U wave: an Important Noninvasive Electrocardiographic Diagnostic Marker

Study of U waves exemplifies important clinical role of noninvasive electrocardiography in modern cardiology. Present article highlights significance of U waves with a clinical case and also summarizes in brief the history of the same

Statistical Model for Predicting Slump and Strength of Concrete Containing Date Seeds

Incorporating agro-based waste in concrete can reduce environmental pollution and lead to preserving the ecosystem. In order to reduce trial and error in achieving desired slump and compressive strength of concrete containing Date Seed (DS), this paper examines the slump and compressive strength of concrete using date seeds as a partial replacement for crushed granite. Preliminary tests were conducted on the aggregates to ascertain their suitability for concrete production. Concrete with DS-crushed granite ratios of 0:100, 5:95, 10:90, 15:85, and 20:80 were prepared using a mix ratio of 1:2:4 and a water-cement ratio of 0.5. Slump loss was used to estimate the workability of the fresh concrete. The freshly prepared concrete was cast in 150 x 150 x 150 mm and the compressive strength was determined after curing by full immersion in water for 7, 14, 21 and 28 days. Results showed that the slump of concrete increased with an increase in the content of date seed. The compressive strength was inversely proportional to the date seed content with a DScrushed granite ratio of 20:80 recording the lowest compressive strength (20N/mm2 ). Linear regression models for slump and compressive strength were developed and found to be sufficient in explaining the experimental data based on a Mean Square Error (MSE) of 0.37 and 0.029 and R2 of 88% and 99% obtained for slump and compressive strength respectively. The study has concluded that DS can be used as a partial replacement for crushed granite in concrete and a linear model is sufficient in predicting the slump and strength of concrete containing date seed

PENGARUH KOMITMEN DAN TURNOVER INTENTION TERHADAP KINERJA KARYAWAN

Penelitian ini bertujuan untuk menguji pengaruh komitmen dan turnover intention terhadap kinerja karyawan yang ada diperusahaan lampung. Methode yang digunakan adalah dengan menggunakan uji kuesioner yang disebarkan melalui media online. Sample dari penelitian ini berjumlah 81 responden. Uji statistic dilakukan dengan menggunakan Structural Equation Modelling berbasis SmartPLS 3. Uji validitas dengan menggunakan nilai faktor loading. Sedangkan uji reliabilitas menggunakan nilai Cronbach’s alpha, reliabilitas komposit dan Average Varianvce Extracted (AVE). dari hasil uji hipotesis komitmen terhadap kinerja karyawan berpengaruh positif dan signifikan. Sedangkan Turnover Intention berpengaruh negatif terhadap kinerja karyawan dan tidak signifikan

PENGARUH KOMITMEN DAN TURNOVER INTENTION TERHADAP KINERJA KARYAWAN (STUDY KASUS PERUSAHAAN YANG BERADA DI LAMPUNG)

This study aims to examine the effect of commitment and intention to turnover on the performance of existing employees in Lampung. The method used is to use a test questionnaire distributed through online media. The sample of this study may be 81 respondents. The statistical test was carried out using Structural Equation Modeling based on SmartPLS 3. The validity test used the loading factor value. While the reliability test used Cronbach's alpha value, composite reliability and Average Variance Extracted (AVE). From the results of hypothesis testing, commitment to employee performance has a positive and significant effect. Meanwhile, Turnover Intention has a negative and insignificant effect on employee performance). &nbsp

Baller-Gerold Syndrome a Rare Cause of Heart-Hand Syndrome

Heart hand syndromes are characterized by radial abnormalities and associated defects in the heart. We here describe an extremely rare heart hand syndrome known as Baller-Gerold syndrome

SYNGAS PRODUCTION FROM GREENHOUSE GASES VIA DRM OVER Ni/Al2O3 CATALYST: EFFECT OF Ca ADDITION

In view of the escalating global warming phenomenon, utilization of CO2 has become an important event in recent decades. Syngas production via Dry Reforming of Methane (DRM) is one of the promising methods to produce COX-free hydrogen as a renewable and sustainable energy source. DRM requires an active functioning catalyst since it is a highly endothermic process. The catalytic behaviour of 10 wt.% Ni supported on Al2O3 and doped with CaO is investigated for DRM. In the present study, the effect of alkaline earth metal oxide (CaO) loading (varying from 0.5-2.0 wt.%) on the structure, properties, stability, and performances of the Ni-CaO/Al2O3 catalyst for the DRM process is studied. The catalysts were prepared by wet impregnation method and characterized by Scanning Electron Microscopy (SEM) to study the morphology of the fresh and spent catalyst and Thermogravimetric Analyzer (TGA), which changes in physical and chemical properties of the catalysts are measured as a function of increasing temperature and time. DRM is carried out in a fixed-bed reactor at a temperature range from 600°C to 800°C. Further, the effect of CH4 partial pressure on the conversion of CH4, CO2 and syngas ratio were also investigated. The thermal stability of the catalyst increased on loading with CaO, and CAT-4 (1.5 wt.% CaO, 8.5 wt.% Ni on Al2O3) displayed the optimum activity, stability, and least coke formation

Rational design and direct fabrication of multi-walled hollow electrospun fibers with controllable structure and surface properties

Multi-walled hollow fibers with a novel architecture are fabricated through utilizing a direct,one-step tri-axial electrospinning process with a manufacturing methodology which does not require any post-treatments for the removal of core material for creating hollowness in the fiber structure. The hydrophilicity of both inner and outer layers’ solution needs to be dissimilar and carefully controlled for creating a two-walled/layered hollow fiber tructure with a sharp interface. To this end, Hansen solubility parameters are used as n index of layer solution affinity hence allowing for control of diffusion across the layers and the surface porosity whereby an ideal multi-walled hollow electrospun fiber is shown to be producible by tri-axial electrospinning process. Multi-walled hollow electrospun fibers with different inner and outer diameters and different surface morphology are successfully produced by using dissimilar material combinations for inner and outer layers (i.e., hydrophobic polymers as outer layer and hydrophilic polymer as inner layer). Upon using different material combinations for inner and outer layers, it is shown that one may control both the outer and inner diameters of the fiber. The inner layer not only acts as a barrier and thus provides an ease in the encapsulation of functional core materials of interest with different viscosities but also adds stiffness to the fiber. The structure and the surface morphology of fibers are controlled by changing applied voltage, polymer types, polymer concentration, and the evaporation rate of solvents. It is demonstrated that if the vapor pressure of the solvent for a given outer layer polymer is low, the fiber diameter decreases down to 100 nm whereas solvents with higher vapor pressure result in fibers with the outer diameter of up to 1 μm. The influence of electric field strength on the shape of Taylor cone is also monitored during the production process and the manufactured fibers are structurally investigated by relevant surface characterization techniques

ANALISA PERBANDINGAN STRUKTUR PILAR JEMBATAN DENGAN TIPE SATU KOLOM DAN DUA KOLOM PADA PROYEK JALAN PENDEKAT JEMBATAN MAHAKAM IV SISI SAMARINDA KOTA

Salah satu solusi dari kemacetan yang terjadi pada jalur lalu lintas masuk-keluar kotaSamarinda yaitu dengan pembangunan Jembatan Mahakam IV. Berdasarkan perencanaan awal,Jembatan Mahakam IV akan terdiri dari flyover sisi samarinda kota, flyover sisi samarinda sebrangdan bentang jembatan. Pada struktur flyover menggunakan pier beton bertulang dengan material betonbertulang mutu K-300, baja mutu U-39 (ulir) dan U-24 (polos) dan memiliki bentuk pier hammer headserta variasi ketinggian yang berbeda namun penulis memfokuskan pada pier 9 dengan ketinggian23,767 m. Seiring dengan makin berkembangnya teknologi telah banyak dikembangkan berbagaibentuk pier. Namun harus diperhatikan gaya tekan aksial dan momen terhadap desain pilar agar dapatmenghindari potensi tekuk local (local buckling). Tujuan penelitian ini adalah melakukan analisastruktur pada pilar jembatan dengan tipe satu kolom (hammer head) dan tipe dua kolom (trestle)dengan bantuan software SAP2000.Hasil studi perencanaan memperlihatkan pada kolom pier hammerhead menggunakan tulangan 165 D 32 dan sengkang 8 D 16 – 150 dengan nilai momen 62265,1 kNmlebih efektif dan efisien dibandingkan tipe kolom trestle menggunakan tulangan 200 D 32 dansengkang 3 D 16 – 200 dengan nilai momen 42543,2 kNm dan ditambah pengaku kolom (stiffer)