ALIH TEKNOLOGI PENGOLAHAN PANGAN LOKAL DI KENAGARIAN ANDALEH, LIMAPULUH KOTA

Jagung banyak dibudidayakan di Kenagarian Andaleh di Kecamatan Luak, Kabupaten Limapuluh Kota. Jenis jagung yang dibudidayakan adalah jagung gigi kuda yang sering dijadikan sebagai pakan ternak terutama pakan unggas. Jagung gigi kuda memiliki biji berbentuk gigi, mengandung karbohidrat (pati) yang tinggi, dan bertekstur keras. Ciri khas jagung ini adalah memiliki biji yang melekuk di bagian tengah atau bagian atas biji. Kegiatan ini bertujuan untuk meningkatkan pengetahuan masayarakat Nagari Andaleh Kecamatan Luak, tentang pemanfaatan bahan pangan lokal, khususnya komoditi jagung ini melalui alih teknologi pengolahan menjadi nugget jagung. Kegiatan diawali dengan memberikan penyuluhan tentang praktik sanitasi, meliputi sanitasi pekerja, sanitasi peralatan, dan sanitasi pengolahan, serta cara pengolahan pangan yang baik. Nugget jagung dibuat dari campuran daging ayam dan jagung dengan perbandingan 1:0.2. Melalui kegiatan ini, masyarakat mampu menerapkan higieni dan sanitasi dalam pengolahan pangan, serta memiliki keahlian dalam pengolahan jagung menjadi produk pangan baru, yaitu nugget jagung, sehingga meningkatkan pemanfaatan bahan pangan lokal dan meningkatkan perekonomian masyarakat. Dengan alih teknologi pemanfaatan bahan pangan lokal jagung diharapkan tumbuh motivasi untuk mengembangkan usaha skala rumah tangga yang berpengaruh pada peningkatan perekonomian masyarakat di Kenagarian Andaleh. Kata kunci: Jagung Gigi Kuda, Nagari Andaleh, Nugget Jagung, Alih Teknologi, Pangan Lokal ABSTRACT Corn is widely cultivated in Andaleh Village, Luak Sub-district, Lima Puluh Kota Regency. The type of corn that cultivated in this village is dent corn (Zea mays var. indentata), which often used as animal feed, especially poultry feed. Dent corn has a tooth-shaped seed, contains high carbohydrates (starch), and has a hard texture. The characteristic of this corn form is that the seeds have an indentation in the middle or top of the seed. The purpose of this programs was to increased the knowledge Andaleh Village community, Luak District, about the utilization of local food, especially dent corn through the transition technology of corn processing to be corn nuggets. The activity began with provided counseling on sanitation practices, including personal sanitation, equipment sanitation, and processing sanitation, as well as good manufacturing practice. Corn nuggets were made from a mixture of chicken and corn in a ratio of 1: 0.2. Through this programs, the community will be able to apply hygiene and sanitation in food processing, and have expertise in processing corn into new products like nuggets, thereby can increase the utilization of local foodstuffs and improve the community's economy. Transition technology to use local dent corn was expected to grow the motivation of community to develop household-scale businesses that have an effect to increase the economy of the Andaleh Village community. Keywords: Dent Corn, Andaleh Village, Corn Nugget, Transition of Technology, Local Foods

On the Plastic Bending Responses of Dented Lined Pipe

Mechanically lined pipe, which was proven to be cost-effective in transporting corrosive hydrocarbons, has been used in many offshore applications. However, one weakness of this product is that the liner is extremely sensitive to geometric imperfections and can wrinkle and collapse under severe loading. As typical damage of the pipeline, the local dent of the lined pipe involves the deformation of both the carrier pipe and the liner, which poses a severe threat to the integrity of the composite structure. In this paper, we developed a numerical framework to study the responses of the lined pipe during indentation and, more importantly, the influence of local dents on the bending capacity of lined pipes. A slight separation between the liner and the carrier pipe was observed during the indentation, depending on the indenter’s geometric feature. Under bending, the liner typically collapsed earlier than the carrier pipe, causing a considerable reduction of the critical curvature and ultimate load-carrying capacity. The evolution of the deformation of the composite structure during the bending process is presented in this paper. Parametric investigations of some vital variables of the problem were also performed to study their influence on the behavior under indentation and the bending capacity of the composite structure.

Numerical Studies on Dynamic Behavior of Tubular Pipes Under Repeated Impacts

The tubular pipes of Jacket platform may be frequently subjected to repeated impact loadings from vessels and dropped objects during the operation life, which may lead to serious damages to the platform. In this paper, the numerical studies on dynamic behavior of tubular pipe subjected to repeated impact loadings was performed. The deformation profile and permanent deflection in numerical simulation were compared with those in experiment, and good agreement was achieved. Besides, the mechanism of deformation accumulation and energy absorption were analyzed. Results showed that, the tubular pipe mainly produced transverse expanding and local dent, the global bending was very small. The permanent deflection at the middle of the pipe increased as the impact numbers increased, while the increment decreased. In addition, with the increase of impact number, the elastic deformation energy stored by the tubular pipe increased, and the plastic deformation energy decreased.

A New Formulation for Predicting the Collision Damage of Steel Stiffened Cylinders Subjected to Dynamic Lateral Mass Impact

The objective of this study is to develop a new formulation for predicting the permanent local denting damage of steel ring and/or stringer-stiffened cylinders under dynamic lateral mass impact. The considered scenarios could represent the collisions of offshore cylindrical structures with bow or stern of service vessels or floating objects. Before deriving the formulations, the numerical methods were developed using ABAQUS/Explicit to determine the deformation of these stiffened cylinder structures subjected to dynamic lateral mass impact. Next, rigorous parametric studies were performed on the actual design full-scaled stiffened cylinder examples using the developed numerical method. Based on the rigorous numerical results, new simple design formulations to predict the maximum permanent local dent depth of a stiffened cylinder are derived through a regression study as the function of a non-dimensional energy parameter. The accuracy and reliability of the derived formulations are confirmed by comparison with the available test results, nonlinear FEA and existing analytical, and empirical equations in the literature. A good agreement with existing test data for ship-offshore structure collisions was achieved.

Transverse Deformation of Pressurised Pipes With Different Axial Loads

Pipelines residing on the seabed are exposed to various hazards, one of them being denting, hooking and release of the pipeline by e.g. anchors or trawl gear. As a pipeline is displaced transversely in a hooking event, an axial tensile load resisting the displacement builds up in the pipeline. This study examines the effect of applying three different axial loads (zero, constant, and linearly increasing) to a pipe while simultaneously deforming it transversely. A fairly sharp indenter conforming to the prevailing design codes was used to deform the pipes. These three tests were repeated with an internal pressure of about 100 bar for comparison. Adding an axial load appeared to increase the pipe’s stiffness in terms of the force-displacement curve arising from deforming the pipe transversely. The internal pressure also increased the stiffness, and produced a more local dent in the pipe compared with the unpressurised pipes. All tests were recreated numerically in finite element simulations. Generally, the results of the simulations were in good agreement with the experiments.

Ultimate Compressive Strength Assessment of Damaged Plates

This paper presents the assessment of the ultimate compressive strength of damaged steel plates with a local dent. The explicit nonlinear finite element code from ABAQUS program was employed to simulate dynamically the dent damage. Therefore, the residual stresses due to the damage were considered in subsequent numerical compression analyses. A parametric study of plates considering residual stresses, geometric imperfections and dents was accomplished. Results showed that local dent is the dominant parameter for the ultimate strength of damaged plates. For a particular dent depth, the effect of welding induced geometric imperfections and residual stresses can be disregarded from the analysis. Afterwards, analytical expressions were developed to estimate the ultimate strength of damaged plates.

Numerical Study about Combined Effect of Distributed Initial Imperfections and Dent on Ultimate Strength of Square Plates under Uni-Axial Compression

Aim of this present work is to study the combined effect of distributed geometric global imperfection and a local dent on buckling strength of thin square plates subjected to uni-axial compression. Steady state non linear FE analysis including both material and geometrical non linearities is used to determine the ultimate strength of the dented plates. From the numerical result it is found that in case of low thickness plates global geometric imperfections effect is more dominant and in case of thick plate dent effect is found to be more dominant.

Study of the Flow Field and Performances of a Centrifugal Pump During Unstable Operating Conditions by CFD

Centrifugal pumps curve instability, characterized by a local dent and uprising head curve, often causes severe problems such as vibrations and noises. At low flow rates, stability of performance curve is necessary for reliable operation of the pump. Most of the studies regarding centrifugal pumps curves instability focus on flow rate around 60 % of the best efficiency flow rate. The purpose of present investigation is to analyse the causes of the occurrence of performance curve instability by means of Computational Fluid Dynamics (CFD) and to understand the mechanism of such instability at flow rates around 30 % of best efficiency flow rate. In order to understand the causes of the performance curve instability, two impellers with different outlet shape are analysed. During experimental tests, performance curve instability appeared around 30 % of the best efficiency flow rate on the first impeller while the second impeller remains stable. CFD analysis also shows unstable performance curve for the first impeller, and stable for the second one. Hence, a detailed analysis of the flow field of the two impellers and a quantitative comparison are performed in order to characterize the instability phenomenon.