[en] The present research interprets various binary, ternary and quaternary interactions using a generalised liquid solution model for the Ga-In-As-Sb alloys at 973 and 1073 K. The excess free energy equations for the liquid and solid solutions are used in conjunction with the solid-liquid equilibrium data in order to express equilibrium properties including the evaluation of the quaternary interactions in the alloys. The use of the derived values of the equation enables one to interpret the phase equilibria and thermodynamic properties of the system

[en] Activities of aluminium in aluminium-bismuth-antimony alloys have been determined over the temperature range (1173 to 1323) K by a concentration cell technique involving the chloride electrolytes. The measured activities in the system exhibit positive deviation from ideal behaviour over the entire range of composition studied. The deviation increases progressively with the Bi content of the alloys for a constant compositional path of Sb. However, the deviation decreases substantially with the increase of Sb content in the system. The proposed equation is capable of interpreting the experimental data pertaining to the liquid-liquid immiscibility in the system. The ternary interaction parameters involved in the equation are susceptible to the physico-chemical interpretation based on the central atoms model

No abstract available

[en] Models are described for use in site-specific environmental consequence analysis of nuclear reactor accidents of Classes 3 through 9. The models presented relate radioactivity released to resulting doses, health effects, and costs of remedial actions. Specific models are presented for the major exposure pathways of airborne releases, waterborne releases and direct irradiation from activity within the facility buildings, such as the containment. Time-dependent atmospheric dispersion parameters, crop production parameters, and other variable parameters are used in the models. The environmental effects are analyzed for several accident start times during the year. Several remedial actions are considered

[en] An exact solution of the relativistic equation of motion of a charged particle driven by an elliptically polarized electromagnetic wave has been obtained. The method employed for this purpose is simple, and the results of earlier authors for the linearly and circularly polarized waves, can be recovered as special cases of the solution. Solution of the relativistic equation of motion (REM) of a charged particle in an electromagnetic (EM) field is of fundamental importance having applications in many areas such as plasma physics and particle acceleration

No abstract available

[en] The Superconducting Super Collider Laboratory (SSCL) will have many subsystems that will require real-time microprocessor control. Examples of such sub-systems requiring real-time controls are power supply ramp generators and quench protection monitors for the superconducting magnets. We plan on using a commercial multitasking real-time kernel in these systems. These kernels must perform in a consistent, reliable and efficient manner. Actual performance measurements have been conducted on four different kernels, all running on the same hardware platform. The measurements fall into two categories. Throughput measurements covering the ''non-real-time'' aspects of the kernel include process creation/termination times, interprocess communication facilities involving messages, semaphores and shared memory and memory allocation/deallocation. Measurements concentrating on real-time response are context switch times, interrupt latencies and interrupt task response. 6 refs., 2 tabs

[en] The ion source produces a 30 mA beam of 35 keV H^- ions for SSC accelerators. The beam is chopped at 10 Hz into pulses of 7 to 100 μsec. The ion source presents an opportunity to implement and exercise software tools and techniques which will be useful in future SSC control system. TACL, a software package from the Continuous Electron Beam Accelerator Facility, forms the core of the system. TACL controls several analog channels and monitors interlocks. Emittance measurement control is now under design. In addition to TACL, components of ISTK are also used to interactively acquire and display ion beam information. The integrated system, including VXI and CAMAC acquisition modules attached to a network of heterogeneous computers, is described. 5 refs., 2 figs

[en] The elliptic and triangular flow coefficients $v_2$ and $v_3$ of prompt ${\mathrm{D}}^{\mathrm{0}}$, ${\mathrm{D}}^{+}$, and ${\mathrm{D}}^{⁎+}$ mesons were measured at midrapidity ($|y|<0.8$) in Pb–Pb collisions at the centre-of-mass energy per nucleon pair of $\sqrt{s_{\mathrm{NN}}}=5.02\text{TeV}$ with the ALICE detector at the LHC. The D mesons were reconstructed via their hadronic decays in the transverse momentum interval $1<p_{\mathrm{T}}<36\text{GeV}/c$ in central (0–10%) and semi-central (30–50%) collisions. Compared to pions, protons, and $\mathrm{J}/\psi$ mesons, the average D-meson $v_{\mathrm{n}}$ harmonics are compatible within uncertainties with a mass hierarchy for $p_{\mathrm{T}}\lesssim 3\text{GeV}/c$, and are similar to those of charged pions for higher $p_{\mathrm{T}}$. The coupling of the charm quark to the light quarks in the underlying medium is further investigated with the application of the event-shape engineering (ESE) technique to the D-meson $v_2$ and $p_{\mathrm{T}}$-differential yields. The D-meson $v_2$ is correlated with average bulk elliptic flow in both central and semi-central collisions. Within the current precision, the ratios of per-event D-meson yields in the ESE-selected and unbiased samples are found to be compatible with unity. All the measurements are found to be reasonably well described by theoretical calculations including the effects of charm-quark transport and the recombination of charm quarks with light quarks in a hydrodynamically expanding medium.

[en] APPD, BARC has developed a 6MeV RF Linac. Various sub-system of the Linac are lab power supplies such as gun filament heating AC power supply, electromagnet power supply for energising the electromagnet of magnetron and high voltage power supply for gun modulators etc. All these power supplies are generally available with RS232 based control available on ASCII protocol. ASCII being a popular protocol is often preferred in lab instruments. But these power supplies when used for making an industrial Linacs, it is difficult to handle all the power supplies in remote control with remote control and full automation of the system. A brick type dual core CPU, dual Ethernet, inexpensive PLC is used for converting the ASCII commands into modbus TCP-IP commands. All the commands of the power supply are programmed into the PLC and the remote interface/master control of the power supply is provided through the Ethernet port of the PLC. This way the laboratory instrument’s short range slow communication interface is converted into a long range high speed communication interface with an industrial data communication protocol. The high speed communication on the control side of the PLC help in sharing the data arriving from various such sources with the master controller. This method is successfully used for the automatic control of the Linac from control room. (author)