Penggunaan Steel Fiber Sebagai Pengganti Besi Tulangan pada Pengecoran Pelat Lantai Proyek BPSP XI PT Kawasan Industri Wijayakusuma Semarang

Kawasan industri merupakan area di mana berbagai jenis industri beroperasi seperti manufaktur, produksi, perakitan, dan pengolahan. Salah satu kawasan industri di Indonesia adalah Kawasan Industri Wijayakusuma (KIW). Sebagai pengembang dan pengelola kawasan, pemanfaatan lahan yang dimiliki KIW selalu ditingkatkan guna memenuhi pelayanan terhadap tenant seperti pembangunan pabrik/gudang BPSP XI ini KIW melakukan inovasi yaitu dengan menggunakan Steel Fiber (Dramix) sebagai pengganti besi tulangan atau wiremesh pada pengecoran pelat lantai dasar, hal ini dilakukan untuk menekan cost, namun tetap mengutamakan mutu yang berkualitas. Penelitian ini menggunakan metode trial and error dan juga observasi yang dilakukan di laboratorium dengan mengacu pada SNI 03- 2834-2000. Sampel beton menggunakan balok dengan dimensi 15x15x60 cm dan kubus 15x15x15 cm. Komposisi campuran beton dramix dilakukan dengan trial untuk mendapatkan prosentase dari total agregat kasar yang optimum dengan kuat tekan rencana K-175 dengan perbandingan FAS 0,46. Hasil trial dalam penelitian ini menghasilkan persentase 17,29 % lebih besar kuat tekan beton dramix yaitu 241,90 Kg/cm2 dibandingkan dengan kuat tekan beton normal yaitu 212,87 Kg/cm2 di umur 28 hari. Biaya yang dikeluarkan untuk membuat beton dramix ini lebih murah Rp 197.816 per m3 dibandingkan dengan beton bertulang dengan rancang campur kuat tekan yang sama. Penggunaan steel fiber (dramix) pada pengecoran pelat lantai dasar merupakan inovasi yang tepat, karena memiliki kuat tekan yang tinggi dan harga terjangkau

Exciton-Phonon Interactions Govern Charge-Transfer-State Dynamics in CdSe/CdTe Two-Dimensional Colloidal Heterostructures.

CdSe/CdTe core-crown type-II nanoplatelet heterostructures are two-dimensional semiconductors that have attracted interest for use in light-emitting technologies due to their ease of fabrication, outstanding emission yields, and tunable properties. Despite this, the exciton dynamics of these complex materials, and in particular how they are influenced by phonons, is not yet well understood. Here, we use a combination of femtosecond vibrational spectroscopy, temperature-resolved photoluminescence (PL), and temperature-dependent structural measurements to investigate CdSe/CdTe nanoplatelets with a thickness of four monolayers. We show that charge-transfer (CT) excitons across the CdSe/CdTe interface are formed on two distinct time scales: initially from an ultrafast (∼70 fs) electron transfer and then on longer time scales (∼5 ps) from the diffusion of domain excitons to the interface. We find that the CT excitons are influenced by an interfacial phonon mode at ∼120 cm-1, which localizes them to the interface. Using low-temperature PL spectroscopy we reveal that this same phonon mode is the dominant mechanism in broadening the CT PL. On cooling to 4 K, the total PL quantum yield reaches close to unity, with an ∼85% contribution from CT emission and the remainder from an emissive sub-band-gap state. At room temperature, incomplete diffusion of domain excitons to the interface and scattering between CT excitons and phonons limit the PL quantum yield to ∼50%. Our results provide a detailed picture of the nature of exciton-phonon interactions at the interfaces of 2D heterostructures and explain both the broad shape of the CT PL spectrum and the origin of PL quantum yield losses. Furthermore, they suggest that to maximize the PL quantum yield both improved engineering of the interfacial crystal structure and diffusion of domain excitons to the interface, e.g., by altering the relative core/crown size, are required.We acknowledge financial support from the EPSRC [EP/M005143/1] and Winton Program for the Physics of Sustainability. The work of SI is supported by the program ANR JCJC NannoDoSe

Technical note: Extension of CERR for computational radiomics: a comprehensive MATLAB platform for reproducible radiomics research

PurposeRadiomics is a growing field of image quantitation, but it lacks stable and high-quality software systems. We extended the capabilities of the Computational Environment for Radiological Research (CERR) to create a comprehensive, open-source, MATLAB-based software platform with an emphasis on reproducibility, speed, and clinical integration of radiomics research. MethodThe radiomics tools in CERR were designed specifically to quantitate medical images in combination with CERR's core functionalities of radiological data import, transformation, management, image segmentation, and visualization. CERR allows for batch calculation and visualization of radiomics features, and provides a user-friendly data structure for radiomics metadata. All radiomics computations are vectorized for speed. Additionally, a test suite is provided for reconstruction and comparison with radiomics features computed using other software platforms such as the Insight Toolkit (ITK) and PyRadiomics. CERR was evaluated according to the standards defined by the Image Biomarker Standardization Initiative. CERR's radiomics feature calculation was integrated with the clinically used MIM software using its MATLAB((R)) application programming interface. ResultsThe CERR provides a comprehensive computational platform for radiomics analysis. Matrix formulations for the compute-intensive Haralick texture resulted in speeds that are superior to the implementation in ITK 4.12. For an image discretized into 32 bins, CERR achieved a speedup of 3.5 times over ITK. The CERR test suite enabled the successful identification of programming errors as well as genuine differences in radiomics definitions and calculations across the software packages tested. ConclusionThe CERR's radiomics capabilities are comprehensive, open-source, and fast, making it an attractive platform for developing and exploring radiomics signatures across institutions. The ability to both choose from a wide variety of radiomics implementations and to integrate with a clinical workflow makes CERR useful for retrospective as well as prospective research analyses

Renal vein to renal collecting system fistula: An extreme complication from central venous thrombosis secondary to indwelling catheter

Central venous catheters are routinely used for resuscitation, chemotherapy and nutrition but are not without risk. Central lines are the most common extrinsic cause of venous thrombosis in neonates and infants. We present an ex-36 week 1800g infant baby girl recovering after a staged repair of gastroschisis with ileostomy and mucous fistula formation. The patient was receiving parenteral nutrition through an indwelling saphenous vein tunneled catheter, with its tip in the inferior vena cava. The patient developed polyuria, with a characteristic odor of the parenteral nutrition and a urine analysis showed glucose and triglyceride levels consistent with the composition of the parenteral nutrition fluid. A fluoroscopic cysto-urogram and an inferior vena-cavogram showed a catheter-associated inferior vena cava thrombosis leading to backpressure changes, diverting all intravenous contrast into the right renal vein and to renal collecting system, thus elucidating the route of the parenteral nutrition fluid reaching the bladder. Our case represents an extreme case of complicated central venous thrombosis. We emphasize the importance of practicing a high index of suspicion for thrombotic complications in severely ill neonates with central venous access. An early diagnosis and aggressive management may prevent progression of the disease towards an overwhelming complication. Keywords: Central venous catheterization complications, Renal vein-collecting system connection, Renal vein- collecting system fistul

Research data supporting "Exciton-Phonon Interactions Govern Charge-Transfer-State Dynamics in CdSe/CdTe Two-Dimensional Colloidal Heterostructures"

The dataset contains the raw data associated with Figures 1-2 and Figure 4-6. The data in Figure 3 is derived from the raw data in Figure 2 as explained in the text. The data in Figure 7 is derived from Figure 5 using the fitting as explained in the main text. The raw data includes the the femotsecond pump probe data and associated FFT maps, absoprtion and photoluminsence spectra, PDS data and raw data associated with cryogenic PL measurements, Raman data and TCSPC data