A silvicultural container is provided which is useful for the germination of seeds and nurturing of seedling plants until such time as they are transplanted, container and all, into the field. The container is of such construction and composition that it can be triggered to provide a balanced nutrient source for soil bacteria and the delicate young seedling at the time of transplantation.

A family of active filter circuits. Each filter has two time constant networks with each network having an element in one loop of a multi-loop feedback circuit for an amplifier. A generalized transfer function e.sub.o /e.sub.in = as.sup.2 + bs + c/(A+1)T1T2 s.sup.2 + [(A+1)T1 + T2]s + (A+1) describes the operation of each active filter. In this function, A is amplifier gain and T1 and T2 are time constants for the two time constant networks. Some specific circuits have a transfer function in whi...

A process for the preparation of active magnesium oxide having a large specific area by dispersing magnesium hydroxide or oxide with water forming a turbid liquid having a turbidity density of about 5 to 20 percent and vigorously agitating the liquid for about 5 to 60 minutes, the temperature of the turbid liquid being kept at about 80.degree. to 110.degree. C throughout the process, by introducing steam, washing the filter cake, drying and calcining the separated magnesium compound to obtain la...

A high input impedance linear amplifier is disclosed. The amplifier circuit has an input impedance resistance which is designed for proper DC biasing, but is too low to accommodate an AC input from a high impedance source. The circuit, through a voltage divider and a semiconductor, effectively provides a very high dynamic impedance to the incoming AC signal.

Peptides whose aminoacid sequence differs from that of the ACTH-active peptides containing the first three aminoacids of ACTH in that of the serine residues in 1- and 3-position at least that in 3-position is replaced by glycine. These peptides have a stronger and/or longer lasting ACTH-activity than the corresponding peptides containing the natural first three aminoacids.

Bistable memory elements having a pair of active transistor components are provided with separate voltage supply lines. The collector and/or emitter circuits of each transistor pair are selectively connected to different ones of the voltage supply lines, which are actuated in sequence to set each memory element into a predetermined initial state, thus combining the advantages of read-only operation with random access capabilities.

A first electrical source is connected to an electro-magnet by silicon-controlled rectifiers (SCR's) to produce a rapid rise in current in the load. A second electrical source is then connected by SCR's to the load and the first is disconnected to produce a constant current in the load. A connection is then established to discharge the stored energy from the electromagnet, producing a rapid drop in current, and the second source is disconnected. The stored energy may be returned to the first ele...

This invention is directed to a device for actively cooling the propellant grain of a missile during captive or free flight when aerodynamic heating conditions are present. The device consists of a helically arranged coolant coil embedded in a liner that separates the missile propellant from the missile case.

An isotope capsule carried at the end of a radio-active source holder is handled by retracting the source holder from one position into a curved passage of a guide member through an inlet at one end of the passage, turning the guide member through an angle of less than 360.degree. about the central axis of the other end of the passage, and then ejected through the inlet into a different position. Manipulating apparatus for withdrawing and inserting the radio-active source holder from and to a ho...

Organoboron compound having a structure exhibiting a hydrophilic group skeleton including a semipolar bond under normal conditions and a complex ion group skeleton in a basic medium or solution; the process for production of this compound; and its applications as an emulsifier and anti-static agent for plastics and as a heat stabilizer for plastics.