Sistem Pengendalian Kadar PH dan Penyiraman Tanaman Hidroponik Model Wick System

Hidroponik merupakan cara bercocok tanam menggunakan media air dengan parameter tertentu. Kadar pH dankuantitas air adalah parameter penting yang perlu diperhatikan, sebab pH yang stabil dan air yang cukup akanmembuat pertumbuhan dan kualitas tanaman baik. Petani di dusun Cisarua, Natar melakukan proses penyiraman dan pengendalian pH air tanaman sawi (pakcoy) hidroponik model wick system (sumbu sebagai media akar)secara manual, menggunakan alat ukur pH A009 dengan rentang nilai pH 6.3 – 6.8. Petani harus mengawasitanaman dengan rutin seperti menambah cairan pH Up saat pH air turun, dan cairan pH Down ketika pH tanamanterlalu tinggi, serta menambah air pada tandon. Teknologi Internet of Things (IoT) dapat membantu sistempengendalian dan penyiraman tanaman hidroponik model wick system, sehingga petani mudah untukmemonitoring pH dan tinggi air dari jarak jauh. Metode Rapid Application Development (RAD) yang memilikifase Requirement Planning, User Design, Construction, dan Cutover digunakan sebagai metode pembuatansistem pengendali kadar pH dan menghasilkan sebuah sistem yang dapat meningkatkan kualitas bobot tanaman10 gram atau 12,5% lebih baik dibandingkan pertumbuhan tanaman yang dikendalikan secara manual.Kata kunci: pH, tinggi air,wick system, RAD, dan IoT.

Sustainable Recovery of Architectural Heritage: The Experience of a Worksite School in San Salvador

This paper presents the experience of both interdisciplinary and sustainable implementation of an educational construction site for the recovery of the architectural heritage in Central America. Rey Prendes House is representative of one hundred and forty-five houses made of wood, stamped steel sheet, and deployé that are located in the historical center of San Salvador. Its origin is linked to historical events, such as the strong migration of foreigners to El Salvador in the late nineteenth and early twentieth century, the presidential decrees that encouraged the reconstruction of the city with anti-seismic materials as a result of the earthquakes of 1873 and 1917. More recently, since 2017, Rey Prendes House has been included in the project funded by the Italian Agency for Development Cooperation. In this paper, the phases of the survey are documented with both materials and degradation analyses, the new design construction with BIM technology for the organization of the educational construction site, the creation of offices and laboratories for restoration and treatments of timber and metal details. Moreover, the study provides a contextual framework with the aim of describing the policies and the projects implemented, highlighting the adopted strategies, the results achieved, and outlining the path followed towards the design solutions for sustainable rehabilitation relating to future use.

Preliminary Benefits of Big Data in the Construction Industry: A Case Study

Big data applications consist of i) data collection using big data sources, ii) storing and processing the data, and iii) analysing data to gain insights for creating organisational benefit. The influx of digital technologies and digitization in the construction process includes big data as one newly emerging digital technology adopted in the construction industry. Big data application is in a nascent stage in construction, and there is a need to understand the tangible benefit(s) that big data can offer the construction industry. This study explores the benefits of big data in the construction industry. Using a qualitative case study design, construction professionals in an Australian Construction firm were interviewed. The research highlights that the benefits of big data include reduction of litigation amongst projects stakeholders, enablement of near to real-time communication, and facilitation of effective subcontractor selection. By implication, on a broader scale, these benefits can improve contract management, procurement, and management of construction projects. This study contributes to an ongoing discourse on big data application, and more generally, digitization in the construction industry.

iSHELL: a 1–5 micron R = 80,000 Immersion Grating Spectrograph for the NASA Infrared Telescope Facility

iSHELL is a 1.06–5.3 μm high spectral resolution spectrograph built for the 3.2 m NASA Infrared Telescope Facility (IRTF) on Maunakea, Hawaii. Dispersion is accomplished with a silicon immersion grating in order to keep the instrument small enough to be mounted at the Cassegrain focus of the telescope. The white pupil spectrograph produces resolving powers of up to about R ≡ λ/δλ = 80,000 (0.″375 slit). Cross-dispersing gratings mounted in a tiltable mechanism allow observers to select different wavelength ranges and, in combination with a slit wheel and Dekker mechanism, slit widths ranging from 0.″375 to 4.″0 and slit lengths ranging from 5″ to 25″. One Teledyne 2048 × 2048 HAWAII-2RG array is used in the spectrograph, and one Raytheon 512 × 512 Aladdin 2 array is used in a 1–5 μm slit viewer for object acquisition, guiding, and scientific imaging. iSHELL has been in productive regular use on IRTF since first light in 2016 September. In this paper we discuss details of the science case, design, construction and astronomical use of iSHELL.

Design, construction and operation of the ProtoDUNE-SP Liquid Argon TPC

The ProtoDUNE-SP detector is a single-phase liquid argon time projection chamber (LArTPC) that was constructed and operated in the CERN North Area at the end of the H4 beamline. This detector is a prototype for the first far detector module of the Deep Underground Neutrino Experiment (DUNE), which will be constructed at the Sandford Underground Research Facility (SURF) in Lead, South Dakota, U.S.A. The ProtoDUNE-SP detector incorporates full-size components as designed for DUNE and has an active volume of 7 × 6 × 7.2 m3. The H4 beam delivers incident particles with well-measured momenta and high-purity particle identification. ProtoDUNE-SP's successful operation between 2018 and 2020 demonstrates the effectiveness of the single-phase far detector design. This paper describes the design, construction, assembly and operation of the detector components.

DESIGN, CONSTRUCTION AND TESTING OF A COLD STORE WITH WATER-COOLED CHILLER

Objective of this research was to design, construction and test of a cold store with chiller unit. Dimensions of the cold store were 5x4x3m. Heat load was calculated and capacity of cooling system was determined. Ambient temperature was set 2oC and relative humidity 90% for cold store testing. Ambient temperature, relative humidity and air velocity were measured for 3 different levels and 12 points for each level in the cold store. Total heat load and capacity of cooling system were calculated 5222 kcal/h. and 6.07 kW respectively. The descriptive statistics were calculated for the ambient temperature; mean, 2.82oC, standard deviation 0.02oC and CV(%) 0.56, and for the relative humidity; mean 88.01%, standard deviation 0.61 (%) and CV(%) 0.70 and for the air velocity mean 0.37m/s, standard deviation 0.22 m/s, CV 33.45 %. Even the air velocity CV was high, the ambient temperature and relative humidity variations were evaluated very good.

The Spine, the New HQ for the Royal College of Physicians, Liverpool, UK

This chapter catalogues the working experiences of the architects AHR and their design team and their clients, the Royal College of Physicians, for the design and construction of The Spine, their new Northern HQ, in Liverpool, UK. This iconic building opened in early 2021 and optimistically reflects the ethos and values of the college, and it is set to become one of the healthiest buildings in the world. It will describe and explain the biophilic and salutogenic design construction processes taken by the design team, from commissioning to completion. The main objective for the college when commissioning AHR architects to design their new building was to significantly expand their facilities and to reflect their standing in the world of medicine. So, the AHR design team endeavored to help them attain their goal of a WELL Platinum and the Building Research Establishments Environmental Assessment Methods (BREEAM) Outstanding certification.