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Grid Array Ball (BGA) has been used in the production of electronic devices and components because of its small size, high I / O port density and so on. However, BGA solder joint defects will reduce the performance of the motherboard. Because micro-focus X-ray BGA solder joint image has a large number...

In order to study the stress distribution features of the surrounding rocks a long the circle tunnel after the roadway excavated and the radius size of there leased circle, first analysis of the stress distribution characteristics of the surrounding rock, on this basis, circular tunnel for the elastic...

this paper expects to examine the causal relationship of clean/fossil energy consumption with economic growth, environmental issues, and social problems. Especially, China consumed 2,735 million tons of oil equivalent of primary energy including 86% of fossil energy and 12.3% of clean energy, accounting...

Machining is the main processing method of the steam turbine system. Due to its complex structure, numerous materials, and complex process, the massive types and quantity of cutting tools generated. The key to improve the machining efficiency and reduce the processing cost is adopting the advanced cutting...

College entrance examination reform program has aroused widespread concern in the community, and change of the way of English exam presents new challenges for college English teaching. This paper studies for realizing the seamless connection between the basic English teaching and college English teaching,...

In this paper, the influence of serial resistance Rs and shunt resistance Rsh for PV cells are studied. The series resistance Rs has a great influence on the output characteristics of the PV cells. Therefore, it is particularly important to solve the value of Rs for the model of solar cells. Rsh is very...

With the development of economy, the level of science and technology has improved greatly. People’s demand of the Internet information is increasing in their daily work and life, so people’s demand of the Internet technology is even higher. The current mobile Internet technology is developing, as a result...

This paper proposes a novel foot-pad omni-directional locomotion interface, establishes planar walking algorithm for it in detail. The proposed locomotion interface allows users walking omni-directionally in a virtual environment, which can improve users’ immersion characteristic significantly. The...

With the rapid development of Internet and computer technology, the network information is exploding combined with the network capture technology and text analysis technology to achieve the evaluation of content resources has become hot research fields. The use of this method is significant to the resources...

Cuckoo search (CS) is a novel biologically inspired algorithm and has been widely applied to many fields. Although some binary-coded CS variants are developed to solve 0–1 knapsack problems, the search accuracy and the convergence speed are still needed to further improve. According to the analysis of...

This paper aims to design a distributed grid simulation system dynamic voltage restorer means to solve the problem of dynamic energy security in case of equipment operating in the electricity voltage sag or interruption. Means the use of "DC - AC" and "AC - DC - AC" dual structure, control system uses...

The research on the function mechanism of service outsourcing industry to economic growth helps to locate the service outsourcing industry accurately during the economic transition from manufacturing to service. In order to obtain the experience path of advanced country’s service outsourcing industry,...

From the theoretical analysis of the primary energy consumption of refrigeration system, energy saving rate and value, combined with the application of specific case, the absorption refrigeration system and the compressor refrigeration system in Combined Cooling, Heating & Power Generation (CCHP) system...

The artistic expression of sports dance plays an important role in the examination of dance art examinees and is one of the vital factors affecting art examinees’ performance. By means of literature method and logic analysis, this paper probes into the factors influencing art examinees’ artistic expression...

Because of the compromise of the security of the underlying system or machine storing the key, exposure of the private key can be an great attack on a cryptosystem. Key insulation is an important method to protect private keys. To deal with the private key exposure problem in attribute-based encryption...

This paper presents a Model-Based approach to develop UAV (Unmanned Aerial Vehicle) autopilot software. It employs Simulink to design the flight controller, Stateflow to implement control logic and Matlab coder to automatically generate embedded C code from the model developed. Software in the loop (SIL)...

The implementation of green hospitality business practices also pays attention to the balance of environmental; economic; and social life. So; maintaining environmentally friendly cultural tourism is important for hotel management. The research objective is to analyze the implementation of green hospitality...

The objective of the study was to describe the concept and implementation of Service-Learning in SMAIT Nur Hidayah of Sukoharjo, Central Java, Indonesia. The research subjects are teachers, activists of extracurricular, students, and society. This research focused on Service-Learning activities held...

The novel coronavirus has posed a threat to human life and safety. Accurately predicting the spread trend of the novel coronavirus and discovering prevention and control measures play an important role in the stable development of the whole human society. The infectious disease dynamics model can predict...

The long-term development of China's economy is inseparable from the labor force, and the birth rate is an important factor to promote China's economic development. This paper uses spatial statistics to analyze the potential social causes of influencing the spatial distribution of birth rates...

An unpleasant encounter can act as a trigger for the development of psychological issues. Bullying among adolescents is on the rise, which increases the risk of psychosocial issues developing in those who are bullied. Bullying victims may experience long-lasting psychosocial issues, such as post-traumatic...

This study aims to determine the analysis of the impact of the Covid-19 pandemic on islamic religious education learning in children with mental retardation, especially movement materials and prayer readings as a result of the transition of online learning to face-to-face learning after the Covid-19...

In today’s China, there are more and more adolescent patients with psychological diseases. The Chinese government has also promulgated many policies to deal with this, and all schools are required to set up professional psychological consultation rooms and be equipped with professional counselors. This...

Purpose/Background/Objectives: Type 2 Diabetes Mellitus (T2DM) is a disease characterized by macro and microvascular complications, particularly, coronary heart disease, cerebrovascular disease and nephropathy [1–4]. The green tea extract has shown an anti-inflammatory effect (2), so this nutraceutical...

Two InGaN/GaN MQWs samples were grown with two different showerhead gap position 13 and 25 mm, using Thoma Swan CCS-MOCVD system, in order to study the effect of showerhead gap position on the growth of InGaN/GaN MQWs. Through the measurement results, we find that the surface morphology, interface quality,...

The value of literary works is largely related to the language of literature. Language is the foundation of literature. Jia Pingwa's Shaanxi Opera and Ruined City are excellent literary works where it is easy to find that a large number of Shaanxi dialect language is interspersed, which has an important...

This paper propose a method to study the dynamic characteristics of two-phase flow though the signals which collected from acoustic emission. With the digital processing to extract the feature of time domain and wavelet energy to analysis. the characteristic of flow. At last, get the relationship of...

With the construction of northern and western wind power base, large-scale regional wind power grid connection begins to affect power system and several power grid accidents in Fuxin grid resulted in partial off-grid in recent years, causing certain damages on the security and stability of power system....

The noise pollution produced by the scraper conveyor affects the working environment seriously. Based on a certain type of the scraper conveyor transmission system as a research object, using the finite element analysis software ANSYS for modal analysis, the results suggested that the natural frequencies...

In Jinghuiqu irrigation area, improper use of groundwater leads to continuous decline of water level. To simulate the water flow in the area, a two-dimensional model of transient flow of groundwater in the area is developed. Use the model to simulate the water field in the area in 2030, the results show...

The operating status of transformers directly affects the safety of entire power grid. Therefore, it is essential to monitor a variety of transformer fault and ensure the normal operation of power grid. The multi-frequency ultrasonic technique was proposed in the thesis and which utilized hundreds of...

Baiyinhua Reservoir is located in Oumulun River, Ar khorchin banner in Inner Mongolia. The irrigation area of design is 53600 mu, and it is a medium-sized reservoir which is given priority to with irrigation. This article gives the stress and deformation distribution during construction and operation...

In order to study the influence of train running parameters to the rescue electric multiple units (EMUs) coupler dynamic performance, a train–coupler system simulation model was established. The influence of different braking level, braking time and braking original speed to the longitudinal force and...

the current college English teaching in China places more value on students’ cognitive factors than on affective ones. It should be noted that comparatively few studies have been done on affective factors in foreign language acquisition. Therefore, this thesis attempts to explore the features of college...

With the rapid development of mobile communication technology and the increasing popularization of smart mobile devices, the mobile Internet era has come, leading to great changes in contemporary university students' life and learning.objective: Basing on Internet+ perspective, studies on counselors...

To overcome the defects of pure integrator initial value of the integral, the cumulative error and DC offset, permanent magnet synchronous motor stator flux observer method is proposed based on full-order state observer. The stator flux as state vector to construct the system state equation, the current...

This paper proposes a new index for evaluating the scientific achievement of individual scientists, based on improving the popular h-index, whilst endeavoring to keep the merits of h-index and remove the demerits. The gist of computation algorithm for the new index is to regard the average times of cites...

Economic and social challenges of the Russian Far East and its industrial centre, Komsomolsk-na-Amur, in particular, make it necessary to rethink traditional approaches to the regional human capital formation. The implementation of modern approaches based on the creation of accelerated economic zone...

The advent of the era of big data has brought severe challenges to traditional business management models, and corporate management will undergo tremendous changes. What are the characteristics of enterprise management in the big data environment compared to the traditional enterprise management model?...

Energy security (ES) has great impact on power grids. Therefore it is important to have power security service (PSS). The PSS should be designed to handle interference and interruption attack in the grid. The interference and interruption attack in the grid is handled by incursion-detection system (IDS)....

The article discusses the problem of moral indifference and its impact on the social system functioning. The emphasis is laid on the transformation of individual relations into public communication. The social causes of this phenomenon in specific historical periods are analyzed. The article also reveals...

Through two surveys before and after, this paper conducts statistics and analyses on the personality elements and teaching elements of excellent Chinese teachers expected by different Chinese language learners. The research results show that the expectations of the learners of different Chinese language...

The human spirit world manifests although has each kind of difference in the culture, but mutually relates, forms the human splendid intangible cultural heritage together. Due to geographical differences, environmental differences and historical differences, the world's national culture showing a hundred...

The satisfaction of ultimate customer can measure with four gross criteria in the supply chain, and can subdivide into ten sub-criteria. Customer satisfaction mainly performs from customer, so there is certain preference as a weight to each criterion. The weight is difficult to focus on one point, but...

In the predictive control, it is often need to obtain the model which prediction accuracy is possible higher, however, in practice controlled objects are often exist nonlinear, parameter variation, model mismatch, disturbance and other factors, there is a big error between the controlled object-based...

Creep tests were carried out on one kind of near alpha titanium alloy named after Ti-600 at 550 , 600 and 650 with the same stress of 300 MPa. The calculated activation energies for the alloy solutioned at and region are 490.1kJ/mol and 473.5 kJ/mol, respectively. Transformed grains become coarsened...

To solve the problem in the original and one-way industry chain of Broadcasting and Television that it is difficult for network operators to communicate with other members in the industry chain, a personalized program recommendation module is proposed as a typical module in broadcasting and television...

The digitalization of the banking sector, which consists of the use of digital tools in banking services, takes banks and other financial institutions to a new level of development. The most important component of digital technologies is intelligent model that reduce the role of people in making various...

In 2020, it seems that the topic of quality of life becomes increasingly important to discuss since the existence of an infectious disease caused by COVID-19 has brought challenging changes in people’s lives. One of the challenges in the pandemic situation is the changing of working system. This study...

Edmodo media is expected to help students learn independently by balancing theoretical and practical learning which is carried out online. Interaction and activeness of students, lecturers or parents is the success key to independent learning. The research objective was to determine the validity and...