Narrow Results

The Generalized Parton Distributions (GPDs) constitute an appropriate framework for a universal description of the partonic structure of the nucleon. Double Deeply Virtual Compton Scattering (DDVCS) process provides the only experimental way to measure independently the dependences of the GPDs on the average and transferred momentum. This proceeding discusses the feasibility of a DDVCS experiment in the context of JLab 12 GeV, model-predicted pseudo-data, and extraction of the relevant GPDs information based on a fitter algorithm.

In terms of dehydrating test on alfalfa, 5HC-1 type of conservation herbage dryer by advanced technology such as steel wire-bed conveyer, waste hest retrieving, turning over in airflow and mixed drying was designed, manufactured and tested. This paper describes the design and test of concurrent-flow dryer for conservation of quality on the basis of the experiment. The drying process-flow, construction and drying parameters of the dryer are presented. This designed dryer is suitable for farm, pasture and livestock-raising. Quality of dried alfalfa is good. This dryer is more efficient and adaptable. The cost of dryer is lowered. So the extension and application of the 5HC-1 type of conservation herbage are helpful to accelerate development of intensive breeding.

Some interesting examples are given in this article to show how one can learn and investigate mathematics through experiments with the help of computers. Each example begins with a problem. Trying to solve the problem one experiences exploration, invention and application of mathematics in the process.

In this paper the finite element procedure for analysing the postbuckling behaviours of shallow spherical shells is developed. The numerical simulations for the previously tested experimental data of pressurised thin-walled shallow spherical shells have been done by using a degenerated nine-node shell element with mixed interpolation functions. The nonlinear pre-buckling paths have been statically calculated, and then the corresponding postbuckling behaviours have also been obtained through nonlinear dynamic analysis. It is shown that if both an internal and an external viscous damping are considered, the good simulations even for the dynamic postbukling paths can be obtained.

The backfill was assumed infinite when calculating the earth pressure using Coulomb’s or Rankine’s theory. Actually most of the retaining walls we meet often have the narrow space of backfill. Due to the active wedge development limited by narrow backfilling space behind retaining wall, the active earth pressure (hereinafter referred to as AEP) is less than the theoretical calculation results. In this paper, the author studied the AEP on rigid retaining walls (hereinafter referred to as RRW) using experimental study. In the experiments, the narrow backfill space was mainly restricted by different backfill width and inclination of the rock face. The AEP on RRW with narrow backfill space is usually far less than the theoretical calculation results. And the ratio of the value of the AEP in the study over the value of theoretical solution is about 0.5-0.7. In addition, this paper also studied the effect of the aspect ratio of the backfill on AEP.

Among experiments looking for strangeness in nuclear systems, electron scattering Parity-Violation (PV) type experiments aim mainly at measuring the strange quark contributions to the form factors of the proton. They can be accessed by measuring the asymmetry in longitudinally polarized electron elastic scattering. The PV asymmetry is measured at the 10^-7 level of accuracy, and when combined with the electromagnetic form factors of the nucleon, the strange form factors can be determined. The full separation of form factors according to quark flavour requires measurements at forward angles on hydrogen and at backward angles on hydrogen and deuterium. The experimental setup used for G0 in the two different configurations is described. The status of the analysis and the current results are presented and discussed in relation with other experiments past and planned. A few comments are also made regarding some other aspects of physics accessible in simultaneous measurements: neutral currents in NΔ transitions, parity violation in inclusive π^- production and 2_γ contributions to elastic scattering.

Deterministic chaos machine consisting of the plane triple pendulum as well as of driving and measurement subsystems is presented and studied. The pendulum-driving subsystem consists of two engines of slow alternating currents and optoelectronic commutation. In addition, a mathematical model of the experimental rig is derived as a system of three second order strongly nonlinear ODEs. Mathematical modeling includes details, taking into account some characteristic features (for example, real characteristics of joints built by the use of roller bearings) as well as some imperfections (asymmetry of the forcing) of the real system. Parameters of the model are obtained by a combination of the estimation from experimental data and direct measurements of the system's geometric and physical parameters. A few versions of the model of resistance in the joints are tested in the identification process. Good agreement between both numerical simulation results and experimental measurements have been obtained and presented.

A mathematical model was set up to simulate the heat transfer process and performance of the molten salt phase change heat storage tank of the solar power and cooling system driven by Linear Fresnel reflector(LFR). Meanwhile, an experiment is also built to validate the model. For this thermal storage tank, mature industrial intermediate-temperature ternary salt is selected. ANSYS software is utilized to simulate the performance of heat transfer process of phase change based on the enthalpy method. Heat transfer characteristics and factors are analyzed according to the results of the simulation and experiment. The results show that the data coming from the simulation and the test fit each other well and the simulation is acceptable.

In this paper, the theory of axial vibration of coupling and declutching friction pairs at high line speed was studied. At first, the vibration analysis model of friction pairs that were coupling was built, and its thermal distortion was analyzed at high line speed. The second, for solving interaction theory of thermal distortion, micro-bulges model of two interaction friction surfaces was built by ways of micro-interaction dynamics. And then, by using mathematic statistics and normalization methods, equations of macro-normal contact forces were obtained, and the characteristics of vibration were simulated. At last, the vibration and temperature experiments were tested, and the result of simulation was validated by contrasting with testing. The results are shown that the max error of absolute value is less than 11.9%, and the precision of simulation model is conformable to desire.