Perfect initialization of a quantum computer of neutral atoms in an optical lattice of large lattice constant

We propose a scheme for the initialization of a quantum computer based on neutral atoms trapped in an optical lattice with large lattice constant. Our focus is the development of a compacting scheme to prepare a perfect optical lattice of simple orthorhombic structure with unit occupancy. Compacting is accomplished by sequential application of two types of operations: a flip operator that changes the internal state of the atoms, and a shift operator that moves them along the lattice principal axis. We propose physical mechanisms for realization of these operations and we study the effects of motional heating of the atoms. We carry out an analysis of the complexity of the compacting scheme and show that it scales linearly with the number of lattice sites per row of the lattice, thus showing good scaling behavior with the size of the quantum computer.Comment: 18 page

Analysis of the Utilization of Air-Cooled Blast Furnace Slag as Industrial Waste Aggregates in Self-Compacting Concrete

In this work, the effects of replacing the aggregates of self-compacting concrete by air-cooled blast furnace slag have been analysed. Different mixes have been manufactured by substituting the fine and coarse natural aggregates by air-cooled blast furnace slag. The fracture energy and the tensile and compressive strength have been determined for each mix. The self-compacting properties of the mixes, or the absence of them, have been observed. The main goals of this research are the decrease of the price of aggregates, reduction of the industrial waste, and attenuation the rate of consumption of natural resources. The results show that the self-compactability of the concrete is gradually lost as the slag content is increased, thus, when the ratio of replacement is low, the concrete keeps the self-compacting properties. Nevertheless, the loss of self-compaction affects the mechanical properties by increasing its strength. An air-cooled blast furnace slag did not present problems of heavy metals leaching.Ministerio de Economía y Competitividad BIA2016-75431-RUniversidad de Sevilla VI Plan Propio de Investigació

Comparison of material properties of SCC concrete with steel fibres related to ingress of chlorides

The paper focuses on the evaluation of chloride ion diffusion coefficient of self-compacting concrete with steel fibre reinforcement. The reference concrete from Ordinary Portland Cement (OPC) and Self-Compacting Concrete (SCC) with several values of added steel fibres-0%, 1% and 2% of weight-were cast in order to investigate the effect of fibres. The three procedures of diffusion coefficient calculation are presented-rapid chloride penetration test, accelerated penetration tests with chloride as well as the surface measurement of electrical resistivity using Wenner probe. The resulting diffusion coefficients obtained by all methods are compared and evaluated regarding the basic mechanical properties of concrete mixtures.Web of Science103art. no. 22

EFEK PENAMBAHAN SERAT POLYPROPYLENE TERHADAP KUAT TEKAN DAN MODULUS ELASTISITAS SELF COMPACTING MORTAR (SCM)

Pada dinding pracetak penggunaan fiber reinforced sebagai lapis kulit dinding sandwich dengan metode self-compacting mortar (SCM) akan sangat tepat digunakan karena akan lebih mudah dan cepat dalam proses produksi panel dinding pracetak. Penelitian ini bertujuan untuk mengetahui nilai kuat tekan dan modulus elastisitas pada self-compacting mortar (SCM) dengan penambahan serat polypropylene. Penambahan serat polypropylene dalam adukan self-compacting mortar (SCM) diberikan dalam 4 (empat) variasi, yaitu: 0 kg/m3; 0,5 kg/m3; 1 kg/m3; 1,5 kg/m3 serat polypropylene. Adukan mortar ditetapkan dengan perbandingan volume: 1 semen dan 5 pasir, f.a.s 0,9 dan sikamen NN 1,2 dari berat semen. Pengujian yang dilakukan pada kuat tekan dan modulus elastisitas dilakukan setelah mortar berumur 28 hari. Data untuk setiap variasi campuran serat diperoleh dari 3 (tiga) benda uji silinder berukuran 15 x 30 cm. Dari hasil penelitian didapatkan kuat tekan silinder mortar dengan penambahan serat polypropylene 0 kg/m3; 0,5 kg/m3; 1 kg/m3;dan 1,5 kg/m3 Berturut turut adalah 12,44 MPa; 10,40 MPa; 12,23 MPa; 9,48 MPa. Dan besarnya nilai modulus elastisitas dengan campuran 0 kg/m3; 0,5 kg/m3; 1 kg/m3; 1,5 kg/m3serat polypropylene. Berturut turut sebesar 9959,53MPa; 8650,95MPa; 10080,19 MPa; dan 8074,94 MPa

The development of mobile robot for air pollution data capture (POPOBOT)

In the Modern era, the environmental issues have given significant impact to the human live. The air pollution indoor and outdoor environment sometimes dangerous to the human health and it needs to be justified. To fulfill this purpose, telemeasurement process and technique should be used. Therefore, in this research, the mobile robot with equipped by several air quality parameters sensors is developed. The robot is controlled using remote control and using wireless connection system. The air quality in target area will be monitored by using sensors which will capture data and send it to the Central Control (laptop) for analyzing. And then to be able monitor certain area investigation, the mobile robot is guided by using wireless camera. Result from this project can make user to monitor and navigate the target area by using mobile robot and this can make user know the situation on that area. PIC16F887A has been chosen in this project as the main device which is controlling all activities of the mobile robot. Data capture and robot movement has been done in wireless to make user easy to do the monitoring activities. From result, knowing that the error percentage of the data capture is small compare to the digital meter. So from that knowing this project is effective because it make user easy to do air pollution monitoring process also can prevent the gas poisoning cases from happen

Effects of Steel and Polypropylene Fiber Addition on Interface Bond Strength between Normal Concrete Substrate andSelf-Compacting Concrete Topping

Based on facts that the composite action in semi-precast and strengthened structural system depends on the bond strength of the interface between concrete faces of different ages, this preliminary research is aimed to investigate effects of mixed polypropylene (PPF) and steel fiber (SF) addition on the hardened properties of Self-Compacting Concrete (SCC) and its bond strength when used as topping layer on normal concrete substrate. Effects of hybrid fiber addition on the hardened properties of SCC were investigated based on the compressive, splitting tensile and flexural strength of concrete specimens which is tested in 28 days of age. In the next step, the tensile and shear strength of the interface were evaluated using indirect splitting tensile and bi-surface shear test method. In this research, fiber addition were prepared using 1 kg/m PPF and various SF addition ranging from 15 kg/m3, 20 kg/m3, 25 kg/m3 and 30 kg/m3. Test results indicate that hybrid fiber addition does not affect the compressive strength significantly but it leads ositive improvement to the splitting tensile and flexural strength of hardened SCC and also improve the bond strength between SCC and normal concrete. Hybrid fiber addition of 1 kg/m3 PPF which is combined with 20 kg/m3 SF can be suggested as optimum composition for Hybrid Fiber Reinforced Self-Compacting Concrete (HyFRSCC) that will be used as topping or overlay material based on its hardened properties and interface strength

Electrochemical Potential Monitoring of Corrosion and Coating protection of mild steel Reinforcement in Concrete.

The corrosion and protection behavior of a mild steel reinforcement in concrete, partially immersed in different test media, was investigated at ambient temperature by potential monitoring technique. The work was carried out using a digital voltmeter and a copper sulfate electrode (CSE) as the reference electrode. The obtained results showed that corrosion occurred on the embedded steel by the processes of anodic and cathodic reactions. The active corrosion of the steel occurred by the depassivation of the hydroxyl ions stabilized passive film on the steel's surface and the consequent anodic dissolution of the reinforcement bars. The corrosion of the embedded steel was enhanced by the diffusion of chloride, sulfate, and carbonate ions from the test media, in addition to the absorbed oxygen and water/moisture. The coating of the reinforcement steel with, paint before embedding in concrete block gave some measure of protection. Coating of the concrete blocks externally was a more protective method. However, a combination of the steel coating and external coating of the concrete block showed the most effective corrosion protection comparatively

Structure of plastically compacting granular packings

The developing structure in systems of compacting ductile grains were studied experimentally in two and three dimensions. In both dimensions, the peaks of the radial distribution function were reduced, broadened, and shifted compared with those observed in hard disk- and sphere systems. The geometrical three--grain configurations contributing to the second peak in the radial distribution function showed few but interesting differences between the initial and final stages of the two dimensional compaction. The evolution of the average coordination number as function of packing fraction is compared with other experimental and numerical results from the literature. We conclude that compaction history is important for the evolution of the structure of compacting granular systems.Comment: 12 pages, 12 figure