bluuebunny/crossref_metadata_2025 huggingface dataset:
The Thermal Effect of Unconventional Cutting Technologies on Steel DIN 1.7102
Authors: Stoklásek Pavel , Mizera Aleš , Manas Miroslav , Ovsik Martin
Published: May 2020

New technologies known as unconventional technologies make it possible to cut complex shapes at high speed and with relatively high precision. In many cases, especially in the case of thin sheet, created parts produced do not require any further treatment by post-machining. Knowledge of the accompanying phenomena, such as the heat-affected zone (HAZ) or the surface quality of the cutting edge, is necessary, for example, to assess further machining of material in these areas (e.g. drilling and reaming holes or finishing operations on the cutting edge). In this study, the thermal effect of four unconventional cutting technologies – laser, plasma, wire electrical discharge machining (wire EDM) and waterjet cutting on the cut surface of steel sheets is investigated. Steel 1.7102 (DIN 54SiCr6) was chosen for purpose of this study. The width of the HAZ and the nanohardness beneath the cut surface were analyzed.
A Full-Scale Rotor-Wake Investigation of a Free-Flying Helicopter in Ground Effect Using BOS and PIV
Authors: Schwarz Clemens , Bauknecht Andŕe , Wolf C. Christian , Coyle Alexander , Raffel Markus
Published: May 2020

Measurements in the wake of a free-flying full-scale helicopter in ground effect were performed for both quasi-steady and unsteady maneuvering flights using stereoscopic particle image velocimetry (PIV), a time-resolved background-oriented schlieren (BOS) setup, and an optical marker
tracking technique. The systems were used in a complementary way to both visualize blade tip vortices in a large portion of the rotor wake and to capture spatially resolved wake velocity data close to the ground. The high sensitivity of the BOS system enabled the detection of vortices up to
an age of ψ = 630°. Different instability mechanisms as long-wave, short-wave, and pairing instabilities were observed with varying intensity for different flight conditions. A quantitative analysis of vortex locations showed a periodic variation resulting from interactions
between consecutive vortices that led to vortex pairing. Characteristics of the wake outwash close to the ground were investigated by means of averaged velocity fields. Different patterns such as wall jet, recirculation, and ground vortex flow were quantitatively analyzed and found to be in
good agreement with previous model helicopter experiments. The instantaneous velocity data were used to detect individual blade tip vortices with ages above 450° close to the ground and to extract vortex parameters. For a takeoff maneuver, both concentrated vortices and the formation of
larger vortex structures due to bundling of several vortices were observed.
Severe paraneoplastic hypoglycemia due to a non-islet cell tumor in a patient with an advanced gastrointestinal stromal tumor
Authors: Alletto Maurizio , Burgio Antonio , Fulco Giovanni , Geraci Giulio , Groppuso Concetta , Gruttadauria Gianfranco , Manfrè Elvio , Mastrosimone Gianluca , Salvaggio Susanna , Urrico Giovanni , Vancheri Federico
Published: May 2020

Gastrointestinal stromal tumors (GIST) are the most common mesenchymal tumors of the gastrointestinal tract, mainly localized in the stomach. Most GIST derive from mutations in tyrosine kinase receptors (KIT) or platelet-derived growth factor receptor-α (PDGFRA). GISTs are rarely associated with paraneoplastic hypoglycemia caused by non-β-cells tumor. This syndrome, defined non-islet cell tumor hypoglycemia (NICTH), arises from excess tumor production of insulin-like growth factor. We describe a 67-year-old female with severe NICTH secondary to an advanced and metastatic GIST.
Trailer Towing Driving Skill Certification
Authors:   Driving Skills Standards Committee
Published: May 2020

This Recommended Practice is intended to establish a procedure to certify the trailer towing driving skill levels of professional drivers. This certification can be used by the individual driver to qualify their skills when seeking employment or other professional activity. These certification levels may also be used by test facilities or other organizations when seeking test or professional drivers of various skills.

This document provides directions for obtaining certification through Probitas Authentication®1 and associated trailer towing driving skill examination requirements.

This document is a supplement to SAE J3300, providing information specific to the trailer towing driving skill certification and clarifying the application of the rules set forth in SAE J3300 to the trailer towing certification. While the references, definitions, rules, and guidelines presented in SAE J3300 Sections 1 through 5 apply to the trailer towing certification, they are not repeated in this document.
La huella ecológica, indicador de la responsabilidad social y ambiental de cara al 2030.
Authors: Contreras Velázquez Luz María , Guillén Pérez Lisbet , Formoso Mieres Alleyne
Published: May 2020

Para cumplir el Objetivo de Desarrollo Sostenible para el 2030 que plantea garantizar modalidades de consumo y producción sostenible, es primordial el papel que deben asumir las universidades como gestor de la educación y de la gestión ambiental. La Huella Ecológica es un indicador biofísico que integra el conjunto de impactos que ejerce la comunidad sobre su entorno, medido en términos de apropiación de ecosistemas, que considera tanto los recursos necesarios como los residuos generados para el sostenimiento de dicha comunidad. El presente trabajo surge con el objetivo de comunicar a la comunidad universitaria de la Universidad Metropolitana de Ecuador, el resultado de la huella ecológica focalizado en un estudio de caso único. Se empleó la herramienta de cálculo disponible en el sitio Web del Ministerio de Ambiente de Ecuador, y se obtuvo una huella ecológica de 2.87 hectáreas globales (hag) que supera el valor de este indicador para el caso de este país. Esto significa que el estilo de vida asumido supera los límites del planeta y evidencia un conflicto entre el modelo de consumo y la sostenibilidad ambiental. Finalmente, se exponen algunas medidas correctoras para reducir la huella ecológica a fin de aportar al desarrollo sostenible.
Efecto del uso de tecnologías limpias en el control de la broca del fruto del café (Hypothenemus hampei Ferrari).
Authors: Palma Ponce Richard Leonardo , Pinargote Chóez Jesús de los Santos
Published: May 2020

El uso inadecuado de pesticidas químicos en la agricultura contribuye a la contaminación ambiental, destacándose la toxicidad para los seres vivos, la capacidad de contaminación en la atmósfera, el suelo y el agua, sobre todo al utilizar sustancias persistentes o bioacumulativas. La investigación se realizó en Jipijapa, Paján y 24 de Mayo, provincia Manabí; su objetivo fue determinar el efecto del uso de tecnologías limpias para el control de Hypothenemus hampei Ferrari, mediante la ejecución de dos experimentos: Implementación de trampas artesanales (control etológico) y el uso de extractos de Petiveria alliacea y Azadirachta indica, que controlan el Hypothenemus hampei Ferrari (broca del fruto) en el cultivo del Coffe arábica. El control etológico estuvo conformado por cuatro tratamientos y tres repeticiones en cada localidad, elaborando 20 trampas/localidad con dos atrayentes semio-químicos (sustancias que llevan mensaje químico), distribuidos aproximadamente a 20 m x 20 m, registrando cada 15 días el número de brocas capturadas. Para los extractos se usaron tres concentraciones y tres frecuencias de aplicación, conformándose 10 tratamientos y tres repeticiones. Según la prueba de Tukey al p< 0.05 se determinó diferencia estadística entre tratamientos en ambos ensayos. Para el control etológico se obtuvo p-valor: 0.023, con un coeficiente de variación de 8.91. Para la aplicación de extractos se registró diferencia estadística en la mortalidad de adultos (p-valor: 0.0075; CV: 1.38%) y huevos con un p-valor: 0.0084 y CV de 0.85%, demostrándose que existen alternativas amigables al medio ambiente para el control de plagas en cafeto.
Different Modes of Transmission and Containment Strategies for COVID-19
Authors: Khadka Sitaram , Saeed Hamid , Bajgain Yogesh , Shahi Janak , Yadav Tank Prasad , Gupta Ravi Prasad
Published: May 2020

Coronavirus disease (COVID-19) is a respiratory infectious ailment caused by severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2). The first outbreak of this disease occurred in China and declared a pandemic in a very short period of time. SARS-CoV-2 gets transmitted mainly through the respiratory tract by droplets or respiratory secretions and by direct contact with the infected person as well as indirect contact through touching the contaminated surface accompanied by poor hygiene practice. Until the vaccine, a therapeutic agent or any other treatment modality gets approved; contact tracing and management, social distancing, personal hygiene, respiratory etiquette, and environmental decontamination are the prime factors to be considered for transmission containment and hence for appropriate safety measures for COVID-19 which is possible with the support of social work from the community level.
Situation of Armillaria spp. and Heterobasidion spp. in Slovenia
Authors: Brglez Ana , Ogris Nikica
Published: May 2020

Species of the genus Armillaria and Heterobasidion are among the most common causes of stem and root rot in Slovenia. Armillaria spp. infects deciduous and coniferous trees, while Heterobasidion spp. mainly threatens Norway spruce (Picea abies), pines (Pinus spp.), and silver fir (Abies alba). On the basis of the data about the sanitary felling of infected trees, we estimated the current state and calculated the proportions represented in total felling, total sanitary felling, total sanitary felling due to diseases, in wood stock, and in increments from 2013 to 2017. Since 2014, there has been a constant increase in the sanitary felling of deciduous and coniferous trees due to infections with Armillaria spp. In 2017, 32,849 m3 of timber were harvested due to Armillaria spp. Given the present situation, we assume that the amount of sanitary felling will continue to increase, but it will not account for large shares in wood stock or increment (< 1 %). In 2017, sanitary felling of infected conifers represented 27.6 % of all sanitary felling due to diseases. In the case of deciduous trees, the share was lower, i.e. 7.1 %. Armillaria spp. was the main cause of sanitary felling due to disease (51.9 %) in the Postojna forest management unit (FMU), while elsewhere shares of up to 10 % were recorded. With Heterobasidion spp., the amount of felling is decreasing over the years. In 2017, 33,922 m3 of wood, accounting for 15.7 % of the total sanitary felling due to disease, were felled due to Heterobasidion spp. A comparison of the felling of Norway spruce, silver fir, and Scots pine due to Heterobasidion spp. shows the different proportions of felling within the total sanitary felling due to the diseases. In Norway spruce, it is on average 79.5 %, in silver fir 12.9 %, and in Scots pine 34.3 %. We assume that the volume of timber harvested due to Heterobasidion spp. will gradually decrease over the years due to the lower wood stocks of Norway spruce, which has recently been hit by numerous natural disasters and infestation of bark beetles. However, the incidence will be higher due to climate change affects.
Identification of Pinus sylvestris clones with highest and lowest allelopathic potential
Authors: Bielinis Ernest , Kwiatkowski Jacek , Boiko Sergii
Published: May 2020

Allelopathy is a kind of interaction between plants in which the inhibitory effect on growth and germination can play an important role during the struggle for existence in interspecific competition. The species (or clone of one species) with a higher allelopathic potential might win the competition and place themselves in a better biosocial position for growth. Also, the clones with a lower allopathic potential might be useful in agroforestry, e.g.  as trees useful for shading the crops. The allelopathic potential of Scots pine (Pinus sylvestris L.), the tree species with a wide range of distribution in Europe and of great economic importance, was estimated in this study. To this end, needles from trees growing in a clonal seed orchard were collected and used as a material to obtain water leachates. The leachates were diluted to 25 and 50% and used in allelopathy tests. The differences between potentials of leachates from Scots pine clones to inhibit germination and growth of the test plant (Sinapis alba L. cv. Borowska) were assessed. The clones 1702 and 1703 were characterized as highly allelopathic, with the potential confirmed in two independent allelopathic tests. The clones 355 and 2209 were characterized as clones with a moderate allopathic potential. The possibility of selecting clones with the known allelopathic potential for the successful use in forestry was discussed.
Manfaat Wind Display di Ruang Control Tower Terkait Keselamatan Penerbangan di Bandar Udara Hang Nadim Batam
Authors: Supardam Dhian , Setiawan Ariyono , Prasetyo Kukuh Tri
Published: May 2020

An Air Traffic Controller professionalism is required in the context of efforts to provide Air Traffic Services in order to create the Five Objectives of Air Traffic Service that affect the parameters of a standard of transport services. The problems underlying the need for certainly the very facility that is in control towers in accordance with ICAO document. The purpose of this final task is to understand how the standard tower control room facilities at Hang Nadim Airport Batam in order to improve the quality of Air Traffic Services. Behind the success of the aviation world, especially in the Hang Nadim airport Batam is inseparable from the important role of aviation-related units one of which is a wizard Air Traffic Controller (ATC). ATC has a responsibility in the provision of Air Traffic Services as outlined in the Five Objectives of Air Traffic Service. Behind the success of ATC in the provision of air traffic services can not be separated from the facilities that support their work performance, especially in space where ATC Control Tower provides Air Traffic Services. Batam's Hang Nadim Airport has great potential to become an airport that could benefit Indonesia in the world of aviation. However, it is hampered by the lack of wind facilities in the display space control tower as the air traffic service requirements as listed in Annex 11 ATS chapter 7. Air Traffic Service requirements for information point 7.1.4.3 stating that ATC should provide the information contained wind conditions at the site by looking at the wind display. On this thesis research to try to conduct research on the need for improved facilities and the unavailability of the space control tower is deemed not a standard by the applicable ICAO documents. Associated with an increase in the provision of Air Traffic Services at Hang Nadim Airport Batam
Rancangan Interface Komunikasi Data Aeronautical Fixed Telecomunication Network Menggunakan GSM Gateway Berbasis Arduino
Authors: Ilyas Moch. , Suprapto Yuyun , Warsito Totok , P. Romma Diana
Published: May 2020

The design of data transmission is made with the intention of later as media data delivery AFTN at low cost, utilizing the network provider using the GSM GATEWAY will get a solution to the problem of how to transmit data AFTN when an aerodrome does not have the means of VSAT and the airport does not have a network AFTN. The working principle of this circuit is to change the output signal DB9 serial port on the teleprinter news format ITA2 (5n1) is converted to the module MAX3232 to be transformed into TTL voltage level, which is a TTL input data that can be processed by a microcontroller Arduino Mega 2560. Output of Arduino Mega was converted back to the module MAX3232 from TTL to Serial, then the data is then converted digital signal into an analog signal by using Wavecom M1306B Modem Serial Q2406B. This analog signal is then sent to the destination. Once the information from the transmitter wavecom analog signal received by the receiver with wavecom modem, the signal is converted back by module MAX3232 Serial to TTL which will be connected to the Arduino Uno microcontroller and connected with a PC software in which there are accepted as news ticker
Pengaruh Pengaturan Air Fuel Ratio Terhadap Torsi dan Daya Mesin Bensin Berbahan Bakar Premium-Compressed Natural Gas
Authors: Junipitoyo Bambang
Published: May 2020

Sehubungan rendahnya nilai karakteristik dan ditunjukkan pada propertisnya dari compressed natural gas (CNG) dibandingkan dengan premium, maka berdampak penurunan performa engine yang berbahan bakar asal premium.

Oleh karena itu perlu dilakukan penelitian pada engine Bensin 2 silinder 650 cc pada variable speed 2000 - 5000 rpm dengan interval 500 rpm, metode yang digunakan untuk mengetahui nilai settingan yang optimum adalah dengan mengatur air fuel ratio (AFR). Durasi injeksi yang digunakan pada penelitian ini sebesar 6 ms melalui mapping pada software AC GAS SYNCHRO 9.1.0. Sedangkan pengaturan AFR dilakukan dengan menambahkan suplai udara melalui blower dan melakukan pengukuran dengan AFR meter berdasarkan kriteria settingan durasi injeksi pada setiap putaran engine.

Hasil penelitian ini menunjukkan bahwa melalui pengaturan durasi injeksi dan nilai AFR yang tepat pada engine Bensin berbahan bakar CNG terjadi pada durasi injeksi 6.6 ms dengan penambahan suplai udara pada saluran intake. Hasil yang didapatkan pada pengaturan ini adalah nilai torsi, daya, secara berturut turut sebesar 41,83 Nm, 16,4 kW atau mengalami kenaikan sebesar 1,22 %, 1,12 % terhadap premium. Nilai efisiensi thermal menurun masing-masing sebesar 21,48 %
Rancang Bangun Sistem Proteksi Generator Sinkron 3 Phasa Terhadap Arus Beban lebih dan Drop Tegangan Berbasis Mikrokontroler Arduino
Authors: Sudjoko Rifdian , Hartono Hartono
Published: May 2020

Proteksi pada generator sinkron 3 phasa meliputi proteksi arus, tegangan, frekuensi dan putaran. Pada penelitian ini difokuskan pada rancangan proteksi arus beban lebih dan proteksi drop tegangan pada generator. Sistem proteksi ini merupakan sistem proteksi generator yang menggunakan arduino sebagai pengolah data yang dibaca oleh sensor arus dan tegangan. Apabila pembacaan pada sensor arus dan tegangan melebihi dari batasan yang disetting, maka secara otomatis suplai daya dari sumber terputus. Sehingga dapat melindungi motor dan generator dari kerusakan. Pemutusan suplai daya tersebut menggunakan kontaktor yang terhubung dengan relay. Relay ini dikontrol oleh arduino. Untuk penyetingan arus digunakan rumus dengan melalui perhitungan didapat setpoint untuk arus sebesar 1,43 Ampere. Nilai arus ini adalah 110% dari arus nominal generator. Setting tegangan per phasa diperoleh melalui perhitungan, sehingga didapat tegangan drop yang diperbolehkan adalah sebesar 198 volt. Tegangan drop ini adalah sebesar 10% dari tegangan nominalnya yaitu sebesar 220 volt.
Rancang Bangun “Pencatat Kebugaran Tubuh” Berbasis Indeks Masa Tubuh
Authors: Setiawan Ariyono , Susrama I Gede , Kholis Moch
Published: May 2020

Aplikasi pencatat kebugaran tubuh adalah suatu aplikasi yang dapat membantu pengguna dalam memantau berat badan seseorang. Tujuan dari pembuatan aplikasi pencatat kebugaran tubuh ini yaitu dapat mempermudah pengguna untuk mengetahui nilai dari indeks massa tubuh, tingkat metabolisme, kadar air, berat badan ideal, dan kategori berat badan berdasarkan indeks massa tubuh. Pada saat ini beberapa orang masih mengukur berat badan dengan cara menggunakan media kalkulator dalam menghitung berat badan, dari kasus diatas maka dibuatlah perhitungan untuk mendapatkan sebuah indeks massa tubuh yang diiniginkan dengan menggunakan perhitungan Body Mass Index (BMI) dan Basal Metabolisme Rate (BMR). Dengan adanya perhitungan tersebut dapat dihasilkan tingkat kebugaran tubuh berdasarkan dari nilai BMI, apakah masuk kedalam kategori kurus, normal, gemuk, ataupun obesitas. Dari hasil peneliitian tersebut dapat dianalisa dan dikembangkan menjadi beberapa funsionalitas meliputi aplikasi mampu menghitung nilai dari indeks massa tubuh, berat badan ideal, angka metabolisme, dan kadar air yang terdapat pada tubuh. Kemudian pada menu histori ini user akan ditampilkan sebuah list view yang berfungsi untuk melihat berat badan sesuai dengan tanggal yang telah diinputkan.
Analisa Efisiensi Generator pada Generator Sinkron Tiga Fasa dengan Penggerak Turbin Angin
Authors: I.S Rifdian , Hartono Hartono
Published: May 2020

Penelitian ini bertujuan mengembangkan pembangkit listrik tenaga bayu sebagai sumber energi alternatif untuk menghasilkan energi yang efisien, efektif dan handal. Alat ini dapat dimanfaatkan untuk memenuhi kebutuhan energi di daerah belum dijangkau PLN dan tidak berpengaruh terhadap cuaca sehingga dapat menghasilkan energi yang optimal. Alat ini dibuat dalam beberapa tahapan yaitu (1) verifikasi potensi kecepatan dan arah angin, (2) rencana penggunaan beban, (3) generator yang digunakan, dan (4) tahap uji generator. Tahap uji generator terdiri dari: (1) uji tahann isolasi, (2) pengujian polarisasi index, (3) pengujian tegangan lebih (4) pengujian step voltage. Alat ini bekerja menggunakan generator AC 3 phase. Salah satu jenis generator generator adalah generaror arus bolak balik untuk mengubah tenaga makanis menjadi tenaga listrik. Sumber penggerak dari generator tersebut menggunakan sumber energi angin. Berdasarkan hasil pengujian yang telah dilaksanakan maka dapat disimpulkan bahwa alat kincir Angin ini dapat bekerja dengan baik. Hal tersebut ditunjukan oleh hasil uji alat dengan baik dan data dapat terpenuhi. Efisiensi generator maksimum dan minimum yang dihasilkan berturut-turut adalah 20,68% dan 3,10%.
SISTEM PENGENALAN WAJAH BERBASIS JARINGAN SYARAF TIRUAN SELF ORGANIZINGMAP (SOM) DENGAN PEMROSESAN AWAL DISCRETE COSINE TRANSFORM (DCT)
Authors: Moonlight Lady Silk
Published: May 2020

Citra wajah merupakan salah satu fitur biometrik yang dapat dijadikan sebagai bukti autentik dari seseorang. Sistem pengenalan wajah (Face Recognition) secara komputerisasi, akan mengetahui identitas diri seseorang. Dalam proses pelatihan citra wajah, penggunaan piksel dari citra wajah secara langsung dapat mengakibatkan banyaknya fitur-fitur wajah yang tidak dapat terekstraksi dengan baik. Maka dari itu diperlukan suatu pemrosesan awal yang dapat mengekstraksi fitur-fitur wajah dengan baik. Dimana pada penelitian ini digunakan Discrete Cosine Transform (DCT) sebagai pemrosesan awal dan Penggunaan Jaringan Syaraf Tiruan Self Organizing Map (SOM)/Kohonen dalam proses pelatihannya. Dengan menggunakan DCT jaringan akan cepat belajar dan dapat mengenali citra dengan kesalahan yang minimum sehingga didapatkan sistem yang dapat bekerja cukup baik dan efisien.
DESAIN ANTENA MIKROSTRIP UNTUK ALTERNATIF ANTENA SIDEBAND DVOR (DOPPLER VHF OMNIDIRECTIONAL RANGE)
Authors: Warsito Totok , Suprapto Yuyun , Margono Margono , Diana Romma
Published: May 2020

Antena merupakan salah satu perangkat penting yang ada pada sistem navigasi Doppler VOR (DVOR). Saat ini pengembangan antena dengan biaya produksi rendah menjadi salah satu alternatif tujuan para peneliti. Salah satu teknologi yang banyak digunakan sebagai solusinya adalah antena berbasis mikrostrip. Sebab antena berbasis mikrostrip menawarkan biaya produksi yang sangat rendah dibandingkan dengan jenis antena lain. Antena yang dipakai pada sistem DVOR saat ini adalah antena Alford Loop. Pada penelitian ini dilakukan perancangan antena mikrostrip rectangular dengan pencatuan coaxial sebagai alternatif antena DVOR yang bekerja pada frekuensi VHF (frekuensi 108-118 MHz), sehingga hal ini memungkinkan biaya produksi yang lebih murah dibandingkan antenna Alford Loop pada umumnya. Perancangan dan simulasi antena dilakukan menggunakan software CST Microwave Studio menggunakan material FR-4 dengan konstanta dielektrik (). Hasil perancangan dan simulasi antena menunjukkan return loss (S11) sebesar -16.1 dB dan gain sebesar 4 dB pada frekuensi 113 MHz. Dari hasil simulasi juga dapat diketahui bahwa memiliki polarisasi linier horizontal dan polaradiasi yang bersifat omni-directional.
Promoting gender sensitivity: Disaster risk reduction in Pakistan
Authors: Zeeshan Afsheen , Khan Muhammad Bashir
Published: May 2020

Gender sensitization is a theory that a maximum number of policy analysts discover easy to implement, but very few perform well. The same can be said about disaster risk reduction. When these two concerns are put together to mainstream gender into disaster risk reduction (DRR), concerned organizations and experts find gaps in planning and implementation of policies. This is not because the job is integrally challenging; rather, there is not adequate practical guidance and pragmatic information. This paper aims to increase awareness about gender issues in disaster risk reduction, to improve government capability to address gender problems in DRR and to encourage Pakistan’s government to incorporate gender perception into DRR legislatures, strategies and plans for sustainable development. The importance of the Beijing Agenda for global action on gender sensitive DRR and the Manila Declaration for Global Action on gender in climate change and DRR have been highlighted, with the help of information from other developing countries, to develop a road map for Pakistan. Capacity development and gender-aware knowledge products are the two main areas with the help of which concerns regarding gender sensitivity can be addressed in disaster preparedness, recovery and rehabilitation.
Marital satisfaction of breast cancer patients and their spouses: A qualitative study
Authors: Mushtaq Nudrat , Ali Rabia
Published: May 2020

This study is part of a larger PhD research project on marital satisfaction of Breast Cancer Patients and their spouses in the Discipline of Sociology. The study was conducted by using a mixed method design. An interpretative research approach was used to collect data from 12 couples confronting breast cancer to unveil their experiences of marital satisfaction, while data from 279 couples were taken through a survey. In this paper the qualitative finding will be presented to highlight the couples’ nuanced experience as a consequence of their diagnosis. The findings reveal that the majority of participants experienced distress in their marital relationship. Breast cancer-confronting couples stated that breast cancer affected their intimate and /sexual relationship, besides acquainting them with individual psychological and mutual spousal issues. Difficulties in dealing with physical deformity and psychological effects resulting from breast cancer, and the ways these changes influenced their marital satisfaction, were observed by a majority of the participants. The findings suggest that couples with strong emotional bonding and understanding dealt with these consequences in a better way.
Parkia speciosa (Petai) pod as a potential low-cost adsorbent for the removal of toxic crystal violet dye
Authors: Lim Linda Biaw Leng , Priyantha Namal , Cheng Hui Hsin , Hazirah Nur Afiqah
Published: May 2020

This study focused on the use of Parkia speciosa (Petai) pod as a potential adsorbent for the removal of crystal violet (CV) dye. Batch adsorption isotherm experiments carried out under optimized conditions were fitted to six isotherm models, namely Langmuir, Freundlich, Temkin, Dubinin-Radushkevich, Redlich-Peterson and Sips. Of these, the Sips model best described the adsorption isotherm of Petai pod for the removal of CV dye, giving a desirable adsorption capacity (qmax) of 163.2 mg g-1. Adsorption kinetics was found to follow the pseudo-second order, and further, intra-particle diffusion played a significant role. This study also revealed that the adsorption of CV by Petai pod is influenced by the ionic strength of the medium. However, Petai pod showed resilience towards changes in medium pH.
Adsorption characteristics of pomelo skin toward toxic Brilliant Green dye
Authors: Dahri Muhammad Khairud , Kooh Muhammad Raziq Rahimi , Lim Linda B. L.
Published: May 2020

Pomelo skin was investigated for its adsorption ability toward Brilliant Green dye. An hour of shaking time was sufficient for the adsorbate-adsorbent system to reach equilibrium. Of the three isotherm models (Langmuir, Freundlich and Sips) used to fit the experimental data, the adsorption was best described by the Freundlich model, indicating multi-layer adsorption onto a heterogeneous surface, followed by the Sips and the Langmuir models. Adsorption was exothermic in nature and kinetics was best described by the pseudo second order and pore diffusion was found to be not the rate determining step. No adjustment of medium pH was required throughout the study and pomelo skin was able to maintain good adsorption capability under various ionic strength. Successful regeneration and reusability of spent pomelo skin, coupled with high maximum adsorption capacity (qmax) of 325 mg/g (Langmuir) and 400 mg/g (Sips) compared with many reported adsorbents, make pomelo skin a potential candidate to be considered in real life application of wastewater remediation.
Molecular dynamics study of diffusion of xenon in water at different temperatures
Authors: Kumar Niraj , Adhikari Narayan Prasad
Published: May 2020

Molecular Dynamics simulation was performed using 2 xenon atoms as solute and 300 water molecules as solvent. We have studied the structural properties as well as transport property. As structural properties, we have determined the radial distribution function (RDF) of xenon-xenon, xenon-water, and water-water interactions. Study of RDF of xenon-xenon and oxygen-oxygen interactions of water shows that there is hydrophobic behavior of xenon in the presence of water. We have studied the self diffusion coefficient of xenon, water, and mutual diffusion coefficients of xenon in water. The self diffusion coefficient of xenon was estimated using both mean-squared displacement (MSD) and velocity autocorrelation function (VACF), while only MSD was used for water. The temperature dependence of the diffusion coefficient of xenon and water were found to follow the Arrhenius behavior. The activation energies obtained are 12.156 KJ/mole with MSD and 14.617 KJ/mole with VACF in the temperature range taken in this study.
Gastropod diversity at Pulau Punyit and the nearby shoreline – a reflection of Brunei’s vulnerable rocky intertidal communities
Authors: Marshall David J. , Aminuddin Azmi , Pg Hj Ahmad Pg Saimon
Published: May 2020

Pulau Punyit (PPUN), a small islet on the South China Sea coastline of Brunei Darussalam, represents a significant portion of the country’s natural rocky-shore ecosystem. We carried out a rapid survey of the intertidal gastropod species richness at PPUN, and compared this with species richness at other nearby natural and artificial rocky shores [Tungku Punyit (TPUN), Pantai Jerudong (PJER), Jerudong Park Medical Centre (JPMC) and Pantai Tungku (TUNK)]. A total of thirty two (32) species were collected from all of the shores. Species richness was greatest at the two natural shores studied (numbering 21 and 22 species at PPUN and TPUN, respectively), while the artificial shores were relatively depauperate. The natural shores however differed in species composition, abundance and body size of gastropods. These attributes varied with shore height, and appeared to relate to height-specific differences in abiotic stresses at the shores - at PPUN the high-shore is more exposed to the wind and sun, whereas at TPUN the mid-shore experiences greater sedimentation and mainland acidic seepage. Faunistic differences between the artificial and natural shores (Bray-Curtis similarity analysis) seemingly associate more closely with degree of habitat availability and abiotic stress than with shore proximity. We conclude that the country’s rocky intertidal biodiversity, as reflected by the gastropod diversity, is mainly constituted by the natural rocky shore system. Because this is spatially constrained and vulnerable to locality-specific environmental stresses, this diversity is threatened and deserving of greater protection status.
Linking Geostatistical Methods: Co-Kriging – Principal Component Analysis (PCA); with Integrated Well Data and Seismic Cross Sections for Improved Hydrocarbon Prospecting (Case Study: Field X)
Authors: Andika Ryan Bobby , Dewi Haritsari
Published: May 2020

In this era of globalization, the demand for energy is rising in tandem with social and economic development throughout the world. Current hydrocarbon demand is much greater than domestic crude oil and natural gas production. In order to bridge the gap between energy supply and demand, it is imperative to accelerate exploration activities and develop new effective and efficient techniques for discovering hydrocarbons. Therefore, this study presents a new method for integrating seismic inversion data and well data using geostatistical principles that allow for the high level of processing and interpretation expected nowadays. The main part of this paper will concern the preparation and processing of the input data, with the aim of constructing a map of hydrocarbon-potency distribution in a certain horizon. It will make use of principal component analysis (PCA) and the co-kriging method. In the case study of Field X, we analyze a single new dataset by applying PCA to every existing well that contains multivariate rock-physics data. The interpretation that can be extracted from the output gives us information about the hydrocarbon presence in a particular depth range. We use that output as our primary dataset from which our research map is constructed by applying the co-kriging method. We also rely on an acoustic impedance dataset that is available for a certain horizon to fulfill the co-kriging interpolation requirement. All of the acoustic impedance data and output data that result from the application of PCA in a particular horizon give strong correlation factors. Our resulting final map is also validated with information from proven hydrocarbon discoveries. It is demonstrated that the map gives accurate information suggesting the location of hydrocarbon potency, which will need some detailed follow-up work to enhance the distribution probabilities. This method can be considered for hydrocarbon prediction in any area of sparse well control.
Phytochemical characterization of chloroform seed extract from Schinus molle collected in the Kingdom of Lesotho
Authors: Pillai Manoharan Karuppiah , Matela Kemelo Sanett , George Mosotho Joseph , Young David James
Published: May 2020

Chloroform seed extract from Schinus molle was analyzed for its phytochemical compositions by GC-MS. A total of 38 compounds were identified. S. molle has therapeutic applications in traditional medicine. Essential oils obtained from various parts of this plant are reported to have promising biological and pharmacological activity.
Amphibian species diversity in the proposed extension of the Bukit Teraja Protection Forest, Brunei Darussalam
Authors: Ahmad Sah Hanyrol H. , Grafe T. Ulmar
Published: May 2020

Amphibian species diversity was investigated within the lowland mixed-dipterocarp forest of the proposed extension of the Bukit Teraja Protection Forest (BTPF), Brunei Darussalam in north-west Borneo. A combination of both visual encounter and acoustic sampling techniques were conducted opportunistically as well as in six selected stream transects, each containing five 5x10m plots. A total of 39 species of frogs from seven families (Bufonidae, Ceratobatrachidae, Dicroglossidae, Megophryidae, Microhylidae, Ranidae, and Rhacophoridae) were identified from the BTPF. Most notably, four new records for Brunei were discovered: Hylarana nicobariensis, Kaloula baleata, Limnonectes malesianus, and Microhyla perparva. This brings the total number of amphibian species in Brunei Darussalam to 84. Canonical correspondence analysis showed that out of 13 measured environmental variables maximum stream depth and % soil/sand of ground cover were significantly correlated with anuran assemblage composition. Species overlap between the proposed extension of the Bukit Teraja Protection Forest and the Ulu Temburong National Park (UTNP) determined by the coefficient of biogeographic resemblance (CBR) showed low species complementarity between these two regions. This emphasizes the need to upgrade the proposed extension of the BTPF to a protection forest to ensure the conservation of regional amphibian biodiversity.
Reconnaissance geochemical and geophysical exploration for gold at Iri gold field, north central Nigeria
Authors: Aliyu Ahmed Sidi , Waziri Nuhu Musa , Mohammad Hadiza Liman , Mohammed Mohammed Abubakar , Gideon Apeh Aromeh
Published: May 2020

Reconnaissance geochemical and geophysical exploration for gold was carried out at IRI Gold field. Geological mapping was conducted and rocks, soils and sediments samples were collected. The outcome revealed rocks of the basement complex of Nigeria made up of mainly, Migmatite Gneiss, Older Granite and the Schist. The major lithology in the area is silicified sheared rocks and large quartz vein. Isolated occurrence of undifferentiated schist was found as parent material on which quartzite intruded possibly during a major geological activity. Shattering of the rocks left boulders and rubbles of quartzite all around two major ridges within the study area. The rocks have shown weak geochemical anomaly except in two locations were positive anomalies were observed and identified as target for further exploration. Gold veins are prominent in the area suggesting potential gold mineralization. Interpretation of the aeromagnetic data give the orientations of the structural features, the major structural trend in the area is NE-SW. The lineaments extracted from the magnetic data range in length from 46.43m to about 1251.66m. Most of the lineaments extracted from the area are subsurface within the quartz-mica and migmatites while some of them have surface expressions even though not clearly defined. These magnetic lineaments could be the contacts between two rock types of contrasting magnetic   susceptibility   or   edges   of   structures   that   could   be faults or intrusive bodies. Interpreted satellite data show several subsurface structures which could be hosts to gold mineralization in the area. Results of the geochemical analysis of rocks, soils and sediments were super imposed on the interpreted aeromagnetic data and similar geochemical and geophysical signatures were established.

 

Index Terms: Gold mineralization, aeromagnetic data, geochemical data, schist belt, Nigeria
Tingkat Keunggulan Komparatif dan Kompetitif Anggrek Indonesia di Pasar Jepang
Authors: Harniati Harniati , Jamil Ahmad Syariful
Published: May 2020

Sebagai negara dengan tingkat biodiversitas terbesar kedua di dunia, Indonesia memiliki potensi florikultura yang melimpah. Potensi tersebut antara lain potensi agroklimat, keragaman jenis, lahan, teknologi dan sumber daya manusia. Oleh karena itu, penelitian ini bertujuan untuk menganalisis daya saing ekspor anggrek Indonesia di pasar Jepang. Data perdagangan (ekspor) anggrek Indonesia dengan kode pos tarif/ HS 0602 digunakan untuk menjawab tujuan penelitian. Revealed Symmetry Comparative Advantage (RSCA) dan Export Competitiveness Index (ECI) masing-masing digunakan untuk menganalisis keunggulan komparatif dan kompetitif. Indonesia memiliki pangsa ekspor lebih rendah dibandingkan dengan negara eksportir lainnya. Indeks RSCA menunjukkan bahwa Indonesia bersama dengan negara eksportir lainnya tidak memiliki keunggulan komparatif di pasar anggrek Jepang. Relatif tidak berdaya saingnya negara eksportir tersebut secara komparatif mengindikasikan bahwa pasar anggrek Jepang relatif kompetitif. Berbeda halnya dengan keunggulan komparatif, Indonesia memiliki keunggulan kompetitif. Kondisi tersebut mengindikasikan bahwa anggrek Indonesia memiliki daya saing kompetitif dalam berkompetisi dengan negara eksportir lainnya. Untuk meningkatkan daya saing anggrek Indonesia diperlukan pengembangan sistem informasi khsusnya dalam melakukan promosi ke pasar tujuan. Promosi yang gencar diperlukan untuk menciptakan peluang pasar baru bagi anggrek Indonesia.
Ketersediaan Hara Makro Pada Beberapa Sistem Manajemen Lahan Sawah Serta Produksi Tanaman Padi (Oryza sativa L.)
Authors: Safitri Lilian
Published: May 2020

Untuk mengetahui ketersediaan hara makro berupa nitrogen (N), fosfor (P), dan kalium (K) pada lahan sawah dengan sistem manajemen lahan yang berbeda, maka telah dilakukan penelitian di Jorong Air Hangat Nagari Tanjung Betung Kecamatan Rao Selatan, Kabupaten Pasaman-Sumatera Barat. Penelitian ini menggunakan metode komparatif dengan membandingkan ketersediaan hara makro yang ada pada lahan sawah yang dikelola secara tradisional (mengolah dengan menggunakan tajak/cangkul), transisi (peralihan dari tradisional ke modern), dan modern (mengolah dengan menggunakan mesin traktor). Pada masing-masing lahan diambil sampel melalui profil dan ring sampel dengan kedalaman 0-10, 10-20, 20-30, 30-40, dan 40-50 cm menunjukan hasil yang berbeda signifikan dan mempengaruhi karakteristik tanah. Pada manajemen tradisional, kandungan C organik mencapai 176.63 ton/ha, N-total sebesar 7.95 ton/ha, P2O5 sebesar 0.36 ton/ha, dan K2O sebesar 19.43 ton/ha. Pada lahan yang dikelola secara modern, kandungan C-organik mengalami penurunan sebesar 47.46 % (92.79 ton/ha) dan kandungan kalium juga mengalami penurunan sebesar 20.50 % (15.12 ton/ha). Sebaliknya, kandungan N total mengalami peningkatan sebesar 9.03 % (8.74ton/ha) dan P2O5 sebesar 14.28 % (0.42 ton/ha) yang merupakan indikasi rendahnya kualitas lahan untuk musim tanam selanjutnya sehingga dibutuhkan input yang banyak untuk musim tanam selanjutnya. Sedangkan pada lahan transisi hanya sedikit terjadi perubahan kualitas hara tanah. Hasil penelitian juga menunjukkan rendahnya produksi tanaman padi pada lahan tradisional (3.40 ton/ha) jika dibandingkan modern (5.40 ton/ha) sehingga perbaikan kualitas lahan dapat dilakukan dengan penambahan pupuk kimia setengah rekomendasi pada lahan tradisional dan penambahan ameliorant pada lahan modern.
Turn-On Eco-Quotient, A Step to Sustainable Fashion
Authors: R Mohana Priya
Published: May 2020

The textile and fashion industry are a huge industry with the multiple sectors which use multifold resources to meet the needs of the customers. The fast fashion has ended up with more environment threats. The sustainable fashion is the solution to minimize the ecological impacts and reduce the resources and wastes. It focuses on how the product can stay during its entire life cycle with less impact to the environment. It is big challenge to be sustainable textile and fashion sector because of non-vertical business model
Preliminary Investigation of Utilization of a Cellulose-Based Polymer in Enhanced Oil Recovery by Oilfield Anaerobic Microbes and its Impact on Carbon Steel Corrosion
Authors: Yang Dongqing , Jia Ru , Abd Rahman Hasrizal Bin , Gu Tingyue
Published: May 2020

Water injection increases reservoir pressure in enhanced oil recovery (EOR). Among other oilfield performance chemicals, an EOR polymer is added to the injection water to provide the viscosity necessary for effective displacement of viscous crude oil from the reservoir formation. However, these organic macromolecules may be degraded by microbes downhole, causing undesirable viscosity loss. The organic carbon utilization by the microbes promotes microbial metabolism, thus potentially exacerbating microbiologically influenced corrosion (MIC). In this preliminary laboratory investigation, 3,000 ppm (w/w) carboxymethyl cellulose sodium (CMCS), a commonly used EOR polymer, was found to be utilized by an oilfield biofilm consortium. This oilfield biofilm consortium consisted of bacteria (including that can degrade large organic molecules), sulfate-reducing bacteria (SRB), and other microorganisms. A 30-day incubation in 125 mL anaerobic vials was conducted with an artificial seawater medium without yeast extract and lactate supplements at 37°C. The polymer biodegradation led to 16% viscosity loss in the broth and a 30× higher SRB sessile cell count. Slightly increased MIC weight loss and pitting corrosion were observed on C1018 carbon steel coupons. Thus, the use of CMCS in EOR should take into the consideration of microbial degradation and its impact on MIC.
Classe, cor e etnia nas legislações de compulsão ao trabalho na Amazônia: do Diretório ao fim dos Corpos de Trabalhadores (1755-1859)
Authors: Paz Adalberto
Published: May 2020

Desde o final do século XVIII, diferentes administrações portuguesas e brasileiras se ocuparam em criar mecanismos de compulsão ao trabalho voltados às populações não legalmente escravizadas na Amazônia. Após a abolição do cativeiro de povos indígenas, em 1755, sucessivas legislações buscaram estabelecer rígidas bases oficiais (não raramente exasperadas pelas práticas cotidianas de coerção) para que os pobres livres e libertos, sobretudo índios, negros e mestiços, fossem obrigados a realizar atividades laborais tanto em serviços e obras públicas, quanto para particulares. Esses trabalhadores eram empregados em funções econômicas fundamentais tais como transporte, extrativismo, lavoura, comércio, entre outros, num cenário em que a presença de escravos negros era significativamente menor do que em outras regiões do país. A partir disso, pretende-se analisar de que modo as autoridades públicas e agentes privados articularam formas legais visando impelir os pobres livres e libertos ao trabalho, e como tais instrumentos buscaram regular e naturalizar diferenças de origem étnicas e sociais objetivando a máxima retenção e controle de toda força de trabalho não escrava disponível na Amazônia no século XIX. Igualmente serão enfatizados os modos pelos quais essas populações vivenciaram, reagiram e se opuseram a tais  investidas legais contra sua liberdade, mobilizando-se por meio de fugas, organizando-se politicamente em áreas de disputas fronteiriças e fazendo uso dos recursos naturais não apenas para sua sobrevivência, mas também para a reafirmação da sua autonomia sociocultural e econômica.
Aparelhos de apoio fretado de neoprene: Uma revisão
Authors: Lan Rian De Oliveira
Published: May 2020

Este artigo tem como objetivo tecer considerações sobre os aparelhos de apoio fretado de neoprene. São abordadas as vantagens, limitações, metodologias para o seu dimensionamento, principais patologias e serviços de manutenção e substituição desses dispositivos. Verifica-se que para aperfeiçoar o conjunto sistematizado e buscar o domínio do conhecimento sobre apoios em elastômero são necessários estudos árduos a respeito de sua fabricação, dos componentes químicos constituintes, o funcionamento das chapas fretantes, as curvas reométricas de vulcanização, seus respectivos ensaios de qualidade, o ensaio de compressão com força horizontal, seus respectivos posicionamentos na obra, bem como uma norma brasileira específica para o dimensionamento destes dispositivos.
Avaliação de desempenho hidráulico de sarjetas no sistema de drenagem urbana: um estudo no bairro Aldeota, em Fortaleza (CE)
Authors: Florêncio da Cunha Teixeira Lucas , De Sousa Meneses Filho Anísio
Published: May 2020

Este trabalho se destina a realizar uma avaliação da capacidade hidráulica de sarjetas urbanas no quesito de condução de águas pluviais considerando duas situações distintas: a de projeto, em que são obedecidos os parâmetros hidráulicos e hidrológicos de dimensionamento, e aquela encontrada em campo, onde são observadas diversas intervenções que desfiguram este elemento e, portanto, prejudicam a sua capacidade de condução requerida. Dessa forma, foi selecionada uma área composta por oito quadras no bairro Aldeota, em Fortaleza (CE), com alta densidade demográfica. Foram feitas visitas à área de estudo para locação das bocas-de-lobo e à Secretaria de Infraestrutura de Fortaleza para obtenção de material cartográfico para dar suporte à realização dos cálculos. Com esses dados, foram feitos os cálculos de vazão limite para as duas situações, podendo-se observar que, com a simulação das intervenções encontradas em campo pela redução da área transversal das sarjetas, a área pretensamente drenada passa a ter maior risco de alagamento. Assim, evidencia-se que a execução física em estrita conformidade ao projeto constitui fator determinante para o seu efetivo desempenho.