Concurrent constructs

The tricyclic core (164) has been prepared by a number of different routes, most commonly by a Diels-Alder reaction. Three approaches to the Diels-Alder have been followed. Pandit, at the University of Amsterdam, first prepared the tricyclic core (132, 133) focusing on the concurrent construction of the C(6)-C(7) and C(5)-C(10) bonds via an intramoleculer Diels-Alder reaction (Scheme 11). The stereochemical preference for 168 results from an unfavorable interaction of the alkoxymethylene (R in 168) with the dienophile, leading to a 3.5 1 mixture in favor of the desired diastereomer 168 (134). 

Park, M. 2001. Dynamic Planning and Control Methodology for Large-Scale Concurrent Construction Projects. Ph.D. dissertation, Massachusetts Institute of Technology, Cambridge. 

One of the most important achievements of Ada 2005 is the standardization of the Ravenscar restricted tasking profile. This profile defines a subset of the tasking features of Ada which is amenable to static analysis for high integrity system certification, and that can be supported by a small, reliable run-time system. This profile is founded on state-of-the-art, deterministic concurrency constructs that are adequate for constructing most types of real-time software. 

Siva Kumar, K., Mahesh Kumar, R, Sreenivasa Rao, V., Jafar, A. A., Meda, C. L. T, Kapavarapu, R., Parsa, K. V. L., Pal, M. (2012). A new cascade reaction concurrent construction of six and five membered rings leading to novel fused quinazolinones. Organic Biomolecular Chemistry, 10, 3098-3103. 

Sequential constructs enable the designer to describe the behaviour of the systems without specifying exactly the logic and interconnect required to achieve it. This is in contrast to the concurrent constructs, which go further down the path of describing discrete logic elements or modules with a clearer (if not fully defined) imderstanding of the physical circuit itself. 

A component specification has been written. It may come from requirements analysis (see Pattern 15.7, Construct a System Behavior Spec) or may be a part of the design of something larger (see Pattern 16.3, Reifying Major Concurrent Use Cases). 

Practical guidelines on how to deal with concurrency in a design—covering issues of interference (safety) and cooperation (liveness)—and higher-level concurrency design constructs are included in [Lea96],... 

Concurrent with the beginning of construction of the baseline incineration facility at JACADS in 1987, the Army requested that the National Research Council (NRC) review and evaluate the Chemical Stockpile Disposal Program (CSDP) and provide scientific and technical advice and counsel. The NRC established the standing Committee on Review and Evaluation of the Army Chemical Stockpile Disposal Program (Stockpile Committee), one of whose early reports was a study of operational verification testing at JACADS prior to the start of agent disposal operations. In the intervening years, the Stockpile Committee produced 27 reports on various aspects of the CSDP. ... 

In practice, of course, it is rare that the catalytic reactor employed for a particular process operates isothermally. More often than not, heat is generated by exothermic reactions (or absorbed by endothermic reactions) within the reactor. Consequently, it is necessary to consider what effect non-isothermal conditions have on catalytic selectivity. The influence which the simultaneous transfer of heat and mass has on the selectivity of catalytic reactions can be assessed from a mathematical model in which diffusion and chemical reactions of each component within the porous catalyst are represented by differential equations and in which heat released or absorbed by reaction is described by a heat balance equation. The boundary conditions ascribed to the problem depend on whether interparticle heat and mass transfer are considered important. To illustrate how the model is constructed, the case of two concurrent first-order reactions is considered. As pointed out in the last section, if conditions were isothermal, selectivity would not be affected by any change in diffusivity within the catalyst pellet. However, non-isothermal conditions do affect selectivity even when both competing reactions are of the same kinetic order. The conservation equations for each component are described by... 

T0176 Concurrent Technologies Corporation, Acid Extraction Treatment System (AETS) T0178 Constructed Wetlands—General... 

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