Control Implementation in Bioprocess System: A Review.

Bioprocess control consists of establishing a strategy for the management of the biocatalyst environment. Bioprocesses include several different units in which a near optimal environment is desired for microorganisms to grow, multiply, and produce a desired product

Online Implementation Of Imc Based Pid Controller In Batch Esterification Reactor.

Esterification is one of important process that operates in a batch reactor. Since the inherent nonlinear properties of this batch reactor, the control of such reactor to ensure an efficient operation remains a great challenge

Temperature Control in Polyvinyl Chloride Production: Internal Model Control (IMC) and Proportional, Integral and Derivative (PID) controller Implementation.

The Polyvinyl Chloride (PVC) suspension polymerization process is an exothermic reaction which is carried out in a batch reactor

PID Controller for Batch Process using MATLAB-Simulink-Real-Time-Windows Target

The difficulties in implementing a controller in the real process leads to the practice of a real-time user-friendly simulator programming. This paper presents the application of the Simulink model as a Graphical User Interface (GUI) for signal visualization and parameter tuning in the real-time implementations

Bound States and Scattering Processes in the ^4He_3 Atomic System

We present a mathematically rigorous method for solving three-atomic bound state and scattering problems. The method is well suited for applications in systems where the inter-atomic interaction is of a hard-core nature. It has been employed to obtain the ground- and excited-state energies for the Helium trimer and to calculate, for the first time, the scattering phase shifts and wave-functions for the He atom-He dimer at ultra-low energies.Comment: 9 pages, main file 21 kB, 1 eps and 4 ps figure

KEANEKARAGAMAN FUNGI MIKORIZA ARBUSKULA (FMA) PADA RIZOSFER TANAMAN PEGAGAN (Centella asiatica (L.) Urban)

ABSTRAKDefisiensi hara fosfor (P) menjadi salah satu faktor pembatas dalamsistem produksi pertanian di Indonesia yang umumnya diusahakan padatanah-tanah masam. Pemanfaatan fungi mikoriza arbuskula (FMA)merupakan salah satu alternatif dalam menanggulangi permasalahan padatanah masam, karena FMA dapat membantu tanaman menyerap unsur Pdan unsur hara lainnya dari dalam tanah. Untuk mempelajari potensi FMA,hal pertama yang harus diketahui adalah keanekaragaman dari organismetersebut. Dengan adanya data tentang keanekaragaman FMA, maka dapatdilakukan seleksi guna mendapatkan isolat FMA yang potensial danefektif dalam meningkatkan pertumbuhan dan produktivitas tanamanpegagan. Penelitian ini bertujuan untuk mengisolasi dan mengidentifikasijenis-jenis FMA pada rizosfer tanaman pegagan. Penelitian dilaksanakanbulan Januari sampai Agustus 2008. Pengambilan contoh tanah dilakukanpada tiga lokasi pertanaman pegagan di Kebun Percobaan Gunung Putri,Sukamulya, dan Cicurug, sedangkan isolasi, identifikasi, dan pemerang-kapan spora dilakukan di Laboratorium Ekofisiologi dan rumah kaca BalaiPenelitian Tanaman Obat dan Aromatik Bogor. Hasil penelitianmenunjukkan bahwa sebelum pemerangkapan diperoleh 2 genus (Glomusdan Acaulospora) pada contoh tanah di KP Gunung Putri, 3 genus(Glomus, Acaulospora dan Scutellospora) di KP Sukamulya, dan 2 genus(Glomus dan Acaulospora) di KP Cicurug. Setelah dilakukan trappingjenis FMA, di KP Gunung Putri didapatkan 5 jenis FMA (4 tipe Glomusdan 1 tipe Acaulospora), di KP Sukamulya terdapat 5 jenis FMA (3 tipeGlomus, 1 tipe Acaulospora, dan 1 tipe Scutellospora), dan di KP Cicurugterdapat 4 jenis FMA (3 tipe Glomus dan 1 tipe Acaulospora).Keanekaragaman FMA pada rizosfer pertanaman pegagan cukup beragamdan berpotensi dimanfaatkan untuk meningkatkan efisiensi pemupukan,khususnya ketersediaan dan serapan hara P.Kata kunci : Centella asiatica (L.) Urban, keanekaragaman, fungimikoriza arbuskula (FMA), pegaganABSTRACTArbuscular Mycorrhizae Fungi (AMF) diversity on asiaticpennywort Centella asiatica (L.) Urban) rhizosphereDeficiency of phosphorus (P) is one of the limiting factors ofagricultural production system in Indonesia which is generally managed onacid soils. Utilizing arbuscular mycorrhizae fungi (AMF) is one of thealternative solutions on acid soils problem, because of its ability to take upP and other nutrients from soils. The first concern which must be studied isdiversity of the organism. Data on AMF diversity obtained is useful toselect potential and effective AMF by increasing plant growth andproduction of asiatic pennywort. The aim of this research was to isolateand identify types of AMF in asiatic pennywort rhizosphere. The experi-ment was conducted from January until August 2008. Soil samples weretaken from three locations of asiatic pennywort plantations i.e. GunungPutri, Sukamulya, and Cicurug experimental stations. Isolation, identifi-cation, and trapping of spore were conducted at the Eco-physiology labo-ratory and glasshouse of Indonesian Medicinal and Aromatic CropsResearch Institute (IMACRI), Bogor. The laboratory results of soil sam-ples before trapping showed that there were two genus of AMF spores(Glomus and Acaulospora) in the samples from Gunung Putri, three genus(Glomus, Acaulospora, and Scutellospora) from Sukamulya, and twogenus (Glomus and Acaulospora) from Cicurug. After trapping, it wasidentified that the soil samples from Gunung Putri, Sukamulya, andCicurug contained five AMF species (four types of Glomus and one typeof Acaulospora), five AMF species (three types of Glomus, one type ofAcaulospora and Scutellospora), and four AMF species (three types ofGlomus and one type of Acaulospora) from Cicurug. Diversity of AMFvariety can be utilized to get potential to increase the efficiency offertilizer, specifically availability and uptake of nutrient P.Key words : Centella  asiatica  (L.)  Urban,  diversity,  ArbuscularMycorrhizae Fungi (AMF), asiatic pennywor

Monte Carlo Calculations for Liquid 4^4He at Negative Pressure

A Quadratic Diffusion Monte Carlo method has been used to obtain the equation of state of liquid $^4$He including the negative pressure region down to the spinodal point. The atomic interaction used is a renewed version (HFD-B(HE)) of the Aziz potential, which reproduces quite accurately the features of the experimental equation of state. The spinodal pressure has been calculated and the behavior of the sound velociy around the spinodal density has been analyzed.Comment: 10 pages, RevTex 3.0, with 4 PostScript figures include

A comparison study of perceived stress and quality of life among Master of Pharmacy and non-pharmacy master's students

Background: Postgraduate students often live with an excessive amount of stress, which can have negative academic, emotional and health-related outcomes.Aim: To examine perceived stress and health-related quality of life (HRQOL) among Master of Pharmacy (MPharm) students compared to non-pharmacy master's students (Non-MPharm). Method: The Perceived Stress Scale (PSS), SF-12v2 survey and a questionnaire instruments were used to measure stress, HRQOL and factors that MPharm students believed produced and alleviated stress, respectively. Results: One hundred percent of MPharm students (n=26) and 88% of Non-MPharm students (n=100) participated in this study. The mean PSS scores were insignificantly different between the MPharm students and Non-MPharm students. Negative correlations were found between stress and mental and physical HRQOL in MPharm students. However, only negative correlation between stress and mental HRQOL in Non-MPharm students. Conclusion: MPharm students reported relatively lower levels of stress and mental HRQOL than Non-MPharm students did

Short time evolved wave functions for solving quantum many-body problems

The exact ground state of a strongly interacting quantum many-body system can be obtained by evolving a trial state with finite overlap with the ground state to infinite imaginary time. In this work, we use a newly discovered fourth order positive factorization scheme which requires knowing both the potential and its gradients. We show that the resultaing fourth order wave function alone, without further iterations, gives an excellent description of strongly interacting quantum systems such as liquid 4He, comparable to the best variational results in the literature.Comment: 5 pages, 3 figures, 1 tabl

Ectoparasites of murids in peninsular Malaysia and their associated diseases

A considerable number of rat-borne ectoparasite studies have been conducted since the early 1930s in the Malayan Peninsula (now known as peninsular Malaysia). The majority of studies were field surveys and collections of specimens across the region, and were conducted primarily to catalogue the ectoparasite host distribution and discover novel species. This has generated a signification amount of information, particularly on the diversity and host distribution; other aspects such as morphology, host distribution and medical significance have also been investigated. Amongst the four main groups (mites, fleas, ticks, lice), rat-borne mites have received the most attention with a particular emphasis on chiggers, due to their medical importance. More recent studies have examined the distribution of ectoparasites in rats from different habitat type simplicating a high prevalence of zoonotic species infesting rat populations. Despite being capable of transmitting dangerous pathogens to human, the health risks of rat-borne ectoparasites appear to be small with no serious outbreaks of diseases recorded. Although an extensive number of works have been published, there remain gaps in knowledge that need to be addressed, such as, the distribution of under studied ectoparasite groups (listrophorids and myobiids), determining factors influencing infestation, and understanding changes to the population distribution over time