ORGANIZATION FOR BREAKING THE POVERTY CYCLE IN RURAL AREAS

Food Security and Poverty,

A model study of the application of roof bolts under unsymmetrical loading conditions

When coal is extracted by the long wall mining method, two gate-roads on either side of the working face are driven with the advancing operation. In the surroundings of these openings the state of stress which existed prior to mining is not only disturbed by the drifting process of the gate-roads but also by the coal extraction in the long wall, resulting in an unsymmetrical stress distribution. Varying incremental pressure components and the high complexity of strata movements make it extremely difficult to control the rock behavior under unsymmetrical conditions by conventional support. Application of roof bolts as an auxiliary support can improve the control of the strata surrounding long wall gate-roads. To indicate the qualitative effect of roof bolts on the stress distribution around underground openings in stratified rock under unsymmetrical loading conditions, composite models made of photo-elastic material were tested in a 6 ft. diameter centrifuge, providing proper loading conditions. Stress distributions were permanently frozen into the models while under load. Test results indicate that the high shearing stresses which occur near the rigid abutment of the long wall gate-road and the bending stresses in the roof beams can be reduced considerably by the application of roof bolts in proper pattern arrangements. Since this study was concerned with the development of an experimental technique and simple structural conditions were chosen, an extension of this investigation to more complicated conditions is possible --Abstract, page i

Historical highlights of the Eighty-ninth Chemical Mortar Battalion

On November 5, 1943, the 89th Chemical Battalion, Motorized, was activated at Camp Roberts, California per General Orders, Headquarters, 4th Army, by Command of Lt. General William A. Simpson. Major James R. Hudson, CWS, a reserve officer with experience in World War I in the Field Artillery, assumed command.https://digicom.bpl.lib.me.us/ww_reg_his/1040/thumbnail.jp

Excitonic - vibronic coupled dimers: A dynamic approach

The dynamical properties of exciton transfer coupled to polarization vibrations in a two site system are investigated in detail. A fixed point analysis of the full system of Bloch - oscillator equations representing the coupled excitonic - vibronic flow is performed. For overcritical polarization a bifurcation converting the stable bonding ground state to a hyperbolic unstable state which is basic to the dynamical properties of the model is obtained. The phase space of the system is generally of a mixed type: Above bifurcation chaos develops starting from the region of the hyperbolic state and spreading with increasing energy over the Bloch sphere leaving only islands of regular dynamics. The behaviour of the polarization oscillator accordingly changes from regular to chaotic.Comment: uuencoded compressed Postscript file containing text and figures. In case of questions, please, write to [email protected]

Time Synchronization Server

Report presents the results of IST\u27s installation and integration of Network Time Protocol (NTP) and a Global Positioning System (GPS) receiver into the Distributed Interactive Stimulation (DIS) TESTBED located in IST\u27s laboratories