Synthesis of POPOP, a Scintillator Used In The Nuclear Radiation Detectors
Mojtaba
Moosavi
دانشگاه جامع امام حسین(ع)
author
Yousef
Moosavi
دانشگاه جامع امام حسین(ع)
author
Amir
Gholami
دانشگاه جامع امام حسین(ع)
author
text
article
2012
per
Scintillators are materials which exhibit scintillation – the property of luminescence when excited by ionizing radiation. Luminescent materials, when struck by an incoming particle, absorb its energy and scintillate. POPOP, 1,4-bis-(5-phenyl-oxazolyl-2)-benzene, is one of the organic scintillators that have applications in detecting the nuclear rays and charged particles. Hence, synthesise of POPOP have been focused and some synthetic methods have been investigated. A new and efficient method for the preparation of POPOP is presented in this paper. An intermediate was synthesized bye the reaction of 2-aminoacetophenone with terephethaloyl dichloride. The oxazole rings in the final product (POPOP) were then formed by the reaction of this intermediate with concentrated sulfuric acid yielding the final product.
Journal of Advanced Defense Science & Technology
Imam Hussein University
2676-2935
3
v.
1
no.
2012
5
11
https://adst.ihu.ac.ir/article_204048_2bab713b174b613879b67a970e8efa75.pdf
Software implementation of Ex-CFAR detector and determining optimum value for β parameter in marine environment
jahan
jamshidi
دانشگاه امام حسین
author
mohamad
alaee
دانشگاه امام حسین
author
abdollah
mahdloo
دانشگاه امام حسین
author
ali
naseri
دانشگاه امام حسین
author
text
article
2012
per
Presence of interfering signals in the samples used by a cell-averaging CFAR detector for estimation of the noise power can cause a drastic degradation in its performance. For alleviates the problem a detector proposed that excides strong signals before the cell-averaging operation and named Excision-CFAR. This detector suffers almost no degradation in performance, in comparison with a conventional cell-averaging detector, when it operates in an environment of homogeneous noise. In this paper we determine optimal values of excision parameter (β) of Ex-CFAR detector in different values of probability of false alarm. The values are obtained using simulation by MATLAB software. Then by using these values performance of the excision CFAR detector is analyzed in both a benign environment and in an environment of an arbitrary number of interferers in the samples. Then the results obtained from this detector are compared with the results of CA-CFAR detector. Swerling ш case for target fluctuation is used as a model for the received signal and only single pulse detection is considered.
Journal of Advanced Defense Science & Technology
Imam Hussein University
2676-2935
3
v.
1
no.
2012
9
16
https://adst.ihu.ac.ir/article_204049_9197d4e4043fa648f9bc30dda9926588.pdf
Separation of the Target and Flares in the Trackers by using the Frequency-Domain and Time-Domain Algorithms
Saeed
Olyaee
دانشگاه شهی n رجائی
author
Mohammad Reza
Moradian
دانشگاه شهی n رجائی
author
text
article
2012
per
The use of trackers and seeker systems has an important role in the electronic warfare. A simple and inexpensive method is based on the use of reticle devices in the trackers. But the most limitation factor for using the reticle systems is resulting from their sensitivity to false targets such as flares. There are various methods to separate the real target from flares such as dual-band detection method and blind source separation (BSS) method. In this paper, we present new algorithms of separating the real target and flares based on the BSS method. For this reason, we utilize FM reticle, and by using a beam splitter in the modified system, the main signals are extracted from the mixed signals (including the target and flare signals). The time-domain and frequency-domain algorithms are designed and compared in this approach.
Journal of Advanced Defense Science & Technology
Imam Hussein University
2676-2935
3
v.
1
no.
2012
17
27
https://adst.ihu.ac.ir/article_204050_60249901f8a956d906a64ccb4d9b1d75.pdf
A Method for Rapid Pitch-based Speaker Segmentation
Behrouz
Abdolali
دانشگاه امام حسین
author
Hossein
Sameti
دانشگاه صنعتی شریف
author
Mohammad Hossein
Ghezeayagh
دانشگاه امام حسین
author
text
article
2012
per
Speaker Diarization is the process of partitioning an input audio stream into homogeneous segments according to the speaker identity. Voice Activity Detection (VAD), speaker segmentation and speaker clustering are the main necessary parts of the Speaker Diarization systems. There are several methods for speaker segmentation. However, most of the Speaker Diarization Systems use BIC-based Segmentation methods. The main goal of this paper is to propose a new method for speaker segmentation with higher speed than the current methods - e.g. BIC - and acceptable accuracy. Our proposed method is based on the pitch frequency of the speech. The accuracy of this method is similar to the accuracy of common speaker segmentation methods. However, its computation cost is much less than theirs. We show that our method is about 2.4 times faster than the BIC-based speaker segmentation method, while the accuracy of pitch-based method is %71 which is about %1 higher than that of the BIC-based method.
Journal of Advanced Defense Science & Technology
Imam Hussein University
2676-2935
3
v.
1
no.
2012
29
38
https://adst.ihu.ac.ir/article_204051_172a53802f2817e9ce884cb0eefacebb.pdf
Implementation of DPIM MODEM with FPGA and Comparison of its Functionality with PPM MODEM
akbar
asghari varzaneh
دانشگاه جامع امام حسن (ع)
author
mohammad hossein
ghezel ayagh
دانشگاه جامع امام حسن (ع)
author
text
article
2012
per
Free Space Optic communications has received extensive interest over the past decade, and many potential applications for this technology have been suggested. Among various digital modulation formats for wireless optical links like OOK, PPM, DPIM and MDPIM, DPIM has got advantages in terms of transmission capacity, bandwidth requirement, power requirement and receiver design. DPIM displays a higher transmission capacity by eliminating all the unused time slots from within each symbol in PPM and result in decreased bandwidth requirement and possibility introducing some redundancy into the code for Security. Design of PPM receiver has more complexity compared to OOK and DPIM since both slot and symbol synchronizations are required at the receiver.
Journal of Advanced Defense Science & Technology
Imam Hussein University
2676-2935
3
v.
1
no.
2012
39
47
https://adst.ihu.ac.ir/article_204052_887f18dba6cb845b9fd9351ef0ba2abf.pdf
Shigella dysentery stxA mutant (E167Q-A231D-G234E) gene design and optimization of recombinant protein expression and purification
gholamreza
oulad
1-مرکز تحقیقات بیوتکنولوژی کاربردی، دانشگاه علوم پزشکی بقیه الله 2-مرکز تحقیقات زیست شناسی، دانشگاه امام حسین(ع)
author
mahmood
tavallai
- مرکز تحقیقات ژنتیک انسانی دانشگاه علوم پزشکی بقیه الله عج
author
firooz
ebrahimi
- مرکز تحقیقات زیست شناسی، دانشگاه امام حسین(ع)
author
jafar
amani
- مرکز تحقیقات بیوتکنولوژی کاربردی، دانشگاه علوم پزشکی بقیه الله عج
author
ali mohamad
latifi
- مرکز تحقیقات بیوتکنولوژی کاربردی، دانشگاه علوم پزشکی بقیه الله عج
author
text
article
2012
per
Abstract:
Objective: Shigella dysentery by producing shigatoxin (subunits A, B) is one of the most important human pathogenic intestinal bacteria. Entring to epithelial cells, the toxin inhibits protein synthesis leading to cell deat. In spite of great investigation on vaccine production against S.dysentery studying to achieve significant stxA recombinant protein still remains important.The objective of this study was designing mutant stxA gene and expressing protein production as vaccine candidate against stx for further immunization studies.
Methods: three stxA mutant gene including (E167Q-A231D-G234E) were designed and the synthetic gene in pET28a plasmid was obtained and confirmed by PCR. Thereafter the plasmid was transformed into the host cell E.coli BL21 DE3 after which gene expression was optimized and protein purity assay was then performe.
Results: preliminary studies led to mutant stop gene design after which it was confirmed by synthetic plasmid and PCR.The Expression of this gene in BL21 DE3 host cell was them optimized which was resulted in forming large amount of protein inclusion bodies.purification of inclusion bodies and protein solubilization was performed with a combinatorial method.
Conclusion and discussion: regarding the mechanism of shigatoxin effect and simultaneous use of two different mutations in this gene less toxicity is expected in comparison with previous mutants as vaccine candidate, posing a better vaccine candidate.
Journal of Advanced Defense Science & Technology
Imam Hussein University
2676-2935
3
v.
1
no.
2012
49
55
https://adst.ihu.ac.ir/article_204053_da8ec6e8c439a67d71b44cdda35acd7d.pdf
Planning of Covering and Minesweeping Operations for Multiple Robots in Unknown Environments
Ali
Mirdar Harijani
دانشگاه تربیت مدرس
author
Ellips
Masehian
دانشگاه تربیت مدرس
author
text
article
2012
per
Abstract – In parallel with advances in robots hardware, the motion planning science has become increasingly indispensable and complicated, and enables robots to enhance their capabilities in applications where the presence of humans is impractical or hazardous. The covering and minesweeping operations of outdoor areas are examples of such applications. This paper deals with the problem of covering and minesweeping of unknown environments by multiple mobile robots which have cooperative interactions. For searching the space, the new method of Multi Sensor-based Random Trees (MSRT) is developed, and for planning the robots’ paths toward the scattered items and their collection, a mathematical model similar to the Multiple Traveling Salesman Problem is proposed, which together with the k-means clustering, the A* search, and the Visibility Graph techniques plans the route of each robot. Comparisons with the counterpart mathematic model solved to optimality showed that the proposed method produces suboptimal solutions in much shorter computational times.
Journal of Advanced Defense Science & Technology
Imam Hussein University
2676-2935
3
v.
1
no.
2012
57
71
https://adst.ihu.ac.ir/article_204054_d8f22666c080417c1b6ab083e91a1e38.pdf
Surface processing of cellulose and PVDF supports for immobilization of antibody for diagnostic application
Mohammad
Heiat
دانشگاه علوم پزشکی بقیه الله (عج)
author
Ali mohammad
Latify
دانشگاه علوم پزشکی بقیه الله (عج)
author
Morteza
Mirzaei
دانشگاه علوم پزشکی بقیه الله (عج)
author
text
article
2012
per
The immobilization of antibodies is one of the most important steps for the construction of biological diagnostic systems. Cellulose and PVDF are commonly used as supports for antibody immobilization despite their low efficiency. This study investigates the activation process of these supports in order to improve their immobilization capability. So as to apply a more operative immobilization of antibody, Cellulose and PVDF were initially treated by cyanogen bromide and methanol respectively. In cellulose support which was treated by cyanogen bromide, the –OH groups constructed a cyclic imidocarbamate which is disposed to react with the amine groups of the antibody. In PVDF which was activated by methanol, hydrophilic property and surface adsorption were increased. After the activation procedure, anti-human antibody was immobilized on both supports and the immobilization quality was evaluated. The results showed that the applied changes on the supports had promising effects on the antibody capturing capacity. It was also shown that antibodies were more immobilized on the cellulose supports in comparison to PVDF. The activation processes can alter the physiochemical features of the support such as capillarity, flexibility, surface charges and delicacy, which may intensively influence the quality of immobilization.
Journal of Advanced Defense Science & Technology
Imam Hussein University
2676-2935
3
v.
1
no.
2012
73
79
https://adst.ihu.ac.ir/article_204055_dd723a2462ad64129725fd49ecfdaa40.pdf
Detecting Buried Underground Structures Using Simulation of Gravity Data
Habib
Sahami
دانشگاه صنعتی مالک اشتر
author
Mohammad Yaser
Radan
پژوهشکده بین المللی زلزله شناسی و مهندسی زلزله
author
Davood
Majidi
دانشگاه صنعتی مالک اشتر
author
text
article
2012
per
Abstract: Geophysical methods are used as locating tools and reconnaissance methods. Gravity method is used to locate underground structures and cavities using density contrast. In this paper, methods of airborne gravimetry and airborne gravity gradiometry, corrections and modern instruments of these methods have been presented. In order to evaluate the accuracy and efficiency of these methods, given a developed program, artificial data of an underground structure have been provided by forward modeling. Artificial data have been provided for earth surface and different altitude heights & then noise were added to data. Finally the results of the simulation and the accuracy of the presented instruments for different altitude heights have been compared. In conclusion effective solutions to mitigate the probable detection of buried structures and the improvement of camouflage processes aginst airborne reconnaissance are provided.
Journal of Advanced Defense Science & Technology
Imam Hussein University
2676-2935
3
v.
1
no.
2012
81
94
https://adst.ihu.ac.ir/article_204056_648f0ca131e31009959410e34b306a3c.pdf