Differential Method Of Analysis Research Articles

A differential method of analysis of steady-state space-charge-limited currents: An extension

physica status solidi (a)Volume 49, Issue 2 p. K149-K152 Short Note A differential method of analysis of steady-state space-charge-limited currents: An extension S. Nešpůrek, S. Nešpůrek Institute of Macromolecular Chemistry, Czechoslovak Academy of Sciences, Prague Search for more papers by this authorJ. Sworakowski, J. Sworakowski Institute of Organic and Physical Chemistry, Wrocław Technical University Search for more papers by this author S. Nešpůrek, S. Nešpůrek Institute of Macromolecular Chemistry, Czechoslovak Academy of Sciences, Prague Search for more papers by this authorJ. Sworakowski, J. Sworakowski Institute of Organic and Physical Chemistry, Wrocław Technical University Search for more papers by this author First published: 16 October 1978 https://doi.org/10.1002/pssa.2210490259Citations: 18 16206 Prague 6 - Petřiny, Czechoslovakia. Wybrezeze Wyspiañskiego 27, 50-370 Wrocław, Poland. AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat Citing Literature Volume49, Issue216 October 1978Pages K149-K152 RelatedInformation

A differential method of analysis of steady-state space-charge-limited current-voltage characteristics

A simple differential method is proposed of the analysis of space-charge-limited current-voltage characteristics. The method allows to estimate both depths and densities of traps from a single SCL current-voltage characteristic measured at a constant temperature. Eine einfache differentielle Methode zur Analyse der raumladungsbegrenzten Strom-Spannungs-Kennlinien wird vorgeschlagen. Die Methode ermöglicht die Bestimmung der Tiefe und der Konzentraction der Haftstellen mit Hilfe nur einer raumladungsbegrenzten Strom-Spannungs-charakteristik, die bei konstanter Temperatur aufgenommen wird.

Stress–strain behaviour of two compacted clays in tension and compression

Zones of total stress tension and steep stress gradient occur in soil structures such as multilayer pavements and earth dams, and direct tension tests and simple bending tests on soils could be used advantageously to investigate soil behaviour under these conditions. The Paper describes the observed behaviour in direct tension and bending of two clays compacted with standard Proctor effort at different moisture contents ranging from below to above optimum. The investigation is in terms of total stress and is concerned with both stress-strain behaviour and strength condition. It is shown that the elastic bending theory is not satisfactory for analysing bending in soils and an alternative differential method of analysis is used which does not require the assumption of any preferred stress- strain laws. The maximum tensile strains at failure are observed to increase with the increase of moulding moisture content irrespective of the type of test or the optimum moisture content. This supports the view that clays should be compacted at high moisture contents when considerable tensile deformation of a soil structure is expected. The values of both the initial tangent modulus and of the secant modulus (at maximum stress) for both clays are markedly greater in tension than in compression, and the relative values are influenced by the moulding moisture content. Thus the use of identical values for tension and compression in analysis of soil structure is not justified. Des zones de contrainte de tension totale et de gradient élevé se produisent dans des structures de sol telles que les multicouches et les barrages en terre. Des essais de tension directe et de simples essais de flexion sur les sols pourraient être utilisés avantageusement afin d'étudier le comportement du sol dans ces conditions. L'étude décrit le comportement observé dans une tension non drainée et une flexion de deux argiles compactées au Proctor standard à diverses teneurs en eau inférieures. et supérieures à l'optimum. L'étude est en termes de contraintes totales et elle est concernée par le comportement de contrainte de tension ainsi que par les conditions de résistance. II est montré que la théorie de la flexion élastique n'est pas satisfaisante pour analyser la flexion dans les sols, et une autre méthode différente d'analyse est utilisée qui n'exige pas l'hypothese d'aucune loi spéciale de contrainte déformation. On observe que les déformations maximum de traction à la rupture augmentent avec l'accroissement de la teneur en eau, indépendamment du genre d'essai ou de la teneur optimum en eau. Cela confirme que les argiles devraient être compactées à des teneurs en eau élevées lorsque l'on s'attend à une déformation de traction considérable du sol. Les valeurs du module initial tangent et du module sécant (à contrainte maximum) pour chacune des argiles sont, d'une façon marquée, plus grandes en tension qu'en compression, et les valeurs relatives sont influencées par la teneur en eau. Ainsi, l'utilisation de valeurs identiques en traction et en compression dans l'analyse de la structure du sol n'est pas justifiée.

海水中の3価および6価のクロムの分別定量法

海水中の3価および6価のクロムを分別して定量する方法を提出した. この方法の原理は, 同一試水から2個の独立した分析試料をとり, 片方は水酸化鉄により直接にクロムを捕集し, もう一方は, 亜硫酸ソーダで6価のクロムを還元した後に同様の捕集をおこなうという操作をもととしている. 分析操作の際のクロムの回収率は, 放射性トレーサーとしてクロム-51を加えて吟味した. 最終段階では, ヂフェニルカルバジド試薬による分光光度法でクロムを測定した. この方法によるクロムの定量的測定の下限は, 0.02μgCr/lの付近にある. またこの方法によってえられたミクログラム範囲の3価および6価のクロムに対する分析値の標準偏差は, それぞれ約15および20%と推定される.

A differential method of photometric analysis. Part II. Application to solutions containing more than one component

The first page of this article is displayed as the abstract.

A differential method of photometric analysis. Part I. Application to solutions containing one component

The first page of this article is displayed as the abstract.

Differential thermal curves of certain hydrous and anhydrous minerals, with a description of the apparatus used

Investigations employing the differential thermal method of analysis have been steadily increasing during the past few years. Significant changes in the recording system have been developed mainly by replacing the camera-galvanometer type of recorder with the mechanical type and finally with the electronic potentiometer. The use of the electronic recording potentiometer has made possible and practical multiple thermal analyses. The apparatus described in this paper makes use of Brown Instrument Company electronic controller and recorder units. Details of the construction and schematic wiring diagrams are included.One hundred and three differential thermal curves are listed, many of which do not appear elsewhere in the literature. This is the first report of a lengthy program of mineral investigation employing this method of analysis.

Analysis of the α-particles emitted from thorium C and actinium C

In a recent paper, an account has been given of the analysis of the long range α-particles emitted by radium C. Nine distinct groups of α-particles were detected varying in range between 7·8 and 11·6 cm. in air. Evidence was given that the emission of γ-rays from radium C is intimately connected with the occurrence of these groups of long range α-particles, and it was concluded that the γ-rays arise from the transition of an α-particle in an excited nucleus between two levels of different energies. This question has been discussed in more detail by Rutherford and Ellis, who have advanced a tentative theory to account for the relation between the energies of the γ-rays emitted from radium C. In the present paper we give the results of a corresponding analysis of the long range α-particles from thorium C and an analysis of the groups of α-particles emitted from actinium C. In these experiments the differential method of analysis was used, as in the experiments with radium C. In the present experiments, however, instead of recording the α-particles photographically on a moving film, we have mainly employed the automatic method of counting, using thyratrons in place of the oscillograph. This method, which has been developed by one of us (C. E. Wynn-Williams), has been fully discussed in a recent paper. Here it suffices merely to refer to one or two points of special interest in connection with the present research.