Wireless Sensor Network for Forest Fire Detection

 Forest fires are one of problems that threaten sustainability of the forest. Early prevention system for indications of forest fires is absolutely necessary. The extent of the forest to be one of the problems encountered in the forest condition monitoring. To overcome the problems of forest extent, designed a system of forest fire detection system by adopting the Wireless Sensor Network (WSN) using multiple sensor nodes. Each sensor node has a microcontroller, transmitter/receiver and three sensors. Measurement method is performed by measuring the temperature, flame, the levels of methane, hydrocarbons, and CO2 in some forest area and the combustion of peat in a simulator. From results of measurements of temperature, levels of methane, a hydrocarbon gas and CO2 in an open area indicates there are no signs of fires due to the value of the temperature, methane, hydrocarbon gas, and CO2 is below the measurement in the space simulator

Linking Zoopharmacognocy with Ethnomedication, an Evidence Base From Sebangau National Park, Central Kalimantan Indonesia

The ability of animal to perform self-medication has been studied decades, as well as their relationship with medication practices by communities. Long-term observation of Orangutans\u27 behaviour (Pongo pygmaeus wurmbii), by communities surround Sebangau National Park, has suggested as their modes to today ethno-medication practice. The study was aimed to study the relationship of Orangutans self-medicate behavior with ethno-medication practice, in Sebangau area. The research was conducted in Punggualas, SNP, from 29 April to 03 October 2017. A number of 13 traditional healers (TH) from Karuing (n = 4), Baun Bango (n = 4), and Jahanjang (n = 5) have been interviewed. All plants are listed and photograph. Plants parts, and their mechanism of utilization were also kept for record. Meanwhile, the behavior followed the Orangutan protocol, with focus on their feeding behavior. All data were analyzed descriptively, while the relationship was analyzed using chi-square and F test. We have recorded a total 131 plants at various life forms, in Baun Bango (n = 59), Jahanjang (n = 41), and Karuing (n = 21). Plants that were found similar among three villages, removed, were only 95 left. We observed one female, showing the ability to perform self-mediaction. It is characterized by selectively choosing young leaves of Mezzetia sp., pulp of the Dyera lowii and Ilex cymosa, and lastly chew the entire leaves of Belang Handipek. It suggests a form of prevention against fatigue conditions, and the combination of these three plants species assume to be relating to fitness. This study shows that there is a relationship between the plant part used by the traditional healer and the orang- utan (x2 = 43,887; n = 115, df = 11, p-value = 0.0000), the relationship between the use of plant parts utilized by the traditional healer and orangutans (x2 = 15, 647; n = 50, df = 8, p-value = 0.0000). Furthermore, there is a relationship between the practice of traditional healer treatment using plant parts and Orang-utan (F1, 113 = 230.158; p-value = 0,000). The study urges to isolate secondary metabolites for further investigation, especially in terms of phyto-pharmacy

Hubungan Antara Psychosocial Safety Climate (Psc) Dengan Ketidakamanan Kerja Pada Karyawan Kontrak Bagian Administrasi Universitas Diponegoro Semarang

Penelitian ini bertujuan untuk mengetahui hubungan antara Psychosocial Safety Climate (PSC) dengan ketidakamanan kerja pada karyawan kontrak bagian administrasi Universitas Diponegoro dan seberapa besar sumbangan efektif PSC terhadap ketidakamanan kerja. Subjek yang terlibat dalam penelitian ini berjumlah 81 karyawan kontrak bagian administrasi yang bekerja pada 6 dari 14 unit yang berada di Universitas Diponegoro. Pendidikan akhir subjek SMA hingga D3 dengan jumlah populasi 180 karyawan, 45 karyawan dari 4 unit terlibat dalam uji coba. Pemilihan subjek dilakukan dengan teknik cluster random sampling pada tiap-tiap unit. Pengumpulan data dalam penelitian menggunakan Skala PSC (25 aitem valid, α = 0,93) dan Skala Ketidakamanan Kerja (27 aitem valid, α = 0,89). Analisis data menggunakan analisis regresi sederhana dan menunjukkan nilai koefisien korelasi antara PSC dengan ketidakamanan kerja adalah sebesar (rxy)= -0,83 (p<0,001). Hasil tersebut menunjukkan ada hubungan negatif antara PSC dengan ketidakamanan kerja yang berarti semakin positif PSC maka ketidakamanan kerja akan semakin rendah. PSC memberikan sumbangan efektif terhadap ketidakamanan kerja sebesar 69,4%, sedangkan 30,6% dipengaruhi oleh faktor-faktor lain yang tidak diukur dalam penelitian ini

Dependence of persistent gaps at Landau level crossings on relative spin

We report measurements of the quantum Hall state energy gap at avoided crossings between Landau levels originating from different conduction band valleys in AlAs quantum wells. These gaps exhibit an approximately linear dependence on magnetic field over a wide range of fields and filling factors. More remarkably, we observe an unexpected dependence of the gap size on the relative spin orientation of the crossing levels, with parallel-spin crossings exhibiting larger gaps than antiparallel-spin crossings.Comment: 4 pages, 3 figures, submitted for publicatio

Valley susceptibility of an interacting two-dimensional electron system

We report direct measurements of the valley susceptibility, the change of valley population in response to applied symmetry-breaking strain, in an AlAs two-dimensional electron system. As the two-dimensional density is reduced, the valley susceptibility dramatically increases relative to its band value, reflecting the system's strong electron-electron interaction. The increase has a remarkable resemblance to the enhancement of the spin susceptibility and establishes the analogy between the spin and valley degrees of freedom.Comment: 5 pages, 2 figure

Anomalous giant piezoresistance in AlAs 2D electrons with anti-dot lattices

An AlAs two-dimensional electron system patterned with an anti-dot lattice exhibits a giant piezoresistance (GPR) effect, with a sign opposite to the piezoresistance observed in the unpatterned region. We trace the origin of this anomalous GPR to the non-uniform strain in the anti-dot lattice and the exclusion of electrons occupying the two conduction band valleys from different regions of the sample. This is analogous to the well-known giant magnetoresistance (GMR) effect, with valley playing the role of spin and strain the role of magnetic field.Comment: 4 figures, submitted for publicatio

A Simple Dynamical Model for the Growth of Smoker Population

In this article, a simple dynamical model derived from the SIR Model that has been known in epidemiology is applied to study qualitatively the growth of smoker population in a closed population system. The population in the system is divided into three groups: potential smokers, active smokers, and quitted smokers. We derive the model by assuming that the quitted smokers can relapse into active smokers. The model consists of three nonlinear and autonomous differential equations, and is then investigated by applying the linear stability theory. We find that the increase of a number of smokers mainly depends on three parameters: how big the interaction between an active smoker and a potential smoker, an average time for being a smoker, and an average time for being a quitted smoker before relapsing into an active smoker. These three parameters are represented by a number R0, so called a threshold condition. For R0 > 1, we find that the population of active smokers always exists. Results also show that low interaction is enough to increase a number of active smokers.DOI : http://dx.doi.org/10.22342/jims.14.1.82.63-7

KINERJA KEUANGAN SUB SEKTOR HOTEL, RESTORAN, DAN PARIWISATA PADA BURSA EFEK INDONESIA SEBELUM DAN SELAMA PANDEMI COVID-19

Tujuan penelitian ini adalah (1) Untuk mengetahui dan menganalisis Profitabilitas (Gross profit margin, Operating Profit Margin, Net Profit Margin, dan Return On Asset) perusahaan sub sektor Hotel, Restoran, dan Pariwisata pada Bursa Efek Indonesia sebelum dan selama pandemi Covid-19 periode 2019 sampai dengan September 2020, (2) Untuk mengetahui dan menganalisis Likuiditas (Current Ratio, Quick Ratio, dan Cash Ratio) perusahaan sub sektor Hotel, Restoran, dan Pariwisata pada Bursa Efek Indonesia sebelum dan selama pandemi Covid-19 periode 2019 sampai dengan September 2020. Teknik Pengumpulan data dilakukan menggunakan data kepustakaan (Library Research) yang diambil dari Bursa Efek Indonesia www.idx.co.id. Alat analisis penelitian ini menggunakan Profitabilitas (Gross profit margin, Operating Profit Margin, Net Profit Margin, dan Return On Asset), Likuiditas (Current Ratio, Quick Ratio, dan Cash Ratio), serta analisis Komparatif. Hasil dari penelitian ini adalah 1). Gross profit margin mengalami penurunan sebelum dan selama pandemi Covid-19. 2). Operating Profit Margin mengalami penurunan sebelum dan selama pandemi Covid-19. 3). Net Profit Margin mengalami penurunan sebelum dan selama pandemi Covid-19. 4). Return On Asset mengalami penurunan sebelum dan selama pandemi Covid-19. 5). Current Ratio mengalami penurunan sebelum dan selama pandemi Covid-19. 6). Quick Ratio mengalami penurunan sebelum dan selama pandemi Covid-19. 7).Cash Ratio mengalami penurunan sebelum dan selama pandemi Covid-19