Acoustical news Calendar

October 2—5,l 990 High T~tra,Strbske Pleso Czecnoslovakia 29th Acoustical Conference on“Room,building and Urban Acoustics” Contact:House of Technology,Ing.L.Goralikova Skultetyho U1.1,823 27 Bratislava,October 15——17,1990,The University of Texas,Austin,Texas USA l 990 National Conference on Noise Control Engineering Reducing the Annoyance of Noise Contact:T’he University of Texas as Austin continuing Engineering Studies P.O.BOX 7727 Austin,Texas 787 1 3—9953November 2…     

Hydrogen passivation of multi—crystalline silicon solar cells

The effects of hydrogen passivation on multi-crystalline silicon (mc-Si) solar cells are reported in this paper. Hydrogen plasma was generated by means of ac glow discharge in a hydrogen atmosphere. Hydrogen passivation was carried out with three different groups of mc-Si solar cells after finishing contacts. The experimental results demonstrated that the photovoltaic performances of the solar cell samples have been improved after hydrogen plasma treatment, with a relative increase in conversion efficiency up to 10.6\%. A calculation modelling has been performed to interpret the experimental results using the model for analysis of microelectronic and photonic structures developed at Pennsylvania State University.     

International Symposium on Photonics, Biophotonics,and Nanophotonics'2005

The "International Symposium on Photonics, Biophotonics, and Nanophotonics'2005", sponsored by Chinese Optical Society (COS), State University of New York at Buffalo (SUNY at Buffalo), and Southeast University (SEU), will be held on May 14 - 18, 2005 at Nanjing, China. This conference will provide an international forum for the most recent and advanced issues concerning photonics, biophotonics, and nanophotonics. There will be a number of invited talks presented by pioneers and leading scientists in the fields of photonics, biophotonics, and nanophotonics. In particular, a tutorial session will be presented by Prof. Paras N. Prasad to discuss biophotonics and nanophotonics.     

Erratum: A Ubiquitous Thermal Conductivity Formula for Liquids,Polymer Glass,and Amorphous Solids [Chin. Phys. Lett. 37(2020) 104401]

正In the Acknowledgement, the following sentence "JH and JL are supported by the National Science Foundation (Award number CBET-1943813) and the Faulty Research and Professional Development Fund at North Carolina State University" should be changed to "JH and JL are supported by the Faulty Research and Professional Development Fund at North Carolina State University".     

Argonne国家实验室ECR离子源在固体材料离子束流产生方面的研究进展

Development work with solid materials at the Argonne National Laboratory ECR ion sources has been focused on two areas-introduction of materials with low vapour pressures,and increasing the beam intensities of heavy beams(i.e.-lead and uranium).An induction oven,with a demonstrated operating temperature extending to 2000℃,has been utilized to produce a Ti-50 beam with an intensity of 5.5eμA (12 ).In addition,a refinement of the sputter technique has been employed which has resulted in a 42% improvement in lead beam intensities.Details of the induction oven as well as the refined sputter technique will be presented.     

IPv6 in ESnet

The importance of the Internet to modern High Energy Physics Collaborators is clearly immense,and understanding how new developments in network technology impact networks is critical to the future design of experiments.The next generation Internet Protocol(IPv6) is being deployed on testbeds and production networks throughout the world.The protocol has been designed to solve todays internet problems,and many of the features will be core Internet services in the future.In this talk the features of the protocol will be described.Details will be given on the deployment at sites important to High Energy Physics Research and the network services operating at these sites,In particular IPv6 deployment on the U.S.Energy Sciences Network(ESnet)will be reviewed.The connectivity and performance between High Energy Physics Laboratories,Universities and Institutes will be discussed.     

Proposed Space Test of the New Equivalence Principle with Rotating Extended Bodies

We propose a novel scheme for a space free-fall based test of the new equivalence principle （NEP） with two rotating extended bodies made of the same material. The measurement will be carried out by placing the two concentric spinning masses of very different momenta inside a differential electrostatic aceelerometer in a drag-free compensated orbit. A difference in the forces necessary to maintain the common trajectory will be an indication of a violation of equivalence or the existence of spin-spin force between the rotating mass and the Earth. The conceptual design of the inertial sensor and its operation mode is presented. Details specific to the model and performance requirements are discussed by using up-to-date space technologies to test the NEP with an accuracy of better than 10^-15.     

In the Land of the Dinosaurs,How to Survive Experience with Building of Midrange Computing Cluster

This paper discusses how to put into operation a midrange computing cluster for the Nuclear Chemistry Group(NCG) of the State University of New York at STONY Brook(SUNY-SB).The NCG is part and one of the collaborators within the RHIC/Phenix experiment located at the Brookhaven National Laboratory(BNL).The Phenix detector system produces about half a PB(or 500 TB) of data a year and our goal was to provide to this remote collaborating facility the means to be part of the analysis process.The computing installation was put into operation at the beginning of the year 2000.The cluster consists of 32 peripheral machines running under Linux and central server Alpha 4100 under DIgital Unix 4.of (formally True Unix 64),In the paper the realization process is under discussion.     

Characteristics of the spatiotemporal distribution of daily extreme temperature events in China: Minimum temperature records in different climate states against the background of the most probable temperature

Based on the skewed function,the most probable temperature is defined and the spatiotemporal distributions of the frequencies and strengths of extreme temperature events in different climate states over China are investigated,where the climate states are referred to as State I,State II and State III,i.e.,the daily minimum temperature records of 1961-1990,1971-2000,and 1981-2009.The results show that in space the frequency of high temperature events in summer decreases clearly in the lower and middle reaches of the Yellow River in State I and that low temperature events decrease in northern China in State II.In the present state,the frequency of high temperature events increases significantly in most areas over China except the north east,while the frequency of low temperature events decreases mainly in north China and the regions between the Yangtze River and the Yellow River.The distributions of frequencies and strengths of extreme temperature events are consistent in space.The analysis of time evolution of extreme events shows that the occurrence of high temperature events become higher with the change in state,while that of low temperature events decreases.High temperature events are becoming stronger as well and deserve to be paid special attention.     

Equilibrium points and bifurcation control of a chaotic system

Based on the Routh-Hurwitz criterion, this paper investigates the stability of a new chaotic system. State feedback controllers are designed to control the chaotic system to the unsteady equilibrium points and limit cycle. Theoretical analyses give the range of value of control parameters to stabilize the unsteady equilibrium points of the chaotic system and its critical parameter for generating Hopf bifurcation. Certain nP periodic orbits can be stabilized by parameter adjustment. Numerical simulations indicate that the method can effectively guide the system trajectories to unsteady equilibrium points and periodic orbits.     

LATTICE QUANTUM CHROMODYNAMICS

<正>Updated September 2013 by S.Hashimoto(KEK),J.Laiho(Syracuse University),and S.R.Sharpe(University of Washington).18.1.Lattice regularization of QCD Gauge theories form the building blocks of the Standard Model.While the SU(2)and U(l)parts have weak couplings and can be studied accurately with perturbative methods,the SU(3)component—QCD—is only amenable to a perturbative treatment at high energies.The growth of the coupling constant in the infrared—the flip-side of asymptotic freedom—requires the use of non-perturbative methods to determine the low energy properties of QCD.Lattice gauge theory,proposed by K.Wilson in 1974[1],provides such a method,for it gives a non-perturbative definition of vector-like gauge field theories like QCD.In lattice regularized QCD—commonly called lattice QCD or LQCD—Euclidean space-time is discretized,usually on a hypercubic     

Tunable Diode Laser Absorption Spectroscopy Detection of N2O at 2.1μm Using Antimonide Laser and InGaAs Photodiode

Tunable diode laser absorption spectroscopy detection of N2 0 around 2.1 μm is demonstrated by using a homemade InGaAsSb/AlGaAsSb MQW laser diode and an InGaAs wavelength extended photodiode. Details of the devices and the detection system are described. In the system, the laser is driven by low frequency pulses with long duration to form a wavelength scan around 4741 cm^-1; the absorption information is obtained from the detected signal of the photodiode. By using a gas cell with 15cm path length, a detection limit is estimated to be smaller than 0.2 Torr.     

QUARK MODEL

<正>Revised August 2013 by C.Amsler(University of Bern),T.DeGrand(University of Colorado,Boulder),and B.Krusche(University of Basel).15.1.Quantum numbers of the quarks Quantum chromodynamics(QCD)is the theory of the strong interactions.QCD is a quantum field theory and its constituents are a set of fermions,the quarks,and gauge bosons,the gluons.Strongly interacting particles,the hadrons,are bound states of quark and gluon fields.As gluons carry no intrinsic quantum numbers beyond color charge,and because color is believed to be permanently confined,most of the quantum numbers of strongly interacting particles are given by the quantum numbers of their constituent quarks and antiquarks.     

BIG-BANG COSMOLOGY

<正>Revised September 2013 by K.A.Olive(University of Minnesota)and J.A.Peacock(University of Edinburgh).22.1.Introduction to Standard Big-Bang Model The observed expansion of the Universe[1-3]is a natural(almost inevitable)result of any homogeneous and isotropic cosmological model based on general relativity.However,by itself,the Hubble expansion does not provide sufficient evidence for what we generally refer to as the Big-Bang model of cosmology.While general relativity is in principle capable of describing the cosmology of any given distribution of matter,it is extremely fortunate that our Universe appears to be homogeneous and isotropic on large scales.Together,homogeneity and isotropy allow us to extend the Copernican Principle to the Cosmological Principle,stating that all spatial positions in the     

Design and Evaluation of a Differential Accelerometer for Drop-Tower Equivalence Principle Test with Rotating Masses

A differential accelerometer comprising of two rotating masses made of the same material is proposed for drop tower-based free-fall testing of the spin-spin force between the rotating mass and the Earth. The measurement is performed b.y placing the two concentric masses of ver.y different momenta in a vacuum drop capsule which is falling freel.y in the Earth's gravitational field. A nonzero output of the differential accelerometer is an indication of possible violation of new equivalence principle(NEP). We present the conceptual design of a modified free-fall NEP experiment which can be performed at the Beijing drop tower. Design and evaluation of the differential accelerometer with a h.ybrid electrostatic/magnetic suspension s.ystem are presented to accommodate for operation on ground and drop-tower tests. Details specific to the measurement uncertainty are discussed to yield an NEP test accuracy of 7.2 × 10~(-9).     

Acoustical News SECOND WESTERN PACIFIC REGIONAL ACOUSTICS CONFERENCE

Confernce Notice—Circular No.1 November 28—30,1985 Hong Kong PolytechnicFurther InformationAdditional information may be obtained from the Organising Committee Secretariat at: —WESTPAC II,c/o Division of Part-time and Short Course Work,Hong Kong Polytechnic,Hung Hom,Kowloon,Hong Kong.The ConferenceFollowing the success of the first Western Pacific Acoustics Conference which was held inSingapore in 1983 it has been decided to hold the second conference in Hong Kong.     

Output regulation for linear multi-agent systems with unmeasurable nodesOutput regulation for linear multi-agent systems with unmeasurable nodesOutput regulation for linear multi-agent systems with unmeasurable nodes

The output regulation of linear multi-agent systems with partial unmeasurable agents is investigated in this paper. All the agents except the exosystem can be classified into two groups. Agents in the first group can be measured by themselves and their neighbors. State variables are not fully accessible for direct communication and full order Luenberger observers are constructed for the unmeasurable agents. We give a state feedback control law to solve the output regulation problem under the communication topologies based on both measurable and unmeasurable agents. The heterogeneous agents＇ synchronization problem is a general case of our results. Finally, examples are utilized to show the effectiveness of the obtained results.     

Output regulation for linear multi-agent systems with unmeasurable nodes

The output regulation of linear multi-agent systems with partial unmeasurable agents is investigated in this paper. All the agents except the exosystem can be classified into two groups. Agents in the first group can be measured by themselves and their neighbors. State variables are not fully accessible for direct communication and full order Luenberger observers are constructed for the unmeasurable agents. We give a state feedback control law to solve the output regulation problem under the communication topologies based on both measurable and unmeasurable agents. The heterogeneous agents’ synchronization problem is a general case of our results. Finally, examples are utilized to show the effectiveness of the obtained results.     

A DEEP-TOWED SIDE-SCANNING SONAR FOR DEEP-SEA TOPOGRAPHICAL SURVEY

Deep-Towed Side-Scanning Sonar(DTSSS)for topographical survey has the feature of highresolution by using a deep-towed operating mode.The DTSSS can be operated on both sides anda variety of applications has been found.It consists of an underwater towing system,a transmittingsystem,a receiving system and a dry electric spark recorder.The excellent underwater towing systemallows the DTSSS to operate in any region at depths of less than l000m.The working range oneach side is 500m.Combining it with echo sounder the DTSSS can be used to survey the local terrainof the bottom in water depths of l000m and provide information in detail.If using a short cableinstead of a long one,the DTSSS can be operated in shallow water then its source level can be raised6 dB and its working range on each side can be increased to 750m.Furthermore it can also beused as an underwater acoustic measuring instrument in order to investigate sea-bottom reverbera-tion and the behaviors of deep scattering layers.