Optimizing an array of antennas for cellular coverage from a high altitude platform

In a wireless communications network served by a high altitude platform (HAP) the cochannel interference is a function of the antenna beamwidth, angular separation and. sidelobe level. At the millimeter wave frequencies proposed for HAPs, an array of aperture type antennas on the platform is a practicable solution for serving the cells. We present a method for predicting cochannel interference based on curve-fit approximations for radiation patterns of elliptic beams which illuminate cell edges with optimum power, and a means of estimating optimum beamwidths for each cell of a regular hexagonal layout. The method is then applied to a 121 cell architecture. Where sidelobes are modeled As a flat floor at 40-dB below peak directivity, a cell cluster size of four yields carrier-to-interference ratios (CIRs), which vary from 15 dB at cell edges to 27 dB at cell centers. On adopting a cluster size of seven, these figures increase, respectively, to 19 and 30 dB. On reducing the sidelobe level, the. improvement in CIR can be quantified. The method also readily allows for regions of overlapping channel coverage to be shown

LArPix: Demonstration of low-power 3D pixelated charge readout for liquid argon time projection chambers

We report the demonstration of a low-power pixelated readout system designed for three-dimensional ionization charge detection and digital readout of liquid argon time projection chambers (LArTPCs). Unambiguous 3D charge readout was achieved using a custom-designed system-on-a-chip ASIC (LArPix) to uniquely instrument each pad in a pixelated array of charge-collection pads. The LArPix ASIC, manufactured in 180 nm bulk CMOS, provides 32 channels of charge-sensitive amplification with self-triggered digitization and multiplexed readout at temperatures from 80 K to 300 K. Using an 832-channel LArPix-based readout system with 3 mm spacing between pads, we demonstrated low-noise ($<$500 e$^-$ RMS equivalent noise charge) and very low-power ($<$100 $\mu$W/channel) ionization signal detection and readout. The readout was used to successfully measure the three-dimensional ionization distributions of cosmic rays passing through a LArTPC, free from the ambiguities of existing projective techniques. The system design relies on standard printed circuit board manufacturing techniques, enabling scalable and low-cost production of large-area readout systems using common commercial facilities. This demonstration overcomes a critical technical obstacle for operation of LArTPCs in high-occupancy environments, such as the near detector site of the Deep Underground Neutrino Experiment (DUNE).Comment: 19 pages, 10 figures, 1 ancillary animation. V3 includes minor revisions based on referee comment

Hubungan Antara Beban Kerja Dengan Stres Kerja Pada Perawat Pelaksana Di Ruang Isolasi Covid-19 Rumah Sakit Umum Daerah Kota Kotamobagu

Dampak dari wabah Coronavirus Disease of 2019 (COVID-19) menimbulkan pengaruh yang serius pada tenaga kesehatan. Dampak yang paling berpengaruh yaitu kesehatan, dampak kesehatan yang ditimbulkan bukan hanya kesehatan secara fisik namun dapat memiliki efek serius pada kesehatan mental dan merujuk untuk munculnya keluhan stres kerja khususnya petugas kesehatan atau perawat. Kasus COVID-19 tidak bisa diprediksi, maka perlu adanya perkembangan ilmu kesehatan dalam penanganan COVID-19 khususnya pada perawat. Penelitian ini bertujuan untuk mengetahui Hubungan antara Beban Kerja dengan Stres Kerja pada Perawat Pelaksana di Ruang Isolasi COVID-19 Rumah Sakit Umum Daerah Kota Kotamobagu. Jenis penelitian kuantitatif dengan menggunakan metode analitik observasional dengan pendekatan studi potong lintang Cross-Sectional, dilaksanakan di RSUD Kota Kotamobagu pada bulan Agustus - Oktober tahun 2021. Sampel sebanyak 62 responden dengan menggunakan teknik pengambilan sampel yaitu total sampling. Instrumen dalam penelitian ini menggunakan kuesioner. Penelitian ini di ikuti oleh 62 responden dimana 53% berumur  28 tahun, mayoritas perempuan 71,6% dengan tingkat pendidikan D3 69,4% dan masa kerja  5 tahun 74%. Pada penelitian ini ditemukan 91,9% melaporkan mengalami stres ringan dan mempunyai beban kerja ringan 75,8%. Hasil penelitian ini menggunakan uji korelasi Somers’d. Hasil yang didapatkan dalam penelitian ini yaitu berdasarkan uji statistik diperoleh nilai korelasi koefisien sebesar 0,157 yang menunjukkan korelasi yang sangat lemah dengan nilai p = 0.153>0,05 artinya tidak ada hubungan antara beban kerja dengan stres kerja pada perawat pelaksana di ruang isolasi COVID-19 RSUD Kota Kotamobagu. Kesimpulan dalam penelitian ini bahwa beban kerja bukan satu-satunya faktor penting yang mempengaruhi stres kerja pada perawat pelaksana diruang isolasi COVID-19 RSUD Kota Kotamobagu. Saran untuk instansi rumah sakit agar bisa mengevaluasi faktor-faktor lain yang bisa menyebabkan stres pada perawat. Kata kunci: stres kerja, beban kerja, perawat pelaksana ruang isolasi COVID-19 ABSTRACTThe impact of the Coronavirus Disease of 2019 (COVID-19) outbreak has a serious impact on health workers. The most influential impact is health, the health impact caused not only physical health but can have a serious effect on mental health and refer to the emergence of complaints of work stress, especially health workers or nurses. COVID-19 cases cannot be predicted, so there needs to be the development of health science in handling COVID-19, especially in nurses. This study aims to find out the relationship between workload and work stress in the managing nurse in the isolation room of COVID-19 kotamobagu regional general hospital. This type of quantitative research using observational analytical methods with cross-sectional latitude cut study approach, was carried out at Kotamobagu Hospital in August - October 2021. A sample of 62 respondents using sampling techniques, namely total sampling. The instruments in the study used questionnaires. The study was followed by 62 respondents where 53% aged ≤ 28 years, the majority of women 71.6% with a D3 education level of 69.4% and a working period of ≤ 5 years 74%. In this study, 91.9% reported experiencing mild stress and having a light workload of 75.8%. The results of this study used the Somers'd correlation test. The results obtained in this study, based on statistical tests obtained a coefficient correlation value of 0.157 which showed a very weak correlation with a value of p = 0.153>0.05 means that there is no relationship between workload and work stress in the implementing nurse in the isolation room of COVID-19 Kotamobagu Hospital. The conclusion in this study that workload is not the only important factor that affects work stress in the implementing nurses in the isolation room of COVID-19 Kota Kotamobagu Hospital. Advice for hospital agencies to be able to evaluate other factors that can cause stress in nurses. Keywords: work stress, workload, COVID-19 isolation room managing nurse  

DEVELOPMENT OF NIPA (Nypa fruticans) SAP CLOSED COLLECTION VESSEL

The ultimate goal of the present study was to develop a secure, safe, and hygienic nipa sap collection system for bioethanol production, with the aim of preserving its physico-chemical properties such as physical appearance, pH and sugar brix by reducing the rate of fermentation while attached to the peduncle. The developed collection system was evaluated in terms of the physical and chemical properties of nipa sap collected and ethanol yield in comparison to the traditional and existing collection system used by the nipa community which utilizes bamboo shingle as their collector. Physical appearance of the sap collected using the designed collection system had no foreign materials after harvesting while the traditional collection system had shown traces of insect infestation. The sap that was produced for both of the designed and traditional collection system was milky-white and yellowish-white in color respectively. There was a significant difference in terms of pH concentration of the sap collected using the designed collection system compared to the sap collected using the traditional system overtime. Sugar brix of nipa sap collected using designed collection system is significantly higher than the sap collected using traditional system. A total ethanol yield of 32.25% and 75.54% was obtained for the designed and traditional collection system respectively. Cost Analysis revealed that the designed collection system was found to be cheaper (PhP 11.93) than the traditional collection system (PhP. 20.00). The developed closed collection system can preserved the chemical properties of the nipa sap and could prevent acceleration of fermentation and the deterioration of its potential to yield more ethanol

Improved Standpipe Entrance for Stable High-Flux Flow

Cold model tests were used to show the causes of instabilities in the operation of the standpipe entrance (“sore thumb”) in industrial scale fluid cokers. New geometries were tested which might provide higher flows and prevent operating problems such as flow reversals and flooding, while also minimizing the adverse effects of fouling. The tests were conducted using FCC particles in a geometrically and dynamically scaled half-column of approximately 1/9th scale which had previously been used to show the effects of baffles on fluid coker strippers. The addition of sloping surfaces to increase the surface area for ingress of particles was helpful to an extent, but excessive overhang resulted in bubbles being drawn in. A perforated top surface was found to be instrumental in the degassing of the solids, whereas porous side area was essential for solids entry. Aeration of the standpipe reduced stick-slip flow, but excessive aeration made degassing more difficult and therefore promoted flow reversal. Loss of area at the top, and to a lesser extent, at the sides was found to be detrimental to the performance of the standpipe entrance. Several new geometries were tested, leading to one that provided better flow stability, improved flow control, excellent pressure build-up in the standpipe, more tolerance to fouling, and enhanced circulation capacity

On the making and taking of professionalism in the further education workplace

This paper examines the changing nature of professional practice in English further education. At a time when neo-liberal reform has significantly impacted on this under-researched and over-market-tested sector, little is known about who its practitioners are and how they construct meaning in their work. Sociological interest in the field has tended to focus on further education practitioners as either the subjects of market and managerial reform or as creative agents operating within the contradictions of audit and inspection cultures. In challenging such dualism, which is reflective of wider sociological thinking, the paper examines the ways in which agency and structure combine to produce a more transformative conception of the further education professional. The approach contrasts with a prevailing policy discourse that seeks to re-professionalise and modernise further education practice without interrogating either the terms of its professionalism or the neo-liberal practices in which it resides

Implications of Electronics Constraints for Solid-State Quantum Error Correction and Quantum Circuit Failure Probability

In this paper we present the impact of classical electronics constraints on a solid-state quantum dot logical qubit architecture. Constraints due to routing density, bandwidth allocation, signal timing, and thermally aware placement of classical supporting electronics significantly affect the quantum error correction circuit's error rate. We analyze one level of a quantum error correction circuit using nine data qubits in a Bacon-Shor code configured as a quantum memory. A hypothetical silicon double quantum dot quantum bit (qubit) is used as the fundamental element. A pessimistic estimate of the error probability of the quantum circuit is calculated using the total number of gates and idle time using a provably optimal schedule for the circuit operations obtained with an integer program methodology. The micro-architecture analysis provides insight about the different ways the electronics impact the circuit performance (e.g., extra idle time in the schedule), which can significantly limit the ultimate performance of any quantum circuit and therefore is a critical foundation for any future larger scale architecture analysis.Comment: 10 pages, 7 figures, 3 table

Late Miocene to early Pliocene biofacies of Wanganui and Taranaki Basins, New Zealand: Applications to paleoenvironmental and sequence stratigraphic analysis

The Matemateaonga Formation is late Miocene to early Pliocene (upper Tongaporutuan to lower Opoitian New Zealand Stages) in age. The formation comprises chiefly shellbeds, siliciclastic sandstone, and siltstone units and to a lesser extent non-marine and shallow marine conglomerate and rare paralic facies. The Matemateaonga Formation accumulated chiefly in shelf paleoenvironments during basement onlap and progradation of a late Miocene to early Pliocene continental margin wedge in the Wanganui and Taranaki Basins. The formation is strongly cyclothemic, being characterised by recurrent vertically stacked facies successions, bounded by sequence boundaries. These facies accumulated in a range of shoreface to mid-outer shelf paleoenvironments during conditions of successively oscillating sea level. This sequential repetition of facies and the biofacies they enclose are the result of sixth-order glacio-eustatic cyclicity. Macrofaunal associations have been identified from statistical analysis of macrofossil occurrences collected from multiple sequences. Each association is restricted to particular lithofacies and stratal positions and shows a consistent order and/or position within the sequences. This pattern of temporal paleoecologic change appears to be the result of lateral, facies-related shifting of broad biofacies belts, or habitat-tracking, in response to fluctuations of relative sea level, sediment flux, and other associated paleoenvironmental variables. The associations also show strong similarity in terms of their generic composition to biofacies identified in younger sedimentary strata and the modern marine benthic environment in New Zealand

Heavy Metal Contamination in Water and Fishery Resources in Manila Bay Aquaculture Farms

Heavy metals (HM) are high-atomic weight elements hazardous at very low concentrations. Despite the health risk HM contamination brings, studies conducted were only confined to the offshore and marine portions of the bay. Hence, this study was conducted to establish baseline information and compare the spatial and seasonal distribution of heavy metal contamination in water and fishery resources in aquaculture farms and coastal areas in Manila Bay. Water and major aquaculture commodities were collected in November 2014, February 2015 and April 2015 and were analyzed for lead (Pb), cadmium (Cd), and mercury (Hg) using the following methods: (1) Graphite Furnace Atomizer-Atomic Absorption Spectrophotometry (GFA-AAS) for Pb and Cd and (2) Mercury Vaporizing Unit-AAS (MVU-AAS) for Hg. Cd (Bataan, Cavite, Bulacan, and Pampanga) and Hg (Cavite and Pampanga) in water were found significantly higher during the dry season (p < 0.05). In contrast, Pb in water was relatively higher during the wet season but levels were not significantly different with those in the dry. Several sites in Bataan, Bulacan, and Cavite, exceeded DENR regulatory limits for Pb and Hg in water by 1.35 to 1.8%. As for the fishery commodities, 2/12 milkfish samples and 1/9 exceeded regulatory limit for Pb in finfish (0.3 mg/kg) by 1.03 to 3.57% while 1/12 milkfish samples and 1/13 oyster samples exceeded the limit for Hg in bivalves (0.5 mg/kg) by 0.45 to 0.75%