Pressure Transient Behavior of Immiscible Water-Alternating-Gas (IWAG) Injection Well with and without Skin Effect

Pressure transient analysis could provide valuable information on the characterization and evaluation of reservoir. Previous studies have shown critical analysis of injection and falloff tests of water or gas injection wells. Existing pressure transient study conducted on immiscible water-alternating-gas (IWAG) injection wells mainly focused on falloff test without considering the presence of skin near the wellbore region. The objective of this study is to analyze the pressure transient behavior of IWAG injection and falloff test with and without skin effect using simulated data. Presence of skin near the wellbore region could adversely affect the pressure behavior of reservoir. Likewise, the pressure transient behavior will provide useful information in reservoir characterization study. ECLIPSE 100 is used to simulate the reservoir model under different mobility condition with the presence of skin for a water-oil system only since gas-oil system is always unfavorable

The analysis of aphasia prophils associated with subcortical lesions

Dominant hemisferin subkortikal lokalizasyonlu değişik patolojilerinde farklı tiplerde afaziler hakkında son yıllarda çok sayıda klinik çalışmalar bildirilmiştir. Çalışmamızda subkortikal bölge lezyonları ile ortaya çıkan farklı afazi tipi gösteren 13 olguda kranial komputerize tomografide (CT) saptanan lezyon ,lokalizasyon ile afazi testi sonucu elde edilen afazi tipleri arasındaki ilişki incelenmiştir.Numerous clinical trials have been reported about the different types of aphasias in variable subcortical localized pathologies of the dominant hemisphere. In our study we investigated 13 cases that had different types of aphasia which resulted from variable subcortical lesions. The relationship between the lesion localization in cranial CT and the types of aphasia that were evaluated by the aphasia test were analysed

Invasive plants in the Malaysian landscape

The increasing use of exotic plants for urban landscaping has presented a new threat to the local ecosystems when the newly introduced plant species thrive out of control—i.e., becoming invasive—in the new environment. If left unchecked, they are capable of displacing local plants; and thereby, causing a disruption to the local ecosystems. The disruptions can contribute to permanent changes to local and regional landscape characteristics, which in turn, will threaten agricultural, recreational as well as tourism potentials of a country. This paper highlights the threat and suggests methodologies for the prevention, management and eradication of these invasive plants

Development of Wireless Electronic Nose Using NRF24L01 RF Transceiver for Toxic Gases Monitoring

Exposure to toxic gases will affect the well-being of people in the nearby area if it is not carefully monitored. This study proposes a Wireless Electronic Nose (e-nose) System to monitor some toxic gases, temperature and humidity in the environment. The environment is monitored by using four units of wireless e-nose known as node, positioned at pre-determined locations. The node consists of toxic gases sensors as well as temperature and humidity sensor that acquired data from the environment in 30 minutes interval. The acquired data is sent wirelessly to the main node through NRF24L01 Radio Frequency (RF) transceiver. The main node transmits the data to a web of things system via Mobile Communication/General Radio Packet Service (GSM/GPRS) module. The acquired data is analysed using Principal Component Analysis (PCA), Hierarchical Cluster Analysis (HCA) and Radial Basis Function (RBF) of the Artificial Neural Network (ANN). Initial result shows that the system is able to monitor the toxic gases in the testing area

Pressure Transient Behavior of Immiscible Water-Alternating-Gas (IWAG) Injection Well with and without Skin Effect

Pressure transient analysis could provide valuable information on the characterization and evaluation of reservoir. Previous studies have shown critical analysis of injection and falloff tests of water or gas injection wells. Existing pressure transient study conducted on immiscible water-alternating-gas (IWAG) injection wells mainly focused on falloff test without considering the presence of skin near the wellbore region. The objective of this study is to analyze the pressure transient behavior of IWAG injection and falloff test with and without skin effect using simulated data. Presence of skin near the wellbore region could adversely affect the pressure behavior of reservoir. Likewise, the pressure transient behavior will provide useful information in reservoir characterization study. ECLIPSE 100 is used to simulate the reservoir model under different mobility condition with the presence of skin for a water-oil system only since gas-oil system is always unfavorable

Electrical appliances protection using auto cut under voltage and over voltage tripping mechanism

Power quality is a term that refers to maintaining the near sinusoidal waveform of power distribution bus voltages and current at rated magnitude and frequency. The most common types of power quality problem are voltage sag, harmonic distortion, voltage spike, noise, under voltage and over voltage. The development of a low voltage and high voltage tripping mechanism where studied to protect the load from damage due to under voltage and over voltage problem. In this study, an auto-cut circuit has been designed using relay, transistor, operational amplifier and other discrete component and a lamp was used as a load to confirm the circuit successfully operated. The results show that when the supply in under voltage condition, the load will turn OFF when the supply voltage below 210 V. When the supply voltage rises above 240 V the load will turn OFF and it show overvoltage condition. The advantage of this protection circuit is to protect load from the fluctuation of voltage that can cause damage to load. The GSM modem can be used as a path to send message/alert to user via SMS in future

Paroxysmal Amnesia Attacks due to Hashimoto’s Encephalopathy

Hashimoto’s encephalopathy is a rare disease which is thought to be autoimmune and steroid responsive. The syndrome is characterized by cognitive impairment, encephalopathy, psychiatric symptoms, and seizures associated with increased level of anti-thyroid antibodies. The exact pathophysiology underlying cerebral involvement is still lesser known. Although symptoms suggest a nonlesional encephalopathy in most of the cases, sometimes the clinical appearance can be subtle and may not respond to immunosuppressants or immunomodulatory agents. Here we report a case who presented with drowsiness and amnestic complaints associated with paroxysmal electroencephalography (EEG) abnormalities which could be treated only with an antiepileptic drug

i-Eclat: performance enhancement of eclat via incremental approach in frequent itemset mining

One example of the state-of-the-art vertical rule mining technique is called equivalence class transformation (Eclat) algorithm. Neither horizontal nor vertical data format, both are still suffering from the huge memory consumption. In response to the promising results of mining in a higher volume of data from a vertical format, and taking consideration of dynamic transaction of data in a database, the research proposes a performance enhancement of Eclat algorithm that relies on incremental approach called an Incremental-Eclat (i-Eclat) algorithm. Motivated from the fast intersection in Eclat, this algorithm of performance enhancement adopts via my structured query language (MySQL) database management system (DBMS) as its platform. It serves as the association rule mining database engine in testing benchmark frequent itemset mining (FIMI) datasets from online repository. The MySQL DBMS is chosen in order to reduce the preprocessing stages of datasets. The experimental results indicate that the proposed algorithm outperforms the traditional Eclat with 17% both in chess and T10I4D100K, 69% in mushroom, 5% and 8% in pumsb_star and retail datasets. Thus, among five (5) dense and sparse datasets, the average performance of i-Eclat is concluded to be 23% better than Eclat

Estimation of uncertainty from method validation data: application to a reverse-phase high-performance liquid chromatography method for the determination of amino acids in gelatin using 6-aminoquinolyl-N-hydroxysuccinimidyl carbamate reagent

A detailed procedure for estimating uncertainty according to the Laboratory of Government Chemists/Valid Analytical Measurement (LGC/VAM) protocol for determination of 18 amino acids in gelatin is proposed. The expanded uncertainty was estimated using mainly the method validation data (precision and trueness). Other sources of uncertainties were contributed by components in standard preparation measurements. The method scope covered a single matrix (gelatin) under a wide range of analyte concentrations. The uncertainty of method precision, μ(P) was 0.0237–0.1128 pmol μl−1 in which hydroxyproline and histidine represented the lowest and highest values of uncertainties, respectively. Proline and phenylalanine represented the lowest and highest uncertainties value for method recovery, μ(R) that was estimated within 0.0064–0.0995 pmol μl−1. The uncertainties from other sources, μ(Std) were 0.0325, 0.0428 and 0.0413 pmol μl−1 that were contributed by hydroxyproline, other amino acids and cystine, respectively. Hydroxyproline and phenylalanine represented the lowest and highest values of expanded uncertainty, U(y) that were determined at 0.0949 and 0.2473 pmol μl−1, respectively. The data were accurately defined and fulfill the technical requirements of ISO 17025:2005