The shear-horizontal(SH) waves excited by the shear source in a borehole are easy to analyze due to the simple waveform. The borehole-side structures make the formation properties discontinuous. We consider a cylindri...The shear-horizontal(SH) waves excited by the shear source in a borehole are easy to analyze due to the simple waveform. The borehole-side structures make the formation properties discontinuous. We consider a cylindrical double layer structure and study the borehole shear-horizontal and transverse-electric(SH-TE) seismoelectric waves. We first derive the expressions of the basic field quantities, and simulate the acoustic field and electric field using the real axis integral method. Compared with the wave fields of an infinitely homogeneous porous medium outside the borehole, the cylindrical layered structure makes the multi-mode cylindrical Love waves and their accompanying electric fields excited.Next, in order to study the interface response law of the inducing electric fields, we use the secant integral method to calculate the interface converted electromagnetic waves and analyze the causes of each component. It is found that an interface response occurs each time the SH wave impinges the interface in the layered porous medium. The results show that the SH-TE mode has a potential application for borehole-side interface detection in geophysical logs.展开更多
To understand the effects of Lactobacillus rhamnosus GG(ATCC 53103)on intestinal barrier function in pre-weaning piglets under normal conditions,twenty-four newborn littermate piglets were randomly divided into two gr...To understand the effects of Lactobacillus rhamnosus GG(ATCC 53103)on intestinal barrier function in pre-weaning piglets under normal conditions,twenty-four newborn littermate piglets were randomly divided into two groups.Piglets in the control group were orally administered with 2 mL 0.1 g/mL sterilized skim milk while the treatment group was administered the same volume of sterilized skim milk with the addition of viable L.rhamnosus at the 1st,3rd,and 5th days after birth.The feeding trial was conducted for 25 d.Results showed that piglets in the L.rhamnosus group exhibited increased weaning weight and average daily weight gain,whereas diarrhea incidence was decreased.The bacterial abundance and composition of cecal contents,especially Firmicutes,Bacteroidetes,and Fusobacteria,were altered by probiotic treatment.In addition,L.rhamnosus increased the jejunal permeability and promoted the immunologic barrier through regulating antimicrobial peptides,cytokines,and chemokines via Toll-like receptors.Our findings indicate that oral administration of L.rhamnosus GG to newborn piglets is beneficial for intestinal health of pre-weaning piglets by improving the biological,physical,and immunologic barriers of intestinal mucosa.展开更多
基金Project supported by the Natural Science Foundation of Jilin Province of China(Grant No.20180101282JC)the National Natural Science Foundation of China(Grant Nos.40974067 and 42074139)。
文摘The shear-horizontal(SH) waves excited by the shear source in a borehole are easy to analyze due to the simple waveform. The borehole-side structures make the formation properties discontinuous. We consider a cylindrical double layer structure and study the borehole shear-horizontal and transverse-electric(SH-TE) seismoelectric waves. We first derive the expressions of the basic field quantities, and simulate the acoustic field and electric field using the real axis integral method. Compared with the wave fields of an infinitely homogeneous porous medium outside the borehole, the cylindrical layered structure makes the multi-mode cylindrical Love waves and their accompanying electric fields excited.Next, in order to study the interface response law of the inducing electric fields, we use the secant integral method to calculate the interface converted electromagnetic waves and analyze the causes of each component. It is found that an interface response occurs each time the SH wave impinges the interface in the layered porous medium. The results show that the SH-TE mode has a potential application for borehole-side interface detection in geophysical logs.
基金Project supported by the National Natural Science Foundation of China (No. 31472128)the Special Research Fund for the PhD Program of University, China (No. 20110101110101)the Key Project of Science and Technology of Zhejiang Province, China (No. 2006C12086)
文摘To understand the effects of Lactobacillus rhamnosus GG(ATCC 53103)on intestinal barrier function in pre-weaning piglets under normal conditions,twenty-four newborn littermate piglets were randomly divided into two groups.Piglets in the control group were orally administered with 2 mL 0.1 g/mL sterilized skim milk while the treatment group was administered the same volume of sterilized skim milk with the addition of viable L.rhamnosus at the 1st,3rd,and 5th days after birth.The feeding trial was conducted for 25 d.Results showed that piglets in the L.rhamnosus group exhibited increased weaning weight and average daily weight gain,whereas diarrhea incidence was decreased.The bacterial abundance and composition of cecal contents,especially Firmicutes,Bacteroidetes,and Fusobacteria,were altered by probiotic treatment.In addition,L.rhamnosus increased the jejunal permeability and promoted the immunologic barrier through regulating antimicrobial peptides,cytokines,and chemokines via Toll-like receptors.Our findings indicate that oral administration of L.rhamnosus GG to newborn piglets is beneficial for intestinal health of pre-weaning piglets by improving the biological,physical,and immunologic barriers of intestinal mucosa.
