Key Control Point Research Articles

Method for Predicting Barge Impact Force Based on Nonlinear Spring Stiffness

Accurate prediction of barge impact force contributes greatly to the research of the soundness of the bridge under barge impact. Toward this end, the calculation method of barge impact force caused by ship-bridge collision is investigated in this study. Firstly, a comparative analysis for different energy conversion relationships is conducted via the high-precision finite element method (HPFEM) and the coupled vessel impact analysis (CVIA). A construction method of nonlinear spring stiffness (NSS) is proposed therefrom. Secondly, a high-precision finite element model is developed to simulate the barge-bridge collision under different barge masses and impact velocities. NSS under each condition is obtained, and the influences of barge mass and impact velocity on NSS are further discussed. An NSS model considering the effects of impact mass and impact velocity is proposed. Lastly, based on the NSS model, a prediction method of barge impact force is introduced. The results show that the impact mass has little influence on the peak value of NSS; however, the impact mass and impact velocity have a great influence on the tail of the NSS curve. According to the characteristics of NSS, four key control points can be extracted and NSS is simplified into a polyline model. The NSS model of the barge is obtained by nonlinear response surface fitting. The impact force can be predicted by combining the simplified NSS model and the proposed method in this study. The proposed method in this paper does not consider the pier stiffness; hence, it can be combined with NSS to quickly estimate the impact force, which can provide a design basis for the impact force in ship-bridge collision design. The rigid wall and a continuous rigid frame bridge impacted by the barge are studied; the results show that the proposed method can reasonably estimate the impact force.

Emergency responses to schistosomiasis outbreak during the stage moving towards elimination in China

Currently, the national schistosomiasis control program of China is moving from transmission control and transmission interruption to elimination; however, there is still a threat of schistosomiasis outbreak in area where the transmission of schistosomiasis has not been interrupted, and in areas where transmission interruption and even elimination have been achieved because of the complex factors relating to schistosomiasis transmission, as well as socioeconomic factors and natural environments, which greatly affects the consolidation of schistosomiasis control outcomes and the achievement of the goal of schistosomiasis elimination in the country. Here, we summarized the outbreaks of schistosomiasis in China during the past six decades, evaluated the impact of schistosomiasis outbreak on the national schistosomiasis control program and proposed management of schistosomiasis outbreak and prevention of schistosomiasis resurgence as the key point and difficulty for schistosomiasis control in the current stage. Improving the surveillance-response mechanisms and minimizing the development of schistosomiasis outbreak and the resultant damages and losses are recommended to provide technical supports for elimination of schistosomiasis in China.

Study of Risk Factors for Total Attack Rate and Transmission Dynamics of Norovirus Outbreaks, Jiangsu Province, China, From 2012 to 2018.

Objective: To describe the epidemiological characteristics of norovirus outbreaks in Jiangsu Province, utilize the total attack rate (TAR) and transmissibility (Runc) as the measurement indicators of the outbreak, and a statistical difference in risk factors associated with TAR and transmissibility was compared. Ultimately, this study aimed to provide scientific suggestions to develop the most appropriate prevention and control measures.Method: We collected epidemiological data from investigation reports of all norovirus outbreaks in Jiangsu Province from 2012 to 2018 and performed epidemiological descriptions, sequenced the genes of the positive specimens collected that were eligible for sequencing, created a database and calculated the TAR, constructed SEIAR and SEIARW transmission dynamic models to calculate Runc, and performed statistical analyses of risk factors associated with the TAR and Runc.Results: We collected a total of 206 reported outbreaks, of which 145 could be used to calculate transmissibility. The mean TAR in was 2.6% and the mean Runc was 12.2. The epidemiological characteristics of norovirus outbreaks showed an overall increasing trend in the number of norovirus outbreaks from 2012 to 2018; more outbreaks in southern Jiangsu than northern Jiangsu; more outbreaks in urban areas than in rural areas; outbreaks occurred mostly in autumn and winter. Most of the sites where outbreaks occurred were schools, especially primary schools. Interpersonal transmission accounted for the majority. Analysis of the genotypes of noroviruses revealed that the major genotypes of the viruses changed every 3 years, with the GII.2 [P16] type of norovirus dominating from 2016 to 2018. Statistical analysis of TAR associated with risk factors found statistical differences in all risk factors, including time (year, month, season), location (geographic location, type of settlement, type of premises), population (total number of susceptible people at the outbreak site), transmission route, and genotype (P < 0.05). Statistical analysis of transmissibility associated with risk factors revealed that only transmissibility was statistically different between sites.Conclusions: The number of norovirus outbreaks in Jiangsu Province continues to increase during the follow-up period. Our findings highlight the impact of different factors on norovirus outbreaks and identify the key points of prevention and control in Jiangsu Province.

Diagnosis and Management of Infected or Suspected Patients with Covid-19 a Study of 48 Cases in the UK

Covid-19 is a pandemic infective disease, which has been erupting throughout the whole world from 2020 to 2021. There have been at the time of reviewing more than a hundred million cases (102,399,513) of infection, and more than 2 million deaths (2,217,005) in more than 200 countries; this information is taken from the Covid-19 daily situation report issued on 1st Feb 2021 by WHO. The pandemic was also declared as an outbreak of Public Health Emergency of International Concern on 30th Jan 2020 by WHO. No effective treatment model has yet been confirmed by conventional western medicine, but some herbal treatments used in China can be recognized as having positive results in Covid-19 cases. This pandemic disaster has been severely damaging to quality of life, disturbing social communication, economic development and the progress of humanity. Successful results were first reported from temporary hospitals (Fangcang Hospitals set up in arenas and exhibition spaces) in Wuhan, China, where more than 90% of patients treated with Chinese herbal medicine were prevented by transferring from the minor or milder stages of the disease to the severe or critical stage. In all of them the positive PCR became negative; herbs were involved in the rescue and treatment of severe and critical cases in ICU’s in hospitals as well. It was an important factor in how Covid-19 was controlled so quickly in China. The author recruited both confirmed and suspected Covid-19 patients through social media (WeChat, WhatsApp, Internet, message etc.) as a volunteer TCM consultant from March 2020, during the first Lockdown phase in UK. It was quickly realized that the appearance of the tongue provides special and significant information for identifying whether Covid-19 is present and shows its severity, from a TCM perspective, as the degree and type of dampness accumulated within the body. Herbal prescriptions were sent by post for patients’ treatment according to their clinical findings, virus exposure history and tongue information (from photos). Similar positive effects were found as in China, and treatment reports and results are summarized here. The author believes there are many herbal medicines that can be effective in controlling the Sars-Cov-2 virus, and that prescribing the appropriate formula to match each individual case is the key point for TCM control of Covid-19. Chinese herbal medicine is the most effective current treatment method that can prevent cases in the minor and ordinary stages from progressing to the severe or critical stage, and so can play a significant role in the decrease and cure of Covid-19.

'Candidatus Liberibacter' Pathosystems at the Forefront of Agricultural and Biological Research Challenges.

'Candidatus Liberibacter' Pathosystems at the Forefront of Agricultural and Biological Research Challenges.

Research and Practice on the Quality Control of Medical Equipment Combined with the Overall Maintenance Service of Medical Equipment

<i>Purpose </i>In the face of the problems in medical equipment quality control, such as manpower shortage, lack of standardization, insufficient quality control equipment and weak information means, the implementation methods of medical equipment quality control are improved effectively by reorganizing the key points of quality control and introducing the overall maintenance service of medical equipment. <i>Methods</i> On the basis of researching and determining the quality control objects of medical equipment, formulating the work content of medical equipment quality control and supporting special quality control record sheets, formulating the work plan of medical equipment quality control, and adjusting the quality control content in time according to the actual clinical needs, our hospital has passed and the overall maintenance company of medical equipment cooperates closely and obtains the support of manpower, quality control equipment and information management tools to ensure that the quality control of medical equipment is in place. <i>Result </i>Through the standardization of medical equipment quality control, the efficiency of medical equipment quality control has been significantly improved, and the operation quality failure rate of quality control objects has decreased year by year, and we can find the hidden trouble of medical equipment operation quality and solve it accordingly. In addition, compared with hospital engineers, there is a certain gap in the medical equipment quality control ability of maintenance engineers in medical equipment overall maintenance service companies. At the same time, there are still some shortcomings in the coverage of quality control work. <i>Conclusion</i> Overall medical equipment maintenance service is conducive to the implementation of medical equipment quality control, and quality control is effective in improving the operation quality of medical equipment, and can guarantee the safety of medical service, but there is still a large space for improvement.

Consortium blockchains based traceability system for chicken product supply chain

In recent years, people pay increasing attention to food safety. Chicken, as the second largest meat consumer goods in China, requires high level quality traceability. However, due to the small monomer and large quantity of live poultry, it is difficult to duplicate the whole chain tracing mode of pig industry. In this paper we use HACCP (Hazard Analysis and Critical Control Points) to analyze the key control points in the chicken supply chain, and design the traceability code for each chicken product. The traceability system applies the consortium blockchains technology to realize the secure and trusted up-chaining of traceability data, which ensures the quality and safety of chicken in the market.

Discussion on Key Points of Quality Control in Measuring Process of Pressure Instrument

Discussion on Key Points of Quality Control in Measuring Process of Pressure Instrument

Key Points of Quality Control of Mountain Highway Retaining Wall Construction

Key Points of Quality Control of Mountain Highway Retaining Wall Construction

The Precise Estimation of Development Project Cost and its Life Cycle

Development plays a significant role in working out national projects in the field of house-building aimed at providing high-quality and affordable housing for the population of Russia. The key indicator for the development project is its cost, which affects both affordability for the population and finance and economic figures of the developer. Therefore, the system of cost management in the development company shall be formalized on the basis of design parameters, characterizing the project cost at all stages of the life cycle. The article proposes to use four interconnected indicators, the precise estimation of the project cost is assumed to be the principle one in the research. The authors worked out the model of development project cost management with due regard to stages of its life cycle, showed key events and relevant control points to assess precision, investigated and described methods of cost estimation at certain stages of the project life cycle (PLC). On the basis of real development projects they analyzed precision of cost estimation by stages of life cycle and plotted the graph ‘precision funnel’. The general positive dynamics in precise cost estimation was discovered, however the range of indicator incoherence would not allow us to adopt universal recommendations on its appraisal. The analysis showed the necessity to improve precision of cost estimation at early stages of project life cycles, which impacts the efficiency of the development project.

Construction of pharmacophore model and its application in identification of effective components of Chinese medicine

The effective material basis of Chinese medicine is the key and difficult point in the quality control and modernization research of Chinese medicine. With the increasing application of pharmacophore-based virtual screening in computer-aided drug design, it is possible to employ this technology in the modernization of Chinese medicine. Based on the systematic research method of the pharmacophore model, the present study systematically reviewed the pharmacophore-based technologies and strategies in the identification of active components in Chinese medicine.

The application of big data in the legal improvement of agricultural product quality and safety governance

ABSTRACT The quality and safety of agricultural products is not only related to the health of consumers, but also to the sustainable and stable development of the economy, and even to the harmony and stability of the society. The application of the theory model of multiple co-governance of agricultural product quality and safety has certain theoretical support. This paper applies big data technology to agricultural product quality and safety governance, and uses big data methods to study the key control points in the process of agricultural product traceability. Moreover, based on the selected key control points, this paper studies the key traceability indicators corresponding to the key control points of each link. In addition, this paper combines multi-disciplinary knowledge to carry out a systematic study on the legal issues of multivariate co-governance of agricultural product quality and safety in my country from the perspective of law. From the experimental research and the final decision-making suggestions, we can see that the method proposed in this paper is feasible.

On the Key Points of Construction Project Cost Budget Control and Its Grasp

On the Key Points of Construction Project Cost Budget Control and Its Grasp

Key Points of Whole Process Control of Construction Cost

Key Points of Whole Process Control of Construction Cost

Key Points of Asphalt Pavement Construction Technology and Quality Control in Highway Engineering

Key Points of Asphalt Pavement Construction Technology and Quality Control in Highway Engineering

The anabolism of sulphur aroma volatiles responds to enzymatic and non-enzymatic reactions during the drying process of shiitake mushrooms

The anabolism of aroma volatiles in response to non-biological factors during the drying process of shiitake mushrooms was analyzed. Temperatures (40 °C, 50 °C, and 60 °C) had secondary activation effects on the synthetase activity. The enzymatic reaction time could last 4–5 h under medium-temperature drying process (40 °C and 50 °C), and 1.5–2 h under a high-temperature drying process (60 °C and 70 °C). The aroma synthesis dominated by non-enzymatic reactions were chemical reactions between amino acids and reducing sugars. The hot-air drying process of shiitake mushroom was consistent with the cubic model and the key control points influencing the enzymatic reaction parameters were in the order of moisture rate > temperature > drying time > drying rate. The non-enzymatic reaction parameters were in the order of temperature > drying time > drying rate > moisture rate. The total sulfur volatiles produced in the optimized process were significantly higher, and the drying time of the process could be completed within 6 h.

Research on Key Points of Control and Technical Countermeasures in Road and Bridge Engineering Construction

Research on Key Points of Control and Technical Countermeasures in Road and Bridge Engineering Construction

Key Points of Construction and Quality Control of Transmission Line in Communication Engineering

Key Points of Construction and Quality Control of Transmission Line in Communication Engineering

Analysis on Key Points of Expressway Asphalt Pavement Construction and Quality Control

Analysis on Key Points of Expressway Asphalt Pavement Construction and Quality Control

Discussion on the Key Points of Construction Technology and Quality Control of Metro Communication Engineering

Discussion on the Key Points of Construction Technology and Quality Control of Metro Communication Engineering