of Scientific and Technical Information of China (English)

    刘海军; 孙井坤; 郑先哲

    2012-01-01

    Parameter design of screw conveyor was realized according to the computation model of screw convey or parameters on platform of Visual Basic 6.0 with object oriented programming. Overall function of system, design of process, and the implementation technique of every functional module were discussed. Developing and running environment of the system were introduced. Parameters according with different working conditions can be designed using the system, which makes design work of screw conveyor fast and exact.%根据螺旋输送机参数计算的数学模型,在Visual Basic6.0的平台下,利用面向对象的程序设计,实现了螺旋输送机的参数计算设计。讨论了系统总体功能及流程的设计以及各主要功能模块的实现技术,并阐述了系统的开发和运行环境。该系统能够设计出符合不同工作条件的螺旋输送机参数,使螺旋输送机的设计工作快速、准确。

  20. Análisis de la fuerza axial en un transportador de sinfín // Analysis of axial force in a screw conveyor.

    Directory of Open Access Journals (Sweden)

    F. Aguilar Parés

    1999-01-01

    Full Text Available Durante el movimiento de un material en un transportador de sinfín surge una fuerza en dirección axial que influye en laselección de uno de los cojinetes de apoyo del equipo. En el artículo aparecen algunas soluciones constructivas que tienen encuentan la fuerza axial. Por otro lado se establece la relación entre la fuerza axial y el empuje axial y se precisa de quiendepende el sentido del empuje axial. Por último se propone un modelo matemático que relaciona la fuerza axial con la potenciarequerida por el equipo.Palabras claves: Transportador de sinf in, fuerza axial , empuje axial ._________________________________________________________________________AbstractDuring the movement of material in a screw conveyor surge a force in axial direction that influence in the selection of one ofthe equipment support bearings. Some constructive solutions appear in the article for considering the axial force. In the otherhand it is established the relation between axial force and axial thurst and it is precised whose direction thurst axial depend of.Finally it is proposed a mathematic model that relates the axial force with the power required by the equipment.Key words: Screw conveyor, axial force, axial thurst .

  1. Design of Scraper Conveyor Condition Monitoring System based on ARM%基于ARM的刮板输送机状态监测系统的设计

    Institute of Scientific and Technical Information of China (English)

    于平; 刘曦永; 小云

    2015-01-01

    针对刮板输送机传动系统的故障率较高,设计了基于ARM的刮板输送机状态的监测系统,其处理器采用的是英创生产的ARM9 EM9161,并结合数据采集装置和无线信号传输模块,实现了对电动机和减速器相关重要参数的监测报警。文中讲述了系统的硬件构成, WinCE的软件环境等。该设计将应用于煤矿状态监测领域,具有很好的应用价值。%The paper is designed the state of scraper conveyor monitoring system based on ARM for the high failure rate of scraper conveyor drive system. The system uses ARM9 EM9161 development board produced by YingChuang company, combines with data acquisition devices and wireless signal transmission module, realizes the important parameters related to the motor and gear unit to monitor alarming. The paper describes the configuration of the system's hardware, software envi-ronment of WINCE and so on. The design will apply to the field of early-warning and monitoring in mine, and have very good value.

  2. Design and calculation of Scew Conveyor%基于螺旋输送机的设计计算

    Institute of Scientific and Technical Information of China (English)

    李彦

    2014-01-01

    此螺旋输送机的设计主要用于饲料的传送,根据给定的输送量以及物料特性分别进行叶片用料实形、螺旋直径、螺旋转速等主要参数的设计计算。传动部分采用电动机带动皮带,皮带带动一级减速器、减速器连接机体的传动方式。根据计算得出的主要参数选择合适的电动机,从而确定带轮以及减速器的传动比,将主要后续工作引向一级减速器的设计,其中包括主要传动轴的校核、齿轮的选择等计算工作。最后根据计算所得结果整理出安装尺寸以及装配图的绘制。%The screw conveyor is mainly designed to convey feed. Design and calculate the real shape of material, the diame-ter of screw, screw speed and other main parameters of the blade respectively according to the given conveying capacity and ma-terial properties. The transmission part starts with a motor driving belt,and then the transmission belt driving first-level reducer and the connection body of reducer. Select appropriate motor according to the main parameters calculated, and then determine the conveying ratio of belt pulley and reducer. The design of driving main follow-up work to a reducer, includes checking of main transmission shafts the selection of gears and other calculation. Finally, sort out the installation dimensions and draw assembly drawing according to the results calculated.

  3. Project Decision Chain

    DEFF Research Database (Denmark)

    Rolstadås, Asbjørn; Pinto, Jeffrey K.; Falster, Peter

    2015-01-01

    To add value to project performance and help obtain project success, a new framework for decision making in projects is defined. It introduces the project decision chain inspired by the supply chain thinking in the manufacturing sector and uses three types of decisions: authorization, selection......, and plan decision. A primitive decision element is defined where all the three decision types can be accommodated. Each task in the primitive element can in itself contain subtasks that in turn will comprise new primitive elements. The primitive elements are nested together in a project decision chain....

  4. Plastic value chains

    DEFF Research Database (Denmark)

    Baxter, John; Wahlstrom, Margareta; Zu Castell-Rüdenhausen, Malin

    2014-01-01

    Optimizing plastic value chains is regarded as an important measure in order to increase recycling of plastics in an efficient way. This can also lead to improved awareness of the hazardous substances contained in plastic waste, and how to avoid that these substances are recycled. As an example......, plastics from WEEE is chosen as a Nordic case study. The project aims to propose a number of improvements for this value chain together with representatives from Nordic stakeholders. Based on the experiences made, a guide for other plastic value chains shall be developed....

  5. 伸缩带式输送机中问卸载式多点驱动装置的设计%The design of middle unload and multipoint driving device of extensible type belt conveyor

    Institute of Scientific and Technical Information of China (English)

    陈文

    2011-01-01

    The article introduces the technological achievements and economic benefits of middle unload and multipoint driving of extensible type belt conveyor.%介绍伸缩带式输送机中间卸载式多点驱动装置的设计、应用,以及具有良好的技术和经济效益。

  6. Design of Belt Conveyor Control System Based on PLC SIEMENS S7-200%基于PLC西门子S7-200的带式输送机控制系统设计

    Institute of Scientific and Technical Information of China (English)

    李博

    2015-01-01

    Belt conveyor is a conveyor belt driven by the driving roller, as a continuous conveying equipment, which is one of the main transport equipment in modern mines. In particular, the modern large-scale coal mines, coal transportation is mainly through the conveyor to complete. Conveyor is characterized by large transmission capacity, small power consumption, simple structure, strong adaptability to the material, easy to form water production line, so that the enterprise production process to achieve mechanization. Belt conveyor in coal mine and coal preparation plant plays a important role, under the background of enterprise development of coal mining mechanization, automation, automatic control operation of the conveyor belt is particularly important. In this paper, the design and programming of the conveyor system are carried out with the SIEMENS S7-200 programmable controller as an example.%带式输送机是一种由驱动滚筒带动的输送带,作为一种连续输送的设备,其是现代矿井的主要运输设备之一.尤其是现代化大型的煤矿,煤的运输主要通过输送机来完成.输送机的特点是输送能力大,功耗小,构造简单,对物料的适应性强,便于组成流水生产线,使企业生产过程实现机械化.带式输送机在煤矿及洗煤厂发挥着重要作用,在企业发展采煤机械化、自动化的背景下,带式输送机的自动控制运行显得尤为重要.本文以西门子S7-200可编控制器为例进行输送机系统的编程和设计.

  7. Supply chain risk management

    Directory of Open Access Journals (Sweden)

    Christian Hollstein

    2013-03-01

    Full Text Available Background: Supply chain risk management increasingly gains prominence in many international industries. In order to strengthen supply chain structures, processes, and networks, adequate potentials for risk management need to be built (focus on effective logistics and to be utilized (focus on efficient logistics. Natural-based disasters, such as the case of Fukushima, illustrate how crucial risk management is. Method: By aligning a theoretical-conceptual framework with empirical-inductive findings, it may be hypothesized that logistical systems do have a positive effect on supply chain risk management activities.  Result/conclusion:  Flexibility and capacity, as well as redundancy and standardization, are often viewed as being conflictionary. It shows, however, that in the light of supply chain risk management, those factors may yield a common benefit if proper logistics systems are applied.  

  8. Editorial: Supply Chain Management

    Directory of Open Access Journals (Sweden)

    Aidonis, D.

    2012-01-01

    Full Text Available This special issue has followed up the 2nd Olympus International Conference on Supply Chains held on October 5-6, 2012, in Katerini, Greece. The Conference was organized by the Department of Logistics of Alexander Technological Educational Institution (ATEI of Thessaloniki, in collaboration with the Laboratory of Quantitative Analysis, Logistics and Supply Chain Management of the Department of Mechanical Engineering, Aristotle University of Thessaloniki (AUTH. During the 2-Days Conference more than 50 research papers were presented covering the following thematic areas: (i Business Logistics, (ii Transportation, Telematics and Distribution Networks, (iii Green Logistics, (iv Information and Communication Technologies in Supply Chain Management, and (v Services and Quality. Three keynote invited speakers addressed interesting issues for the Humanitarian Logistics, Green Supply Chains of the Agrifood Sector and the Opportunities and Prospects of Greek Ports chaired Round Tables with other Greek and Foreign Scientists and Specialists.

  9. Moldova - Value Chain Training

    Data.gov (United States)

    Millennium Challenge Corporation — The evaluation of the GHS value chain training subactivity wwas designed to measure the extent, if any, to which the training activities improved the productivity...

  10. Light chain nephropathy

    Directory of Open Access Journals (Sweden)

    Sihem Darouich

    2015-01-01

    Full Text Available Light chain deposition disease (LCDD is characterized by the tissue deposition of monotypic immunoglobulin light chains of either kappa or lambda isotype. It is the archetypal systemic disease that is most frequently diagnosed on a kidney biopsy, although the deposits may involve several other organs. This brief review focuses on the clinicopathological features of LCDD-associated nephropathy with an emphasis on the diagnostic and therapeutic difficulties related to this elusive condition.

  11. Supply Chain Interoperability Measurement

    Science.gov (United States)

    2015-06-19

    Base, Ohio DISTRIBUTION STATEMENT A. APPROVED FOR PUBLIC RELEASE; DISTRIBUTION UNLIMITED. The views expressed in this thesis ...chain connections are often hindered by inconsistent vocabularies , terms, ontologies, and semantics utilized by various supply chain members (Ye et...eg.COOPERATION PROCESS)-Don’t address synergies between SC X X X X X X X X Don’t track effectiveness over time-lack of learning by experience Loss of SC

  12. Supply chain quality management

    OpenAIRE

    Hannan Amoozad Mahdiraji; Meysam Arabzadeh; Reza Ghaffari

    2012-01-01

    In recent years, there are several methods introduced for the improvement of operational performances. Total quality management and supply chain management are two methods recommended for this purpose. These two approaches have been studied in most researches separately, while they have objectives in common, and this makes them a strategic means, which can be used, simultaneously. Total quality management and supply chain management play significant roles to increase the organizational compet...

  13. Innovation Across the Supply Chain

    DEFF Research Database (Denmark)

    Druehl, Cheryl; Carrillo, Janice; Hsuan, Juliana

    Innovation is an integral part of every firm’s ongoing operations. Beyond product innovation, supply chain innovations offer a unique source of competitive advantage. We synthesize recent research on innovation in the supply chain, specifically, innovative supply chain processes...

  14. MASTERING SUPPLY CHAIN RISKS

    Directory of Open Access Journals (Sweden)

    Borut Jereb

    2012-11-01

    Full Text Available Risks in supply chains represent one of the major business issues today. Since every organizationstrives for success and uninterrupted operations, efficient supply chain risk management is crucial.During supply chain risk research at the Faculty of Logistics in Maribor (Slovenia some keyissues in the field were identified, the major being the lack of instruments which can make riskmanagement in an organization easier and more efficient. Consequently, a model which captures anddescribes risks in an organization and its supply chain was developed. It is in accordance with thegeneral risk management and supply chain security standards, the ISO 31000 and ISO 28000families. It also incorporates recent finding from the risk management field, especially from theviewpoint of segmenting of the public.The model described in this paper focuses on the risks itself by defining them by different keydimensions, so that risk management is simplified and can be undertaken in every supply chain andorganizations within them. Based on our mode and consequent practical research in actualorganizations, a freely accessible risk catalog has been assembled and published online from the risksthat have been identified so far. This catalog can serve as a checklist and a starting point in supplychain risk management in organizations. It also incorporates experts from the field into a community,in order to assemble an ever growing list of possible risks and to provide insight into the model andits value in practice.

  15. Issues on Supply Chain Management

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    Although supply chain is regarded as an integrated pr ocess, actually, researchers and practitioners have primarily investigated the v arious processes of the supply chain individually. The competitive field in most markets requires well-designed integrated supply chain instead of individual o perations. In this paper, some traditional thinking of supply chain is given fir st, then SCM (Supply Chain Management) is introduced, which views the entire sup ply chain as a whole rather than individual process a...

  16. Application of plasma cladding remanufacturing technology on scraper conveyor%刮板输送机等离子熔覆再制造强化技术的应用

    Institute of Scientific and Technical Information of China (English)

    秦文光

    2016-01-01

    为了解决刮板输送机因磨损失效、使用寿命短的问题,对刮板输送机失效形式进行了分析,采用等离子熔覆技术对磨损的刮板输送机进行耐磨再制造强化处理,研究了刮板输送机等离子熔覆再制造在工业生产中的应用。结果表明,等离子熔覆再制造技术成功应用于工业生产,能显著提高刮板输送机的耐磨性能,可有效延长其使用寿命,具有重要的工业推广应用价值,社会效益显著。%In order to solve the scraper conveyor for wear failure and short service life,the failure forms of scraper conveyor were ana⁃lyzed,the plasma cladding wear resistance technology was used to wear resistance remanufacturing and strengthening treatment of the scraper conveyor,the application of the plasma cladding remanufacturing of the scraper conveyor in industrial production was studied. The results show that the plasma cladding remanufacturing technique was successfully applied in industrial production,can greatly im⁃prove the wear resistance of the scraper conveyor,effectively prolong the service life.Moreover,it has more important promotion prospects and good application value.

  17. 螺旋叶片对垂直螺旋输送机性能的影响%Influence of screw blade of performance for vertical screw conveyor

    Institute of Scientific and Technical Information of China (English)

    余书豪; 谌永祥

    2016-01-01

    为了研究在垂直螺旋输送机物料输送过程中的细观甚至微观特征,降低颗粒输送过程中近轴处的涡流引起的能耗,增大近壁面处的轴向速度,考察不同母线形状的螺旋叶片,借助颗粒仿真软件EDEM 2.5进行数值试验,模拟垂直螺旋输送机内颗粒速度、功率消耗、能量耗散、质量流量等性能指标,通过数据处理软件Origin Pro 8.0作图分析各项指标的变化情况.结果表明:与传统直线型母线的螺旋叶片相比,弯曲型母线的螺旋叶片在近轴处的切向速度减小73.87%,大大降低近轴处的涡流效应;近壁面处的轴向速度在高转速时增大12.34%,完成预定输送任务基础上,有效地降低额外的能量消耗,提升整机性能.%In order to figure out the meso and microscopic characteristics during bulk material being conveyed within the vertical screw conveyor and reduce the swirl flow near the screw shag and increase the axial velocity of particles near the wall during the particulate being conveyed,the different shape screw blades were surveyed,by means of the software of particle simulation EDEM 2.5,numerical test was done,the standards of performance such as particle velocity,power consumption,energy dissipation and average mass flow rate within the vertical screw conveyor were simulated.The trend charts were plotted based on the data processing software Origin Pro 8.0,to analysis the changes of indicators.The result shows that compared with the line type screw blade,the curved screw blade of tangential velocity near the shaft is reduce by 73.87%,the vortex motion decreases evidently.The axial velocity near the wall is increased by 12.34%,the extra energy dissipation effectively reduces on the basis of finishing the intended work,which promotes the whole performance of vertical screw conveyor

  18. Phasic Triplet Markov Chains.

    Science.gov (United States)

    El Yazid Boudaren, Mohamed; Monfrini, Emmanuel; Pieczynski, Wojciech; Aïssani, Amar

    2014-11-01

    Hidden Markov chains have been shown to be inadequate for data modeling under some complex conditions. In this work, we address the problem of statistical modeling of phenomena involving two heterogeneous system states. Such phenomena may arise in biology or communications, among other fields. Namely, we consider that a sequence of meaningful words is to be searched within a whole observation that also contains arbitrary one-by-one symbols. Moreover, a word may be interrupted at some site to be carried on later. Applying plain hidden Markov chains to such data, while ignoring their specificity, yields unsatisfactory results. The Phasic triplet Markov chain, proposed in this paper, overcomes this difficulty by means of an auxiliary underlying process in accordance with the triplet Markov chains theory. Related Bayesian restoration techniques and parameters estimation procedures according to the new model are then described. Finally, to assess the performance of the proposed model against the conventional hidden Markov chain model, experiments are conducted on synthetic and real data.

  19. Nanoscale mass conveyors

    Science.gov (United States)

    Regan, Brian C.; Aloni, Shaul; Zettl, Alexander K.

    2008-03-11

    A mass transport method and device for individually delivering chargeable atoms or molecules from source particles is disclosed. It comprises a channel; at least one source particle of chargeable material fixed to the surface of the channel at a position along its length; a means of heating the channel; and a means for applying an controllable electric field along the channel, whereby the device transports the atoms or molecules along the channel in response to applied electric field. In a preferred embodiment, the mass transport device will comprise a multiwalled carbon nanotube (MWNT), although other one dimensional structures may also be used. The MWNT or other structure acts as a channel for individual or small collections of atoms due to the atomic smoothness of the material. Also preferred is a source particle of a metal such as indium. The particles move by dissociation into small units, in some cases, individual atoms. The particles are preferably less than 100 nm in size.

  20. Spatial Data Supply Chains

    Science.gov (United States)

    Varadharajulu, P.; Azeem Saqiq, M.; Yu, F.; McMeekin, D. A.; West, G.; Arnold, L.; Moncrieff, S.

    2015-06-01

    This paper describes current research into the supply of spatial data to the end user in as close to real time as possible via the World Wide Web. The Spatial Data Infrastructure paradigm has been discussed since the early 1990s. The concept has evolved significantly since then but has almost always examined data from the perspective of the supplier. It has been a supplier driven focus rather than a user driven focus. The current research being conducted is making a paradigm shift and looking at the supply of spatial data as a supply chain, similar to a manufacturing supply chain in which users play a significant part. A comprehensive consultation process took place within Australia and New Zealand incorporating a large number of stakeholders. Three research projects that have arisen from this consultation process are examining Spatial Data Supply Chains within Australia and New Zealand and are discussed within this paper.

  1. Environmental Retail Supply Chains

    DEFF Research Database (Denmark)

    Kotzab, Herbert; Munch, Hilde; de Faultrier, Birgitte;

    2011-01-01

    Purpose – The purpose of this paper is to develop a scale that evaluates the environmental elements in retail supply chains and to examine the environmental supply chain management initiatives of the world's largest 100 retailing companies. Design/methodology/approach – The empirical evaluation has...... short-term oriented (green operations). Long-term oriented green design initiatives were hardly observed. Furthermore, the specific environmental activities of three retailers from Denmark, France and the UK were compared. Research limitations/implications – The empirical study investigates supply chain...... operations of retailers and excludes other areas of retail management. The results are based on material that is published by the respective companies and thus do not include internal reports. Originality/value – The main contribution of this paper is to test the proposition that global retailers follow...

  2. The Green Design of the Belt Conveyor for Cement Industry%浅谈水泥工业用带式输送机的绿色设计

    Institute of Scientific and Technical Information of China (English)

    黄兰

    2015-01-01

    带式输送机广泛应用于水泥工业的多个环节,在转运和输送粉粒状物料的过程中,易产生扬尘和洒落,造成粉尘污染。为了有效降低粉尘污染,引入绿色设计理念,介绍相关粉尘控制的绿色设计方法、技术和措施,实现带式输送机的清洁运输。%Belt conveyor is widely used in cement industry .When transferring the powdery or particulate material ,dust pollution is caused by the fugitive dust .In order to reduce dust pollution ,introducing the concept of green design ,including green design methods ,techniques and measures for dust control .

  3. 冰晶石湿料螺旋输送机的故障分析%Fault analysis of screw conveyor for transporting wet material of cryolite

    Institute of Scientific and Technical Information of China (English)

    业文成

    2012-01-01

    LS型螺旋输送机输送冰晶石湿料常发生螺旋轴扭断故障,分析故障产生的原因,介绍为防止螺旋输送机故障在管理、物料及设备方面所采取的整改措施,达到了设备稳定运行的效果。%The LS type screw conveyor for transporting wet material of cryolite screw shaft, the reasons of the fault are analyzed, the rectification measures in usually happen twist off of management, materials and equipment of the action for preventing fault are introduced, achieving the stable operation of the equipment.

  4. 螺旋输送机在固废处理中的应用与展望%Application and Prospect of Screw Conveyor in Solid Waste Disposal

    Institute of Scientific and Technical Information of China (English)

    柴彬; 闫志海; 魏少华; 葛砚; 唐滨

    2016-01-01

    螺旋输送机具有结构简单、横截面积小、密封性好、操作方便、维修容易、便于封闭运输等优点。简要介绍了螺旋输送机的结构组成和工作原理及其在飞灰处理、除臭卸料、垃圾渗沥液等固废处理方面的应用。%The screw conveyor has advantages of simple structure,small cross-sectional area,good sealing,convenient operation,easy to maintain and enclosed conveying,etc.This article briefly introduces its structure,working principle and application in solid waste disposal such as fly ash handling,deodorant discharge and leachate treatment.

  5. 带式输送机驱动滚筒的应力分析%Stress analysis of driving drum of belt conveyor

    Institute of Scientific and Technical Information of China (English)

    刘金依; 薛河; 聂文杰

    2001-01-01

    采用大型有限元分析软件ANSYS,对带式输送机驱动滚筒的应力分布规律进行了计算和分析,从理论上对滚筒的常见破坏形式进行了分析研究,为进一步改进滚筒的受力状况,实现滚筒的标准化生产提供了必要的理论依据。%This paper calculates and analyses the stress distributing rule of the driving drum of belt conveyor by using ANSYS software,and investigates the usual destroying forms of it in theory,and provides essential theoretic gist for improving its suffering force situation and realizing its standardization production.

  6. Fuzzy Markov chains: uncertain probabilities

    OpenAIRE

    2002-01-01

    We consider finite Markov chains where there are uncertainties in some of the transition probabilities. These uncertainties are modeled by fuzzy numbers. Using a restricted fuzzy matrix multiplication we investigate the properties of regular, and absorbing, fuzzy Markov chains and show that the basic properties of these classical Markov chains generalize to fuzzy Markov chains.

  7. Essentials of supply chain management

    CERN Document Server

    Hugos, Michael H

    2011-01-01

    The latest thinking, strategies, developments, and technologies to stay current in supply chain management Presenting the core concepts and techniques of supply chain management in a clear, concise and easily readable style, the Third Edition of Essentials of Supply Chain Management outlines the most crucial tenets and concepts of supply chain management.

  8. Supply-Chain Optimization Template

    Science.gov (United States)

    Quiett, William F.; Sealing, Scott L.

    2009-01-01

    The Supply-Chain Optimization Template (SCOT) is an instructional guide for identifying, evaluating, and optimizing (including re-engineering) aerospace- oriented supply chains. The SCOT was derived from the Supply Chain Council s Supply-Chain Operations Reference (SCC SCOR) Model, which is more generic and more oriented toward achieving a competitive advantage in business.

  9. Electron Transfer Chain Catalysis

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    @@ Electron-transfer chain (ETC) catalysis belongs to the family of chain reactions where the electron is the catalyst. The ETC mechanism could be initiated by chemical activation, electrochemistry, or photolysis. If this pathway is applied to the preparation of organometallic complexes, it utilizes the greatly enhanced reactivity of organometallic 17e and 19e radicals. The chemical propagation is followed by the cross electron-transfer while the electron-transfer step is also followed by the chemical propagation, creating a loop in which reactants are facilely transformed into products. Interestingly the overall reaction is without any net redox change.

  10. Electron Transfer Chain Catalysis

    Institute of Scientific and Technical Information of China (English)

    LIU; LingKang

    2001-01-01

    Electron-transfer chain (ETC) catalysis belongs to the family of chain reactions where the electron is the catalyst. The ETC mechanism could be initiated by chemical activation, electrochemistry, or photolysis. If this pathway is applied to the preparation of organometallic complexes, it utilizes the greatly enhanced reactivity of organometallic 17e and 19e radicals. The chemical propagation is followed by the cross electron-transfer while the electron-transfer step is also followed by the chemical propagation, creating a loop in which reactants are facilely transformed into products. Interestingly the overall reaction is without any net redox change.  ……

  11. METRODOS: Meteorological preprocessor chain

    DEFF Research Database (Denmark)

    Astrup, P.; Mikkelsen, T.; Deme, S.

    2001-01-01

    The METRODOS meteorological preprocessor chain combines measured tower data and coarse grid numerical weather prediction (NWP) data with local scale flow models and similarity scaling to give high resolution approximations of the meteorological situation. Based on available wind velocity...... - heat flux related measurement, e.g. a temperature gradient, are used to give local values of friction velocity and Monin-Obukhov length plus an estimate of the mixing height. The METRODOS meteorological preprocessor chain is an integral part of the RODOS - Real Time On Line Decision Support - program...

  12. Modelling the coal chain

    Energy Technology Data Exchange (ETDEWEB)

    Gertenbach, J.-D.; Varendorff, R. von [Knowledge Based Engineering, Sandton (South Africa)

    1999-03-01

    Managing the supply chain in an integrated coal operation involves many operation and control options often too complex for the human mind to comprehend and react to. By integrating all the knowledge of a supply chain into an expert system, both off-line and on-line real time decisions are possible. Knowledge Based Engineering based in South Africa, has gained valuable experience in modelling such mining operations. The article discusses the methodologies that the company has implemented. KBE uses Gensym`s G2 Real Time Expert System as the foundation of the system and the knowledge base is developed modularly.

  13. 圆管带式输送机压陷阻力的计算方法%Method of calculating indentation resistance of tubular belt conveyor

    Institute of Scientific and Technical Information of China (English)

    陈洪亮; 熊爽

    2013-01-01

    通过分析圆管带式输送机的托辊组与输送带之间的作用关系,得出圆管带式输送机的压陷阻力是圆管状输送带与圆柱形辊子的空间接触产生的,应采用二维模型计算压陷阻力.通过DEM仿真方法分析了不同充填率下物料在托辊组各个辊子上的正压力分布,采用Nuttall基于广义的Maxwell二维模型计算式,应用MATLAB通过迭代方法计算压陷阻力矩,进而实现对压陷阻力和压陷阻力系数的计算.%After analyzing the interaction between idler group and belt of the tubular belt conveyor,the paper concluded that the indentation resistance of the tubular belt conveyor produced due to the spatial contact between tubular belt and cylindrical idler,so 2D model should be applied to calculation of the indentation resistance.In addition,DEM simulation method was used to analyze the distribution of normal pressure on each idler at various material filling rate.Calculation formula of 2D Nuttall model based on generalized Maxwell model and MATLAB iteration method were used to calculate the indentation resistance moment,so as to calculate the indentation resistance and indentation resistance coefficient.

  14. Dynamic Conveyor Tracking for Delta Robot%基于 Delta 并联机器人的传送带动态跟踪

    Institute of Scientific and Technical Information of China (English)

    邓明星; 刘冠峰; 张国英

    2015-01-01

    Delta并联机器人是最典型的空间三自由度移动的并联机构,其在3C电子产品行业、食品包装行业、生物制药行业均得到了广泛的应用。主要以Delta并联机器人为研究对象,通过视觉系统定位物体的位姿,再结合传送带编码器的位置反馈信息,计算出物体在机器人坐标系下面的实时位姿。实验结果表明,机器人在位置模式下,通过改进后的PID算法,能预测传送带上物体的位姿,并实时调整自身移动速度和末端位姿来跟踪传送带上的物体,最终实现对目标的动态跟踪抓取。%The Delta parallel robot is the most typical space moving parallel mechanism which has three degree of freedom .It is widely used in 3C electronic products ,food packaging and pharmaceutical packaging .In this paper ,Delta parallel robot was taken as study objective ,the pose of the object was got by machine vision system ,which was coupled with the position feedback information of conveyor encoder ,then the object’s real-time pose in the robot coordinate was calculated .The experiment results show that the robot can predict the object’s pose on the conveyor belt ,adjust its speed and pose by the improved PID algorithm in the position mode ,realize the dynamic tracking fetch of the target finally .

  15. A case study on the formation and evolution of ice supersaturation in the vicinity of a warm conveyor belt's outflow region

    Directory of Open Access Journals (Sweden)

    P. Spichtinger

    2005-01-01

    Full Text Available A case study is presented on the formation and evolution of an ice-supersaturated region (ISSR that was detected by a radiosonde in NE Germany at 06:00 UTC 29 November 2000. The ISSR was situated in the vicinity of the outflow region of a warm conveyor belt associated with an intense event of cyclogenesis in the eastern North Atlantic. Using ECMWF analyses and trajectory calculations it is determined when the air parcels became supersaturated and later subsaturated again. In the case considered, the state of air parcel supersaturation can last for longer than 24h. The ISSR was unusually thick: while the mean vertical extension of ISSRs in NE Germany is about 500m, the one investigated here reached 3km. The ice-supersaturated region investigated was bordered both vertically and horizontally by strongly subsaturated air. Near the path of the radiosonde the ISSR was probably cloud free, as inferred from METEOSAT infrared images. However, at other locations within the ISSR it is probable that there were cirrus clouds. Relative humidity measurements obtained by the Lindenberg radiosonde are used to correct the negative bias of the ECMWF humidity and to construct two-dimensional maps of ice supersaturation over Europe during the considered period. A systematic backward trajectory analysis for the ISSRs on these maps shows that the ISSR air masses themselves experienced only a moderate upward motion during the previous days, whereas parts of the ISSRs were located just above strongly ascending air masses from the boundary layer. This indicates qualitatively that warm conveyor belts associated with mid-latitude cyclogenesis are disturbances that can induce the formation of ISSRs in the upper troposphere. The ISSR maps also lead us to a new perception of ISSRs as large dynamic regions of supersaturated air where cirrus clouds can be embedded at some locations while there is clear air at others.

  16. A case study on the formation and evolution of ice supersaturation in the vicinity of a warm conveyor belt’s outflow region

    Directory of Open Access Journals (Sweden)

    P. Spichtinger

    2004-12-01

    Full Text Available A case study is presented on the formation and evolution of an ice-supersaturated region (ISSR that was detected by a radiosonde in NE Germany at 06:00 UTC 29 November 2000. The ISSR was situated in the vicinity of the outflow region of a warm conveyor belt associated with an intense event of cyclogenesis in the eastern North Atlantic. Using ECMWF analyses and trajectory calculations it is determined when the air parcels became supersaturated and later subsaturated again. In the case considered, the state of air parcel supersaturation can last for longer than 24 h. The ISSR was unusually thick: while the mean vertical extension of ISSRs in NE Germany is about 500 m, the one investigated here reached 3 km. The investigated ice-supersaturated region was bordered both vertically and horizontally by strongly subsaturated air. Near the path of the radiosonde the ISSR was probably cloud free, as inferred from METEOSAT infrared images. However, at other locations within the ISSR it is probable that there were cirrus clouds. Relative humidity measurements are used to correct the negative bias of the ECMWF humidity and to construct two-dimensional maps of ice supersaturation over Europe during the considered period. A systematic backward trajectory analysis for the ISSRs on these maps shows that the ISSR air masses themselves experienced only a moderate upward motion during the previous days, whereas parts of the ISSRs were located just above strongly ascending air masses from the boundary layer. This indicates qualitatively that warm conveyor belts associated with mid-latitude cyclogenesis are disturbances that can induce the formation of ISSRs in the upper troposphere. The ISSR maps also lead us to a new perception of ISSRs as large dynamic regions of supersaturated air where cirrus clouds can be embedded at some locations while there is clear air at others.

  17. Integrated supply chain risk management

    Directory of Open Access Journals (Sweden)

    Riaan Bredell

    2007-11-01

    Full Text Available Integrated supply chain risk management (ISCRM has become indispensable to the theory and practice of supply chain management. The economic and political realities of the modern world require not only a different approach to supply chain management, but also bold steps to secure supply chain performance and sustainable wealth creation. Integrated supply chain risk management provides supply chain organisations with a level of insight into their supply chains yet to be achieved. If correctly applied, this process may optimise management decision-making and assist in the protection and enhancement of shareholder value.

  18. Independent sets in chain cacti

    OpenAIRE

    Sedlar, Jelena

    2011-01-01

    In this paper chain cacti are considered. First, for two specific classes of chain cacti (orto-chains and meta-chains of cycles with h vertices) the recurrence relation for independence polynomial is derived. That recurrence relation is then used in deriving explicit expressions for independence number and number of maximum independent sets for such chains. Also, the recurrence relation for total number of independent sets for such graphs is derived. Finaly, the proof is provided that orto-ch...

  19. Standard handbook of chains chains for power transmission and material handling

    CERN Document Server

    Chain Association, American

    2005-01-01

    A BRIEF HISTORY OF THE DEVELOPMENT OF CHAINEarly DevelopmentsCog ChainCast Detachable ChainCast Pintle ChainPrecision Roller ChainEngineering Steel ChainSilent ChainFlat-Top ChainTerminologyA CHAIN OVERVIEW: USES AND ADVANTAGESGeneralTypes of ChainScope of Chains CoveredStyles and Forms of ChainsStraight and Offset Link ChainsChains With and Without RollersUses of ChainStandard Chains and Their UsesThe Advantages of Chains in ApplicationsAdvantages of Roller Chains in DrivesAdvantages of Silent Chain Drives

  20. Development Value Chains meet Business Supply Chains : The concept of Global Value Chains unraveled

    NARCIS (Netherlands)

    S. Drost (Sarah); J.C.A.C. van Wijk (Jeroen); S. Vellema (Sietze)

    2011-01-01

    textabstractValue chain promotion is considered a key element of private sector development strategies and pro-poor growth. However, (value) chain concepts are rather complex and unclear. This paper unravels the concept of global value chains and studies the diversity of key value chain-related (sup

  1. 沥青混合料保温车螺旋输送机结构设计和仿真%Design and Simulation of the Screw Conveyor for Asphalt Mixing Material Insulation Vehicle

    Institute of Scientific and Technical Information of China (English)

    高长银; 虞正平; 吴晓铃

    2013-01-01

    针对沥青混合料保温车螺旋输送机,从速度分析入手,应用数学方法推导出螺旋输送机的轴向运动速度和圆周速度,从而进一步推导出螺旋轴转速、螺旋叶片直径、螺旋螺距等计算公式,进而完成沥青混合料螺旋输送机参数设计.最后,运用工程流体力学软件EFD软件建立了螺旋输送机内物料流动分析模型,对沥青混合料流动过程进行数值模拟,结果表明,输送机工作时将能带动物料混合搅拌,但由于出口处空间限制,要靠螺旋面挤出卸料,应尽可能减少伸出尺寸.%For the screw conveyor of the asphalt mixture insulation vehicle,by means of the mathematical methods the axial movement speed and the circumferential speed of the screw conveyor are derived,and then the calculation formula of the spiral shaft rotation speed,helical blade diameter and pitch are deduced.According to the calculation formula,the design parameters of the screw conveyor of the asphalt mixture insulation vehicle are calculated.Finally,by using of Engineering Fluid Dynamics software the material flow analysis model of the screw conveyor is established,and the flow field of asphalt mixing material is simulated.The results show that the screw conveyor can stir and mix the materials,as a result of exit space limitation the material is dumped by screw extrusion and should minimize the extend size.The reference for the selection,design and optimization of the screw conveyor will be provided by the research results.

  2. Nodal-chain metals

    Science.gov (United States)

    Bzdušek, Tomáš; Wu, Quansheng; Rüegg, Andreas; Sigrist, Manfred; Soluyanov, Alexey A.

    2016-10-01

    The band theory of solids is arguably the most successful theory of condensed-matter physics, providing a description of the electronic energy levels in various materials. Electronic wavefunctions obtained from the band theory enable a topological characterization of metals for which the electronic spectrum may host robust, topologically protected, fermionic quasiparticles. Many of these quasiparticles are analogues of the elementary particles of the Standard Model, but others do not have a counterpart in relativistic high-energy theories. A complete list of possible quasiparticles in solids is lacking, even in the non-interacting case. Here we describe the possible existence of a hitherto unrecognized type of fermionic excitation in metals. This excitation forms a nodal chain—a chain of connected loops in momentum space—along which conduction and valence bands touch. We prove that the nodal chain is topologically distinct from previously reported excitations. We discuss the symmetry requirements for the appearance of this excitation and predict that it is realized in an existing material, iridium tetrafluoride (IrF4), as well as in other compounds of this class of materials. Using IrF4 as an example, we provide a discussion of the topological surface states associated with the nodal chain. We argue that the presence of the nodal-chain fermions will result in anomalous magnetotransport properties, distinct from those of materials exhibiting previously known excitations.

  3. CHAINE DES ROTISSEUR @ HILTON

    Institute of Scientific and Technical Information of China (English)

    2005-01-01

    The annual gala dinner of Chaine des Rotisseurs was hosted by Hilton Beijing. The “Ballet Dinner” - a great creation for both art and fine dining lovers was taken place in varies places within the hotel, including hotel lobby, 3rd floor and lobby lounge.

  4. Exploration Supply Chain Simulation

    Science.gov (United States)

    2008-01-01

    The Exploration Supply Chain Simulation project was chartered by the NASA Exploration Systems Mission Directorate to develop a software tool, with proper data, to quantitatively analyze supply chains for future program planning. This tool is a discrete-event simulation that uses the basic supply chain concepts of planning, sourcing, making, delivering, and returning. This supply chain perspective is combined with other discrete or continuous simulation factors. Discrete resource events (such as launch or delivery reviews) are represented as organizational functional units. Continuous resources (such as civil service or contractor program functions) are defined as enabling functional units. Concepts of fixed and variable costs are included in the model to allow the discrete events to interact with cost calculations. The definition file is intrinsic to the model, but a blank start can be initiated at any time. The current definition file is an Orion Ares I crew launch vehicle. Parameters stretch from Kennedy Space Center across and into other program entities (Michaud Assembly Facility, Aliant Techsystems, Stennis Space Center, Johnson Space Center, etc.) though these will only gain detail as the file continues to evolve. The Orion Ares I file definition in the tool continues to evolve, and analysis from this tool is expected in 2008. This is the first application of such business-driven modeling to a NASA/government-- aerospace contractor endeavor.

  5. Innovation in Supply Chains

    DEFF Research Database (Denmark)

    Maier, Maximilian; Korbel, Jakob; Brem, Alexander

    2015-01-01

    . Moreover, along with the fourth industrial revolution – industry 4.0 – new technologies such as cyber physical systems are fast gaining popularity. Hence, based on the analysis of relevant literature, we further develop the supply chain committee model, developed by Kaluza et al. (2003) to demonstrate how...

  6. Supply chain reliability modelling

    Directory of Open Access Journals (Sweden)

    Eugen Zaitsev

    2012-03-01

    Full Text Available Background: Today it is virtually impossible to operate alone on the international level in the logistics business. This promotes the establishment and development of new integrated business entities - logistic operators. However, such cooperation within a supply chain creates also many problems related to the supply chain reliability as well as the optimization of the supplies planning. The aim of this paper was to develop and formulate the mathematical model and algorithms to find the optimum plan of supplies by using economic criterion and the model for the probability evaluating of non-failure operation of supply chain. Methods: The mathematical model and algorithms to find the optimum plan of supplies were developed and formulated by using economic criterion and the model for the probability evaluating of non-failure operation of supply chain. Results and conclusions: The problem of ensuring failure-free performance of goods supply channel analyzed in the paper is characteristic of distributed network systems that make active use of business process outsourcing technologies. The complex planning problem occurring in such systems that requires taking into account the consumer's requirements for failure-free performance in terms of supply volumes and correctness can be reduced to a relatively simple linear programming problem through logical analysis of the structures. The sequence of the operations, which should be taken into account during the process of the supply planning with the supplier's functional reliability, was presented.

  7. The design of supply chains

    DEFF Research Database (Denmark)

    Bøge Sørensen, Lars

    2004-01-01

    Keywords Supply Chain Management, Supply Chain Design, Literature studyAbstract Argues stability is a design objective for supply chain design alongside cost, leadtime and responsiveness. Performs an extensive literature study on supply chain design,identifies methods, theories and objectives...... in the existing literature. Describes the conceptexternal specificity and how it's used to design supply chains. Using the concept upstream,archetypes of risk minimal and maximal design are identified. Downstream the conceptdescribes two viable scenarios, one minimizing the impact, the other minimizing...... theprobability of (intended) departure of a supply chain partner. Finally, principles for supplychain design are described and managerial outlined....

  8. Decision-Making for Supply Chain Integration Supply Chain Integration

    CERN Document Server

    Lettice, Fiona; Durowoju, Olatunde

    2012-01-01

    Effective supply chain integration, and the tight co-ordination it creates, is an essential pre-requisite for successful supply chain management.  Decision-Making for Supply Chain Integration is a practical reference on recent research in the area of supply chain integration focusing on distributed decision-making problems. Recent applications of various decision-making tools for integrating supply chains are covered including chapters focusing on: •Supplier selection, pricing strategy and inventory decisions in multi-level supply chains, •RFID-enabled distributed decision-making, •Operational risk issues and time-critical decision-making for sensitive logistics nodes, Modelling end to end processes to improve supply chain integration, and •Integrated systems to improve service delivery and optimize resource use. Decision-Making for Supply Chain Integration provides an insight into the tools and methodologies of this field with support from real-life case studies demonstrating successful application ...

  9. Comparison of sliding friction and wear behaviour of overhead conveyor steels tested under dry and lubrication conditions; Comportamiento frente al desgaste y friccion de aceros empleados en lineas de manutencion aerea ensayados con y sin lubricacion

    Energy Technology Data Exchange (ETDEWEB)

    Castro-Regal, G.; Fernandez-Vicente, A.; Martinez, M. A.

    2005-07-01

    The sliding friction and wear behaviour of different steel qualities were investigated with and without lubrication conditions. Steel qualities tested are normally used in the overhead conveyor system of many industrial fields, like the automotive sector. Sliding wear tests have been conducted by means of a pin-on-disk machine. A 100Cr6 steel similar to that used within the overhead conveyor trolleys has been employed as a pin. Friction coefficient values obtained under lubrication conditions were three times smaller than those obtained without lubrication. The mechanism that controls wear behaviour under lubrication conditions is an abrasive one and the wear values obtained are almost worthless. On the other hand, mechanism controlling wear during non lubrication tests, was a combination of abrasion and adhesion. (Author) 20 refs.

  10. 纳米材料在输送带覆盖胶中的应用研究进展%Study on Application of Nanometer Materials in the Covering Rubber of Conveyor Belt

    Institute of Scientific and Technical Information of China (English)

    臧亚南

    2014-01-01

    简要介绍了层状硅酸盐、纳米金属氧化物和氢氧化物在输送带覆盖胶中的应用,对各种纳米材料对输送带覆盖胶的性能影响进行了综述,并对今后的发展进行了展望。%The application of layered silicate, metal oxide nanocrystallines, nano -hydroxide in the covering rubber of conveyor belt were introduced. The properties of nanometer materials in the the covering rubber of conveyor belt were also summarized. And the future development was prospected.

  11. 长距离胶带机在水电工程砂石料系统工程中的应用%Application of Long-distance Rubber Belt Conveyor in Aggregate & Sand Processing System of Hydropower Projects

    Institute of Scientific and Technical Information of China (English)

    2015-01-01

    文章从长距离胶带机的设计、施工要求及在国内外各个工地的砂石料生产中的应用等方面,对长距离胶带机的使用进行综合性比较,论证了长距离胶机在水电工程中应用的推广意义。%Application of the long-distance rubber belt conveyor is comprehensively compared, and the development significance of the conveyor in the hydropower projects is demonstrated in terms of its design, construction requirements and its applications in the aggregate&sand processing operation on the hydropower projects site both at home and abroad.

  12. 高温水冷倾斜25°螺旋输送机的设计与应用%Design and Application of Water-cooled Screw Conveyor Inclined at 25°

    Institute of Scientific and Technical Information of China (English)

    王一冰; 杨志勇

    2015-01-01

    针对3 M W循环流化床锅炉岛系统热态试验台工程设计了高温水冷倾斜25°螺旋输送机。介绍了高温水冷倾斜25°螺旋输送机的主要参数、输送工艺和结构特点。%Aiming at the thermalstate test rig for boiler island system of 3 MW circulating fluidized bed ,we design a 25° inclined screw conveyor cooled by water .This paper introduces the main parameters ,process and structure features of the water‐cooled screw conveyor inclined at 25° .

  13. Analysis on Earth Conveying and Pressure Maintaining of Screw Conveyors of EPB Shields%土压平衡盾构螺旋输送机排土及保压作用分析

    Institute of Scientific and Technical Information of China (English)

    周冠南

    2012-01-01

    The earth conveying and pressure maintaining of screw conveyors play an important role in the safe and effi- cient boring of EPB shields. The working principles and influencing factors of the earth conveying and pressure maintai- ning of screw conveyors are systematically analyzed. Conclusions drawn are as follows : 1 ) The earth pressure balance in the boring of EPB shields includes the pressure balance between inside chamber and outside chamber, the pressure bal- ance inside the screw conveyor, and the earth input/output volume balance, which can be realized by controlling the volume of earth conveyed. 2) When the earth enters the screw conveyors, the water/soil pressure in the chamber is re- sisted by the gravity of the earth and the friction with the screw rod, lamina and the inner side of the conveyor, so as to keep stable earth conveying. 3 ) The earth behavior, which has great influence on the earth conveying and pressure maintaining of screw conveyors, can be improved by injecting ground conditioning agents into areas ahead of the cutter heads and into the chamber. 4) Regarding the structure of the screw conveyor, the pressure maintaining effect can be improved by means of reducing the pitch, adopting discontinuous screw and double screw conveyors.%螺旋输送机的排土和保压作用的发挥对土压平衡盾构的施工安全与效率有重要影响,对其作用机制及影响其作用发挥的因素进行系统的理论分析,并参考工程实测数据,得出以下结论:1)盾构施工中的土压平衡包括土仓内外与螺旋输送机内的压力平衡和进、出土量的平衡,其通过螺旋输送机排土量的控制来实现;2)渣土进入螺旋输送机后,依靠自身重力及与螺杆、叶片和筒壁界面间的摩擦作用来抵抗土仓内的水土压力,保持出渣过程的稳定性;3)渣土性质对螺旋输送机的排土和保压效果有较大影响,主要通过向刀盘前方和土仓内添加改良材料的

  14. 硅铁除尘系统中螺旋输灰机构参数的选择%SELECTION OF PARAMETERS OF SCREW CONVEYOR IN BAG HOUSE DUST COLLECTOR IN FeSi FURNACE

    Institute of Scientific and Technical Information of China (English)

    卢鹏翔

    2001-01-01

    The screw conveyor was adopted in bag house dust collector in 12.5MVA FeSi furnace,and its parameters were calculated and selected.The practice showed that the screw conveyor runned well,the service effect was good.%12.5MVA硅铁炉布袋反吸烟气净化系统中采用了螺旋输灰机构,并对输灰机构的参数进行了计算和选择。经生产中使用,螺旋输灰机运行良好,取得了较好的使用效果。

  15. Current methods and possibilities to determine the variability of Cu content in the copper ore on a conveyor belt in one of KGHM Polska Miedz S.A. mines

    Directory of Open Access Journals (Sweden)

    Jurdziak Leszek

    2016-01-01

    Full Text Available In this paper the methodology of ore sampling on a belt conveyor in one of KGHM Polska Miedz S.A. mines was presented together with the results of analysis of the variation of ore tonnage and quality. The ore was transferred from one mine to another one through the analysed transfer conveyor on the route from the mine Division of Mining to copper plants. The transported ore was sampled in person from Division of Concentrators on a regular basis for metal accounting purposes between both mines. The ore quality control became a significant problem since it is impossible to predict with satisfactory advance both Cu content in the feed as well as its lithology composition which is required to improve and optimise the enrichment efficiency.

  16. Towards Intelligent Supply Chains

    DEFF Research Database (Denmark)

    Siurdyban, Artur; Møller, Charles

    2012-01-01

    applied to the context of organizational processes can increase the success rate of business operations. The framework is created using a set of theoretical based constructs grounded in a discussion across several streams of research including psychology, pedagogy, artificial intelligence, learning...... of deploying inapt operations leading to deterioration of profits. To address this problem, we propose a unified business process design framework based on the paradigm of intelligence. Intelligence allows humans and human-designed systems cope with environmental volatility, and we argue that its principles......, business process management and supply chain management. It outlines a number of system tasks combined in four integrated management perspectives: build, execute, grow and innovate, put forward as business process design propositions for Intelligent Supply Chains....

  17. Perioperative supply chain management.

    Science.gov (United States)

    Feistritzer, N R; Keck, B R

    2000-09-01

    Faced with declining revenues and increasing operating expenses, hospitals are evaluating numerous mechanisms designed to reduce costs while simultaneously maintaining quality care. Many facilities have targeted initial cost reduction efforts in the reduction of labor expenses. Once labor expenses have been "right sized," facilities have continued to focus on service delivery improvements by the optimization of the "supply chain" process. This report presents a case study of the efforts of Vanderbilt University Medical Center in the redesign of its supply chain management process in the department of Perioperative Services. Utilizing a multidisciplinary project management structure, 3 work teams were established to complete the redesign process. To date, the project has reduced costs by $2.3 million and enhanced quality patient care by enhancing the delivery of appropriate clinical supplies during the perioperative experience.

  18. Volumes of chain links

    CERN Document Server

    Kaiser, James; Rollins, Clint

    2011-01-01

    Agol has conjectured that minimally twisted n-chain links are the smallest volume hyperbolic manifolds with n cusps, for n at most 10. In his thesis, Venzke mentions that these cannot be smallest volume for n at least 11, but does not provide a proof. In this paper, we give a proof of Venzke's statement. The proof for n at least 60 is completely rigorous. The proof for n between 11 and 59 uses a computer calculation, and can be made rigorous for manifolds of small enough complexity, using methods of Moser and Milley. Finally, we prove that the n-chain link with 2m or 2m+1 half-twists cannot be the minimal volume hyperbolic manifold with n cusps, provided n is at least 60 or |m| is at least 8, and we give computational data indicating this remains true for smaller n and |m|.

  19. Extended linear chain compounds

    CERN Document Server

    Linear chain substances span a large cross section of contemporary chemistry ranging from covalent polymers, to organic charge transfer com­ plexes to nonstoichiometric transition metal coordination complexes. Their commonality, which coalesced intense interest in the theoretical and exper­ imental solid state physics/chemistry communities, was based on the obser­ vation that these inorganic and organic polymeric substrates exhibit striking metal-like electrical and optical properties. Exploitation and extension of these systems has led to the systematic study of both the chemistry and physics of highly and poorly conducting linear chain substances. To gain a salient understanding of these complex materials rich in anomalous aniso­ tropic electrical, optical, magnetic, and mechanical properties, the conver­ gence of diverse skills and talents was required. The constructive blending of traditionally segregated disciplines such as synthetic and physical organic, inorganic, and polymer chemistry, crystallog...

  20. The innovation value chain.

    Science.gov (United States)

    Hansen, Morten T; Birkinshaw, Julian

    2007-06-01

    The challenges of coming up with fresh ideas and realizing profits from them are different for every company. One firm may excel at finding good ideas but may have weak systems for bringing them to market. Another organization may have a terrific process for funding and rolling out new products and services but a shortage of concepts to develop. In this article, Hansen and Birkinshaw caution executives against using the latest and greatest innovation approaches and tools without understanding the unique deficiencies in their companies' innovation systems. They offer a framework for evaluating innovation performance: the innovation value chain. It comprises the three main phases of innovation (idea generation, conversion, and diffusion) as well as the critical activities performed during those phases (looking for ideas inside your unit; looking for them in other units; looking for them externally; selecting ideas; funding them; and promoting and spreading ideas companywide). Using this framework, managers get an end-to-end view of their innovation efforts. They can pinpoint their weakest links and tailor innovation best practices appropriately to strengthen those links. Companies typically succumb to one of three broad "weakest-link" scenarios. They are idea poor, conversion poor, or diffusion poor. The article looks at the ways smart companies - including Intuit, P&G, Sara Lee, Shell, and Siemens- modify the best innovation practices and apply them to address those organizations' individual needs and flaws. The authors warn that adopting the chain-based view of innovation requires new measures of what can be delivered by each link in the chain. The approach also entails new roles for employees "external scouts" and "internal evangelists," for example. Indeed, in their search for new hires, companies should seek out those candidates who can help address particular weaknesses in the innovation value chain.

  1. Monitoring Global Supply Chains

    OpenAIRE

    2014-01-01

    Firms reliant on supply chains to manufacture their goods risk reputational harm if the working conditions in those factories are revealed to be dangerous, illegal, or otherwise problematic. While firms are increasingly relying on private-sector "social auditors" to assess factory conditions, little had been known about the accuracy of those assessments. We analyzed nearly 17,000 code-of-conduct audits conducted at nearly 6,000 suppliers around the world. We found that audits yield fewer viol...

  2. Port supply chain integration : analyzing biofuel supply chains

    NARCIS (Netherlands)

    Stevens, Leonie C. E.; Vis, Iris F. A.

    2016-01-01

    This paper focuses on port supply chain integration to strengthen operational and business performance. We provide a structured and comprehensive method to enable port supply chain integration and demonstrate its applicability to the biofuel supply chain. We define the value proposition, role, activ

  3. DSJ100/100/3×200型顺槽带式输送机的研制%Development of DSJ1 00/1 00/3 ×200 Type Belt Conveyor

    Institute of Scientific and Technical Information of China (English)

    赵世旭

    2014-01-01

    Aiming at the transportation requirements of special roadway and universality of series product in Xis-han coal and electricity (group)company,on the basis of digestion and absorption the experience of traditional belt conveyor,through optimization design of the existing DSJ100 series tunnel extensible belt conveyor in Xishan coal and electricity group electromechanical factory,a new kind of belt conveyor is developed,which is safe,reliable and en-ergy saving.Introduces through adopting the key techniques such as variable frequency conversion start mode,the new integral base,unloading intermediate drive,the fast disassembly fuselage and so on,adaptability,safety reliabili-ty and economy of belt conveyor to severe environment in the underground of coal mine is improved effectively.%针对西山煤电(集团)公司矿井特殊巷道运输要求和产品系列的通用性,在消化和吸收传统顺槽带式输送机经验的基础上,对西山机电厂现有DSJ100系列顺槽可伸缩带式输送机进行了优化设计,研制开发出了一种安全、可靠、节能的新型带式输送机。介绍了通过采用变频调速启动方式、新式整体底座、卸载式中间驱动、快速可拆卸机身等关键技术,有效提高了带式输送机对煤矿井下恶劣环境的适应能力、安全可靠性及经济性。

  4. The Design of PLC Control Programs of Screens and Spiral Conveyors%格栅除污机及螺旋输送机PLC控制程序设计

    Institute of Scientific and Technical Information of China (English)

    谢凯; 袁鹏; 王明军

    2011-01-01

    本文分析了污水提升泵站格栅除污机及螺旋输送机自动控制运行原理,以西门子S7-300系列PLC为例,设计出了PLC控制程序.%This paper analy es the automatic operation principle of screens and spiral conveyors at wastewater pumping stations,designs the PLC control programs based on S7-300 of Siemens.

  5. Design and Application of New High-pressure Sealing Screw Conveyor%新型高压密封螺旋输送机的设计与应用

    Institute of Scientific and Technical Information of China (English)

    杨丽珍; 钟少振; 张晓冬

    2011-01-01

    螺旋输送机主要用于输送各种粉状、粒状、小块状等散状物料,常用于食品、化工、煤炭、建筑 及冶炼等工业.随着新工艺新技术的发展,在化工及冶炼行业常伴有高压有毒有害气体,对螺旋输送机性能提出了新的要求.天津赛瑞机器设备有限公司为满足市场需求研发出一种适用于输送过程中伴有高压及密封要求的新型高压密封螺旋输送机.本文介绍了该高压密封螺旋输送机的主要参数、输送工艺和结构技术特点.%High-pressure sealing screw conveyor is a kind of machine for carrying materials of a variety of powder,grain and little nub, which is common in the industries of food, chemistry, coal, construction and smelting. Gencrally is accompanied with high pressure noxious gas in chemistry and smelting industry, the development of new process and technology new demands of screw conveyor's performance will be occurred. Our company researched and designed a new type of highpressure sealing screw conveyor with requirements of high-pressure and sealing to satisfy market's demand. The paper introduced the main parameter, carrying process and structure specifics of high-pressure sealing screw conveyor.

  6. 水峪煤业主斜井带式输送机盘式制动器改造应用研究%Applied research on disk brake for belt conveyor on main inclined shaft on Shuiyu coal

    Institute of Scientific and Technical Information of China (English)

    杨贵生

    2014-01-01

    In order to ensure the safe operation of main shaft belt conveyor, on the basis of analyzing the existing disc brake pump and electric control device and the existing problems, combined with Shuiyu Coal Mine Inclined Belt Conveyor's parameters and the actual operating conditions, put forward the advanced reconstruction scheme for the pump station of the conveyor of disc brake main shaft that used N+1 circuit braking system, instantaneous working system, and made the transformation with the electronic control device together. By the transformation of the system, and ensure safe and stable operation.%为了保证主斜井带式输送的安全运行,在充分分析现有盘式制动泵站和电控装置存在问题的基础上,结合水峪煤业主斜井带式输送的参数及实际运行工况,提出主斜井带式输送机盘式制动器泵站为N+1回路制动系统、瞬时工作制等先进改造方案,并对电控装置一并改造。通过改造保证系统安全可靠稳定运行。

  7. 井下B1000带宽带式输送机传动部受力分析%Stress Analysis of Underground B1000 Broadband Belt Conveyor Drive Unit

    Institute of Scientific and Technical Information of China (English)

    马雁翔

    2013-01-01

    First broadband meter belt conveyor, for instance describes the design parameters of the belt conveyor, and the spread portion of the structure. Secondly, the size of the load on the drive the bear were calculated. Finally, the Ministry of transmission through finite element analysis software force analysis of each component strength of the belt conveyor drive unit for check verification theory, provide a reference for future manufacturing.%  首先以带宽一米的带式输送机为实例介绍带式输送机的设计参数,以及传动部的结构。其次,对传动部的承受载荷的大小进行了计算。最后,通过有限元分析软件对传动部进行了受力分析,从理论上对带式输送机传动部各部件强度进行校核验证,为以后的生产制造提供参考依据。

  8. Discussion on Energy Saving of Converter Used in Belt Conveyor in Coal Mine%关于煤矿皮带机变频器节能的探究

    Institute of Scientific and Technical Information of China (English)

    胡晨飞

    2015-01-01

    Coal belt conveyor has relations with the transport of coal supplies and reduction losses in transport, and extending the life of the belt and so on, which has important significance for the mine development. In view of this, this paper mainly researched on energy-saving of converter used in belt conveyor in coal mine in order to deepen understanding of the coal belt drive, and improve application quality of coal belt conveyor.%煤矿皮带机关系着原煤物资运输、降低运输过程中的损耗、延长皮带使用寿命等,对煤矿发展具有重要的意义。鉴于此,主要就煤矿皮带机变频器节能进行研究,希望加深对煤矿皮带变频器的了解,提升煤矿皮带机的应用质量。

  9. Adjustable chain trees for proteins

    DEFF Research Database (Denmark)

    Winter, Pawel; Fonseca, Rasmus

    2012-01-01

    A chain tree is a data structure for changing protein conformations. It enables very fast detection of clashes and free energy potential calculations. A modified version of chain trees that adjust themselves to the changing conformations of folding proteins is introduced. This results in much...... tighter bounding volume hierarchies and therefore fewer intersection checks. Computational results indicate that the efficiency of the adjustable chain trees is significantly improved compared to the traditional chain trees....

  10. Supply chain dynamics in Asia

    OpenAIRE

    Banomyong, Ruth

    2010-01-01

    Supply chain management in Asia is a relatively novel topic but a key challenge for all Asian based manufacturers and traders when trying to integrate into the "global market". The purpose of the paper is to describe key supply chain issues faced in Asia. These issues are related to supply chain security that forces Asian firms to comply with numerous requirements as well as the importance of a properly managed supply chain in enhancing firms' competitiveness. The critical role played by Asia...

  11. Requirements of supply chain management in differentiating European pork chains.

    Science.gov (United States)

    Trienekens, Jacques; Wognum, Nel

    2013-11-01

    This paper summarizes results obtained by research into pork chain management in the EU Integrated Project Q-Porkchains. Changing demands for intrinsic and extrinsic quality attributes of pork products impact the way supply chain management should be organized from the farmer down to the consumer. The paper shows the importance of Quality Management Systems for integrating supply chains and enhancing consumer confidence. The paper also presents innovations in information system integration for aligning information exchange in the supply chain and logistics concepts based on innovative measurement technologies at the slaughterhouse stage. In the final section research challenges towards sustainable pork supply chains satisfying current consumer demands are presented.

  12. On chains of centered valuations

    Directory of Open Access Journals (Sweden)

    Rachid Chibloun

    2003-01-01

    Full Text Available We study chains of centered valuations of a domain A and chains of centered valuations of A [X1,…,Xn] corresponding to valuations of A. Finally, we make some applications to chains of valuations centered on the same ideal of A [X1,…,Xn] and extending the same valuation of A.

  13. Designing structural supply chain flexibility

    NARCIS (Netherlands)

    Mulinski, Ksawery Jan

    2012-01-01

    In a continuously changing business environment the role of supply chain flexibility is constantly increasing. A flexible supply chain can ensure survival in quickly changing market conditions as well as enable sustainable growth. This thesis explores the topic of supply chain flexibility with focus

  14. Power Consumption and Experimental Study of Maize Straw Screw Conveyor%螺旋输送装置输送玉米秸秆功耗研究

    Institute of Scientific and Technical Information of China (English)

    乌兰图雅; 王春光; 谢胜仕; 赵圆圆

    2015-01-01

    In order to reduce the power consumption of the screw conveyor and increase its conveying efficiency , the the-oretical analyzing method and experimental research were used to establish the mathematical models of the power con -sumption which suitable for the different conveying state .The effects of screw rotational speeds and the feeding rates on power consumption and productivity ratio were studied by experimental study .The results show that the conveying power consumption increases 5~9 W when the rotational speed increased 10 r/min ( filling rate is fixed value ) , and the conve-ying power consumption increases 10~12W when the filling rate increased 0.1kg/s(rotational speed is fixed value).The experimental results still prove that the screw conveyor has the highest productivity ratio :0 .704~0 .714 kg/W when the moisture content of material is 24%, the rotational speed and filling rate are 120r/min and 0.88kg/s respectively.At the same time , the mechanical properties of materials to be delivered with the change of moisture content and the effects of moisture content on the power consumption were studied .The results show that the sliding friction angle increases 3 °~5 ° when the moisture content of material is increased 10%.And the internal friction angle increase first and then decreased along with the increasing of moisture content ,and the power consumption of the screw conveyor increased 7~9 W under certain filling rate and rotational speed .%为了降低螺旋输送装置的输送功耗,提高输送效率,通过理论分析和试验研究,建立了不同输送条件下螺旋输送粗饲料功耗的数学模型,试验研究了螺旋转速及喂入量对输送装置的输送功耗和比能产量的影响。试验结果表明:转速每增加10r/min(喂入量为定值),输送装置的输送功耗增大5~9W,喂入量每增加0.1kg/s (转速为定值),输送功耗增大10~12 W;同时得知:输送含水率约24%的揉

  15. Radiology's value chain.

    Science.gov (United States)

    Enzmann, Dieter R

    2012-04-01

    A diagnostic radiology value chain is constructed to define its main components, all of which are vulnerable to change, because digitization has caused disaggregation of the chain. Some components afford opportunities to improve productivity, some add value, while some face outsourcing to lower labor cost and to information technology substitutes, raising commoditization risks. Digital image information, because it can be competitive at smaller economies of scale, allows faster, differential rates of technological innovation of components, initiating a centralization-to-decentralization technology trend. Digitization, having triggered disaggregation of radiology's professional service model, may soon usher in an information business model. This means moving from a mind-set of "reading images" to an orientation of creating and organizing information for greater accuracy, faster speed, and lower cost in medical decision making. Information businesses view value chain investments differently than do small professional services. In the former model, producing a better business product will extend image interpretation beyond a radiologist's personal fund of knowledge to encompass expanding external imaging databases. A follow-on expansion with integration of image and molecular information into a report will offer new value in medical decision making. Improved interpretation plus new integration will enrich and diversify radiology's key service products, the report and consultation. A more robust, information-rich report derived from a "systems" and "computational" radiology approach will be facilitated by a transition from a professional service to an information business. Under health care reform, radiology will transition its emphasis from volume to greater value. Radiology's future brightens with the adoption of a philosophy of offering information rather than "reads" for decision making. Staunchly defending the status quo via turf wars is unlikely to constitute a

  16. Supply Chain Costing

    DEFF Research Database (Denmark)

    Asmussen, Jesper Normann; Kristensen, Jesper; Wæhrens, Brian Vejrum

    2016-01-01

    Based Costing (ABC) på et forsyningskædeniveau – heri benævnt Supply Chain Costing (SCC). Udoverdefordelederfindesved ABCtilføjerSCCogså et økonomisk grundlag til det strategiske rationale, der ofte ligger bag opbygningen af virksomhedens forsyningskæde, og kan dermed medvirke til konkret....... Virksomhedens evne til at udarbejde relevantinformation fremstår derfor som en vigtig parameter, såfremt virksomheden skal forblive konkurrencedygtig i en stadig mere kompleks verden, hvor udviklingen foregår stadig hurtigere. Denne arbejdsboggiverindsigtidemuligheder,der eksisterer ved at anvende Activity...

  17. 带式输送机机头硐室改造及远距离卸载臂的研制%Reconstruction of Belt Conveyor Driving Head Chamber and Research & Development on Long-Distance Unloading Boom

    Institute of Scientific and Technical Information of China (English)

    王天平

    2012-01-01

    According to the belt conveyor hard to start due to the heavy load, the slipping of the conveying belt, temperature rising of the electric motor and other problems caused by the high conveying slope of the fully mechanized coal mining face and the unleveled designed gateway, based on the driving head structure of the belt conveyor as basis, the driving head chamber was designed for the belt conveyor and a new plan of the reconstruction was provided for the discharging unit of the driving head. Thus the inclined drop driving head cham- ber and the long distance discharging arm, with the reduction of the manufactured height of the installed platform in the driving head chamber of the belt conveyor, thus could reduce the slope of the buffer section in the large framework of the driving head of the belt con- veyor and the height of the large framework driving section could be reduced and the operation performances of the belt conveyor could not be affected. Meanwhile the application to the actual coal mining face had confirmed the applied value.%针对综采工作面运输坡度较大及巷道设计不平整等引发的带式输送机重载无法启动、输送带打滑、电机温度升高等问题,提出了以带式输送机机头结构为基准,设计带式输送机机头硐室并对机头卸载部进行改造的新方案,即倾斜落差式机头硐室和远距离卸载臂,通过降低带式输送机机头硐室安装平台的施工高度,从而降低带式输送机机头大架缓冲段的坡度,实现了大架传动部分降低高度安装而不影响带式输送机运行性能,同时通过实际工作面的应用验证了其实用价值。

  18. [Trophic chains in soil].

    Science.gov (United States)

    Goncharov, A A; Tiunov, A V

    2013-01-01

    Trophic links of soil animals are extensively diverse but also flexible. Moreover, feeding activity of large soil saprotrophs often cascades into a range of ecosystem-level consequences via the ecological engineering. Better knowledge on the main sources of energy utilized by soil animals is needed for understanding functional structure of soil animal communities and their participation in the global carbon cycling. Using published and original data, we consider the relative importance of dead organic matter and saprotrophic microorganisms as a basal energy source in the detritus-based food chains, the feeding of endogeic macrofauna on the stabilized soil organic matter, and the role of recent photosynthate in the energy budget of soil communities. Soil food webs are spatially and functionally compartmentalized, though the separation of food chains into bacteria- and fungi-based channels seems to be an over-simplification. The regulation of the litter decomposition rates via top-down trophic interactions across more than one trophic level is only partly supported by experimental data, but mobile litter-dwelling predators play a crucial role in integrating local food webs within and across neighboring ecosystems.

  19. Polyketide chain length control by chain length factor.

    Science.gov (United States)

    Tang, Yi; Tsai, Shiou-Chuan; Khosla, Chaitan

    2003-10-22

    Bacterial aromatic polyketides are pharmacologically important natural products. A critical parameter that dictates product structure is the carbon chain length of the polyketide backbone. Systematic manipulation of polyketide chain length represents a major unmet challenge in natural product biosynthesis. Polyketide chain elongation is catalyzed by a heterodimeric ketosynthase. In contrast to homodimeric ketosynthases found in fatty acid synthases, the active site cysteine is absent from the one subunit of this heterodimer. The precise role of this catalytically silent subunit has been debated over the past decade. We demonstrate here that this subunit is the primary determinant of polyketide chain length, thereby validating its designation as chain length factor. Using structure-based mutagenesis, we identified key residues in the chain length factor that could be manipulated to convert an octaketide synthase into a decaketide synthase and vice versa. These results should lead to novel strategies for the engineered biosynthesis of hitherto unidentified polyketide scaffolds.

  20. Evaluation of variations in CO2 gas exchange in the atmosphere of the BTLSS with plants grown in a conveyor mode on the soil-like substrate

    Science.gov (United States)

    Velichko, Vladimir; Tikhomirov, Alexander A.; Tikhomirova, Natalia; Ushakova, Sofya

    2016-07-01

    The soil-like substrate (SLS) included in the bioregenerative life support system (BLSS) exerts a substantial effect on its gas exchange. This effect is determined by the non-uniform rate of organic matter degradation in the SLS, on the one hand, and by the variable intensity of photosynthesis of the plants grown on it, on the other. The purpose of this study was to compare CO2 variations in the atmosphere of the higher plants - SLS system at different intervals in uneven-aged higher plant conveyers. The study showed that CO2 concentration could reach and exceed the levels of atmospheric carbon dioxide acceptable for humans (over 1%) even when the conveyer interval was rather short. CO2 variations in the atmosphere of the higher plants - SLS system were determined not only by the frequency of adding plant waste to the SLS and the mass of the waste but also by the amount of the harvested actively photosynthesizing plant biomass. At the same time, no significant differences were found in the mineral and production components between the plants in different experiments. Results of the study can be used to optimize the conveyor interval and the associated effectiveness of mineralization of the plant waste added to the SLS and to stabilize the CO2 gas exchange. This study was carried out in the IBP SB RAS and supported by the grant of the Russian Science Foundation (Project No. 14-14-00599).

  1. Analysis on Oil Seal Leakage for Sprocket Assembly of Armored Face Conveyors%刮板输送机链轮轴组油封漏油分析

    Institute of Scientific and Technical Information of China (English)

    朱秀梅

    2014-01-01

    Armored face conveyor works in bad environment.Its floating oil seal installed in sprocket assembly is always failed and causes oil leakage,which may cause the lubricating oil waste and pollute the work environment,and even cause the damage of the bearing inside sprocket assembly.Various factors caused seal failure were analyzed from the quality of sprocket assembly floating oil seal,component installation,the habits of users and other aspects.It has a certain reference role to improve the seal reliability in sprocket assembly.%刮板输送机工作环境恶劣,其链轮轴组的浮动油封经常失效导致漏油,轻则造成润滑油浪费、工作环境被污染,重则导致链轮轴组内轴承损坏。从链轮轴组浮动油封自身质量、组件安装、用户使用等各环节对造成密封失效的各种因素进行分析,对提高链轮轴组密封可靠性有一定参考作用。

  2. 粒煤螺旋输送特性实验研究%Screw conveying characteristics of granular coal from screw conveyor

    Institute of Scientific and Technical Information of China (English)

    陈汝超; 陈晓平; 蔡佳莹; 刘道银; 梁财

    2012-01-01

    The screw conveying characteristics of granular coal from an screw conveyor was investigated.The results show that coal particle size,moisture content and conveying angle have significant effects on the screw conveying characteristics of granular coal.Screw velocity increases with the increasing of particle size of granular coal and decreases with the increasing of moisture content of granular coal.Increasing the conveying angle leads to serious sliding of the granular coal,and the filling coefficient increases.The filling coefficient increases with the increasing of particle size and moisture content of granular coal.%在自行设计的粒煤螺旋输送系统上对粒煤的螺旋输送特性进行了研究。结果表明:粒煤的粒径、外水分及螺旋倾角对其输送特性有显著影响。粒煤的平均粒径越大,外水分越小,其输送速率越大;螺旋倾角越大,输送过程中物料的滑移现象越严重,填充系数越大;粒煤的外水分越大,平均粒径越大,输送过程中的填充系数越大。

  3. New Canonic Active RC Sinusoidal Oscillator Circuits Using Second-Generation Current Conveyors with Application as a Wide-Frequency Digitally Controlled Sinusoid Generator

    Directory of Open Access Journals (Sweden)

    Abhirup Lahiri

    2011-01-01

    Full Text Available This paper reports two new circuit topologies using second-generation current conveyors (CCIIs for realizing variable frequency sinusoidal oscillators with minimum passive components. The proposed topologies in this paper provide new realizations of resistance-controlled and capacitor-controlled variable frequency oscillators (VFOs using only four passive components. The first topology employs three CCIIs, while the second topology employs two CCIIs. The second topology provides an advantageous feature of frequency tuning through two grounded elements. Application of the proposed circuits as a wide-frequency range digitally controlled sinusoid generator is exhibited wherein the digital frequency control has been enabled by replacing both the capacitors by two identical variable binary capacitor banks tunable by means of the same binary code. SPICE simulations of the CMOS implementation of the oscillators using 0.35 μm TSMC CMOS technology parameters and bipolar implementation of the oscillators using process parameters for NR200N-2X (NPN and PR200N-2X (PNP of bipolar arrays ALA400-CBIC-R have validated their workability. One of the oscillators (with CMOS implementation is exemplified as a digitally controlled sinusoid generator with frequency generation from 25 kHz to 6.36 MHz, achieved by switching capacitors and with power consumption of 7 mW in the entire operating frequency range.

  4. Information in the supply chain: measuring supply chain performance

    OpenAIRE

    Bytheway, Andrew

    1995-01-01

    Information is one of many factors in the development of supply chain operations. It is a key factor in a number of new initiatives, such as: business process management. partnership development, efficient customer response, tighter integration of supply chain operations and outsourcing of ancillary operations. Improvement of the supply chain takes place at different levels: simple efficiency (the Improvement of existing processes), improved quality of service (the redesign of ...

  5. Doping of Semiconducting Atomic Chains

    Science.gov (United States)

    Toshishige, Yamada; Kutler, Paul (Technical Monitor)

    1997-01-01

    Due to the rapid progress in atom manipulation technology, atomic chain electronics would not be a dream, where foreign atoms are placed on a substrate to form a chain, and its electronic properties are designed by controlling the lattice constant d. It has been shown theoretically that a Si atomic chain is metallic regardless of d and that a Mg atomic chain is semiconducting or insulating with a band gap modified with d. For electronic applications, it is essential to establish a method to dope a semiconducting chain, which is to control the Fermi energy position without altering the original band structure. If we replace some of the chain atoms with dopant atoms randomly, the electrons will see random potential along the chain and will be localized strongly in space (Anderson localization). However, if we replace periodically, although the electrons can spread over the chain, there will generally appear new bands and band gaps reflecting the new periodicity of dopant atoms. This will change the original band structure significantly. In order to overcome this dilemma, we may place a dopant atom beside the chain at every N lattice periods (N > 1). Because of the periodic arrangement of dopant atoms, we can avoid the unwanted Anderson localization. Moreover, since the dopant atoms do not constitute the chain, the overlap interaction between them is minimized, and the band structure modification can be made smallest. Some tight-binding results will be discussed to demonstrate the present idea.

  6. Dynamics of Polymer Chains.

    Science.gov (United States)

    Hong, Tzay-Ming

    A major objective of this research is to establish at a more fundamental level some of the qualitative or semi-quantitative treatments in use at the present time, such as the Doi-Edwards tube picture, the switch from non -ideal to ideal behavior, and dynamical aspects of the reptation model. The main topics are: (I) An attempt was made to determine the order of magnitude of the elastic time interval of a viscoelastic polymer melt, defining it as the reciprocal of the average rate at which the total entanglement (clockwise plus anticlockwise) passes through zero due to thermal agitation. We calculated the case of a free chain winding about a straight rod both in friction-independent regime and in high friction regime. (II) By successively coarse -graining and rescaling the monomer-monomer interaction (using a modified Wilson recursion formula) we found that the interaction is driven to a very strong but short-ranged one. This verifies the observation that polymers in dilute solutions tend to curl up and behave like hard spheres. (III) We studied the case of chemical equilibrium of i-mers with their nucleating monomers and on the basis of a Flory-Huggins -type mean field theory find that in the dilute limit the swelling of the i-mers takes on the traditional N ^{3over5} law only for sufficiently small monomer chemical potential. When that potential is large enough, then, assuming a Flory law of chain propagation, the law seems to become N^{1over3 }. This is distinct from the problem of changeover from dilute to semidilute polymer system, which we also studied by imposing total polymer density as a constraint equation. (IV) Another item examined concerns the form of the space curve that a very long polymer must assume in order to minimize its free energy (we found that a family of helices with a definite functional relation between pitch and radius renders the free energy stationary). Because a chain is a one-dimensional object, this does not mean that helical shapes

  7. Quivers via anomaly chains

    Energy Technology Data Exchange (ETDEWEB)

    Casero, Roberto [Dipartimento di Fisica, Universita di Milano-Bicocca, Piazza della Scienza, 3, 20126 Milan (Italy)]. E-mail: roberto.casero@mib.infn.it; Trincherini, Enrico [Dipartimento di Fisica, Universita di Milano-Bicocca, Piazza della Scienza, 3, 20126 Milan (Italy)

    2003-09-01

    We study quivers in the context of matrix models. We introduce chains of generalized Konishi anomalies to write the quadratic and cubic equations that constrain the resolvents of general affine A-circumflex{sub n-1} and non-affine A{sub n} quiver gauge theories, and give a procedure to calculate all higher-order relations. For these theories we also evaluate, as functions of the resolvents, VEV's of chiral operators with two and four bi-fundamental insertions. As an example of the general procedure we explicitly consider the two simplest quivers A{sub 2} and A-circumflex{sub 1}, obtaining in the first case a cubic algebraic curve, and for the affine theory the same equation as that of U(N) theories with adjoint matter, successfully reproducing the RG cascade result. (author)

  8. Quivers via anomaly chains

    CERN Document Server

    Casero, R; Casero, Roberto; Trincherini, Enrico

    2003-01-01

    We study quivers in the context of matrix models. We introduce chains of generalized Konishi anomalies to write the quadratic and cubic equations that constrain the resolvents of general affine and non-affine quiver gauge theories, and give a procedure to calculate all higher-order relations. For these theories we also evaluate, as functions of the resolvents, VEV's of chiral operators with two and four bifundamental insertions. As an example of the general procedure we explicitly consider the two simplest quivers A2 and A1(affine), obtaining in the first case a cubic algebraic curve, and for the affine theory the same equation as that of U(N) theories with adjoint matter, successfully reproducing the RG cascade result.

  9. NNSA TRITIUM SUPPLY CHAIN

    Energy Technology Data Exchange (ETDEWEB)

    Wyrick, Steven [Savannah River National Laboratory, Aiken, SC, USA; Cordaro, Joseph [Savannah River National Laboratory, Aiken, SC, USA; Founds, Nanette [National Nuclear Security Administration, Albuquerque, NM, USA; Chambellan, Curtis [National Nuclear Security Administration, Albuquerque, NM, USA

    2013-08-21

    Savannah River Site plays a critical role in the Tritium Production Supply Chain for the National Nuclear Security Administration (NNSA). The entire process includes: • Production of Tritium Producing Burnable Absorber Rods (TPBARs) at the Westinghouse WesDyne Nuclear Fuels Plant in Columbia, South Carolina • Production of unobligated Low Enriched Uranium (LEU) at the United States Enrichment Corporation (USEC) in Portsmouth, Ohio • Irradiation of TPBARs with the LEU at the Tennessee Valley Authority (TVA) Watts Bar Reactor • Extraction of tritium from the irradiated TPBARs at the Tritium Extraction Facility (TEF) at Savannah River Site • Processing the tritium at the Savannah River Site, which includes removal of nonhydrogen species and separation of the hydrogen isotopes of protium, deuterium and tritium.

  10. PHONONS IN POLYACENIC CHAINS

    Institute of Scientific and Technical Information of China (English)

    O. Rafil; M. Tamine; B. Bourahla; R. Tigrine; S. Amoudache; A. Khater

    2006-01-01

    We have theoretically resolved phonon excitations in quasi-two-dimensional organic crystals of polyacenic semiconductor material which may be obtained by the pyrolytic treatment of phenol-formaldehyde resin. A model for studying the dynamical properties using three polyacene chains is proposed with the aim to present the vibrational properties of this structure. It employs the formalism of solid states in two dimensions which admit phonons. A simulation process of the two-dimensional lattice structure shows that elastic waves may explain the existence of vibrational modes in the frequency range 100-400 cm-1. The presence of acoustic and optical like phonons is discussed in terms of the elastic force constants. A hyperfine resonance structure is obtained. It allows the analysis of the dynamical evolution in thin films of polyacene. It is found that the behavior of the phonon density of states exhibits resonance between modes in the structure.

  11. Chains, bombs, potrzebies and slugs

    Science.gov (United States)

    Jewess, Mike; McDowell, Alex; Maxfield, Stephen; Hunt, A. G.; Hicks, Bruce

    2010-03-01

    I read with pleasure Robert Crease's article on unusual units (February pp17-19). However, the article stated that an acre is 10×10 chains, when it is in fact 10×1 chains. Incidentally, a distance of 10 chains (220 yards) is known as a furlong, a word that suggests the length of a ploughed furrow and that is still used in horse-racing.

  12. DOS cones along atomic chains

    Science.gov (United States)

    Kwapiński, Tomasz

    2017-03-01

    The electron transport properties of a linear atomic chain are studied theoretically within the tight-binding Hamiltonian and the Green’s function method. Variations of the local density of states (DOS) along the chain are investigated. They are crucial in scanning tunnelling experiments and give important insight into the electron transport mechanism and charge distribution inside chains. It is found that depending on the chain parity the local DOS at the Fermi level can form cone-like structures (DOS cones) along the chain. The general condition for the local DOS oscillations is obtained and the linear behaviour of the local density function is confirmed analytically. DOS cones are characterized by a linear decay towards the chain which is in contrast to the propagation properties of charge density waves, end states and Friedel oscillations in one-dimensional systems. We find that DOS cones can appear due to non-resonant electron transport, the spin–orbit scattering or for chains fabricated on a substrate with localized electrons. It is also shown that for imperfect chains (e.g. with a reduced coupling strength between two neighboring sites) a diamond-like structure of the local DOS along the chain appears.

  13. Risikobasiertes Supply-Chain-Management

    DEFF Research Database (Denmark)

    Wieland, Andreas; Schinz, Philipp

    2015-01-01

    Das Management erlebt seit einigen Jahren dahingehend einen Paradigmenwechsel, dass nicht mehr Unternehmen als einzelne autonome Einheiten im Wettbewerb zueinander stehen, sondern die Supply Chains, in denen diese Unternehmen eingebunden sind. Ursachen hierfür sind beispielsweise die Auslagerung...... von Nicht-Kernprozessen auf vorgelagerte Stufen der Supply Chain oder auf Supply-Chain-Dienstleister sowie die Internationalisierung der Beschaffung. Dieser Paradigmenwechsel hat traditionelles Denken in den Schranken des Systems „Unternehmen“ abgelöst und zum Supply- Chain-Denken geführt, das vor......- und nachgelagerte Stufen des Systems „End-to-End-Supply-Chain“ einbezieht, etwa auch die Lieferanten von Lieferanten....

  14. Social Media and Supply Chain

    Directory of Open Access Journals (Sweden)

    Sonja Markova

    2013-02-01

    Full Text Available Web 2.0, also referred to as social media, is the use of the World Wide Web to increase creativity, information sharing, and collaboration among users. Social media is driving the rethinking of many of the principles of economics. The use of social media within supply chains is lagging behind their usage for other operational functions, however supply chain management is evolving into supply chain management 2.0.The purpose of this article is to provide researches of the supply chain management a reference with the main concepts of social media: social profiles, social applications, brand outposts and communities, and the social ecosystem.

  15. Integrating the healthcare supply chain.

    Science.gov (United States)

    Brennan, C D

    1998-01-01

    Today's integrated delivery systems (IDSs) require efficient supply chain processes to speed products to users at the lowest possible cost. Most excess costs within the supply chain are a result of inefficient and redundant processes involved in the transport and delivery of supplies from suppliers to healthcare providers. By integrating and assuming control of these supply chain processes, improving supply chain management practices, and organizing and implementing a disciplined redesign plan, IDSs can achieve substantial savings and better focus their organizations on their core patient care mission.

  16. Requirements of supply chain management in differentiating European pork chains

    NARCIS (Netherlands)

    Trienekens, J.H.; Wognum, P.M.

    2013-01-01

    This paper summarizes results obtained by research into pork chain management in the EU Integrated Project Q-Porkchains. Changing demands for intrinsic and extrinsic quality attributes of pork products impact the way supply chain management should be organized from the farmer down to the consumer. T

  17. SUPPLY CHAIN STRATEGIES IN THE CONTEXT OF AN E-COMMERCE CHAIN (E-CHAIN

    Directory of Open Access Journals (Sweden)

    João Gilberto Mendes do Reis

    2014-05-01

    Full Text Available This paper purpose to explore the relationships between supply chain strategies and product performance in retail e-commerce. In this case, we concern that in current, in order to bear up under competition, organizations have to manage their supply chains so that they meet the needs of their final customers. With this concept in mind, the research presented in this study focuses on establishing the right strategy for supply chains according to their product segment. Thus, after a Literature Review, the paper explain a methodology based in different authors studies. Finally the article focuses on a pratical case in e-commerce retail that describes its application in this field. The research shows that it is possible to use a methodology for classifying supply chains using chain strategies and product features. The use of the right strategy for supply chains will improve the competitive advantage of businesses. One limitation is that the methodology study focuses on only two e-commerce segment; future studies may go further in refining the proposed framework for other segments. The aim of this research is to offer businesses a model for evaluating supply chains, allowing them to improve the performance of their products and services by using the right strategy for supply chains. The classification proposal of this paper presents an original model for classification of supply chains based on different studies on the theme.

  18. Academic Education Chain Operation Model

    NARCIS (Netherlands)

    Ruskov, Petko; Ruskov, Andrey

    2007-01-01

    This paper presents an approach for modelling the educational processes as a value added chain. It is an attempt to use a business approach to interpret and compile existing business and educational processes towards reference models and suggest an Academic Education Chain Operation Model. The model

  19. Spectral Analysis of Markov Chains

    OpenAIRE

    2007-01-01

    The paper deals with the problem of a statistical analysis of Markov chains connected with the spectral density. We present the expressions for the function of spectral density. These expressions may be used to estimate the parameter of the Markov chain.

  20. LEAN SUPPLY CHAIN DESIGN PRINCIPLES

    OpenAIRE

    Kozlov, Aleksandr

    2015-01-01

    The article presents a set of principles, which can guide the design of lean supply chains. The author divides design principles into 3 main categories. The first two sets describe internal production processes while the 3-rd set relates to the entire supply chain.

  1. Negotiations in Supply Chain Management

    DEFF Research Database (Denmark)

    Zachariassen, Frederik

    2008-01-01

    negotiation literature. Subsequently, an empirical case study is presented, which explicitly aims at exploring the role of negotiations between members of a supply chain. Based on the findings, the paper concludes on specific, normative guidelines for negotiations for improved supply chain competitiveness...

  2. Chain formation of metal atoms

    DEFF Research Database (Denmark)

    Bahn, Sune Rastad; Jacobsen, Karsten Wedel

    2001-01-01

    The possibility of formation of single-atomic chains by manipulation of nanocontacts is studied for a selection of metals (Ni, Pd, Pt, Cu, Ag, Au). Molecular dynamics simulations show that the tendency for chain formation is strongest for Au and Pt. Density functional theory calculations indicate...

  3. Verifying the Hanging Chain Model

    Science.gov (United States)

    Karls, Michael A.

    2013-01-01

    The wave equation with variable tension is a classic partial differential equation that can be used to describe the horizontal displacements of a vertical hanging chain with one end fixed and the other end free to move. Using a web camera and TRACKER software to record displacement data from a vibrating hanging chain, we verify a modified version…

  4. Application research on virtual prototype technology in mine belt conveyor%虚拟样机技术在矿用带式输送机上的应用研究

    Institute of Scientific and Technical Information of China (English)

    程刚; 郭永存; 胡坤; 董祖伟

    2014-01-01

    将虚拟样机技术应用于矿用带式输送机的设计制造上可有效提高整机设计品质、缩短开发周期和降低开发成本。基于虚拟样机技术在机械产品研发中的技术优势与应用现状,列举了国外较为成熟的几款带式输送机专业化虚拟仿真软件,概述了国内学者借助第三方软件搭建带式输送机虚拟样机的方法策略,针对矿用带式输送机的刚-柔体结构特征,提出了建立矿用带式输送机虚拟样机多领域联合仿真的方法与设计框架,讨论了当前矿用带式输送机虚拟样机中关于输送带黏弹性体的准确建模、均匀与非均匀物料加载、柔性体输送带与刚性体零部件之间接触定义尚未妥善解决的三个关键技术问题,并给出相关解决建议与意见。%The application of virtual prototype technology in design and manufacture of the mine belt conveyor could effectively improve the whole conveyor′s design quality ,shorten development cycle and reduce development cost .Based on the technical advantages and application status of virtual prototype technology used in mechanical products research and development , this paper lists several simulation software of mature professional virtual belt conveyor abroad , summarizes the construction methods and strategies of belt conveyor′s virtual prototype through the third party software among the domestic scholars . In view of the firm-soft body structure characteristics of the mine belt conveyor , the multidisciplinary joint simulation method and design framework to establish virtual prototype on mine belt conveyor are proposed ,the three key technological issues without proper solutions yet are discussed in the current virtual prototype on mine belt conveyor :i.e .viscoelastic body′s accurate modeling of convey belt , homogeneous and heterogeneous material loading and definition of contact between flexible body conveyor belt and the rigid body components

  5. Developing sustainable food supply chains.

    Science.gov (United States)

    Smith, B Gail

    2008-02-27

    This paper reviews the opportunities available for food businesses to encourage consumers to eat healthier and more nutritious diets, to invest in more sustainable manufacturing and distribution systems and to develop procurement systems based on more sustainable forms of agriculture. The important factors in developing more sustainable supply chains are identified as the type of supply chain involved and the individual business attitude to extending responsibility for product quality into social and environmental performance within their own supply chains. Interpersonal trust and working to standards are both important to build more sustainable local and many conserved food supply chains, but inadequate to transform mainstream agriculture and raw material supplies to the manufactured and commodity food markets. Cooperation among food manufacturers, retailers, NGOs, governmental and farmers' organizations is vital in order to raise standards for some supply chains and to enable farmers to adopt more sustainable agricultural practices.

  6. Managing the Global Supply Chain

    DEFF Research Database (Denmark)

    Hsuan, Juliana; Skjøtt-Larsen, Tage; Kinra, Aseem

    edition has been fully updated with recent changes in concepts, technology and practice. Integration and collaboration are keywords in future competition. Firms must be agile and lean at the same time. The book gives an insightful overview of the conceptual foundations of the global supply chain, as......The world today faces global competition. The supply chain is vital part of the globalization process. Presenting a global view of the scope and complexity of supply chain management, this book reflects the rapid change that has taken place within the supply chain and its environment. This new...... well as current examples of best practice of managing supply chains in a global context....

  7. Environmental Management in Product Chains

    DEFF Research Database (Denmark)

    Jørgensen, Michael Søgaard; Forman, Marianne

    2009-01-01

    ). An overview of examples from our own research and from literature of the type and the role of environmental issues and initiatives in product chains (fourth section). A typology for characterizing corporate strategies as part of environmental management in product chains and characterizing those competencies......The chapter aims at giving background to companies, consultants, governmental regulators, NGOs etc. for the analysis and planning of environmental management in specific product chains through: A framework for understanding environmental management in product chains as shaped by the interaction...... between existing resources, norms and values and external pressures for environmental management (second section). A model for the types of corporate network relations that need to be mapped and understood in order to analyze and/or develop environmental management in a product chain (third section...

  8. The Service-Profit Chain

    DEFF Research Database (Denmark)

    Grønholdt, Lars; Martensen, Anne

    2016-01-01

    evidence of the employee-customer-profit chain. As it is possible to estimate the links, we have demonstrated their effect on company profitability. The research findings provide a better understanding of the service-profit chain and may help practitioners in improving company financial performance.......This paper examines the links between employee attitudes, customer loyalty and company profitability. From a conceptual point of view, this employee-customer-profit chain, also known as the service-profit chain, is well founded and generally accepted. But for many companies, it seems difficult...... to demonstrate such links, and several issues must be addressed to uncover the links. To investigate these links empirically, a hotel chain provided data matching employee and customer measures with measures of profitability. We have successfully employed a modeling approach, and the paper reports empirical...

  9. Managing the Global Supply Chain

    DEFF Research Database (Denmark)

    Skjøtt-Larsen, Tage; Schary, Philip B.; Mikkola, Juliana Hsuan

    The world today faces global competition. The supply chain is vital part of the globalization process. Presenting a global view of the scope and complexity of supply chain management, this book reflects the rapid change that has taken place within the supply chain and its environment. This new...... edition has been fully updated with recent changes in concepts, technology and practice. Integration and collaboration are keywords in future competition. Firms must be agile and lean at the same time. The book gives an insightful overview of the conceptual foundations of the global supply chain, as...... well as current examples of best practice of managing supply chains in a global context....

  10. 切碎玉米秸秆螺旋输送性能试验研究%Performance Experiment of Screw Conveyor for Chopped Corn Stalks

    Institute of Scientific and Technical Information of China (English)

    赵圆圆; 王春光; 乌兰图雅; 王金莲

    2015-01-01

    This paper studied the single factor test and the orthogonal test of the screw conveyor performance of chopped corn stalks in the horizontal screw conveyor test device .The experiment studied the influence to the productivity and power consumption on the screw shaft speed , filling coefficient and pitch .The single factor test showed that the screw shaft speed , filling coefficient and pitch influenced the productivity and power consumption significantly ;and with the in-crease of screw shaft speed , the increase of filling coefficient and the increase of pitch , the productivity and power con-sumption are on the rise .The orthogonal test showed that these three factors impact on the productivity of the primary and secondary order is pitch , filling coefficient , screw shaft speed;these three factors impact on the power consumption of the primary and secondary order is screw shaft speed;pitch , filling coefficient .By the integrated balance method , the opti-mal level combination to maximize the productivity is A 1 B1 C3 , namely screw shaft speed 56 r/min, filling coefficient of 0.3, the pitch of 300 mm.This experiment can provide reference to improve the overall quality of the corn stalks spiral conveying .%在水平螺旋输送试验装置上对切碎玉米秸秆的螺旋输送性能进行了单因素试验和正交试验,研究了螺旋轴转速、填充系数和螺距对输送量和功率消耗的影响。单因素试验结果表明:螺旋轴转速、填充系数和螺距对输送量和功率消耗的影响显著;且随着螺旋轴转速、填充系数和螺距的增大,输送量和功率消耗都呈上升趋势。正交试验结果表明:因素对输送量影响的主次顺序是螺距、填充系数、转速;因素对功率消耗影响的主次顺序是转速、螺距、填充系数。采用综合平衡法最终得到的较优水平组合是 A1 B1 C3,即螺旋轴转速56 r/min、填充系数0.3、螺距300 mm。本试验可为提高玉米

  11. Avaliação técnica de um transportador pneumático de grãos por aspiração Technical evaluation of a suction pneumatic grain conveyor

    Directory of Open Access Journals (Sweden)

    Luís Antônio Bortolaia

    2008-04-01

    Full Text Available Este trabalho apresenta os resultados da avaliação técnica do protótipo do transportador pneumático de grãos por aspiração ASP 200. O equipamento foi construído para uso em instalações armazenadoras agrícolas, na limpeza de pés de elevadores, moegas e renovação do ar em galerias de silos. Os testes avaliaram características mecânicas do equipamento, descargas de material e ar, perdas de carga, vedação do equipamento, eficiência dos captores e o diâmetro das mangueiras. Os resultados subsidiaram diversas recomendações para melhoria no projeto do equipamento, que aumentarão a sua eficiência operacional. Embora o transporte pneumático seja considerado uma ciência experimental, os autores notaram a falta de procedimentos, parâmetros e orientações para testes e comparações na literatura, que são fundamentais para o desenvolvimento do projeto desses transportadores.This research shows the results that were obtained from technical evaluation of ASP 200 prototype that is a suction pneumatic grain conveyor. This equipment was built to use in agricultural storage facilities to clean bucket elevator feet, loading hoppers and air renovation in silo galleries. The tests have evaluated mechanical characteristics of conveyor, air and material discharges, pressure losses, air infiltration, intake nozzle efficiency and piping diameters. The results have allowed several recommendations to improve equipment design that will increase its operational efficiency. Although pneumatic conveying is considered an experimental science, the authors have perceived the lack of procedures, parameters and orientations to conduct tests and comparisons in literature, that are fundamental to develop a design of this conveyor type.

  12. Application of plasma cladding technology to reparation of middle pan of scraper conveyor%等离子熔覆修复技术在中部槽维修中的应用

    Institute of Scientific and Technical Information of China (English)

    张永强; 马忠昌; 李鹏

    2014-01-01

    从刮板输送机中部槽的结构原理和材料入手,分析了刮板输送机中部槽失效的原因,详细阐述了等离子熔覆修复技术在刮板输送机中部槽磨损中板修复中的应用。通过井下工业性对比试验证明,采用等离子熔覆修复技术修复的刮板输送机中部槽不仅能够提升维修品质、延长使用寿命和降低设备的维修频次,而且能够减少人力和维修材料等系统性的浪费。%From the structure principle and the used material of middle pan of scraper conG veyor for fully mechanized mining,the failure reasons of middle pan of scraper conveyor were anG alyzed and the application of plasma cladding technology to reparation of wornGout middle plate in middle pan of scraper conveyor was described in detail�The contrast underground industrial tests showed that the middle pan of scraper conveyor repaired by plasma cladding technology are of good maintenance quality,increased service life and decreased maintenance frequency,as well as less wastes of manpower and maintenance materials.

  13. Detection system design of powerful conveyor belt based on the X-ray%基于X射线的强力运送带检测系统设计

    Institute of Scientific and Technical Information of China (English)

    谭成; 薛彦波; 胡宗亮

    2016-01-01

    In view of the existing strength conveyor belt fault line detection and location is difficult and waste a long time,the design of a conveyor belt automatic detection system handle the joint tensile,corrosion,fracture and other issues.Based on the video image acqui⁃sition principle and defect detection algorithm,it design the overall scheme of the system,combined with hardware and software develop⁃ment,the conveyor belt online detection,real⁃time,rapidly visual detection,for steel wire rope core conveyer belt running status,fault di⁃agnosis and decision make a reliable judgement way.%针对现有的强力运送带故障在线检测定位难、周期长情况,设计一套输送带自动检测系统来处理接头拉伸、锈蚀、断裂等故障问题。依据视频图像采集原理及缺陷检测技术算法,设计系统总体方案,结合硬件和软件开发,实现了运送带在线检测、实时性、快速性的可视化检测,为钢丝绳芯运送带运行状况、故障诊断与决策得出可靠判断方式。

  14. 不同载荷下的可伸缩带式输送机动态特性分析%Dynamic Performance Analysis of Extensible Belt Conveyor under Different Loads

    Institute of Scientific and Technical Information of China (English)

    苏永红

    2016-01-01

    The model of an extensible belt conveyor was set up by AMESim ,the processes of start ,full‐speed moving and the tail moving of belt conveyor under different load were simulated .The simulation shows that in the starting of the belt conveyor ,the load has significant effect on driving drum tension ,the lag of tail speed and the peak velocity of take‐up;In the process of tensioning force change ,the greater the load ,the greater the tension fluctuation at driving drum ;In the process of the tail moving ,the greater the load ,the slower the speed of tension wave spread to the driving drum ,the faster the attenuation of tension fluctuation at driving drum and the take‐up speed fluctuation .%建立了可伸缩带式输送机AMESim模型,对输送机在不同载荷下启动、满速运行和机尾自移等过程进行了仿真。仿真结果表明,带式输送机启动过程中,载荷量对驱动滚筒趋入点张力、机尾速度响应时间和游动小车速度峰值等均有明显影响;拉紧力变化过程中,载荷量越大,驱动滚筒趋入点张力波动越大;机尾自移时,载荷量越大,应力波传到机头的速度越慢,驱动滚筒趋入点张力波动和游动小车速度波动衰减越快。

  15. Solvent minimization induces preferential orientation and crystal clustering in serial micro-crystallography on micro-meshes, in situ plates and on a movable crystal conveyor belt.

    Science.gov (United States)

    Soares, Alexei S; Mullen, Jeffrey D; Parekh, Ruchi M; McCarthy, Grace S; Roessler, Christian G; Jackimowicz, Rick; Skinner, John M; Orville, Allen M; Allaire, Marc; Sweet, Robert M

    2014-11-01

    X-ray diffraction data were obtained at the National Synchrotron Light Source from insulin and lysozyme crystals that were densely deposited on three types of surfaces suitable for serial micro-crystallography: MiTeGen MicroMeshes™, Greiner Bio-One Ltd in situ micro-plates, and a moving kapton crystal conveyor belt that is used to deliver crystals directly into the X-ray beam. 6° wedges of data were taken from ∼100 crystals mounted on each material, and these individual data sets were merged to form nine complete data sets (six from insulin crystals and three from lysozyme crystals). Insulin crystals have a parallelepiped habit with an extended flat face that preferentially aligned with the mounting surfaces, impacting the data collection strategy and the design of the serial crystallography apparatus. Lysozyme crystals had a cuboidal habit and showed no preferential orientation. Preferential orientation occluded regions of reciprocal space when the X-ray beam was incident normal to the data-collection medium surface, requiring a second pass of data collection with the apparatus inclined away from the orthogonal. In addition, crystals measuring less than 20 µm were observed to clump together into clusters of crystals. Clustering required that the X-ray beam be adjusted to match the crystal size to prevent overlapping diffraction patterns. No additional problems were encountered with the serial crystallography strategy of combining small randomly oriented wedges of data from a large number of specimens. High-quality data able to support a realistic molecular replacement solution were readily obtained from both crystal types using all three serial crystallography strategies.

  16. Solvent minimization induces preferential orientation and crystal clustering in serial micro-crystallography on micro-meshes, in situ plates and on a movable crystal conveyor belt

    Energy Technology Data Exchange (ETDEWEB)

    Soares, Alexei S., E-mail: soares@bnl.gov [Brookhaven National Laboratory, Upton, NY 11973 (United States); Mullen, Jeffrey D. [Brookhaven National Laboratory, Upton, NY 11973 (United States); University of Oregon, Eugene, OR 97403-1274 (United States); Parekh, Ruchi M. [Brookhaven National Laboratory, Upton, NY 11973 (United States); Suffolk County Community College, Selden, NY 11784 (United States); McCarthy, Grace S.; Roessler, Christian G.; Jackimowicz, Rick; Skinner, John M. [Brookhaven National Laboratory, Upton, NY 11973 (United States); Orville, Allen M. [Brookhaven National Laboratory, Upton, NY 11973 (United States); Brookhaven National Laboratory, Upton, NY 11973 (United States); Allaire, Marc [Brookhaven National Laboratory, Upton, NY 11973 (United States); Sweet, Robert M. [Brookhaven National Laboratory, Upton, NY 11973 (United States); Brookhaven National Laboratory, Upton, NY 11973 (United States)

    2014-10-09

    Strategies are described for optimizing the signal-to-noise of diffraction data, and for combining data from multiple crystals. One challenge that must be overcome is the non-random orientation of crystals with respect to one another and with respect to the surface that supports them. X-ray diffraction data were obtained at the National Synchrotron Light Source from insulin and lysozyme crystals that were densely deposited on three types of surfaces suitable for serial micro-crystallography: MiTeGen MicroMeshes™, Greiner Bio-One Ltd in situ micro-plates, and a moving kapton crystal conveyor belt that is used to deliver crystals directly into the X-ray beam. 6° wedges of data were taken from ∼100 crystals mounted on each material, and these individual data sets were merged to form nine complete data sets (six from insulin crystals and three from lysozyme crystals). Insulin crystals have a parallelepiped habit with an extended flat face that preferentially aligned with the mounting surfaces, impacting the data collection strategy and the design of the serial crystallography apparatus. Lysozyme crystals had a cuboidal habit and showed no preferential orientation. Preferential orientation occluded regions of reciprocal space when the X-ray beam was incident normal to the data-collection medium surface, requiring a second pass of data collection with the apparatus inclined away from the orthogonal. In addition, crystals measuring less than 20 µm were observed to clump together into clusters of crystals. Clustering required that the X-ray beam be adjusted to match the crystal size to prevent overlapping diffraction patterns. No additional problems were encountered with the serial crystallography strategy of combining small randomly oriented wedges of data from a large number of specimens. High-quality data able to support a realistic molecular replacement solution were readily obtained from both crystal types using all three serial crystallography strategies.

  17. The Application ofMaterial Handling System ofBeltConveyor Controlled by Mitsubishi PLC%三菱PLC控制带式输送机物料输送系统的应用

    Institute of Scientific and Technical Information of China (English)

    李欢良

    2016-01-01

    带式输送机在江铜各大厂矿得到广泛应用,它的控制形式有继电接触器、单片机、微机和PLC控制等多种形式。根据江铜输送矿石的实际需求和应用,提出多级带式输送机集中控制系统设计方案。根据带式输送机的工作流程和控制要求,利用三菱FX2N系列PLC的集中控制和简单可视化的程序开发设计带式输送机物料输送控制系统。根据设计条件、控制要求,分析输入输出地址,设计了电路图、接线图和梯形图,对PLC进行了选型、程序的编制,并对程序进行模拟仿真,确保程序的可运行性。%With the development of modern industrial technology, the applicationof belt conveyor hasbecome increasingly widespreadin Jiangxi Copper with diversified forms of relay contactor, single-chip microcomputer, microcomputer and PLC control. This paper puts forward the centralized control system design of multi-stage belt conveyor on the basis of the practical needs and application. It introducesthe application of PLC to the electric control system of the belt conveyor. According to the requirements for production control of the belt conveyor, we develops the control systembased on the centralized control and simple visualization of the Mitsubishi FX2N PLC. We analyze the input and output address analysis, design the circuit diagram, wiring diagram and ladder diagram, select the PLC model and program it based on the design condition and control requirement, and simulate the program to ensure its performability.

  18. Conveyor Belt Surface Image Correction and Fault Detection Algorithm Research Based on Machine Vision%基于机器视觉的输送带图像校正和故障检测算法研究

    Institute of Scientific and Technical Information of China (English)

    2016-01-01

    为了消除基于机器视觉的输送带故障在线监测系统中采集图像的不均匀光照影响,提高图像质量,检测出图像中的故障区域,提出了一种基于机器视觉的输送带图像校正和故障检测算法.该算法首先采用Butterworth低通滤波器对图像滤波,结合Retinex理论计算估计真实图像的背景,对图像进行灰度校正,得到校正后的图像;然后将机器视觉与生物视觉相结合,利用PCNN算法,对采集的图像进行检测,检测出故障区域.实验结果表明,算法能有效校正输送带表面图像,清晰检测出故障区域,具有很高的应用价值.%For the purposes of eliminating the influence of the non-uniform illumination which was used in on-line fault moni-toring system of conveyor belt based on machine vision and improved the quality of detected image and detecting the fault area of the image, a new kind of detection algorithm based on machine vision was proposed which can be used to realize the image correc-tion and fault detection of conveyor belt. The proposed algorithm firstly implemented the low-pass filtering of the acquired images by using Butterworth low-pass filter, then established estimated background model of the non-uniform illumination based on Retinex theory. Gray scale of the image can be amended evenly. Lastly, by using the combination the machine vision with biological vision and PNCC theory, the defected area of collected surface image of the conveyor belt was detected. Experimental results show that the proposed algorithm can be effectively used to correct the uneven gray scale of the surface images and detect the defected area of the surface image. It proves that this proposed algorithm has very high application value in mine belt conveyor supervision system.

  19. DISCUSSION ON PROBLEMS IN DOUBLE-LAYER BELT CONVEYOR AND RESOLUTIONS%双层皮带机存在问题及解决措施的探讨

    Institute of Scientific and Technical Information of China (English)

    谭仕梅; 张云斌

    2012-01-01

    The causes are analyzed for the problem exposed during the operation of a double-layer belt conveyor for finish product in fertilizer plant and optimized actual operation effect after the transformation evaluated. measures for improvement are introduced and the%针对化肥成品装置双层皮带机在生产中暴露出来的问题,分析存在的原因,介绍优化改进措施,对改造后的实际运行效果进行评价。

  20. Cause analysis of and measures against frequent belt conveyor high-voltage motor faults%带式输送机高压电动机故障频发的原因分析及对策

    Institute of Scientific and Technical Information of China (English)

    薛永杰

    2011-01-01

    The paper carries out field studies specific to the frequent phenomenon that the high-voltage motor is burned in the belt conveyor system, and finds out the root causes that led to the accidents. thereby effectively prevent the impact on the production imposed hy the motor fault.%针对带式输送机系统频繁出现的高压电动机烧毁现象进行现场研究,找出了事故发生的根源,从而有效避免了电动机故障对生产的影响.

  1. Elastic Behavior of Polymer Chains

    Institute of Scientific and Technical Information of China (English)

    Teng Lu; Tao Chen; Hao-jun Liang

    2008-01-01

    The elastic behavior of the polymer chain was investigated in a three-dimensional off-lattice model. We sample more than 109 conformations of each kind of polymer chain by using a Monte Carlo algorithm, then analyze them with the non-Gaussian theory of rubberlike elasticity, and end with a statistical study. Through observing the effect of the chain flexibility and the stretching ratio on the mean-square end-to-end distance,the average energy, the average Helmholtz free energy, the elastic force, the contribution of energy to the elastic force, and the entropy contribution to elastic force of the polymer chain, we find that a rigid polymer chain is much easier to stretch than a flexible polymer chain. Also, a rigid polymer chain will become difficult to stretch only at a quite high stretching ratio because of the effect of the entropy contribution.These results of our simulation calculation may explain some of the macroscopic phenomena of polymer and biomacromolecular elasticity.

  2. Traceability in food supply chain:: Towards the synchronised supply chain

    OpenAIRE

    Lindh, Helena; Skjöldebrand, Christina; Olsson, Annika

    2008-01-01

    Today, food products are distributed all over the world. This has led to advantages in terms of availability but disadvantages in terms of more complex food supply chains. Global food competition is intense and therefore actors have started to adapt their mindsets toward a more holistic view and a supply chain perspective. In addition, food scares during recent years have turned focus towards food safety and traceability in a “farm-to-fork” perspective. The aim of this study is to explore...

  3. Markov chains theory and applications

    CERN Document Server

    Sericola, Bruno

    2013-01-01

    Markov chains are a fundamental class of stochastic processes. They are widely used to solve problems in a large number of domains such as operational research, computer science, communication networks and manufacturing systems. The success of Markov chains is mainly due to their simplicity of use, the large number of available theoretical results and the quality of algorithms developed for the numerical evaluation of many metrics of interest.The author presents the theory of both discrete-time and continuous-time homogeneous Markov chains. He carefully examines the explosion phenomenon, the

  4. Markov Chains and Markov Processes

    OpenAIRE

    2016-01-01

    Markov chain, which was named after Andrew Markov is a mathematical system that transfers a state to another state. Many real world systems contain uncertainty. This study helps us to understand the basic idea of a Markov chain and how is been useful in our daily lives. For some times there had been suspense on distinct predictions and future existences. Also in different games there had been different expectations or results involved. That is the reason why we need Markov chains to predict o...

  5. New sensors and processing chain

    CERN Document Server

    Yaakoubi, Nourdin

    2014-01-01

    A vital tool for researchers, engineers, and students, New Sensors and Processing Chain focuses on the processing chain to set up in order to extract relevant information on various systems. Highlighting the design of new microsensors and various applications, the authors present recent progress in instrumentation and microsystem design, providing insight to the modification of the sensor itself as well as its environment. Various applications illustrate the presentations, which show how a processing chain is organized from the data acquired by a specific sensor.

  6. Supply Chain Shipment Pricing Data

    Data.gov (United States)

    US Agency for International Development — This data set provides supply chain health commodity shipment and pricing data. Specifically, the data set identifies Antiretroviral (ARV) and HIV lab shipments to...

  7. Environmental management in product chains

    DEFF Research Database (Denmark)

    Jørgensen, Michael Søgaard; Forman, Marianne; Hansen, Anne Grethe

    of environmental initiatives, a number of recommendations for governmental regulation, which can support the further diffusion of environmental management in product chains, are developed. Furthermore, the report describes a number of theoretical perspectives from sociology of technology, organisation theory...

  8. Bibliometric Application of Markov Chains.

    Science.gov (United States)

    Pao, Miranda Lee; McCreery, Laurie

    1986-01-01

    A rudimentary description of Markov Chains is presented in order to introduce its use to describe and to predict authors' movements among subareas of the discipline of ethnomusicology. Other possible applications are suggested. (Author)

  9. Gravity Waves from Chain Inflation

    CERN Document Server

    Ashoorioon, Amjad

    2008-01-01

    Chain inflation proceeds through a series of first order phase transitions, which can release considerable gravitational waves (GW). We demonstrate that bubble collisions can leave an observable signature for future high-frequency probes of GWs, such as advanced LIGO, LISA and BBO. A "smoking gun" for chain inflation would be wiggles in the spectrum (and consequently in the tensor spectral index) due to the multiple phase transitions. The spectrum could also be distinguished from a single first order phase transition by a small difference in the amplitude at low frequency. A second origin of GWs in chain inflation are tensor modes from quantum fluctuations; these GW can dominate and be observed on large scales. The consistency relation between scalar and tensor modes is different for chain inflation than for standard rolling models and is testable by Cosmic Microwave Background experiments. If inflation happened through a series of rapid tunnelings in the string landscape, future high frequency probes of GW c...

  10. Markov Chains and Chemical Processes

    Science.gov (United States)

    Miller, P. J.

    1972-01-01

    Views as important the relating of abstract ideas of modern mathematics now being taught in the schools to situations encountered in the sciences. Describes use of matrices and Markov chains to study first-order processes. (Author/DF)

  11. The chain re-action

    CERN Multimedia

    2009-01-01

    On 18 March, beam commissioning started in the first ‘link’ of the accelerator chain – LINAC 2. This marks the start of what will be the longest period of beam operations in CERN’s history, with the accelerator complex remaining operational throughout the winter to supply the LHC. The Bulletin finds out what is being done to make sure the whole chain is ready for this historic run.

  12. "Bullwhip Effect" in Supply Chains

    Directory of Open Access Journals (Sweden)

    Anđelko Ščukanec

    2007-09-01

    Full Text Available The system which connects all the elements between theproducer and the consumer is called the supply chain. This definitionof the supply chain shows its complexity, dynamics anduncertainty. Successful operation of supply chains requires thebest possible coordination of its elements, which obviously indicatesthe utmost importance of the information flow alongthem. The operation of supply chains on the whole has to bemore successful than the operation of their individual elements.It should be noted that such a complex process may give rise toa series of problems, unwanted events, as well as substantial reductionin profits and the level of service. One of such unwantedphenomena which may occur in the supply chain is the"bullwhip effect". This is a possible increase in the diversity oforders which occurs when we move along the elements of thesupply chain (from the customers' orders to the producers' orders.The work analyses the processes within the supply chainsand the occurrence of the bullwhip effect. The main causes ofthe bullwhip effect that we encounter daily in the supply chainshave been clearly defined. The paper also presents the mainnegative consequences of such a disturbance within the supplychains, and provides possible solutions for avoiding the bullwhipeffect.

  13. Reinforcement learning in supply chains.

    Science.gov (United States)

    Valluri, Annapurna; North, Michael J; Macal, Charles M

    2009-10-01

    Effective management of supply chains creates value and can strategically position companies. In practice, human beings have been found to be both surprisingly successful and disappointingly inept at managing supply chains. The related fields of cognitive psychology and artificial intelligence have postulated a variety of potential mechanisms to explain this behavior. One of the leading candidates is reinforcement learning. This paper applies agent-based modeling to investigate the comparative behavioral consequences of three simple reinforcement learning algorithms in a multi-stage supply chain. For the first time, our findings show that the specific algorithm that is employed can have dramatic effects on the results obtained. Reinforcement learning is found to be valuable in multi-stage supply chains with several learning agents, as independent agents can learn to coordinate their behavior. However, learning in multi-stage supply chains using these postulated approaches from cognitive psychology and artificial intelligence take extremely long time periods to achieve stability which raises questions about their ability to explain behavior in real supply chains. The fact that it takes thousands of periods for agents to learn in this simple multi-agent setting provides new evidence that real world decision makers are unlikely to be using strict reinforcement learning in practice.

  14. 皮带输送机在大型散装硫磺转运系统的应用%APPLICATION OF CONVEYOR IN LARGESCALE BULK SULFUR TRANSFER SYSTEM

    Institute of Scientific and Technical Information of China (English)

    焦玉清

    2013-01-01

    分析了普光天然气净化厂皮带输送机,在大型散装硫磺转运系统中存在的硫磺着火和粉尘爆炸、硫磺腐蚀、皮带跑偏等技术难题,针对这些难题,优选皮带输送机的关键部件,设计可靠的运行控制系统,采用多项安全防护技术,实现了普光气田天然气净化厂散装硫磺转运系统的安全、平稳、长周期运行.%This paper analyzes the technical problems of belt conveyor in large bulk sulfur transfer system which include sulfur burning, dust explosion,sulfur corrosion,run offset and so on. Aiming at these problems, the key parts of the belt conveyor are optimized; reliable operation control system is designed and multiple security protection technologies are adopted, which help to realize the safe, stable and long period operation of the bulk sulfur transfer system in Natural Gas Purification Plant of Puguang Gas Field.

  15. The design and calculation of screw conveyor and its application in pulp and paper industry%螺旋输送器的设计计算及其在制浆造纸工业的应用

    Institute of Scientific and Technical Information of China (English)

    邵贤林; 王平

    2013-01-01

    Screw conveyor is an important material transporting equipment in pulp and paper industry. In this article was introduced the conveying mechanism of the horizontal or inclined and vertical screw conveyors and the determination of the main parameters firstly, then their application in pulp and paper industry. Through experiment, the data of the materials commonly used in pulping, such as the loose density were worked out.%螺旋输送器是制浆造纸工业中物料输送的重要设备。本文首先讨论了水平(或倾斜式)与立式螺旋输送器的输送机理和主要参数的确定,然后讨论了在制浆造纸工业的应用,并通过实验给出了常用制浆材料的松密度等数据。

  16. Application of Explosion-proof Hydraulic Station for Cable Belt Conveyor%钢绳牵引皮带运输机防爆液压站的应用

    Institute of Scientific and Technical Information of China (English)

    常胜涛

    2012-01-01

    PY-140B液压站是专门为钢带机制动器配套设计制造的,它和制动器组合成一套制动系统,当压力油进入制动器油缸推动活塞,碟形弹簧成松闸状态,使钢带机正常运输;当油缸内压力下降时,碟形弹簧复位、推动活塞向前,使闸瓦接触制动盘,实现安全制动;当主机工作发生故障时,能紧急制动使主机安全、可靠的停车。%PY-140B hydraulic station is exclusively designed and manufactured for the brake of cable belt conveyor as a set of braking system with the brake,in which the cable belt conveyor works normally when pressure oil enters the brake cylinder,pushes the piston and makes the disk spring loosen;safe braking is realized when the brake shoe contacts the brake with the pressure oil decreasing,the disk spring resetting and pushing the piston forward;and emergency braking makes the main engine shutdown safely and reliably when the main engine breaks down.

  17. 长距离、大功率带式输送机驱动方式分析%Analysis on drive modes of long-distance high-power belt conveyor

    Institute of Scientific and Technical Information of China (English)

    陈建松; 周伟朵

    2012-01-01

    通过对长距离、大功率带式输送机3种驱动方式的技术经济比较,得出高压变频器驱动方式不仅在带式输送机起动方面有优良的性能,在运行方面也能满足输送机频繁重载起制动、频繁切换工况、小流量输料等生产特点,而且高效节能.%By technical economical comparison of three drive modes of long-distance high-power belt conveyors, this paper proves that the drive mode of high voltage frequency converter has excellent performance in start-up of the belt conveyor, and for the operation aspect it can meet requirements of frequent heavy-loaded start-up and braking, and frequent switching conditions, as well as small flow material conveying. In addition, the mentioned drive mode has high efficient and energy-saving properties.

  18. Sports Nutrition Food Industry Chain Development Research

    OpenAIRE

    Jie Yin

    2015-01-01

    Through the study of Henan sports nutrition food industry chain optimization, the study analyses development advantage and competitive advantage of Henan in sports nutrition food industry chain and existing problems and challenges in Henan sports nutrition food industry chain and at the same time introduces the theory of supply chain management to the development of sports nutrition food industry chain, clearly optimizes countermeasures of sports nutrition food industry chain. Pointing out sp...

  19. 螺旋钻采煤机输送机构振动频率的计算与分析%Calculation and analysis of vibration frequency of spiral conveyor for coal auger

    Institute of Scientific and Technical Information of China (English)

    李晓豁; 郭继文; 王丽; 战林

    2011-01-01

    In order to study the vibration behavior of spiral conveyor of a coal auger during the work process, a dynamic model using Euler angles to describe the vibration according to Lyapunov theory was established, and ANSYS software was used to establish parameterization finite element simulation model based on APDL language. The vibration of a certain type of spiral conveyor for coal auger were calculated and simulated using the two methods, and the first fifth-order vibration frequency and maximum amplitude equivalent contour of spiral conveyor were obtained. The results of vibration analysis by ANSYS show that transverse resonance occurred in the X and Z directions, the maximum resonance amplitude occurred in the 500 Hz and 100 Hz, longitudinal resonance occurred in the Y direction, the maximum resonance amplitude occurred in the 500 Hz, and the amplitude of X direction is the largest and amplitude of Z direction is the minimum. The stress contour shows that the stress of spiral conveyor is minimum at the bottom, and the stress at the junction of spindle and helical vane is maximum. Because of the large stress at the top of spiral conveyor, the wear and deformation is serious. The results indicate that the Lyapunov theory model is straight forward and the calculation is simple; the ANSYS model is flexibility and the results are intuitively obvious although the accuracy is dependent on the selection of element type, meshing accuracy and the methods of vibration extraction. The maximum error obtained from both methods is 9. 9% , capable of reflecting the true vibration.%为了研究螺旋钻采煤机输送机构工作过程的振动,根据Lyapunov理论建立了用欧拉角描述的振动动力学方程,应用ANSYS软件建立了基于APDL语言的参数化有限元仿真模型,利用两种方法对某型螺旋钻采煤机输送机构的振动频率进行了计算和仿真,得到了输送机构前五阶的振动频率和最大振幅等效云图.其中通过ANSYS振动

  20. Demand chain management - The evolution

    Directory of Open Access Journals (Sweden)

    D Ericsson

    2011-06-01

    Full Text Available The concepts of Supply Chain Management (SCM and Demand Chain Management (DCM are among the new and debated topics concerning logistics in the literature. The question considered in this paper is: “Are these concepts needed or will they just add to the confusion?” Lasting business concepts have always evolved in close interaction between business and academia. Different approaches start out in business and they are then, more or less si- multaneously, aligned, integrated, systemised and structured in academia. In this way a terminology (or language is provided that helps in further diffusion of the concepts. There is a lack of consensus on the definition of the concept of SCM. This may be one of the major reasons for the difficulty in advancing the science and measuring the results of implementation in business. Relationships in SCM span from rather loose coalitions to highly structured virtual network integrations. DCM is a highly organised chain in which the key is mutual interdependence and partnership. The purpose is to create a distinctive competence for the chain as a whole that helps to identify and satisfy customer needs and wishes. The classical research concerning vertical marketing systems is very helpful in systemising the rather unstructured discussions in current SCM research. The trend lies in increasing competition between channels rather than between companies, which in turn leads to the creation of channels with a high degree of partnership and mutual interdependence between members. These types of channels are known as organised vertical marketing systems in the classic marketing channel research. The behaviour in these types of channels, as well as the formal and informal structures, roles in the network, power and dependence relations, etc. are well covered topics in the literature. The concept of vertical marketing systems lies behind the definition of demand chains and demand chain management proposed in this paper. A

  1. Regenerative treatment using a radioelectric asymmetric conveyor as a novel tool in antiaging medicine: an in vitro beta-galactosidase study

    Directory of Open Access Journals (Sweden)

    Rinaldi S

    2012-06-01

    Full Text Available Salvatore Rinaldi,1,2 Margherita Maioli,1,3,4 Sara Santaniello,3,4 Alessandro Castagna,1,2 Gianfranco Pigliaru,3,4 Sara Gualini,3,4 Matteo Lotti Margotti,5 Arturo Carta,6 Vania Fontani,1,2 Carlo Ventura1,4,71Department of Regenerative Medicine, Rinaldi Fontani Institute, Florence; 2Department of Neuro Psycho Physio Pathology and Neuro Psycho Physical Optimization, Rinaldi Fontani Institute, Florence; 3Department of Biomedical Sciences, University of Sassari, Sassari; 4Laboratory of Molecular Biology and Stem Cell Engineering, National Institute of Biostructures and Biosystems, Bologna; 5Department of Information Technology and Statistical Analysis, Rinaldi Fontani Institute, Florence; 6Ophthalmology Section, University of Parma, Parma; 7Cardiovascular Department, S Orsola Malpighi Hospital, University of Bologna, Bologna, ItalyBackground: Beta-galactosidase is the most widely used biomarker for highlighting the processes of cellular aging, including neurodegeneration. On this basis, we decided to test in vitro whether a set of rescuing/reparative events previously observed by us in subjects treated with radioelectric asymmetric conveyor (REAC technology may also involve antagonism of a marker of aging-related degenerative processes, as assessed by a reduction in beta-galactosidase at the cellular level.Methods: Human adipose-derived stem cells were cultured at different passages, ranging from 5 to 20, with or without REAC exposure for 12 hours. The cells were then processed for biochemical beta-galactosidase staining and morphological microscopy analysis.Results: We observed a significant reduction in expression of senescence associated-beta-galactosidase, and a persistence of fibroblast-like morphology typical of human adipose-derived stem cells, even at late passages.Conclusion: Our results indicate the ability of REAC technology to counteract in vitro senescence of human adipose-derived stem cells, and prompt the hypothesis that such

  2. 除冰车铲冰装置传送带的分析与研究%Analysis and Research of Deicing Special Vehicle Shovel Ice Device Conveyor

    Institute of Scientific and Technical Information of China (English)

    张志富; 黄其柏; 陈定方; 王晓娟

    2015-01-01

    In view of the phenomenon that icy roads to road traffic accidents have severely affected,a mechanical deicing special vehicle for road deicing,which carried on the reasonable design and layout is devised.The belt drive system of mechanical deicing device is major researched,infinitesimal dynamics equation of conveyor belt is established,and the belt drive system is analyzed in theory.Through theory design and engineering design algorithm,the belt transmission torque and power is analyzed,the foundation for the further study of belt transmission is laid.By using the ANSYS and ADAMS,the stress simulation and dynamics simulation of belt drive systems are carried out,and the correctness of the preliminary design of pulley drive system is validated,the technical support of the optimum design of deicing special vehicle is provided.The study of deicing special vehicle deicing efficiency has played a key role,which with better economic benefits and promotional value.%针对路面结冰对道路交通安全事故存在严重影响的现象,设计出了一款用于道路除冰的机械式除冰专用车,对其进行合理的设计与布局;主要研究机械铲冰装置的带传动系统,建立传送带的微元动力学方程,对带传动系统进行了理论分析;通过理论设计和工程设计算法对带传动的转矩和功率进行分析,为带传动进一步的研究奠定了基础;通过ANSYS和ADAMS对带传动系统分别进行应力仿真和动力学仿真,验证了初步设计的带轮传动系统的正确性,为除冰车的优化设计提供了技术支撑,对除冰车除冰效率的研究起到了关键的作用,具有较好的经济效益和推广价值.

  3. Mining-induced fault reactivation associated with the main conveyor belt roadway and safety of the Barapukuria Coal Mine in Bangladesh: Constraints from BEM simulations

    Energy Technology Data Exchange (ETDEWEB)

    Islam, Md. Rafiqul; Shinjo, Ryuichi [Department of Physics and Earth Sciences, University of the Ryukyus, Okinawa, 903-0213 (Japan)

    2009-09-01

    Fault reactivation during underground mining is a critical problem in coal mines worldwide. This paper investigates the mining-induced reactivation of faults associated with the main conveyor belt roadway (CBR) of the Barapukuria Coal Mine in Bangladesh. The stress characteristics and deformation around the faults were investigated by boundary element method (BEM) numerical modeling. The model consists of a simple geometry with two faults (Fb and Fb1) near the CBR and the surrounding rock strata. A Mohr-Coulomb failure criterion with bulk rock properties is applied to analyze the stability and safety around the fault zones, as well as for the entire mining operation. The simulation results illustrate that the mining-induced redistribution of stresses causes significant deformation within and around the two faults. The horizontal and vertical stresses influence the faults, and higher stresses are concentrated near the ends of the two faults. Higher vertical tensional stress is prominent at the upper end of fault Fb. High deviatoric stress values that concentrated at the ends of faults Fb and Fb1 indicate the tendency towards block failure around the fault zones. The deviatoric stress patterns imply that the reinforcement strength to support the roof of the roadway should be greater than 55 MPa along the fault core zone, and should be more than 20 MPa adjacent to the damage zone of the fault. Failure trajectories that extend towards the roof and left side of fault Fb indicate that mining-induced reactivation of faults is not sufficient to generate water inflow into the mine. However, if movement of strata occurs along the fault planes due to regional earthquakes, and if the faults intersect the overlying Lower Dupi Tila aquiclude, then liquefaction could occur along the fault zones and enhance water inflow into the mine. The study also reveals that the hydraulic gradient and the general direction of groundwater flow are almost at right angles with the trends of

  4. Tunneling magnetoresistance of silicon chains

    Science.gov (United States)

    Matsuura, Yukihito

    2016-05-01

    The tunneling magnetoresistance (TMR) of a silicon chain sandwiched between nickel electrodes was examined by using first-principles density functional theory. The relative orientation of the magnetization in a parallel-alignment (PA) configuration of two nickel electrodes enhanced the current with a bias less than 0.4 V compared with that in an antiparallel-alignment configuration. Consequently, the silicon chain-nickel electrodes yielded good TMR characteristics. In addition, there was polarized spin current in the PA configuration. The spin polarization of sulfur atoms functioning as a linking bridge between the chain and nickel electrode played an important role in the magnetic effects of the electric current. Moreover, the hybridization of the sulfur 3p orbital and σ-conjugated silicon 3p orbital contributed to increasing the total current.

  5. MODELING SUPPLY CHAIN PERFORMANCE VARIABLES

    Directory of Open Access Journals (Sweden)

    Ashish Agarwal

    2005-01-01

    Full Text Available In order to understand the dynamic behavior of the variables that can play a major role in the performance improvement in a supply chain, a System Dynamics-based model is proposed. The model provides an effective framework for analyzing different variables affecting supply chain performance. Among different variables, a causal relationship among different variables has been identified. Variables emanating from performance measures such as gaps in customer satisfaction, cost minimization, lead-time reduction, service level improvement and quality improvement have been identified as goal-seeking loops. The proposed System Dynamics-based model analyzes the affect of dynamic behavior of variables for a period of 10 years on performance of case supply chain in auto business.

  6. Who Manages Our Supply Chains?

    DEFF Research Database (Denmark)

    Flöthmann, Christoph

    to manage the manifold tasks they face on a daily basis. Unfortunately, as globalization has simultaneously increased the complexity of supply chains and the demand for highly qualified personnel, companies are facing a significant undersupply of talent (Cottrill, 2010). Moreover, organizations appear......While managers in traditional management functions focus on developing strong expertise to become “specialists” in their own discipline, supply chain managers are a different species: They have to combine a cross-functional understanding of various business fields and multi-faceted competencies...... to lack understanding of supply chain personnel and how to support their recruitment, succession planning, and training and development (John, 2015). Surprisingly, at the same time, scientific research on that topic is relatively scarce. In response, the overarching purpose of this paper...

  7. Designing the Reverse Supply Chain

    DEFF Research Database (Denmark)

    Gobbi, Chiara

    2011-01-01

    for the reverse supply chain. Design/methodology/approach – In order to identify the relevance of the Fisher model, the model needs to be recast in terms of PRV, which, in this context, is considered the independent variable in the reverse logistics arena. Products defined as innovative in Fisher's taxonomy......Purpose – The purpose of this paper is to explore the impact of the product residual value (PRV) and the loss of value over time of returned products in the reverse supply chain configuration. It also examines whether or not the distinction of Fisher's functional and innovative products holds...... correspond to disposed products with high residual value, whereas functional products correspond to disposed products with low residual value. Furthermore, the PRV and the speed at which returned products lose their value are considered in order to determine the configuration of the reverse supply chain...

  8. Markov chains and mixing times

    CERN Document Server

    Levin, David A; Wilmer, Elizabeth L

    2009-01-01

    This book is an introduction to the modern approach to the theory of Markov chains. The main goal of this approach is to determine the rate of convergence of a Markov chain to the stationary distribution as a function of the size and geometry of the state space. The authors develop the key tools for estimating convergence times, including coupling, strong stationary times, and spectral methods. Whenever possible, probabilistic methods are emphasized. The book includes many examples and provides brief introductions to some central models of statistical mechanics. Also provided are accounts of r

  9. Quantum crystals and spin chains

    Energy Technology Data Exchange (ETDEWEB)

    Dijkgraaf, Robbert [KdV Institute for Mathematics, University of Amsterdam, Plantage Muidergracht 24, 1018 TV Amsterdam (Netherlands); Institute for Theoretical Physics, University of Amsterdam, Valckenierstraat 65, 1018 XE Amsterdam (Netherlands); Orlando, Domenico [Institut de Physique, Universite de Neuchatel, Rue Breguet 1, CH-2000 Neuchatel (Switzerland); Reffert, Susanne [Institute for Theoretical Physics, University of Amsterdam, Valckenierstraat 65, 1018 XE Amsterdam (Netherlands)], E-mail: sreffert@gmail.com

    2009-04-21

    In this article, we discuss the quantum version of the melting crystal corner in one, two, and three dimensions, generalizing the treatment for the quantum dimer model. Using a mapping to spin chains we find that the two-dimensional case (growth of random partitions) is integrable and leads directly to the Hamiltonian of the Heisenberg XXZ ferromagnet. The three-dimensional case of the melting crystal corner is described in terms of a system of coupled XXZ spin chains. We give a conjecture for its mass gap and analyze the system numerically.

  10. Quantum crystals and spin chains

    Science.gov (United States)

    Dijkgraaf, Robbert; Orlando, Domenico; Reffert, Susanne

    2009-04-01

    In this article, we discuss the quantum version of the melting crystal corner in one, two, and three dimensions, generalizing the treatment for the quantum dimer model. Using a mapping to spin chains we find that the two-dimensional case (growth of random partitions) is integrable and leads directly to the Hamiltonian of the Heisenberg XXZ ferromagnet. The three-dimensional case of the melting crystal corner is described in terms of a system of coupled XXZ spin chains. We give a conjecture for its mass gap and analyze the system numerically.

  11. Thermodynamics of Dipolar Chain Systems

    DEFF Research Database (Denmark)

    R. Armstrong, J.; Zinner, Nikolaj Thomas; V. Fedorov, D.

    2012-01-01

    The thermodynamics of a quantum system of layers containing perpendicularly oriented dipolar molecules is studied within an oscillator approximation for both bosonic and fermionic species. The system is assumed to be built from chains with one molecule in each layer. We consider the effects...... numerically. Our findings indicate that thermodynamic observables, such as the heat capacity, can be used to probe the signatures of the intralayer interaction between chains. This should be relevant for near future experiments on polar molecules with strong dipole moments....

  12. Reseach of Supply Chain Modeling Technology

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    The supply chain modeling technology is research. Firstly, the concept of supply chain and supply chain management is introduced. Secondly, enterprise-modeling methods, such as CIM-OSA, GIM-GRAI, PERA and ARIS, are analyzed and compared. The supply chain modeling technology is studied. Then the ARIS-based supply chain modeling method is proposed and the supply chain operation reference model is set up. Finally, the applications of ARIS-based supply chain modeling method in Shanghai Turbine Generator Co. Ltd. (STGC) is described in detail.

  13. Supply chain management and optimization in manufacturing

    CERN Document Server

    Pirim, Harun; Yilbas, Bekir Sami

    2014-01-01

    This book introduces general supply chain terminology particularly for novice readers, state of the art supply chain management and optimization issues and problems in manufacturing. The book provides insights for making supply chain decisions, planning and scheduling through supply chain network. It introduces optimization problems, i.e. transportation of raw materials, products and location, inventory of plants, warehouses and retailers, faced throughout the supply chain network.

  14. Precise low cost chain gears for heliostats

    Science.gov (United States)

    Liedke, Phillip; Lewandowski, Arkadiusz; Pfahl, Andreas; Hölle, Erwin

    2016-05-01

    This work investigates the potential of chain gears as precise and low cost driving systems for rim drive heliostats. After explaining chain gear basics the polygon effect and chain lengthening are investigated. The polygon effect could be measured by a heliostat with chain rim gear and the chain lengthening with an accordant test set up. Two gear stages are scope of this work: a rim gear and an intermediate gear. Dimensioning, pretensioning and designing for both stages are explained.

  15. Social Value Propagation for Supply Chain Formation

    OpenAIRE

    2013-01-01

    Supply Chain Formation is the process of determining the participants in a supply chain, who will exchange what with whom, and the terms of the exchanges. Decentralized supply chain formation appears as a highly intricate task because agents only possess local information, have limited knowledge about the capabilities of other agents, and prefer to preserve privacy. State-of-the-art decentralized supply chain formation approaches can either: (i) #12;find supply chains of high value at the ...

  16. Information system for the supply chain management

    OpenAIRE

    Delia Adriana Marincas

    2008-01-01

    Supply chain management SCM is the integration and management of supply chain organizations and activities through collaboration, effective business processes and high levels of information sharing. The supply chain concept has become a concern due to global competition and increasing customer demand for value. Thus, the information must be available in real time across the supply chain and this can not be achieved without an integrated software system for supply chain management. Supply chai...

  17. OVERVIEW OF CHINESE CHAIN CATERING MARKET

    OpenAIRE

    2012-01-01

    This thesis is a market overview for chain catering business situation in China. Chinese chain catering market is developing rapidly in recent years, it is a business where everybody can become a customer, but the business is highly competitive. The subject of this thesis is to give an overview of the market situation and strategies for market expansion of Chinese chain catering industry. It contains knowledge of chain management and introduction of Chinese chain catering ma...

  18. SUPPLY CHAIN MANAGEMENT – KEY FACTORS

    OpenAIRE

    Magdalena Daniela DINU

    2014-01-01

    This paper exposes Supply Chain Management by its key factors. Briefly, where the Supply Chain Management is treated as strategic part of a company then maintaining both control and influence throughout the entire supply chain are key factors and critical to success. On the other hand, finding the right partner to manage the non-strategic Supply Chains would be another key factor too. To define the most important key factors within Supply Chain Management means a deeply understanding of bot...

  19. Research on Integrated Green Supply Chain Management

    Institute of Scientific and Technical Information of China (English)

    DENG Lei; WANG Xu

    2006-01-01

    On the basis of the analyzing product life cycle and value chain management in green supply chain, integrated green supply chain is put forward and constructed which involve lean production, agile manufacturing and green supply chain. This integrated structure provides an effective method for resolving some questions such as cost, market, environment, etc. in enterprise. A case study is presented at the end of paper to demonstrate how integrated supply chain implemented successfully in enterprise.

  20. Finite Element Analysis of Screw Conveyor of Horizontal Screw Centrifuge with Large Aspect Ratio%大长径比卧螺离心机螺旋输送器的有限元分析

    Institute of Scientific and Technical Information of China (English)

    杨钊; 黄维菊; 高志惠; 陈文梅

    2011-01-01

    应用SolidWorks对大长径比卧螺离心机的转鼓-螺旋输送器系进行了三维建模,采用与SolidWorks无缝衔接的有限元分析插件Simulation对其进行了有限元仿真。通过SolidWorks Simulation对螺旋输送器在正常工况下的整体结构进行了静力分析和模态分析,得到了螺旋输送器前5阶固有频率、应力分布和径向、轴向变形。研究了导程、转速和叶片厚度等主要参数的变化对螺旋输送器应力和变形的影响,以实现对离心机的优化。通过对大长径比卧螺离心机和普通卧螺离心机转鼓-螺旋输送器系的比较,在保证强度、刚度要求和相同生产能力的条件下,大长径比卧螺离心机具有更强的分离能力,螺旋输送器具有更好的应力和变形分布,并且临界转速也得到了提高。%The drum and screw conveyor of Horizontal Screw Centrifuge with Large Aspect Ratio are modeled by SolidWorks.FEA simulation was conducted by a finite element analysis software-Simulation embedded in SolidWorks,Mode and static monolithic structure of the screw conveyor under the normal working state was analysed.The 5 rank frequencies,stress distribution,the radial and axial deformation were obtained.Through changing parameters such as the lead 、the half cone angle rotational speed and the blade thickness,the paper investigates the impact of parameters on the strength,displacement and vibration form,in order to realize the optimization of centrifuge.The comparison between the common drum with the Large Aspect Ratio one was implemented,the paper finds that the former has a better separation capacity,better stress and deformation distribution of screw conveyor and the rotors has higher critical speed.

  1. 输送机非线性动力学的研究及其对动态性能的影响%Study on conveyor non-linear dynamics and its effect on dynamic behavior

    Institute of Scientific and Technical Information of China (English)

    李光布

    2004-01-01

    A conveyor linear system assumption is based on an approximate description of belt mechanics behavior and constant elastic module. It produces analysis errors and improper dynamics simulation in large conveyors. The belt non-linear characteristics based on sag are described and the belt equivalent elastic module expression is deduced. The relationship between belt-equivalent elastic module and elastic module is studied, and their ratio varies from 0. 1 to 1. 0. The non-linear motion equation with a lumped element model is put forward. Its increment equation and numerical solution are built. A dynamics simulation on a conveyor is carried out, mainly to calculate and compare belt speed, acceleration, tension, displacement of gravity take-up and wave period with linear and non-linear models. It shows that the simulation errors between two models vary from 6% to 50%.%输送机线性系统的假设是在胶带力学特性和弹性模量不变的情况下近似提出的. 这种假设会使大型输送机产生理论误差和不正确的动力学仿真结果. 本文分析了基于胶带悬垂度的非线性特性, 推导了等效弹性模量的表达式, 研究了胶带等效弹性模量和弹性模量之间的关系, 并发现两者的比值在0. 1~1. 0之间变化. 提出了输送机有限单元模型的非线性运动方程及其增量方程和数值解法. 通过对一输送机动态特性的仿真分析, 发现用线性和非线性2种模型, 它们动态参数(如带速, 胶带加速度, 张力以及重锤位移和张力波速)的计算误差介于6%~50% 之间.

  2. Quadratic Variation by Markov Chains

    DEFF Research Database (Denmark)

    Hansen, Peter Reinhard; Horel, Guillaume

    We introduce a novel estimator of the quadratic variation that is based on the the- ory of Markov chains. The estimator is motivated by some general results concerning filtering contaminated semimartingales. Specifically, we show that filtering can in prin- ciple remove the effects of market...

  3. Spin Chains and Gustafson's Integrals

    CERN Document Server

    Derkachov, S E

    2016-01-01

    The Gustafson's integrals are the multidimensional generalization of the classical Mellin--Barnes integrals. We show that some of these integrals arise from relations between matrix elements in the Sklyanin's representation of Separated Variables in the spin chain models. We also present several new integrals.

  4. Concurrent Product & Supply Chain Creation

    DEFF Research Database (Denmark)

    Gubi, Ebbe

    it is a structural premise. We also know that logistics costs generally are estimated 15-20% of total product costs. Accordingly, it stands to reason that a company can reduce costs, and thereby gain an edge on its competitors, by tailoring the supply chain in question to an individual product or product family; i...

  5. Replicator dynamics in value chains

    DEFF Research Database (Denmark)

    Cantner, Uwe; Savin, Ivan; Vannuccini, Simone

    2016-01-01

    dynamics may revert its effect. In these regressive developments of market selection, firms with low fitness expand because of being integrated with highly fit partners, and the other way around; ii) allowing partner's switching within a value chain illustrates that periods of instability in the early...

  6. Maximal right smooth extension chains

    CERN Document Server

    Huang, Yun Bao

    2010-01-01

    If $w=u\\alpha$ for $\\alpha\\in \\Sigma=\\{1,2\\}$ and $u\\in \\Sigma^*$, then $w$ is said to be a \\textit{simple right extension}of $u$ and denoted by $u\\prec w$. Let $k$ be a positive integer and $P^k(\\epsilon)$ denote the set of all $C^\\infty$-words of height $k$. Set $u_{1},\\,u_{2},..., u_{m}\\in P^{k}(\\epsilon)$, if $u_{1}\\prec u_{2}\\prec ...\\prec u_{m}$ and there is no element $v$ of $P^{k}(\\epsilon)$ such that $v\\prec u_{1}\\text{or} u_{m}\\prec v$, then $u_{1}\\prec u_{2}\\prec...\\prec u_{m}$ is said to be a \\textit{maximal right smooth extension (MRSE) chains}of height $k$. In this paper, we show that \\textit{MRSE} chains of height $k$ constitutes a partition of smooth words of height $k$ and give the formula of the number of \\textit{MRSE} chains of height $k$ for each positive integer $k$. Moreover, since there exist the minimal height $h_1$ and maximal height $h_2$ of smooth words of length $n$ for each positive integer $n$, we find that \\textit{MRSE} chains of heights $h_1-1$ and $h_2+1$ are good candidates t...

  7. Towards biotracing in food chains

    DEFF Research Database (Denmark)

    Hoorfar, Jeffrey; Wagner, Martin; Jordan, Kieran

    2011-01-01

    , and 21 cross-disciplinary work packages that cover tracing and tracking of contamination in feed, meat and dairy chains, in addition to accidental and deliberate contamination of bottled water. The BIOTRACER Consortium consists of 46 partners, including Europe's largest food/feed industries, several SMEs...

  8. Supply Chain Simulation : A Survey

    NARCIS (Netherlands)

    Kleijnen, J.P.C.

    2003-01-01

    This paper provides a survey of simulation in supply chain management.It reviews four types of simulation, namely spreadsheet simulation, system dynamics, discreteevent simulation, and business games.Which simulation type should be applied, depends on the type of managerial question to be answered b

  9. Labour in Global Value Chains

    DEFF Research Database (Denmark)

    Lund-Thomsen, Peter; Nadvi, Khalid; Chan, Anita

    2012-01-01

    A critical challenge facing developing country producers is to meet international labour standards and codes of conduct in order to engage in global value chains. Evidence of gains for workers from compliance with such standards and codes remains limited and patchy. This article focuses on the gl......A critical challenge facing developing country producers is to meet international labour standards and codes of conduct in order to engage in global value chains. Evidence of gains for workers from compliance with such standards and codes remains limited and patchy. This article focuses...... on the global football industry, a sector dominated by leading global brands that manage dispersed global value chains. It assesses the working conditions for football stitchers engaged in different forms of work organization, factories, stitching centres and home-based settings in Pakistan, India and China...... production contexts that influence work conditions. In doing so, it argues that current debates on the role of labour in global value chains have to go beyond a narrow focus on labour standards and corporate social responsibility compliance and engage with economic, technological and social upgrading...

  10. Supply chain challenges. building relationships.

    Science.gov (United States)

    Beth, Scott; Burt, David N; Copacino, William; Gopal, Chris; Lee, Hau L; Lynch, Robert Porter; Morris, Sandra

    2003-07-01

    Supply chain management is all about software and systems, right? Put in the best technology, sit back, and watch as your processes run smoothly and the savings roll in? Apparently not. When HBR convened a panel of leading thinkers in the field of supply chain management, technology was not top of mind. People and relationships were the dominant issues of the day. The opportunities and problems created by globalization, for example, are requiring companies to establish relationships with new types of suppliers. The ever-present pressure for speed and cost containment is making it even more important to break down stubbornly high internal barriers and establish more effective cross-functional relationships. The costs of failure have never been higher. The leading supply chain performers are applying new technology, new innovations, and process thinking to far greater advantage than the laggards, reaping tremendous gains in all the variables that affect shareholder value: cost, customer service, asset productivity, and revenue generation. And the gap between the leaders and the losers is growing in almost every industry. This roundtable gathered many of the leading thinkers and doers in the field of supply chain management, including practitioners Scott Beth of Intuit, Sandra Morris of Intel, and Chris Gopal of Unisys. David Burt of the University of San Diego and Stanford's Hau Lee bring the latest research from academia. Accenture's William Copacino and the Warren Company's Robert Porter Lynch offer the consultant's perspectives. Together, they take a wide-ranging view of such topics as developing talent, the role of the chief executive, and the latest technologies, exploring both the tactical and the strategic in the current state of supply chain management.

  11. Kinematic analysis of U-type slide conveyor based on MATLAB%基于MATLAB的U型滑道输送链运动学分析

    Institute of Scientific and Technical Information of China (English)

    李英杰; 洪林; 尹瑞华

    2015-01-01

    针对一种特殊工况下的低速重载输送链———U型滑道约束输送链,分析了主动链轮运动一个周期的时间内,链节在主从动链轮啮合区域及位置补偿区域内的运动状态。根据闭环矢量法建立机构的位移矢量方程,采用MATLAB软件对机构进行运动学分析,得出各部分机构的运动曲线。运动学分析的结果为U型输送链的动力学分析及速度补偿奠定有利的基础。%For a special kind of slow-speed overloading transmission chain-U-type slide constrained chain , this paper analyses motion of link into active chain sprocket engagement area , position compensation area , and leav-ing active chain sprocket engagement area in a cycle motion process of active chain sprocket .The displacement vector equation of the mechanism is established by closed-loop vector method .Using MATLAB software to ana-lyze the kinematic of mechanism and draw the kinematic curve of each component part .The result of kinematic analysis provides powerful basis and reference for the kinetic analysis and speed compensation of U -type slide constrained chain .

  12. Supply Chain Management Practices in Toy Supply Chains

    DEFF Research Database (Denmark)

    Wong, Chee Yew; Arlbjørn, Jan Stentoft; Johansen, John

    2005-01-01

    qualitative semi-structured interviews and questionnaire with 11 main European toy retailers. Findings - The study concludes that there are three main SCM practices for toy retailers in terms of ordering behaviours (one-off, JIT, and mixed model), and one dominated SCM practice for toy manufacturers...... are required for such extreme volatility and seasonality are proposed. Originality/value - It reveals actual SCM practices in a volatile and seasonal supply chain, such that theoretical and practical gaps are identified. Also, it proposes a model to match manufacturing SCM-practices with retailer SCM-practices.......Purpose - Innovative products usually experience highly unpredictable and variable demand. This is especially valid for the volatile and seasonal toy industry, which produces high obsolete inventory, lost sales and markdown. In such a volatile industry, what supply chain management (SCM) practices...

  13. Supply Chain Management Performance in Tourism. Continental Hotels Chain Case

    OpenAIRE

    Gabriela Ţigu; Bogdan Călăreţu

    2013-01-01

    With its origins in logistics, Supply Chain Management (SCM) concept is covering all managerial aspects of the flow of materials and information from source to customer, across the entire range of materials handling and movement functions, and throughout an organization and its supply channels. In tourism, these issues relate to the whole process of providing tourism services from sourcing of raw materials, products or different services) to supply and distribution, and SCM performance can ul...

  14. 输送机内、外链板冲孔模具的设计与工艺优化%Designing & Process Optimization of the Punching Mould of Inner/Outer Scraping Blade on Conveyor

    Institute of Scientific and Technical Information of China (English)

    林广学; 闫秀梅

    2011-01-01

    In order to increase the Machining accuracy and efficiency of the inner/outer scraping blade on conveyor, one new designed punching mould was introduced in this paper. It improved the accuracy and efficiency of punching the inner hole of the scraping blade, insured the product quality.%为了提高输送机内、外链板孔的加工精度及加工效率,该文设计了一套新型链板冲孔模具,可以准确、高效地加工输送机链板内孔,确保了产品质量。

  15. Application of Control System for “green”rail roller conveyor%“绿色”钢轨辊道输送机控制系统的应用

    Institute of Scientific and Technical Information of China (English)

    郭鲁宁; 郭晋龙; 蔡庄厚; 赵子龙

    2011-01-01

    The Control System of "green"rail roller conveyor was with advanced facilities, well-planned layout, high level of mechanization, finished structure, little floor area, high production efficiency. It was up to the national environmental standards for modernized rails welding production line.%“绿色”钢轨辊道输送机系统设施先进,布局合理,机械化程度高,具有结构精巧,占地面积少,节电能力强,生产效率高的特点,符合国家环保标准的现代化焊轨生产线要求.

  16. Vibration test and fault diagnosis of belt conveyor drive unit%带式输送机驱动装置振动测试与故障诊断

    Institute of Scientific and Technical Information of China (English)

    盛延忠

    2011-01-01

    结合西基港务分公司带式输送机驱动装置振动监测与分析实践,阐述了振动频谱分析技术在减速器中的应用,分析诊断结果与实际情况高度一致,可为同类设备预测维修实践提供参考.%Combining the vibration monitoring and analysis of the belt conveyor drive unit in Guangzhou Port Group Co. , Ltd. Xiji Stevedoring Branch Company, the paper describes the application of vibration spectrum analysis technology,and the analysis and diagnosis results is highly in consistent with the actual situation, providing reference for the predictive maintenance practices of similar equipment.

  17. chains

    Directory of Open Access Journals (Sweden)

    Gabriel Pérez-Salas

    2015-01-01

    Full Text Available Las barreras y aranceles al comercio exterior han disminuido significativamente gracias a los acuerdos multilaterales y los mecanismos de integración entre las naciones. Los costos logísticos representan una proporción significativa del precio final de los artículos, especialmente de los commodities. Por esta razón, minimizar los costos logísticos es un desafío importante para las naciones para fomentar la competitividad del comercio exterior y en particular para aprovechar la renta de los recursos naturales. En este artículo, proponemos un marco de referencia integral para la medición de costos logísticos, enfocado en determinar los extra-costos que resultan por procedimientos ineficientes y la falta de políticas públicas y regulaciones de las entidades públicas. Estos elementos no han sido considerados en la literatura, y este artículo aborda esta brecha. Como caso de estudio, presentamos la aplicación del marco de referencia para estimar los extra-costos en algunas cadenas logísticas de recursos naturales en Bolivia. Se presenta una discusión de los resultados encontrados, así como recomendaciones para trabajo futuro.

  18. 一种基于第二代电流传输器的积分器设计%Design of an integrator based on second generation current conveyors

    Institute of Scientific and Technical Information of China (English)

    邓盼盼

    2012-01-01

    介绍了一种基于低压、宽带、轨对轨、自偏置CMOS第二代电流传输器(CCⅡ)的电流模式积分器电路,能广泛应用于无线通讯、射频等高频模拟电路中。通过采用0.18μm工艺参数,进行Hspice仿真,结果表明:电流传输器电压跟随的线性范围为-1.04~1.15V,电流跟随的线性范围为-9.02~6.66mA,iX/iZ的-3dB带宽为1.6GHz。输出信号的幅度以20dB/decade的斜率下降,相位在低于3MHz的频段上保持在90°。%An integrator based on low-vohage,wideband, rail-to-rail and self-biased CMOS second generation current conveyor (CCⅡ) is proposed,which is widely used in wireless communications, RF and other high-frequency analog circuits. Using 0.18urn CMOS process parameters, the Hspice simulation showed that the following voltage of the current conveyor varies linearly from -1.04V to 1.15V, and the linear range of the following current is -9.02mA-6.66mA. The iX/iZ has -3dB bandwidth of 1.6GHz. The output amplitude decreases on the slope of 20dB/decade, and the phase remains 90 degree when the frequency is below 3 MHz.

  19. Analysis on the Use of Differential Mechanism in the Double Driving System of Large Belt Conveyor%浅析差速器在大型带式输送机双驱动系统中的应用

    Institute of Scientific and Technical Information of China (English)

    刘芳忠; 陈国敏; 刘永钰

    2013-01-01

    This paper described the load distribution principle of double driving belt conveyor,and pointed out the shortcomings and deficiencies of the double driving system currently used.Based on the characteristics of double driving of belt conveyor,we put forward a new type of double driving which uses differential mechanism to distribute the loads,and introduced how it works. In this paper,the model of the new type double driving system was established,and the dynamic simulation was done.The results proved that the drive system can make the loads distributed ideally between the two drums and the two motors.%简要阐述了双驱动胶带输送机负载分配的原理,指出了当前使用的双驱动方式存在的缺点和不足。基于双驱动带式输送机的传动特点,本文提出一种新型的,使用差速器对动力进行分配的带式输送机双驱动方式,介绍了差速器以及该新型双驱动系统的工作原理,并在 ADAMS 中建立了该驱动系统模型,进行了动力学仿真,分析了仿真结果,证明该驱动系统可以在双滚筒及双电机之间进行理想的动力分配。

  20. 刮板输送机中部槽关键部件磨损形貌及影响因素分析%Analysis of Wear Appearance and Influence Factors of Middle Chute Critical Components in Scraper Conveyor

    Institute of Scientific and Technical Information of China (English)

    史志远

    2016-01-01

    To the large amount troubles that caused by middle chute wear in scraper conveyor, and some coherent company of scraper conveyor was invested, which included typical coal mine, manufacturing enterprise, filed service and detection center and so on. Based on modern tribology, interaction principle and fatigue damage theory, with structural composition of middle chute and serv-ice condition, then the material of wear chute samples were studied. And the basic wear appearance of middle chute was put forward, and the important influence factors that caused middle chute wear appearance were analyzed form different service condition.%针对刮板输送机中部槽磨损严重造成故障多发的情况,调研了典型煤矿用户、生产企业、维修现场及检测检验中心等刮板输送机相关单位,根据现代摩擦学理论、交互作用原理及疲劳损伤理论,结合中部槽结构组成及使用工况,对调研获得的磨损样槽资料进行了研究,总结出了中部槽的基本磨损形貌,并从不同类型的工况环境中分析出了形成中部槽磨损状态的重要影响因素。

  1. The fishing industry - toward supply chain modelling

    DEFF Research Database (Denmark)

    Jensen, Toke Koldborg; Nielsen, Jette; Larsen, Erling P.

    Mathematical models for simulating and optimizing supply chain aspects such as distribution planning and optimal use of raw materials are widely used. However, modelling based on a holistic chain view is less studied, and food-related aspects such as quality and shelf life issues enforce additional...... requirements onto the chains. In this paper, we consider the supply chain structure of the Danish fishing industry and illustrate the potential of using mathematical models to identify quality and value-adding activities. This is a first step toward innovative supply chain modelling aimed to identify benefits...... for actors along chains in the fishing industry....

  2. The chain relation in sofic subshifts

    CERN Document Server

    Kazda, Alexandr

    2009-01-01

    The paper gives a characterisation of the chain relation of a sofic subshift. Every sofic subshift $\\Sigma$ can be described by a labelled graph $G$. Factorising $G$ in a suitable way we obtain the graph $G/_\\approx$ that offers insight into some properties of the original subshift. Using $G/_\\approx$ we describe first the chain relation in $\\Sigma$, then characterise chain-transitive sofic subshifts, chain-mixing sofic subshifts and finally the attractors of the subshift dynamic system. At the end we present (straightforward) algorithms deciding chain-transitivity and chain-mixing properties of a sofic subshift and listing all the attractors of the subshift system.

  3. VALUE CHAINS IN EMERGING MARKETS

    Directory of Open Access Journals (Sweden)

    Abdyramanova, Z.

    2016-11-01

    Full Text Available The textiles sector is one of the main industry sectors in Kyrgyzstan in terms of output, employment and increasingly exports. Textile clusters are developing and patterns in cluster formations are emerging that reflect the differing economic conditions of the regions, demonstrating particular influences on the value chain. These differences are both depicted in the two regions of Kyrgyzstan-south and north. In the north of the Republic the infrastructure is more developed, there is greater facility to access international markets (exports. In the south the infrastructure is less developed, and garment producers in the region serve mainly local niche and near-neighbour markets. The research objective is to assess the key drivers of the value chain and profitability in the textiles sector in Kyrgyzstan, by comparing the garment sewing sector in the two contrasting regions of south and north Kyrgyzstan.

  4. Formation of helical ion chains

    CERN Document Server

    Nigmatullin, Ramil; De Chiara, Gabriele; Morigi, Giovanna; Plenio, Martin B; Retzker, Alex

    2011-01-01

    We study the nonequilibrium dynamics of the linear to zigzag structural phase transition exhibited by an ion chain confined in a trap with periodic boundary conditions. The transition is driven by reducing the transverse confinement at a finite quench rate, which can be accurately controlled. This results in the formation of zigzag domains oriented along different transverse planes. The twists between different domains can be stabilized by the topology of the trap and under laser cooling the system relaxes to a helical chain with possibly nonzero winding number. Molecular dynamics simulations are used to obtain a large sample of possible trajectories for different quench rates. The scaling of the average winding number with different quench rates is compared to the prediction of the Kibble-Zurek theory, and a good quantitative agreement is found.

  5. Supply Chain Reorganization and Coordination

    Institute of Scientific and Technical Information of China (English)

    WANG Feng-bin

    2001-01-01

    Three generic forms of governance--hierarchy, hybrid and market are proposed in the newinstitutional economics, giving an abstract description of alternative coordination and control mechanisms forgeneral use. While this theory is known as far away from being operational and specified, a few researchersin the management and organization area are trying to extend Galbraith and/or Mintzberg's organizationaldesign theories into the application of logistical coordination for obtaining a smooth flow of products along thesupply chain within and without the focal organization. In this paper, we present an explorative case study onthe design of various organizational architectures of logistics activities and their relevant coordinationmechanisms, especially internal and external contracts as one new kind of hybrid mechanisms forcoordinating effective supply chains.

  6. Mobilizing Sustainable Bioenergy Supply Chains

    OpenAIRE

    Baxter, David; Cowie, Annette; BERNDES Goran; Junginger, Martin; MCMILLAN James D; Saddler, J N; VAN REE Rene

    2015-01-01

    Analysis of the five globally significant supply chains conducted by IEA Bioenergy inter-Task teams – boreal and temperate forests, agricultural crop residues, biogas, lignocellulosic crops, and cultivated grasslands and pastures in Brazil – has confirmed that feedstocks produced using logistically efficient production systems can be mobilized to make significant contributions to achieving global targets for bioenergy. However, the very significant challenges identified in this report indi...

  7. China's Role in Purchasing Chain

    Institute of Scientific and Technical Information of China (English)

    Eva; Alice

    2007-01-01

    @@ In current world market,"Made-in-China"often means good price and competitive quality.In terms of China's trade pattern,more than half of Chinese exporting products belong to processing trade industry according to the demands and requirements of international orders.On the purchasing chain,China is learning from its international partners.Safety and quality always tops all issues.

  8. The dynamic chain event graph

    OpenAIRE

    2015-01-01

    In this paper we develop a formal dynamic version of Chain Event Graphs (CEGs), a particularly expressive family of discrete graphical models. We demonstrate how this class links to semi-Markov models and provides a convenient generalization of the Dynamic Bayesian Network (DBN). In particular we develop a repeating time-slice Dynamic CEG providing a useful and simpler model in this family. We demonstrate how the Dynamic CEG’s graphical formulation exhibits asymmetric conditional independence...

  9. On Markov Chains and Filtrations

    OpenAIRE

    1997-01-01

    In this paper we rederive some well known results for continuous time Markov processes that live on a finite state space.Martingale techniques are used throughout the paper. Special attention is paid to the construction of a continuous timeMarkov process, when we start from a discrete time Markov chain. The Markov property here holds with respect tofiltrations that need not be minimal.

  10. Modeling Continuous IED Supply Chains

    Science.gov (United States)

    2014-03-27

    criminals, pirates, drug traffickers and terrorists. Moreover, JIEDDO has pointed out the spread of IED use to places such as Thailand and Norway. U.S... human networks that place IEDs. Dekker categorizes two main human aspects of IED placement. The first is motivation which 8 affects the number of...methods provided in this thesis and apply them to combat other threats. For example, drug trafficking supply chains. IED and drug trafficking supply

  11. Supply-Chain Risk Analysis

    Science.gov (United States)

    2016-06-07

    Classic Buffer Overflow 1. http://cwe.mitre.org/top25/ SANS (SysAdmin, Audit, Network , Security ) Institute 23 Veracode: State of Software Security ...Approved for public release; distribution unlimited 13. SUPPLEMENTARY NOTES 14. ABSTRACT 15. SUBJECT TERMS 16. SECURITY CLASSIFICATION OF: 17...supply-chain risks. He participated in the design and development of the DHS Build- Security -In Web site and continues to contribute articles to it

  12. Synchronization Algorithms on Oriented Chains

    Directory of Open Access Journals (Sweden)

    D. Bein

    2008-01-01

    Full Text Available We present a space- and time-optimal self-stabilizing algorithm, SSDS, for a given synchronization problem on asynchronous oriented chains. SSDS is uniform and works under the unfair distributed daemon. From SSDS we derive solutions for the local mutual exclusion and distributed sorting. Algorithm SSDS can also be used to obtain optimal space solutions for other problems such as broadcasting, leader election, and mutual exclusion.

  13. Supply Chain Performance Evaluation: Trends and Challenges

    Directory of Open Access Journals (Sweden)

    Ezutah U. Olugu

    2009-01-01

    Full Text Available Problem statement: In today’s manufacturing world, globalization policies and rejuvenation have created a more intensive competition amongst manufacturers. On the other hand, manufacturers have turned to the option of adopting innovative technologies, process re-engineering and strategies such as efficient supply chain management to achieve a sustainable competitive advantage. Effective supply chain performance measurement has been identified as a key issue towards efficient supply chain management. To explore the extent of research in supply chain performance measurement and establish the gap in knowledge in supply chain performance measurement using fuzzy logic operation. Approach: Literatures in the area of supply chain performance measurement had been extensively reviewed. Both traditional and fuzzy logic approaches to supply chain performance measurement were scrutinized. Further scrutiny was carried out to establish potential research areas in the application of fuzzy logic operations in supply chain performance measurement. Results: The supply chain performance measurement using fuzzy logic operation was identified as a new direction in measuring the uncertainty and ambiguity surrounding supply chain performance measurement. Direction for further studies in the application of fuzzy logic operation in supply chain management and its performance measurement were also identified. Conclusion: Result of this study implied that there is still a gap in knowledge in the area of supply chain performance measurement. This new direction of studies involved extending the existing supply chains to incorporate product recovery after the useful life.

  14. ARCHITECTURAL CONCEPTS FOR VALUE CHAINS

    Directory of Open Access Journals (Sweden)

    A.C. Janse van Rensburg

    2012-01-01

    Full Text Available

    ENGLISH ABSTRACT:The Porter Value Chain has been widely adopted by the business community as a mechanism to understand and comprehend complexity in business environments, with the ultimate goal of structuring the business to maximize its competitive advantage. Implementing the Value Chain is not easy: a number of organizations can testify to their failure to derive any benefits at all from this concept. To overcome this problem, an approach is presented to assist the organization in creating a Value Chain reference model within the broader context of the organization’s enterprise architecture.

    AFRIKAANSE OPSOMMING: Die “Porter Waardeketting” is ’n algemene aanvaarde praktyk wat deur maatskappye gebruik word om die kompleksiteit van besigheidsomgewings mee te verstaan. Die uiteindelike doel hiervan is om die besigheid se mededings voordele te optimiseer. Om die Waardekettingkonsep te implementeer, is nie ’n maklike taak nie – verskeie organisasies kan getuig van mislukte implementeringspogings. Hierdie artikel beskryf ’n benadering beskryf wat gebruik kan word om die organisasie te help om ’n Waardekettingmodel te skep in die bree konteks van die organisasie se besigheidsargitektuur.

  15. Towards biotracing in food chains.

    Science.gov (United States)

    Hoorfar, Jeffrey; Wagner, Martin; Jordan, Kieran; Bouquin, Solveig Lind; Skiby, Jeffrey

    2011-03-01

    Biotracing is tracing (backward)/tracking (forward) biological contamination in the food/feed chain. Advances in detection technologies, improvements in molecular marker identification, clearer understanding of pathogenicity markers, improved modelling methodologies and, more importantly, the integration of these disciplines will lead to better capability in full-chain tracing and tracking biological contaminations (biotracing). The advantages of improved biotraceability are faster intervention, limited recalls and more targeted remedial action. The project is not dealing with risk assessments but developing tools that can be used in "second-generation" risk assessments involving quantitative microbiology. This concept is the core activity of BIOTRACER, which is an Integrated Project (2007-2011) funded by the EU 6th Framework Programme. The research in biotracing is organised into five Research Areas, and 21 cross-disciplinary work packages that cover tracing and tracking of contamination in feed, meat and dairy chains, in addition to accidental and deliberate contamination of bottled water. The BIOTRACER Consortium consists of 46 partners, including Europe's largest food/feed industries, several SMEs, and relevant International Cooperation (INCO) countries. The Consortium includes experts in predictive microbiology, database developers, software companies, risk assessors, risk managers, system biologists, food and molecular microbiologists, legislative officers, standardization and validation members and food retailers. The outcomes will ensure a more reliable and rapid response to a microbial contamination event.

  16. Polymerization as a Model Chain Reaction

    Science.gov (United States)

    Morton, Maurice

    1973-01-01

    Describes the features of the free radical, anionic, and cationic mechanisms of chain addition polymerization. Indicates that the nature of chain reactions can be best taught through the study of macromolecules. (CC)

  17. Supply chain strategies, issues and models

    CERN Document Server

    Ramanathan, Ramakrishnan

    2014-01-01

    In the 21st century, supply chain operations and relationships among supply chain partners have become highly challenging, necessitating new approaches, e.g., the development of new models. Supply Chain Strategies, Issues and Models discusses supply chain issues and models with examples from actual industrial cases. Expert authors with a wide spectrum of knowledge working in various areas of supply chain management from various geographical locations offer refreshing, novel and insightful ideas and address possible solutions using established theories and models. Supply Chain Strategies, Issues and Models features studies that have used mathematical modeling, statistical analyses and also descriptive qualitative studies. The chapters cover many relevant themes related to supply chains and logistics including supply chain complexity, information sharing, quality (six sigma), electronic Kanbans, inventory models, scheduling, purchasing and contracts. To facilitate easy reading, the chapters that deal with suppl...

  18. SUPPLY CHAIN MANAGEMENT – KEY FACTORS

    Directory of Open Access Journals (Sweden)

    Magdalena Daniela DINU

    2014-06-01

    Full Text Available This paper exposes Supply Chain Management by its key factors. Briefly, where the Supply Chain Management is treated as strategic part of a company then maintaining both control and influence throughout the entire supply chain are key factors and critical to success. On the other hand, finding the right partner to manage the non-strategic Supply Chains would be another key factor too. To define the most important key factors within Supply Chain Management means a deeply understanding of both Supply Chain’ s components, procedures, workflow, processes and the importance of Supply Chain Management into maximizing company's value. SCORE model able to provide solid information about measuring performance and identifying priorities within Supply Chain Management will help us to understand the key factors by analyzing its elements: Plan, Source, Make, Deliver,Return, Enable. These elements covers all the challenging areas from first to third tier of Supply Chain Management.

  19. Information flow in the pharmaceutical supply chain.

    Science.gov (United States)

    Yousefi, Nazila; Alibabaei, Ahmad

    2015-01-01

    Managing the supply chain plays an important role in creating competitive advantages for companies. Adequate information flow in supply chain is one of the most important issues in SCM. Therefore, using certain Information Systems can have a significant role in managing and integrating data and information within the supply chain. Pharmaceutical supply chain is more complex than many other supply chains, in the sense that it can affect social and political perspectives. On the other hand, managing the pharmaceutical supply chain is difficult because of its complexity and also government regulations in this field. Although, Iran has progressed a lot in pharmaceutical manufacturing, still there are many unsolved issues in managing the information flow in the pharmaceutical supply chain. In this study, we reviewed the benefits of using different levels of an integrated information system in the supply chain and the possible challenges ahead.

  20. BUSINESS TENDENCIES IN SERVICES WITHIN SUPPLY CHAIN

    OpenAIRE

    Beata Skowron-Grabowska

    2008-01-01

    Supply chain management has been a major component of competitive strategy to enhance organizational productivity and profitability. Client satisfaction and improvement in profitability are two basic goals while organizing supply chain. In the paper author tried to prove that there is a correlation between organization of supply chain and subjective evaluation of economic situation by enterprises. Logistics integration helps enterprises to find their place in the supply chain.

  1. Supply Chain Integration: Challenges and Solutions

    OpenAIRE

    Sweeney, Edward

    2011-01-01

    Rapid changes in technological development are forcing businesses to continuously innovate to improve their competitiveness, which is particularly evident in logistics and supply chain management (SCM), where innovation impacts both the strategic and operational levels. Supply Chain Innovation for Competing in Highly Dynamic Markets: Challenges and Solutions investigates the role of innovation in the management of supply chains of today. This book focuses on supply chain integration from both...

  2. Australian Lamb Supply Chain: A Conceptual Framework

    OpenAIRE

    Jie, Ferry

    2011-01-01

    In the last decade, supply chain management has played an important role to lead agribusiness today to succeed in their business goals, to gain competitive advantages, and to improve business performance. As the result of that, there has been extensive studying in a popular topic of strategic supply chain management in order to improve business performance as well as along supply chain performance under the real situation. This is because in current business world, supply chain practices are ...

  3. Visualisation for System Learning in Supply Chains

    Science.gov (United States)

    Lindskog, Magnus; Abrahamsson, Mats; Aronsson, Hakan

    2007-01-01

    Contemporary supply chains are vastly complex, and decisions made by actors have system-wide consequences that these might not be able to foresee. There are gaps between "best practice"-founded theory and actual practice in supply chains. To remedy this, we argue, the supply chain actors need to enhance systems knowledge. There is a need to…

  4. Learning to Integrate: Supply Chains Reconceptualised

    Science.gov (United States)

    Sense, Andrew J.; Clements, Michael D. J.

    2007-01-01

    This paper introduces and explains a conception of supply chains from a situated learning perspective. This non-conventional supply chain perspective invites the reader to consider supply chain scenarios as "situated learning opportunities involving multiple communities of practice" interacting and participating together. It is argued that by…

  5. Cellular chain formation in Escherichia coli biofilms

    DEFF Research Database (Denmark)

    Vejborg, Rebecca Munk; Klemm, Per

    2009-01-01

    In this study we report on a novel structural phenotype in Escherichia coli biofilms: cellular chain formation. Biofilm chaining in E. coli K-12 was found to occur primarily by clonal expansion, but was not due to filamentous growth. Rather, chain formation was the result of intercellular...

  6. A concept for collaborative supply chain planning

    DEFF Research Database (Denmark)

    Alfnes, E.; Dreyer, H.C.; Hvolby, Hans-Henrik

    2012-01-01

    vendors such as Oracle, SAP and I2 offer supply chain planning systems. This limits the ability for SMEs to exploit the supply chain planning options. This paper is part of a research project carried out to develop a new supply chain add-on for Microsoft AX, a very common system for SMEs. The paper...

  7. The Advancement Value Chain: An Exploratory Model

    Science.gov (United States)

    Leonard, Edward F., III

    2005-01-01

    Since the introduction of the value chain concept in 1985, several varying, yet virtually similar, value chains have been developed for the business enterprise. Shifting to higher education, can a value chain be found that links together the various activities of advancement so that an institution's leaders can actually look at the philanthropic…

  8. Secure Supply Chains: Design Restrictions & Organizational Boundaries

    NARCIS (Netherlands)

    Ludema, M.W.

    2009-01-01

    An important issue in the design of secure supply chains is the understanding of the relation between supply chains and the organizational responsibility of specific parts of these supply chains. Organizational boundaries change over time by means of vertical and/or horizontal (des)-integration and

  9. On a Result for Finite Markov Chains

    Science.gov (United States)

    Kulathinal, Sangita; Ghosh, Lagnojita

    2006-01-01

    In an undergraduate course on stochastic processes, Markov chains are discussed in great detail. Textbooks on stochastic processes provide interesting properties of finite Markov chains. This note discusses one such property regarding the number of steps in which a state is reachable or accessible from another state in a finite Markov chain with M…

  10. Compressing redundant information in Markov chains

    OpenAIRE

    2006-01-01

    Given a strongly stationary Markov chain and a finite set of stopping rules, we prove the existence of a polynomial algorithm which projects the Markov chain onto a minimal Markov chain without redundant information. Markov complexity is hence defined and tested on some classical problems.

  11. STATISTICS OF A CLASS OF MARKOV CHAINS

    Institute of Scientific and Technical Information of China (English)

    DENG Yingchun; CAO Xianbing

    2004-01-01

    In this paper we prove that the distributions of their sojourn time and hitting time at one special state for random walks which are allowed to be finite or infinite and Markov chains on star-graphs with discrete time can uniquely determine the probability distribution of the whole chains. This result also suggests a new statistical method for Markov chains.

  12. Consistency and Refinement for Interval Markov Chains

    DEFF Research Database (Denmark)

    Delahaye, Benoit; Larsen, Kim Guldstrand; Legay, Axel;

    2012-01-01

    Interval Markov Chains (IMC), or Markov Chains with probability intervals in the transition matrix, are the base of a classic specification theory for probabilistic systems [18]. The standard semantics of IMCs assigns to a specification the set of all Markov Chains that satisfy its interval...

  13. Chains versus Independents: Newspaper and Market Characteristics.

    Science.gov (United States)

    Hale, F. Dennis

    A study examined the marketing differences between large chain newspapers and small chain and independent newspapers by analyzing differences in characteristics of the newspapers, patterns of circulation, economic and social conditions of the market, and competition from other print media. The 200 newspapers studied--113 large chain and 87 small…

  14. Principles in Halal Supply Chain Management

    NARCIS (Netherlands)

    Tieman, H.; Vorst, van der J.G.A.J.; Maznah Che Ghazali,

    2012-01-01

    Purpose – The purpose of this paper is to introduce a new framework to optimise the design of halal food supply chains, called the “Halal Supply Chain Model”. In this research the main logistics business processes are defined, which are the determinants for the halal supply chain performance. Design

  15. Systematic Methodology of Integrated Supply Chain Management

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    Supply chain management (SCM) is a strategy for global competition. Th e characteristics of SCM are integration, systematic and coordination. Using sys tematic, coordination thoughts and integration theory, a new model of enterprise integration based on supply chain management is put forward and an implementing paradigm for systematic methodology of supply chain management is developed.

  16. Experiences with the Mango Chain Game

    NARCIS (Netherlands)

    Meijer, S.A.; Zuñiga-Arias, G.; Sterrenburg, S.

    2005-01-01

    The mango chain game is a simulation game used for research purposes. It facilitated studying the bargaining power of Costa Rican mango producers in international supply chains of mango. The game simulates a simplified mango export chain in which real world local producers can play the role of produ

  17. Review of Published Chain Information System Research

    NARCIS (Netherlands)

    Storer, C.E.; Trienekens, J.H.; Beulens, A.J.M.; Quaddus, M.A.

    2006-01-01

    This paper provides a review of the literature on chains and networks that examine interorganisational information systems used to manage chains of organisations. Difficulty was found in finding out how organisations exchanged information to manage relationships with customers and suppliers in chain

  18. Supply Chain Management Performance in Tourism. Continental Hotels Chain Case

    Directory of Open Access Journals (Sweden)

    Gabriela Ţigu

    2013-02-01

    Full Text Available With its origins in logistics, Supply Chain Management (SCM concept is covering all managerial aspects of the flow of materials and information from source to customer, across the entire range of materials handling and movement functions, and throughout an organization and its supply channels. In tourism, these issues relate to the whole process of providing tourism services from sourcing of raw materials, products or different services to supply and distribution, and SCM performance can ultimately be measured by customer satisfaction. Thus, an important component of tourism SCM is the demand management. Therefore, this study aims to highlight the features of the concept of SCM and demand management in tourism, with an emphasis on a hotel chain in Romania, based on research and analysis of tourist traffic indicators as well as assessment of customers satisfaction. The sources of information are the internal company statistics, as well as various hotels booking websites that offer customers’ feedback. The results of the study provide a snapshot of how the hotel demand management can influence SCM performance in tourism.

  19. The influence of power in supply chain innovation; a case study of the Dutch wheat chain

    NARCIS (Netherlands)

    Pol, Hanneke; Visscher, Klaasjan

    2010-01-01

    The purpose of this article is to clarify the relation between the power structure of a supply chain and the possibilities to realize supply chain innovations. In an in-depth case study of the faltering start of an innovation trajectory in the Dutch wheat supply chain, we show that supply chain inno

  20. Supply chain management - safety aspects

    Directory of Open Access Journals (Sweden)

    2010-12-01

    Full Text Available Developing economy, growing customer requirements and competition make the service level higher. Delivery safety - as the highest priority - has to be maintained at the same time. Customers more and more often require transport to be very flexible, fast, and complex in terms of carrying every quantity of goods of different sizes, from and to different countries, through customs clearance, storing and distribution of shipments. Meeting these requirements depends on complex information on transport processes and their safety. The article presents safety foundations and institution Authorized Economic Operator - AEO in supply chains.

  1. TBA for the Toda chain

    Energy Technology Data Exchange (ETDEWEB)

    Kozlowski, K.K.; Teschner, J.

    2010-06-15

    We give a direct derivation of a proposal of Nekrasov-Shatashvili concerning the quantization conditions of the Toda chain. The quantization conditions are formulated in terms of solutions to a nonlinear integral equation similar to the ones coming from the thermodynamic Bethe ansatz. This is equivalent to extremizing a certain function called Yang's potential. It is shown that the Nekrasov-Shatashvili formulation of the quantization conditions follows from the solution theory of the Baxter equation, suggesting that this way of formulating the quantization conditions should indeed be applicable to large classes of quantized algebraically integrable models. (orig.)

  2. MODELING SUPPLY CHAIN WITH SIMULATION

    OpenAIRE

    János Benkõ

    2010-01-01

    Supply Chain Management faces a lot of challenging issues involving difficult decisions which can be company-oriented and customer-oriented issues. In this study we deal with customeroriented issues. For example, a customer’s demand may not be fully satisfied from stock on hand and the shortage may be backordered or the sale may be lost. Either way, it is desirable to balance the holding cost which depends on the magnitude of inventory against the cost of not fully satisfying customer demand....

  3. Heat transport in coupled inhomogeneous chains

    Institute of Scientific and Technical Information of China (English)

    Hu Tao; Bai Meng; Hu Ke; Tang Yi

    2011-01-01

    We first investigate the heat transport in a network model consisting of two coupled dimerized chains. Results indicate that the thermal resistance of each chain increases with the decrease of the mass ratio γ of the two types of atoms. Then, we find, when a light impurity or a heavy one is added in the two coupled homogeneous chains and coupled with a particle of another chain, the interface thermal resistances Rlint andRγint present different dependences on the mass ratio γ'. Finally, a persistent circulation of energy current is observed in coupled inhomogeneous chains with two pairs of interchain coupling.

  4. Integration of Forestry Industrial Chain in China

    Institute of Scientific and Technical Information of China (English)

    Zhanzhan; LAN; Liqun; WANG

    2013-01-01

    Based on the Smile Curve and Michael E. Porter’ value chain model,this paper points out that China’s forestry industry stays at the low end of the value chain for a long time. Raw materials are imported from foreign countries and also sold in foreign countries. Then,the authors analyze characteristics and existing problems of China’s forestry industrial chain. They put forward the development direction of China’s forestry industrial chain with reference to International Paper Company. Finally,they present their recommendations for integration of China’s forestry industrial chain.

  5. Uncertainty quantification for Markov chain models.

    Science.gov (United States)

    Meidani, Hadi; Ghanem, Roger

    2012-12-01

    Transition probabilities serve to parameterize Markov chains and control their evolution and associated decisions and controls. Uncertainties in these parameters can be associated with inherent fluctuations in the medium through which a chain evolves, or with insufficient data such that the inferential value of the chain is jeopardized. The behavior of Markov chains associated with such uncertainties is described using a probabilistic model for the transition matrices. The principle of maximum entropy is used to characterize the probability measure of the transition rates. The formalism is demonstrated on a Markov chain describing the spread of disease, and a number of quantities of interest, pertaining to different aspects of decision-making, are investigated.

  6. The fish industry - toward supply chain modelling

    DEFF Research Database (Denmark)

    Jensen, Toke Koldborg; Nielsen, Jette; Larsen, Erling

    2010-01-01

    Mathematical models for simulating and optimizing aspects of supply chains such as distribution, planning, and optimal handling of raw materials are widely used. However, modeling based on a holistic chain view including several or all supply chain agents is less studied, and food-related aspects...... such as quality and shelf-life issues enforce additional requirements onto the chains. In this article, we consider the supply chain structure of the fish industry. We discuss and illustrate the potential of using mathematical models to identify quality and value-adding activities. The article provides a first...... step toward innovative supply chain modeling aimed to identify benefits for all agents along chains in the fish industry....

  7. Sustainability Analysis for Gayo Coffee Supply Chain

    Directory of Open Access Journals (Sweden)

    Rachman Jaya

    2013-01-01

    Full Text Available Sustainable supply chain is a development of the conventional supply chains that discuses trade-off among economic, social and environmental dimensions in order to achieve better responsiveness in terms of quality, quantity and time-delivery in the supply chain structure. The objective of this research was to determine the Gayo coffee supply chain sustainability. The research was conducted at Bener Meriah and Aceh Tengah Districts, Aceh Province, Indonesia. Key actors in the supply chain considered were farmers, collectors, agro-industry and exporter. Sustainability dimensions considered in this research were the economic, social, environmental and material resources. The performance of each aspect was analyzed by using Multi-dimensional scaling and leverage analysis. The result of the research showed that the composite of Gayo coffee supply chain sustainability index was 33.53 which mean less sustainable level. Therefore it is recommended to reengineering the Gayo coffee supply chain by considering all of the four sustainability dimensions above.

  8. Determining an optimal supply chain strategy

    Directory of Open Access Journals (Sweden)

    Intaher M. Ambe

    2012-11-01

    Full Text Available In today’s business environment, many companies want to become efficient and flexible, but have struggled, in part, because they have not been able to formulate optimal supply chain strategies. Often this is as a result of insufficient knowledge about the costs involved in maintaining supply chains and the impact of the supply chain on their operations. Hence, these companies find it difficult to manufacture at a competitive cost and respond quickly and reliably to market demand. Mismatched strategies are the root cause of the problems that plague supply chains, and supply-chain strategies based on a one-size-fits-all strategy often fail. The purpose of this article is to suggest instruments to determine an optimal supply chain strategy. This article, which is conceptual in nature, provides a review of current supply chain strategies and suggests a framework for determining an optimal strategy.

  9. Research on Starting Techniques of High Power Multi-drive Belt Conveyor with Load-limiting Fluid Coupling%大功率多驱动限矩型液耦带式输送机起动技术研究

    Institute of Scientific and Technical Information of China (English)

    黄小军; 刘洪宝; 乔朝起

    2015-01-01

    Long-distance high power belt conveyor has been widely applied in the handling system of bulk cargo terminal. Most drive units of the belt conveyors are characterized with high power, multi-drive and load-limiting type of fluid coupling. With the development of high power multi-drive system, to ensure the stable starting of multi-drive belt conveyor and decrease its impact on the electric power network as much as possible, it’s necessary to program the starting sequence and time interval of motors. In the starting process, the electrical and mechanical setting and cooperation have been carried out to start the multi-drive belt conveyor stably and reliably.%长距离大能力带式输送机在散货港口系统中得到普遍应用,其驱动装置多采用大功率、多驱动、限矩型液耦的配置形式;随着大功率、多级驱动应用的增多,为保证多台电机驱动下皮带输送机能够平稳起动,并尽可能避免起动对电网冲击,合理规划各个驱动的起动顺序及间隔很有必要。本文阐述了多级驱动起动过程中机械、电气的设置和配合,从而实现多级驱动下稳定可靠安全地起动带式输送机。

  10. Configurational statistics of confined polymer chains

    Energy Technology Data Exchange (ETDEWEB)

    Lohse, David John

    1978-01-01

    The work on confined chain statistics is reviewed. The work on the general statistics is discussed first, and then some of the theories for the applications of statistics are considered. Two methods for determining the general statistics of a confined chain are discussed. The first is the method of images. The second method involves the use of differential equations. In a specific case the statistics of the unconfined chain are chosen to be defined by the Gaussian real chain distribution. The confinement is provided by two parallel walls. The distribution for the four possible types of chains, bridges (tie chains), loops, cilia (dangling chain ends), and floating (unattached) chains, are derived. These statistics are then applied to two polymer systems in which the confinement is due to internal surfaces, semicrystalline polymers and block copolymers. Both systems are modelled by chains between two walls for a number of morphologies. Mechanical properties are calculated for both systems and for block copolymers swelling is also considered. The main result of this work is that there are two effects which determine the behavior of the chains in these systems. The first is the effect of the confinement which operates on all the chains, since the mode of attachment is not important. The confinement reduces the number of configurations available to the chains. This effect is larger the closer the walls are, relative to the length and stiffness of the chains. The second effect operates only on bridges, since it requires that the ends of the chain be attached to different walls. This is the inherent elastic nature of the bridge, which means that the number of configurations is reduced when it is stretched beyond its equilibrium length. All the behavior calculated here can be explained by these two effects.

  11. MODELING A VALUE CHAIN IN PUBLIC SECTOR

    Directory of Open Access Journals (Sweden)

    Daiva Rapcevičienė

    2014-08-01

    Full Text Available Purpose – Over the past three decades comprehensive insights were made in order to design and manage the value chain. A lot of scholars discuss differences between private sector value chain – creation profit for the business and public sector value chain, the approach that public sector creates value through the services that it provides. However, there is a lack of a common understanding of what public sector value chain is in general. This paper reviews the literature on how the private value chain was transformed into public value chain and reviews a determination and architecture of a value chain in public sector which gives a structural approach to greater picture of how all structure works. It reviews an approach that the value chain for the public sector shows how the public sector organizes itself to ensure it is of value to the citizens. Design/methodology/approach – descriptive method, analysis of scientific literature. Findings – The public sector value chain is an adaptation of the private sector value chain. The difference between the two is that the customer is the focus of the public sector context, versus the profit focus in the private sector context. There are significant similarities between the two chain models. Each of the chain models are founded on a series of core components. For the public sector context, the core components are people, service and trust. Research limitations/implications – this paper based on presenting value chain for both private and public sectors and giving deeper knowledge for public sector value chain model. Practical implications – comprehension of general value chain model concept and public sector value chain model helps to see multiple connections throughout the entire process: from the beginning to the end. The paper presents the theoretical framework for further study of the value chain model for waste management creation. Originality/Value – The paper reveals the systematic

  12. GCD无齿轮传动在超大型主斜井带式输送机设计中的运用%Application of GCD gearless driving in the design of belt conveyor for very large main inclined draft

    Institute of Scientific and Technical Information of China (English)

    谢永刚

    2014-01-01

    阐述了中煤大海则煤矿主井带式输送机前期驱动系统方案的设计及选用论证,介绍了国外用于特大功率带式输送机驱动系统的传动方式———GCD无齿轮传动系统,该传动方式的设计理念将给传统带式输送机的传动方式的设计理念和思路给予一定启示。%The earlier design and selection of driving system for belt conveyor used in main draft of Dahaize Coal Mine of China National Coal Group Corporation were expounded�� GCD gearless driving system,used for ultrahigh power belt conveyor in abroad,was introduced��This kind of driving mode will bring a certain inspiration for the driving design of conventional belt conveyor.

  13. 不停机调节带式输送机托辊偏置角的方法%Method for Adjusting Bias Angle of Rollers when Belt Conveyor Running

    Institute of Scientific and Technical Information of China (English)

    王海斌; 李允旺; 白森; 贾正乾; 陈井刚

    2015-01-01

    Adjusting the bias angle of the roller of the belt conveyor is a common method to adjust the belt deviation. The paper introduces two method for adjusting the bias angle of the rollers when the belt conveyor running. The first method is using a longer shaft roller, the end of the extension shaft is lengthened. There is a longer part of the shaft outside the roller supporting, after the roller is installed on the supporting roller. The outer end of the roller shaft can be lifted and moved to other shaft slot, by hand and using other tools. The second method is using a roller frame which can adjusting the bias angle of the rollers. Second, adopt the bracket which has adjustable offset angle of the roller frame, and the roller frame outer end is provided with a slide deck which can regulate the position through screw, supporting roller shaft end clamping on the slider deck. By turning the screw to regulate the slide deck’s position, to realize the regulating of the supporting roller’s offset angle. That two methods are applied in the belt conveyor of Shanxi Lexus of Coal Industry Co. Ltd. and it is highly effective, safety, and offset regulating effect good when the supporting roller’s offset angle is adjusted.%调节托辊的偏置角是对带式输送机输送带调偏的一个常见方法,介绍了2种不停机调节托辊斜置角的方法。①使用轴端加长的托辊;该托辊一端的伸出轴被加长,安装在托辊架上后,托辊支撑座的外侧伸出一段较长的轴段。可徒手或借用工具将托辊外端抬起,并移至其他卡槽内;②采用可调托辊偏置角的托辊架,该托辊架外端设有可通过螺杆调节位置的滑块卡座,托辊轴的外端头卡装在滑块卡座上。通过转动螺杆调节滑块卡座位置,实现托辊偏置角的调节。这2种方法在山西凌志达煤业有限公司的多部带式输送机上得以应用,调整托辊偏置角时高效、安全,调偏效果良好。

  14. Light chain immunofluorescence in various nephropathies

    Directory of Open Access Journals (Sweden)

    Megha S Uppin

    2011-01-01

    Full Text Available Context: Light chain immunofluoresence (IF in renal biopsy is routinely used in the diagnosis of light chain deposition disease (LCDD, amyloidosis and cast nephropathy. Light chain predominance has also been reported in certain glomerulopathies like IgA nephropathy. However, pathogenesis of this pattern of deposition in various glomerulopathies is uncertain. Aim: To discuss the pathogenesis and utility of light chain IF in nephropathies. Setting and Design: Retrospective study. Materials and Methods: The pattern of light chain IF and light microscopic diagnosis in 306 cases of various nephropathies was reviewed. Direct IF was done in all these cases with commercial fluorescence (Fluoresciene Isothiocynate conjugated polyclonal rabbit anti-human antisera against IgM, IgG, IgA, C3, C1q, kappa and lambda light chains. Results: Light chain deposits were seen in 240 (78.43% cases. In IgA nephropathy, lupus nephritis and post-infectious glomerulonephritis (PIGN, lambda positivity was more as compared to kappa. Light chain deposits in LCDD and membranous nephropathy were more kappa type. The IF pattern in amyloidosis was not consistent. Conclusion: The pathogenesis of light chain predominance in glomerulopathies is not clear and it depends on isoelectric point and size of the immune complex. Light chain IF should be performed routinely in all the renal biopsies.

  15. Structure of polymer chains under confinement

    Indian Academy of Sciences (India)

    Jyotsana Lal

    2008-11-01

    We observe by SANS the structure of neutral polystyrene and charged polystyrene sulphonate chains in semi-dilute solutions confined in a model nanoporous glass, Vycor. The size of the free chains in solution is always larger than the pore diameter, 70. The use of a suitable mixture of hydrogenated and deuterated solvents and polymers enables us to measure directly the form factor of one single chain among the others. Single chain form factor was observed both for bulk and confined chains using the condition of zero average contrast. Our measurements on neutral polymer chains are in agreement with the theoretical predictions established by Daoud and de Gennes for chains confined in a cylindrical pore when the chains are entangled and laterally squeezed but remain ideal at large scale along the cylinder axis because of the screening of the excluded volume interactions (so-called regime of ``semi-dilute cigars"). For confined charged polymers, a peak is observed whose intensity increases with molecular weight and the asymptotic 1/ scattering region is extended compared to the bulk. We infer that the chains are sufficiently extended, under the influence of confinement, to highlight the large scale disordered structure of Vycor even under contrast matched conditions. The asymptotic behaviour of the observed interchain structure factor is ≈ 1/2 and ≈ 1/ for free and confined chains respectively.

  16. Phase behaviour of polyethylene knotted ring chains

    Institute of Scientific and Technical Information of China (English)

    Wen Xiao-Hui; Zhang Lin-Xi; Xia A-Gen; Chen Hong-Ping

    2011-01-01

    The phase behaviour of polyethylene knotted ring chains is investigated by using molecular dynamics simulations.In this paper, we focus on the collapse of the polyethylene knotted ring chain, and also present the results of linear and ring chains for comparison. At high temperatures, a fully extensive knot structure is observed. The mean-square radius of gyration per bond〈S2〉/(Nb2)and the shape factor(δ*)depend on not only the chain length but also the knot type.With temperature decreasing, chain collapse is observed, and the collapse temperature decreases with the chain length increasing. The actual collapse transition can be determined by the specific heat capacity Cv, and the knotted ring chain undergoes gas-liquid-solid-like transition directly. The phase transition of a knotted ring chain is only one-stage collapse, which is different from the polyethylene linear and ring chains. This investigation can provide some insights into the statistical properties of knotted polymer chains.

  17. A possible chain of motivation

    Directory of Open Access Journals (Sweden)

    Rodica Ianole

    2007-12-01

    Full Text Available On a world-wide basis there is a growing concern about organization' s capability to retain their top talents. In the specific case of a student's organization . Team Work - we confront with the same problems: how to inspire our members to act in the spirit of the values we share: professionalism, team work and voluntariate, and how to determine them to remain part of the system. This is where motivation appears like one of those terms that can mean very different things depending on exactly where you sit. The aim of the present paper is to draw a schematic picture of how it can work a chain of motivation in Team Work and other similar organizations.

  18. The stylohyoid chain: CT imaging

    Energy Technology Data Exchange (ETDEWEB)

    Uysal Ramadan, Selma, E-mail: uysalselma@yahoo.co [Department of Radiology, Ankara Training and Research Hospital, Ankara 06590 (Turkey); Goekharman, Dilek, E-mail: gokharman@ttnet.net.t [Department of Radiology, Ankara Training and Research Hospital, Ankara 06590 (Turkey); Kosar, Pinar, E-mail: pkosar@hotmail.co [Department of Radiology, Ankara Training and Research Hospital, Ankara 06590 (Turkey); Kacar, Mahmut, E-mail: mkacar1961@gamil.co [Department of Radiology, Ankara Training and Research Hospital, Ankara 06590 (Turkey); Kosar, Ugur, E-mail: ugurkosar@hotmail.co [Department of Radiology, Ankara Training and Research Hospital, Ankara 06590 (Turkey)

    2010-09-15

    We aimed in this report to discuss the embryology, anatomy, theories of ossification and symptoms, clinical presentation, and diagnosis of the stylohyoid chain (SHC) variations, together with the role of radiographs, computed tomography (CT) and three-dimensional (3D)-CT in showing these variations. Because CT/3D-CT additionally facilitates visualization of the entire SHC with different axes, it is the most valuable method for establishing the relationship between the SHC and the surrounding tissue. SHC variation can be discovered during CT performed for indications other than ossified SHC. It is important to diagnose whether or not the SHC is ossified, since one of the treatment procedures in ossified SHC is total excision. If the clinician and radiologist are aware of these variations observed in the SHC, patients with vague symptoms may be spared unnecessary investigations and may be properly diagnosed earlier.

  19. Worldline as a Spin Chain

    CERN Document Server

    Fatollahi, Amir H

    2016-01-01

    The general theoretical ground for the models based on the compact angle coordinates is presented. It is observed that the proper dependence on compact coordinates has to be through the group elements and is achieved most naturally in a discrete-time formulation of the theory. By the construction, the discrete worldline inlaid by compact coordinates resembles the spin chains of magnetic systems. As examples, the models based on the groups U(1), $\\mathbb{Z}_N$ and SU(2) are explicitly constructed and their exact energy spectra are obtained. As the consequence of minima in the spectra, the models exhibit a phase transition of first-order. The dynamics by U(1) group is attempted to be fitted to the proposed role for monopoles in the dual Meissner effect of confinement mechanism.

  20. Revisiting Causality in Markov Chains

    CERN Document Server

    Shojaee, Abbas

    2016-01-01

    Identifying causal relationships is a key premise of scientific research. The growth of observational data in different disciplines along with the availability of machine learning methods offers the possibility of using an empirical approach to identifying potential causal relationships, to deepen our understandings of causal behavior and to build theories accordingly. Conventional methods of causality inference from observational data require a considerable length of time series data to capture cause-effect relationship. We find that potential causal relationships can be inferred from the composition of one step transition rates to and from an event. Also known as Markov chain, one step transition rates are a commonly available resource in different scientific disciplines. Here we introduce a simple, effective and computationally efficient method that we termed 'Causality Inference using Composition of Transitions CICT' to reveal causal structure with high accuracy. We characterize the differences in causes,...

  1. Spin chains and string theory.

    Science.gov (United States)

    Kruczenski, Martin

    2004-10-15

    Recently, an important test of the anti de Sitter/conformal field theory correspondence has been done using rotating strings with two angular momenta. We show that such a test can be described more generally as the agreement between two actions: one a low energy description of a spin chain appearing in the field theory side, and the other a limit of the string action in AdS5xS5. This gives a map between the mean value of the spin in the boundary theory and the position of the string in the bulk, and shows how a string action can emerge from a gauge theory in the large-N limit.

  2. Flow field simulation and structure optimization of confined hood at transshipment point of coal conveyor belt%输煤皮带转载点密闭罩流场模拟与结构优化

    Institute of Scientific and Technical Information of China (English)

    吕太; 车晟; 郭澄昆; 王旭东

    2013-01-01

    To study the effect of flow field on the dust absorption performance in a confined hood,numerical simulation of the gas-solid two-phase flow in a confined hood used in transshipment point of coal conveyor belt was carried out with Fluent.The analysis of gas flow field and distribution of coal dust concentration indicates that,with a larger flow deflection at chute turning point,the coal dust concentration will increase and the local coal dust accumulates more correspondingly.In addition,the analysis reveals that placket angle of the dust exhaust hood also had important influence on the dust absorption performance.In order to divert the gas flow as well as enhancing the effect of dust absorption,some optimization designs about the structure of chute turning point and the dust exhaust hood were devised.The result shows that,gas flow field and distribution of coal dust become more uniform and the dust absorption performance is improved after the optimization.Therefore,the present study provides some guidance for the optimization design of confined hood at the transshipment point of coal conveyor belt.%为了研究输煤皮带转载点密闭罩内流场对吸尘效果的影响,采用Fluent软件对某转载点密闭罩内气固两相流动情况进行了数值模拟.通过气流分布和煤尘浓度分布的分析,发现溜槽转折处较大的气流偏转会增加煤尘起尘量和导致局部煤尘积聚,吸尘罩的开口角度对吸尘效果也有较大影响.为了疏导气流并加强吸尘效果,提出了溜槽转折处和吸尘罩的结构优化设计方案.研究表明,改进后气流分布更加均匀,吸尘效果有所提高,从而为转载点密闭罩的优化设计提供了参考.

  3. TPU输送带用憎油涂层的制备及性能研究%Research on the Preparation and Properties of Oleophobic Coating Used for TPU Conveyor Belt

    Institute of Scientific and Technical Information of China (English)

    刘琳; 符春阳; 林文庆

    2011-01-01

    -NCO封端PU与丙烯酸羟基酯反应制得的PUA可UV固化.研究表明,热塑性聚氨酯弹性体输送带表面涂覆后从亲油变为憎油.当异福乐酮二异氰酸酯与聚四氢呋喃投料比为6:1(物质的量)、涂层干膜厚0.11mm、光固化90s时,甲基丙烯酸羟丙脂合成PUA的水接触角(或憎油角)达51.9°,丙烯酸羟丙酯合成PUA在TPU表面剥离强度达132.5N/m,交联剂用量为10%(质量分数,下同)时,涂层附着力为1级.%Polyurethane acrylate(PUA) prepared by the reaction between isocyanate-terminated polyurethane and acrylic hydroxyl resin can be covered on the surface of TPU conveyor by the way of UV curing. The coating obtained by this method behaves hydrophilic on its surface and excellent adhesion. Experiments show that the surface of the conveyor belt can be changed into oleophobic from pro-oil after covered, when IPDI and PTMG are added as the ratio of 6 : 1, the coating's dry-film-thickness is about 0. llmm, the UV curing time is 90s, HPMA is used in the synthesis, PUA has the best oleophobic property, its water contact angle(or called oleophobic angle) can reach up to 51.9°; PUA has the best peel strength when hydroxylpropyl acrylate is used in the synthesis, its 180° peel strength of this kind can reach up to 132. 5N/m, when the cross-linker HDDA added is 10wt%, the coating has the best adhesion, its the adhesion on tins can reach up to first class.

  4. The Evolutionary Dynamics of Biofuel Value Chains

    DEFF Research Database (Denmark)

    Ponte, Stefano

    2014-01-01

    In this paper I propose to push the frontier of global value chain (GVC) governance analysis through the concept of ‘polarity’. Much of the existing GVC literature has focused on ‘unipolar’ value chains, where one group of ‘lead firms’ inhabiting a specific function in a chain plays a dominant role...... and multipolarity. Empirically, I do so by examining the evolutionary dynamics of governance in biofuel value chains, with specific focus on the key regulatory and institutional features that facilitated their emergence and expansion. First, I examine the formation, evolution, and governance of three national....../regional value chains (in Brazil, the US, and the EU); then, I provide evidence to support a trend towards the increasing but still partial formation of a global biofuel value chain and examine its governance traits....

  5. Kinetic Chain Rehabilitation: A Theoretical Framework

    Directory of Open Access Journals (Sweden)

    Aaron Sciascia

    2012-01-01

    Full Text Available Sequenced physiologic muscle activations in the upper and lower extremity result in an integrated biomechanical task. This sequencing is known as the kinetic chain, and, in upper extremity dominant tasks, the energy development and output follows a proximal to distal sequencing. Impairment of one or more kinetic chain links can create dysfunctional biomechanical output leading to pain and/or injury. When deficits exist in the preceding links, they can negatively affect the shoulder. Rehabilitation of shoulder injuries should involve evaluation for and restoration of all kinetic chain deficits that may hinder kinetic chain function. Rehabilitation programs focused on eliminating kinetic chain deficits, and soreness should follow a proximal to distal rationale where lower extremity impairments are addressed in addition to the upper extremity impairments. A logical progression focusing on flexibility, strength, proprioception, and endurance with kinetic chain influence is recommended.

  6. Kinetic chain rehabilitation: a theoretical framework.

    Science.gov (United States)

    Sciascia, Aaron; Cromwell, Robin

    2012-01-01

    Sequenced physiologic muscle activations in the upper and lower extremity result in an integrated biomechanical task. This sequencing is known as the kinetic chain, and, in upper extremity dominant tasks, the energy development and output follows a proximal to distal sequencing. Impairment of one or more kinetic chain links can create dysfunctional biomechanical output leading to pain and/or injury. When deficits exist in the preceding links, they can negatively affect the shoulder. Rehabilitation of shoulder injuries should involve evaluation for and restoration of all kinetic chain deficits that may hinder kinetic chain function. Rehabilitation programs focused on eliminating kinetic chain deficits, and soreness should follow a proximal to distal rationale where lower extremity impairments are addressed in addition to the upper extremity impairments. A logical progression focusing on flexibility, strength, proprioception, and endurance with kinetic chain influence is recommended.

  7. Position Paper on Intelligent Supply Chains

    DEFF Research Database (Denmark)

    Møller, Charles

    the concept of Intelligent Supply Chain and to establish an overall perspective based on information management. The claim made here is that the notion of the intelligent enterprise contributes with a new perspective on supply chain management that addresses the current challenges in an industrial supply...... chain. The argument is further that the existing information systems embodied in the standard enterprise information systems (EIS) have an important role in driving the development of modern supply chains though business processes. This is warranted by an analysis of the role of EIS on the development...... of intelligent supply chains. It is concluded that information management is critical to intelligent supply chains and a research agenda is outlined....

  8. The effect of chain flexibility and chain mobility on radiation crosslinking of polymers

    Energy Technology Data Exchange (ETDEWEB)

    Jia Zhen, Sun

    2001-07-01

    Radiation crosslinking of polymers mainly depends on the structure of polymer chain. The flexibility and mobility of chain directly influence the possibility of the reactive radicals recombination. Flexible chain is easier to crosslink than rigid-chain polymer. The latter must be crosslinked at high temperature, as most polymers can only crosslink above their melting point. Structural effect also influences the mechanism of radiation crosslinking of polymers. We find from the results in literature and in our laboratory that, the flexibility chain polymer mainly crosslinked with H type, but the rigid chain polymer mainly crosslinked with Y type. (author)

  9. The effect of chain flexibility and chain mobility on radiation crosslinking of polymers

    Science.gov (United States)

    Jia Zhen, Sun

    2001-01-01

    Radiation crosslinking of polymers mainly depends on the structure of polymer chain. The flexibility and mobility of chain directly influence the possibility of the reactive radicals recombination. Flexible chain is easier to crosslink than rigid-chain polymer. The latter must be crosslinked at high temperature, as most polymers can only crosslink above their melting point. Structural effect also influences the mechanism of radiation crosslinking of polymers. We find from the results in literature and in our laboratory that, the flexibility chain polymer mainly crosslinked with H type, but the rigid chain polymer mainly crosslinked with Y type.

  10. The role of enterprise systems in supply chain networks: a taxonomy of supply chain strategies

    DEFF Research Database (Denmark)

    Møller, Charles

    2006-01-01

    in the supply chain and to choose the right supply chain strategy. The work is based on a comprehensive study of the Supply Chain Management (SCM) and Enterprise Resource Planning (ERP) literature and the study suggests that there is an emerging new research potential for Enterprise Systems (ES) in the supply......This paper proposes a taxonomy for supply chain integration strategies. The taxonomy is based on the contingencies of supply chain network coupling and the Extended Enterprise Systems (EES) architecture in the supply chain. The purpose of this model is to map the portfolio of relations...

  11. Strategy to Enhance International Supply Chain Security

    Science.gov (United States)

    2007-07-01

    a strategic plan to enhance the security of the international supply chain , including protocols for the expeditious resumption of the flow of trade...following a transportation disruption or transportation security incident. The Strategy to Enhance International Supply Chain Security exists within a...extensive risk analysis specific to the risk area they cover in the supply chain . Assessments are used to identify the highest risk areas and resources

  12. Evaluating Reverse Supply Chain Efficiency: Manufacturer's Perspective

    DEFF Research Database (Denmark)

    Kumar, M.; Tiwari, M. K.; Wong, K. Y.

    2014-01-01

    The paper aims to illustrate the use of fuzzy data envelopment analysis (DEA) in analyzing reverse supply chain (RSC) performance from the manufacturer's perspective. By using an alternative alpha-cut approach, the fuzzy DEA model was converted into a crisp linear programming problem, thereby...... usually ensures an environmentally friendly supply chain network, companies which have implemented RSC techniques since a longer duration do not necessarily have a more efficient supply chain in general....

  13. Supply Chain Performance Evaluation: Trends and Challenges

    OpenAIRE

    Ezutah U. Olugu; Kuan Y. Wong

    2009-01-01

    Problem statement: In todays manufacturing world, globalization policies and rejuvenation have created a more intensive competition amongst manufacturers. On the other hand, manufacturers have turned to the option of adopting innovative technologies, process re-engineering and strategies such as efficient supply chain management to achieve a sustainable competitive advantage. Effective supply chain performance measurement has been identified as a key issue towards efficient supply chain manag...

  14. PRINCIPLES OF THE SUPPLY CHAIN PERFORMANCE MEASUREMENT

    OpenAIRE

    BEATA ŒLUSARCZYK; SEBASTIAN KOT

    2012-01-01

    Measurement of performance in every business management is a crucial activity allowing for effectiveness increase. The lack of suitable performance measurement is especially noticed in complex systems as supply chains. Responsible persons cannot manage effectively without suitable set of measures those are base for comparison to previous data or effects of other supply chain functioning. The analysis shows that it is very hard to find balanced set of supply chain performance measures those sh...

  15. Finding gold in the supply chain.

    Science.gov (United States)

    Caudle, Allen

    2009-12-01

    To optimize supply chain performance and achieve savings that enhance the bottom line, hospitals should: Generate purchase orders for every item purchased. Ensure the organization is protected from undue vendor influence. Keep track of where supply chain dollars are going. Review contracts regularly to ensure competitiveness. Have a contract for each product category. Buy only what the organization is sure to use. Get rid of excess inventory. Develop a strategic plan for continued supply chain savings.

  16. Toc Approach for Supply Chain Performance Enhancement

    OpenAIRE

    Brijesh Ainapur; Ritesh Singh; P.R.Vittal

    2011-01-01

    Many foundries are operating at lower levels than the installed capacities. Study of 56 foundries acrossIndia has shown that only 68% of installed capacities are being utilized. This is mainly because of lack ofco-ordination among the supply chain partners. This study is an effort in identifying these gaps using TOCapproach which will help in supply chain performance enhancement.Field of Supply Chain Management witnessed rapid growth in recent past and proved to be a successfultool for organi...

  17. Supply chain integration:challenges and solutions

    OpenAIRE

    Sweeney, Edward

    2011-01-01

    Since its introduction by management consultants in the early 1980s, supply chain management (SCM) has been primarily concerned with the integration of processes and activities both within and between organisations. The concept of supply chain integration (SCI) is based on documented evidence that suggests that much of the waste throughout businesses is a consequence of fragmented supply chain configurations. However, there is also evidence to suggest that the achievement of higher levels of ...

  18. Parallel Computing Properties of Tail Copolymer Chain

    Directory of Open Access Journals (Sweden)

    Hong Li

    2013-08-01

    Full Text Available The properties of a AB diblock copolymer chain are calculated by Monte Carlo methods. Monomer A contacting to the surface has an adsorption energy E=-1 and monomer B E= 0. The polymer chain is simulated by self-avoiding walk in simple cubic lattice. The adsorption properties and the conformation properties of the polymer chain are computed by using message passing interface (MPI. The speedup is close to linear speedup by parallel computing independent samples.    

  19. Collaborative Planning in Modern Supply Chain

    OpenAIRE

    Nýdlová, Olga

    2009-01-01

    This master thesis describes and proves how companies can improve their operational performance and supplier relationships by using modern collaborative and planning practices, specifically the Collaborative Planning Forecasting and Replenishment (CPFR) concept. The theoretical part depicts main developments in supply chain planning over time, shows common challenges in the world of supply chain and offers possible solutions in terms of collaborative supply chain planning practices. The pract...

  20. Responsive supply chain: modeling and simulation

    Directory of Open Access Journals (Sweden)

    Amit Kumar Sinha

    2015-06-01

    Full Text Available Unexpected occurrence like natural calamity, abruptly change in customer demands, upgradation of technologies, necessity of compatible suppliers etc. is the most challenging issues even for efficient global supply chain management. Therefore, modeling of responsive supply chain is an emerging technology for sustaining any firm/industry in future competitive environment. In this paper, an attempt has been made to not only analyze the performance of efficient supply chain management but also how to improve the performance of existing supply chain with the objective of developing a modeling of responsive supply chain management. The complexity of the model is also highlighted with the help of numerical example. This paper also explores the possibility to mathematical modeling of the responsive supply chain which will be an emerging topic for researchers and practitioners. The modeling of responsive supply chain can be employed as a competitive strategy for e-commerce, green supply chain, and compatible supplier selection problem. The another salient feature of this paper is that a distinct comparative literature review of the lean, agile, efficient, and responsive supply chain management has been presented.

  1. Towards traceability in cocoa - chocolate supply chain

    OpenAIRE

    Syahruddin, Normansyah

    2011-01-01

    The multi – events of food alerts and food risks which occurred in a lengthy period and various locations, grows concern of consumers to question the safety of the food that they consumed. For food producers, occurrences of food alert forced them to review their supply chain to identify what went wrong in their supply chain. To do this, they need a good traceability system that capable in revealing the problems occurred along the chains. In general, a typical food supply chain is consists of ...

  2. Metastability of exponentially perturbed Markov chains

    Institute of Scientific and Technical Information of China (English)

    陈大岳; 冯建峰; 钱敏平

    1996-01-01

    A family of irreducible Markov chains on a finite state space is considered as an exponential perturbation of a reducible Markov chain. This is a generalization of the Freidlin-Wentzell theory, motivated by studies of stochastic Ising models, neural network and simulated annealing. It is shown that the metastability is a universal feature for this wide class of Markov chains. The metastable states are simply those recurrent states of the reducible Markov chain. Higher level attractors, related attractive basins and their pyramidal structure are analysed. The logarithmic asymptotics of the hitting time of various sets are estimated. The hitting time over its mean converges in law to the unit exponential distribution.

  3. Electronic properties of aperiodic quantum dot chains

    Science.gov (United States)

    Korotaev, P. Yu.; Vekilov, Yu. Kh.; Kaputkina, N. E.

    2012-04-01

    The electronic spectral and transport properties of aperiodic quantum dot chains are investigated. The systems with singular continuous energy spectrum are considered: Thue-Morse chain, double-periodic chain, Rudin-Shapiro chain. The influence of electronic energy in quantum dot on the spectral properties, band structure, density of states and spectral resistivity, is discussed. Low resistivity regions correspond to delocalized states and these states could be current states. Also we discuss the magnetic field application as the way to tune electronic energy in quantum dot and to obtain metallic or insulating conducting states of the systems.

  4. Tests for intact and collapsed magnetofossil chains

    Science.gov (United States)

    Egli, R.

    2012-04-01

    In recent years, new techniques for the detection of magnetofossils have been proposed, based on their unique first-order reversal curves (FORC) and ferromagnetic resonance (FMR) signatures. These signatures are related to the non-interacting (FORC) and strongly uniaxial anisotropy (FMR) of isolated chains of magnetic particles. However, little is known about the fate of these signatures in sediments where magnetosome chains collapsed during early diagenetic processes. Due to the impossibility of observing the particle arrangement in-situ, the structure of collapsed chains can only be inferred from TEM images of magnetic extracts and from first-principles consideration on the mechanical stability of magnetosome chains once the biological material around them is dissolved. The magnetic properties of double chains, produced by some strains of cocci, are also not known. According to these considerations, four main magnetofossil structures were taken into consideration: (1) isolated, linear chains, (2) double, half-staggered chains, where the gaps of one chain face the magnetosomes in the other chain, (3) double chains with side-to-side magnetosomes, which might result from a "jackknife" type of collapse of a single, long chain, and (4) zig-zag collapsed chains of elongated crystals, where the magnetosome long axes are perpendicular to the chain axis. The collapsed structures might be relevant in sediments where magnetofossils carry a significant part of the remanent magnetization, because chain collapse tends to cancel the original natural remanent magnetization. Detailed models for the hysteretic and anhysteretic properties of structures (1-4) have been calculated by taking realistic distributions of magnetosome size, elongation, and spacing into account, as inferred from a number of published TEM observations. Model calculations took a total of >2 years continuous running time on two computers in an effort to obtain realistic results, which are shown here for the

  5. Lymphoplasmacytic lymphoma causing light chain cast nephropathy.

    Science.gov (United States)

    Pérez, Nuria S; Garcia-Herrera, Adriana; Rosiñol, Laura; Palos, Lily; Santiago, Evelyn; Espinosa, Gerard; Solé, Manel; Campistol, Josep M; Quintana, Luis F

    2012-01-01

    Plasma cell dyscrasias are frequently associated with kidney disease through the production of monoclonal immunoglobulin but with a diverse set of pathologic renal patterns. While almost all patients with a renal biopsy showing a cast nephropathy have myeloma, kidney involvement associated with pathological immunoglobulin light chains and lymphoma is rare. To our knowledge, this is the first report of a cast nephropathy associated with lymphoplasmacytic lymphoma. We emphasize the relation between light chain deposition and renal dysfunction in this disease with production of light chains. A therapeutic approach that decreases light chain production appears to be warranted in these patients.

  6. Molecular Wring Resonances in Chain Molecules

    DEFF Research Database (Denmark)

    Bohr, Henrik; Brunak, Søren; Bohr, Jakob

    1997-01-01

    It is shown that the eigenfrequency of collective twist excitations in chain molecules can be in the megahertz and gigahertz range. Accordingly, resonance states can be obtained at specific frequencies, and phenomena that involve structural properties can take place. Chain molecules can alter...... their conformation and their ability to function, and a breaking of the chain can result. It is suggested that this phenomenon forms the basis for effects caused by the interaction of microwaves and biomolecules, e.g. microwave assisted hydrolysis of chain molecules....

  7. Effects of enterprise technology on supply chain collaboration: analysis of China-linked supply chain

    Science.gov (United States)

    Li, Ling

    2012-02-01

    Supply chain collaboration has received increasing attention from scholars and practitioners in recent years. However, our understanding of how enterprise information technology facilitates supply chain collaboration is still very limited, especially with regard to Chinese enterprise ownerships such as state-owned firms, joint-venture firms and local village-owned firms. This paper extends the theory established in enterprise information technology (IT) and supply chain collaboration literature and relates it with coordination in China-linked supply chain. Drawing upon an empirical study from 177 Chinese companies, we provide three major findings: (i) uncovered the importance of leveraging enterprise IT through supply chain collaboration; (ii) identified the relationship between enterprise ownership and enterprise technology use and supply chain collaboration in China-linked supply chain and (iii) illustrated effects of supply chain collaborative activities on operational and market performance.

  8. An online algorithm for generating fractal hash chains applied to digital chains of custody

    CERN Document Server

    Bradford, Phillip G

    2007-01-01

    This paper gives an online algorithm for generating Jakobsson's fractal hash chains. Our new algorithm compliments Jakobsson's fractal hash chain algorithm for preimage traversal since his algorithm assumes the entire hash chain is precomputed and a particular list of Ceiling(log n) hash elements or pebbles are saved. Our online algorithm for hash chain traversal incrementally generates a hash chain of n hash elements without knowledge of n before it starts. For any n, our algorithm stores only the Ceiling(log n) pebbles which are precisely the inputs for Jakobsson's amortized hash chain preimage traversal algorithm. This compact representation is useful to generate, traverse, and store a number of large digital hash chains on a small and constrained device. We also give an application using both Jakobsson's and our new algorithm applied to digital chains of custody for validating dynamically changing forensics data.

  9. Study on self-adaptive control system of tandem-disked continuous conveyors%串联盘式输送机自适应控制系统的研究

    Institute of Scientific and Technical Information of China (English)

    刘尚启; 付晓东

    2011-01-01

    In view of many uncertainties and variation of parameters with time during the operation of the tandem-disked continuous conveyor, the method of analyzing the discrete control system and the system identification principle are used to sample and process the input and output data of the experimental prototype. The least square method is used to estimate the parameters, and the parametric model in a certain state is obtained. The simulation results show that the least square method can offer good estimation for the model parameters.%针对串联盘式输送机运行过程中的许多不确定因素和参数时变的特点,采用离散控制系统的分析方法和系统辨识原理,对试验样机的输入输出数据进行采样处理,用最小二乘法的一次完成算法进行参数估计,得到系统某一状态的参数模型.仿真结果显示,最小二乘法能够给出系统模型参数的良好估计.

  10. Simulated Analysis on Dynamic Characteristics of ZS60600F Cooling Conveyor Shake Sifter Based on ADAMS%基于ADAMS的ZS60600F型冷却输送振动筛动态特性仿真分析

    Institute of Scientific and Technical Information of China (English)

    李吉伟; 陈秀娟; 崔继强

    2011-01-01

    针对消失模铸造用ZS60600F型冷却输送振动筛,运用系统仿真软件ADAMS,建立振动筛虚拟样机模型.通过分析振动筛力学模型,在ADAMS/Vibration模块建立与实际等价的振动分析模型,对虚拟样机进行振动分析,得出振动筛系统动态特性,为振动筛动态设计提供必要的基础数据.%Using system simulation software ADAMS, the virtual prototype model of ZS60600F cooling conveyor shake sifter for EPC process was created. By analyzing the mechanical model of the shaker, the equivalent vibration analysis model with actual model in ADAMS / Vibration module was established. The vibration analysis to the virtual prototype model was performed, and the dynamic characteristics of the shaker were obtained, which provide the necessary basic data for dynamic design of shaking sifter.

  11. 基于离散元法的水平螺旋输送机仿真模拟与分析%Simulation and Analysis of the horizontal screw conveyor Based on the Discrete Element Method

    Institute of Scientific and Technical Information of China (English)

    于瑞江; 汤晓华; 张玉玲

    2015-01-01

    Based on the discrete element method, using Inventor to establish a three dimensional model of horizontal screw conveyer, to import the model into EDEM software simulation. It was gained by analyzing that when the rotational speed of the screw conveyer and the volumetric fill level was 200 rpm and 20% respectively, transporting a certain mass material consumed power was to minimize; Through simulation obtain the average speed change rule of rice grain and the force situation of screw conveyor, when the volumetric fill level is 20%, 50%, 70%.%基于离散元法,应用Inventor软件建立水平螺旋输送机三维实体模型,将该模型导入EDEM软件进行仿真模拟。分析验证了水平螺旋输送机转速和填充率分别为200r/min和20%时,螺旋输送机输送一定质量物料消耗的功率最小;通过仿真模拟得出填充率为20%、50%、70%时大米颗粒平均速度变化规律以及螺旋输送机受力情况。

  12. Fatigue Analysis of the Screw Conveyor Shaft Based on S-N Curve%基于S-N曲线的螺旋输送机主轴疲劳分析

    Institute of Scientific and Technical Information of China (English)

    李大平; 薛静; 刘学; 陈亮

    2014-01-01

    For the rear-driving screw conveyor of the shield machine,the finite element method followed by classic S-N curve is used to perform the fatigue life analysis of its shaft.With the help of the analysis,we can easily design the opti-mized structure to make sure that the screw works safely and efficiently during the whole construction process.%针对后部驱动结构形式的盾构螺旋输送机,采用先进的有限元分析再基于S-N曲线的方法,对其主轴进行疲劳寿命分析,并将此分析结果作为对主轴进行优化设计的依据,确保螺旋输送机在整个施工过程中能够正常高效工作。

  13. Experimental Study the Conveying Capability of Screw Conveyor Affected by Rotation Speed and Feeding Amount%螺旋输送装置转速和喂入量对输送性能的影响试验研究

    Institute of Scientific and Technical Information of China (English)

    乌兰图雅; 王春光; 赵圆圆; 王金莲

    2015-01-01

    This dissertation applies the experimental study to studying the performance of conveying affected by feeding a-mount and screw speed.The higher screw rotational speed, the greater power consumption.But the throughput increases with infinite speed, and the speed of 102 r/min when reach maximum throughput.The greater feeding amount, the grea-ter throughput,and greater the power consumption of conveyor Therefore should chose the reasonable rotation speed and feeding amount that can meet the production requirements in practical application.%通过试验,研究喂入量和螺旋转速对输送量和功耗的影响。试验结果表明:螺旋转速越高、输送装置的功耗越大,但输送量不随转速无限增大,当转速达到102 r/min 时输送量达到最大值;喂入量越大,输送量越大,输送装置的功耗也随之增加。因此,在实际应用中能满足生产需求的情况下,转速和喂入量不宜过高。

  14. Design of a Disk Brake for Belt Conveyor Hydraulic Control System Design%一种带式输送机盘式制动器液压控制系统的设计

    Institute of Scientific and Technical Information of China (English)

    曹秀洪

    2013-01-01

      文中基于盘式制动器设计了一个液压控制系统,该系统的设计是针对带式运输机在运输过程中的控制问题设计的,所以它的稳定性能和反映能力都占有绝对的优势。文中简单的介绍了液压系统遇到松闸过程、保压过程、正常停车、超速制动、紧急制动和系统突然断电等情况时的运行状况。%  Based on the design of disk brake on a hydraulic control system, the system design is for the belt conveyor in the transportation process control design, so its stability properties and screening ability has the absolute advantage. This paper introduces the hydraulic system of brake loosing process, encountered pressure, normal parking, overspeed braking, emergency braking and system failure, when the running state airport.

  15. 带式输送机新型驱动系统的开发与研究%Development and Research of a New-type Belt Conveyor Driving System

    Institute of Scientific and Technical Information of China (English)

    刘金丽

    2015-01-01

    Taking the new permanent magnetic drive system as the study object ,this paper introduced the characteristics of permanent magnet system. Then according to the use of permanent magnet driving system feedback situation ,we described in detail the measures to improve the shortcomings ,and used ANASY software to analyze the permanent magnet motor calculation. The simulation results showed that the new drive system for belt conveyor in the mine has the advantages of high efficiency,energy saving,high starting torque,low noise,maintenance free,smooth running characteristics.%以新型永磁驱动系统为研究对象,介绍了永磁系统的特点,然后针对永磁驱动系统的使用反馈情况,详细地阐述了不足之处的改进措施,并采用ANASY软件对永磁电机进行了分析计算。通过改进得知,新型驱动系统用在矿井带式输送机上具有高效、节能、起动转矩大、免维护、低噪声、运行平稳等特点。

  16. Supply Chain Systems Architecture and Engineering Design: Green-field Supply Chain Integration

    OpenAIRE

    Radanliev, Petar

    2015-01-01

    This paper developed a new theory for supply chain architecture, and engineering design that enables integration of the business and supply chain strategies. The architecture starts with individual supply chain participants and derives insights into the complex and abstract concept of green-field integration design. The paper presented a conceptual system for depicting the interactions between business and supply chain strategy engineering. The system examines the decisions made when engineer...

  17. Geometry behind chordal Loewner chains

    CERN Document Server

    Contreras, Manuel D; Gumenyuk, Pavel

    2010-01-01

    Loewner Theory is a deep technique in Complex Analysis affording a basis for many further important developments such as the proof of famous Bieberbach's conjecture and well-celebrated Schramm's Stochastic Loewner Evolution (SLE). It provides analytic description of expanding domains dynamics in the plane. Two cases have been developed in the classical theory, namely the {\\it radial} and the {\\it chordal} Loewner evolutions, referring to the associated families of holomorphic self-mappings being normalized at an internal or boundary point of the reference domain, respectively. Recently there has been introduced a new approach [arXiv:0807.1594v1, arXiv:0807.1715v1, arXiv:0902.3116v1] bringing together, and containing as quite special cases, radial and chordal variants of Loewner Theory. In the framework of this approach we address the question what kind of systems of simply connected domains can be described by means of Loewner chains of chordal type. As an answer to this question we establish a necessary and ...

  18. Jetfighter: An Experiential Value Chain Exercise

    Science.gov (United States)

    Sheehan, Norman T.; Gamble, Edward N.

    2010-01-01

    Value chain analysis is widely taught in business schools and applied by practitioners to improve business performance. Despite its ubiquity, many students struggle to understand and apply value chain concepts in practice. JetFighter uses a complex manufacturing process (making intricate paper planes) to provide students an opportunity to enhance…

  19. The Future of Resilient Supply Chains

    DEFF Research Database (Denmark)

    Donadoni, Mattia; Roden, Sinéad; Scholten, Kirstin

    This research aims to advance theoretical understanding around the management of supply chain disruptions through a multi-stage Delphi study on supply chain resilience. Stage one focused on polling academic experts followed by a second stage with practitioners from automotive, electronics and food...

  20. Achieving Supply Chain Integration within Construction Industry

    Directory of Open Access Journals (Sweden)

    Peter McDermotti

    2012-11-01

    Full Text Available The main driver behind the adoption of supply chain management (SCM philosophy into the construction industry was the successes within other industry sectors. SCM can be defined as network of different organisations, linked upstream and downstream in a chain, aiming to produce quality and value in the services and products for the end consumers through integrated processes and activities. In order to achieve the optimised level of integration of the whole supply chain, the industry has responded in various forms. This paper will discuss different initiatives by the researchers,construction industry,and the UK government in order to achieve optimal level of supply chain integration. This paper will discuss the concept of aggregation,and also look at other supply chain integration related concepts including client-led supply chain, knowledge about the whole supply chain, effects of procurement on integration of supply chain, etc. The paper will give a brief overview and initial findings of a project undertaken by the authors, and also include examples from the UK construction industry on bundling of the supply and demand.

  1. Design Principles for Closed Loop Supply Chains

    NARCIS (Netherlands)

    H.R. Krikke (Harold); C.P. Pappis (Costas); G.T. Tsoulfas; J.M. Bloemhof-Ruwaard (Jacqueline)

    2001-01-01

    textabstractIn this paper we study design principles for closed loop supply chains. Closed loop supply chains aim at closing material flows thereby limiting emission and residual waste, but also providing customer service at low cost. We study 'traditional' and 'new' design principles known in the l

  2. A modeling framework for supply chain simulation

    NARCIS (Netherlands)

    van der Zee, D.J.; van der Vorst, J.G.A.J.

    2002-01-01

    In many industries logistic optimization on a company scale is no longer sufficient to meet the competition. Nowadays, competition takes place between supply chains. Intrinsic to the concept and success of a supply chain is the tuning of the activities of the companies involved. Given the complexity

  3. Using Games to Teach Markov Chains

    Science.gov (United States)

    Johnson, Roger W.

    2003-01-01

    Games are promoted as examples for classroom discussion of stationary Markov chains. In a game context Markov chain terminology and results are made concrete, interesting, and entertaining. Game length for several-player games such as "Hi Ho! Cherry-O" and "Chutes and Ladders" is investigated and new, simple formulas are given. Slight…

  4. Towards effective food chains : models and applications

    NARCIS (Netherlands)

    Trienekens, J.H.; Top, J.L.; Vorst, van der J.G.A.J.; Beulens, A.J.M.

    2010-01-01

    Food chain management research can help in the analysis and redesign of value creation and the product flow throughout the chain from primary producer down to the consumer. The aim is to meet consumer and societal requirements effectively at minimal cost. In the Wageningen UR strategic research prog

  5. Operational excellence in logistics and supply chains

    OpenAIRE

    2015-01-01

    This volume contains research contributions by an international group of authors focusing on innovative models to optimize logistics and supply chains at an operational level. They address process efficiency and data-related aspects. Supply chain security insights are also given.

  6. Current Control Strategy of Chain Circuit STATCOM

    Institute of Scientific and Technical Information of China (English)

    WANG Xuan; FU Jian; TENG Letian; SUN Lijing; ZHAO Ruibin; WU Shouyuan; DENG Zhanfeng

    2012-01-01

    In order to study the current control strategy based on the chain circuit static synchronous compensator (STATCOM) dynamic model and the design control system with good stability and tracking accuracy, this paper applies the chain circuit STATCOM small signal AC model, and proposes the following assumptions:

  7. On robustness in food supply chain networks

    NARCIS (Netherlands)

    Vlajic, J.V.; Vorst, van der J.G.A.J.; Hendrix, E.M.T.

    2010-01-01

    Purpose: Today's business environment is characterized by challenges of strong global competition where companies tend to achieve leanness and maximum responsiveness to customer demand. Lean supply chain networks are vulnerable to all kind of disruptions. For food supply chain networks (FSCNs), due

  8. Using management information in broiler supply chains

    NARCIS (Netherlands)

    Yassin, H.

    2012-01-01

    The Dutch broiler supply chain involves several interdependent firms such as breeding and feed companies, rearing farms, breeder farms, broiler hatcheries and broiler farms. To stay competitive and sustain continuity, evaluation of production at each level of the chain is crucial. Good quality data

  9. Localized Lymph Node Light Chain Amyloidosis

    Directory of Open Access Journals (Sweden)

    Binod Dhakal

    2015-01-01

    Full Text Available Immunoglobulin-derived light chain amyloidosis can occasionally be associated with localized disease. We present a patient with localized lymph node light chain amyloidosis without an underlying monoclonal protein or lymphoproliferative disorder and review the literature of lymph node amyloidosis discussing work-up and risk factors for systemic progression.

  10. Waste Reduction in Fresh Food Supply Chains

    DEFF Research Database (Denmark)

    Kaipia, Riikka; Loikkanen, Lauri; Dukovska-Popovska, Iskra

    2011-01-01

    The paper studies a well-known phenomenon, information sharing in supply chains, in a new context, fresh foods, with a specific goal, supporting sustainable performance in the supply chain. Fresh foods are important for retail stores, representing around half of retail sales, but form a challenging...

  11. Molecular dynamics studies of entangled polymer chains

    NARCIS (Netherlands)

    Bulacu, Monica Iulia

    2008-01-01

    The thesis presents three molecular dynamics studies of polymeric ensembles in which the chain entanglement plays the major role in the internal dynamics of the system. A coarse-grained model is used for representing the polymer chains as strings of beads connected by finite-extensible springs. In a

  12. Bethe vectors for XXX-spin chain

    Science.gov (United States)

    Burdík, Čestmír; Fuksa, Jan; Isaev, Alexei

    2014-11-01

    The paper deals with algebraic Bethe ansatz for XXX-spin chain. Generators of Yang-Baxter algebra are expressed in basis of free fermions and used to calculate explicit form of Bethe vectors. Their relation to N-component models is used to prove conjecture about their form in general. Some remarks on inhomogeneous XXX-spin chain are included.

  13. Qualitative methodology for efficient food chain design

    NARCIS (Netherlands)

    Apaiah, R.K.; Hendrix, E.M.T.; Meerdink, G.; Linnemann, A.R.

    2005-01-01

    This paper presents a methodology to efficiently design food supply chains. The goals of quality, cost and environmental load are looked at independently of each other. Food chains are made up of links and are designed to deliver a particular product with consumer-specified attributes. These attribu

  14. Synchronize Your Supply Chain with RFID

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    1 Executive Summary Driving efficiencies throughout your supply chain and increasing the velocity of items through the supply chain from creation to consumer is more than a business mandate today; it’s a matter of business survival. If your company doesn’t do it, your competition will. Radio Frequency Identification (RFID) is a true next-generation

  15. Cooperation and profit allocation in distribution chains

    NARCIS (Netherlands)

    Guardiola, L.A.; Meca, A.; Timmer, J.B.

    2005-01-01

    We study the coordination of actions and the allocation of profit in distribution chains under decentralized control. We consider distribution chains in which a single supplier supplies goods for replenishment of stocks of several retailers who, in turn, sell these goods to their own separate market

  16. Extremal hexagonal chains concerning largest eigenvalue

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    In this paper, we define a roll-attaching operation of a hexagonal chain, and prove Gutman's conjecture affirmatively by using the operation. The idea of the proof is also applicable to the results concerning extremal hexagonal chains for the Hosoya index and Merrifield-Simmons index.

  17. Effective food supply chains; generating, modelling and evaluating supply chain scenarios

    NARCIS (Netherlands)

    Vorst, van der J.G.A.J.

    2000-01-01

    Logistical co-ordination in FMCG supply chains

    The overall objectives of the research described in this thesis were to obtain insight into the applicability of the concept Supply Chain Management (SCM) in food supply chains (SCs) from a logistical point of view, and to find an efficient and

  18. A conceptual framework for supply chain governance: An application to agri-food chains in China

    NARCIS (Netherlands)

    Zhang, X.Y.; Aramyan, L.H.

    2009-01-01

    Purpose - Chinese agri-food chains consist of the millions of small scale farmers, who are not well structured and organized in the supply chain. Owing to market liberalization and globalization, one of the most challenging issues along agri-food chains in China is becoming the issue of how to link

  19. Teaching Lean Six Sigma within a Supply Chain Context: The Airplane Supply Chain Simulation

    Science.gov (United States)

    Ellis, Scott C.; Goldsby, Thomas J.; Bailey, Ana M.; Oh, Jae-Young

    2014-01-01

    Lean six sigma is a management methodology that firms can employ to achieve substantial improvement in supply chain performance. However, few pedagogical exercises facilitate students' use of a comprehensive set of lean six sigma principles within a supply chain context. We describe the Airplane Supply Chain Simulation that helps students…

  20. Integrating product design into the supply chain

    DEFF Research Database (Denmark)

    Khan, Omera; Stolte, Terje; Creazza, Alessandro

    2016-01-01

    of opportunities and challenges when integrating product design and the supply chain and subsequently a step-by-step guide is developed to address these. Practical Implications: The research provides key recommendations to companies on how to create competitive capabilities by integrating product design...... into the supply chain. Originality/Value: This paper provides novel insights to both practitioners and researchers. For practitioners detailed recommendations are given on how they can maximise benefits through integrating product design into the supply chain. The RBV has been harnessed to highlight how......Purpose: The aim of the research is to illustrate how companies can create competitive capabilities through integration of product design into the supply chain. In doing so the paper reveals the challenges and the opportunities that companies face when integrating product design and supply chain...