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         性別比 在 人口學與計劃生育 分類中 的翻譯結果: 查詢用時:0.042秒
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        sex ratio
      First, in some clonal species, sexual reproduction and sex ratio vary largely among populations.
            
      The sex ratio of the pupae was nearly 1:1 in the woodland samples.
            
      Effects of Elevated Temperature on Sex Ratio in a Population of Hog Slaters (Asellus aquaticus L.)
            
      Seasonal changes in the abundance and sex ratio in the hog slater were monitored in nature throughout the annual cycle.
            
      It was shown that the sex ratio was balanced at a relatively low abundance in the autumn-winter period.
            
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        gender ratio
      For this purpose, 191 healthy Uygur individuals aged above 90 from Hetian area of Xinjiang were recruited, and another 53 persons aged 65-70 from the same nationality, the same region and with the same gender ratio, served as the control group.
            
      Influence of diagnostic classification on gender ratio in schizophrenia
            
      The child gender ratio and the social class of the parents did not differ significantly across groups.
            
      Only the gender difference regarding the gender ratio of dream characters has not been replicated; this finding might be explained by the relationship status (single vs.
            
      The competing gender ratio hypothesis assumes that relative fitness pay-offs, and thus the preferred mating roles, vary and may reverse between matings and predicts that ejaculation strategies co-vary with receiver quality.
            
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        sex ratios
      The sex ratios in the total populations and in individual age groups are unfavorable.
            
      Across all eggs, elevated levels of carbon dioxide significantly feminized sex ratios in both species and also reduced hatching success.
            
      Accumulation of biogenic carbon dioxide from embryonic respiration and other sources is thus likely to affect sex ratios in natural nests under some conditions, perhaps through an effect on some aspects of embryonic pH.
            
      For the same reason, sex ratios during the mating season may be more biased towards males than for whole year estimates (1.7:1 vs.
            
      Males that prior to mating were kept with other males only did not show ES variation with regard to different sex ratios at mating.
            
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        sex proportion
      In our case, spatial variation of age-sex proportion is the unknown variable to be estimated.
            
        其他


      In 1980's the sex ratio of the total population in China and in most.of the provinces ,autonomous regions and municipalities increased obviously, meanwhile it differed greatly in each provincial destrict. these characteristics are closely related with natural growth and mechanical increase of population in China .and the main cause is the change of sex ratio at birth. The ratio at birth in China "and in most of the provinces, autonomous regions and municipalities, except Shanghai . Anhui.Guizhou .Qinghai,Xinjiang,rose...

      In 1980's the sex ratio of the total population in China and in most.of the provinces ,autonomous regions and municipalities increased obviously, meanwhile it differed greatly in each provincial destrict. these characteristics are closely related with natural growth and mechanical increase of population in China .and the main cause is the change of sex ratio at birth. The ratio at birth in China "and in most of the provinces, autonomous regions and municipalities, except Shanghai . Anhui.Guizhou .Qinghai,Xinjiang,rose in varying degrees from 1981 to 1989.The sex ratio of China has been a little higher for a long time. Undoubtedly,its increase has bad effect on finding partner's in marriage to male. Now this phenomenon is not common in China. But it is very eminent in western rural areas. If appropriate policies for decreasing sex ratio at bitrh are not taken.this problem will become more serious.

      本文根據有關資料,討論了80年代我國人口性別比的變動特點及其省區差異,認為我國人口性別比上升的主要原因是出生性別比的變化,最后分析了人口性別比上升對我國男性婚姻的影響。

      The rural economic reform has brought about a range of changes in demand for children of the Chinese peasants. This paper presents the findings from a survey in some rural areas of Zhejiang Province on the changes in fertility preference brought about by the improvement in rural women's status,and in recognition of the equal importance of the girls and boys in rural production and family support for the elderly. However, there is still a marked deviation from the moderm fertility pattern "fewer and later births...

      The rural economic reform has brought about a range of changes in demand for children of the Chinese peasants. This paper presents the findings from a survey in some rural areas of Zhejiang Province on the changes in fertility preference brought about by the improvement in rural women's status,and in recognition of the equal importance of the girls and boys in rural production and family support for the elderly. However, there is still a marked deviation from the moderm fertility pattern "fewer and later births without sex preference".

      農村經濟改革引起了中國農民生育需求發生了許多變化,以浙江省部分農村為例,隨著婦女地位,尤其是年輕婦女的經濟地位的提高,改變了人們對男孩的偏好,認識到在農村生產、生活和家庭養老中,女孩也同男孩一樣發揮著重要作用。但是,在現實生活的需求發生變化的同時,人們精神生活的需求并沒隨著發生根本的變化,生男孩仍然是農民精神上的最大滿足,這是近年來中國部分農村地區出生性別比偏高的根本原因。中國農民離“少生、晚生、生男生女都一樣”的現代生育模式還有相當的距離,生育觀念的現代化,既要求物質上的現代化,也要求精神上的現代化。

      Using data from the 1990 fourth population census and the 1995 one' percent population sample survey, this paper examines the changes as well as the socio-economic differentials in sex ratio at birth in Beijing. Most probably the principal cause of the increased sex ratio at birth in Beijing in the context of very low fertility is the selectivity of childbearing.

      本文用1995年北京市1%人口抽樣調查數據和1990年第四次人口普查數據,對北京市統計的出生性別比的變化進行了比較分析。分析指出,90年代以來,北京市統計的出生性別比呈上升趨勢。這主要是其中一孩性別比上升的緣故。在低生育率的環境下,選擇性生育有可能是統計的出生性別比上升的主要原因。轉變人們的傳統觀念,創造男女平等的社會條件,是使出生性別比恢復正常的關鍵所在。

       
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