Multiwavelength fiber laser in four mode fiber

Multiwavelength fiber laser is a nonlinear phenomenon that has a great potential for optical communication system. A stable triple-wavelength fiber laser in four mode fiber had been demonstrated experimentally by employing Sagnac filter in a simple close loop laser cavity. The Sagnac loop filter configuration was constructed using a 2 m of polarization maintaining fiber (PMF), a 3 dB coupler and a polarization controller. The laser is able to sustain triple-wavelength laser generation at 13.1 dBm output power of Erbium-Doped Fiber Amplifier (EDFA) as all laser wavelengths produced less than 0.25 nm fluctuation for over 20 min of unstoppable lasing operation. This laser configuration also has flexibility to perform single, dual and triple wavelength laser by controlling the EDFA output power

Pengaruh Kadar Gula Darah Terhadap Kejadian Reinfark Dan Kematian Pada Penderita Sindroma Koroner Akut

Recent decades data relates between admission hyperglycemia and mortality that increase among acute coronary syndrome(ACS) patients. Aim of study is to assess relationship between hyperglycemia and Cardiac Event, i.e. death, reinfarction among ACS patients. This is a prospective cohort study, which was held on March to April 2014 among 83 ACS patients in CVCU Wahodin Sudorohusodo Hospital. Patients was grouped into two groups, hyperglycemic ACS group and normoglycemic one. Reinfarction and death events at each group was observed within first 30 days after infarction. In this study, it found death and reinfarction events were higher in hyperglycemic group than in normoglycemic group (22 vs 4, RR = 3.7, p=0.026 for death event, and 14 vs 1, RR =8.7, p=0.03 for reinfarction). Conclusion of this study was hyperglycemia is related to reinfartion and death events among ACS patients

Meningkatkan Hasil Belajar Siswa Kelas III Sekolah Dasar Alkhairaat Towera Melalui Model Pembelajaran Kooperatif Tipe Number Head Together (NHT) Pada Mata Pelajaran PKn

Permasalahan utama dalam penelitian ini adalah apakah penerapan model pembelajaran kooperatif tipe NHT dapat meningkatkan hasil belajar siswa kelas III SD Alkhairaat Towera pada mata pelajaran PKn?. Adapun tujuan dari penelitian ini adalah meningkatkan hasil belajar siswa Kelas III SDA Towera degan menerapkan model pembelajaran kooperatif tipe NHT pada mata pelajaran PKn. Rancanga penelitian ini mengacu pada model penelitian yang dikemukakan oleh Arikunto (2009:16) yang terdiri atas 4 komponen, yaitu: (1) perencanaan, (2) pelaksanaan tindakan, (3) pengamatan/observasi, dan (4) refleksi. Berdasarkan hasil penelitian yang dilakukan di kelas III SD Alkhairaat Towera diketahui bahwa terjadi peningkatan hasil belajar dari siklus I ke siklus II, aktivitas siswa pada siklus satu berada pada kategori cukup serta aktivitas guru juga berada pada kategori cukup persentase ketuntasan belajar klasikal pada siklus I sebesar 44,4%. Ini menandakan penelitian tindakan yang dilakukan belum berhasil sehingga perlu dilanjutkan pada pelaksanaan siklus dua. Aktivitas siswa pada siklus dua yang diamati menggunakan lembar observasi menunjukan adanya perbaikan darisiklus satu jika pada siklus satu aktivitas siswa berada pada kategori cukup di siklus dua meningkat menjadi baik, begitu pula dengan aktivitas guru yang pada siklus satu berada pada kategori cukup di siklus dua meningkat menjadi baik. Persentase ketuntasan belajar klasikal di siklus II meningkat dari siklus satu yang hanya 44,4% di siklus dua meningkat menjadi 77,7%. Berdasarkan hasil tersebut, dapat disimpulkan bahwa penerapan model pembelajaran kooperatif tipa Number Head Together dapat meningkatkan hasil belajar siswa Kelas III SD Alkhairaat Towera pada mata pelajaran PKn

The comparison of dual wavelength fiber laser spectrum in SMF and HNLF by utilizing laser diode

A dual-wavelength erbium-doped fiber (EDF) fiber ring laser in single mode fiber and highly nonlinear fiber is demonstrated and both optical spectrums are compared at 400 mA of Laser Diode (LD) output. The fiber ring laser cavity incorporated sagnac loop had been applied for the laser to lase two wavelengths simultaneously due to high birefringent in polarizaton-maintaining fiber (PMF). Experimental results show that, owing to the contributions of two degenerate fourwave mixings (FWM) in the HNLF and the dual-wavelength proposed fiber laser is quite stable with small fluctuation power in 1.93 dB within 24 minutes in HNLF

Strengthening Local Wisdom-Based Work Culture in Improving the Quality of Education in Madrasah

This study aimed to improve the quality of madrasah education by strengthening the work culture of Madrasah Aliyah teachers in the western region of the Central Lampung district. This research uses a qualitative case study approach. Data collection techniques used are observation, interviews, and documentation. The data analysis technique uses Miles and Huberman's interactive analysis, which includes; the process of data collection, data reduction, data presentation, and conclusion. The results showed that improving the quality of madrasah education through strengthening the work culture of Madrasah Aliyah teachers was carried out through the implementation of work culture in planning, work culture in organizing, work culture in performance, and work culture in supervision, work culture in evaluation. This research has implications for the importance of a work culture that must be managed in such a way as to achieve the desired goals

Degeneration of four wave mixing in 500 m step index two mode fiber

Four wave mixing (FWM) in two-mode fiber was experimentally demonstrated at 24.7 dBm of output Erbium doped fiber amplifier (EDFA). The 0.5 km two mode fiber in laser cavity enhances the performance of four wave mixing by suppressing the homogenous broadening effect in erbium-doped fiber and perform a stable oscillation. At output EDFA approaches to 24.7 dBm, FWM is generated and the increasing of output EDFA induced the optical signal to noise ratio (OSNR) of all laser peaks

Microclimate inside a tropical greenhouse equipped with evaporative cooling pads

Tropical greenhouses require active evaporative cooling system such as pad-and-fan to ensure a suitable microclimate for crop production. Excess heat causes indoor temperature to become hotter than desired resulting in detrimental effects to crop growth and production. Solar radiation intensity and outside temperature affect temperature and relative humidity level inside a greenhouse, while wide gradients in temperature and relative humidity can cause problems related to crop growth and production uniformity. A 300 m2 greenhouse, equipped with evaporative pad and four exhaust fans at each end walls, was used in the study. Horizontal and vertical profiles of the temperature and relative humidity inside the greenhouse were investigated. Results showed that temperature increased from evaporative pad area to exhaust fans area in a horizontal plane, while relative humidity showed an inverse pattern from temperature. In the vertical plane, temperature increased, while relative humidity decreased from lower level to the upper level. ANOVA results showed that in overall, temperature and relative humidity inside the greenhouse were uniform as there was no significant difference at 95% confidence interval. Thus, it was concluded that greenhouse cooling system by evaporative pad and exhaust fans are suitable for application in a tropical country such as Malaysia

Extensive Tracking Performance Analysis of Classical Feedback Control for XY Stage Ballscrew Drive System

Performance analysis in term of identifying the system's transient response, stability and system's dynamical behavior in control system design is undeniably a must process. There are several ways in which a system can be analyzed. An example of well known techniques are using time domain and frequency domain approach. This paper is focused on the fundamental aspect of analysis of classical feedback controller in frequency domain of XY milling table ballscrew drive system. The controller used for the system is the basic PID controller using Matlab SISOTOOL graphical user interface. For this case, the frequency response function (FRF) of the system is used instead of using estimated model of transfer function to represent the real system. Result in simulation shows that after proper tuning of the controller, the system has been successfully being controlled accordingly. In addition, the result also fulfill the set requirement of frequency domain analysis in terms of the required gain and phase margin, the required maximum peak sensitivity and complimentary sensitivity function and the required stability

RFID Based Inspection System for Assembly Operation

This paper is called RFID based for Inspection System for assembly operation. The Radio Frequency Identification Method (RFID) system is used in developing an inspection system to inspect the assembly product by defining the correct amount and right components that have been assembled. The system consists of the RFID system driven by PC, conveyor and external devices such as indicator lamp, press button, and buzzer that driven by a programmable logic controller (PLC). The RFID system will read the data of tags that have been attached to the parts of product when the product passes through the RFID reader. The data will be read by the Visual Basic (VB) interfacing software on PC and will be compared with the saved standard data. The product is considered accepted if the data is matching with the standard data while the product will be considered reject if there are unequal numbers of parts or wrong component being assembled. The warning system that consists of indicator lamp and buzzer will be activated when the product is rejected. Performance analysis of the read range of the reader and relationship between selected materials of parts is conducted to estimate the effectiveness of integration of RFID into the inspection syste

Technical competencies of oil and gas construction project managers in Malaysia

The oil and gas business is one of the most important and largest industries in the world. Despite the industry's large economic contribution, the output of major projects has not met expectations, particularly with regard to cost and schedule goals. project managers should possess sufficient technical knowledge and skill to perform their jobs, especially in the oil and gas industry. This paper aims to assess the level of technical competencies for oil and gas construction project managers in Malaysia.Data were collected from 75 respondents from different organisations that are involved with oil and gas construction projects in Malaysia by using a questionnaire. The current level of construction project managers in the oil and gas construction in Malaysia are mostly competent and have the most satisfied rating in determining appropriate construction methods, followed by project scheduling, directing and monitoring the project's progress. Hopefully, this study can help the industry sector, especially in oil and gas, to find competent technical PMs to ensure the project can be delivered well