Sintesis Poli N-Isopropilakrilamida (PNIPA)/Polityrosin (PTYR) Interpenetrating Polymer Networks (IPNs) Bertanda Iodium-125

Saat ini perkembangan polimer telah semakin maju, berbagai aplikasi polimer telah dikembangkan baik di sektor energi, pangan maupun kesehatan. PNIPA/PTYR IPNs bertanda iodium-125 dapat dimanfaatkan sebagai sumber terapi kanker. PNIPA/PTYR merupakan polimer peka temperatur. Tujuan dari penelitian ini adalah sintesis PNIPA/PTYR IPNs bertanda iodium-125. Polityrosin ditandai dengan iodium-125 kemudian secara simultan direaksikan dengan monomer N-isopropilakrilamida melalui polimerisasi radikal bebas dengan inisiator amonium persulfat (APS) dan tetrametiletilenediamin (TEMED) untuk memperoleh PNIPA/PTYR IPNs bertanda iodium-125. Kemurnian radiokimia PNIPA/PTYR IPNs bertanda iodium-125 diukur dengan krom atografi lapis tipis (KLT) dengan fasa gerak 2 propanol: 1 butanol: 0,2 M NH4OH. Selain Itu, stabilitas PNIPA/PTYR IPNs bertanda iodium-125 diuji pada media air. PNIPA/PTYR IPNs telah berhasil ditandai dengan iodium-125 dengan rendemen penandaan sebesar 37,6 ± 4,2 % (n = 3). Hasil pengamatan visual, ditunjukkan bahwa polimer mengalami Perubahan sifat pada temperatur 32 oC sampai dengan 34°C. Hasil H-NMR hanya menunjukkan spektrum dari polimer PNIPA. Berdasarkan pemeriksaan KLT, kemurnian radiokimia PNIPA/PTYR IPNs bertanda iodium-125 adalah 95,93%. Pengujian stabilitas polimer bertanda iodum-125 pada media air pada T = 37°C selama 2 minggu menunjukkan bahwa iodium-125 yang masih tertahan pada polimer adalah 71,3 ± 6,2 %

Parenting interventions for ADHD: a systematic literature review and meta-analysis

Objective. To evaluate the evidence base relating to the effectiveness of parent-administered behavioral interventions for ADHD

The association between nicotine dependence and smoking practices among Malay male smokers working in Selangor municipalities

Introduction: Nicotine dependence develops over time. It radically contributes to adverse health effects and influences smoking cessation. Globally the prevalence of current nicotine dependence has been reported as being between 46 to 53 percent. Nicotine dependence is associated with many factors, one of which is smoking practices. Methods: This cross sectional study was conducted among 112 Malay male smokers working in two selected municipal council. Smokers were identified and then randomly selected. Nicotine dependence was assessed using Fagerstrom Test for Nicotine Dependence (FTND). Smoking practices and data on respondents’ characteristics were collected using a validated self-administered questionnaire. Results: The percentage of high nicotine dependence among this study population is 37.56%. Nicotine dependence is significantly associated with current smoking practices (number of cigarette and frequency smoke per day, P=0.001), smoking cues (such as feeling sad and lonely, P=0.017 & 0.013); waking up in the morning and while driving, (P=0.01& 0.018); smoking rewards (feeling accepted, P=0.026); smoking environment at workplace (smoking in the toilet, P=0.05) and at home (not smoking neither inside nor outside the house, P=0.013). Conclusion: Nicotine dependence is associated with smoking practices, smoking cues, smoking rewards and smoking environment. Understanding the associations could help in establishing better smoking cessation programs. The smoking cessation program should focus not only on individual smokers but also their smoking environments at the workplace (such as making sure sufficient no smoking signage are present to remind smokers) and as well as at home (such as empowering family members to encourage smokers not to smoke at home)

Molybdenum-99 (99Mo) Adsorption Profile of Zirconia-Based Materials for 99Mo/99mTc Generator Application

Technetium-99m (99mTc) plays a major role in diagnostic nuclear medicine and has not yet been replaced with any other radionuclides. It is available through the 99Mo/99mTc generator. The use of low-specific-activity 99Mo for 99Mo/99mTc generator application requires high adsorptive capacity sorbents. This study focused on the determination of 99Mo adsorption capacity of several zirconia materials, namely monoclinic nanozirconia, orthorhombic nanozirconia, sulfated zirconia,   and phosphated zirconia. These materials were synthesized by using the sol-gel method and characterized using FT-IR spectroscopy, X-ray diffraction (XRD), and scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM-EDS). The determination of 99Mo adsorption capacity of these materials was carried out by soaking the materials in a Na299MoO4 solution with pH of 3 and 7, at temperatures ranging from room temperature to 90 °C, for 1 and 3 hours. The results indicated that monoclinic nanozirconia has a 99Mo adsorption capacity of 76.9 mg Mo/g, whereas orthorhombic nanozirconia, sulfated zirconia, and phosphated zirconia have 99Mo adsorption capacities of 150.1 mg Mo/g, 15.58 mg Mo/g, and 12.74 mg Mo/g, respectively. It appears that orthorhombic nanozirconia has the highest 99Mo adsorption capacity among the synthesized materials and can be applied as a candidate material for the 99Mo/99mTc generator

Indoor environment propagation review

A survey of indoor propagation characteristics is presented, including different models for path loss, shadowing and fast fading mechanisms, different channel parameters including signal strength, power delay, coherence bandwidth, Doppler spread and angle of arrival. The concepts of MIMO channels are also covered. The study also explores many types of deterministic channel modelling, such as Finite Difference Time Domain, Finite Integration Method, Ray tracing and the Dominant path model. Electromagnetic properties of building materials, including frequency dependence, are also investigated and several models for propagation through buildings are reviewed

Efficient Verifiable Computation of XOR for Biometric Authentication

This work addresses the security and privacy issues in remotebiometric authentication by proposing an efficient mechanism to verifythe correctness of the outsourced computation in such protocols.In particular, we propose an efficient verifiable computation of XORingencrypted messages using an XOR linear message authenticationcode (MAC) and we employ the proposed scheme to build a biometricauthentication protocol. The proposed authentication protocol is bothsecure and privacy-preserving against malicious (as opposed to honest-but-curious) adversaries. Specifically, the use of the verifiable computation scheme together with an homomorphic encryption protects the privacy of biometric templates against malicious adversaries. Furthermore, in order to achieve unlinkability of authentication attempts, while keeping a low communication overhead, we show how to apply Oblivious RAM and biohashing to our protocol. We also provide a proof of security for the proposed solution. Our simulation results show that the proposed authentication protocol is efficient

On the application of proper orthogonal decomposition (POD) for in-cylinder flow analysis

Proper orthogonal decomposition (POD) is a coherent structure identification technique based on either measured or computed data sets. Recently, POD has been adopted for the analysis of the in-cylinder flows inside internal combustion engines. In this study, stereoscopic particle image velocimetry (Stereo-PIV) measurements were carried out at the central vertical tumble plane inside an engine cylinder to acquire the velocity vector fields for the in-cylinder flow under different experimental conditions. Afterwards, the POD analysis were performed firstly on synthetic velocity vector fields with known characteristics in order to extract some fundamental properties of the POD technique. These data were used to reveal how the physical properties of coherent structures were captured and distributed among the POD modes, in addition to illustrate the difference between subtracting and non-subtracting the ensemble average prior to conducting POD on datasets. Moreover, two case studies for the in-cylinder flow at different valve lifts and different pressure differences across the air intake valves were presented and discussed as the effect of both valve lifts and pressure difference have not been investigated before using phase-invariant POD analysis. The results demonstrated that for repeatable flow pattern, only the first mode was sufficient to reconstruct the physical properties of the flow. Furthermore, POD analysis confirmed the negligible effect of pressure difference and subsequently the effect of engine speed on flow structures

Postnatal trajectories of maternal depressive symptoms: Postpartum antecedents and differences in toddler adjustment

Infants are uniquely vulnerable to maternal depression’s noxious effects, but few longitudinal studies have tried to identify discrete postnatal trajectories of maternal depressive symptoms (MDS) beginning in infancy. This study extends evidence of heterogeneous change in postnatal MDS by examining their cross‐contextual antecedents in infancy and their consequences for children’s early behavior problems and language skills in late toddlerhood. A community sample of mother–child dyads (N = 235, 72% Caucasian) was assessed when children were 7, 15, and 33 months old. Mothers reported their socioeconomic status (SES), social support, marital relationship quality, family dysfunction, parenting stress, and infants’ functional regulatory problems at 7 months postpartum, and children’s internalizing and externalizing symptoms at 33 months. Children completed a receptive vocabulary assessment at 33 months in the lab. Latent class growth analysis identified three postnatal MDS trajectory classes that fit the data best: low‐decreasing, moderate, and increasing. Psychosocial measures at seven months postpartum primarily predicted membership to these postnatal trajectory classes, which subsequently differed in children’s internalizing, externalizing, and receptive vocabulary in late toddlerhood, controlling for family SES and functional regulatory problems in infancy. We discuss salient antecedents and consequences of postnatal depression for mothers and their offspring.Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/154920/1/imhj21843_am.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/154920/2/imhj21843.pd