Key Technology of Cutting and Moving Large Spherical Tank

This paper mainly introduces the scientific cutting and hoisting construction technology before the large spherical tank(hereinafter referred to as spherical tank)moving and loading,so as to better ensure the construction quality of field assembly and welding in the process of spherical tank moving and loading.

GERBER TECHNOLOGY LAUNCHES FIRST OF NEW SERIES OF CUTTING SOLUTIONS

Precision, Productivity and Performance def ine the GERBERcutter? Z7Tolland, Conn., USA – Gerber Technology, a business unit of Gerber Scientific, Inc. (NYSE: GRB), and the world leader in providing innovative integrated software and hardware automation systems to

Computer Aided Alloy Design of High Performance Prehardened Mold Steel for Plastic

prehardened mold steel for plastic, Thermo-Calc ＆ DICTRA software package, machinability, heat treatment technology, free cutting phase.

Pakistan-USA Student Dialogue： Using Videoconference for International Civic Engagement

The United States Department of State funded a project focused on civic engagement. The participants were students and faculty at five universities in Pakistan and in the USA. The author is a representative from one of the USA-based universities. In a fortnightly high-definition videoconference dialogue between students at University of Nebraska at Omaha and Quaid-i-Azam University in Islamabad, the goals of deepening understanding, challenging stereotypes and inspiring community change are being met. This paper will present the preliminary results of an ongoing assessment of how this project has resulted in meeting these goals and suggest what can be done in future projects that will better meet the goals. This will add to the emerging literature on civic engagement and conflict resolution by exploring use of cutting edge technology to build trust and understanding across the world＇s divide.

A new technique for high-fidelity cutting technology for hydrate samples

Designing a high-fidelity cutting device is one of the difficulties in hydrate samples pressure-holding transfer.Due to the limitations of the existing mechanical system,there is much damage to the cut surface of hydrate samples,with many chips produced,which seriously affects the quality of samples.In this paper,a new cutting device utilizes two servo motors to achieve a high degree of automation.Using the Archimedes spiral,it achieves low disturbance of the cut surface and provides accurate control of the process.In addition,due to the operation of the sample long-stroke push unit,cutting hydrate samples of any length with almost no chips within a short cutting time can be achieved.Laboratory and sea tests have achieved all design requirements of the equipment and strongly demonstrate its benefit and stability.It is concluded that this new high-fidelity cutting technology is practically efficient.The physical state of the hydrate can be maintained to the greatest extent,and thus the new equipment provides significant support for the exploration and development of hydrate resources.

Risk field assessment of longwall working face by the double-sided roof cutting along the gob

In order to study the mechanism of the dual side roof cutting technology on the composite disaster of gas and coal spontaneous combustion in goaf,a model for the evolution of porosity and permeability in the dual side roof cutting working face was constructed.The location of the occurrence of the compound disaster of gas explosion and coal spontaneous combustion under the double-sided roof cutting mode was studied,and the sensitivity of the evolution pattern of the compound disaster area to the amount of air supply and gas gush was summarized.The results indicate that the top cutting pressure relief technology significantly reduces the permeability of porous media,and the sensitivity of the goaf on the intake side to airflow disturbances is significantly reduced.As the volume of air supply increases,the distance between the gas explosion risk area and the coal spontaneous combustion risk area gradually decreases,and the probability of composite disaster areas is 0.The increase of air supply and gas emission makes the gas concentration in the middle and deep goaf increase in an exponential function,and the width of the gas explosion risk area increases gradually.When the outflow reaches 40 m^(3)/min,there is no composite disaster zone,indicating that the rapid increase in outflow inhibits the occurrence of composite disasters.