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