On the decay law for unstable open systems

We use (nonconservative) dynamical semigroups to investigate the decay law of a quantum unstable system weakly coupled with a large environment. We find that the deviations from the classical exponential law are small and can be safely ignored in any actual experiment.Comment: 12 pages, plain-TeX, to appear in Phys. Lett.

Density Estimates and Habitat Preferences of Two Sympatric Bird Species as Potential Bioindicators of Tropical Forest Alterations

Forestry management can shape the structure of habitat types and have important biological consequences on the composition of biodiversity. This study focused on Momotus lessonii and Eumomota superciliosa, two potential bioindicators of local and wide scale tropical forest alterations. The study took place in the Karen Mogensen Wildlife Refuge (Costa Rica), a protected area characterized by two main forest habitats where the two species coexist, i.e., primary moist and second-growth dry forest. A distance sampling method was used to obtain density estimates for each species. A spot mapping approach showed an apparent partitioning of the two species at the site. The Kilometric Abundance Index (KAI) and statistical analyses revealed significant differences between the two habitats, i.e., E. superciliosa tended to be more abundant and preferred the dry forest, whilst M. lessonii favored moist environments. The development of arid and semi-arid environments characterized by open areas will probably lead to a numerical increase in E. superciliosa with a consequent expansion, while the decline of moister and homogeneously forested environments will likely affect negatively M. lessonii. We argue that these birds will act as bioindicators of local and global environmental changes, and their monitoring will enable appropriate forest management decisions for conservation purposes

Hubungan Antara Konformitas Dengan Intensi Prososial Pada Remaja Warga Binaan Pemasyarakatan Lapas Anak Kelas II a Kutoarjo

Penelitian ini bertujuan untuk mengkaji hubungan antara konformitas dengan intensi prososial pada remaja warga binaan pemasyarakatan LAPAS Anak Kelas II A Kutoarjo.Populasi penelitian ini yaitu remaja warga binaan pemasyarakatan LAPAS Anak Kelas II A Kutoarjo sebanyak 110 orang. Sampel penelitian sebanyak 78 orang, sampel diambil dengan menggunakan teknik simple random sampling. Pengumpulan data menggunakan dua buah Skala Psikologi yaitu Skala Intensi Prososial (24 aitem valid, α = 0.834) dan Skala Konformitas (22 aitem valid, α = 0.836).Hasil penelitian menunjukkan koefisien korelasi rxy = 0.447 dengan p=0,000 (p<0,05). Hasil tersebut menunjukkan bahwa hipotesis yang diajukan peneliti, yaitu terdapat hubungan positif antara konformitas dengan intensi prososial dapat diterima.Nilai koefisien korelasi positif menunjukkan bahwa arah hubungan kedua variabel adalah positif, artinya semakin tinggi konformitas maka semakin tinggi intensi prososial. Konformitas memberikan sumbangan efektif sebesar 19.9% pada intensi prososial dan sebesar 80.1% dipengaruhi oleh faktor lain yang tidak diteliti dalam penelitian ini

On the Absence of the Zeno Effect in Relativistic Quantum Field Theory

We study the time evolution of decaying particles in renormalizable models of Relativistic Quantum Field Theory. Significant differences between the latter and Non Relativistic Quantum Mechanics are found -in particular, the Zeno effect seems to be absent in such RQFT models. Conventional renormalization yields finite time behavior in some cases but fails to produce finite survival probabilities in others.Comment: Revised version of the paper Time evolution and Zeno effect in relativistic quantum field theory. To appear in Phys. Lett.

Analisis Fundamental Untuk Menilai Kewajaran Harga Saham Dan Keputusan Investasi Dengan Menggunakan Metode Pendekatan Price Earning Ratio (Studi Pada Perusahan Sektor Industri Dasar Dan Kimia Yang Terdaftar Di Bei Periode Tahun 2012 – 2014)

This research to knowing the reasonableness of the price of shares in the company sector and chemical industry base by using fundamental analysis to determine the approach and investment decisions will be taken. This research is using the kind of desciptive research with quantitative approach. This population of the research is using basic industry company and chemical which listing in Indonesia Stock Exchange in the period of 2012 - 2014. The focus of this research is the fairness value of the stock price and the investment decision. The sources of data which used in this research is secondary data. The sampling technique in this research is using purposive sampling, with the determined criterias, so there are 8 companies that become a sample. The results of this study indicate that there are 7 companies whose the stock price is at undervalued condition, with consist of 4 companies can take a decision to hold the stock and 3 companies is recommended to buying the stock. The company which are in overvalued condition is PT. Surya Toto Indonesia, Tbk, so the decision that can be taken is to sell the stock

Sistem Pemetaan Penyakit dengan Menggunakan Gis di Dinas Kesehatan Kotamadya Pekanbaru

  Sistem Informasi Penyakit Merupakan salah satu informasi yang penting dalam mentukan tingkat kesehatan di masyarakat Indonesia. Karakteristik masyaraka yang terjadi pun sangat beragam. Ada yang disebabkan oleh tingkat pendidikan, tingkat kemiskinan, ataupun akibat lingkungan yang berada di daerah lebih tersebut. Oleh karena itu, sistem informasi penyakit merupakan tahap awal penencegahan peningkatan angka kesakitan, untuk mengurangi dan memperkecil angka kesakitan maka di butuh obat-obatan. Salah satu komponen sistem yang dapat digunakan adalah Sistem Informasi Geografis (SIG). SIG dapat dimanfaatkan pada setiap tahapan alokasi obat-obatan. Perancangan wilayah penyakit dirancang dengan menggunakan model Waterfall dengan langkah-langkah berikut: Requirements Definition, System and Software Design, Implementation and Unit Testing, Integration and System Testing, Operation and Maintenance. Penelitian ini bertujuan untuk memetakan daerah penyebaran penyakit di Kabupaten Pekanbaru sehingga dapat digunakan untuk menentukan daerah yang membutukan alokasi obat-obatan yang tepat agar dapat mencegah lebih cepat.   Kata Kunci : Sistem Pemetaan, GIS, Penyaki

Complete positivity and correlated neutral kaons

In relation with experiments on correlated kaons at phi-factories, it is shown that the request of complete positivity is necessary in any physically consistent description of neutral kaons as open quantum systems.Comment: LaTeX, 9 page

Dissipative effects in semileptonic B decays

We study the time evolution and decay of the neutral B-meson system using quantum dynamical semigroups. New, nonstandard terms appear in the expression of relevant observables; they can be parametrized in terms of six phenomenological constants. Although very small, these parameters may be detected in the new generation of dedicated B-meson experiments.Comment: 14 pages, plain-Te

Suppression of Zeno effect for distant detectors

We describe the influence of continuous measurement in a decaying system and the role of the distance from the detector to the initial location of the system. The detector is modeled first by a step absorbing potential. For a close and strong detector, the decay rate of the system is reduced; weaker detectors do not modify the exponential decay rate but suppress the long-time deviations above a coupling threshold. Nevertheless, these perturbing effects of measurement disappear by increasing the distance between the initial state and the detector, as well as by improving the efficiency of the detector.Comment: 4 pages, 4 figure