scholarly journals Optimalisasi Pembagian Batang (Bucking Policy) Kayu Bulat Jati dalam Rangka Meningkatkan Pendapatan KPH Madiun

2017 ◽  
Vol 11 (1) ◽  
pp. 43
Author(s):  
Wahyu Andayani ◽  
Ris Hadi Purwanto ◽  
Slamet Riyanto
Keyword(s):  
Policy Implementation ◽  
Raw Materials ◽  
Optimization Theory ◽  
Optimization Process ◽  
Economic Values ◽  
The Core ◽  
Significant Potential ◽  
Policy Optimization ◽  
Policy Guidance ◽  
Diameter Classes

Pendapatan KPH Madiun akan naik jika metode pembagian batang optimal diimplementasikan, sesuai dengan teori optimalisasi. Hal tersebut karena lebih dari 50% kontribusi pendapatan KPH Madiun Perum Perhutani Unit II Jawa Timur sampai saat ini berasal dari penjualan kayu jati. Produk yang dijual meliputi berbagai sortimen yang ditetapkan dengan kebijakan pembagian batang sesuai “Petunjuk Pelaksanaan Pembagian Batang Kayu Bundar Jati Tahun 2006”. Tujuan penelitian ini adalah menerapkan metode pembagian batang optimal dengan menggunakan teori program linier. Hasil penelitian menemukan bahwa, terdapat 96 alternatif cara pembagian batang dari 6 kelas diameter, dan 16 sortimen terdiri dari : vinir, hara, kayu bahan parket (KBP) untuk kebutuhan industri lokal. Kesimpulan penelitian adalah : pendapatan KPH Madiun meningkat sebesar Rp. 4.599.460/m3, atau sebesar Rp. 8.921.623/pohon, sedangkan realisasi pendapatan usaha yang diperoleh saat ini adalah sebesar Rp. 3.701.503/m3 atau sebesar Rp. 7.179.847/pohon. Dengan demikian jika metode optimalisasi diterapkan nilai ekonomi per pohon akan naik sebesar 24,26% atau setara dengan volume sebesar 1,94 m3.Bucking Policy Optimization of Teak Log to Increase the Revenue of KPH Madiun. AbstractThe revenue of KPH Madiun could have been effectively increased through improvement in its bucking policy implementation. Such implementation had been formulated in this research using optimization theory to generate the maximum total economic values of log assortments cut from felled trees. As teakwood production had been the core business, contributing more than 50 % of the revenue, KPH Madiun Perum Perhutani Unit II East Java had been choosen as the object and location of this research. The research found and analized 96 alternatives of bucking policy implementations, derived from 6 possible diameter classes, and 16 possible assortment quality classes. The log assortment was identified by its diameter, length, and quality, as raw materials of veneer, parquet, and local industry. Through optimization process, the optimum bucking policy could potentially increase revenue of KPH Madiun to the maximum of IDR 4,599,460 per m3, or IDR 8,921,623 per tree of 1.94 m3 average. Comparing to existing revenue of IDR 3,701,503 per m3, or IDR 7,179,847 per tree of the same average, which has been based on the formal bucking policy guidance of um Perhutani Unit II (2006), it could be a significant potential increase of 24.26 % or equal to 1.94 m3.

Modeling of the Transition Layer in Ceramic Matrix Composites from Coal Wastes and Clay

2020 ◽  
Vol 299 ◽  
pp. 37-42
Author(s):  
O.A. Fomina ◽  
Andrey Yu. Stolboushkin
Keyword(s):  
Transition Layer ◽  
Raw Materials ◽  
Ceramic Matrix Composite ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Coal Waste ◽  
Matrix Composites ◽  
Carbonaceous Particles ◽  
The Core ◽  
Coal Wastes

A model of the transition layer between the shell and the core of a ceramic matrix composite from coal waste and clay has been developed. The chemical, granulometric and mineral compositions of the beneficiation of carbonaceous mudstones and clay were studied. The technological and ceramic properties of raw materials for the samples manufacturing were determined. The method of manufacturing multilayer ceramic samples from coal waste, clay and their mixture is given. The number of transition layers in the contact zone between the clay shell and the core from coal wastes is determined. The deformation and swelling phenomena of model samples from coal wastes, clay, and their mixtures were revealed at the firing temperature of more than 1000 °C. The formation of a reducing ambient in the center of the sample with insufficient air flow is shown. The influence of the carbonaceous particles amount and the ferrous form iron oxide in the coal wastes on the processes of expansion of multilayer samples during firing has been established.

scholarly journals Cooperation and tensions in multiethnic corporate societies using Teotihuacan, Central Mexico, as a case study

2015 ◽  
Vol 112 (30) ◽  
pp. 9210-9215 ◽  
Author(s):  
Linda R. Manzanilla
Keyword(s):  
Gulf Coast ◽  
Raw Materials ◽  
Volcanic Eruptions ◽  
Cotton Cloth ◽  
Central Mexico ◽  
Economic Power ◽  
Ruling Elite ◽  
Strong Ties ◽  
The Core

In this paper, I address the case of a corporate society in Central Mexico. After volcanic eruptions triggered population displacements in the southern Basin of Mexico during the first and fourth centuries A.D., Teotihuacan became a multiethnic settlement. Groups from different backgrounds settled primarily on the periphery of the metropolis; nevertheless, around the core, intermediate elites actively fostered the movement of sumptuary goods and the arrival of workers from diverse homelands for a range of specialized tasks. Some of these skilled craftsmen acquired status and perhaps economic power as a result of the dynamic competition among neighborhoods to display the most lavish sumptuary goods, as well as to manufacture specific symbols of identity that distinguished one neighborhood from another, such as elaborate garments and headdresses. Cotton attire worn by the Teotihuacan elite may have been one of the goods that granted economic importance to neighborhood centers such as Teopancazco, a compound that displayed strong ties to the Gulf Coast where cotton cloth was made. The ruling elite controlled raw materials that came from afar whereas the intermediate elite may have been more active in providing other sumptuary goods: pigments, cosmetics, slate, greenstone, travertine, and foreign pottery. The contrast between the corporate organization at the base and top of Teotihuacan society and the exclusionary organization of the neighborhoods headed by the highly competitive intermediate elite introduced tensions that set the stage for Teotihuacan’s collapse.

scholarly journals Disease control as an optimization problem

PLoS ONE ◽  
2021 ◽  
Vol 16 (9) ◽  
pp. e0257958
Author(s):  
Miguel Navascués ◽  
Costantino Budroni ◽  
Yelena Guryanova
Keyword(s):  
Disease Control ◽  
Stochastic Models ◽  
Optimization Problem ◽  
Initial Conditions ◽  
Optimization Theory ◽  
Model Parameters ◽  
Grid Search ◽  
Brute Force ◽  
Time Required ◽  
Policy Optimization

In the context of epidemiology, policies for disease control are often devised through a mixture of intuition and brute-force, whereby the set of logically conceivable policies is narrowed down to a small family described by a few parameters, following which linearization or grid search is used to identify the optimal policy within the set. This scheme runs the risk of leaving out more complex (and perhaps counter-intuitive) policies for disease control that could tackle the disease more efficiently. In this article, we use techniques from convex optimization theory and machine learning to conduct optimizations over disease policies described by hundreds of parameters. In contrast to past approaches for policy optimization based on control theory, our framework can deal with arbitrary uncertainties on the initial conditions and model parameters controlling the spread of the disease, and stochastic models. In addition, our methods allow for optimization over policies which remain constant over weekly periods, specified by either continuous or discrete (e.g.: lockdown on/off) government measures. We illustrate our approach by minimizing the total time required to eradicate COVID-19 within the Susceptible-Exposed-Infected-Recovered (SEIR) model proposed by Kissler et al. (March, 2020).

A New Approach to Mathematical Simulation of Sheduling at an Industrial Plant

2021 ◽  
pp. 103-114
Author(s):  
N.P. Savenkova ◽  
V.S. Laponin ◽  
A.Yu. Mokin ◽  
L.A. Artemieva ◽  
A.A. Dryazhenkov
Keyword(s):  
Production Process ◽  
Raw Materials ◽  
Mathematical Formulation ◽  
Practical Importance ◽  
Optimization Theory ◽  
Inequality Constraints ◽  
Industrial Plant ◽  
Plant Management ◽  
Physical Constraints ◽  
Close Relationship

The purpose of this work was to build a model of industrial plant management and develop a schedule plan based on it. The paper considers a controlled model of product flows at an industrial enterprise. The model describes the interaction between various objects at the enterprise: production plants, manifolds, overpasses, piers, transport. In addition, the model specifies the composition and proportions of the components of raw materials and additives for each type of manufactured product, as well as physical constraints on the objects involvedin the production process. This brings us to the model of both the quality functional and equality and inequality constraints in the mathematical formulation. After building the model, the original control problem was reduced to two problems: direct and inverse. The numerical solution of both is provided in a close relationship between them. The study uses the findings from the theory of mathematical modeling, linear algebra and optimization theory, and leads to the development of the technique of building models of scheduling at an enterprise and numerical methods for solving the corresponding management problems. The research results are of great practical importance and can be used for effective management of the production process in many industries

Comparative Study on Microencapsulated of Natural and Waste Sunflower Oil as Self-Healing Agent

2020 ◽  
Vol 1010 ◽  
pp. 439-444
Author(s):  
Zulkhibri Baharom ◽  
Maizlinda Izwana Idris ◽  
Tee Chuan Lee ◽  
Hasan Zuhudi Abdullah
Keyword(s):  
Sunflower Oil ◽  
Raw Materials ◽  
Metal Coating ◽  
Natural Material ◽  
Self Healing ◽  
Micro Structure ◽  
The Core ◽  
Core Content ◽  
Healing Agent ◽  
Alternative Resource

Microencapsulation of natural vegetable oil as a self-healing agent on metal coating became demanded lately. This paper underlines the microcapsule containing natural and wastes sunflower oil as a self-healing agent that was fabricated for the backbone of corrosion coatings. The results in this paper indicated the distinguished potential of waste sunflower oil as compared to natural sunflower oil. The diameter of microcapsules synthesized from natural sunflower oil and waste sunflower oil both in range of 3-4 µm. The shell of microcapsules microencapsulated from natural sunflower oil showed rough micro-structure while the shell of microcapsules microencapsulated from waste sunflower oil showed smooth micro-structure. The main parameter studied in this research was the varient of stirring speed during the process of microencapsulation. The involvement of stirring speed starts from 200 to 400 rpm. The microcapsules undergo varient of stirring speed analyzed on the yield and core content of microcapsules. The microcapsules from natural produced 29-50% while waste resources bring 26-48% of yield productions. The core content of microencapsulated natural sunflower oil generates 55-64% core content as comparing with waste sources which produce 56-67% of core content. It can be concluded that it was proved that sunflower oil could be considered as an alternative resource for self-healing agent in metal coating either encapsulated from natural or waste raw materials. The incorporation of green and natural material as a self-healing agent significantly influences the sustaining the environment to the safest stage.

Mathematical Modeling of the Unit Load Formation

2013 ◽  
Vol 309 ◽  
pp. 358-365 ◽  
Author(s):  
Béla Illés ◽  
Gabriella Bognár
Keyword(s):  
Mathematical Modeling ◽  
Supply Chain ◽  
Significant Role ◽  
Mathematical Description ◽  
Raw Materials ◽  
Transport Processes ◽  
Optimization Process ◽  
Objective Functions ◽  
Unit Load ◽  
Major Factors

A fast and efficient way of handling and storing components, raw materials, semi-finished and finished products play a significant role in the development of transport, storage and distribution design within the supply chain. One of the most important issues in storage and transport processes is the formation of unit loads. Our main goal is to give a mathematical description of a model involving the major factors of the unit load formation. The optimization process is exhibited applying the determined objective functions and constraints related to the basic tasks.

scholarly journals Gems and Jewels: Passing Down Specialized Knowledge and Skills in Pakistan’s MineralRich Province of Balochistan

2019 ◽  
Vol 10 (3) ◽  
pp. 64-69
Author(s):  
Mumtaz A. Baloch ◽  
Sakina Riaz ◽  
Saman Saman ◽  
Ghulam Yaseen ◽  
Bibi Kalsoom
Keyword(s):  
United Arab Emirates ◽  
Raw Materials ◽  
Study Participant ◽  
College Level ◽  
Group Discussions ◽  
Specialized Knowledge ◽  
Knowledge And Skills ◽  
Business Skills ◽  
The Core ◽  
Set Up

Gemology and jewelry training are at the core of what the Gems and Jewelry Training and ManufacturingCentre in Baluchistan’s mineral rich province in the southwest of Pakistan does and stands for. Widespread poverty,illiteracy and resistance against foreign influence set a stark contrast to what is happening within the circuit of artisanswhose surface this descriptive social analysis is an attempt to enter more deeply into this world hidden from the outsidegaze. For this study, mixed research methods were used like participant observations, focused group discussions andhousehold questionnaires for a tool for data collection. Contradicting, what one may expect the data revealed that thevast majority (95 percent) of this study participant were young and educated. In addition, 55 percent of their incomecomes from applying the acquired specialized knowledge and skills. On average, they saved Pakistani Rupees266,311/- a year, which is a commendable amount considering the local circumstances. Nearly all of the respondentshad received practice-oriented education from the Gems and Jewelry Training and Manufacturing Centre. Faceting is,besides knowing the qualities of precious and semi-precious stones, a core focus of the training program. Theprogram’s alumni had originally learnt of the Centre’s existence through sign boards, the Internet, and print media.Their savings, interestingly, are spent on education, with their children going to private schools. About two thirds of theinterviewed men and women confirmed that on completion of their training, they purchased raw materials/gems. Theyalso bought mobile phones and motorbikes, which they considered to be part of the ‘tool kit’ required to be successfulin their business. Importantly, about half of the respondents regretted not having been able to set up their own business,partly because they lacked the requisite business skills. Hence, based on this field-based survey, we a comprehensivestudy program is required at the college-level that combines gemology, gem cutting and faceting and fine and fashionjewelry, with business administration and marketing. Ideally, this would be carried out in collaboration withprofessional schools and colleges from China, The United Arab Emirates, and Thailand in order to give greaterimportance to this sector with its high development potential.

Non-Arctic Countries of Asia and Russia

2019 ◽  
pp. 185-206
Author(s):  
Mikail Khudzhatov
Keyword(s):  
Raw Materials ◽  
Mineral Resources ◽  
The Arctic ◽  
Investment Activity ◽  
Climate Conditions ◽  
Significant Potential ◽  
The North ◽  
Advanced Technologies ◽  
Critical Problems ◽  
The Republic

The Arctic is characterized by a significant potential in terms of mineral resources, raw materials, hydrocarbons, and energy. In the North, mining and extractive industries are booming, but the expansion of exploration in the severe climate conditions requires the use of advanced technologies, many of which have not been developed and adopted in Russia. For this reason, there is a need to promote investment activity in the Arctic. This chapter discusses the most effective customs instruments for the attraction of foreign investments, identifies critical problems in the sphere of development of investment collaboration between Russia and non-Arctic countries of Asia (China, Japan, and the Republic of Korea), and offers practical solutions in the field of investment collaboration in the High North.

The New Stage of Globalization

2015 ◽  
Vol 67 (3) ◽  
pp. 144
Author(s):  
Harry Magdoff
Keyword(s):  
Financial Institutions ◽  
Direct Investment ◽  
Index Volume ◽  
Foreign Capital ◽  
Raw Materials ◽  
Money Markets ◽  
Change Of Direction ◽  
The Core ◽  
Credit Creation ◽  
Key Money

By the end of 1990, foreign direct investment&mdash;that is, investment in manufacturing, real estate, raw materials, extraction, financial institutions, etc., made by capitalists of all lands outside their national borders&mdash;reached over $1.5 trillion&hellip;. [W]hat is significant about this number is not only its size but the unprecedented speed with which it has grown in the last two decades: the amount directly invested in foreign lands nearly tripled in the 1980s alone&hellip;. This upsurge and diversification of globalization has been introducing new economic and political features in the countries of both the periphery and the core. In the periphery, foreign capital has penetrated more widely and deeply than ever before. In the core, this change of direction has helped produce in the world's key money markets an extraordinary spiraling of credit creation, international flows of money capital, and speculation.<p class="mrlink"><p class="mrpurchaselink"><a href="http://monthlyreview.org/index/volume-67-number-3" title="Vol. 67, No. 3: July 2015" target="_self">Click here to purchase a PDF version of this article at the <em>Monthly Review</em> website.</a></p>

Research on the Quality Safety Risk Control of Raw Materials and Accessories of Liquor

2014 ◽  
Vol 1010-1012 ◽  
pp. 1810-1813
Author(s):  
Hai Hong Xin ◽  
Wei Wang ◽  
Ting Xin Wang ◽  
Yi Man Fan
Keyword(s):  
Production Process ◽  
Agricultural Production ◽  
Raw Materials ◽  
Risk Control ◽  
Supplier Evaluation ◽  
Traceability System ◽  
The Core ◽  
Physical Hazards ◽  
Contingency Plans ◽  
Information Construction

In order to reduce the quality safty risk of liquor from the source, the biological,chemical and physical hazards of the raw materials and accessories of the cereal liquor was analyzed, the internal traceability system with raw materials and accessories inspection and supplier evaluation as the core was established by applying HACCP. In addition, Hazard of each agricultural production process was analyzed, the traceability system of raw materials and accessories supplier was established by using traceability theory.It realized the seamless full traceability in the inner of the enterprise and outside supplier based on current sourcing practices.According to the study,some suggestions were given about how to improve the traceability control of liquor raw materials and accessories in production mode, cooperation methods, incentives, contingency plans and information construction.

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