bluuebunny/crossref_metadata_2025_split huggingface dataset:
ANALISIS INDIKATOR UTAMA PENGELOLAAN HUTAN MANGROVE BERBASIS MASYARAKAT DI DESA CURAHSAWO KECAMATAN GENDING 1 KABUPATEN PROBOLINGGO
Authors: Harahab Nuddin , P Graziano Raymond 
Published: July 2017

Hutan mangrove merupakan salah satu sumber daya pesisir yang berperan penting dalam pembangunan ekonomi. Pengelolaan hutan mangrove berbasis masyarakat merupakan salah satu strategi pengelolaan yang dapat meningkatkan efisiensi dan keadilan dalam pemanfaatan dan pengelolaan sumber daya alam. Indikator penting dalam keberhasilan pengelolaan hutan mangrove adalah partisipasi masyarakat. Ada banyak variabel yang diperkirakan saling berinteraksi dan berkorelasi dalam partisipasi masyarakat tersebut. Oleh karenanya penelitian ini dilakukan untuk menganalisis dan menentukan indikator utama dalam pengelolaan hutan mangrove berbasis masyarakat. Penelitian ini menggunakan metode analisis Principle Component Analysis (PCA). Hasil analisis faktor menggunakan SPSS menunjukkan bahwa dari 15 (limabelas) variabel yang dianalisis diperoleh tiga indikator utama partisipasi masyarakat dalam pengelolaan hutan mangrove di Kecamatan Gending, yaitu faktor manajemen, pengetahuan, dan sikap. Tittle: Analysis of Main Indicator in the Community-Based Management of Mangrove Forestry in the Curahsawo Vilage Subdistrict Gading, Probolinggo RegencyMangrove forest is among coastal resources that has essential role in economic development. Community - based mangrove forest management is a strategy to improve efficiency and fairness in theuse and management of natural resources mangrove forest.Important indicators in successing mangrove forest management is a community participation. There are many variables which were expected to interact with each other and correlated in community participation. Then study was conducted to analyze and determine primary indicators in community-based management of mangrove forestry. Method Principle Component Analysis (PCA) was used in this study. Results from factor analysis of 15 variables using SPSS shows that 3 major indicators of public participation in the mangrove forest management in district Gending are factor, knowledge and attitude.
TINGKAT KESEJAHTERAAN DAN KETAHANAN PANGAN RUMAHTANGGA NELAYAN MISKIN: Studi Kasus di Kelurahan Marunda Baru, DKI Jakarta dan Desa Tanjung Pasir, Banten
Authors: Tajerin Tajerin , Sastrawidjaja Sastrawidjaja , Yusuf Risna 
Published: July 2017

Tujuan penelitian ini adalah untuk mengetahui hubungan tingkat kesejahteraan dengan ketahanan pangan rumahtangga nelayan miskin di perkotaan (kasus Kelurahan Marunda, Kota Jakarta Utara) dan perdesaan (kasus Desa Tanjung Pasir, Kabupaten Tangerang). Penelitian dilakukan dengan metoda survey dengan menggunakan data primer dan dianalisis berdasarkan pendekatan statistik non-parametrik korelasi Rank-Spearman. Hasil penelitian menunjukkan bahwa terdapat hubungan yang positif dan nyata antara tingkat kesejahteraan dengan ketahanan pangan rumahtangga nelayan miskin di perkotaan maupun perdesaan. Selain itu terdapat hubungan yang positif dan nyata: (1) Antara kesehatan dan gizi dengan pemanfaatan pangan dan akses pangan; (2) Antara kekayaan materi dengan akses pangan dan pemanfaatan pangan; dan (3) Antara pengetahuan dengan ketersediaan pangan, akses pangan dan pemanfaatan pangan. Tampak bahwa aspek pengetahuan merupakan faktor terpenting dalam meningkatkan ketahanan pangan rumahtangga nelayan miskin, di samping faktor kesehatan dan gizi, dan faktor kekayaan materi. Oleh karena itu, kebijakan peningkatan ketahanan pangan pada rumahtangga nelayan miskin dapat diarahkan dengan memberikan perioritas pada peningkatan pengetahuan yang dimiliki rumahtangga nelayan tersebut, dan tentunya dengan meningkatkan aspek pangannya terutama melalui perbaikan jaringan distribusi bahan pangan. Tittle: Welfare Level and Food Security at Poor Fisher’s Household.The objective of this research is to assess the relationship of welfare level and food security at urban poor fisher household (case study at Village of Marunda - North Jakarta) and rural (Village of Tanjung Pasir –Regency of Tangerang). The research used survey method with primary data and analized by using non-parametric approach with rank-speraman correlation. Result showed that there were positive and significant relationship between welfare level with food security at poor fisher household both of urban and rural. Beside that there was positive and significant relationship: (1) between health and nutrition with using of food and accessibility of food; (2) between wealth with using of food; and (3) between availability of food, accessibility and using of food. In additional, knowledge aspect was the important factor in term of increasing of food security beside health and nutrition factor and wealth factor. Therefore, the policy for increasing of food security for poor fishers household can be focused on not only increasing of knowlegde of fisher but also increasing of accessibility of food especially by recovery of channel material food.
The Difference Culture Makes
Authors: Wason Paul K 
Published: July 2017

The dawn of culture and its subsequent elaboration is one of the most important developments in the history of life. It is now recognized that culture, at least in a minimalist sense of behavioral traditions shaped by social learning, is found widely throughout the animal kingdom. And this fact, perhaps ironically for those of a reductionist bent, has made possible new understandings of just how distinctive humans are, especially in terms of symbolic thought, cooperativity far beyond genetic relatedness, the cumulative nature of our cultures, and our pervasive sense of transcendence. Yet, nearly 150 years after Tylor’s Primitive Culture, we are still coming to appreciate in sometimes surprising new ways how the phenomenon of culture is transforming this planet. I suggest that despite the apparent pervasiveness of the concept, or at least the word, in both scholarly and everyday discourse, we have yet to appreciate the full potential of the concept of culture as an intellectual tool. Through brief exploration of five different situations in which it is useful, I hope to illustrate the importance of the phenomenon and show the untapped potential of the concept.
On a Class of Infinite Semipositone Nonlinear Systems with Multiple Parameters
Authors: Rasouli S. H. 
Published: July 2017

<p>We analyze the existence of positive solutions of infinite semipositone nonlinear systems with multiple parameters of the form</p><span>{</span>Δu = α<sub>1</sub> (f (v)) - 1/<sub>u</sub><sup>n</sup>) + β<sub>1</sub>(h (u) - 1/<sub>u</sub><sup>n</sup>), x € Ω),<br /> -Δv = α<sub>2</sub> (g (u)) - 1/<sub>v</sub><sup>θ</sup>) + β<sub>2</sub>(k (v) - 1/<sub>u</sub><sup>θ</sup>), x € Ω), <br /> u = v = 0, x € δΩ),<p>where Ω is a bounded smooth domain of R<sup>N</sup>, η, θ ε (0, 1), and α<sub>1</sub>, α<sub>2</sub>, β<sub>1</sub> and β<sub>2</sub> are nonnegative parameters. Here f, g, h, k ε C ([0, ∞ ]), are non-decreasing functions and f(0), g(0), h(0), k(0) &gt; 0. We use the method of sub-super solutions to prove the existence of positive solution for α<sub>1</sub> + β<sub>1</sub> and α<sub>2</sub> + β<sub>2</sub> large.</p>
Un modelo de inversión óptima para fondos soberanos: caso fondo mexicano del petróleo para la estabilización y el desarrollo
Authors: Sierra-Juárez Guillermo , Méndez García Daniela 
Published: July 2017

Antecedentes: Los estudios referentes a la optimización de los recursos provenientes de la producción petrolera son un tema de fundamental importancia para México. La constitución de fondos de distintas características (como los fondos soberanos), los cuales sirvan para administrar y cubrir esta riqueza es una tarea primordial que ha emprendido el gobierno federal. Metodología: El objetivo del presente trabajo es proponer un modelo de optimización estocástica que pueda servir para el soporte y análisis de las políticas de decisión sobre los fondos constituidos provenientes del petróleo. Dicho modelo maximiza la utilidad de un inversionista sujeto a una restricción de riqueza integrada por una dotación petrolera y un activo financiero, con sus coberturas de opciones financieras y bonos utilizando la técnica HJB. Resultados: Después de aplicar la herramienta se hace una análisis sobre el cambio en los valores de las ponderaciones invertidas en cada uno de los activos al variar los parámetros. Conclusión: En general se puede decir que la cartera propuesta es de cobertura más que especulativa y los resultados obtenidos en el análisis de sensibilidad de los ponderadores de los activos son consistentes con la intuición esperado y la política pública.
Guest Column: SPE: Weathering the Downturn
Authors: Byrne Steve 
Published: July 2017

Guest column
When oil prices began to fall rapidly in the last half of 2014, the impact was quickly felt in all of SPE’s programs. Our magazines were affected first by a reduction in advertising as companies reduced their marketing budgets. Training course attendance was next as companies cut back training and travel. Conference and workshop participation declined as travel was constrained, and technical programs for conferences were affected as authors were unable to present their papers. Participation in exhibitions held up for a while as many companies honored commitments that had already been made, but subsequent rebooking of exhibits declined. It quickly became apparent that all of SPE’s main programs were going to be suppressed as long as prices remained low and would likely trail the recovery of prices on the way out of the downturn.
Understanding that SPE could not continue to operate in a business-as-usual fashion, the Board of Directors and senior staff began examining the impact to SPE and options for adjusting operations to the downturn. SPE is very fortunate to have financial reserves to smooth the impacts of the economic fluctuations common to our industry. During the years of high prices, we were able to build a reserve fund and invest it to see us through harder times. As it became clear that the industry was facing a “lower for longer” situation, we recognized that we needed to adjust our operations to fit industry conditions.
When oil prices were high, SPE initiated a number of new member programs. One of our first steps was to examine these newer programs to determine whether they could be paused until conditions improved, or reduced in some manner to improve their economics. This effort quickly spread to longer-standing programs as well. Changes made to PetroBowl are an example of the type of action taken by the Board. The program had grown the number of teams involved, and SPE was covering the travel costs for many teams to attend the finals during ATCE. The costs had increased significantly. The Board modified the way in which regional teams are selected for the finals at ATCE and reduced the costs being borne by SPE for this popular program.
Major Alaskan Discoveries Promote Great Expectations
Authors: Rassenfoss Stephen 
Published: July 2017

The Pikka Field discovered by Armstrong Oil & Gas is just 2 to 3 miles wide, about 30 miles long, could produce 1.2 billion barrels of oil, and is one of three major finds that have shattered assumptions about what is possible in the most explored parts of Alaska’s North Slope.
“The Armstrong discovery, and especially the size of that discovery, was stunning to everyone,” said David Houseknecht, a geologist for the US Geological Survey who has done multiple assessments of the potential in the area. “The thinking was the biggest oil pool we could imagine had 200 to 250 million barrels of recoverable oil. These discoveries coming in with more than a billion barrels or 300 million barrels, at least, really change things by an order of magnitude.”
The find by Armstrong in March may not be the biggest of the three. A discovery by Caelus Energy in Smith Bay called Tulimaniq could produce twice as much oil though the development challenges are also much greater. And Conoco Phillips’ Willow discovery could ultimately produce from 3.3 to 3.9 billion, and add more than 400,000 B/D of production in the next decade.
It is an impressive total, even when discounted for the fact that these are early estimates in a costly area for development in a period of struggling oil prices. In addition, what has been learned about identifying the subtle signs of oil trapped within two large formations—the Nanushuk and the Torok—could open up greater opportunities.
The recent finds could turn the Nanushuk from a minor reservoir into a “virtually unexplored play fairway covering at least 9000 to 15000 km2 that includes both onshore and shallow offshore areas,” said Houseknecht. He made the comment during a presentation at the recent annual meeting of the American Association of Petroleum Geologists in Houston, where even poster sessions on the North Slope drew crowds.
Those finds highlight advances in the tools used to look for oil pockets trapped in the earth, and unconventional techniques needed to maximize production from conventional reservoirs that are tighter than the free-flowing reservoirs found in the aging Prudhoe Bay field to the east.
“The bottom line is, because of 3D seismic and because of the completion practices used for unconventionals, we can now reasonably look at low-permeable Brookian [Nanushuk and Torok] reservoirs as viable,” he said.
One sign of the industry’s confidence was bidding at state and federal lease sales in December, where Conoco Phillips was the most aggressive bidder, picking up about 600,000 net acres, said Alison Wolters, a research analyst for Wood Mackenzie.
Custom-Designed Coiled Tubing Leads to Success in Extended-Reach Operations
Authors: Wilson Adam 
Published: July 2017

This article, written by Special Publications Editor Adam Wilson, contains highlights of paper SPE 184752, “Vaca Muerta Coiled-Tubing-Operations Success and the Development of Future Extended-Reach Operations,” by I.I. Galvan, Global Tubing; M.M. Nebiolo, R.D. Del Negro, and G.A. Landinez Gomez, YPF; C. Cerne, SPE, ThruTubing Solutions; and A. Sanchez, SPE, and G. Mallanao, Global Tubing, prepared for the 2017 SPE/ICoTA Coiled Tubing and Well Intervention Conference and Exhibition, Houston, 21–22 March. The paper has not been peer reviewed.
Advanced horizontal drilling, multistage hydraulic fracturing, and other technologies have helped make the Vaca Muerta shale oil and gas resource economically viable. An option to exploit this resource better is to increase the length of the horizontal section of each well to add hydraulic-fracture stages. Anticipated high angles in deviated well sections, along with the extended horizontal length of the planned wells, formed an expectation that conventional coiled-tubing (CT) designs would not be able to service the new well designs. Using refined, custom-engineered CT-string designs appears to be an economic and efficient solution.
Project Overview
Increased diameter, strength, and reliability have made CT the preferred cost-effective well-intervention solution in the Vaca Muerta unconventional shale development; however, the maximum lateral reach the CT can achieve during operations is a limiting factor for well optimization.
Initially, 2-in. CT strings with a simple wall taper shape were an effective and reliable option to complete wells in the first development stage. However, the need for optimized design and even-larger-diameter CT with enhanced-wall-thickness configurations became apparent when an increase of the well lateral lengths was attempted.
CT-String Design Considerations
The CT-string designs followed a cooperative process between the operator, the CT service companies, tool providers, and the CT-manufacturing engineers. Tubing forces, buckling occurrence, and lockup depths were analyzed in detail to determine the optimal CT size and string design makeup to ensure the likelihood of reaching target depth (TD) in the planned extended-reach wells. Additionally, hydraulic analysis was performed to compare frictional pressure losses (CT, bottomhole-assembly, and annular) using the optimal flow rates for annular velocities adequate to support sufficient well cleaning. The results from the analysis were used to estimate fatigue accumulation in the CT strings, considering anticipated circulating pressures and surface-equipment (reel and gooseneck arch) dimensions.
The primary objective for the new CT-string design is to optimize lateral reach and available weight on bit for post-fracture mill-out operations.
What Vacuum-Insulated Tubings and Casings Bring to Thermal Wells
Authors: Carpenter Chris 
Published: July 2017

This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 182515, “What Vacuum-Insulated Tubings (or Vacuum-Insulated Casings) Bring to Thermal Wells,” by J. Damour and D. Johannson, Majus, prepared for the 2016 SPE Thermal Well Integrity and Design Symposium, Banff, Canada, 29 November–1 December. The paper has not been peer reviewed.
This paper describes both design and economic considerations that lead to the selection of vacuum-insulated tubing (VIT) or vacuum-insulated casing (VIC) for the completion of thermal wells. The results shared in this paper are some of the parameters considered during thermal-well design: temperature on the casing and the tubing, and heat loss. Knowing these parameters, well integrity can be studied and the overall efficiency of the process estimated.
Introduction
The most common thermal enhanced-recovery methods are cyclic steam stimulation, steamflooding, and steam-assisted gravity drainage, which is widely used in Canada. The role of these thermal-recovery methods is to convey heat into the reservoir, mainly by convection. The temperature of the oil increases and its viscosity decreases significantly in the reservoir. These methods can substantially increase the oil production of a field, increase the recovery factor, or unlock some heavy-oil assets.
Typical steam-injection temperature is between 250 and 310°C; in a few cases, it could be greater than 310°C. This high-temperature application requires adapting the design of the injector wells to avoid any mechanical failure of the well or to mitigate heat loss through the well. VIT or VIC are solutions to some of these issues.
VIT technologies have evolved significantly since their first application. Different materials are used as insulation material, and several designs are proposed by the industry to achieve the best thermal-performance-vs.-cost equation.
A model was developed to assess the temperature of the different components of a well—tubing, casing, cementation, and ground—and to provide the heat loss occurring during the steam injection. The results show that the wide range of VIT thermal performance provides a range of casing temperatures. Thus, the casing thermal expansion or thermal loads resulting from this temperature increase range significantly.
The response of nitrous oxide emissions to different operating conditions in activated sludge wastewater treatment plants in Southeastern Brazil
Authors: Ribeiro Renato P. , Bueno Rodrigo F. , Piveli Roque P. , Kligerman Débora C. , de Mello William Z. , Oliveira Jaime L. M. 
Published: July 2017

Abstract
The continuous measurements of N2O emissions from the aeration tanks of three activated sludge wastewater treatment plants (WWTPs) operated with biological nitrogen removal (BNR) and non-BNR were performed during the different operating conditions of several parameters, such as aeration, dissolved oxygen (DO) profiling and organic shock loading (with landfill leachate). The nitrification process is the main driving force behind N2O emission peaks. There are indications that the variation of the air flow rate influenced N2O emissions; high N2O emissions denote over-aeration conditions or incomplete nitrification, with accumulation of NO2− concentrations. Thus, continuous measurements of N2O emissions can provide information on aeration adequacy and the efficiency of complete nitrification, with major focus on DO control, in order to reduce N2O emissions. An additional concern is the observed propensity of WWTPs in developing countries to receive landfill leachates in their wastewater systems. This practice could have adverse effects on climate change, since wastewater treatment during periods of organic shock loading emitted significantly higher amounts of N2O than without organic shock loading. In short, non-BNR WWTPs are subject to high N2O emissions, in contrast to BNR WWTP with controlled nitrification and denitrification processes.
Drilling Mechanism Investigation on SiC Ceramic Using Diamond Bits
Authors: Gao Chao , Wu Guorong , Wang Sheng 
Published: July 2017

Background:
SiC ceramic have been widely used in the fields of armor protection, but SiC ceramic is one of the difficult-to-machine material for its high hardness and low fracture toughness.

Objective:
This paper presents an investigation of drilling mechanism on SiC ceramic using diamond bits.

Method:
Based on the theory of indentation fracture mechanics model, cutting average load model and cutting average depth model for single particle were established, theory analysis of drilling mechanism was carried out; through scanning electron microscope (SEM) observation, experimental removal mechanism was discussed.

Results and Conclusions:
The results show that, brittle fracture is the dominant way for SiC ceramic’s removal mechanism, plastic deformation always exists during the drilling process. Brittle fracture includes cleavage fracture, transgranular fracture, intergranular fracture, material peeling off and grain boundary breakage; resintering and recrystallization happen under the joint action of grinding forces and grinding heat in the contact area, where plastic flow characteristics also appear; powdering removal is accompanied by the drilling process; cleavage fracture and transgranular fracture occur on intergranular pores and grain boundary; residual cracks are found in the drilling surface resulted by drilling stress and high temperature.
Sensitivity of WRF Cloud Microphysics to Simulations of a Convective Storm Over the Nepal Himalayas
Authors: Shrestha Rudra K. , Connolly Paul J. , Gallagher Martin W. 
Published: July 2017

Background:This paper investigates sensitivity of bulk microphysical parameterization (BMP) schemes within the Weather Research and Forecasting (WRF) model to simulate a convective storm that generally evolves during pre-monsoon season (March – May) across the foothills of the Himalayas.Method:Four mixed-phase BMP schemes (Morrison, Lin, WDM6, and WSM6), which are parameterized with an increasing complexity from single to double moments of particle distribution to represent cloud processes, are used with an explicit convection permitting grid resolution (3 km x 3 km). Experiments are set up to simulate a convective storm that occurred in the late afternoon of 18thMay 2011 and compared with i) Satellite-based tropical rainfall measuring mission (TRMM) 3B42 v7 data, and ii) Ground-based observations at Nagarkot (27.7°N, 85.5°E), Nepal.Result:Our results show that the simulated storm characteristics are not overly sensitive to the chosen BMP schemes. In general, all the BMP schemes produce similar rainfall characteristics and compares reasonably well with the observations across Siwalik Hills and Middle Mountains, which act as a topographic barrier to low level circulations and receive more rain. The schemes, however, show negative bias across central Nepal including the Kathmandu Valley, albeit the magnitude and spatial distribution of bias are different between the schemes. In contrast, upper level total water condensate and cloud fraction show a strong sensitivity to the BMP schemes.Conclusion:Overall, the Morrison scheme, in addition to warm clouds which also predict double moment distribution of all hydrometeors in the cold-cloud processes, a dominant cloud forming process in the Himalayas, accurately represents the mechanism and outperforms the simplified schemes based on root mean square error (RMSE) analysis.