In this paper, the general governing equations of three-dimensional vibrations of an Euler-Bernoulli Beam under influences of system dynamics are derived by the Hamiltonian method. Then two fundamental cases of a cantilever beam and a rotating beam are considered. The conventional methods for vibration suppression debit to expenses and make new problems such as control spillover because they ar...

This paper proposes a new measurement scheme of gas concentration by infrared sensor, for high accuracy measurement of gas concentration and safety protection. Furthermore, the principle of infrared absorption, test methods and optical chamber structure are expounded. And a double-beam differential detection system is designed. The paper key to introduce the software and hardware design of infr...

We demonstrate a versatile interference lithography system that can continuously vary the pattern period and orientation during fabrication of general periodic structures in one or two dimensions. Initial experimental results, using closed-loop beam steering control and double exposures on a stationary substrate, are obtained in order to illustrate its principle of operation. A fringe-locking s...

We report experimental observation of three-field noise correlation between two coexisting four-wave mixing (FWM) signals and the probe signal in a coherently-prepared rubidium vapor system. The two FWM signals in a double-Λ type quasi-four-level atomic system are obtained in different directions via their respective phase-matching conditions and can be detected individually. These signals and ...

The generation of highly collimated electron beams from a double-gate field emitter array with 40000 metallic tips and large collimation gate apertures is reported. Field emission beam measurements demonstrated the reduction of the beam envelope down to the array size by applying a negative potential to the on-chip gate electrode for the collimation of individual field emission beamlets. Owing ...

This paper is an experimental study on the behavior of vertical shear link in the single and double configurations. There have been three specimens selected for examining the effects of different details .The first specimen was an I section with no stiffener, while the second specimen composed of I section with stiffeners designed according to AISC 2005. Third specimens were composed of two I s...

We present a preliminary direct measurement of the parity violating coupling of the Z 0 to strange quarks, A s , derived from a sample of approximately 300,000 hadronic decays of Z 0 bosons produced with a polarized electron beam and recorded by the SLD experiment at SLAC between 1993 and 1997. Z 0 → s¯ s events are tagged by the presence in each event hemisphere of a high-momentum K ± , K 0 s ...

We present an updated direct measurement of the parity-violating coupling of the Z 0 to strange quarks, A s , derived from the full SLD data sample of approximately 550,000 hadronic decays of Z 0 bosons produced with a polarized electron beam and recorded by the SLD experiment at SLAC between 1993 and 1998. Z 0 ! s s events are tagged by the presence in each event hemisphere of a high-momentum ...

We discuss the minimum requirements for a neutrino beta beam if θ13 is discovered by an upcoming reactor experiment, such as Double Chooz or Daya Bay. We require that both neutrino mass hierarchy and leptonic CP violation can be measured to competitive precisions with a single-baseline experiment in the entire remaining θ13 range. We find that for very high isotope production rates, such as the...