The Applications and Energy Saving Analysis of Straw Board Buildings in Cold Rural Regions of China

Sun Shijun,Zhao Yunduo,LuanYm. gTao 국제온돌학회 2014 International Journal of Ondol Vol.7 No.1

Straw board is renewable natural building material with the advantages of green environmental protection, strong applicability. But it hadn't been promoted because of many reasons such as technology and economy. Through the analysis ofthe unique advantages and the recent new cases of straw board buildings in Harbin, and the current obstacles to application. The effective ways and the feasible solutions to promote sustainable straw board buildings are summarized.

Green, Energy-efficient, Health and Comfort, the New Trend of Northeast Rural Residence - Taking Hai Gou Village, Acheng District, Harbin as an example -

Sun Shijun,Zhao Yun Duo 국제온돌학회 2013 International Journal of Ondol Vol.6 No.1

With the rapid development of the rural economy and vigorous promotion of energy-saving technologies, it is found through a field investigation that the new rural housing in the northeast of China shows new changes on green, energy-efficiency, health, comfort and beauty. The new rural housing mainly applied the technologies of composite energy-saving wall, double or three layers of glass energy saving windows and the roof benzene board insulation, heated in winter by Kang with the fuel of straw, corn stalks and other bio energy, which brings prominent energy-saving effect and the improved indoor environment significantly. The only or main function of the Kang is no longer the heating facilities in winter, but to play its unique benefits of comfort and health for sleep as a bed. the highlights of cultural traditions and customs in Cold rural area, the changes of the Kang are smaller and more exquisite. In the future, northeast rural housing should integrate the technolgies of residential structures, materials and kang further to promote rural sustainable development of society, economy.

An Innovative Training Program on Engineering Education

Sun, Juncai,Li, Song,Ji, Shijun Korean Society for Engineering Education 2014 공학교육연구 Vol.17 No.4

From 2010, an "excellent engineer" undergraduate and graduate program had been initiated in higher education of China to promote the development of industry and social economy. In this circumstance, the engineering education programs in Dalian Maritime University are reformed to satisfy the requirements of transportation industries. And the engineering practice, engineering activities, and engineering courses are emphasized. In this training program, industrial communities are deeply involved in the engineering education and training procedure; the students are educated and trained in university and enterprise according to the common standards and industrial standards; and the engineering competences and creative ability are emphasized and are to be enhanced in the training schedules and procedure. A joint-training mode has been established already between Dalian Maritime University and enterprises in transportation fields.

Cathode Materials LaNi_1−xCu_xO₃ for Low Temperature Solid Oxide Fuel Cells

Sun, Juncai,Wang, Chengli,Li, Song,Ji, Shijun The Korean Ceramic Society 2008 한국세라믹학회지 Vol.45 No.12

New cathode materials $LaNi_{1-x}{Cu_x}{O_3}$ (typically $LaNi_{0.8}Cu_{0.2}O_3$) were synthesized using a co-precipitation method. The structure and morphology of the powders were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The composite material [$Ce_{0.8}Sm_{0.2}O_{2-\ddot{a}}$(SDC) and carbonate (${Na_2}{CO_3},{Li_2}{CO_3}$)], NiO and $LaNi_{1-x}{Cu_x}{O_3}$ were used as the electrolyte, anode and cathode, respectively. The electrochemical performance of La-Ni-Cu-O perovskite oxide at low temperatures ($400{\sim}550^{\circ}C$) was studied. The results showed that $LaNi_{0.8}Cu_{0.2}O_3$ precursor powder prepared through a co-precipitation method and calcined at $860^{\circ}C$ for 2 h formed uniform grains with diameters in the range of $400{\sim}500\;nm$. The maximum power density and the short circuit current density of the single cell unit at $550^{\circ}C$ were found to be $390\;mW/cm^2$ and $968\;mA/cm^2$, respectively.

Cathode Materials LaNi1−xCuxO3 for Low Temperature Solid Oxide Fuel Cells

Juncai Sun,Chengli Wang,Song Li,Shijun Ji 한국세라믹학회 2008 한국세라믹학회지 Vol.45 No.12

New cathode materials LaNi1−xCuxO3 (typically LaNi0.8Cu0.2O3) were synthesized using a co-precipitation method. The structure and morphology of the powders were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The composite material [Ce0.8Sm0.2O2-ä(SDC) and carbonate (Na2CO3,Li2CO3)], NiO and LaNi1−xCuxO3 were used as the electrolyte, anode and cathode, respectively. The electrochemical performance of La-Ni-Cu-O perovskite oxide at low temperatures (400~550oC) was studied. The results showed that LaNi0.8Cu0.2O3 precursor powder prepared through a co-precipitation method and calcined at 860oC for 2 h formed uniform grains with diameters in the range of 400~500 nm. The maximum power density and the short circuit current density of the single cell unit at 550oC were found to be 390 mW/cm2 and 968 mA/cm2, respectively. New cathode materials LaNi1−xCuxO3 (typically LaNi0.8Cu0.2O3) were synthesized using a co-precipitation method. The structure and morphology of the powders were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The composite material [Ce0.8Sm0.2O2-ä(SDC) and carbonate (Na2CO3,Li2CO3)], NiO and LaNi1−xCuxO3 were used as the electrolyte, anode and cathode, respectively. The electrochemical performance of La-Ni-Cu-O perovskite oxide at low temperatures (400~550oC) was studied. The results showed that LaNi0.8Cu0.2O3 precursor powder prepared through a co-precipitation method and calcined at 860oC for 2 h formed uniform grains with diameters in the range of 400~500 nm. The maximum power density and the short circuit current density of the single cell unit at 550oC were found to be 390 mW/cm2 and 968 mA/cm2, respectively.

An Innovative Training Program on Engineering Education

Juncai Sun,Song Li,Shijun Ji 한국공학교육학회 2014 공학교육연구 Vol.17 No.4

From 2010, an “excellent engineer” undergraduate and graduate program had been initiated in higher education of China to promote thedevelopment of industry and social economy. In this circumstance, the engineering education programs in Dalian Maritime Universityare reformed to satisfy the requirements of transportation industries. And the engineering practice, engineering activities, and engineeringcourses are emphasized. In this training program, industrial communities are deeply involved in the engineering education and trainingprocedure; the students are educated and trained in university and enterprise according to the common standards and industrial standards;and the engineering competences and creative ability are emphasized and are to be enhanced in the training schedules and procedure. A joint-training mode has been established already between Dalian Maritime University and enterprises in transportation fields.

Recombinant human β-defensin130 inhibited the growth of foodborne bacteria through membrane disruption and exerted anti-inflammatory activity

Bin Dong,Yanjun Lin,Zhiwei Su,Chunlong Sun,Jun Wang,Shijun Fu,Wen Du,Tao Wu 한국식품과학회 2022 Food Science and Biotechnology Vol.31 No.7

Foodborne pathogens causing food poisoning and infections are detrimental to human health, and the abuse of antibiotics induced severe antibiotic resistance in past decades. Thus, it is urgent to develop new antimicrobial agents. In the current study, human β-defensin 130 (hBD130), which is an antimicrobial peptide identified in human macrophages in 2017, was initially produced in Pichia pastoris. The purified hBD130 demonstrated broad bactericidal spectrum against foodborne pathogens through a membrane disruption, with concentrations ranging from 10 to 45 μg/mL. Moreover, hBD130 showed a low hemolytic effect and nearly no cytotoxicity to mammalian cells with a dosage of 400 μg/mL. In addition, the secretion amounts and mRNA levels of NO, IL-6, IL-1β, and TNF-α in LPS-induced mouse macrophage were significantly decreased with 1 mg/mL of hBD130. Taken together, these results showed that hBD130 is a promising antimicrobial agent to treat foodborne bacterial infections and inflammation.

Antibacterial activity of antimicrobial peptide gcDefb1 against foodborne pathogenic bacteria and its application in pork storage

Bin Dong,Yanjun Lin,Jun Wang,Wen Du,Chunlong Sun,Tao Wu,Shijun Fu 한국식품과학회 2022 Food Science and Biotechnology Vol.31 No.5

Pork and its products are preferably contaminated by bacteria; thus, it is essential to develop low-cost, high-efficiency and biologically safe preservatives to prevent the growth of bacteria during storage. In the current study, grass carp β-defensin 1 (gcDefb1) was produced and purified from Pichia pastoris through the heterologous expression method. The in vitro antimicrobial assay demonstrated that yeast-derived gcDefb1 possesses a broad antibacterial spectrum, including both Gram-positive and -negative bacteria, and the MIC values against Escherichia coli ATCC 25,922 were as low as 30 μg/mL and showed no cytotoxicity or hemolytic activity. The bactericidal rate of gcDefb1 was less than 60 min by disrupting the cell membranes, and it inhibited the formation of bacterial biofilms. Moreover, gcDefb1 was used as a biopreservative for pork storage, indicating that the physicochemical and sensory qualities were improved. This study provides an efficient method to prepare and utilize gcDefb1 as a novel biopreservative.

Evaluation of Renal Oxygenation Level Changes after Water Loading Using Susceptibility-Weighted Imaging and T2* Mapping

Jiule Ding,Wei Xing,Dongmei Wu,Jie Chen,Liang Pan,Jun Sun,Shijun Xing,Yongming Dai 대한영상의학회 2015 Korean Journal of Radiology Vol.16 No.4

To assess the feasibility of susceptibility-weighted imaging (SWI) while monitoring changes in renal oxygenation level after water loading. Thirty-two volunteers (age, 28.0 ± 2.2 years) were enrolled in this study. SWI and multi-echo gradient echo sequence-based T2* mapping were used to cover the kidney before and after water loading. Cortical and medullary parameters were measured using small regions of interest, and their relative changes due to water loading were calculated based on baseline and post-water loading data. An intraclass correlation coefficient analysis was used to assess inter-observer reliability of each parameter. A receiver operating characteristic curve analysis was conducted to compare the performance of the two methods for detecting renal oxygenation changes due to water loading. Both medullary phase and medullary T2* values increased after water loading (p < 0.001), although poor correlations were found between the phase changes and the T2* changes (p > 0.05). Interobserver reliability was excellent for the T2* values, good for SWI cortical phase values, and moderate for the SWI medullary phase values. The area under receiver operating characteristic curve of the SWI medullary phase values was 0.85 and was not different from the medullary T2* value (0.84). Susceptibility-weighted imaging enabled monitoring changes in the oxygenation level in the medulla after water loading, and may allow comparable feasibility to detect renal oxygenation level changes due to water loading compared with that of T2* mapping.