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Composite complete-incomplete (C-I) block designs are formed by combining complete blocks of size t units with balanced incomplete blocks of k units (1 ≤ k < t) resulting in blocks of size t+k units. In sensory experiments, composite C-I block designs have been shown to be more efficient than the standard complete block designs. Replication of the blocks in these C-I block designs permits accurate interpretation of panelist X treatment interaction effects. Also, the formulae for calculating estimates of the treatments, panelists, and interaction effects are simpler in form with the replicated C-I designs than the corresponding formulae with the unreplicated C-I block designs. The analysis of an experiment involving the rating of flavor of three strawberry preserves using a replicated C-I block design is presented.

The techniques of structured programming are usually described using an ALGOL‐like language, see for example Dijkstra's ‘Notes on Structured Programming’. Many programmers regard the availability of a structured language essential for any practical structured programming. However, within this definition of structured programming, Wirth recognizes that the techniques can exist in much less favourable environments. BASIC is indeed an unfavourable environment for the practitioner of structural programming. The weakness of the subroutine facility conspires with the dominant GOTO. The average BASIC program is a mess. In teaching students and staff to use BASIC in the Computational Physics Teaching Laboratory at the University of Surrey we have tried to encourage a structured approach. The sub‐routine as a building block is strongly emphasized. We have abandoned the old notion of the subroutine as a handy package for an often used section of code. Flow charts are replaced by a mixture of plain English and ALGOL...

The problem of determining material requirements is an important one in any integrated manufacturing organization. This paper presents an approach to the computer calculation of material requirements and balances. The approach is particularly useful in planning applications where it is desired to evaluate numerous alternatives. It also forms a means of generating matrices for linear programming optimizations. The approach identifies particular types of calculations which can be written as subroutines in a computer program. Each subroutine can be represented by a particular name and symbol, thus becoming a module which can be used as a building block in a material balance calculation system. To model a particular material flow complex, an information flow diagram is drawn in which each calculation module is represented by a block. Directed lines connecting the blocks represent streams of information flow. The information flow diagram can be readily coded for computer case-study simulations using a unique application-oriented language.

The nature of two-electron integral transformations as a major stumbling block to configuration interaction calculations is discussed. An N5 general procedure utilizing positional algorithms for all members of specially ordered lists of partial summations is presented. Theoretical analysis detailing sequencing and calculational algorithms is included, augmented by results of FORTRAN programmed versions of the method. Two program versions differing in the manner of dividing the partially summed integrals into blocks give practical orders N 5 .5±0.2 and N 6.23±0.05 , the former approaching theoretical order.

A new role for concrete blocks in rationalised construction is envisaged by the National Concrete Masonry Association of America as a result of the development of new mortars and prefabricated block wall panels. These developments are described by the Vice-President, Technical Services, of NCMA.

A Markov chain model of a multi-row machine for automatically inspecting and planting soil blocks in which a seedling may have been established is described. The resultant system of linear equations can easily be solved and allow the performance characteristics of a proposed machine to be determined for different rates of germination without an actual machine having to be built and tested. For example if a satisfactory likelihood of not having a seedling available for planting is 1 in 10 000, with a five-row machine, an inspection rate of 7 soil blocks between each planting and a buffer size of 20 seedlings then the minimum proportion of soil blocks accepted must be 0·76. If the inspection rate is decreased to 6 the minimum proportion of acceptable blocks is 0·865.

In this paper, a mathematical theory of instruction applicable in the educational environment is developed from concepts of psychological learning theory. Within the framework of optimization and control theory, the dynamics of the interaction between instructor and learner are modelled, and the trade-off between instruction cost and learner achievement is formulated so that optimal instruction inputs can be determined. One important aspect of the classroom environment that is characterized by the theory is the interaction between an instructor and a group of learners with various learning abilities. A basic dynamic model that relates learner achievement and instruction cost is developed from learning theory concepts. This model, which applies to the individual learner situation, is analyzed in detail to determine instruction intensity inputs that match the learner's characteristics in order to maximize an objective that measures both achievement and cost. This basic model is used as a building block to describe how individual learner achievement depends on instruction pacing. To determine optimal instruction pacing the concept of gain, which is essentially learner achievement per unit time, is introduced. In this extended model, instruction pacing is intimately related with the concept of learner aptitude. This relationship leads immediately to the consideration of instruction pacing for a group of learners with various aptitudes and thus optimal instruction pacing is determined for nonhomogenous groups. Throughout the development of the theory, hypothetical examples are presented to demonstrate many of the implications of the theory. One of the contributions of the theory is the definition of the concepts of learner aptitude and instruction pacing within a framework that structures the empirical investigation of these concepts by means of experimental research.

The present paper envisages a generalized situation of the balanced incomplete block design in the sense of allowing for the sampling of sources of experimental material, of blocks within sources, of experimental units within blocks, and of treatments under consideration. A model for an arbitrary observation of a generalized balanced incomplete block design is derived explicitly from the physical way in which the experiment is performed, i.e., from the way in which the sampling and randomization procedures are carried out. The correlational structure of the observations is therefore implicit in the model. The model initially uses no assumptions of additivity of treatments with experimental material. It is shown that expected values of squares of partial observational means, as well as the expected values of products of individual observations, admit simple and easily specifiable expressions in terms of quantities called cap sigmas and denoted by $\Sigma$'s. The expected values of mean squares in the analysis of variance table are then derived. Consequences of the presence of various types of nonadditivity on the usual test of no treatment effects are discussed for fixed, mixed and random situations. For example, when the blocks actually used in the experiment form a random sample from an infinite population of blocks then the presence of interactions of blocks with treatments produces no bias in the comparison of the error and adjusted treatment mean squares. The correlational structure of the observations under the simplifying additivity assumption is examined for the standard balanced incomplete block design. It is shown that the usual forms of estimators of treatment comparisons are appropriate and that the $\Sigma$'s play the roles which the block and plot variances have in the corresponding assumed infinite model. In the presence of nonadditivities of treatments with the experimental material the usual forms of the linear estimators are no longer best.

Using the method involving primary heating and cooling of large blocks of refractory concrete, that is, by measuring the pressure of the steam in the concrete and the deformation of the block surface, it is possible to experimentally establish the drying and cooling cycle for blocks of different construction and made from different materials.

The treatment of a group of 14 patients of differing diagnostic categories, all of whom had achieved professional status in the graphic or performing arts and who had been blocked from pursuing their creative activity, is examined. The change in all cases from nonproductivity to productivity, as charted, is presumptive evidence to support the application of combined psychotherapeutic techniques—supportive, directive and analytic in nature. Descriptions of the specific aspects and application of these techniques in this type of patient are detailed. They are all introduced to indicate the value of their combined use in the therapeutic management of the artist patient who is blocked in pursuing creative work. It is felt by the writer that the very nature of the therapist's flexible application of a variety of psychotherapeutic techniques in the patient who is a creative artist will liberate this patient from his inhibition.

To test the concept of middleness, 4 series of 7 problems each consisting of 3, 5, 7, 9, 11, 13, and 15 blocks were administered to 402 male and 381 female children between the ages of 36 and 155 mo. The task required S to select the middle block and the results showed that this ability began to emerge at the 3-yr. level, developed rapidly through year 6, and became asymptotic by the eighth year. A wide variance in the ability was exhibited but perfect performance on all of the problems was not found until age 13½. The use of the task as a test of cognitive development is discussed as well as alternate variations involving blocks of different colors, asymmetrical arrangements, paper-and-pencil forms, and verbal reinforcement.

The array of numbers which represent the treatment combinations of factorial arrangements are utilized to construct balanced incomplete block designs and partially balanced incomplete block designs with two associate classes. A systematic procedure of selecting portions of these arrays is presented. These partial arrays lead to the construction of various incomplete block designs when the columns of the array denote the blocks (treatments), the rows of the array denote the treatments (blocks), and the presence of a specific number in a particular column (row) denotes the presence of a treatment in the block which that column (row) represents.

1. Pipe network concrete-cooling systems for massive structures with a columnar block system can and should be used on a composite basis, i.e., not only for cooling concrete so as to create favorable conditions for joint grouting but also for relieving the thermal-stress condition of the blocks. This allows concreting of structures in blocks of great height. 2. The following conditions are essential for ensuring a successful composite utilization of the cooling system: a) The arrangement of the cooling-system components should be such that the communications necessary for the cooling operation can be prepared in advance, before placing concrete. b) The cooling system must be supplied by permanent pumping stations having a large power reserve, equipped with a reliable water intake, and located at sites which are convenient for effecting repairs and replacing plant units; in selecting the capacity of the pumps the water requirements to meet other technological needs should be taken into account. c) The clearance diagrams and the layouts of galleries and other cavities in the dam body should be fixed with due allowance for laying cooling-system communications therein; it is desirable to provide special galleries for geodetic observations. d) The nets and their connections should be of such construction as will ensure they can be safely laid during concreting of the blocks. 3. Where climatic conditions resemble those for the Krasnoyarsk hydroelectric station, cooling can be successfully accomplished with river water at natural temperature. 4. It is expedient to effect regulation of the cooling process, not by regulating the water discharge through the units, but by stage-by-stage hooking-up and disconnection of the supply therto.

Synopsis Although the use of loose fibre-board caps with single blocks may increase the variation within a set of results when compared with mortar capping, the amount will depend largely upon the skill and experience of the mortar-capping operative. From an economic viewpoint, the board-capped single block specimen offers several advantages, and the sample size may be adjusted to give the required level of accuracy to the determination of block strength. The relationship between the results of tests on mortar- and board-capped specimens may be calculated, and both forms of test related directly to the performance of concrete block work walls.

—Successful design and manufacture of future digital systems will depend upon the availability of a suitable design language. A precise, concise language is presented which facilitates the specification of complex digital systems. The language 1) is independent of any particular technology, design procedure, machine organization, etc., 2) allows specification at different levels of detail from architecture to detailed Boolean equations, and 3) may be com- piled into manufacturing information. Its syntax and semantics per- mit documents with an organization which parallels the block struc- ture of the systems they specify.

Schemes illustrating the principal of isostasy usually neglect the problem of stability of equilibrium within individual crustal blocks. Block diagrams have the advantage of suggesting experimental verifications and calculations. Readjustments within blocks--such as those resulting from an oblique major fault--would cause relative changes of level within a floating block of uniform density. This complementary aspect of isostasy should be taken into account in geotectonic theories.

15 brain-damaged and 9 non-brain-damaged retarded Ss were given the following visual-motor tasks: (a) the WISC Block Design subtest, (b) the WISC Block Design multiple-choice procedure presented by Birch and his associates, and (c) the MPD circle-diamond figures, incorporating pencil and block procedures. A combination of the Block Design subtest and the circle-diamond figures was successful in indicating Ss with execution (motor) or integrative dysfunctions. The multiple-choice procedure proved invalid as a technique for differentiating Ss with executive or integrative dysfunctions from Ss with visual perceptual difficulties. The results argue against the commonly held notion that perception is a unitary process. Rather, the findings suggest that failures on visual-motor tasks by mentally retarded Ss result primarily from faulty executive or integrative components.

Blocks have for so long been considered toys that schools have been slow to introduce them as a regular part of the equipment. As long as the first grade was viewed almost entirely as a place to acquire the three R's and the kindergarten largely as a preparatory extension of Grade I, block play was, of course, unnecessary if not actually out of place. In Table i are listed many of the goals which are now advanced for the earliest levels by experts in child development and by agencies specializing in the preparation of teachers and the education of parents. Even a cursory reading of this list should suffice to show that present-day goals for the three earliest levels are almost entirely nonacademic.

In 1943 Wald [2] gave a method for constructing tolerance regions in the multivariate case. Tukey generalized Wald's procedure in [4] and the results were interpreted for discontinuous distributions in [5] and [6]. This paper presents a further generalization of the method so that statistically equivalent blocks can be determined sequentially; the particular function used to cut off a block may depend on the shape or structure of previously selected blocks. The results are also interpreted for the case of discontinuous distributions. Possible advantages of applying the method are discussed.

Identification of the information‐bearing elements of speech is important in applying recent thinking on information theory to speech communication. One way to study this problem is to select groups of building blocks and use them to form standardized speech which then may be evaluated; a method having the advantage of simplicity is described. Individual recordings of the building blocks were made on magnetic tape and then various pieces of tape were joined together to form words. Experiments indicated that speech based upon one building block for each vowel and consonant not only sounds unnatural but is mostly unintelligible because the influences on vowel and consonants are missing which ordinarily occur between adjacent speech sounds. To synthesize speech with reasonable naturalness, the influence factor should be included. Here these influences can be approximated by employing more than one building block to represent each linguistic element and by selecting these blocks properly, taking into account the spectral characteristics of adjacent sounds so as to approximate the time pattern of the formant structure occurring in ordinary speech. There is no a priori method of determining how many building blocks are required to produce intelligible standardized speech. This can only be determined from experiments involving listening tests. Such tests are described.

The extensible data facilities of OSL/2, an operating system language, are described. These facilities allow one to create new data types, such as queues, files, and tables, and describe complex access algorithms for these new types. When used in operating system codes, data type extension facilities help the programmer isolate macro and micro levels of complex data manipulation and provide logical places to insert and remove system measurement code. The implementation of these facilities is compatible with existing block structured languages like ALGOL 60 and PL/1 and can be accomplished in a straightforward manner.

This paper describes a computer system which uses a combination of coordinate indexing and structure matching techniques to extract from English questions many criteria which can be used for selecting and recognizing answers. A complete index of all content words in text is first searched to find information-rich statements which may be answers to the question. Each of these statements is then dependency analyzed to determine if the words (or synonyms) which correspond to question words maintain the dependency relations holding in the question. A simple semantic evaluation of structurally acceptable answers follows. A human editor working with the computer system helps to resolve syntactic ambiguities which are otherwise a major stumbling block in question-answering systems.

This discussion of the McCauley Test is presented primarily because of the bearing of an analysis of the test upon the design of other tests. From this analysis certain principles are deducible which should be of value to all who undertake the construction of similar tests. The results indicate that it does not follow that a test should be sum marily discarded because it does not meet the usual criteria of reliability and validity. Often the attempt to measure the test against the criteria will reveal difficulties in the way of obtaining higher values and indicate the modifications that should be made in design, administration, and interpretation. The test, as originally designed by Mr. W. J. McCauley1 of the University of Arizona, consists of six right tetrahedrons. These were cut from a block of wood i//xi^2,,x2^2// by sawing through the diag onally opposite sets of edges, making three separate cuts with the saw. Each student was given a set of the six blocks numbered from one to six and a set of 144 drawings showing every possible position these blocks could oc cupy relative to the planes of projection, each drawing showing three views of a block in orthographic projection. The task of the examinee was to choose the block represented in each drawing, covering as many drawings as possible in a given length of time.

This paper presents a decomposition procedure for extending the size of problems that can be solved using dynamic programming. It essentially consists of decomposing the tabular arrays of data into blocks of data, and then performing the dynamic programming calculations over the whole tabular array by calculating on each block separately.

Nonparametric tolerance regions can be constructed from statistically equivalent blocks using published graphs by Murphy [8]. In this paper the procedure for obtaining the statistically equivalent blocks is generalized. The $n$ `cuts' used to form the $n + 1$ blocks need not cut off one block at a time, but at each stage may cut off a group of blocks, the group to be further divided at a later stage by a different type of cut in general. An example is given which indicates possible applications. The results are also interpreted for discontinuous distributions by indicating the necessary modifications to the corresponding theorem in [7].

This is a discussion of a method of instruction designed to replace conventional methods for training radio repairmen. In traditional radio repair instruction, basic electronics has been taught as a block of instruction preceding instruction on intact equipment and maintenance operations. This approach is criticized for its failure to provide the student with meaningful and relevant contexts for the learning of basic electronics and for the obstacles it presents to the assimilation of basic electronics knowledge into maintenance skills. A new approach, entitled the functional context method, is offered as a means for avoiding these shortcomings. This is accomplished through a topic sequence wherein basic electronics is taught in the broader contexts of over-all equipment functions and maintenance operations.

SUMMARY An incomplete split plot design with whole plots arranged in a completely randomized design was proposed by Robinson (1967). In this note, designs in which the whole plots are arranged in blocks, are considered. A method of construction and estimates of treatment effects are given. Robinson (1967) discussed certain incomplete split plot designs for factorial experiments with a factor A1 on whole plots and a factor A2 on subplots. In these designs the number of subplots per whole plot is less than the number of levels of A2. For each level of A1, the allocation of levels of A2 is balanced with respect to whole plots in the sense that, if whole plots are thought of as blocks, the allocation produces a balanced incomplete block design. The same balanced incomplete block design is used for each level of A1. Robinson (1967) did not consider grouping whole plots into blocks. However, the incomplete split plot design for the treatment combinations of two factors A1 and A2 at v1 and v2 levels, respectively, consists of whole plots made up of k2 < v2 subplots, with each level of the factor A1 applied to b2 whole plots and the v2 levels of the factor A2 arranged in a balanced incomplete block design within each level of A1 by considering the whole plots as blocks. On any level of A1, each level of A2 occurs r2 times and each pair of levels of A2 occurs in the same whole plot A' times. The design may be considered to be repeated r, times. If the whole plots are arranged in blocks, the between whole plot error may be reduced. A procedure, based on designs for confounding in asymmetrical factorial experiments as described by Nair & Rao (1948), is suggested for generating these designs. Neglecting the whole plots, we see that the block designs derived by this procedure are partially balanced incomplete block designs with three associate classes in a rectangular association scheme and they give a generalization of the direct product designs of Vartak (1955, 1959). Rees (1969) considered incomplete split plot designs where the blocks were direct product designs.

Laboratory and theoretical investigations into the effect on compressive strength of the three dimensions of rectangular blocks of coal crushed parallel to the bedding planes are described. The mean compressive strength is shown to be related to all three dimensions of the rectangular block and a relation is given for the probability of survival of rectangular blocks of two different dimensions at a given stress. It is shown that the strength cannot be treated as a simple problem of the distribution of weakest values and a simple model is suggested, consisting of an assembly of parallel meshes, which predicts approximately the strength-size effects.

This paper describes an integrated set of five computer programs designed for the aerotriangulation of a block of photographs. The first program corrects the observed image coordinates for several systematic errors. The second program performs the strip triangulation using sequential independent models. The third and fourth programs carry out the strip transformation and strip adjustment respectively. The fifth, and last, program executes a block adjustment. All programs are coded in FORTRAN IV and are operational on the I.B.M. 7090/7094 and other comparable computer systems using FORTRAN IV.

The l-2 control terminal which is described in this paper, is a basic element in a complete ?package? radio system. The system design is building block in nature with only a few building blocks required for a complete operating system that is devoid of frequently unnecessary embellishments. However, additional panels are available where more than the basic functions are required.

A choice in the subdivision of the earth into approximately equal area blocks is considered. Criteria are discussed for judging the value of various types of block divisions. The three divisions considered in this paper are: 1) a generalized division valid for any size block; 2) and 3) a division of a 30° block and the Zhonogolovich 10° blocks so that the sub-blocks may be conveniently meaned to form blocks in sizes up to 30° and 10° respectively.

THE purpose of this paper is to show how the method and principles of the randomized block, so successfully used by agronomists in field plot experiments, may be adapted to animal nutrition experiments, and to indicate a few of the possible applications of covariance analysis. In the randomized-block agronomic experiment the land to be used is divided into a number of blocks which in turn are subdivided into small plots of the same shape and of equal size. The plant varieties, or fertilizer treatments, to be compared are distributed at random among the plots with the restriction that each variety, or treatment, shall occur once, and only once, in any block. The blocks need not be alike so far as the soil is concerned; however, they are made small enough so that the individual plots in any given block are not greatly different. The number of plots in a block . . .

The purpose of this note is to characterize "block-graphs", a collection of graphs defined by a construction involving certain subgraphs called "blocks". A related operation on a graph leads to the study of "cut-point-graphs". The precise relationship between these two operations is made explicit. In order that this characterization be self-contained, we include the necessary definitions.

An experimental revetment of specially designed cellular concrete revetment blocks was constructed on an eroding streambank in western New York. Over a period of 8 yr the 4-in. thick revetment has given satisfactory performance under severe conditions. In contrast, an adjacent revetment of quarried stone riprap has been less effective in withstanding the erosive forces. Square holes run entirely through the depth of the block. These holes serve several purposes: They mechanically hold gravel and crushed stone in place, thus reducing the erosive forces at the surface of the bank; allow planting of vegatative materials on the bank; and reduce the block weight making handling easier. When the blocks are mass-produced and where quarried stone is available locally, the costs of the types of revetments would be approximately the same.

In order to properly implement block form stability, thorough diagnostic and clinical skills are mandatory. In some instances, modification of existing crown morphology is sufficient. At other times extensive restorative procedures are needed. All must be based upon interdisciplinary knowledge. Crown morphology must be considered when the removable prosthesis is in position.

The critical conditions at which buoyant blocks on a flowing stream are swept under a downstream floating cover are investigated analytically and experimentally. The mathematical model of block stability is based on a one-dimensional hydrodynamic analysis of the flow passing beneath the upstream end of a floating cover, and the force and moment equilibrium of the block. It is argued that the condition of incipient submergence is reached when the block sinks and rotates until the stagnation water surface elevation equals that of the top upstream edge of the block. Experiments to verify the analysis were conducted in a 1-ft wide laboratory flume using right parallelpiped blocks with three different specific gravities and a range of length-thickness ratios. The moment coefficient which arises in the analysis was evaluated by means of the experimental data, which were found to be in good agreement with the analytical results.

The U.S. Coast and Geodetic Survey has had an analytic system of aerotriangulation in routine production since 1961. Last year, the Bureau began the rewriting of its computer programs for analytic aerotriangulation in order to increase their efficiency and eliminate the need for human intervention during the computing phase. At the same time, the Bureau decided to publish the programs in the FORTRAN language for the purpose of expediting the application by others in the photogrammetric community of analytical aerotriangulation methods. On completion these programs will include: systematic correction of observed image coordinates, three-photo orientation, horizontal and vertical strip adjustment, and block adjustment. Except for the present block-adjustment program, which is now under review, all of the programs have been rewritten and placed in operation. The three-photo orientation program lies at the heart of the current analytic solution. The purpose of this paper is to report in detail on the mathematical concepts and computer programming techniques employed in this particular program phase.

Given an n-port of nullity q, the Z-matrix of which is to be sought, we first construct a primitive Z-matrix of order q, and then apply to it the pivotal condensations with respect to q–n unspecified ports, one at a time. The present note discusses the problem of decomposing a network into blocks and then of seeking a port structure so that any pair of unspecified ports taken from different blocks have no coupling in the primitive Z-matrix. This enables us to apply a block-pivoted condensation to the primitive Z-matrix.

be used as a measuring device to evaluate constructive and manipulative ability of children of nursery school and kindergarten ages. Block constructions were selected as the best approach to the problem; they provide a situation which the child can initiate himself and also one at which he can work alone or with other children. A scale of block constructions would, then, make possible study and investigation into phases of child development which heretofore have been neglected because of the lack of an adequate measuring device which would give objective, quantitative results.

A set of subroutines for use in FORTRAN are described whose purpose is to synthesize output strings from (i) input strings which have been analysed by the SHADOW general syntactic analysis subroutine reported earlier, and/or (ii) packed BCD strings formed in any way. Function-type subroutines are included for intermediate manipulations, which are performed on the strings which are stored in an abbreviated internal representation. The automatic way in which an internal representation for each newly created substring is stored sequentially in a block of common storage, and the manner in which a storage block is dynamically allocated for that purpose, are discussed.

The status of microminiaturization is summarized under the following three headings: 1) assembly of pretested conventional or specially designed component parts, 2) printing or vapor deposition of multicomponent assemblies on fiat insulating substrates, and 3) preparation of complete circuits from a solid block of semiconductor material. Under the first heading, assembly of parts in three-dimensional (3-D) soldered structures, in 3-D welded structures, in imitation 2-D-type structures, and in structures of disciplined geometry is briefly described. The latter structures now include not only the Micro-module but also new pelletized parts. Under the second heading, the original 2-D thin-film type of construction is briefly summarized and then the evolution of this system into experimental circuits containing all thin-film passive parts is shown. The logical next step, preparation of circuits conraining thin-film active as well as passive parts, is in even earlier stages of research. Under the third heading, new developments in integrated and functional circuits are presented. The trend of current work points to the conclusion that equipment available commercially in the next decade will probably take the form of hybrid structures comprising both individually fabricated parts, and single-process parts arrays, all mounted or processed onto an insulating substrate.

1. When cooling a block with plan dimensions L≤15 m, by 25°C in relation to the base block, the tensile stresses in the contact zone will not exceed the maximum permissible values. 2. The temperature regime of blocks, poured on a cold base, should be designated by taking into account the temperature condition of the 0.2–0.3L thick base layer. Classification of concrete bases, as used in practice, by their age: “fresh”—to one month, and “old”—over one month, is considered as an entirely inadequate characteristic of the base temperature condition. 3. In case of interruption of pouring two adjacent blocks up to three months, it is proper to limit the value of exothermic heating depending on the age of the base block. If the interruption lasts more than three months, the values of maximum temperatures can be limited for various periods of the year depending on the temperature of the base.

This project consists of seven blocks, each 12 storeys high. They have a common set of services, including central heating, parking, domestic aids, washing installations, snack bar, a pharmacy and a children's nursery. The ground floor of each block has shops, the main and the service vestibules, n porter's room, storage for parambulators, and refuse storage space. The first floor of each block is devoted to apartments, and the rest of the floors to flats. The project is so well planned and so constructed that it can be cited as an example of small sized flats organised in a large set of blocks.El edificio está formado por siete unidades o casas de 12 plantas, con servicios comunes a todas ellas: central de calor; aparcamiento; auxiliaría doméstica; lavandería; snack-bar; farmacia y guardería. La planta baja de cada unidad aloja: las tiendas; los vestíbulos —principal y de servicio—; portería; cuartos para coches-niños; cuarto de basuras; etc. La planta 1. está destinada a apartamentos, y las restantes se dedican a viviendas. El acierto logrado en su diseño determina el que pueda presentarse este edificio como ejemplo de realización destinada a viviendas pequeñas.

Much work has been done towards characterizing the semantics of block structured programming languages using the lambda calculus [ 2 ] . Johnston [ 3 ] recently introduced a cell-based approach, called the contour model, for specifying the execution semantics of such languages. This paper relates the two approaches by giving a contour model evaluator for compiled lambda expressions. Section 2 gives the basic definitions needed from the lambda calculus to make the paper self-contained. Section 3 defines the Contour Model Lambda Calculus Machine (CMLCM). Unfortunately publication limitations preclude some worked examples which would greatly aid the reader's understanding. They will be provided in the talk itself and in an expanded version of this paper for the Tutorial Conference on Semantic Models of Computation. Section 4 outlines the structure of the proof of the CMLCM's correctness. And Section 5 is a set of concluding remarks on the significance of the CMLCM.

Introduction and Summary A good amount of work has been done on the construction of balanced incomplete block (B.I.B.) designs by Bose (1939, 1942), Sprott (1954, 1956), Rao (1961), Takeuchi (1962) and others. Sprott (1954, 1956) obtained several series of B.I.B. designs through difference sets. The main purpose of the present investigation is to provide two methods of construction of B.I.B. designs obtainable through more than one initial block. The first method derives initial blocks of a series of designs from some specified blocks of a B.I.B. design obtainable by developing one or more initial blocks. The second method attempts to obtain one of the initial blocks (the basic initial block) through the different powers of an element of a finite field; then an appropriate method for generating the other initial blocks from it is discussed. A table showing the basic initial block for different designs has been presented. By these methods several solutions of some B.I.B. designs could be obtained from different initial blocks. An examination was therefore made to see if these designs were all isomorphic.

In experimental designs the quantities investigated are often grouped into blocks as a method of obtaining a higher precision for the experiment. This grouping may result in high correlation among observations within the same block. If the positions of the treatments within a block are assigned at random, the amount of correlation is difficult to determine and may vary greatly between treatments and from block to block. Also for many experiments the variances of the observations may differ substantially between treatments and from block to block. When one or both of these complications arise, the t-statistic is not necessarily applicable for comparing the effects of the treatments under investigation. This paper presents some nonparametric tests of Student's hypothesis which are usually valid for a well-known type of experimental design if there is statistical independence among blocks (number of blocks ≧4). These nonparametric results are reasonably efficient (compared to those based on the t-st...

Publisher Summary This chapter focuses on TIDE, a commercial compiler for the IBM 650. TIDE gives a programmer the opportunity to secure all the advantages of instruction modification without the following: (1) Random modification, where a transfer is required from/to a location not known at the beginning of a program; and (2) Sequential modification that occurs where the difficulties of looping are avoided by giving addresses a block significance. This instruction will take the 44 factors beginning in FACTR, multiply each in turn by the single increment in INCRT and store the answers back in the original 44 factor positions. The programs produced by TIDE are a collection of well-tried devices. Because the compiler cannot take a wider view of the program than each individual device, it will produce a program less sophisticated than one by a good programmer writing in basic 650 code.

The spillway of the Wanapum dam, on the Columbia (U. S. A.), includes 12 sector gates, designed by the Harza Engineering Company Each gate closes an opening of 15 x 20 m. The hinges of the gates are supported by reinforced concrete blocks, suitably anchored on the top side of the dam, by means of 14 cables, each made up of 90 wires of 6.35 mm diameter. This avoids the use of heavy metal structures, normally necessary to withstand the thrust of the gates. The anchorage blocks and the main supporting piles contain grooves, into which the gate hinges, one on each side of each anchorage block, are located. The determination of the three dimensional stress distribution in these anchorage blocks was carried out on reduced scale models, in which aluminium was used. Other models were studied by photoelastic methods. These analyses enabled to decide the best shape and internal distributed of the reinforcement. The disparity between the results obtained on the aluminium models and in the photoelasticity investigations were negligeable., El aliviadero de superficie de la presa Wanapum, sobre el río Columbia (Estados Unidos), se compone de doce compuertas de sector, proyectadas por la casa Harza Engineering Company, cerrando cada una un hueco de 15 X 20 metros. El muñón de estas compuertas se ha instalado delante de un bloque de hormigón armado—convenientemente anclado en el paramento de aguas arriba, con 14 cables de 90 alambres y 6,35 mm de diámetro, cada uno—, en el cuerpo de cada pila. Con ello se evita el empleo de pesadas estructuras metálicas para absorber el empuje de las compuertas. Entre el bloque de anclaje y el cuerpo de la pila se ha dejado una estrangulación en el hormigón, de 1,20 m de espesor, que tiene por objeto dejar espacio libre para la colocación del muñón de cada una de las dos compuertas adyacentes a la pila. La determinación del estado tensional en tres dimensiones se llevó a cabo realizando ensayos sobre modelos reducidos de aluminio y ensayos fotoelásticos, a partir de cuyos resultados se pudieron fijar las bases que servirían para el dimensionado, forma y disposición del bloque de anclaje y cables del pretensado. La divergencia entre los resultados obtenidos con los modelos de aluminio y los procedimientos fotoelásticos fue de la menor cuantía.

This paper is a report on the further development of light-weight interlocking concrete block revetments through tests in the Large Wave Tank at Coastal Engineering Research Center. Two types of blocks were tested on a 1 on 2 slope; one a machine-produced tongue-and-groove type weighing 75 lb, and the other a hand-produced shiplap type weighing 150 lb, the latter having twice the surface area of the former. In all, ten tests were made with wave heights ranging from 1.5 ft to 6.2 ft and wave periods ranging from 3.0 sec to 6.0 sec. Observations were made of the displacement of blocks and the vertical movement of the face of the slope when attacked by waves. Test data have provided information resulting in the development of a machine-produced block which remained stable under the continuous attack of 4.7-sec 4.8-ft breaking waves. Comparative tests showed that the tongue-and-groove blocks have greater stability than the shiplap blocks.