BACKGROUND Post-stroke depression(PSD),a condition commonly developed in patients with chronic stroke,impairs both functional rehabilitation and daily living.AIM To comprehensively analyze PSD contributors in chronic ...BACKGROUND Post-stroke depression(PSD),a condition commonly developed in patients with chronic stroke,impairs both functional rehabilitation and daily living.AIM To comprehensively analyze PSD contributors in chronic phase stroke and construct a precise nomogram.METHODS Two hundred patients with chronic stroke admitted in over 7 years(January 2017 to January 2024),were enrolled and categorized into the PSD group(n=96)and the non-PSD(NPSD)group(n=104).Demographic characteristics,clinicopathological data,and biochemical indicators were collected and analyzed by univariate analysis.Significant predictors identified in the univariate analysis were subsequently incorporated into a binary logistic regression model to assess their independent effects on PSD risk.The discriminative ability/calibration of the developed PSD prediction nomogram was assessed.RESULTS Compared with the NPSD group,the PSD group included a higher proportion of patients aged≥60 years,divorced/widowed,with an education level below senior high school,presenting with≥2 comorbidities,exhibiting severe neurological impairment,and having multiple lesions.Additionally,the PSD group showed significantly higher neutrophil-to-lymphocyte ratio(NLR)and platelet-tolymphocyte ratio(PLR)than the NPSD group.After assigning values to significant predictors,multivariate analysis indicated that educational level(P=0.046),NLR(P<0.001),and PLR(P<0.001)were independently associated with PSD in patients with chronic stroke.The developed nomogram exhibited favorable discrimination performance.The nomogram's calibration remained accurate for high-risk stratification but displayed modest inconsistencies in lowand middle-risk categories.CONCLUSION Education level,NLR,and PLR independently contribute to PSD in patients with chronic stroke.The constructed nomogram effectively predicts PSD risk within the range of 0.10-0.90,presenting a valuable tool for clinical monitoring and risk assessment of PSD in patients with chronic stroke.展开更多
The rapidly increasing scientific interest in 3D-printed high-entropy alloys(HEAs)necessitates the understanding of their deformation mechanisms.Here,we present the grain rotation behavior of a nearly equiatomic CrMnF...The rapidly increasing scientific interest in 3D-printed high-entropy alloys(HEAs)necessitates the understanding of their deformation mechanisms.Here,we present the grain rotation behavior of a nearly equiatomic CrMnFeCoNi HEA fabricated with laser-beam powder bed fusion via quasi in-situ electron backscatter diffraction(EBSD)observations during compressive deformation.The rotation paths of grains can be predicted via a new lattice reorientation factor(m_(A)),defined as the average of primary and secondary slip Schmid factors.The grains that initially have their〈111〉directions oriented close to the loading direction with low-to-intermediate m_(A)values tend to rotate towards the〈101〉pole.The grains initially oriented in the center of inverse pole figures with high m_(A)values develop multiple rotation paths pointing away from the〈001〉pole.The cube-oriented grains with their〈001〉directions close to the loading direction undergo face-centered cubic(FCC)-to-hexagonal close-packed(HCP)phase transformation due to the activation of octahedral slip involving multiple slip systems.This transformation can be well elucidated via a modified parameter,defined as the average of four maximum Schmid factors on each of four{111}slip/twinning planes in FCC crystals.The findings provide new insights into the underlying mechanisms for deformation-induced grain rotation and phase transformation,and help pave the way for developing advanced HEAs via transformation-induced plasticity.展开更多
Ribosomal RNA(rRNA)synthesis is intricately tied to cellular growth and proliferation.Basic fibroblast growth factor(FGF2),a pivotal factor for bone marrow mesenchymal stem cells(BMSCs),can stimulates rRNA transcripti...Ribosomal RNA(rRNA)synthesis is intricately tied to cellular growth and proliferation.Basic fibroblast growth factor(FGF2),a pivotal factor for bone marrow mesenchymal stem cells(BMSCs),can stimulates rRNA transcription,though the underlying mechanism remains unknown.Here,we demonstrate that the cytoplasm-nucleus translocation of FGF2 is determined by the stable nuclear localization motif.Meanwhile,the nuclear FGF2 regulates rRNA expression and BMSCs proliferation via phase separation.Next,through FGF2 related epigenomics and 3D genomes analysis,we identified chromatin architectures during BMSCs differentiation and aging.In the process,topologically associating domains(TADs)and chromatin loops profiling revealed the attenuated genomic interaction among proximal chromosomes 13,14,15,21,and 22,where phase-separated FGF2 facilitates rDNA transcription depend on specific super-enhancers(SEs).Furthermore,we validated that FGF2 orchestrates rDNA chromatin architecture in coordination with STAT5.Together,these findings underscore the pivotal role of FGF2 in rDNA chromatin architectures,which determines BMSCs cell fate.展开更多
Using a field equation with a phase factor, a universal analytic potential-energy function applied to the interactions between diatoms or molecules is derived, and five kinds of potential curves of common shapes are o...Using a field equation with a phase factor, a universal analytic potential-energy function applied to the interactions between diatoms or molecules is derived, and five kinds of potential curves of common shapes are obtained adjusting the phase factors. The linear thermal expansion coefficients and Young's moduli of eleven kinds of face-centered cubic (fcc) metals - Al, Cu, Ag, etc. are calculated using the potential-energy function; the computational results are quite consistent with experimental values. Moreover, an analytic relation between the linear thermal expansion coefficients and Young's moduli of fcc metals is given using the potential-energy function. Finally, the force constants of fifty-five kinds of diatomic moleculars with low excitation state are computed using this theory, and they are quite consistent with RKR (Rydberg-Klein-Rees) experimental values.展开更多
Estimating the quality factor Q accurately signifi cantly improves the seismic data resolution and reservoir characterization.The commonly used log-spectral ratio method uses least-squares fi tting to obtain Q values ...Estimating the quality factor Q accurately signifi cantly improves the seismic data resolution and reservoir characterization.The commonly used log-spectral ratio method uses least-squares fi tting to obtain Q values and involves only the amplitude information of seismic data while neglecting phase information.This paper proposes a joint interval Q inversion method based on the spectral ratio method and employs both amplitude and phase information to improve the accuracy.Based on the assumption that Q is independent of frequency,the nonlinear relation between the Q value and the two types of information is jointly used to construct an objective function,which clarifies the quantitative relation between amplitude spectrum,phase information,and Q value.The interval Q value can be inverted by calculating the minimum value of the objective function.The model test exhibits that the proposed method has higher precision and stability than the spectral ratio method;furthermore,the application to field data demonstrates that accurate Q inversion results are consistent with reservoir characteristics.展开更多
The effect of rare earth （RE） on bainite trans- formation mechanism is not yet unified in the academia. Therefore, further studying the effect of RE on bainite transformation mechanism will have important guiding si...The effect of rare earth （RE） on bainite trans- formation mechanism is not yet unified in the academia. Therefore, further studying the effect of RE on bainite transformation mechanism will have important guiding significance for the development of bainite steels. In this paper, using differential dilatometer （DIL805A/D）, heat treatment was performed and C-curve was drawn. The effect of phase structure factor on bainite transformation under two different fractions of RE in Si-Mn-Mo bainite steels was investigated by the empirical electron theory （EET） of solids, molecules, dilatometry, and metallogra- phy. Experimental results show that RE makes Fe-C- RE segregation structural unit of Si-Mn-Mo bainite steels increase, i.e., the values of phase structure factor （na, FDC） increase, and delay bainite transformation due to the drag effect resulting from the segregation of RE ferrite island interphase and the retardation of RE to carbon diffusion in Si-Mn-Mo bainite steels. Beside this, C-curve is shifted to right and down, and microstructures of bainite ferrite and substructures are finer.展开更多
AIM:To investigate the mechanisms involved in a possible modulator role of interleukin(IL) -6 signalling on CYR61-CTGF-NOV(CCN) 2/connective tissue growth factor(CTGF) expression in hepatocytes(PC) and to look for a r...AIM:To investigate the mechanisms involved in a possible modulator role of interleukin(IL) -6 signalling on CYR61-CTGF-NOV(CCN) 2/connective tissue growth factor(CTGF) expression in hepatocytes(PC) and to look for a relation between serum concentrations of these two parameters in patients with acute inflammation. METHODS:Expression of CCN2/CTGF,p-STAT3,p-Smad 3/1 and p-Smad2 was examined in primary freshly isolated rat or cryo-preserved human PC exposed to various stimuli by Western blotting,electrophoretic mobility shift assay(EMSA) ,reporter-gene-assays and reversetranscriptase polymerase chain reaction. RESULTS:IL-6 strongly down-regulated CCN2/CTGF protein and mRNA expression in PC,enhanceable by extracellular presence of the soluble IL-6 receptor gp80,and supported by an inverse relation between IL-6 and CCN2/CTGF concentrations in patients'sera.The inhi-bition of TGFβ1 driven CCN2/CTGF expression by IL-6 did not involve a modulation of Smad2(and Smad1/3) signalling.However,the STAT3 SH2 domain binding peptide,a selective inhibitor of STAT3 DNA binding activity,counteracted the inhibitory effect of IL-6 on CCN2/CTGF expression much more pronounced than pyrrolidine-dithiocarbamate,an inhibitor primarily of STAT3 phosphorylation.An EMSA confirmed STAT3 binding to the proposed proximal STAT binding site in the CCN2/CTGF promoter. CONCLUSION:CCN2/CTGF is identified as a hepatocellular negative acute phase protein which is downregulated by IL-6 via the STAT3 pathway through interaction on the DNA binding level.展开更多
In this paper, a new partial transmit sequence（PTS）scheme with low computational complexity is proposed for the problems of high computational complexity in the conventional PTS method. By analyzing the relationship...In this paper, a new partial transmit sequence（PTS）scheme with low computational complexity is proposed for the problems of high computational complexity in the conventional PTS method. By analyzing the relationship of candidate sequences in the PTS method under the interleaved partition method, it has been discovered that some candidate sequences generated by phase factor sequences have the same peak average power ratio（PAPR）. Hence, phase factor sequences can be optimized to reduce their searching times. Then, the computational process of generating candidate sequences can be simplified by improving the utilization of data and minimizing the calculations of complex multiplication. The performance analysis shows that, compared with the conventional PTS scheme, the proposed approach significantly decreases the computational complexity and has no loss of PAPR performance.展开更多
Objective: To establish a new assay for platelet-activating factor (PAF), to compare it with bio-assay; and to discuss its significance in some elderly people diseases such as cerebral infarction and coronary heart di...Objective: To establish a new assay for platelet-activating factor (PAF), to compare it with bio-assay; and to discuss its significance in some elderly people diseases such as cerebral infarction and coronary heart disease. Methods: To measure PAF levels in 100 controls, 23 elderly patients with cerebral infarction and 65 cases with coronary heart disease by reversed phase high-performance liquid chromatographic technique (rHPLC). Results:rHPLC is more convenient, sensitive,specific, and less confusing, compared with bio-assay. The level of plasma PAF in patients with cerebral infarction was higher than that in the controls (P<0.01), and in patients with coronary heart disease. Conclusion: Detection of PAF with rHPLC is more reliable and more accurate. The new assay has important significance in PAF research.展开更多
An intelligent power factor correction scheme is presented for three phase low power factor loads. This new scheme is able to perform individual phase sensing of parameters by monitoring at all times to sense a change...An intelligent power factor correction scheme is presented for three phase low power factor loads. This new scheme is able to perform individual phase sensing of parameters by monitoring at all times to sense a change in system parameters and affects individual phase correction by applying the exact amount of reactive components needed for each phase, and can also reduce negative sequence current caused by the load to improve system balance. An optimization criterion is used for the proper calculation of reactive power steps in a power compensation installation of capacitor banks. The criterion is enabled by sampling measurements performed on the electrical plant examined within specific interval of time.展开更多
The influencing factors for liquid phase catalytic oxidation of mine gas to methanol(in form of CH3COOCH3) are studied using the self-established experimental apparatus. The results show that CH3COOCH3(target product)...The influencing factors for liquid phase catalytic oxidation of mine gas to methanol(in form of CH3COOCH3) are studied using the self-established experimental apparatus. The results show that CH3COOCH3(target product) is obtained by using CH3COOH as reaction solvent, and the yield of target product increases with the increasing of reaction temperature, gas pressure and reaction time. In the mine gas-Pd(OAc)2-CH3COOH system, the yield of CH3COOCH3 increases with the increasing of addition of Pd(OAc)2 which is redox catalyst for mine gas conversion. The yield of CH3COOCH3 will be greatly improved by composite additional oxidant which is obtained by equimolar mix of p-benzoquinone with NO2.展开更多
BACKGROUND Uncontrolled growth and loss of control over basic metabolic functions,leading to invasive proliferation and metastases,are the salient traits of malignant tumors in general and colorectal cancer in particu...BACKGROUND Uncontrolled growth and loss of control over basic metabolic functions,leading to invasive proliferation and metastases,are the salient traits of malignant tumors in general and colorectal cancer in particular.Invasion and metastases hinder effective tumor treatment.While surgical techniques and radiotherapy can be used to remove tumor focus,only chemotherapy can eliminate dispersed neoplastic cells.However,the efficacy of the latter method is limited in the advanced stages of the disease.Therefore,recognition of the mechanisms involved in neoplastic cell spreading is indispensable for developing effective therapies.AIM To use a number of biomarkers involved in cancer progression and identify a panel that could be used for effective early diagnosis.METHODS We recruited 185 patients with colorectal adenocarcinoma(98 men,87 women with median age 63).Thirty-five healthy controls were sex and age-matched.Dukes’staging was as follows:A=22,B=52,C=72,D=39.We analyzed patients'blood serum before surgery.We determined:(1)Cathepsin B(CB)with Barrett's method(fluorogenic substrate);(2)Leukocytic elastase(LE)in a complex with alpha 1 trypsin inhibitor(AAT)using the immunoenzymatic MERCK test;(3)Total sialic acid(TSA)with the colorimetric periodate-resorcinol method;(4)Lipid-bound sialic acid(LASA)with the colorimetric Taut's method;and(5)The antitrypsin activity(ATA)employing the colorimetric test.RESULTS In patients,the values of the five biochemical parameters were as follows:CB=16.1±8.8 mU/L,LE=875±598μg/L,TSA=99±31 mg%,LASA=0.68±0.33 mg%,and ATA=3211±1504 U/mL.Except for LASA,they were significantly greater than those of controls:CB=11.4±6.5 mU/L,LE=379±187μg/L,TSA=71.4±15.1 mg%,LASA=0.69±0.28 mg%,and ATA=2016±690 U/mL.For CB and LASA,the differences between the four Dukes’stages and controls were not statistically significant.The inter-stage differences for CB and LASA were also absent.The receiver operating characteristic(ROC)analysis revealed the potential diagnostic value of CB,TSA,and ATA.The area under ROC,sensitivity,and specificity for these three parameters were:0.85,72%,90%;0.75,66%,77%;and 0.77,63%,84%,respectively.The sensitivity and specificity for the threeparameter panel CB-TSA-ATA were equal to 88.2%and 100%,respectively.CONCLUSION The increased value of CB,TSA,and ATA parameters are associated with tumor biology,invasion,and metastasis of colorectal cancer.The presented evidence suggests the potential value of the CB-TSA-ATA biochemical marker panel in early diagnostics.展开更多
Generalized solutions of the standard gauge transformation equations are presented and discussed in physical terms. They go beyond the usual Dirac phase factors and they exhibit nonlocal quantal behavior, with the wel...Generalized solutions of the standard gauge transformation equations are presented and discussed in physical terms. They go beyond the usual Dirac phase factors and they exhibit nonlocal quantal behavior, with the well-known Relativistic Causality of classical fields affecting directly the phases of wavefunctions in the Schr?dinger Picture. These nonlocal phase behaviors, apparently overlooked in path-integral approaches, give a natural account of the dynamical nonlocality character of the various (even static) Aharonov-Bohm phenomena, while at the same time they seem to respect Causality. For particles passing through nonvanishing magnetic or electric fields they lead to cancellations of Aharonov-Bohm phases at the observation point, generalizing earlier semiclassical experimental observations (of Werner & Brill) to delocalized (spread-out) quantum states. This leads to a correction of previously unnoticed sign-errors in the literature, and to a natural explanation of the deeper reason why certain time-dependent semiclassical arguments are consistent with static results in purely quantal Aharonov-Bohm configurations. These nonlocalities also provide a remedy for misleading results propagating in the literature (concerning an uncritical use of Dirac phase factors, that persists since the time of Feynman’s work on path integrals). They are shown to conspire in such a way as to exactly cancel the instantaneous Aharonov-Bohm phase and recover Relativistic Causality in earlier “paradoxes” (such as the van Kampen thought-experiment), and to also complete Peshkin’s discussion of the electric Aharonov-Bohm effect in a causal manner. The present formulation offers a direct way to address time-dependent single- vs double-slit experiments and the associated causal issues—issues that have recently attracted attention, with respect to the inability of current theories to address them.展开更多
Suppose the degenerate states wave function of a Hamitonian operatorHis accompanied by a natural phase factor, then we can own it to the role of sometransformation generator played by some non--degenerate Hermitian op...Suppose the degenerate states wave function of a Hamitonian operatorHis accompanied by a natural phase factor, then we can own it to the role of sometransformation generator played by some non--degenerate Hermitian operator containedin the complete set of conserved mechanical quantities. When this idea is extended tothe spece coordinated by parameters and the momentum--like operator is introduced,thenon-Abelian Berry phose factor of degenerate wave function can be easily gotter afterthe system evolves along a closed adiabatic curve.展开更多
BACKGROUND Studies with large size samples on the liver histological changes of indeterminate phase chronic hepatitis B(CHB)patients were not previously conducted.AIM To assess the liver histological changes in the in...BACKGROUND Studies with large size samples on the liver histological changes of indeterminate phase chronic hepatitis B(CHB)patients were not previously conducted.AIM To assess the liver histological changes in the indeterminate phase CHB patients using liver biopsy.METHODS The clinical and laboratory data of 1532 untreated CHB patients were collected,and all patients had least once liver biopsy from January 2015 to December 2021.The significant differences among different phases of CHB infection were compared with t-test,and the risk factors of significant liver histological changes were analyzed by the multivariate logistic regression analysis.RESULTS Among 1532 untreated CHB patients,814(53.13%)patients were in the indeterminate phase.Significant liver histological changes(defined as biopsy score≥G2 and/or≥S2)were found in 488/814(59.95%)CHB patients in the indete-rminate phase.Significant liver histological changes were significant differences among different age,platelets(PLTs),and alanine aminotransferase(ALT)subgroup in indeterminate patient.Multivariate logistic regression analysis indicated that age≥40 years old[adjust odd risk(aOR),1.44;95%confidence interval(CI):1.06-1.97;P=0.02],PLTs≤150×10^(9)/L(aOR,2.99;95%CI:1.85-4.83;P<0.0001),and ALT≥upper limits of normal(aOR,1.48;95%CI:1.08,2.05,P=0.0163)were independent risk factors for significant liver histological changes in CHB patients in the indeterminate phase.CONCLUSION Our results suggested that significant liver histological changes were not rare among the untreated CHB patients in indeterminate phase,and additional strategies are urgently required for the management of these patients.展开更多
Finding binary sequences with Large SHG ratios is very important in the field of ultrafast science, biomedical optics, high-resolution microscopy and label-free imaging. In this paper, we have demonstrated the relatio...Finding binary sequences with Large SHG ratios is very important in the field of ultrafast science, biomedical optics, high-resolution microscopy and label-free imaging. In this paper, we have demonstrated the relation between the SHG contrast ratio and the traditional Merit Factor values. And in the light from known results in Merit Factor Problems, we have shown that Legendre Sequences or Jacobi Sequences, are still the best candidates to obtain binary sequences with large SHG contrast ratios. The authors also discussed the SHG behaviors on some sequences obtained from cyclotomic classes over the finite field GF (2l) .展开更多
文摘BACKGROUND Post-stroke depression(PSD),a condition commonly developed in patients with chronic stroke,impairs both functional rehabilitation and daily living.AIM To comprehensively analyze PSD contributors in chronic phase stroke and construct a precise nomogram.METHODS Two hundred patients with chronic stroke admitted in over 7 years(January 2017 to January 2024),were enrolled and categorized into the PSD group(n=96)and the non-PSD(NPSD)group(n=104).Demographic characteristics,clinicopathological data,and biochemical indicators were collected and analyzed by univariate analysis.Significant predictors identified in the univariate analysis were subsequently incorporated into a binary logistic regression model to assess their independent effects on PSD risk.The discriminative ability/calibration of the developed PSD prediction nomogram was assessed.RESULTS Compared with the NPSD group,the PSD group included a higher proportion of patients aged≥60 years,divorced/widowed,with an education level below senior high school,presenting with≥2 comorbidities,exhibiting severe neurological impairment,and having multiple lesions.Additionally,the PSD group showed significantly higher neutrophil-to-lymphocyte ratio(NLR)and platelet-tolymphocyte ratio(PLR)than the NPSD group.After assigning values to significant predictors,multivariate analysis indicated that educational level(P=0.046),NLR(P<0.001),and PLR(P<0.001)were independently associated with PSD in patients with chronic stroke.The developed nomogram exhibited favorable discrimination performance.The nomogram's calibration remained accurate for high-risk stratification but displayed modest inconsistencies in lowand middle-risk categories.CONCLUSION Education level,NLR,and PLR independently contribute to PSD in patients with chronic stroke.The constructed nomogram effectively predicts PSD risk within the range of 0.10-0.90,presenting a valuable tool for clinical monitoring and risk assessment of PSD in patients with chronic stroke.
基金the Natural Sciences and Engineering Research Council of Canada(NSERC),Natural Resources Canada(NRCan),Alberta Innovates,and the National Natural Science Foundation of China(NSFC)(Grant Nos.52271012 and 51871168)for the financial support.
文摘The rapidly increasing scientific interest in 3D-printed high-entropy alloys(HEAs)necessitates the understanding of their deformation mechanisms.Here,we present the grain rotation behavior of a nearly equiatomic CrMnFeCoNi HEA fabricated with laser-beam powder bed fusion via quasi in-situ electron backscatter diffraction(EBSD)observations during compressive deformation.The rotation paths of grains can be predicted via a new lattice reorientation factor(m_(A)),defined as the average of primary and secondary slip Schmid factors.The grains that initially have their〈111〉directions oriented close to the loading direction with low-to-intermediate m_(A)values tend to rotate towards the〈101〉pole.The grains initially oriented in the center of inverse pole figures with high m_(A)values develop multiple rotation paths pointing away from the〈001〉pole.The cube-oriented grains with their〈001〉directions close to the loading direction undergo face-centered cubic(FCC)-to-hexagonal close-packed(HCP)phase transformation due to the activation of octahedral slip involving multiple slip systems.This transformation can be well elucidated via a modified parameter,defined as the average of four maximum Schmid factors on each of four{111}slip/twinning planes in FCC crystals.The findings provide new insights into the underlying mechanisms for deformation-induced grain rotation and phase transformation,and help pave the way for developing advanced HEAs via transformation-induced plasticity.
基金the open research project of State Key Laboratory of Oral Diseases(no.SKLOD2024OF03)the Key Project of Natural Science Research in Anhui Provincial Universities(no.2024AH050683)+1 种基金Anhui Province Outstanding Young Teachers Development Program(no.YQYB2024013)the National Natural Science Foundation of China(no.82201026,82125006).
文摘Ribosomal RNA(rRNA)synthesis is intricately tied to cellular growth and proliferation.Basic fibroblast growth factor(FGF2),a pivotal factor for bone marrow mesenchymal stem cells(BMSCs),can stimulates rRNA transcription,though the underlying mechanism remains unknown.Here,we demonstrate that the cytoplasm-nucleus translocation of FGF2 is determined by the stable nuclear localization motif.Meanwhile,the nuclear FGF2 regulates rRNA expression and BMSCs proliferation via phase separation.Next,through FGF2 related epigenomics and 3D genomes analysis,we identified chromatin architectures during BMSCs differentiation and aging.In the process,topologically associating domains(TADs)and chromatin loops profiling revealed the attenuated genomic interaction among proximal chromosomes 13,14,15,21,and 22,where phase-separated FGF2 facilitates rDNA transcription depend on specific super-enhancers(SEs).Furthermore,we validated that FGF2 orchestrates rDNA chromatin architecture in coordination with STAT5.Together,these findings underscore the pivotal role of FGF2 in rDNA chromatin architectures,which determines BMSCs cell fate.
基金This work was supported by the National Natural Science Foundation of China (No. 40274044).
文摘Using a field equation with a phase factor, a universal analytic potential-energy function applied to the interactions between diatoms or molecules is derived, and five kinds of potential curves of common shapes are obtained adjusting the phase factors. The linear thermal expansion coefficients and Young's moduli of eleven kinds of face-centered cubic (fcc) metals - Al, Cu, Ag, etc. are calculated using the potential-energy function; the computational results are quite consistent with experimental values. Moreover, an analytic relation between the linear thermal expansion coefficients and Young's moduli of fcc metals is given using the potential-energy function. Finally, the force constants of fifty-five kinds of diatomic moleculars with low excitation state are computed using this theory, and they are quite consistent with RKR (Rydberg-Klein-Rees) experimental values.
基金supported by the National Natural Science Foundation of China(41774137)the National Grand Project for Science and Technology(2017ZX05032003)the Fundamental Research Funds for the Central Universities(19CX02002A)
文摘Estimating the quality factor Q accurately signifi cantly improves the seismic data resolution and reservoir characterization.The commonly used log-spectral ratio method uses least-squares fi tting to obtain Q values and involves only the amplitude information of seismic data while neglecting phase information.This paper proposes a joint interval Q inversion method based on the spectral ratio method and employs both amplitude and phase information to improve the accuracy.Based on the assumption that Q is independent of frequency,the nonlinear relation between the Q value and the two types of information is jointly used to construct an objective function,which clarifies the quantitative relation between amplitude spectrum,phase information,and Q value.The interval Q value can be inverted by calculating the minimum value of the objective function.The model test exhibits that the proposed method has higher precision and stability than the spectral ratio method;furthermore,the application to field data demonstrates that accurate Q inversion results are consistent with reservoir characteristics.
基金financially supported by the Technology Innovation Fund of the Ministry of Science and Technology of China(No.04C26215200858)
文摘The effect of rare earth （RE） on bainite trans- formation mechanism is not yet unified in the academia. Therefore, further studying the effect of RE on bainite transformation mechanism will have important guiding significance for the development of bainite steels. In this paper, using differential dilatometer （DIL805A/D）, heat treatment was performed and C-curve was drawn. The effect of phase structure factor on bainite transformation under two different fractions of RE in Si-Mn-Mo bainite steels was investigated by the empirical electron theory （EET） of solids, molecules, dilatometry, and metallogra- phy. Experimental results show that RE makes Fe-C- RE segregation structural unit of Si-Mn-Mo bainite steels increase, i.e., the values of phase structure factor （na, FDC） increase, and delay bainite transformation due to the drag effect resulting from the segregation of RE ferrite island interphase and the retardation of RE to carbon diffusion in Si-Mn-Mo bainite steels. Beside this, C-curve is shifted to right and down, and microstructures of bainite ferrite and substructures are finer.
文摘AIM:To investigate the mechanisms involved in a possible modulator role of interleukin(IL) -6 signalling on CYR61-CTGF-NOV(CCN) 2/connective tissue growth factor(CTGF) expression in hepatocytes(PC) and to look for a relation between serum concentrations of these two parameters in patients with acute inflammation. METHODS:Expression of CCN2/CTGF,p-STAT3,p-Smad 3/1 and p-Smad2 was examined in primary freshly isolated rat or cryo-preserved human PC exposed to various stimuli by Western blotting,electrophoretic mobility shift assay(EMSA) ,reporter-gene-assays and reversetranscriptase polymerase chain reaction. RESULTS:IL-6 strongly down-regulated CCN2/CTGF protein and mRNA expression in PC,enhanceable by extracellular presence of the soluble IL-6 receptor gp80,and supported by an inverse relation between IL-6 and CCN2/CTGF concentrations in patients'sera.The inhi-bition of TGFβ1 driven CCN2/CTGF expression by IL-6 did not involve a modulation of Smad2(and Smad1/3) signalling.However,the STAT3 SH2 domain binding peptide,a selective inhibitor of STAT3 DNA binding activity,counteracted the inhibitory effect of IL-6 on CCN2/CTGF expression much more pronounced than pyrrolidine-dithiocarbamate,an inhibitor primarily of STAT3 phosphorylation.An EMSA confirmed STAT3 binding to the proposed proximal STAT binding site in the CCN2/CTGF promoter. CONCLUSION:CCN2/CTGF is identified as a hepatocellular negative acute phase protein which is downregulated by IL-6 via the STAT3 pathway through interaction on the DNA binding level.
基金supported by the National Natural Science Foundation of China(6167309361370152)the Science and Technology Project of Shenyang(F16-205-1-01)
文摘In this paper, a new partial transmit sequence（PTS）scheme with low computational complexity is proposed for the problems of high computational complexity in the conventional PTS method. By analyzing the relationship of candidate sequences in the PTS method under the interleaved partition method, it has been discovered that some candidate sequences generated by phase factor sequences have the same peak average power ratio（PAPR）. Hence, phase factor sequences can be optimized to reduce their searching times. Then, the computational process of generating candidate sequences can be simplified by improving the utilization of data and minimizing the calculations of complex multiplication. The performance analysis shows that, compared with the conventional PTS scheme, the proposed approach significantly decreases the computational complexity and has no loss of PAPR performance.
文摘Objective: To establish a new assay for platelet-activating factor (PAF), to compare it with bio-assay; and to discuss its significance in some elderly people diseases such as cerebral infarction and coronary heart disease. Methods: To measure PAF levels in 100 controls, 23 elderly patients with cerebral infarction and 65 cases with coronary heart disease by reversed phase high-performance liquid chromatographic technique (rHPLC). Results:rHPLC is more convenient, sensitive,specific, and less confusing, compared with bio-assay. The level of plasma PAF in patients with cerebral infarction was higher than that in the controls (P<0.01), and in patients with coronary heart disease. Conclusion: Detection of PAF with rHPLC is more reliable and more accurate. The new assay has important significance in PAF research.
文摘An intelligent power factor correction scheme is presented for three phase low power factor loads. This new scheme is able to perform individual phase sensing of parameters by monitoring at all times to sense a change in system parameters and affects individual phase correction by applying the exact amount of reactive components needed for each phase, and can also reduce negative sequence current caused by the load to improve system balance. An optimization criterion is used for the proper calculation of reactive power steps in a power compensation installation of capacitor banks. The criterion is enabled by sampling measurements performed on the electrical plant examined within specific interval of time.
基金supported jointly by the National Natural Science Foundation of China(No.51004045)Scientific Research Fund of Education Department of Heilongjiang Province,China(No.12511481)
文摘The influencing factors for liquid phase catalytic oxidation of mine gas to methanol(in form of CH3COOCH3) are studied using the self-established experimental apparatus. The results show that CH3COOCH3(target product) is obtained by using CH3COOH as reaction solvent, and the yield of target product increases with the increasing of reaction temperature, gas pressure and reaction time. In the mine gas-Pd(OAc)2-CH3COOH system, the yield of CH3COOCH3 increases with the increasing of addition of Pd(OAc)2 which is redox catalyst for mine gas conversion. The yield of CH3COOCH3 will be greatly improved by composite additional oxidant which is obtained by equimolar mix of p-benzoquinone with NO2.
文摘BACKGROUND Uncontrolled growth and loss of control over basic metabolic functions,leading to invasive proliferation and metastases,are the salient traits of malignant tumors in general and colorectal cancer in particular.Invasion and metastases hinder effective tumor treatment.While surgical techniques and radiotherapy can be used to remove tumor focus,only chemotherapy can eliminate dispersed neoplastic cells.However,the efficacy of the latter method is limited in the advanced stages of the disease.Therefore,recognition of the mechanisms involved in neoplastic cell spreading is indispensable for developing effective therapies.AIM To use a number of biomarkers involved in cancer progression and identify a panel that could be used for effective early diagnosis.METHODS We recruited 185 patients with colorectal adenocarcinoma(98 men,87 women with median age 63).Thirty-five healthy controls were sex and age-matched.Dukes’staging was as follows:A=22,B=52,C=72,D=39.We analyzed patients'blood serum before surgery.We determined:(1)Cathepsin B(CB)with Barrett's method(fluorogenic substrate);(2)Leukocytic elastase(LE)in a complex with alpha 1 trypsin inhibitor(AAT)using the immunoenzymatic MERCK test;(3)Total sialic acid(TSA)with the colorimetric periodate-resorcinol method;(4)Lipid-bound sialic acid(LASA)with the colorimetric Taut's method;and(5)The antitrypsin activity(ATA)employing the colorimetric test.RESULTS In patients,the values of the five biochemical parameters were as follows:CB=16.1±8.8 mU/L,LE=875±598μg/L,TSA=99±31 mg%,LASA=0.68±0.33 mg%,and ATA=3211±1504 U/mL.Except for LASA,they were significantly greater than those of controls:CB=11.4±6.5 mU/L,LE=379±187μg/L,TSA=71.4±15.1 mg%,LASA=0.69±0.28 mg%,and ATA=2016±690 U/mL.For CB and LASA,the differences between the four Dukes’stages and controls were not statistically significant.The inter-stage differences for CB and LASA were also absent.The receiver operating characteristic(ROC)analysis revealed the potential diagnostic value of CB,TSA,and ATA.The area under ROC,sensitivity,and specificity for these three parameters were:0.85,72%,90%;0.75,66%,77%;and 0.77,63%,84%,respectively.The sensitivity and specificity for the threeparameter panel CB-TSA-ATA were equal to 88.2%and 100%,respectively.CONCLUSION The increased value of CB,TSA,and ATA parameters are associated with tumor biology,invasion,and metastasis of colorectal cancer.The presented evidence suggests the potential value of the CB-TSA-ATA biochemical marker panel in early diagnostics.
文摘Generalized solutions of the standard gauge transformation equations are presented and discussed in physical terms. They go beyond the usual Dirac phase factors and they exhibit nonlocal quantal behavior, with the well-known Relativistic Causality of classical fields affecting directly the phases of wavefunctions in the Schr?dinger Picture. These nonlocal phase behaviors, apparently overlooked in path-integral approaches, give a natural account of the dynamical nonlocality character of the various (even static) Aharonov-Bohm phenomena, while at the same time they seem to respect Causality. For particles passing through nonvanishing magnetic or electric fields they lead to cancellations of Aharonov-Bohm phases at the observation point, generalizing earlier semiclassical experimental observations (of Werner & Brill) to delocalized (spread-out) quantum states. This leads to a correction of previously unnoticed sign-errors in the literature, and to a natural explanation of the deeper reason why certain time-dependent semiclassical arguments are consistent with static results in purely quantal Aharonov-Bohm configurations. These nonlocalities also provide a remedy for misleading results propagating in the literature (concerning an uncritical use of Dirac phase factors, that persists since the time of Feynman’s work on path integrals). They are shown to conspire in such a way as to exactly cancel the instantaneous Aharonov-Bohm phase and recover Relativistic Causality in earlier “paradoxes” (such as the van Kampen thought-experiment), and to also complete Peshkin’s discussion of the electric Aharonov-Bohm effect in a causal manner. The present formulation offers a direct way to address time-dependent single- vs double-slit experiments and the associated causal issues—issues that have recently attracted attention, with respect to the inability of current theories to address them.
文摘Suppose the degenerate states wave function of a Hamitonian operatorHis accompanied by a natural phase factor, then we can own it to the role of sometransformation generator played by some non--degenerate Hermitian operator containedin the complete set of conserved mechanical quantities. When this idea is extended tothe spece coordinated by parameters and the momentum--like operator is introduced,thenon-Abelian Berry phose factor of degenerate wave function can be easily gotter afterthe system evolves along a closed adiabatic curve.
基金Supported by Construction of Key Medical Disciplines in Shenzhen,No.SZXK076.
文摘BACKGROUND Studies with large size samples on the liver histological changes of indeterminate phase chronic hepatitis B(CHB)patients were not previously conducted.AIM To assess the liver histological changes in the indeterminate phase CHB patients using liver biopsy.METHODS The clinical and laboratory data of 1532 untreated CHB patients were collected,and all patients had least once liver biopsy from January 2015 to December 2021.The significant differences among different phases of CHB infection were compared with t-test,and the risk factors of significant liver histological changes were analyzed by the multivariate logistic regression analysis.RESULTS Among 1532 untreated CHB patients,814(53.13%)patients were in the indeterminate phase.Significant liver histological changes(defined as biopsy score≥G2 and/or≥S2)were found in 488/814(59.95%)CHB patients in the indete-rminate phase.Significant liver histological changes were significant differences among different age,platelets(PLTs),and alanine aminotransferase(ALT)subgroup in indeterminate patient.Multivariate logistic regression analysis indicated that age≥40 years old[adjust odd risk(aOR),1.44;95%confidence interval(CI):1.06-1.97;P=0.02],PLTs≤150×10^(9)/L(aOR,2.99;95%CI:1.85-4.83;P<0.0001),and ALT≥upper limits of normal(aOR,1.48;95%CI:1.08,2.05,P=0.0163)were independent risk factors for significant liver histological changes in CHB patients in the indeterminate phase.CONCLUSION Our results suggested that significant liver histological changes were not rare among the untreated CHB patients in indeterminate phase,and additional strategies are urgently required for the management of these patients.
文摘Finding binary sequences with Large SHG ratios is very important in the field of ultrafast science, biomedical optics, high-resolution microscopy and label-free imaging. In this paper, we have demonstrated the relation between the SHG contrast ratio and the traditional Merit Factor values. And in the light from known results in Merit Factor Problems, we have shown that Legendre Sequences or Jacobi Sequences, are still the best candidates to obtain binary sequences with large SHG contrast ratios. The authors also discussed the SHG behaviors on some sequences obtained from cyclotomic classes over the finite field GF (2l) .
