slowed even more, with just 305 emigrating through March. Soviet officials cite several reasons for denying emigration visas. In theory, emigration is to effect "reunion of families" in Israel. In recent years the authorities have tightened up and made "insufficient degree of relationship" a major reason for refusal—as in the Tarnopolsky case, for instance. Other reasons cited include "possession of security clearance" (even for work done a decade or two ago and that western scientists would not consider security-related to begin with), military service, possession of an advanced degree, or a vague "it's not expedient at this time," or "the bad state of international relations now." Indeed, U.S. observers consider poor relations with the U.S. to be the major cause for the decline in emigration. In the meantime, Tarnopolsky has started a hunger strike in his jail cell to protest his arrest. CCS is encouraging U.S. scientists to express their concern, before the trial, in letters to Soviet officials, U.S. political leaders, and U.S. general and scientific media. The U.S. National Academy of Sciences is quietly taking up the case. And the American Chemical Society's Committee on International Activities has recommended sending a letter of concern to the Soviets. That letter is awaiting approval by the ACS Board. Richard Seltzer, Washington
Tables of chemical properties published Publication of the "National Bureau of Standards Tables of Chemical Thermodynamic Properties: Selections for Inorganic and d and C2 Organic Substances in SI Units" caps a 20-year effort that the participants describe as monumental. The volume is a modern version of NBS Circular 500 (published in 1952) and supersedes the eight parts of the NBS Technical Note 270 series that appeared between 1965 and 1981. The volume is being published as Supplement 2 to Volume 11 of the Journal of Physical & Chemical Reference Data, a joint publication of the American Chemical Society, the
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CIRCLE 46 ON READER SERVICE CARD May 16, 1983C&EN
47
Science
Labtech 70 The New Lab Micro That Really Measures Up! Advances in microcomputer technology have opened new doors to scientific research and engineering. Affordable new micro-based systems can free you from dependence upon shared computer systems, giving you back the control and immediate response you need. The catch? Finding a laboratory microcomputer that's not just affordable, but that is capable of the high speed data acqui sition, real-time monitoring and control, and number crunching power your research demands. That's why we built Labtech 70— the first microcomputer system designed for research engineers by research engineers. We've taken the most advanced VLSI technology and com bined it with our experience in chemistry, physics, engineering and other analytical sciences. The result? Take a look at how Labtech 70 and some of our competitors measure up: LABTECH 70
IBM INSTRUMENTS 9000
DECMING-23 (RSX-11M)
1 Analog Data Acquisition Speed (12 bit conversions)
357,000 rps*
30 rps
16,110rps
Real-Time Multitasking I Ability
64K Tasks
7 Tasks
64Κ Tasks
I Standard System Languages
FORTRAN 77
BASIC
BASIC
Floating Point Hardware
Yes (80 bit)
No
Yes (64 bit)
Multi-User Ability
Yes
No
Yes
Curve fitting, Non linear regression, Graphics, Networking
None
None
Networking
Any ASCII compatible computer
ASCII networking promised
DEC computers only
Standard Winchester
Yes
No
No
Menu-Driven Software Included in I Basic System
I
* Readings per second.
In addition to designing Labtech 70 as a powerhouse of perform ance, we've kept it accessible and adaptable—with hardware and software you can get into, understand, and modify. The conclusion? If you're serious about putting computer technol ogy to work in your laboratory, there's no better system than Labtech 70. Call us at (617)497-1010 for details or to schedule a Labtech 70 demonstration. Laboratory .. -— Technologies Corporation, 328 Broadway, Cambridge, ι Massachusetts 02139. ί LABORATORY TECHNOLOGIES CORPORATION CIRCLE 21 ON READER SERVICE CARD 48
May 16, 1983 C&EN
American Institute of Physics, and NBS. It is available for $40 from the Books & Journals Division, American Chemical Society, 1155—16th St., N.W., Washington, D.C. 20036. Contained in the volume are 26,000 values for the chemical ther modynamic properties of 14,300 substances, counting each substance in each phase and each concentration listed for a solution. NBS estimates that the tables are based on 60,000 references. The tables contain, when available, values of the enthalpy of formation and Gibbs energy of formation, and heat capacity at 298.15 Κ (25 °C), the enthalpy difference between 298.15 Κ and 0 K, and the enthalpy of for mation at 0 Κ for the elements, inor ganic substances, and some organic substances. Aqueous solutions and some solutions in other solvents are included, but metal alloys and other solid solutions are not. Values in the tables are given in SI units and refer to a standard state of 298.15 Κ and 100,000 pascals (1 bar). The NBS Technical Note 270 series used the calorie (4184 joules) and the standard state of 298.15 Κ and 1 atm (101,325 pascals). Additionally in the new publication, accumulated errata have been corrected. And a limited number of values have been updated, primarily those of the gaseous ions. Properties covered allow calcula tion of the equilibrium constant and change in enthalpy, entropy, or heat capacity for any process for which the reactants and products can be found in the tables—regardless of whether the reaction actually has been carried out experimentally. The values listed are thermodynamically compatible. D
Group issues guidelines for ethics in research "Fraudulent research strikes at the heart of the scientific enterprise/' said the Association of American Universities in issuing its recom mended guidelines for integrity of research (C&EN, May 2, page 36). Universities seeking ways to prevent fraudulent research, it said, should adopt policies and sanations to en courage intellectual honesty.
