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"Dilemnas of identity in contemprorary life"

"Saturated switching systems treats the problem of actuator saturation, inherent in all dynamical systems by using two approaches: positive invariance in which the controller is designed to work within a region of non-saturating linear behaviour and saturation technique which allows saturation but guarantees asymptotic stability. The results obtained are extended from the linear systems in which they were first developed to switching systems with uncertainties, 2D switching systems, switching systems with Markovian jumping and switching systems of the Takagi-Sugeno type. The text represents a thoroughly referenced distillation of results obtained in this field during the last decade. The selected tool for analysis and design of stabilizing controllers is based on multiple Lyapunov functions and linear matrix inequalities. All the results are illustrated with numerical examples and figures many of them being modelled using MATLAB®. "

"internal curing is promoted as a way tpo mitigate autogenous shrinkage in high-performance concrete having a low water binder ratio (w/b). Different methods of internal curing have been proposed. In this study, the effect of substituting 20% of normalweight sand by an equal mass of lightweight sand on the development of shrinkage was investigated on a 0.35 w/b high performance concrete . Shrinkage was monitored using vibrating wire gauges cast at the center of 100x100x400 mm (4x4x16 in.) concrete samples. Two samples were sealed with self-adhesive aluminum foil to present a closed curing system without any exchanged of humidity between the concrete and its environment, After demolding at the age if 23 to 25 hours. two other samples were cured under water for 6 days . Thereafter these two samples were removed from water and maintained at 23 C (73 F ) and a 50% relative humidity (RH) Environment . Experimental results clearly demonstrate the effeciency of a 20% substitution of normalweight by a lightweight sand to reduce autogenous and drying shrinkage . The Incorporation of 20% lightweight sand did not significantly affect the 28-day compressive strength. The cementitious matrix presented low chloride ion permeability. Internal curing through the use of partial replacement of normalweight sang by lightweight sand definitely represent and efficient method to diminish autogenous and drying shrinkage in low w/b concretes where external water curing does not allow in-depth curing of concrete"

"Pengelolaan Sumber Daya Air perlu mengidentifikasi kawasan lindung dan budidaya atau discharge-recharge area. Setiap kawasan ini memilki kelebihan dan kekurangan tersendiri relatif terhadap kepentingan yang ada. Tidak jarang terjadi konflik kepentingan dalam penetapan kawasan ini sehingga penetapan batas antara discharge-recharge area menjadi sangat krusial. Penetapan discharge-recharge area dapat dilakukan dengan menggunakan simulasi groundwater flow dengan memperhatikan sisi karakteristik air tanah. Pada penelitian ini, penulis berusaha melakukan identifikasi discharge-recharge area dengan program model dua dimensi elemen hingga saturated-unsaturated. Diketahui bahwa program model dua dimensi saturated adalah model yang lebih sederhana sehingga program model ini lebih murah. Akan tetapi, dalam penggunaannya program model ini terbukti tidak dapat dipakai untuk penetapan discharge-recharge area karena tidak mampu mengakomdasi terjadinya simulasi aliran air tanah yang mampu menembus muka air tanah. Hal ini merupakan konsep dasar yang harus terpenuhi. Program model yang mampu mengakomodasi hal ini adalah program model dua dimensi saturated-unsaturated.

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Water Resources Management need to identify groundwater conservation and cultivation area or discharge-recharge area. Each area has its own advantages and disadvantages relative to interest. There are often happen a confilct of interest caused by determination of this area, so that the determining boundary discharge-recharge area become crucial. Determination of discharge-recharge area can be done using groundwater flow simulation by considering the groundwater characteristics. In this study, the author attemped to identify discharge-recharge area using two dimensional saturated-unsaturated finite element program model. It is known that two dimensional saturated program model is simpler program model so that the it is less expensive model. However, this program model is proven can not be used to determine discharge-recharge area because it is can not accomodate the simulation that groundwater flow is able to penetrate."

" ABSTRAKFlotasi merupakan metode pemeriksaan feses untuk mendiagnosis infeksi cacing usus. Larutan yang dipakai dalam metode flotasi bervariasi. Penelitian ini menggunakan desain cross sectional dengan sampel feses yang ada di Laboratorium Parasitologi FKUI. Sampel diperiksa dengan metode flotasi larutan gula jenuh dan NaCl jenuh dengan tujuan membandingkan efektivitas kedua larutan. Uji Wilcoxon mendapatkan adanya perbedaan bermakna antara gula jenuh dan NaCl jenuh dalam mendeteksi telur Ascaris lumbricoides p = 0,002 dan Trichuris trichiura p = 0,002 . Rerata telur yang ditemukan gula jenuh untuk A. lumbricoides ialah 3.346,9/gram dan untuk T. trichiura ialah 149,2/gram. Jika dibandingkan dengan rerata telur yang ditemukan NaCl jenuh ialah 1.385,2/gram untuk A. lumbricoides dan 35,2/gram untuk T. trichiura maka gula jenuh lebih baik dalam mendeteksi telur cacing usus. Hal ini disebabkan berat jenis larutan gula jenuh yang dapat menjangkau kisaran berat jenis telur untuk telur dapat mengapung. Berbeda dengan gula jenuh, NaCl jenuh tidak dapat mengapungkan telur yang berat jenisnya melebihi berat jenis larutan. Oleh karena itu, gula jenuh dapat direkomendasikan untuk dijadikan larutan rutin menggantikan NaCl jenuh dalam pemeriksaan feses metode flotasi.

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ABSTRACTFlotation is a method in stool examination to diagnose infection of intestinal helminths. Solutions was used in flotation method vary. This study used cross sectional design with stool samples in Laboratory of Parasitology FKUI. Sampels are examined by flotation of saturated sugar and saturated NaCl with aim of this study was to compare effectiveness both solutions. Wilcoxon test showed significantly different between saturated sugar solution and saturated NaCl solution in detecting eggs of Ascaris lumbricoides p 0,002 and Trichuris trichiura p 0,002 . Mean of eggs that found by saturated sugar for A. lumbricoides was 3.346,9 gram and for T. trichiura was 149,2 gram. If these were compared with mean of eggs that found by saturated NaCl that was 1.385,2 gram for A. lumbricoides and 35,2 gram for T. trichiura, saturated sugar is better than saturated NaCl in detecting eggs of intestinal helminths. It was caused by saturated sugar rsquo s specific gravity can cover range of eggs rsquo specific gravity so eggs could float. Unlike saturated sugar, saturated NaCl could not float the eggs that have specific gravity more than solution rsquo s specific gravity. Therefore saturated sugar can be recommended to be used as a routine solution replaces saturated NaCl in stool examination flotation method."

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Aterosklerosis adalah fenomena penyempitan arteri karena penumpukan plak di dinding arteri sebagai akibat dari suatu pola hidup tidak sehat. Menurut pendekatan ilmu sosial, pola hidup yang salah dapat ditularkan kepada orang lain disekitarnya. Bentuk penanganan pasien aterosklerosis adalah melalui operasi bypass yang harus dilakukan oleh dokter spesialis dan di rumah sakit tertentu, yang keduanya memiliki jumlah yang terbatas. Jika jumlah pasien dengan komplikasi aterosklerosis terus bertambah, itu akan berdampak pada pengobatan yang tidak lagi optimal. Penelitian ini bertujuan untuk membangun model penyebaran aterosklerosis tanpa dan dengan mempertimbangkan pengaruh keterbatasan sumber daya rumah sakit, yang dikenal sebagai efek saturasi. Kedua model dibentuk dengan membagi kompartemen manusia dalam populasi yang rentan, terinfeksi aterosklerosis, dan penderita aterosklerosis yang menjalani pengobatan. Model-model yang telah dibangun kemudian dianalisis secara analitik dan numerik. Studi analitik dilakukan untuk menemukan dan menganalisis titik keseimbangan, menentukan bilangan reproduksi dasar (R0), dan menyelidiki keberadaan bifurkasi dari model yang dibangun. Bifurkasi maju, mundur dan maju dengan hysteresis muncul dari model yang telah terbentuk. Hasil analitik didukung oleh simulasi numerik terkait elastisitas dan sensitivitas R0 serta simulasi autonomous.

 

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Atherosclerosis is a narrowing of the arteries due to the buildup of plaque on the artery walls resulting from an unhealthy lifestyle. According to the social science approach, the wrong lifestyle can be ”infection” to other people. The form of treatment for atherosclerosis patients is through bypass surgery, which must be performed by specialists and in specific hospitals, both of which have a limited number. If the number of patients with atherosclerosis complications continues to increase, it will result in no longer optimal treatment. This study aims to build a model of atherosclerosis spread without and taking into account the effect of limited hospital resources, known as the saturation effect. Both models were formed by dividing the human compartment into populations susceptible, infected with atherosclerosis, and people with atherosclerosis who are undergoing treatment. The models that have built are then analyzed analytically and numerically. Analytical studies carried out to find and analyze the equilibrium point, determine the basic reproduction number (R0), and investigate the existence of a bifurcation of the built model. Forward bifurcation, backward bifurcation, and forward bifurcation with hysteresis appear from the model that has formed. The analytical results supported by numerical simulations related to elasticity and sensitivity of R0 as well as autonomous simulations.

 

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