Investigation of Hybrid Ionic Liquid Surfactants for Chemical Enhanced Oil Recovery

Enhanced oil recovery (EOR) is being vastly applied and studied in the oil industry and various technologies have emerged over the last decades in order to optimize oil recovery after primary and secondary recovery methods have been applied. Surfactant flooding is a chemical EOR method of injecting one or more liquid chemicals and surfactants into the reservoir for tertiary recovery in which the phase behavior of the reservoir can be manipulated by the injection of surfactants and co-surfactants, creating advantageous conditions in order to mobilize trapped oil. An excellent surfactant system can create micro-emulsions at the interface between water and crude oil, thus reducing the interfacial tension (IFT) which consequently will mobilize the residual oil and result in improved oil recovery. Ionic liquids (ILs) are salts that are in liquid state below 100°C, composed wholly of anions and cations. Over the past decade, ILs has become one of the fastest growing „green‟ media for chemists and engineers due to their superbly versatile physicochemical properties. Studies have shown that long alkyl chain ionic liquids have the potential to decrease the interfacial tension (IFT) of n-alkanes. The application of Hybrid ILs as a chemical EOR agent has a great potential in lowering the IFT against crude oil whilst being able to withstand harsh conditions in reservoirs such as high temperature and highly saline environment, thus giving good recovery factor of the stock tank oil originally in place (STOOIP)

Machine Learning based Classification of Diseased Mango Leaves

The preponderance of population depends on agriculture to produce crops which would be their primary subsistence for their livelihood. So, agriculture is considered the backbone of any nation. Mango (Mangifera indica Linn), belonging to a family Anacardiaceous, is a conspicuous fruit that captivates all ages because of its meticulous taste, delicious flavor, ampleness variety, and highly lustiness. Mangoes are generally rich in minerals, vitamins, fibers, and negotiable fat. Mango plants are exposed to many micro-organisms. If these are not detected and treated in the initial developing stages, it would affect peculiar parts of the mango plant and result in loss of overall productivity. Several factors like biotic and abiotic always ensue in the decrease in the overall productivity of mango plants. Self-regulated Detection of mango plant disease is imperative, and it must be detected at the preliminary stages of the growing period of the mango plant. This paper discusses the existing methodology to classify diseases in mango plant leaves by implementing ensemble technique (Stack) which includes algorithms like Decision Tree (DT), Support vector machine (SVM), Neural Network (NN), and Logistic Regression (LR). The developmental results validate that the disease classification methodology can successfully classify a higher percentage in predicting whether mango plant leaf is healthy or diseased.&nbsp

Cecidogenous Crotonothrips (Thysanoptera)- Memecylon interactions: host relations, nutritive tissue, tissue dynamics and cecidogenetic patterns

The host relations of Crotonothrips with Memecylon on the criterion of gall formation appear interesting. In the light of the morphogenetic courses that the susceptible host organ, the leaf, show, an attempt has been made to assess their functional efficiency in terms of structural adaptations envisaging the organisation of a nutritive zone, and tissue dynamics taking Memecylon edule, Memecylon lushingtonii, and Memecylon umbellatum as models

On the developmental morphology of the rosette galls of Acacia leucophloea Willd., (Mimosaceae) induced by Thilakothrips hablu Ramk. (Thysanoptera: Insecta)

Thilakothrips babuli induces rosette (artichoke) galls on the axillary buds of Acacia leucophloea. As a result of feeding by the building populations of thrips, axillary shoot meristems are destroyed, and primordial palisade tissues of the leaflets and cortical tissues of the shoot axis are transformed into nutritive cells of specialised morphology. Very similar to the galls induced by mites, midges, chalcids, and chloropids, Thilakothrips-induced Acacia galls also have a characteristic morphology, involving the inhibition of elongation of the shoot axis and crowding of maldeveloped leaflets. While describing the cecidogenesis in relation to the biology of the gall maker, an attempt has been made to discuss the morphological convergence among shoot apex galls

On the development morphology of the leaf fold galls of Maytenus senegalensis (Lam) Excel!., (Celastraceae), induced by Alocothrips hadrocerus (Karny)(Thysanoptera:Insecta)

The galls of Maytenus senegalensis (=Gymnosporia heyneana Lawson) induced by Alocothrips hadrocerus are histologically unique when compared with the other thrip galls. Principal cecidogenetic phenomena are hypertrophy and hyperplasia. The incidence of tannin containing as well as sclerenchymatous cells, and the epidermal proliferation are discussed in relation to gall development

The dynamics and control of large flexible space structures, 8

A development of the in plane open loop rotational equations of motion for the proposed Spacecraft Control Laboratory Experiment (SCOLE) in orbit configuration is presented based on an Eulerian formulation. The mast is considered to be a flexible beam connected to the (rigid) shuttle and the reflector. Frequencies and mode shapes are obtained for the mast vibrational appendage modes (assumed to be decoupled) for different boundary conditions based on continuum approaches and also preliminary results are obtained using a finite element representation of the mast reflector system. The linearized rotational in plane equation is characterized by periodic coefficients and open loop system stability can be examined with an application of the Floquet theorem. Numerical results are presented to illustrate the potential instability associated with actuator time delays even for delays which represent only a small fraction of the natural period of oscillation of the modes contained in the open loop model of the system. When plant and measurement noise effects are added to the previously designed deterministic model of the hoop column system, it is seen that both the system transient and steady state performance are degraded. Mission requirements can be satisfied by appropriate assignment of cost function weighting elements and changes in the ratio of plant noise to measurement noise

The dynamics and control of large flexible space structures, part 7

A preliminary Eulerian formulation of the in-plane dynamics of the proposed spacecraft control laboratory experiment configuration is undertaken when the mast is treated as a cantilever type beam and the reflector as a lumped mass at the end of the beam. Frequency and mode shapes are obtained for the open loop model of the beam system and the stability of closed loop control systems is analyzed by both frequency and time domain techniques. Environmental disturbances due to solar radiation pressure are incorporated into models of controlled large flexible orbiting platforms. Thermally induced deformations of simple beam and platform type structures are modelled and expressions developed for the disturbance torques resulting from the interaction of solar radiation pressure. Noise effects in the deterministic model of the hoop/column antenna system are found to cause a degradation in system performance. Appropriate changes in the ratio of plant noise to the measurement noise and/or changes in the control weighting matrix elements can improve transient and steady state performance

A microfluidic chip based model for the study of full thickness human intestinal tissue using dual flow

© 2016 Author(s). The study of inflammatory bowel disease, including Ulcerative Colitis and Crohn's Disease, has relied largely upon the use of animal or cell culture models; neither of which can represent all aspects of the human pathophysiology. Presented herein is a dual flow microfluidic device which holds full thickness human intestinal tissue in a known orientation. The luminal and serosal sides are independently perfused ex vivo with nutrients with simultaneous waste removal for up to 72 h. The microfluidic device maintains the viability and integrity of the tissue as demonstrated through Haematoxylin & Eosin staining, immunohistochemistry and release of lactate dehydrogenase. In addition, the inflammatory state remains in the tissue after perfusion on the device as determined by measuring calprotectin levels. It is anticipated that this human model will be extremely useful for studying the biology and tes ting novel interventions in diseased tissue

Antiplatelet Drugs and Its Gastrointestinal Side Effects among Ischemic Stroke Patients in Dr. Hasan Sadikin General Hospital 2011

 Background: Antiplatelet drugs with known side effects are given in long term therapies to prevent secondary ischemic stroke. Gastrointestinal side effect is the most prevalent issue. The aim of this study was to identify which antiplatelet drugs have the most gastrointestinal side effects and the duration of administration. Methods: Seven hundred twenty six medical records were obtained from the Medical Record Department of Dr.Hasan Sadikin General Hospital Bandung from August to December 2011. Inclusion criteria were >18 years old and treated by long term antiplatelet drugs with complete medical records. Data analyzed descriptively consist of antiplatelet type, gastrointestinal effects, and drug administration duration. Results: Of 726 medical records only 246 were enrolled this study. Aspirin 80 mg was the most frequent drug given to ischemic stroke patients (65.9%). GI bleeding and nausea were the two side effects mostly found in aspirin >80 mg group (90%; 95% respectively). The side effects was found after less than 3 months in the aspirin >80 mg group, while it took longer to appear in clopidogrel 75 mg group. Conclusions: Aspirin (>80 mg) presents the most frequent gastrointestinal side effect compared to low dose aspirin 80 mg , clopidogrel, and combination of clopidogrel and aspirin.Keywords: Antiplatelet, ischemic stroke, side effects DOI: 10.15850/amj.v2n1.425