Analisis Kelayakan Investasi Properti Pembangunan Ruko dengan Sistem Bangun Bagi (Studi Kasus Lahan di Jalan Danau Sentarum Kota Pontianak)

Dalam suatu perencanan proyek, studi kelayakan finansial sangat dibutuhkan sebelum pelaksanaannyaan. Hal tersebut sangat berpengaruh pada proyek investasi, karena setiap proyek investasi yang akan dilakukan tidak selalu dalam keadaan yang menguntungkan. Oleh karena itu diperlukan suatu studi kelayakan finansial terhadap proyek investasi pembangunan Ruko dengan sistem bangun bagi di jalan Danau Sentarum kota Pontianak.Analisa Studi kelayakan finansial terhadap proyek tersebut dilakukan dengan 3 (tiga) tahap perhitungan yaitu perhitungan cash out (pengeluaran), perhitungan cash in (pendapatan) dan terakhir adalah perhitungan studi kelayakan atau kriteria seleksi.Perhitungan cash out dilakukan dengan mengumpulkan data-data harga tanah, konstruksi, perizinan, fasilitas tambahan, operasional serta pajak. Perhitungan biaya konstruksi berupa RAB konstruksi yang perhitungannya dilakukan dengan analisa BOW. Analisa BOW untuk mengetahui besarnya biaya yang dikeluarkan untuk pekerjaan sipil. Perhitungan biaya perizinan, fasilitas tambahan, operasional dan pajak untuk mengetahui besarnya biaya-biaya lain yang dikeluarkan sebagai modal investasi diluar modal dasar . Kemudian dilakukan perhitungan cash out maka dilakukan perhitungan cash in dengan mengumpulkan data harga jual ruko disekitar lokasi proyek yang memiliki kemiripan tata letak atau lokasi. Hal tersebut dimaksudkan sebagai acuan dalam penentuan asumsi harga jual ruko yang direncanakan untuk menghitung jumlah pendapatan (cash in).Setelah dilakukan perhitungan cash in, selanjutnya dilakukan analisa kriteria seleksi kelayakan finansial dengan 3 (dua) metode yaitu metode Net Present Value (NPV), Benefit Cost Ratio (BCR) dan metode Internal Rate Of Return (IRR). Kriteria seleksi dilakukan untuk mengetahui kelayakan finansial yang terjadi pada proyek tersebut. Dalam analisa ini dilakukan beberapa simulasi atau altenatif pola bagi. Perhitungan terhadap beberapa alternatif ini dilakukan untuk memperoleh pola bagi yang seimbang atau saling menguntungkan kedua belah pihak yaitu pihak pemilik lahan dan pihak investor

Analisis Konsep Nilai Hasil Pada Proyek Ruko 3 Tingkat Di Jalan Ampera Pontianak Dengan Menggunakan Program Primavera 6.0

Manajemen konstruksi adalah perencanaan, penjadwalan dan pengendalian proyek untuk mencapai tujuan proyek tanpa ada penyimpangan. Proyek konstruksi dapat dikelola dengan baik dan mudah apabila menggunakan Konsep Nilai Hasil (Earned Value Analysis). Konsep Nilai Hasil (Earned Value Analysis) mampu mengendalikan penjadwalan secara efektif dan efisien, karena konsep ini dapat meramalkan hasil pelaporan akhir proyek, sehingga manajemen proyek dapat sesegera mungkin meluruskan kegiatan proyek agar berjalan sesuai rencana jika terjadi penyimpangan. Konsep nilai hasil dapat dikelola dengan bantuan program Primavera 6.0. Pada penelitian ini, data dilakukan dengan menginputkan data ke program Primavera 6.0 maka secara otomatis hasil analisis dapat keluar berdasarkan rumus-rumus kalkulasi yang ada program ini. Sehingga hasil yang dihasilkan dari konsep nilai hasil ini lebih cepat dan akurat. Hasil analisis data yang dilakukan pada Proyek Ruko 3 Tingkat di Jalan Ampera Pontianak menunjukkan bahwa besarnya biaya pelaksanaan (Actual Cost) hingga minggu ke-5 adalah Rp. 258.564.774. Prakiraan biaya akhir proyek (Estimate At Completion) adalah Rp. 1.295.990.982 dan prakiraan waktu akhir proyek (Estimate All Schedule) adalah 273 hari yaitu selesai pada tanggal 26 Oktober 2014. Jika tidak ada evaluasi kinerja, maka kontraktor akan mengalami kerugian (Variance At Completion) sebesar Rp. 139.482.439

Temperature and strain feedback control for shape memory alloy actuated composite plate

There are several input variables that can be used to control the deflection of a shape memory alloy (SMA) composite system such as the resistance or temperature of the SMA actuator and position or strain of the composite plate. It is common to control the actuator directly, however SMA is nonlinear and it exhibits hysteresis which may result in inaccurate control of the plate’s deflection. Thus controlling the plate’s deflection may be more effective by using input measurement from the composite plate. The aim of this study is to propose the optimal feedback variable deflection control of a fiberglass composite plate system using SMA actuators. Two types of variables were investigated which were temperature of the SMA actuator and strain of the composite plate. The feedback control system for SMA actuated composite plate was implemented with different types of sensors; thermocouple and strain gauge. When current is supplied to the SMA actuator, it will contract and produce a force that will deflect the composite plate. During this process, the SMA actuator’s temperature changes with the current supplied and the strain of the composite plate changes during deflection due to torsion and bending. Thus, it is proposed to use these variables as the input to the feedback of the smart composite plate system to control the movement of the plate. Using the adopted control technique of the experimental test bench presented here, the strain feedback system was more effective and energy efficient compared to the temperature feedback for the control of morphing composite plate

Helium-Electrospray: an improved sample delivery system for single-particle imaging with X-ray lasers

Imaging the structure and observing the dynamics of isolated proteins using single-particle X-ray diffractive imaging (SPI) is one of the potential applications of X-ray free-electron lasers (XFELs). Currently, SPI experiments on isolated proteins are limited by three factors: low signal strength, limited data and high background from gas scattering. The last two factors are largely due to the shortcomings of the aerosol sample delivery methods in use. Here we present our modified electrospray ionization (ESI) source, which we dubbed Helium-ESI (He-ESI). With it, we increased particle delivery into the interaction region by a factor of 10, for 26 nm-sized biological particles, and decreased the gas load in the interaction chamber corresponding to an 80% reduction in gas scattering when compared to the original ESI. These improvements will lead to a significant increase in the quality and quantity of SPI diffraction patterns in future experiments using He-ESI, resulting in higher-resolution structures

‘The phoenix that always rises from the ashes’: an exploratory qualitative study of the experiences of an initiative informed by principles of psychological first aid following the Beirut blast

BACKGROUND: On 4 August 2020, an explosion occurred in Beirut, Lebanon. Hundreds of people were killed, thousands injured and displaced. An initiative was rapidly initiated to provide remote support informed by psychological first aid for the mental health of Lebanese young adults affected by the blast. However, little is known about recipients’ experiences of such initiatives. OBJECTIVES: This study aimed to qualitatively explore the experiences of supporters and recipients in the community-led initiative following the blast. METHOD: We recruited a diverse sample of four supporters and four Lebanese recipients who took part in the Beirut initiative. Semi-structured interviews were conducted with participants. Reflexive thematic analysis was used to analyse the qualitative data. RESULTS: We developed five themes from the qualitative interviews, which highlighted ideas around accessibility, alienation, the relationship, elements of the safe space created by the initiative, and unmet needs and areas for improvement. Recipients described the detrimental impact of the blast on their mental health within the Lebanese context and beyond. Recipients and supporters elucidated complex experiences of the support and its impact. CONCLUSIONS: Our findings suggest remote support has the potential to be acceptable for young adults in Lebanon. Further research into support informed by psychological first aid after similar crisis events is warranted

Effects of methylphenidate on blood pressure, QT-interval, and cardiac output in ADHD diagnosed children: A three months� follow-up study

Background: Attention-deficit hyperactivity disorder (ADHD) is one of the most prevalent psychiatric disorders of childhood. It's been suggested that both the condition and the medications used to treat it can affect the cardiovascular system. This study aims to determine whether methylphenidate has the significant effects in cardiac indices. Methods: In this prospective study, 100 newly ADHD-diagnosed children aged 6 to 11 whom all on methylphenidate were included. The demographic, clinical data including the blood pressure and heart rate (HR), echocardiographic, and QT-interval were recorded at baseline and after three months of follow-up. Results: After the follow-up period, we observed no abnormal systolic, diastolic, or mean arterial pressure in any of the participants based on their age, height, and gender (p < 0.001). However, the mean of all these variables was significantly increased (p �0 0 1). Mean pulse pressure was also higher than baseline but it wasn't statistically significant (p = 0.059). No significant change was observed in echocardiographic parameters and QT. Conclusion: Short-term treatment of ADHD in children with methylphenidate does not have a meaningful relationship with hypertension and increased corrected QT interval. However, an increase in blood pressure and corrected QT interval within a non-pathological range suggests that longer follow-ups may reveal an association. © 202

Computational analysis of the groove effect to reduce the cavitation in ball valves

Cavitation is a phenomenon that frequently creates fear within the engineering industry as the violent and critical attacks by cavitation can cause a lot of damage to ball valves. This paper is presented to reduce the risk of cavitation attack due to dramatic pressure drop and to demonstrate the ball valve performance. The ball valve with grooves was simulated and compared with current method under same boundary conditions as with existing experimental of ball valves. The proposed device can be operated in aircraft to isolate the fuel system and the engine fuel system after engine shutdown or emergency. The proposed implementation has successfully shown to eliminate the dramatic pressure drop effects to the ball valve. In the case study, at a closing angle of 40° at which violent cavitation occurs, the ball valve showed increasing cavitation intensity performance to 0.3 or 30%. The average performance of the cavitation index for all cases also increased to 24%

Lift enhancement of NACA 4415 airfoil using biomimetic shark skin vortex generator

An experimental study was conducted to investigate the aerodynamic performance of the NACA 4415 airfoil with and without passive vortex generators. The measurement has been carried out for three considered cases: smooth airfoil for baseline case, airfoil with triangular vortex generator and also airfoil with shark skin shape vortex generator. Both the triangular and shark skin vortex generators were located at 50% of chord from leading edge of the airfoil with a 20° counter-rotating incident angle. The experiments were conducted with Reynold’s number of 100,000. Overall, the results indicate that the lift and drag coefficients, and lift-to-drag ratio, for the airfoil with sharkskin vortex generator are comparatively higher than the other airfoils at some angles of attack. The findings can be applied in optimizing shark skin shape vortex generator for the airfoil performance enhancement

Shortening of atrioventricular delay at increased atrial paced heart rates improves diastolic filling and functional class in patients with biventricular pacing

<p>Abstract</p> <p>Background</p> <p>Use of rate adaptive atrioventricular (AV) delay remains controversial in patients with biventricular (Biv) pacing. We hypothesized that a shortened AV delay would provide optimal diastolic filling by allowing separation of early and late diastolic filling at increased heart rate (HR) in these patients.</p> <p>Methods</p> <p>34 patients (75 ± 11 yrs, 24 M, LVEF 34 ± 12%) with Biv and atrial pacing had optimal AV delay determined at baseline HR by Doppler echocardiography. Atrial pacing rate was then increased in 10 bpm increments to a maximum of 90 bpm. At each atrial pacing HR, optimal AV delay was determined by changing AV delay until best E and A wave separation was seen on mitral inflow pulsed wave (PW) Doppler (defined as increased atrial duration from baseline or prior pacemaker setting with minimal atrial truncation). Left ventricular (LV) systolic ejection time and velocity time integral (VTI) at fixed and optimal AV delay was also tested in 13 patients. Rate adaptive AV delay was then programmed according to the optimal AV delay at the highest HR tested and patients were followed for 1 month to assess change in NYHA class and Quality of Life Score as assessed by Minnesota Living with Heart Failure Questionnaire.</p> <p>Results</p> <p>81 AV delays were evaluated at different atrial pacing rates. Optimal AV delay decreased as atrial paced HR increased (201 ms at 60 bpm, 187 ms at 70 bpm, 146 ms at 80 bpm and 123 ms at 90 bpm (ANOVA F-statistic = 15, p = 0.0010). Diastolic filling time (P < 0.001 vs. fixed AV delay), mitral inflow VTI (p < 0.05 vs fixed AV delay) and systolic ejection time (p < 0.02 vs. fixed AV delay) improved by 14%, 5% and 4% respectively at optimal versus fixed AV delay at the same HR. NYHA improved from 2.6 ± 0.7 at baseline to 1.7 ± 0.8 (p < 0.01) 1 month post optimization. Physical component of Quality of Life Score improved from 32 ± 17 at baseline to 25 ± 12 (p < 0.05) at follow up.</p> <p>Conclusions</p> <p>Increased heart rate by atrial pacing in patients with Biv pacing causes compromise in diastolic filling time which can be improved by AV delay shortening. Aggressive AV delay shortening was required at heart rates in physiologic range to achieve optimal diastolic filling and was associated with an increase in LV ejection time during optimization. Functional class improved at 1 month post optimization using aggressive AV delay shortening algorithm derived from echo-guidance at the time of Biv pacemaker optimization.</p

Review of mechanical performance of oil palm fiber and coconut fiber as an additional material in concrete

Waste can be categorized as organic waste and chemical waste. Organic waste generated from agriculture industry had been proofed to be use in concrete production to enhance the concrete performance. The main purpose of adding the fiber in concrete structure is to control cracking due to plastic shrinkage and to drying shrinkage. Besides, it can also reduce the permeability of concrete, thus, reduce the bleeding of water. Some types of fibers produce greater impact, abrasion, and shatter resistance in concrete. Therefore, this paper reviewed the mechanical properties of concrete containing oil palm and coconut fiber as an additional material in concrete. Coconut fiber length is longer than oil palm fiber. Therefore, in comparison, by adding coconut fiber in concrete up to 5% may reduce the flexural and tensile strength of the concrete due to agglomerate effect of the fiber. In contrast, for oil palm fiber, beyond 5% of addition in concrete will improve the flexural and tensile strength of the concrete due to the length effect of the fiber. By discussing both organic fiber as an additional material to strengthen the concrete, it can contribute to the body of knowledge in term of reducing cracks in concrete. Besides, it will give a better understanding to readers regarding the function of the materials in concrete