Black Hole - Moving Mirror I: An Exact Correspondence

An exact correspondence is shown between a new moving mirror trajectory in (1+1)D and a spacetime in (1+1)D in which a black hole forms from the collapse of a null shell. It is shown that the Bogolubov coe cients between the \in" and \out" states are identical and the exact Bogolubov coe cients are displayed. Generaliza- tion to the (3+1)D black hole case is discusse

Generating mass and topological terms to the antisymmetric tensor matter field by Higgs mechanism

The interaction between the complex antisymmetric tensor matter field and a scalar field is constructed. We analyze the Higgs mechanism and show the generation of mass and topological terms by spontaneous symmetry breaking.Comment: Accepted for publication in Phys. Lett.

HUBUNGAN ANTARA SHIFT KERJA DENGAN KELELAHAN KERJA PADA KARYAWAN PT. MATAHARI DEPARTMENT STORE TBK, MANADO TOWN SQUARE, KOTA MANADO

Kelelahan kerja adalah fenomena kompleks pada populasi pekerja yang disebabkan oleh berbagai faktor, seperti lama waktu kerja, kapasitas kerja, maupun lingkungan fisik tempat kerja. Penelitian ini bertujuan untuk mengetahui hubungan antara shift kerja dengan kelelahan kerja pada karyawan PT. Matahari Department Store TBK, Manado Town Square Kota Manado. Penelitian ini merupakan penelitian bersifat survey deskriptif dengan pendekatan Cross Sectional. Sampel penelitian adalah 80 orang karyawan PT. Matahari Departmen Store TBK, Manado Town Square kota manado, pengambilan jumlah sampel menggunakan Rumus Slovin. Pengumpulan data dilakukan dengan wawancara untuk mengetahui karakteristik responden dan pengisian kuesioner shift kerja serta kelelahan kerja. Analisis data dilakukan dengan Chi Square Test dan menggunakan bantuan SPSS. Hasil penelitian menunjukkan bahwa terdapat hubungan yang signifikan antara shift kerja dengan kelelahan kerja pada karyawan PT. Matahari Department Store TBK, Manado Town Square Kota Manado, berdasarkan hasil uji statistik nilai probabilitas 8,000 Pvalue = 0,001. Saran bagi pihak perusahaan agar melakukan evaluasi terus menerus mengenai mekanisme pengaturan shift kerja yang disesuaikan dengan usia, jenis kelamin serta beban kerja dari karyawan agar dapat meminimalkan kelelahan kerja yang timbul, juga menciptakan lingkungan dan suasana kerja yang baik serta nyaman agar dapat menjaga motivasi kerja dari karyawan. Bagi karyawan dapat memperhatikan kondisi tubuh, asupan gizi serta istirahat yang cukup sebelum melakukan pekerjaan.Kata Kunci: Shift Kerja, Kelelahan Kerja ABSTRACT Work fatigue is a complex phenomenon in the working population caused by various factors, such as length of working time, work capacity, and workplace physical environment. This study aims to determine the relationship between work shifts with work fatigue at employees of PT. Matahari Department Store TBK, Manado Town Square Manado City. This research is a descriptive survey with Cross Sectional approach. The sample of research is 80 employees of PT. Matahari Department Store TBK, Manado Town Square city manado, taking samples using Slovin Formulas. Data collection was done by interview to know the characteristics of respondents and filling the work shift questionnaire and work fatigue. Data analysis was done with Chi Square Test and using SPSS. The results showed that there is a significant relationship between work shift with work fatigue on the employees of PT. Matahari Department Store TBK, Manado Town Square Manado City, based on the statistical test probability value 8,000 Pvalue = 0.001. Suggestion for company to do continuous evaluation about work shift arrangement mechanism adjusted to age, sex and work load from employees in order to minimize work fatigue arising, also create environment and working atmosphere good and comfortable in order to keep motivation of work from employees. For employees can pay attention to the condition of the body, nutritional intake and adequate rest before doing the job.Keyword: Work Shift, Work Fatique

Falls in Older People: Comparing Older and Younger Fallers in a Developing Country

Purpose While falls are common in older people, causing significant mortality and morbidity, this phenomenon has not been extensively studied in the Caribbean. This study aimed to compare falls in older and younger people in this setting. Methods We conducted a prospective observational study of older trauma patients in Trinidad, comparing older and younger patients sustaining falls. Results 1432 adult trauma patients were included (1141 aged 18 - 64 years and 291 aged 65 years and older). Older fallers were more likely to be female (66.7% vs 47.2%; p <.001), suffer from multiple pre-existing diseases (24.7% vs 2.4%; p <.001) and take multiple medications (16.1% vs 0.8%; p <.001). They also sustained more severe injuries and presented with higher acuity than younger fallers. Admission rates were higher among older fallers (29.9% vs 13.1%; p <.001). Conclusions In our study, older patients who fell were a distinct group from younger falls victims, with unique demographic, clinical and injury related characteristics. Their increased risk of injury within the home, coupled with their propensity for more severe injuries made them a high risk patient group. More research is needed to better understand this patient group and plan specific preventive interventions

Are older fallers different? Comparing older fallers and non-fallers in a developing country

Objectives: Falls are common in older people, causing significant mortality and morbidity, but little is known about this phenomenon in developing countries. This study aimed to investigate falls in older people in the developing world, comparing fallers with other trauma patients. Methods: We conducted a prospective observational study of older trauma patients in Trinidad over a four-month period, comparing falls victims with other trauma patients, in relation to their demographic, pre-morbid and injury characteristics. Results: A total of 439 older trauma patients (aged 65 years) were included. Fallers were older (median age 75 years (interquartile range 65–89 years) vs. 70 years (interquartile range 65–79 years) in non-fallers). Overall, 65.2% of fallers were female, compared to 43.7% of non-fallers. Fallers were more likely to suffer from multiple pre-existing diseases, with 29.8% having comordibities, compared to 9.7% of non-fallers. Fallers were also more likely to be on multiple medications: 7.1% were on five medications, compared to no non-fallers. Fallers also sustained more severe injuries and presented with higher acuity than non-fallers. Admission and referral rates were higher among fallers compared to other trauma patients (59.9% vs. 30.4%). Conclusions: Older patients who fall are a distinct group from other older trauma patients, with unique demographic, clinical and injury-related characteristics. This information is useful in planning preventive and management strategies for these patients

Resistive Random Access Memories (RRAMs) Based on Metal Nanoparticles

It is demonstrated that planar structures based on silver nanoparticleshosted in a polymer matrix show reliable and reproducible switching properties attractive for non-volatile memory applications. These systems can be programmed between a low conductance (off-state) and high conductance (on-state) with an on/off ratio of 3 orders of magnitude, large retention times and good cycle endurance. The planar structure design offers a series of advantages discussed in this contribution, which make it an ideal tool to elucidate the resistive switching phenomena

New electronic memory device concepts based on metal oxide-polymer nanostructures planer diodes

Nanostructure silver oxide thin films diodes can exhibit resistive switching effects. After an electroforming process the device can be programmed between a low conductance (off-state) and high conductance (on- state) with a voltage pulse and they are already being considered for non-volatile memory applications. However, the origin of programmable resistivity changes in a network of nanostructure silver oxide embedded in polymer is still a matter of debate. This work provides some results on a planer diode which may help to elucidate resistive switching phenomena in nanostructure metal oxide diodes. The XRD pattern after switching appears with different crystalline planes, plus temperature dependent studies reveal that conduction of both on and off states is weak thermal activated. Intriguing the carrier transport is the same for both on and off-states. Difference between states comes from the dramatic changes in the carrier density. The main mechanism of charge transport for on-state is tunneling. The charge transport leads to SCLC in higher voltages pulse for the off state. The mechanism will be explained based on percolation concepts

Quantification of cow milk yield and pre-weaning calf growth response in temperate pasture-based beef suckler systems: A meta-analysis

peer-reviewedThe objectives of this study were to quantitatively summarize factors associated with cow milk yield (MY) and calf growth response in pasture-based beef cow-calf suckler systems and to discern how cow genotype and parity influenced these responses. A dataset of 344 treatment mean observations was compiled from 69 studies that reported data on cow MY, and calf pre-weaning average daily live weight gain (ADG) and/or weaning weight (WW). Data were analysed using linear mixed effects models with study and region included as random effects. Models were developed for cow MY, calf ADG and WW response and each model was evaluated based on different model fit statistics. The final cow MY model included cow origin (Dairybeef or Beef), cow maturity (early-maturing (EM) or late-maturing (LM) genotypes) and parity. Dairybeef produced 35.4% more milk (8.64 vs. 6.38 kg/day) than Beef cows, and LM produced 20.9% more milk (8.20 vs. 6.78 kg/day) than EM genotypes (P < 0.001). Multiparous cows had a 14.8% higher MY (8.11 vs. 7.06 kg/day) compared to primiparous cows (P < 0.001). Lactation curve persistency was better (P < 0.05) for Beef and EM compared to Dairybeef and LM genotype cows, respectively. The final models of calf ADG and WW included cow origin, cow maturity and parity. Calves from Dairybeef and LM cows were 14 and 20 kg heavier (P < 0.001) at weaning (210-day adjusted) compared to those from Beef and EM genotype cows, respectively. Calves from multiparous cows were 13 kg heavier at weaning than those from primiparous cows (P < 0.001). The response in calf ADG associated with a 1 kg increase in cow daily MY was 47 and 53 g for Dairybeef and Beef cows, respectively (P < 0.001). Corresponding responses for EM and LM cows were 51 and 55 g (P < 0.001). In conclusion, the relationships between cow MY and calf pre-weaning growth, as well as the quantitative impact of cow genotype and parity were determined for pasture-based beef suckler systems; the coefficients generated can be used for improving beef cow-calf management strategies, beef cattle breeding programmes and bio-economic modelling purposes