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A Property Satisfying Reducedness over Centers

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Algebra Colloquium 2021年第3期28卷 453-468页

作者： Hailan Jin Tai Keun Kwak Yang Lee zhelin piao Department of Mathematics Yanbian UniversityYanjiJilin 133002China Department of Mathematics Daejin UniversityPocheon 11159Korea Institute of Basic Science Daejin UniversityPocheon 11159Korea

This article concerns a ring property called pseudo-reduced-over-center that is satisfied by free algebras over commutative reduced *** properties of radicals of pseudo-reduced-over-center rings are investigated,especially related to polynomial *** is proved that for pseudo-reduced-over-center rings of nonzero characteristic,the centers and the pseudo-reduced-over-center property are preserved through factor rings modulo nil *** a locally finite ring R,it is proved that if R is pseudo-reduced-over-center,then R is commutative and R/J(R)is a commutative regular ring with J(R)nil,where J(R)is the Jacobson radical of R.

关键词： pseudo-reduced-over-center ring center radical commutative ring polynomial ring right quotient ring Abelian ring

Remarks on Centers of Rings

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Algebra Colloquium 2021年第1期28卷 1-12页

作者： Juan Huang Hailan Jin Tai Keun Kwak Yang Lee zhelin piao Department of Mathematics Yanbian UniversityYanjiJilin 133002China Department of Mathematics Daejin UniversityPocheon 11159Korea Institute of Basic Science Daejin UniversityPocheon 11159Korea

It is proved that for matrices A,B in the n by n upper triangular matrix ring T_(n)(R)over a domain R,if AB is nonzero and central in T_(n)(R)then AB=*** n by n full matrix rings over right Noetherian domains are also shown to have this *** this article we treat a ring property that is a generalization of this result,and a ring with such a property is said to be weakly *** class of weakly reversible-over-center rings contains both full matrix rings over right Noetherian domains and upper triangular matrix rings over *** structure of various sorts of weakly reversible-over-center rings is studied in relation to the questions raised in the process *** also consider the connection between the property of being weakly reversible-over-center and the related ring properties.

关键词： weakly reversible-over-center ring center commutative domain right Noetherian domain reduced ring full(upper)triangular matrix ring NI ring

Pre-inflation and trans-Planckian censorship

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Science China(Physics,Mechanics & Astronomy) 2020年第11期63卷 27-35页

作者： Yong Cai YunSong piao School of Physics University of Chinese Academy of SciencesBeijing 100049China Institute of Theoretical Physics Chinese Academy of SciencesBeijing 100190China

We investigate the implication of trans-Planckian censorship conjecture(TCC)for the initial state of primordial *** is possible to set the state of perturbation modes in the infinite past as the Minkowski vacuum,only if the pre-inflationary era is *** calculate the evolution of the perturbation modes in such a pre-inflationary era and show that at the beginning of inflation the perturbation modes with wavelengths much shorter than the Hubble scale(but still larger than the Planck length scale)will behave as they are in the Bunch-Davis ***,a past-complete pre-inflationary evolution may automatically prepare the initial state required for the inflationary perturbations at the CMB window while obeying the TCC.

关键词： inflation primordial perturbation trans-Planckian censorship conjecture

Pseudo almost periodic solutions for the systems of differential equations with piecewise constant argument [t + 1/2]

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Science China Mathematics 2004年第1期47卷 31-38页

作者： piao Daxiong Department of Mathematics Ocean University of China Qingdao 266071 China

In this paper we investigate the existence and uniqueness of pseudo almost periodic solutions and unboundedness of other solutions for the systems of differential equations with piecewise constant argument [t + 1/2] by means of new notion of pseudo almost periodic vector sequences. The case in which the characteristic equation has multiple roots is considered.

关键词： pseudo almost periodic functions, pseudo almost periodic vector sequences, piecewise constant arguments, ergodic perturbation.

An Experimental Study on the Phenomena inside the Burning Aviation Kerosene Droplet

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Journal of Thermal Science 2021年第6期30卷 2202-2213页

作者： HE Ming piao Ying School of Aerospace Engineering Tsinghua UniversityBeijing 100084China

This paper conducted an experimental study of droplet behavior characteristics occurring within a burning aviation kerosene droplet and on the droplet *** droplet combustion was performed in a quiescent high-temperature environment by means of the droplet suspension *** soot particles were used as tracers to visualize the fluid motion in the *** shape variation of droplet,internal flow pattern in the burning droplet,and instabilities at gas-liquid phase interface were recorded by a high speed *** internal fluid flow in the droplet was revealed to be caused by the Marangoni effect,which was generated because of the surface tension gradient induced by the temperature gradient on the droplet *** studies showed that the Marangoni effect has a significant impact on the internal *** amplitude of the capillary waves on the surface of the droplet was non-uniform and presented the amplitude characteristics of *** wavelength of the capillary waves for burning aviation kerosene droplet ranged from 110μm to 120μm.

关键词： droplet combustion internal flow Marangoni effect capillary waves

Use of 25-hydroxyvitamin D_(3) in diets for sows:A review

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Animal Nutrition 2021年第3期7卷 728-736页

作者： Lianhua Zhang Xiangshu piao State Key Laboratory of Animal Nutrition College of Animal Science and TechnologyChina Agricultural UniversityBeijing 100193China

Dietary supplementation with 25-hydroxyvitamin D_(3)(25OHD_(3)),as an alternative source of vitamin D,is becoming increasingly popular due to its commercialization and more efficient *** addition of 25OHD_(3)rather than its precursor vitamin D_(3)can circumvent the 25-hydroxylation reaction in the liver,indicating that supplementation of 25OHD_(3)can rapidly improve the circulating vitamin D status of *** experiments have reported that maternal 25OHD_(3)supplementation could increase sow performances and birth outcomes and promote circulating vitamin D status of sows and their *** milk fat content was observed in many experiments;however,others demonstrated that adding 25OHD_(3)to lactating sow diets increased the contents of milk protein and *** an inconsistency between the results of different experiments exists,these studies suggested that maternal 25OHD_(3)supplementation could alter milk composition via its effects on the mammary *** studies have demonstrated that adding 25OHD_(3)to sow diets could improve the mRNA expressions of insulin-induced gene 1(INSIG1)and sterol regulatory element-binding protein 1(SREBP1)in the mammary gland cells from milk and increase the mRNA expressions of acetyl-CoA carboxylaseα(ACCα)and fatty acid synthase(FAS)in the mammary gland *** 25OHD_(3)supplementation promotes skeletal muscle development of piglets before and after parturition,and improves bone properties including bone density and bone breaking force in lactating sows and their ***,25OHD_(3)supplementation in sow diets could improve neonatal bone development via regulation of milk fatty acid composition related to bone metabolism and *** this review,we also discuss the effects of adding 25OHD_(3)to sow diets on the gut bacterial metabolites of suckling piglets,and propose that butyrate production may be associated with bone ***,to better understand

关键词： 25-Hydroxyvitamin D3 Milk composition Skeletal muscle Bone quality Bacterial metabolite

Different dietary protein sources influence growth performance,antioxidant capacity,immunity,fecal microbiota and metabolites in weaned piglets

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Animal Nutrition 2022年第1期8卷 71-81页

作者： Lianhua Zhang Xiangshu piao State Key Laboratory of Animal Nutrition College of Animal Science and TechnologyChina Agricultural UniversityBeijing100193China

The inclusion of high-quality proteins are commonly used in swine *** research investigated the effects of hydrolyzed wheat protein(HWP),fermented soybean meal(FSBM),and enzyme-treated soybean meal(ESBM)on growth performance,antioxidant capacity,immunity,fecal microbiota and metabolites of weaned piglets.A total of 144 piglets(weaned at 28 d)were allotted to 3 dietary treatments with 6 replicate pens per treatment and 8 piglets per *** study included 2 periods:d 0 to14 for phase 1 and d 15 to 28 for phase *** treatments contained 15.90%HWP,15.80%FSBM,and 15.10%ESBM in phase 1,and 7.90%HWP,7.80%FSBM,and 7.50%ESBM in phase 2,*** ADG of piglets in ESBM was increased(P<0.05)compared with HWP and FSBM during d *** with HWP and FSBM,ESBM increased(P<0.05)the ferric reducing ability of plasma(FRAP),and the serum level of superoxide dismutase(SOD)in piglets on d 14,as well as increased(P<0.05)the serum FRAP level in piglets on d *** decreased(P<0.05)serum levels of DAO and IL-1b in piglets compared with HWP on d *** enhanced(P<0.05)the relative abundance of Bacteroidetes,Oscillospiraceae and Christensenellaceae,as well as reduced the relative abundance of Clostridiaceae in the feces compared with HWP and *** PICRUSt analysis revealed that the number of gene tags related to degradation of valine,leucine and isoleucine,as well as lysine degradation in ESBM were lower(P<0.05)than that in HWP and *** increased(P<0.05)the fecal butyrate level in piglets compared with FSBM,and ESBM tended to decrease(P=0.076)the fecal cadaverine ***,ESBM had advantages over HWP and FSBM in improving antioxidant status,immune function,fecal bacteria and metabolites for weaned piglets.

关键词： Protein source Antioxidant capacity Immunity Bacterial community Metabolites Piglet

Mechanism underlying treatment of diabetic kidney disease using Traditional Chinese Medicine based on theory of Yin and Yang balance

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Journal of Traditional Chinese Medicine 2018年第5期38卷 797-802页

作者： piao Yuanlin Yin Dehai Department of Traditional Chinese Medicine Peking Union Medical College Hospital Peking Union Medical College and Chinese Academy of Medical Sciences

The pathogenic mechanism of diabetic kidney disease(DKD) is complex. The development of DKD cannot be fully explained by a single *** Chinese Medicine(TCM) has been applied extensively for the treatment of DKD in ***, studying the mechanism of DKD using theories and methods that are appropriate for TCM characteristics and searching for theoretical bases for TCM clinical application are topics that still need to be explored and researched. Activation of the transforming growth factor(TGF)-β1/Smad and PI3 K/Akt/mTOR signaling pathways functions as a self-protection mechanism against renal microinflammation in DKD. However, the persistent abnormal overactivation of reactions causes secondary cell dysfunction, cell apoptosis, increased extracellular matrix(ECM) secretion, and eventually renal fibrosis. During this process, the dysregulation of self-balance among a variety of signaling pathways and the loss of self-feedback regulatory mecha-nisms downstream of these signaling pathways are critical causes of the occurrence and development of DKD. TCM may both inhibit the expression or activation of "hyperactive" signaling pathways(NFB, Smad3, and PI3 K/Akt/mTOR) and increase the expression or activation of "deficient" signaling pathways(Smad7 and PTEN) to restore balance to cells with an abnormal pathophysiological status and achieve the goal of DKD treatment.

关键词： Diabetic kidney disease Traditional Chinese Medicine Yin and Yang theory

A Highly Isolated Co-Polarized Co-Located Electric and Magnetic Dipoles and Its MIMO Performance

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China Communications 2018年第5期15卷 104-110页

作者： Xingning Jia Dazhi piao Department of Communication Engineering Communication University of China

In this paper, a co-polarized, co-located electric and magnetic dipoles(CCEMD) with high isolation is presented. The antenna consists of a loop based on segmented line and two independent feeding ports. Two modes of the antenna are exited separately, the first one has a radiation pattern equivalent to an electric dipole by exciting anti-phase current with symmetric distribution, and the second one is like a magnetic dipole by exciting uniform and in-phase currents along the loop. The antenna is fabricated and tested. Its measured common-10 d B impedance bandwidth at two ports is 280 MHz(2.32-2.6 GHz) with isolation better than 41 d B. Its MIMO performance in terms of capacity gain(CG) over the SISO system is investigated in a multipath rich environment containing two parallel PEC planes by both measurements and image theory based simulations. Results show that, in free space, the CG results are just slightly larger than 1, however, in the multipath rich channel, the CG values are very close to 2, which indicates that two separate subchannels can be achieved by the proposed CCEMD. The measured results of CG agree well with that obtained by simulation.

关键词： high isolation loop antenna co-polarized image theory