1,721,039 research outputs found
Interplay of polarization geometry and rotational dynamics in high-order harmonic generation from coherently rotating linear molecules
No full textFaisal F, Abdurrouf A. Interplay of polarization geometry and rotational dynamics in high-order harmonic generation from coherently rotating linear molecules. PHYSICAL REVIEW LETTERS. 2008;100(12): 123005.Recent reports on intense-field pump-probe experiments for high-order harmonic generation (HHG) from coherently rotating linear molecules have revealed remarkable characteristic effects of the simultaneous variation of the polarization geometry and the time delay on the high-order harmonic signals. We analyze the effects and give a unified theoretical account of the experimental observations. Furthermore, characteristic behavior at critical polarization angles are found that can help to identify the molecular orbital symmetry in connection with the problem of molecular imaging from the HHG data
Intense-field theory of high harmonic generation from freely rotating molecules
Full text linkAbdurrouf A. Intense-field theory of high harmonic generation from freely rotating molecules. Bielefeld (Germany): Bielefeld University; 2007.An intense-field theory of high harmonic generation from freely rotating molecules is developed. Explicit expressions of the high harmonic operator that govern the dynamic signal are derived and applied to analyze the recently measured dynamic (delay-time dependent) signals observed with the linear symmetric-top molecules. Results are given both for the usual experimental geometry in which the pump and probe polarizations are kept parallel to each other, and as a function of the relative angle between the two polarizations. They are discussed with special reference to the empirical fit formulas used earlier. Calculations are performed with respect to recent experiments and the results are obtained both in the time domain and in the spectral domain. Comparisons of the experimental data and the calculated results are made, and the role of the earlier empirical fits are partially justified. Finally, the origin of a number of hitherto unexplained salient features of the observations in the time and spectral domains is interpreted consistently by the theory
UPAYA GURU DALAM PEMBENTUKAN AKHLAK SISWA DI SMPN 2 HALONG
Full text linkAbdurrouf Syamsi. 2020. Upaya Dewan Guru Dalam Pembentukan Akhlak Siswa Pada Sekolah Menengah Pertama Negri 2 Halong. Skripsi, Jurusan Pendidikan Agama Islam, Fakultas Tarbiyah dan Keguruan. Pembimbing: H. Surawardi, M. Ag. dan Muhammad Adli Nurul Ihsan, M. Pd. I
Kata Kunci: Upaya, Pembentukan, Akhlak.
Pada awalnya anak cenderung memperlihatkan karakter dan watak aslinya yang di bawa dari lingkungan keluarga. Inilah tugas sekolah, terutama dewan guru untuk membimbing akhlak anak agar menjadi anak yang berakhlak baik. Ini merupakan tugas yang tidak ringan, sebab mengubah karakter dan akhlak yang telah terbentuk tidaklah mudah. Oleh karena itu mendidik akhlak anak merupakan tugas yang cukup berat, maka sekolah-sekolah Islam atu madrasah-madrasah memberikan perhatian khusus terhadap pendidikan akhlak, terlihat dari kurikulumnya yang memisahkan pelajaran akhlak menjadi satu pelajaran khusus, yakni Akidah Akhlak.
Penelitian ini bertujuan untuk mengetahui upaya dewan guru dalam pembentukan akhlak siswa pada Sekolah Menengah Pertama Negri 2 Halong.
Penelitian ini merupakan penelitian lapangan, yaitu penelitian yang dilakukan dengan terjun langsung ke lapangan untuk meneliti upaya dewan guru dalam pembentukan akhlak siswa pada Sekolah Menengah Pertama Negri 2 Halong.
Metode yang digunakan dalam penelitian ini adalah metode deskriptif kualitatif yaitu suatu penelitian yang bertujuan untuk membuat diskripsi atau gambaran, tulisan secara sistematik, faktual, dan aktual mengenai fakta-fakta, sifat-sifat, dan yang berhubungan dengan fenomena yang diamati dengan menggunakan logika ilmiah.
Hasil penelitian menunjukan bahwa semua upaya dewan guru dalam pembentukan akhlak siswa pada Sekolah Menengah Pertama Negri 2 Halong, dengan cara adanya pembinaan akhlak di sekolah melalui kegiatan-kegiatan keagamaan yang dilaksanakan secara rutin di Sekolah meliputi: Tausiyah, (Muhadarah), Tahfidz, Tadarus Alquran,berdo’a sebelum belajar, Salat Dzuhur berjamaah di mesjid, serta kegiatan Peringatan Hari Besar Islam seperti (maulid Nabi Muhammad SAW).
Jadi, upaya dewan guru dalam pembentukan akhlak siswa pada Sekolah Menengah Pertama Negri 2 Halong dapat dikategorikan baik dari segi pembinaan akhlak
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
THE INFLUENCE OF STUDENTS PERCEPTIONS ABOUT ENGLISH LEARNING ON THEIR ABILITIES IN LEARNING ENGLISH AS AN INTERNATIONAL LANGUAGE AT THE TWELVE CLASS IN MAN BABAKAN CIWARINGIN
Full text linkM. Abdurrouf. 14111310040. The Influence of Students Perceptions about English Learning on Their Abilities in Learning English as An International Language at The Twelve Class in MAN Babakan Ciwaringin
The goals of this research are: (1) to know and present the perceptions of students of Cirebon senior high school about English learning located in MAN Babakan Ciwaringin. (2) to know and present the students abilities of Cirebon senior high school in learning English. (3) to know and present the positive significance influence between students perception in English learning on their abilities in learning English. .
This research is quantitative research. The population of this research is students at the twelve class in MAN Babakan Ciwaringin Cirebon in number of 412 students. The techniques of sampling selected 45 students as the respondents. The instrument of collecting data used questionnaire. The questionnaire contains of 12 statements that are provided to examining the students perceptions about English. The technique of collecting data used test. The test provided to finding the level of students mastery in four English skills which are listening, speaking, reading and writing. The tests are used to examining the abilities of the students in mastering English. In analyzing the data, this research used correlation product moment, formula of mean to find the average, formula of percentage, formula of determination coefficient to analyze the contribution, and t-test. The t-test application used to analyze the hypotheses is SPSS v.16.0
Based on the analysis, the finding of the research present that most of students at the twelve class in MAN Babakan Ciwaringin had positive responses about English. It is shown in the number of 60.4 in percentage of 83% which included into the level of “Very Good”. The average of students mastery in English included into the level of enough. The value of mastery included into the number of 70 whereas it had passed the minimum score which is 70. According to the analysis, there was high correlational influence between students perceptions on their abilities in learning English which refer in number 0.91. The finding of the analysis also described that the contribution influence of perception into the abilities involve in “high” which shown in the percentage number of 82.8%
Theory of intense-field dynamic alignment and high-order harmonic generation from coherently rotating molecules and interpretation of intense-field ultrafast pump-probe experiments
No full textAbdurrouf A, Faisal F. Theory of intense-field dynamic alignment and high-order harmonic generation from coherently rotating molecules and interpretation of intense-field ultrafast pump-probe experiments. PHYSICAL REVIEW A. 2009;79(2): 023405.A quantum theory of intense-field pump-probe experiments proposed by us recently [F. H. M. Faisal et al., Phys. Rev. Lett. 98, 143001 (2007) and F. H. M. Faisal and A. Abdurrouf, Phys. Rev. Lett. 100, 123005 (2008)] is derived here fully and applied to investigate the phenomena of dynamic alignment and high-order harmonic generation (HHG) from coherently rotating linear molecules. The theory is developed from the basic quantum transition amplitude for the HHG and used to relate the Fourier transform (FT) of the expectation value of the dipole operator to the rate of emission of the HHG photons. It permits us to give analytical expressions for the HHG signals and their simultaneous dependence on the two externally available control parameters-the delay-time, t(d), between the pump and the probe pulse, and the relative angle, alpha, between their polarizations. A relation between the basic "one-molecule" and the macroscopic "many-molecule" HHG signals is obtained from the phase-matching condition for HHG in an ideal medium. The requirement for the coherent HHG signal and the "elastic" molecular transition, in contrast to the "inelastic" transitions and the "hyper-Raman" emission, is discussed. The effect of the "delayed" probe pulse on the dynamic alignment induced by the pump-pulse, the mean rotational energy of the molecule during the period between the pump and the probe pulse, as well as a method of estimating the effective temperature of the molecules are analyzed. A "revival theorem" on the number of fractional "revivals," equal to the lowest power of the "cosine operator" in the Hamiltonian of the system, times the maximum powers of the "cosine-moments" present in the signal, is derived and used to interpret the observed fractional revivals and their relative phases. A "magic" polarization angle alpha(c) = arctan root 2 approximate to 55 degrees, at which the signals for all td approach each other closely, is identified as a generic signature of a sigma(g) symmetry of the active orbital. Similarly, the presence of a "crossing neighborhood" near alpha(c) is shown to be a generic signature of an active pi(g) orbital. At an operational angle alpha(c) approximate to 55 degrees in the laboratory, a steady emission of high-order harmonic radiation from coherently rotating molecules with sigma(g) orbital symmetry (e.g., N-2) can be obtained. Finally, explicit numerical calculations are performed at specific experimental parameter values in the time domain as well as in the frequency domain. The results well reproduce all the salient features of the experimental observations for N-2 and O-2, and provide a unified theoretical interpretation of the same
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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