Search

Improving steam parameters in a coal-fired power unit boosts cycle efficiency, lowers coal consumption, and reduces emissions. The backpressure extraction steam turbine (BEST) cycle addresses the problem of excessive superheating of extraction steam. This study analyzed a 1000 MW double reheating unit, finding that heat rate in the conventional and BEST cycle systems is heavily influenced by load under THA conditions. At 100% and 75% loads, the BEST cycle’s heat rate decreases but increases at 50% load. For safe operation during flow interruption and high load rates, a pairwise grouping method is recommended for high-pressure heater interruption. When multiple low-pressure heaters are simultaneously cut off, the unit load needs to be limited based on the number of heaters being removed. when multiple low-pressure heaters are simultaneously cut off, the unit load needs to be limited based on the number of heaters being removed. Removing two low-pressure heaters lowers the load to 90%, and three lowers it to 80%. These findings optimize the thermal system’s parameters and enhance overall efficiency.

The capacity construction project group of Changqing oilfield needs to repeatedly enter the same data into multiple different information systems of the company every day. This work mode causes many problems, such as multiple entries, heavy repetitive workload, and difficult to guarantee data quality. Through in-depth analysis of business process and data entry status of the capacity construction project group, this paper puts forward the working ideas of data collection link standardization and data collection standard standardization, explores and establishes a standardized data collection system for the whole chain of capacity construction report data, including investment plan, well information entry, investment allocation, predrilling, drilling, well log, logging, oil testing (gas testing), production and injection, and well delivery. The system guarantees the timeliness, integrity and accuracy of data. In addition, it provides an external data sharing service, build the capacity construction data sharing platform, and realize the “one-time data entry, multiple system reuse, automatic report generation” of capacity construction report data.

Solar interfacial evaporation represents a promising and sustainable solution for desalination. Despite its potential for high evaporation rates, the coexistence of vapor and incident light has hindered efficient freshwater collection. In this work, we propose a vapor-down harvesting reverse solar distiller (RSD) that comprises a photothermal layer, a supply water path, and a condensation chamber. Unlike conventional solar stills, the RSD enables water evaporation and photothermal conversion to occur on opposite sides, preventing mutual interference between the vapor and incident light. Furthermore, the RSD exhibits superior performance in terms of salt resistance and condensation. Remarkably, our RSD achieves a high freshwater collection rate of 1.03 kg m-2 h-1 with an impressive collection efficiency of 71%.

Logging technology is the key technology used in modern petroleum resources exploitation. Reasonable application of logging technology is conducive to efficient exploitation of petroleum resources. Therefore, the application of logging technology in oil exploitation has always been the key research target of oil well exploitation technology. This paper discusses the function of logging technology in geological steering of horizontal well. This paper discusses the logging technology and the geological steering work of horizontal well, discusses the specific application and due function of the logging technology. In the process of discussion, in order to ensure the practical research of this paper, a good application process of the logging technology in the drilling geological steering of a horizontal well is put forward.

Tomato is the main planting variety of facility cultivated vegetables in Luanzhou City. In order to continuously optimize the appropriate amount of tomato nitrogen fertilizer, different total amount control tests of nitrogen fertilizer are set on tomato crops to explore the optimal amount of tomato nitrogen fertilizer in this region and provide a theoretical basis for greenhouse tomato production in the future.

The economic fallout from COVID-19 pandemic changes individuals’ investment perceptions and behaviors in a tremendous way. Consequently, investment decision-making has been affected as people have to adjust to the new environment. This study aims to study whether COVID-19 really make people risk aversion due to the economic slowdown. Our empirical results are analyzed from household finance data in U.S in July 2021. It is found that COVID-19 proximity, income, and occupation are positively associate with risking taking in investment decision-making, while age and family size are not. This study contributes to the newly emerged body of knowledge on post pandemic investment decision-making and risk behavior analysis and provide implications for financial investment institutions.

Healthy living space is the guarantee of high quality of life, dong Village is one of the few minority living space environment adaptation wisdom of the living carrier. By virtue of its healthy ecosystem and the smart wisdom of residents, it is connected with or adapted to the natural environment to create a healthy and livable living space under low-technology conditions. Taking The Gaoxiu Dong Village as the research object, this paper analyzes the environmental adaptation wisdom of the spatial elements such as road system, drum tower space and residential building in Gaoxiu Dong Village, so as to show the spatial form beauty, functional practical beauty and national characteristic beauty of Dong Village. From the perspective of health, it analyzes the adaptive form and mode of human living space, and inherits the wisdom of building with respect to nature and environment.

With the continuous development of Internet technology, more and more fields are beginning to use Internet technology to improve their business construction. Moreover, in terms of e-government construction, introducing the Internet technology into e-government work at all levels is also an important content, and the Party Central Committee has proposed a series of major decisions such as network power and “Internet +” to accelerate the process of e-government informatization. Meanwhile, big data virtualization technology and access control technology are used to break through e-government data sharing barriers to realize virtual integration and trusted sharing across e-government data and support multi-departmental, crosslevel, and cross-network data security interactive processing for e-government business collaboration. Besides, the multi-source circulation and on-demand access of cross-departmental e-government data are realized to break data barriers, form data transmission links, and create a model for exchanging and sharing e-government data. Through the exchange and sharing of e-government data, the barrier-free flow of information can be achieved and the efficiency of e-government business handling can be improved as well.

In water conservancy and transportation engineering, self-healing cement has been widely used. This paper researches the optimal water-cement ratio of self-healing cement mortar to obtain the best basic performance, and on this basis, researches the occasional effect of self-healing agent and fibers on the mechanical properties of cement mortar. In addition, the research on the shrinkage characteristics and impermeability of cement mortar by self-healing agent was carried out to provide the basis for the curing methods of bacterial cement in the project. Finally, the microstructure of self-healing cement provides a theoretical basis for the macroscopic performance. The results show that the best water-cement ratio of the self-healing cement mortar is 0.42, and the fiber can effectively improve the toughness of the material. In addition, bacterial can increase the auto-shrinkage and impermeability of cement. These results will offer valuable experience for experimenters to assist the experiment work.

The LiV3O8 nanoplates cathode materials was prepared by polyacrylamide-assisted freeze drying method. The annealing temperature affected the agrochemical properties of the LiV3O8 nanosheets cathode materials. The LiV3O8 nanoplates cathode materials were characterized by XRD, XPS, SEM, TEM, and galvanization charge/discharge profile measurement. The LiV3O8 fabricated at 550 °C (LVO550) showed the highest discharge capacity, best agrochemical performance, and high rate capability (after 100th, a reversible discharge capacity up to 223.8 mAh g−1). Benefiting from two dimensional nanoplates structure can provided a larger surface area, shorter lithium ion diffusion path, and maintain stable structure, the LiV3O8 nanoplates exhibited excellent rate capability, high reversible capacity and high temperature properties.

The MnV2O6 nanorods anode materials was prepared by a simple hydrothermal method, MnCl2·2H2O and NH4VO3 as raw stuffs. The MnV2O6 nanorods anode materials were tested by SEM, XRD, and galvanostatic charge/discharge profile measurement. Time-dependent experiments were designed to examine the morphology evolution of the MnV2O6 nanorods anode materials. As an anode material, the MnV2O6 nanorods showed the good discharge capacity (403 mAh g−1 of 100th). The good electrochemical performance can be attributed to the synergistic effect with Mn and V elements, and fast lithium ion diffusion of the 1D nanorods structure.

In this paper, the influence of mutual opposition error between the standard secondary line at the end of the test bench and the tested secondary line in the error test of voltage transformer is analyzed, and the corresponding solutions are proposed for the wrong wiring.

The mechanical performance of the cable is directly related to the electrical performance of the cable, and even affects the safety, reliability and durability of the whole charging process. Electric vehicle charging cable is different from the traditional wire and cable, which has higher requirements for the mechanical properties of the cable. In this paper, the tension test is carried out on the insulation or sheath of the cable. By observing the phenomenon of "slipping" and "end breaking" in the process of the test, the structure of the flat push collet is optimized. It can be seen from the comparative test analysis that the improved chuck mechanism has a great effect on improving the test accuracy and reliability

Establishing a theoretical model for Ocean Wave Energy Convertor in advance is a necessary step during studying the energy harvesting of ocean wave which can save the engineering cost and improve research efficiency. Since low energy conversion efficiency existed in wave energy convertor when capturing ocean wave energy, the mechanism of slotless Halbach linear generator which can optimize the magnetic field distribution of the generator is adopted as the secondary energy conversion devices to solve the problem. The magnetic vector potential theory is introduced to analysis the topology of Halbach linear generator, then expressions of the generator’s performance have been deduced. Hence, the analysis model of the Halbach linear generator has been settled. To obtain the global optimal solution, the simulated annealing algorithm has been used to slove that derived model. Then a series of linear generator’s design parameters are fixed, which include dimensions of permanent magnets and winding coils. The error of linear generator’s peak power between analytical solution results and simulation results is about 3.6%. The experiment result demonstrates that maximum output power of optimized Halbach linear generator reaches 570w.

Graphene is a new type of carbon material with excellent performance. It not only has good electrical, mechanical and thermal properties, but also can be used as a filler of natural latex materials to optimize the thermal conductivity of natural latex materials. Therefore, graphene is widely used in aviation, automobile, machinery and other fields. In order to study the influence of the coordination ratio of graphene and rubber materials on the thermal conductivity, the natural rubber latex was first diluted and dissolved with volatile organic solvent toluene; then 0g, 0.5g, 1g, 1.5g, 2g, and graphene were respectively mixed into 20g natural rubber latex to prepare 6 thin samples (type I, type II, type III, type IV, type V, type VI). Finally, the thermal conductivity of 6 samples was measured by fla laser thermal conductivity instrument. The results showed that with the increase of graphene dosage, the thermal conductivity of natural rubber latex sheet increased significantly; when the ratio of graphene dosage to natural rubber latex was about 1:10, the rate of improving thermal conductivity of natural rubber latex decreased.

During the ultrasonic cleaning of the connecting rod, the liquid level should be constantly changed to minimize the impact of the cleaning blind area. Dealing with the level requirement of connecting rod ultrasonic cleaning，this paper uses the controller based on fuzzy algorithm to control the level. The design of control system including Analysis of liquid level system，fuzzy variables, the controlling rule and control polling list. The controller outputs the actual variable and then operates the solenoid valve to change the liquid level. The response curve of level control system in ultrasonic cleaning is obtained through simulation. The test result of Matlab simulation indicate how fast the system is on responsing,and the design meets the requirements.

With the deepening of the reform of power enterprises, it is imperative for the maintenance of power equipment to be replaced by conditional maintenance. Therefore, combining the advantages of the expert system and the comprehensive analysis technology of multiple fault diagnosis algorithms, an intelligent power equipment condition maintenance system is designed. The system is mainly composed of modules such as data management, status evaluation, risk assessment, fault diagnosis, monitoring and early warning, and decision-making suggestions. Each module is independent and interconnected. Secondly, combined with the information collected by the Internet of Things to determine the maintenance plan, and then introduced the application of the Internet of Things technology in the full cycle management of power equipment, and finally compared and analysed the status maintenance and general maintenance based on the Internet of Things technology.

This paper designs a system platform for graphical programming. The system is based on the open source software platform developed for the second time, which can realize the layer-by-layer conversion of diagrams and source codes, allowing users to deeply understand the logical relationship of programming, and programming and the host can be downloaded. The user can complete the drag-and-drop procedure, the icon shows the basic elements of the function, and the attribute box can modify each variable and automatically build it. After the user builds a graphics program with this system, click the run button to generate Python code and save the project.

A 4D seismic forward model constitutes the foundation of 4D seismic inversion. Here, in combination with the Gassmann equation, the Digby model is improved to calculate the S-wave velocity, and the resulting equation is verified using rock testing results. Then, considering the influences of changes in the pore pressure, CO2 saturation and porosity on the P- and S- wave velocities, rock testing results from a CO2 injection area in the Weyburn field are used to calculate the P- and S-wave velocities of the reservoir. These P- and S-wave velocities are found to overlap under different pressure conditions with or without considering porosity variations. Therefore, two-layer models and well models are developed to simulate synthetic seismograms; the models considering porosity variations may provide greater seismic responses and different Amplitude Versus Offset (AVO) trends in the synthetic seismogram profiles than those without considering porosity variations. Thus, porosity variations must be considered when establishing 4D seismic forward models.

With the development of economic globalization, the bank market has become increasingly competitive. The bank must take measure to attract more customers, change market status and maximize the profit. Take some bank as an example, the active transformations are increasing deposit rate and decreasing loan rate. In this paper, conductive transformation is used to analyze bank customers' action changes induced by active transformations. With conductive degree, the influence of bank behavior on customer behavior can be seen. With independent degree, we can see which behavior changes can affect bank profit, and how active transformations influent bank market status.

After 50 years of exploitation, Block A has entered the development stage of the ultra-high water cut stage. Although the layer series of development has been subdivided and adjusted, the interlayer interference is still serious, imposing difficulties in development adjustment. Based on dynamic production data and monitoring data analysis, this paper applies multi-disciplinary reservoir description technology and introduces economic evaluation indicators to quantitatively analyze the variation coefficient of permeability within subdivided layer sections, the number of monolayer breakthrough series and sections, the number of small layers within a layer section, and the effect of sandstone thickness on the subdivision and adjustment effect, analyze the influence of well test period and operation costs on the economic benefits, and the optimize combined parameters of subdivision water injection layer sections. After field application, the utilization proportion of sandstone in the soil layer with the subdivided well permeability of less than 0.1 μ m2 increased by 18.3 percentage points, and the average daily oil output per well in the surrounding wells increased by 0.3 t, effectively reducing the decline in output and increase in the water cut, and providing technical support for water flood fine potential tapping in the ultra-high water cut stage.

Abstract Four missense substitutions (T30N, G52S, V199I and R200Q) in the porcine PRKAG3 gene were considered as the likely candidate loci affecting meat quality. In this study, the R200Q substitution was investigated in a sample of 62 individuals from Hampshire, Chinese Min and Erhualian pigs, and the genetic variations of T30N, G52S and V199I substitutions were detected in 1505 individuals from 21 Chinese indigenous breeds, 5 Western commercial pig breeds, and the wild pig. Allele 200R was fixed in Chinese Min and Erhualian pigs. Haplotypes II-QQ and IV-QQ were not observed in the Hampshire population, supporting the hypothesis that allele 200Q is tightly linked with allele 199V. Significant differences in allele frequencies of the three substitutions (T30N, G52S and V199I) between Chinese indigenous pigs and Western commercial pigs were observed. Obvious high frequencies of the "favorable" alleles 30T and 52G in terms of meat quality were detected in Chinese indigenous pigs, which are well known for high meat quality. However, the frequency of the "favorable" allele 199I, which was reported to have a greater effect on meat quality in comparison with 30T and 52G, was very low in all of the Chinese indigenous pigs except for the Min pig. The reasons accounting for this discrepancy remain to be addressed. The presence of the three substitutions in purebred Chinese Tibetan pigs indicates that the three substitutions were ancestral mutations. A novel A/G substitution at position 51 in exon 1 was identified. The results suggest that further studies are required to investigate the associations of these substitutions in the PRKAG3 gene with meat quality of Chinese indigenous pigs, and to uncover other polymorphisms in the PRKAG3 gene with potential effects on meat quality in Chinese indigenous pigs.

A framework of non-intrusive polynomial chaos expansion method (PC) was proposed to investigate the statistic characteristics of the response of structural-acoustic system containing random uncertainty. The PC method does not need to reformulate model equations, and the statistics of the response can be evaluated directly. The results show that compared to the direct Monte Carlo method (MCM) based on the original numerical model, the PC method is effective and more efficient.

Purpose: This study aims to discuss the treatment effect of hearing aids on tinnitus. Methods Send questionnaires to 48 cases of bilateral prolonged tinnitus patients with course of more than 1 year to evaluate the subjective perception state of the tinnitus after 24 months. At the same time, follow up 10 cases of bilateral prolonged tinnitus patients without receiving the treatment of hearing aids and use them as the contrast group. Results: Through the treatment of 24 months, the treatment effects on tinnitus are as follows: 23 cases were cured (47.92%), 14 patients were improved significantly (29.17%), 6 cases were improved (12.5%), and 6 cases were invalid (12.5%). The overall effective rate was 87.5%.Conclusion: The hearing aids have treatment effect on the bilateral prolonged tinnitus patients in China.

Purpose: This study is used to explore the method for repairing nasal soft tissue defects with paramedian forehead skin flap with base at the supraorbital artery region and its curative effect. Method: Retrospective case study. Clinical data of one case of a patient with defects of most nasal soft tissue in China–Japan Union Hospital of Jilin University were used. The forehead flap with base at the supraobital artery will be transferred to nasal soft tissue defects so as to repair the nose of the patient. Result: All forehead flaps with the blood supplied by supraobital artery of one patient case all survived. The blood supply of the flap is stable because quality, color and luster are all similar with those of the nose. No bleeding, flap hypertrophy or overstaffed pedicle appeared after the operation. They all healed up in Phase I. Conclusion: Paramedian forehead skin flap with base at the supraorbital artery region is an ideal flap supply for repairing most nasal soft tissue defects.

Purpose: This study aims to discuss clinical manifestations of non-allergic rhinitis (non-allergic rhinitis, NAR) children patients aged 15 years old or younger and their inducement, comorbid diseases, family medical history and quality of life and to analyze clinical characteristics of children of different age groups so as to provide clinical evidence for the improvement of NAR children patients’ comprehensive diagnosis and treatment. Method: Questionnaires were issued to 74 children patients diagnosed with NAR between June, 2014 and June, 2015 and all of them had the specialized examination of nasal cavity. The standardized 100-point visual analogue scale (VAS) was used as the symptoms survey scale to evaluate the severity of symptoms. Those patients surveyed were divided into two groups: Group A of preschool children under 6 years old and Group B of school-age children under 15 years old. Lateral comparison was done for severity of symptoms of single sample so as to reduce the subjective factors. After that, symptom characteristics of both groups were compared and SPSS 13.0 was also used to finish the statistical analysis. Results: The occurrence rate of sneezing, nasal mucus, nasal obstruction and nasal blockage of NAR children patients was 86.49%, 84.60%, 91.20% and 73.65% respectively. The most serious symptom of children of Group A was nasal obstruction and its occurrence rate was higher than that of Group B. The difference had statistical significance (x2=19.194, P0.05). The most serious symptom of children of Group B was nasal mucus and its occurrence rate was higher than that of Group A. The difference had statistical significance (x2=16.92, P

Background Hyperreative rhinitis (HRR) is identified as rhinitis which has at least two symptoms such as sneeze, itches, watery secretion and nasal blockage. Little is known about the pathology of HRR, as well as its clinical features and treatment. Objective To investigate efficacy HRR by combined therapy with intranasal steroids and antihistamines Methods The age, gender, predisposing factors and clinical symptoms of 200 HRR patients were analyzed. Both intranasal steroids and antihistamines were applied for 8 weeks. Symptoms were assessed with VAS score before and after the treatment. Result: Before the therapy, 87% of HRR patients showed persistent symptoms; 69% complained about severe and persistent effects on the quality on the life; sneezing (96%) and rhinorrhea (78%) were the top 2 symptoms reported; All patients completed the 8-wk combined therapy with intranasal steroids and antihistamines; 96% patients were satisfied with the therapy, with all symptoms except wheezing have been clear relief (p

Introducing fine precipitates is an important way to enhance the properties of transformation-induced plasticity (TRIP) steels. In present work, two V-Ti microalloyed TRIP steels containing aluminum with different content were compared. The average size, size distribution and numbers of vanadium-titanium carbides in samples cold rolled, quenched after being held at 800°C and quenched after intercritical annealing at 800°C and being held at bainitic isothermal transformation temperature of 400°C were investigated by using the technique of carbon extraction replica, twin jet chemical polishing thinning and transmission electron microscopy. The carbides were identified to be (Ti,V)C precipitates in steel A and VC in steel B respectively, precipitated mainly from ferrites grains. The average equivalent radius was 3~6nm. Comparison of the experimental results in A and B steel revealed low carbon diffusion rate caused by aluminum inhibited the coarsening of vanadium-titanium carbides. The experimental results also showed that VC carbides dissolution occurred during the intercritical annealing at 800°C.

Testing the method of speckle pattern processing based on the digital image correlation is carried out in the current work. Three the most widely used formulas of the correlation coefficient are tested. To determine the accuracy of the speckle pattern processing, test speckle patterns with known displacement are used. The optimal size of a speckle pattern template used for determination of correlation and corresponding the speckle pattern displacement is also considered in the work.

The article presents the impact of the laser radiation divergence and the wavelength on the harmonic distortion detection, as well as the influence of the distance between the optical circuit elements on the harmonic distortion and the sensitivity of amplitude. The research was made by recording the speckle images from the vibrating surface of the object with its digital processing later.

In today's highly developed economic and social context, humanity is increasingly realizing the importance of sustainable development alongside the full utilization of resources. Consequently, some scholars advocate for the adoption of Green Gross Domestic Product (GGDP) as a more reflective measure of economic health, replacing GDP, while also assessing the sustainability of economic and social development. This paper, taking into account the direction of human society towards sustainable development, refines previous research efforts. Using forestry as an example, it establishes a GGDP accounting model based on the principle of maximum sustainable development and demonstrates its validity.

In the context of the continuous growth of global demand for energy storage, electrochemical energy storage systems stand out among many energy storage technologies due to their excellent performance. At present, batteries as one of the most mainstream forms of electrochemical energy storage, such as fuel cells, lithium-ion batteries, and solid-state batteries, have been widely used. In particular, as the safety hazards existing in lithium-ion batteries due to the inclusion of organic electrolytes have gradually been recognized, solid-state batteries have received extensive attention and in-depth research for their higher safety performance. As an emerging electrochemical energy storage device, the most prominent feature of solid sodium-ion batteries is that they use solid electrolytes instead of traditional liquid electrolytes, which greatly improves the safety of batteries theoretically. Unfortunately, while solid electrolytes exhibit excellent chemical stability and good electrochemical performance, they still face a number of challenges in practical applications, including low ionic conductivity, poor interface contact, and short life span. In this paper, the characteristics, challenges, and solutions of electrolytes in solid-state sodium-ion batteries are discussed.

The purpose of this study is to solve the problem: in the warehouse temperature and humidity monitoring, due to the wide area and large number of warehouses, a large number of monitoring systems and equipment are arranged, which need to reduce investment and maintenance costs. Considering the same geographical environment, select 1 or 2 typical warehouses to represent the temperature and humidity of this region, so as to reduce the investment of monitoring equipment. We experimented with two regions separately, with 5 warehouses in each region. Temperature and humidity were collected for a period of time, and cluster analysis was carried out based on their maximum value, average value or comprehensive statistics of the two regions. The results show: (1) When clustering according to the maximum temperature and humidity, there are 2 types of significant differences warehouses in the same geographical environment. (2) When clustering according to the mean value of temperature and humidity, there are 2 or 3 types of significant differences warehouses in the same geographical environment, and the clustering result is different from that of clustering according to the maximum value. (3) When clustering according to the maximum value and average value of temperature and humidity, there is no significant difference warehouses in the same geographical environment, which can be classified as the same warehouse. No matter considering the maximum value, average value or the combination of the two statistics, the typical warehouse can be selected to represent the same geographical environment, so as to reduce the monitoring equipment investment and storage management workload.

The relationship between parenting styles (PS) and anxiety and depressive symptoms is one of the key research topics today. Researchers have found progress in the cause of adolescents’ anxiety and depressive symptoms regarding parenting styles. However, there are still research gaps for factors related to PS. Therefore, this study investigates the effect of PS on adolescents’ anxiety and depressive symptoms and treats self-efficacy (SE) as the mediator by collecting data from several scales (SAS, SDS, s-EMBU-C and GSE) and conducting SPSS 21.0 analysis on the data. According to the results in this paper, the father’s emotional warmth parenting style (EWPS) could affect the level of anxiety, whereas that of the mother had an insignificant result. Besides, both parents’ EWS were negatively and indirectly correlated with depression in significance. Additionally, the rejection parenting style (RPS) and over-protection parenting style (OPPS) affected anxiety and depression significantly directly and positively (all p < 0.05). That result turned out to be insignificant in the indirect path. Generally, this research provides an appropriate suggestion to lower anxiety and depressive symptoms. The suggestion is to encourage parents to offer more emotional warmth to their children instead of being RPS and OPPS.

The composite wall studied in this paper is based on the original cold-fonned thin-walled steel-straw board composite wall, which is set up with inclined braces and rigid inclined braces to improve its seismic performance. The factors of aspect ratio are analyzed, and the formula of shear bearing capacity of composite wall is deduced. The results show that: (1) When the height-width ratio of the composite wall is 2.4m×1.2m, 1.8m×1.2m and 1.2m×1.2m respectively, the yield strength of the composite wall is 35.78kN, 37.47kN and 54.23kN respectively. The yield strength of the former increases by 4.72 %, and the yield str ength of the latter increases by 44.73 %. (2) Using the effective strip method, the error of the derived shear capacity formula is not large, and the difference between the experimental value and the simulated value is not large, in order to provide some reference for the seismic design of this kind of cold-fonned thin-walled steel-strawboard composite wall with diagonal brace.

The ability of engineering graduate students to use their knowledge and independently engage in scientific research is one of the important indicators to measure the quality of postgraduate training. This paper takes the comprehensive improvement of graduate students’ ability to engage in scientific research independently as the starting point, and improves the teaching quality of basic courses of graduate majors in an all-round way by constructing teaching methods of basic knowledge intensive teaching, knowledge application and case process teaching, so that students can deeply grasp the course knowledge system and flexibly apply the knowledge learned in the course learning process. Finally, it lays a good foundation for students to engage in scientific research independently.

Aiming at the problems of bottom water coning and oil well flooding caused by the large impact of the early production strength of the Jurassic bottom water direct contact well in the Seventh Oil Production Plant. Carry out research on nitrogen foam control bottom water coning technology, mainly including: ①laboratory test to optimize foam system suitable for Jurassic system of No. 7 Oil Production Plant, determine injection concentration and optimal gas-liquid ratio; ②The nitrogen foam injection timing and shut in time were optimized by numerical simulation method; ③Summarize the field tests that have been carried out, and determine the optimal combination of parameters suitable for the Jurassic nitrogen foam pressure cone of No. 7 Oil Production Plant.

With the promotion of reform in various fields and the release of vitality of fishery development, Chinese fishery has achieved sustained and rapid development. Today, China has become one of the largest fishing countries, with abundant offshore and pelagic fishing routes, and a large number of vessels. The result is more and more pollutants emitted by vessels, which seriously affects the air quality of the surrounding environment. In this paper, a survey of offshore fishery resources in the East China Sea in 2020 was selected as the research object. The emission factors were summarized combined with the existing research results. The operation status of the survey was divided, and the calculation flow chart of air pollutant emissions was established, finally the emission inventory was estimated. The sharing rate of main/auxiliary engine and different operation status was discussed. The research data is the basement for the green, energy-saving, low-carbon and sustainable development of fishery in the future.

At present, loose-leaf teaching materials are attracting more and more attention in higher vocational institutions and have become a hot topic now. However, since the development of loose-leaf teaching materials is still in its beginning and exploratory stage, the examples of loose-leaf teaching materials for specialized courses are very hard to find. In fact, there is little research and application of how teaching objectives, content structure, teaching methods and teaching effectiveness reflect the original intention of loose-leaf teaching materials, especially there is little empirical evidence and reporting on teaching effectiveness. In this paper, we adopt the concept of outcome-based teaching model and take “Check-in” in Professional English for Hotel Staff course as an example to demonstrate the development and design of loose-leaf teaching materials and their features of career guidance, brevity and clarity, simplicity and practicality, real time and flexibility. By comparing the fourth semester exam results of 125 students majoring in hotel management from the class of 2013 to the class of 2016, who used traditional hotel English textbook，with the fourth semester exam results of 112 students from the class of 2017 to the class of 2020, who used loose-leaf teaching materials of hotel English in a higher vocational college, the advantages of the “4Es” embodied in loose-leaf teaching materials, namely, easy to teach, easy to learn, easy to understand and easy to use, and their effectiveness are revealed. According to the current study and preliminary teaching results, the development of the loose-leaf textbook based on the concept of outcome-based teaching model has been effective.

China and Japan are close neighbors who belong to the same East Asian Chinese character culture system, and have many similarities in language and folk culture. This thesis takes folk culture as a research perspective, and compares the similarities and differences between Chinese and Japanese cultures in terms of food culture and taboo culture respectively. Firstly, the article explains the definition scope and classification criteria of folk culture; secondly, the two points of food culture and taboo culture are selected for comparison from material folklore and spiritual folklore. Food culture focuses on table manners, cooking standards and eating habits, and analyzes the reasons for the formation of food culture from three aspects: economic development, geographical environment and social culture. Finally, the scope of taboo culture is large, so this paper selects two representative differences in numerical taboos and color taboos for discussion, showing the preference of Chinese and Japanese folklore. Finally, a short summary of the significance of folk culture for cross-cultural communication is presented.

The ability to predict the environmental conditions of surface water is crucial for prompting the refined management of surface water pollution in China. This paper carried out research on the prediction method of surface water quality based on deep learning algorithms and combined with the real-time data of national automatic monitoring of surface water quality. Under the encoder-decoder framework, the research proposed a CNN-BiLSTM-Attention water quality prediction model which contains CNN, bidirectional LSTM, and attention mechanism. To evaluate the performance of the proposed hybrid model, the research also compared the model with LSTM and CNN-LSTM models, carrying out a comparative analysis of the prediction results of each model through three performance metrics. The research results showed that compared with other models, the CNN-BiLSTM-Attention water quality prediction model can effectively take advantages of each neural network layer and has better prediction ability and higher stability for forecasting future water quality, which can provide strong technical support for water environment management and early warning.

A 100 million ton crude oil purchases and sale contract signed between China and Russia, and the crude oil will pass through Kazakhstan and flow along the Alashankou-Dushanzi-Urumchi crude oil pipeline to western Region. As an important crude oil import channel, this paper analyzes the current situation of Alashankou-Dushanzi-Urumchi crude oil pipeline and puts forward some countermeasures. Both Russia and Kazakhstan are major crude oil exporters, with internal demand for exporting crude oil to China. There is a huge gap between domestic crude oil demand, and social and economic development depends on crude oil import. The geographical environment of the crude oil pipeline is conducive to pipeline protection. The security environment of Xinjiang has improved. The situation in Russia and Ukraine and the civil strife in Kazakhstan have limited impact on the pipeline which will have good development opportunities. Thus, this paper proposes the following management strategies. First of all, strengthen communication and coordination between upstream and downstream enterprises. Second, reduce cost and increase efficiency. Third, attach importance of the application of new technologies. Fourth, establish emergency plans and hold emergency drills for emergencies such as COVID-19 outbreak and pipeline leakage. Fifth, strengthen anti-terrorism and riot control. Sixth, strengthen corporate culture and talent team construction.

The temperature of molten steel slag produced by the steelmaking process is 1500°c~1700°c, and the total amount of energy contained is considerable. Therefore, the efficient recovery and utilization of sensible heat of steel slag has always been the focus of attention of the metallurgical field all over the world. However, at present, the average recovery rate of waste heat resources per ton of steel in China's iron and steel industry is less than 26%, while the sensible heat recovery rate of various molten slag (including steel slag) is only 1.6%. There are huge room and a broad market for improvement.

Grape pomaces or vinification by-products are abundant and rich in polyphenols, particularly proanthocyanidins. During the last three decades, grape and wine polyphenols, particularly catechins (CATs) and oligomeric proanthocyanidins (OPCs) have attracted considerable attention of the international scientific community, due essentially to their potential health-beneficial effects, related to their protective action towards cardiovascular disease and the oxygen free radical scavenger capacity. Such phenolic compounds have been proved to be the key components responsible for the health-beneficial effects of red wine. Furthermore, although the most widely recognized antioxidants are Vitamins A, C, and E, scientific research has shown that OPCs are likely the most powerful antioxidants known. Although various OPCs have been available in the market, they are generally very expensive due to the high cost of their production. As a consequence, the development of efficient methods for large-scale preparation of these bioactive compounds have still a challenging task for scientists. In this communication, we will present a new and efficient technology for large preparation of bioactive polyphenols from vinification by-products (grape seed and grape skin). On one hand, polymeric proanthocyanidins were transformed into a series of low- molecule-weight bioactive compounds using various degradation methods. On the other hand, High-Speed Countcurrent Chromatography (HSCCC), as a relative new separation technology for natural product preparation, was applied to large and efficient isolation of these bioactive compounds.

According to the World Meteorological Organization, “record” greenhouse gas concentrations and heat accumulation have pushed the planet into uncharted territory, driving global warming. We need to figure out how to mitigate global warming by maximizing the overall benefits of forests based on the optimal deforestation period. This provides a basis for decision-making for forest managers. At the micro level, we only consider the carbon sequestration capacity of individual trees. AHP was used to determine the more important influencing factors. The S-curve model was fitted by single-factor and multi-factor analysis to obtain the carbon sequestration saturation point. It should be cut down at the saturation point of carbon sequestration. At the macro level, we consider the carbon sequestration capacity of forests. Therefore, from the economics perspective, we construct a carbon sequestration benefit model based on the optimal rotation period and deduce the optimal and maximum carbon sequestration benefits.