Design of Intelligent Irrigation Monitoring System Based on GPRS and Zigbee

In order to solve the present dual contradiction of the low utilization of water resources in China's agricultural sector and the low land management efficiency,using Zigbee wireless sensor network and GPRS technology,this paper designs an intelligent monitoring system based on the GPRS and Zigbee wireless network technology. The Zigbee wireless sensor network is established based on the IEEE 802. 15. 4 / Zigbee protocol,consisting of terminal node for capturing and transmitting soil and environmental information to the coordinator node( gateway node)or acting the control command from the GPRS network. The irrigation remote monitoring network layer consists of coordinator node connected by the TCP / IP protocol,which can implement the precision irrigation of crops and the information management of arable land to the monitor center or user. And the monitor center using Java to write the system is safe and effective.

A Novel Magnetic Carbon Based Catalyst Synthesized from Reed Straw and Electric Furnace Dust for Biodiesel Production

In the era of serious greenhouse gas emission and energy shortage,it is necessary to use solid waste to prepare new renewable materials.In this work,the potential application of reed straw and electric furnace dust was explored.Firstly,magnetic carbon carrier(EFD&C)was prepared by high temperature calcination,and then magnetic carbon catalyst(SM@EFD&C)was prepared by activation of sodium methoxide.The catalyst was used to prepare biodiesel by transesterification reaction to test its activity and stability.Reed biochar,EFD&C and SM@EFD&C were detected by Diffraction of X-rays(XRD),Fourier transform infrared(FT-IR),Inductively coupled plasma(ICP),Scanning electron microscope(SEM),Transmission electron microscope(TEM),Brunauer-Emmett-Teller(BET),Vibrating sample magnetometer(VSM),Temperature programmed desorption of CO_(2)(CO_(2)-TPD)and Thermogravimetric analysis(TG-DTG).The results showed that SM@EFD&C catalyst had some characteristics including porous structure,easy adsorption and better magnetism.Under the reaction conditions of 65℃for 2 h with 6 wt%catalyst and methanol/oil molar ratio of 15:1,the biodiesel yields from reed biochar and EFD&C were only 4.88 wt%and 0.03 wt%,respectively,while the yield from SM@EFD&C catalyst reached 93.14 wt%(89.84 wt%after 7 cycles)under the same conditions,which proved that it had good catalytic activity and stability when used in biodiesel production.This study is of great significance of carbon dioxide emission reduction and environmental protection.

Performance Comparison of Three Algorithms Applied to UM2000 Signal Demodulation

UM2000 signal is a type of multi-audio frequency-modulated signal which is widely used for railway blocking. Principles of three typical demodulating algorithms are presented in details in this paper. Bit error rates of the three methods at different SNRs are achieved by Monte Carlo simulation experiments. Among the three algorithms, the quadrature demodulation has the best performance at the real working environment. However, the three methods have the same problem of phase hopping when noise is too strong.

Chimeric antigen receptor T (CAR-T) cells expanded with IL-7/IL-15 mediate superior antitumor effects

Dear Editor,Genetic engineering of T cells to express chimeric antigen receptors(CARs)is an efficient approach for clinical therapy of hematological malignancies(Kuwana et al.,1987;Eshhar et al.,1993;Barrett et al.,2014).The CARs endow T cells with the ability to recognize specific antigens and bind them in an MHC-independent mariner,thereby overcoming some of the mechanisms that mediate tumor immune escape.In addition,by providing co-stimulatory signals,CARs endow T cells with enhanced cytotoxicity and persistence compared with primary T cells.A typical CAR comprises a single-chain variable frag me nt(scFv)derived from a monoclonal an tibody(mAb)for an tige n recog nition and signaling domains for co?activation(Eshhar et al.,1993;Sadelain et al.,2013).

Postbiotics as potential new therapeutic agents for sepsis

Sepsis is the main cause of death in critically ill patients and gut microbiota dysbiosis plays a crucial role in sepsis.On the one hand,sepsis leads to the destruction of gut microbiota and induces and aggravates terminal organ dysfunction.On the other hand,the activation of pathogenic gut flora and the reduction in beneficial microbial products increase the susceptibility of the host to sepsis.Although probiotics or fecal microbiota transplantation preserve gut barrier function on multiple levels,their efficacy in sepsis with intestinal microbiota disruptions remains uncertain.Postbiotics consist of inactivated microbial cells or cell components.They possess antimicrobial,immunomodulatory,antioxidant and antiproliferative activities.Microbiota-targeted therapy strategies,such as postbiotics,may reduce the incidence of sepsis and improve the prognosis of patients with sepsis by regulating gut microbial metabolites,improving intestinal barrier integrity and changing the composition of the gut microbiota.They offer a variety of mechanisms and might even be superior to more conventional‘biotics’such as probiotics and prebiotics.In this review,we present an overview of the concept of postbiotics and summarize what is currently known about postbiotics and their prospective utility in sepsis therapy.Overall,postbiotics show promise as a viable adjunctive therapy option for sepsis.