Monitoring environmental parameters contributes to the promotion of the crop production and quality in the vegetable greenhouse. LoRa technology is one of most promising candidate to build up wireless monitoring network due to its long data transmission distance, strong anti-interference ability, low power consumption. Here, we proposed an environment monitoring system based on LoRa network for vegetable greenhouse. The system consisted of sensor nodes, gateways and a data server, which could acquire real-time information on temperature, humidity, light intensity and carbon dioxide concentration at 1/3 of the cost of a similar system. Under indoor conditions where the distance between two nodes is 80m, the packet loss rate of the system is less than 0.05%. The greenhouse deployment results demonstrated that there was significant spatial variability in greenhouse environment and the difference of average soil temperature , air humidity, solar intensity and CO2 concentration value in different places was respectively up to 1.6 ?, 3.7%, 4681 lux and 141 ppm. This provides an important reference for the future precise control of greenhouses and the decision-making of relevant management measures. In addition, the harsh condition test and real-world deployment displayed our proposed system has high communication quality and work stability in the complicated greenhouse environment. Keywords: Wireless sensor network; Greenhouse environment monitoring; Precision agriculture; Spatial variability.

The objective of this work was to obtain optimal SC-CO2 extracting BHS oil process, response surface methodology (RSM) was applied to analyze effects of extraction pressure, extraction temperature, CO2 flow rate and extraction time on oil yield. Quality indices, fatty acid compositions and antioxidant activities were further compared between SC-CO2-extracted oil and Soxhlet-extracted oil. The results showed that the maximum recovery of BHS oil was 26.78 ± 2.75% (w/w) when SC-CO2 conditions were extraction pressure of 38.8 MPa, extraction temperature of 36.15 °C, CO2 flow rate of 7.51 L/min and extraction time of 3 h. SC-CO2-extracted BHS oil exhibited better transparency, smell and color as well as higher unsaturated fatty acid content than Soxhlet-extracted oil. Oleic acid, linoleic acid and linolenic acid contents were 12.75 ± 0.90%, 56.51 ± 1.74% and 19.18 ± 2.69%, respectively. Additionally, SC-CO2-extracted BHS oil showed higher iodine value, saponification value and tocopherol, lower acid value and peroxide values as well as stronger antioxidant activity than Soxhlet-extracted oil. In conclusion, RSM was successfully applied for SC-CO2 extraction optimization of BHS oil. SC-CO2 extraction was a better technique to produce higher value BHS oil than traditional Soxhlet extraction. Keywords Bama hempseed oil . Supercritical carbon dioxide extraction . Response surface methodology . Optimal processing . Fatty acid compositions

Biodegradable LDPE (Low-Density Poly Ethylene) film was industrialized with the mixture of control LDPE and rice bran. Three several mixtures 5% rice bran, 10% rice bran, and 15% rice bran was used for the preparation of biodegradable LDPE film. The films were analysed for the surface morphology and physico-mechanical analysis before microwave heating and after microwave heating. LDPE film equipped with 15% rice bran was created to beat method after microwave heating on the basis of tensile strength, percent elongation, bursting strength and water vapour transmission rate. The total migration of the test packaging materials was initiated within the agreeable limit and after microwave heating also it was within the permissible limit. The effect of rice bran on the morphology of LDPE mergers was observed using SEM. The analysed outcomes display that the total migrations of food package are reliant arranged microwaving period, package material categories and simulator kinds. KEYWORDS: Barrier Properties of Food packaging, Biodegradable film, Films, Food Packaging, Pasteurization

In this study, the migration rule of plasticizer to pork and its influencing factor (temperature and fat content) were studied with DEHP and DEHA in polyvinyl chloride (PVC) fresh-keeping film as objects. Based on the migration experimental data, the predicted model of DEHP and DEHA was presented using established Weibull distribution probability model. Finally, the migration prediction values, and experimental values were compared under two different conditions (17.5% fat content at 40 °C and 37.5% fat content at 25 °C), and the results showed that there were no significant differences. Keywords: PVC, plasticizer, Weibull, migration rule, prediction model

It is of great importance to extract and separate lactic and malic acids which used as raw materials in chemical industry. Taking into account its desirable selectivity of lactic and malic acids, the discovery of the novel extractant called N,N,N,N-Tetrabutylbutanediamide (N4423) is a innovation in this paper. Separation and purification the malic and lactic acids that present in the fermentation broth by reactive liquid-liquid extraction is the principal objective of this study. The lactic acid extraction was ideal when the reaction performed in the optimum conditions: 60 wt% of N4423, phase ratio (O/A) of 3, temperature at 35? and magnetic stirred 5 minutes. As a result, the purity of lactic acid exceeded 98%. Based on the slope method, the equilibrium concentration of lactic and malic acids in the organic phase were high enough to form the complexes which the mole ratio of N4423 to lactic acid and malic acid were 1.61, 1.86 respectively. FT-IR characterization indicated that the formation of hydrogen bonding between N4423 and lactic acid were predominant to the excellent extraction efficiency. The adopted reactive liquid-liquid extraction method is of low cost, low energy consumption and environmental friendliness. The N4423 has good extraction and separation efficiency of lactic and malic acids, the obtained lactic acid has high purity. The results gathered in this work might prove to be a potential approach to acquire lactic and malic acids. Keywords: reactive liquid-liquid extraction; separation; purification; lactic acid; malic acid