population threshold 中文意思是什麼

population threshold 解釋
粒子數閾值
  • population : n. 1. 人口；人口總數；全體居民；人口的聚居。2. 物的全體[總數]；【生物學】蟲口；種群（量）；群體；族，組，個數；【統計學】對象總體，全域。3. 【物理學】布居；密度。4. 〈罕用語〉殖民。
  • threshold : n. 1. 門檻；入口，門口。2. 【心理學】閾限。3. 界限，限度。4. 【物理學】臨界值，閾。5. 入門，開始，開端。
  1. Heredity modes of 6 traits were studied by analysis of population genetics, by the method of family combination analysis, by the methods of proband ' s sib analysis, segregation analysis, the threshold model of polygenes, and analysis of typical family trees, according to the data of the 72 families. the relative importance between genetic and environmental effect on each character was evaluated by comparing the coherence of twins. gene frequencies of 5 genetic characters, calculated from han group in huhhot, were compared with other groups by u - test so as to study the population or nationality difference in heredity

    採用群體遺傳學分析、家系組合分析法、先證者同胞法、分離分析法及多基因閾值模式分析方法對所得家系資料進行了統計學分析，結合家繫系譜分析探討了上述6項特徵的遺傳方式；通過雙生子一致率的比較，對上述特徵的遺傳與環境效應的相對重要性進行了評價；計算了呼和浩特市漢族群體5對遺傳性狀的基因頻率，採用u檢驗方法與相關文獻報道的其他群體進行了比較，探討了不同種族間或民族間的遺傳差異性。
  2. If grazing stress reached a threshold, genetic diversity of population emerged a transition point, with genetic diversity increased

    當放牧壓力達到一個閾值時種群的遺傳多樣性有一個躍變點，遺傳多樣性又有增加的趨勢。
  3. In chapter 4, we study nonlinear theory of the open v - type system with two - color incoherent pump. in this chapter, we discuss the conditions for the onset of lwi and the stability of the system in the limit of strong driving field, and the effect of incoherent pump rate rt on the gain, dispersion and population differences. we also discuss the effect of nonlinearities and the effect of pumping rate threshold of the pumping field

    接著第四章討論雙色非相干泵浦系統的非線性理論，分析了強驅動場情況下的lwi產生的條件和穩定性、非相干泵浦速率r ~ 1對增益、色散和粒子數差的影響；討論了該系統的非線性效應和非線性對非相干泵浦速率r ~ 1與r閾值關系的影響。
  4. Relationship between the population density of schizotetranychus nanjingensis with the bamboo output and the determination of economic threshold

    南京裂爪蟎種群密度與新竹產量的關系及經濟閾值的研究
  5. The results indicate that when the population, economic and urban scales approach or exceed the water resources carrying capacity, or the utilization of water resources approaches or exceeds the threshold of natural water resources, the water resources system significantly slows down the development of socio - economic systems, including the urbanization process

    研究成果指出，當人口、經濟及都市規模接近或超過水資源飽和，又或者都市化水資源接近或超過自然水資源的范圍，水資源系統明顯使社會經濟系統發展緩慢下來? ?也包括都市化的過程。
  6. The analyses given in this paper to quasi - three - level for 946 nm laser are complete. the relation between 946 nm laser transmission and optimal crystal length has been derived from the rate equations describing the population inversion and the photon density in the laser cavity in the steady - state case. the minimal claims to coating have been given on the base of contrasting 946 nm transmission with 1064 nm transmission in the condition of different cavity losses and how the pump beam radius in the laser crystal and optimal crystal length affect the laser threshold and output power of 946 nm laser has been given as well

    對產生946nm譜線的準三能級結構給出了較為完整的分析，利用激光諧振腔處于穩態時的速率方程，導出了準三能級nd ： yag946nm起振時，透射損耗與最佳激光晶體長度的關系，在與1064nm透射損耗相比較的基礎上，給出了不同的腔損耗情況下的最低鍍膜要求，並且給出了激光閾值、輸出功率和最佳激光晶體長度及泵光光斑大小的關系，這為設計室溫下高效運轉的946nm激光器的提供了理論基礎，這種分析方法對研究此類低增益，準三能級或三能級激光系統輸出特性有借鑒意義。
  7. By applying certain threshold levels, 40 countries were identified with the most urgent population problems.

    通過用某些限界標準衡量，四十個國家存在著最緊急的人口問題。
  8. The rate equation formalism is used to develop the concepts of laser threshold, population inversion and modulation response

    比例方程式形式用來生成雷射臨界點、能態數反轉與調變反應的概念。
  9. For sustainable development, the resettlement population cannot make the total population in the host area exceed its population capacity threshold. otherwise, the sustainable development will be harmed

    就可持續發展而言，移民安置不應使安置區的總人口數量超過該區的環境容量「閥值」 ，否則，會危及該區域的可持續發展。
  10. Is made up of alternating constant upward gradients and vertical drops. this form is explained in figure a - 4. as the population increases, the nsapp curve passes the threshold for a gic facility " x " until the dsa is large enough to accommodate the population and the full site area for " x "

    當人口增加時，人均地盤凈面積的曲線便會經過政府、機構或社區設施數值為「 x 」的人口界限，直至地盤發展面積足以容納有關的人口數目及完全符合「 x 」數值設施的地盤面積需求。
  11. The necessary support services and facilities should be put in place even before the new town population has reached the threshold level for such services

    在新市鎮的人口到達規劃中的數量之前，必須要的社區服務及設施應已準備就緒。
  12. Their research showed that when the number of trap cells exceeded a key threshold in the mixtures, the irus population could no longer sustain itself and declined toward extinction

    他們的研究顯示：當誘騙細胞的數量在混合物超過一個關鍵閾值時，病毒群不能再自我維持並趨向滅絕。
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