1,681 research outputs found
Tube-to-header joint for bimetallic construction
Design advantages of bimetallic construction enables an all-welded bimetallic joint to be made from the accessible header side of the tube-to-header joint. In the two-piece header design the weld joints completely seal the tube-header plate crevice and prevent crevice and stringer corrosion
Determination of the weldability and elevated temperature stability of refractory metal alloys quarterly report no. 6, 21 sep. - 20 dec. 1964
Determination of weldability and elevated temperature stability of refractory metal alloy
Determination of the weldability and elevated temperature stability of refractory metal alloys Ninth quarterly report, 21 Jun. - 20 Sep. 1965
Tensile strength and thermostability of welded refractory metal joint
Determination of the weldability and elevated temperature stability of refractory metal alloys seventh quarterly report, dec. 21, 1964 - mar. 20, 1965
Weldability and elevated temperature stability of refractory metal alloy
Determination of the weldability and elevated temperature stability of refractory metal alloys Tenth quarterly report, 21 Sep. - 20 Dec. 1965
Weldability and long time elevated temperature stability of refractory metal alloys for advanced alkali-metal space electric power system
Determination of the weldability and elevated temperature stability of refractory metal alloys Eighth quarterly report, Mar. 21 - Jun. 20, 1965
Weldability and elevated temperature stability of refractory metal alloy
THE BIOMECHANIST AS EXPERT WITNESS
INTRODUCTION
There is a critical need for qualified Biomechanists in the areas of civil and criminal litigation. Currently few "true Biomechanists" work in this area. This has resulted in a vacuum of qualified personnel being filled by people who speak to biomechanical issues with little or no education, training, and experience in anatomy, kinesiology, physiology, research methods, statistics and other areas that constitute the discipline of Biomechanics. The result is that legal decisions are made based upon incorrect or inadequate information.
We suggest that as professional Biomechanists we may have a responsibility to enter this area or in our absence abdicate our role to less qualified individuals. If we as a discipline do engage this role we will upgrade the quality and truthfulness of at least a portion of the litigation process
Tricritical behavior in itinerant quantum ferromagnets
It is shown that the peculiar features observed in the low-temperature phase
diagrams of ZrZn_2, UGe_2, and MnSi can be understood in terms of a simple
mean-field theory. The nature of the ferromagnetic transition changes from
second order to first order at a tricritical point, and in a small external
magnetic field surfaces of first-order transitions emerge which terminate in
quantum critical points. This field dependence of the phase diagram follows
directly from the existence of the tricritical point. The quantum critical
behavior in a nonzero field is calculated exactly.Comment: 4pp., 4 eps figure
Landau-Zener-Stueckelberg effect in a model of interacting tunneling systems
The Landau-Zener-Stueckelberg (LZS) effect in a model system of interacting
tunneling particles is studied numerically and analytically. Each of N
tunneling particles interacts with each of the others with the same coupling J.
This problem maps onto that of the LZS effect for a large spin S=N/2. The
mean-field limit N=>\infty corresponds to the classical limit S=>\infty for the
effective spin. It is shown that the ferromagnetic coupling J>0 tends to
suppress the LZS transitions. For N=>\infty there is a critical value of J
above which the staying probability P does not go to zero in the slow sweep
limit, unlike the standard LZS effect. In the same limit for J>0 LZS
transitions are boosted and P=0 for a set of finite values of the sweep rate.
Various limiting cases such as strong and weak interaction, slow and fast sweep
are considered analytically. It is shown that the mean-field approach works
well for arbitrary N if the interaction J is weak.Comment: 13 PR pages, 15 Fig
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