Extra-large crystal emulsion detectors for future large-scale experiments

Photographic emulsion is a particle tracking device which features the best spatial resolution among particle detectors. For certain applications, for example muon radiography, large-scale detectors are required. Therefore, a huge surface has to be analyzed by means of automated optical microscopes. An improvement of the readout speed is then a crucial point to make these applications possible and the availability of a new type of photographic emulsions featuring crystals of larger size is a way to pursue this program. This would allow a lower magnification for the microscopes, a consequent larger field of view resulting in a faster data analysis. In this framework, we developed new kinds of emulsion detectors with a crystal size of 600-1000 nm, namely 3-5 times larger than conventional ones, allowing a 25 times faster data readout. The new photographic emulsions have shown a sufficient sensitivity and a good signal to noise ratio. The proposed development opens the way to future large-scale applications of the technology, e.g. 3D imaging of glacier bedrocks or future neutrino experiments.Comment: Version accepted for publication in JINS

A new application of emulsions to measure the gravitational force on antihydrogen

We propose to build and operate a detector based on the emulsion film technology for the measurement of the gravitational acceleration on antimatter, to be performed by the AEgIS experiment (AD6) at CERN. The goal of AEgIS is to test the weak equivalence principle with a precision of 1% on the gravitational acceleration g by measuring the vertical position of the anni- hilation vertex of antihydrogen atoms after their free fall in a horizontal vacuum pipe. With the emulsion technology developed at the University of Bern we propose to improve the performance of AEgIS by exploiting the superior position resolution of emulsion films over other particle de- tectors. The idea is to use a new type of emulsion films, especially developed for applications in vacuum, to yield a spatial resolution of the order of one micron in the measurement of the sag of the antihydrogen atoms in the gravitational field. This is an order of magnitude better than what was planned in the original AEgIS proposal.Comment: 17 pages, 14 figure

Strategi Komunikasi Riau Vaper Community dalam Kampanye Anti Rokok pada Usia Remaja di Kota Pekanbaru

Based on data from the Ministry of Health, Riau Province included into the top 5 highest register of the smokers in adolescence with a percentage of 51.3%. As for the city of Pekanbaru, according to data from the Provincial Health Office of Riau percentage of smokers at an early age is increasing every year. The purpose of the study is to determine the communication strategy used by Riau Vaper Community as one community in Pekanbaru city that has a special concern with tobacco cigarettes and tried to give the campaign a way to educate the youth who are vulnerable to the use of tobacco cigarettes.This research using qualitative descriptive methods and data collection techniques are grouped through observation, interviews and documentation. The informant in this research were five people who were taken by purposive sampling technique. Interactive data analysis model the author uses to describe the results of research into techniques for data analysis and data validity checking researchers used a technique extension of participation and triangulation.These results indicate that communication strategies Riau Vaper Community in the campaign is to use the media, especially social media is already widely used youth. The use of social media like Instagram, Facebook, Twitter and Path became the focus of a campaign to be conducted Riau Vaper Community. In addition to social media, Riau Vaper Community also use print media such as newspapers and radio. Riau campaign conducted by the Community Vaper do with the nature of education, choice of words is not complicated and does not use the word term is done so that the audience does not have any errors in response to the message delivered or saturation in listening to the message

A role for the cleaved cytoplasmic domain of E-cadherin in the nucleus

Cell-cell contacts play a vital role in intracellular signaling, although the molecular mechanisms of these signaling pathways are not fully understood. E-cadherin, an important mediator of cell-cell adhesions, has been shown to be cleaved by γ-secretase. This cleavage releases a fragment of E-cadherin, E-cadherin C-terminal fragment 2 (E-cad/CTF2), into the cytosol. Here, we study the fate and function of this fragment. First, we show that coexpression of the cadherin-binding protein, p120 catenin (p120), enhances the nuclear translocation of E-cad/CTF2. By knocking down p120 with short interfering RNA, we also demonstrate that p120 is necessary for the nuclear localization of E-cad/CTF2. Furthermore, p120 enhances and is required for the specific binding of E-cad/CTF2 to DNA. Finally, we show that E-cad/CTF2 can regulate the p120-Kaiso-mediated signaling pathway in the nucleus. These data indicate a novel role for cleaved E-cadherin in the nucleus

Pengaruh Desa Wisata Kandri terhadap Peningkatan Kesejahteraan Masyarakat Kelurahan Kandri Kota Semarang (Studi Kasus: Kelurahan Kandri Semarang)

Kelompok sadar wisata atau POKDARWIS Kelurahan Kandri membentuk sebuah konsep Desa Wisata, dengan maksud tujuan dapat meningkatkan kesejahteraan masyarakat Kandri. Dampak positif yang diharapkan yaitu dapat meningkatkan pendapatan, masyarkat dapat menempuh pendidikan, dan masyarakat dapat menikmati fasilitas kesehatan yang telah di sediakan oleh pemerintah. Tujuan dari penelitian ini adalah untuk mengidentifikasi hubungan dan pengaruh adanya Desa Wisata Kandri terhadap peningkatan kesejahteraan masayarakat kelurahan kandri. Metode yang digunakan yaitu metode kuantitatif, dengan menggunakan analisis yaitu analisis diskriptif kuantitatif dan analisis regresi. Hasil dari analisis diatas diketahui bahwa keberadaan Desa Wisata dapat mempengaruhi peningkatan kesejahteraan masyarakat terbukti dari persentase manfaat yang dirasakan masyarakat dengan keberadaan Desa wisata Kandri dalam meningkatkan kesejahteraan masyarakat didominasi 60 % mengatakan tinggi, 38 % mengatakan sedang, dan hanya sebesar 2 % yang mengatakan rendah, hal tersebut menandakan bahwa keberadaan desa wisata kandri cukup signifikan dalam meningkatkan kesejahteraan masyarakat Kelurahan Kandri. Kemudian berdasarkan analisis regresi dapat diketahui Nilai signifikansi pada tabel anova menunjukkan 0.036. Maka pada kasus ini, variabel X berpengaruh terhadap variabel Y karna nilai sig < 0,05 dengan kata lain adanya desa wisata berpengaruh terhadap indikator peningkatan kesejahteraan masyarakat Kandri

Nuclear emulsions for the detection of micrometric-scale fringe patterns: an application to positron interferometry

Nuclear emulsions are capable of very high position resolution in the detection of ionizing particles. This feature can be exploited to directly resolve the micrometric-scale fringe pattern produced by a matter-wave interferometer for low energy positrons (in the 10-20 keV range). We have tested the performance of emulsion films in this specific scenario. Exploiting silicon nitride diffraction gratings as absorption masks, we produced periodic patterns with features comparable to the expected interferometer signal. Test samples with periodicities of 6, 7 and 20 {\mu}m were exposed to the positron beam, and the patterns clearly reconstructed. Our results support the feasibility of matter-wave interferometry experiments with positrons.Comment: 15 pages, 10 figure

Effect of laser surface modification (LSM) on laser energy absorption for laser brazing

Since the development of the laser in the 1960s a rapid development of research interests in science and technology took place. Since then, the need of laser application in industrials such as automotive, aerospace and electronics is increasing because of several advantages like automation worthiness, noncontact processing and product quality improvement. In this present study, the effect of Laser Surface Modification (LSM) on pure copper plate towards the laser energy absorption during indirect laser brazing process was studied. The laser brazing experiment was conducted inside a chamber under controlled vacuum pressure with 400Pa and irradiated with constant 140 Watt laser power. The defocusing features for laser brazing was used in order to find better focal position. Accordingly, the focal length for this laser brazing experiment was set to the focus point at 124 mm from the focal plane. Meanwhile, during LSM process, laser parameters such as laser scanning speed and focus length have been kept constant throughout the surface modification process. Yet, the laser power and laser frequency have been varied from 9 Watt to 27 Watt and 10 kHz to 80 kHz respectively. Apparently, surface roughness due to surface removal and oxide layer formation were presented during LSM process. These two surface integrities were found to be the factors of increasing laser energy absorption. It was discovered that an increase in surface roughness and oxide layer formation can absorb more laser energy which then results an increase in brazing temperature during laser brazing. This is because, increasing surface roughness will scatter the laser energy over a larger surface area, multiply the reflections in the surface irregularities while the oxide layer will enhance the interference phenomena of laser energy occurring inside the oxide layer. Both mechanisms increase laser energy absorptivity during laser brazing which results a high brazing temperature