Peak holding circuit for extremely narrow pulses

An improved pulse stretching circuit comprising: a high speed wide-band amplifier connected in a fast charge integrator configuration; a holding circuit including a capacitor connected in parallel with a discharging network which employs a resistor and an FET; and an output buffer amplifier. Input pulses of very short duration are applied to the integrator charging the capacitor to a value proportional to the input pulse amplitude. After a predetermined period of time, conventional circuitry generates a dump pulse which is applied to the gate of the FET making a low resistance path to ground which discharges the capacitor. When the dump pulse terminates, the circuit is ready to accept another pulse to be stretched. The very short input pulses are thus stretched in width so that they may be analyzed by conventional pulse height analyzers

Monostable multivibrator with complementary NOR gates Patent

Monostable multivibrator for producing output pulse widths with positive feedback NOR gate

Peak-holding circuit for extremely narrow pulses

Circuit was developed which can stretch pulses in 50- to 3200-ns range to make them acceptable for pulse-height analyzers. Circuit uses high-speed wide-band amplifier, does not need excessive frequency compensation, and can handle pulses one-tenth of width normally required by pulse analyzers

One-shot multivibrator with complementary metal-oxide-semiconductor components

Breadboard model is tuned to produce output pulses from one microsecond up to several seconds in width with up to 95 percent duty cycle, and with lower power consumption than previously existing circuits

Vision during manned booster operation Final report

Retinal images and accomodation control mechanism under conditions of space flight stres

The development of a solar powered residential heating and cooling system

A solar energy collector design is disclosed that would be efficient for both energy transfer and fluid flow, based upon extensive parametric analyses. Thermal design requirements are generated for the energy storage systems which utilizes sensible heat storage in water. Properly size system components (including the collector and storage) and a practical, efficient total system configuration are determined by means of computer simulation of system performance

Computational problems in autoregressive moving average (ARMA) models

The choice of the sampling interval and the selection of the order of the model in time series analysis are considered. Band limited (up to 15 Hz) random torque perturbations are applied to the human ankle joint. The applied torque input, the angular rotation output, and the electromyographic activity using surface electrodes from the extensor and flexor muscles of the ankle joint are recorded. Autoregressive moving average models are developed. A parameter constraining technique is applied to develop more reliable models. The asymptotic behavior of the system must be taken into account during parameter optimization to develop predictive models

Comparison between Single Shot Micromachining of Silicon with Nanosecond Pulse Shaped IR Fiber Laser and DPSS UV Laser

High power DPSS UV laser having high repetition rates (>100 kHz) are significant part of the cost of a laser Si micro-processing system. An alternative inexpensive solution, MOPA based IR fibre lasers, have been used to machine Si with high energy shaped pulses. This investigation evaluates the single pulse machining performance of a pulse shapeable IR (1062 nm) fibre laser and a DPSS UV (355 nm) laser on Si substrates and directly compares their performance. The machined depth data was measured with a white light interferometer and the finishing quality examined for surface defects with a SEM. Theoretical analysis demonstrated rapid heating effects by taking account of the dynamic optical and thermal properties of Si for given IR laser pulse shapes. The results show that high quality Si surface micro-processing can benefit from using the more flexible, more reliable, and pulse shapeable IR fibre laser at high repetition rates which no conventional solid state IR or UV laser could achieve.This work was supported in part by the Engineering and Physical Sciences Research Council (EPSRC), U.K., under Grant RG 453279, and by the SPI Lasers, Southampton, U.K.This is the accepted manuscript. The final version is available from IEEE at http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6687309

Research and development study on multimode system applications in the area of time of flight and coincidence measurements

Technical specifications for multimode digital storage device, and applications to time of flight and coincidence measurement

Strategic planning as a focus for continuous improvement. A case study

What do most of the successful people and organizations in our world have in common? Instead of worrying about the future, they work to create it. They have a plan, or a vision of what they want to accomplish and they focus their efforts on success. Strategic planning has been described as a disciplined, ongoing process to produce fundamental decisions and actions that shape what an organization is, what it does, and how it will respond to a changing environment. This case study discussion will evaluate the relationship between strategic planning and Total Quality Management (TQM), or continuous improvement, through the experience of the NASA Johnson Space Center in developing a strategy for the future. That experience clearly illustrates the value of strategic planning in setting the framework and establishing the overall thrust of continuous improvement initiatives. Equally significant, the fundamentals of a quality culture such as strong customer and supplier partnerships, participative involvement, open communications, and ownership were essential in overcoming the challenges inherent in the planning process. A reinforced management commitment to the quality culture was a clear, long-term benefit