Judul: Analysis of the NERA Model (Non-Users, Experimental-Users, Recreational-Users, And Addicted-Users) for a Population of Drug Users
Abstrak: Model NERA adalah model matematika yang menggambarkan hubungan antara bukan pengguna pengguna coba-coba, pengguna untuk kesenangan/rekreasi dan pengguna yang kecanduan obat-obatan terlarang. Dalam penelitian ini ditunjukkan bahwa untuk menurunkan banyaknya populasi yang coba-coba obat terlarang dan populasi pengguna untuk kesenangan/rekreasi, dapat dilakukan dengan beberapa cara. Cara yang dilakukan adalah: (i) meningkatkan laju pertumbuhan populasi bukan pengguna obat terlarang, (ii) menurunkan laju pertumbuhan populasi yang coba-coba obat terlarang, (iii) mengurangi tingkat interaksi antara populasi bukan pengguna dengan populasi yang coba-coba, dan (iv) meningkatkan tingkat pengaruh pengguna yang sudah kecanduan terhadap pengguna yang coba-coba., The NERA model is a mathematical model that describes the relationship between non-users, experimental-users, recreational-users and addicted-users. In this study it was shown that to reduce the number of experimental-users and population of recreational-users, can be done in several ways. The methods are: (i) increase the rate of growth of non-users, (ii) decrease the rate of growth of the population of experimental-users trials, (iii) reduce the rate of interaction between non-users populations and experimental-users, and (iv) increase the level of influence of addicted-users to experimental-users.
Keyword: NERA, drugs-user, stability

Judul: Pengembangan Model Penyebaran Pengguna Narkoba White-Comiskey
Abstrak: This thesis aims to discuss and analyze mathematical models of the spread of drug users based on the model of White and Comiskey (2007). In this model, population is divided into three classes, namely susceptibles, drug users, and drug users undergoing treatment. The model has three equilibrium points, i.e. one drug free and two endemic points. The stability of those points are determined according to the eigenvalues of the Jacobian matrices. The existence of the drug users are then controlled by a basic reproduction number. If the basic reproduction number is less than one, then the number of drug users will gradually decrease and disappear from the population. On the other hand, if the basic reproduction number is greater than one, then the number of drug users will gradually increase so that a number of drug users will stay in the population. In this thesis, the dynamical analysis of interaction between drug users and susceptible and the simulation was performed by varying the probability of becoming a drug user (β1) and the portion of drug users who enter treatment (ρ). In the former case, decreasing of β1 can be undertaken by government through law enforcement, no-drug campaign, etc. While in the later case, increasing of ρ can be done by improving government, family, and society initiative for saving drug users.
Keyword: 

Judul: Sintesis Giant Dielectric CaCu3Ti4O12 Dengan Hidrotermal Menggunakan Cangkang Telur Sebagai Sumber Ca
Abstrak: In this research the synthesis of CCTO by using hydrothermal method from Chicken Eggshells as Source of Ca had been done. Sample was calcined at 900 ° C for 8 hours then sintered at various temperature from 950 ° C and 1050 ° C for 12 hours. Samples were characterized by using XRD and showed that CCTO formed match with the JCPDS data (pattern 21-0140). The results of LCR meter in the frequency range of 100Hz to 10KHz indicated that CCTO with sintering temperature of 950 ° C has a dielectric constant of ~ 33000 at a frequency of 100Hz and tan δ ~ 1.80 at the same frequency. While the sintering temperature of 1050 ° C decreased CCTO dielectric constant (~ 3031) at a frequency of 100Hz, with value of tan δ ~ 4.95. Sintering temperature variation also resulted in changes of CCTO microstructure. At the sintering temperature of 950 ° C the microstructure of CCTO has small grains (~0.058 μm) and a uniform grain size distribution, while the sintering temperature of 1050 ° C sample CCTO has a larger grain size (~0.0703μm).
Keyword: Bogor Agricultural University (IPB), Hydrothermal., Giant Dielectric Constant, Egg shell, CaCu3Ti4O12