Dalian Of China Research Articles

Preface

2021 International Conference on Computer Technology and Power Electronics Jianning Wang1, Yuehua Zhao2 1College of Computer Science, Xi'an Shiyou University, China 2School of Computer Science and Telecommunication Engineering, Jiangsu University, ChinaE-mail: wjianning@xsyu.edu.cn, zhaoyuehua@ujs.edu.cn2021 International Conference on Computer Technology and Power Electronics were successfully held online from 30th to 31th of March 2021, Dalian, China. The conference was jointly organized and sponsored by Shaanxi Juxing Exhibition Co., Ltd and Juneng Electronic Technology Co., Ltd. The conference invited scholars and experts in the fields of the application of computer technology and power electronics from various universities to participate in the review and guidance of this conference. The conference focuses on the latest research fields such as "Computer Technology" and "Power Electronics", and aims to provide an international cooperation and exchange platform for experts, scholars and business managers in the fields of the application of computer technology and power electronics application to share their research achievements, discuss the key challenges and research directions of the development of this field, and jointly promote the industrialization cooperation and continuous innovation of international academic achievements. This collection of Proceedings compiles oral and paper presentations submitted by the authors and scrutinized by the Special Committee.The conference was scheduled to be held on March 30-31, 2021 in Dalian of China. In view of travel restrictions and indoor activities related to COVID-19, we were forced to move the conference online. Attendees were notified one month in advance that the on-site conference was changed to an online conference, and the time and order of the conference were determined. The online conference was held on the video conferencing software Tencent Meeting. The video conference was held on the original date. We divided the conference into main venue and sub-venue. The opening ceremony was held in the main venue and a speech was delivered by the invited speaker. After the main venue, we divided the invited 66 authors into 3 groups. Each author spoke for about 10-15 minutes on detailed material in the slides, with the same amount of time set aside for questions and discussion. The format of questioning and discussion was that after each author's introduction, the conference chairman and committee members asked and answered questions. At least one attendee could ask questions that will be answered by the speaker. This conference has brought together many excellent works and the latest ideas and concepts. New ideas have been provided in the fields of the application of computer technology and power electronics. For this, we have set up two awards, which were won by three authors. Due to the instability of the video conference software, we edited and retained part of the conference speech pictures and videos after the video conference. We put some screenshots of the conference on the official website for display.List of Organizing Committee, Scientific Committee, Editorial Committee, Invited Speakers, Organizing Institutions, Sponsors are available in this pdf.

Characteristics and risk assessment of organophosphate esters and phthalates in soils and vegetation from Dalian, northeast China

We investigated the concentration, composition, and potential risk of organophosphate esters (OPEs) and phthalates (PAEs) in soils and vegetation from rural areas of Dalian, Northeast China. The residues of total OPEs and PAEs in soils were in the range of 33.1–136 ng/g dw (dry weight) and 465–5450 ng/g dw, while the values in plants were 140–2360 ng/g dw and 2440–21800 ng/g dw, respectively. The concentrations of both chemicals in the plant rhizosphere soils were significantly lower than those in the bulk soils, suggesting an enhanced degradation or uptake by plant. The contaminations in soils also varied for different land use types with the concentrations generally higher in paddy soils than those in maize soils. The OPE and PAE concentrations in plant leaves were slightly higher than those in their corresponding roots. The bioconcentration factors of OPEs & PAEs were significantly negatively correlated with their octanol-water partition coefficients. A hazard assessment suggested potential medium to high risks from tricresyl phosphate (TMPP) and di-n-butyl phthalate (DNBP) for the agricultural soils in Dalian of China. Although the ecological risks of OPEs and PAEs in the rhizosphere soils were lower than those in the bulk soils, the relevant risk could still endanger human health via oral intake of these plants. The daily dietary intakes of OPEs and PAEs via vegetable and rice consuming were estimated, and the result suggests a higher exposure risk via ingestion of leafy vegetable than rice.

Effect of the environmental factors on diketopiperazine cyclo(Pro-Phe) production and antifungal activity of Bacillus amyloliquefaciens Q-426

Bacillus amyloliquefaciens Q-426 with strong antifungal activity was isolated from the compost samples in Dalian of China. Four kinds of diketopiperazines were extracted from the strain including cyclo(Pro-Phe) (cPP), which had cyclo(L-Pro-L-Phe), cyclo(D-Phe-L-Pro), cyclo(D-Pro-D-Phe) and cyclo(L-Pro-D-Phe) isomers. Results showed that (1) cPP production reached the maximum at 12 h and then maintained the constant yield; (2) cPP maintained a stable production in a wide temperature range of 31–42°C; (3) cPP production were quite different for various carbon sources because of the different growth rate of the strain; (4) cPP maintained a higher level yield in neutral and weakly alkaline environment (pH 6–10) than acid (pH 3–5) environment. Moreover, cPP played a negative effect on the synthesis of antifungal substance when the bacteria maintained a good growth, and the previous studies found that cPP showed a positive response to biosensors which were used to detect signal molecules. Based on these studies, diketopiperazines were suspected as the signal molecule of B. amyloliquefaciens Q-426.

Effect of heat and moisture transfer on the growth of mould on the inner surface of walls: A case study in Dalian of China

Due to the influence of outdoor climate and indoor human activities, the moisture accumulation of building enclosure structure will lead to the growth of mould on the interior surface of the wall, damage the building structure and endanger human health. Taking an office building in Dachangshan Island of Dalian, a cold area in North China, as an example, the outdoor relative humidity is high, and the temperature difference between indoor and outdoor is large during the heating period, which is easy to cause the increase of moisture content of the enclosure structure and the growth of mould. This study focuses on the influence of the heat and moisture transfer characteristics of the office building wall on the growth process of mould on the interior surface of the building. The dominant fungi of indoor air and wall surface were Penicillium and Cladosporium. WUFI software was used to simulate the heat and moisture transfer and the growth process of mould on the inner surface of the wall. The results show that the relative humidity of the air micro layer on the inner wall surface of the office building reaches more than 80% at the beginning of heating period in November every year, the mould hypha grows significantly in December and brings pollution risk. Finally, the relative humidity drops below 70% after the heating period is over in April, and the mould stops growing. The main reason for this phenomenon is that the condensation interface in the wall structure during the heating period leads to the accumulation of water in the wall, which is then transmitted to the wall surface through the wall pores, thus increasing the moisture content. This method provides a r eliable way for the numerical simulation of indoor mould growth risk.

Facilitation of Chinese-cultural adaptation for Japanese adults by verbal instructions: The effects of a seminar on cross-cultural experiences for Japanese residents in Dalian of China

Facilitation of Chinese-cultural adaptation for Japanese adults by verbal instructions: The effects of a seminar on cross-cultural experiences for Japanese residents in Dalian of China

Assessment of the genetic relationship between the recently established benthic population and the adjacent floating populations of Sargassum horneri (Phaeophyceae) in Dalian of China by newly developed trinucleotide microsatellite markers

Sargassum horneri is a conspicuous canopy-forming brown seaweed growing on solid substrates or floating on sea surface. A recently established benthic population was discovered in a bay in Dalian, China, in 2016 and suggested to be derived from the earlier floating population. Since 2016, floating populations have kept appearing in the adjacent area. The genetic connectivity between this recently established benthic population and the adjacent floating populations remains unclear. In this study, 10 novel informative trinucleotide microsatellite markers were developed through the high throughput sequencing technology, and employed to analyze the genetic structure of the benthic population (DS16 and DS18) and three adjacent floating populations (DL16, BL16, and DL18) sampled in 2016 and 2018, with one floating population collected from Shidao in 2016 (SD16) as reference. Significant genetic differentiation was found to exist between the benthic and floating populations, and among floating populations from different years. Almost no membership of floating populations was detected in the benthic population and vice versa by the Bayesian model–based structure analysis, indicating very limited genetic connectivity between them. Significant excess of heterozygosity, significant multilocus linkage disequilibrium, high frequency of repeated genotypes, and putative clones were detected in all floating populations, indicating that asexual reproduction is likely dominant in them. Inbreeding and founder effect were revealed to be present in the benthic population. Further studies will focus on tracking the dynamics of genetic structure in the recently established benthic population and investigating the exact reproductive means and patterns of floating populations.

Performance study of a novel hybrid solar PV/T ground-source heat pump system

A new system based on solar photovoltaic/thermal-ground source heat pump (PV/T-GSHP) was proposed to solve the problems of energy shortage and high energy-consuming buildings in China. The operation performance of the PV/T-GSHP system in a demonstration project in Dalian of China was studied and energy saving performance was analyzed. The results show that this PV/T-GSHP system can reduce the temperature of photovoltaic/thermal modules as high as 10℃, and improve the efficiency of electricity production by 25%, simultaneously. And in heating season the average COP of the heat pump remains around 3. Then the model of the PV/T-GSHP system was established based on the Polysun software, the system parameters were optimized, followed by analyzing the technical and economic of the project. The optimization data and energy saving effect of this demonstration system can provide guidance for future related project.

Effect of the Environmental Factors on Diketopiperazine Cyclo (Pro-Phe) Production and antifungal Activity of Bacillus amyloliquefaciens Q-426

Bacillus amyloliquefaciens Q-426 with strong antifungal activity was isolated from compost samples in Dalian of China. Four kinds of diketopiperazines were extracted from the strain including cyclo (Pro-Phe) (cPP) which had both D- and L-isomers. Studies in this paper found that cPP production and antifungal activity were affected by environmental factors including incubation time, temperature, pH and carbon source in the media. The results indicated that cPP had a significant effect on the antifungal activity of B. amyloliquefaciens Q-426, and the previous studies found that cPP showed a positive response to biosensors which were used to detect signal molecules. Based on these studies, diketopiperazines were suspected as the signal molecule of B. amyloliquefaciens Q-426.

A study of the site selection of a civil airport based on the risk of bird strikes: The case of Dalian, China

Bird strikes are a potential danger to aviation security. The threat of birds to the flight security of civil airplanes is hard to solve if the existence of birds in nature is ignored. An in-depth study on the living habits of birds and the request for a harmonious coexistence between birds and civil airplanes seems to be an effective way to relieve this contradiction. Taking the case of the site selection of the civil airport in Dalian of China, this paper comprehensively analysed the bird strike assessment of various species of birds near the sites of Zhoushuizi Airport and Jinzhou Bay Airport. The assessment of the risk of bird strikes demonstrated that the site of the Jinzhou Bay airport would have a smaller risk of bird strikes, which could greatly reduce collisions between birds and airplanes and promote aviation security. Such results provide a valuable reference for the site selection of the civil airport in Dalian. As bird strikes are a common problem in the field of civil aviation, the analysis and methods in this paper are a needed reference for the planning and land use of civil airports in other cities.

A Study on the Use of Housing Finance in Dalian of China

A Study on the Use of Housing Finance in Dalian of China

Key technologies of VSC-HVDC and its application on offshore wind farm in China

In recent years, wind power industry has been flourishing and in China the focus has been gradually shifted from land-based to offshore wind farms. There are many advantages for offshore wind farms, such as abundant wind energy reserves, high utilization of the wind turbine capacity, not taking up land resources and so on. As wind turbine technology improves, offshore wind farms have been expanding quickly and are located further away from the onshore grid. The power transmission problem has become one of the key issues for restricting the development of offshore wind farms. For example, the technology of high voltage direct current transmission based on voltage source converter (VSC-HVDC), suitable for long-distance transmission of offshore wind energy, has become one of the current research focuses. This has resulted in higher requirements on the aspects of converter voltage level, system dynamic performance, and network power quality. The paper first discusses converter topology for offshore wind farm grid integration. Two VSC-HVDC projects for connecting offshore wind farms, which are located in Shanghai and Dalian of China, are presented in detail. Based on the two projects, the structure, control methods and application of modular multi-level converter are presented. The control strategies of VSC-HVDC are then discussed, focusing on double closed-loop vector control, direct power control, deadbeat control and the control methods for unbalanced grid voltage. This can provide good theoretical foundation for the grid integration of large offshore wind farms.

Establishment and Analysis of 3D Structure in Co-Parenting Behavior of Pupil’s Parents

Questionnaire method was used to study co-parenting structure with a sample 775 of couples of school-age children in Dalian of China. At the same time, through situational observations, coding analyses and evaluating for 28 nuclear families’ parents, co-parenting behavior’s actuality and characteristics were shown. The results show that (1) Three factors covered in co-parenting structure: Harmonious-support, active-involvement and opposite-conflict; (2) Superior reliability and validity in self-designed, parental reported co-parenting questionnaire, a reliable test instrument measuring and analyzing the co-parenting behavior, three factors related model, turn to be reasonable and valid.

Isolation and characterization of a fungus Aspergillus sp. strain F-3 capable of degrading alkali lignin

A fungus strain F-3 was selected from fungal strains isolated from forest soil in Dalian of China. It was identified as one Aspergillus sp. stain F-3 with its morphologic, cultural characteristics and high homology to the genus of rDNA sequence. The budges or thickened node-like structures are peculiar structures of hyphae of the strain. The fungus degraded 65% of alkali lignin (2,000mgl(-1)) after day 8 of incubation at 30°C at pH 7. The removal of colority was up to 100% at 8days. The biodegradation of lignin by Aspergillus sp. F-3 favored initial pH 7.0. Excess acid or alkali conditions were not propitious to lignin decomposing. Addition of ammonium L: -tartrate or glucose delayed or repressed biodegradation activities. During lignin degradation, manganese peroxidase (28.2 U l(-1)) and laccase (3.5 U l(-1))activities were detected after day 7 of incubation. GC-MS analysis of biodegraded products showed strain F-3 could convert alkali lignin into small molecules or other utilizable products. Strain F-3 may co-culture with white rot fungus and decompose alkali lignin effectively.

The Baseline Ratio of Neutrophils to Lymphocytes is Associated with Patient Prognosis in Rectal Carcinoma

In cancer patients, the balance between neutrophil (N) and lymphocyte (L) cell counts fluctuates with advancing disease. The objective of our study was to determine the prognostic implications of the N/L ratio in the peripheral blood of rectal cancer patients. Study participants were identified from a prospective cohort of patients with rectal cancer in Dalian of China (n = 123). The median baseline N/L ratio was 2.41 +/- 2.206 (range, 0.76-20.45). Our results revealed that the N/L ratio was significantly associated with tumor size (P = 0.003) and level of cancer antigen 125 (P = 0.027). A multivariate Cox model established a significant relationship between the N/L ratio and survival (adjusted hazard ratio, 2.615; 95% confidence interval, 1.152-5.933; P = 0.021). These results suggest that the N/L ratio is an independent prognostic factor in rectal cancer, and the N/L ratio may serve as a clinically accessible and useful biomarker for patient survival.

中国東北・極東ロシア5都市における都市形成に関する研究 : 主体の多様性に着目した街区の変遷とその特徴

Urban space of Northeast China and Far East Russia could be considered as a stage where cultures and civilizations, provided by emigrants from various regions and countries, were blended and merged, then re-constructed. This study aims to distinguish the process of formation and changes of cities, referring to their historical backgrounds, which includes activities and changes of rulers. Harbin and Dalian of China, Blagoveshchensk, Khabarovsk and Vladivostok of Russia are the cities mainly investigated for this research. This paper is fundamental research based on fieldworks done from 1997. Discussion are made over the formation of urban space of northeast Asia considering changes of rulers of the time, which most of the time were also designers of each cities.