CRACK ANALYSIS OF CFRP REINFORCED CONCRETE BEAMS UNDER SECONDARY LOADING

The paper established the calculation formulas on the average crack spacing and the maximum crack width of CFRP（Carbon Fiber Reinforced Polymer）reinforced concrete beam under the secondary loading. Conversion of CFRP plate area into the reinforcement ratio of the reinforced beam, the calculation formula on the average crack spacing of CFRP reinforced concrete beam under the secondary loading was established. On basis of the calculation formula on the maximum crack width of concrete beam, the calculation formula on the maximum crack width of CFRP reinforced concrete beam under the secondary loading was established. The average crack spacing and the maximum crack width calculated by the formulas in the paper were compared with the test data, it was verified that the formula is correct.

SURVIVAL RATE of TIGER GROUPER LARVA (Epinephelus fucoguttatus) HOUSEHOLD SCALE ON THE NORTH COAST of BALI

Tiger grouper (Epinephelus fuscoguttatus) hatchery at the household scale has contributed to the increase in national grouper seed production. The main problem in tiger grouper cultivation is the availability of superior seeds. Where superior tiger grouper seeds must have fast growth, be resistant to new environments, low FCR, have perfect morphology and be resistant to. Superior seeds of tiger grouper can be seen from the value of Survival Rate (SR), where superior seeds will have a much higher SR when maintained. The purpose of this study was to determine the Survival Rate of tiger grouper hatchery in household-scale hatcheries located on the North Coast of Bali as the main parameter and water quality as a supporting parameter. Methods of data collection is done by using 4 ways: survey, active participation, observation, and interviews. Survival rate data analysis was carried out by performing calculations based on the SR calculation formula and analyzed descriptively. The results of observations of water quality are classified as good for the value of Salinity (33-35 ppt), Temperature (28-29.4 oC), and DO (6-6.5 ppm). While the pH value can be said to be not good for tiger grouper hatchery and rearing with a pH value of (7.3-7.4). The result of the calculation of the Survival Rate is 20% with a total of ± 24,000 seeds. From the percentage of survival rate, it can be said that the survival rate of tiger grouper larvae in this household-scale hatchery is still low. However, it should be noted that a low survival rate in grouper hatcheries does not always affect the value of profits and losses of a grouper hatchery business.

Assessment of the Development of the Stock Market in the Russian Federation in a Crisis

The article analyzes the literature and provides an assessment of the development of the stock market in the Russian Federation between 2016–2020. Today, the process of improving electronic technologies for carrying out operations in the stock market is also a continuing segment of the financial market. A methodology for assessing the development of the stock market in the example of the Russian Federation is proposed, with a description of the essence of the assessment indicator, the calculation formula and the threshold value. According to the results of the assessment and to the author’s proposed methodology, measures are proposed to improve the work of the stock market.

Quantitative biometric cutoffs for the choice of the intraocular lens power calculation formula for a recently introduced nondiffractive extended depth-of-focus intraocular lens

Purpose This study aimed to analyze biometry values cutoffs for the choice of the best intraocular lens power calculation formula for AcrySof IQ Vivity intraocular lens. Methods The study was designed as interventional case series with 3 months of follow-up. Intraocular lens power calculation formulas included Barrett Universal II and SRK/T. The first was adopted for the intraocular lens power choice. The quantitative analysis focused on the identification of specific biometric cutoffs considering axial length, anterior chamber depth, and corneal powers. We included only the dominant eye in the statistical analysis. Results One hundred and eight eyes of 54 patients (23 males; mean age 62 ± 5 years) with no ocular diseases were included. Best-corrected visual acuity improved from 0.3 ± 0.2 to 0.0 ± 0.0 logMAR. All the eyes reached spectacles-free far and intermediate visions; a spherical addition of + 1.0D was necessary to adjust near vision. We identified significant quantitative cutoffs based on axial length and anterior chamber depth. Barrett Universal II resulted the best formula for eyes disclosing an axial length >25 mm, whereas SRK/T turned out to be the best choice for the eyes characterized by an anterior chamber depth <2.8 mm. Our analysis disclosed an overall sensitivity of 0.8 and a specificity of 0.7 ( p < 0.01). Conclusions Axial length and anterior chamber depth influence the choice of Barrett Universal II and SRK/T formulas. Quantitative biometric cutoffs may be useful to discriminate the best formula to be adopted.

On the assessment of the reliability of the train radio communication channel

The research purposeis to develop an approach to assessing the reliability of a train radio communication channel based on the representation of a radio communication network in the form of a model that includes both traditional elements (various types of equipment, a wire channel) and a radio channel, which is proposed to be described by the availability of radio coverage, which varies depending on the location of the mobile subscriber. In the research methods of the theory of reliability, and, in particular, the assessment of the availability factor of the elements of the radio communication system and communication channels, dynamically changing during the movement of the mobile radio station. In addition, to assess the energy of radio channels, the theory of radio wave propagation was applied, including on the basis of industry recommendations for calculating radio communication networks of JSC Russian Railways. As result of the research, a method was proposed for assessing the dependence of the reliability of a train radio communication channel (in terms of readiness) on the track coordinate. In this case, the radio communication channel dynamically changes the composition of the elements when the mobile subscriber moves along the railway section. Simultaneously, for each point of the section, the calculation formula is also dynamically changed, which makes it possible to find the value of the readiness of the communication channel. The proposed approach allows to identify the sections of technological radio communication networks that are weakest from the point of view of communication reliability and take this information into account when planning work to improve the reliability of communication networks.

Characteristic Analysis and Experiment of a Flow Distribution Valve

The comprehensive characteristics of flow distribution valve in water system are analyzed. The flow balance valve can change the drag efficient according to the condition of system, and can measure the flowrate. The structure of the flow distribution valve is introduced, and the theoretical calculation formula for the regulating valve are derived. A rated flowrate from 10.65m3/h to 20.48m3/h are offered in the numerical work. Fluent CFX analyses show good behaviours: through the benefits of V-ball valve good linearity and regulation characteristics, when the valve throttling, the system flow can maintain a relatively stable state, it can be conducived to improve the measurement accuracy of the distribution valve. The experimental results show that the measure accuracy is less than 5.8%.

Stress analysis and applicability analysis of the elliptical head

As the main pressure components of pressure vessels, the mechanical performance of cylinders and heads affects the normal operation of pressure vessels. At present, no unified theoretical formula exists for the connection region between an elliptical head and the cylinder. Therefore, the authors consider the standard elliptical head as the research object. First, the theoretical stress calculation formula is deduced according to the deformation continuity equation. Second, the stress is experimentally measured using an internal-pressure thin-walled-vessel stress measurement device, and the theoretical and experimental stress values in the discontinuous region between the elliptical head and cylinder are analysed and compared to verify the accuracy and applicability of the theoretical stress calculation formula. The results show that the theoretical stress calculation formula in the discontinuous region between the elliptical head and cylinder is valid. By comparing and analysing the theoretical and experimental stress values, the accuracy and applicability of the theoretical stress calculation formula in the discontinuous region are verified. The findings can provide guidance for the stress measurement of internal-pressure vessels.

PENGARUH INFLUENCER MARKETING DAN BRAND AWARENESS TERHADAP KEPUTUSAN PEMBELIAN STREET BOBA

This studyuses a descriptive quantitative study that aims to view and analyze the influence of influencermarketing and brandawareness on Street Boba'spurchasingdecisions. The sampling technique in this study used a non-probability sampling technique, so that the entire population was sampled using the Lemeshow calculation formula and a sample of 100 respondents was obtained. Smart PLS 3.0 software and Microsoft Office Excel are used in hypothesis testing. The examiners' resultsare: (1) There is a significant influence of influencermarketing on purchasingdecisions, (2) There is a significant influence of brandawareness on purchasingdecisions. Penelitian ini merupakan penelitian deskriptif kuantitatif yang digunakan untuk menganalisis dan mengetahui pengaruh influencer marketing dan brand awareness terhadap keputusan pembelian Street Boba. Penelitian ini menggunakan sampel klien Street Boba di Jakarta Selatan. Teknik pengambilan sampel dalam penelitian ini menggunakan teknik non-probability sampling, sehingga rumus perhitungan Lemeshow dipilih dengan menggunakan seluruh populasi dan diperoleh sampel sebanyak 100 responden. Pengujian hipotesis menggunakan software SmartPLS 3.0 dan Microsoft Office Excel. Hasil pengujian adalah (1) influencermarketing berpengaruh signifikan terhadap keputusan pembelian dan (2) brandawareness berpengaruh signifikan terhadap keputusan pembelian.

Unification of gravitation and electromagnetic force(second portion)

based on the new discovery of moving photon do create force and a formula of describe this new discovery: Applying this discovery from the micro world to the macro world, show that from atomic world to the galaxy world, the nature has been working obeys this law, and their actions can all be described by this formula. The Coulomb law and Newton law of university gravitation are only calculation formula in the specific condition status.

Unification of gravitation and electromagnetic force(second portion)

based on the new discovery of moving photon do create force and a formula of describe this new discovery: Applying this discovery from the micro world to the macro world, show that from atomic world to the galaxy world, the nature has been working obeys this law, and their actions can all be described by this formula. The Coulomb law and Newton law of university gravitation are only calculation formula in the specific condition status.