On the computation of one-loop amplitudes with external fermions in 4d heterotic superstrings

We present the technical tools needed to compute any one-loop amplitude involving external spacetime fermions in a four-dimensional heterotic string model a` la Kawai-Lewellen-Tye. As an example, we compute the one-loop three-point amplitude with one "photon" and two external massive fermions ("electrons"). As a check of our computation, we verify that the one-loop contribution to the Anomalous Magnetic Moment vanishes if the model has spacetime supersymmetry, as required by the supersymmetric sum rules.Comment: 1+59 pages, TeX macros included (AMSFonts required

On the Compton Scattering in String Theory

We explicitly compute the Compton amplitude for the scattering of a photon and a (massless) ``electron/positron'' at tree level and one loop, in a four-dimensional fermionic heterotic string model. We comment on the relationship between the amplitudes we compute in string theory and the corresponding ones in field theory.Comment: 1+12 pages, LaTe

HUBUNGAN ANTARA KOMUNIKASI ANTARPRIBADI (INTERPERSONAL) DENGAN KEPUASAN KERJA PADA KARYAWAN PT. TORSINA REDIKON

ABSTRAC ATICK NURMAWATI. The Relationship Between Interpersonal Communication With Job Satisfaction In Employees Of PT. Torsina Redikon. Thesis, Jakarta : Economics Education Studies Program, Concentration of Education Administration, Faculty of Economics, State University of Jakarta, 2012. This study aims to determine whether there is a relationship between interpersonal communication with job satisfaction in employees of PT. Torsina Redikon. The study was conducted over two months, starting in May until June 2012. The method used is survey method with the correlational approach. The study population was all employees of PT. Torsina Redikon much as 201 people, and affordable population of this study were employees of the office staff totaling 50 people with 44 people as sample. Samples were taken using simple random sampling. Job Satisfaction (variable Y) used an instrument with a Likert Scale. Before the instrument is used variable, construct validity tested through the validation process is the calculation of the correlation coefficient score points with the total score and reliability testing with Cronbach Alpha formula. Reliability of the results of the variable item Y (Job Satisfaction) of 0.919. This proves that the variable Y has a very high reliability. Interpersonal Communications (Interpersonal) (Variable X) also used the instrument with a Likert Scale. Before the instrument variable X is used, tested the construct validity through a validation process is the calculation of the correlation coefficient score points with the total score and reliability testing with Cronbach Alpha formula. The results of the variable X reliabilits item (Interpersonal Communication (Interpersonal)) of 0.903. This proves that the variable X has a very high reliability. Test requirements analysis is performed by finding the regression equation obtained Y = 15.49 + 0.654 X. The results of normality test liliefors produce Lhitung = 0.095 whereas for n = 44 Ltabel at 0.05 significance level is 0.133. Because Lhitung <Ltabel the variables X and Y are normally distributed. Testing the hypothesis by generating regression test keberartian Fhitung (15.89)> Ftabel (4.07) which means that the regression equation produces Fhitung signifikan.Uji linearity regression (0.69) <Ftabel (2.19) thus concluded that the regression equation linear. Product moment correlation coefficient calculation result rhitung = 0.528. Subsequently keberartian correlation coefficient test using the t-test, produce tcount (3.99)> TTable (1.68). The results of these studies concluded that there is a positive relationship between interpersonal communication with the performance of the employee. With a coefficient of determination or test results obtained 27.45% determinant of job satisfaction variable (Y) is determined by interpersonal communication (interpersonal) (X). Keywords: Job Satisfaction, Interpersonal Communications (Interpersonal

A qualitative assessment of what comprises an effective and positive supervisor-student clinician relationship in speech-language pathology

The purpose of this study was to gain a better understanding of the factors that constitute a positive and negative supervisor-supervisee relationship as perceived by speech-language pathology graduate students. Clinical practicum experiences were analyzed using qualitative methods via recorded in-depth participant interviews. After the data were collected and transcribed, the narratives were analyzed to draw useful inferences and discover underlying themes using a phenomenological methodology approach. Two overlaying themes, ASHA’s Task 1 of Supervision and Anderson’s Continuum Model of Supervision, were identified from the participants’ interviews and were used to categorize the data. Results indicate the most likely factors attributed to a positive clinical experience included constructive feedback, respect, positive praise, clear expectations and structured clinical guidance while the factors that were most likely attributed to a negative experience were lack of constructive feedback, lack of perceived respect, negative criticism, unclear expectations, and minimal clinical guidance

PENGARUH STRUKTUR AKTIVA, PERTUMBUHAN PENJUALAN DAN UKURAN PERUSAHAAN TERHADAP STRUKTUR MODAL Studi Pada Perusahaan Manufaktur yang Terdaftar di Bursa Efek Indonesia Tahun 2008-2011

PENGARUH STRUKTUR AKTIVA, PERTUMBUHAN PENJUALAN DAN UKURAN PERUSAHAAN TERHADAP STRUKTUR MODAL Studi Pada Perusahaan Manufaktur Yang Terdaftar di Bursa Efek Indonesia Tahun 2008-2011 ATICK LATIFAH RAHMAWATI NIM. F1211013 ABSTRAK Penelitian ini bertujuan untuk mengetahui faktor-faktor yang mempengaruhi struktur modal suatu perusahaan. Variabel dependennya yaitu struktur modal, sedangkan variabel independennya yaitu struktur aktiva, pertumbuhan penjualan, dan ukuran perusahaan. Hipotesis yang diajukan adalah (1) struktur aktiva berpengaruh positif terhadap struktur modal (2) pertumbuhan penjualan berpengaruh positif terhadap struktur modal (3) ukuran perusahaan berpengaruh terhadap struktur modal. Populasi dalam penelitian ini adalah seluruh perusahaan manufaktur yang terdaftar di Bursa Efek Indonesia dari tahun 2008-2011. Metode pengumpulan sampel dengan menggunakan teknik purposive sampling. Sampel yang diperoleh yaitu 85 perusahaan. Alat analisis yang digunakan yaitu regresi linier yang digunakan untuk menganalisis pengaruh variabel bebas terhadap variabel terikat. Pengujian yang dilakukan dalam penelitian ini adalah pengujian normalitas data, pengujian asumsi klasik yang meliputi uji multikolinearitas, uji autokorelasi, dan uji heteroskedastisitas. Sedangkan untuk menguji hipotesis digunakan pengujian koefisien regresi simultan (Uji-F), pengujian koefisien regresi parsial (Uji-t) dan pengujian ketepatan perkiraan (Uji-R2). Hasil yang diperoleh dari uji-F bahwa struktur aktiva, pertumbuhan penjualan, dan ukuran perusahaan berpengaruh signifikan terhadap struktur modal. Dari uji-t diperoleh hasil bahwa ukuran perusahaan berpengaruh positif signifikan terhadap struktur modal. Struktur aktiva dan pertumbuhan penjualan tidak berpengaruh signifikan terhadap struktur modal. Kata kunci: struktur modal. struktur aktiva, pertumbuhan penjualan, ukuran perusahaan. THE EFFECTS OF TANGIBLE ASSETS, SALES GROWTH AND FIRM SIZE PF CAPITAL STRUCTURE Studies On Manufacturing Companies Listed On The Indonesia Stock Exchange (idx) Period 2008 to 2011 ATICK LATIFAH RAHMAWATI NIM. F1211013 ABSTRACT This research aims to analyze the factors affecting a company’s capital structure. The dependent variable of research was capital structure, while the independent ones were tangible assets, sales of growth, and firm size. Hypothesis in this study were (1) tangible assets have a positive effect on the capital structure (2) sales of growth have positive effect on the capital structure (3) firm size have a positive effect on the capital structure. The population of research was all manufacturing firms that published in Indonesia Stock Exchage (idx) during 2008 – 2011. The sampling technique employed was purposive sampling one. The sample obtained was 85 companies. Technical analysis of the data used in this study was the linear regression used to analyzed the influence pf independent variables on the dependent variable. Tests conducted in this study was testing the normality data, which includes testing the assumpstions of classical test multicollinearity, autocorrelation test, and heteroskedasity test. While the test used to test the hypothesis simultan regression coefficient (F test), testing the partial regression coefficient (t test), and accuracy of estimates (R2 test). The result obtained from F-test show that tangible assets, sales of growth, and firm size affect significantly the capital structure. From the t-test, it is found that firm size effect significantly on the capital structure. While tangible assets and sales of growth not affect significantly on the capital structure. Keywords: capital structure, tangible assets, sales of growth, firm size

World-Sheet Supersymmetry Without Contact Terms

Green and Seiberg showed that, in simple treatments of fermionic string theory, it is necessary to introduce contact interactions when vertex operators collide. Otherwise, certain superconformal Ward identities would be violated. In this note, we show how these contact terms arise naturally when proper account is taken of the superconformal geometry involved when punctures collide. More precisely, we show that there is no contact term at all! Rather, corrections arise to the ``na\"\i ve" formula when the boundary of moduli space is described correctly.Comment: 14pp., 2 figures (included

Vanishing Theorems for the Self-Dual N=2 String

It is proven that up to possible surface terms, the only non-vanishing momentum-dependent amplitudes for the self-dual N=2 string in $R^{2,2}$ are the tree-level two and three-point functions, and the only non-vanishing momentum-independent amplitudes are the one-loop partition function and the tree-level two and four-point functions. The calculations are performed using the topological prescription developed in an earlier paper with Vafa. As in supersymmetric non-renormalization theorems, the vanishing proof is based on a relationship between the zero-momentum dilaton and axion.Comment: 8 pages te

Higher Loop Spin Field Correlators in Various Dimensions

We compute higher-point superstring correlators involving spin fields in various even space-time dimensions D at tree-level and to arbitrary loop order. This generalizes previous work in D=4 space-time dimensions. The main focus are D=6,8 and D=10 superstring compactifications for which correlation functions with four and more spin fields are computed. More precisely, we present every non-vanishing six-point function. A number of results can even be derived for arbitrary D. A closed formula for the correlators with any number of fermions psi and two spin fields S in D space-time dimensions is given for arbitrary genus. Moreover, in D=6 and for arbitrary genus, we find a general formula for the correlators . The latter serve as basic building blocks to construct higher-point fermionic correlation functions. In D=8 we can profit from the SO(8)-triality to derive further tree-level correlators with a large numbers of spin fields.Comment: 47 pages, 1 figure; v2: typos corrected; submitted to JHE

Path-Integral Quantization of the (2,2) String

A complete treatment of the (2,2) NSR string in flat (2+2) dimensional space-time is given, from the formal path integral over N=2 super Riemann surfaces to the computational recipe for amplitudes at any loop or gauge instanton number. We perform in detail the superconformal gauge fixing, discuss the spectral flow, and analyze the supermoduli space with emphasis on the gauge moduli. Background gauge field configurations in all instanton sectors are constructed. We develop chiral bosonization on punctured higher-genus surfaces in the presence of gauge moduli and instantons. The BRST cohomology is recapitulated, with a new space-time interpretation for picture-changing. We point out two ways of combining left- and right-movers, which lead to different three-point functions.Comment: 36 pages, LaTeX; published version (typos & eq.(7.12) corrected

Yukawa Corrections from Four-Point Functions in Intersecting D6-Brane Models

We discuss corrections to the Yukawa matrices of the Standard Model (SM) fermions in intersecting D-brane models due to four-point interactions. Recently, an intersecting D-brane model has been found where it is possible to obtain correct masses and mixings for all quarks as well as the tau lepton. However, the masses for the first two charged leptons come close to the right values but are not quite correct. Since the electron and muon are quite light, it is likely that there are additional corrections to their masses which cannot be neglected. With this in mind, we consider contributions to the SM fermion mass matrices from four-point interactions. In an explicit model, we show that it is indeed possible to obtain the SM fermion masses and mixings which are a better match to those resulting from experimental data extrapolated at the unification scale when these corrections are included. These corrections may have broader application to other models.Comment: 24 pages, 4 figure