Theoretical analysis of the fiber-lens TEC （Thermally Expended Core） /Coreless/GRIN （Graded-Index） based on thin lens equivalence Js presented in this paper, On condition that the TEC part adjusts the waist radius...Theoretical analysis of the fiber-lens TEC （Thermally Expended Core） /Coreless/GRIN （Graded-Index） based on thin lens equivalence Js presented in this paper, On condition that the TEC part adjusts the waist radius of an incident Gaussian beam,that the coreless part controlls the space between the beam waist and the thin lens, and that the GRIN part acts as the thin lens with its focal length determined by fiber index distribution parameter g, the analytic expressions of the waist spot size and the working distance of the output Gaussian beam are derived, and the influence of the coreless fiber and the length of the GRIN fiber upon the fiber-lens parameter is discussed based on the numerical simulation results. It is concluded that, if a GRIN style fiber-lens is used as a collimator, the maximum of the spot waist can be up to 80μm and the divergence angle of single-mode optical fiber can be reduced by 8 times. If it is applied to a MEMS device, the maximum working distance can be up to 3 mm.展开更多
Abstract Inter-simple sequence repeat （ISSR） markers were used to determine the genetic variation and genetic differentiation of cultured and wild populations of Trachidermus fasciatus, an endangered catadromous fis...Abstract Inter-simple sequence repeat （ISSR） markers were used to determine the genetic variation and genetic differentiation of cultured and wild populations of Trachidermus fasciatus, an endangered catadromous fish species in China. Six selected primers were used to amplify DNA samples from 85 individuals, and 353 loci were detected. Relatively low genetic diversity was detected in the cultured population （the percentage of polymorphic loci PPL=73.80%, Nei＇s gene diversity h--0.178 2, Shannon information index I=0.276 9）. However, the genetic diversity at the species level was relatively high （PPL-91.78%; h = 0.258 3, I= 0.398 6）. The UPGMA tree grouped together the genotypes almost according to their cultured and wild origin, showing distinct differences in genetic structure between wild and cultured populations. The pairwise F^t values confirmed significant genetic differentiation between wild and cultured samples. The cultivated population seems to be low in genetic diversity as a result of detrimental genetic effects in the captive population. The results suggest that ISSR markers are effective for rapid assessment of the degree of diversity of a population, thus giving important topical information relevant to preserving endangered species.展开更多
We investigated 13940 (6735 male, 7250 female) adult head and facial physical attributes from 19 different Han ethnic groups in 10 southern-China provinces, and calculated 12 head and facial indexes. Indexes were used...We investigated 13940 (6735 male, 7250 female) adult head and facial physical attributes from 19 different Han ethnic groups in 10 southern-China provinces, and calculated 12 head and facial indexes. Indexes were used to analyze the variation of head and facial morphological characteristics with increased age. Results showed that as age increases: (1) Head breadth, minimum frontal breadth, face breadth, interocular breadth, external biocular breadth, lip height, lip thickness, head circumference, auricular height, length-breadth head index, length-height head index, and lip-index values decline significantly in a linear fashion. (2) Nose breadth, mouth breadth, morphological facial height, upper-lip height, physiognomic ear length, physiognomic ear breadth, visor skin-fold, and vertical head-facial index values significantly increase in a linear fashion.展开更多
Objective： Spontaneous intracranial hypotension （SIH） is recognized far more commonly than ever before. Though usually characterized by low cerebrospinal fluid （CSF） pressure, some patients with SIH are observed ...Objective： Spontaneous intracranial hypotension （SIH） is recognized far more commonly than ever before. Though usually characterized by low cerebrospinal fluid （CSF） pressure, some patients with SIH are observed to have normal pressure values. In this study, we aimed to confirm the proportion of patients with normal CSF opening pressure （CSF OP） and explore the factors affecting CSF OP in SIH patients. Methods： We retrospectively reviewed 206 consecutive SIH patients and analyzed their clinical and imaging variables （including demographic data, body mass index （BMI）, duration of symptoms, and brain imaging findings）. Univariate and multiVariate analyses were performed to identify the potential factors affecting CSF OP. Results： In a total of 114 （55.3%） cases the CSF OP was 〈60 mmH2O （1 mmH2O=9.80665 Pa）, in 90 （43.7%） cases it was between 60 and 200 mmH2O, and in 2 （1.0%） cases it was 〉200 mmH2O. Univadate analysis showed that the duration of symptoms （P〈0.001）, BMI （P〈0.001）, and age （P=0.024） were positively correlated with CSF OP. However, multivariate analysis suggested that only the duration of symptoms （P〈0.001） and BMI （P〈0.001） were strongly correlated with CSF OP. A relatively high R2 of 0.681 was obtained for the multivariate model. Conclusions： Our study indicated that in patients without a low CSF OP, a diagnosis of SIH should not be excluded. BMI and the duration of symptoms can influence CSF OP in SIH patients, and other potential factors need further investigation.展开更多
Objective： To systematically evaluate the therapeutic efficacy of tuina therapy for primary insomnia. Methods： Nine Chinese and English databases were searched from the inception to May 2017 to identify randomized c...Objective： To systematically evaluate the therapeutic efficacy of tuina therapy for primary insomnia. Methods： Nine Chinese and English databases were searched from the inception to May 2017 to identify randomized controlled trials （RCTs） studying tuina therapy for insomnia. The enrolled articles were all RCTs with tuina as the monotherapy or major therapy in the experiment group, with clear diagnostic criteria for primary insomnia well recognized worldwide or in China, and Pittsburgh sleep quality index （PSQI） as one of the outcome measures. Two researchers evaluated the risk of bias and quality of the enrolled studies by following Cochrane Handbook version 5.1.0. The meta-analysis was performed by RevMan version 5.3. Results： Eleven studies were included with a total of I 076 participants. The Western medication adopted in the control groups were benzodiazepine receptor agonists. The studies were all assessed as high risk of bias for blinding since blinding method was unable to be performed due to the specificity of tuina therapy; no study reported the support of fund or potential interest conflict, so they were all rated unclear for selective reporting. The meta-analysis showed that compared with other traditional Chinese medicine therapies, tuina worked more effectively in reducing the PSQI score （MD=-4.11〈O, 95% confidence interval （CI） -6.01 to -2.22, P〈0.O001）; compared with oral administration of Western medication, tuina showed more significant efficacy in reducing the PSQI score （MD=-3.42〈0, 95%CI -5.19 to -1.66, P〈0.O001）. Subgroup analysis showed that head tuina alone showed no significant difference compared with oral administration of Western medication regarding the change of PSQI score （MD=-4.19〈O, 95%CI -8.87 to 0.50, P〉0.05）; a combination of head and back tuina could more effectively reduce the PSOJ score compared with oral administration of Western medication （MD=-2.08〈O, 95%CI -3.09 to -1.06, P〈0.O001）. Conclusion： Tuina can produce more significant efficacy in treating primary insomnia compared with other traditional Chinese medicine therapies and oral administration of Western medication, especially the combination of head and back tuina.展开更多
文摘Theoretical analysis of the fiber-lens TEC （Thermally Expended Core） /Coreless/GRIN （Graded-Index） based on thin lens equivalence Js presented in this paper, On condition that the TEC part adjusts the waist radius of an incident Gaussian beam,that the coreless part controlls the space between the beam waist and the thin lens, and that the GRIN part acts as the thin lens with its focal length determined by fiber index distribution parameter g, the analytic expressions of the waist spot size and the working distance of the output Gaussian beam are derived, and the influence of the coreless fiber and the length of the GRIN fiber upon the fiber-lens parameter is discussed based on the numerical simulation results. It is concluded that, if a GRIN style fiber-lens is used as a collimator, the maximum of the spot waist can be up to 80μm and the divergence angle of single-mode optical fiber can be reduced by 8 times. If it is applied to a MEMS device, the maximum working distance can be up to 3 mm.
基金Supported by the Key Laboratory of Freshwater Biodiversity Conservation and Utilization, Ministry of Agriculture (No. LFBCU0713)the Special Research Foundation for Public Welfare Marine Program (No. 200905019-2)
文摘Abstract Inter-simple sequence repeat （ISSR） markers were used to determine the genetic variation and genetic differentiation of cultured and wild populations of Trachidermus fasciatus, an endangered catadromous fish species in China. Six selected primers were used to amplify DNA samples from 85 individuals, and 353 loci were detected. Relatively low genetic diversity was detected in the cultured population （the percentage of polymorphic loci PPL=73.80%, Nei＇s gene diversity h--0.178 2, Shannon information index I=0.276 9）. However, the genetic diversity at the species level was relatively high （PPL-91.78%; h = 0.258 3, I= 0.398 6）. The UPGMA tree grouped together the genotypes almost according to their cultured and wild origin, showing distinct differences in genetic structure between wild and cultured populations. The pairwise F^t values confirmed significant genetic differentiation between wild and cultured samples. The cultivated population seems to be low in genetic diversity as a result of detrimental genetic effects in the captive population. The results suggest that ISSR markers are effective for rapid assessment of the degree of diversity of a population, thus giving important topical information relevant to preserving endangered species.
基金supported by the National Natural Science Foundation of China (30830062)
文摘We investigated 13940 (6735 male, 7250 female) adult head and facial physical attributes from 19 different Han ethnic groups in 10 southern-China provinces, and calculated 12 head and facial indexes. Indexes were used to analyze the variation of head and facial morphological characteristics with increased age. Results showed that as age increases: (1) Head breadth, minimum frontal breadth, face breadth, interocular breadth, external biocular breadth, lip height, lip thickness, head circumference, auricular height, length-breadth head index, length-height head index, and lip-index values decline significantly in a linear fashion. (2) Nose breadth, mouth breadth, morphological facial height, upper-lip height, physiognomic ear length, physiognomic ear breadth, visor skin-fold, and vertical head-facial index values significantly increase in a linear fashion.
文摘Objective： Spontaneous intracranial hypotension （SIH） is recognized far more commonly than ever before. Though usually characterized by low cerebrospinal fluid （CSF） pressure, some patients with SIH are observed to have normal pressure values. In this study, we aimed to confirm the proportion of patients with normal CSF opening pressure （CSF OP） and explore the factors affecting CSF OP in SIH patients. Methods： We retrospectively reviewed 206 consecutive SIH patients and analyzed their clinical and imaging variables （including demographic data, body mass index （BMI）, duration of symptoms, and brain imaging findings）. Univariate and multiVariate analyses were performed to identify the potential factors affecting CSF OP. Results： In a total of 114 （55.3%） cases the CSF OP was 〈60 mmH2O （1 mmH2O=9.80665 Pa）, in 90 （43.7%） cases it was between 60 and 200 mmH2O, and in 2 （1.0%） cases it was 〉200 mmH2O. Univadate analysis showed that the duration of symptoms （P〈0.001）, BMI （P〈0.001）, and age （P=0.024） were positively correlated with CSF OP. However, multivariate analysis suggested that only the duration of symptoms （P〈0.001） and BMI （P〈0.001） were strongly correlated with CSF OP. A relatively high R2 of 0.681 was obtained for the multivariate model. Conclusions： Our study indicated that in patients without a low CSF OP, a diagnosis of SIH should not be excluded. BMI and the duration of symptoms can influence CSF OP in SIH patients, and other potential factors need further investigation.
文摘Objective： To systematically evaluate the therapeutic efficacy of tuina therapy for primary insomnia. Methods： Nine Chinese and English databases were searched from the inception to May 2017 to identify randomized controlled trials （RCTs） studying tuina therapy for insomnia. The enrolled articles were all RCTs with tuina as the monotherapy or major therapy in the experiment group, with clear diagnostic criteria for primary insomnia well recognized worldwide or in China, and Pittsburgh sleep quality index （PSQI） as one of the outcome measures. Two researchers evaluated the risk of bias and quality of the enrolled studies by following Cochrane Handbook version 5.1.0. The meta-analysis was performed by RevMan version 5.3. Results： Eleven studies were included with a total of I 076 participants. The Western medication adopted in the control groups were benzodiazepine receptor agonists. The studies were all assessed as high risk of bias for blinding since blinding method was unable to be performed due to the specificity of tuina therapy; no study reported the support of fund or potential interest conflict, so they were all rated unclear for selective reporting. The meta-analysis showed that compared with other traditional Chinese medicine therapies, tuina worked more effectively in reducing the PSQI score （MD=-4.11〈O, 95% confidence interval （CI） -6.01 to -2.22, P〈0.O001）; compared with oral administration of Western medication, tuina showed more significant efficacy in reducing the PSQI score （MD=-3.42〈0, 95%CI -5.19 to -1.66, P〈0.O001）. Subgroup analysis showed that head tuina alone showed no significant difference compared with oral administration of Western medication regarding the change of PSQI score （MD=-4.19〈O, 95%CI -8.87 to 0.50, P〉0.05）; a combination of head and back tuina could more effectively reduce the PSOJ score compared with oral administration of Western medication （MD=-2.08〈O, 95%CI -3.09 to -1.06, P〈0.O001）. Conclusion： Tuina can produce more significant efficacy in treating primary insomnia compared with other traditional Chinese medicine therapies and oral administration of Western medication, especially the combination of head and back tuina.
