Gender Matters! Analyzing Global Cultural Gender Preferences for Venues Using Social Sensing

Gender differences is a phenomenon around the world actively researched by social scientists. Traditionally, the data used to support such studies is manually obtained, often through surveys with volunteers. However, due to their inherent high costs because of manual steps, such traditional methods do not quickly scale to large-size studies. We here investigate a particular aspect of gender differences: preferences for venues. To that end we explore the use of check-in data collected from Foursquare to estimate cultural gender preferences for venues in the physical world. For that, we first demonstrate that by analyzing the check-in data in various regions of the world we can find significant differences in preferences for specific venues between gender groups. Some of these significant differences reflect well-known cultural patterns. Moreover, we also gathered evidence that our methodology offers useful information about gender preference for venues in a given region in the real world. This suggests that gender and venue preferences observed may not be independent. Our results suggests that our proposed methodology could be a promising tool to support studies on gender preferences for venues at different spatial granularities around the world, being faster and cheaper than traditional methods, besides quickly capturing changes in the real world

Late Frasnian mass extinction: Conodont event stratigraphy, global changes, and possible causes

Several abrupt changes in conodont biofacies are documented to occur synchronously at six primary control sections across the Frasnian-Famennian boundary in Euramerica. These changes occurred within a time-span of only about 100,000 years near the end of the latest Frasnian linguiformis Zone, which is formally named to replace the Uppermost gigas Zone. The conodont-biofacies changes are interpreted to reflect a eustatic rise followed by an abrupt eustatic fall immediately preceding the late Frasnian mass extinction. Two new conodont species are named and described. Ancyrognathus ubiquitus n.sp. is recorded only just below and above the level of late Frasnian extinction and hence is a global marker for that event. Palmatolepispraetriangularis n.sp. is the long-sought Frasnian ancestor of the formerly cryptogenic species, Pa. triangularis, indicator of the earliest Famennian Lower triangularis Zone. The actual extinction event occurred entirely within the Frasnian and is interpreted to have been of brief duration-from as long as 20,000 years to as short as several days. The eustatic rise-and-fall couplet associated with the late Frasnian mass extinction is similar to eustatic couplets associated with the demise of most Frasnian (F2h) reefs worldwide about 1 m.y. earlier and with a latest Famennian mass extinction about 9.5 m.y. later. All these events may be directly or indirectly attributable to extraterrestrial triggering mechanisms. An impact of a small bolide or a near miss of a larger bolide may have caused the earlier demise of Frasnian reefs. An impact of possibly the same larger bolide in the Southern Hemisphere would explain the late Frasnian mass extinction. Global regression during the Famennian probably resulted from Southern-Hemisphere glaciation triggered by the latest Frasnian impact. Glaciation probably was the indirect cause of the latest Famennian mass extinction

Pengaruh Model Pembelajaran Ctl (Contextual Teaching and Learning) Terhadap Motivasi Dan Hasil Belajar Siswa SMKN 1 Sidoarjo

Penelitian ini bertujuan untuk meningkatkan hasil belajar peserta didik dengan menerapkan modelpembelajaran kontekstual (CTL) pada mata pelajaran muatan lokal (Autocad). Melalui penerapan modelpembelajaran kontekstual, sangat memungkinkan terciptanya suasana pembelajaran yang kondusif.Dengan adanay suasana belajar yang baru ini, kualitas pembelajaran dapat meningkat dan motivasibelajar peserta didik menjadi lebih baik.Peserta didik yang dijadikan objek dalam penelitian ini adalah peserta didik kelas X TPm 1 dan 2, yangterdiri dari 72 peserta didik. Jenis penelitian ini adalah penelitian komparasi menggunakan analisis regresisederhana, peneliti menggunakan satu kelas sebagai kelas kontrol dan satu kelas lainnya sebagai kelaseksperimen. Dengan menggunakan metode CTL diharapkan bahwa ketuntasan belajar peserta didikmengalami peningkatan. Dalam penelitian ini, ketuntasan belajar peserta didik mencapai 83%.Untuk mengetahui apakah ada perbedaan dalam penggunaan model pembelajaran kontekstual denganmodel pembelajaran konvensional, peneliti menggunakan uji homogenitas, normalitas dan uji T. Selainitu peneliti juga menggunakan uji regresi sederhana untuk mengetahui seberapa besar modelpembelajaran kontekstual terhadap hasil belajar peserta didik. Setelah dilakukan uji regresi sederhana,dapat dikemukakan bahwa model pembelajara CTL mempengaruhi 12% hasil peserta didik siswa kelas XTPm SMK Negeri 1 Sidoarjo. Sedangkan sisanya dipengaruhi oleh faktor-faktor lain seperti lingkungan,media pembelajaran, dukungan orang tua, sekolah dan lain sebagainya

Methods for sampling geographically mobile female traders in an East African market setting.

BACKGROUND:The role of migration in the spread of HIV in sub-Saharan Africa is well-documented. Yet migration and HIV research have often focused on HIV risks to male migrants and their partners, or migrants overall, often failing to measure the risks to women via their direct involvement in migration. Inconsistent measures of mobility, gender biases in those measures, and limited data sources for sex-specific population-based estimates of mobility have contributed to a paucity of research on the HIV prevention and care needs of migrant and highly mobile women. This study addresses an urgent need for novel methods for developing probability-based, systematic samples of highly mobile women, focusing on a population of female traders operating out of one of the largest open air markets in East Africa. Our method involves three stages: 1.) identification and mapping of all market stall locations using Global Positioning System (GPS) coordinates; 2.) using female market vendor stall GPS coordinates to build the sampling frame using replicates; and 3.) using maps and GPS data for recruitment of study participants. RESULTS:The location of 6,390 vendor stalls were mapped using GPS. Of these, 4,064 stalls occupied by women (63.6%) were used to draw four replicates of 128 stalls each, and a fifth replicate of 15 pre-selected random alternates for a total of 527 stalls assigned to one of five replicates. Staff visited 323 stalls from the first three replicates and from these successfully recruited 306 female vendors into the study for a participation rate of 94.7%. Mobilization strategies and involving traders association representatives in participant recruitment were critical to the study's success. CONCLUSION:The study's high participation rate suggests that this geospatial sampling method holds promise for development of probability-based samples in other settings that serve as transport hubs for highly mobile populations

Sentinel surveillance of HIV-1 transmitted drug resistance, acute infection and recent infection.

BackgroundHIV-1 acute infection, recent infection and transmitted drug resistance screening was integrated into voluntary HIV counseling and testing (VCT) services to enhance the existing surveillance program in San Francisco. This study describes newly-diagnosed HIV cases and characterizes correlates associated with infection.Methodology/principal findingsA consecutive sample of persons presenting for HIV VCT at the municipal sexually transmitted infections (STI) clinic from 2004 to 2006 (N = 9,868) were evaluated by standard enzyme-linked immunoassays (EIA). HIV antibody-positive specimens were characterized as recent infections using a less-sensitive EIA. HIV-RNA pooled testing was performed on HIV antibody-negative specimens to identify acute infections. HIV antibody-positive and acute infection specimens were evaluated for drug resistance by sequence analysis. Multivariable logistic regression was performed to evaluate associations. The 380 newly-diagnosed HIV cases included 29 acute infections, 128 recent infections, and 47 drug-resistant cases, with no significant increases or decreases in prevalence over the three years studied. HIV-1 transmitted drug resistance prevalence was 11.0% in 2004, 13.4% in 2005 and 14.9% in 2006 (p = 0.36). Resistance to non-nucleoside reverse transcriptase inhibitors (NNRTI) was the most common pattern detected, present in 28 cases of resistance (59.6%). Among MSM, recent infection was associated with amphetamine use (AOR = 2.67; p<0.001), unprotected anal intercourse (AOR = 2.27; p<0.001), sex with a known HIV-infected partner (AOR = 1.64; p = 0.02), and history of gonorrhea (AOR = 1.62; p = 0.03).ConclusionsNew HIV diagnoses, recent infections, acute infections and transmitted drug resistance prevalence remained stable between 2004 and 2006. Resistance to NNRTI comprised more than half of the drug-resistant cases, a worrisome finding given its role as the backbone of first-line antiretroviral therapy in San Francisco as well as worldwide. The integration of HIV-1 drug resistance, recent infection, and acute infection testing should be considered for existing HIV/STI surveillance and prevention activities, particularly in an era of enhanced efforts for early diagnosis and treatment

Light and dark adaptation mechanisms in the compound eyes of Myrmecia ants that occupy discrete temporal niches

Ants of the Australian genus Myrmecia partition their foraging niche temporally, allowing them to be sympatric with overlapping foraging requirements. We used histological techniques to study the light and dark adaptation mechanisms in the compound eyes of diurnal (Myrmecia croslandi), crepuscular (M. tarsata, M. nigriceps) and nocturnal ants (M. pyriformis). We found that, except in the day-active species, all ants have a variable primary pigment cell pupil that constricts the crystalline cone in bright light to control for light flux. We show for the nocturnal M. pyriformis that the constriction of the crystalline cone by the primary pigment cells is light dependent whereas the opening of the aperture is regulated by an endogenous rhythm. In addition, in the light-adapted eyes of all species, the retinular cell pigment granules radially migrate towards the rhabdom, a process that in both the day-active M. croslandi and the night-active M. pyriformis is driven by ambient light intensity. Visual system properties thus do not restrict crepuscular and night-active ants to their temporal foraging niche, while day-active ants require high light intensities to operate. We discuss the ecological significance of these adaptation mechanisms and their role in temporal niche partitioning

Analisis Koordinasi dan Setting Over Current Relay (Ocr) pada Pemakaian Daya Sendiri Pltu SMS Energy Menggunakan Software Etap 12.6.0

Penelitian ini bertujuan untuk mengetahui besaran settingan OCR Motor Pump, Grading Time OCR Motor Pump, koordinasi OCR Motor Pump dan OCR auxiliary pada PLTU SMS Energi di kawasan industri Bolok.  Penelitian diawali dengan mengumpulkan data kelistrikan PLTU SMS Energy berupa data sekunder. Data-data tersebut digunakan  untuk membuat single line diagram, simulasi dan analisis menggunakan  ETAP 12.6.0. Hasil Penelitian mendapatkan Settingan OCR dengan parameter nilai arus hubung singkat sebagai berikut. Setting Rele Bus 1 FCP dengan Ip = 3 A dan TMS = 0,1 s,  Setting Rele Bus Auxiliary I dengan Ip = 2 A dan TMS = 0,21 s, Setting Rele Bus OutGoing 1 dengan Ip = 0,6666 A dan TMS = 0,30 s dan Setting Rele Bus G1 dengan Ip = 1 A dan TMS = 0,45 s. TMS OCR pada motor Pump disetting lebih cepat karena letak OCR paling hilir dengan ganguan hubung singkat lebih kecil. Dari koordinasi kurva didapatkan Grading Time yang sudah sesuai dengan standar IEEE 242-yakni 0.2 – 0.4 detik.  Kata Kunci: Over Current Relay, Koordinasi OCR, Grading time, Settingan OCR, ETAP 12.6.

Dynamics of charge-displacement channeling in intense laser-plasma interactions

The dynamics of transient electric fields generated by the interaction of high intensity laser pulses with underdense plasmas has been studied experimentally with the proton projection imaging technique. The formation of a charged channel, the propagation of its front edge and the late electric field evolution have been characterised with high temporal and spatial resolution. Particle-in-cell simulations and an electrostatic, ponderomotive model reproduce the experimental features and trace them back to the ponderomotive expulsion of electrons and the subsequent ion acceleration.Comment: 5 figures, accepted for publication in New Journal of Physic