In this paper, we investigate the dynamics of an inverted pendulum with two concentrated masses. The perturbation method is used to find the transition curves. We emphasize the difference between the case of two concentrated masses and that of one concentrated mass. Numerical simulations are carried...

The failure characters and damage mechanism of Sn3.0Ag0.5Cu/Cu as-reflowed solder joints under shear thermal cycling were investigated by special shape design for the experiment sample in this paper. The results indicate that fatigue damage mainly occurred within the solder far from the interconnection...

The finite element model of the internal rolling connection process for Titanium alloy tubes was established. The distribution of the elastic strain and the contact force were analyzed to reveal the sealing mechanics of the flareless union. The residual compressive stress was generated between the tube...

With the continuous development and application of information technology, the continuous construction of digital campus and intelligent campus project in colleges, the number of data stored in the college campus environment has increased dramatically, and a big data environment in a college campus has...

The 3/2 unidirectional glass fiber metal laminates were developed using LY12-M aluminum alloy and HS2 high strength glass fiber prepreg by the hot pressing and curing progress. The fatigue crack propagation tests of LY12-M aluminum alloy plates and unidirectional glass fiber reinforced aluminum laminates...

To deal with the signing key exposure problem in fuzzy identity-based encryption systems with AND gates on attributes, we propose a fuzzy identity-based key-insulated encryption scheme with AND gates on attributes (FIBKIE-AGA). Our scheme is provably secure. Our scheme is (N-1,N)- key-insulated and strongly...

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...

To guarantee the OoS of delay-sensitive traffic and improve the routing performance of the aerospace network, the shortest delay routing protocol for delay-sensitive traffic is proposed. Base on the queue information and packet loss probability, the routing protocol can provide the shortest delay path...

To solve the signing key exposure problem in fuzzy identity-based encryption systems with ciphertext policy, we propose a fuzzy identity-based threshold key-insulated encryption scheme with ciphertext policy (FIBTKIE-CP) which is provably secure. Our scheme is key-insulated and strongly key-insulated....

Metal doping carbon aerogels are prepared via polymerization of glutaraldehyde and chitosan with Ni(NO3)2 and Co(NO3)2 doping under freeze - drying method. The as - prepared product are carbonized at 900 °C in a nitrogen atmosphere. The obtained doping carbon aerogels were characterized by means of N2...

In this paper, urban traffic accessibility is regarded as the external manifestation of the dynamic process of the coupling of several traffic systems. Firstly, the relationship between a subway system, a bus rapid transit system, and a common bus system are analyzed, as well as the relationship between...

According to the practical condition of 3401 fully mechanized caving face in Dayang coal mine, the relationship between strata behaviors, mining technology and stope gas emission are analyzed through real-time monitoring of the support working resistance, advance abutment pressure and gas concentration...

Due to the influence of global warming and environmental change, the meteorological and hydrological elements of the Dagu River Basin have also undergone a series of response changes, which have led to the change of the spatial and temporal changes of water resources. The natural ecological environment...

objective: to explore the relationship between air pollution and cerebral vascular diseases contracted among the elderly in towns and villages. Methods: 513 cases of the elderly that contract the cerebral vascular diseases visiting the surrounding township health center of Jilin City during the one year’s...

Hardness forming ions such as Ca2+ and Mg2+ in cooling water tended towards scale on the surface of the heat exchanger, resulting in reduction of heat transfer efficiency. In this paper, by using DSA electrodes, effects of operational conditions on water softening was evaluated by Lab scale experiments....

In this paper, ozone-electromagnetic technique was used to treat papermaking wastewater. It was found that the value of COD, BOD, TOC, SS , AN(Ammonia Nitrogen) and CHR(Chromaticity) of wastewater treated with the specially designed ozone sewage treatment unit decreased from 2660mg/L, 1165mg/L, 1962mg/L,...

In this paper, one carbon dioxide trans-critical refrigeration cycle with vortex tube expansion is proposed to replace traditional expansion valve in order to reduce the irreversible loss of the refrigeration system and improve its COP. The thermodynamic model of carbon dioxide trans-critical refrigeration...

The lubricating oil sludge from steel wire drawing factory contains organic compounds mainly of fatty acids, which has good binding property and combustion performance. In this paper, briquette is prepared from pulverized coal with this industrial sludge as binder. The viscosity of sludge was tested...

The integral steering linkage is the key part on vehicle, which can ensure the Ackerman steer angle when steering. in this paper, The mathematical model of the Ackerman steering linkage is established. The author introduces the optimal design program for the Ackerman steering linkage with MATLAB optimtoolbox....

This paper presents a uniform design methodology for computer aided experimental design for intumescent fire-resistant coating (IFRC) formulations, exemplifies the benefits of using experimental design together with statistical software to facilitate the optimization of fire retardants in a formulation...

In recent years, the global energy supply tends to be tight, the environmental problem causes the widespread concern, the traditional automobile malpractice gradually appears, the government pays more and more attention to the energy saving and emission reduction, has brought the new opportunity to the...

As crude oil is composed of colloidal solution, solid hydrocarbons, asphaltenes, and particulate sediments, in the long-term storage process, hydrocarbon mixtures and impurities in crude oil will gradually settle with gravity to form sludge, and underground crude oil reservoirs will be operated for a...

Closed operation control of section switch and loop switch in distribution network to change the topology structure of the distribution network, thereby changing the distribution of power flows in the distribution network. It can improve the operating efficiency of the distribution network. In addition,...

The MIL-53(Fe)/BiOCl composite catalyst is triumphantly man-made by two-step solvothermal method. The MIL-53(Fe) which possesses nanoscale polyhedral structure is loaded to the surface of BiOCl microspheres. 2,4-DCP is regarded as a simulated pollutant in environmental wastewater, at the same time, H2O2...

The mathematic model of distribution automation terminal configuration optimization is established based on the cost-benefit theory, taking the minimum area as the basic analysis unit, considering the balance of economy and reliability. The number and location of electrical distribu-tion automation terminals...

The waste polyurethane rigid foam was degraded by two-component decrosslinking agent, and a qualified glass fiber reinforced waste polyurethane rigid foam is prepared by compounding the obtained oligomer polyol with a certain percent of glass fibers. The regenerated oligomer polyols were measured for...

In order to study the influence of the nozzle parameters of the rotating jet agitator on the mixing effects, the CFD software is used to simulate the flow field of the bidirectional nozzle of a rotating jet agitator in large crude oil tanks.The mass flow, turbulent kinetic energy and flow velocity are...

The underground oil storage cavern has the advantages of safety, large storage capacity and economical. It is widely used in the national strategic petroleum reserve and various commercial storage. In order to solve the problem of crude oil sludge deposition, this paper based on the principle of jet...

The results of MLA automated quantitative mineralogy system indicated the uranium ore used in this study was mainly composed of pitchblende(1.026), aluminosilicate(include biotite(31.72%), albite(13.98%) and orthoclase(13.43%)), and fluorite(0.94%). The fluoride-resistant bacteria strain could growth...

In this paper, the Moving-Window method based on SCMC is used to calculate the property field of composite materials, and the results are input into the material properties of finite element analysis. By connecting with the finite element analysis program ANSYS, the local stress of non-homogeneous composite...

Microneedles have several applications in beauty and medicine. Many researches are investigating the manufacturing of microneedles on a mass-production scale with relatively low costs, relatively few studies on the mechanical behavior of the microneedle into skin and piercing manner, especially few about...

Microneedles have been made from silicon, glass, and metal. Nowadays, many promising technologies are focused on polymers since they are biodegradable, biocompatible, and easy to fabricate. They can penetrate safely in the body, providing a drug distribution method and eliminating the risk of the needles...

Establishing a mechanism of urban green-space planning and setting up an efficient ecological green-space systems for coping with fragile grassland ecological environment are urgently needed in Inner Mongolia region. This study chose Kangbashi as a research object to set to study as follows: identifying...

To bridge the gap between undergraduate electrical engineering curriculum and the modernizing electric power grid, Smart Home Testbed projects are ideal for undergraduate student design and research programs. Observed the fact that Smart Home Testbed projects are small-scale and short-term, a three-layer...

To analyze the effectiveness of pollutant cap control mode towards pollutant reduction and the improvement of water quality in the section, this paper took the Huangshui River Watershed as an example, with main pollutants COD and NH3-N as the main indicators. And established a water quality model based...

In this paper, based on the 190 monitored city data released by the China National Environmental Monitoring Center in 2018, the optimal scale and factor analysis methods were selected to conduct in-depth research and analysis of urban air quality. The study found that: PM2.5 has a serious impact on air...

A conventional muffler of internal combustion engine is mostly constructed as a mixture or combination of perforated ducts, baffle or perforated baffle, expansion chamber, etc., and the noise reduction is limited and backpressure is high hence the fuel efficiency is low. In order to solve the problems...

as an important form of petroleum reserve, underground water seal cavern has the advantages of safety and low environmental protection cost. So water sealed underground structure of the site selection is a vital step, this article through to the domestic and foreign water seal the location of the underground...

Aluminum has an important position in the economic development of all countries in the world, especially industrial developed countries. Widely used in many sectors of economic and social development. In 2016, the consumption structure of China's aluminum sector is: 35% of buildings, 19% of transportation,...

This study evaluated the bioavailability of lignite from Shanxi Province (China) via using domestic anaerobic sludge as the source of exogenous flora. After pretreatment of lignite with hydrogen peroxide at different concentrations, the levels of soluble organic carbon and organic acid were increased...

The principle and characteristics of electrostatic desalination technology has been introduced, a small electrostatic desalination equipment has been made by myself with 10 electrode plates, and the spacing between two plates is 10 mm. The desalination of the equipment is better when the DC voltage of...

CO2 flooding technology and sequestration is one of the main ways to avoid global warming. The existing research both at home and abroad and the experimental results show that as an oil displacement agent,the CO2 injected in the reservoir can greatly improve the recovery efficiency of oil and gas. At...

The study investigated the effect of coagulant dosage, flocculation time, and precipitation time on the turbidity removal rate of Oxidized Poly-silicic-ferric (OPSF) coagulant compared with the polyferric aluminum (PFA) coagulant. The effect of OPSF on coagulation and filtration under short-time coagulation...

Seven-year-old tree of Ziziphus jujuba ‘Zhanshanmizao’ cultivated in field were used to study the degree dormancy, chilling requirement (CR) and dormant physiological indexes such as the content of water, carbohydrates, free amino acid, and soluble protein. The results showed that the Z. jujuba ‘Zhanshanmizao’...

The hydraulic steering gear is an important equipment of the ship and its failure could contribute to navigation unsafely. With regard to the failure of a certain hydraulic steering gear and inspection of the steering mechanism, this article specifies reasons for the failure of the steering gear and...

In order to solve the problem of high fruit drop rate of Zizyphus Jujuba ‘Zhanshanmizao’, this experiment used Z. Jujuba ‘Zhanshanmizao’ as material, throught measuring the fruit drop rate and organic nutrient changes with different tree vigor, to study the dynamic change and drop mechanism of fruit...

In order to explore the effect of covering on the natural dormancy of jujube, 7-year-old Ziziphus jujuba ‘Zhanshanmizao’ was used to study physiological index such as the content of water, Carbohydrate, soluble protein and free amino acid by different shed time (December 5 th, 2016, December 25 th, 2016,...

This experiment studied the effects of different concentrations of gibberellius (GA3), naphthalene acetic acid (NAA), and 4-chlorophenoxyacetic acid (PCPA) on the fruit drop rate and quality of Ziziphus jujuba ‘Zhanshanmizao’. The results showed that spraying NAA reduced the fruit drop rate of Z. jujuba...

Seven-year-old tree of Ziziphus jujuba ‘Zhanshanmizao’ cultivated in field were used to study the breaking dormancy and the dynamic changes of antioxidants (superoxide dismutase, peroxidase, O2-•, and malonyldialdehyde) in jujube shoots under different concentrations (2 mmol/L, 4 mmol/L, and 6 mmol/L)...

The 7-year-old Ziziphus jujuba ‘Zhanshanmizao’ as experimental material was used to measure the water content and organic nutrients (starch, soluble sugar, soluble protein, and free amino acid) in jujube branches and analyze the fruit quality after spraying jujube trees with different concentrations...

Energy consumption structure and industrial structure are important factors affecting energy efficiency. China's energy consumption structure and industrial structure have not achieved positive interaction, but are mutual obstruction, non-coordination and low synergy. This paper studies the theory of...

It takes Zizyphus jujuba 'Zhanshanpinguozao' as the test material. Changes of Ascorbic Acid content in four stages (young leaves, spreading leaves, mature leaves, senescent leaves) of jujube leaf development, jujube flowers and five periods of fruit development (Young fruit period, green mature period,...

The experimental material is ‘Red Globe’ grape that is taking shelter from rain. Use different concentrations of SUNRED on the grapes, when the color of grape is turning. Then study the effect of color and quality of fruit. The results show that, SUNRED 1000 times could promote the grape coloring. The...

To reduce the permeability of clay liner, and make it has anti-cracking performance. Permeability and anti-cracking properties were studied on different Silica fume added to clay liner. 0、10%、15%、20%、15%、30% of the clay is replaced by silica fume at optimum water contents. It is shown by test results...

The sewage sludge and banana peel are typical solid wastes. In this paper, sewage sludge and banana peel blends were used as raw materials for the preparation of mixed waste biological carbon. Adsorption performance of Cu2+ and Pb2+ at different raw material ratios were investigated. The results showed...

A composite fruit peel (HFP) coagulant was prepared from banana peel and orange peel, for humic acid simulated water , the effect of dosage and pH on the turbidity and color removal rates were investigated. The results showed that the HFP has 97.14% turbidity removal and 88.7% of color removal under...

In light of urgent need of approval of ballast water management system against the new G8 guidelines, organism regrowth within treated ballast water should be assessed. However, it’s the first time for mandatory demands on the evaluation of organism regrowth in ballast water. For the existances of DNA...

In recent years, with the increasing share of shipping volume in total international trade volume, the carbon emission of ships has increased year by year, and the carbon emission of ships has been paid more and more attention. This article is based on CO2 emissions, or tce, vessel operating efficiency...

An efficient extraction and purification technique based on ultrasonic microwave-assisted extraction (UMAE) method was established to obtain phenolics-enriched fraction from jackfruit by-products (JPEF). Optimisation of the extraction parameters for maximum extraction yield of JPEF was carried out using...

In this paper, numerical simulation was made to analyze and optimize the important factors of CdS/p-Si heterojunction solar cell, which include work function of TCO layers and back surface field (BSF), thickness of CdS thin film and silicon substrate. The results of simulation indicated that the TCO...

Aimed at the distinguishing features, namely, high salinity, high pH value, unstable water quality and quantity, of the subsiding water from cropland in the Yellow River irrigation area of Ningxia, static adsorption experiments were carried out to remove ammonium nitrogen from the aqueous solution by...

Green development is an inevitable requirement for Traffic Development Strategy. The deep integration of Transportation Network(TN) and New Energy Network(NEN) would become the main trend in the future. This article focused on the analysis of the integration development of Road Network, Water Transportation...

In order to discuss the effects of applying different proportions of potassium sulfate on grape fruit quality, 10 different potassium sulfate proportions were applied. The result was that the treatment 6 had the best effect, and both the intrinsic and the external quality of the fruit were improved,...

In order to explore how large bulk carriers can reduce the operational energy efficiency index of ships and improve the operational efficiency of ships, in order to respond to the increasingly stringent emission regulations put forward by IMO and reduce the EEOI value of ships. 7,000 tons of Panamax...

Rural domestic sewage is an important cause of water pollution in Dianchi. Accurately grasping the spatial distribution of sewage is the basic condition for harnessing Dianchi's water pollution. By collecting water samples from various parts of the Dianchi River Basin and conducting laboratory tests,...

The development of the power grid makes the X/R value in the network become more and more large, which leads to the attenuation of the short-circuit current DC component becoming more and more slow when the fault occurs. In this situation, the ability of the breaker to break the short-circuit current...

DTH hammer drilling in rock fragmentation has been widely used, but there is still a lack of effective computer-aided design tools. In this study, the dynamic analysis and parameter matching simulation system for down-the-hole hammer was developed. The dynamic process of down-the-hole drilling was elaborated,...

In this research, a new type of roof cultivation substrate with different ratios of six kinds of substrate products and inorganic substrates was laid in a self-made roof model with a thickness of 7.5 cm and 15 cm, and the substrate was sprayed to record the matrix flow production time, the amount of...

Under the background of energy shortage and environmental pollution, the development and utilization of building water energy and resource utilization have actively responded to the construction of the national sponge city and are in line with the sustainable development strategy. It can not only solve...

Micro-grid is a new technology approach for the distribution of distributed power generation systems into distribution systems. It can effectively integrate renewable energy (solar energy, wind energy, etc.), energy storage and loads. The issue of optimizing the capacity of the micro-grid is a very important...

With parameter values chosen to obtain good calculate, the experimental results show that the load will receive the maximum voltage and maximum electric power at resonant frequent 22kHz when Tesla coils are 4mm away. The maximum electric power transfered by two Tesla coils of diameter 30mm with 13 loops...

Through studying how to affect acoustic directivity with MATLAB software, it show that selection of a relatively larger surface of the transducer and a relatively closer transducer interval will be more preferable for directivity. While an array which possess more array element number and whose frequency...

The studied results of correlation dimension of spatial patterns of population distribution of L. regale by box-counting dimension show that: 1) in most sample plots the fractal properties of box-counting dimension are significant; 2) in most sample plots the box-counting dimension is small, indicating...

According to the characteristics of Raman fiber signal, combined with the advantages of wavelet threshold denoising and empirical mode method, the two methods are combined for removing noise. This method improves the signal-to-noise ratio by 15% in simulation experiments. This will get more accurate...

To assessment the sustainability of resource-based city development from the perspective of ecology, this paper evaluates the sustainable development level and ecological security of HanCheng City with combined method of ecological footprint and the sustainable development index. The results show that...

A new copper(I) complex of [Cu(Flu-im-Py)(POP)]PF6 supported by Flu-im-Py =5-(9H-fluoren-2-yl)-2-(1H-imidazol-2-yl)pyridine, POP=bis(2-diphenylphosphanyl)ether, was synthesized and characterized. The corresponding photophysical properties were investigated using UV-vis and emission spectrometry. The...

A four-coordinate copper(I) complex containing N-heterocyclic carbene (NHC) ligand and bis([2-diphenylphosphino]-phenyl)ether) (POP) ligand were successfully reported and characterized. The corresponding photophysical properties were investigated using UV-vis and emission spectrometry. The lowest-energy...

The processing of blueberry pulp has great significance on its quality and nutrient. In this experiment, based on the optimized hot dipping method, we compared the nutrient of blueberry pulps adding two food flavor additives, citric acid and cocktails. The blueberry fruits of verity ‘O’Neal’ with different...

This thesis takes the virtual power plant theory as the research background, designs and builds the dispatch management system based on the virtual power plant.The dissertation completed the software and hardware design of FPGA-based power monitoring device and realized the wireless transmission function...

Three-year-old ‘summer black’ grapes were used for trial material to study the effects of spraying with the different concentrations of calcium fertilizer on grape fruit external quality and intrinsic quality. Fruits were sprayed 1000，1200，1400 times amino acids chelate calcium during the fruit color-changed...

Three-year-old ‘ruby seedless’ grapes were used for trial material to study the effects of spraying with the different concentrations of calcium fertilizer on grape fruit external quality and intrinsic quality. Fruits were sprayed 0.1%, 0.2%, 0.3% Calcium nitrate solution during the fruit color-changed...

In order to detect the performance of SCR denitration catalyst activity online, and optimize the AIG spray distribution automatically, an innovative system is proposed. The system could monitor the NOx concentration distributions of SCR inlet and outlet flues simultaneously. According to the distributions...

Blueberry is a kind of economic fruit with high nutritional value, good economic benefit and broad market prospect. In this experiment, the growth of 15 blueberry varieties/strains in Qionglai in Chengdu city was investigated. The results showed that the growth rate of ‘Brigitta’ and ‘NBS2’ was the best,...

Thermal pyrolysis of city life garbage gas is an effective means to achieve waste reduction, harmless treatment and resource utilization. However, the particles in the fuel gas has a detrimental effect on its recycling. It must be purified before recycling. The waste gasification gas purification process...

Urban color design is a concern of many cities in China in recent years. Since the 1980s, Chinese cities have generally lacked of aesthetic cultivation and attention to the urban color in the process of rapid development. The colors of various new materials and coatings, the random posting of urban advertisements...

In order to study the effect of the number of grape fruit retained on the fruit quality of fruit, different degree of fruit thinning were carried out (keep 80, 90, 100, and 110 grapes) on the ‘Summer Black’ grape, and the fruit quality was analyzed. 100 grapes per bunch was the most significant for improving...

The water system of Suzhou ancient city is vertical and horizontal. There are many water networks composed of large and small rivers, which have the functions of production, life and landscape. Taking the landscape water body of Suzhou ancient city as the research object, the national standard analysis...

Based on the combination of typical research and literature, this paper analyzes the current situation of agricultural and rural environmental pollution in Jiangsu Province in the past decade and the causes of environmental pollution in agricultural and rural areas of this province. Then it puts forward...

Ultrasonic cross-hole detection method is widely used for the quality detection of bored piles due to its comprehensive, detailed and accurate results, and no restrictions on the lengths and ratios of length to diameter of piles. However, because of the quality problems of the instrument or operation...

This paper presents the cause analysis, treatment plans and treatment results of a settlement deformation accident at tunnel portal area of left line T1 tunnel in Algeria North-South Expressway. The engineering practice demonstrated the feasibility, timeliness, and safety of the treatment plans. The...

Car travel characteristics is one of the important factors affecting of the urban road network operation. To provide support for traffic refinement management and policy making, collecting car travel data and having in depth analysis of its travel behavior characteristics, is the key aspect in encouraging...

Mined-Out Area Saturated by Water is a serious threat to the safety coal-mining practices. This research focuses on detecting mined-out area saturated by water with transient electromagnetic method. Data acquisition system was arranged along 65 survey lines, and the total of 4830 survey points were recorded....

In this paper, using artificial controlled pot experiment to treat Sonchus arvensis L. with different concentrations of cadmium (Cd), the tolerance of Cd in S. arvensis was studied, and the results showed that with the increase of Cd concentration, biomass rises first and then falls, the chlorophyll...

The quantitative determination method of seven organic phosphate esters (OPEs) in urine by gas chromatography-mass spectrometry was established and optimized by changing the derivative reaction procedure, the different sample doses and the different extraction reagents. The results showed that the best...

Pollution controlling’s incentive and monitoring are important issues in environmental management. However, in the mechanism of pollution controlling, the importance of pollution controlling indexes determine the selection of controlling order and efficiency of pollution controlling, management authorities,...

A pot experiments were conducted to study the effects of water stress on plant Blade retention, leaf relative moisture content (LRWC), Morphology and growth status, five drought-resistant plants (Pyracantha angustifolia, Pyracantha fortuneana, Pyracantha fortuneana ‘Harlequin’, Ligustrum japonicum ‘Howardii’,...

With the continuous development of the economy, the requirements for glyphosate production and environmental protection policies published by the country are becoming stricter. The glyphosate waste liquid has high viscosity and low calorific value, and the conventional waste liquid is difficult to burn....

The trapping effect of eight different kinds sticky traps on adult Cotarina sp. were studied in different suspension heights to provide the basis for monitoring and integrated controlling. The results showed that the suspension height and the color of the sticky traps had significant impacts (P

A pot experiment was conducted to study the accumulation characteristics of cadmium (Cd) in Cyphomandra betacea Seedlings. The annual C. betacea seedlings were treated with Cd of different concentration gradients (0 - 20 mg/kg). The results showed that with the increase of soil Cd concentration, the...

A pot experiment was conducted to study the effects of cadmium (Cd) stress on photosynthetic characteristics of Cyphomandra betace seedlings. The annual C. betacea seedlings were treated with Cd of different concentration gradients (0 - 20 mg/kg). The results showed that with the increase of soil Cd...