Text 4 Health: Addressing Consumer Health Information Needs via Text Reference Service

This study seeks to provide empirical evidence about how health-related questions are answered in text reference service in order to further the understanding of how to best use texting as a reference service venue to fulfill people’s health information needs. Two hundred health reference transactions from My Info Quest, the first nation-wide collaborative text reference service, were analyzed identify the types of questions, length of transactions, question-answering behavior, and information sources used in the transactions. Findings indicate that texting-based health reference transactions are usually brief, and cover a wide variety of topics. The most popular questions are those seeking general factual information about human body, medical/health conditions, diseases, or medical concepts/jargons. Great variance is discovered among the question-answering behavior, with only a little more than half of the answers containing citation to information sources. The study will inform the practice of health reference service via texting, and help libraries make evidence-based decisions on establishing service policies and procedures, providing training for librarians, and ultimately implementing the service successfully

Broadband Electrically Small Circularly Polarized Directive Antenna

© 2013 IEEE. A broadband electrically small antenna with directive circularly polarized radiation is presented. It is composed of a compact single-feed crossed dipole driver, which is backed by a near-field resonant parasitic (NFRP) reflector to achieve the directive radiation pattern. The NFRP reflector is designed to generate extra resonances and minimum axial ratio (AR) points in the antenna system. These features are combined with those resulting from the driver to broaden the operational bandwidth. The proposed antenna was fabricated and measured. The antenna prototype, with a low profile (0.066 λo at 1.45 GHz) and an electrically small size (ka = 0.71 at 1.45 GHz), has a measured S11<-10 dB bandwidth of 25.66% (1.362-1.763 GHz) and a 3-dB AR bandwidth of 10.56% (1.390-1.545 GHz). Additionally, the measurements resulted in a broadside gain of 2.31 ± 0.4 dBic and an average radiation efficiency of 80% within the operational bandwidth

Reconfigurable circularly polarized cross-dipole antenna with a near-field resonant parasitic element

© Institution of Engineering and Technology.All Rights Reserved. This paper presents a polarization switchable circularly polarized (CP) antenna that consists of a compact single-feed crossed dipole loaded with a near-field resonant parasitic (NFRP) element. This antenna is placed above a metallic reflector to enhance its gain and broadside radiation pattern. A meander line with an arrowhead-shaped ending was applied to all arms of the crossed dipole and NFRP elements for compactness. By adjusting the end size of the NFRP element, the antenna was capable of switching its polarization from right-hand circular polarization to left-hand circular polarization and vice versa. The reconfigurability is realized by controlling the ON/OFF states of 8 PIN-diodes, which are inserted into the arrowhead endings of the NFRP element. For the RHCP mode, the antenna yields a |S11| 6.0 dBic and a radiation efficiency of > 70% across its operational bandwidth

Applications of circularly polarized crossed dipole antennas

© 2014 IEEE. Circularly polarized crossed dipole antennas are presented in this paper. A compact crossed dipole is realized with the use of a meander line and a barbed end in each dipole arm. A vacant-quarter printed ring is used as a 90° phase delay line to achieve circularly polarized radiation. For multi-band applications, each dipole arm is divided into multi-branches with different lengths to obtain multiple resonances. These radiators can be equipped with different reflectors, such as a finite planar metallic conductor, a cavity-backed metallic conductor, and a finite artificial magnetic conductor to obtain the desired antenna radiation characteristics. These antennas are quite practical for many wireless communication systems, such as satellite communications, global positioning systems, wireless local area networks, and radio-frequency identification devices

Compact Crossed-Dipole Antennas Loaded with Near-Field Resonant Parasitic Elements

© 2016 IEEE. Two compact planar crossed-dipole antennas loaded with near-field resonant parasitic (NFRP) elements are reported. The NFRP and crossed-dipole elements are designed for the desired circularly polarized (CP) radiation. By placing the NFRP element over the driven element at angles of 0° and 45°, respectively, dual-band and broadband CP antennas are realized. All radiating elements of antennas are 35 mm × 35 mm × 0.508 mm (0.187 λ0 × 0.187 λ0 × 0.0027 λ0 at 1.6 GHz) in size. The dual-band CP antenna has a measured S11 <-10-dB bandwidth of 226 MHz (1.473-1.699 GHz) and measured 3-dB axial ratio (AR) bandwidths of 12 MHz (1.530-1.542 GHz) and 35 MHz (1.580-1.615 GHz) with minimum AR CP frequencies of 1.535 GHz (AR = 0.26 dB) and 1.595 GHz (AR = 2.08 dB), respectively. The broadband CP antenna has a measured S11 <-10-dB bandwidth of 218 MHz (1.491-1.709 GHz) and a 3-dB AR bandwidth of 145 MHz (1.490-1.635 GHz). These compact antennas yield bidirectional electromagnetic fields with high radiation efficiency across their operational bandwidths

Patients’ reports about medical doctors’ inquiries on their mental health: Do generational status, ethnicity and mental health/substance use disorders matter?

Immigrants are less likely than others to use mental health (MH) services. Physicians\u27 limited time often precludes inquiry about MH. This study investigated the influence of generational status, ethnicity, and mental/substance use disorders on physicians\u27 inquiries about Asian American (AA) MH. Data from the National Latino and Asian American Study were analyzed (n=1,853). The outcome was past year physician\u27s inquiry regarding MH. Results revealed that AA with U.S.-born parents had significantly greater odds compared to AA born outside the U.S. to report that their doctors inquired about their MH (OR=218, 95% CI: 1.28, 3.73). Past year mental/substance use disorder increased the odds of AA reporting that their doctors inquired about their MH (OR=8.41; 95% CI: 3.28, 21.66). This increase differed by ethnicity, with Chinese less affected than Vietnamese (OR=0.17; 95% CI: 0.05, 0.59). The reasons for these associations warrant further exploration

Prevalence, patterns, and correlates of co-occurring substance use and mental disorders in the U.S.: Variations by race/ethnicity

This study examines racial/ethnic differences in the prevalence, patterns, and correlates of co-occurring substance use and mental disorders (COD) among Whites, Blacks, Latinos, and Asians using data from the Collaborative Psychiatric Epidemiology Studies

Dual-Band Operation of a Circularly Polarized Four-Arm Curl Antenna with Asymmetric Arm Length

This paper presents dual-band operation of a single-feed composite cavity-backed four-arm curl antenna. Dual-band operation is achieved with the presence of the asymmetrical arm structure. A pair of vacant-quarter printed rings is used in the feed structure to produce a good circular polarization (CP) at both bands. The cavity-backed reflector is employed to improve the CP radiation characteristics in terms of the 3-dB axial ratio beamwidth and broadside gain. The proposed antenna is widely applicable in dual-band communication systems that have a small frequency ratio. Examples of such a system are global positioning systems

Disparities in use of mental health and substance abuse services by Asian and Native Hawaiian/Other Pacific Islander women

The purpose of this study was to determine if disparities exist in lifetime utilization of mental health/substance abuse services among Asian, Native Hawaiian/Other Pacific Islander (NHOPI) and white mothers. The study sample was comprised of mothers assessed to be at-risk (n = 491) and not at-risk (n = 218) for child maltreatment in the Hawaii Healthy Start Program study. Multiple logistic regression models were used to test the effects of predisposing, need, and enabling factors on utilization of services. Results revealed that, among mothers with depressive symptoms, compared with whites, Asians and NHOPI were significantly less likely to have received services. There were no significant racial differences in use of mental health/substance use services by other factors. These results suggest that racial disparities exist in utilization of mental health/substance abuse services among mothers with depressive symptoms. Future research is needed to identify barriers and facilitators to accessing needed services for Asian and NHOPI women